• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Current converter assembly comprising an input node, a main switch, a control unit configured to control the main switch according to a form factor, an inductance connected in series with the main switch, an output node, a secondary switch serially connected with the main switch and with the inductor, a latch configured to selectively open the secondary switch, and an overcurrent detector configured to set the latch in position to open the secondary switch, when an overcurrent is detected.
    公开号:FR3035281A1
    申请号:FR1600645
    申请日:2016-04-18
    公开日:2016-10-21
    发明作者:Alfons Fisch；Mikhail Zarkhin
    申请人:Continental Automotive Systems Inc；
    IPC主号:
    专利说明:

    [0001] SYNCHRONOUS SPEED CONTROL DEVICE COMPRISING A SHORT CIRCUIT FOR PROTECTION OF THE DOMAIN VOLTAGE SOURCE [0001] This application relates generally to electronic power systems and, more particularly, to current DC converter assemblies. continuous and to processes. TECHNOLOGICAL BACKGROUND [0002] A power supply is integrated into almost any electronic device, both for the consumer and the industrial, including vehicle transmission electronics, portable electronic equipment, vehicle-integrated systems. , computers, medical instrumentation, and many other devices. In an electronic device, it may be necessary to either raise or lower a voltage, using a booster or boost current converter (called a step-down or booster). A boost converter, or booster, may be used to raise the voltage, and a boost converter, or step-down converter, may be used to lower the voltage. [0003] Short circuits of the output voltage node may, however, cause the current converter assembly to not operate properly. This is why the skilled person has implemented short-circuit solutions to the ground. However, under certain conditions, the voltage output node may be short-circuited to a different voltage rail 30, or not be grounded, which is at a voltage higher than the output voltage. and 3035281 2 lower than the input voltage and may nevertheless cause an increase in voltage at the voltage input node. This can damage electronics connected to the voltage input node and / or MOSFETs or other switches used in the converter. Thus, for example, in a step-down synchronous regulator, the level-fixing diode is replaced by a low-side switch whose control is complementary to the high-side switch. Since, unlike the diode, the low side switch, when closed, can conduct current in both directions, it must be protected in the case of an output short circuit to a voltage rail. This type of fault will give a reverse current to the output of the step-down regulator, which is limited only by the DC resistance of the step-down inductor. At a certain point, the overcurrent protection of the low side switch will open it and the current will start to decrease. If this process is repeated all the time, the low side switch together with the inductor, the high side switch body diode and the input capacitor will create an overvoltage topology, which will transfer energy from the exit at the entrance. If the stage of the pre-regulator supplying the step-down sync regulator can only supply current and has insufficient load, the voltage across the input capacitor will increase to higher, possibly unsafe, levels. Therefore, we need an inexpensive solution that can be implemented easily for a set forming a synchronous converter, which is able to effectively protect against a short-circuit to an external voltage source.
    [0002] SUMMARY OF THE INVENTION [0006] A current converter assembly is provided which protects against the fact that the input capacitor accumulates current levels, which are not safe, if the output is short. connected to an external voltage source. [0007] In one embodiment, which may be combined with other forms described herein or which may be distinct from these other forms, there is provided a current converter assembly. The current converter assembly includes an input node, a high side main switch connected in series with the input node, and a pulse width modulation control unit (PWM) connected to the main switch. The PWM control unit is configured to control the main switch according to a form factor calculated by the feedback loop. An inductor is connected in series with the main switch and an output node is connected in series with the inductor. A low side secondary switch is connected in series with the main switch and with the inductor. The secondary switch is grounded to provide a step-down synchronous converter architecture and has a short circuit protection function. A latch is connected to the secondary switch and is configured to selectively open the secondary switch. An overcurrent detector is configured to detect an overcurrent and to set the latch 30 in position to open the secondary switch when an overcurrent is detected. The PWM control unit is configured to provide a PWM control signal to the main switch and the latch, the control signal being configured to reset the latch to the initial state, in order to close the secondary switch, and wherein the latch is configured to remain in position, after being put in position by the overcurrent detector, until the latch 5 receives the control signal from the PWM control unit and is reset, preferably by the control signal. [0008] Preferably, the assembly further comprises an input resistor and capacitor connected to the input node, the resistor and the input capacitor being connected in parallel with each other, each of the resistor and input capacitor being grounded. [0009] Preferably, the assembly further comprises a main diode connected in parallel with the main switch, the main diode being configured as input. In addition, a switch for conducting current to the node. Preferably, the assembly comprises, in a secondary diode connected in parallel with the secondary, the secondary diode being configured to conduct current to the main switch and to the inductance. [0011] Preferably, the assembly further comprises an output capacitor connected to the output node and to the ground. [0012] Preferably, the PWM control unit can operate to send the control signal as an input pulse, the input pulse can operate to close and open the master switch. Preferably, the assembly further comprises a discriminator mounted in series between the PWM control unit and the latch. Preferably, the main switch is a MOSFET and the secondary switch is a MOSFET. [0015] Preferably, the current converter assembly can operate to lower a DC voltage input to the output node, the current converter assembly being operable to output a DC voltage from the node. Release. In another embodiment, which may be combined with the other embodiments provided in the present disclosure or which may be distinct therefrom, there is provided a protection method with respect to a short-term device. circuit to the voltage in a current converter assembly. The method includes detecting an overcurrent by an overcurrent detector, latching a low side switch, if the overcurrent detector detects an overcurrent (using a latch), keeping the low side switch locked until a unit The PWM controller 20 provides a predetermined minimum impulse to the latch and unlocks the low side switch, if a PWM controller provides the minimum impulse determined in advance to the latch. [0017] Preferably, the method further comprises providing a DC current to an input node. [0018] Preferably, the method further comprises making the PWM control unit operate according to a form factor. [0019] Preferably, the method further comprises causing a high side switch to be in series with the input node and with the PWM control unit, the PWM control unit being provided. to operate to control the high side switch following the form factor. Preferably, the method further comprises providing an inductance connected in series with the high side switch and an output node connected in series with the inductor, the method further comprising: so that the low side switch is connected in series with the high side switch and the inductor, the method further comprising having the low side switch connected to the ground and the method comprising furthermore, ensure that the lock is connected to the low side switch. [0021] Preferably, the method further comprises providing an input resistor and capacitor connected to the input node, the method further comprising ensuring that the resistor and the input capacitor are in parallel with each other, the method further comprising connecting each of the resistor and the input capacitor to the ground, the method further comprising providing a high side diode mounted in parallel with the high side switch, the method further comprising causing the high side diode to be configured to conduct current to the input node, the method further comprising providing a low side diode in parallel with the low side switch, the method further comprising causing the low side diode to be configured to conduct current to the high side switch and the inductor and comprising, in addition, to ensure an output capacitor is connected to the output node 30 and ground. Preferably, the method further comprises providing a discriminator mounted in series between the PWM control unit and the latch. In yet another form, which may be combined with the other forms described in the present description or which may be distinct, there is provided a method of protection vis-à-vis a short-circuit to a voltage in a current converter assembly. The method includes the steps of detecting an overcurrent by an overcurrent detector, interlocking a low side switch, if the overcurrent detector detects an overcurrent and holds the low side switch latched during the duration of the short circuit. to the tension. In yet another form, which may be combined with other forms described herein or which may be distinct, there is provided a non-transitory support decipherable by a computer.
    [0003] The computer-readable non-transitory medium provides instructions which, when executed by a computer, cause the computer to perform the following operations of detecting an overcurrent by an overcurrent detector; 20 lock a low side switch by a latch, if the overcurrent detector detects an overcurrent; keep the low side switch locked until a PWM control unit provides a given minimum pulse in advance to the latch and unlock the low side switch, if the PWM control unit provides the minimum pulse determined in advance at the lock. [0025] Preferably, the computer is further configured to perform the following operations: receive a direct current going to an input node, the input node being connected to a high side switch and operate the PWM control unit according to a form factor. These and other features may be better understood by the following description and drawings, the following of which is a brief description.
    [0004] BRIEF DESCRIPTION OF THE DRAWINGS [0027] The following drawings are for illustrative purposes only and are not intended to limit the invention. FIG. 1A is a schematic diagram illustrating components of a current converter assembly according to the principles of the present disclosure; FIG. 1B is a schematic diagram illustrating components of another current converter assembly in accordance with the principles of the present disclosure; FIG. 2 is a block diagram illustrating a method of protecting against a voltage short circuit in a current converter assembly according to the principles of this disclosure and FIG. 3 is a block diagram illustrating an alternative method of protecting against a voltage short circuit in a power converter assembly according to the principles of this disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT [0032] The following description is merely an example and is not intended to limit this disclosure, its applications or uses. Certain terms are used in the following discussion to denote components and particular system configurations. As will be appreciated by those skilled in the art, companies may designate a component by different names. This document does not intend to distinguish between components that differ in name but not in function. In the following discussion, the words "including" and "including" are used in an open manner and should be interpreted to mean "including, but not limited to". Examples of the invention are described below. It will be appreciated that these examples and other examples or embodiments are given by way of example and are intended to illustrate the invention rather than limiting it. Although the invention is widely applicable to different types of systems, it is impossible to include all possible embodiments and possible contexts of the invention in this disclosure. In reading this discussion, many alternative embodiments of the present invention will be apparent to those skilled in the art. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the invention. Referring to FIG. 1, a current converter assembly for lowering a DC voltage is illustrated and is generally designated 10. The current converter assembly 10 is a synchronous regulator. devolator configured to lower the voltage applied to an input of the current converter assembly according to a form factor. When the current converter assembly 10 is operating normally, a dc voltage is applied to the input node 12 of the current converter assembly 10 and is converted into a lower DC voltage, which is provided via output node 14 according to the following equation (in basic form): VaUT = D-Cycle * VIN, where VIN is the input voltage at node 12 input, D-Cycle is the form factor (which is a positive number always less than or equal to 1), and VouT is the voltage supplied by the output node 14. In some applications, a 6V input voltage may be applied to the input node 12 as an example. A capacitor 11 and a resistor 13 are connected to the input node 12 and the capacitor 11 and the resistor 13 are connected in parallel with each other. Each of the resistor 13 and the input capacitor 11 are grounded. An output capacitor 15 may be connected to the output node 14 and to the ground. The current converter assembly 10 comprises a main switch 16, or high-side switch, connected in series with the input node 12. The main switch 16 may be a transistor, such as a MOSFET. The main switch 16 may have a main body diode 17 connected in parallel with the main switch 16. The main body diode 17 is configured to conduct current to the input node 12. A pulse width modulation control unit (PWM) 18 is connected to the main switch 16. The PWM unit 18 is configured to control the closing and opening of the main switch 30 according to a shape factor calculated by a feedback loop. An inductor 20, or an inductor winding, is connected in series with the main switch 16. When the main switch 16 is open, current does not flow from the input node 12 to the inductor 20. But when the main switch 16 is closed, current starts to rise and go to the inductor 20. The inductor 20 will produce a voltage opposite to its terminals in response to the variable current. This voltage drop acts in the opposite direction to the voltage of the source, which reduces the net voltage. Over time, the inductor 20 will store energy in the form of a magnetic field.
    [0005] The inductor 20 is connected in series with the output node 14. A secondary switch 22, or switch on the low side, is connected in series with the main switch 16 and with the inductor 20. As shown, the secondary switch 22 is grounded. The secondary switch 22 may have a secondary body diode 23 connected in parallel with the secondary switch 22. The secondary body diode 23 is configured to conduct current toward the main switch 16 and the inductor 20. When the main switch 16 is open, the secondary switch 22 will normally be closed and vice versa; in other words, the main switch 16 and the secondary switch 22 are out of phase with each other. When the main switch 16 is open, current will continue to flow through inductor 20, into the output node 14, into the payload converter load, and back through the earth and the closed secondary switch 22.
    [0006] The inductor 20 then discharges energy, stored in a magnetic field, into the load at the output. Current can flow in both directions in the secondary switch 22 when closed. Accordingly, in a situation where the output node is short-circuited to a voltage rail, such as, for example, a voltage rail of about 1.2 V or 3.3 V, the energy can be returned from this voltage rail to the input node 12. In such a situation, without the improvements described below, the current converter assembly would become a booster current converter in the opposite direction where a higher voltage would be applied back to the input capacitor 11 and at the input node 12. The current in the input capacitor 11 could rise to unsafe levels and damage the electronics connected to the input node 12. For this reason, when the output node 14 is short-circuited at a voltage that is between the desired input and output voltages (V TT <VsHoRT <VIN), the components of the current converter 10 protect from the situation described above, where components may appear to increase the current to levels that are not safe. A latch 24 is connected to the secondary switch 22 and is configured to selectively open the secondary switch 24. An overcurrent detector 26 is configured to detect an overcurrent from the secondary switch 22 and to set the latch 24 to a position where it opens the secondary switch 22 when an overcurrent is detected. The latch 24 will take precedence over the normally complementary nature of the main switch 16 and the secondary switch 22 because, in an overcurrent situation, both the main switch 16 and the secondary switch 22 may be open. The latch 24 is configured to remain in position during the duration of the voltage short circuit, and thus to maintain the secondary switch 22 locked in the open state. The PWM control unit 18 is configured to supply the PWM control signal to the latch 24 (at the same time as it provides the PWM control signal to the main switch 16). The PWM control signal is configured to reset the latch 24 where it closes the secondary switch 22. The latch 24 is thus configured to remain in a position after being put into this position by the overcurrent detector 26 until the latch 24 receives the control signal from the PWM control unit 18 and is reset. the initial state. But, if the voltage exceeds the desired output voltage, a PWM signal will not be sent by the PWM control unit 18 to the main switch or latch 24. As a result, the latch 24 will not be reset. initial state until the sending of the PWM control signal. For example, when the fault state is removed, the output capacitor 15 will naturally discharge, and at some point in time the output voltage will drop. After the output voltage has dropped, the control loop will resume operation of the main switch 16. At this particular time, the latch 24 will be reset and the secondary switch 22 will then close after the main switch 16 opens again. As a result, the latch 24 will not be reset until it is safe to close the secondary switch 22, which occurs only after the main switch 16 is closed and then opened. Referring now to Figure 1B, a variant of a current converter assembly is illustrated and generally designated 10b. The current converter assembly 10b has components similar to the current converter assembly, such as an input node 12, a resistor 13, an input capacitor 11, a main switch 16, a main body diode 17, an inductor 20, an output node 14, an output capacitor 15, a secondary switch 22, a secondary body diode 23, a latch 24 and an overcurrent detector 26. These components may be the same as described above with respect to Figure 1A. The current converter assembly 10b has a PWM control unit 18b, which is similar to the PWM control unit 18, except that the PWM control unit 18b has a minimum form factor in that it still operates at a minimum form factor of not zero. Therefore, to prevent the latch 24 from being reset by the minimum form factor, a discriminator 28 is connected in series between the PWM control unit 18b and the latch 24. The discriminator 28 prevents the latch 24 from being reset by the minimum form factor. very short pulses associated with the minimum form factor of returning the latch 24 to the initial state. Accordingly, the latch 24 will be reset only when the current converter assembly 10b is operating normally and when there is no short circuit at a voltage not equal to zero. [0049] Referring now to FIG. 2, a method of protecting against a short circuit at a voltage in a power converter assembly is illustrated and generally designated by 100. The method 100 can be used with one of the current converter assemblies 10, 10b illustrated and described above, although the method 100 does not necessarily require the use of the current converter assemblies 10, 10b. The method 100 includes a step 112 of detecting an overcurrent by an overcurrent detector, such as the overcurrent detector 26. The method 100 includes another stage 114 for locking a switch on the low side if the overcurrent detector detects overcurrent by a latch. The latch 24 may be used, for example, to lock the switch 22 on the low side. The method 100 further comprises a step 116 of keeping the switch from the low side to the locked state until a PWM control unit provides a minimum pulse determined in advance to the latch. Finally, the method 100 includes unlocking the downside switch if a PWM control unit provides a minimum pulse determined in advance to the latch. It can be any minimum pulse, as described in FIG. 1A, or a minimum pulse that is greater than the minimum pulse of the PWM control unit, as described with reference to FIG. 1B . The method 100 may include additional steps, such as providing DC power to an input node, as described above. The method 100 may also include making the PWM control unit operable in a form factor. The method may further include mounting a high side switch in series with the input node and with the PWM control unit, the PWM control unit being adapted to operate to control the high side switch according to the form factor. In addition, the method 100 may comprise providing other components, such as those shown and described with reference to Figure 1A. The method 100 may include, for example, providing an inductance connected in series with the high side switch and an output node connected in series with the inductor; providing that the low side switch is serially connected with the high side switch and the inductor; provide for the low side switch to be earthed; and having the latch connected to the low side switch. The method 100 may also include providing an input resistor and capacitor connected to the input node; providing the resistance and the input capacitor as being connected in parallel with each other; connect each of the resistor and the input capacitor to the ground; providing a high side diode mounted in parallel with the high side switch; providing that the high side diode is configured to conduct current to the input node; providing a low side diode mounted in parallel with the low side switch; providing to configure the low side diode to conduct power to the high side switch and the inductor; and providing an output capacitor as connected to the output node and the earth. In some embodiments, the method 100 may also include providing a serial-mounted discriminator between the PWM control unit and the latch. Referring now to FIG. 3, a variant of the method of protecting against a short circuit to the voltage in a current converter assembly is illustrated and generally designated by US Pat. 200. The method 200 includes a step 212 of detecting an overcurrent by an overcurrent detector. The method 200 also includes a stage 214 for locking a downside switch if the overcurrent detector detects overcurrent. The method 200 then comprises a step 216 for holding down the down-side switch for the duration of the voltage short-circuit. This can be done, for example, as described above by returning the latch 24 to the initial state only by a minimum PWM control signal. Other stages of the process 200 may be similar to those described above with respect to method 100 or devices 10, 10b. In some embodiments, a non-transitory and computer-readable medium is used which provides instructions which, when executed by a computer, cause the computer to perform operations. These operations may include the steps of one of the methods 100, 200 such as: detecting an overcurrent by an overcurrent detector; lock a switch on the low side with a latch if the overcurrent detector detects overcurrent; keeping the downside switch 20 locked until a PWM control unit provides a minimum pulse determined in advance to the latch; and unlock the down-side switch if the PWM control unit provides a minimum pulse determined in advance to the latch, for example.
    [0007] The computer may be further configured to perform the operations of receiving DC power at an input node, the input node being connected to a high side switch, and operating the control unit. PWM following a form factor. Although embodiments of this invention have been described, one skilled in the art would recognize that certain modifications would fall within the scope of this invention.
    权利要求:
    Claims (19)
    [0001]
    REVENDICATIONS1. A current converter assembly (10; 10b) comprising: an input node (12); a main switch (16) connected in series with the input node; a pulse width modulation (PWM) control unit (18; 18b) connected to the main switch, the PWM control unit being configured to control the main switch according to a form factor; an inductor (20) connected in series with the main switch (16); An output node (14) connected in series with the inductor; a secondary switch (22) connected in series with the main switch and with the inductor, the secondary switch being earthed; A latch (24) connected to the secondary switch (22) and configured to selectively open the secondary switch and an overcurrent detector (26) configured to detect an overcurrent and to set the latch 25 in position to open the secondary switch, when an overcurrent is detected; wherein the PWM control unit (18; 18b) is configured to provide a PWM control signal to the main switch and the latch, the control signal being configured to reset the latch where it closes. the secondary switch, the latch being configured to remain in position, after being set in position by the overcurrent detector (26), until the latch (24) receives the control signal from the unit ( 18; 18b) PWM and reset by the control signal.
    [0002]
    The current converter assembly of claim 1, further comprising an input resistor and capacitor (11) connected to the input node (12), the resistor and the input capacitor being connected in parallel with each other, each of the resistor and the input capacitor being connected to the ground.
    [0003]
    The current converter assembly of claim 2, further comprising a main diode (17) connected in parallel with the main switch (16), the main diode being configured to conduct current to the node (12) of 'Entrance.
    [0004]
    The current converter assembly according to claim 3, further comprising a secondary diode (23) connected in parallel with the secondary switch, the secondary diode being configured to conduct current to the main switch (16) and to the inductance (20).
    [0005]
    The current converter assembly of claim 4, further comprising an output capacitor (15) coupled to the output node (14) and to ground. 3035281 20 '
    [0006]
    The current converter assembly of claim 5 wherein the PWM control unit (18; 18b) is operable to send the control signal as an input pulse, the input pulse being operate to close and open the main switch (16).
    [0007]
    The current converter assembly of claim 6, further comprising a discriminator (28) connected in series between the PWM control unit and the latch.
    [0008]
    The current converter assembly of claim 6, wherein the main IS switch (16) is a MOSFET and the secondary switch is a MOSFET.
    [0009]
    The current converter assembly of claim 8, wherein the current converter assembly is operable to lower a DC voltage input to the output node, the current converter assembly being operable to operate. output a DC voltage from the output node. 25
    [0010]
    10. A method of short-circuit converting steps of: (100; 200) of one-to-one voltage protection in a current-forming assembly, the method comprising the detection (112; 212) of an overcurrent by an overcurrent detector; locking (114; 214) a low side switch by a latch, if the overcurrent detector detects an overcurrent (116; 216) of the low side switch latched until a PWM control unit provide a predetermined minimum pulse to latch and unlock the low side switch, if the PWM control unit (18; 18b) provides the minimum pulse determined in advance to the latch.
    [0011]
    The method of claim 10, further comprising providing a DC current to an input node (12).
    [0012]
    The method of claim 11, wherein, furthermore, the PWM control unit (18; 18b) operates in a form factor.
    [0013]
    The method of claim 12, wherein, furthermore, a high side switch is in series with the input node (12) and with the PWM control unit (18; PWM control being provided to operate to control the high side switch according to the form factor.
    [0014]
    The method of claim 13, further comprising providing an inductance (20) connected in series with the high side switch and an output node (14) connected in series with the inductor, the method comprising furthermore, providing for the low side switch to be connected in series with the high side switch and the inductor, the method further comprising providing for the low side switch to be earthed and the method further comprising providing that the lock is connected to the low side switch. 3035281 22 '
    [0015]
    The method of claim 14, further comprising providing an input resistor and capacitor (11) connected to the input node, the method further comprising providing the resistor and capacitor. The method further comprises connecting each of the resistor and the input capacitor to the ground, the method further comprising providing a diode 10 on one side. high in parallel with the high side switch, the method further comprising providing the high side diode to be configured to conduct current to the input node, the method further comprising providing a low side diode connected in parallel with the low side switch, the method further comprising providing the low side diode configured to conduct current to the high side switch and inductance (20) and the method further comprising providing an output capacitor connected to the output node and the earth.
    [0016]
    16. The method of claim 15, further comprising providing a discriminator (28) serially connected between the PWM control unit (18; 18b) and the latch (24).
    [0017]
    17. A method of protecting against a short-circuit at a voltage in a current converter assembly, the method comprising the steps of: detecting (112; 212) an overcurrent by an overcurrent detector ; "Latch (114; 214) of a low side switch, if the overcurrent detector detects an overcurrent and hold (116; 216) of the low side switch locked during the duration of the short circuit to the voltage.
    [0018]
    18. Non-transient and computer-readable medium, which provides instructions, which, when executed by a computer, cause the computer to perform operations including: detecting (112; 212) an overcurrent by a overcurrent; lock (114; 214) a low side switch by a latch if the overcurrent detector detects an overcurrent; holding (116; 216) the unlocked low side switch until a PWM control unit provides a given minimum pulse to the lock in advance and unlocking the low side switch, if the unit (18; 18b) PWM provides the minimum pulse determined in advance to the latch (24). 25
    [0019]
    The non-transient and computer-readable medium of claim 18, wherein the computer is further configured to perform the following operations: receive a DC current to an input node (12), the node input connected to a high side switch and operating the PWM control unit (18; 18b) according to a form factor.
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    US9035635B2|2013-03-06|2015-05-19|Microchip Technology Incorporated|Using synchronous converter in asynchronous mode to prevent current reversal during battery charging|US8879283B2|2009-11-05|2014-11-04|On-Bright ElectronicsCo., Ltd.|System and method providing protection in the event of current sensing failure for power converter|
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    WO2021033793A1|2019-08-19|2021-02-25|엘지전자 주식회사|Buck converter and overcurrent protection method therefor|
    法律状态:
    2016-10-21| EXTE| Extension to a french territory|Extension state: PF |
    2017-04-19| PLFP| Fee payment|Year of fee payment: 2 |
    2017-09-29| PLSC| Search report ready|Effective date: 20170929 |
    2018-04-20| PLFP| Fee payment|Year of fee payment: 3 |
    2019-04-18| PLFP| Fee payment|Year of fee payment: 4 |
    2020-04-20| PLFP| Fee payment|Year of fee payment: 5 |
    2021-04-23| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    US14690586|2015-04-20|
    US14/690,586|US10587193B2|2015-04-20|2015-04-20|Synchronous buck regulator with short circuit to voltage source protection|
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