• 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:
    In a static KWh meter, a pulse width-pulse height multiplicator which forms a pulse width-pulse height-modulated signal proportional to the product of measuring signals proportional to voltage and current intensity, said signal being supplied to a voltage/frequency converter (5), from which is obtained a frequency signal (f) proportional to the power and which controls a counting device (7) indicating the energy consumed. The pulse width-pulse height multiplicator has been carried out without any operator amplifiers in that it contains summing members (R1, R2) for adding together a signal (Uu) proportional to the voltage and a triangle wave (Uo), and an analog switch (10) controlled by the summed signal (Uo+Uu) and which takes samples from a signal (Ui) proportional to the current intensity.
    公开号:SU1429948A3
    申请号:SU853882456
    申请日:1985-04-17
    公开日:1988-10-07
    发明作者:Лахти Теуво
    申请人:Валмет Ой (Фирма)；
    IPC主号:
    专利说明:

    (21) 3882456724-21
    (86) PCT / FI 84/00057 (08/17/84)
    (22) 04/17/85
    (31) 832962
    (32) 08/18/83
    (33) FI
    (46) 10/07/88. Bksh. Number 37
    (71) Valmet OY (FI)
    (72) Teuvo Lahti (FI)
    (53) 621.317.385 (088.8)
    (54) STATIC KILOVATT-HOUR COUNTER
    (57) The invention relates to measurement technology and services for improving the reliability of a device. The counter contains 1; t sources and measurement signals, the voltage converter 4, the counter 5, including u: (W step motor 7 and counter 8, and power supply unit 6. To achieve this goal, the pulse-width multiplier 3 consists of a summing element on the resistors, hexerf-sequence of tri-pulse and analog switch on a CMOS transistor 5 or more

    QQ
    9i, 1
    20
    25
    This invention relates to a static kilowatt-hour meter.
    The purpose of the invention is to expand;
    Fig. 1 shows a block diagram of a static kilowatt-hour meter; in fig. 2 shows the basic circuit of the pulse width multiplier in FIG. 3, the waveforms of the pulse width multiplied by the pulse multiplier TeneMj in FIG. 4 and 5 the voltage to frequency converter circuits in Hbix modes of operation. . Static counter contains
    points and 2, -2 measuring signals, proportional to the voltage and current, connected to the wires of the main power grid, pulse-width multiplier 3, whose inputs are connected to the outputs. 1.-1j-H 2 sources, and output with series-connected a voltage-to-frequency converter 4 and a meter 5, as well as a power supply unit 6, the inputs of which are connected to the mains wires and the output .- to the load. Counter 5 contains a stepping motor 7 and a counter 8,
    The pulse multiplier (Fig2) contains a summing element consisting of 11 and one of the first and second resistors 9 and 10, the first terminal of the first resistor 9 is connected to the source 1 of the measuring signals proportional to the voltage, the first 35 output of the second resistor u is connected to the generator 11 is a serial, triangular pulse, and the second terminals of resistors 9 and 10 are combined and connected to the control input of the analog switch (sample) 12, the information input of which is connected to the measuring source 2, the signal ala proportional to current. At the connection point of the summing resistors 9 and 10, the total voltage V-Up is obtained. Sampling switch 12 is an analog switch that receives a signal and. Proportional to the strength of the switch.
    thirty
    40
    45
    .t, r | n
    ka The switch control input is connected to a summing point. The analog switch 12, which can be used, for example, a planar pale-yellow transistor or a MOSFET, changes its state at a predetermined threshold value of the control voltage.
    55

    i
    The threshold level of the analog switch 12 (FIG. 3) in this case determines the duration of the sampling pulses, since the switch is closed when the sum signal U + + Up is above the threshold level and ' and unlocked when the total signal is below the threshold level. Consequently, the output of the sample switch thus controlled is a sequence of square pulses, the duration of which is proportional to the voltage, and the amplitude is proportional to the current. The DC voltage obtained after filtering the pulse train controls the voltage-to-frequency converter 4.
    The voltage-to-frequency converter 4 (Fig. 4) is provided with a bias voltage correction circuit. The voltage to frequency converter contains an operational amplifier 13 connected to a circuit consisting of a capacitor 14 and a resistor 15 serving as an integrating device, a threshold level detector 16 controlling the output signal of the integrating device, and a clock circuit 17 which controls the source 18 dc connected to the output of the integrator. During the operation of the integrated circuit, the device integrates the input current I}. Until the output signal of this device exceeds the threshold level of the detector 16. At this time, the 17 synchronization and ronization circuit starts and switches the current pulse through the switch - IP connection at time T, to the input of the integrator. The operating frequency f of the converter in this case is determined by the formula
     I

    - R Ni
    t.
    i
    Thus, it is clear that the frequency f is directly proportional to the input current 1 | „And therefore input
    voltage.
     W
    because
    and; m Upg R
    where R is the resistance of the resistor 15.
    To correct the effect of the bias voltage U of amplifier 13 on the input current 1, the voltage to frequency converter 4 contains a correction device that during integration maintains a zero level at the output of resistor 15 on the side of amplifier 13 or at point A (Fig. 4) .
    The correcting device contains a sampling switch 19 connecting the integrating device with a multiplier 3, an isolator 20 connected in series with the integrating capacitor 14 and the correcting capacitor 21 between point A and the inverse input of amplifier 13, switch 22, connecting the inverse input and output of amplifier 13 ,. and switch -23, ground point A.
    The switches 19 and 20 allow the input current 1 to be integrated when they are closed in the circuit shown in FIG. 4 position. During the integration process, the switches 22 and 23 open. To perform the integration correction. interrupted between sampling periods of sampling switch 19 by opening switch 20 connected in series with integrating capacitor 14. During the next correction phase, the output and inverting input of amplifier 13 are connected by closing switch 22 and the other end of capacitor 21 is grounded by closing The displacement Uos of the amplifier 13 is transferred to the correction capacitor 21. Thus, during the correction phase, the switches 19, 20, 22, and 23 are controlled so that and appear in the position shown in fig. 5. During the next integration phase.
    five
    0
    five
    0
    five
    0
    five
    the switches are again switched to the position shown in FIG. 4, whereby the correction capacitor 21 is connected to the input circuit so that during the integration phase the voltage at point A remains at zero level, which compensates for the effect of the bias voltage on the input current.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    A static counter, Ki-Shovatt-COB, containing sources of measuring signals and U-5 proportional voltages U, U, U and Ipj, 15, IT connected to the wire. ; backbone power, width-pulse multiplier, the inputs of which are connected to the outputs of the sources of measuring signals, and output with serially connected transducer eg. frequency, made on the analog integrator and analog switches on the CMOS transistors, and the counter, and the power supply unit whose inputs are connected to the power network wires, and the output to the load5 characterized by the fact that The resident contains cy 5-eqp; an element5 consisting of the first and second summing resistors, to the first output of which the source of the measuring signal U ,, is connected, to the first output of the other, a triangle generator is connected x pulses, and the second sum vshody miruyupschh resistors are combined and connected to the control input of analog switch formed on the CMOS transistor kotrogo information input coupled to a source of measuring signal U; ,
    Ui
     and
    Uo
    g AADD vY /
    w
    7
    CpUZ.5
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    同族专利:
    公开号 | 公开日
    EP0152476B1|1988-07-27|
    DK173585A|1985-04-17|
    DK173585D0|1985-04-17|
    US4775834A|1988-10-04|
    EP0152476A1|1985-08-28|
    DE3473044D1|1988-09-01|
    WO1985000893A1|1985-02-28|
    FI67961C|1985-06-10|
    FI67961B|1985-02-28|
    FI832962A|1985-02-19|
    FI832962A0|1983-08-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3794917A|1972-03-09|1974-02-26|Esterline Corp|Electronic watt transducer|
    DE2619734A1|1976-04-30|1977-11-17|Heliowatt Werke|Power supply for electronic recorder electricity meter - has 3 phase rectifiers with 2 protective resistors in series and common charging capacitor|
    JPS581388B2|1978-07-06|1983-01-11|Tokyo Shibaura Electric Co|
    US4217546A|1978-12-11|1980-08-12|General Electric Company|Electronic energy consumption meter and system with automatic error correction|
    US4275349A|1979-05-11|1981-06-23|Westinghouse Electric Corp.|Watt and var transducer|US4926131A|1987-06-25|1990-05-15|Schlumberger Industries, Inc.|Triangle waveform generator for pulse-width amplitude multiplier|
    US4786877A|1987-06-25|1988-11-22|Sangamo-Weston Incorporated|Amplifier for voltage or current to frequency converter|
    US4924412A|1987-06-25|1990-05-08|Schlumberger Industries, Inc.|Integrated poly-phase power meter|
    JP3002310B2|1991-11-21|2000-01-24|株式会社東芝|Watt hour meter|
    JP3234339B2|1993-03-19|2001-12-04|アジレント・テクノロジー株式会社|Power measuring apparatus and method|
    FI100488B|1993-04-16|1997-12-15|Enermet Oy|Measurement coupling for measuring devices intended for energy measurements in three-phase networks|
    FI93279C|1993-09-16|1995-03-10|Enermet Oy|Static kWh meter|
    EP2544025A1|2011-07-07|2013-01-09|FEI Company|Silicon Drift Detector for use in a charged particle apparatus|
    CN110212822B|2019-04-30|2021-03-09|北京云迹科技有限公司|Stepping motor control method and device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI832962A|FI67961C|1983-08-18|1983-08-18|PULSBREDD-PULSHOEJD-MULTIPLIKATOR I EN STATISK KWH-MAETARE|
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