WO1995033210A1 - Compteur electrique - Google Patents

Compteur electrique Download PDF

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Publication number
WO1995033210A1
WO1995033210A1 PCT/CN1995/000046 CN9500046W WO9533210A1 WO 1995033210 A1 WO1995033210 A1 WO 1995033210A1 CN 9500046 W CN9500046 W CN 9500046W WO 9533210 A1 WO9533210 A1 WO 9533210A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
pulse
gate
electric energy
modulator
Prior art date
Application number
PCT/CN1995/000046
Other languages
English (en)
Chinese (zh)
Inventor
Min Li
Original Assignee
Min Li
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN 94106068 external-priority patent/CN1112680A/zh
Priority claimed from CN 94119587 external-priority patent/CN1116743A/zh
Application filed by Min Li filed Critical Min Li
Priority to AU25211/95A priority Critical patent/AU2521195A/en
Publication of WO1995033210A1 publication Critical patent/WO1995033210A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique

Definitions

  • the present invention relates to an electric energy metering device; more specifically, the present invention relates to a single-user or multi-user electric energy metering device that uses a pulse electric energy computing device to measure electric energy consumed by a user.
  • the electric energy calculation of the conventional single-user electric energy metering device generally uses an analog multiplier or a digital multiplier. These two kinds of electric energy metering devices have many disadvantages.
  • DT2926979 describes an energy metering device that uses PWM multiplication.
  • the voltage signal is modulated to a high and low level duration (hereinafter referred to as the duration).
  • the difference is proportional to the magnitude of the voltage signal and the current signal. That is, the PWM pulse signal, the current signal is an analog signal, and the product is still an analog signal, which requires a V / F converter to convert to a pulse.
  • the disadvantage is that it contains many analog devices and is easily affected by power, temperature, and the environment. Its operation accuracy depends on Due to factors such as device quality, process, and debugging, the stability and reproducibility are poor, which is not conducive to integration and automation.
  • the electrical energy computing device described in EP0434248 uses SEGMA- DELTA pulses (also essentially PWM pulses) to multiply with multi-bit digital signals, requiring high-precision digital
  • the result is a multi-bit digital signal, and a subsequent wide-bit arithmetic device is required, which is expensive.
  • the electrical energy computing device described in EP0308924 whose voltage signals and current signals are pulse-width modulated and directly operated on digital devices.
  • the disadvantage is that the pulse modulation method is half-wave modulation, and only the half-cycle signals are made during the entire cycle. Modulation, the other half of the period is used as the offset (see Figure 3A, 3B and its description for details), the efficiency is low, the intermediate offset causes the result to introduce a larger fundamental frequency ripple, which is not conducive to accurate and fast measurement
  • a large integral capacity is required to filter out the influence of the fundamental frequency.
  • the sensitivity to the start threshold is not high, the accuracy is low, and it is difficult to accurately calculate the two-way product and its integral.
  • the conventional multi-user energy metering device is a simple combination of single-user energy metering devices, and is commonly installed in a box. There are magnetic couplings between multiple magnetoelectric energy metering devices, which will cause crosstalk. At the same time, there are many consumables, heavy costs, difficult installation, and heavy meter reading tasks;
  • WO94 / 03818 and GB2157448 describe a class of digital A / D-based electrical energy measurement devices that simultaneously sample, hold, convert, and calculate pairs of current and voltage signals, and provide communication and management capabilities through MPU.
  • the disadvantages are high accuracy and high speed.
  • a / D and PU are expensive.
  • most of the current energy meters only accumulate active power, excluding reactive power.
  • the presence of reactive power increases line loss and installation capacity, increases power consumption and cost, and the impact of low power factors of some users is affected by all users. Share.
  • the object of the present invention is to provide a single-user energy metering device, which uses The pulse electric energy computing device realizes unidirectional / bidirectional high-precision electric energy calculation on digital devices by pulsing 4! Voltage signal and current signal.
  • Another object of the present invention is to provide a multi-user electric energy metering device, wherein a plurality of pulse computing devices used by the electric energy metering device share one voltage pulse width modulation.
  • PWM pulse frequency modulation
  • PFM pulse frequency modulation
  • a single-phase single-user energy metering device of the present invention includes: a voltage sensor for converting a load voltage into a corresponding voltage signal, and a current sensor for converting a load current into a corresponding voltage.
  • Current signal an electrical energy calculator, used to multiply and integrate the voltage signal and the current signal to produce a pulse or digital result proportional to the electrical energy corresponding to the load voltage and load current.
  • a microprocessor is used to collect and process , Store and display the electric energy pulse or / and electric digital result, and provide digital adjustment, electronic meter reading, remote measurement and remote control, automatic billing and charging and other management and communication capabilities, a display connected to the MPU for displaying electric energy Value, a power supply device that supplies power to each component and provides backup power for data retention during power failure;
  • the electrical energy computing device includes a voltage pulse modulator for modulating the voltage analog signal into the PWM pulse signal or the PFM pulse signal for full-wave modulation, and a current pulse modulator for converting the current analog signal.
  • the PWM pulse signal or the PFM pulse signal modulated into full-wave modulation is multiplied for the two pulses
  • the signals are multiplied and a pulse signal proportional to the load voltage and the load current is generated.
  • An integrator is used to accumulate the product in one or two-way integration, and is combined with a microprocessor.
  • MPU to provide them with power pulses or / and power digital results.
  • a multi-phase single-user energy metering device of the present invention can use multiple of the single-phase single-user energy metering devices as a single-phase module for each phase, and the pulse output end of the integrator is connected to the main microprocessor through photoelectric isolation.
  • the main microprocessor is used to collect, process, store, display, query the power data provided by the single-phase multi-user power metering module, and provide multi-phase user data reorganization, digital adjustment, electronic meter reading, remote measurement and remote control , Automatic charging and other management and communication capabilities, a display connected to the MPU, used to display the power value, a power supply device, to provide power to each component, and provide backup power for data storage during power failure; each module
  • the microprocessor, display and backup power supply can be omitted, or the microprocessor of one phase module is used as the main processor, and the other is an accessory module.
  • a single-phase multi-user electric energy metering device of the present invention includes a voltage sensor for converting 4 load voltages into corresponding voltage signals. If a thousand current sensors are used, 4 if thousands of corresponding load currents are converted into corresponding voltages. Current signal, a number of electrical energy calculators, used to multiply and integrate the voltage signal and the corresponding current signal to produce a pulse or digital result proportional to the load voltage and the corresponding load current.
  • a micro-processing H (MPU), It is used to collect, process, store, display and query the number of electrical energy pulses and / or electrical energy digital results, and provide digital adjustment, electronic meter reading, remote measurement and remote control, automatic metering.
  • a display connected to the MPU, used to display the power value
  • a keyboard connected to the MPU, used to query the power value
  • a power supply device which supplies power to various components, and provides backup power. Saving of data during power-down; wherein a plurality of pulse operation devices used by the power metering device share a voltage pulse width modulation (PWM) signal or a pulse frequency modulation (PFM) signal.
  • PWM voltage pulse width modulation
  • PFM pulse frequency modulation
  • a multi-phase multi-user power metering device of the present invention can use a plurality of the single-phase multi-user power metering devices as a multi-user module for each phase, and is connected to a main microprocessor through a serial communication port and a photoelectric isolator.
  • the main microprocessor is used to collect, process, store, display, query the power data provided by the single-phase multi-user power metering module, and provide multi-phase user data reorganization, digital adjustment, electronic meter reading, remote measurement and remote control , Automatic billing and charging and other management and communication capabilities, a display connected to the MPU for displaying the power value, a keyboard connected to the MPU for querying the power value, a power supply device to supply power to each component, and provide backup Power supply for saving data during power failure; monitor, keyboard and backup power on each module can be omitted.
  • Figure 1 is a block diagram of a single-phase single-user energy metering device circuit
  • Figure 2 is a circuit diagram of a power calculator using dual PWM pulse modulators
  • Figure 3 is a power calculator using a PWM pulse modulator and a PFM pulse modulator Circuit diagram
  • FIG. 4 is a circuit structure diagram of a bidirectional power calculator
  • Figure 5 is a block diagram of the circuit structure of a multi-phase single-user energy metering device
  • FIG. 6 is a circuit structure diagram of a single-phase multi-user energy measurement device
  • Figure 7 is a block diagram of a multi-phase multi-user circuit
  • 8a-8g are partial waveform diagrams of an electric energy measuring device
  • FIG. 1 is a block diagram of a single-phase single-user power metering device circuit; the figure shows a single-phase single-user power metering device of the present invention, including: a voltage confusion H: 1 for the load voltage conversion to the corresponding Voltage signal, a current sensor 2 for converting a load current into a current signal represented by a corresponding voltage, and an energy calculator 7 for multiplying and integrating a voltage signal and a current signal to generate a voltage proportional to the load voltage and the load current Pulse or digital result of corresponding electric energy, a microprocessor 8 (MPU) with a serial communication port and a display 9 connected to the microprocessor 8 (MPU) for collecting, processing, storing and displaying the electric energy pulse or / and digital result of electric energy , And provide digital adjustment, electronic meter reading, remote measurement and remote control, automatic billing and charging and other management, communication capabilities, a power supply device 10, to provide power to various components, and provide backup power for data retention during power failure;
  • the electric energy computing device therein includes a voltage pulse modulator 3 for modulating the voltage analog signal into the PWM pulse signal or the PFM pulse of full-wave modulation.
  • Signal current pulse modulator 4 for the PWM pulse signal or the PFM pulse signal modulated by the current analog signal to full-wave modulation, and a multiplier 5 for multiplying the two pulse signals and generating a A pulse signal proportional to the load voltage and the load current corresponding energy
  • the integrator 6 is used to accumulate the product of one-way or two-way energy integration, and is connected to a microprocessor (MPU) to provide it with an energy pulse or / And power digital results.
  • MPU microprocessor
  • the electrical energy calculator shown in FIG. 1 is described in detail below with reference to FIG. 2.
  • the electric energy calculator 7 shown in FIG. 2 includes two PWM modulators 13 and 14, which respectively receive a voltage signal and a current signal from a voltage sensor, and 4! It is converted into a factor related to the magnitude of the voltage signal and the current signal.
  • the said PWM pulse signal ; a multiplier 15 formed by an "exclusive OR gate", whose two input ends are used to receive the PWM pulse signals from the two PWM modulators respectively, and generate a voltage corresponding to the load voltage and load.
  • the PWM pulse signal related to the product of the current an integrator 19 composed of a signal converter 16 and two counters 17 and 18; the signal converter receives the PWM pulse signal output from the multiplier, and ⁇ It is converted into a PFM signal of an appropriate format and output to the inputs of two counters 17 and 18, respectively.
  • the counters 17 and 18 accumulate the two-level duration of the PWM pulse signal, respectively, and the result is transmitted through the bus BUS or pulse connected to the MPU. The output is sent to the MPU, and the difference between the two levels is calculated by the MPU to obtain the active energy value.
  • Ep Kp * (Pp + -Pp-) / (Pp ++ Pp-):
  • FIG. 3 is a circuit structure diagram of a power calculator using a PWM pulse modulator and a PFM pulse modulator;
  • the power calculator includes a PWM modulator 19 for receiving a voltage signal from the voltage sensor 1 described in FIG. 1 and a current sensor One of the two current signals is converted into a corresponding P WM pulse signal;
  • the PFM modulator 20 receives the remaining analog signal and converts it into a corresponding PFM pulse signal, where the PFM pulse signal includes A direction signal indicating the positive / negative direction of the input signal and a pulse frequency signal whose pulse density is proportional to the size of the input analog signal;
  • a multiplier 21 composed of an exclusive OR gate is used to receive the direction signal from the PFM pulse modulator 20 and the PWM signal from the PWM PWM pulse signal of modulator 19 Multiply to generate a new direction signal, which together with the pulse frequency signal from the PFM modulator 20 constitutes a new PFM pulse signal that is proportional to the product of the voltage signal and the current signal;
  • Figure 4 is a circuit diagram of a bidirectional electrical energy calculator; the electrical energy calculator includes a
  • the PWM modulator 23 is configured to receive an analog signal from the voltage signal from the voltage sensor 1 and the current signal from the current sensor 2 described in FIG. 1 and convert it into a corresponding PWM pulse signal; a PFM modulator 24 accepts the remaining analog signal and converts it into the corresponding PFM pulse signal, where the PFM pulse signal includes two pulse frequency signals that are proportional to the signal size in both directions; AND gates 27, 28,
  • a multiplier 25 consisting of 29, 30, OR gate 30, 31 and NOT gate 26, said PWM modulator
  • the PWM pulse signal from 23 is connected to each input terminal of AND gates 27 and 30 and NOT gate 26 Input input, the inverting PWM pulse signal output from it is connected to each of the AND gates 28 and 29, and one of the two pulse frequency signals from the PFM pulse modulator 24 'is connected to the AND gates 27 and 29.
  • the other input of the pulse frequency signal is connected to the remaining input terminals of the AND gates 28 and 30.
  • the output terminals of the AND gates 27 and 28 are connected to the two input terminals of the OR gate 31 and the output terminals of the AND gates 29 and 30 respectively.
  • the two OR gates 31, 32 Connected to the two inputs of the OR gate 32, the two OR gates 31, 32 generate a new PFM pulse signal, which is represented by the two pulse frequencies and is proportional to the product of the voltage signal and the current signal; the integrator includes a power direction controller 33 and a positive power counter 42, a zero-crossing counter 43, and a negative power counter 44.
  • the power direction controller 33 receives a PFM pulse signal from the multiplier 25, and filters out high-frequency interference due to modulation to detect the power direction.
  • the counter 43 is sent to the MPU through the bus BUS or / and the pulse output terminal connected to the MPU.
  • the MPU calculates and corrects the positive and negative energy values, multiplies the half value of the corresponding filtering capacity of the energy direction controller by a zero-crossing value, and adds them respectively.
  • Zero-crossing counter other functions or functions of MPU are similar to MPU described in Figure 1;
  • the power direction controller includes two AND gates 34 and 37, two OR gates 35 and 36, a bidirectional reversible counter 38 and an RS flip-flop 41 composed of NOR gates 39 and 40, and an AND gate 34 and an OR gate.
  • Each of the input terminals 35 receives the pulse frequency signal output from the OR gate 31 of the multiplier 25, and the remaining input terminals collectively accept the carry output terminals from the bidirectional reversible count ⁇ 38.
  • the output terminal of the AND gate 34 is connected to the positive direction.
  • the input terminal of the energy counter or the output terminal of the OR gate 35 is connected to the forward counting input terminal of the bidirectional reversible counter.
  • Each of the input terminals of the AND gate 37 and the OR gate 36 jointly receives the pulse frequency signal output from the OR gate 32 of the multiplication 25.
  • the remaining input terminals collectively accept the borrow output from the bidirectional reversible counter 38, the output of the AND gate 37 is connected to the input of the negative energy counter 44, or the output of the OR gate 36 is connected to the negative counting input of the bidirectional reversible counter.
  • the function of the AND gate 34 and the OR gate 35 is to switch the pulse frequency signal input from the OR gate 31 of the multiplier 25 to the two-way reversible counter 3 when the two-way reversible counter 38 has no carry signal.
  • the forward counting input terminal of 8 is used for forward counting. When a carry signal appears, the forward input signal of the bidirectional reversible counter 38 is switched to the input terminal of the forward energy counter 42 and the forward counting value no longer increases;
  • the function of the AND gate 37 and the OR gate 36 is to switch the pulse frequency signal input from the OR gate 32 of the multiplier 25 to the positive counting input terminal of the bidirectional reversible counter 38 when the bidirectional reversible counter 38 has no borrow signal.
  • Count when a borrow signal appears, double
  • the negative input signal of the reversible counter 38 is switched to the input terminal of the negative energy counter ⁇ 44, and the negative count value no longer increases;
  • the two input terminals of the RS flip-flop 41 formed by two NOR gates 3940 are connected respectively.
  • To the carry and borrow output terminals of the bidirectional reversible counter one output terminal of which is connected to the zero-crossing counter;
  • the difference between the carry value and the borrow value of the bidirectional reversible meter 38 in the power direction controller 33 determines the sensitivity of the power direction detection.
  • the larger the difference the greater the power value in the smallest detectable direction.
  • pulse modulation has unavoidable pulse high-frequency disturbance and fundamental frequency leakage, as shown in Figure 8e, f.
  • the difference is less than the disturbance, the disturbance will generate false zero-crossing detection, which also reduces its sensitivity. For this reason, the difference should be appropriate.
  • Alternative but when there is large interference, as shown in Figure 8f, the fundamental frequency disturbance cannot be eliminated.
  • FIG. 5 is a block diagram of a three-phase single-user electric energy metering device; the electric energy metering device includes three modules 45, 46, and 47 of the electric energy calculator 7 described in FIG. 1 for independent measurement and calculation of each phase line
  • the electric energy pulses generated by the two modes of 45 and 46 are connected to MPU7 through opto-isolators 48 and 49.
  • Module 47 is directly connected to PU7 and supplies power to MPU7 and its surrounding systems. The power of the module is combined into a power value, and other functions are the same as those of MPU7 described in FIG. 2.
  • FIG. 6 is a circuit diagram of an embodiment of a multi-user electric energy metering device according to the present invention.
  • the electric energy metering device is used for a single-phase load, and includes a voltage sensor formed by a resistor divider for converting a load voltage into A voltage signal of a lower voltage value proportional to it, a current obfuscator formed by a resistor (1, 2, 3, 4) and an operational amplifier, used for 4 load current conversion into a voltage proportional to it
  • the current signal shown is a triangle wave generator for generating a triangle wave signal.
  • the triangle wave signal is distributed to a plurality of single-user bidirectional energy calculators described in FIG.
  • the triangle wave signal from the triangle wave generator and the current signal from the current sensor are compared, and the current PWM pulse corresponding to the load current described in FIG. 2 is output; the voltage PFM modulator receives the voltage signal from the voltage sensor and generates two respectively proportional Pulse frequency signals with signal magnitudes in both directions.
  • the two pulse frequency signals are distributed to multiple multiplications in a single-user bidirectional energy calculator shown in FIG. 4.
  • the multiplier accepts two pulse frequency signals from a voltage PFM modulator and a current PWM signal from a current PWM modulator, and outputs a PFM signal proportional to the load current and voltage product to the direction control of the electrical energy ⁇ , the output product Filter and output positive energy pulse signal to positive energy counter and negative pulse signal to negative energy count ⁇ , and zero-crossing pulse to zero-crossing counter, each counter counts the energy value and zero-crossing value in two directions respectively, and passes
  • the bus provides power data to the MPU; the MPU accepts the power data of the two-way power calculators, and the MPU is also connected to the display and keyboard, exchanges data with other electronic devices through the serial communication port, and calibrates the zero and gain.
  • the multipliers, power direction controllers, positive and negative energy counters, zero-crossing counters, and MPUs of multiple bidirectional energy calculators can be integrated into the circuit.
  • the electric energy calculator can also be other pulse electric energy calculators, such as the existing voltage PWM modulation signal multiplied by the current analog signal and used as a V / F conversion electric energy calculator.
  • the original voltage PFM The modulator is changed to a voltage PWM modulator, and the voltage PWM signal is distributed to multiple multipliers.
  • the multiplier receives the voltage PWM signal and the corresponding analog voltage signal, and generates an analog signal proportional to the load current and the load current product, which is converted by the V / F converter. It is an electric energy pulse, which is connected to the MPU and its surrounding systems.
  • the MPU and its surrounding systems are the same as above, and will not be described again.
  • the energy calculator can also be another PWM XPWM bidirectional energy calculator shown in Figure 4.
  • PWM XPWM energy calculator is sufficient.
  • the electric energy calculator described in FIG. 2 or FIG. 3 or EP0308924 is not difficult to replace the corresponding voltage pulse modulator, the corresponding current pulse modulator, and the corresponding electric energy calculator with corresponding positions by referring to the above-mentioned energy metering device. It is a single-phase multi-user energy metering device based on unidirectional energy metering.
  • FIG. 7 is a block diagram of a circuit structure of a multi-phase multi-user electric energy metering device.
  • Figure includes multiple The single-phase multi-user energy metering device shown in m 6 is a multi-user module for each phase.
  • the MPU serial communication ports on these modules are optically isolated and connected to the serial bus of the main MPU.
  • the main MPU functions are as shown in Figure 6. In addition to the functions shown, it also includes the function of combining multiple in-phase single-user power data into one multi-phase single-user power data.
  • the power of the main MPU can be an independent power source or the MPU shown in Figure 5 can be taken from one of the phase modules.
  • the module can be directly connected to the optical isolator between the module and the main MPU.
  • the display and backup power on the A and B modules can be omitted.
  • the electric energy metering device of the present invention pulse-modulates voltage and current analog signals, and uses pulse electric energy calculators to perform electric energy calculations on digital devices to directly generate digital information without the need for high-precision A / D and high-speed MPU to achieve high precision.
  • each digital device can be integrated with the MPU in the same digital integrated block, which has high stability, high reliability, and cheaper.
  • the invention has a high-precision bidirectional energy metering device, which further suppresses the current low power factor of each power consumption unit without providing a management basis for compensation. It can encourage users to increase the power factor, ensure the power quality of the power grid, and improve the overall efficiency of the power grid.
  • each current modulator also shares a triangular wave, and each electrical energy calculation ⁇ digital components can be integrated into
  • the users of each phase are based on single-phase multi-users and independently supply power, so that the current sensor can use resistors, and the electrical energy data is concentrated through the MPU of each phase user group.
  • the main MPU exchanges data to further improve security reliability and reduce costs.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Phase Differences (AREA)

Abstract

Un compteur électrique comprend un détecteur de tension, un détecteur de courant, un dispositif fonctionnant à l'énergie électrique, un affichage et une source. Le dispositif fonctionnant à l'énergie électrique comporte un modulateur d'impulsions de tension et un modulateur d'impulsions de courant qui réalisent une modulation onde pleine sur les signaux analogiques provenant des détecteurs de tension et de courant, un multiplicateur et un intégrateur. Plusieurs multiplicateurs peuvent recevoir en commun un signal de sortie d'un modulateur d'impulsions de tension et plusieurs modulateurs d'impulsions de courant peuvent utiliser un générateur de signal triangulaire.
PCT/CN1995/000046 1994-05-26 1995-05-26 Compteur electrique WO1995033210A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU25211/95A AU2521195A (en) 1994-05-26 1995-05-26 Electrical energy meter

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
CN 94106068 CN1112680A (zh) 1994-05-26 1994-05-26 数字运算的集合型电子电度表
CN94106068.3 1994-05-26
CN94106989.3 1994-06-04
CN94106989 1994-06-04
CN94108749 1994-07-26
CN94108749.2 1994-07-26
CN94119587.2 1994-12-19
CN 94119587 CN1116743A (zh) 1994-07-26 1994-12-19 脉冲信号的运算、处理装置

Publications (1)

Publication Number Publication Date
WO1995033210A1 true WO1995033210A1 (fr) 1995-12-07

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PCT/CN1995/000046 WO1995033210A1 (fr) 1994-05-26 1995-05-26 Compteur electrique

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WO (1) WO1995033210A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109086106A (zh) * 2018-06-20 2018-12-25 宁波三星智能电气有限公司 一种配置电能表Code区显示对象的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3648182A (en) * 1969-10-22 1972-03-07 Compteurs Comp D Device for converting two magnitudes into a number of pulses proportional to the integral of their product
US3818340A (en) * 1971-03-26 1974-06-18 Yokogawa Electric Works Ltd Electronic watt-hour meter with digital output representing time-integrated input
DE2926979A1 (de) * 1978-07-06 1980-01-17 Tokyo Shibaura Electric Co Elektronischer wattstundenzaehler
GB2157448A (en) * 1984-04-10 1985-10-23 Yu Chen Watt-hour meter
EP0308924A1 (fr) * 1987-09-24 1989-03-29 Kabushiki Kaisha Toshiba Multiplicateur et compteur des wattheures

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3648182A (en) * 1969-10-22 1972-03-07 Compteurs Comp D Device for converting two magnitudes into a number of pulses proportional to the integral of their product
US3818340A (en) * 1971-03-26 1974-06-18 Yokogawa Electric Works Ltd Electronic watt-hour meter with digital output representing time-integrated input
DE2926979A1 (de) * 1978-07-06 1980-01-17 Tokyo Shibaura Electric Co Elektronischer wattstundenzaehler
GB2157448A (en) * 1984-04-10 1985-10-23 Yu Chen Watt-hour meter
EP0308924A1 (fr) * 1987-09-24 1989-03-29 Kabushiki Kaisha Toshiba Multiplicateur et compteur des wattheures

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109086106A (zh) * 2018-06-20 2018-12-25 宁波三星智能电气有限公司 一种配置电能表Code区显示对象的方法

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