CN211958859U - Power circuit of high-voltage electric energy meter - Google Patents

Power circuit of high-voltage electric energy meter Download PDF

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Publication number
CN211958859U
CN211958859U CN202020915818.7U CN202020915818U CN211958859U CN 211958859 U CN211958859 U CN 211958859U CN 202020915818 U CN202020915818 U CN 202020915818U CN 211958859 U CN211958859 U CN 211958859U
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China
Prior art keywords
power supply
voltage
supply circuit
chip
direct current
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Expired - Fee Related
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CN202020915818.7U
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Chinese (zh)
Inventor
孙艳琴
程鹤鸣
孙艳斌
杨天存
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Huanggang Normal University
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Huanggang Normal University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Direct Current Feeding And Distribution (AREA)

Abstract

The utility model discloses a high-voltage electric energy meter power supply circuit, including rectification filter voltage stabilizing circuit, measurement chip supply circuit, control chip supply circuit, voltage monitoring module, a control switch, stand-by power supply I and stand-by power supply II, rectification filter voltage stabilizing circuit converts the high-tension electricity of getting from high-tension power line into direct current output, measurement chip supply circuit converts the direct current of rectification filter voltage stabilizing circuit output into stable direct current voltage and supplies with electric energy meter measurement chip and use, control chip supply circuit converts the direct current voltage of measurement chip supply circuit output into the required voltage of electric energy meter control chip. When the voltage monitoring module detects that the rectifying, filtering and voltage stabilizing circuit or the metering chip power supply circuit is abnormal, the control switch is enabled to act, and the mode that the standby power supply I supplies power to the control chip and the standby power supply II supplies power to the metering chip is switched. When the voltage monitoring module detects that the power supply circuit of the control chip is abnormal, the control switch is enabled to act, and the mode that the standby power supply I supplies power to the control chip is switched.

Description

Power circuit of high-voltage electric energy meter
Technical Field
The disclosure relates to a power circuit of a high-voltage electric energy meter.
Background
The high-voltage electric energy meter designs the electronic transformer and the electric energy meter into a whole, and the whole electronic circuit is suspended in a high-voltage primary side power supply line, so that the whole metering precision can be effectively improved, and the electric quantity is prevented from being stolen. The working power supply of the electric energy meter is one of the key technologies for ensuring the reliability and the accuracy of the high-voltage electric energy meter. Such as: the technology is mature, a power supply means is carried out by utilizing light energy from a low-voltage side, an auxiliary current transformer is utilized to supplement the power by combining a storage battery or solar energy, uncertain factors are caused due to large actual current fluctuation during working, and the cost is relatively high.
SUMMERY OF THE UTILITY MODEL
At least one embodiment of the present disclosure provides a high voltage electric energy meter power supply circuit. The purposes of taking electricity at high voltage and preventing electric quantity from being stolen are achieved. The power supply circuit obtains electricity from high voltage to be used by different low-voltage metering chips and control chips at the same time, and is used for measuring electrical parameters and reducing cost. And a standby power supply is provided, so that the power supply reliability of the chip is further ensured.
At least one embodiment of the present disclosure provides a power supply circuit of a high-voltage electric energy meter, which includes a rectification filtering voltage stabilizing circuit, a metering chip power supply circuit, a first output end for connecting a metering chip, a control chip power supply circuit, a second output end for connecting a control chip, an overvoltage and undervoltage detection relay, a direct current contactor KM1, a direct current contactor KM2, a standby power supply i and a standby power supply ii; the rectification filtering voltage stabilizing circuit, the metering chip power supply circuit, the normally closed contact KM1-2 of the direct current contactor KM1 and the first output end are sequentially connected, and the first output end, the control chip power supply circuit, the normally closed contact KM2-2 of the direct current contactor KM2 and the second output end are sequentially connected; the input loop of the overvoltage and undervoltage detection relay is connected with the rectification filtering voltage stabilizing circuit, the metering chip power supply circuit and the control chip power supply circuit; the positive electrode of the standby power supply I, the normally open switch K2 of the overvoltage and undervoltage detection relay, the coil of the direct current contactor KM2 and the GND are sequentially connected to form a loop, and the positive electrode of the standby power supply I, the normally open switch K2 of the overvoltage and undervoltage detection relay, the normally open contact KM2-1 of the direct current contactor KM2 and the second output end are sequentially connected; the positive pole of the standby power supply II, the normally open switch K1 of the overvoltage and undervoltage detection relay, the coil of the direct current contactor KM1 and the GND are sequentially connected to form a loop, and the positive pole of the standby power supply II, the normally open switch K1 of the overvoltage and undervoltage detection relay, the normally open contact KM1-1 of the direct current contactor KM1 and the first output end are sequentially connected.
In some examples, the metrology chip power supply circuit includes an LT1074 chip, an input V of the LT1074 chipinA capacitor C1 and an LT1074 chip output end V are connected between the groundswThe normally closed contact KM1-2 of the direct current contactor KM1 is connected through an inductor L1, and the output end VswV of Schottky diodes MBR745 and LT1074 chips is connected between the voltage V and GNDcThe feedback end FB of the LT1074 chip is connected between the resistor R2 and the resistor R3 which are connected in series, and two ends of a series circuit consisting of the resistor R2 and the resistor R3 are respectively connected with the inductor L1 and the GND.
In some examples, the control chip power supply circuit includes an AMS1117 chip.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below.
Fig. 1 is a block diagram of a power circuit of a high-voltage electric energy meter according to an embodiment of the present disclosure.
Fig. 2 is a power circuit topology of a high-voltage electric energy meter according to an embodiment of the present disclosure.
Detailed Description
Fig. 1 is a block diagram of a power circuit of a high-voltage electric energy meter according to an embodiment of the present disclosure. Referring to fig. 1, the power circuit of the high-voltage electric energy meter comprises a rectification filtering voltage stabilizing circuit 1, a metering chip power supply circuit 2, a control chip power supply circuit 3, a voltage monitoring module 4, a control switch 5, a standby power supply I and a standby power supply II. The rectification filtering voltage stabilizing circuit 1, the metering chip power supply circuit 2 and the control chip power supply circuit 3 are connected in sequence. The rectification filtering voltage stabilizing circuit 1 converts high voltage power taken from a high voltage power transmission line into direct current power to be output. The metering chip power supply circuit 2 converts the direct current output by the rectifying, filtering and voltage stabilizing circuit 1 into stable direct current voltage to be supplied to the metering chip of the electric energy meter for use. The control chip power supply circuit 3 converts the direct-current voltage output by the metering chip power supply circuit into the voltage required by the electric energy meter control chip. The voltage monitoring module 4 carries out online detection on three voltages of different grades output by the rectifying, filtering and voltage stabilizing circuit 1, the metering chip power supply circuit 2 and the control chip power supply circuit 3. When the voltage monitoring module 4 detects that the voltage output by the rectifying, filtering and voltage stabilizing circuit 1 or the metering chip power supply circuit 2 is abnormal (the voltage is too high or too low), the control switch 5 is enabled to act, the power supply of the metering chip power supply circuit 2 and the metering chip power supply circuit 3 to the metering chip and the control chip is cut off, the standby power supply I is used for supplying power to the control chip, and the standby power supply II is used for supplying power to the metering chip. When the voltage monitoring module 4 detects that the voltage output by the control chip power supply circuit 3 is abnormal (the voltage is too high or too low), the control switch 5 is actuated to cut off the power supply of the control chip power supply circuit 3 to the control chip, and the standby power supply I is used for supplying power to the control chip.
Fig. 2 is a power circuit topology of a high-voltage electric energy meter according to an embodiment of the present disclosure. As shown in fig. 2, the high voltage is divided by the capacitor and then input to the rectifying circuit. The high voltage may be 10KV taken from the high voltage transmission line, and the voltage input to the rectifying circuit after the capacitive division may be 15V. The rectifying circuit is a bridge rectifying circuit consisting of diodes D1, D2, D3 and D4, wherein D1 and D3 are the same bridge arm, D2 and D4 are the same bridge arm, D1 and D2 are connected in a common cathode mode, and D3 and D4 are connected in a common anode mode. A15V alternating current power supply obtained after the high-voltage side is subjected to voltage division through a capacitor is connected into a rectifier bridge, one end of the 15V alternating current power supply is connected between the anode of D1 and the cathode of D3, and the other end of the 15V alternating current power supply is connected between the anode of D2 and the cathode of D4.
The dc output of the rectifier circuit is filtered and stabilized by a capacitor C1, and then input to a step-down switching regulator LT 1074. The voltage stabilizer LT1047 converts the unstable dc into a stable 5V dc voltage, and supplies the voltage to the professional metering chip ATT7022B which needs 5V voltage. Voltage stabilizationThe output of the LT1074 is subjected to two-stage filtering and voltage stabilization through an inductor L1 and a capacitor C3; meanwhile, the voltage stabilizing diode MBR745 carries out voltage stabilizing protection on the output; the resistor R1 and the capacitor C2 mainly function in absorbing peak voltage, reducing interference and inhibiting circuit oscillation; the resistor R2 and the resistor R3 set resistors for output voltage, and the output voltage VoutThe resistance values of R2 and R3 are related according to the following relation: vout＝VFBX (1+ R2/R3), regulator LT1074 internal reference voltage VFBIs 2.21V; in addition, a feedback voltage is provided to LT1074 via resistor R2 and resistor R3 as the inverting input of its internal error amplifier.
The 5V direct current power supply obtained by the voltage stabilizer LT1074 is used as the input of the forward low dropout voltage stabilizer AMS1117, and C4 and C5 are input capacitors and are used for converting unidirectional pulsating voltage into direct current voltage, and the input is the direct current power supply of 5V, so that the voltage inversion can be prevented after the power failure; c6 and C7 are output filter capacitors and are used for restraining self-oscillation, so that the output of the linear voltage stabilizer is prevented from being an oscillation waveform, and the quality of a power supply is improved. The output voltage of the voltage stabilizer AMS1117 is 3.3V, and is supplied to the electric energy meter control chip MSP430 for use.
In order to prevent failure of high-voltage power taking caused by sudden failure, a standby power supply I, a standby power supply II, a voltage monitoring module (overvoltage and undervoltage detection relay) for switching a power supply mode and a control switch (a direct-current contactor KM1 and a direct-current contactor KM2) are provided. The rectifying and filtering voltage stabilizing circuit, the metering chip power supply circuit, the normally closed contact KM1-2 of the direct current contactor KM1 and the first output end are sequentially connected, and the first output end, the control chip power supply circuit, the normally closed contact KM2-2 of the direct current contactor KM2 and the second output end are sequentially connected. In the electric energy meter, the first output end and the second output end can be wires or wiring terminals and are respectively connected with the metering chip and the control chip. The input loop of the overvoltage and undervoltage detection relay is connected with the rectification filtering voltage stabilizing circuit, the metering chip power supply circuit and the control chip power supply circuit, and whether the voltages of the three parts are abnormal or not is detected. The positive electrode of the standby power supply I, the normally open switch K2 of the overvoltage and undervoltage detection relay, the coil of the direct current contactor KM2 and the GND are sequentially connected to form a loop, and the positive electrode of the standby power supply I, the normally open switch K2 of the overvoltage and undervoltage detection relay, the normally open contact KM2-1 of the direct current contactor KM2 and the second output end are sequentially connected. The positive pole of the standby power supply II, the normally open switch K1 of the overvoltage and undervoltage detection relay, the coil of the direct current contactor KM1 and the GND are sequentially connected to form a loop, and the positive pole of the standby power supply II, the normally open switch K1 of the overvoltage and undervoltage detection relay, the normally open contact KM1-1 of the direct current contactor KM1 and the first output end are sequentially connected.
The over-voltage and under-voltage detection relay can adopt RM35UA12 MW. The overvoltage and undervoltage detection relay performs online detection on three different levels of voltages (15V, 5V and 3.3V) output by the rectification filtering voltage stabilizing circuit, a metering chip power supply circuit taking the voltage stabilizer LT1074 as a core and a control chip power supply circuit taking the voltage stabilizer AMS1117 as a core. When the voltage of the channel a or the channel b is too high or too low, normally open switches K1 and K2 in the detection relay are closed, so that the direct current contactor KM1 and the direct current contactor KM2 coil are electrified, normally open contacts KM1-1 and KM2-1 are closed, normally closed contacts KM1-2 and KM2-2 are disconnected, and the chip power supply is successfully switched into a standby power supply I and a standby power supply II. When the voltage of the channel c is too high or too low, the normally-open switch K2 of the relay is detected to be closed, so that the coil of the direct-current contactor KM2 is electrified, the KM2-1 is closed, the KM2-2 is disconnected, and the power supply is successfully switched into the standby power supply II. When the voltage detected by the voltage detection module returns to normal, normally open switches K1 and K2 in the detection relay are switched from closed to open, so that the direct current contactors KM1 and KM2 lose power, the normally open contacts KM1-1 and KM2-1 are reset to be open, and the normally closed contacts KM1-2 and KM2-2 are reset to be closed. And finally, recovering the working mode of high-voltage electricity taking.
The electric quantity detector 6 carries out the control of electric energy memory space to rated output voltage 5V direct current charging stand-by power supply I and 3.3V direct current charging stand-by power supply II, and stand-by power supply 1 and periodic carry out long-range feedback, remind the staff according to actual conditions, in time change stand-by power supply.

Claims (3)

1. A power supply circuit of a high-voltage electric energy meter is characterized by comprising a rectifying, filtering and voltage-stabilizing circuit, a metering chip power supply circuit, a first output end used for being connected with a metering chip, a control chip power supply circuit, a second output end used for being connected with a control chip, an overvoltage and undervoltage detection relay, a direct-current contactor KM1, a direct-current contactor KM2, a standby power supply I and a standby power supply II; the rectification filtering voltage stabilizing circuit, the metering chip power supply circuit, the normally closed contact KM1-2 of the direct current contactor KM1 and the first output end are sequentially connected, and the first output end, the control chip power supply circuit, the normally closed contact KM2-2 of the direct current contactor KM2 and the second output end are sequentially connected; the input loop of the overvoltage and undervoltage detection relay is connected with the rectification filtering voltage stabilizing circuit, the metering chip power supply circuit and the control chip power supply circuit; the positive electrode of the standby power supply I, the normally open switch K2 of the overvoltage and undervoltage detection relay, the coil of the direct current contactor KM2 and the GND are sequentially connected to form a loop, and the positive electrode of the standby power supply I, the normally open switch K2 of the overvoltage and undervoltage detection relay, the normally open contact KM2-1 of the direct current contactor KM2 and the second output end are sequentially connected; the positive pole of the standby power supply II, the normally open switch K1 of the overvoltage and undervoltage detection relay, the coil of the direct current contactor KM1 and the GND are sequentially connected to form a loop, and the positive pole of the standby power supply II, the normally open switch K1 of the overvoltage and undervoltage detection relay, the normally open contact KM1-1 of the direct current contactor KM1 and the first output end are sequentially connected.
2. The high voltage electric energy meter power supply circuit according to claim 1, characterized in that said metering chip power supply circuit comprises an LT1074 chip, the input terminal V of the LT1074 chipinA capacitor C1 and an LT1074 chip output end V are connected between the groundswThe normally closed contact KM1-2 of the direct current contactor KM1 is connected through an inductor L1, and the output end VswV of Schottky diodes MBR745 and LT1074 chips is connected between the voltage V and GNDcThe feedback end FB of the LT1074 chip is connected between the resistor R2 and the resistor R3 which are connected in series, and two ends of a series circuit consisting of the resistor R2 and the resistor R3 are respectively connected with the inductor L1 and the GND.
3. The high-voltage electric energy meter power supply circuit according to claim 1, characterized in that the control chip power supply circuit comprises an AMS1117 chip.
CN202020915818.7U 2020-05-27 2020-05-27 Power circuit of high-voltage electric energy meter Expired - Fee Related CN211958859U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020915818.7U CN211958859U (en) 2020-05-27 2020-05-27 Power circuit of high-voltage electric energy meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020915818.7U CN211958859U (en) 2020-05-27 2020-05-27 Power circuit of high-voltage electric energy meter

Publications (1)

Publication Number Publication Date
CN211958859U true CN211958859U (en) 2020-11-17

Family

ID=73171639

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020915818.7U Expired - Fee Related CN211958859U (en) 2020-05-27 2020-05-27 Power circuit of high-voltage electric energy meter

Country Status (1)

Country Link
CN (1) CN211958859U (en)

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Granted publication date: 20201117

Termination date: 20210527