CN212965114U - Power supply circuit of PT mutual inductor of electricity meter - Google Patents
Power supply circuit of PT mutual inductor of electricity meter Download PDFInfo
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- CN212965114U CN212965114U CN202021949100.6U CN202021949100U CN212965114U CN 212965114 U CN212965114 U CN 212965114U CN 202021949100 U CN202021949100 U CN 202021949100U CN 212965114 U CN212965114 U CN 212965114U
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Abstract
The utility model provides an ammeter PT mutual-inductor supply circuit, include: rectifier circuit, voltage protection circuit, filtering energy storage circuit, steady voltage output circuit and warning circuit, rectifier circuit passes through voltage protection circuit is connected to filtering energy storage circuit, filtering energy storage circuit and warning circuit respectively with steady voltage output circuit is connected, warning circuit includes resistance R1, resistance R2, resistance R3, resistance R4 and triode Q1, and the power VCC is connected to through resistance R3 triode Q1's base, resistance R4's one end is connected to triode Q1's base, resistance R4's the other end and triode Q1's emitter ground connection, triode Q1's drain electrode passes through resistance R1 is connected to MCU, triode Q1's drain electrode is connected to the alarm through resistance R2. The utility model discloses can turn into alternating current coupling voltage, can normally measure in order to realize the anti-electricity-theft purpose.
Description
Technical Field
The utility model relates to a mutual-inductor power supply circuit especially relates to an ammeter PT mutual-inductor power supply circuit.
Background
With the development of electronic technology and wireless communication, the current meter reading system depends on wireless remote meter reading, but in the current wireless electric meter system, a good method is not provided for preventing a user from stealing electricity by disconnecting one of a live wire and a zero wire with an electric meter, so that the existing power supply system has certain loopholes and disadvantages.
Disclosure of Invention
The utility model aims to solve the technical problem that a ammeter PT mutual-inductor power supply circuit that can prevent electricity theft needs to be provided.
To this, the utility model provides an ammeter PT mutual-inductor supply circuit, include: rectifier circuit, voltage protection circuit, filtering energy storage circuit, steady voltage output circuit and warning circuit, rectifier circuit passes through voltage protection circuit is connected to filtering energy storage circuit, filtering energy storage circuit and warning circuit respectively with steady voltage output circuit is connected, wherein, warning circuit includes resistance R1, resistance R2, resistance R3, resistance R4 and triode Q1, and the power VCC passes through resistance R3 is connected to triode Q1's base, resistance R4's one end is connected to triode Q1's base, resistance R4's the other end and triode Q1's projecting pole ground connection, triode Q1's drain electrode passes through resistance R1 is connected to the MCU of ammeter, triode Q1's drain electrode passes through resistance R2 is connected to the alarm.
The utility model discloses a further improvement lies in, rectifier circuit includes diode D1, diode D2, diode D3 and diode D4, diode D1's positive pole and diode D3's positive pole ground connection, diode D1's negative pole is connected to respectively diode D2's positive pole and PT mutual-inductor's an output pin, diode D3's negative pole is connected to respectively diode D4's positive pole and another output pin of PT mutual-inductor, diode D2's negative pole and diode D4's negative pole all are connected to the voltage protection circuit.
The utility model discloses a further improvement lies in, voltage protection circuit includes zener diode D5, diode D2's negative pole and diode D4's negative pole all are connected to zener diode D5's negative pole, zener diode D5's positive pole ground connection.
The utility model discloses a further improvement lies in, filtering energy storage circuit includes electrolytic capacitor EC1, electric capacity C1 and electric capacity C2, electrolytic capacitor EC 1's positive pole, electric capacity C1's one end and electric capacity C2's one end are connected to zener diode D5's negative pole, electrolytic capacitor EC 1's negative pole, electric capacity C1's the other end and electric capacity C2's the other end ground connection.
The utility model discloses a further improvement lies in, steady voltage output circuit includes steady voltage chip U1, electric capacity C3 and electric capacity C4, steady voltage chip U1's voltage input end is connected to zener diode D5's negative pole, steady voltage chip U1's voltage output end respectively with electric capacity C3's one end, electric capacity C4's one end and power VCC are connected, electric capacity C3's the other end and electric capacity C4's other end ground connection.
The utility model discloses a further improvement lies in, the alarm includes in LED lamp, bee calling organ and the vibrator arbitrary one.
The utility model discloses a further improvement lies in, still includes storage module, storage module with the MCU of ammeter is connected.
Compared with the prior art, the beneficial effects of the utility model reside in that: can turn into the voltage with alternating current coupling through relevant circuit design, and then supply power for PT mutual-inductor place system in order to guarantee its work, can realize normal measurement in order to realize the purpose of anti-electricity-theft, on this basis, when appearing unusually, can also realize reporting to the police through alarm circuit to can further realize stealing electric incident record, so that follow-up investigation later.
Drawings
Fig. 1 is a schematic block circuit diagram of an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an alarm circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, the present example provides a power supply circuit for a PT transformer of an electric meter, including: the power supply comprises a rectifying circuit 1, a voltage protection circuit 2, a filtering energy storage circuit 3, a voltage stabilization output circuit 4 and an alarm circuit 5, wherein the rectifying circuit 1 is connected to the filtering energy storage circuit 3 through the voltage protection circuit 2, and the filtering energy storage circuit 3 and the alarm circuit 5 are respectively connected with the voltage stabilization output circuit 4, as shown in fig. 2, the alarm circuit 5 comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a triode Q1, a power supply VCC is connected to a base of the triode Q1 through the resistor R3, one end of the resistor R4 is connected to a base of the triode Q1, the other end of the resistor R4 is grounded to an emitter of the triode Q1, a drain 1 of the triode Q25 is connected to an MCU of an electric meter through the resistor R1, and a drain alarm of the triode Q1 is connected to the resistor R2.
In order to prevent the situation that a user steals electricity by not connecting one of the live wire or the zero wire with an ammeter, a power supply circuit of the PT mutual inductor is designed, namely when one of the live wire or the zero wire is not connected with the ammeter, the ammeter can not normally work due to no power supply, but current passes through, the PT mutual inductor can be coupled with the current to generate voltage, power is supplied to a system where the PT mutual inductor is located so as to ensure that the system can still normally measure the work, and on the basis, a storage module 6 can be additionally arranged to record electricity stealing events so as to facilitate the checking of a power supply office.
In the Alarm circuit 5 of this example, when the power VCC has a voltage, that is, when the voltage is supplied to the circuit where the PT transformer is located, the triode Q1 is turned on, and at this time, an Alarm signal (Alarm signal) of the MCU connected to the electric meter/system changes from a high level to a low level, and the MCU can recognize and make an Alarm and/or event record; when the power supply VCC has no voltage, the Alarm signal (Alarm signal) is a continuous high level, and the MCU determines that the state is normal.
As shown in fig. 3, the rectifier circuit 1 of this example is used for rectifying ac power coupled thereto, and includes a diode D1, a diode D2, a diode D3, and a diode D4, an anode of the diode D1 and an anode of the diode D3 are grounded, a cathode of the diode D1 is respectively connected to the anode of the diode D2 and one output pin of the PT transformer, a cathode of the diode D3 is respectively connected to the anode of the diode D4 and the other output pin of the PT transformer, and a cathode of the diode D2 and a cathode of the diode D4 are both connected to the voltage protection circuit 2. In fig. 3, PT refers to a PT transformer, also called a voltage transformer.
As shown in fig. 3, the voltage protection circuit 2 of this embodiment maintains the rectified voltage at a substantially constant voltage value, and performs a constant voltage regulation function; the voltage stabilizing diode D5 is included, the cathode of the diode D2 and the cathode of the diode D4 are both connected to the cathode of the voltage stabilizing diode D5, and the anode of the voltage stabilizing diode D5 is grounded.
As shown in fig. 3, the filter energy storage circuit 3 has energy storage and filtering functions, and includes an electrolytic capacitor EC1, a capacitor C1 and a capacitor C2, wherein the anode of the electrolytic capacitor EC1, one end of the capacitor C1 and one end of the capacitor C2 are connected to the cathode of the zener diode D5, and the cathode of the electrolytic capacitor EC1, the other end of the capacitor C1 and the other end of the capacitor C2 are grounded.
As shown in fig. 3, the voltage stabilizing output circuit 4 of this embodiment can stabilize the voltage to obtain the required voltage value by selecting a suitable voltage stabilizing chip, and includes a voltage stabilizing chip U1, a capacitor C3 and a capacitor C4, a voltage input terminal of the voltage stabilizing chip U1 is connected to a cathode of the voltage stabilizing diode D5, a voltage output terminal of the voltage stabilizing chip U1 is respectively connected to one end of the capacitor C3, one end of the capacitor C4 and the power VCC, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded.
The alarm comprises any one of an LED lamp, a buzzer and a vibrator, and other alarm modes can be adopted; the electric meter also comprises a storage module 6, wherein the storage module 6 is connected with the MCU of the electric meter, the storage module 6 can be a memory on the market and used for storing electricity stealing events and the like, and can also be realized by adopting an autonomously designed storage circuit.
In conclusion, the alternating current can be coupled and converted into voltage through related circuit design, power is supplied to a system where the PT mutual inductor is located so as to guarantee the PT mutual inductor to work, isolation reliability is high, normal metering can be achieved so as to achieve the purpose of electricity stealing prevention, on the basis, when abnormality occurs, alarming can be achieved through the alarming circuit 5, and electricity stealing event recording can be further achieved so as to facilitate follow-up verification, the whole scheme is simple, cost is low, and working efficiency is high.
The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.
Claims (7)
1. An electricity meter PT transformer power supply circuit, comprising: rectifier circuit, voltage protection circuit, filtering energy storage circuit, steady voltage output circuit and warning circuit, rectifier circuit passes through voltage protection circuit is connected to filtering energy storage circuit, filtering energy storage circuit and warning circuit respectively with steady voltage output circuit is connected, wherein, warning circuit includes resistance R1, resistance R2, resistance R3, resistance R4 and triode Q1, and the power VCC passes through resistance R3 is connected to triode Q1's base, resistance R4's one end is connected to triode Q1's base, resistance R4's the other end and triode Q1's projecting pole ground connection, triode Q1's drain electrode passes through resistance R1 is connected to the MCU of ammeter, triode Q1's drain electrode passes through resistance R2 is connected to the alarm.
2. The power supply circuit of the PT transformer of an electric meter according to claim 1, characterized in that said rectifying circuit comprises a diode D1, a diode D2, a diode D3 and a diode D4, the anode of said diode D1 and the anode of said diode D3 are grounded, the cathode of said diode D1 is respectively connected to the anode of said diode D2 and one output pin of the PT transformer, the cathode of said diode D3 is respectively connected to the anode of said diode D4 and the other output pin of said PT transformer, and the cathode of said diode D2 and the cathode of said diode D4 are both connected to said voltage protection circuit.
3. An electricity meter PT transformer supply circuit as claimed in claim 2, wherein said voltage protection circuit includes a zener diode D5, the cathode of said diode D2 and the cathode of diode D4 are both connected to the cathode of said zener diode D5, and the anode of said zener diode D5 is connected to ground.
4. The power supply circuit of the PT transformer of the electric meter according to claim 3, characterized in that the filtering and energy storage circuit comprises an electrolytic capacitor EC1, a capacitor C1 and a capacitor C2, wherein the anode of the electrolytic capacitor EC1, one end of the capacitor C1 and one end of the capacitor C2 are connected to the cathode of the zener diode D5, and the cathode of the electrolytic capacitor EC1, the other end of the capacitor C1 and the other end of the capacitor C2 are grounded.
5. The power supply circuit of the PT transformer of the ammeter of claim 3, wherein the voltage stabilizing output circuit comprises a voltage stabilizing chip U1, a capacitor C3 and a capacitor C4, a voltage input end of the voltage stabilizing chip U1 is connected to a cathode of the voltage stabilizing diode D5, a voltage output end of the voltage stabilizing chip U1 is respectively connected with one end of the capacitor C3, one end of the capacitor C4 and a power supply VCC, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded.
6. An electricity meter PT transformer supply circuit as claimed in any one of claims 1 to 5, wherein the alarm includes any one of an LED light, a buzzer and a vibrator.
7. An electricity meter PT transformer supply circuit as claimed in any one of claims 1 to 5 further including a memory module connected to the MCU of the electricity meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021949100.6U CN212965114U (en) | 2020-09-08 | 2020-09-08 | Power supply circuit of PT mutual inductor of electricity meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021949100.6U CN212965114U (en) | 2020-09-08 | 2020-09-08 | Power supply circuit of PT mutual inductor of electricity meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212965114U true CN212965114U (en) | 2021-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021949100.6U Active CN212965114U (en) | 2020-09-08 | 2020-09-08 | Power supply circuit of PT mutual inductor of electricity meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212965114U (en) |
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2020
- 2020-09-08 CN CN202021949100.6U patent/CN212965114U/en active Active
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