CN104655895A - Micro-current inquiry power supply energy-saving protection system for watt-hour meter - Google Patents

Abstract

The power supply energy-saving protection system for micro-current inquiry of the watt-hour meter relates to the field of electric power. It includes a power supply identification system. The power supply identification system includes a relay or a thyristor. An electric signal frequency generating mechanism and an electric signal frequency receiving mechanism matched with the electric signal frequency generating mechanism, the electric signal frequency generating mechanism is connected to the positive power supply terminal of the watt-hour meter, and the electric signal frequency receiving mechanism is connected to the watt-hour meter Negative power supply access terminal; the power supply identification system also includes a signal processing system, the signal input terminal of the signal processing system is connected to the electrical signal frequency receiving mechanism, and a control signal output terminal of the signal processing system is connected to a relay or a thyristor. In the present invention, when the signal received by the electric signal frequency receiving mechanism does not meet the frequency requirement or the signal cannot be received, the signal processing system keeps the power supply line in a disconnected state.

Description

Watt-hour meter micro-current inquiry power supply energy-saving protection system

technical field

The invention relates to the field of electric power, in particular to a power control system.

Background technique

A large number of metal wires are often connected behind the watt-hour meter, and these metal wires provide a large number of free electrons, resulting in power loss. Therefore, we will see that even if all the electrical appliances in the house are turned off, the watt-hour meter still moves. It can be seen that the energy consumption caused by these metal wires is very large.

When the original watt-hour meter is used for power supply, it is impossible to distinguish whether it is power supply for the equipment used, leakage of electricity, or someone gets an electric shock. Therefore, it is impossible to actively prevent electric leakage and electric shock. If the power system can actively identify and prevent leakage and electric shock, hundreds of millions of economic losses can be avoided.

Contents of the invention

The object of the present invention is to provide an energy-saving protection system for electricity meter micro-current inquiry power supply, so as to solve the above-mentioned problems.

The technical problem solved by the present invention can adopt following technical scheme to realize:

The electricity meter micro-current inquiry power supply energy-saving protection system is characterized in that it includes a power supply identification system, and the power supply identification system includes a relay or a thyristor, and the relay or thyristor is connected to the positive power supply terminal of the electricity meter;

The power supply identification system also includes an electrical signal frequency generating mechanism and an electrical signal frequency receiving mechanism matched with the electrical signal frequency generating mechanism, the electrical signal frequency generating mechanism is connected to the positive power supply terminal of the watt-hour meter, The electrical signal frequency receiving mechanism is connected to the negative power supply terminal of the watt-hour meter;

The power supply identification system further includes a signal processing system, the signal input end of the signal processing system is connected to the electrical signal frequency receiving mechanism, and a control signal output end of the signal processing system is connected to the relay or thyristor.

In the present invention, when the electrical signal frequency receiving mechanism receives a signal meeting the frequency requirement, the signal processing system controls the relay or the thyristor to be in the conduction state, so that the power supply line is in the conduction state. When the signal received by the electrical signal frequency receiving mechanism does not meet the frequency requirements or the signal cannot be received, the signal processing system controls the relay or thyristor to be in the disconnected state, thereby cutting off the positive power supply terminal of the watt-hour meter, so that The power supply line is disconnected.

The signal processing system considers that the signal with the same frequency as the signal sent by the electrical signal frequency generating mechanism is a signal that meets the frequency requirement. When supplying power to electrical equipment, the positive power supply input terminal of the watt-hour meter and the negative power supply terminal of the watt-hour meter are connected, and the electrical signal frequency receiving mechanism receives the signal sent by the electrical signal frequency generating mechanism, so The signal processing system controls the relay or the thyristor to be in a conduction state, so that the power supply line is in a conduction state.

When leakage or electric shock occurs, the electrical signal frequency receiving mechanism cannot receive the signal sent by the electrical signal frequency generating mechanism, and the electrical signal frequency generating mechanism controls the relay or thyristor to be in a non-conducting state, so that the The power supply line is disconnected.

The generating frequency of the electrical signal frequency generating mechanism is less than 5 Hz. to reduce costs. The power supply identification system is connected to the mains through a transformer. for electrical isolation.

The energy-saving protection system for micro-current inquiry power supply of the watt-hour meter also includes a key switch, and the key switch is connected to the signal processing system. The control level of the key switch is higher than that of the electric signal frequency receiving mechanism, and the electric signal frequency receiving mechanism can be cut off on the premise that the electric signal frequency receiving mechanism receives the electric signal.

The micro-current inquiry power supply energy-saving protection system of the watt-hour meter also includes a load current regulation system, the load current regulation system includes a control module, the control module is provided with a control signal output terminal, and the control module passes the control signal output terminal connected to a voltage adjustment unit, the signal output end of the voltage adjustment unit is connected to a signal processing module for current control;

The power supply line is provided with a constant current output circuit, the current control signal processing module receives the adjustment signal of the voltage adjustment unit, and after analyzing and processing the adjustment signal, outputs it to the constant current output circuit to realize the constant current Adjustment of the output current of the output circuit.

The signal processing module for current control is connected to the signal processing system, and the signal processing system is connected to a host computer through the electrical signal frequency generating mechanism for communication. to provide the basis for uploading data.

The control module is also provided with a control signal input terminal, and the control signal input terminal is connected to the signal processing system;

The upper computer is provided with a static database for current adjustment that contains the output value of the constant current output circuit that matches the control signal of the voltage adjustment unit. The upper computer judges the output value of the constant current output circuit that needs to be adjusted, and searches for a matching The control signal is transmitted to the control module through the signal processing system, and then output to the voltage adjustment unit by the control module, so as to realize the adjustment of the output current of the constant current output circuit.

Also be provided with a dynamic database in the described upper computer, described upper computer records the input signal of the outside world, and stores in dynamic database, and dynamic database is expanded during use, constitutes a dynamic database with self-learning mode; The upper computer judges the output value of the constant current output circuit that needs to be adjusted, and outputs the control signal according to the value that matches the output value of the constant current output circuit obtained in the dynamic database and the control signal of the voltage adjustment unit, through the signal processing system The control signal is transmitted to the control module, and then output to the voltage adjustment unit by the control module, so as to realize the adjustment of the output current of the constant current output circuit.

The signal processing module for current control may use signal processing methods such as short-circuit output, filtering, signal limiting, and signal conversion to process the adjustment signal. In order to eliminate interference and signal shaping. The adjustment signal here may be in the form of electrical signals such as voltage, current, PWM, and frequency.

The voltage adjustment unit receives the control signal output by the control module, and adjusts between the terminal AH (the highest value of the adjustment signal) and the terminal AW (the adjustment signal) and between the terminal AW (the adjustment signal) and AL (the lowest value of the adjustment signal). The equivalent resistance value between the terminals realizes the control of the adjustment signal output to the current control signal processing module. The adjustment signal here may be in the form of electrical signals such as voltage, current, PWM, and frequency.

Between the AH terminal and the AW terminal and between the AW terminal and the AL terminal of the voltage adjustment unit is a circuit or chip equivalent to a resistor, and the equivalent resistance value is adjusted according to the output signal of the control module.

It also includes a reference voltage module, the ORV+ (maximum output voltage) terminal and ORV- (minimum output voltage) terminal of the reference voltage module are respectively connected to the AH terminal and AL terminal of the voltage adjustment unit, so as to control the voltage Adjust the output signal of the module within the set range. A reference voltage is generated according to the requirements of the adjustment signal output by the current control signal processing module.

A divider resistor is also connected between the AH terminal of the voltage adjustment unit and the ORV+ terminal of the reference voltage module, and another divider is connected between the AL terminal of the voltage adjustment unit and the ORV- terminal of the reference voltage module. The two voltage dividing resistors form a voltage dividing circuit with the AH terminal, AL terminal and AW terminal of the voltage adjustment unit. The voltage output by the reference voltage module is divided by the voltage divider circuit, and an adjustment signal is output to the current control signal processing module to determine that the output signal of the current control signal processing module is within the set range . Here, the output adjustment signal is in the form of voltage, PWM and other signals.

The adjustment signal output by the voltage adjustment unit can also be controlled by the control signal output by the control module.

The control module is connected to at least two of the voltage adjustment units, and at least two of the voltage adjustment units are respectively connected to a signal processing module for current control, and are respectively connected to the constant current output circuit through the signal processing modules for current control; It also includes at least two reference voltage modules, and voltage dividing resistors are respectively arranged between the at least two reference voltage modules and the voltage adjustment unit. Realize one control module to control two constant current output circuits.

The control module adopts an intelligent unit such as an MCU (microcontroller), and may also be an interface circuit capable of adjusting a working state such as a digital logic circuit, a switch circuit, and an analog adjustment circuit.

The signal processing module for current control and the constant current output circuit can respectively receive the electrical signal output by the control module, and adjust their working states according to the electrical signal output by the control module.

Description of drawings

Fig. 1 is a circuit block diagram of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific diagrams.

The micro-current query power supply energy-saving protection system of the watt-hour meter includes a power supply identification system. The power supply identification system includes a relay or thyristor 11, and the relay or thyristor 11 is connected to the positive power supply terminal of the watt-hour meter; the power supply identification system also includes a power supply. Signal frequency generating mechanism 9 and an electrical signal frequency receiving mechanism 12 supporting the electrical signal frequency generating mechanism 9, the electrical signal frequency generating mechanism 9 is connected to the negative power supply terminal of the watt-hour meter, and the electrical signal frequency receiving mechanism 12 is connected to the power supply. The positive power supply access end of the meter, the power supply identification system also includes a signal processing system 13, the signal input end of the signal processing system 13 is connected to the electrical signal frequency receiving mechanism 12, and a control signal output end of the signal processing system 13 is connected to a relay or a thyristor 11. In the present invention, when the electrical signal frequency receiving mechanism 12 receives a signal that meets the frequency requirement, the signal processing system 13 controls the relay or the thyristor 11 to be in the conduction state, so that the power supply line is in the conduction state. When the signal received by the electrical signal frequency receiving mechanism 12 does not meet the frequency requirements or the signal cannot be received, the signal processing system 13 controls the relay or the thyristor 11 to be in the disconnected state, thereby cutting off the positive power supply terminal of the watt-hour meter and making the power supply The line is disconnected.

The signal processing system 13 considers that the signal with the same frequency as the signal sent by the electrical signal frequency generating mechanism 9 is a signal meeting the frequency requirement. When supplying power to the electrical equipment 8, the positive power supply input terminal of the watt-hour meter and the negative power supply connection terminal of the watt-hour meter are connected, and the electric signal frequency receiving mechanism 12 receives the signal sent by the electric signal frequency generating mechanism 9, and the signal is processed The system 13 controls the relay or the thyristor 11 to be in the conduction state, so that the power supply line is in the conduction state. When leakage or electric shock occurs, the electrical signal frequency receiving mechanism 12 cannot receive the signal sent by the electrical signal frequency generating mechanism 9, and the electrical signal frequency generating mechanism 9 controls the relay or thyristor 11 to be in a non-conducting state, thereby making the power supply line in a disconnected state .

The generation frequency of the electrical signal frequency generating mechanism 9 is less than 5 Hz. to reduce costs.

The power meter micro-current inquiry power supply energy-saving protection system also includes a key switch 10, and the key switch is connected to the signal processing system. The control level of the key switch is higher than that of the electric signal frequency receiving mechanism, and the electric signal frequency receiving mechanism can be cut off on the premise that the electric signal frequency receiving mechanism receives the electric signal.

The micro-current inquiry power supply energy-saving protection system of the watt-hour meter also includes a load current regulation system. The load current regulation system includes a control module 6. The control module 6 is provided with a control signal output terminal. The control module 6 is connected to a voltage through the control signal output terminal. The adjustment unit 2 and the signal output end of the voltage adjustment unit 2 are connected to a signal processing module 5 for current control. The power supply line is provided with a constant current output circuit 7, and the current control signal processing module 5 receives the adjustment signal of the voltage adjustment unit 2, and after analyzing and processing the adjustment signal, outputs it to the constant current output circuit 7 to realize the output of the constant current output circuit 7 current regulation. The present invention can adjust the output current to meet the power supply requirements of multiple brands and multiple models of electrical equipment 8 . The signal processing module 5 for current control is connected to a signal processing system 13 , and the signal processing system 13 is connected to a host computer via the electrical signal frequency generating mechanism 9 . During the power supply process, the signal processing system 13 uploads the current parameters, power supply time, electric equipment model, and vehicle owner information to the host computer.

The control module 6 is also provided with a control signal input terminal, and the control signal input terminal is connected to the signal processing system 13; the host computer is provided with a static control circuit for current regulation that matches the output value of the constant current output circuit 7 with the control signal of the voltage adjustment unit 2. The database, the host computer judges the output value of the constant current output circuit 7 that needs to be adjusted, searches for a matching control signal, and transmits the control signal to the control module 6 through the signal processing system 13, and then the control module 6 outputs it to the voltage adjustment unit 2, The adjustment of the output current of the constant current output circuit 7 is realized.

There is also a dynamic database in the upper computer. The upper computer records the input signals from the outside and stores them in the dynamic database. The dynamic database can be expanded during use to form a dynamic database with self-learning mode; the upper computer judges what needs to be adjusted. The output value of the constant current output circuit 7 is based on the value that matches the output value of the constant current output circuit 7 obtained in the dynamic database and the control signal of the voltage adjustment unit 2 to output a control signal, and the control signal is transmitted through the signal processing system 13 to the control module 6, and then the control module 6 outputs to the voltage adjustment unit 2 to realize the adjustment of the output current of the constant current output circuit 7.

The signal processing module 5 for current control may use signal processing methods such as short-circuit output, filtering, signal limiting, and signal conversion to process the adjustment signal. In order to eliminate interference and signal shaping. The adjustment signal here may be in the form of electrical signals such as voltage, current, PWM, and frequency. The voltage adjustment unit 2 receives the control signal output by the control module 6, and adjusts the voltage between the AH (the highest value of the adjustment signal) terminal and the AW (the adjustment signal) terminal and between the AW (the adjustment signal) terminal and the AL (the lowest value of the adjustment signal) terminal. The equivalent resistance value between them realizes the control of the adjustment signal output to the signal processing module 5 for current control. The adjustment signal here may be in the form of electrical signals such as voltage, current, PWM, and frequency. Between the AH terminal and the AW terminal and between the AW terminal and the AL terminal of the voltage adjustment unit 2 are circuits or chips equivalent to resistors, and the equivalent resistance value is adjusted according to the output signal of the control module 6 . It also includes a reference voltage module 1, the ORV+ (maximum output voltage) terminal and ORV- (minimum output voltage) terminal of the reference voltage module 1 are respectively connected to the AH terminal and AL terminal of the voltage adjustment unit 2, so as to control the voltage adjustment module. The output signal is within the set range. The reference voltage is generated according to the requirements of the adjustment signal output by the signal processing module 5 for current control. A voltage divider resistor 3 is also connected between the AH terminal of the voltage adjustment unit 2 and the ORV+ terminal of the reference voltage module 1, and another voltage divider resistor 4 is connected between the AL terminal of the voltage adjustment unit 2 and the ORV- terminal of the reference voltage module 1 , the two voltage dividing resistors and the AH terminal, AL terminal and AW terminal of the voltage adjustment unit 2 form a voltage dividing circuit. The voltage output by the reference voltage module 1 is divided by the voltage divider circuit, and an adjustment signal is output to the current control signal processing module 5 to ensure that the output signal of the current control signal processing module 5 is within the set range. Here, the output adjustment signal is in the form of voltage, PWM and other signals. The adjustment signal output by the voltage adjustment unit 2 can also be controlled by the control signal output by the control module 6 .

The control module 6 is connected to at least two voltage adjustment units 2, at least two voltage adjustment units 2 are respectively connected to a current control signal processing module 5, and the current control signal processing module 5 is respectively connected to the constant current output circuit 7; it also includes at least two There are three reference voltage modules 1, and at least two reference voltage modules 1 and the voltage adjustment unit 2 are respectively provided with voltage dividing resistors. One control module 6 is implemented to control two constant current output circuits 7 . The control module 6 adopts intelligent units such as MCU (microcontroller), and can also be an interface circuit that can adjust the working state such as a digital logic circuit, a switch circuit, and an analog regulating circuit. The signal processing module 5 for current control and the constant current output circuit 7 can respectively receive the electrical signal output by the control module 6 , and adjust their working states according to the electrical signal output by the control module 6 .

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. watt-hour meter micro-electric current inquiry power supply energy-saving guard system, it is characterized in that, comprise a power supply recognition system, described power supply recognition system comprises a relay or thyristor, the cathode power supply incoming end of described relay or thyristor access watt-hour meter;

Described power supply recognition system also comprises the supporting signal frequency receiving mechanism of a signal frequency generating mechanism and one and described signal frequency generating mechanism, the cathode power supply incoming end of described signal frequency generating mechanism access watt-hour meter, the negative power supply incoming end of described signal frequency receiving mechanism access watt-hour meter;

Described power supply recognition system also comprises a signal processing system, and the signal input part of described signal processing system connects described signal frequency receiving mechanism, and a control signal output terminal of described signal processing system connects described relay or thyristor.

2. watt-hour meter according to claim 1 micro-electric current inquiry power supply energy-saving guard system, is characterized in that: the occurrence frequency of described signal frequency generating mechanism is less than 5 hertz.

3. watt-hour meter according to claim 1 micro-electric current inquiry power supply energy-saving guard system, is characterized in that: watt-hour meter micro-electric current inquiry power supply energy-saving guard system also comprises a keyswitch, and described keyswitch connects described signal processing system.

4. the micro-electric current inquiry of the watt-hour meter according to claim 1,2 or 3 power supply energy-saving guard system, it is characterized in that: watt-hour meter micro-electric current inquiry power supply energy-saving guard system, also comprise a load current regulating system, described load current regulating system comprises a control module, described control module is provided with a control signal output terminal, described control module connects a voltage-adjusting unit by control signal output terminal, and the signal output part of described voltage-adjusting unit connects a Current Control signal processing module;

Described supply line is provided with a constant current output circuit, described Current Control signal processing module receives the conditioning signal of described voltage-adjusting unit, and after analyzing and processing is carried out to conditioning signal, export to constant current output circuit, realize the adjustment of described constant current output circuit output current.

5. watt-hour meter according to claim 4 micro-electric current inquiry power supply energy-saving guard system, is characterized in that: described signal processing system communicates to connect a host computer by described signal frequency generating mechanism.

6. watt-hour meter according to claim 5 micro-electric current inquiry power supply energy-saving guard system, it is characterized in that: described control module is also provided with a control signal input end, described control signal input end connects described signal processing system;

A Current adjustment static database matched containing the output valve of constant current output circuit and the control signal of voltage-adjusting unit is provided with in described host computer, described host computer judges the output valve needing the constant current output circuit regulated, search the control signal matched, by described signal processing system, described control signal is passed to described control module, export to described voltage-adjusting unit by described control module again, realize the adjustment to constant current output circuit output current.

7. watt-hour meter according to claim 6 micro-electric current inquiry power supply energy-saving guard system, it is characterized in that: in described host computer, be also provided with a dynamic data base, described host computer input signal to external world carries out record, and stored in dynamic data base, dynamic data base is in use expanded, and forms the dynamic data base that has Self-learning Model; Described host computer judges the output valve needing the constant current output circuit regulated, the value that the output valve of constant current output circuit obtained according to unceasing study in dynamic data base and the control signal of voltage-adjusting unit match exports control signal, by described signal processing system, described control signal is passed to described control module, export to described voltage-adjusting unit by described control module again, realize the adjustment to constant current output circuit output current.

8. watt-hour meter according to claim 4 micro-electric current inquiry power supply energy-saving guard system, it is characterized in that: described voltage-adjusting unit receives the control signal that described control module exports, regulate the equivalent resistance between the mxm. end of conditioning signal and conditioning signal end and between the minimum end of conditioning signal end and conditioning signal, realize the control outputting to the conditioning signal of described Current Control signal processing module.

9. watt-hour meter according to claim 8 micro-electric current inquiry power supply energy-saving guard system, it is characterized in that: also comprise a reference voltage module, the output voltage maximal value end of described reference voltage module, output voltage minimum value end connect the mxm. end of the conditioning signal of described voltage-adjusting unit, the minimum end of conditioning signal respectively, so that the output signal controlling described voltage regulator module is in the scope of setting.

10. watt-hour meter according to claim 9 micro-electric current inquiry power supply energy-saving guard system, it is characterized in that: between the mxm. end of the conditioning signal of described voltage-adjusting unit and the output voltage maximal value end end of described reference voltage module, be also connected a divider resistance, another divider resistance is connected between the minimum end of the conditioning signal of described voltage-adjusting unit and the output voltage minimum value end of described reference voltage module, the mxm. end of the conditioning signal of two described divider resistances and described voltage-adjusting unit, the minimum end of conditioning signal, conditioning signal end forms a bleeder circuit.