CN220457115U

CN220457115U - Microcomputer protection device

Info

Publication number: CN220457115U
Application number: CN202320720144.9U
Authority: CN
Inventors: 车琦; 凌杰; 陈光军; 蔡弈凯; 许文会; 王勇
Original assignee: SICHUAN ELECTRIC POWER INTELLIGENT DISTRIBUTION EQUIPMENT CO Ltd
Current assignee: SICHUAN ELECTRIC POWER INTELLIGENT DISTRIBUTION EQUIPMENT CO Ltd
Priority date: 2023-04-04
Filing date: 2023-04-04
Publication date: 2024-02-06
Anticipated expiration: 2033-04-04

Abstract

The utility model relates to a microcomputer protection device, which relates to the microcomputer protection field; the device comprises a singlechip, an electric quantity signal acquisition circuit connected with the singlechip, a closed loop acquisition driving circuit connected with the singlechip and an isolation power supply circuit; the intelligent digital microcomputer relay protection control device with the protection function can be configured for different loops by adopting a high-capacity and high-redundancy design, and the problems of single function, poor controllability, low data acquisition precision and long protection response time of the traditional relay protection control device are solved.

Description

Microcomputer protection device

Technical Field

The utility model relates to the field of microcomputer protection, in particular to a microcomputer protection device.

Background

At present, the traditional relay protection device plays a great role in ensuring the safe and stable operation of the power system, but the traditional relay protection device has less state information, low transmission speed and weak networking capability; meanwhile, the traditional relay protection device has single protection function, low electric quantity data acquisition precision and long protection response time.

The present utility model therefore proposes a microcomputer protection device to solve at least some of the above problems.

Disclosure of Invention

The utility model aims to solve the technical problems that: in order to solve the problems of single function, poor controllability, low data acquisition precision and long protection response time of the electromechanical protection device, a microcomputer protection device is provided.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the microcomputer protection device is characterized by comprising a singlechip, an electric quantity signal acquisition circuit connected with the singlechip, a closed loop acquisition driving circuit connected with the singlechip and an isolation power supply circuit;

the closed-loop acquisition driving circuit comprises an ATF22LV10C chip, a photoelectric isolation circuit, a circuit breaker driving signal closed-loop acquisition circuit, a digital capacitance isolator, an opening amount driving circuit, a protection driving circuit, a circuit breaker state acquisition circuit and an opening amount acquisition circuit; the single chip microcomputer is in bidirectional connection with the ATF22LV10C chip, the single chip microcomputer and the ATF22LV10C chip are connected to the photoelectric isolation circuit, the photoelectric isolation circuit is respectively connected with the opening driving circuit and the protection driving circuit, the opening driving circuit is connected with the external circuit breaker, the protection driving circuit is connected with the driving signal closed loop acquisition circuit, the second photoelectric isolation circuit is connected to the ATF22LV10C chip, the external circuit breaker is connected with the circuit breaker state acquisition circuit and the opening acquisition circuit, the circuit breaker state acquisition circuit and the opening acquisition circuit are connected to the digital capacitor isolator, and the digital capacitor isolator is respectively connected to the ATF22LV10C chip and the single chip microcomputer.

Further, the electric quantity signal acquisition circuit comprises a first signal acquisition circuit and a second signal acquisition circuit; the first signal acquisition circuit and the second signal acquisition circuit comprise a precise current transformer, a precise voltage transformer, a safety protection circuit, a first filtering anti-interference circuit, a second filtering anti-interference circuit, an electric power metering chip and a peak detection circuit; the precise current transformer is respectively connected with the first filtering anti-interference circuit and the safety protection circuit; the safety protection circuit is grounded; the precise voltage transformer is connected with a second filtering anti-interference circuit; the first filter anti-interference circuit and the second filter anti-interference circuit are both connected with the electric power metering chip, the first filter anti-interference circuit is connected with the peak detection circuit, and the peak detection circuit and the electric power metering chip are both connected with the singlechip.

Further, the first filtering anti-interference circuit and the second filtering anti-interference circuit comprise a first input end, a second input end, a first diode, a second diode, a common mode filter, a first resistor, a second resistor, a third resistor, a fourth resistor, a first filtering capacitor, a second filtering capacitor, a first output end and a second output end; the first input end is respectively connected with the anode of the first diode and the first end of the primary winding of the common mode filter, the second input end is connected with the anode of the second diode and the first end of the secondary winding of the common mode filter, the cathode of the first diode is connected with the cathode of the second diode, the second end of the primary winding of the common mode filter is respectively connected with the first resistor and the second resistor, the second end of the secondary winding of the common mode filter is respectively connected with the third resistor and the fourth resistor, the connection node of the second resistor and the third resistor is connected to the grounding end, the first resistor is connected to the first output end, a first filter capacitor is arranged between the first output end and the grounding end, the fourth resistor is connected to the second output end, and a second filter capacitor is arranged between the second output end and the grounding end.

Further, the isolation power supply circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first inductor, a second inductor, a resistor, a third input end, a fourth input end, a third output end, a fourth output end and a power supply module; the first capacitor and the second capacitor are connected in parallel, a first connecting point of the first capacitor and a first connecting point of the second capacitor are respectively connected with a third input end and a first connecting end of the first inductor, a second connecting end of the first inductor is connected with an input end of the power module, and a second connecting point of the first capacitor and a second capacitor is respectively connected with a fourth input end and a grounding port of the power module; the third capacitor is connected with the resistor in parallel, a first connecting point of the third capacitor and the resistor is respectively connected with the output end of the power module and a first connecting point of the second inductor, a second connecting point of the second inductor is connected with the third output end, a second connecting point of the third capacitor and the resistor is respectively connected with a reference voltage end and a fourth output end of the power module, and a fourth capacitor, a fifth capacitor and a sixth capacitor are connected in parallel between the third output end and the fourth output end.

Further, the circuit breaker driving signal closed loop acquisition circuit comprises a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, an optical coupling device, a transient suppression diode, an action power supply, a circuit breaker closing outlet, a circuit breaker tripping outlet, an action power supply anode and an action power supply cathode; the optical coupling device comprises a light emitting diode and a phototriode, a first connecting node of the seventh capacitor and the eighth capacitor which are connected in parallel is grounded, and a second connecting node of the seventh capacitor and the eighth capacitor which are connected in parallel is respectively connected with an external voltage end and a seventh resistor; the collector electrodes of the seventh resistor, the eighth resistor, the tenth capacitor and the phototriode are all connected with a node; the eighth resistor is connected with a ninth capacitor, and the ninth capacitor is grounded; the emitter electrodes of the tenth capacitor and the phototriode are grounded; the anode of the light-emitting diode is respectively connected with the third resistor and the fourth resistor, and the cathode of the light-emitting diode is respectively connected with the eighth resistor and the ninth resistor; the seventh resistor and the eighth resistor are respectively connected with two ends of the transient suppression diode; two ends of the transient suppression diode are respectively connected with a switching-on outlet of the circuit breaker and a negative electrode of the action power supply; and the switching-on outlet of the circuit breaker, the tripping outlet of the circuit breaker, the positive electrode of the action power supply and the negative electrode of the action power supply are connected in parallel.

Further, the breaker state acquisition circuit comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, an eleventh capacitor, a twelfth capacitor, a third diode, a fourth diode, a breaker switching-on signal input end, a breaker switching-off signal input end and a chip, wherein the breaker switching-on signal input end is respectively connected with a third diode cathode and the tenth resistor, the tenth resistor is connected with a first connecting end of the eleventh resistor, the anode of the third diode is connected with a second connecting end of the eleventh resistor, a connecting node of the tenth resistor and the eleventh resistor is connected with a first reverse input end of the chip, and a connecting node of the third diode and the eleventh resistor and a reverse power end of the chip are both connected with a reverse power supply; the circuit breaker breaking signal input end is connected with a twelfth resistor and a fourth diode cathode respectively, the twelfth resistor is connected with a first connecting end of the thirteenth resistor, the fourth diode anode is connected with a second end of the thirteenth resistor, a connecting node of the twelfth resistor and the thirteenth resistor is connected with a second reverse input end of the chip, a connecting node of the fourth diode and the thirteenth resistor is connected with a reverse power supply, a first forward input end of the chip is connected with a second forward input end of the chip, a fifteenth resistor and a twelfth capacitor are connected in parallel between the connecting node of the first forward input end of the chip and the second forward input end of the chip and the reverse power supply, a forward power supply end of the chip is connected with an eleventh capacitor, the fourteenth resistor is connected with a first connecting node of the fifteenth resistor and the twelfth capacitor, and the forward power supply end of the chip, the fourteenth resistor and the eleventh capacitor are all connected with the forward power supply, and the eleventh capacitor is connected with the reverse power supply.

Further, the CAN communication bus is connected with the singlechip.

Further, the singlechip adopts a GD32F103RC type.

Further, the electric quantity measuring chip adopts HT7036 type.

Compared with the prior art, the utility model has the following beneficial effects: the utility model adopts CAN communication bus networking, the field devices are connected through more than five types of shielded cables and a single bus, so that the networking capability is enhanced, meanwhile, a multi-main communication mechanism of CAN bus arbitration is adopted, each device on the bus CAN autonomously send measurement, state and alarm data, and the data transmission time is reduced; the utility model adopts the miniature high-precision device to be matched with a special electric power metering chip and is matched with a peak detection technology, thereby improving the measurement precision, reducing the detection time and reducing the protection response time; the utility model has three-section type current protection, inverse time limit overcurrent protection, zero sequence time limit one-section protection, zero sequence time limit two-section protection, overvoltage warning, overvoltage tripping, three-phase reclosing once, control loop line breaking warning, non-electric quantity protection, PT line breaking warning, overlong starting time protection, overheat warning protection, overheat tripping protection, zero sequence overvoltage protection, unbalanced voltage, current protection, low voltage protection and voltage loss restarting protection functions (various protection functions), and realizes protection function diversity.

Drawings

Fig. 1 is a block diagram of a closed loop acquisition drive circuit.

Fig. 2 is a block diagram of a power information acquisition circuit.

Fig. 3 is a diagram of a filter immunity circuit.

Fig. 4 is a circuit diagram of an isolated power supply.

Fig. 5 is a circuit diagram of a closed loop acquisition circuit of a circuit breaker drive signal.

Fig. 6 is a circuit diagram of a circuit breaker status acquisition circuit.

The labels in the figures are as follows: a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14), a fifteenth resistor (R15), a resistor (R), a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), a first input terminal (INP), a second input terminal (INN), a third input terminal (IN-24 V+), a fourth input terminal (IN-24V-), a first output terminal (OUTP), a second output terminal (OUTN), a third input terminal (IN-24 V+), a fourth input terminal (IN-24V-), a Common Mode Filter (CMF), a first filter capacitor (C21), a second capacitor C22, a fourth capacitor C2, a fourth capacitor C capacitor (C2), a third capacitor (C2), a fourth capacitor (C2), a third capacitor (C2), and a fourth capacitor (C2C, A tenth capacitor (C10), an eleventh capacitor (C11), a twelfth capacitor (C12), a first inductor (L1), a second inductor (L2), an optocoupler (U28), a power supply module (U1), and a transient suppression diode (TNR 2).

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

As shown in fig. 1, a microcomputer protection device comprises a single chip microcomputer, an electric quantity signal acquisition circuit connected with the single chip microcomputer, a closed loop acquisition driving circuit connected with the single chip microcomputer and an isolation power supply circuit;

The circuit breaker state acquisition circuit and the switching-in amount acquisition circuit acquire external circuit breaker state signals and other state quantity signals, the external circuit breaker state signals and other state quantity signals are transmitted to the ATF22LV10C chip and the singlechip through the digital capacitive isolator, the ATF22LV10C chip and the singlechip process the signals, drive signals are transmitted to the photoelectric isolation circuit, the photoelectric isolation circuit isolates external interference, the photoelectric isolation circuit transmits the processed drive signals to the switching-in amount drive circuit and the circuit breaker drive circuit to drive the external circuit breaker and other equipment, and the circuit breaker drive signal closed loop acquisition circuit acquires the signals after the circuit breaker acts and feeds the signals back to the ATF22LV10C chip to check the working state of the circuit breaker.

The closed-loop driving acquisition circuit applies a closed-loop processing flow of input acquisition, kernel processing, driving control and feedback verification, ensures that the input signal acquisition is accurate, the output signal control is effective, and has the functions of automatic error correction, automatic identification and interference elimination and misoperation prevention; the opening quantity driving circuit and the circuit breaker protection driving circuit are connected with the photoelectric isolation circuit, the circuit breaker state acquisition circuit and the opening quantity acquisition circuit are connected with the digital capacitance isolator, so that electromagnetic interference and surge impact from a power grid are effectively prevented, and the reliability of the system is ensured; the singlechip is mainly responsible for signal acquisition, logic identification and driving output; the ATF22LV10C chip mainly completes feedback verification of the working state of the circuit breaker, ensures the accuracy and the effectiveness of output driving of the singlechip, and also completes the anti-jump protection and action maintaining tasks of the protection device.

Preferably, as shown in fig. 2, the electric quantity signal acquisition circuit comprises a first signal acquisition circuit and a second signal acquisition circuit; the first signal acquisition circuit and the second signal acquisition circuit comprise a precise current transformer, a precise voltage transformer, a safety protection circuit, a first filtering anti-interference circuit, a second filtering anti-interference circuit, an electric power metering chip and a peak detection circuit; the precise current transformer is respectively connected with the first filtering anti-interference circuit and the safety protection circuit; the safety protection circuit is grounded; the precise voltage transformer is connected with a second filtering anti-interference circuit; the first filter anti-interference circuit and the second filter anti-interference circuit are both connected with the electric power metering chip, the first filter anti-interference circuit is connected with the peak detection circuit, and the peak detection circuit and the electric power metering chip are both connected with the singlechip.

The first signal acquisition circuit is a protection electric quantity acquisition circuit, and the second signal acquisition circuit is a measurement electric quantity acquisition circuit; the first signal electric quantity signal acquisition circuit and the second signal electric quantity acquisition circuit are respectively composed of a high-precision current, a voltage transformer and a special electric power metering chip and are matched with a filtering anti-interference circuit, so that the nonlinear measurement error is smaller than 0.1% when the first signal electric quantity signal acquisition circuit and the second signal electric quantity acquisition circuit are input into a dynamic working range (5000:1); the peak detection circuit takes a half cycle as a unit (10 ms) to sample the peak value of the absolute value of the current waveform, realizes the rapid overcurrent detection function, and ensures the rapid protection action and high reliability of the device.

Preferably, as shown in fig. 3, the first filter immunity circuit and the second filter immunity circuit each include a first input terminal (INP), a second input terminal (INN), a first diode (D1), a second diode (D2), a Common Mode Filter (CMF), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a first filter capacitor (C21), a second filter capacitor (C22), a first output terminal (OUTP), and a second output terminal (OUTN); the first input end (INP) is respectively connected with the anode of the first diode (D1) and the first end of the primary winding of the Common Mode Filter (CMF), the second input end is connected with the anode of the second diode (D2) and the first end of the secondary winding of the Common Mode Filter (CMF), the cathode of the first diode (D1) is connected with the cathode of the second diode (D2), the second end of the primary winding of the Common Mode Filter (CMF) is respectively connected with the first resistor (R1) and the second resistor (R2), the second end of the secondary winding of the Common Mode Filter (CMF) is respectively connected with the third resistor (R3) and the fourth resistor (R4), the connection node of the second resistor (R2) and the third resistor (R3) is connected to the ground end (GND), the first resistor is connected to the first output end (OUTP), a first filter capacitor (C21) is arranged between the first output end (OUTP) and the ground end, and the fourth resistor (R4) is connected to the second output end (OUTP) and the second filter end (OUTP) is arranged between the second output end (OUTP) and the second end (OUTP).

Preferably, as shown IN fig. 4, the isolated power circuit includes a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a fifth capacitor (C5), a sixth capacitor (C6), a first inductor (L1), a second inductor (L2), a resistor (R), a third input terminal (IN-24 v+), a fourth input terminal (IN-24V-), a third output terminal (OUT-24 v+), a fourth output terminal (OUT-24V-), and a power module (U1); the first capacitor (C1) and the second capacitor (C2) are connected IN parallel, first connection points of the first capacitor (C1) and the second capacitor (C2) are respectively connected with a third input end (IN-24 V+) and a first connection end of the first inductor (L1), a second connection end of the first inductor (L1) is connected with an input end of the power module (U1), and second connection points of the first capacitor (C1) and the second capacitor (C2) are respectively connected with a fourth input end (IN-24V-) and a grounding port of the power module (U1); the third capacitor (C3) is connected with the resistor (R) in parallel, a first connecting point of the third capacitor (C3) and the resistor (R) is respectively connected with an output end of the power module (U1) and a first connecting end of the second inductor (L2), a second connecting point of the second inductor (L2) is connected with a third output end (OUT-24 V+), a second connecting point of the third capacitor (C3) and the resistor (R) is respectively connected with a reference voltage end of the power module (U1) and a fourth output end (OUT-24V-), and a fourth capacitor (C4), a fifth capacitor (C5) and a sixth capacitor (C6) are connected in parallel between the third output end (OUT-24 V+) and the fourth output end (OUT-24V-). The isolation power circuit isolates electromagnetic interference and protects the safety of the system.

Preferably, as shown in fig. 5, the circuit breaker driving signal closed loop acquisition circuit includes a seventh capacitor (C7), an eighth capacitor (C8), a ninth capacitor (C9), a tenth capacitor (C10), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), an optocoupler (U28), a transient suppression diode (TNR 2), an action power source, a breaker closing outlet, a breaker trip outlet, an action power source anode, an action power source cathode; the optical coupling device comprises a light emitting diode and a phototriode, a first connecting node of the seventh capacitor (C7) and the eighth capacitor (C8) which are connected in parallel is grounded, and a second connecting node of the seventh capacitor (C7) and the eighth capacitor (C8) which are connected in parallel is respectively connected with an external voltage end and a seventh resistor (R7); the seventh resistor (R7), the eighth resistor (R7), the tenth capacitor (C10) and the collector electrode of the phototriode are all connected with a node; the eighth resistor (R8) is connected with a ninth capacitor (C9), and the ninth capacitor (C9) is grounded; the tenth capacitor (C10) and the emitter of the phototriode are grounded; the anode of the light-emitting diode is respectively connected with a third resistor (R3) and a fourth resistor (R4), and the cathode of the light-emitting diode is respectively connected with an eighth resistor (R8) and a ninth resistor (R9); the seventh resistor (R7) and the eighth resistor (R8) are respectively connected with two ends of the transient suppression diode (TNR 2); two ends of a transient suppression diode (TNR 2) are respectively connected with a breaker closing outlet and an action power supply cathode; and the switching-on outlet of the circuit breaker, the tripping outlet of the circuit breaker, the positive electrode of the action power supply and the negative electrode of the action power supply are connected in parallel.

The circuit breaker driving signal acquisition circuit is connected with an external circuit breaker closing coil and an action power supply negative electrode, acquires circuit breaker closing information, feeds back the closing information to the ATF22LV10C chip to be compared and checked with the sent driving signal, and guarantees the reliability of the circuit breaker action.

Preferably, as shown in fig. 6, further, the circuit breaker state acquisition circuit includes a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14), a fifteenth resistor (R15), an eleventh capacitor (C11), a twelfth capacitor (C12), a third diode (D3), a fourth diode (D4), a circuit breaker switching-on signal input terminal (DI 1), a circuit breaker switching-off signal input terminal (DI 2) and a chip, the circuit breaker switching-on signal input terminal (DI 1) is respectively connected with a third diode cathode (D3) and the tenth resistor (R10), the tenth resistor (R10) is connected with a first connection terminal of the eleventh resistor (R11), an anode of the third diode (D3) is connected with a second connection terminal of the eleventh resistor (R11), a connection node of the tenth resistor (R10) and the eleventh resistor (R11) is connected with a first reverse input terminal (2) of the chip, and a connection node of the third diode (D3) and the eleventh resistor (R11) is connected with a reverse power supply (24) of the reverse power supply (V) and the reverse chip; the circuit breaker opening signal input end (DI 2) is respectively connected with a twelfth resistor (R12) and a fourth diode cathode (D4), the twelfth resistor (R12) is connected with a first connection end of a thirteenth resistor (R13), the anode of the fourth diode (D4) is connected with a second end of the thirteenth resistor (R13), a connection node of the twelfth resistor (R12) and the thirteenth resistor (R13) is connected with a second reverse input end (6) of the chip, a connection node of the fourth diode (D4) and the thirteenth resistor (R13) is connected with a reverse power supply (-24V), a first forward input end (3) of the chip is connected with a second forward input end (5) of the chip, a fifteenth resistor (R15) and a twelfth capacitor (C12) are connected in parallel between the connection node of the first forward input end (3) of the chip and the second forward input end (5) of the chip and the reverse power supply (-24V), a forward power supply end (+24V) of the chip is connected with a fourteenth capacitor (C12) of the chip, a forward power supply end (+7V) of the chip is connected with the fourteenth capacitor (C14) is connected with the eleventh capacitor (C11) of the chip, and the forward input end (C) of the chip is connected with the fourteenth capacitor (C12), the eleventh capacitor (C11) is connected with a reverse power supply (-24V).

The circuit breaker state acquisition circuit acquires switching-on and switching-off signals of the circuit breaker and transmits the switching-on and switching-off signals to the singlechip and the ATF22LV10C chip, and the singlechip and the ATF22LV10C chip cooperate to process signals.

Preferably, the CAN communication bus is connected with the singlechip.

The microcomputer protection device adopts CAN communication bus networking, and field devices are connected through more than five types of shielded cables and a single bus, so that the number of the field devices CAN be up to 110; meanwhile, the CAN communication bus arbitrates multi-master communication, and each device on the bus CAN independently send measurement, state and alarm data and respond with the data transmission time millisecond level of the singlechip.

Preferably, the singlechip adopts a GD32F103RC type.

Preferably, the coulometric chip is of the HT7036 type.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The microcomputer protection device is characterized by comprising a singlechip, an electric quantity signal acquisition circuit connected with the singlechip, a closed loop acquisition driving circuit connected with the singlechip and an isolation power supply circuit;

the closed-loop acquisition driving circuit comprises an ATF22LV10C chip, a photoelectric isolation circuit, a circuit breaker driving signal closed-loop acquisition circuit, a digital capacitance isolator, an opening amount driving circuit, a protection driving circuit, a circuit breaker state acquisition circuit and an opening amount acquisition circuit; the single chip microcomputer is in bidirectional connection with the ATF22LV10C chip, the single chip microcomputer and the ATF22LV10C chip are connected to the photoelectric isolation circuit, the photoelectric isolation circuit is respectively connected with the opening driving circuit and the protection driving circuit, the opening driving circuit and the protection driving circuit are connected with the external circuit breaker, the protection driving circuit is connected with the driving signal closed loop acquisition circuit, the driving signal closed loop acquisition circuit is connected to the ATF22LV10C chip, the external circuit breaker is connected with the circuit breaker state acquisition circuit and the opening acquisition circuit, the circuit breaker state acquisition circuit and the opening acquisition circuit are connected to the digital capacitor isolator, and the digital capacitor isolator is respectively connected to the ATF22LV10C chip and the single chip microcomputer.

2. The microcomputer protection device of claim 1 wherein the power signal acquisition circuit comprises a first signal acquisition circuit and a second signal acquisition circuit; the first signal acquisition circuit and the second signal acquisition circuit comprise a precise current transformer, a precise voltage transformer, a safety protection circuit, a first filtering anti-interference circuit, a second filtering anti-interference circuit, an electric power metering chip and a peak detection circuit, wherein the precise current transformer is respectively connected with the first filtering anti-interference circuit and the safety protection circuit; the safety protection circuit is grounded; the precise voltage transformer is connected with a second filtering anti-interference circuit; the first filter anti-interference circuit and the second filter anti-interference circuit are both connected with the electric power metering chip, the first filter anti-interference circuit is connected with the peak detection circuit, and the peak detection circuit and the electric power metering chip are both connected with the singlechip.

3. The microcomputer protection device of claim 2, wherein the first filter immunity circuit and the second filter immunity circuit each comprise a first input terminal, a second input terminal, a first diode, a second diode, a voltage transformer, a first resistor, a second resistor, a third resistor, a fourth resistor, a first filter capacitor, a second filter capacitor, a first output terminal, and a second output terminal; the first input end is respectively connected with the anode of the first diode and the first end of the primary winding of the common mode filter, the second input end is connected with the anode of the second diode and the first end of the secondary winding of the common mode filter, the cathode of the first diode is connected with the cathode of the second diode, the second end of the primary winding of the common mode filter is respectively connected with the first resistor and the second resistor, the second end of the secondary winding of the common mode filter is respectively connected with the third resistor and the fourth resistor, the connection node of the second resistor and the third resistor is connected to the grounding end, the first resistor is connected to the first output end, a first filter capacitor is arranged between the first output end and the grounding end, the fourth resistor is connected to the second output end, and a second filter capacitor is arranged between the second output end and the grounding end.

4. The microcomputer protection device of claim 1 wherein the isolated power circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first inductor, a second inductor, a resistor, a third input terminal, a fourth input terminal, a third output terminal, a fourth output terminal, and a power module; the first capacitor and the second capacitor are connected in parallel, a first connecting point of the first capacitor and a first connecting point of the second capacitor are respectively connected with a third input end and a first connecting end of the first inductor, a second connecting end of the first inductor is connected with an input end of the power module, and a second connecting point of the first capacitor and a second capacitor is respectively connected with a fourth input end and a grounding port of the power module; the third capacitor is connected with the resistor in parallel, the first connection point of the third capacitor and the resistor is respectively connected with the output end of the power module and the first connection point of the second inductor, the second connection point of the second inductor is connected with the third output end, the second connection point of the third capacitor and the resistor is respectively connected with the reference voltage end and the fourth output end of the power module, and a fourth capacitor, a fifth capacitor and a sixth capacitor are connected in parallel between the third output end and the fourth output end.

5. The microcomputer protection device of claim 4, wherein the circuit breaker drive signal closed loop acquisition circuit comprises a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, an optocoupler, a transient suppression diode, an action power source, a circuit breaker closing outlet, a circuit breaker trip outlet, an action power source anode, an action power source cathode; the optical coupling device comprises a light emitting diode and a phototriode, a first connecting node of the seventh capacitor and the eighth capacitor which are connected in parallel is grounded, and a second connecting node of the seventh capacitor and the eighth capacitor which are connected in parallel is respectively connected with an external voltage end and a seventh resistor; the collector electrodes of the seventh resistor, the eighth resistor, the tenth capacitor and the phototriode are all connected with a node; the eighth resistor is connected with a ninth capacitor, and the ninth capacitor is grounded; the emitter electrodes of the tenth capacitor and the phototriode are grounded; the anode of the light-emitting diode is respectively connected with the third resistor and the fourth resistor, and the cathode of the light-emitting diode is respectively connected with the eighth resistor and the ninth resistor; the seventh resistor and the eighth resistor are respectively connected with two ends of the transient suppression diode; two ends of the transient suppression diode are respectively connected with a switching-on outlet of the circuit breaker and a negative electrode of the action power supply; and the switching-on outlet of the circuit breaker, the tripping outlet of the circuit breaker, the positive electrode of the action power supply and the negative electrode of the action power supply are connected in parallel.

6. The microcomputer protection device according to claim 1, wherein the circuit breaker state acquisition circuit comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, an eleventh capacitor, a twelfth capacitor, a third diode, a fourth diode, a circuit breaker switching-on signal input end, a circuit breaker switching-off signal input end and a chip, wherein the circuit breaker switching-on signal input end is respectively connected with a third diode cathode and the tenth resistor, the tenth resistor is connected with a first connection end of the eleventh resistor, an anode of the third diode is connected with a second connection end of the eleventh resistor, a connection node of the tenth resistor and the eleventh resistor is connected with a first reverse input end of the chip, and a connection node of the third diode and the eleventh resistor and a reverse power supply end of the chip are connected with a reverse power supply; the circuit breaker breaking signal input end is connected with a twelfth resistor and a fourth diode cathode respectively, the twelfth resistor is connected with a first connecting end of the thirteenth resistor, the fourth diode anode is connected with a second end of the thirteenth resistor, a connecting node of the twelfth resistor and the thirteenth resistor is connected with a second reverse input end of the chip, a connecting node of the fourth diode and the thirteenth resistor is connected with a reverse power supply, a first forward input end of the chip is connected with a second forward input end of the chip, a fifteenth resistor and a twelfth capacitor are connected in parallel between the connecting node of the first forward input end of the chip and the second forward input end of the chip and the reverse power supply, a forward power supply end of the chip is connected with an eleventh capacitor, the fourteenth resistor is connected with a first connecting node of the fifteenth resistor and the twelfth capacitor, and the forward power supply end of the chip, the fourteenth resistor and the eleventh capacitor are all connected with the forward power supply, and the eleventh capacitor is connected with the reverse power supply.

7. The microcomputer protection device of claim 1, further comprising a CAN communication bus, the CAN communication bus coupled to the single chip microcomputer.

8. The microcomputer protection device of claim 1, wherein the single chip microcomputer is of a GD32F103RC type.

9. A microcomputer protection device as defined in claim 2, wherein the power meter chip is of the HT7036 type.