Multifunctional integrated module for circuit breaker and circuit breaker

Abstract

The utility model discloses a multifunctional integrated module for a circuit breaker. The multifunctional integrated module is installed on the outer side of the circuit breaker in an accessory backpack mode and comprises a power supply circuit used for taking electricity from the wire inlet side of the circuit breaker so as to provide a power supply needed by the multifunctional integrated module and the circuit breaker controller; the current signal acquisition circuit is used for acquiring a current signal output by a measurement mutual inductor of the circuit breaker; the voltage signal acquisition circuit is used for acquiring a voltage signal at the wire inlet side of the circuit breaker; the interface circuit is used for realizing bidirectional data transmission between the multifunctional integration module and the circuit breaker controller and unidirectional power supply transmission from the multifunctional integration module to the circuit breaker controller; the metering chip circuit is used for metering electric energy; the control circuit is used for controlling each circuit; and the communication circuit is used for realizing isolated communication with the outside. The utility model also discloses a circuit breaker. According to the utility model, high-precision measurement and external communication functions are realized at the same time, and the measurement function of the circuit breaker is greatly expanded.

Description

Technical Field

[0001] The utility model relates to a multifunctional integrated module for a circuit breaker. Background Art

[0002] With the construction and development of the power Internet of Things, the low-voltage distribution system has developed rapidly as the terminal of the power grid. As the core component of the low-voltage distribution system, intelligent circuit breakers are widely used. The intelligent circuit breakers on the market usually only have current and voltage protection functions, and cannot monitor power measurement and power quality, nor can they output corresponding alarm signals. Some circuit breakers can display current and voltage themselves, but the accuracy is not high. And for molded case circuit breakers, since most of them use current transformers to obtain energy, they cannot monitor small currents below the starting point. General measuring circuit breakers on the market achieve the measurement function through discrete components. Voltage is sampled by resistor voltage reduction or current transformers, and current is sampled by current transformers and converted into small signals and sent to the A / D module for sampling. After the A / D module samples, it is sent to the MCU for calculation to obtain electrical parameters such as voltage, current, power, and electric energy. This solution has many components, large space, high cost, complex design, and many factors affecting measurement accuracy. In addition, for users who want to install the measurement function, it involves a large amount of reconstruction work, high cost, and is very inconvenient. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a multifunctional integrated module for a circuit breaker. It is installed in the form of an accessory backpack, and can realize all functions such as intelligent measurement of the current, voltage, power, electric energy, power freeze and event recording of the circuit breaker, meet the functions of networking and commissioning and tripping, and can feedback high-precision measurement data to the circuit breaker body for local display.

[0004] The utility model specifically adopts the following technical solutions to solve the above technical problems:

[0005] A multifunctional integrated module for a circuit breaker, the multifunctional integrated module is installed on the outside of the circuit breaker in the form of an accessory backpack, and it includes:

[0006] A power supply circuit for taking power from the incoming line side of the circuit breaker to provide power for the multifunctional integrated module and the circuit breaker controller;

[0007] A current signal acquisition circuit for acquiring the current signal output by the measurement current transformer of the circuit breaker;

[0008] A voltage signal acquisition circuit for acquiring the voltage signal on the incoming line side of the circuit breaker;

[0009] An interface circuit for realizing bidirectional data transmission between the multifunctional integrated module and the circuit breaker controller and unidirectional power transmission from the multifunctional integrated module to the circuit breaker controller;

[0010] A metering chip circuit for performing power metering based on the current signals and voltage signals collected by a current signal acquisition circuit and a voltage signal acquisition circuit;

[0011] A control circuit for controlling each circuit in the multifunctional integrated module;

[0012] A communication circuit for realizing isolated communication between the multifunctional integrated module and the outside.

[0013] Furthermore, the multifunctional integrated module further includes:

[0014] A power-down circuit for performing power-down monitoring based on the voltage signal collected by the voltage signal acquisition circuit and temporarily powering the multifunctional integrated module during power-down.

[0015] Preferably, the power-down circuit includes a power-down detection circuit and a power-down temporary power supply circuit; the power-down detection circuit includes resistors R11, R12 and capacitor C7. One end of resistor R11 is connected to the secondary power supply V+ output by the power supply circuit. The other end of resistor R11 is simultaneously connected to one end of resistor R12, one end of capacitor C7, and an I / O port of the control circuit. The other end of resistor R12 and the other end of capacitor C7 are connected and grounded; the power-down temporary power supply circuit includes an energy storage capacitor C8, resistor R13, a battery, and three diodes. The positive electrode of energy storage capacitor C8 is simultaneously connected to one end of resistor R13 and the positive electrode of the first diode. The other end of resistor R13 is simultaneously connected to the positive electrode of the second diode and the system working power supply VDD. The negative electrode of energy storage capacitor C8 is connected to the negative electrode of the battery and then grounded. The positive electrode of the battery is connected to the positive electrode of the third diode. The negative electrode of the first diode is connected to the system working power supply VDD. The negative electrodes of the second diode and the third diode are connected and then connected to the clock working power supply Vbat of the control circuit.

[0016] Preferably, the control circuit includes an MCU circuit and a storage circuit, a clock circuit, an input circuit, and a pulse output circuit respectively connected to the MCU circuit.

[0017] Preferably, the power supply circuit includes a cascaded three-phase switch power supply N1 and a power supply chip N2. The three-phase switch power supply N1 is used to convert an external three-phase power supply into a secondary power supply V+. The power supply chip N2 is used to convert the power supply V+ into a system working power supply VDD.

[0018] Based on the same inventive concept, the following technical solutions can also be obtained:

[0019] A circuit breaker includes a circuit breaker controller, and this circuit breaker further includes the multifunctional integrated module described in any of the above technical solutions.

[0020] Compared with the prior art, the technical solution of the present utility model has the following beneficial technical effects:

[0021] The multifunctional integrated module of the present utility model simultaneously realizes high-precision measurement of data such as current, voltage, power, and electric energy, as well as external communication functions, greatly expanding the measurement function of the circuit breaker, enabling the circuit breaker controller to display tiny currents, and effectively improving the accuracy of the original current protection function;

[0022] The multifunctional integrated module of the present utility model adopts an integrated solution and is modularly installed in the form of an accessory backpack, which is convenient to use, can reduce the requirement for installation space, and lower the transformation cost of the power distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural block diagram of a preferred embodiment of the multifunctional integrated module of the present utility model;

[0024] Figure 2 It is a specific implementation circuit diagram of a power supply circuit;

[0025] Figure 3 It is a specific implementation circuit diagram of an interface circuit;

[0026] Figure 4 It is a specific implementation circuit diagram of a communication circuit;

[0027] Figure 5 It is a specific implementation circuit diagram of an MCU circuit and a storage circuit;

[0028] Figure 6 It is a specific implementation circuit diagram of a power-down circuit;

[0029] Figure 7 It is a specific implementation circuit diagram of a clock circuit;

[0030] Figure 8 It is a specific implementation circuit diagram of a pulse output circuit and an input circuit;

[0031] Figure 9 It is a specific implementation circuit diagram of a current signal acquisition circuit, a voltage signal acquisition circuit, and a metering chip circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Aiming at the deficiencies of the prior art, based on the idea of integration, the present utility model designs a multifunctional integrated module for a circuit breaker. The multifunctional integrated module is installed on the outside of the circuit breaker in the form of an accessory backpack, and it includes:

[0033] A power supply circuit for taking power from the incoming line side of the circuit breaker to provide power for the multifunctional integrated module and the circuit breaker controller;

[0034] The current signal acquisition circuit is used to acquire the current signal output by the measuring mutual inductor of the circuit breaker;

[0035] The voltage signal acquisition circuit is used to acquire the voltage signal on the incoming line side of the circuit breaker;

[0036] The interface circuit is used to realize the bidirectional data transmission between the multifunctional integration module and the circuit breaker controller and the unidirectional power transmission from the multifunctional integration module to the circuit breaker controller;

[0037] The metering chip circuit is used to perform electric energy metering according to the current signal and voltage signal acquired by the current signal acquisition circuit and the voltage signal acquisition circuit;

[0038] The control circuit is used to control each circuit in the multifunctional integration module;

[0039] The communication circuit is used to realize the isolated communication between the multifunctional integration module and the outside.

[0040] Each functional circuit in the above multifunctional integration module can be implemented by existing technologies, and an appropriate circuit structure can be flexibly selected according to actual needs; for the convenience of the public to understand, the technical solution of the present invention will be described in detail below through a preferred embodiment in conjunction with the drawings:

[0041] The basic architecture of the multifunctional integration module in this embodiment is as Figure 1 shown, including a power supply circuit, a voltage signal acquisition circuit, a current signal acquisition circuit, a metering chip circuit, an interface circuit, an MCU circuit, a storage circuit, a clock circuit, an input circuit, a communication circuit, a pulse output circuit, and a power-off circuit.

[0042] Among them, the power supply circuit takes power from the incoming line side of the circuit breaker, converts the external power input into the working power supply of the multi-functional integrated module, and supplies power to the circuit breaker controller through the interface circuit; the voltage signal acquisition circuit acquires the voltage signal on the incoming line side of the circuit breaker and sends it to the metering chip circuit for processing; a high-precision measuring current transformer is installed on the circuit breaker, and the current signal acquisition circuit acquires the current signal of the measuring current transformer and sends it to the metering chip circuit for processing; the metering chip circuit performs electric energy metering on the current and voltage signals, communicates with the MCU circuit, and outputs active and reactive electric energy pulse signals through the pulse output circuit; the MCU circuit is connected to the circuit breaker controller through the interface circuit, reads the protection measurement data of the circuit breaker, receives the status information of the circuit breaker controller, and integrates it with the real-time clock into the data form required by the DL / T645 protocol, and uploads it to the upper computer through the communication circuit; the MCU circuit also sends the high-precision measurement data back to the circuit breaker controller to replace the original protection measurement data and improve the measurement accuracy of the local display; the power-off circuit samples the voltage converted by the power supply circuit and provides it to the MCU circuit to detect whether there is a power-off, and provides temporary power supply during a power-off; the storage circuit is used to store system parameters and various event record information; the input circuit is used to receive the trip pulse signal and provide it to the MCU circuit to cooperate with the trip command for network joint debugging and trip operation.

[0043] Figure 2 Figure 4 shows a specific implementation circuit of the power supply circuit, which includes a cascaded three-phase switching power supply N1 and a power supply chip N2; the external three-phase power supply generates a secondary power supply V+ after passing through the three-phase switching power supply N1, and the secondary power supply V+ is converted into the system working power supply VDD of the multi-functional integrated module through the power supply chip N2. The power supply V+ also supplies power to the circuit breaker controller, and the capacitors C1 and C2 play a decoupling and filtering role. The power supply chip N2 can be an LDO or a DC / DC.

[0044] Figure 3 Figure 8 shows a specific implementation circuit of the interface circuit, which includes resistors R1, R2, a communication chip N3, and a TVS tube FV1; the MCU circuit is connected to the communication chip N3 and then communicates with the circuit breaker controller through the surge-resistant resistors R1 and R2. The TVS tube FV1 plays a protection role, and the secondary power supply V+ generated by the power supply circuit is provided to the circuit breaker controller through the interface circuit; the communication chip N3 among them can adopt communication chips of types such as RS485 and CAN according to actual needs.

[0045] Figure 4 Figure 12 shows a specific implementation circuit of the communication circuit; such as Figure 4As shown, the MCU circuit is connected to the communication chip N4 and communicates with the host computer through the surge-resistant resistors R8 and R9; the resistors R3, R4, and R7 are pull-up resistors, the resistors R5 and R6 are pull-down resistors, FV2 and FV3 are TVS diodes, and FV4 is a lightning protection tube, which play a protective role, and the capacitors C3 and C4 play a decoupling role.

[0046] Figure 5 Shows a specific implementation circuit of the MCU circuit and the storage circuit. The MCU chip N6 communicates with the circuit breaker controller through the interface circuit and communicates with the host computer through the communication circuit. The MCU chip N6 is connected to the storage chip N5 to store system parameters and various event information; the MCU circuit also receives the power-off discrimination signal V1 and the opening pulse input signal FZMC.

[0047] Figure 6 Shows a specific implementation circuit of the power-off circuit, which includes a power-off detection circuit and a power-off temporary power supply circuit; as Figure 6 shown, the power-off detection circuit includes resistors R11, R12 and capacitor C7. One end of resistor R11 is connected to the secondary power supply V+ output by the power supply circuit. The other end of resistor R11 is simultaneously connected to one end of resistor R12, one end of capacitor C7, and an I / O port of the control circuit. The other end of resistor R12 and the other end of capacitor C7 are connected and grounded; the power-off temporary power supply circuit includes an energy storage capacitor C8, a resistor R13, a battery, and three diodes. The positive electrode of the energy storage capacitor C8 is simultaneously connected to one end of the resistor R13 and the positive electrode of the first diode. The other end of the resistor R13 is simultaneously connected to the positive electrode of the second diode and the system working power supply VDD. The negative electrode of the energy storage capacitor C8 is connected to the negative electrode of the battery and then grounded. The positive electrode of the battery is connected to the positive electrode of the third diode. The negative electrode of the first diode is connected to the system working power supply VDD. The negative electrodes of the second diode and the third diode are connected and then connected to the clock working power supply Vbat of the control circuit. As Figure 6 shown, the resistor R11 divides the secondary power supply V+ generated by the power supply circuit, generates a power-off sampling signal V1 on the sampling resistor R12 and sends it to the MCU circuit, and the capacitor C7 plays a decoupling role; the energy storage capacitor C8 is a large-capacity capacitor. When the power supply is normal, the system working power supply VDD charges the energy storage capacitor C8 through the current-limiting resistor R13. During the power-off period, the energy storage capacitor C8 supplies the system working power supply VDD in reverse, and the battery BATTER is used to provide the clock working power supply Vbat during the power-off.

[0048] Figure 7 Shows a specific implementation circuit of the clock circuit. Among them, N7 is a clock chip, which is used to provide clock information to the MCU circuit. The resistors R14, R15, and R16 are pull-up resistors, and G2 is a clock crystal oscillator.

[0049] Figure 8Shows a specific implementation circuit of the pulse output circuit and the input circuit. The pulse output circuit receives the active energy pulse signal CF1 and the reactive energy pulse signal CF2 output by the MCU circuit, and converts them into isolated energy pulse output signals. Resistors R17 and R18 are current-limiting resistors, and optocouplers N8 and N9 play an isolation role; the opening pulse input signal turns on optocoupler N10 after being current-limited by resistor R20, causing the FZMC signal input to the MCU circuit to change from high level to low level. Resistor R19 is a pull-up resistor.

[0050] Figure 9 Shows a specific implementation circuit of the current signal acquisition circuit, the voltage signal acquisition circuit and the metering chip circuit. As Figure 9 shown, the current signal acquisition circuit performs current-voltage conversion on the current signal output by the measuring mutual inductor, filters out noise interference through RC low-pass filtering, and then sends it to the A / D sampling channel of the metering chip N11; resistors R21 and R22 are sampling resistors, and resistors R23, R24, capacitor C11, and C12 form an RC low-pass filter circuit. The voltage signal acquisition circuit collects the voltage signal through resistor voltage division and sends it to the A / D sampling channel of the metering chip circuit. Resistors R25 and R26 are voltage-dividing resistors, resistor R27 is a sampling resistor, and capacitor C13 is a decoupling capacitor. The metering chip N11 performs electric energy metering on the current and voltage signals, communicates with the MCU circuit through the internal SPI, and the MCU circuit provides functions such as power, electric energy, power consumption freezing, and event recording, and outputs the active energy pulse signal CF1 and the reactive energy pulse signal CF2 externally.

[0051] The above-mentioned multifunctional integrated module can feedback high-precision measurement data to the circuit breaker body for local display, greatly improving the measurement and display accuracy of the circuit breaker body. It can also supply power to the circuit breaker. The circuit breaker controller can display tiny currents and improve the accuracy of the original current protection function; the above-mentioned multifunctional integrated module adopts the form of an accessory backpack, with modular installation, which is convenient to use, can reduce the requirement for installation space, and reduce the transformation cost of the power distribution system; the above-mentioned multifunctional integrated module has rich functions, including all functions such as current, voltage, power, electric energy, power consumption freezing, and event recording, supports the South Grid DL / T645 protocol, and meets the requirements of networking and interconnection adjustment and opening function; the above-mentioned multifunctional integrated module can be adapted to all circuit breakers with communication functions and displays.

Claims

1. A multifunctional integrated module for a circuit breaker, characterized in that: The multifunctional integrated module is installed on the outside of the circuit breaker in the form of an accessory backpack, and includes: A power supply circuit, used to draw power from the incoming line side of the circuit breaker to provide the power required by the multi-functional integrated module and the circuit breaker controller; A current signal acquisition circuit is used to acquire the current signal output by the measuring transformer of the circuit breaker; A voltage signal acquisition circuit is used to acquire the voltage signal on the incoming line side of the circuit breaker; An interface circuit for realizing bidirectional data transmission between the multifunctional integrated module and the circuit breaker controller and unidirectional power transmission from the multifunctional integrated module to the circuit breaker controller; A metering chip circuit is used to measure electric energy according to the current signal and the voltage signal collected by the current signal collection circuit and the voltage signal collection circuit; A control circuit, used to control each circuit in the multifunctional integrated module; The communication circuit is used to realize isolated communication between the multifunctional integrated module and the outside.

2. The multifunctional integrated module according to claim 1, characterized in that: Also includes: The power-off circuit is used to monitor power-off according to the voltage signal collected by the voltage signal collection circuit, and temporarily supply power to the multifunctional integrated module when power is off.

3. The multifunctional integrated module according to claim 2, characterized in that: The power-off circuit includes a power-off detection circuit and a power-off temporary power supply circuit; the power-off detection circuit includes resistors R11, R12 and capacitor C7, one end of the resistor R11 is connected to the secondary power supply V+ output by the power supply circuit, the other end of the resistor R11 is simultaneously connected to one end of the resistor R12, one end of the capacitor C7, and an I / O port of the control circuit, the other end of the resistor R12 and the other end of the capacitor C7 are connected and then grounded; the power-off temporary power supply circuit includes an energy storage capacitor C8, a resistor R13 and a battery, and three diodes, the positive electrode of the energy storage capacitor C8 is simultaneously connected to one end of the resistor R13 and the positive electrode of the first diode, the other end of the resistor R13 is simultaneously connected to the positive electrode of the second diode and the system working power supply VDD, the negative electrode of the energy storage capacitor C8 is connected to the negative electrode of the battery and then grounded, the positive electrode of the battery is connected to the positive electrode of the third diode, the negative electrode of the first diode is connected to the system working power supply VDD, the negative electrode of the second diode is connected to the negative electrode of the third diode and then connected to the clock working power supply Vbat of the control circuit.

4. The multifunctional integrated module according to claim 1, characterized in that: The control circuit comprises an MCU circuit and a storage circuit, a clock circuit, an input circuit and a pulse output circuit respectively connected to the MCU circuit.

5. The multifunctional integrated module according to claim 1, characterized in that: The power supply circuit includes a cascaded three-phase switching power supply N1 and a power supply chip N2. The three-phase switching power supply N1 is used to convert an external three-phase power supply into a secondary power supply V+, and the power supply chip N2 is used to convert the power supply V+ into a system working power supply VDD.

6. A circuit breaker, comprising a circuit breaker controller, characterized in that: The circuit breaker also includes the multifunctional integrated module as claimed in any one of claims 1 to 5.

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