A circuit for an intelligent circuit breaker and the intelligent circuit breaker itself.

Abstract

The application discloses a circuit of an intelligent circuit breaker and the intelligent circuit breaker, and belongs to the technical field of circuit breakers. The circuit comprises a main control circuit, a communication circuit, a power supply circuit, a tripping control circuit, a leakage detection circuit, a current detection circuit for detecting phase current and a voltage detection circuit for detecting phase voltage. The power supply circuit is used for supplying power to the current detection circuit, the voltage detection circuit, the leakage detection circuit, the tripping control circuit and the main control circuit respectively. The current detection circuit is electrically connected with a first input end of the main control circuit. The voltage detection circuit is electrically connected with a second input end of the main control circuit. The leakage detection circuit is electrically connected with a third input end of the main control circuit. A first output end of the main control circuit is electrically connected with the tripping control circuit. The main control circuit is electrically connected with the communication circuit. The circuit of the application is used for collecting various information such as voltage, current, temperature and leakage during the working process of the circuit breaker, and can monitor power failure and protect the safety of life and property of users.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more particularly to a circuit of an intelligent circuit breaker and the intelligent circuit breaker itself. Background Technology

[0002] With the widespread use of electrical appliances, electrical safety issues have become prominent, such as electrical leakage and fires caused by appliance burnout, making the circuit safety situation severe. Traditional circuit breakers lack data acquisition capabilities, and their circuit safety protection schemes are outdated, failing to detect circuit safety problems in a timely manner. Furthermore, triggering power outages typically requires manual operation or fuse blowing, which cannot accurately and promptly cut off power to protect users' lives and property. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a circuit of an intelligent circuit breaker and an intelligent circuit breaker.

[0004] The technical solution of this invention is implemented as follows: This invention discloses a circuit for an intelligent circuit breaker, including a main control circuit, a communication circuit, a power supply circuit, a trip control circuit, a leakage current detection circuit, a current detection circuit for detecting phase current, and a voltage detection circuit for detecting phase voltage. The power supply circuit supplies power to the current detection circuit, voltage detection circuit, leakage current detection circuit, trip control circuit, and main control circuit respectively. The current detection circuit is electrically connected to the first input terminal of the main control circuit, the voltage detection circuit is electrically connected to the second input terminal of the main control circuit, the leakage current detection circuit is electrically connected to the third input terminal of the main control circuit, the first output terminal of the main control circuit is electrically connected to the trip control circuit, and the main control circuit is electrically connected to the communication circuit.

[0005] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes a display circuit, which is electrically connected to the main control circuit;

[0006] And / or,

[0007] It also includes an instruction input circuit, which is electrically connected to the main control circuit;

[0008] And / or,

[0009] It also includes a temperature detection circuit for detecting the internal temperature of the circuit breaker, which is electrically connected to the main control circuit.

[0010] Furthermore, the voltage detection circuit includes a metering chip and a voltage sampling circuit. The input terminal of the voltage sampling circuit is used to receive the phase voltage, and the output terminal of the voltage sampling circuit is connected to the voltage measurement signal input terminal VAP of the metering chip. The output terminal of the metering chip is connected to the main control circuit.

[0011] Furthermore, the voltage measurement signal input terminal VAN of the metering chip is connected to one end of resistor R20, the other end of resistor R20 is grounded, and capacitor C29 is connected in parallel across the two ends of resistor R20.

[0012] Furthermore, the voltage sampling circuit includes a voltage divider unit and a resistor R7. One end of the voltage divider unit is used to receive the phase voltage, and the other end of the voltage divider unit is connected to the voltage measurement signal input terminal of the metering chip and one end of the resistor R7, respectively. The other end of the resistor R7 is grounded. A capacitor C1 is connected in parallel across the two ends of the resistor R7.

[0013] Furthermore, the voltage sampling circuit includes resistors R7, R14, and R21, as well as capacitors C1, C2, and C3. Resistor R7 is connected in parallel with capacitor C1, resistor R14 is connected in parallel with capacitor C2, and resistor R21 is connected in parallel with capacitor C3. The first end of resistor R7 is electrically connected to phase A via a first voltage divider unit, the first end of resistor R14 is electrically connected to phase B via a second voltage divider unit, and the first end of resistor R21 is electrically connected to phase C via a third voltage divider unit. The second ends of resistors R7, R14, and R21 are all grounded. The first end of resistor R7 is the phase A voltage detection point, the first end of resistor R14 is the phase B voltage detection point, and the first end of resistor R21 is the phase C voltage detection point. The phase A, phase B, and phase C voltage detection points are respectively connected to the voltage measurement signal input terminals of the metering chip, and the output terminal of the metering chip is connected to the main control circuit.

[0014] Furthermore, the current detection circuit includes a phase current transformer for detecting the current of each phase. One end of the phase current transformer is connected to one end of resistor R19 and one end of resistor R23, respectively. The other end of resistor R19 is connected to the current measurement signal input terminal IAP of the metering chip and one end of capacitor C28, respectively. The other end of resistor R23 and the other end of capacitor C28 are grounded. The other end of the phase current transformer is connected to one end of resistor R25 and one end of resistor R24, respectively. The other end of resistor R25 is connected to the current measurement signal input terminal IAN of the metering chip and one end of capacitor C32, respectively. The other end of resistor R24 ​​and the other end of capacitor C32 are grounded. The output terminal of the metering chip is connected to the main control circuit.

[0015] Furthermore, the leakage current detection circuit includes a zero-sequence current transformer. One end of the zero-sequence current transformer is connected to one end of resistor R41, one end of capacitor C44, the input terminal of the second filter circuit, and one end of the second clamping circuit. The other ends of resistor R41 and capacitor C44 are grounded, the other end of the second clamping circuit is grounded, the output terminal of the second filter circuit is connected to the input terminal of the second amplifier, and the output terminal of the second amplifier is connected to the input terminal LeakCurrent of the main control circuit.

[0016] Furthermore, the leakage current detection circuit includes a test winding, one end of which is connected to one end of a first power resistor, the other end of which is connected to a phase line, and the other end of the test winding is grounded through a test switch device. When the test winding is energized, the zero-sequence current transformer can detect the current signal.

[0017] Furthermore, the test winding and the zero-sequence current transformer are wound on the same magnetic ring.

[0018] Furthermore, the circuit of the intelligent circuit breaker also includes a rectifier unit, the input terminal of which is connected to the phase line, the output terminal of which is connected to one end of the second power resistor, and the other end of the second power resistor is connected to the power interface.

[0019] Furthermore, the circuit of the intelligent circuit breaker also includes a first rectifier unit, a second rectifier unit, and a third rectifier unit. The first end of the first rectifier unit is electrically connected to phase A, the first end of the second rectifier unit is electrically connected to phase B, and the first end of the third rectifier unit is electrically connected to phase C. The second ends of the first rectifier unit, the second ends of the second rectifier unit, and the second ends of the third rectifier unit are connected to one end of a second power resistor, and the other end of the second power resistor is connected to a power interface.

[0020] Furthermore, the first rectifier unit, the second rectifier unit, and the third rectifier unit are each composed of at least one diode connected in series, with the positive terminal being the first terminal and the negative terminal being the second terminal.

[0021] Furthermore, the communication circuit includes an RS485 communication circuit, which includes an isolator chip U6 and an RS485 communication chip. The isolator chip U6 is connected between the RS485 communication chip and the main control circuit, and the RS485 communication chip is connected to the communication interface.

[0022] or / and,

[0023] The communication circuit includes a wireless communication chip, which is electrically connected to the main control circuit.

[0024] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes a PE disconnection detection circuit, which includes an optocoupler UO1. The first input terminal of the optocoupler UO1 is connected to a first voltage via a resistor. The second input terminal of the optocoupler UO1 is connected to PE_IN. The first output terminal of the optocoupler UO1 is connected to the first input terminal of the main control circuit, one end of the resistor R11, and one end of the capacitor C8. The other end of the resistor R11 is connected to the voltage VDD. The other end of the capacitor C8 is grounded. The second output terminal of the optocoupler UO1 is grounded. PE_IN is connected to the earth.

[0025] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes a PE circuit detection circuit, which includes a current transformer T2 and an operational amplifier OPA. The first input terminal of the current transformer T2 is connected to the PE line, the second input terminal of the current transformer T2 is connected to the N line, the first output terminal of the current transformer T2 is connected to one end of a resistor R4, one end of a capacitor C2, the input terminal of a first filter circuit, and one end of a first clamping circuit, respectively. The other ends of the resistor R4 and the other ends of the capacitor C2 are grounded, the other end of the first clamping circuit is grounded, the output terminal of the first filter circuit is connected to the input terminal of the first amplifier, and the output terminal of the first amplifier is connected to the input terminal CheckPE of the main control circuit.

[0026] The present invention also discloses an intelligent circuit breaker, which employs the circuit of the intelligent circuit breaker described above.

[0027] Compared with the prior art, the present invention has the following beneficial effects: The circuit of the present invention is used to collect various voltage, current, temperature, leakage current and other information during the operation of the circuit breaker. By monitoring various voltage, current, temperature and leakage current and other information during the operation of the circuit breaker in real time, the power failure can be judged, and the circuit breaker body can be operated to perform the tripping operation when the power failure occurs, which is convenient for protecting the life and property safety of users.

[0028] The power usage status of the electrical distribution box used in construction can also be monitored in real time through the circuit breaker. In case of power failure risk, the management personnel will be alerted in real time to find the power failure point in time for maintenance and eliminate safety risks. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the intelligent circuit breaker provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the structure of the data acquisition device for the intelligent circuit breaker provided in an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the bottom shell and cover plate of the data acquisition device for the intelligent circuit breaker provided in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the bottom shell of the data acquisition device for the intelligent circuit breaker provided in an embodiment of the present invention;

[0033] Figure 5 This is an installation diagram of the phase current transformer and the zero-sequence current transformer provided in an embodiment of the present invention;

[0034] Figure 6 A circuit diagram of a data acquisition board provided in an embodiment of the present invention;

[0035] Figure 7 A circuit diagram of a rectifier board provided for an embodiment of the present invention;

[0036] Figure 8 A circuit diagram of the main control circuit section of the motherboard provided in an embodiment of the present invention;

[0037] Figure 9 A circuit diagram of the metering chip section of the motherboard provided in an embodiment of the present invention;

[0038] Figure 10 A circuit diagram of an RS485 communication circuit provided in an embodiment of the present invention;

[0039] Figure 11 A circuit diagram of a trip control circuit provided in an embodiment of the present invention;

[0040] Figure 12 A circuit diagram of the PE loop detection circuit provided in an embodiment of the present invention;

[0041] Figure 13 A circuit diagram of the PE disconnection detection circuit provided in an embodiment of the present invention;

[0042] Figure 14 A circuit diagram of a power supply circuit provided for an embodiment of the present invention;

[0043] Figure 15 A circuit diagram of a display circuit provided in an embodiment of the present invention;

[0044] Figure 16 A circuit diagram of a leakage current detection circuit provided in an embodiment of the present invention;

[0045] Figure 17 A schematic block diagram of the circuit of the intelligent circuit breaker provided in an embodiment of the present invention (power supply circuit not shown).

[0046] In the attached diagram, 1 is the electronic module, 2 is the data acquisition device, 21 is the bottom shell, 211 is the first receiving slot, 212 is the second receiving slot, 213 is the hollow cylinder, 214 is the through hole, 215 is the first connecting hole, 22 is the cover plate, 221 is the first through hole, 222 is the second through hole, 223 is the third through hole, 224 is the second connecting hole, 23 is the phase current transformer, 24 is the zero-sequence current transformer, 251 is the A terminal, 252 is the B terminal, 253 is the C terminal, 254 is the N terminal, 255 is the PE terminal, 26 is the data transmission interface, 27 is the power interface, and 3 is the circuit breaker body. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] In the various figures, the same elements are represented by similar reference numerals. For clarity, not all parts in the figures are drawn to scale. Furthermore, some well-known parts may not be shown in the figures.

[0050] Many specific details of the invention, such as the structure, materials, dimensions, processing methods, and techniques of the components, are described below to provide a clearer understanding of the invention. However, as those skilled in the art will understand, the invention may be implemented without following these specific details.

[0051] Example 1

[0052] See Figure 17This invention discloses a circuit for an intelligent circuit breaker, including a main control circuit, a communication circuit, a power supply circuit, a trip control circuit, a leakage current detection circuit, a current detection circuit for detecting phase current, and a voltage detection circuit for detecting phase voltage. The power supply circuit supplies power to the current detection circuit, voltage detection circuit, leakage current detection circuit, trip control circuit, and main control circuit respectively. The current detection circuit is electrically connected to the first input terminal of the main control circuit, the voltage detection circuit is electrically connected to the second input terminal of the main control circuit, the leakage current detection circuit is electrically connected to the third input terminal of the main control circuit, the first output terminal of the main control circuit is electrically connected to the trip control circuit, and the main control circuit is electrically connected to the communication circuit.

[0053] The current detection circuit in this embodiment is used to detect the current of each phase on the outgoing side of the smart circuit breaker.

[0054] In some embodiments, the current detection circuit is used to collect the A, B, and C phase currents of the circuit breaker.

[0055] The voltage detection circuit in this embodiment is used to detect the voltage of each phase on the outgoing side of the smart circuit breaker.

[0056] In some embodiments, the voltage detection circuit includes a voltage sampling circuit and a metering chip. The voltage sampling circuit is used to collect the three-phase voltages of the circuit breaker (A, B, and C) and transmit them to the metering chip.

[0057] The input terminal of the voltage sampling circuit is used to receive the phase voltage, the output terminal of the voltage sampling circuit is connected to the voltage measurement signal input terminal VAP of the metering chip, and the output terminal of the metering chip is connected to the main control circuit.

[0058] The voltage measurement signal input terminal VAN of the metering chip is connected to one end of resistor R20, the other end of resistor R20 is grounded, and capacitor C29 is connected in parallel across the two ends of resistor R20.

[0059] The voltage sampling circuit includes a voltage divider unit and a resistor R7. One end of the voltage divider unit is used to receive the phase voltage, and the other end of the voltage divider unit is connected to the voltage measurement signal input terminal of the metering chip and one end of the resistor R7. The other end of the resistor R7 is grounded. A capacitor C1 is connected in parallel across the two ends of the resistor R7.

[0060] In some embodiments, the voltage sampling circuit includes resistors R7, R14, and R21, and capacitors C1, C2, and C3. Resistor R7 is connected in parallel with capacitor C1, resistor R14 is connected in parallel with capacitor C2, and resistor R21 is connected in parallel with capacitor C3. The first end of resistor R7 is electrically connected to phase A via a first voltage divider unit. The second end of resistor R7, the second end of resistor R14, and the second end of resistor R21 are all grounded. The first end of resistor R14 is electrically connected to phase B via a second voltage divider unit, and the first end of resistor R21 is electrically connected to phase C via a third voltage divider unit. The first end of resistor R7 is the phase A voltage detection point, the first end of resistor R14 is the phase B voltage detection point, and the first end of resistor R21 is the phase C voltage detection point. The phase A, phase B, and phase C voltage detection points are respectively connected to the voltage measurement signal input terminals of the metering chip. The output terminal of the metering chip is connected to the main control circuit. The voltage sampling circuit of the present invention is not limited to the above embodiments; other voltage sampling circuits can also be used.

[0061] In some embodiments, the current detection circuit includes a current sampling circuit, a metering chip, and a phase current transformer for acquiring phase current. The phase current transformer is connected to the input terminal of the current sampling circuit, the output terminal of the current sampling circuit is connected to the current measurement signal input terminal of the metering chip, and the output terminal of the metering chip is used to connect to the main control circuit.

[0062] In some embodiments, taking phase A as an example, the current sampling circuit includes resistors R19, R23, R24, and R25, as well as capacitors C28 and C32. One end of the phase current transformer is connected to one end of resistor R19 and one end of resistor R23, respectively. The other end of resistor R19 is connected to the current measurement signal input terminal IAP of the metering chip and one end of capacitor C28, respectively. The other end of resistor R23 and the other end of capacitor C28 are grounded. The other end of the phase current transformer is connected to one end of resistor R25 and one end of resistor R24, respectively. The other end of resistor R25 is connected to the current measurement signal input terminal IAN of the metering chip and one end of capacitor C32, respectively. The other end of resistor R24 ​​and the other end of capacitor C32 are grounded. The output terminal of the metering chip is connected to the main control circuit.

[0063] Furthermore, the leakage current detection circuit includes a zero-sequence current transformer. One end of the zero-sequence current transformer is connected to one end of resistor R41, one end of capacitor C44, the input terminal of the second filter circuit, and one end of the second clamping circuit. The other ends of resistor R41 and capacitor C44 are grounded, the other end of the second clamping circuit is grounded, the output terminal of the second filter circuit is connected to the input terminal of the second amplifier, and the output terminal of the second amplifier is connected to the input terminal LeakCurrent of the main control circuit.

[0064] In some embodiments, one end of the zero-sequence current transformer is connected to one end of resistor R41, one end of capacitor C44, one end of resistor R37, and the first terminal of the dual-series switching diode D2. The other ends of resistor R41 and capacitor C44 are grounded. The second and third terminals of the dual-series switching diode D2 are grounded. The other end of resistor R37 is connected to one end of capacitor C45 and one end of resistor R38. The other end of capacitor C45 is grounded. The other end of resistor R38 is connected to the input terminal of the second amplifier. The output terminal of the second amplifier is connected to the input terminal LeakCurrent of the main control circuit.

[0065] Furthermore, one end of the zero-sequence current transformer is connected to one end of resistor R41, one end of capacitor C44, one end of resistor R37, and the first terminal of the dual-series switching diode D2. The other end of resistor R41 and the other end of capacitor C44 are grounded. The second and third terminals of the dual-series switching diode D2 are grounded. The other end of resistor R37 is connected to one end of capacitor C45 and one end of resistor R38. The other end of capacitor C45 is grounded. The other end of resistor R38 is connected to the negative input terminal of operational amplifier U2. The negative input terminal of operational amplifier U2 is connected to one end of resistor R34. The other end of resistor R34 is connected to the output terminal of operational amplifier U2. The positive input terminal of operational amplifier U2 is grounded. The output terminal of operational amplifier U2 is connected to one end of inductor L2. The other end of inductor L2 is connected to one end of resistor R42, one end of capacitor C46, ​​and the input terminal LeakCurrent of the main control circuit. The other ends of resistor R42 and capacitor C46 are grounded.

[0066] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes a test winding. One end of the test winding is connected to one end of a first power resistor, and the other end of the first power resistor is connected to a phase line. The other end of the test winding is grounded through a test switch device. When the test winding is energized, a zero-sequence current transformer can detect a current signal. When the test switch device is closed, the test winding is energized, and the zero-sequence current transformer can detect a current signal and transmit it to the main control circuit. The main control circuit controls the circuit breaker to trip, thus detecting whether the circuit breaker can perform a tripping operation.

[0067] Furthermore, the test winding and the zero-sequence current transformer are wound on the same magnetic ring.

[0068] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes a rectifier unit, the input terminal of which is connected to the phase line, the output terminal of which is connected to one end of the second power resistor, and the other end of the second power resistor is connected to the power interface.

[0069] In some embodiments, the circuit of the intelligent circuit breaker further includes a first rectifier unit, a second rectifier unit, and a third rectifier unit. The first end of the first rectifier unit is electrically connected to phase A, the first end of the second rectifier unit is electrically connected to phase B, the first end of the third rectifier unit is electrically connected to phase C, the second end of the first rectifier unit, the second end of the second rectifier unit, and the second end of the third rectifier unit are connected to one end of a second power resistor, and the other end of the second power resistor is connected to a power interface.

[0070] The first rectifier unit, the second rectifier unit, and the third rectifier unit are each composed of at least one rectifier diode connected in series, with its positive terminal being the first terminal and its negative terminal being the second terminal.

[0071] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes a display circuit, which is electrically connected to the main control circuit.

[0072] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes an instruction input circuit, which is electrically connected to the main control circuit.

[0073] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes a temperature detection circuit, which is electrically connected to the main control circuit. The temperature detection circuit uses a thermistor. One end of the thermistor is connected to one end of resistor R23 and one end of resistor R24, respectively. The other end of resistor R23 is connected to the power supply voltage VCC, and the other end of resistor R24 ​​is connected to the data transmission interface 26, i.e., connector P4, and connected to the AD sampling port of the main control chip (the main control chip is the MCU on the main board) via connector P4. The other end of resistor R24 ​​is connected to one end of capacitor C4, and the other end of capacitor C4 and the other end of the thermistor are grounded. The other end of capacitor C4 and the other end of the thermistor are connected to the N terminal 254.

[0074] Furthermore, the communication circuit includes a wired communication circuit, which is connected to the main control circuit.

[0075] Furthermore, the wired communication circuit is an RS485 communication circuit, which includes an isolator chip U6 and an RS485 communication chip. The isolator chip U6 is connected between the RS485 communication chip and the main control circuit, and the RS485 communication chip is connected to the communication interface.

[0076] Furthermore, the communication circuit includes a wireless communication chip, which is electrically connected to the main control circuit.

[0077] Further, see Figure 10The RS485 communication circuit includes an isolator chip U6 and an RS485 communication chip. The isolator chip U6 is connected between the RS485 communication chip and the main control chip, and the RS485 communication chip is connected to the communication interface.

[0078] Furthermore, the motherboard is equipped with a 485 isolated power supply circuit. The 485 isolated power supply circuit includes an isolated power module MUX1, the input terminal of which is connected to a first voltage, and the output terminal of which outputs a second voltage to power the RS485 communication chip.

[0079] See Figure 11 The trip control circuit includes a driver chip U3 and a transistor MOS1. The input terminal of the driver chip U3 is connected to the output terminal of the main control circuit, and the output terminal of the driver chip U3 is connected to the control terminal of the transistor MOS1. The first terminal of the transistor MOS1 is grounded, and the second terminal of the transistor MOS1 is connected to the second pin of connector J4 and the positive terminal of diode D6. The negative terminal of diode D6 is connected to the first voltage HVDC and the first pin of connector J4.

[0080] Connector J4 connects to the electric operating module. The trip control circuit controls the energization or de-energization of the electric operating module, thereby controlling the tripping of the smart circuit breaker. The electric operating module can be, but is not limited to, an electromagnet.

[0081] Further, see Figure 12 The circuit of the intelligent circuit breaker of the present invention further includes a PE circuit detection circuit, which includes a current transformer T2 and an operational amplifier OPA. The first input terminal of the current transformer T2 is connected to the PE line, the second input terminal of the current transformer T2 is connected to the N line, the first output terminal of the current transformer T2 is connected to one end of a resistor R4, one end of a capacitor C2, the input terminal of a first filter circuit, and one end of a first clamping circuit, respectively. The other ends of the resistor R4 and the other ends of the capacitor C2 are grounded, the other end of the first clamping circuit is grounded, the output terminal of the first filter circuit is connected to the input terminal of the first amplifier, and the output terminal of the first amplifier is connected to the input terminal CheckPE of the main control circuit.

[0082] Furthermore, the circuit of the intelligent circuit breaker of the present invention also includes a PE circuit detection circuit, which includes a current transformer T2 and an operational amplifier OPA. The first input terminal of the current transformer T2 is connected to the PE outgoing line PE_OUT (the PE outgoing line PE_OUT is connected to the circuit breaker housing), and the second input terminal of the current transformer T2 is connected to the N line PE_C. The first output terminal of the current transformer T2 is connected to one end of resistor R4, one end of capacitor C2, one end of resistor R2, and the first terminal of the dual series-connected switching diode D1. The other ends of resistor R4 and capacitor C2 are grounded. The second and third terminals of diode D1 are grounded. The other end of resistor R2 is connected to one end of capacitor C3 and one end of resistor R3, respectively. The other end of capacitor C3 is grounded. The other end of resistor R3 is connected to the negative input terminal of operational amplifier U1. The negative input terminal of operational amplifier U1 is connected to one end of resistor R1. The other end of resistor R1 is connected to the output terminal of operational amplifier U1. The positive input terminal of operational amplifier U1 is grounded. The output terminal of operational amplifier U1 is connected to one end of inductor L1. The other end of inductor L1 is connected to one end of resistor R6, one end of capacitor C5, and the input terminal CheckPE of the main control circuit, respectively. The other ends of resistor R6 and capacitor C5 are grounded.

[0083] The first clamping circuit includes a dual series-connected switching diode D1. The function of the dual series-connected switching diode D1 is to clamp the voltage at a set value.

[0084] Resistors R2 and R3, along with capacitor C3, form a filter circuit.

[0085] The PE circuit detection circuit of this invention can be used for water ingress monitoring of circuit breakers. When water enters the circuit breaker, the current transformer T2 can detect a current signal. The PE circuit detection circuit of this invention can also detect leakage current.

[0086] Further, see Figure 13 The circuit of the intelligent circuit breaker of the present invention further includes a PE disconnection detection circuit, which includes an optocoupler UO1. The first input terminal of the optocoupler UO1 is connected to the first voltage HVDC via a resistor. The second input terminal of the optocoupler UO1 is connected to PE_IN. The first output terminal of the optocoupler UO1 is connected to the first input terminal of the main control circuit, one end of the resistor R11, and one end of the capacitor C8. The other end of the resistor R11 is connected to the voltage VDD. The other end of the capacitor C8 is grounded. The second output terminal of the optocoupler UO1 is grounded. PE_IN is connected to the earth.

[0087] The PE disconnection detection circuit is used to detect whether PE is connected. The principle of the PE disconnection detection circuit is as follows: HVDC is the voltage after three-phase rectification and filtering; PE_IN is connected to ground; CheckPE_Leak is the high / low level signal output by the optocoupler, which is sent to the MCU. When PE_IN is properly grounded, there is approximately 300V DC voltage between HVDC and PE_IN, the optocoupler conducts, and CheckPE_Leak is low; otherwise, it is high. The MCU determines whether PE_IN is connected to ground by detecting the high / low level of CheckPE_Leak.

[0088] Example 2

[0089] See Figures 1 to 17 This invention provides an intelligent circuit breaker, including a circuit breaker body 3, a data acquisition device 2, and an electronic module 1. The data acquisition device 2 is detachably connected to the circuit breaker body 3, and its terminals are inserted into the circuit breaker body 3 and electrically connected to the outgoing or incoming terminals of the circuit breaker body 3. Both the incoming and outgoing sides of the circuit breaker body have screw holes for fixing wires (wiring). The screw holes on the incoming side of the circuit breaker body correspond one-to-one with the incoming terminals. The screw holes on the outgoing side of the circuit breaker body correspond one-to-one with the outgoing terminals. Loosening the screws in the screw holes allows the wiring to be removed. Tightening the screws in the screw holes on the incoming side of the circuit breaker body electrically connects the incoming wire to the incoming terminal. Tightening the screws in the screw holes on the outgoing side of the circuit breaker body electrically connects the outgoing wire to the outgoing terminal.

[0090] The intelligent circuit breaker in this embodiment uses the circuit of the intelligent circuit breaker as described in Embodiment 1.

[0091] In this embodiment, the data acquisition device 2 is detachably connected to the outgoing terminal of the circuit breaker body 3. The terminals of the data acquisition device 2 are inserted into the circuit breaker body 3 and electrically connected to the outgoing terminals of the circuit breaker body 3. The electronic module 1 is detachably connected to both the circuit breaker body 3 and the data acquisition device 2.

[0092] The data acquisition device 2 is used to collect various information such as voltage, current, temperature, and leakage current during the operation of the circuit breaker. The electronic module 1 is used to upload the data collected by the data acquisition device 2 to an external network device, and to receive and execute instructions issued by the external network device to operate the circuit breaker body 3 to perform opening and closing operations.

[0093] Furthermore, the data acquisition device 2 includes a bottom shell 21 and a cover plate 22. A phase current transformer 23 for detecting current is installed inside the bottom shell 21. The bottom shell 21 is provided with a through hole 214 for the outgoing or incoming line of the circuit breaker body 3 to pass through. A data acquisition board is installed inside the bottom shell 21. The current transformer is electrically connected to the data acquisition board. The data acquisition board is electrically connected with terminals corresponding one-to-one with the outgoing or incoming terminals of the circuit breaker body 3. The cover plate 22 is located at the upper end of the data acquisition board and is fixedly connected to the bottom shell 21. The cover plate 22 is provided with a first through hole 221 for the terminals and the outgoing or incoming line to pass through. The data acquisition board is provided with a through hole for the outgoing or incoming line to pass through.

[0094] In some embodiments, the terminals are welded and fixed to the data acquisition board. The terminals are plate-shaped. In some embodiments, when the smart circuit breaker is a single-phase circuit breaker, the data acquisition board is provided with an L terminal, an N terminal 254, and a PE terminal 255. A phase current transformer 23 is installed inside the bottom shell 21, corresponding to the L-phase outgoing or incoming line, and the phase current transformer 23 surrounds the outside of the through hole 214 corresponding to the L-phase outgoing or incoming line.

[0095] In other embodiments, when the intelligent circuit breaker is a three-phase circuit breaker, the data acquisition board is provided with A terminal 251, B terminal 252, C terminal 253, N terminal 254, and PE terminal 255. Three phase current transformers 23 are installed inside the bottom housing 21, corresponding to the A, B, and C phase outgoing or incoming lines respectively. The three phase current transformers 23 are respectively surrounding the through-holes 214 corresponding to the A, B, and C phase outgoing or incoming lines.

[0096] Furthermore, the bottom wall of the bottom shell 21 is provided with a first receiving groove 211 for accommodating the phase current transformer 23.

[0097] Furthermore, when the intelligent circuit breaker is a three-phase circuit breaker, a zero-sequence current transformer 24 is also installed inside the base shell 21. The zero-sequence current transformer 24 surrounds the three phase current transformers 23 and is electrically connected to the data acquisition board. In this embodiment, the zero-sequence current transformer 24 surrounds the three phase lines A, B, and C, as well as the neutral line N. In this embodiment, the zero-sequence current transformer surrounds the three phase outgoing lines A, B, and C, as well as the neutral line N.

[0098] The bottom wall of the bottom shell 21 is provided with a second receiving slot 212 for accommodating the zero-sequence current transformer 24.

[0099] Two wires are led out from the phase current transformer 23 and the zero-sequence current transformer 24, and are electrically connected to the data acquisition board through matching connectors. The data acquisition board is electrically connected to the main board through the data transmission interface 26, i.e., connector P4.

[0100] Furthermore, a hollow cylinder 213 is provided on the bottom wall of the bottom shell 21, corresponding one-to-one with the wire through hole 214 provided on the bottom wall of the bottom shell 21, and the hollow cylinder 213 communicates with the corresponding wire through hole 214. The diameter of the hollow cylinder 213 is the same as the diameter of the wire through hole 214.

[0101] In some embodiments, the bottom shell 21 includes a bottom wall and a first side wall extending upward from the edge of the bottom wall. The bottom wall and the first side wall are connected to form an open receiving cavity. The bottom wall of the bottom shell 21 has a second side wall extending upward. The second side wall is located outside the hollow cylinder 213 corresponding to the three-phase outgoing or incoming lines of A, B, and C or the L-phase outgoing or incoming line. A receiving slot for accommodating the phase current transformer 23 is formed between the second side wall and the corresponding hollow cylinder 213. The bottom wall of the bottom shell 21 has a third side wall and a fourth side wall extending upward. A receiving slot for accommodating the zero-sequence current transformer 24 is formed between the third side wall and the fourth side wall.

[0102] Furthermore, the first sidewall, second sidewall, third sidewall, and fourth sidewall are integrally formed with the bottom wall.

[0103] Furthermore, the bottom shell 21 is provided with a first connecting hole 215. The cover plate 22 is provided with a second connecting hole 224 corresponding to the first connecting hole 215.

[0104] Further, see Figure 6The data acquisition board is equipped with connectors, including a data transmission interface 26 (connector P4) and a power interface 27 (connector P3). The cover plate 22 has a second through hole 222 for the data transmission interface 26 to pass through and a third through hole 223 for the power interface 27 to pass through. The data acquisition board is equipped with resistors R7, R14, and R21, as well as capacitors C1, C2, and C3. Resistor R7 is connected in parallel with capacitor C1, resistor R14 is connected in parallel with capacitor C2, and resistor R21 is connected in parallel with capacitor C3. The first end of resistor R7 is electrically connected to the A-phase terminal via a first voltage divider unit. The second end of resistor R7, the second end of resistor R14, and the second end of resistor R21 are all grounded. The first end of resistor R14 is electrically connected to the B-phase terminal via the second voltage divider unit. The second end of resistor R14 is connected to the second ends of resistors R7 and R21. The first end of resistor R21 is electrically connected to the C-phase terminal via the third voltage divider unit. The second end of resistor R21 is connected to the second ends of resistors R7 and R14. The first end of resistor R7 is the A-phase voltage detection point, the first end of resistor R14 is the B-phase voltage detection point, and the first end of resistor R21 is the C-phase voltage detection point. The A-phase, B-phase, and C-phase voltage detection points are respectively connected to the data transmission interface 26 on the data acquisition board. The current transformer is connected to the data transmission interface 26 on the data acquisition board.

[0105] Furthermore, the first voltage divider unit, the second voltage divider unit, and the third voltage divider unit are all composed of at least one resistor connected in series.

[0106] Furthermore, a temperature detection circuit for detecting temperature is provided on the data acquisition board. A thermistor is disposed on the data acquisition board and located on the back of the terminal block for detecting the temperature of the terminal block.

[0107] Further, see Figure 7 The data acquisition device 2 also includes a rectifier board, on which a rectifier unit is provided. The input end of the rectifier unit is connected to the phase line, the output end of the rectifier unit is connected to one end of the second power resistor, and the other end of the second power resistor is connected to the power interface.

[0108] In some embodiments, the rectifier board is provided with a first rectifier unit, a second rectifier unit, and a third rectifier unit. The first end of the first rectifier unit is directly or via connector JP2 electrically connected to terminal A 251 on the data acquisition board. The first end of the second rectifier unit is directly or via connector JP4 electrically connected to terminal B 252 on the data acquisition board. The first end of the third rectifier unit is directly or via connector JP5 electrically connected to terminal C 253 on the data acquisition board. The second ends of the first rectifier unit, the second rectifier unit, and the third rectifier unit are all connected to one end of a second power resistor. The other end of the second power resistor is connected to a power interface.

[0109] The first rectifier unit, the second rectifier unit, and the third rectifier unit are each composed of at least one rectifier diode connected in series, with its positive terminal being the first terminal and its negative terminal being the second terminal.

[0110] The second end of at least one of the first rectifier unit, the second rectifier unit, and the third rectifier unit is connected to one end of the second power resistor, and the other end of the second power resistor is directly or via connector JP3 connected to the power interface 27, i.e., connector P3.

[0111] The data acquisition board and the rectifier board are electrically connected via connectors. For example, the through-hole pins on the data acquisition board can be inserted into the through-hole pins on the rectifier board, or vice versa, thus securing and electrically connecting the data acquisition board and the rectifier board.

[0112] The data acquisition board in this embodiment is equipped with through-hole pins JP1_1, JP2_1, JP3_1, JP4_1, and JP5_1. Through-hole pin JP1_1 is electrically connected to the second end of the test winding, through-hole pin JP2_1 is electrically connected to terminal A 251, through-hole pin JP3_1 is electrically connected to power interface 27, i.e., connector P3 (used to supply the voltage rectified by the rectifier board to power interface 27), through-hole pin JP4_1 is electrically connected to terminal B 252, and through-hole pin JP5_1 is electrically connected to terminal C 253.

[0113] The rectifier board is provided with through-holes JP1, JP2, JP3, JP4, and JP5. Through-hole JP1_1 is inserted into through-hole JP1, through-hole JP2_1 is inserted into through-hole JP2, through-hole JP3_1 is inserted into through-hole JP3, and through-hole JP4_1 is inserted into through-hole JP4.

[0114] The first end of the first rectifier unit is electrically connected to one end of the through-hole JP2 and one end of the first power resistor. The first end of the second rectifier unit is electrically connected to the through-hole JP4. The first end of the third rectifier unit is electrically connected to the through-hole JP5. The second ends of the first rectifier unit, the second ends of the second rectifier unit, and the second ends of the third rectifier unit are all connected to one end of the second power resistor. The other end of the first power resistor is electrically connected to the through-hole JP1. The second end of the first rectifier unit is connected to one end of the second power resistor, and the other end of the second power resistor is electrically connected to the through-hole JP3. The power supply interface 27, i.e., connector P3, is then connected via through-hole JP3 and through-hole pin JP3-1.

[0115] Of course, the circuitry on the rectifier board can also be placed on the data acquisition board.

[0116] Furthermore, the electronic module 1 includes an electronic housing comprising a left housing, a middle housing, and a right housing, which are detachably connected to form a mounting cavity within the electronic housing. A motherboard, a power board, and a panel are fixed to the electronic housing. The motherboard, power board, and panel can be installed within the mounting cavity.

[0117] See Figure 8 and Figure 9 The motherboard includes a main control chip, a metering chip, and an RS485 communication circuit. One end of the RS485 communication circuit is electrically connected to the main control chip, and the other end is connected to a communication interface. The input terminal of the metering chip is electrically connected to the voltage detection points (phase A, phase B, and phase C voltage detection points) and phase current transformers 23 (phase A, phase B, and phase C current transformers) on the data acquisition board. The output terminal of the metering chip is connected to the input terminal of the main control chip.

[0118] Furthermore, the motherboard is equipped with a storage module and a clock module, which are electrically connected to the main control chip.

[0119] Furthermore, the power supply board is equipped with a PE loop detection circuit, a PE disconnection detection circuit, and a trip control circuit.

[0120] Furthermore, the main control chip uses a processor.

[0121] Furthermore, the motherboard is equipped with a wireless communication interface for connecting to a wireless communication chip (wireless communication board). The wireless communication interface is connected to the main control chip. The motherboard is also equipped with a power board interface.

[0122] Furthermore, a wireless communication board (Internet of Things module) can also be fixed on the electronic housing, at which point the circuit breaker of the present invention will have wireless communication function.

[0123] A wireless communication chip is installed on the wireless communication board.

[0124] The IoT module in this embodiment may, but is not limited to, use a 4G IoT card.

[0125] When the circuit breaker is not equipped with a wireless communication board, the circuit breaker is electrically connected to a device with wireless communication capabilities (such as a circuit breaker with wireless communication capabilities or a separate gateway device) through a communication interface.

[0126] Furthermore, the electronic module 1 also includes an electric operating module for operating the circuit breaker body 3 to open and close.

[0127] The power board is equipped with a power supply circuit, which supplies power to the circuit breaker. The power supply circuit is as follows: Figure 14 As shown. The power supply circuit includes a first power supply unit, a second power supply unit, a third power supply unit, and a fourth power supply unit. The input terminal of the first power supply unit is connected to the power interface and is used to convert the voltage output from the power interface (the voltage output from the rectifier board) into a voltage HVDC. The second power supply unit is used to convert the HVDC voltage into a 12V voltage, the third power supply unit is used to convert the 12V voltage into a 5V voltage, and the fourth power supply unit is used to convert the 5V voltage into a 3.3V voltage (e.g., VDD3.3V).

[0128] A display circuit is disposed on the panel, and the panel is electrically connected to the motherboard. The display circuit includes a display screen, and the display circuit is as follows: Figure 15 As shown.

[0129] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An electrical circuit of an intelligent circuit breaker, characterized by: The circuit includes a main control circuit, a communication circuit, a power supply circuit, a trip control circuit, a leakage detection circuit, a PE line drop detection circuit, a PE loop detection circuit, a current detection circuit for detecting phase current, and a voltage detection circuit for detecting phase voltage. The power supply circuit is used to supply power to the current detection circuit, the voltage detection circuit, the leakage detection circuit, the PE line drop detection circuit, the PE loop detection circuit, the trip control circuit, the main control circuit, respectively. The current detection circuit is electrically connected to the first input terminal of the main control circuit. The voltage detection circuit is electrically connected to the second input terminal of the main control circuit. The leakage detection circuit is electrically connected to the third input terminal of the main control circuit. The PE line drop detection circuit is electrically connected to the fourth input terminal of the main control circuit. The PE loop detection circuit is electrically connected to the fifth input terminal of the main control circuit. The first output terminal of the main control circuit is electrically connected to the trip control circuit. The main control circuit is electrically connected to the communication circuit. The PE line drop detection circuit includes an optical coupler UO1. The anode of the diode of the optical coupler UO1 is connected to a first voltage through a resistor. The cathode of the diode of the optical coupler UO1 is connected to PE_IN. The collector of the triode of the optical coupler UO1 is connected to the first input terminal of the main control circuit, one end of resistor R11, and one end of capacitor C8, respectively. The other end of resistor R11 is connected to voltage VDD. The other end of capacitor C8 is grounded. The emitter of the triode of the optical coupler UO1 is grounded. PE_IN is connected to the ground. The PE loop detection circuit includes a current transformer T2 and an operational amplifier OPA. The first input terminal of the current transformer T2 is connected to the PE line. The second input terminal of the current transformer T2 is connected to the N line. The first output terminal of the current transformer T2 is connected to one end of resistor R4, one end of capacitor C2, the input terminal of the first filter circuit, and one end of the first clamping circuit, respectively. The other end of resistor R4 and the other end of capacitor C2 are grounded. The other end of the first clamping circuit is grounded. The output terminal of the first filter circuit is connected to the input terminal of the first amplifier. The output terminal of the first amplifier is connected to the input terminal CheckPE of the main control circuit.

2. The circuit of the intelligent circuit breaker of claim 1, wherein: The circuit further includes a display circuit which is electrically connected to the main control circuit. And / or, The circuit further includes an instruction input circuit which is electrically connected to the main control circuit. And / or, The circuit further includes a temperature detection circuit for detecting the internal temperature of the circuit breaker, which is electrically connected to the main control circuit.

3. The circuit of the intelligent circuit breaker of claim 1, wherein: The voltage detection circuit includes a metering chip and a voltage sampling circuit. The input terminal of the voltage sampling circuit is used to receive the phase voltage. The output terminal of the voltage sampling circuit is connected to the voltage measurement signal input terminal VAP of the metering chip. The output terminal of the metering chip is connected to the main control circuit.

4. The circuit of the intelligent circuit breaker of claim 3, wherein: The current detection circuit comprises phase current transformers for detecting phase currents, one end of the phase current transformers is connected with one end of resistor R19 and one end of resistor R23 respectively, the other end of resistor R19 is connected with current measurement signal input end IAP of the metering chip and one end of capacitor C28 respectively, the other end of resistor R23 and the other end of capacitor C28 are grounded, the other end of the phase current transformers is connected with one end of resistor R25 and one end of resistor R24 respectively, the other end of resistor R25 is connected with current measurement signal input end IAN of the metering chip and one end of capacitor C32 respectively, the other end of resistor R24 and the other end of capacitor C32 are grounded, and the output end of the metering chip is connected with the main control circuit.

5. The circuit of the intelligent circuit breaker of claim 1, wherein: The leakage detection circuit comprises a zero sequence current transformer, one end of the zero sequence current transformer is connected with one end of resistor R41, one end of capacitor C44, the input end of the second filter circuit and one end of the second clamping circuit respectively, the other end of resistor R41 and the other end of capacitor C44 are grounded, the other end of the second clamping circuit is grounded, the output end of the second filter circuit is connected with the input end of the second amplifier, and the output end of the second amplifier is connected with the input end LeakCurrent of the main control circuit.

6. The circuit of the intelligent circuit breaker of claim 5, wherein: The test winding is connected with one end of the first power resistor, the other end of the first power resistor is connected with a phase line, and the other end of the test winding is grounded through a test switch device, and the zero sequence current transformer can detect a current signal when the test winding is powered.

7. The circuit of the intelligent circuit breaker of claim 6, wherein: The test winding and the zero sequence current transformer are wound on the same magnetic ring.

8. The circuit of the intelligent circuit breaker of claim 1, wherein: The communication circuit comprises an RS485 communication circuit, the RS485 communication circuit comprises an isolator chip U6 and an RS485 communication chip, the isolator chip U6 is connected between the RS485 communication chip and the main control circuit, and the RS485 communication chip is connected with a communication interface. Or / and, The communication circuit comprises a wireless communication chip, and the wireless communication chip is connected with the main control circuit.

9. An intelligent circuit breaker comprising: The circuit adopts the intelligent circuit breaker as claimed in any one of claims 1 to 8.

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