Data acquisition circuit of intelligent circuit breaker and intelligent circuit breaker

Abstract

The utility model discloses a data acquisition circuit of an intelligent circuit breaker and the intelligent circuit breaker, comprising an electric leakage detection circuit, a current detection circuit used for detecting phase current and a voltage detection circuit used for detecting phase voltage, the first end of the first current transformer is connected with the input end of the first filter circuit and one end of the first clamping circuit, the second end of the first current transformer is grounded, the other end of the first clamping circuit is grounded, and the output end of the first filter circuit is connected with the input end of the first amplifier. The output end of the first amplifier is the output end of the electric leakage detection circuit. The data acquisition circuit is used for acquiring various kinds of information such as voltage, current, temperature, electric leakage amount and the like in the working process of the circuit breaker, and power utilization faults can be judged.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a data acquisition circuit and an intelligent circuit breaker for an intelligent circuit breaker. Background Art

[0002] At present, with the popularization of electrical appliances, the problem of electrical safety is prominent. For example, electrical leakage and electrical appliance burnout causing fires, etc., the circuit safety situation is severe. Traditional circuit breakers do not have a data acquisition function, and the circuit safety protection scheme of traditional circuit breakers is backward. They cannot detect circuit safety problems in time. At the same time, in terms of triggering power-off, it usually requires manual operation or power-off is achieved by fusing a fuse. Such management methods cannot cut off the power accurately and in time to protect the life and property safety of users.

[0003] Therefore, there is an urgent need in this field to design a data acquisition circuit for an intelligent circuit breaker. Summary of the Utility Model <000001*0*>The utility model aims to at least solve one of the technical problems existing in the prior art, and provides a data acquisition circuit and an intelligent circuit breaker for an intelligent circuit breaker.

[0005] The technical solution of the utility model is realized as follows: The utility model discloses a data acquisition circuit for an intelligent circuit breaker, including a leakage detection circuit. The leakage detection circuit includes a first current transformer. The first end of the first current transformer is respectively connected to the input end of a first filtering circuit and one end of a first clamping circuit. The second end of the first current transformer is grounded. The other end of the first clamping circuit is grounded. The output end of the first filtering circuit is connected to the input end of a first amplifier. The output end of the first amplifier is the output end of the leakage detection circuit.

[0006] Further, the leakage detection circuit further includes a resistor R41 and a capacitor C44. One end of the resistor R41 is connected to the first end of the first current transformer, and the other end of the resistor R41 is grounded. One end of the capacitor C44 is connected to the first end of the first current transformer, and the other end of the capacitor C44 is grounded.

[0007] Further, the first clamping circuit includes a double series switch diode D2. The first pole of the double series switch diode D2 is connected to the first end of the first current transformer, and the second and third poles of the double series switch diode D2 are grounded;

[0008] And / or,

[0009] Note: In the provided text, there is a potential error in the tag

[0004] which is likely

[0004] in the original Chinese. I have translated it as <000001*0*> in the English version to show the possible error. It should be corrected to the correct tag number in the actual text. Also, the - and -

[0009] tags seem to be some kind of internal identifiers or have no semantic meaning for translation other than preservation. If there are specific rules or meanings associated with these tags that are not clear from the given text, the translation might need to be adjusted accordingly.The first filter circuit includes a resistor R37, a resistor R38, and a capacitor C45. One end of the resistor R37 is connected to the first end of the first current transformer. The other end of the resistor R37 is respectively connected to one end of the capacitor C45 and one end of the resistor R38. The other end of the capacitor C45 is grounded. The other end of the resistor R38 is connected to the negative input terminal of the first amplifier.

[0010] and / or,

[0011] The first amplifier includes an operational amplifier U2. The positive input terminal of the operational amplifier U2 is grounded. The negative input terminal of the operational amplifier U2 is connected to the output terminal of the first filter circuit. The negative input terminal of the operational amplifier U2 is connected to one end of a resistor R34. The other end of the resistor R34 is connected to the output terminal of the operational amplifier U2.

[0012] Further, the leakage detection circuit further includes an inductor L2. One end of the inductor L2 is connected to the output terminal of the first amplifier. The other end of the inductor L2 is the output terminal of the leakage detection circuit.

[0013] and / or,

[0014] The leakage detection circuit further includes a resistor R42. One end of the resistor R42 is connected to the output terminal of the leakage detection circuit. The other end of the resistor R42 is grounded.

[0015] and / or,

[0016] The leakage detection circuit further includes a capacitor C46. One end of the capacitor C46 is connected to the output terminal of the leakage detection circuit. The other end of the capacitor C46 is grounded.

[0017] and / or,

[0018] The output terminal of the leakage detection circuit is used to be connected to the main control circuit.

[0019] Further, the first current transformer is a zero-sequence current transformer. The first current transformer surrounds the outside of the three-phase lines A, B, C, and the neutral line N.

[0020] Further, the data acquisition circuit of the intelligent circuit breaker of the present utility model further includes a current detection circuit. The current detection circuit includes a phase current transformer. 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. The output terminal of the metering chip is used to be connected to the main control circuit.

[0021] and / or,

[0022] The data acquisition circuit of the intelligent circuit breaker of the present utility model further includes a voltage detection circuit. The voltage detection circuit includes a voltage sampling circuit. The input end of the voltage sampling circuit is used to receive the phase voltage. The output end of the voltage sampling circuit is connected to the voltage measurement signal input end of the metering chip. The output end of the metering chip is used to be connected to the main control circuit.

[0023] Further, the data acquisition circuit of the intelligent circuit breaker of the present utility model further includes a temperature detection circuit for detecting the internal temperature of the circuit breaker. The temperature detection circuit is used to be electrically connected to the main control circuit.

[0024] Further, the data acquisition circuit of the intelligent circuit breaker of the present utility model further includes a PE disconnection detection circuit. The PE disconnection detection circuit includes an optocoupler UO1. The anode of the diode of the optocoupler UO1 is connected to the first voltage through a resistor. The cathode of the diode of the optocoupler UO1 is connected to PE_IN. The collector of the triode of the optocoupler UO1 is respectively connected to the first input end of the main control circuit, one end of a resistor R11, and one end of a 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 emitter of the triode of the optocoupler UO1 is grounded. PE_IN is connected to the ground.

[0025] Further, the data acquisition circuit of the intelligent circuit breaker of the present utility model further includes a PE loop detection circuit. The PE loop detection circuit includes a second current transformer and an operational amplifier OPA. The first input end of the second current transformer is connected to the PE line. The second input end of the second current transformer is connected to the N line. The first output end of the second current transformer is respectively connected to one end of a resistor R4, one end of a capacitor C2, the input end of a second filter circuit, and one end of a second clamping circuit. The other end of the resistor R4 and the other end of the capacitor C2 are grounded. The other end of the second clamping circuit is grounded. The output end of the second filter circuit is connected to the input end of a second amplifier. The output end of the second amplifier is used to be connected to the input end CheckPE of the main control circuit.

[0026] Compared with the prior art, the present utility model has the following beneficial effects: The data acquisition circuit of the present utility model is used to collect various information such as voltage, current, temperature, and leakage power during the operation of the circuit breaker. By real-time monitoring of various information such as voltage, current, temperature, and leakage power during the operation of the circuit breaker, electrical faults can be judged, and when an electrical fault occurs, the circuit breaker body can be manipulated to trip, which is convenient for protecting the life and property safety of users.

[0027] The power usage status of the construction electricity carrier distribution box can also be monitored in real time through the circuit breaker. When there is a risk of electrical faults, an alarm is sent to the management personnel in real time, and the electrical risk fault points are searched in time for maintenance to eliminate safety risks. Description of the Drawings

[0028] Figure 1 Structural schematic diagram of the intelligent circuit breaker provided by the embodiment of the present utility model;

[0029] Figure 2 Structural schematic diagram of the data acquisition device of the intelligent circuit breaker provided by the embodiment of the present utility model;

[0030] Figure 3 Structural schematic diagram of the bottom case and cover plate of the data acquisition device of the intelligent circuit breaker provided by the embodiment of the present utility model;

[0031] Figure 4 Structural schematic diagram of the bottom case of the data acquisition device of the intelligent circuit breaker provided by the embodiment of the present utility model;

[0032] Figure 5 Installation schematic diagram of the phase current transformer and the first current transformer provided by the embodiment of the present utility model;

[0033] Figure 6 Circuit diagram of the data acquisition board provided by the embodiment of the present utility model;

[0034] Figure 7 Circuit diagram of the rectifier board provided by the embodiment of the present utility model;

[0035] Figure 8 Circuit diagram of the main control circuit part of the main board provided by the embodiment of the present utility model;

[0036] Figure 9 Circuit diagram of the metering chip part of the main board provided by the embodiment of the present utility model;

[0037] Figure 10 Circuit diagram of the RS485 communication circuit provided by the embodiment of the present utility model;

[0038] Figure 11 Circuit diagram of the trip control circuit provided by the embodiment of the present utility model;

[0039] Figure 12 Circuit diagram of the PE loop detection circuit provided by the embodiment of the present utility model;

[0040] Figure 13 Circuit diagram of the PE disconnection detection circuit provided by the embodiment of the present utility model;

[0041] Figure 14 Circuit diagram of the power supply circuit provided by the embodiment of the present utility model;

[0042] Figure 15 Circuit diagram of the display circuit provided by the embodiment of the present utility model;

[0043] Figure 16 This is the circuit diagram of the leakage detection circuit provided by the embodiment of the present utility model.

[0044] In the attached drawings, 1 is an electronic module, 2 is a data acquisition device, 21 is a bottom case, 211 is a first accommodation groove, 212 is a second accommodation groove, 213 is a hollow cylinder, 214 is a wire passing through hole, 215 is a first connection hole, 22 is a cover plate, 221 is a first through hole, 222 is a second through hole, 223 is a third through hole, 224 is a second connection hole, 23 is a phase current transformer, 24 is a zero-sequence current transformer, 251 is an A terminal, 252 is a B terminal, 253 is a C terminal, 254 is an N terminal, 255 is a PE terminal, 26 is a data transmission interface, 27 is a power supply interface, and 3 is a circuit breaker body. Detailed implementation manners

[0045] To enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further described in detail below with reference to the attached drawings and specific implementation manners.

[0046] Unless otherwise defined, the technical terms or scientific terms used in the present utility model shall have the ordinary meanings understood by those of ordinary skill in the field to which the present utility model belongs. The "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a", "one" or "the" do not denote a quantity limitation, but mean that there is at least one. The terms such as "comprising" or "including" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] In each of the attached drawings, the same elements are denoted by similar reference numerals. For the sake of clarity, not all parts in the drawings are drawn to scale. In addition, some well-known parts may not be shown in the figures.

[0048] In the following text, many specific details of the present utility model are described, such as the structure, materials, dimensions, processing techniques and technologies of components, in order to better understand the present utility model. However, as those skilled in the art can understand, the present utility model can be implemented without these specific details.

[0049] Embodiment 1

[0050] An embodiment of the present utility model discloses a data acquisition circuit for an intelligent circuit breaker, including a leakage detection circuit. Refer to Figure 16 , the leakage detection circuit includes a first current transformer. The first end of the first current transformer is respectively connected to the input end of a first filter circuit and one end of a first clamping circuit. The second end of the first current transformer is grounded, and the other end of the first clamping circuit is grounded. The output end of the first filter circuit is connected to the input end of a first amplifier. The output end of the first amplifier is the output end of the leakage detection circuit, which is used to be connected to the input end LeakCurrent of the main control circuit.

[0051] Further, the leakage detection circuit further includes a resistor R41 and a capacitor C44. One end of the resistor R41 is connected to the first end of the first current transformer, and the other end of the resistor R41 is grounded. One end of the capacitor C44 is connected to the first end of the first current transformer, and the other end of the capacitor C44 is grounded.

[0052] Further, the first clamping circuit includes a double series switch diode D2. The first pole of the double series switch diode D2 is connected to the first end of the first current transformer, and the second and third poles of the double series switch diode D2 are grounded.

[0053] Further, the first filter circuit includes a resistor R37, a resistor R38 and a capacitor C45. One end of the resistor R37 is connected to the first end of the first current transformer. The other end of the resistor R37 is respectively connected to one end of the capacitor C45 and one end of the resistor R38. The other end of the capacitor C45 is grounded, and the other end of the resistor R38 is connected to the negative input end of the first amplifier.

[0054] Further, the first amplifier includes an operational amplifier U2. The positive input end of the operational amplifier U2 is grounded. The negative input end of the operational amplifier U2 is connected to the output end of the first filter circuit. The negative input end of the operational amplifier U2 is connected to one end of a resistor R34, and the other end of the resistor R34 is connected to the output end of the operational amplifier U2.

[0055] Further, the leakage detection circuit further includes an inductor L2. One end of the inductor L2 is connected to the output end of the first amplifier, and the other end of the inductor L2 is the output end of the leakage detection circuit.

[0056] Further, the leakage detection circuit further includes a resistor R42. One end of the resistor R42 is connected to the output end of the leakage detection circuit, and the other end of the resistor R42 is grounded.

[0057] Further, the leakage detection circuit further includes a capacitor C46. One end of the capacitor C46 is connected to the output end of the leakage detection circuit, and the other end of the capacitor C46 is grounded.

[0058] Further, the first current transformer is a zero-sequence current transformer, and the first current transformer surrounds the outside of the three-phase lines A, B, C and the neutral line N.

[0059] Further, the data acquisition circuit of the intelligent circuit breaker of the present invention further includes a current detection circuit. The current detection circuit includes a phase current transformer for detecting phase current. The phase current transformer is connected to the input end of the current sampling circuit, and the output end of the current sampling circuit is connected to the current measurement signal input end of the metering chip. The output end of the metering chip is used to be connected to the main control circuit.

[0060] Further, the data acquisition circuit of the intelligent circuit breaker of the present invention further includes a voltage detection circuit. The voltage detection circuit includes a voltage sampling circuit. The input end of the voltage sampling circuit is used to receive phase voltage, and the output end of the voltage sampling circuit is connected to the voltage measurement signal input end of the metering chip. The output end of the metering chip is used to be connected to the main control circuit.

[0061] The current detection circuit of this embodiment is used to detect the phase currents on the outgoing side of the intelligent circuit breaker.

[0062] The voltage detection circuit of this embodiment is used to detect the phase voltages on the outgoing side of the intelligent circuit breaker.

[0063] 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 A, B, C of the circuit breaker and transmit them to the metering chip.

[0064] In some embodiments, the current detection circuit includes a current sampling circuit and a metering chip. The current sampling circuit is used to collect the three-phase currents A, B, C of the circuit breaker and transmit them to the metering chip.

[0065] The metering chip is used to convert electrical signals such as current and voltage into signals that the main control circuit can read.

[0066] The input end of the voltage sampling circuit is used to receive phase voltage. The output end of the voltage sampling circuit is connected to the voltage measurement signal input end VAP of the metering chip, and the output end of the metering chip is connected to the main control circuit.

[0067] The voltage measurement signal input end VAN of the metering chip is connected to one end of the resistor R20. The other end of the resistor R20 is grounded, and a capacitor C29 is connected in parallel at both ends of the resistor R20.

[0068] The voltage sampling circuit includes a voltage dividing unit and a resistor R7. One end of the voltage dividing unit is used to receive phase voltage. The other end of the voltage dividing unit is respectively connected to the voltage measurement signal input end 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 at both ends of the resistor R7.

[0069] In some embodiments, the voltage sampling circuit includes resistor R7, resistor R14, and resistor R21, as well as capacitor C1, capacitor C2, and capacitor C3. Resistor R7 is in parallel with capacitor C1, resistor R14 is in parallel with capacitor C2, and resistor R21 is in parallel with capacitor C3. The first end of resistor R7 is electrically connected to the A-phase line through a first voltage dividing 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 line through a second voltage dividing unit. The first end of resistor R21 is electrically connected to the C-phase line through a third voltage dividing unit. 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 voltage detection point, the B-phase voltage detection point, and the C-phase voltage detection point 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 utility model is not limited to the above embodiments, and other voltage sampling circuits can also be adopted.

[0070] In some embodiments, taking the A-phase as an example, the current sampling circuit includes resistor R19, resistor R23, resistor R24, resistor R25, as well as capacitor C28 and capacitor C32. One end of the phase current transformer is respectively connected to one end of resistor R19 and one end of resistor R23. The other end of resistor R19 is respectively connected to the current measurement signal input terminal IAP of the metering chip and one end of capacitor C28. The other end of resistor R23 and the other end of capacitor C28 are grounded. The other end of the phase current transformer is respectively connected to one end of resistor R25 and one end of resistor R24. The other end of resistor R25 is respectively connected to the current measurement signal input terminal IAN of the metering chip and one end of capacitor C32. 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.

[0071] Furthermore, the data acquisition circuit of the intelligent circuit breaker of the present utility model further includes a temperature detection circuit for detecting the internal temperature of the circuit breaker, and the temperature detection circuit is used to be electrically connected to the main control circuit.

[0072] Further, the temperature detection circuit uses a thermistor. The temperature detection circuit includes a thermistor. One end of the thermistor is respectively connected to one end of resistor R23 and one end of resistor R24. The other end of resistor R23 is connected to the supply voltage VCC. The other end of resistor R24 is connected to the data transmission interface 26, i.e., connector P4, and is connected to the AD sampling port of the main control chip (the main control chip is the MCU on the main board) through connector P4. The other end of resistor R24 is connected to one end of capacitor C4. 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.

[0073] Further, the data acquisition circuit of the intelligent circuit breaker of the present invention further includes a PE loop detection circuit. The PE loop detection circuit includes a second current transformer T2 and an operational amplifier OPA. The first input terminal of the second current transformer is connected to the PE line. The second input terminal of the second current transformer is connected to the N line. The first output terminal of the second current transformer is respectively connected to one end of resistor R4, one end of capacitor C2, the input terminal of the second filter circuit, and one end of the second clamping circuit. The other end of resistor R4 and the other end of capacitor C2 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. The output terminal of the second amplifier is used to be connected to the input terminal CheckPE of the main control circuit.

[0074] In some embodiments, the PE loop detection circuit includes a second current transformer and an operational amplifier OPA. The first input terminal of the second current transformer is connected to the PE outlet side PE_OUT (the PE outlet side PE_OUT is connected to the circuit breaker housing). The second input terminal of the second current transformer is connected to the N line PE_C. The first output terminal of the second current transformer is respectively connected to one end of resistor R4, one end of capacitor C2, one end of resistor R2, and the first pole of the double series switch diode D1. The other end of resistor R4 and the other end of capacitor C2 are grounded. The second pole and the third pole of the double series switch diode D1 are grounded. The other end of resistor R2 is respectively connected to one end of capacitor C3 and one end of resistor R3. The other end of capacitor C3 is grounded. The other end of resistor R3 is connected to the negative input terminal of the operational amplifier U1. The negative input terminal of the operational amplifier U1 is connected to one end of resistor R1. The other end of resistor R1 is connected to the output terminal of the operational amplifier. The positive input terminal of the operational amplifier U1 is grounded. The output terminal of the operational amplifier U1 is connected to one end of the inductor L1. The other end of the inductor L1 is respectively connected to one end of resistor R6, one end of capacitor C5, and the input terminal CheckPE of the main control circuit. The other end of resistor R6 and the other end of capacitor C5 are grounded.

[0075] The second clamping circuit includes a double series switch diode D1, and the function of the double series switch diode D1 is to clamp the voltage to a set value.

[0076] The resistor R2, the resistor R3 and the capacitor C3 form a filtering circuit.

[0077] The PE loop detection circuit of the present utility model can be used for monitoring the water ingress of a circuit breaker. When the circuit breaker gets water ingress, the second current transformer can detect a current signal. The PE loop detection circuit of the present utility model can also detect electric leakage.

[0078] Further, referring to Figure 13 , the data acquisition circuit of the intelligent circuit breaker of the present utility model further includes a PE disconnection detection circuit. The PE disconnection detection circuit includes an optocoupler UO1. The anode of the diode of the optocoupler UO1 is connected to the first voltage HVDC through a resistor, the cathode of the diode of the optocoupler UO1 is connected to PE_IN, the collector of the triode of the optocoupler UO1 is respectively connected to the first input end 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 emitter of the triode of the optocoupler UO1 is grounded, and PE_IN is connected to the ground.

[0079] The PE disconnection detection circuit is used to detect whether the 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 the ground, CheckPE_Leak is the high and low level signal output by the optocoupler and sent to the MCU; when PE_IN is well grounded, there is a DC voltage of about 300V between HVDC and PE_IN, the optocoupler is turned on, and CheckPE_Leak is at a low level, otherwise it is at a high level; the MCU judges whether PE_IN is connected to the ground by detecting the high and low levels of CheckPE_Leak.

[0080] Embodiment 2

[0081] An embodiment of the present utility model also discloses an intelligent circuit breaker, which includes a main control circuit, a communication circuit, a power supply circuit, a tripping control circuit and a data acquisition circuit. The power supply circuit is used to supply power to the data acquisition circuit, the tripping control circuit and the main control circuit respectively. The data acquisition circuit is connected to the input end of the main control circuit, and the output end of the main control circuit is connected to the tripping control circuit.

[0082] Further, the current detection circuit is electrically connected to the first input end of the main control circuit, the voltage detection circuit is electrically connected to the second input end of the main control circuit, the electric leakage detection circuit is electrically connected to the third input end of the main control circuit, the first output end of the main control circuit is electrically connected to the tripping control circuit, and the main control circuit is electrically connected to the communication circuit.

[0083] Further, the circuit of the intelligent circuit breaker of the present utility model further includes a display circuit, and the display circuit is electrically connected to the main control circuit.

[0084] Further, the circuit of the intelligent circuit breaker of the present utility model further includes an instruction input circuit, and the instruction input circuit is electrically connected to the main control circuit.

[0085] Further, the circuit of the intelligent circuit breaker of the present utility model further includes a test winding. One end of the test winding is connected to one end of a first power resistor, the other end of the first power resistor is electrically connected to a phase wire, and the other end of the test winding is grounded through a test switch device. When the test winding is energized, the first current transformer can detect a current signal. When the test switch device is closed, the test winding is energized. At this time, the first current transformer can detect a current signal and transmit it to the main control circuit, and the main control circuit controls the circuit breaker to trip, so as to detect whether the circuit breaker can perform a tripping operation.

[0086] Further, the test winding and the first current transformer are wound on the same magnetic ring.

[0087] Further, the circuit of the intelligent circuit breaker of the present utility model further includes a rectification unit. The input end of the rectification unit is connected to the phase wire, the output end of the rectification unit is connected to one end of a second power resistor, and the other end of the second power resistor is connected to the power supply interface.

[0088] In some embodiments, the circuit of the intelligent circuit breaker further includes a first rectification unit, a second rectification unit, and a third rectification unit. The first end of the first rectification unit is electrically connected to the A phase wire, the first end of the second rectification unit is electrically connected to the B phase wire, the first end of the third rectification unit is electrically connected to the C phase wire, the second end of the first rectification unit, the second end of the second rectification unit, and the second end of the third rectification unit are connected to one end of the second power resistor, and the other end of the second power resistor is connected to the power supply interface.

[0089] The first rectification unit, the second rectification unit, and the third rectification unit are each composed of at least one series-connected rectifier diode, with its positive pole being the first end and its negative pole being the second end.

[0090] Further, the communication circuit includes a wired communication circuit, and the wired communication circuit is connected to the main control circuit.

[0091] Further, the wired communication circuit is an RS485 communication circuit. The 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 circuit, and the RS485 communication chip is connected to the communication interface.

[0092] Further, the communication circuit includes a wireless communication chip, and the wireless communication chip is electrically connected to the main control circuit.

[0093] Further, referring to Figure 10 , the 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.

[0094] Further, a 485 isolated power supply circuit is provided on the main board. The 485 isolated power supply circuit includes an isolated power supply module MUX1. The input end of the isolated power supply module MUX1 is connected to a first voltage, and the output end of the isolated power supply module MUX1 outputs a second voltage for supplying power to the RS485 communication chip.

[0095] Referring to Figure 11 , the trip control circuit includes a driver chip U3 and a triode MOS1. The input end of the driver chip U3 is connected to the output end of the main control circuit, the output end of the driver chip U3 is connected to the control pole of the triode MOS1. The first pole of the triode MOS1 is grounded, the second pole of the triode MOS1 is connected to the second pin of the connector J4 and the positive pole of the diode D6, and the negative pole of the diode D6 is connected to the first voltage HVDC and the first pin of the connector J4.

[0096] The connector J4 is connected to the electric operation module. The trip control circuit is used to control the power on or off of the electric operation module and to control the intelligent circuit breaker to trip. The electric operation module can be, but is not limited to, an electromagnet.

[0097] Embodiment III

[0098] Referring to Figures 1 to 16 , an embodiment of the present utility model 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. The terminal of the data acquisition device 2 is inserted into the circuit breaker body 3 and is electrically connected to the outgoing line terminal or the incoming line terminal of the circuit breaker body. Screw holes for fixing wires (wiring) are provided on both the incoming side and the outgoing side of the circuit breaker body. The screw holes on the incoming side of the circuit breaker body correspond one-to-one to the incoming line terminals. The screw holes on the outgoing side of the circuit breaker body correspond one-to-one to the outgoing line terminals. Loosening the screws in the screw holes can remove the wiring. Tightening the screws in the screw holes on the incoming side of the circuit breaker body can electrically connect the incoming line on the incoming side of the circuit breaker body to the incoming line terminal. Tightening the screws in the screw holes on the outgoing side of the circuit breaker body can electrically connect the outgoing line on the outgoing side of the circuit breaker body to the outgoing line terminal.

[0099] The intelligent circuit breaker of this embodiment adopts the circuit of the intelligent circuit breaker as described in Embodiment II.

[0100] The data acquisition device 2 of this embodiment is detachably connected to the outgoing line end of the circuit breaker body 3. The terminal of the data acquisition device 2 is inserted into the circuit breaker body 3 and is electrically connected to the outgoing line terminal of the circuit breaker body 3. The electronic module 1 is detachably connected to the circuit breaker body 3 and the data acquisition device 2 respectively.

[0101] 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 networked device, and receive and execute the instructions issued by the external networked device to control the circuit breaker body 3 to perform opening and closing operations.

[0102] Further, the data acquisition device 2 includes a bottom case 21 and a cover plate 22. A phase current transformer 23 for detecting current is installed in the bottom case 21. A wire passing through hole 214 for the outgoing line or incoming line of the circuit breaker body 3 to pass through is provided on the bottom case 21. A data acquisition board is installed in the bottom case 21. The current transformer is electrically connected to the data acquisition board. Terminals corresponding one by one to the outgoing line terminals or incoming line terminals of the circuit breaker body 3 are electrically connected to the data acquisition board. The cover plate 22 is located above the data acquisition board and is fixedly connected to the bottom case 21. A first through hole 221 for the terminals and the outgoing line or incoming line to pass through is provided on the cover plate 22. A through hole for the outgoing line or incoming line to pass through is provided on the data acquisition board.

[0103] In some embodiments, the terminals are fixedly welded to the data acquisition board. The terminals are in sheet form. In some embodiments, when the intelligent circuit breaker is a single-phase circuit breaker, an L terminal, an N terminal 254, and a PE terminal 255 are provided on the data acquisition board. One phase current transformer 23 is installed in the bottom case 21, corresponding to the L-phase outgoing line or incoming line. The phase current transformer 23 surrounds the outside of the wire passing through hole 214 corresponding to the L-phase outgoing line or incoming line.

[0104] In other embodiments, when the intelligent circuit breaker is a three-phase circuit breaker, an A terminal 251, a B terminal 252, a C terminal 253, an N terminal 254, and a PE terminal 255 are provided on the data acquisition board. Three phase current transformers 23 are installed in the bottom case 21, corresponding to the A, B, and C phase outgoing lines or incoming lines respectively. The three phase current transformers 23 respectively surround the outside of the wire passing through holes 214 corresponding to the A, B, and C phase outgoing lines or incoming lines.

[0105] Further, a first accommodation groove 211 for accommodating the phase current transformer 23 is provided on the bottom wall of the bottom case 21.

[0106] Further, when the intelligent circuit breaker is a three-phase circuit breaker, a first current transformer 24 is also installed in the bottom case 21. The first current transformer 24 surrounds the outside of the three phase current transformers 23, and the first current transformer 24 is electrically connected to the data acquisition board. In this embodiment, the first current transformer 24 of this embodiment surrounds the outside of the three-phase lines A, B, C and the neutral line N. The first current transformer of this embodiment surrounds the outside of the outgoing lines of the three phases A, B, C and the outgoing line of the neutral line N.

[0107] A second accommodation groove 212 for accommodating the first current transformer 24 is provided on the bottom wall of the bottom case 21.

[0108] The phase current transformer 23 and the first current transformer 24 lead out two wires and are electrically connected to the data acquisition board through a matching connector. The data acquisition board is electrically connected to the main board through the data transmission interface 26, i.e., the connector P4.

[0109] Further, a hollow cylinder 213 is provided on the bottom wall of the bottom case 21, which corresponds to the wire passing through hole 214 provided on the bottom wall of the bottom case 21 one by one, and the hollow cylinder 213 communicates with the corresponding wire passing through hole 214. The aperture of the hollow cylinder 213 is the same as that of the wire passing through hole 214.

[0110] In some embodiments, the bottom case 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 enclose an open accommodation cavity. A second side wall extends upward from the bottom wall of the bottom case 21. The second side wall is located outside the hollow cylinder 213 corresponding to the outgoing or incoming lines of the three phases A, B, C or the outgoing or incoming line of the L phase. A accommodation groove for accommodating the phase current transformer 23 is formed between the second side wall and the corresponding hollow cylinder 213. A third side wall and a fourth side wall extend upward from the bottom wall of the bottom case 21. A accommodation groove for accommodating the zero-sequence current transformer 24 is formed between the third side wall and the fourth side wall.

[0111] Further, the first side wall, the second side wall, the third side wall, the fourth side wall and the bottom wall are integrally formed.

[0112] Further, a first connection hole 215 is provided on the bottom case 21. A second connection hole 224 corresponding to the first connection hole 215 is provided on the cover plate 22.

[0113] Further, refer to Figure 6, a connector is provided on the data acquisition board, including a data transmission interface 26, i.e., connector P4, and a power supply interface 27, i.e., connector P3. A second through-hole 222 for the data transmission interface 26 to pass through and a third through-hole 223 for the power supply interface 27 to pass through are provided on the cover plate 22. A resistor R7, a resistor R14, a resistor R21, a capacitor C1, a capacitor C2, and a capacitor C3 are provided on the data acquisition board. The resistor R7 is connected in parallel with the capacitor C1, the resistor R14 is connected in parallel with the capacitor C2, and the resistor R21 is connected in parallel with the capacitor C3. The first end of the resistor R7 is electrically connected to the A-phase terminal through a first voltage dividing unit. The second end of the resistor R7, the second end of the resistor R14, and the second end of the resistor R21 are all grounded. The first end of the resistor R14 is electrically connected to the B-phase terminal through a second voltage dividing unit. The second end of the resistor R14 is connected to the second end of the resistor R7 and the second end of the resistor R21. The first end of the resistor R21 is electrically connected to the C-phase terminal through a third voltage dividing unit. The second end of the resistor R21 is connected to the second end of the resistor R7 and the second end of the resistor R14. The first end of the resistor R7 is the A-phase voltage detection point, the first end of the resistor R14 is the B-phase voltage detection point, and the first end of the resistor R21 is the C-phase voltage detection point. The A-phase voltage detection point, the B-phase voltage detection point, and the C-phase voltage detection point are respectively connected to the data transmission interface 26 provided on the data acquisition board. The current transformer is connected to the data transmission interface 26 provided on the data acquisition board.

[0114] Further, each of the first voltage dividing unit, the second voltage dividing unit, and the third voltage dividing unit is formed by at least one resistor connected in series.

[0115] Further, a temperature detection circuit for detecting temperature is provided on the data acquisition board. A thermistor is provided on the data acquisition board and is located on the back of the terminal for detecting the temperature of the terminal.

[0116] Further, referring to Figure 7 , the data acquisition device 2 further includes a rectifying board. A rectifying unit is provided on the rectifying board. The input end of the rectifying unit is connected to the phase line, and the output end of the rectifying unit is connected to one end of a second power resistor. The other end of the second power resistor is connected to the power supply interface.

[0117] In some embodiments, a first rectification unit, a second rectification unit, and a third rectification unit are provided on the rectification board. A first end of the first rectification unit is directly or electrically connected to a terminal A251 on the data acquisition board via a connector JP2. A first end of the second rectification unit is directly or electrically connected to a terminal B252 on the data acquisition board via a connector JP4. A first end of the third rectification unit is directly or electrically connected to a terminal C253 on the data acquisition board via a connector JP5. A second end of the first rectification unit, a second end of the second rectification unit, and a second end of the third rectification unit are all connected to one end of a second power resistor, and the other end of the second power resistor is connected to a power supply interface.

[0118] The first rectification unit, the second rectification unit, and the third rectification unit are each composed of at least one series-connected rectifier diode, with its positive pole being the first end and its negative pole being the second end.

[0119] A second end of at least one of the first rectification unit, the second rectification unit, and the third rectification unit is connected to one end of a second power resistor, and the other end of the second power resistor is directly or connected to the power supply interface 27, i.e., connector P3, via a connector JP3.

[0120] The data acquisition board and the rectification board are electrically connected through a connector. For example, the straight pins on the data acquisition board are inserted and mated with the straight pin holes on the rectification board, or the straight pin holes on the data acquisition board are inserted and mated with the straight pins on the rectification board, so that the data acquisition board and the rectification board are fixedly connected and electrically connected.

[0121] In the data acquisition board of this embodiment, straight pins JP1_1, JP2_1, JP3_1, JP4_1, and JP5_1 are provided. The straight pin JP1_1 is electrically connected to a second end of the test winding. The straight pin JP2_1 is electrically connected to the terminal A251. The straight pin JP3_1 is electrically connected to the power supply interface 27, i.e., connector P3 (for supplying the voltage rectified by the rectification board to the power supply interface 27). The straight pin JP4_1 is electrically connected to the terminal B252. The straight pin JP5_1 is electrically connected to the terminal C253.

[0122] Straight pin holes JP1, JP2, JP3, JP4, and JP5 are provided on the rectification board. The straight pin JP1_1 is inserted and mated with the straight pin hole JP1. The straight pin JP2_1 is inserted and mated with the straight pin hole JP2. The straight pin JP3_1 is inserted and mated with the straight pin hole JP3. The straight pin JP4_1 is inserted and mated with the straight pin hole JP4.

[0123] The first end of the first rectifying unit is electrically connected to the straight plug pinhole JP2 and one end of the first power resistor respectively. The first end of the second rectifying unit is electrically connected to the straight plug pinhole JP4. The first end of the third rectifying unit is electrically connected to the straight plug pinhole JP5. The second end of the first rectifying unit, the second end of the second rectifying unit and the second end of the third rectifying 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 straight plug pinhole JP1. The second end of the first rectifying unit is connected to one end of the second power resistor. The other end of the second power resistor is electrically connected to the straight plug pinhole JP3 and is connected to the power supply interface 27, i.e., the connector P3, through the straight plug pinhole JP3 and the straight plug pin JP3-1.

[0124] Certainly, the circuit on the rectifying board can also be arranged on the data acquisition board.

[0125] Further, the electronic module 1 includes an electronic housing, which includes a left housing, a middle housing and a right housing. The left housing, the middle housing and the right housing are detachably connected to form an installation cavity inside the electronic housing. A main board, a power supply board and a panel are fixed on the electronic housing. The main board, the power supply board and the panel can be installed in the installation cavity.

[0126] See Figure 8 and Figure 9 , a main control chip, a metering chip and an RS485 communication circuit are provided on the main board. One end of the RS485 communication circuit is electrically connected to the main control chip, and the other end of the RS485 communication circuit is connected to a communication interface. The input end of the metering chip is electrically connected to the voltage detection points (A-phase voltage detection point, B-phase voltage detection point and C-phase voltage detection point) on the data acquisition board and the phase current transformers 23 (A-phase phase current transformer 23, B-phase phase current transformer 23, C-phase phase current transformer 23). The output end of the metering chip is connected to the input end of the main control chip.

[0127] Further, a storage module and a clock module are provided on the main board, and the storage module and the clock module are electrically connected to the main control chip.

[0128] Further, a PE loop detection circuit, a PE disconnection detection circuit and a trip control circuit are arranged on the power supply board.

[0129] Further, the main control chip uses a processor.

[0130] Further, a wireless communication interface for connecting to a wireless communication chip (wireless communication board) is provided on the main board. The wireless communication interface is connected to the main control chip. A power supply board interface is provided on the main board.

[0131] Further, a wireless communication board (Internet of Things module) can also be fixed on the electronic housing. At this time, the circuit breaker of the present utility model has a wireless communication function.

[0132] A wireless communication chip is provided on the wireless communication board.

[0133] The Internet of Things module in this embodiment can but is not limited to using a 4G Internet of Things card.

[0134] When the circuit breaker is not provided with a wireless communication board, the circuit breaker is electrically connected to a device with a wireless communication function (such as a circuit breaker with a wireless communication function or a separate gateway device) through a communication interface.

[0135] Further, the electronic module 1 further includes an electric operation module for operating the opening and closing of the circuit breaker body 3.

[0136] A power circuit is provided on the power supply board, and the power circuit is used to supply power to the circuit breaker. The power circuit is as Figure 14 shown. The power 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 end of the first power supply unit is connected to the power interface and is used to convert the voltage output by the power interface (the voltage output by the rectification board) into a voltage HVDC. The second power supply unit is used to convert the voltage HVDC 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 (such as VDD3.3V).

[0137] A display circuit is provided on the panel, and the panel is electrically connected to the main board. The display circuit includes a display screen, and the display circuit is as Figure 15 shown.

[0138] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present utility model. However, the present utility model is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these modifications and improvements are also regarded as the protection scope of the present utility model.

Claims

1. A data acquisition circuit for an intelligent circuit breaker, characterized in that: It includes a leakage detection circuit, and the leakage detection circuit includes a first current transformer. The first end of the first current transformer is respectively connected to the input end of a first filter circuit and one end of a first clamping circuit. The second end of the first current transformer is grounded, and the other end of the first clamping circuit is grounded. The output end of the first filter circuit is connected to the input end of a first amplifier, and the output end of the first amplifier is the output end of the leakage detection circuit.

2. The data acquisition circuit of the intelligent circuit breaker according to claim 1, characterized in that: The leakage detection circuit further includes a resistor R41 and a capacitor C44. One end of the resistor R41 is connected to the first end of the first current transformer, and the other end of the resistor R41 is grounded. One end of the capacitor C44 is connected to the first end of the first current transformer, and the other end of the capacitor C44 is grounded.

3. The data acquisition circuit of the intelligent circuit breaker according to claim 1, characterized in that: The first clamping circuit includes a double series switch diode D2. The first pole of the double series switch diode D2 is connected to the first end of the first current transformer, and the second pole and the third pole of the double series switch diode D2 are grounded. and / or The first filter circuit includes a resistor R37, a resistor R38 and a capacitor C45. One end of the resistor R37 is connected to the first end of the first current transformer. The other end of the resistor R37 is respectively connected to one end of the capacitor C45 and one end of the resistor R38. The other end of the capacitor C45 is grounded, and the other end of the resistor R38 is connected to the negative input end of the first amplifier. and / or The first amplifier includes an operational amplifier U2. The positive input end of the operational amplifier U2 is grounded. The negative input end of the operational amplifier U2 is connected to the output end of the first filter circuit. The negative input end of the operational amplifier U2 is connected to one end of a resistor R34, and the other end of the resistor R34 is connected to the output end of the operational amplifier U2.

4. The data acquisition circuit of the intelligent circuit breaker according to claim 1, characterized in that: The leakage detection circuit further includes an inductor L2. One end of the inductor L2 is connected to the output end of the first amplifier, and the other end of the inductor L2 is the output end of the leakage detection circuit. and / or The leakage detection circuit further includes a resistor R42. One end of the resistor R42 is connected to the output end of the leakage detection circuit, and the other end of the resistor R42 is grounded. and / or The leakage detection circuit further includes a capacitor C46. One end of the capacitor C46 is connected to the output end of the leakage detection circuit, and the other end of the capacitor C46 is grounded. and / or The output end of the leakage detection circuit is used to be connected to the main control circuit.

5. The data acquisition circuit of the intelligent circuit breaker according to claim 1, characterized in that: The first current transformer is a zero-sequence current transformer, and the first current transformer surrounds the outside of the three-phase lines A, B, C and the neutral line N.

6. The data acquisition circuit of the intelligent circuit breaker according to claim 1, characterized in that: It further includes a current detection circuit. The current detection circuit includes a phase current transformer. The phase current transformer is connected to the input end of a current sampling circuit. The output end of the current sampling circuit is connected to the current measurement signal input end of a metering chip, and the output end of the metering chip is used to be connected to the main control circuit. and / or It further includes a voltage detection circuit. The voltage detection circuit includes a voltage sampling circuit. The input end of the voltage sampling circuit is used to receive the phase voltage. The output end of the voltage sampling circuit is connected to the voltage measurement signal input end of the metering chip, and the output end of the metering chip is used to be connected to the main control circuit.

7. The data acquisition circuit of the intelligent circuit breaker according to claim 1, characterized in that: It further includes a temperature detection circuit for detecting the internal temperature of the circuit breaker. The temperature detection circuit is used to be electrically connected to the main control circuit.

8. The data acquisition circuit of the intelligent circuit breaker according to claim 1, wherein: It further includes a PE disconnection detection circuit. The PE disconnection detection circuit includes an optocoupler UO1. The anode of the diode of the optocoupler UO1 is connected to a first voltage through a resistor, the cathode of the diode of the optocoupler UO1 is connected to PE_IN, the collector of the triode of the optocoupler UO1 is respectively connected to the first input end of the main control circuit, one end of a resistor R11, and one end of a 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 emitter of the triode of the optocoupler UO1 is grounded, and PE_IN is connected to the ground.

9. The data acquisition circuit of the intelligent circuit breaker according to claim 1, wherein: It further includes a PE loop detection circuit. The PE loop detection circuit includes a second current transformer and an operational amplifier OPA. The first input end of the second current transformer is connected to the PE line, the second input end of the second current transformer is connected to the N line, the first output end of the second current transformer is respectively connected to one end of a resistor R4, one end of a capacitor C2, the input end of a second filter circuit, and one end of a second clamping circuit. The other end of the resistor R4 and the other end of the capacitor C2 are grounded, the other end of the second clamping circuit is grounded, the output end of the second filter circuit is connected to the input end of a second amplifier, and the output end of the second amplifier is used to be connected to the input end CheckPE of the main control circuit.

10. An intelligent circuit breaker, characterized in that: It includes the data acquisition circuit according to any one of claims 1 to 9.

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