Hand-held detection device of circuit breaker

Abstract

The utility model provides handheld detection equipment for a circuit breaker. The handheld detection equipment comprises a detection controller, a first acquisition circuit, an analog-to-digital conversion circuit, a digital-to-analog conversion circuit and a first communication interface, the input end of the detection controller is electrically connected with the output end of the first acquisition circuit and the output end of the analog-to-digital conversion circuit, the output end of the detection controller is electrically connected with the input end of the digital-to-analog conversion circuit, the communication end of the detection controller is electrically connected with the first communication interface, and the input end of the first acquisition circuit is electrically connected with the power line. The equipment can realize on-site detection, and the circuit breaker does not need to be returned to a factory.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a handheld detection device for circuit breakers. Background Art

[0002] Intelligent circuit breakers have the function of collecting parameters such as voltage, current, and electric energy. In order to ensure the accuracy of the collection, the circuit breakers are calibrated before leaving the factory. However, the electronic components themselves will drift over time, which may cause deviations in the digital display of the collected data or functional failure of the circuit breaker.

[0003] During use, the circuit breaker needs to be tested to determine whether the electronic components in the circuit breaker drift and locate the specific circuit part where the drift occurs. The existing detection scheme usually removes the circuit breaker from the site and returns it to the factory for testing using corresponding instruments. This operation takes a long time, consumes a lot of manpower and material resources, is costly, and is complicated to operate, and has high requirements for testers. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a handheld detection device for a circuit breaker.

[0005] In one embodiment, the utility model provides a handheld detection device for a circuit breaker, which is used to detect the circuit breaker; the handheld detection device for the circuit breaker includes:

[0006] A detection controller, a first acquisition circuit, an analog-to-digital conversion circuit, a digital-to-analog conversion circuit and a first communication interface;

[0007] The input end of the detection controller is electrically connected to the output end of the first acquisition circuit and the output end of the analog-to-digital conversion circuit respectively, the output end of the detection controller is electrically connected to the input end of the digital-to-analog conversion circuit, the communication end of the detection controller is electrically connected to the first communication interface, the input end of the first acquisition circuit is used to be electrically connected to the power line, and the input end of the analog-to-digital conversion circuit, the output end of the digital-to-analog conversion circuit and the first communication interface are respectively used to be electrically connected to the circuit breaker.

[0008] In one embodiment, the analog-to-digital conversion circuit includes a first voltage stabilizing filter circuit and an analog-to-digital conversion chip;

[0009] The input end of the first voltage stabilizing filter circuit is used to connect the circuit breaker, the output end of the first voltage stabilizing filter circuit is electrically connected to the input end of the analog-to-digital conversion chip, and the output end of the analog-to-digital conversion chip is electrically connected to the input end of the detection controller.

[0010] In one embodiment, the first voltage stabilizing filter circuit includes a first bidirectional TVS tube, a first clamping diode, a second clamping diode, a first filter inductor and a first filter capacitor;

[0011] The first anode of the first bidirectional TVS tube is electrically connected to the first end of the first filter inductor, the second end of the first filter inductor is electrically connected to the anode of the first clamping diode, the cathode of the second clamping diode, the first end of the first filter capacitor and the input end of the analog-to-digital conversion chip respectively, the cathode of the first clamping diode is connected to the reference voltage, and the second anode of the first bidirectional TVS tube, the anode of the second clamping diode and the second end of the first filter capacitor are grounded.

[0012] In one embodiment, the digital-to-analog conversion circuit includes a second voltage stabilizing filter circuit and a digital-to-analog conversion chip;

[0013] The input end of the digital-to-analog conversion chip is electrically connected to the output end of the detection controller, the output end of the digital-to-analog conversion chip is electrically connected to the input end of the second voltage stabilizing filter circuit, and the output end of the second voltage stabilizing filter circuit is used to be electrically connected to the circuit breaker.

[0014] In one embodiment, the second voltage stabilizing filter circuit includes a third clamping diode, a fourth clamping diode, a second filter inductor, a second filter capacitor and a second bidirectional TVS tube;

[0015] The anode of the third clamping diode and the cathode of the fourth clamping diode are electrically connected to the output end of the digital-to-analog conversion chip and the first end of the second filter inductor respectively, the second end of the second filter inductor is electrically connected to the first end of the second filter capacitor and the first anode of the second bidirectional TVS tube respectively, the cathode of the third clamping diode is connected to the reference voltage, and the anode of the fourth clamping diode, the second end of the second filter capacitor and the second anode of the second bidirectional TVS tube are grounded.

[0016] In one embodiment, the handheld detection device for the circuit breaker further includes a digital input circuit and a digital output circuit;

[0017] The output end of the digital input circuit is electrically connected to the input end of the detection controller, the input end of the digital output circuit is electrically connected to the output end of the detection controller, and the input end of the digital input circuit and the output end of the digital output circuit are respectively used to be electrically connected to the circuit breaker.

[0018] In one embodiment, the digital input circuit includes a third bidirectional TVS tube, a third filter capacitor and a first photocoupler;

[0019] The first anode of the third bidirectional TVS tube is electrically connected to the first end of the third filter capacitor and the input end of the first photocoupler, the second anode of the third bidirectional TVS tube and the second end of the third filter capacitor are grounded, and the output end of the first photocoupler is electrically connected to the input end of the detection controller.

[0020] In one embodiment, the digital output circuit includes a second photocoupler, a triode and a fourth bidirectional TVS tube;

[0021] The input end of the second photocoupler is electrically connected to the output end of the detection controller, the output end of the second photocoupler is electrically connected to the base of the transistor, the collector of the transistor is electrically connected to the first anode of the fourth bidirectional TVS tube, and the emitter of the transistor and the second anode of the fourth bidirectional TVS tube are grounded.

[0022] In one embodiment, the handheld detection device for the circuit breaker further comprises a human-computer interaction device;

[0023] The human-machine interaction device is electrically connected to the detection controller.

[0024] In one embodiment, the human-computer interaction device includes a touch display screen.

[0025] In one embodiment, the circuit breaker includes a circuit breaker controller, an analog switch and a second acquisition circuit, wherein the input end of the circuit breaker controller is electrically connected to the output end of the second acquisition circuit through the analog switch; the analog switch is used to electrically connect the analog-to-digital conversion circuit, the digital-to-analog conversion circuit, the digital input circuit and the digital output circuit respectively.

[0026] In one embodiment, the circuit breaker further includes a second communication interface, a switch acquisition circuit and a drive circuit, the communication end of the circuit breaker controller is electrically connected to the second communication interface, and the switch acquisition circuit and the drive circuit are used to electrically connect the analog switch.

[0027] Through the handheld detection device of the circuit breaker, the first acquisition circuit can obtain the grid parameters on the power line under the control of the detection controller, and the analog-to-digital conversion circuit and the digital-to-analog conversion circuit can realize the reception and transmission of analog signals under the control of the detection controller, replacing the receiving and transmitting function of the circuit breaker itself. Since the components in the handheld detection device of the circuit breaker can be ensured to be accurate, the data deviation of the circuit breaker can be detected on this basis, and the detection can be realized on site without returning the circuit breaker to the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a schematic diagram of the structure of a handheld detection device for a circuit breaker and a circuit breaker in one embodiment of the utility model;

[0030] Figure 2 This is a structural schematic diagram of a first voltage stabilizing filter circuit in one embodiment of the utility model;

[0031] Figure 3 This is a schematic diagram of the structure of a second voltage stabilizing filter circuit in one embodiment of the utility model;

[0032] Figure 4 This is a structural diagram of a digital input circuit in one embodiment of the utility model;

[0033] Figure 5 It is a structural schematic diagram of a digital output circuit in one embodiment of the utility model. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0035] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order to enable any person skilled in the art to implement and use the utility model, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art can recognize that the utility model can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the utility model obscure. Therefore, the utility model is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in this application.

[0036] like Figure 1 As shown, in one embodiment, the utility model provides a handheld detection device for a circuit breaker, which is used to detect the circuit breaker. The circuit breaker includes a circuit breaker controller, an analog switch, a second acquisition circuit and a second communication interface. The communication end of the circuit breaker controller is electrically connected to the second communication interface, and the input end of the circuit breaker controller is electrically connected to the output end of the second acquisition circuit through the analog switch. Figure 1 In the embodiment, the second acquisition circuit includes a second current acquisition circuit and a second voltage acquisition circuit.

[0037] The analog switch realizes the channel selection function, and can control the connection between the corresponding input and the corresponding output in different switch states.

[0038] The input end of the second acquisition circuit is electrically connected to the power line for acquiring power grid parameters on the power line, and when the analog switch is in a corresponding switch state, the acquired power grid parameters are sent to the circuit breaker controller through the analog switch.

[0039] like Figure 1 As shown, the handheld detection device for the circuit breaker includes a detection controller, a first acquisition circuit, an analog-to-digital conversion circuit, a digital-to-analog conversion circuit and a first communication interface. Figure 1 In the embodiment, the first acquisition circuit includes a first current acquisition circuit and a first voltage acquisition circuit. The first current acquisition circuit may include a current clamp, and the first voltage acquisition circuit may include a voltage transmitter.

[0040] The input end of the detection controller is electrically connected to the output end of the first acquisition circuit and the output end of the analog-to-digital conversion circuit respectively, the output end of the detection controller is electrically connected to the input end of the digital-to-analog conversion circuit, the communication end of the detection controller is electrically connected to the first communication interface, and the input end of the first acquisition circuit is electrically connected to the power line.

[0041] The function of the first acquisition circuit is the same as that of the second acquisition circuit in the above-mentioned circuit breaker, both of which are to acquire grid parameters on the power line. The specific circuit structures of the second acquisition circuit and the first acquisition circuit may be different.

[0042] Among them, the handheld detection device of the circuit breaker is used to detect the circuit breaker, and it needs to be connected with the circuit breaker to complete the detection work, that is, when the handheld detection device of the circuit breaker is electrically connected to the circuit breaker, the input end of the analog-to-digital conversion circuit is electrically connected to the output end of the second acquisition circuit through the analog switch, the output end of the digital-to-analog conversion circuit is electrically connected to the input end of the circuit breaker controller through the analog switch, and the first communication interface is electrically connected to the second communication interface. When the handheld detection device of the circuit breaker does not perform the detection work, it has no connection relationship with the circuit breaker, and the circuit breaker operates independently.

[0043] Among them, when the circuit breaker is operating normally, it obtains the grid parameters on the power line through the second acquisition circuit, and then sends the grid parameters to the ADC (analog-to-digital conversion) on the circuit breaker controller for reception, so that the circuit breaker controller obtains the grid parameters after analog-to-digital conversion, and then obtains the actual grid parameters on the power line based on the converted grid parameters and the corresponding calibration parameters. The calibration parameters can be understood as the difference between the actual grid parameters on the power line and the converted grid parameters, including the multiple relationship and the offset. After the circuit breaker controller obtains the actual grid parameters, it can perform operations such as tripping control and power metering.

[0044] However, during the long-term use of the circuit breaker, the ADC on the second acquisition circuit and the circuit breaker controller may drift, resulting in deviations when processing the grid parameters. Therefore, the circuit breaker needs to be tested to ensure its accuracy.

[0045] When the circuit breaker needs to be inspected, the handheld inspection device of the circuit breaker is electrically connected to the circuit breaker, and the inspection controller communicates and interacts with the circuit breaker controller through the second communication interface and the first communication interface to transmit relevant inspection instructions, thereby calling each module to achieve the inspection purpose.

[0046] The first acquisition circuit acquires grid parameters on the power line and feeds them back to the detection controller so that the detection controller obtains accurate and actual grid parameters. The detection controller obtains the actual grid parameters calculated in the circuit breaker controller through the second communication interface and the first communication interface, and compares whether there are differences between the two actual grid parameters. If so, it can be determined that at least one of the ADCs on the second acquisition circuit and the circuit breaker controller has drift.

[0047] By comparing the two actual power grid parameters, it is possible to determine whether the circuit breaker as a whole has drift, but it is difficult to determine the specific part where the drift occurs. In view of this situation, the analog-to-digital conversion circuit and the circuit breaker controller respectively obtain the power grid parameters output by the second acquisition circuit through the analog switch, the analog-to-digital conversion circuit performs analog-to-digital conversion on the obtained power grid parameters and then feeds them back to the detection controller, and the circuit breaker controller sends the converted power grid parameters to the detection controller through the first communication interface and the second communication interface, so that the detection controller compares whether there is a difference between the two converted power grid parameters, and if so, it can be determined that the ADC on the circuit breaker controller has drift. In addition, the detection controller can also control the digital-to-analog conversion circuit to output the corresponding waveform to simulate the power grid parameters output by the second acquisition circuit, and the ADC on the circuit breaker controller obtains the power grid parameters output by the digital-to-analog conversion circuit through the analog switch and performs analog-to-digital conversion, so that the circuit breaker controller obtains the converted power grid parameters, and the circuit breaker controller sends the converted power grid parameters to the detection controller through the first communication interface and the second communication interface, so that the detection controller compares the power grid parameters output to the digital-to-analog conversion circuit and the power grid parameters sent by the circuit breaker controller, and if there is a difference, it is determined that the ADC on the circuit breaker controller has drift.

[0048] Ideally, if the drift of the circuit breaker is determined by the second acquisition circuit and the ADC on the circuit breaker controller, then the difference between the two actual grid parameters and the difference between the two converted grid parameters can also determine whether the second acquisition circuit has drift. In addition, if the multiple relationship between the input and output of the second acquisition circuit determined at the factory can be obtained, the grid parameters output by the second acquisition circuit can also be obtained through the analog-to-digital conversion circuit, so that the detection controller obtains the actual grid parameters corresponding to the second acquisition circuit based on the grid parameters output by the second acquisition circuit and the multiple relationship between the second acquisition circuit, and the detection controller then compares the actual grid parameters obtained by the first acquisition circuit with the actual grid parameters obtained above, and if there is a difference, it is determined that the second acquisition circuit has drift.

[0049] After determining that there is drift in the circuit breaker as a whole, the detection controller can determine new calibration parameters based on the acquired accurate and actual grid parameters and the converted grid parameters sent by the circuit breaker controller, and then send the new calibration parameters to the circuit breaker controller to achieve calibration after drift detection.

[0050] Wherein, both the detection controller and the circuit breaker controller may adopt MCU, and the second communication interface and the first communication interface may adopt CAN bus interface.

[0051] Through the handheld detection device of the circuit breaker, the first acquisition circuit can obtain the grid parameters on the power line under the control of the detection controller, and the analog-to-digital conversion circuit and the digital-to-analog conversion circuit can realize the reception and transmission of analog signals under the control of the detection controller. Under the channel control of the analog switch in the circuit breaker, the receiving and transmitting functions of the circuit breaker controller and the second acquisition circuit in the circuit breaker are replaced. Since the components in the handheld detection device of the circuit breaker can be ensured to be accurate, the data deviation of the circuit breaker can be detected on this basis.

[0052] In one embodiment, the analog-to-digital conversion circuit includes a first voltage stabilizing filter circuit and an analog-to-digital conversion chip;

[0053] When the handheld detection device of the circuit breaker is electrically connected to the circuit breaker, the input end of the first voltage stabilizing filter circuit is electrically connected to the output end of the second acquisition circuit through the analog switch, the output end of the first voltage stabilizing filter circuit is electrically connected to the input end of the analog-to-digital conversion chip, and the output end of the analog-to-digital conversion chip is electrically connected to the input end of the detection controller.

[0054] Among them, Figure 2 As shown, the first voltage stabilizing filter circuit includes a first bidirectional TVS tube D9, a first clamping diode D17, a second clamping diode D18, a first filter inductor L8 and a first filter capacitor C89.

[0055] When the handheld detection device of the circuit breaker is electrically connected to the circuit breaker, the first anode of the first bidirectional TVS tube D9 is respectively connected to the analog switch (such as Figure 2 The Analog Vin V1 UA terminal in the circuit is electrically connected to the first end of the first filter inductor L8, and the second end of the first filter inductor L8 is electrically connected to the anode of the first clamping diode D17, the cathode of the second clamping diode D18, the first end of the first filter capacitor C89 and the input end of the analog-to-digital conversion chip respectively to output a V1 IN signal. The cathode of the first clamping diode D17 is connected to a reference voltage of +3.3V, and the second anode of the first bidirectional TVS tube D9, the anode of the second clamping diode D18 and the second end of the first filter capacitor C89 are grounded.

[0056] Among them, the first filter inductor L8 and the first filter capacitor C89 are used to achieve signal filtering. The first bidirectional TVS tube D9 is used for surge protection to avoid impact. The first clamping diode D17 and the second clamping diode D18 are used for clamping. If the voltage drop of the diode itself is not considered, the output voltage can be limited to between 0-3.3V under the joint action of the two to meet the output requirements.

[0057] Among them, Figure 2As shown, the first voltage stabilizing filter circuit also includes a capacitor C81 and a current limiting resistor R63, the first end of the capacitor C81 is electrically connected to the second end of the first filter inductor L8, the second end of the capacitor C81 is electrically connected to the first end of the current limiting resistor R63, the third end of the capacitor C81 is grounded, and the second end of the current limiting resistor R63 is electrically connected to the anode of the first clamping diode D17 and the cathode of the second clamping diode D18 respectively.

[0058] In one embodiment, the digital-to-analog conversion circuit includes a second voltage stabilizing filter circuit and a digital-to-analog conversion chip;

[0059] The input end of the digital-to-analog conversion chip is electrically connected to the output end of the detection controller, and the output end of the digital-to-analog conversion chip is electrically connected to the input end of the second voltage stabilizing filter circuit. When the handheld detection device of the circuit breaker is electrically connected to the circuit breaker, the output end of the second voltage stabilizing filter circuit is electrically connected to the input end of the circuit breaker controller through the analog switch.

[0060] Among them, Figure 3 As shown, the second voltage stabilizing and filtering circuit includes a third clamping diode D26, a fourth clamping diode D21, a second filtering inductor L16, a second filtering capacitor C111 and a second bidirectional TVS tube D31.

[0061] The anode of the third clamping diode D26 and the cathode of the fourth clamping diode D21 are respectively electrically connected to the output end of the digital-to-analog conversion chip and the first end of the second filter inductor L16 to access the TPC116S8Vout1 signal. When the handheld detection device of the circuit breaker is electrically connected to the circuit breaker, the second end of the second filter inductor L16 is respectively connected to the first end of the second filter capacitor C111, the first anode of the second bidirectional TVS tube D31 and the analog switch (such as Figure 3 The cathode of the third clamping diode D26 is connected to the reference voltage of +3.3V, and the anode of the fourth clamping diode D21, the second end of the second filter capacitor C111 and the second anode of the second bidirectional TVS tube D31 are grounded.

[0062] Among them, the second filter inductor L16 and the second filter capacitor C111 are used to achieve signal filtering. The second bidirectional TVS tube D31 is used for surge protection to avoid impact. The third clamping diode D26 and the fourth clamping diode D21 are used for clamping. If the voltage drop of the diode itself is not considered, the output voltage can be limited to between 0-3.3V under the joint action of the two to meet the output requirements.

[0063] like Figure 1 As shown, in one embodiment, the circuit breaker further includes a switch acquisition circuit and a drive circuit; the handheld detection device of the circuit breaker further includes a digital input circuit and a digital output circuit.

[0064] Among them, the switch acquisition circuit is used to collect the switch signal of the micro switch in the circuit breaker. The state of the micro switch is consistent with that of the release in the circuit breaker. When the release is in the tripping state, the micro switch is in the first state, and when the release is not in the tripping state, the micro switch is in the second state. In other words, the switch signal collected by the switch acquisition circuit can indicate whether the release is in the tripping state. The drive circuit is used to drive the release to trip.

[0065] Among them, the output end of the digital input circuit is electrically connected to the input end of the detection controller, and the input end of the digital output circuit is electrically connected to the output end of the detection controller. When the handheld detection device of the circuit breaker is electrically connected to the circuit breaker, the input end of the digital input circuit is electrically connected to the output end of the switch acquisition circuit through an analog switch, and the output end of the digital output circuit is electrically connected to the input end of the drive circuit through the analog switch.

[0066] Among them, under the control of the detection controller, the digital output circuit can output the corresponding drive signal to the drive circuit through the analog switch, so that the drive circuit drives the release to trip. If the digital input circuit can receive the switch signal representing the trip output by the switch acquisition circuit through the analog switch, it means that the tripping part of the circuit breaker is normal, otherwise it means that the tripping part of the circuit breaker is abnormal. In addition, the detection controller can also obtain the switch signal obtained by the circuit breaker controller through the second communication interface and the first communication interface. If the two switch signals are consistent, it means that the circuit breaker controller monitors the tripping state normally, otherwise it means that the circuit breaker controller monitors the tripping state abnormally.

[0067] like Figure 4 As shown, in one embodiment, the digital input circuit includes a third bidirectional TVS tube D45, a third filter capacitor C135 and a first photocoupler U19.

[0068] When the handheld detection device of the circuit breaker is electrically connected to the circuit breaker, the first anode of the third bidirectional TVS tube D45 is respectively connected to the analog switch (such as Figure 4 The first end of the third filter capacitor C135 is electrically connected to the input end of the first photocoupler U19, the second anode of the third bidirectional TVS tube D45 and the second end of the third filter capacitor C135 are grounded, and the output end of the first photocoupler U19 is connected to the input end of the detection controller (such as Figure 4 1 terminal) in the GPDI.

[0069] Among them, the third bidirectional TVS tube D45 is used for surge protection, the third filter capacitor C135 is used for signal filtering, and the first photocoupler U19 is used for electrical isolation.

[0070] Among them, Figure 4As shown, the digital input circuit also includes a sampling resistor R94 and a current limiting resistor R103.

[0071] like Figure 5 As shown, in one embodiment, the digital output circuit includes a second photocoupler U24, a transistor Q6 and a fourth bidirectional TVS tube D51.

[0072] The input end of the second photoelectric coupler U24 is connected to the output end of the detection controller (such as Figure 5 The output end of the second photocoupler U24 is electrically connected to the base of the transistor Q6. When the handheld detection device of the circuit breaker is electrically connected to the circuit breaker, the collector of the transistor Q6 is respectively connected to the first anode of the fourth bidirectional TVSD51 tube and the analog switch (such as Figure 5 The ISO GPDO 1 terminal in the circuit is electrically connected, and the emitter of the transistor Q6 and the second anode of the fourth bidirectional TVS tube D51 are grounded.

[0073] Among them, the second photocoupler U24 is used for electrical isolation, and the fourth bidirectional TVS tube D51 is used for surge protection. It should be noted that the drive circuit is electrically connected to the collector of the transistor Q6 through the analog switch. When the detection controller outputs a high level, the second photocoupler U24 is turned on, the transistor Q6 is turned on, and the ISO GPDO 1 terminal does not directly output a high level, which depends on the internal structure of the drive circuit.

[0074] Among them, Figure 5 As shown, the digital output circuit further includes a current limiting resistor R99, a voltage dividing resistor R101 and a voltage dividing resistor R105, and a first end of the current limiting resistor R99 is connected to an output end of the detection controller (such as Figure 5 The first end of the current limiting resistor R99 is electrically connected to the input end of the second photocoupler U24, the first end of the voltage dividing resistor R101 is electrically connected to the output end of the second photocoupler U24, the second end of the voltage dividing resistor R101 is electrically connected to the first end of the voltage dividing resistor R105 and the base of the transistor Q6 respectively, and the second end of the voltage dividing resistor R105 is grounded.

[0075] It should be noted that power lines are usually three-phase four-wire or three-phase three-wire. Figures 2 to 5 The first voltage stabilizing filter circuit, the second voltage stabilizing filter circuit, the digital input circuit and the digital output circuit shown in the figure are only one of the circuits, and actually include multiple circuits with the same circuit structure.

[0076] In one embodiment, the handheld detection device for circuit breaker further includes a human-machine interaction device, and the human-machine interaction device is electrically connected to the detection controller.

[0077] The user can interact with the detection controller through the human-computer interaction device to view relevant data or input relevant instructions, so that the detection controller can detect or calibrate the circuit breaker according to user requirements.

[0078] Among them, Figure 1 As shown, the human-computer interaction device includes a touch display screen.

[0079] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0080] The handheld detection device for a circuit breaker provided by the utility model is introduced in detail above. The principle and implementation mode of the utility model are explained in this article by using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

[0081] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A handheld detection device for a circuit breaker, characterized in that: The handheld detection device of the circuit breaker is used to detect the circuit breaker; the handheld detection device of the circuit breaker includes: A detection controller, a first acquisition circuit, an analog-to-digital conversion circuit, a digital-to-analog conversion circuit and a first communication interface; The input end of the detection controller is electrically connected to the output end of the first acquisition circuit and the output end of the analog-to-digital conversion circuit respectively, the output end of the detection controller is electrically connected to the input end of the digital-to-analog conversion circuit, the communication end of the detection controller is electrically connected to the first communication interface, the input end of the first acquisition circuit is used to be electrically connected to the power line, the input end of the analog-to-digital conversion circuit, the output end of the digital-to-analog conversion circuit and the first communication interface are respectively used to be electrically connected to the circuit breaker.

2. The handheld detection device for circuit breaker according to claim 1, characterized in that: The analog-to-digital conversion circuit includes a first voltage stabilizing filter circuit and an analog-to-digital conversion chip; The input end of the first voltage stabilizing filter circuit is used to connect the circuit breaker, the output end of the first voltage stabilizing filter circuit is electrically connected to the input end of the analog-to-digital conversion chip, and the output end of the analog-to-digital conversion chip is electrically connected to the input end of the detection controller.

3. The handheld detection device for circuit breaker according to claim 2, characterized in that: The first voltage stabilizing filter circuit includes a first bidirectional TVS tube, a first clamping diode, a second clamping diode, a first filter inductor and a first filter capacitor; The first anode of the first bidirectional TVS tube is electrically connected to the first end of the first filter inductor, the second end of the first filter inductor is electrically connected to the anode of the first clamping diode, the cathode of the second clamping diode, the first end of the first filter capacitor and the input end of the analog-to-digital conversion chip respectively, the cathode of the first clamping diode is connected to the reference voltage, and the second anode of the first bidirectional TVS tube, the anode of the second clamping diode and the second end of the first filter capacitor are grounded.

4. The handheld detection device for circuit breaker according to claim 1, characterized in that: The digital-to-analog conversion circuit includes a second voltage stabilizing filter circuit and a digital-to-analog conversion chip; The input end of the digital-to-analog conversion chip is electrically connected to the output end of the detection controller, the output end of the digital-to-analog conversion chip is electrically connected to the input end of the second voltage stabilizing filter circuit, and the output end of the second voltage stabilizing filter circuit is used to be electrically connected to the circuit breaker.

5. The handheld detection device for circuit breaker according to claim 4, characterized in that: The second voltage stabilizing filter circuit includes a third clamping diode, a fourth clamping diode, a second filter inductor, a second filter capacitor and a second bidirectional TVS tube; The anode of the third clamping diode and the cathode of the fourth clamping diode are electrically connected to the output end of the digital-to-analog conversion chip and the first end of the second filter inductor, respectively; the second end of the second filter inductor is electrically connected to the first end of the second filter capacitor and the first anode of the second bidirectional TVS tube, respectively; the cathode of the third clamping diode is connected to the reference voltage; the anode of the fourth clamping diode, the second end of the second filter capacitor and the second anode of the second bidirectional TVS tube are grounded.

6. The handheld detection device for circuit breaker according to claim 1, characterized in that: The handheld detection device for the circuit breaker also includes a digital input circuit and a digital output circuit; The output end of the digital input circuit is electrically connected to the input end of the detection controller, the input end of the digital output circuit is electrically connected to the output end of the detection controller, and the input end of the digital input circuit and the output end of the digital output circuit are respectively used to be electrically connected to the circuit breaker.

7. The handheld detection device for circuit breaker according to claim 6, characterized in that: The digital input circuit includes a third bidirectional TVS tube, a third filter capacitor and a first photocoupler; The first anode of the third bidirectional TVS tube is electrically connected to the first end of the third filter capacitor and the input end of the first photocoupler, the second anode of the third bidirectional TVS tube and the second end of the third filter capacitor are grounded, and the output end of the first photocoupler is electrically connected to the input end of the detection controller.

8. The handheld detection device for circuit breaker according to claim 6, characterized in that: The digital output circuit includes a second photocoupler, a triode and a fourth bidirectional TVS tube; The input end of the second photocoupler is electrically connected to the output end of the detection controller, the output end of the second photocoupler is electrically connected to the base of the transistor, the collector of the transistor is electrically connected to the first anode of the fourth bidirectional TVS tube, and the emitter of the transistor and the second anode of the fourth bidirectional TVS tube are grounded.

9. The handheld detection device for circuit breaker according to claim 1, characterized in that: The handheld detection device for the circuit breaker also includes a human-computer interaction device; The human-computer interaction device is electrically connected to the detection controller.

10. The handheld detection device for circuit breaker according to claim 9, characterized in that: The human-computer interaction device comprises a touch display screen.

11. The handheld detection device for circuit breaker according to claim 6, characterized in that: The circuit breaker includes a circuit breaker controller, an analog switch and a second acquisition circuit. The input end of the circuit breaker controller is electrically connected to the output end of the second acquisition circuit through the analog switch; the analog switch is used to electrically connect the analog-to-digital conversion circuit, the digital-to-analog conversion circuit, the digital input circuit and the digital output circuit respectively.

12. The handheld detection device for circuit breaker according to claim 11, characterized in that: The circuit breaker further includes a second communication interface, a switch acquisition circuit and a drive circuit. The communication end of the circuit breaker controller is electrically connected to the second communication interface. The switch acquisition circuit and the drive circuit are used to electrically connect the analog switch.

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