Circuit breaker device

Abstract

The embodiment of the utility model provides a circuit breaker device. The device comprises a sampling circuit, a signal modulation circuit and a metering signal processing circuit, the input end of the sampling circuit is used for accessing input current, and the output end of the sampling circuit is respectively connected with the input end of the signal modulation circuit and the input end of the metering signal processing circuit; the signal modulation circuit is used for collecting current signals of the sampling circuit through the output end of the sampling circuit, superposing the collected current signals and outputting protection signals; the metering signal processing circuit collects current signals of the sampling circuit through the output end of the sampling circuit and outputs metering data based on the collected current signals. The influence of a multi-stage operational amplifier circuit and the influence of an additional reference signal due to the fact that the signals in the circuit breaker can be input into the metering signal processing circuit only by the multi-stage operational amplifier circuit in the prior art are avoided, the circuit is more simplified, and the metering precision is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, and more specifically, to a circuit breaker device. Background Art

[0002] A circuit breaker can be used to connect and disconnect a load circuit, and can also be used to control a motor that is not frequently started. Its function is equivalent to the combined functions of some or all of the electrical appliances such as a knife switch, an overcurrent relay, a voltage loss relay, a thermal relay, and a leakage protector. It is an important protective electrical appliance in a low-voltage power distribution network. In a circuit breaker, current transformers are used to collect the magnitudes of the currents of each phase and compare them with a set value. When the current is abnormal, the microprocessor sends a signal to make the electronic release drive the operating mechanism to act.

[0003] In the prior art, a single-coil current transformer is used to achieve the metering protection of the circuit breaker circuit. However, the existing single-coil current transformer scheme is complex. It is necessary to use multiple-stage operational amplifiers to obtain the metering accuracy, and it is necessary to introduce a reference signal to raise the signal. Therefore, the obtained metering accuracy is not high, which affects the subsequent sampling accuracy. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a circuit breaker device, aiming at the deficiencies in the above-mentioned prior art, to improve the metering accuracy of the circuit breaker and the scheme is simple.

[0005] To achieve the above purpose, the technical solutions adopted in the embodiments of the utility model are as follows:

[0006] The utility model provides a circuit breaker device, which includes: a sampling circuit, a signal modulation circuit, and a metering signal processing circuit;

[0007] The input end of the sampling circuit is used to connect an input current, and the output end of the sampling circuit is respectively connected to the input end of the signal modulation circuit and the input end of the metering signal processing circuit;

[0008] The signal modulation circuit is used to collect the current signal of the sampling circuit through the output end of the sampling circuit, superimpose the collected current signal, and output a protection signal;

[0009] The metering signal processing circuit collects the current signal of the sampling circuit through the output end of the sampling circuit, and outputs metering data based on the collected current signal.

[0010] Optionally, the sampling circuit includes: a first sampling unit and a second sampling unit;

[0011] The first end of the first sampling unit is used to access a first input current. The second end of the first sampling unit is connected to the second end of the second sampling unit. The third end of the first sampling unit is used to be grounded. The fourth end of the first sampling unit is respectively connected to the input end of the signal modulation circuit and the input end of the metering signal processing circuit;

[0012] The first end of the second sampling unit is used to access a second input current. The third end of the second sampling unit is used to be grounded. The fourth end of the second sampling unit is respectively connected to the input end of the signal modulation circuit and the input end of the metering signal processing circuit.

[0013] Optionally, the first sampling unit includes: a first sampling resistor, a first diode, and a second diode; the second sampling unit includes a second sampling resistor, a third diode, and a fourth diode;

[0014] One end of the first sampling resistor and one end of the second sampling resistor are respectively used to connect to ground. The other end of the first sampling resistor is used to be respectively connected to the positive electrode end of the first diode, the input end of the signal modulation circuit, and the input end of the metering signal processing circuit;

[0015] The negative electrode end of the first diode is used to connect to the positive electrode end of the second diode and the first input current. The negative electrode end of the second diode is used to connect to the negative electrode end of the fourth diode;

[0016] The other end of the second sampling resistor is respectively connected to the positive electrode end of the third diode, the input end of the signal modulation circuit, and the input end of the metering signal processing circuit;

[0017] The negative electrode end of the third diode is respectively used to connect to the positive electrode end of the fourth diode and the second input current.

[0018] Optionally, the signal modulation circuit includes a first input resistor, a second input resistor, a first feedback resistor, and an operational amplifier unit;

[0019] One end of the first input resistor is connected to the other end of the first sampling resistor. The other end of the first input resistor is respectively connected to one end of the first feedback resistor and the negative input end of the operational amplifier unit;

[0020] One end of the second input resistor is connected to the other end of the second sampling resistor. The other end of the second input resistor is respectively connected to one end of the first feedback resistor and the negative input end of the operational amplifier unit;

[0021] The other end of the first feedback resistor is connected to the output terminal of the operational amplifier unit. The positive input terminal of the operational amplifier unit is grounded, and the output terminal of the operational amplifier unit is used to output a superimposed protection signal.

[0022] Optionally, the sampling circuit includes: a third sampling resistor and a fourth sampling resistor;

[0023] One end of the third sampling resistor is used to access the first input current, the input terminal of the signal modulation circuit, and the input terminal of the metering signal processing circuit, and the other end of the third sampling resistor is grounded;

[0024] One end of the fourth sampling resistor is connected to the second input current, the input terminal of the signal modulation circuit, and the input terminal of the metering signal processing circuit, and the other end of the fourth sampling resistor is grounded.

[0025] Optionally, the signal modulation circuit includes: a first inverting proportional operational amplifier unit and a second inverting proportional operational amplifier unit;

[0026] The input terminal of the first inverting proportional operational amplifier unit is connected to one end of the third sampling resistor. The output terminal of the first inverting proportional operational amplifier unit is connected to the other end of the second inverting proportional operational amplifier unit. The output terminal of the first inverting proportional operational amplifier unit is used to output a modulation signal;

[0027] The input terminal of the second inverting proportional operational amplifier unit is connected to one end of the fourth sampling resistor.

[0028] Optionally, the first inverting proportional operational amplifier unit includes: a third input resistor, a second feedback resistor, and a first operational amplifier module;

[0029] One end of the third input resistor is connected to one end of the third sampling resistor, and the other end of the third input resistor is respectively connected to the negative input terminal of the first operational amplifier module and one end of the second feedback resistor;

[0030] The other end of the second feedback resistor is respectively connected to the output terminal of the first operational amplifier module and the output terminal of the second operational amplifier module. The positive input terminal of the first operational amplifier module is grounded.

[0031] Optionally, the second inverting proportional operational amplifier unit includes: a fourth input resistor, a third feedback resistor, and a second operational amplifier module;

[0032] One end of the fourth input resistor is connected to one end of the fourth sampling resistor, and the other end of the fourth input resistor is respectively connected to the negative input terminal of the second operational amplifier module and one end of the third feedback resistor;

[0033] The other end of the third feedback resistor is respectively connected to the output terminal of the first operational amplifier module and the output terminal of the second operational amplifier module, and the positive input terminal of the second operational amplifier module is grounded.

[0034] Optionally, the metering signal processing circuit includes: a first filtering unit, a second filtering unit, and a metering chip;

[0035] The input terminal of the first filtering unit is connected to the output terminal of the sampling circuit, and the output terminal of the first filtering unit is connected to the metering chip;

[0036] The input terminal of the second filtering unit is connected to the output terminal of the sampling circuit, and the output terminal of the second filtering unit is connected to the metering chip.

[0037] Optionally, the first filtering unit includes: a first filtering resistor and a first filtering capacitor; the second filtering unit includes: a second filtering resistor and a second filtering capacitor;

[0038] One end of the first filtering resistor is connected to the output terminal of the sampling circuit, the other end of the first filtering resistor is respectively connected to one end of the first filtering capacitor and the metering chip, and the other end of the first filtering capacitor is grounded;

[0039] One end of the second filtering resistor is connected to the output terminal of the sampling circuit, the other end of the second filtering resistor is respectively connected to one end of the second filtering capacitor and the metering chip, and the other end of the second filtering capacitor is grounded.

[0040] The beneficial effects of the present utility model are as follows: By respectively connecting the output terminal of the sampling circuit to the input terminal of the signal modulation circuit and the input terminal of the metering signal processing circuit, the signal modulation circuit can directly collect the current signal at the output terminal of the sampling circuit, and superimpose and output a protection signal for the collected current signal. The circuit breaker can be protected by the protection signal output by the signal modulation circuit. At the same time, the metering signal processing circuit can directly collect the current signal at the output terminal of the sampling circuit, and perform calculation and processing on the collected current signal, so as to output the metering data of the circuit breaker, avoiding the influence of multiple-stage operational amplifier circuits and the influence of additional reference signals in the prior art, making the circuit simpler and the metering accuracy higher. Description of the Drawings

[0041] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the embodiments. It should be understood that the following attached drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related attached drawings can also be obtained based on these attached drawings.

[0042] Figure 1 is the circuit schematic diagram of the prior art 1;

[0043] Figure 2 is the circuit schematic diagram of the prior art 2;

[0044] Figure 3 is the structural schematic diagram of a circuit breaker device provided by an embodiment of the present utility model;

[0045] Figure 4 is the structural schematic diagram of a sampling circuit provided by an embodiment of the present utility model;

[0046] Figure 5 is the structural schematic diagram of a signal modulation circuit provided by the present utility model;

[0047] Figure 6 is the schematic diagram of signal processing by a circuit breaker device provided by the present utility model;

[0048] Figure 7 is the structure of a metering signal processing circuit provided by an embodiment of the present utility model;

[0049] Figure 8 is the structural schematic diagram of another sampling circuit provided by an embodiment of the present utility model;

[0050] Figure 9 is the structural schematic diagram of another signal modulation circuit provided by an embodiment of the present utility model;

[0051] Figure 10 is the schematic diagram of signal processing by another circuit breaker device provided by the present utility model;

[0052] Figure 11 is the connection schematic diagram of another metering signal processing circuit provided by an embodiment of the present utility model. Specific embodiments

[0053] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It should be understood that the accompanying drawings in the present utility model only serve the purpose of illustration and description, and are not used to limit the protection scope of the present utility model. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present utility model illustrate the operations implemented according to some embodiments of the present utility model. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without logical context may be reversed or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present utility model.

[0054] In addition, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present utility model.

[0055] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0056] In the description of the present utility model, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, it is 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 to the present utility model.

[0057] In addition, if terms such as "first", "second", etc. are only used for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0058] It should be noted that, without conflict, the features in the embodiments of the present utility model can be combined with each other.

[0059] In the prior art 1, the metering protection of the circuit breaker is realized through a dual-coil current transformer. Specifically, as Figure 1 shown, forFigure 1 In the prior art 1, since two current transformers are required and corresponding circuits need to be designed for connection, the circuit solution is complex, and there are many circuit interfaces, which is prone to the risk of incorrect insertion. In addition, due to the large number and volume of current transformers, it is not conducive to the use of miniaturized products.

[0060] In the prior art 2, the metering protection of the circuit breaker is realized through a single-coil current transformer. Specifically, as Figure 2 shown, but in the prior art 2, multiple-stage operational amplifiers are required to obtain the metering accuracy. At the same time, in order to raise the signal, an additional reference voltage needs to be introduced. Therefore, due to the influence of the offset parameters of each stage of the operational amplifier in the multiple-stage operational amplifier and the reason of introducing a reference signal to raise the signal, the finally obtained metering accuracy is poor.

[0061] Please refer to Figure 3 , which is a schematic structural diagram of a circuit breaker device provided by an embodiment of the present invention. As Figure 3 shown, the circuit breaker device may include: a sampling circuit 10, a signal modulation circuit 11, and a metering signal processing circuit 12.

[0062] Optionally, as Figure 3 shown, the input end of the sampling circuit 10 may be used to access the input current, and the output end of the sampling circuit 10 may be respectively connected to the input end of the signal modulation circuit 11 and the input end of the metering signal processing circuit 12. Specifically, the input end of the sampling circuit 10 may be connected to the secondary side output of a high-precision metering iron-core current transformer. That is to say, the secondary side of the high-precision metering iron-core current transformer outputs current, and the output current is input to the input end of the sampling circuit 10.

[0063] Optionally, the signal modulation circuit 11 may be used to collect the current signal of the sampling circuit 10 via the output end of the sampling circuit 10, and superimpose the collected current signal and output a protection signal. Among them, the protection signal output by the signal modulation circuit 11 is a protection signal, and this protection signal may be input to an analog-to-digital converter, and the protection signal is subjected to analog-to-digital conversion through the analog-to-digital converter, so as to realize the protection of the circuit breaker.

[0064] Optionally, the metering signal processing circuit 12 may collect the current signal of the sampling circuit 10 via the output end of the sampling circuit, and output metering data based on the collected current signal. Specifically, the metering signal processing circuit 12 may perform calculation processing on the collected current signal to obtain the current value on the circuit breaker loop.

[0065] In this embodiment, by connecting the output terminal of the sampling circuit to the input terminal of the signal modulation circuit and the input terminal of the metering signal processing circuit respectively, the signal modulation circuit can directly collect the current signal at the output terminal of the sampling circuit, and superimpose the collected current signal to output a protection signal. The circuit breaker can be protected by the protection signal output by the signal modulation circuit. At the same time, the metering signal processing circuit can directly collect the current signal at the output terminal of the sampling circuit, and perform calculation and processing on the collected current signal, so as to output the metering data of the circuit breaker, avoiding the need for a multi-stage operational amplifier circuit in the prior art to input the signal in the circuit breaker into the metering signal processing circuit, the influence of the multi-stage operational amplifier circuit and the influence of an additional reference signal, making the circuit simpler and the metering accuracy higher.

[0066] Please refer to Figure 4 , which is a schematic structural diagram of a sampling circuit provided by an embodiment of the present invention. As Figure 4 shown, the sampling circuit 10 may include: a first sampling unit 101 and a second sampling unit 102.

[0067] As Figure 4 shown, the first end of the first sampling unit 101 can be used to access a first input current, where the first input current can be a current output from the secondary side of a high-precision metering iron core transformer. The second end of the first sampling unit 101 can be connected to the second end of the second sampling unit 102. The third end of the first sampling unit 101 can be grounded. The fourth end of the first sampling unit 101 can be respectively connected to the input terminal of the signal modulation circuit 11 and the input terminal of the metering signal processing circuit 12. The fourth end of the first sampling unit 101 is the output terminal of the first sampling unit 101, and can output the collected signal 1 on the circuit loop where the first sampling unit 101 is located. The collected signal 1 can be IA+. Specifically, the fourth end of the first sampling unit 101 can be connected to the input terminal of the signal modulation circuit 11 through a wire, and the fourth end of the first sampling unit 101 can be connected to the input terminal of the metering signal processing circuit 12 through a wire.

[0068] As Figure 4As shown, the first end of the second sampling unit 102 can be used to access a second input current, where the second input current can be another current output from the secondary side of a high-precision metering iron core current transformer. The third end of the second sampling unit 102 can be grounded, and the fourth end of the second sampling unit 102 can be respectively connected to the input end of the signal modulation circuit 11 and the input end of the metering signal processing circuit 12. The fourth end of the second sampling unit 102 is the output end of the second sampling unit 102 and can output the acquisition signal 2 on the circuit loop where the second sampling unit 102 is located. The acquisition signal 2 can be IA-. Specifically, the fourth end of the second sampling unit 102 can be connected to the input end of the signal modulation circuit 11 through a wire, and the fourth end of the second sampling unit 102 can be connected to the input end of the metering signal processing circuit 12 through a wire.

[0069] In this embodiment, the current signal collected by the sampling circuit can be directly connected to the metering signal processing circuit, which can make the sampling accuracy obtained by the metering signal processing circuit higher, and thus the metering accuracy can be higher.

[0070] Continue to refer to Figure 4 As Figure 4 shown, the first sampling unit 101 may include: a first sampling resistor 1011, a first diode 1012, and a second diode 1013; the second sampling unit 102 may include: a second sampling resistor 1021, a third diode 1022, and a fourth diode 1023.

[0071] Optionally, one end of the first sampling resistor 1011 and one end of the second sampling resistor 1021 are respectively used for grounding, and the other end of the first sampling resistor 1011 can be respectively connected to the positive electrode end of the first diode 1012, the input end of the signal modulation circuit 11, and the input end of the metering signal processing circuit 12.

[0072] Optionally, the negative electrode end of the first diode 1012 can be used to connect the positive electrode end of the second diode 1013 and the first input current, and the negative electrode end of the second diode 1013 can be connected to the negative electrode end of the fourth diode 1023.

[0073] Optionally, the other end of the second sampling resistor 1021 can be respectively connected to one end of the third diode, the input end of the signal modulation circuit 11, and the input end of the metering signal processing circuit 12. The negative electrode end of the third diode 1022 can be respectively connected to the positive electrode end of the fourth diode 1023 and the second input current.

[0074] Please refer to Figure 5 which is a schematic structural diagram of a signal modulation circuit provided by the present utility model. As Figure 5As shown, the signal modulation circuit 11 may include a first input resistor 110 , a second input resistor 111 , a first feedback resistor 112 , and an operational amplifier unit 113 .

[0075] Optionally, one end of the first input resistor 110 is connected to the other end of the first sampling resistor 1011, then one end of the first input resistor 110 can receive the acquisition signal 1 outputted from the other end of the first sampling resistor 1011, the other end of the first input resistor is respectively connected to one end of the first feedback resistor 112, the other end of the second input resistor 111 and the negative input end of the operational amplifier unit 113, one end of the second input resistor 111 can be connected to the other end of the second sampling resistor 1021, then one end of the second input resistor 111 can receive the acquisition signal 2 outputted from the other end of the second sampling resistor 1021, the other end of the second input resistor 111 is respectively connected to one end of the first feedback resistor 112 and the negative input end of the operational amplifier unit 113. The composition of the first input resistor 110, the second input resistor 111 and the first feedback resistor 112 can amplify or reduce the input acquisition signal.

[0076] Optionally, the other end of the first feedback resistor 112 is connected to the output end of the operational amplifier unit 113, and the output end of the operational amplifier unit 113 can be used to output a protection signal, and the positive input end of the operational amplifier unit 113 is used for grounding. The protection signal is a superimposed protection signal obtained by superimposing the acquisition signal 1 and the acquisition signal 2 input by the signal modulation circuit 11. For example, Figure 6 As shown, Figure 6 The IA+ waveform is the acquisition signal 1, and the IA- waveform is the acquisition signal 2. After superimposing the acquisition signal 1 and the acquisition signal 2, the IA+ and IA- superimposed waveforms are obtained, which are the protection signals.

[0077] In this embodiment, the acquisition signal 1 and the acquisition signal 2 input by the signal modulation circuit are superimposed by the addition modulation circuit, so that the signal modulation circuit outputs a superimposed protection signal, so that the pulsating DC signal for protection is directionless, so there is no need to raise the reference power supply of the signal to provide a reference signal, thereby simplifying the circuit and circuit cost.

[0078] Please refer to Figure 7 , is a schematic diagram of a structure of a metering signal processing circuit provided by an embodiment of the utility model, such as Figure 7 As shown, the metering signal processing circuit 12 may include: a first filtering unit 120 , a second filtering unit 121 and a metering chip 122 .

[0079] like Figure 7As shown, the input end of the first filtering unit 120 is connected to the output end of the sampling circuit 10, and the output end of the first filtering unit 120 is connected to the metering chip 122. Then, the first filtering unit 120 can receive the acquisition signal output from the output end of the sampling circuit 10, filter the received acquisition signal, and input the filtered acquisition signal into the metering chip 122, so that the metering chip 122 calculates the acquisition signal to obtain metering data.

[0080] Among them, the input end of the second filtering unit 121 is connected to the output end of the sampling circuit 10, and the output end of the second filtering unit 121 is connected to the metering chip 122. Then, the second filtering unit 121 can receive the acquisition signal output from the output end of the sampling circuit 10, filter the received acquisition signal, and input the filtered acquisition signal into the metering chip 122, so that the metering chip 122 calculates the acquisition signal to obtain metering data.

[0081] Continue to refer to Figure 7 As shown, the first filtering unit 120 may include a first filtering resistor 1200 and a first filtering capacitor 1201; the second filtering unit 121 may include a second filtering resistor 1210 and a second filtering capacitor 1211.

[0082] As Figure 7 shown, the first filtering resistor 1200, the second filtering resistor 1210, the first filtering capacitor 1201, the second filtering capacitor 1211, and the metering chip 122.

[0083] Among them, one end of the first filtering resistor 1200 is connected to the output end of the sampling circuit 10. Specifically, one end of the first filtering resistor 1200 may be connected to the other end of the first sampling resistor 1011. Then, one end of the first filtering resistor 1200 can receive the acquisition signal 1 output from the other end of the first sampling resistor 1011. The other end of the first filtering resistor 1200 is respectively connected to one end of the first filtering capacitor 1201 and the metering chip 123, and the other end of the first filtering capacitor 1201 is grounded. Then, the input acquisition signal 1 is filtered by the first filtering resistor 1200 and the first filtering capacitor 1201, and the filtered acquisition signal 1 is output and input into the metering chip 123.

[0084] Optionally, one end of the second filtering resistor 1210 is connected to the output end of the sampling circuit 10. Specifically, one end of the second filtering resistor 1210 can be connected to the other end of the second sampling resistor 1021. Then, one end of the second filtering resistor 1210 can receive the acquisition signal 2 output from the other end of the second sampling resistor 1021, and the other end of the second filtering resistor 1210 can be respectively connected to one end of the second filtering capacitor 1211 and the metering chip 123. Then, the input acquisition signal 2 is filtered by the second filtering resistor 1210 and the second filtering capacitor 1211, and the filtered acquisition signal 2 is output to the metering chip 123.

[0085] Optionally, after the metering chip 123 receives the filtered acquisition signal 1 and the filtered acquisition signal 2, differential calculation is performed to output metering data. Exemplarily, after performing differential calculation on the IA+ waveform and the IA- waveform in Figure 6 to obtain the IA+ and IA- differential waveforms, it is the output metering data.

[0086] In this embodiment, by directly inputting the two acquisition signals collected in the sampling circuit into the metering signal processing circuit, and connecting them to the metering chip after RC filtering, the metering accuracy can be improved, and the influence caused by passing through multiple operational amplifiers can be avoided.

[0087] Optionally, through Figures 3 to 7 the connections between the various circuits in, a circuit solution of a circuit breaker of the present invention is formed. Next, another circuit breaker circuit solution will be specifically introduced.

[0088] Please refer to Figure 8 , which is a schematic structural diagram of another sampling circuit provided by an embodiment of the present invention. As Figure 8 shown, the sampling circuit in Figure 8 is a different solution from the sampling circuits in the aforementioned Figure 3 and Figure 4 . The sampling circuit 10 may include a third sampling resistor 103 and a fourth sampling resistor 104.

[0089] Optionally, one end of the third sampling resistor 103 can be used to connect to the first input current, the input end of the signal modulation circuit 11, and the input end of the metering signal processing circuit 12, and the other end of the third sampling resistor 103 can be used to ground.

[0090] Optionally, one end of the fourth sampling resistor 104 can be used to ground, the input end of the signal modulation circuit 11, and the input end of the metering signal processing circuit 12, and the other end of the fourth sampling resistor 104 can be used to ground. Among them, the other end of the third sampling resistor 103 can be connected to the other end of the fourth sampling resistor 104.

[0091] The sampling circuit in this embodiment and Figure 4 the sampling circuit in

[0092] Please refer to Figure 9 , which is a schematic structural diagram of another signal modulation circuit provided by an embodiment of the present invention. For the sampling circuit in Figure 8 , connect to Figure 9 the signal modulation circuit in Figure 9 , then the signal modulation circuit in Figure 8 modulates the acquisition signal output by the sampling circuit in Figure 9 and outputs a protection signal. As shown in

[0093] As shown in Figure 9 , the input end of the first inverting proportional op-amp unit 114 of the first inverting proportional op-amp unit 114 can be connected to one end of the third sampling resistor 103, and can receive the acquisition signal 1 output from one end of the third sampling resistor 103, and modulate the received acquisition signal 1 to obtain the modulated acquisition signal 1. The output end of the first inverting proportional op-amp unit 114 of the first inverting proportional op-amp unit 114 is connected to the output end of the second inverting proportional op-amp unit 115 of the second inverting proportional op-amp unit 115. The output end of the first inverting proportional op-amp unit 114 of the first inverting proportional op-amp unit 114 can be used to output a protection signal. The input end of the second inverting proportional op-amp unit 115 can be connected to one end of the fourth sampling resistor 104, and can receive the acquisition signal 2 output from one end of the fourth sampling resistor 104, and can modulate the received acquisition signal 2 to obtain the modulated acquisition signal 2. Then, by connecting the output end of the first inverting proportional op-amp unit 114 of the first inverting proportional op-amp unit 114 to the output end of the second inverting proportional op-amp unit 115 of the second inverting proportional op-amp unit 115, the modulated acquisition signal 1 and the modulated acquisition signal 2 are superimposed, thereby outputting a protection signal.

[0094] Continue to refer to Figure 9 , as shown in Figure 9 , the first inverting proportional op-amp unit 114 may include a third input resistor 1140, a second feedback resistor 1141, and a first op-amp module 1142; the second inverting proportional op-amp unit 115 may include a fourth input resistor 1150, a third feedback resistor 1151, and a second op-amp module 1152.

[0095] Optionally, one end of the third input resistor 1140 is connected to one end of the third sampling resistor 103, and can receive the acquisition signal 1 output from one end of the third sampling resistor 103, that is, IA+. The other end of the third input resistor 1140 is respectively connected to the negative input terminal of the first operational amplifier module 1142 and one end of the second feedback resistor 1141. The other end of the second feedback resistor 1141 can be respectively connected to the output terminal of the first operational amplifier module 1142 and the output terminal of the second operational amplifier module 1152. The output terminals of the first operational amplifier module 1142 and the second operational amplifier module 1152 can be used to output a protection signal, and the output protection signal is input into an analog-to-digital converter, and the protection signal is subjected to analog-to-digital conversion by the analog-to-digital converter. The positive input terminal of the first operational amplifier module 1142 is grounded.

[0096] Optionally, one end of the fourth input resistor 1150 can be connected to one end of the fourth sampling resistor 104, and the other end of the fourth input resistor can be respectively connected to the first terminal of the second operational amplifier module 1152 and one end of the third feedback resistor 1151. The other end of the third feedback resistor 1151 can be respectively connected to the second terminal of the first operational amplifier module 1142 and the output terminal of the second operational amplifier module 1152. The output terminals of the first operational amplifier module 1142 and the second operational amplifier module 1152 can be used to output a protection signal, and the positive input terminal of the second operational amplifier module 1152 is grounded.

[0097] Exemplarily, as Figure 10 shown, the acquisition signal 1 can be input into the first operational amplifier module 1142, and the first operational amplifier module 1142 performs reverse modulation on the input acquisition signal 1. The modulated acquisition signal 1 is like the waveform of IA+ after passing through the operational amplifier as shown in Figure 10 . The acquisition signal 2 can be input into the second operational amplifier module 1152, and the second operational amplifier module 1152 performs reverse modulation on the input acquisition signal 2. Exemplarily, for the signal modulation circuit, the modulated acquisition signal 2 is like the waveform of IA- after passing through the operational amplifier as shown in Figure 10 . Then, the modulated acquisition signal 1 and the modulated acquisition signal 2 are superimposed, and a protection signal can be obtained, which is the superimposed waveform as shown in Figure 10 .

[0098] In this embodiment, two inverting proportional operational amplifier units are respectively used to modulate the input acquisition signal 1 and the acquisition signal 2, and the modulated acquisition signal 1 and the modulated acquisition signal 2 are superimposed, so as to be used as the output of the signal modulation circuit. There is no need to raise the reference power supply of the signal, which simplifies the circuit and reduces the cost.

[0099] Please refer to Figure 11 , which is a connection schematic diagram of another measurement signal processing circuit provided by an embodiment of the present invention. As shown in Figure 9As shown, for the metering signal processing circuit 12 in this solution, the design of the metering signal processing circuit 12 is the same as that of the metering signal processing circuit 12 described above. For the connection of the metering signal processing circuit 12, specifically, one end of the first filter resistor 1200 can be connected to one end of the third sampling resistor 103. Then, one end of the first filter resistor 1200 can receive the acquisition signal 1 output from one end of the third sampling resistor 103. The other end of the first filter resistor 1200 is respectively connected to one end of the first filter capacitor 1201 and the metering chip 122. The other end of the first filter capacitor 1201 is used for grounding. Then, the input acquisition signal 1 is filtered by the first filter resistor 1200 and the first filter capacitor 1201, and the filtered acquisition signal 1 is output and output to the metering chip 122.

[0100] Optionally, one end of the second filter resistor 1210 can be connected to one end of the fourth sampling resistor 104. Then, one end of the second filter resistor 1210 can receive the acquisition signal 2 output from one end of the fourth sampling resistor 104. The other end of the second filter resistor 1210 can be respectively connected to one end of the second filter capacitor 1211 and the metering chip 123. Then, the input acquisition signal 2 is filtered by the second filter resistor 1210 and the second filter capacitor 1211, and the filtered acquisition signal 2 is output and output to the metering chip 123.

[0101] Optionally, after the metering chip 123 receives the filtered acquisition signal 1 and the filtered acquisition signal 2, metering data is output through differential calculation. Exemplarily, for the metering signal processing circuit, such as performing differential calculation on the IA+ waveform and the IA- waveform in Figure 10 to obtain the IA+ and IA- differential waveforms, which are the output metering data.

[0102] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention.

Claims

1. A circuit breaker device, characterized in that, The device includes: a sampling circuit, a signal modulation circuit, and a metering signal processing circuit; The input end of the sampling circuit is used to access an input current, and the output end of the sampling circuit is respectively connected to the input end of the signal modulation circuit and the input end of the metering signal processing circuit; The signal modulation circuit is used to collect the current signal of the sampling circuit via the output end of the sampling circuit, superimpose the collected current signals, and output a protection signal; The metering signal processing circuit collects the current signal of the sampling circuit via the output end of the sampling circuit, and outputs metering data based on the collected current signal.

2. The circuit breaker device according to claim 1, characterized in that, The sampling circuit includes: a first sampling unit and a second sampling unit; The first end of the first sampling unit is used to access a first input current, the second end of the first sampling unit is connected to the second end of the second sampling unit, the third end of the first sampling unit is used to ground, and the fourth end of the first sampling unit is respectively connected to the input end of the signal modulation circuit and the input end of the metering signal processing circuit; The first end of the second sampling unit is used to access a second input current, the third end of the second sampling unit is used to ground, and the fourth end of the second sampling unit is respectively connected to the input end of the signal modulation circuit and the input end of the metering signal processing circuit.

3. The circuit breaker device according to claim 2, characterized in that, The first sampling unit includes: a first sampling resistor, a first diode, and a second diode; the second sampling unit includes a second sampling resistor, a third diode, and a fourth diode; One end of the first sampling resistor and one end of the second sampling resistor are respectively used to connect to ground, and the other end of the first sampling resistor is respectively connected to the positive electrode end of the first diode, the input end of the signal modulation circuit, and the input end of the metering signal processing circuit; The negative electrode end of the first diode is used to connect to the positive electrode end of the second diode and the first input current, and the negative electrode end of the second diode is used to connect to the negative electrode end of the fourth diode; The other end of the second sampling resistor is respectively connected to the positive electrode end of the third diode, the input end of the signal modulation circuit, and the input end of the metering signal processing circuit; The negative electrode end of the third diode is respectively used to connect to the positive electrode end of the fourth diode and the second input current.

4. The circuit breaker device according to claim 3, characterized in that, The signal modulation circuit includes a first input resistor, a second input resistor, a first feedback resistor, and an operational amplifier unit; One end of the first input resistor is connected to the other end of the first sampling resistor, and the other end of the first input resistor is respectively connected to one end of the first feedback resistor and the negative input end of the operational amplifier unit; One end of the second input resistor is connected to the other end of the second sampling resistor, and the other end of the second input resistor is respectively connected to one end of the first feedback resistor and the negative input end of the operational amplifier unit; The other end of the first feedback resistor is connected to the output end of the operational amplifier unit, the positive input end of the operational amplifier unit is used to ground, and the output end of the operational amplifier unit is used to output a superimposed protection signal.

5. The circuit breaker device according to claim 1, characterized in that, The sampling circuit includes: a third sampling resistor and a fourth sampling resistor; One end of the third sampling resistor is used to connect to the first input current, the input end of the signal modulation circuit, and the input end of the metering signal processing circuit, and the other end of the third sampling resistor is used to connect to ground; One end of the fourth sampling resistor is used to connect to the second input current, the input end of the signal modulation circuit, and is connected to the input end of the metering signal processing circuit, and the other end of the fourth sampling resistor is used to connect to ground.

6. The circuit breaker device according to claim 5, characterized in that, The signal modulation circuit includes: a first inverting proportional op-amp unit and a second inverting proportional op-amp unit; The input end of the first inverting proportional op-amp unit is connected to one end of the third sampling resistor, the output end of the first inverting proportional op-amp unit is connected to the other end of the second inverting proportional op-amp unit, and the output end of the first inverting proportional op-amp unit is used to output a modulation signal; The input end of the second inverting proportional op-amp unit is connected to one end of the fourth sampling resistor.

7. The circuit breaker device according to claim 6, characterized in that, The first inverting proportional op-amp unit includes: a third input resistor, a second feedback resistor, and a first op-amp module; One end of the third input resistor is connected to one end of the third sampling resistor, and the other end of the third input resistor is respectively connected to the negative input end of the first op-amp module and one end of the second feedback resistor; The other end of the second feedback resistor is respectively connected to the output end of the first op-amp module and the output end of the second op-amp module, and the positive input end of the first op-amp module is used to connect to ground.

8. The circuit breaker device according to claim 6, characterized in that, The second inverting proportional op-amp unit includes: a fourth input resistor, a third feedback resistor, and a second op-amp module; One end of the fourth input resistor is connected to one end of the fourth sampling resistor, and the other end of the fourth input resistor is respectively connected to the negative input end of the second op-amp module and one end of the third feedback resistor; The other end of the third feedback resistor is respectively connected to the output end of the first op-amp module and the output end of the second op-amp module, and the positive input end of the second op-amp module is used to connect to ground.

9. The circuit breaker device according to any one of claims 1-8, characterized in that The metering signal processing circuit includes: a first filtering unit, a second filtering unit, and a metering chip; The input end of the first filtering unit is connected to the output end of the sampling circuit, and the output end of the first filtering unit is connected to the metering chip; The input end of the second filtering unit is connected to the output end of the sampling circuit, and the output end of the second filtering unit is connected to the metering chip.

10. The circuit breaker device according to claim 9, characterized in that, The first filtering unit includes: a first filtering resistor and a first filtering capacitor; the second filtering unit includes: a second filtering resistor and a second filtering capacitor; One end of the first filtering resistor is connected to the output end of the sampling circuit, the other end of the first filtering resistor is respectively connected to one end of the first filtering capacitor and the metering chip, and the other end of the first filtering capacitor is used to connect to ground; One end of the second filter resistor is connected to the output end of the sampling circuit. The other end of the second filter resistor is respectively connected to one end of a second filter capacitor and a metering chip, and the other end of the second filter capacitor is grounded.

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