CN219999026U - Circuit breaker system - Google Patents

Abstract

The present utility model provides a circuit breaker system, comprising: the electromagnetic switch unit is arranged on the power circuit and is configured to control the power circuit to be turned on or turned off; a current detection unit coupled to the power supply loop, the current detection unit configured to detect an operating current in the power supply loop; the short-circuit protection unit comprises a first comparator and a second comparator, wherein the inverting input end of the first comparator is connected with a first preset voltage, and the non-inverting input end of the second comparator is connected with a second preset voltage; the first preset voltage is larger than the second preset voltage, the non-inverting input end of the first comparator and the inverting input end of the second comparator are coupled to the output end of the current detection unit, and the output ends of the first comparator and the second comparator are coupled to the control end of the electromagnetic switch unit. The utility model can realize the identification and judgment of the short-circuit current in two directions and the short-circuit protection.

Description

Circuit breaker system

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a circuit breaker system.

Background

The circuit breaker is a switching device capable of closing, bearing and switching on and off current under normal loop conditions, and at present, the circuit breaker mainly indirectly controls the power loop to be turned on or off through an electromagnetic switching unit, for example, when the electromagnetic switching unit is electrified, the electromagnetic switching unit generates a magnetic attraction switch so as to enable the power loop to be turned on; and when the electromagnetic switch unit is disconnected, the electromagnetic switch unit releases the switch so as to disconnect the power supply loop.

The existing circuit breaker is generally provided with a short-circuit protection unit, when the short-circuit protection unit recognizes that a short-circuit current exists in a power circuit, the short-circuit protection unit directly controls the electromagnetic switch unit to disconnect the power circuit so as to realize short-circuit protection, and the phenomenon of equipment damage is avoided. However, in the double-sided power network, there are two directions of short-circuit current, for example, the short-circuit current flows from the bus bar to the line, and there may be short-circuit current flowing from the line to the bus bar, and how to perform short-circuit protection control on the two directions of current is a direction of efforts of those skilled in the art.

Disclosure of Invention

The utility model provides a circuit breaker system, which aims to solve the technical problem of how to realize short-circuit protection control on short-circuit currents in two directions.

In a first aspect, the present utility model provides a circuit breaker system comprising:

the electromagnetic switch unit is arranged on the power circuit and is configured to control the power circuit to be turned on or turned off;

a current detection unit coupled to the power supply loop, the current detection unit configured to detect an operating current in the power supply loop;

the short-circuit protection unit comprises a first comparator and a second comparator, wherein the inverting input end of the first comparator is connected with a first preset voltage, and the non-inverting input end of the second comparator is connected with a second preset voltage;

the first preset voltage is larger than the second preset voltage, the non-inverting input end of the first comparator and the inverting input end of the second comparator are coupled to the output end of the current detection unit, and the output ends of the first comparator and the second comparator are coupled to the control end of the electromagnetic switch unit.

In some embodiments, the short circuit protection unit further comprises a first or gate;

the output ends of the first comparator and the second comparator are coupled to the input end of the first OR gate, and the output end of the first OR gate is coupled to the control end of the electromagnetic switch unit.

In some embodiments, the outputs of the first comparator and the second comparator are coupled to the second input of the first or gate, and the second input of the first or gate is shorted to the output of the first or gate.

In some embodiments, the first comparator output is coupled to a first input of the first or gate, and the second comparator output is coupled to a second input of the first or gate;

the first input end of the first or gate is short-circuited with the output end of the first or gate, and the second input end of the first or gate is short-circuited with the output end of the first or gate.

In some embodiments, the electromagnetic switch unit includes a first MOS transistor and an electromagnetic coil;

one end of the electromagnetic coil is connected with the power supply end, the other end of the electromagnetic coil is grounded through the first MOS tube, and the control end of the electromagnetic switch unit comprises a grid electrode of the first MOS tube.

In some embodiments, the electromagnetic switch unit further includes a second MOS transistor, and the electromagnetic coil is connected to the power supply terminal through the second MOS transistor.

In some embodiments, the electromagnetic switch unit further comprises a photocoupler and a first triode;

the base electrode of the first triode is connected with a control signal, the emitter electrode of the first triode is coupled to the grounding end, and the collector electrode of the first triode is coupled to the cathode end of the photoelectric coupler;

the anode end of the photoelectric coupler is coupled to the power supply end, the collector of the photoelectric coupler is coupled to the power supply end, and the emitter of the photoelectric coupler is coupled to the grid electrode of the second MOS tube.

In some embodiments, the circuit breaker system further comprises a coil drive holding unit;

the coil drive holding unit is used for supplying constant current to the electromagnetic switch unit after the electromagnetic switch unit is in a conducting state.

In some embodiments, the coil drive holding unit includes a first switch and a constant current source;

one end of the constant current source is connected with the power end, the other end of the constant current source is connected with the first switch, and one end of the first switch, deviating from the constant current source, is connected with the electromagnetic switch unit.

In some embodiments, the circuit breaker system further comprises a voltage detection unit for the voltage of the power supply loop.

In the utility model, when the voltage of the output signal of the current detection unit is larger than a first preset voltage, the current detection unit is indicated to identify the forward fault current in the double-side power supply network, and the first comparator outputs a high-level signal at the moment, so that the electromagnetic switch unit can be controlled to be disconnected to realize the forward short-circuit current protection; when the voltage of the output signal of the current detection unit is smaller than the second preset voltage, the current detection unit recognizes the reverse fault current in the double-side power supply network, and the second comparator outputs a high-level signal at the moment, so that the electromagnetic switch unit can be controlled to be disconnected to realize reverse short-circuit current protection. On one hand, the short-circuit protection unit can realize the identification and judgment of the short-circuit current in two directions and the short-circuit protection, and on the other hand, the position of the short-circuit fault equipment can be rapidly judged by utilizing the signals output by the first comparator and the second comparator in the double-side power supply network, and the specific short-circuit fault equipment is closer to the power supply on the side, so that the fault position can be rapidly positioned and salvaged by an maintainer.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic circuit diagram of a short-circuit protection unit provided in an embodiment of the present utility model;

FIG. 2 is a schematic circuit diagram of an electromagnetic switching unit provided in an embodiment of the present utility model;

fig. 3 is a schematic block diagram of a circuit breaker system provided in an embodiment of the utility model.

The device comprises a 10 electromagnetic switch unit, a 20 current detection unit, a 30 short-circuit protection unit, a 40 coil drive holding unit, a 50 control unit, a 60 drive unit, a 70 voltage detection unit, an 80 power supply unit and a 90 communication unit;

the device comprises a first MOS tube Q3, a photoelectric coupler U1, a first triode Q2, a first switch S1, a constant current source IS, a second MOS tube Q1, a first comparator U3, a second comparator U4, a first OR gate U2 and an electromagnetic coil MC.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the utility model with unnecessary detail. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

The embodiment of the utility model provides a circuit breaker system, which is described in detail below.

Referring first to fig. 1 and 2, fig. 1 shows a schematic circuit diagram of a short-circuit protection unit according to an embodiment of the present utility model, and fig. 2 shows a schematic circuit diagram of an electromagnetic switch unit according to an embodiment of the present utility model, wherein a circuit breaker system includes:

the electromagnetic switch unit 10 is arranged on the power circuit and is configured to control the power circuit to be turned on or turned off;

a current detection unit 20, the current detection unit 20 being coupled to the power supply loop, the current detection unit 20 being configured to detect an operating current in the power supply loop;

the short-circuit protection unit 30, the short-circuit protection unit 30 includes a first comparator U3 and a second comparator U4, the inverting input end of the first comparator U3 is connected with a first preset voltage, and the non-inverting input end of the second comparator U4 is connected with a second preset voltage;

wherein the first preset voltage is greater than the second preset voltage, the non-inverting input terminal of the first comparator U3 and the inverting input terminal of the second comparator U4 are coupled to the output terminal of the current detection unit 20, and the first comparator and the output terminal of the second comparator U4 of U3 are coupled to the control terminal of the electromagnetic switch unit 10.

Specifically, the electromagnetic switch unit 10 refers to a switch unit that indirectly controls the switch to be closed by an electromagnetic effect. Generally, the electromagnetic switch unit 10 includes an electromagnetic portion and a switch portion having an elastic member (e.g., a spring or rubber) that keeps it in a normally open state or a normally closed state. Taking the case that the switch part is kept in a normally open state, when the electromagnetic switch unit 10 is electrified, the electromagnetic part generates magnetic attraction switch to enable the electromagnetic switch unit 10 to be closed; in contrast, when the electromagnetic switch unit 10 is powered off, the magnetic force of the electromagnetic portion disappears to release the switch, and the elastic force of the elastic member pulls the switch to be turned off so that the electromagnetic switch unit 10 is turned off.

The electromagnetic switching unit 10 may be a device having an electromagnetic switching function such as a relay or a contactor, for example. It will be appreciated that the switching section may also be in a normally closed state, with the magnetic force of the electromagnetic section being generated to repel the switching section, thereby causing the switching section to open.

The current detecting unit 20 is used for detecting the working current in the power circuit so as to judge whether the working current in the power circuit is larger than the overload current or short circuit current interruption. Generally, the output signal of the current detecting unit 20 is a voltage signal, so as to determine whether an overload or a short circuit phenomenon occurs in the power supply circuit through the comparator of the short circuit protection unit 30. Illustratively, the current detection unit 20 may perform current measurement using hall, TMR (tunnel magnetoresistance), fluxgate, rogowski coil, or the like principle; alternatively, the current detection unit 20 may be realized by a shunt.

The short-circuit protection unit 30 is configured to determine whether the working current is a short-circuit current, so as to send out a control signal and control the electromagnetic switch unit 10 to be turned off. Specifically, the short-circuit protection unit 30 includes a first comparator U3 and a second comparator U4, and the two comparators can determine fault currents in two directions at the same time, so long as one of the first comparator U3 and the second comparator U4 outputs a high-level signal, the electromagnetic switch unit 10 can be turned off, and finally, the accuracy of the short-circuit protection unit 30 for determining fault currents is ensured.

In the embodiment of the present utility model, when the voltage of the signal output by the current detection unit 20 is greater than the first preset voltage, it is indicated that the current detection unit 20 recognizes a forward fault current (such as a forward short-circuit current or an overload current) in the double-sided power network, and at this time, the first comparator U3 outputs a high-level signal, so that the electromagnetic switch unit 10 can be controlled to be turned off to realize forward short-circuit current protection; when the voltage of the output signal of the current detection unit 20 is smaller than the second preset voltage, it is indicated that the current detection unit 20 recognizes the reverse fault current in the double-sided power network, and the second comparator U4 outputs a high-level signal at this time, so that the electromagnetic switch unit 10 can be controlled to be turned off to realize the reverse short-circuit current protection. On one hand, the short-circuit protection unit can realize the identification and judgment of the short-circuit current in two directions and the short-circuit protection, and on the other hand, the position of the short-circuit fault equipment can be rapidly judged by utilizing the signals output by the first comparator U3 and the second comparator U4 in the double-side power supply network, and the specific short-circuit fault equipment is closer to the power supply on the side, so that the fault position can be rapidly positioned and salvaged by an maintainer.

For example, the first preset voltage is 3.5V, the second preset voltage is 1.5V, and when the voltage of the output signal of the current detection unit 20 is 2.5V, the first comparator U3 and the second comparator U4 both output low-level signals at this time, which indicates that the working current in the power supply loop is normal, and no fault current exists; when the voltage of the output signal of the current detection unit 20 is 3.8V, the first comparator U3 outputs a high level signal, and the second comparator U4 outputs a low level signal, which indicates that a forward fault current exists in the power supply loop; when the voltage of the output signal of the current detecting unit 20 is 1.3V, the first comparator U3 outputs a low level signal and the second comparator U4 outputs a high level signal, which indicates that there is a reverse fault current in the power supply loop.

In some embodiments of the present utility model, the current detection unit 20 may detect the current in two directions by using a hall type current sensor of a unipolar power source, for example, a hall type CC6920 hall sensor of the company, inc, which can output a positive voltage signal when detecting both the forward fault current and the reverse fault current, so that the first comparator U3 and the second comparator U4 can determine that they are within the positive level threshold. In some embodiments of the present utility model, the current detection unit 20 may also employ a hall type current sensor of a bipolar power source to detect currents in two directions.

In some embodiments of the present utility model, with continued reference to fig. 1, the short-circuit protection unit 30 further includes a first or gate U2; the output terminals of the first comparator U3 and the second comparator U4 are coupled to the input terminal of the first or gate U2, and the output terminal of the first or gate U2 is coupled to the control terminal of the electromagnetic switch unit 10. More specifically, the output terminals of the first comparator U3 and the second comparator U4 are coupled to the second input terminal of the first or gate U2, and the second input terminal of the first or gate U2 is shorted to the output terminal of the first or gate U2.

It should be noted that the short-circuit fault may occur instantaneously and then be eliminated, so that the short-circuit current may suddenly rise instantaneously and be greatly reduced after the electromagnetic switch unit is turned off. In the above embodiment, after the output ends of the first comparator U3 and the second comparator U4 output the high-level signal, the first input end of the first or gate U2 receives the high-level signal, and then the output end of the first or gate U2 outputs the high-level signal, and since the second input end of the first or gate U2 is coupled to the output end of the first or gate U2, the second output end of the first or gate U2 also receives the high-level signal, and thus the first or gate U2 is in a self-locking state, and the output end of the first or gate U2 continuously outputs the high-level signal and is not affected by the subsequent output signals of the output ends of the first comparator U3 and the second comparator U4, so that the phenomenon that a short circuit cannot be effectively detected and judged under the condition that the short circuit current rises instantly and drops rapidly can be avoided.

In other embodiments of the present utility model, the output of the first comparator U3 is coupled to the first input of the first or gate U2, and the output of the second comparator U4 is coupled to the second input of the first or gate U2; the first input end of the first or gate U2 is short-circuited with the output end of the first or gate U2, and the second input end U2 of the first or gate U2 is short-circuited with the output end of the first or gate. That is, the output terminals of the first comparator U3 and the second comparator U4 may be coupled to the two input terminals of the first or gate U2, respectively, while shorting the two input terminals of the first or gate U2 to the output terminals thereof, and the first or gate U2 is in a self-locking state, regardless of whether the first comparator U3 or the second comparator U4 provides the high level signal to the first or gate U2, the two input terminals of the first or gate U2 are maintained in the high level state.

In some embodiments of the present utility model, with continued reference to fig. 2, the electromagnetic switch unit 10 includes a first MOS transistor Q3 and an electromagnetic coil MC; one end of the electromagnetic coil MC is connected with the power supply end, the other end of the electromagnetic coil MC is grounded through the first MOS tube Q3, and the control end of the electromagnetic switch unit 10 comprises a grid electrode of the first MOS tube Q3. Taking the first MOS transistor Q3 as an example, when a short circuit fault is found, the first comparator U3 or the second comparator U4 provides a high-level signal to the first or gate U2, and the high-level signal output by the first or gate U2 can directly control the first MOS transistor Q3 to be disconnected, so that the electromagnetic coil MC disconnects the loop, and finally, short circuit protection of the circuit breaker is realized.

It can be understood that the first MOS transistor Q3 may also be an NMOS transistor, and the first MOS transistor Q3 is controlled by inverting the output signal of the first or gate U2.

In some embodiments of the present utility model, with continued reference to fig. 2, the electromagnetic switch unit 10 further includes a second MOS transistor Q1, and the electromagnetic coil MC is connected to the power supply terminal through the second MOS transistor Q1. That is, the output signal of the first or gate U2 may further control the second MOS transistor Q1, so that the electromagnetic coil MC is disconnected from the power supply terminal during the short circuit, and the electromagnetic coil MC is fully powered off.

In some embodiments, the electromagnetic switch unit 10 further includes a photo coupler U1 and a first transistor Q2; the base electrode of the first triode Q2 is connected with a control signal, the emitter electrode of the first triode Q2 is coupled to the grounding end, and the collector electrode of the first triode Q2 is coupled to the cathode end of the photoelectric coupler U1; the anode terminal of the photo-coupler U1 is coupled to the power supply terminal, the collector of the photo-coupler U1 is coupled to the power supply terminal, and the emitter of the photo-coupler U1 is coupled to the gate of the second MOS transistor Q1.

Specifically, after the base electrode of the first triode Q2 is connected to the control signal, the base electrode of the first triode Q2 flows into the current, so that the first triode Q2 is turned on, thereby enabling the light emitting source of the photoelectric coupler U1 to emit light, further enabling the light receiver of the photoelectric coupler U1 to be turned on, and enabling the collector electrode of the photoelectric coupler U1 to be turned on, thereby enabling the grid electrode of the second MOS tube Q1 to receive the level signal and be turned on, and finally enabling the electromagnetic switch unit 10 to be communicated with the power supply. Meanwhile, as the photoelectric coupler U1 has the function of signal isolation, the interference of control signals on other electronic elements (such as the second MOS tube Q1) can be avoided.

In some embodiments of the present utility model, with continued reference to fig. 2, the circuit breaker system further includes a coil drive holding unit 40; the coil drive holding unit 40 is used to supply a constant current to the electromagnetic switching unit 10 after the electromagnetic switching unit 10 is in the on state.

It should be noted that, since the magnitude of the electromagnetic force is related to the magnitude of the current, the electromagnetic switch unit 10 generally has a preset safe holding current and a preset minimum holding current, where the preset minimum holding current is a minimum current at which the electromagnetic switch unit 10 is closed, the preset safe holding current is greater than the preset minimum holding current (e.g. greater than 2A), and the preset safe holding current is a current in a normal operating state of the electromagnetic switch unit 10. When the current level of the electromagnetic switch unit 10 is equal to the preset safety holding current, the magnetic force generated by the electromagnetic switch unit 10 is greater than the elastic force (for example, greater than 10N) of the corresponding elastic piece (for example, the spring), so that the electromagnetic switch unit 10 is ensured to be in a stable closed state; when the current level of the electromagnetic switch unit 10 is equal to the preset minimum holding current, the magnetic force generated by the electromagnetic switch unit 10 is basically equal to the elastic force of the corresponding elastic member (e.g. spring), and if the current of the electromagnetic switch unit 10 is further reduced, the electromagnetic switch unit 10 is turned off. Since the electromagnetic switch unit 10 generates heat after being energized to increase the resistance, thereby causing the current through the electromagnetic switch unit 10 to decrease, when the current of the electromagnetic switch unit 10 decreases to a preset minimum holding current, there is a risk that the electromagnetic switch unit 10 trips.

In the above embodiment, since the coil driving holding unit 40 supplies the constant current to the electromagnetic switch unit 10 after the electromagnetic switch unit 10 is turned on, the current of the electromagnetic switch unit 10 is not reduced by self-heating after the electromagnetic switch unit 10 is turned on, thereby avoiding the bouncing or even the disconnection of the electromagnetic switch unit 10 due to the reduced holding current.

As an example, with continued reference to fig. 2, the coil drive holding unit 40 may include a first switch S1 and a constant current source IS; one end of the constant current source IS connected with the power supply end, the other end IS connected with the first switch S1, and one end of the first switch S1 away from the constant current source IS connected with the electromagnetic switch unit 10. When the first switch S1 IS closed, the constant current source IS may provide a constant current to the electromagnetic switch unit 10, so that the electromagnetic switch unit 10 maintains a stable closed state under the support of the constant current.

It will be appreciated that the coil drive holding unit 40 may also supply a constant current by other means, for example, the coil drive holding unit 40 may include a resistance having a negative temperature coefficient, the resistance decreasing in magnitude after the temperature rises so that the sum of the resistance and the coil resistance of the electromagnetic switching unit 10 remains unchanged, thereby outputting a constant current at a fixed voltage; for another example, the coil drive holding unit 40 increases the voltage with an increase in the coil resistance to output a constant current.

In some embodiments of the present utility model, with continued reference to fig. 3, fig. 3 shows a block schematic diagram of an interrupt circuit breaker system according to an embodiment of the present utility model, wherein the circuit breaker system further comprises a control unit 50 and a drive unit 60; the control unit 50 and the short-circuit protection unit 30 are coupled to the driving unit 60, the driving unit 60 is coupled to the gate of the first MOS transistor Q3, and the current detection unit 20 is coupled to the control unit 50.

It should be noted that, the control unit 50 may be implemented by using a micro control chip (single chip microcomputer), and in the specific implementation, the control unit 50 only needs to select a single chip microcomputer capable of implementing the function from the prior art, and is not limited to any type, for example, a single chip microcomputer of STM32F103 series of ST corporation, and the control program is well known to those skilled in the art, and can be obtained by those skilled in the art without performing creative labor. The driving unit 60 may include a gate driver, in+ of which is connected to the PWM signal of the control unit 50, IN-of which is connected to the output signal of the short-circuit protection unit 30 (e.g. the output signal of the first or gate U2), and the output of which is capable of outputting the control signal for controlling the first MOS transistor Q3. That is, by providing the gate driver, on one hand, the control unit 50 may control the first MOS transistor Q3 through the gate driver, and on the other hand, when a short-circuit current occurs, the short-circuit protection unit 30 may directly control the first MOS transistor Q3 through the gate driver, so as to ensure that the short-circuit protection of the circuit breaker system is timely realized.

It should be noted that the above description of the circuit breaker system is intended to clearly illustrate the implementation verification process of the present utility model, and in fact, the circuit breaker system may further include other functional modules, for example, referring to fig. 3, wherein the circuit breaker system may further include a communication unit 90 to transmit circuit breaker operation data, such as short circuit record data, overload record data, leakage record data, etc.; for another example, the circuit breaker system may further include a voltage detection unit 70, and a power supply unit 80, etc., the voltage detection unit 70 may detect the voltage of the power supply loop, and the power supply unit 80 may supply power to other units (e.g., the control unit 50, the short-circuit protection unit 30); for another example, the partial circuit may be provided with resistors for voltage conversion and a zener diode, and as shown in fig. 2, the electromagnetic switch unit 10 may be provided with resistors R1, R2, R3, R4, R5, R6, R7, and R8, zener diodes D1 and D2, a capacitor C1, and the like.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the utility model may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present utility model uses specific words to describe embodiments of the present utility model. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the utility model. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the utility model may be combined as suitable.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject utility model. Indeed, less than all of the features of a single embodiment disclosed above.

In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited herein is hereby incorporated by reference in its entirety except for any application history file that is inconsistent or otherwise conflict with the present disclosure, which places the broadest scope of the claims in this application (whether presently or after it is attached to this application). It is noted that the description, definition, and/or use of the term in the appended claims controls the description, definition, and/or use of the term in this utility model if there is a discrepancy or conflict between the description, definition, and/or use of the term in the appended claims.

The above description of a circuit breaker system provided by the embodiment of the present utility model has been provided in detail, and specific examples are applied herein to illustrate the principles and embodiments of the present utility model, and the above description of the embodiments is only for helping to understand the method and core idea of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.

Claims (10)

1. A circuit breaker system, comprising:

the electromagnetic switch unit is arranged on the power circuit and is configured to control the power circuit to be turned on or turned off;

a current detection unit coupled to the power supply loop, the current detection unit configured to detect an operating current in the power supply loop;

the short-circuit protection unit comprises a first comparator and a second comparator, wherein the inverting input end of the first comparator is connected with a first preset voltage, and the non-inverting input end of the second comparator is connected with a second preset voltage;

the first preset voltage is greater than the second preset voltage, the non-inverting input end of the first comparator and the inverting input end of the second comparator are coupled to the output end of the current detection unit, and the output ends of the first comparator and the second comparator are coupled to the control end of the electromagnetic switch unit.

2. The circuit breaker system of claim 1, wherein the short circuit protection unit further comprises a first or gate;

the output ends of the first comparator and the second comparator are coupled to the input end of the first OR gate, and the output end of the first OR gate is coupled to the control end of the electromagnetic switch unit.

3. The circuit breaker system of claim 2, wherein the output of the first comparator and the second comparator are coupled to a second input of the first or gate, and the second input of the first or gate is shorted to the output of the first or gate.

4. The circuit breaker system of claim 2, wherein the first comparator output is coupled to a first input of the first or gate and the second comparator output is coupled to a second input of the first or gate;

the first input end of the first OR gate is short-circuited with the output end of the first OR gate, and the second input end of the first OR gate is short-circuited with the output end of the first OR gate.

5. The circuit breaker system of claim 1, wherein the electromagnetic switching unit comprises a first MOS transistor and an electromagnetic coil;

one end of the electromagnetic coil is connected with the power supply end, the other end of the electromagnetic coil is grounded through the first MOS tube, and the control end of the electromagnetic switch unit comprises a grid electrode of the first MOS tube.

6. The circuit breaker system of claim 5, wherein the electromagnetic switch unit further comprises a second MOS transistor, the electromagnetic coil being connected to a power source terminal via the second MOS transistor.

7. The circuit breaker system of claim 6, wherein the electromagnetic switching unit further comprises a photo coupler and a first transistor;

the base electrode of the first triode is connected with a control signal, the emitter electrode of the first triode is coupled to the grounding end, and the collector electrode of the first triode is coupled to the cathode end of the photoelectric coupler;

the anode end of the photoelectric coupler is coupled to the power supply end, the collector electrode of the photoelectric coupler is coupled to the power supply end, and the emitter electrode of the photoelectric coupler is coupled to the grid electrode of the second MOS tube.

8. The circuit breaker system of any one of claims 1 to 7, further comprising a coil drive holding unit;

the coil drive holding unit is used for providing constant current to the electromagnetic switch unit after the electromagnetic switch unit is in a conducting state.

9. The circuit breaker system of claim 8, wherein the coil drive holding unit comprises a first switch and a constant current source;

one end of the constant current source is connected with the power source end, the other end of the constant current source is connected with the first switch, and one end of the first switch, which is away from the constant current source, is connected with the electromagnetic switch unit.

10. The circuit breaker system of any one of claims 1 to 7, further comprising a voltage detection unit for the voltage of the power supply loop.