Switching circuit and relay system

Abstract

The application provides a switching circuit and a relay system. The switching circuit comprises a solid-state switch module, a mechanical switch module connected in parallel with the solid-state switch module, and a interlock control module. An input end of the interlock control module is connected with the mechanical switch module, and an output end of the interlock control module is connected with a control end of the solid-state switch module. The interlock control module is used for controlling the solid-state switch module to be closed for a preset time when the mechanical switch module starts to be opened, and the preset time is greater than or equal to the opening time of the mechanical switch module. The application can avoid the phenomenon that high-voltage arc is generated in the opening process of the mechanical switch due to the switching logic error of the mechanical switch and the solid-state switch.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to a switching circuit and a relay system. BACKGROUND

[0002] At present, due to the characteristics of the short-circuit fault current, such as fast rising speed and large amplitude, if a mechanical circuit breaker is used to cut off the fault current, high-voltage arc will be generated at the moment of opening, and even the electrical equipment will be burned out in severe cases. As a special circuit breaker using power tube devices as breaking elements, the solid-state circuit breaker (SSCB) has the characteristics of no arc phenomenon and fast off speed compared with the traditional mechanical circuit breaker, so it has become a research hotspot in the field of circuit breakers.

[0003] However, the circuit breaker using only power tube devices as switches has the risk of power tube breakdown during short circuit, so the circuit control scheme using parallel mixed mechanical switches and solid-state switches is becoming more and more common. In the related art, the mechanical switch and the solid-state switch need to be triggered to close and off by independent power supply and trigger circuit, but this is easy to cause switching logic errors of the mechanical switch and the solid-state switch, for example, the solid-state switch is off before the mechanical switch is off, which will still produce high-voltage arc phenomenon when the mechanical switch is off. SUMMARY

[0004] The present application provides a switching circuit and a relay system, aiming to solve the technical problem that the mechanical switch and the solid-state switch are prone to switching logic errors.

[0005] In a first aspect, the present application provides a switching circuit, comprising:

[0006] a solid-state switch module;

[0007] a mechanical switch module, the mechanical switch module being connected in parallel with the solid-state switch module;

[0008] a interlocking control module, an input end of the interlocking control module being connected with the mechanical switch module, and an output end of the interlocking control module being connected with a control end of the solid-state switch module;

[0009] The interlocking control module is configured to control the solid-state switch module to close for a preset time when the mechanical switch module starts to open, and the preset time is greater than or equal to the opening time of the mechanical switch module.

[0010] In some embodiments, the mechanical switch module comprises an electromagnetic coil and an induction coil coupled with the electromagnetic coil.

[0011] The input end of the interlocking control module is connected with the induction coil, and when the induction coil generates an induced current, the interlocking control module provides a control voltage to the control end of the solid-state switch module.

[0012] In some embodiments, the interlocking control module comprises a rectifier module and a voltage stabilizing module.

[0013] The first input end and the second input end of the rectifier module are respectively connected with two ends of the induction coil, the output end of the rectifier module is connected with the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is connected with the control end of the solid-state switch module.

[0014] In some embodiments, the rectifier module comprises a rectifier bridge, and the voltage stabilizing module comprises a first capacitor.

[0015] The first input end and the second input end of the rectifier bridge are respectively connected with two ends of the induction coil.

[0016] The first output end of the rectifier bridge is connected with the first plate of the first capacitor, and the second output end of the rectifier bridge is connected with the second plate of the first capacitor.

[0017] The first plate of the first capacitor is grounded, and the second plate of the first capacitor is connected with the control end of the solid-state switch module.

[0018] In some embodiments, the solid-state switch module further comprises a first MOS tube and a second MOS tube.

[0019] The source of the first MOS tube is connected with the source of the second MOS tube, and the gate of the first MOS tube and the gate of the second MOS tube are connected with the output end of the interlocking control module.

[0020] The drain of the first MOS tube is connected with the power input end of the mechanical switch module, and the drain of the second MOS tube is connected with the power output end of the mechanical switch module.

[0021] In some embodiments, the solid-state switch module further comprises a first resistor.

[0022] The first end of the first resistor is connected to a first node between the source of the first MOS tube and the source of the second MOS tube, and the second end of the first resistor is connected with the output end of the interlocking control module.

[0023] The gate of the first MOS tube and the gate of the second MOS tube are connected with the second end of the first resistor, and the first node is grounded.

[0024] In some embodiments, the switch circuit further comprises a current detection module and a voltage control module, the current detection module is configured to detect the line current of the power line, and the input end of the voltage control module is connected with the output end of the current detection module.

[0025] The voltage control module provides a first preset voltage to the electromagnetic coil when the line current is less than a first preset value; and provides a second preset voltage to the electromagnetic coil when the line current is greater than or equal to the first preset value.

[0026] The second preset voltage is greater than the first preset voltage, so as to accelerate the disconnection speed of the mechanical switch module when the line current is greater than or equal to the first preset value.

[0027] In some embodiments, the voltage control module comprises a short-circuit judgment module and a voltage input module.

[0028] The input end of the short-circuit judgment module is connected with the output end of the current detection module, and the input end of the voltage input module is connected with the output end of the short-circuit judgment module.

[0029] The short-circuit judgment module outputs a control signal when the line current is greater than or equal to the first preset value, and the voltage input module provides the second preset voltage to the electromagnetic coil according to the control signal.

[0030] In some embodiments, the voltage input module comprises a first switch, and the short-circuit judgment module comprises a first comparator.

[0031] One end of the first switch is connected with the second preset voltage, and the other end is connected with the electromagnetic coil.

[0032] The non-inverting input end of the first comparator is connected with the output end of the current detection module, the inverting input end of the first comparator is connected with a first comparison voltage, and the output end of the first comparator is connected with the control end of the first switch.

[0033] In some embodiments, the short-circuit judgment module further comprises a second comparator.

[0034] The non-inverting input end of the second comparator is connected with the output end of the current detection module, the inverting input end of the first comparator is connected with a second comparison voltage, and the output end of the second comparator is connected with the control end of the first switch.

[0035] In some embodiments, the voltage control module further comprises a signal holding module.

[0036] The input end of the signal holding module is connected with the output end of the short-circuit judgment module, and the output end of the signal holding module is connected with the input end of the voltage input module.

[0037] The short-circuit judgment module outputs a first control signal for a first time period when the line current is greater than or equal to the first preset value, and the signal holding module outputs a second control signal for a second time period according to the first control signal, the second time period being greater than the first time period.

[0038] In some embodiments, the signal holding module comprises a first OR gate.

[0039] The first input end and the second input end of the first OR gate are connected with the output end of the short circuit judging module, and the output end of the first OR gate is connected with the input end of the voltage input module.

[0040] The first input end and / or the second input end of the first OR gate are connected with the output end.

[0041] In some embodiments, the electromagnetic coil comprises a first coil and a second coil.

[0042] The first coil is configured to control the mechanical switch module to close after being powered on, the second coil is configured to control the mechanical switch module to open after being powered on, and the induction coil is coupled with the second coil.

[0043] When the line current is less than a first preset value, the voltage control module provides a first preset voltage to the first coil and the second coil; when the line current is greater than or equal to the first preset value, the voltage control module provides a second preset voltage to the first coil and the second coil.

[0044] In some embodiments, the switching circuit further comprises a first control switch and a second control switch.

[0045] The first end of the first coil and the first end of the second coil are connected with the voltage control module.

[0046] The first end of the first control switch is connected with the second end of the first coil, and the second end of the first control switch is grounded; the first end of the second control switch is connected with the second end of the second coil, and the second end of the second control switch is grounded.

[0047] In some embodiments, the control end of the second control switch is connected with the voltage control module.

[0048] When the line current is greater than or equal to the first preset value, the voltage control module provides the second preset voltage to the second coil and controls the second control switch to repeatedly open and close, so that the second coil passes through a pulse current.

[0049] In a second aspect, the application provides a relay system comprising the switching circuit of the first aspect.

[0050] The application associates and controls the mechanical switch module and the solid-state switch module through the interlocking control module, and makes the solid-state switch module close for a preset time when the mechanical switch module starts to open. Since the preset time is greater than or equal to the opening time of the mechanical switch module, during the opening process of the mechanical switch module, the power line can pass through the current through the parallel and closed solid-state switch module, thereby avoiding the phenomenon that the high-voltage arc is generated in the opening process of the mechanical switch due to the logic error of the mechanical switch and the solid-state switch. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0052] Figure 1 is a module schematic diagram of a switch circuit provided in the embodiments of the present application;

[0053] Figure 2 is another module schematic diagram of a switch circuit provided in the embodiments of the present application;

[0054] Figure 3 is another module schematic diagram of a switch circuit provided in the embodiments of the present application;

[0055] Figure 4 is a circuit schematic diagram of a switch circuit provided in the embodiments of the present application;

[0056] Figure 5 is another module schematic diagram of a switch circuit provided in the embodiments of the present application;

[0057] Figure 6 is another module schematic diagram of a switch circuit provided in the embodiments of the present application;

[0058] Figure 7 is another circuit schematic diagram of a switch circuit provided in the embodiments of the present application;

[0059] Figure 8 is another circuit schematic diagram of a switch circuit provided in the embodiments of the present application;

[0060] Figure 9 is another circuit schematic diagram of a switch circuit provided in the embodiments of the present application;

[0061] Figure 10 is another module schematic diagram of a switch circuit provided in the embodiments of the present application;

[0062] Figure 11 is another circuit schematic diagram of a switch circuit provided in the embodiments of the present application;

[0063] Figure 12 is another module schematic diagram of a switch circuit provided in the embodiments of the present application;

[0064] Figure 13 is another module schematic diagram of a switch circuit provided in the embodiments of the present application;

[0065] Figure 14is another circuit schematic diagram of the switch circuit provided in the embodiments of the present application.

[0066] Wherein, 10 mechanical switch module, 20 solid state switch module, 30 interlocking control module, 11 electromagnetic coil, 12 inductive coil, 13 switch mechanism, 31 rectifier module, 32 voltage stabilizing module, 111 first coil, 112 second coil, 40 current detection module, 50 voltage control module, 51 short circuit judgment module, 52 voltage input module, 53 signal retention module, 54 voltage controlled oscillator, 60 control module;

[0067] Rectifier bridge D12, first capacitor C4, first MOS tube Q5, second MOS tube Q6, first resistor R16, first node M1;

[0068] First switch S1, first comparator U2, second comparator U3, first PMOS tube Q1, first NMOS tube Q2, first OR gate U1, first control switch Q3, second control switch Q4, first comparison voltage V01, second comparison voltage V02. DETAILED DESCRIPTION

[0069] The technical solutions in the embodiments of the present application will be described clearly and completely in the embodiments of the present application in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0070] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0071] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the application. For purposes of explanation, specific details are set forth in order to provide a thorough understanding of the application. It will be apparent to one skilled in the art, however, that the application can be practiced without the specific details presented herein. In other instances, well known structures and processes are not elaborated in order to avoid obscuring the subject matter of this application. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features presented herein.

[0072] The embodiments of the present application provide a switching circuit and a relay system, which are described in detail as follows.

[0073] First, refer to Figure 1 , Figure 1 A module schematic diagram of the switching circuit in the embodiments of the present application is shown, wherein the switching circuit comprises:

[0074] a solid-state switch module 20;

[0075] a mechanical switch module 10, the mechanical switch module 10 is connected in parallel with the solid-state switch module 20;

[0076] an interlocking control module 30, an input end of the interlocking control module 30 is connected with the mechanical switch module 10, and an output end of the interlocking control module 30 is connected with a control end of the solid-state switch module 20;

[0077] The interlocking control module 30 is configured to control the solid-state switch module 20 to be closed for a preset time when the mechanical switch module 10 starts to be opened, and the preset time is greater than or equal to an opening time of the mechanical switch module 10.

[0078] Specifically, the solid-state switch module 20 has a transistor with a switching function, for example, the solid-state switch module 20 can include a MOS tube, an IGBT tube or a JEFT tube, and the on-off control of the current on the power supply line is realized by the conduction or cut-off of the transistor. In some embodiments of the present application, the solid-state switch module 20 can include one transistor. In some other embodiments of the present application, the solid-state switch module 20 can include a plurality of transistors, for example, a plurality of series or parallel MOS tubes.

[0079] The mechanical switch module 10 controls the on-off of the power supply line through the switch mechanism 13, so as to realize the on-off control of the electrical equipment connected with the power supply line. The mechanical switch module 10 is connected in parallel with the solid-state switch module 20, that is, when one of the two is in the on state, the power supply line can still transmit power, for example, when the mechanical switch module 10 is off and the solid-state switch module 20 is closed, the power supply line can still transmit power; when both are in the off state, the power supply line can stop transmitting power.

[0080] In some embodiments of the present application, the mechanical switch module 10 has an electromagnetic coil 11 and a switch mechanism 13 (for example, a movable contact) for controlling the on-off of the power supply line according to the on-off of the electromagnetic coil 11. After the coil of the mechanical switch module 10 is powered on, the electromagnetic coil 11 generates a magnetic force to drive the switch mechanism 13 to open or close.

[0081] In some embodiments of the present application, the number of magnetic coils of the mechanical switch module 10 can be one, and the opening / closing control of the switch mechanism 13 is realized by controlling the flow direction of the current of the electromagnetic coil 11. For example, after the electromagnetic coil 11 is connected with a forward current, the electromagnetic coil 11 generates an attractive force on the switch mechanism 13 with a magnetic body, thereby attracting the switch mechanism 13 with a magnetic body to close; for another example, after the electromagnetic coil 11 is connected with a reverse current, the electromagnetic coil 11 generates a repulsive force on the switch mechanism 13 with a magnetic body, thereby repelling the switch mechanism 13 with a magnetic body to open.

[0082] In some embodiments of the present application, the number of electromagnetic coils 11 of the mechanical switch module 10 can be two, one electromagnetic coil 11 generates an attractive force on the switch mechanism 13 with a magnetic body after being powered on, thereby attracting the switch mechanism 13 with a magnetic body and closing; the other electromagnetic coil 11 generates a repulsive force on the switch mechanism 13 with a magnetic body after being powered on, thereby repelling the switch mechanism 13 with a magnetic body and opening.

[0083] Exemplarily, the mechanical switch module 10 can be a magnetic latching relay. It can be understood that the mechanical switch module 10 referred to in the present application is not limited to a magnetic latching relay, but can also refer to any electromagnetic relay that needs to be powered on by the electromagnetic coil 11 to control the disconnection of the line.

[0084] The interlock control module 30 can interlock control the solid state switch module 20 through the off signal of the mechanical switch module 10, so that the solid state switch module 20 is in a closed state during the process of the mechanical switch module 10 being disconnected, to avoid the phenomenon of high-voltage arc generated in the process of the mechanical switch module 10 being disconnected. Wherein, the solid state switch module 20 is controlled to be closed for a preset time when the mechanical switch module 10 starts to be disconnected, and the preset time is greater than or equal to the disconnection time of the mechanical switch module 10. For example, the disconnection time of the mechanical switch module 10 is 2ms to 5ms, and the preset time for the solid state switch module 20 to be closed can be set to 10ms when the mechanical switch module 10 starts to be disconnected.

[0085] It can be understood that the preset time can be adjusted according to actual needs by those skilled in the art, and the present application does not make specific limitations here.

[0086] In some embodiments of the present application, the interlock control module 30 can drive the solid state switch according to the control signal of the mechanical switch module 10, such as the control signal of the switch (for example, Q4) controlling the energization of the electromagnetic coil 11, to control the solid state switch module 20 to be closed for a preset time. In other embodiments of the present application, the interlock control module 30 can drive the solid state switch module 20 to be closed for a preset time according to the electromagnetic signal of the electromagnetic coil 11 of the mechanical switch module 10.

[0087] In the embodiments of the present application, the mechanical switch module 10 and the solid state switch module 20 are associated and controlled by the interlock control module 30, so that the solid state switch module 20 is closed for a preset time when the mechanical switch module 10 starts to be disconnected. Since the preset time is greater than or equal to the disconnection time of the mechanical switch module 10, during the process of the mechanical switch module 10 being disconnected, the power supply line can flow through the current through the parallel and closed solid state switch module 20, thereby avoiding the phenomenon of high-voltage arc generated in the process of the mechanical switch being disconnected due to the logic error of the mechanical switch and the solid state switch.

[0088] In some embodiments of the present application, for example, for the embodiment that the interlock control module 30 can drive the solid state switch module 20 to be closed for a preset time according to the electromagnetic signal of the electromagnetic coil 11 of the mechanical switch module 10, refer to Figure 2 , Figure 2 Another module schematic diagram of the switch circuit in the embodiments of the present application is shown, wherein the mechanical switch module 10 includes an electromagnetic coil 11 and an inductive coil 12 coupled with the electromagnetic coil 11; the input end of the interlock control module 30 is connected with the inductive coil 12, and when the inductive coil 12 generates an induced current, the interlock control module 30 provides a control voltage to the control end of the solid state switch module 20.

[0089] It should be noted that, since the electromagnetic coil 11 is coupled with the induction coil 12, when the electromagnetic coil 11 is supplied with the pulse current, the electromagnetic coil 11 can generate the magnetic force and drive the switch mechanism 13 to start to be disconnected, and meanwhile the induction coil 12 can also generate the induced current, so that the interlocking control module 30 provides the control voltage to the control end of the solid-state switch module 20, and finally drives the solid-state switch to be connected for the preset time, so as to avoid the phenomenon of high-voltage arc generated in the process of mechanical switch being disconnected.

[0090] In some embodiments of the present application, an alternating power supply can be provided to supply the pulse current to the electromagnetic coil 11. In some other embodiments of the present application, a direct current power supply and a switch for controlling whether the direct current power supply is connected to the electromagnetic coil can also be provided, and the switch is repeatedly closed and opened to supply the pulse current to the electromagnetic coil 11, for example, as shown in FIG. 4, the direct current power supply VCC is connected to one end of the electromagnetic coil 11, and the other end of the electromagnetic coil 11 is connected to the control switch (Q3, Q4) grounded, and the control switch (Q3, Q4) is repeatedly closed and opened to supply the pulse current to the electromagnetic coil 11. Figure 2

[0091] In some embodiments of the present application, continuing to refer to FIG. 3, Figure 3 Figure 3 FIG. 5 shows another module schematic diagram of the switch circuit in the embodiments of the present application, the interlocking control module 30 includes a rectifier module 31 and a voltage stabilizing module 32; the first input end and the second input end of the rectifier module 31 are respectively connected to the two ends of the induction coil 12, the output end of the rectifier module 31 is connected to the input end of the voltage stabilizing module 32, and the output end of the voltage stabilizing module 32 is connected to the control end of the solid-state switch module 20.

[0092] Specifically, after the electromagnetic coil 11 is supplied with the pulse current, the induction coil 12 will generate the varying induced current, the rectifier module 31 can convert the induced current output from the two ends of the induction coil 12 into the pulse current with the current direction remaining unchanged, and the voltage stabilizing module 32 can filter the pulse current output from the rectifier module 31, so that the pulse current is converted into the direct current, and finally a stable voltage is output, so as to control the solid-state switch module 20 through the stable voltage. Exemplarily, the rectifier module 31 can include a half-wave rectifier circuit, a full-wave rectifier circuit or a bridge rectifier circuit, etc.; the voltage stabilizing module 32 can include a capacitor or an inductor, etc.

[0093] As an example, referring to FIG. 5, Figure 4 Figure 4 ​​​A circuit schematic of the switching circuit in the embodiments of the present application is shown, wherein the rectifying module 31 includes a rectifier bridge D12, and the voltage stabilizing module 32 includes a first capacitor C4; the first input end and the second input end of the rectifier bridge D12 are respectively connected with two ends of the induction coil 12; the first output end of the rectifier bridge D12 is connected with the first plate of the first capacitor C4, and the second output end of the rectifier bridge D12 is connected with the second plate of the first capacitor C4; the first plate of the first capacitor C4 is grounded, and the second plate of the first capacitor C4 is connected with the control end of the solid-state switching module 20.

[0094] It should be noted that the rectifier bridge D12 can convert the induction current output from the two ends of the induction coil 12 into a pulse current signal. Since the first output end of the rectifier bridge D12 is connected with the first plate of the first capacitor C4, and the second output end of the rectifier bridge D12 is connected with the second plate of the first capacitor C4, when the pulse current signal is a rising edge, the pulse current signal charges the first capacitor C4, and when the pulse current signal is a falling edge, the first capacitor C4 can be discharged, thereby converting the pulse current signal into a smooth direct current signal, and then using the stable voltage to control the solid-state switching module 20.

[0095] It can be understood that an inductor can also be used to filter the pulse signal and obtain a smooth voltage signal, for example, an inductor is connected in series with the first output end of the rectifier bridge D12 to filter the pulse current signal through the inductor.

[0096] In some embodiments of the present application, continuing to refer to Figure 4 The voltage stabilizing module 32 can further include a voltage stabilizing diode D11 connected in parallel with the first capacitor C4, so that the voltage difference between the two ends of the first capacitor C4 is maintained at a certain threshold value (for example, 5V), to avoid the first capacitor C4 providing an excessively high voltage to the control end of the solid-state switching module 20 (for example, the gate of the first MOS tube Q5 and the second MOS tube Q6), thereby causing the transistors of the solid-state switching module 20 to break down.

[0097] In some embodiments of the present application, continuing to refer to Figure 4 The solid-state switching module 20 further includes a first MOS tube Q5 and a second MOS tube Q6; the source of the first MOS tube Q5 is connected with the source of the second MOS tube Q6, and the gates of the first MOS tube Q5 and the second MOS tube Q6 are connected with the output end of the interlocking control module 30; the drain of the first MOS tube Q5 is connected with the power input end of the mechanical switch module 10, and the drain of the second MOS tube Q6 is connected with the power output end of the mechanical switch module 10.

[0098] Specifically, after the interlocking control module 30 converts the induced current of the induction coil 12 into a control signal, the gates of the first MOS tube Q5 and the second MOS tube Q6 receive the control signal, thereby driving the first MOS tube Q5 and the second MOS tube Q6 to be turned on. During the process of disconnecting the mechanical switch module 10, the current of the power supply circuit can flow through the first MOS tube Q5 and the second MOS tube Q6, thereby avoiding the high-voltage arc phenomenon generated during the process of disconnecting the mechanical switch module 10.

[0099] It can be understood that the solid-state switch module 20 can also be provided with a larger number of switches, such as MOS tubes, IGBT tubes, or JEFT tubes, etc.

[0100] In some embodiments of the present application, continuing to refer to Figure 4 The solid-state switch module 20 further includes a first resistor R16. A first end of the first resistor R16 is connected to a first node M1 between the source of the first MOS tube Q5 and the source of the second MOS tube Q6, and a second end of the first resistor R16 is connected to the output end of the interlocking control module 30. The gates of the first MOS tube Q5 and the second MOS tube Q6 are connected to the second end of the first resistor R16, and the first node M1 is grounded. That is, the first end of the first resistor R16 is connected to the source of the first MOS tube Q5 and the source of the second MOS tube Q6 and is grounded, and the gates of the first MOS tube Q5 and the second MOS tube Q6 are connected to the second end of the first resistor R16, so that the source and the gate of the first MOS tube Q5 and the second MOS tube Q6 can maintain a fixed voltage difference. After the first resistor R16 receives the voltage signal of the first capacitor C4, the first MOS tube Q5 and the second MOS tube Q6 can be driven to be turned on by the voltage difference between the source and the gate. At the same time, since the first end of the first resistor R16 is grounded, the charge stored in the first capacitor C4 can be slowly released through the first resistor R16, and the gate voltage of the first MOS tube Q5 and the second MOS tube Q6 gradually decreases. Finally, after the charge stored in the first capacitor C4 is completely released, the first MOS tube Q5 and the second MOS tube Q6 are turned off, and the process of releasing the charge and reducing the voltage of the first capacitor C4 can make the first MOS tube Q5 and the second MOS tube Q6 maintain the on state for a preset time.

[0101] As can be understood by those skilled in the art, by adjusting the capacitance value of the first capacitor C4 and the resistance value of the first resistor R16, the first MOS tube Q5 and the second MOS tube Q6 can be ensured to maintain the on state for a preset time, i.e., the first MOS tube Q5 and the second MOS tube Q6 maintain the on state during the process of disconnecting the mechanical switch module 10, thereby ensuring that no arc is generated during the process of disconnecting the mechanical switch module 10.

[0102] It should be noted that, due to the coupling between the induction coil 12 and the electromagnetic coil 11, the induction coil 12 generates a reverse magnetic field after the electromagnetic coil 11 is energized. This weakens the magnetic force on the switching mechanism 13 and prolongs the disconnection time of the mechanical switch module 10. While this phenomenon does not significantly affect normal switching operations, a prolonged disconnection speed of the mechanical switch module 10 can easily damage electrical equipment in the event of a short-circuit fault. To address this issue, please refer to the following content.

[0103] In some embodiments of this application, see further reference. Figure 5 , Figure 5 Another schematic diagram of the switching circuit in this embodiment is shown. The switching circuit further includes a current detection module 40 and a voltage control module 50. The current detection module 40 is configured to detect the magnitude of the line current of the power supply line. The input terminal of the voltage control module 50 is connected to the output terminal of the current detection module 40. When the line current is less than a first preset value, the voltage control module 50 provides a first preset voltage V1 to the electromagnetic coil 11. When the line current is greater than or equal to the first preset value, the voltage control module 50 provides a second preset voltage V2 to the electromagnetic coil 11. The second preset voltage V2 is greater than the first preset voltage V1, so as to accelerate the disconnection speed of the mechanical switch module 10 when the line current is greater than or equal to the first preset value.

[0104] Specifically, the current detection module 40 can detect the magnitude of the line current in the power supply line, thereby determining whether there is a fault in the electrical equipment connected to the power supply line, such as short-circuit current caused by a short circuit or overload current caused by a decrease in load impedance. Generally, the output signal of the current detection module 40 is a voltage signal, which can be used by the comparator of the voltage control module 50 to determine whether there is an overload or short circuit in the power supply circuit.

[0105] In some embodiments of this application, the current detection module 40 can be connected in series with the power line to directly measure the line current. For example, a fixed resistor can be connected in series with the power line, and the line current can be obtained by measuring the voltage across the fixed resistor. In some embodiments of this application, the current detection module 40 can also be mounted on the power line to indirectly measure the line current. For example, the current detection module 40 can include a current transformer to indirectly measure the current in the power line.

[0106] Understandably, the current detection module 40 can also use the principles of Hall effect, TMR (tunneling reluctance), fluxgate or Rogowski coil for current measurement; or, the current detection module 40 can also be implemented through a shunt.

[0107] The voltage control module 50 can control the voltage input to the electromagnetic coil 11 of the mechanical switch module 10 according to the line current. When the line current is less than a first preset value (for example, 5 A), the voltage control module 50 provides a first preset voltage V1 (for example, 5 V) to the electromagnetic coil 11; when the line current is greater than or equal to the first preset value (for example, 5 A), the voltage control module 50 provides a second preset voltage V2 (for example, 10 V) to the electromagnetic coil 11. When the line current is too large, the second preset voltage V2 with a larger voltage can make the electromagnetic coil 11 generate a larger magnetic force, thereby accelerating the opening speed of the switch mechanism 13, and finally achieving the purpose of short-circuit protection of the electrical equipment.

[0108] In some embodiments of the present application, referring to Figure 6 , Figure 6 Another module schematic diagram of the switch circuit in the embodiments of the present application is shown, wherein the voltage control module 50 includes a short-circuit judgment module 51 and a voltage input module 52; the input end of the short-circuit judgment module 51 is connected with the output end of the current detection module 40, and the input end of the voltage input module 52 is connected with the output end of the short-circuit judgment module 51; when the line current is greater than or equal to the first preset value, the short-circuit judgment module 51 outputs a control signal, and the voltage input module 52 provides the second preset voltage V2 to the electromagnetic coil 11 according to the control signal, so as to quickly disconnect the mechanical switch module 10.

[0109] As an example, referring to Figure 7 , Figure 7 A circuit schematic diagram of the switch circuit in the embodiments of the present application is shown, wherein the voltage input module 52 includes a first switch S1, one end of the first switch S1 is connected with the second preset voltage V2, and the other end is connected with the electromagnetic coil 11; when the line current is greater than or equal to the first preset value, the short-circuit judgment module 51 outputs a control signal, and the first switch S1 is closed under the action of the control signal, so as to make the electromagnetic coil 11 connected with the second preset voltage V2.

[0110] Continuing to refer to Figure 7The short-circuit judging module 51 can comprise a first comparator U2, the non-inverting input of the first comparator U2 is connected with the output of the current detecting module 40, the inverting input of the first comparator U2 is connected with a first comparison voltage V01, and the output of the first comparator U2 is connected with the control of the first switch S1. The current detecting module 40 detects the line current of the power supply line and outputs a corresponding voltage signal, and the voltage signal is compared with the first comparison voltage V01 by the first comparator U2 to output a control signal. For example, the first comparison voltage V01 is 2V, the voltage signal outputted by the current detecting module 40 is 2.1V when the line current is equal to the first preset value, the voltage of the non-inverting input of the first comparator U2 is greater than the voltage of the inverting input, the output of the first comparator U2 outputs a high level signal, thereby the first switch S1 is controlled to be closed and the electromagnetic coil 11 is connected with the second preset voltage V2.

[0111] In some embodiments of the present application, referring to Figure 7 The voltage input module 52 further comprises a single-phase diode D11, the positive electrode of the single-phase diode D11 is connected with the first preset voltage V1, and the negative electrode of the single-phase diode D11 is connected with the electromagnetic coil 11. When the first switch S1 is closed, the electromagnetic coil 11 is connected with the second preset voltage V2, and the current does not flow back to the first preset voltage V1 due to the single-phase diode D11. Conversely, when the first switch S1 is opened, the electromagnetic coil 11 is connected with the first preset voltage V1 again.

[0112] It can be understood that the voltage input module 52 can further comprise two switches to control the electromagnetic coil 11 to be connected with the first preset voltage V1 or the second preset voltage V2. For example, referring to Figure 8 , Figure 8 Another circuit schematic diagram of the switch circuit in the embodiments of the present application is shown, wherein the voltage input module 52 comprises a first switch S1 and a second switch S2, one end of the first switch S1 is connected with the second preset voltage V2, and the other end is connected with the electromagnetic coil 11; one end of the second switch S2 is connected with the first preset voltage V1, and the other end is connected with the electromagnetic coil 11. When the high level signal outputted by the first comparator U2 controls the first switch S1 to be closed and the second switch S2 to be opened, the electromagnetic coil 11 is connected with the second preset voltage V2; conversely, when the low level signal outputted by the first comparator U2 controls the first switch S1 to be opened and the second switch S2 to be closed, the electromagnetic coil 11 is connected with the first preset voltage V1.

[0113] For example, the first switch S1 and the second switch S2 can be MOS tubes, IGBT tubes or triodes and other transistors with switching function.

[0114] In some embodiments of the present application, referring to Figure 9 ,Figure 9 Another circuit schematic of the switch circuit in the embodiment of the application is shown, wherein the short circuit judgment module 51 further comprises a second comparator U3; the inverting input end of the second comparator U3 is connected with the output end of the current detection module 40, the non-inverting input end of the first comparator U2 is connected with the second comparison voltage V02, and the output end of the second comparator U3 is connected with the control end of the first switch S1.

[0115] It should be noted that in the double-sided power supply network, there are two directions of short circuit current, for example, the short circuit current direction is from the bus to the line, and there can also be short circuit current from the line to the bus. In the above embodiment, when the voltage of the output signal of the current detection module 40 is greater than the first comparison voltage V01, it indicates that the current detection module 40 identifies the forward fault current (such as the forward short circuit current or overload current) in the double-sided power supply network, at this time the first comparator U2 outputs a high level signal, so that the electromagnetic coil 11 of the mechanical switch module 10 is connected to the second preset voltage V2 and quickly disconnected, to realize the forward short circuit current protection; and when the voltage of the output signal of the current detection module 40 is less than the second comparison voltage V02, it indicates that the current detection module 40 identifies the reverse fault current in the double-sided power supply network, at this time the second comparator U3 outputs a high level signal, so that the electromagnetic coil 11 of the mechanical switch module 10 is connected to the second preset voltage V2 and quickly disconnected, to realize the reverse short circuit current protection.

[0116] That is, in one aspect, the above short circuit judgment module 51 can realize the identification and judgment of the short circuit current in two directions and the short circuit protection, and in another aspect, the signals output by the first comparator U2 and the second comparator U3 in the double-sided power supply network can also quickly judge the position of the short circuit fault device, that is, which side of the power supply the short circuit fault device is closer to, so as to facilitate the maintenance personnel to quickly locate the fault position and carry out rush repair.

[0117] Exemplarily, the first comparison voltage V01 is 3.5V, the second comparison voltage V02 is 1.5V, when the voltage of the output signal of the current detection module 40 is 2.5V, at this time the first comparator U2 and the second comparator U3 both output low level signals, indicating that the working current in the power supply loop is normal, and there is no fault current; when the voltage of the output signal of the current detection module 40 is 3.8V, at this time the first comparator U2 outputs a high level signal and the second comparator U3 outputs a low level signal, indicating that there is a forward fault current in the power supply loop; when the voltage of the output signal of the current detection module 40 is 1.3V, at this time the first comparator U2 outputs a low level signal and the second comparator U3 outputs a high level signal, indicating that there is a reverse fault current in the power supply loop.

[0118] In some embodiments of this application, the current detection module 40 can detect currents in two directions using a Hall-effect current sensor with a unipolar power supply, such as the CC6920 Hall-effect sensor from Chengdu Xinjin Electronics Co., Ltd. This type of Hall-effect current sensor can output a positive voltage signal when detecting both forward and reverse fault currents, allowing the first comparator U2 and the second comparator U3 to make judgments within a positive level threshold. In some embodiments of this application, the current detection module 40 can also detect currents in two directions using a Hall-effect current sensor with a bipolar power supply.

[0119] In some embodiments of this application, see further reference. Figure 10 , Figure 10 Another schematic diagram of the switching circuit in this application embodiment is shown, wherein the voltage control module 50 further includes a signal holding module 53; the input terminal of the signal holding module 53 is connected to the output terminal of the short circuit judgment module 51, and the output terminal of the signal holding module 53 is connected to the input terminal of the voltage input module 52; when the line current is greater than or equal to a first preset value, the short circuit judgment module 51 outputs a first control signal for a first time period, and the signal holding module 53 outputs a second control signal for a second time period according to the first control signal, wherein the second time period is greater than the first time period.

[0120] It should be noted that a short circuit fault may occur and then disappear instantaneously. Therefore, the short circuit current may suddenly increase and then fluctuate around the first preset value. Thus, relying solely on the signal output by the comparator of the short circuit judgment module 51 cannot reliably control the first switch S1 to remain closed. In the above embodiment, the signal holding module 53 can output a second control signal for a second time period based on the first control signal. Since the second time period is longer than the first time period, the signal holding module 53 can output a stable second control signal, ensuring that the first switch S1 remains stably closed until the mechanical switch module 10 is completely disconnected. This avoids the phenomenon of the first switch S1 repeatedly opening and closing due to unstable control signals during a short circuit, which would ultimately lead to the mechanical switch module 10 repeatedly opening and closing.

[0121] Preferably, the second time period is longer than the time it takes for the mechanical switch module 10 to switch from the closed state to the open state, so as to ensure that the mechanical switch module 10 is completely disconnected after a short circuit current occurs.

[0122] As an example, see Figure 11 , Figure 11Another circuit schematic of the switch circuit in the embodiments of the present application is shown, wherein the signal maintaining module 53 comprises a first OR gate U1; the first input end and the second input end of the first OR gate U1 are connected with the output end of the short circuit judging module 51, and the output end of the first OR gate U1 is connected with the input end of the voltage input module 52; wherein the first input end and / or the second input end of the first OR gate U1 are connected with the output end.

[0123] Specifically, when the output ends of the first comparator U2 and the second comparator U3 output high level signals, the first input end and the second input end of the first OR gate U1 receive the high level signals, and then the output end of the first OR gate U1 outputs a high level signal. Since the first input end and the second input end of the first OR gate U1 are coupled to the output end of the first OR gate U1, the first input end, the second input end and the output end of the first OR gate U1 continuously input / output high level signals, and then the first OR gate U1 is in a self-locking state. The output end of the first OR gate U1 continuously outputs a high level signal and is not affected by the subsequent output signals of the output ends of the first comparator U2 and the second comparator U3, avoiding the phenomenon that the short circuit current cannot be effectively detected and judged in the case of instantaneous rise and rapid fall of the short circuit current.

[0124] In some embodiments of the present application, continuing to refer to Figure 11 , wherein the first switch S1 comprises a first PMOS tube Q1, and the voltage input module 52 further comprises a first NMOS tube Q2; the source of the first PMOS tube Q1 is connected with a second preset voltage V2, the drain of the first PMOS tube Q1 is connected with the electromagnetic coil 11, and the gate of the first PMOS tube Q1 is connected with the drain of the first NMOS tube Q2; the drain of the first NMOS tube Q2 is grounded, and the gate of the first NMOS tube Q2 is connected with the output end of the first comparator U2. Specifically, when the line current is greater than or equal to the first preset value and the first OR gate U1 outputs a high level signal, the first NMOS tube Q2 is turned on so that the gate of the first PMOS tube Q1 is grounded, and then the first PMOS tube Q1 is turned on, finally the electromagnetic coil 11 of the mechanical switch module 10 is connected with the second preset voltage V2 and realizes fast breaking.

[0125] It can be understood that the voltage input module 52 can further comprise a larger number of switches, such as a larger number of MOS tubes, transistors or IGBT tubes, etc., to indirectly control the closing or opening of the first switch S1.

[0126] In some embodiments of the present application, for example, for the embodiment that the mechanical switch module 10 is a magnetic latching relay, continuing to refer to Figure 12 , Figure 12Another circuit schematic of the switch circuit in the embodiments of the present application is shown, wherein the electromagnetic coil 11 includes a first coil 111 configured to control the mechanical switch module 10 to close after being powered on, and a second coil 112 configured to control the mechanical switch module 10 to open after being powered on, and the inductive coil 12 is coupled with the second coil 112; when the line current is less than a first preset value, the voltage control module 50 provides a first preset voltage V1 to the first coil 111 and the second coil 112; when the line current is greater than or equal to the first preset value, the voltage control module 50 provides a second preset voltage V2 to the first coil 111 and the second coil 112. That is, when the line current is small, the normal opening and closing process of the mechanical switch module 10 is controlled by the first preset voltage V1; and when the line current is large, the opening and closing process of the mechanical switch module 10 is controlled by the second preset voltage V2, so as to achieve the purpose of rapid disconnection when the line current is abnormal.

[0127] In some embodiments of the present application, continuing to refer to Figure 12 , the switch circuit further includes a first control switch Q3 and a second control switch Q4; a first end of the first coil 111 and a first end of the second coil 112 are connected with the voltage control module 50; a first end of the first control switch Q3 is connected with a second end of the first coil 111, and a second end of the first control switch Q3 is grounded; a first end of the second control switch Q4 is connected with a second end of the second coil 112, and a second end of the second control switch Q4 is grounded.

[0128] It should be noted that, since the first end of the first coil 111 and the first end of the second coil 112 are connected with the voltage control module 50, the first end of the first coil 111 and the first end of the second coil 112 can be connected with the first preset voltage V1 or the second preset voltage V2 under the control of the voltage control module 50, and whether the second end of the first coil 111 and the second end of the second coil 112 are grounded to form a loop is controlled by the first control switch Q3 and the second control switch Q4 respectively, and finally the purpose of controlling the opening and closing of the mechanical switch module 10 is achieved through the first control switch Q3 and the second control switch Q4. For example, when the voltage control module 50 provides the first preset voltage V1 to the first coil 111 and the second coil 112, and the first control switch Q3 is closed, the two ends of the first coil 111 form a loop so as to control the closing of the switch mechanism 13; for another example, when the voltage control module 50 provides the second preset voltage V2 to the first coil 111 and the second coil 112, and the second control switch Q4 is closed, the two ends of the second coil 112 form a loop so as to control the rapid opening of the switch mechanism 13.

[0129] Exemplarily, the first control switch Q3 and the second control switch Q4 can be MOS tubes, IGBT tubes or triodes, etc.

[0130] In some embodiments of the present application, in order to facilitate the control of the first control switch Q3 and the second control switch Q4, it is continued to refer to Figure 13 , Figure 13 Another schematic diagram of the switching circuit in the embodiments of the present application is shown, wherein the switching circuit further comprises a control module 60, a first output end of the control module 60 is connected with the control end of the first control switch Q3, and a second output end of the control module 60 is connected with the control end of the second control switch Q4. Specifically, the control module 60 can send a control signal to the control end of the first control switch Q3 and the control end of the second control switch Q4, so as to control the first control switch Q3 and the second control switch Q4 to be opened or closed, and further control the mechanical switch module 10 to be tripped and closed.

[0131] Exemplarily, the control signal can be a PWM signal or a clock signal, for example, when the control module 60 is a single-chip microcomputer, the PWM signal is output by the PWM port of the single-chip microcomputer; for another example, the control unit can comprise a triangular wave or sawtooth wave generator, and a high-frequency modulation wave is generated by using the triangular wave or sawtooth wave generator, and then a PWM signal is generated by a comparator.

[0132] In some embodiments of the present application, the control module 60 is connected with the current detection module 40, so as to obtain the line current data of the power supply line.

[0133] In some embodiments of the present application, it is continued to refer to Figure 13 , the control end of the second control switch Q4 is connected with the voltage control module 50, when the line current is greater than or equal to the first preset value, the voltage control module 50 provides the second preset voltage V2 to the second coil 112 and controls the second control switch Q4 to be repeatedly opened and closed, so as to make the second coil 112 pass through the pulse current to control the mechanical switch module 10 to be opened, and make the induced coil 12 generate the induced current and control the solid-state switch module 20 to be closed, finally directly control the mechanical switch module 10 to be quickly opened by the voltage control module 50, and make the solid-state switch module 20 remain in the closed state during the opening process of the mechanical switch module 10.

[0134] As an example, it is referred to Figure 14 , Figure 14Another circuit schematic of the switch circuit in the embodiments of the present application is shown. The voltage control module 50 further comprises a voltage-controlled oscillator 54, the input end of which is connected to the output end of the first OR gate U1, and the output end of which is connected to the control end of the second control switch Q4. When the first OR gate U1 outputs a high level signal, the voltage-controlled oscillator 54 outputs a pulse signal to control the second control switch Q4 to repeatedly open and close. At the same time, the second coil 112 is connected to the second preset voltage V2, so that the second coil 112 passes through a pulse current to control the mechanical switch module 10 to open, and the induction coil 12 generates an induced current to control the solid-state switch module 20 to close.

[0135] It can be understood that, referring to Figure 14 , the input end of the voltage-controlled oscillator 54 can also be connected to the output end of the first comparator U2 or the second comparator U3, and a high level signal provided by the output end of the first comparator U2 or the second comparator U3 is used to make the voltage-controlled oscillator 54 output a pulse signal.

[0136] In some embodiments of the present application, the control module 60 can also be connected to the output end of the first OR gate U1, and the high or low level signal output by the first OR gate U1 is used to determine whether the electromagnetic coil 11 of the circuit breaker is connected to the first preset voltage V1 or the second preset voltage V2. In some embodiments of the present application, the control module 60 can also be connected to the first input end and the second input end of the first OR gate U1, so that the control module 60 outputs a low level signal to make the first OR gate U1 release the self-locking state.

[0137] It is worth noting that the above-mentioned contents about the switch circuit are intended to clearly explain the implementation and verification process of the present application, and those skilled in the art can also make equivalent modifications and designs under the guidance of the present application. For example, referring to Figure 10 , the short circuit judgment module 51 can further be provided with capacitors C2 and C3 for voltage stabilization, and single-phase diodes D6 and D10 to prevent current backflow, and resistors R5, R9, R13 and R14 to generate a first comparison voltage V01 and a second comparison voltage V02; for another example, referring to Figure 14 , the signal retention module 53 can further be provided with a capacitor C1 for voltage stabilization, and a single-phase diode D4 to prevent current backflow; for another example, the voltage input module 52 can further be provided with R1 to maintain the voltage difference between the source and the gate of the first PMOS tube Q1, R4 to maintain the voltage difference between the source and the gate of the first NMOS tube Q2, and a capacitor C for voltage stabilization.

[0138] Meanwhile, it should be noted that the "connection" in the embodiments of the present application can be understood as an electrical connection, and the connection between two electrical elements can be direct or indirect connection between the two electrical elements. For example, A and B are connected, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements.

[0139] Further, in order to better implement the switch circuit in the embodiments of the present application, on the basis of the switch circuit, the present application further provides a relay control system, the relay control system comprising the switch circuit according to any one of the above embodiments. Since the relay control system in the embodiments of the present application is provided with the switch circuit in the above embodiments, it has all the beneficial effects of the above switch circuit, which will not be described here.

[0140] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the detailed description of other embodiments above, which will not be described here.

[0141] The above has described the basic concept, and it is obvious that the above detailed disclosure is only used as an example and does not constitute a limitation on the present application for those skilled in the art. Although it is not explicitly stated here, those skilled in the art can make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0142] Meanwhile, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0143] Similarly, it should be noted that in order to simplify the expression of the present application and to help understand one or more embodiments of the present application, sometimes multiple features are combined into one embodiment, figure or description of it in the foregoing description of the embodiments of the present application. However, this method of disclosure does not mean that the features required by the present application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the disclosed single embodiment.

[0144] In some embodiments, numbers that describe amounts, dimensions, and so forth, are used in the description of the embodiments. It should be understood that such numbers are used to describe embodiments and are not intended to limit the scope of the embodiments. In some examples, the numbers are modified by the modifier "about" or "approximately," and in some examples, the numbers are modified by the modifier "at least approximately." Unless otherwise indicated, "about," "approximately," or "at least approximately" means that the stated numerical value allows for ±20% variation. Accordingly, in some embodiments, numerical parameters in the specification and claims are approximations that can vary depending on the desired properties sought to be obtained by the individual embodiments. In some embodiments, numerical parameters are determined by the use of standard techniques, with appropriate modifications when necessary, to ascertain the most appropriate level and range of values.

[0145] Each patent, patent application, publication, document, article, book, instruction manual, and / or other material cited or referenced in this application is hereby incorporated by reference in its entirety for all purposes to the same extent as if each individual patent, patent application, publication, document, article, book, instruction manual, and / or other material were specifically and individually indicated to be incorporated by reference in its entirety for all purposes. In the event of inconsistencies between the disclosure of this application and the materials incorporated by reference, the disclosure of this application shall prevail.

[0146] The above describes in detail the switch circuit and the relay system provided by the embodiments of the present application. The principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the present application. In summary, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A switching circuit, characterized by, The application relates to a switch circuit. The switch circuit comprises: a mechanical switch module; a solid-state switch module connected in parallel with the mechanical switch module; an interlocking control module, an input end of the interlocking control module being connected with the mechanical switch module, and an output end of the interlocking control module being connected with a control end of the solid-state switch module; wherein the interlocking control module is used for controlling the solid-state switch module to be closed for a preset time when the mechanical switch module starts to be disconnected, and the preset time is greater than or equal to a disconnection time of the mechanical switch module; the mechanical switch module comprises an electromagnetic coil; the switch circuit further comprises a current detection module and a voltage control module, the current detection module is configured to detect a line current of a power supply line, and an input end of the voltage control module is connected with an output end of the current detection module; when the line current is less than a first preset value, the voltage control module provides a first preset voltage to the electromagnetic coil; when the line current is greater than or equal to the first preset value, the voltage control module provides a second preset voltage to the electromagnetic coil; 2. The switching circuit of claim 1, wherein wherein the second preset voltage is greater than the first preset voltage, so as to accelerate the disconnection speed of the mechanical switch module when the line current is greater than or equal to the first preset value. the mechanical switch module comprises an induction coil coupled with the electromagnetic coil; 3. The switching circuit of claim 2, wherein an input end of the interlocking control module is connected with the induction coil, and when the induction coil generates an induction current, the interlocking control module provides a control voltage to the control end of the solid-state switch module. the interlocking control module comprises a rectifier module and a voltage stabilizing module; 4. The switching circuit of claim 3, wherein a first input end and a second input end of the rectifier module are respectively connected with two ends of the induction coil, an output end of the rectifier module is connected with an input end of the voltage stabilizing module, and an output end of the voltage stabilizing module is connected with the control end of the solid-state switch module. the rectifier module comprises a rectifier bridge, and the voltage stabilizing module comprises a first capacitor; a first input end and a second input end of the rectifier bridge are respectively connected with two ends of the induction coil; a first output end of the rectifier bridge is connected with a first polar plate of the first capacitor, and a second output end of the rectifier bridge is connected with a second polar plate of the first capacitor; 5. The switching circuit of claim 1, wherein, the first polar plate of the first capacitor is grounded, and the second polar plate of the first capacitor is connected with the control end of the solid-state switch module. the solid-state switch module comprises a first MOS tube and a second MOS tube; a source of the first MOS tube is connected with a source of the second MOS tube, and gates of the first MOS tube and the second MOS tube are connected with the output end of the interlocking control module; 6. The switching circuit of claim 5, wherein, a drain of the first MOS tube is connected with a power input end of the mechanical switch module, and a drain of the second MOS tube is connected with a power output end of the mechanical switch module. the solid-state switch module further comprises a first resistor; a first end of the first resistor is connected with a first node between the source of the first MOS tube and the source of the second MOS tube, and a second end of the first resistor is connected with the output end of the interlocking control module. The gate of the first MOS transistor and the second MOS transistor is connected with the second end of the first resistor, and the first node is grounded.

7. The switching circuit of claim 1, wherein, The voltage control module comprises a short-circuit judgment module and a voltage input module; The input end of the short-circuit judgment module is connected with the output end of the current detection module, and the input end of the voltage input module is connected with the output end of the short-circuit judgment module; When the line current is greater than or equal to a first preset value, the short-circuit judgment module outputs a control signal, and the voltage input module provides a second preset voltage to the electromagnetic coil according to the control signal.

8. The switching circuit of claim 7, wherein, The voltage input module comprises a first switch, and the short-circuit judgment module comprises a first comparator; One end of the first switch is connected with the second preset voltage, and the other end is connected with the electromagnetic coil; The non-inverting input end of the first comparator is connected with the output end of the current detection module, the inverting input end of the first comparator is connected with a first comparison voltage, and the output end of the first comparator is connected with the control end of the first switch.

9. The switching circuit of claim 8, wherein, The short-circuit judgment module further comprises a second comparator; The non-inverting input end of the second comparator is connected with the output end of the current detection module, the inverting input end of the second comparator is connected with a second comparison voltage, and the output end of the second comparator is connected with the control end of the first switch.

10. The switching circuit of claim 7, wherein, The voltage control module further comprises a signal holding module; The input end of the signal holding module is connected with the output end of the short-circuit judgment module, and the output end of the signal holding module is connected with the input end of the voltage input module; When the line current is greater than or equal to a first preset value, the short-circuit judgment module outputs a first control signal in a first time period, the signal holding module outputs a second control signal in a second time period according to the first control signal, and the second time period is greater than the first time period.

11. The switching circuit of claim 10, wherein, The signal holding module comprises a first OR gate; The first input end and the second input end of the first OR gate are connected with the output end of the short-circuit judgment module, and the output end of the first OR gate is connected with the input end of the voltage input module; The first input end and / or the second input end of the first OR gate are connected with the output end.

12. The switching circuit of claim 2, wherein, The electromagnetic coil comprises a first coil and a second coil; The first coil is configured to control the mechanical switch module to be closed after being powered on, the second coil is configured to control the mechanical switch module to be opened after being powered on, and the induction coil is coupled with the second coil; When the line current is less than the first preset value, the voltage control module provides a first preset voltage to the first coil and the second coil; when the line current is greater than or equal to the first preset value, the voltage control module provides a second preset voltage to the first coil and the second coil.

13. The switching circuit of claim 12, wherein, The switch circuit further comprises a first control switch and a second control switch; The first end of the first coil and the first end of the second coil are connected with the voltage control module; A first end of the first control switch is connected with a second end of the first coil, and a second end of the first control switch is grounded; a first end of the second control switch is connected with a second end of the second coil, and a second end of the second control switch is grounded.

14. The switching circuit of claim 13, wherein, A control end of the second control switch is connected with the voltage control module. When the line current is greater than or equal to a first preset value, the voltage control module provides a second preset voltage to the second coil and controls the second control switch to repeatedly open and close, so that the second coil passes through a pulse current.

15. A relay system characterized by, A switching circuit comprising any one of claims 1 to 14.

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