Discharge circuit and discharge device

Abstract

The embodiment of the utility model provides a discharging circuit and a discharging device. The discharging circuit comprises a power supply, a first switching circuit, a second switching circuit and a third switching circuit. Wherein the power supply is respectively connected with the first end of the first switching circuit and the first end of the third switching circuit, the second end of the first switching circuit is respectively connected with the second end of the third switching circuit and the first end of the second switching circuit, the second end of the third switching circuit is connected with the first end of the second switching circuit, and the second end of the second switching circuit is grounded. The third end of the first switching circuit is grounded. According to the discharge circuit, when the power supply is shut down, the first switch circuit is not conducted, and the second switch circuit and the third switch circuit are conducted to form a constant current source, so that the capacitor is discharged through the constant current source, and the discharge speed of the capacitor is improved.

Description

Technical Field

[0001] This application relates to the field of circuits, and particularly to a discharge circuit and a discharge device. Background Art

[0002] When the power supply of an electronic device is turned off, due to the presence of numerous capacitors in the circuit, discharging the capacitors can effectively improve the safety of the electronic device.

[0003] In the prior art, in order to achieve rapid discharge of capacitors in a circuit, a resistor is usually connected in parallel across the two ends of the capacitor as the minimum load. During the discharge process of the capacitor, the stored electrical energy is released in the form of heat through the resistor.

[0004] However, the discharge speed of capacitors in the prior art is relatively slow. Summary of the Invention

[0005] Embodiments of this application provide a discharge circuit and a discharge device to achieve the technical effect of improving the discharge speed of capacitors.

[0006] In a first aspect, embodiments of this application provide a discharge circuit, including: a power supply, a first switch circuit, a second switch circuit, and a third switch circuit;

[0007] The power supply is respectively connected to the first end of the first switch circuit and the first end of the third switch circuit;

[0008] The second end of the first switch circuit is respectively connected to the second end of the third switch circuit and the first end of the second switch circuit;

[0009] The second end of the third switch circuit is connected to the first end of the second switch circuit;

[0010] The second end of the second switch circuit is grounded;

[0011] The third end of the first switch circuit is grounded;

[0012] When the power supply is turned off, the first switch circuit is not conducting, and the second switch circuit and the third switch circuit are conducting.

[0013] In a possible implementation, the third switch circuit includes: a first resistor and a first triode;

[0014] The first end of the first resistor and the collector terminal of the first triode are respectively connected to the power supply;

[0015] The second end of the first resistor is respectively connected to the second end of the first switch circuit, the first end of the second switch circuit, and the base terminal of the first triode;

[0016] The emitter terminal of the first triode is connected to the first end of the second switching circuit.

[0017] In a possible implementation manner, the first switching circuit includes: a second resistor, a third resistor, and a switching switch;

[0018] The first end of the second resistor is connected to the power supply;

[0019] The second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is grounded;

[0020] The first end of the switching switch is connected between the second end of the second resistor and the first end of the third resistor, and the second end of the switching switch is connected to the base terminal of the triode.

[0021] In a possible implementation manner, the switching switch is a metal-oxide semiconductor field effect transistor or a first operational amplifier.

[0022] In a possible implementation manner, when the switching switch is the metal-oxide semiconductor field effect transistor,

[0023] The gate terminal of the metal-oxide semiconductor field effect transistor is connected between the second end of the second resistor and the first end of the third resistor;

[0024] The drain terminal of the metal-oxide semiconductor field effect transistor is connected to the second end of the first resistor;

[0025] The source terminal of the metal-oxide semiconductor field effect transistor is grounded.

[0026] In a possible implementation manner, when the switching switch is the first operational amplifier,

[0027] The first input terminal of the first operational amplifier is connected between the second end of the second resistor and the first end of the third resistor, and the second input terminal of the first operational amplifier is used to receive a voltage signal;

[0028] The positive power supply port of the first operational amplifier is connected to the first power supply module, and the negative power supply port of the first operational amplifier is grounded;

[0029] The output terminal of the first operational amplifier is connected to the base of the first triode.

[0030] In a possible implementation manner, the second switching circuit includes: a second triode, a fourth resistor, and a fifth resistor;

[0031] The collector of the second triode is connected to the second end of the switching switch;

[0032] The base terminal of the second triode is connected to the first end of the fourth resistor;

[0033] The emitter terminal of the second triode is grounded;

[0034] The second end of the fourth resistor is respectively connected to the emitter terminal of the first triode and the first end of the fifth resistor, and the second end of the fifth resistor is grounded.

[0035] In a possible implementation manner, the second switching circuit is an optocoupler;

[0036] The first input terminal of the optocoupler is connected to the second end of the switching switch;

[0037] The second input terminal of the optocoupler is connected to the emitter terminal of the first triode;

[0038] The first output terminal of the optocoupler and the second output terminal of the optocoupler are respectively grounded.

[0039] In a possible implementation manner, the second switching circuit includes: a second operational amplifier and a sixth resistor;

[0040] The first input terminal of the second operational amplifier is respectively connected to the emitter terminal of the first triode and the first end of the sixth resistor, and the second end of the sixth resistor is grounded;

[0041] The first input terminal of the second operational amplifier is used to receive a voltage signal;

[0042] The positive power supply port of the second operational amplifier is connected to the second power supply module, and the negative power supply port of the second operational amplifier is grounded;

[0043] The output terminal of the second operational amplifier is connected to the second end of the switching switch.

[0044] In a second aspect, an embodiment of the present application provides a discharging device, including a capacitor and the discharging circuit according to any one of the first aspect;

[0045] The capacitor discharges through the discharging circuit.

[0046] A discharge circuit and a discharge device provided by an embodiment of the present application. The discharge circuit includes a power supply, a first switch circuit, a second switch circuit, and a third switch circuit. Among them, the power supply is respectively connected to the first end of the first switch circuit and the first end of the third switch circuit. The second end of the first switch circuit is respectively connected to the second end of the third switch circuit and the first end of the second switch circuit. The second end of the third switch circuit is connected to the first end of the second switch circuit. The second end of the second switch circuit is grounded, and the third end of the first switch circuit is grounded. When the power supply of the discharge circuit of the present application is turned off, the first switch circuit is not turned on, and the second switch circuit and the third switch circuit are turned on to form a constant current source, so that the capacitor discharges through the constant current source, improving the discharge speed of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0048] Figure 1 A schematic diagram of a scenario including a discharge circuit provided by an embodiment of the present application;

[0049] Figure 2A A schematic diagram of a process when the power supply is turned on provided by an embodiment of the present application;

[0050] Figure 2B A schematic diagram of a process when the power supply is turned off provided by an embodiment of the present application;

[0051] Figure 3 A schematic diagram of the structure of a discharge circuit provided by an embodiment of the present application;

[0052] Figure 4 A schematic diagram of the structure of a first switch circuit provided by an embodiment of the present application;

[0053] Figure 5 A schematic diagram of the structure of a first switch circuit provided by an embodiment of the present application;

[0054] Figure 6 Another schematic diagram of the structure of a first switch circuit provided by an embodiment of the present application;

[0055] Figure 7 A schematic diagram of the structure of a second switch circuit provided by an embodiment of the present application;

[0056] Figure 8 Another schematic diagram of the structure of a second switch circuit provided by an embodiment of the present application;

[0057] Figure 9 Another schematic diagram of the structure of a second switch circuit provided by an embodiment of the present application;

[0058] Figure 10 This is a schematic structural diagram of another discharge circuit provided by an embodiment of the present application.

[0059] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and more detailed descriptions will be provided hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0060] Here, exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0061] In the description of the embodiments of the present application, terms such as "inner", "outer", "first", and "second" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0062] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0063] In the power supply system of an electronic device, after the power supply is turned off, since there are many capacitors connected to the output terminal of the power supply in the circuit, such as large capacitive loads, etc., discharging the capacitors can improve the safety, stability, and reliability of the power supply system.

[0064] After the power supply is turned off, since the output voltage of the capacitor drops very slowly, in order to increase the discharge speed of the capacitor, currently, usually a suitable discharge resistor is connected across the capacitor to accelerate the discharge process of the capacitor by adding a discharge resistor.

[0065] However, currently, the above-mentioned method of increasing resistance causes a certain degree of loss of power resources when the power supply is turned on, and the discharge speed of the resistor decreases as the voltage of the capacitor decreases, resulting in a still slow discharge speed of the capacitor.

[0066] Moreover, since the discharge speed of the capacitor is too slow, when the power supply is restarted, as the capacitor has not been fully discharged and still has charge, these charges overlap with the power supply voltage, easily leading to momentary voltage overshoot.

[0067] Since the discharge speed of the capacitor is too slow, when a hot plug operation is performed on the power supply system, as the capacitor does not have enough time to be fully discharged, there may be a certain residual voltage on the capacitor. These residual voltages may cause the electronic device to be in an uncertain state when powered on again, resulting in incorrect reset and further leading to fault locking.

[0068] Therefore, in view of the technical problem of the slow discharge speed of the capacitor in the prior art, the inventor found in the research process that by setting up a discharge circuit, the discharge circuit includes a power supply, a first switch circuit, a second switch circuit, and a third switch circuit. When the power supply is turned off, since the first switch circuit does not reach the conduction voltage threshold, the first switch circuit is not conducting, and since the second switch circuit and the third switch circuit reach the conduction voltage threshold, the second switch circuit and the third switch circuit are conducting to form a constant current source, so that the capacitor discharges through this constant current source to improve the discharge speed of the capacitor. Based on this, the present application proposes a discharge circuit and a discharge device.

[0069] To facilitate the understanding of the present application, Figure 1 FIG. is a schematic diagram of a scenario including a discharge circuit provided by an embodiment of the present application. As Figure 1 shown, it includes a power supply 11, an output capacitor 12, a load 13, and a discharge circuit, i.e., a constant current source 14.

[0070] After the power supply 11 is turned on and operates normally, when the output voltage reaches the normal value, the load 13 starts to operate, and the discharge circuit 14 detects that the output voltage is higher than a preset voltage threshold. At this time, the discharge circuit 14 is turned off. As Figure 2A shown, Figure 2A FIG. is a schematic diagram of a process when the power supply of the present application is turned on. Since the current does not flow through the discharge circuit 14, and thus does not flow through other small loads 15 related to the discharge circuit, the loss of power resources is reduced.

[0071] When the power supply 11 is turned off, the output voltage drops to a preset voltage threshold in advance, the load 13 stops operating and no longer consumes current. The discharge circuit 14 detects that the output voltage is lower than the preset voltage threshold. At this time, the discharge circuit 14 is turned on, and other small loads 15 related to the discharge circuit are turned on, so that the output capacitor 12 discharges through the discharge circuit 14. AsFigure 2B As shown Figure 2B This is a schematic flowchart of the power-off process provided by the embodiment of the present application. Discharging is performed through a discharge circuit, which improves the discharge speed of the capacitor.

[0072] The following will specifically describe the technical solution of the present application and how the technical solution of the present application solves the above technical problems in detail. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0073] Figure 3 This is a schematic structural diagram of a discharge circuit provided by the embodiment of the present application. As Figure 3 shown, the circuit includes: a power supply 31, a first switch circuit 32, a second switch circuit 33, and a third switch circuit 34.

[0074] The connection relationship is as follows:

[0075] The power supply 31 is respectively connected to the first end of the first switch circuit 32 and the first end of the third switch circuit 34.

[0076] The second end of the first switch circuit 32 is respectively connected to the second end of the third switch circuit 34 and the first end of the second switch circuit 33.

[0077] The second end of the third switch circuit 34 is connected to the first end of the second switch circuit 33.

[0078] The second end of the second switch circuit 33 is grounded.

[0079] The third end of the first switch circuit 32 is grounded.

[0080] In this embodiment, the third switch circuit 34 may include: a first resistor 341 and a first triode 342.

[0081] Among them, the first end of the first resistor 341 and the collector terminal of the first triode 342 are respectively connected to the power supply 31, the second end of the first resistor 341 is respectively connected to the second end of the first switch circuit 32, the first end of the second switch circuit 33, and the base terminal of the first triode 342, and the emitter terminal of the first triode 342 is connected to the first end of the second switch circuit 33.

[0082] When the power supply 31 is shut down, the output voltage of the power supply 31 decreases, and the decreased voltage cannot reach the conduction voltage of the first switching circuit 32. Therefore, the first switching circuit 32 is not conducted. The non - conduction of the first switching circuit 32 causes the voltage of the third switching circuit 34 to reach the conduction voltage. Therefore, the third switching circuit 34 is conducted. Since the conduction of the third circuit causes the voltage of the second switching circuit 33 to reach the conduction voltage, the second switching circuit 33 is conducted, forming a constant current source to enable the capacitor to discharge through this constant current source.

[0083] In the above - mentioned embodiment of the present application, when the power supply of the discharge circuit is shut down, the first switching circuit cannot reach the conduction voltage threshold, the first switching circuit is not conducted, and the second switching circuit and the third switching circuit reach the conduction voltage threshold and are conducted to form a constant current source, so that the capacitor discharges through this constant current source, improving the discharge speed of the capacitor.

[0084] Further, on the basis of the above - mentioned embodiment, the structural composition of the first switching circuit is described through the following embodiment. As Figure 4 shown, Figure 4 FIG. is a schematic structural diagram of a first switching circuit provided by an embodiment of the present application, which may include: a second resistor 401, a third resistor 402, and a switching switch 403.

[0085] The connection relationship is as follows:

[0086] The first end of the second resistor 401 is connected to the power supply 31, the second end of the second resistor 401 is connected to the first end of the third resistor 402, the second end of the third resistor 402 is grounded, the first end of the switching switch 403 is connected between the second end of the second resistor 401 and the first end of the third resistor 402, and the second end of the switching switch 403 is connected to the base terminal of the first triode.

[0087] Among them, the switching switch 403 is a Metal - Oxide - Semiconductor Field Effect Transistor (MOS) or a first operational amplifier.

[0088] A possible implementation manner is:

[0089] When the switching switch 403 is a Metal - Oxide - Semiconductor Field Effect Transistor MOS, the structure of the first switching circuit can be as Figure 5 shown:

[0090] Figure 5 FIG. is a schematic structural diagram of a first switching circuit provided by an embodiment of the present application. As Figure 4As shown, the first switch circuit 50 includes: a second resistor 501, a third resistor 502, and a metal-oxide-semiconductor field-effect transistor 503.

[0091] Their connection relationship is as follows:

[0092] The gate terminal of the metal-oxide-semiconductor field-effect transistor 503 is connected between the second terminal of the second resistor 501 and the first terminal of the third resistor 502, and the first terminal of the second resistor 501 is connected to the power supply 31.

[0093] The drain terminal of the metal-oxide-semiconductor field-effect transistor 503 is connected to the second terminal of the first resistor 341.

[0094] The source terminal of the metal-oxide-semiconductor field-effect transistor 503 is grounded.

[0095] Another possible implementation is:

[0096] When the switching switch 403 is the first operational amplifier, the structure of the second switch circuit can also be as Figure 6 shown:

[0097] Figure 6 This is a schematic diagram of the structure of another first switch circuit provided by the embodiment of the present application. As Figure 6 shown, the first switch circuit 60 includes: a second resistor 601, a third resistor 602, and a first operational amplifier 603.

[0098] Their connection relationship is as follows:

[0099] The first input terminal of the first operational amplifier 603 is connected between the second terminal of the second resistor 601 and the first terminal of the third resistor 602, and the second input terminal of the first operational amplifier 603 is used to receive a voltage signal.

[0100] The positive power supply port of the first operational amplifier 603 is connected to the first power supply module, and the negative power supply port of the first operational amplifier 603 is grounded.

[0101] The output terminal of the first operational amplifier 603 is connected to the base terminal of the first triode 342.

[0102] In the above-mentioned embodiment of the present application, the first switch circuit may include a second resistor, a third resistor, and a switching switch, where the switching switch is a metal-oxide-semiconductor field-effect transistor or a first operational amplifier. In the first switch circuit of this embodiment, when the power supply is turned off, the output voltage drops, and the switching switch cannot reach the conduction voltage, so the first switch does not conduct.

[0103] Furthermore, on the basis of the above-mentioned embodiment, through the following Figures 7 - 9The embodiments illustrate the structural composition of the second switching circuit.

[0104] Figure 7 FIG. is a schematic structural diagram of a second switching circuit provided by an embodiment of the present application. As Figure 7 shown, the second switching circuit 70 includes: a second triode 701, a fourth resistor 702, and a fifth resistor 703.

[0105] The connection relationship is as follows:

[0106] The collector of the second triode 701 is connected to the second end of the switching switch 403.

[0107] The base terminal of the second triode 701 is connected to the first end of the fourth resistor 702.

[0108] The emitter terminal of the second triode 701 is grounded.

[0109] The second end of the fourth resistor 702 is respectively connected to the emitter terminal of the first triode 342 and the first end of the fifth resistor 703, and the second end of the fifth resistor 703 is grounded.

[0110] When the voltage received by the base terminal of the second triode 701 reaches the conduction voltage, the second triode 701 conducts.

[0111] Figure 8 FIG. is a schematic structural diagram of another second switching circuit provided by an embodiment of the present application. As Figure 8 shown, the second switching circuit 80 is an optocoupler 801.

[0112] The first input terminal of the optocoupler 801 is connected to the second end of the switching switch 403.

[0113] The second input terminal of the optocoupler 801 is connected to the emitter terminal of the first triode 342.

[0114] The first output terminal of the optocoupler 801 and the second output terminal of the optocoupler 802 are respectively grounded.

[0115] Figure 9 FIG. is a schematic structural diagram of yet another second switching circuit provided by an embodiment of the present application. As Figure 9 shown, the second switching circuit 90 includes: a second operational amplifier 901 and a sixth resistor 902.

[0116] The connection relationship is as follows:

[0117] The first input terminal of the second operational amplifier 901 is respectively connected to the emitter terminal of the first triode and the first end of the sixth resistor 902, and the second end of the sixth resistor 902 is grounded.

[0118] The first input terminal of the second operational amplifier 901 is used to receive a voltage signal.

[0119] The positive power supply port of the second operational amplifier 901 is connected to the second power supply module, and the negative power supply port of the second operational amplifier 901 is grounded.

[0120] The output terminal of the second operational amplifier 901 is connected to the second terminal of the switching switch.

[0121] In the above embodiments of the present application, the second switching circuit is composed of a second triode, a fourth resistor, and a fifth resistor, and may be an optocoupler, or may also be composed of a second operational amplifier and a sixth resistor. In the second switching circuit of this embodiment, when the power supply is turned off, the output voltage drops, the first switch is not turned on, resulting in the second switching circuit reaching the conduction voltage, causing the second switching circuit to conduct.

[0122] The present application also includes a discharge device, which includes a capacitor and any one of the discharge circuits in the above embodiments, and the capacitor discharges through this discharge circuit.

[0123] Furthermore, for the convenience of understanding the discharge circuit of the present application, in the following embodiments, the third switching circuit is composed of a first resistor and a first triode, the first switching circuit is composed of a second resistor, a third resistor, and a metal-oxide semiconductor field effect transistor, and the second switching circuit is composed of a second triode, a fourth resistor, and a fifth resistor as an example for a detailed description.

[0124] Figure 10 For another structural schematic diagram of the discharge circuit provided by the embodiments of the present application, as Figure 10 shown, this structure includes: a power supply 01, a third switching circuit 02, a first switching circuit 03, and a second switching circuit 04.

[0125] Among them, the third switching circuit 02 includes a first resistor 021 and a first triode 022, the first switching circuit 03 includes a second resistor 031, a third resistor 032, and a metal-oxide semiconductor field effect transistor 033, and the second switching circuit 04 includes a second triode 041, a fourth resistor 042, and a fifth resistor 043.

[0126] The connection relationship is as follows:

[0127] The first end of the first resistor 021, the first end of the second resistor 031, and the collector terminal of the first triode 022 are respectively connected to the power supply 01. The second end of the first resistor 021 is respectively connected to the drain terminal of the metal-oxide semiconductor field effect transistor 033 and the base terminal of the first triode 022. The emitter terminal of the first triode 022 is connected to the second end of the fourth resistor 042.

[0128] The second terminal of the second resistor 031 is connected to the first terminal of the third resistor 032. The second terminal of the third resistor 032 is grounded. The gate terminal of the metal-oxide-semiconductor field-effect transistor 033 is connected between the second terminal of the second resistor 031 and the first terminal of the third resistor 032. The drain terminal of the metal-oxide-semiconductor field-effect transistor 033 is connected to the second terminal of the first resistor 021. The source terminal of the metal-oxide-semiconductor field-effect transistor 033 is grounded.

[0129] The collector of the second triode 041 is connected to the drain terminal of the metal-oxide-semiconductor field-effect transistor 033. The base terminal of the second triode 041 is connected to the first terminal of the fourth resistor 042. The emitter terminal of the second triode 041 is grounded. The second terminal of the fourth resistor 042 is respectively connected to the emitter terminal of the first triode 022 and the first terminal of the fifth resistor 043. The second terminal of the fifth resistor 043 is grounded.

[0130] Its discharge working principle is as follows:

[0131] To facilitate the understanding of the working principle of the discharge circuit when the power supply 01 is turned off, first, an example is given to illustrate the working process of the discharge circuit when the power supply 01 is turned on.

[0132] When the power supply 01 is turned on, assume that the output voltage of the power supply 01 is relatively high, assumed to be 12V. The preset turn-on voltage threshold Vgs-th of the gate terminal of the metal-oxide-semiconductor field-effect transistor 033 is assumed to be 10.8V. The voltage received by the gate terminal of the metal-oxide-semiconductor field-effect transistor 033 is higher than its turn-on voltage threshold Vgs-th, and the metal-oxide-semiconductor field-effect transistor 033 conducts. Due to its conduction, the voltage Q1a at the base terminal of the first triode 022 decreases, and further the voltage Q1b at the emitter terminal of the first triode 022 decreases. The decrease in Q1b causes the voltage received by the base terminal of the second triode 041 to be lower than its preset turn-on voltage threshold. Therefore, the first triode 022 and the second triode 041 do not conduct, and the entire discharge circuit does not work.

[0133] Since the discharge circuit does not work when the power supply 01 is turned on, compared with the prior art, it reduces the power resource loss of the system.

[0134] When the power supply 01 is shut down, due to the drop in the output voltage, the voltage received at the gate terminal of the metal-oxide-semiconductor field-effect transistor 033 is lower than its turn-on voltage threshold Vgs-th, and the metal-oxide-semiconductor field-effect transistor 033 turns off. Due to its turn-off, the voltage Q1a at the base terminal of the first triode 022 increases and reaches the preset turn-on voltage threshold at the base terminal of the first triode 022. Therefore, the first triode 022 conducts. Due to its conduction, current flows through the fifth resistor 043, and the voltage Vr1 of the fifth resistor 043 rises. Although due to the presence of the fourth resistor 042, the voltage received at the base terminal of the second triode 041 is slightly smaller than Vr1, it still reaches the preset turn-on voltage threshold at the base terminal of the second triode 041. Therefore, the second triode 041 conducts. Since the second triode 041 conducts, the voltage Q1a at the base terminal of the first triode 022 decreases, and then the voltage Q1b at the emitter terminal of the first triode 022 decreases, resulting in a decrease in the current Ib flowing through Q1b and a decrease in the current at the emitter terminal of the first triode 022. Due to the decrease in the current at the emitter terminal of the first triode 022, the voltage Vr1 of the fifth resistor 043 decreases, thus forming negative feedback, making the current passing through the fifth resistor 043 constant, forming a constant current source, and then enabling the capacitor to discharge through the formed constant current source.

[0135] It can be understood that in this application, the switching switch in the first switching circuit of the discharge circuit is an operational amplifier, and the second switching circuit is an optocoupler, or an operational amplifier and a fifth resistor. The principle of the discharge circuit is similar to that of this embodiment. To avoid redundancy, it will not be repeated here.

[0136] In the above embodiment of this application, the discharge circuit forms a constant current source, enabling the capacitor to discharge through the formed constant current source, which improves the discharge speed of the capacitor.

[0137] Finally, it should be noted that: After considering the specification and practicing the invention disclosed here, those skilled in the art will easily think of other implementation schemes of the present invention. The present invention aims to cover any variations, uses, or adaptive changes of the present invention. These variations, uses, or adaptive changes follow the general principles of the present invention and include common general knowledge or conventional technical means in the technical field not disclosed in the present invention. It is not limited to the precise structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A discharge circuit, characterized in that, Comprising: A power supply, a first switch circuit, a second switch circuit, and a third switch circuit; The power supply is respectively connected to the first end of the first switch circuit and the first end of the third switch circuit; The second end of the first switch circuit is respectively connected to the second end of the third switch circuit and the first end of the second switch circuit; The second end of the third switch circuit is connected to the first end of the second switch circuit; The second end of the second switch circuit is grounded; The third end of the first switch circuit is grounded; When the power supply is turned off, the first switch circuit is not conducting, and the second switch circuit and the third switch circuit are conducting.

2. The discharge circuit according to claim 1, wherein The third switch circuit includes: a first resistor and a first triode; The first end of the first resistor and the collector terminal of the first triode are respectively connected to the power supply; The second end of the first resistor is respectively connected to the second end of the first switch circuit, the first end of the second switch circuit, and the base terminal of the first triode; The emitter terminal of the first triode is connected to the first end of the second switch circuit.

3. The discharge circuit according to claim 2, wherein The first switch circuit includes: a second resistor, a third resistor, and a switching switch; The first end of the second resistor is connected to the power supply; The second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is grounded; The first end of the switching switch is connected between the second end of the second resistor and the first end of the third resistor, and the second end of the switching switch is connected to the base extreme of the first triode.

4. The discharge circuit according to claim 3, characterized in that, The switching switch is a metal-oxide-semiconductor field-effect transistor or a first operational amplifier.

5. The discharge circuit according to claim 4, characterized in that, When the switching switch is the metal-oxide-semiconductor field-effect transistor, The gate extreme of the metal-oxide-semiconductor field-effect transistor is connected between the second end of the second resistor and the first end of the third resistor; The drain extreme of the metal-oxide-semiconductor field-effect transistor is connected to the second end of the first resistor; The source extreme of the metal-oxide-semiconductor field-effect transistor is grounded.

6. The discharge circuit according to claim 4, wherein When the switching switch is the first operational amplifier, The first input terminal of the first operational amplifier is connected between the second end of the second resistor and the first end of the third resistor, and the second input terminal of the first operational amplifier is used to receive a voltage signal; The positive power supply port of the first operational amplifier is connected to a first power supply module, and the negative power supply port of the first operational amplifier is grounded; The output terminal of the first operational amplifier is connected to the base terminal of the first triode.

7. The discharge circuit according to claim 3, wherein The second switch circuit includes: a second triode, a fourth resistor, and a fifth resistor; The collector of the second triode is connected to the second end of the switching switch; The base terminal of the second triode is connected to the first end of the fourth resistor; The emitter terminal of the second triode is grounded; The second end of the fourth resistor is respectively connected to the emitter terminal of the first triode and the first end of the fifth resistor, and the second end of the fifth resistor is grounded.

8. The discharge circuit according to claim 3, characterized in that The second switch circuit is an optocoupler; The first input terminal of the optocoupler is connected to the second end of the switching switch; The second input terminal of the optocoupler is connected to the emitter terminal of the first triode; The first output terminal and the second output terminal of the optocoupler are respectively grounded.

9. The discharge circuit according to claim 3, wherein The second switching circuit includes: a second operational amplifier and a sixth resistor; The first input terminal of the second operational amplifier is respectively connected to the emitter terminal of the first triode and the first end of the sixth resistor, and the second end of the sixth resistor is grounded; The first input terminal of the second operational amplifier is used to receive a voltage signal; The positive power supply port of the second operational amplifier is connected to the second power supply module, and the negative power supply port of the second operational amplifier is grounded; The output terminal of the second operational amplifier is connected to the second end of the switching switch.

10. A discharge device, characterized in that, Comprising a capacitor and a discharge circuit according to any one of claims 1-9; The capacitor is discharged through the discharge circuit.

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