Electronic device and voltage bleeder circuit

Abstract

The invention discloses an electronic device and a voltage leakage circuit, the electronic device comprises a control circuit and a power circuit, the control circuit is connected with the power circuit and is used for controlling the power circuit to perform leakage or stop leakage, and the control circuit comprises a voltage division circuit; the comparison circuit is connected with the voltage division circuit and is used for receiving the first voltage from the voltage division circuit and comparing the first voltage with a preset reference voltage; the driving circuit receives the first reference voltage, is connected with the comparison circuit and the power circuit, and is used for outputting the first reference voltage to the power circuit when the first voltage is greater than or equal to the reference voltage so as to control the power circuit to discharge; one end of the hysteresis circuit is connected with the power circuit, the other end of the hysteresis circuit is connected between the voltage division circuit and the comparison circuit, and the hysteresis circuit is used for increasing the first voltage when the driving circuit outputs the first reference voltage to the power circuit. The power circuit is controlled through the voltage division circuit, the comparison circuit and the driving circuit, the cost can be reduced, and the occupied space is small.

Description

Technical Field

[0001] This application relates to the field of voltage discharge technology, and in particular to an electronic device and voltage discharge circuit. Background Technology

[0002] Currently, electronic devices are being damaged due to overvoltage stress. For example, when the motor of an electronic device brakes, the energy fed back by the motor causes overvoltage on the busbar, or fluctuations in the power grid to which the electronic device is connected cause overvoltage on the busbar, or the electronic device is damaged by lightning strikes, causing overvoltage on the busbar.

[0003] Existing pressure relief circuits are controlled by MCU (Microcontroller Unit) chips, but MCU chips are expensive. Summary of the Invention

[0004] This application mainly provides an electronic device and a voltage discharge circuit to solve the problem of high cost.

[0005] This application provides a voltage discharge circuit, including a control circuit and a power circuit. The control circuit is connected to the power circuit and is used to control the power circuit to discharge or stop discharging. The control circuit includes:

[0006] Voltage divider circuit, connected to the busbar;

[0007] A comparator circuit, connected to the voltage divider circuit, is used to receive a first voltage from the voltage divider circuit and compare the first voltage with a preset reference voltage.

[0008] A driving circuit receives a first reference voltage, is connected to the comparison circuit, and is connected to the power circuit. The driving circuit is used to output the first reference voltage to the power circuit when the first voltage is greater than or equal to the reference voltage, so as to control the power circuit to discharge.

[0009] A hysteresis circuit, one end of which is connected to the power circuit, and the other end of which is connected between the voltage divider circuit and the comparator circuit, is used to increase the first voltage when the drive circuit outputs the first reference voltage to the power circuit.

[0010] The voltage divider circuit includes a first resistor and a second resistor. One end of the first resistor is connected to the bus, and the other end of the first resistor is grounded through the second resistor.

[0011] The comparison circuit includes an adjustable voltage regulator, with a first terminal grounded, a second terminal connected between the first resistor and the second resistor, and a third terminal connected to the drive circuit.

[0012] The driving circuit includes a third resistor, a fourth resistor, a first capacitor, a first switching transistor, a fifth resistor, and a sixth resistor. The third terminal of the adjustable voltage regulator receives the first reference voltage through the third resistor and the fourth resistor in sequence. The first capacitor is connected in parallel with the fourth resistor. The first terminal of the first switching transistor is connected to one end of the fourth resistor and receives the first reference voltage. The second terminal of the first switching transistor is connected to the power circuit through the fifth resistor. The third terminal of the first switching transistor is connected to the other end of the fourth resistor. The second terminal of the first switching transistor is grounded through the fifth resistor and the sixth resistor.

[0013] Wherein, the second terminal of the adjustable voltage regulator receives the first voltage, and the third terminal of the adjustable voltage regulator is used to reduce the output second voltage when the first voltage is greater than or equal to the reference voltage, the first switch is turned on, and the first reference voltage is output to the power circuit to control the power circuit to discharge.

[0014] Wherein, the second terminal of the adjustable voltage regulator receives the first voltage, the third terminal of the adjustable voltage regulator is used to output a second voltage when the first voltage is less than the reference voltage, the first switching transistor is turned off, and the voltage at the control terminal of the power circuit is released through the sixth resistor to control the power circuit to stop discharging.

[0015] The hysteresis circuit includes a seventh resistor and a first diode. The positive terminal of the first diode is connected between the fifth and sixth resistors, and the negative terminal of the first diode is connected to the second terminal of the adjustable voltage regulator through the seventh resistor.

[0016] The hysteresis circuit further includes a Zener diode and an eighth resistor. The positive terminal of the first diode is connected between the fifth and sixth resistors through the eighth resistor. The positive terminal of the Zener diode is grounded, and the negative terminal of the Zener diode is connected between the eighth resistor and the first diode.

[0017] The hysteresis circuit further includes a shutdown circuit, which includes a ninth resistor, a tenth resistor, a Zener diode, and a second switching transistor. The first terminal of the second switching transistor is connected to the positive terminal of the first diode through the ninth resistor, the second terminal of the second switching transistor is grounded, the third terminal of the second switching transistor is connected to the third terminal of the adjustable voltage regulator through the Zener diode, one end of the tenth resistor is connected to the third terminal of the second switching transistor, and the other end of the tenth resistor is grounded.

[0018] The third terminal of the adjustable voltage regulator is used to output a second voltage when the first voltage is less than the reference voltage. When the second voltage is greater than the voltage threshold of the Zener diode, the third terminal of the adjustable voltage regulator is connected to the third terminal of the second switching transistor, the second switching transistor is turned on, and the voltage of the control terminal of the power circuit is released through the ninth resistor and the second switching transistor to control the power circuit to quickly stop discharging.

[0019] This application also provides an electronic device including the voltage discharge circuit described above.

[0020] The beneficial effects of this application are as follows: The voltage discharge circuit of this application includes a control circuit and a power circuit. The control circuit is connected to the power circuit and is used to control the power circuit to discharge or stop discharging. The control circuit includes: a voltage divider circuit connected to the bus; a comparator circuit connected to the voltage divider circuit and used to receive a first voltage from the voltage divider circuit and compare the first voltage with a preset reference voltage; a drive circuit that receives a first reference voltage, is connected to the comparator circuit, and is connected to the power circuit. The drive circuit is used to output a first reference voltage to the power circuit when the first voltage is greater than or equal to the reference voltage, so as to control the power circuit to discharge; and a hysteresis circuit, one end of which is connected to the power circuit, and the other end of which is connected between the voltage divider circuit and the comparator circuit. The hysteresis circuit is used to increase the first voltage when the drive circuit outputs the first reference voltage to the power circuit. By realizing the control of the power circuit through the voltage divider circuit, the comparator circuit, and the drive circuit, the cost can be reduced and the space occupied can be reduced compared with the MCU chip of the prior art. In addition, increasing the first voltage when the drive circuit outputs the first reference voltage to the power circuit can avoid the power circuit from frequently discharging or stopping discharging. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0022] Figure 1This is a circuit diagram of the first embodiment of the voltage discharge circuit provided in this application;

[0023] Figure 2 This is a circuit diagram of a second embodiment of the voltage discharge circuit provided in this application;

[0024] Figure 3 This is a circuit diagram of the third embodiment of the voltage discharge circuit provided in this application. Detailed Implementation

[0025] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0027] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0030] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a connection between two components or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0032] This application provides a voltage discharge circuit; please refer to [link / reference]. Figure 1 As shown, Figure 1 This is a circuit diagram of a first embodiment of the voltage discharge circuit provided in this application. The voltage discharge circuit 100 of this embodiment includes a control circuit 10 and a power circuit 20, which can be referred to as a braking circuit.

[0033] In some embodiments, the voltage discharge circuit 100 of this embodiment is applied to an electronic device, which may include a motor. When the motor brakes, it causes an overvoltage on the bus 30, and the bus 30 is discharged through the power circuit 20.

[0034] The power circuit 20 includes a third switch Q3, an eleventh resistor R11, and a second diode D2. The first terminal of the third switch Q3 is connected to the bus 30 through the eleventh resistor R11, the second terminal of the third switch Q3 is grounded, and the third terminal of the third switch Q3 is connected to the control circuit 10. The anode of the second diode D2 is connected to the first terminal of the third switch Q3, and the cathode of the second diode D2 is connected to the bus 30.

[0035] In this embodiment, the third switch Q3 is an N-type MOSFET. The first terminal of Q3 is its source, the second terminal is its drain, and the third terminal is its gate. This third terminal also serves as the control terminal for the power circuit 20. In other embodiments, Q3 can be other types of switches, which will not be elaborated upon here.

[0036] Control circuit 10 controls power circuit 20 to discharge or stop discharging. When control circuit 10 controls the third switch Q3 to turn on, bus 30 is grounded through eleventh resistor R11 and the third switch Q3 to discharge the voltage of bus 30, and power circuit 20 discharges at this time. When control circuit 10 controls the third switch Q3 to turn off, bus 30 and eleventh resistor R11 are disconnected from the third switch Q3, and power circuit 20 stops discharging.

[0037] The control circuit 10 includes a voltage divider circuit 11, a comparator circuit 12, a drive circuit 13, and a hysteresis circuit 14. The voltage divider circuit 11 is connected to the bus 30, that is, one end of the voltage divider circuit 11 is connected to the bus 30, and the other end of the voltage divider circuit 11 is grounded.

[0038] The comparator circuit 12 is connected to the voltage divider circuit 11. The comparator circuit 12 is used to receive a first voltage from the voltage divider circuit 11 and compare the first voltage with a preset reference voltage.

[0039] The drive circuit 13 receives the first reference voltage VCC. The drive circuit 13 is connected to the comparator circuit 12 and the power circuit 20. That is, the drive circuit 13 is connected to the third terminal of the third switch Q3 to control the third switch Q3 to be turned on or off.

[0040] The drive circuit 13 is used to output a first reference voltage VCC to the power circuit when the first voltage is greater than or equal to the reference voltage, thereby controlling the power circuit 20 to discharge. For example, when the first voltage is greater than or equal to the reference voltage, the drive circuit 13 outputs the first reference voltage VCC to the third terminal of the third switch Q3, turning on the third switch Q3 to discharge the voltage of the bus 30, thereby controlling the power circuit 20 to discharge. When the first voltage is less than the reference voltage, the drive circuit 13 releases the voltage at the third terminal of the third switch Q3, turning off the third switch Q3 to control the power circuit 20 to stop discharging.

[0041] One end of the hysteresis circuit 14 is connected to the power circuit 20, that is, the third terminal of the third switch Q3 is connected to one end of the hysteresis circuit 14. The other end of the hysteresis circuit 14 is connected between the voltage divider circuit 11 and the comparator circuit 12. The hysteresis circuit 14 is used to increase the first voltage when the drive circuit 13 outputs the first reference voltage VCC to the power circuit 20; that is, when the drive circuit 13 outputs the first reference voltage VCC to the power circuit 20, the third terminal of the third switch Q3 inputs current to the comparator circuit 12 through the hysteresis circuit 14 to increase the first voltage, which can avoid the third switch Q3 from repeatedly and frequently operating (i.e., turning on or off).

[0042] The voltage discharge circuit 100 of this embodiment includes a control circuit 10 and a power circuit 20. The control circuit 10 is connected to the power circuit 20 and is used to control the power circuit 20 to discharge or stop discharging. The control circuit 10 includes: a voltage divider circuit 11 connected to the bus 30; a comparator circuit 12 connected to the voltage divider circuit 11 and used to receive a first voltage from the voltage divider circuit 11 and compare the first voltage with a preset reference voltage; a drive circuit 13 receiving a first reference voltage, connected to the comparator circuit 12, and connected to the power circuit 20. The drive circuit 13 is used to output a first reference voltage to the power circuit 20 when the first voltage is greater than or equal to the reference voltage, so as to control the power circuit 20 to discharge; and a hysteresis circuit 14, one end of which is connected to the power circuit 20, and the other end of which is connected between the voltage divider circuit 11 and the comparator circuit 12. The hysteresis circuit 14 is used to increase the first voltage when the drive circuit 13 outputs the first reference voltage VCC to the power circuit 20. The power circuit 20 is controlled by a voltage divider circuit 11, a comparator circuit 12, and a driver circuit 13. Compared with existing MCU chips, this reduces costs and occupies less space. Furthermore, the hysteresis circuit 14 increases the first voltage when the driver circuit 13 outputs the first reference voltage VCC to the power circuit 20, preventing the power circuit 20 from frequently discharging or stopping discharging, thus improving reliability.

[0043] According to some embodiments of this application, please refer to Figure 1 As shown, the voltage divider circuit 11 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to the bus 30, and the other end of the first resistor R1 is grounded through the second resistor R2. The first resistor R1 and the second resistor R2 are used to divide the voltage of the bus 30.

[0044] The comparator circuit 12 includes an adjustable voltage regulator U1. The first terminal of the adjustable voltage regulator U1 is grounded, and the second terminal of the adjustable voltage regulator U1 is connected between the first resistor R1 and the second resistor R2 to obtain a first voltage from the voltage divider circuit 11. The third terminal of the adjustable voltage regulator U1 is connected to the drive circuit 13.

[0045] The adjustable voltage regulator U1 has a preset reference voltage, and compares the first voltage with the reference voltage. The third terminal of the adjustable voltage regulator U1 outputs a second voltage. When the first voltage is greater than or equal to the reference voltage, the second voltage output by the adjustable voltage regulator U1 decreases; when the first voltage is less than the reference voltage, the second voltage output by the adjustable voltage regulator U1 increases, so that the second voltage is closer to the first reference voltage VCC.

[0046] The comparison circuit 12 in this embodiment includes an adjustable voltage regulator U1. The first terminal of the adjustable voltage regulator U1 is grounded, and the second terminal of the adjustable voltage regulator U1 is connected between a first resistor R1 and a second resistor R2 to obtain a first voltage from the voltage divider circuit 11. The third terminal of the adjustable voltage regulator U1 is connected to the drive circuit 13. Comparison can be achieved through the adjustable voltage regulator U1, and the second voltage output by the adjustable voltage regulator U1 can be controlled based on the comparison result. This is easy to implement and reduces costs. Furthermore, the voltage divider circuit 11 in this embodiment includes a first resistor R1 and a second resistor R2. By dividing the voltage using the first resistor R1 and the second resistor R2, the accuracy of the first voltage can be improved.

[0047] According to some embodiments of this application, please refer to Figure 1 As shown, the driving circuit 13 in this embodiment includes a third resistor R3, a fourth resistor R4, a first capacitor C1, a first switch Q1, a fifth resistor R5, and a sixth resistor R6.

[0048] The third terminal of the adjustable voltage regulator U1 receives the first reference voltage VCC through the third resistor R3 and the fourth resistor R4 in sequence. The first capacitor C1 is connected in parallel with the fourth resistor R4. One end of the first switch Q1 is connected to one end of the fourth resistor R4. The second end of the first switch Q1 is connected to the power circuit 20 through the fifth resistor R5. The third end of the first switch Q1 is connected to the other end of the fourth resistor R4. The second end of the first switch Q1 is grounded through the fifth resistor R5 and the sixth resistor R6.

[0049] In some embodiments, the first switching transistor Q1 can be a PNP transistor, with its first terminal being the emitter, its second terminal being the collector, and its third terminal being the base. In other embodiments, the first switching transistor Q1 can be other types of switching transistors, which will not be described further here.

[0050] The third terminal of the third switch Q3 is connected between the fifth resistor R5 and the sixth resistor R6. That is, the third terminal of the third switch Q3 is connected to the second terminal of the first switch Q1 through the fifth resistor R5, and the third terminal of the third switch Q3 is grounded through the sixth resistor R6.

[0051] The first and third terminals of the first switch Q1 are connected to the fourth resistor R4 and the first capacitor C1, which can provide the first switch Q1 with anti-interference capability.

[0052] According to some embodiments of this application, the second terminal of the adjustable voltage regulator U1 receives a first voltage from the voltage divider circuit 11. The third terminal of the adjustable voltage regulator U1 is used to reduce the output second voltage when the first voltage is greater than or equal to the reference voltage. That is, when the first voltage is greater than or equal to the reference voltage, the second voltage output from the third terminal of the adjustable voltage regulator U1 is reduced. At this time, current flows through the first and third terminals of the first switching transistor Q1, and the first switching transistor Q1 is turned on. That is, the first and second terminals of the first switching transistor Q1 are turned on. The third terminal of the third switching transistor Q3 receives the first reference voltage VCC through the fifth resistor R5, and the third switching transistor Q3 is turned on to discharge the voltage of the bus 30. When the first switching transistor Q1 is turned on, the drive circuit 13 outputs the first reference voltage VCC to the power circuit 20 to control the power circuit 20 to discharge.

[0053] In this embodiment, the second terminal of the adjustable voltage regulator U1 receives a first voltage from the voltage divider circuit 11, and the third terminal of the adjustable voltage regulator U1 is used to reduce the output second voltage when the first voltage is greater than or equal to the reference voltage. When the first switching transistor Q1 is turned on, it outputs a first reference voltage VCC to the power circuit 20 to control the power circuit 20 to discharge.

[0054] According to some embodiments of this application, the second terminal of the adjustable voltage regulator U1 receives a first voltage from the voltage divider circuit 11. The third terminal of the adjustable voltage regulator U1 is used to increase the output second voltage when the first voltage is less than the reference voltage, i.e., the second voltage approaches the first reference voltage VCC. The current at the first and third terminals of the first switch Q1 is cut off, and the first switch Q1 is turned off, i.e., the first and second terminals of the first switch Q1 are disconnected. The third terminal of the third switch Q3 is grounded through the sixth resistor R6, and the voltage at the third terminal of the third switch Q3 is released to 0V through the sixth resistor R6, thus turning off the third switch Q3. When the first switch Q1 is turned off, the voltage at the control terminal of the power circuit 20 is released through the sixth resistor R6 to control the power circuit 20 to stop discharging.

[0055] In this embodiment, the second terminal of the adjustable voltage regulator U1 receives the first voltage from the voltage divider circuit 11. The third terminal of the adjustable voltage regulator U1 is used to increase the output second voltage when the first voltage is less than the reference voltage. The first switching transistor Q1 is turned off, and the voltage at the control terminal of the power circuit 20 is released through the sixth resistor R6 to control the power circuit 20 to stop discharging.

[0056] According to some embodiments of this application, please refer to Figure 1As shown, the hysteresis circuit 14 in this embodiment includes a seventh resistor R7 and a first diode D1. The positive terminal of the first diode D1 is connected between the fifth resistor R5 and the sixth resistor R6, that is, the positive terminal of the first diode D1 is connected to the third terminal of the third switch Q3; the negative terminal of the first diode D1 is connected to the second terminal of the adjustable voltage regulator U1 through the seventh resistor R7.

[0057] When the voltage of bus 30 rises, the voltage at the third terminal of the third switch Q3 injects current into the second terminal of the adjustable regulator U1 through the first diode D1 and the seventh resistor R7, so that the voltage at the second terminal of the adjustable regulator U1 receives the first terminal voltage, which can prevent the third switch Q3 from frequently operating (i.e., turning on or off).

[0058] In some embodiments, by setting the resistance value of the seventh resistor R7, the voltage value at which the voltage of the bus 30 stops discharging can be set, that is, the voltage at the third terminal of the third switch Q3 can be set by setting the resistance value of the seventh resistor R7.

[0059] The hysteresis circuit 14 in this embodiment includes a seventh resistor R7 and a first diode D1. The anode of the first diode D1 is connected between the fifth resistor R5 and the sixth resistor R6, that is, the anode of the first diode D1 is connected to the third terminal of the third switch Q3. The cathode of the first diode D1 is connected to the second terminal of the adjustable voltage regulator U1 through the seventh resistor R7. When the voltage of the bus 30 rises, the voltage at the third terminal of the third switch Q3 injects current into the second terminal of the adjustable voltage regulator U1 through the first diode D1 and the seventh resistor R7, so that the voltage received at the second terminal of the adjustable voltage regulator U1 rises, thereby preventing the third switch Q3 from operating frequently.

[0060] According to some embodiments of this application, please refer to Figure 2 As shown, Figure 2 This is a circuit diagram of a second embodiment of the voltage discharge circuit provided in this application. The voltage discharge circuit 100 of this embodiment... Figure 1 The voltage discharge circuit 100 is described based on this.

[0061] The hysteresis circuit 14 in this embodiment also includes a Zener diode D and an eighth resistor R8. The positive terminal of the first diode D1 is connected between the fifth resistor R5 and the sixth resistor R6 through the eighth resistor R8. The positive terminal of the Zener diode D is grounded, and the negative terminal of the Zener diode D is connected between the eighth resistor R8 and the first diode D1.

[0062] Specifically, the third terminal of the third switch Q3 is connected to the positive terminal of the first diode D1 through the eighth resistor R8, and the negative terminal of the first diode D1 is connected to the second terminal of the adjustable voltage regulator U1 through the seventh resistor R7. The positive terminal of the Zener diode D is grounded, and the negative terminal of the Zener diode D is connected between the eighth resistor R8 and the first diode D1.

[0063] The hysteresis circuit 14 in this embodiment also includes a Zener diode D and an eighth resistor R8. The positive terminal of the first diode D1 is connected between the fifth resistor R5 and the sixth resistor R6 through the eighth resistor R8. The positive terminal of the Zener diode D is grounded, and the negative terminal of the Zener diode D is connected between the eighth resistor R8 and the first diode D1. The hysteresis parameters can be set through the Zener diode D and the eighth resistor R8 to improve control accuracy.

[0064] According to some embodiments of this application, please refer to Figure 3 As shown, Figure 3 This is a circuit diagram of the third embodiment of the voltage discharge circuit provided in this application. The voltage discharge circuit 100 of this embodiment... Figure 1 The voltage discharge circuit 100 is described based on this.

[0065] The voltage discharge circuit 100 in this embodiment also includes a shutdown circuit. The shutdown circuit is used to control the third switch Q3 to quickly disconnect, so as to control the power circuit 20 to quickly stop discharging. The shutdown circuit includes a ninth resistor R9, a tenth resistor R10, a Zener diode D, and a second switch Q2. The first terminal of the second switch Q2 is connected to the positive terminal of the first diode D1 through the ninth resistor R9. The second terminal of the second switch Q2 is grounded. The third terminal of the second switch Q2 is connected to the third terminal of the adjustable voltage regulator U1 through the Zener diode D. One end of the tenth resistor R10 is connected to the third terminal of the second switch Q2, and the other end of the tenth resistor R10 is grounded.

[0066] Specifically, the third terminal of the third switch Q3 is connected to the second terminal of the adjustable voltage regulator U1 through the first diode D1 and the seventh resistor R7. The third terminal of the third switch Q3 is connected to the first terminal of the second switch Q2 through the ninth resistor R9. The second terminal of the second switch Q2 is grounded. The third terminal of the second switch Q2 is connected to the third terminal of the adjustable voltage regulator U1 through the Zener diode D.

[0067] In some embodiments, the third terminal of the adjustable voltage regulator U1 is used to output a second voltage when the first voltage is less than the reference voltage. When the second voltage is greater than the voltage threshold of the Zener diode, the third terminal of the adjustable voltage regulator U1 is connected to the third terminal of the second switch Q2, the second switch Q2 is turned on, and the voltage at the control terminal of the power circuit 20 is released through the ninth resistor R9 and the second switch Q2 to control the power circuit 20 to quickly stop discharging.

[0068] In this embodiment, the second switch Q2 is an N-type MOSFET. The first terminal of the second switch Q2 is its source, the second terminal is its drain, and the third terminal is its gate. In other embodiments, the second switch Q2 can be other types of switches, which will not be elaborated further here.

[0069] In this embodiment, the third terminal of the adjustable voltage regulator U1 is used to output a second voltage when the first voltage is less than the reference voltage. When the second voltage is greater than the voltage threshold of the Zener diode, the third terminal of the adjustable voltage regulator U1 is connected to the third terminal of the second switch Q2, and the second switch Q2 is turned on. The voltage at the control terminal of the power circuit 20 is released through the ninth resistor R9 and the second switch Q2 to control the power circuit 20 to quickly stop discharging. This enables control of the power circuit 20 and reduces costs.

[0070] In summary, the voltage discharge circuit 100 of this application includes a control circuit 10 and a power circuit 20. The control circuit 10 is connected to the power circuit 20 and is used to control the power circuit 20 to discharge or stop discharging. The control circuit 10 includes: a voltage divider circuit 11 connected to the bus 30; a comparator circuit 12 connected to the voltage divider circuit 11 and used to receive a first voltage from the voltage divider circuit 11 and compare the first voltage with a preset reference voltage; a drive circuit 13 receiving a first reference voltage, connected to the comparator circuit 12, and connected to the power circuit 20. The drive circuit 13 is used to output a first reference voltage to the power circuit 20 when the first voltage is greater than or equal to the reference voltage, so as to control the power circuit 20 to discharge; and a hysteresis circuit 14, one end of which is connected to the power circuit 20, and the other end of which is connected between the voltage divider circuit 11 and the comparator circuit 12. The hysteresis circuit 14 is used to increase the first voltage when the drive circuit 13 outputs the first reference voltage VCC to the power circuit 20. The power circuit 20 is controlled by a voltage divider circuit 11, a comparator circuit 12, and a driver circuit 13. Compared with existing MCU chips, this reduces costs and occupies less space. Furthermore, the hysteresis circuit 14 increases the first voltage when the driver circuit 13 outputs the first reference voltage VCC to the power circuit 20, preventing the power circuit 20 from frequently discharging or stopping discharging, thus improving reliability.

[0071] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A voltage discharge circuit, characterized in that, The system includes a control circuit and a power circuit. The control circuit is connected to the power circuit and is used to control the power circuit to discharge or stop discharging. The control circuit includes: Voltage divider circuit, connected to the busbar; A comparator circuit, connected to the voltage divider circuit, is used to receive a first voltage from the voltage divider circuit and compare the first voltage with a preset reference voltage. A driving circuit receives a first reference voltage, is connected to the comparison circuit, and is connected to the power circuit. The driving circuit is used to output the first reference voltage to the power circuit when the first voltage is greater than or equal to the reference voltage, so as to control the power circuit to discharge. A hysteresis circuit, one end of which is connected to the power circuit, and the other end of which is connected between the voltage divider circuit and the comparator circuit, is used to increase the first voltage when the drive circuit outputs the first reference voltage to the power circuit.

2. The voltage discharge circuit according to claim 1, characterized in that, The voltage divider circuit includes a first resistor and a second resistor. One end of the first resistor is connected to the bus, and the other end of the first resistor is grounded through the second resistor. The comparison circuit includes an adjustable voltage regulator, with a first terminal grounded, a second terminal connected between the first resistor and the second resistor, and a third terminal connected to the drive circuit.

3. The voltage discharge circuit according to claim 2, characterized in that, The driving circuit includes a third resistor, a fourth resistor, a first capacitor, a first switching transistor, a fifth resistor, and a sixth resistor. The third terminal of the adjustable voltage regulator receives the first reference voltage through the third resistor and the fourth resistor in sequence. The first capacitor is connected in parallel with the fourth resistor. The first terminal of the first switching transistor is connected to one end of the fourth resistor and receives the first reference voltage. The second terminal of the first switching transistor is connected to the power circuit through the fifth resistor. The third terminal of the first switching transistor is connected to the other end of the fourth resistor. The second terminal of the first switching transistor is grounded through the fifth resistor and the sixth resistor.

4. The voltage discharge circuit according to claim 3, characterized in that, The second terminal of the adjustable voltage regulator receives the first voltage, and the third terminal of the adjustable voltage regulator is used to reduce the output second voltage when the first voltage is greater than or equal to the reference voltage. The first switch is turned on to output the first reference voltage to the power circuit to control the power circuit to discharge.

5. The voltage discharge circuit according to claim 3, characterized in that, The second terminal of the adjustable voltage regulator receives the first voltage, and the third terminal of the adjustable voltage regulator is used to output a second voltage increase when the first voltage is less than the reference voltage. The first switching transistor is turned off, and the voltage at the control terminal of the power circuit is released through the sixth resistor to control the power circuit to stop discharging.

6. The voltage discharge circuit according to any one of claims 1-5, characterized in that, The hysteresis circuit includes a seventh resistor and a first diode. The positive terminal of the first diode is connected between the fifth and sixth resistors, and the negative terminal of the first diode is connected to the second terminal of the adjustable voltage regulator through the seventh resistor.

7. The voltage discharge circuit according to claim 6, characterized in that, The hysteresis circuit further includes a Zener diode and an eighth resistor. The positive terminal of the first diode is connected between the fifth and sixth resistors through the eighth resistor. The positive terminal of the Zener diode is grounded, and the negative terminal of the Zener diode is connected between the eighth resistor and the first diode.

8. The voltage discharge circuit according to claim 6, characterized in that, The voltage discharge circuit further includes a shutdown circuit, which includes a ninth resistor, a tenth resistor, a Zener diode, and a second switching transistor. The first terminal of the second switching transistor is connected to the positive terminal of the first diode through the ninth resistor, the second terminal of the second switching transistor is grounded, the third terminal of the second switching transistor is connected to the third terminal of the adjustable voltage regulator through the Zener diode, one end of the tenth resistor is connected to the third terminal of the second switching transistor, and the other end of the tenth resistor is grounded.

9. The voltage discharge circuit according to claim 8, characterized in that, The third terminal of the adjustable voltage regulator is used to output a second voltage when the first voltage is less than the reference voltage. When the second voltage is greater than the voltage threshold of the Zener diode, the third terminal of the adjustable voltage regulator is connected to the third terminal of the second switching transistor, the second switching transistor is turned on, and the voltage of the control terminal of the power circuit is released through the ninth resistor and the second switching transistor to control the power circuit to quickly stop discharging.

10. An electronic device, characterized in that, Includes the voltage discharge circuit as described in any one of claims 1-9.

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