CN216625322U

CN216625322U - High-voltage discharge circuit, switching power supply device and high-voltage discharge equipment

Info

Publication number: CN216625322U
Application number: CN202122751436.2U
Authority: CN
Inventors: 朱兴锐; 赵德琦; 吴壬华
Original assignee: Shenzhen Shinry Technologies Co Ltd
Current assignee: Shenzhen Shinry Technologies Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-05-27
Anticipated expiration: 2031-11-10

Abstract

The application provides a high-voltage discharge circuit, a switching power supply device and high-voltage discharge equipment, wherein the high-voltage discharge circuit comprises an energy storage circuit, a voltage stabilizing circuit, a switching control circuit, a switching circuit and a discharge circuit, and the switching control circuit is used for controlling the switching circuit to be switched on or switched off; when the control switch circuit is conducted, the energy storage circuit discharges the discharge circuit; when the control switch circuit is switched off, the energy storage circuit stops discharging the discharge circuit; and the voltage stabilizing circuit is used for providing voltage for the switching circuit when the voltage at two ends of the energy storage circuit is lower than the voltage at two ends of the voltage stabilizing circuit so that the switching circuit can work normally. By adopting the high-voltage discharge circuit disclosed by the application, when abnormal low-voltage power failure or other unexpected conditions occur in the circuit, even if the energy storage energy of the circuit port is large, active discharge can be reliably performed.

Description

High-voltage discharge circuit, switching power supply device and high-voltage discharge equipment

Technical Field

The present application relates to the field of circuit structures, and in particular, to a high voltage discharge circuit, a switching power supply device, and a high voltage discharge apparatus.

Background

With the rapid development of social economy and the continuous improvement of the living standard of people, new energy automobiles come into operation, and the new energy automobiles are rapidly popularized in a large range due to comfort and environmental protection.

However, when the new energy automobile is collided during the driving process, the condition that the low-voltage signal port of the automobile is directly without electricity exists, and if the energy storage energy of the energy storage device in the automobile is large and the energy storage device cannot actively discharge, the port of the automobile is caused to have high voltage, so that the automobile has certain electric shock risk, and serious potential safety hazard exists for human body safety.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a high-voltage discharge circuit, a switching power supply device and high-voltage discharge equipment, and even if abnormal low-voltage power failure or other unexpected conditions occur in the circuit, active discharge can be reliably carried out.

In a first aspect, an embodiment of the present application provides a high voltage discharge circuit, where the circuit includes:

the energy storage circuit comprises an energy storage circuit, a voltage stabilizing circuit, a switch control circuit, a switch circuit and a discharge circuit, wherein a first port of the energy storage circuit is connected with a first port of the voltage stabilizing circuit and a first port of the discharge circuit; the second port of the voltage stabilizing circuit is connected with the first port of the switch control circuit; the second port of the switch control circuit is connected with the first port of the switch circuit; the second port of the switch circuit is connected with the second port of the discharge circuit; the second port of the energy storage circuit is connected with the third port of the voltage stabilizing circuit, the third port of the switch control circuit and the third port of the switch circuit;

the switch control circuit is used for controlling the on or off of the switch circuit; when the control switch circuit is conducted, the energy storage circuit discharges the discharge circuit; when the control switch circuit is switched off, the energy storage circuit stops discharging the discharge circuit;

and the voltage stabilizing circuit is used for providing voltage for the switching circuit when the voltage at two ends of the energy storage circuit is lower than the voltage at two ends of the voltage stabilizing circuit so that the switching circuit can work normally.

In one possible example, the voltage stabilizing circuit includes a first resistor and a first diode, wherein a first port of the first resistor is a first port of the voltage stabilizing circuit, a second port of the first resistor is connected with a cathode of the first diode, a cathode of the first diode is a second port of the voltage stabilizing circuit, and an anode of the first diode is a third port of the voltage stabilizing circuit.

In one possible example, the voltage stabilizing circuit further comprises a first capacitor, wherein an anode of the first capacitor is connected with a cathode of the first diode, and a cathode of the first capacitor is connected with an anode of the first diode.

In one possible example, the switch control circuit includes a second resistor, a third resistor, a fourth resistor, a first transistor, a second transistor, and a first switching device, wherein a first port of the second resistor is connected to a first port of the third resistor, the first port of the second resistor is a first port of the switch control circuit, a first port of the first transistor, a first port of the second transistor, and a first port of the fourth resistor are connected, the first port of the fourth resistor is a second port of the switch control circuit, the second port of the fourth resistor is connected to a first port of the first switching device, a third port of the second transistor, and the second port of the fourth resistor is a third port of the switch control circuit;

a second port of the second resistor is connected with a second port of the first transistor, a second port of the second transistor and a second port of the first switching device; the second port of the third resistor is connected with the third port of the first transistor;

when the second port and the first port of the first switching device are conducted, the third port and the first port of the first transistor are disconnected, the first port and the third port of the second transistor are conducted, and the voltage of the second port of the switching control circuit is at a low level;

when the second port and the first port of the first switching device are disconnected, the third port and the first port of the first transistor are connected, the first port and the third port of the second transistor are disconnected, and the voltage of the second port of the switching control circuit is at a high level.

In one possible example, the switch control circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, and a first switching device, wherein a first port of the second resistor is connected to a first port of the third resistor, the first port of the second resistor is a first port of the switch control circuit, a first port of the first transistor, a first port of the second transistor, and a first port of the fourth resistor are connected, the first port of the fourth resistor is a second port of the switch control circuit, the second port of the fourth resistor is connected to a first port of the fifth resistor, a third port of the second transistor, and a second port of the fourth resistor is a third port of the switch control circuit;

a first port of the first switching device is connected with a second port of the first transistor, a second port of the second transistor and a second port of the fifth resistor; the second port of the third resistor is connected with the third port of the first transistor; a second port of the second resistor is connected with a second port of the first switching device;

when the second port and the first port of the first switching device are conducted, the third port and the first port of the first transistor are conducted, the first port and the third port of the second transistor are disconnected, and the voltage of the second port of the switching control circuit is high level;

when the second port of the first switching device is disconnected with the first port, the third port of the first transistor is disconnected with the first port, the first port of the second transistor is connected with the third port of the first transistor, and the voltage of the second port of the switching control circuit is at a low level.

In one possible example, the first transistor is an NPN type transistor and the second transistor is a PNP type transistor;

the first port of the first transistor is an emitting electrode of an NPN type triode, and the first port of the second transistor is an emitting electrode of a PNP type triode;

the second port of the first transistor is the base electrode of an NPN type triode, and the second port of the second transistor is the base electrode of a PNP type triode;

the third port of the first transistor is the collector of the NPN type triode, and the third port of the second transistor is the collector of the PNP type triode.

In one possible example, the first switching device comprises any one of an isolation relay, a triode or a MOS transistor,

the third port of the first switching device is connected with a control signal, and the control signal is used for controlling the on or off of the first switching device.

In one possible example, the switching circuit includes a second switching device, a first port of the second switching device is a first port of the switching circuit, a second port of the second switching device is a second port of the switching circuit, and a third port of the second switching device is a third port of the switching circuit;

when the voltage of the first port of the switching circuit is at a high level, namely the voltage of the first port of the second switching device is at the high level, the second port and the third port of the second switching device are conducted;

when the voltage of the first port of the switching circuit is at a low level, that is, the voltage of the first port of the second switching device is at a low level, the second port and the third port of the second switching device are disconnected.

In a second aspect, an embodiment of the present application provides a switching power supply apparatus including the high voltage discharge circuit according to any one of the first aspect of the embodiment of the present application.

In a third aspect, an embodiment of the present application provides a high-voltage discharge device, where the high-voltage discharge device includes any one of the high-voltage discharge circuits in the first aspect of the embodiment of the present application.

It can be seen that, in the embodiment of the present application, the high-voltage discharge circuit includes an energy storage circuit, a voltage stabilizing circuit, a switch control circuit, a switch circuit and a discharge circuit, and the switch control circuit is used for controlling the on/off of the switch circuit; when the control switch circuit is conducted, the energy storage circuit discharges the discharge circuit; when the control switch circuit is switched off, the energy storage circuit stops discharging the discharge circuit; and the voltage stabilizing circuit is used for providing voltage for the switching circuit when the voltage at two ends of the energy storage circuit is lower than the voltage at two ends of the voltage stabilizing circuit so that the switching circuit can work normally. By adopting the high-voltage discharge circuit disclosed by the application, when abnormal low-voltage power failure or other unexpected conditions occur in the circuit, even if the energy storage energy of the circuit port is large, active discharge can be reliably performed.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1A is a schematic diagram of a prior art discharging circuit of an energy storage device;

fig. 1B is a schematic structural diagram of a high-voltage discharge circuit according to an embodiment of the present disclosure;

fig. 2A is a schematic structural diagram of a high-voltage discharge circuit according to an embodiment of the present disclosure;

fig. 2B is a schematic diagram of another specific structure of a high-voltage discharge circuit according to an embodiment of the present disclosure;

fig. 2C is a schematic diagram of another specific structure of a high-voltage discharge circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic view of an application scenario of a high-voltage discharge circuit according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a circuit, product or device that comprises a list of elements is not limited to those elements listed, but may alternatively include other elements not listed, or alternatively may include other elements inherent to such a circuit, product or device.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The following describes an application scenario related to an embodiment of the present application with reference to the drawings.

Fig. 1A is a schematic structural diagram of a discharge circuit of an energy storage device in the prior art. As shown in fig. 1A, in an energy storage device discharge circuit in the prior art, a discharge resistor is generally connected in parallel to two ends of the energy storage device directly, and the discharge resistor generates heat to consume energy stored in the capacitor, so as to reduce the voltage of the energy storage device to below the safe voltage within a predetermined time.

Meanwhile, if the energy storage energy of the energy storage device is large, because the requirement of fast discharging time is met, when the energy storage device discharging circuit in the prior art directly connects the discharging resistors in parallel at two ends of the energy storage device, the discharging resistor with smaller resistance and larger loss can be selected, and the discharging efficiency and the radiating angle of the resistor are considered, under the condition, the switching device can be used for controlling the energy storage device discharging circuit, as shown in (b) diagram in fig. 1A, when discharging is needed, the energy storage device discharges through the discharging resistor by closing the switching device, so that the problem that the discharging resistor discharges for a long time due to long-time discharging is avoided.

Although the above circuit can satisfy the requirement of rapid discharge of the energy storage device under the general condition, in a specific occasion, for example, when the vehicle is collided, the low-voltage control port of the vehicle internal circuit is abnormally powered off, the energy storage device in the vehicle internal circuit has large energy storage capacity, and the vehicle has the requirement of rapid discharge to the safe voltage within a specified time, obviously, in the specific occasion, the circuit described in the above mode is not suitable.

Accordingly, an embodiment of the present application provides a high voltage discharge circuit, please refer to fig. 1B, where fig. 1B is a schematic structural diagram of the high voltage discharge circuit provided in the embodiment of the present application, and as shown in fig. 1B, the circuit includes:

the circuit comprises an energy storage circuit 101, a voltage stabilizing circuit 102, a switch control circuit 103, a switch circuit 104 and a discharge circuit 105, wherein a first port 101a of the energy storage circuit 101 is connected with a first port 102a of the voltage stabilizing circuit 102 and a first port 105a of the discharge circuit 105; the second port 102b of the constant voltage circuit 102 is connected to the first port 103a of the switch control circuit 103; the second port 103b of the switch control circuit 103 is connected to the first port 104a of the switch circuit 104; the second port 104b of the switching circuit 104 is connected to the second port 105b of the discharging circuit 105; the second port 101b of the tank circuit 101 is connected to the third port 102c of the regulator circuit 102, the third port 103c of the switch control circuit 103, and the third port 104c of the switch circuit 104;

a switch control circuit 103 for controlling on/off of the switch circuit 104; when the control switch circuit 104 is turned on, the energy storage circuit 101 discharges the discharge circuit 105; when the control switch circuit 104 is turned off, the tank circuit 101 stops discharging the discharge circuit 105;

the voltage stabilizing circuit 102 is used for providing voltage for the switch circuit 104 when the voltage at two ends of the energy storage circuit 101 is lower than the voltage at two ends of the voltage stabilizing circuit 102, so that the switch circuit 104 can work normally.

The on/off of the switch circuit 104 specifically refers to: the second port 104b and the third port 104c of the switching circuit 104 are turned on or off.

The energy storage circuit 101, in a specific implementation, may include an energy storage device, and the energy storage device may be a capacitor or a battery. The first port of the energy storage device is the first port of the energy storage circuit, and the second port of the energy storage device is the second port of the energy storage circuit.

The discharge circuit 105, in a specific implementation, may include a discharge resistor. The first port of the discharge resistor is the first port of the discharge circuit, and the second port of the discharge resistor is the second port of the discharge circuit.

For example, referring to fig. 2A, fig. 2A is a schematic diagram of a specific structure of a high-voltage discharge circuit according to an embodiment of the present disclosure, as shown in fig. 2A, the energy storage circuit 101 includes an energy storage capacitor C1, an anode of the energy storage capacitor C1 is a first port 101a of the energy storage circuit 101, and a cathode thereof is a second port 101b of the energy storage circuit 101. The discharge circuit 105 includes a discharge resistor R6, a first port of the discharge resistor R6 is a first port 105a of the discharge circuit 105, and a second port is a second port 105b of the discharge circuit 105.

In one possible example, please refer to fig. 2A, fig. 2A is a schematic diagram illustrating a specific structure of a high voltage discharge circuit according to an embodiment of the present disclosure, as shown in fig. 2A, a voltage regulator circuit 102 includes a first resistor R1 and a first diode ZD1, wherein a first port of the first resistor R1 is a first port 102A of the voltage regulator circuit 102, a second port of the first resistor R1 is connected to a negative electrode of a first diode ZD1, a negative electrode of the first diode ZD1 is a second port 102b of the voltage regulator circuit 102, and a positive electrode of the first diode is a third port 102c of the voltage regulator circuit 102.

The driving voltage of the switch circuit 104 satisfies the on condition of the switch circuit 104 by the voltage dividing function of the first resistor R1.

The first diode ZD1 is used to avoid that the voltage at two ends of the discharge circuit 105 is greater than the driving voltage of the switch circuit 104 in the process of fast discharging of the energy storage circuit 101, so as to avoid the problem of stopping discharging caused by the switch circuit 104 being unable to be turned on in the process of fast discharging of the energy storage circuit 101; meanwhile, by changing the voltage value of the first diode ZD1, the turn-on condition of the switch circuit 104 having different driving voltage requirements in an actual application scenario can be satisfied.

In a possible example, please refer to fig. 2A, fig. 2A is a schematic diagram illustrating a specific structure of a high voltage discharge circuit according to an embodiment of the present application, and as shown in fig. 2A, the voltage regulator circuit further includes a first capacitor C2, an anode of the first capacitor C2 is connected to a cathode of the first diode ZD1, and a cathode of the first capacitor C2 is connected to an anode of the first diode ZD 1.

The first capacitor C2 is configured to provide a driving voltage for the switch circuit 104 through the first capacitor C2 if the actual operating voltage of the first diode ZD1 is less than the turn-on voltage of the first diode ZD1 in the process of rapid discharge of the energy storage circuit 101, so that the switch circuit 104 can be ensured to be turned on when the voltage at the two ends of the energy storage circuit 101 is low, and the energy storage circuit 101 can continue to discharge the discharge circuit 105.

It can be seen that, in the embodiment of the application, the voltage stabilizing circuit can meet the conduction conditions of the switch circuits with different driving voltage requirements in an actual application scene. In some specific occasions, if high-voltage partial voltage is used as driving voltage to directly drive the switch circuit, the driving voltage of the switch circuit after partial voltage is gradually reduced along with the reduction of the high voltage in the gradual discharging process of the high-voltage discharge circuit, so that the driving voltage is not enough to conduct the switch circuit.

In one possible example, referring to fig. 2A, fig. 2A is a specific structural schematic diagram of a high voltage discharge circuit provided in an embodiment of the present application, as shown in fig. 2A, the switch control circuit 103 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first transistor Q1, a second transistor Q2, and a first switching device Q3, wherein a first port of the second resistor R2 is connected to a first port of the third resistor R3, a first port of the second resistor R2 is a first port 103a of the switch control circuit 103, a first port of the first transistor Q1, a first port of the second transistor Q2, and a first port of the fourth resistor R4 are connected to a first port of the switch control circuit 103, a first port of the fourth resistor R4 is a second port 103b of the switch control circuit 103, a second port of the fourth resistor R4 is connected to a first port of the first switching device Q3 and a third port 2 of the first switching device Q3, the second port of the fourth resistor R4 is the third port 103c of the switch control circuit 103;

a second port of the second resistor R2 is connected to a second port of the first transistor Q1, a second port of the second transistor Q2, and a second port of the first switching device Q3; a second port of the third resistor R3 is connected to a third port of the first transistor Q1;

when the second port and the first port of the first switching device Q3 are turned on, the third port and the first port of the first transistor Q1 are turned off, the first port and the third port of the second transistor Q2 are turned on, and the voltage of the second port 103b of the switch control circuit 103 is at a low level;

when the second port and the first port of the first switching device Q3 are disconnected, the third port and the first port of the first transistor Q1 are connected, the first port and the third port of the second transistor Q2 are disconnected, and the voltage of the second port 103b of the switch control circuit 103 is at a high level.

In the circuit shown in fig. 2A, when the voltage of the second port 103b of the switch control circuit 103 is at a low level, the switch circuit 104 is turned off, and the tank circuit 101 stops discharging the discharge circuit 105; when the voltage at the second port 103b of the switch control circuit 103 is at a high level, the switch circuit 104 is turned on, and the tank circuit 101 discharges to the discharge circuit 105.

For example, the first switching device Q3 may be an isolation switch in a specific implementation, the first port and the second port of the first switching device Q3 are controlled terminals of the isolation switch, the third port is a control terminal of the isolation switch, and the third port is connected to a control signal, where the control signal includes a high-level signal and a low-level signal. The low level signal refers to that the voltage output by the control signal is less than a preset voltage threshold (e.g., 1.5V), or the output voltage is 0. In an application scenario, when the high-voltage discharge circuit shown in fig. 2A is applied in a vehicle, the output voltage of the control signal is 0 when the vehicle collides.

In still another exemplary application scenario, particularly in a vehicle in which the high voltage discharge circuit shown in fig. 2A is applied, if the vehicle collision causes the control signal output voltage to be 0, that is, at this time, the voltage of the third port of the first switching device Q3 is at a low level, the second port of the first switching device Q3 is disconnected from the first port, the third port of the first transistor Q1 is connected to the first port, and the first port of the second transistor Q2 is disconnected from the third port, that is, when the first switching device Q3 is turned off, the first transistor Q1 is turned on and the second transistor Q2 is turned off, the voltage of the second port 103b of the switch control circuit 103 is at a high level, so that the switch circuit 104 is turned on, and then the energy storage circuit 101 discharges to the discharge circuit 105, reduces the vehicle voltage to below the human safety voltage 36V fast, avoids the electric shock risk of the vehicle and guarantees the human safety. On the contrary, when the control signal is a high level signal, that is, the third port of the first switching device Q3 is at a high level at this time, the second port of the first switching device Q3 is connected to the first port, the third port of the first transistor Q1 is disconnected from the first port, and the first port of the second transistor Q2 is connected, that is, when the first device Q3 is connected, the first transistor Q1 is disconnected, the second transistor Q2 is connected, the voltage of the second port 103b of the switching control circuit 103 is at a low voltage, so that the switching circuit 104 is disconnected, and the energy storage circuit 101 stops discharging the discharge 105.

In one possible example, please refer to fig. 2B, where fig. 2B is a schematic diagram of a specific structure of another high-voltage discharge circuit provided in this embodiment of the present application, as shown in fig. 2B, the switch control circuit 103 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor Q1, a second transistor Q2, and a first switching device Q3, where a first port of the second resistor R2 is connected to a first port of the third resistor R3, a first port of the second resistor R2 is a first port of the switch control circuit 103, a first port of the first transistor Q1, a first port of the second transistor Q2 and a first port of the fourth resistor R4, a first port of the fourth resistor R4 is a second port of the switch control circuit 103, a second port of the fourth resistor R4 is connected to a first port of the fifth resistor R5 and a third port of the third transistor Q2, a second port of the fourth resistor R4 is a third port of the switch control circuit 103;

a first port of the first switching device Q3 is connected with a second port of the first transistor Q1, a second port of the second transistor Q2 and a second port of the fifth resistor R5; a second port of the third resistor R3 is connected to a third port of the first transistor Q1; a second port of the second resistor R2 is connected with a second port of the first switching device Q3;

when the second port and the first port of the first switching device Q3 are turned on, the third port and the first port of the first transistor Q1 are turned on, the first port and the third port of the second transistor Q2 are turned off, and the voltage of the second port of the switch control circuit 103 is at a high level;

when the second port of the first switching device Q3 is disconnected from the first port, the third port of the first transistor Q1 is disconnected from the first port, the first port of the second transistor Q2 is connected to the third port, and the voltage of the second port of the switch control circuit 103 is low.

In the circuit shown in fig. 2B, when the voltage at the second port 103B of the switch control circuit 103 is at a high level, the switch circuit 104 is turned on, and the tank circuit 101 discharges to the discharge circuit 105; when the voltage of the second port 103b of the switch control circuit 103 is low, the switch circuit 104 is turned off, and the tank circuit 101 stops discharging the discharge circuit 105.

In the circuits shown in fig. 2A and 2B, the second resistor R2 functions as a pull-up resistor, and the voltage of the second port of the first diode Q1 is pulled up by the second resistor R2 to satisfy the turn-on condition of the first diode Q1. In a specific implementation, the second resistor R2 may have a magnitude of 10K Ω.

In the circuits shown in fig. 2A and 2B, the driving voltage of the switch circuit 104 satisfies the on condition of the switch circuit 104 by the voltage division between the third resistor R3 and the fourth resistor R4.

In the circuit shown in fig. 2B, the fifth resistor R5 functions as a pull-down resistor, and when the control signal is a low-level signal, the voltage of the second port of the second transistor Q2 is pulled down to a low level by the voltage pull-down function of the fifth resistor R5, so that the switch circuit 104 is turned off, and the energy storage circuit 101 stops discharging the discharge circuit 105.

For example, in the circuits shown in fig. 2A and fig. 2B, the first switching device Q3 may be a disconnecting switch in a specific implementation, the first port and the second port of the first switching device Q3 are controlled terminals of the disconnecting switch, the third port is a control terminal of the disconnecting switch, and the third port is connected to a control signal, where the control signal includes a high-level signal and a low-level signal. The low level signal refers to that the voltage output by the control signal is less than a preset voltage threshold (e.g., 1.5V), or the output voltage is 0.

Specifically, in an application scenario, when the high-voltage discharge circuit shown in fig. 2B is applied to a situation where a control signal is a high-level signal to perform discharge, at this time, the third port of the first switching device Q3 receives the high-level signal, the second port of the first switching device Q3 is connected to the first port, the third port of the first transistor Q1 is connected to the first port, the first port of the second transistor Q2 is disconnected from the third port, and the voltage of the second port of the switch control circuit 103 is a high level, so that the switch circuit 104 is connected, and the energy storage circuit 101 discharges the discharge circuit 105, thereby completing a purpose of discharging the high-voltage discharge circuit when the control signal is the high-level signal; conversely, if the tank circuit 101 stops discharging the discharge circuit 105, the voltage of the third port of the first switching device Q3 is only required to be low. It can be seen that, with the high-voltage discharge circuit shown in fig. 2B, it can be realized that the high-voltage discharge circuit discharges when the control signal is a high-level signal; and when the control signal is a low level signal or the control signal is powered off, the discharging circuit stops discharging.

It can be seen that in the embodiment of the present application, the switch control circuit controls the first transistor and the second transistor to be turned on or off through the first switching device, so as to control the switching circuit to be turned on or off, and when the switch control circuit controls the switching circuit to be turned on, the energy storage circuit discharges to the discharge circuit; when the switch control circuit controls the switch circuit to be disconnected, the energy storage circuit stops discharging the discharging circuit. By adopting the circuit provided by the embodiment of the application, the first transistor and the second transistor can be controlled to be switched on or switched off by giving different control signals to the first switch device, so that the switching on or switching off of the switch circuit is controlled, and the requirement of quick discharge of the energy storage circuit is met while the working state conversion difficulty of the high-voltage discharge circuit is reduced.

In a possible example, please refer to fig. 2A, fig. 2A is a schematic diagram of a specific structure of a high voltage discharging circuit according to an embodiment of the present disclosure, as shown in fig. 2A, the first transistor Q1 is an NPN transistor and the second transistor Q2 is a PNP transistor;

the first port of the first transistor Q1 is an emitter of an NPN-type triode, and the first port of the second transistor Q2 is an emitter of a PNP-type triode;

the second port of the first transistor Q1 is the base of an NPN type triode, and the second port of the second transistor Q2 is the base of a PNP type triode;

the third port of the first transistor Q1 is a collector of an NPN type transistor, and the third port of the second transistor Q2 is a collector of a PNP type transistor.

The third port and the first port of the first transistor Q1 are connected, specifically: the collector and the emitter of the NPN type triode are conducted; the third port and the first port of the first transistor Q1 are disconnected, specifically: the collector and the emitter of the NPN type triode are cut off.

The first port and the third port of the second transistor Q2 are connected, specifically: the emitter and collector of the PNP type triode are conducted; the first port and the third port of the second transistor Q2 are disconnected, specifically: the emitting electrode and the collecting electrode of the PNP type triode are cut off.

It should be noted that the first transistor Q1 and the second transistor Q2 may also be MOS transistors, and for example, in a specific implementation, if the first transistor Q1 and the second transistor Q2 are MOS transistors, the first transistor Q1 is an N-type MOS transistor and the second transistor Q2 is a P-type MOS transistor. In this example, the operation principle of the circuit can be specifically referred to the related description of the operation principle of fig. 2A, and will not be described here.

In one possible example, the first switching device Q3 includes any one of an isolation relay, a transistor or a MOS transistor,

the third port of the first switching device Q3 is connected to a control signal for controlling the on/off of the first switching device Q3.

Since the isolation relay, the triode or the MOS transistor are all switching devices, the first port and the second port of the first switching device Q3 are controlled ends of the switching devices, the third port is a control end of the switching devices, the third port is connected with a control signal, and the control signal includes a high level signal and a low level signal. The low level signal refers to that the voltage output by the control signal is less than a preset voltage threshold (e.g., 1.5V), or the output voltage is 0.

Wherein the transistor comprises a photo transistor. The phototriode uses optical signals as media to realize the coupling and transmission of electric signals, and the control end and the controlled end are completely isolated electrically, so that the phototriode has the characteristic of strong anti-interference performance.

Illustratively, if the first switching device Q3 is a phototransistor in a triode, the third port of the first switching device Q3 is an output terminal of a control signal, the output terminal of the control signal is connected with a light emitting diode, the second port of the first switching device Q3 is a collector of the phototransistor, and the first port of the first switching device Q3 is an emitter of the phototransistor. When the control signal is a high level signal, the light emitting diode emits light, so that the collector and the emitter of the phototriode are conducted. It can be seen that the phototriode is suitable for being applied to occasions where electrical isolation control needs to be performed on the high-voltage discharge circuit provided by the embodiment of the application.

For another example, in a situation where the high-voltage discharge circuit provided in the embodiment of the present application does not need to be electrically isolated and controlled, referring to fig. 2C, fig. 2C is a schematic diagram of a specific structure of another high-voltage discharge circuit provided in the embodiment of the present application, as shown in fig. 2C, if the first switching device Q3 is a triode, the third port of the first switching device Q3, i.e., the base of the triode, is directly connected to the control signal, and the control signal directly controls the conduction or the cutoff between the collector and the emitter of the triode, i.e., the conduction or the cutoff of the first switching device Q3, so as to achieve the purpose of controlling the conduction or the cutoff of the switching circuit 104.

It can be seen that, in the embodiment of the application, the first transistor and the second transistor are controlled to be switched on or switched off by giving different control signals to the first switch device, so that the switching on or switching off of the switch circuit is controlled, and the requirement of rapid discharging of the energy storage circuit is met while the working state conversion difficulty of the high-voltage discharging circuit is reduced.

In one possible example, please refer to fig. 2A, fig. 2A is a schematic diagram of a specific structure of a high voltage discharge circuit provided in an embodiment of the present application, as shown in fig. 2A, the switch circuit 104 includes a second switch device Q4, a first port of the second switch device Q4 is a first port 104a of the switch circuit 104, a second port of the second switch device Q4 is a second port 104b of the switch circuit 104, and a third port of the second switch device Q4 is a third port 104c of the switch circuit;

when the voltage at the first port 104a of the switching circuit 104 is at a high level, that is, the voltage at the first port of the second switching device Q4 is at a high level, the second port and the third port of the second switching device Q4 are conducted, so that the switching circuit 104 is conducted;

when the voltage of the first port 104a of the switching circuit 104 is at a low level, that is, the voltage of the first port of the second switching device Q4 is at a low level, the second port and the third port of the second switching device Q4 are disconnected, and thus the switching circuit 104 is turned off.

In a specific implementation, the second switching device Q4 may be an insulated gate bipolar transistor IGBT, and the first port of the second switching device Q4 is a gate of the IGBT, the second port is a drain of the IGBT, and the third port is a source of the IGBT.

In the embodiment of the present application, when the second port and the third port of the second switching device are turned on, the switching circuit is turned on, so that the energy storage circuit discharges to the discharging circuit; when the second port and the third port of the second switching device are disconnected, the switching circuit is disconnected, so that the energy storage circuit stops discharging the discharging circuit. The change of the working state of the high-voltage discharge circuit between discharge and discharge stopping is realized.

In the embodiments provided in the present application, it should be understood that the high voltage discharge circuit disclosed in the embodiments of the present application can be implemented in other ways. For example, the embodiments of the high voltage discharge circuit described above are merely illustrative, and for example, the components in the circuit may be other components with the same functions. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, circuits or components, and may be in an electrical or other form.

In addition, each circuit in the embodiments of the present application may be integrated in one circuit board, or each circuit may exist alone, or two or more circuits may be integrated in one circuit board.

The embodiment of the application also provides a switching power supply device which comprises the high-voltage discharge circuit provided by any application embodiment. The high-voltage discharge circuit in the switching power supply device is the same as the high-voltage discharge circuit described in any of the embodiments of the above-mentioned application, and is not described herein again.

Referring to fig. 3, fig. 3 is a schematic view of an application scenario of a high-voltage discharge circuit according to an embodiment of the present application, and as shown in fig. 3, the application scenario includes a switching power supply device 30 and an electrical appliance 31, where the switching power supply device 30 is connected to the electrical appliance 31.

The switching power supply device 30 includes a power supply 301 and a high-voltage discharge circuit 302; first port 302a of high-voltage discharge circuit 302 is connected to power supply 301, and second port 302b of high-voltage discharge circuit 302 is connected to consumer 31.

The high-voltage discharge circuit 302 controls the connection and disconnection of the loop between the power supply 301 and the electrical appliance 31, thereby realizing the function of a switching power supply.

The electrical equipment 31 may be a vehicle.

It should be noted that the high-voltage discharge circuit disclosed in the present invention can also be applied to other electronic devices, such as an inverter.

It should be understood by those skilled in the art that, when implementing the circuit described in any of the embodiments of the application, the apparatus disclosed in the several embodiments provided in the present application may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described circuit may be divided into only one type of logic function, and may be implemented in other ways, for example, multiple circuits or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or circuits, and may be in an electrical or other form.

The embodiment of the application also provides high-voltage discharge equipment, and the high-voltage discharge equipment comprises the high-voltage discharge circuit provided by any application embodiment. The high-voltage discharge circuit in the high-voltage discharge device is the same as the high-voltage discharge circuit described in any of the embodiments of the above application, and is not described herein again.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

While the preferred embodiments of the present application have been illustrated above with reference to the accompanying drawings, those skilled in the art can implement the present application in various modifications without departing from the scope and spirit of the present application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not intended to limit the scope of the present application, which is defined by the appended claims and their equivalents.

The above embodiments of the present application are described in detail, and the principles and implementations of the high voltage discharge circuit, the switching power supply device and the high voltage discharge apparatus of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the circuit and the core idea of the present application; meanwhile, for those skilled in the art, according to the ideas of the high voltage discharge circuit, the switching power supply device and the high voltage discharge apparatus of the present application, the specific implementation and the application range may be changed, and in summary, the content of the present specification should not be construed as limiting the present application.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

It is apparent that those skilled in the art can make various changes and modifications to the high voltage discharge circuit, the switching power supply device, and the high voltage discharge apparatus provided in the present application without departing from the spirit and scope of the present application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A high voltage discharge circuit, comprising:

the switch control circuit is used for controlling the on or off of the switch circuit; when the switch circuit is controlled to be conducted, the energy storage circuit discharges the discharge circuit; when the switch circuit is controlled to be switched off, the energy storage circuit stops discharging the discharge circuit;

2. The circuit of claim 1,

the voltage stabilizing circuit comprises a first resistor and a first diode, wherein a first port of the first resistor is a first port of the voltage stabilizing circuit, a second port of the first resistor is connected with a negative electrode of the first diode, a negative electrode of the first diode is a second port of the voltage stabilizing circuit, and a positive electrode of the first diode is a third port of the voltage stabilizing circuit.

3. The circuit of claim 2,

the voltage stabilizing circuit further comprises a first capacitor, wherein the anode of the first capacitor is connected with the cathode of the first diode, and the cathode of the first capacitor is connected with the anode of the first diode.

4. The circuit of claim 1,

the switch control circuit comprises a second resistor, a third resistor, a fourth resistor, a first transistor, a second transistor and a first switch device, wherein a first port of the second resistor is connected with a first port of the third resistor, the first port of the second resistor is a first port of the switch control circuit, a first port of the first transistor, a first port of the second transistor and a first port of the fourth resistor are connected, the first port of the fourth resistor is a second port of the switch control circuit, the second port of the fourth resistor is connected with a first port of the first switch device and a third port of the second transistor, and the second port of the fourth resistor is a third port of the switch control circuit;

a second port of the second resistor is connected with a second port of the first transistor, a second port of the second transistor and a second port of the first switching device; a second port of the third resistor is connected with a third port of the first transistor;

when the second port and the first port of the first switching device are connected, the third port and the first port of the first transistor are disconnected, the first port and the third port of the second transistor are connected, and the voltage of the second port of the switching control circuit is at a low level;

when the second port and the first port of the first switching device are disconnected, the third port and the first port of the first transistor are connected, the first port and the third port of the second transistor are disconnected, and the voltage of the second port of the switching control circuit is high level.

5. The circuit of claim 1,

the switch control circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor and a first switching device, wherein a first port of the second resistor is connected with a first port of the third resistor, a first port of the second resistor is a first port of the switch control circuit, a first port of the first transistor, a first port of the second transistor and a first port of the fourth resistor are connected, a first port of the fourth resistor is a second port of the switch control circuit, a second port of the fourth resistor is connected with a first port of the fifth resistor and a third port of the second transistor, and a second port of the fourth resistor is a third port of the switch control circuit;

a first port of the first switching device is connected with a second port of the first transistor, a second port of the second transistor and a second port of the fifth resistor; a second port of the third resistor is connected with a third port of the first transistor; a second port of the second resistor is connected with a second port of the first switching device;

when the second port and the first port of the first switching device are connected, the third port and the first port of the first transistor are connected, the first port and the third port of the second transistor are disconnected, and the voltage of the second port of the switching control circuit is high level;

when the second port and the first port of the first switching device are disconnected, the third port and the first port of the first transistor are disconnected, the first port and the third port of the second transistor are connected, and the voltage of the second port of the switching control circuit is low level.

6. The circuit of claim 4 or 5,

the first transistor is an NPN type triode and the second transistor is a PNP type triode;

the first port of the first transistor is an emitter of the NPN type triode, and the first port of the second transistor is an emitter of the PNP type triode;

the second port of the first transistor is the base electrode of the NPN type triode, and the second port of the second transistor is the base electrode of the PNP type triode;

the third port of the first transistor is a collector of the NPN type triode, and the third port of the second transistor is a collector of the PNP type triode.

7. The circuit of claim 4 or 5,

the first switching device comprises any one of an isolation relay, a triode or a MOS tube,

and the third port of the first switching device is connected with a control signal, and the control signal is used for controlling the on or off of the first switching device.

8. The circuit according to any one of claims 1-3,

the switch circuit comprises a second switch device, a first port of the second switch device is a first port of the switch circuit, a second port of the second switch device is a second port of the switch circuit, and a third port of the second switch device is a third port of the switch circuit;

when the voltage of the first port of the switching circuit is at a high level, that is, the voltage of the first port of the second switching device is at a high level, the second port and the third port of the second switching device are conducted;

9. A switching power supply unit, characterized in that it comprises a high-voltage discharge circuit according to any one of claims 1-8.

10. A high voltage discharge device, characterized in that it comprises a high voltage discharge circuit according to any one of claims 1 to 8 or a switching power supply apparatus according to claim 9.