CN216016840U - Power switch circuit and electric automobile - Google Patents
Power switch circuit and electric automobile Download PDFInfo
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- CN216016840U CN216016840U CN202122498450.6U CN202122498450U CN216016840U CN 216016840 U CN216016840 U CN 216016840U CN 202122498450 U CN202122498450 U CN 202122498450U CN 216016840 U CN216016840 U CN 216016840U
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Abstract
The utility model provides a power switch circuit and an electric automobile, relating to the technical field of electronic circuits, wherein the power switch circuit comprises a power switch, a bias resistor and an auxiliary discharge circuit; the power switch is conducted under the condition that the power supply is at a positive voltage; the auxiliary bleeder circuit is disconnected under the condition that the power supply is positive voltage and is switched on under the condition that the power supply is negative voltage, and the switching-on resistance between the first end and the third end of the auxiliary bleeder circuit is smaller than the resistance of the bias resistor. Use the utility model provides a circuit, when negative voltage appears in the feeder terminal of electronic control unit, switch's control end equivalent capacitance will carry out quick discharge through the less supplementary bleeder circuit of resistance, compares with the switch circuit that does not set up supplementary bleeder circuit, can shorten switch's turn-off time effectively, and then prevents that the inside steady voltage electric capacity of electronic control unit is because externally discharging too much in the twinkling of an eye, leads to the unusual technical problem of electronic control unit work.
Description
Technical Field
The utility model belongs to the technical field of electronic circuit's technique and specifically relates to a switch circuit and electric automobile are related to.
Background
An ECU (Electronic Control Unit), also called a "vehicle computer" or a "vehicle-mounted computer", is generally connected in parallel with an inductive load (e.g., a motor), both of which take power from a vehicle-mounted storage battery, and when the storage battery is powered off, the inductive load generates a negative voltage, a voltage stabilizing capacitor inside the ECU discharges the inductive load, and if a discharging path cannot be cut off in time, the voltage of the voltage stabilizing capacitor of the ECU drops below a preset threshold, the ECU is powered off or reset, and the use of a user is seriously affected due to abnormality of the ECU.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a switch circuit and electric automobile to shorten switch's turn-off time, and then prevent that the inside steady voltage electric capacity of electronic control unit from leading to the unusual technical problem of electronic control unit work to the external discharge time overlength.
In a first aspect, the present invention provides a power switch circuit, including: the power switch, the bias resistor and the auxiliary bleeder circuit; the first end of the power switch is connected with a power supply, the second end of the power switch is respectively connected with the first end of the bias resistor and the first end of the auxiliary bleeder circuit, and the third end of the power switch is respectively connected with the second end of the auxiliary bleeder circuit and the power supply end of the electronic control unit; the second end of the bias resistor and the third end of the auxiliary bleeder circuit are connected with a ground terminal; the bias resistor is used for providing bias voltage for the power switch; the power switch is used for being conducted under the condition that the power supply is in a positive voltage, so that the power supply supplies power to the electronic control unit; the auxiliary bleeder circuit is used for being switched off under the condition that the power supply is positive voltage, and being switched on under the condition that the power supply is negative voltage, and under the switching-on condition, the resistance between the first end and the third end of the auxiliary bleeder circuit is smaller than the resistance of the bias resistor.
In an alternative embodiment, the power switching circuit further comprises: a clamp circuit; the first end of the clamping circuit is connected with the second end of the power switch, and the second end of the clamping circuit is connected with the third end of the power switch; the clamping circuit is used for preventing the voltage between the third end and the second end of the power switch from exceeding a preset threshold value.
In an alternative embodiment, the power switching circuit further comprises: a filter circuit; the first end of the filter circuit is respectively connected with the power supply and the first end of the power switch, and the second end of the filter circuit is connected with the grounding end.
In an alternative embodiment, the power switching circuit further comprises: a first diode; the anode of the first diode is connected with the first end of the power switch, and the cathode of the first diode is connected with the third end of the power switch.
In an alternative embodiment, the auxiliary bleeding circuit includes: the device comprises a bleeder resistor, a current-limiting resistor and a switching tube; the first end of the bleeder resistor is connected with the first end of the auxiliary bleeder circuit, and the second end of the bleeder resistor is connected with the first end of the switch tube; the second end of the switch tube is connected with the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected with the second end of the auxiliary bleeder circuit; and the third end of the switching tube is connected with the third end of the auxiliary bleeder circuit.
In an alternative embodiment, the switching tube comprises: PNP type triode.
In an alternative embodiment, the power switch comprises: a P-channel MOSFET.
In an alternative embodiment, the clamping circuit includes: a zener diode.
In an alternative embodiment, the filter circuit comprises: a first capacitor.
In a second aspect, the present invention provides an electric vehicle including the power switch circuit of any one of the above embodiments.
The utility model provides a power switch circuit, include: the power switch, the bias resistor and the auxiliary bleeder circuit; the first end of the power switch is connected with a power supply, the second end of the power switch is respectively connected with the first end of the bias resistor and the first end of the auxiliary bleeder circuit, and the third end of the power switch is respectively connected with the second end of the auxiliary bleeder circuit and the power supply end of the electronic control unit; the second end of the bias resistor and the third end of the auxiliary bleeder circuit are connected with the grounding end; the bias resistor is used for providing bias voltage for the power switch; the power switch is used for conducting under the condition that the power supply is positive voltage so that the power supply supplies power to the electronic control unit; the auxiliary bleeder circuit is used for being disconnected under the condition that the power supply is the positive voltage, and is switched on under the condition that the power supply is the negative voltage, and under the switching-on condition, the resistance between the first end and the third end of the auxiliary bleeder circuit is smaller than the resistance of the bias resistor.
Use the utility model provides a power switch circuit, when negative voltage appears in the feed end of electronic control unit, switch's control end equivalent capacitance will carry out quick discharge through the less supplementary bleeder circuit of resistance, compares with the power switch circuit that does not set up supplementary bleeder circuit, can shorten switch's turn-off time effectively, and then prevents that the inside steady voltage electric capacity of electronic control unit is because externally discharging too much in the twinkling of an eye, leads to the unusual technical problem of electronic control unit work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a circuit connection between a power supply and an inductive load and an ECU according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a waveform change of a power supply in an experiment of an ECU according to an embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of a power switch circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit connection diagram of an alternative power switch circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit connection diagram of another alternative power switch circuit provided in an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a power switch circuit according to an embodiment of the present invention.
Icon: 100-a power switch; 200-an auxiliary bleeding circuit; 300-an electronic control unit; 400-a clamp circuit; 500-a filter circuit; 301-in-board consumer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
When an electrical test is performed on a vehicle-mounted ECU, it is generally necessary to simulate a transient phenomenon generated when a power supply is disconnected from an inductive load, and the test is suitable for a situation that the ECU is connected in parallel with the inductive load, a schematic diagram of circuit connection between the power supply, the inductive load and the ECU is shown in fig. 1, and the relevant test requirements can refer to the standard contents of ISO 7637-2. As shown in fig. 1, after the power supply is cut off, because the power switch circuit of the ECU cannot be quickly turned off, the large-capacity voltage-stabilizing capacitor inside the ECU discharges inductive load, if the turn-off speed of the power switch circuit is too slow, the discharge time of the voltage-stabilizing capacitor of the ECU is too long, when the voltage of the terminal of the voltage-stabilizing capacitor is reduced below a preset threshold value, the problems of power failure or reset of the ECU occur, and the use of the ECU is seriously affected due to abnormality of the ECU. Embodiments of the present invention provide a power switch circuit to alleviate the above-mentioned technical problems.
Example one
In order to simulate the transient phenomenon generated when the power supply is disconnected from the inductive load, when the vehicle-mounted ECU is electrically tested, the actual inductive load is not actually mounted, but the power supply VBAT of the power switching circuit of the ECU is used to simulate the above situation, and fig. 2 is a schematic diagram of the waveform change of the power supply when the ECU is tested.
Fig. 3 is a schematic diagram of a circuit connection of a power switch circuit provided in an embodiment of the present invention, as shown in fig. 3, the power switch circuit includes: a power switch 100, a bias resistor Rx and an auxiliary bleeding circuit 200.
A first end of the power switch 100 is connected to the power supply VBAT, a second end of the power switch 100 is respectively connected to a first end of the bias resistor Rx and a first end of the auxiliary bleeding circuit 200, and a third end of the power switch 100 is respectively connected to a second end of the auxiliary bleeding circuit 200 and a power supply end of the electronic control unit 300; the second terminal of the bias resistor Rx and the third terminal of the auxiliary bleeding circuit 200 are connected to the ground terminal.
The bias resistor Rx is used to provide a bias voltage for the power switch 100.
The power switch 100 is turned on when the power supply VBAT is positive voltage, so that the power supply VBAT supplies power to the electronic control unit 300.
The auxiliary bleeding circuit 200 is configured to be turned off when the power supply VBAT is a positive voltage, and turned on when the power supply VBAT is a negative voltage, and a resistance between the first terminal and the third terminal of the auxiliary bleeding circuit 200 is smaller than a resistance of the bias resistor Rx when the auxiliary bleeding circuit is turned on.
Generally, the power switch circuit of the electronic control unit 300 only includes the power switch 100 and the bias resistor Rx, the second terminal of the bias resistor Rx is connected to the ground terminal, and when the power supply VBAT is positive voltage, the power switch 100 can be turned on, so that the power supply VBAT can supply power to the electronic control unit 300 (including the voltage stabilizing capacitor Cx and the in-board electrical device 301); when the power supply VBAT is a negative voltage, the voltage between the third terminal and the second terminal of the power switch 100 cannot timely drop below the on-voltage due to the fact that the equivalent capacitor of the control terminal of the power switch 100 stores electric energy, and therefore the power switch 100 cannot be turned off in time, so that the discharging time of the equivalent capacitor of the control terminal affects the turn-off speed of the power switch 100.
In the case that the auxiliary bleeding circuit 200 is not provided, the control terminal equivalent capacitor of the power switch 100 can only discharge through the bias resistor Rx, generally, in order to prevent the power switch 100 from being damaged and reduce the quiescent current of the circuit, the bias resistor Rx is usually used in combination with the zener diode, and the resistance value is selected to be larger, for example, M Ω level, so that it can be seen that the control terminal equivalent capacitor has a smaller discharge current, which results in a longer discharge time.
The embodiment of the utility model provides a for solve the slow technical problem of control end equivalent capacitance discharge speed of switch 100, add supplementary bleeder circuit 200 in the switch circuit, can know through the description in the foregoing, under power supply VBAT is the condition of positive voltage, supplementary bleeder circuit 200 is in the off-state, promptly, supplementary bleeder circuit 200 does not produce the partial pressure this moment, does not produce the influence to the supply voltage of electronic control unit 300.
When the power supply VBAT is a negative voltage, the auxiliary bleeding circuit 200 is turned on, and a resistance between the first end and the third end of the auxiliary bleeding circuit is smaller than a resistance of the bias resistor Rx, and if the resistance of the bias resistor Rx is in a level of M Ω, the turn-on resistance between the first end and the third end of the auxiliary bleeding circuit 200 may be in a level of K Ω. Obviously, the equivalent capacitance of the control end of the power switch 100 will discharge rapidly through the auxiliary bleeding circuit 200 with smaller resistance, and since the resistance is smaller, the discharge current is larger, the discharge time is relatively shorter, and further the turn-off time of the power switch 100 is shortened, the faster the power switch 100 is turned off, the less the discharge amount of the voltage stabilizing capacitance Cx inside the electronic control unit 300 to the outside is, and the problems of power failure or reset of the ECU are avoided.
The utility model provides a power switch circuit, include: a power switch 100, a bias resistor Rx and an auxiliary bleeding circuit 200; a first end of the power switch 100 is connected to the power supply VBAT, a second end of the power switch 100 is respectively connected to a first end of the bias resistor Rx and a first end of the auxiliary bleeding circuit 200, and a third end of the power switch 100 is respectively connected to a second end of the auxiliary bleeding circuit 200 and a power supply end of the electronic control unit 300; the second end of the bias resistor Rx and the third end of the auxiliary bleeding circuit 200 are connected to the ground terminal; the bias resistor Rx is used to provide a bias voltage for the power switch 100; the power switch 100 is turned on when the power supply VBAT is a positive voltage, so that the power supply VBAT supplies power to the electronic control unit 300; the auxiliary bleeding circuit 200 is configured to be turned off when the power supply VBAT is a positive voltage, and turned on when the power supply VBAT is a negative voltage, and a resistance between the first terminal and the third terminal of the auxiliary bleeding circuit 200 is smaller than a resistance of the bias resistor Rx when the auxiliary bleeding circuit is turned on.
Use the utility model provides a power switch circuit, when negative voltage appears in the power supply end of electronic control unit 300, power switch 100's control end equivalent capacitance will carry out quick discharge through the less supplementary bleeder circuit 200 of resistance, compare with the power switch circuit that does not set up supplementary bleeder circuit 200, can shorten switch 100's turn-off time effectively, and then prevent that electronic control unit 300 inside steady voltage electric capacity Cx is because it is too much to discharge in the twinkling of an eye externally, lead to electronic control unit 300 unusual technical problem of work.
The basic structure of the power switch circuit provided by the embodiments of the present invention is briefly described above, and some optional implementations of the circuit are specifically described below.
In an alternative embodiment, as shown in fig. 4, the power switch 100 includes: a P-channel MOSFET (Q1 in fig. 4).
Specifically, if the power switch 100 employs a P-channel MOSFET (hereinafter referred to as PMOS), the drain of the PMOS is connected to the first terminal of the power switch 100, the gate of the PMOS is connected to the second terminal of the power switch 100, and the source of the PMOS is connected to the third terminal of the power switch 100.
Under the condition that the power supply VBAT is a positive voltage, the auxiliary bleeding circuit 200 is in an off state, the drain of the PMOS first transmits a voltage to the source through the body diode so that the source is a positive voltage, the gate is connected to the ground terminal through the bias resistor Rx, the gate is in a low level state, at this time, Vgs meets the conduction condition of the PMOS, and the PMOS is turned on, so that the power supply VBAT supplies power to the electronic control unit 300.
When the supply voltage VBAT is a negative voltage, the PMOS cannot be turned off immediately due to the energy storage effect of the GS equivalent capacitor, and at this time, the GS equivalent capacitor is discharged quickly through the auxiliary bleeding circuit 200, and when the voltage of the equivalent capacitor drops below the on-voltage, the PMOS is turned off.
In an alternative embodiment, as shown in fig. 5, the power switching circuit further includes: a clamp circuit 400.
The first terminal of the clamp circuit 400 is connected to the second terminal of the power switch 100, and the second terminal of the clamp circuit 400 is connected to the third terminal of the power switch 100.
The clamp circuit 400 is used to prevent the voltage between the third terminal and the second terminal of the power switch 100 from exceeding a preset threshold.
Specifically, when voltage stabilizing capacitor Cx inside electronic control unit 300 discharges through switch 100 and auxiliary bleeder circuit 200, in order to avoid the situation that switch 100 damages because reverse voltage is too big to appear, consequently, the embodiment of the utility model provides a still connect in parallel and set up clamp circuit 400 between switch 100's second end and third end, this clamp circuit 400 is used for the voltage restriction between switch 100's third end and the second end within presetting the threshold, and then ensures switch 100's product safety. The embodiment of the utility model provides a not specifically prescribe a limit to the form of clamp circuit 400, the user can select according to actual need.
Alternatively, as shown in fig. 6, the clamp circuit 400 includes: a zener diode Z1. In this embodiment, the anode of the zener diode Z1 is connected to the first terminal of the clamping circuit 400, and the cathode of the zener diode Z1 is connected to the second terminal of the clamping circuit 400, so that the maximum voltage between the third terminal and the second terminal of the power switch 100 is the breakdown voltage of the zener diode Z1, thereby achieving the purpose of voltage stabilization. The user may select the model of zener diode Z1 based on the particular model of power switch 100 or the actual circuit requirements.
In an alternative embodiment, as shown in fig. 5, the power switching circuit further includes: a filter circuit 500.
The first terminal of the filter circuit 500 is connected to the power supply VBAT and the first terminal of the power switch 100, respectively, and the second terminal of the filter circuit 500 is connected to the ground terminal.
Specifically, for promoting the power supply quality of electronic control unit 300, the embodiment of the utility model provides an add filter circuit 500 at switch 100's front end for filter power supply VBAT. Optionally, the filter circuit 500 includes: first electric capacity C1, that is, the one end of first electric capacity C1 is connected with power supply VBAT, and the other end is connected with the earthing terminal, and the specific appearance value of first electric capacity C1 needs to set up according to actual need, the embodiment of the utility model provides a do not carry out concrete limit to it.
In an alternative embodiment, as shown in fig. 5, the power switching circuit further includes: the first diode D1.
An anode of the first diode D1 is connected to the first terminal of the power switch 100, and a cathode of the first diode D1 is connected to the third terminal of the power switch 100.
As can be seen from the above description, when the power supply VBAT is a positive voltage, the power switch 100 is turned on to supply power to the electronic control unit 300, and at the moment of power-on, the voltage-stabilizing capacitor Cx in the electronic control unit 300 is immediately charged, at this time, a large current is generated in the circuit, and if the power switch 100 is a PMOS, since the current-carrying capacity of the body diode is weak and is easily damaged under a large current condition, in order to protect the power switch 100, the first diode D1 is connected in parallel to the power switch 100, and the diode has a characteristic of strong current-carrying capacity, so that the current-carrying pressure of the power switch 100 can be relieved, and a protection effect is achieved.
In an alternative embodiment, as shown in fig. 6, the auxiliary bleeding circuit 200 includes: a bleeder resistor Rp, a current limiting resistor Rq and a switching tube Q2.
A first end of the bleeder resistor Rp is connected to the first end of the auxiliary bleeder circuit 200, and a second end of the bleeder resistor Rp is connected to the first end of the switching tube Q2.
A second terminal of the switching tube Q2 is connected to a first terminal of a current limiting resistor Rq, and a second terminal of the current limiting resistor Rq is connected to a second terminal of the auxiliary bleeding circuit 200.
The third terminal of the switching tube Q2 is connected to the third terminal of the auxiliary bleeding circuit 200.
If the auxiliary bleeder circuit 200 is composed of the bleeder resistor Rp, the current-limiting resistor Rq, and the switching tube Q2, it can be known from the circuit connection relationship that, when the supply voltage is a positive voltage, the switching tube Q2 is in an off state; when the supply voltage is a negative voltage, the switching tube Q2 is in a conducting state, and the resistance of the switching tube Q2 in the conducting state is negligible (due to a large magnitude difference) relative to the resistance of the bleeder resistor Rp, so the resistance between the first end and the third end of the auxiliary bleeder circuit 200 is the resistance of the bleeder resistor Rp.
Optionally, the switching tube Q2 includes: and a PNP type triode (hereinafter referred to as PNP), wherein a collector of the PNP is connected to the first terminal of the switching tube Q2, a base of the PNP is connected to the second terminal of the switching tube Q2, and an emitter of the PNP is connected to the third terminal of the switching tube Q2. Under the condition that the power supply voltage is positive voltage, the collector and the emitter of the PNP are both connected to GND and are low level, so that the PNP cannot be conducted; under the condition that the power supply voltage is a negative voltage, Vbe of the PNP is less than 0, Vbc of the PNP is less than 0, the conduction condition is met, the PNP is conducted, at the moment, the equivalent capacitor of the control end of the power switch 100 discharges rapidly through the bleeder resistor Rp, the turn-off speed of the power switch 100 is accelerated, and the turn-off time of the power switch is close to the turn-off time of the diode.
In conclusion, utilize the embodiment of the utility model provides a power switch circuit can be in the twinkling of an eye at the power disconnection for switch 100's turn-off speed to cushion and protect the power to electronic control unit 300, prevent that electronic control unit 300 inside voltage stabilizing capacitance Cx from leading to the unusual technical problem of electronic control unit 300 work owing to external discharge time overlength.
Example two
The embodiment of the utility model provides an electric automobile, this electric automobile include any kind of switch circuit in the above-mentioned embodiment one.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A power switching circuit, comprising: the power switch, the bias resistor and the auxiliary bleeder circuit;
the first end of the power switch is connected with a power supply, the second end of the power switch is respectively connected with the first end of the bias resistor and the first end of the auxiliary bleeder circuit, and the third end of the power switch is respectively connected with the second end of the auxiliary bleeder circuit and the power supply end of the electronic control unit; the second end of the bias resistor and the third end of the auxiliary bleeder circuit are connected with a ground terminal;
the bias resistor is used for providing bias voltage for the power switch;
the power switch is used for being conducted under the condition that the power supply is in a positive voltage, so that the power supply supplies power to the electronic control unit;
the auxiliary bleeder circuit is used for being switched off under the condition that the power supply is positive voltage, and being switched on under the condition that the power supply is negative voltage, and under the switching-on condition, the resistance between the first end and the third end of the auxiliary bleeder circuit is smaller than the resistance of the bias resistor.
2. The power switching circuit of claim 1, further comprising: a clamp circuit;
the first end of the clamping circuit is connected with the second end of the power switch, and the second end of the clamping circuit is connected with the third end of the power switch;
the clamping circuit is used for preventing the voltage between the third end and the second end of the power switch from exceeding a preset threshold value.
3. The power switching circuit of claim 1, further comprising: a filter circuit;
the first end of the filter circuit is respectively connected with the power supply and the first end of the power switch, and the second end of the filter circuit is connected with the grounding end.
4. The power switching circuit of claim 1, further comprising: a first diode;
the anode of the first diode is connected with the first end of the power switch, and the cathode of the first diode is connected with the third end of the power switch.
5. The power switching circuit of claim 1, wherein the auxiliary bleed circuit comprises: the device comprises a bleeder resistor, a current-limiting resistor and a switching tube;
the first end of the bleeder resistor is connected with the first end of the auxiliary bleeder circuit, and the second end of the bleeder resistor is connected with the first end of the switch tube;
the second end of the switch tube is connected with the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected with the second end of the auxiliary bleeder circuit;
and the third end of the switching tube is connected with the third end of the auxiliary bleeder circuit.
6. The power switching circuit of claim 5, wherein the switching tube comprises: PNP type triode.
7. The power switching circuit of claim 1, wherein the power switch comprises: a P-channel MOSFET.
8. The power switching circuit of claim 2, wherein the clamp circuit comprises: a zener diode.
9. The power switching circuit of claim 3, wherein the filter circuit comprises: a first capacitor.
10. An electric vehicle comprising the power switching circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122498450.6U CN216016840U (en) | 2021-10-15 | 2021-10-15 | Power switch circuit and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122498450.6U CN216016840U (en) | 2021-10-15 | 2021-10-15 | Power switch circuit and electric automobile |
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| Publication Number | Publication Date |
|---|---|
| CN216016840U true CN216016840U (en) | 2022-03-11 |
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| CN202122498450.6U Active CN216016840U (en) | 2021-10-15 | 2021-10-15 | Power switch circuit and electric automobile |
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| CN (1) | CN216016840U (en) |
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- 2021-10-15 CN CN202122498450.6U patent/CN216016840U/en active Active
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