Rapid discharge switching circuit and electronic product

Abstract

The embodiment of the utility model relates to the technical field of automotive electronics, in particular to a quick discharge switching circuit and an electronic product. According to the utility model, the controller is connected with the bleeder circuit through the enable circuit, so that the bleeder circuit is controlled to quickly release residual charges. After the charge is discharged, the on-off of the discharge circuit can be controlled, so that the lower quiescent current can continuously supply power to a post-stage load; the electronic product in the permanent power supply mode has a rapid discharging function, the situation that the electronic product cannot work normally due to residual charges is avoided, and meanwhile the service life of the electronic product is prolonged.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of automobile electronics, and in particular to a fast discharge switch circuit and an electronic product. Background Art

[0002] There are many scenarios in which the circuit is closed quickly in automotive electronic products. When the circuit is closed quickly, the downstream load often has residual charge that needs to be discharged. The existing solution is to add a ground resistor in the loop to discharge the load during the charge process. Figure 1 One end of the ground resistor is connected to the power supply circuit, and the other end of the ground resistor is grounded. However, since the ground resistor consumes current when it is dormant in the circuit, electronic products with high requirements for static current cannot be powered permanently.

[0003] Therefore, existing permanently powered electronic products do not have the function of quickly discharging residual charge, which causes the power timing of subsequent electronic products to be prone to errors when the circuit is quickly opened and closed, which not only affects the normal use of the electronic products, but also reduces the service life of the electronic products. Utility Model Content

[0004] In view of the above problems, the embodiments of the present utility model provide a fast discharge switch circuit and an electronic product, which solve the problem that the existing electronic products in permanent power supply mode do not have the function of quickly discharging the residual charge.

[0005] According to one aspect of the embodiments of the present utility model, a fast discharge switch circuit is provided, the circuit comprising a switch control circuit, an enabling circuit, and a discharge circuit; wherein:

[0006] The switch control circuit is connected to a power supply loop between a power supply and a subsequent load, and an enable end of the switch control circuit is connected to a controller through an enable circuit; an enable end of the discharge circuit is connected to the enable circuit, and two connection ends of the discharge circuit are respectively connected to an output end of the switch control circuit and a power ground, for discharging the subsequent load.

[0007] In an optional manner, the switch control circuit includes a first MOS tube, a gate of the first MOS tube is connected to the enabling circuit, a source is connected to the power supply, and a drain is connected to the discharge circuit and a subsequent load.

[0008] In an optional manner, the enabling circuit includes a first enabling circuit and a second enabling circuit, and the second enabling circuit is connected to the switch control circuit; the enabling end of the first enabling circuit is connected to a controller, and the other end of the first enabling circuit is connected to the second enabling circuit, and the on and off of the switch control circuit is controlled by the second enabling circuit.

[0009] In an optional manner, the first enabling circuit includes a first transistor, a base of the first transistor is connected to the control terminal of the controller, and a collector is connected to the second enabling circuit via a second resistor.

[0010] In an optional manner, the signal output by the control end of the controller is a low-level signal, a floating signal, or a high-level signal.

[0011] In an optional manner, the second enabling circuit includes a second transistor, the base of the second transistor is connected to the first enabling circuit, the emitter is connected to the power supply, and the collector is connected to the gate of the first MOS tube and the discharge circuit; the base of the second transistor is connected to the emitter of the second transistor through a second resistor.

[0012] In an optional manner, the discharge circuit includes a discharge resistor and a third transistor, one end of the discharge resistor is connected to the output end of the first MOS tube, and the other end of the discharge resistor is connected to the collector of the third transistor; the base of the third transistor is connected to the collector of the second transistor, and the emitter is grounded.

[0013] In an optional manner, the collector of the second transistor is also connected to a current limiting filter circuit, which includes a first capacitor and a third resistor connected in parallel to the collector of the second transistor, and the other ends of the first capacitor and the third resistor are grounded.

[0014] In an optional manner, the power supply is a permanent power supply.

[0015] According to another aspect of the embodiment of the utility model, an electronic product is provided, comprising the above-mentioned fast discharge switch circuit.

[0016] In the embodiment of the utility model, a switch control circuit is provided, and a discharge circuit is provided in the power supply circuit between the output end of the switch control circuit and the subsequent load, and the enable end of the discharge circuit is connected to the controller through the enable circuit, and the discharge circuit is controlled to quickly discharge the residual charge on the subsequent load to the power ground by receiving the level signal of the controller. The controller of this scheme is connected to the discharge circuit through the enable circuit, so as to control the discharge circuit to quickly release the residual charge. And after the charge is discharged, the on and off of the discharge circuit can be controlled, so that a lower static current can continuously supply power to the subsequent load; the electronic product with permanent power supply mode has a fast discharge function, which avoids the electronic product from being unable to work normally due to the residual charge, and at the same time improves the service life of the electronic product.

[0017] The above description is only an overview of the technical solution of the embodiment of the utility model. In order to more clearly understand the technical means of the embodiment of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are only used to illustrate the embodiments and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0019] Figure 1 It shows a structural block diagram of the prior art permanent power supply provided by the utility model;

[0020] Figure 2 A structural block diagram of a fast discharge switch circuit provided by the utility model is shown;

[0021] Figure 3 A circuit schematic diagram of a fast discharge switch circuit provided by the utility model is shown;

[0022] Among them, VCC, power supply, 101, post-stage load, 203, controller, 204, switch control circuit, 205, enable circuit, 206, discharge circuit, Q1, first transistor, Q2, second transistor, Q3, third transistor, Q4, first MOS tube, R1, first resistor, R2, second resistor, R3, third resistor, R4, discharge resistor, C1, first capacitor, Switch_input, control end of the controller. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein.

[0024] Embodiment 1,

[0025] Figure 2The first specific embodiment of a fast discharge switch circuit of the utility model is shown, a fast discharge switch circuit, characterized in that the circuit includes a switch control circuit 204, an enable circuit 205, and a discharge circuit 206; wherein the switch control circuit 204 is connected to the power supply circuit between the power supply VCC and the subsequent load 101, and the enable end of the switch control circuit is connected to the controller 203 through the enable circuit 205; the enable end of the discharge circuit 206 is connected to the enable circuit 205, and the two connection ends of the discharge circuit 206 are respectively connected to the output end of the switch control circuit 204 and the power ground, for discharging the subsequent load 101. In this embodiment, the switch control circuit 204 is connected to the power supply circuit of the power supply VCC and the subsequent load 101, and the power supply VCC can be a permanent power supply to provide a power supply that does not power off for the subsequent load 101. The subsequent load 101 may be an in-vehicle electronic product, such as an in-vehicle central control system, a display screen, a door module, an audio module, etc. The input end of the switch control circuit 204 of the present application is connected to the power supply VCC, the output end of the switch control circuit 204 is connected to the subsequent load 101, and the enable end of the switch control circuit 204 is connected to the controller 203; the switch module may receive a level signal from the controller 203 to implement power-off management for the subsequent load 101. At the same time, the present application further provides a discharge circuit 206 between the output end of the switch control circuit 204 and the subsequent load 101; the discharge circuit 206 is provided with an enable end, an input end, and an output end, the enable end of the discharge circuit 206 is connected to the enable circuit 205, the input end of the discharge circuit 206 is connected to the output end of the switch control circuit 204 and the power end of the subsequent load 101, and the output end of the discharge circuit 206 is connected to the power ground, which is used to discharge the subsequent load 101. Among them, the controller 203 can be a vehicle system controller 203 or a signal receiver, which is used to receive vehicle signals or external signals and control the on and off of the switch control circuit 204. In the embodiment of the utility model, by setting the switch control circuit 204, and setting the discharge circuit 206 in the power supply circuit between the output end of the switch control circuit 204 and the subsequent load 101, and the enable end of the discharge circuit 206 is connected to the controller 203 through the enable circuit 205, by receiving the level signal of the controller 203, the discharge circuit 206 is controlled to quickly discharge the residual charge on the subsequent load 101 to the power ground, so that the electronic products in the permanent power supply mode have a fast discharge function, avoid the electronic products from being unable to work normally due to the residual charge, and at the same time improve the service life of the electronic products.

[0026] Embodiment 2,

[0027] Figure 3The second specific embodiment of a fast discharge switch circuit of the utility model is shown. Based on embodiment 1, the present application further defines a fast discharge switch circuit. Specifically, the switch control circuit 204 includes a first MOS tube Q4, the gate of the first MOS tube Q4 is connected to the enable circuit 205, the source is connected to the power supply VCC, and the drain is connected to the discharge circuit 206 and the subsequent load 101; the enable circuit 205 includes a first enable circuit 205 and a second enable circuit 205, and the second enable circuit 205 is connected to the switch control circuit 204; the enable end of the first enable circuit 205 is connected to the controller 203, and the other end of the first enable circuit 205 is connected to the second enable circuit 205, and the switch control circuit 204 is controlled by the second enable circuit 205. The first enable circuit 205 includes a first transistor Q1, the base of the first transistor Q1 is connected to the control end Switch_input of the controller 203, and the collector is connected to the second enable circuit 205 through the second resistor R2. The signal output by the control terminal Switch_input of the controller 203 is a low-level signal or a suspended signal or a high-level signal. The second enabling circuit 205 includes a second triode Q2, the base of the second triode Q2 is connected to the first enabling circuit, the emitter is connected to the power supply VCC, and the collector is connected to the gate of the first MOS tube Q4 and the discharge circuit 206; the base of the second triode Q2 is connected to the emitter of the second triode Q2 through the second resistor R2. The collector of the second triode Q2 is also connected to a current limiting filter circuit, and the current limiting filter circuit includes a first capacitor C1 and a third resistor R3 connected in parallel to the collector of the second triode Q2, and the other ends of the first capacitor C1 and the third resistor R3 are grounded. In this embodiment, the present application controls the first MOS tube Q4 by setting the first triode Q1 and the second triode Q2. Specifically, the control terminal Switch_input of the controller 203 is generally controlled by a single-chip microcomputer to control the on and off of the switch module. The first MOS tube Q4 is a PMOS field effect tube, the first transistor Q1 is an NPN transistor, the second transistor Q2 is a PNP transistor, the first resistor R1, the second resistor R2, and the third resistor R3 are current limiting resistors, and the first capacitor C1 is a filter capacitor. Receiving the control signal, there are two working states: 1. The control signal of the controller 203 is low or suspended: at this time, the subsequent load 101 is in a power supply state. The first transistor Q1 is turned off, the second transistor Q2 is turned off, the first MOS tube Q4 is turned on, and the power supply VCC supplies power to the subsequent load 101 through the switch control circuit 204. 2. The control signal is high: at this time, the subsequent load 101 is in a reset state. The first transistor Q1 is turned on, the second transistor Q2 is turned on, the first MOS tube Q4 is turned off, and the power supply VCC stops supplying power to the subsequent load 101.

[0028] Embodiment 3,

[0029] Figure 3 The second specific embodiment of a fast discharge switch circuit of the utility model is shown. Based on the embodiment 2, the present application further defines the discharge circuit 206. The discharge circuit 206 includes a discharge resistor R4 and a third transistor Q3. One end of the discharge resistor R4 is connected to the output end of the first MOS transistor Q4, and the other end of the discharge resistor R4 is connected to the collector of the third transistor Q3. The base of the third transistor Q3 is connected to the collector of the second transistor Q2, and the emitter is grounded. The discharge circuit 206 is provided with an enable terminal, an input terminal, and an output terminal. The enable terminal is the base of the third triode Q3, the input terminal is one end of the discharge resistor R4 connected to the output terminal of the first MOS tube Q4, and the output terminal is the emitter of the third triode Q3. The enable terminal of the discharge circuit 206 is connected to the enable circuit 205, the input terminal of the discharge circuit 206 is connected to the output terminal of the switch control circuit 204 and the power terminal of the subsequent load 101, and the output terminal of the discharge circuit 206 is connected to the power ground for discharging the subsequent load 101. In this embodiment, the control terminal Switch_input of the controller 203 is generally controlled by a single-chip microcomputer to control the on and off of the switch module. The first MOS transistor Q4 is a PMOS field effect transistor, the first transistor Q1 is an NPN transistor, the second transistor Q2 is a PNP transistor, the third transistor Q3 is an NPN transistor, the first resistor R1, the second resistor R2, and the third resistor R3 are current limiting resistors, the first capacitor C1 is a filter capacitor, and the discharge resistor R4 is a ground discharge resistor R4. There are two working states when receiving the control signal: 1. The control signal of the controller 203 is low or suspended: at this time, the subsequent load 101 is in a power supply state. The first transistor Q1 is turned off, the second transistor Q2 is turned off, the third transistor Q3 is turned off, the first MOS transistor Q4 is turned on, and the power supply VCC supplies power to the subsequent load 101 through the switch control circuit 204. At this time, since the third transistor Q3 is turned off, the discharge resistor R4 is in a suspended state, does not consume current, and has the effect of low static current. 2. The control signal is high: at this time, the subsequent load 101 is in a reset state. The first transistor Q1 is turned on, the second transistor Q2 is turned on, the third transistor Q3 is turned on, the first MOS transistor Q4 is turned off, and the power supply VCC stops supplying power to the subsequent load 101. At this time, since the third transistor Q3 is turned on, the discharge resistor R4 is in a grounded state, and the remaining charge on the subsequent load 101 can be quickly discharged to the ground terminal to avoid the residual charge causing the power timing error of the subsequent load 101 when the power supply state is quickly restored.

[0030] Embodiment 4,

[0031] According to another aspect of the embodiment of the utility model, an electronic product is provided, including the above-mentioned fast discharge switch circuit. The control terminal Switch_input of the controller 203 is generally controlled by a single-chip microcomputer and is used to control the on and off of the switch module. The first MOS tube Q4 is a PMOS field effect tube, the first transistor Q1 is an NPN transistor, the second transistor Q2 is a PNP transistor, the third transistor Q3 is an NPN transistor, the first resistor R1, the second resistor R2, and the third resistor R3 are current limiting resistors, the first capacitor C1 is a filter capacitor, and the discharge resistor R4 is a ground discharge resistor R4. Receiving a control signal, there are two working states: 1. The control signal of the controller 203 is low or suspended: at this time, the subsequent load 101 is in a power supply state. The first transistor Q1 is turned off, the second transistor Q2 is turned off, the third transistor Q3 is turned off, the first MOS tube Q4 is turned on, and the power supply VCC supplies power to the subsequent load 101 through the switch control circuit 204. At this time, since the third transistor Q3 is turned off, the discharge resistor R4 is in a suspended state, does not consume current, and has the effect of low static current. 2. The control signal is at a high level: At this time, the subsequent load 101 is in a reset state. The first transistor Q1 is turned on, the second transistor Q2 is turned on, the third transistor Q3 is turned on, the first MOS tube Q4 is turned off, and the power supply VCC stops supplying power to the subsequent load 101. At this time, since the third transistor Q3 is turned on, the discharge resistor R4 is in a grounded state, and the residual charge on the subsequent load 101 can be quickly discharged to the ground terminal to avoid the residual charge causing the power timing of the subsequent load 101 to be wrong when the power supply state is quickly restored. By setting a switch control circuit 204, and setting a discharge circuit 206 in the power supply circuit between the output end of the switch control circuit 204 and the subsequent load 101, and the enable end of the discharge circuit 206 is connected to the controller 203 through the enable circuit 205, by receiving the level signal of the controller 203, the discharge circuit 206 is controlled to quickly discharge the residual charge on the subsequent load 101 to the power ground, so as to avoid the residual charge causing the power timing error of the subsequent load 101 when the power supply state is quickly restored.

[0032] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system or other device. In addition, the embodiments of the present utility model are not directed to any particular programming language.

[0033] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. Similarly, in order to simplify the present invention and help understand one or more of the various aspects of the present invention, in the above description of the exemplary embodiments of the present invention, the various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. Among them, the claims that follow the specific embodiments are hereby expressly incorporated into the specific embodiments, wherein each claim itself serves as a separate embodiment of the present invention.

[0034] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and further may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive.

[0035] It should be noted that the above embodiments illustrate the utility model rather than limit the utility model, and those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation on the claims. The word "comprising" does not exclude the existence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the existence of multiple such elements. The utility model can be implemented by means of hardware including several different elements and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words can be interpreted as names. The steps in the above embodiments should not be understood as limitations on the order of execution unless otherwise specified.

Claims

1. A fast discharge switch circuit, characterized in that: The circuit comprises a switch control circuit (204), an enabling circuit (205), and a discharge circuit (206); wherein: The switch control circuit (204) is connected to a power supply loop between a power supply and a subsequent load (101), and an enable end of the switch control circuit (204) is connected to a controller (203) via an enable circuit (205); an enable end of the discharge circuit (206) is connected to the enable circuit (205), and two connection ends of the discharge circuit (206) are respectively connected to an output end of the switch control circuit (204) and a power ground, for discharging the subsequent load (101).

2. A fast discharge switch circuit according to claim 1, characterized in that: The switch control circuit (204) comprises a first MOS transistor (Q4), the gate of the first MOS transistor (Q4) being connected to the enabling circuit (205), the source being connected to the power supply, and the drain being connected to the discharge circuit (206) and the subsequent load (101).

3. A fast discharge switch circuit according to claim 2, characterized in that: The enabling circuit (205) comprises a first enabling circuit (205) and a second enabling circuit (205), wherein the second enabling circuit (205) is connected to the switch control circuit (204); an enabling end of the first enabling circuit (205) is connected to a controller (203), and the other end of the first enabling circuit (205) is connected to the second enabling circuit (205), and the on and off of the switch control circuit (204) is controlled by the second enabling circuit (205).

4. A fast discharge switch circuit according to claim 3, characterized in that: The first enabling circuit (205) comprises a first transistor (Q1), the base of the first transistor (Q1) is connected to the control end of the controller (203), and the collector is connected to the second enabling circuit (205) via a second resistor (R2).

5. A fast discharge switch circuit according to claim 4, characterized in that: The signal outputted by the control end of the controller (203) is a low-level signal, a suspended signal or a high-level signal.

6. A fast discharge switch circuit according to claim 4, characterized in that: The second enabling circuit (205) comprises a second triode (Q2), the base of the second triode (Q2) being connected to the first enabling circuit, the emitter being connected to the power supply, and the collector being connected to the gate of the first MOS tube (Q4) and the discharge circuit (206); the base of the second triode (Q2) being connected to the emitter of the second triode (Q2) via a second resistor (R2).

7. A fast discharge switch circuit according to claim 6, characterized in that: The discharge circuit (206) comprises a discharge resistor (R4) and a third triode (Q3); one end of the discharge resistor (R4) is connected to the output end of the first MOS tube (Q4), and the other end of the discharge resistor (R4) is connected to the collector of the third triode (Q3); the base of the third triode (Q3) is connected to the collector of the second triode (Q2), and the emitter is grounded.

8. A fast discharge switch circuit according to claim 6, characterized in that: The collector of the second transistor (Q2) is also connected to a current limiting filter circuit, which comprises a first capacitor (C1) and a third resistor (R3) connected in parallel to the collector of the second transistor (Q2), and the other ends of the first capacitor (C1) and the third resistor (R3) are grounded.

9. A fast discharge switch circuit according to claim 1, characterized in that: The power supply is a permanent power supply.

10. An electronic product, characterized in that: A fast discharge switch circuit comprising any one of claims 1-9.

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