Power supply control circuit and electronic equipment

Abstract

The utility model discloses a power supply control circuit and electronic equipment. The power supply control circuit comprises an anti-toppling switch, an electronic switch circuit and an anti-interference circuit, the electronic switch circuit is connected with the anti-toppling switch and the anti-interference circuit, the electronic switch circuit is used for controlling on-off of a power supply, and when slight vibration occurs, the anti-toppling switch recovers after being temporarily switched off at the moment, and the anti-toppling switch is switched off. Interference signals generated during disconnection are shielded through the anti-interference circuit, so that the situation that the electronic switching circuit responds to the interference signals to control disconnection of the power supply by mistake due to the fact that the interference signals interfere the electronic switching circuit is prevented, and normal power supply of the power supply and normal use of electronic equipment are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of electronic circuits, in particular to a power supply control circuit and electronic equipment. Background Art

[0002] Most common anti-dump switches on the market are mechanical switches, which are easily disturbed by slight vibrations and have poor stability.

[0003] The patent with announcement number CN215644292U discloses an anti-dump switch and electronic equipment. When the anti-dump switch tilts, the effective magnetic permeability of the magnetic fluid changes based on the change of the magnetic fluid between the two electromagnetic coils inside it, causing the magnetic field between the two electromagnetic coils to change. The controller detects the change of the electrical signal caused by the change of the magnetic field, thereby disconnecting the power supply of the device. However, when the device experiences slight vibrations that do not affect safety, the magnetic field will change, and the change of the electrical signal generated at this time is actually equivalent to an interference signal. Based on the influence of the interference signal, the controller will disconnect the power supply of the device, causing an erroneous disconnection, affecting the normal power supply and normal use of the device. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model provides a power control circuit and an electronic device.

[0005] The utility model is realized by the following technical solutions:

[0006] In a first aspect, a power control circuit comprises:

[0007] Anti-dump switch;

[0008] An electronic switch circuit, connected to the anti-dump switch and used to connect to a power supply to control the on and off of the power supply;

[0009] The anti-interference circuit is connected to the electronic switch circuit and is used to shield the interference signal of the anti-dumping switch to the electronic switch circuit.

[0010] The power control circuit of the utility model is provided with an anti-dump switch, an electronic switch circuit and an anti-interference circuit. The electronic switch circuit is connected to the anti-dump switch and the anti-interference circuit. The electronic switch circuit is used to control the on and off of the power supply. When slight vibration occurs, the anti-dump switch is briefly disconnected and then restored. The interference signal generated during the disconnection is shielded by the anti-interference circuit, thereby preventing the interference signal from interfering with the electronic switch circuit, causing the electronic switch circuit to respond to the interference signal to control the disconnection of the power supply by mistake, thereby ensuring the normal power supply of the power supply.

[0011] In one implementation of the above technical solution, the anti-dump switch includes a signal terminal and a ground terminal, the signal terminal is connected to the electronic switch circuit, and the ground terminal is grounded.

[0012] The signal terminal is used to connect the electronic switch circuit and the ground terminal is grounded to ensure the normal use of the anti-dump switch.

[0013] In one implementation of the above technical solution, the electronic switching circuit includes a power input circuit and a first switching circuit, the first switching circuit includes a first transistor and a first resistor; the emitter of the first transistor is connected to the power input circuit, the base of the first transistor and one end of the first resistor, the other end of the first resistor is connected to the anti-dump switch and the anti-interference circuit, and the collector of the first transistor is used to connect to the power supply.

[0014] The use of the power input circuit and the first switch circuit is conducive to ensuring the normal operation of the first switch circuit, and the use of the first transistor and the first resistor is conducive to adding controllable current on-off on the basis of the anti-dump switch.

[0015] In one implementation of the above technical solution, the anti-interference circuit includes a first capacitor, one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is grounded.

[0016] When an interference signal is generated by the first capacitor, the interference signal is shielded by charging the first capacitor, thereby avoiding erroneous triggering of the first switch circuit to disconnect the power supply.

[0017] In one implementation of the above technical solution, the first switch circuit further includes a second resistor, one end of the second resistor is connected to the emitter of the first transistor, and the other end of the second resistor is connected to the base of the first transistor.

[0018] Using the second resistor is beneficial to improving the stability of the first transistor.

[0019] In one implementation of the above technical solution, the first switch circuit further includes a first diode, the anode of the first diode is connected to the other end of the first resistor, and the cathode of the first diode is connected to the anti-dumping switch.

[0020] The use of a diode is beneficial to improving the control stability of the first switch circuit.

[0021] In one implementation of the above technical solution, the electronic switching circuit also includes a second switching circuit, which includes a second transistor, a third resistor and a fourth resistor; the base of the second transistor is connected to one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected to the anti-interference circuit and the cathode of the first diode, the other end of the fourth resistor is connected to the emitter of the second transistor and the collector of the first transistor, and the collector of the second transistor is used to connect to the power supply.

[0022] The second switch circuit is combined with the first switch circuit to provide dual-path power supply control. Even if the first switch circuit fails, the on-off control of the power supply can be guaranteed. The introduction of the third resistor, the second transistor, and the fourth resistor is beneficial to increase the controllable current size on the basis of the anti-dump switch while maintaining the stability of the second transistor.

[0023] In one implementation of the above technical solution, the anti-interference circuit includes a second capacitor, one end of the second capacitor is connected to the other end of the third resistor, and the other end of the second capacitor is grounded.

[0024] When an interference signal is generated by the second capacitor, the interference signal is shielded by charging the second capacitor, thereby avoiding erroneous triggering of the second switch circuit to disconnect the power supply.

[0025] In one implementation of the above technical solution, the second switch circuit further includes a second diode, the anode of the second diode is connected to the other end of the third resistor, and the cathode of the second diode is connected to the cathode of the first diode.

[0026] The first switch circuit and the second switch circuit are isolated by using the second diode and the first diode, so that the second switch circuit and the first switch circuit work independently without affecting each other.

[0027] In a second aspect, an electronic device comprises: a power control circuit as described in any one of the above items.

[0028] The electronic device of the utility model is provided with an anti-dumping switch, an electronic switch circuit and an anti-interference circuit. The electronic switch circuit is connected to the anti-dumping switch and the anti-interference circuit. The electronic switch circuit is used to control the on and off of the power supply. When slight vibration occurs, the anti-dumping switch is briefly disconnected and then restored. The interference signal generated during the disconnection is shielded by the anti-interference circuit, thereby preventing the interference signal from interfering with the electronic switch circuit, causing the electronic switch circuit to respond to the interference signal to control the disconnection of the power supply by mistake, thereby ensuring the normal power supply of the power supply and the normal use of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a block diagram of the power supply control circuit of the utility model.

[0030] Figure 2 It is a circuit structure schematic diagram of the power supply control circuit of the utility model.

[0031] Figure 3 It is a block diagram of an electronic device. DETAILED DESCRIPTION

[0032] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0033] In the related art, anti-dump switches are mostly mechanical switches, which are easily disturbed by slight vibrations and are controlled by only a single control circuit. If the only unit control circuit fails, the anti-dump switch cannot play a real protective role, eventually causing damage to the equipment.

[0034] See also Figure 1-Figure 2 . Figure 1 It is a block diagram of the power supply control circuit of the utility model. Figure 2 It is a circuit structure schematic diagram of the power supply control circuit of the utility model.

[0035] In a first aspect, a power control circuit includes an anti-dumping switch 1, an electronic switch circuit 2, and an anti-interference circuit 3. The electronic switch circuit 2 is connected to the anti-dumping switch 1 and is used to connect a power supply VIN to control the on and off of the power supply VIN. The anti-interference circuit 3 is connected to the electronic switch circuit 2 and is used to shield the interference signal of the anti-dumping switch 1 to the electronic switch circuit 2.

[0036] By setting an anti-dump switch 1, an electronic switch circuit 2 and an anti-interference circuit 3, the electronic switch circuit 2 is connected to the anti-dump switch 1 and the anti-interference circuit 3, and the electronic switch circuit 2 is used to control the on and off of the power supply VIN. When a slight vibration occurs, the anti-dump switch 1 is briefly disconnected and then restored. The interference signal generated during the disconnection is shielded by the anti-interference circuit 3, thereby preventing the interference signal from interfering with the electronic switch circuit 2, causing the electronic switch circuit 2 to respond to the interference signal to control the power supply VIN to be disconnected by mistake, thereby ensuring the normal power supply of the power supply VIN.

[0037] It should be noted that, taking an electronic device including a power control circuit as an example, the power supply VIN is the power supply for the controller of the entire electronic device. For example, the power supply VIN is the power supply for the controller of the electronic device. If the power supply VIN is disconnected, the controller is powered off and stops working, causing the entire device to stop working, thereby playing a role in safety protection.

[0038] In one embodiment, the anti-dump switch 1 includes a signal terminal 11 and a ground terminal 12 , wherein the signal terminal 11 is connected to the electronic switch circuit 2 , and the ground terminal 12 is connected to a ground GND.

[0039] The utility model utilizes the signal terminal 11 to connect the electronic switch circuit 2 and the ground terminal 12 to ground, thereby ensuring the normal use of the anti-dumping switch 1.

[0040] In one implementation, the electronic switch circuit 2 includes a power input circuit 21 , a first switch circuit 22 , and a second switch circuit 23 .

[0041] Optionally, the first switch circuit 22 includes a first transistor Q1, a first resistor R1, a second resistor R2, and a first diode D1. In one embodiment, the emitter of the first transistor Q1 is connected to the power input circuit 21 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the base of the first transistor Q1 and one end of the first resistor R1, the other end of the first resistor R1 is connected to the anti-interference circuit 3 and connected to the signal end 11 of the anti-dumping switch 1 through the first diode D1, and the collector of the first transistor Q1 is used to connect to the power supply VIN. Among them, the positive electrode of the first diode D1 is connected to the other end of the first resistor R1, and the negative electrode of the first diode D1 is connected to the signal end 11 of the anti-dumping switch 1.

[0042] The utility model utilizes a power input circuit 21 and a first switch circuit 22, which is beneficial to ensuring the normal operation of the first switch circuit 22; since the anti-dumping switch 1 can pass a small current, the first transistor Q1 and the first resistor R1 are utilized, which is beneficial to adding a controllable current on-off on the basis of the anti-dumping switch 1; the second resistor R2 is utilized, which is beneficial to improving the stability of the first transistor Q1; the first diode D1 is provided to isolate the second switch circuit 23, which is beneficial to ensuring the independent operation of the first switch circuit 22 and the second switch circuit 23 without interfering with each other, thereby improving the control stability of the first switch circuit 22.

[0043] Optionally, the second switch circuit 23 includes a second triode Q2, a third resistor R3, a fourth resistor R4, and a second diode D2. In one embodiment, the base of the second triode Q2 is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the third resistor R3 is connected to the anti-interference circuit 3 and connected to the cathode of the first diode D1 through the second diode D2, the other end of the fourth resistor R4 is connected to the emitter of the second triode Q2 and the collector of the first triode Q1, and the collector of the second triode Q2 is used to connect to the power supply VIN. The anode of the second diode D2 is connected to the other end of the third resistor R3, and the cathode of the second diode D2 is connected to the cathode of the first diode D1.

[0044] The utility model utilizes the second switch circuit 23 in combination with the first switch circuit 22 to provide dual-path power supply VIN control. Even if the first switch circuit 22 fails, the on-off control of the power supply VIN can be guaranteed. Similarly, if the second switch circuit 23 fails, the on-off control of the power supply VIN can also be guaranteed by the first switch circuit 22. The dual-path control improves stability and safety. The introduction of the third resistor R3, the second transistor Q2, and the fourth resistor R4 is beneficial to increase the controllable current size on the basis of the anti-dump switch 1 while maintaining the stability of the second transistor Q2. The second diode D2 and the first diode D1 are used to isolate the first switch circuit 22 and the second switch circuit 23, so that the second switch circuit 23 and the first switch circuit 22 work independently without affecting each other.

[0045] In one embodiment, the anti-interference circuit 3 includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 is connected to the other end of the first resistor R1, and the other end of the first capacitor C1 is grounded; one end of the second capacitor C2 is connected to the other end of the third resistor R3, and the other end of the second capacitor C2 is grounded.

[0046] The utility model utilizes the first capacitor C1. When an interference signal is generated, the interference signal is shielded by charging the first capacitor C1, thereby avoiding erroneous triggering of the first switch circuit 22 to disconnect the power supply VIN; and utilizes the second capacitor C2. When an interference signal is generated, the interference signal is shielded by charging the second capacitor C2, thereby avoiding erroneous triggering of the second switch circuit 23 to disconnect the power supply VIN.

[0047] In one embodiment, the power input circuit 21 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, a fourth capacitor C4, a first electrolytic capacitor EC1 and a power chip IC, one end of the fifth resistor R5 is connected to the input power supply (12V), and the power input circuit 21 is used to provide working power for the electronic switch circuit 2.

[0048] In one implementation, the second switch circuit 23 may further include a fifth capacitor C5 and a second electrolytic capacitor EC2. One end of the fifth capacitor C5 is grounded, and the other end is connected to the power supply VIN.

[0049] In order to more clearly understand the present invention, the working principle of the power control circuit is described below. Under normal conditions, the anti-dumping switch 1 is grounded, and forms a path with the first switch circuit 22 and the second switch circuit 23 of the electronic switch circuit 2:

[0050] When slight vibration occurs, that is, when it does not actually affect safety, the anti-dump switch 1 briefly dumps and disconnects and then returns to its original state. When the anti-dump switch 1 briefly dumps and disconnects, an interference signal will be generated. At this time, the base of the first transistor Q1 charges the first capacitor C1 through the first resistor R1, thereby shielding the interference signal without turning off the first transistor Q1. At the same time, the base of the second transistor Q2 charges the second capacitor C2 through the third resistor R3, thereby shielding the interference signal without turning off the second transistor Q2. The power supply VIN remains turned on to prevent false triggering and false disconnection of the power supply VIN, thereby ensuring normal power supply of the power supply VIN.

[0051] When a non-mild vibration occurs, after the first capacitor C1 and the second capacitor C2 are charged, since the anti-dumping switch 1 is still in the dumping disconnected state, the first diode D1 and the second diode D2 are open, the base of the first transistor Q1 and the base of the second transistor Q2 cannot be turned on, the first transistor Q1 and the second transistor Q2 are turned off, and the power supply VIN connected to the collector of the first transistor Q1 and the collector of the second transistor Q2 is disconnected, thereby playing a safety protection role.

[0052] like Figure 3 As shown, in the second aspect, an electronic device includes a power control circuit. The electronic device of the utility model is provided with an anti-dump switch 1, an electronic switch circuit 2 and an anti-interference circuit 3, wherein the electronic switch circuit 2 is connected to the anti-dump switch 1 and the anti-interference circuit 3, and the electronic switch circuit 2 is used to control the on and off of the power supply VIN. When slight vibration occurs, the anti-dump switch 1 is briefly disconnected and then restored, and the interference signal generated during the disconnection is shielded by the anti-interference circuit 3, thereby preventing the interference signal from interfering with the electronic switch circuit 2, causing the electronic switch circuit 2 to respond to the interference signal to control the disconnection of the power supply VIN by mistake, thereby ensuring the normal power supply of the power supply VIN and the normal use of the electronic device.

[0053] Optionally, the electronic equipment includes but is not limited to electronic products such as a food warming plate, a fan, and an air heater.

[0054] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the claims of the present invention and the scope of equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A power control circuit, characterized in that: include: Anti-dump switch (1); An electronic switch circuit (2), connected to the anti-dump switch (1) and used to connect to a power supply (VIN) to control the on and off of the power supply (VIN); An anti-interference circuit (3) is connected to the electronic switch circuit (2) and is used to shield interference signals from the anti-dumping switch (1) to the electronic switch circuit (2).

2. The power control circuit according to claim 1, characterized in that: The anti-dumping switch comprises a signal terminal (11) and a ground terminal (12), wherein the signal terminal (11) is connected to the electronic switch circuit, and the ground terminal (12) is grounded.

3. The power control circuit according to claim 1, characterized in that: The electronic switch circuit (2) comprises a power input circuit (21) and a first switch circuit (22); the first switch circuit (22) comprises a first transistor (Q1) and a first resistor (R1); the emitter of the first transistor (Q1) is connected to the power input circuit (21), the base of the first transistor (Q1) and one end of the first resistor (R1); the other end of the first resistor (R1) is connected to the anti-dumping switch (1) and the anti-interference circuit (3); the collector of the first transistor (Q1) is used to connect to the power supply (VIN).

4. The power control circuit according to claim 3, characterized in that: The anti-interference circuit comprises a first capacitor (C1), one end of the first capacitor (C1) is connected to the other end of the first resistor (R1), and the other end of the first capacitor (C1) is grounded.

5. The power control circuit according to claim 3, characterized in that: The first switch circuit (22) also includes a second resistor (R2), one end of the second resistor (R2) is connected to the emitter of the first transistor (Q1), and the other end of the second resistor (R2) is connected to the base of the first transistor (Q1).

6. The power control circuit according to claim 3, characterized in that: The first switch circuit further comprises a first diode (D1), wherein the anode of the first diode (D1) is connected to the other end of the first resistor (R1), and the cathode of the first diode (D1) is connected to the anti-dumping switch (1).

7. The power control circuit according to claim 6, characterized in that: The electronic switch circuit (2) further comprises a second switch circuit (23), the second switch circuit (23) comprising a second triode (Q2), a third resistor (R3) and a fourth resistor (R4); the base of the second triode (Q2) is connected to one end of the third resistor (R3) and one end of the fourth resistor (R4), the other end of the third resistor (R3) is connected to the anti-interference circuit (3) and the cathode of the first diode (D1), the other end of the fourth resistor (R4) is connected to the emitter of the second triode (Q2) and the collector of the first triode (Q1), and the collector of the second triode (Q2) is used to connect to the power supply (VIN).

8. The power control circuit according to claim 7, characterized in that: The anti-interference circuit (3) comprises a second capacitor (C2), one end of the second capacitor (C2) is connected to the other end of the third resistor (R3), and the other end of the second capacitor (C2) is grounded.

9. The power control circuit according to claim 7, characterized in that: The second switch circuit (23) further comprises a second diode (D2), wherein an anode of the second diode (D2) is connected to the other end of the third resistor (R3), and a cathode of the second diode (D2) is connected to a cathode of the first diode (D1).

10. An electronic device, characterized in that: include: The power control circuit according to any one of claims 1 to 9.

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