Wide-voltage-range light-touch key self-locking switch control circuit based on independent elements

Abstract

The utility model discloses a wide-voltage-range light-touch button self-locking switch control circuit based on independent elements. The wide-voltage-range light-touch button self-locking switch control circuit comprises an NPN type triode Q1, a PNP type triode Q2, a P-channel MOS tube Q3, an NPN type triode Q4, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a light-touch switch SW1 and a diode D2. Compared with the prior art, the circuit is built by simple independent elements, and on-off control of a direct-current circuit is achieved in a low-cost mode. On-off control over a direct-current power source with the voltage ranging from 1.0 V to 100 V can be achieved on the circuit through component type selection and matching, and the voltage application range of the on-off control circuit is widened. The self-locking switch can be conveniently applied to products with high waterproof requirements and strong space limitation, and the application field of the self-locking switch is expanded. And a microcontroller with relatively high price is not needed, so that the production cost of the circuit is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of switch control of DC power supplies, in particular to a touch button self-locking switch control circuit with a wide voltage range based on independent components. Background Technique

[0002] The self-locking switch control circuit is a kind of circuit in the circuit. In electronic devices, a self-locking switch control circuit is usually designed to protect the power supply. Hard switches or soft switches are often designed in electronic devices. A hard switch is a switch that can be turned on and off by a short press, and a soft switch is a switch that can be turned on and off by a long press or a slide. The switch requires a self-locking switch control circuit to cooperate to maintain the on-off state of the circuit and play a protective role for the circuit.

[0003] In the prior art, the voltage range adapted by similar circuits is relatively limited, and the versatility is poor, which limits the use in many application scenarios. The common solution is to use a microcontroller, but the cost of the microcontroller is relatively high. Another solution is to use a mechanical self-locking switch or a slide switch for control, but such a circuit cannot be applied to some products with small space requirements and waterproof requirements. Content of the Utility Model

[0004] In view of the problems existing in the prior art, the utility model discloses a touch button self-locking switch control circuit with a wide voltage range based on independent components, including a self-locking circuit module, a power switch circuit module, a touch switch SW1, and a diode D2; the self-locking circuit module is respectively connected to the touch switch SW1, the diode D2, and the power switch circuit module.

[0005] The self-locking circuit module includes an NPN transistor Q1, a PNP transistor Q2, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the power switch circuit module includes a P-channel MOS transistor Q3, an NPN transistor Q4, a seventh resistor R7, and an eighth resistor R8.

[0006] As a preferred technical solution of the present utility model, after the first capacitor C1 and the second resistor R2 are connected in series, one path is connected to the C pole of the NPN-type triode Q1, and the other path is connected in parallel with the fourth resistor R4 and then connected to the B pole of the PNP-type triode Q2 after being connected in series with the fifth resistor R5; one end of the touch switch SW1 is connected between the first capacitor C1 and the second resistor R2, and the other end is connected to the B pole of the NPN-type triode Q1 after being connected in series with the first resistor R1 and the diode D2, and the other path is connected to the E pole of the PNP-type triode Q2 after being connected in series with the third resistor R3; the E pole of the NPN-type triode Q1 is grounded; one end of the second capacitor C2 is connected between the first resistor R1 and the diode D2, and the other end is grounded; the C pole of the PNP-type triode Q2 is connected to the voltage input terminal, and the E pole is connected to the B pole of the NPN-type triode Q4 after being connected in series with the seventh resistor R7, and the other path is grounded after being connected in series with the sixth resistor R6; both ends of the eighth resistor R8 are respectively connected to the S and G poles of the P-channel MOS transistor Q3, and the D pole of the P-channel MOS transistor Q3 is connected to the voltage output terminal; the C pole of the NPN-type triode Q4 is connected to the G pole of the P-channel MOS transistor Q3, the E pole is grounded, and the S pole is connected to the voltage output terminal.

[0007] As a preferred technical solution of the present utility model, one end of the first capacitor C1 is connected to the voltage input terminal.

[0008] The beneficial effects of the present utility model: The present utility model builds a circuit design through simple independent components and realizes the switching control of the DC circuit in a low-cost manner. Through the selection and matching of components, the switching control of the DC power supply above 1.0V - 100V can be realized on this circuit, increasing the applicable voltage range of the switching control circuit. Because its control method is a touch button, it can be conveniently used in products with high waterproof requirements and strong space limitations, improving the applicable field of the self-locking switch. Basically, it can cover the switching control of most DC power supplies, without the need to use expensive microcontrollers, reducing the production cost of the circuit. Description of the Drawings

[0009] In order to more clearly illustrate the specific implementation manners of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific implementation manners or the prior art. In all the drawings, the components or parts do not necessarily draw according to the actual ratio.

[0010] Figure 1 It is one of the circuit diagrams of the present utility model;

[0011] Figure 2 It is the second circuit diagram of the present utility model. Detailed Implementation Manner

[0012] Embodiment 1

[0013] As Figure 1 and Figure 2 shown, the present utility model discloses a touch button self-locking switch control circuit with a wide voltage range based on independent components, including a self-locking circuit module, a power switch circuit module, a touch switch SW1, and a diode D2; the self-locking circuit module includes an NPN transistor Q1, a PNP transistor Q2, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the power switch circuit module includes a P-channel MOS transistor Q3, an NPN transistor Q4, a seventh resistor R7, and an eighth resistor R8. After the first capacitor C1 is connected in series with the second resistor R2, one path is connected to the C pole of the NPN transistor Q1, and the other path is connected in parallel with the fourth resistor R4 and then connected in series with the fifth resistor R5 and then connected to the B pole of the PNP transistor Q2; one end of the touch switch SW1 is connected between the first capacitor C1 and the second resistor R2, and the other end is connected to the B pole of the NPN transistor Q1 in series with the first resistor R1 and the diode D2, and the other path is connected to the E pole of the PNP transistor Q2 in series with the third resistor R3; the E pole of the NPN transistor Q1 is grounded; one end of the second capacitor C2 is connected between the first resistor R1 and the diode D2, and the other end is grounded; the C pole of the PNP transistor Q2 is connected to the voltage input terminal, and the E pole is connected to the B pole of the NPN transistor Q4 in series with the seventh resistor R7, and the other path is grounded in series with the sixth resistor R6; both ends of the eighth resistor R8 are respectively connected to the S and G poles of the P-channel MOS transistor Q3, and the D pole of the P-channel MOS transistor Q3 is connected to the voltage output terminal; the C pole of the NPN transistor Q4 is connected to the G pole of the P-channel MOS transistor Q3, the E pole is grounded, and the S pole is connected to the voltage output terminal. It can realize the DC power switch control of more than 1.0V - 100V, increase the voltage application range of the switch control circuit, can be conveniently used in products with high waterproof requirements and strong space limitations, and improve the application field of the self-locking switch.

[0014] The working principle of the present utility model is as follows: When the VIN voltage is applied to the circuit, since the touch switch SW1 is in the off state, no voltage can be obtained on R1. Therefore, the voltage applied to the B pole of the transistor Q1 through R1 and D2 is 0V, and the CE poles of Q1 are in the cut-off state. Thus, the C pole voltage of Q1 is high, and the voltage applied to the B pole of Q2 through R4 and R5 by VIN is high. Therefore, the CE poles of the PNP transistor are in the cut-off state, and the VIN voltage cannot flow through the CE poles of Q2 to R6 and R7. Thus, the B pole voltage of Q4 is 0V, and the CE poles of Q4 are in the cut-off state. The voltage applied to the C pole of Q4 by VIN through R8 is high. The C pole of Q4 is connected to the G pole of the P-channel MOS transistor Q3. Therefore, the G pole of Q3 is also at a high voltage. The DS poles of Q3 are in the cut-off state (Q3 can also be connected to a PNP transistor).

[0015] When the touch switch SW1 is pressed, since the voltage at the lower end of C1 is instantaneously pulled down, according to the AC-pass and DC-block characteristics of the capacitor, C1 is equivalent to a conducting state at this time. VIN supplies power to the base of the triode Q1 through C1 and the auxiliary power supply of R4 and R2, and passes through SW1, R1, and D2, making the CE electrode of Q1 in a conducting state. The C electrode of Q1 is connected to the lower end of R4, thus pulling down the voltage at the lower end of R4. The C electrode of Q1 is connected to R5, and R5 is connected to the base of Q2, making Q2 in a conducting state. VIN supplies power to R6 and R7 through the CE electrode of Q2, enabling R7 to obtain a high voltage. The voltage supplies power to the base of Q4 through R7, making the CE electrode of Q4 in a conducting state, and the voltage at the C electrode of Q4 is pulled down. The C electrode of Q4 is connected to the G electrode (B electrode) of the P-channel MOS transistor (or PNP-type triode) Q3, making Q3 in a conducting state. VIN outputs the VOUT voltage through the DS electrode (EC electrode) of the P-channel MOS transistor (or PNP-type triode) Q3, thereby realizing the open state of the circuit.

[0016] When the touch switch SW1 is pressed again, since the voltage at the lower end of C1 is low, the voltage at the upper end of R1 is instantaneously pulled down, and the voltage supplying power to the base of the NPN-type triode through D2 is 0V, making the state of the CE electrode of Q1 reverse to cut-off. The voltage at the C electrode of Q1 is high. The C electrode of Q1 is connected to R5, thus making the voltage at the base of Q2 connected to R5 become high, and the CE electrode of the PNP-type triode Q2 reverses to cut-off. The voltage at the E electrode of Q2 becomes 0V. The E electrode of Q2 is connected to the base of the NPN-type triode Q4 after current limiting through R7, so the base of Q4 is 0V and Q4 is cut-off. This makes the voltage at the C electrode of Q4 become high. Q4 is connected to the G electrode (B electrode) of the P-channel MOS transistor (or PNP-type triode) Q3, so the voltage at the G electrode (B electrode) of Q3 reverses to high. The DS electrode (CE electrode) of Q3 is cut-off, realizing the closed state of the circuit. By pressing the touch button, the above states are repeatedly switched, thereby realizing the switching operation of the circuit.

[0017] The components not described in detail in this article are prior art.

[0018] Although the specific embodiments of the present invention are described in detail above, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention, and modifications or deformations without creative labor are still within the protection scope of the present invention.

Claims

1. A touch-button self-locking switch control circuit with a wide voltage range based on independent components, characterized by: It includes a self-locking circuit module, a power switch circuit module, a touch switch SW1, and a diode D2; the self-locking circuit module is connected to the touch switch SW1, the diode D2, and the power switch circuit module respectively.

2. The wide voltage range touch key self-locking switch control circuit based on independent components according to claim 1, characterized in that: The self-locking circuit module includes an NPN transistor Q1, a PNP transistor Q2, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the power switch circuit module includes a P-channel MOS transistor Q3, an NPN transistor Q4, a seventh resistor R7, and an eighth resistor R8.

3. The wide voltage range touch key self-locking switch control circuit based on independent components according to claim 2, characterized in that: After the first capacitor C1 is connected in series with the second resistor R2, one path is connected to the C pole of the NPN transistor Q1, and the other path is connected in parallel with the fourth resistor R4, and then connected in series with the fifth resistor R5 to the B pole of the PNP transistor Q2; one end of the touch switch SW1 is connected between the first capacitor C1 and the second resistor R2, and the other end is connected in series with the first resistor R1 and the diode D2 to the B pole of the NPN transistor Q1, and the other end is connected in series with the third resistor R3 to the E pole of the PNP transistor Q2; the E pole of the NPN transistor Q1 is grounded; the second One end of the capacitor C2 is connected between the first resistor R1 and the diode D2, and the other end is grounded; the C pole of the PNP transistor Q2 is connected to the voltage input end, the E pole is connected in series with the seventh resistor R7 to the B pole of the NPN transistor Q4, and the other pole is connected in series with the sixth resistor R6 and then grounded; the two ends of the eighth resistor R8 are respectively connected to the S and G poles of the P-channel MOS transistor Q3, and the D pole of the P-channel MOS transistor Q3 is connected to the voltage output end; the C pole of the NPN transistor Q4 is connected to the G pole of the P-channel MOS transistor Q3, the E pole is grounded, and the S pole is connected to the voltage output end.

4. The wide voltage range touch key self-locking switch control circuit based on independent components according to claim 3, characterized in that: One end of the first capacitor C1 is connected to the voltage input end.

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