A touch-type power switch suitable for small battery-powered electronic devices

Abstract

The present invention relates to the field of switch technology, and in particular to a touch-type power switch suitable for small battery-powered electronic devices, comprising a power supply battery BT1, a dual D flip-flop U1A, a voltage converter U2 and a touch switch S1, wherein the VCC of the power supply battery BT1 is connected to the pin 1 of the voltage converter U2, one end of the touch switch S1 is connected to the pin 3 of the dual D flip-flop U1A, the other end of the touch switch S1 is connected to a capacitor C3, and the capacitor C3 is connected to the pin 8 of the voltage converter U2. The touch-type power switch has the characteristics of free power switching and almost no power consumption of the whole machine when shut down, and is suitable for various battery-powered electronic devices with loads within 5V and 500mA.

Description

Technical Field

[0001] The present invention relates to the technical field of switches, and in particular to a touch-type power switch suitable for small battery-powered electronic equipment. Background Art

[0002] In many electronic devices that use batteries, mechanical power switches are used to extend the battery life, such as the multimeters we often use. However, for some electronic devices that use batteries, the use of mechanical power switches is limited due to various reasons, which requires a non-mechanical power switch, such as a touch-type power switch.

[0003] To meet the use requirements, the touch power switch must have the characteristics of free power on and off and almost no power consumption when the whole machine is turned off. In view of the above problems, a touch power switch suitable for small battery-powered electronic devices is designed. Summary of the invention

[0004] The object of the present invention is to provide a touch-type power switch suitable for small battery-powered electronic devices to solve the above technical problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A touch power switch suitable for a small battery-powered electronic device, comprising a power supply battery BT1, a dual D flip-flop U1A, a voltage converter U2 and a touch switch S1, wherein the VCC of the power supply battery BT1 is connected to pin 1 of the voltage converter U2, one end of the touch switch S1 is connected to pin 3 of the dual D flip-flop U1A, the other end of the touch switch S1 is connected to a capacitor C3, and the capacitor C3 is connected to pin 8 of the voltage converter U2;

[0007] The line between the capacitor C3 and the touch switch S1 is connected to the capacitor C1, the resistor R2, the pin 6 of the dual D flip-flop U1A, and the pins 5, 6, and 7 of the voltage converter U2; the capacitor C1 is connected to the line between the touch switch S1 and the pin 3 of the dual D flip-flop U1A; the resistor R2 is connected to the line between the VCC of the power supply battery BT1 and the pin 1 of the voltage converter U2 through the capacitor C2; the line between the VCC of the power supply battery BT1 and the pin 1 of the voltage converter U2 and the line between the touch switch S1 and the pin 3 of the dual D flip-flop U1A are connected with the resistor R1;

[0008] Pin 2 and pin 4 of the voltage converter U2 are connected to pin 7 and pin 1 of the dual D flip-flop U1A respectively, the line between pin 2 of the voltage converter U2 and pin 7 of the dual D flip-flop U1A is connected to pin 3 of the voltage converter U2 and to the line between the touch switch S1 and the capacitor C3, pin 5 and pin 2 of the dual D flip-flop U1A are connected, pin 14 of the dual D flip-flop U1A is connected to the line between VCC of the power supply battery BT1 and pin 1 of the voltage converter U2, and pin 4 of the dual D flip-flop U1A is connected to the line between the resistor R2 and the capacitor C2.

[0009] Preferably, the power supply battery BT1 is a 7.2V lithium battery, and the voltage converter U2 is 5V, 500mA.

[0010] Preferably, the S1 touch switch is a film touch switch.

[0011] Preferably, the power supply battery BT1 is one of various batteries ranging from 6V to 11.5V.

[0012] The beneficial effects of the present invention are:

[0013] This touch power switch has the characteristics of free power on and off, and almost no power consumption when the whole machine is turned off. It is suitable for various battery-powered electronic devices with loads within 5V and 500mA. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the circuit structure of the present invention; DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0016] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0017] Example 1

[0018] like Figure 1As shown, a touch power switch suitable for a small battery-powered electronic device includes a power supply battery BT1, a dual D flip-flop U1A, a voltage converter U2 and a touch switch S1, wherein the S1 touch switch is a thin film touch switch, wherein the VCC of the power supply battery BT1 is connected to the pin 1 of the voltage converter U2, one end of the touch switch S1 is connected to the pin 3 of the dual D flip-flop U1A, the other end of the touch switch S1 is connected to the capacitor C3, and the capacitor C3 is connected to the pin 8 of the voltage converter U2;

[0019] The line between the capacitor C3 and the touch switch S1 is connected to the capacitor C1, the resistor R2, the pin 6 of the dual D flip-flop U1A, and the pins 5, 6, and 7 of the voltage converter U2; the capacitor C1 is connected to the line between the touch switch S1 and the pin 3 of the dual D flip-flop U1A; the resistor R2 is connected to the line between the VCC of the power supply battery BT1 and the pin 1 of the voltage converter U2 through the capacitor C2; the line between the VCC of the power supply battery BT1 and the pin 1 of the voltage converter U2 and the line between the touch switch S1 and the pin 3 of the dual D flip-flop U1A are connected with the resistor R1;

[0020] Pin 2 and pin 4 of the voltage converter U2 are connected to pin 7 and pin 1 of the dual D flip-flop U1A respectively, the line between pin 2 of the voltage converter U2 and pin 7 of the dual D flip-flop U1A is connected to pin 3 of the voltage converter U2 and to the line between the touch switch S1 and the capacitor C3, pin 5 and pin 2 of the dual D flip-flop U1A are connected, pin 14 of the dual D flip-flop U1A is connected to the line between VCC of the power supply battery BT1 and pin 1 of the voltage converter U2, and pin 4 of the dual D flip-flop U1A is connected to the line between the resistor R2 and the capacitor C2.

[0021] The power supply battery BT1 is a 7.2V lithium battery, the voltage converter U2 is 5V, 500mA, and the power supply battery BT1 is one of various batteries ranging from 6V to 11.5V.

[0022] When the power supply battery BT1 is connected to the circuit at the beginning, since the voltage on the capacitor C2 is 0, the Q end of the dual D trigger U1A is a low voltage, the voltage converter U2 is turned off, and its OUT end has no output, the power supply is in the off state, and after several milliseconds, the capacitors C1 and C2 are fully charged; in the off state, the touch switch S1 is touched, the capacitor C1 is discharged to 0, and after several milliseconds, the resistor R1 charges the voltage on the capacitor C1 to a high level, the Q of the dual D trigger U1A becomes a high level, the voltage converter U2 is turned on, there is a 5V power output, and the power supply is in the on state; in the on state, the touch switch S1 is touched, the capacitor C1 is discharged to 0 again, and after several milliseconds, the resistor R1 charges the voltage on the capacitor C1 to a high level, the Q of the dual D trigger U1A becomes a low level, the voltage converter U2 is turned off, and the power supply is in the on state.

[0023] The above process realizes the free switching of the power supply. In the shutdown state, since there is no 5V output at pin 8 of the voltage converter U2, the power consumption of the whole machine is mainly composed of the dual D trigger U1A4013, the voltage converter U2MAX603, the resistors R1, R2, the capacitors C1, C2 and the self-consumption of the power supply battery BT1. Since capacitors C1 and C2 use small-capacity capacitors, when capacitors C1 and C2 are fully charged and in a static state, the power consumption can be almost ignored. The self-discharge of the power supply battery BT1 also exists when using a mechanical power switch, and it is not considered. The static power consumption of the dual D trigger U1A4013 under a 7.2V power supply is about 1uA, and the maximum static current of the voltage converter U2 MAX603 in the off state is 2uA. Therefore, the maximum power consumption of this touch power switch in the off state is about 3uA. If we use a 1Ah lithium battery, theoretically, the power in the lithium battery can be maintained for more than 30 years in the off state, which fully meets our requirement that the whole machine has almost no power consumption when it is turned off.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A touch power switch suitable for small battery-powered electronic devices, comprising a power supply battery BT1, a dual D flip-flop U1A, a voltage converter U2 and a touch switch S1, characterized in that: The VCC of the power supply battery BT1 is connected to the pin 1 of the voltage converter U2, one end of the touch switch S1 is connected to the pin 3 of the dual D flip-flop U1A, the other end of the touch switch S1 is connected to the capacitor C3, and the capacitor C3 is connected to the pin 8 of the voltage converter U2; The line between the capacitor C3 and the touch switch S1 is connected to the capacitor C1, the resistor R2, the pin 6 of the dual D flip-flop U1A, and the pins 5, 6, and 7 of the voltage converter U2; the capacitor C1 is connected to the line between the touch switch S1 and the pin 3 of the dual D flip-flop U1A; the resistor R2 is connected to the line between the VCC of the power supply battery BT1 and the pin 1 of the voltage converter U2 through the capacitor C2; the line between the VCC of the power supply battery BT1 and the pin 1 of the voltage converter U2 and the line between the touch switch S1 and the pin 3 of the dual D flip-flop U1A are connected with the resistor R1; Pin 2 and pin 4 of the voltage converter U2 are connected to pin 7 and pin 1 of the dual D flip-flop U1A respectively, the line between pin 2 of the voltage converter U2 and pin 7 of the dual D flip-flop U1A is connected to pin 3 of the voltage converter U2 and is connected to the line between the touch switch S1 and the capacitor C3, pin 5 and pin 2 of the dual D flip-flop U1A are connected, pin 14 of the dual D flip-flop U1A is connected to the line between VCC of the power supply battery BT1 and pin 1 of the voltage converter U2, and pin 4 of the dual D flip-flop U1A is connected to the line between the resistor R2 and the capacitor C2; The power supply battery BT1 is a 7.2V lithium battery, and the voltage converter U2 is 5V, 500mA; The touch switch S1 is a thin film touch switch.

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