Delay key on-off circuit capable of preventing mistaken touch

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By using a delayed button power-on/off circuit, the problem of accidental power-on or power-off of low-power data acquisition instruments due to unintentional touches is solved, thus saving battery power and improving the reliability of data acquisition.

CN224037345UActive Publication Date: 2026-03-24YANGZHOU JING MING TECH

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-12-18
Publication Date: 2026-03-24

AI Technical Summary

Technical Problem

Existing low-power data acquisition instruments are prone to accidental power-on or power-off due to unintentional touches, resulting in battery drain and data acquisition failure.

Method used

A delayed power-on/off circuit for preventing accidental touches was designed. The button circuit outputs a signal to the control circuit, which then outputs a voltage signal to the switch circuit to achieve delayed power-on or power-off, thus avoiding accidental operation caused by unintentional touches.

Benefits of technology

This effectively avoids accidental power-on or power-off of the instrument due to accidental touch, prevents unnecessary battery drain and data acquisition failure, and ensures that the instrument works normally when needed.

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Abstract

The utility model discloses a delay key on-off circuit capable of preventing mistaken touch in the technical field of key on-off control. The delay key on-off circuit comprises a battery, the battery is connected with a switching circuit, the switching circuit is connected with a key circuit, the key circuit is connected with a control circuit, and the control circuit is connected with the switching circuit. The key circuit outputs a power-on signal to the control circuit, the control circuit outputs a corresponding voltage signal to the switching circuit, so that the switching circuit controls and outputs a voltage for supplying power to the instrument, if the key circuit outputs a power-off signal, the switching circuit has no voltage output, the instrument is powered off, and no matter whether the instrument is powered on or powered off, the instrument is powered off. According to the utility model, the key circuit outputs the startup or shutdown signal in a delayed manner, so that the startup or shutdown of the instrument cannot be caused even if instantaneous touch occurs, and meaningless consumption of the electric quantity of a battery and failure of data acquisition are avoided.

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Description

TECHNICAL FIELD

[0001] The utility model relates to the key switch circuit in the key switch control technical field. BACKGROUND

[0002] Low-power consumption collection instrument can be used in many occasions such as battery power supply, solar power supply or mains power supply by adopting low-power consumption design. However, the instrument will start immediately as long as the start key is pressed, which will cause the instrument to start unintentionally due to accidental touch, so that the instrument starts without being used, and the battery will be continuously consumed for a long time, and even the battery power will be finally consumed. Or, no touch during use causes the instrument to shut down, resulting in failure of data collection. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a kind of delay key switch circuits of mistaken touch prevention, can realize delay start or shutdown, avoid the occurrence of mistaken touch caused by no touch to start or shutdown.

[0004] To achieve the above object, the utility model provides a kind of delay key switch circuits of mistaken touch prevention, including battery, battery is connected with switch circuit, switch circuit is connected with key circuit, key circuit is connected with control circuit, control circuit is connected with switch circuit.

[0005] Compared with prior art, the utility model has the beneficial effect that, by the key circuit output start signal to control circuit, then by control circuit output corresponding voltage signal to switch circuit, so that switch circuit control output opens the voltage that instrument is powered, if key circuit output shutdown signal, then switch circuit has no voltage output, then instrument shuts down, whether start or shutdown, key circuit all delay output start or shutdown signal, so that even instantaneous touch occurs, also cannot cause instrument to start or shutdown, to avoid the unnecessary consumption of battery power and the failure of data collection.

[0006] As a further improvement of the utility model, the switch circuit includes a power electronic switch U1, the 11th pin of the power electronic switch U1 is connected with one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R2 is grounded, the other end of the resistor R1 is connected with one end of the capacitor C1 and one end of the capacitor C2, one end of the capacitor C1 is connected with the 7th pin and the 8th pin of the power electronic switch U1, the other end of the capacitor C1 is connected with the 4th pin of the power electronic switch U1, the 4th pin of the power electronic switch U1 is connected with the control circuit, the other end of the capacitor C2 is connected with one end of the capacitor C3, one end of the capacitor C3 is connected with the 1st pin of the socket P1 through the positive electrode of the capacitor C2, the other end of the capacitor C3 is connected with the 2nd pin of the socket P1 through the negative electrode of the capacitor C2 and grounded, the 5th pin and the 6th pin of the power electronic switch U1 are connected and connected with the controlled instrument.

[0007] In this way, when starting, the control circuit outputs a low level signal to the 4th pin of the power electronic switch U1, so that the 4th pin of U1 is low level to open the power output, at this time, the 5th pin and the 6th pin of U1 output the power supply voltage, which is the same as the battery voltage, so that the instrument is powered on; otherwise, the 4th pin of U1 is high level to close the power output, at this time, the 5th pin and the 6th pin of U1 have no voltage output, so that the instrument is powered off.

[0008] As a further improvement of the utility model, the key circuit comprises a key KEY1, one end of the key KEY1 is connected with the 1st pin of the socket P1, the other end of the key KEY1 is connected with one end of the resistor T5 and one end of the resistor R3 respectively, the other end of the resistor R5 is connected with one end of the capacitor C5 and the anode of the diode D1 respectively, the other end of the capacitor C5 is grounded, the cathode of the diode D1 is connected with the 1st pin of the triode Q3, the 3rd pin of the triode Q3 is grounded, the pin of the triode Q3 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the other end of the resistor R3 and the 1st pin of the triode Q1 respectively, the 3rd pin of the triode Q1 is connected with one end of the resistor R3, the 2nd pin of the triode Q1 is connected with one end of the resistor R8 and the control circuit respectively, the other end of the resistor R8 is grounded.

[0009] In this way, during the process of pressing the key, the battery voltage is supplied to the key circuit, the capacitor C5 is charged through the resistor R5, when the charging voltage of the capacitor C5 reaches the set value, the 2nd pin and the 3rd pin of the triode Q3 are turned on, then the battery voltage flows through the key, the 3rd pin and the 1st pin of the triode Q1, the resistor R6, the 2nd pin and the 3rd pin of Q3 and finally to GND to form a loop, at this time, the 3rd pin and the 2nd pin of the triode Q1 are turned on, so that the triode Q2 outputs the CLK signal to the control circuit, and the voltage of the capacitor C5 starts from zero until it reaches the set value, which is the delay time, so that the triode Q2 does not output the CLK signal to the control circuit without touching the key, preventing the instrument from starting when touched.

[0010] As a further improvement of the utility model, the control circuit comprises a flip-flop U2, the 3rd pin, the 4th pin, the 5th pin, the 6th pin, the 7th pin, the 8th pin and the 10th pin of the flip-flop U2 are grounded, the 14th pin of the flip-flop U2 is connected with the 1st pin of the socket P1, the 11th pin of the flip-flop U2 is connected with the 2nd pin of the triode Q1, the 12th pin of the flip-flop U2 is connected with one end of the resistor R7, the other end of the resistor R7 is connected with the 1st pin of the triode Q1, the pin of the triode Q1 is grounded, the 2nd pin of the triode Q1 is connected with one end of the resistor R4 and the 4th pin of the power electronic switch U1 respectively, the other end of the resistor R4 is connected with the 1st pin of the socket P1.

[0011] So when starting, after pressing the button, the pin 11 of U2 receives the CLK signal outputted by the transistor Q2, that is, a rising edge signal, then the pin 12 of U2 outputs the battery voltage of 0V, so the transistor Q2 does not meet the conduction condition, and the Vout-EN voltage outputted by the transistor Q2 is pulled down to the ground due to the conduction of the 2, 3 pins of Q2, and is sent to the pin 4 of the power electronic switch U1, so that the pin 6 of the power electronic switch U1 outputs the battery voltage, thereby realizing starting.

[0012] As a further improvement of the utility model, the pin 6 of the power electronic switch U1 is connected with the positive pole of the capacitor C4, the negative pole of the capacitor C4 is connected with the negative pole of the light emitting diode LED1 and grounded, and the positive pole of the light emitting diode LED1 is connected with the pin 6 of the power electronic switch U1 through the resistor R11.

[0013] So when starting, the pin 6 of the power electronic switch U1 outputs the battery voltage, and the light emitting diode LED1 emits light to make an indication, indicating that the starting is successful. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is the button circuit diagram of the utility model.

[0015] Fig. 2 It is the control circuit diagram of the utility model.

[0016] Fig. 3 It is the switch circuit diagram of the utility model. DETAILED DESCRIPTION

[0017] The utility model will be further explained in connection with the drawings as follows:

[0018] As Figs. 1-3 shown in a kind of anti-mis-touch delay button switch circuit, including battery, battery is connected with switch circuit, switch circuit is connected with button circuit, button circuit is connected with control circuit, control circuit is connected with switch circuit.

[0019] Switch circuit includes power electronic switch U1, the pin 11 of power electronic switch U1 is connected with the one end of resistor R1 and the one end of resistor R2 respectively, the other end of resistor R2 is grounded, the other end of resistor R1 is connected with the one end of capacitor C1 and the one end of capacitor C2 respectively, the one end of capacitor C1 is connected with the pin 7 and 8 of power electronic switch U1 respectively, the other end of capacitor C1 is connected with the pin 4 of power electronic switch U1, the pin 4 of power electronic switch U1 is connected with control circuit, the other end of capacitor C2 is connected with the one end of capacitor C3, the one end of capacitor C3 is connected with the pin 1 of socket P1 through the positive pole of capacitor C2, the other end of capacitor C3 is connected with the pin 2 of socket P1 through the negative pole of capacitor C2 and grounded, the pin 5 and 6 of power electronic switch U1 are connected and connected with controlled instrument.

[0020] The key circuit comprises a key KEY1, one end of the key KEY1 is connected with the pin 1 of the socket P1, the other end of the key KEY1 is connected with one end of the resistor T5 and one end of the resistor R3 respectively, the other end of the resistor R5 is connected with one end of the capacitor C5 and the positive electrode of the diode D1 respectively, the other end of the capacitor C5 is grounded, the negative electrode of the diode D1 is connected with the pin 1 of the transistor Q3, the pin 3 of the transistor Q3 is grounded, the pin 2 of the transistor Q3 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the other end of the resistor R3 and the pin 1 of the transistor Q1 respectively, the pin 3 of the transistor Q1 is connected with one end of the resistor R3, the pin 2 of the transistor Q1 is connected with the resistor R8 and the control circuit respectively, and the other end of the resistor R8 is grounded.

[0021] The control circuit comprises a flip-flop U2, the pins 3, 4, 5, 6, 7, 8 and 10 of the flip-flop U2 are grounded, the pin 14 of the flip-flop U2 is connected with the pin 1 of the socket P1, the pin 11 of the flip-flop U2 is connected with the pin 2 of the transistor Q1, one end of the resistor R7 is connected with the pin 12 of the flip-flop U2, the other end of the resistor R7 is connected with the pin 1 of the transistor Q1, the pin 2 of the transistor Q1 is grounded, the pin 2 of the transistor Q1 is connected with one end of the resistor R4 and the pin 4 of the power electronic switch U1 respectively, and the other end of the resistor R4 is connected with the pin 1 of the socket P1.

[0022] The pin 6 of the power electronic switch U1 is connected with the positive electrode of the capacitor C4, the negative electrode of the capacitor C4 is connected with the negative electrode of the light emitting diode LED1 and grounded, and the positive electrode of the light emitting diode LED1 is connected with the pin 6 of the power electronic switch U1 through the resistor R11.

[0023] In the utility model, the battery voltage is taken as 7.5V for example and the specific description is as follows.

[0024] P1 is the battery input socket, the battery voltage is 7.5V, C2 and C3 are the filter capacitors of the battery voltage.

[0025] U2 is a double-channel D type flip-flop.

[0026] U1 is a power electronic switch, the pin 11 of which is an overvoltage protection pin, the OVP reference voltage is typically 1.1V, and the set threshold is about 9.3V. When the battery voltage exceeds 9.3V, the voltage of the pins 5 and 6 of the overvoltage protection U1 has no output, thereby playing the role of overvoltage protection.

[0027] When the key KEY1 is pressed, the battery voltage Vbat charges the capacitor C5 through the key KEY1 and the resistor R5, and when the voltage reaches 1.4V, the 2nd and 3rd pins of the transistor Q3 are turned on. Then, Vbat flows through the key, the 3rd and 1st pins of the transistor Q1, the resistor R6, the 2nd and 3rd pins of the transistor Q3 to GND to form a loop. At this time, the 3rd and 2nd pins of the transistor Q1 are turned on, and the voltage of the CLK signal output from the 2nd pin of the transistor Q1 is 7.2V.

[0028] Table 1 is a logic table of the present application.

[0029]

[0030] When the key KEY1 is pressed, the battery voltage Vbat charges the capacitor C5 through the key KEY1 and the resistor R5, and when the voltage reaches 1.4V, the 2nd and 3rd pins of the transistor Q3 are turned on. Then, Vbat flows through the key, the 3rd and 1st pins of the transistor Q1, the resistor R6, the 2nd and 3rd pins of the transistor Q3 to GND to form a loop. At this time, the 3rd and 2nd pins of the transistor Q1 are turned on, and the voltage of the CLK signal output from the 2nd pin of the transistor Q1 is 7.2V.

[0031] When the key KEY1 is pressed, the battery voltage Vbat charges the capacitor C5 through the key KEY1 and the resistor R5, and when the voltage reaches 1.4V, the 2nd and 3rd pins of the transistor Q3 are turned on. Then, Vbat flows through the key, the 3rd and 1st pins of the transistor Q1, the resistor R6, the 2nd and 3rd pins of the transistor Q3 to GND to form a loop. At this time, the 3rd and 2nd pins of the transistor Q1 are turned on, and the voltage of the CLK signal output from the 2nd pin of the transistor Q1 is 7.2V.

[0032] When the key KEY1 is pressed, the battery voltage Vbat charges the capacitor C5 through the key KEY1 and the resistor R5, and when the voltage reaches 1.4V, the 2nd and 3rd pins of the transistor Q3 are turned on. Then, Vbat flows through the key, the 3rd and 1st pins of the transistor Q1, the resistor R6, the 2nd and 3rd pins of the transistor Q3 to GND to form a loop. At this time, the 3rd and 2nd pins of the transistor Q1 are turned on, and the voltage of the CLK signal output from the 2nd pin of the transistor Q1 is 7.2V.

[0033] No matter turning on or off, once the key is released, the capacitor C5 is discharged, and the discharge circuit is diode D1, 1 foot and 3 foot of triode Q3 and GND. Because there is a capacitor between 1 foot and 3 foot of triode Q1, which is the capacitor that triode itself has, then its discharge circuit is 3 foot of triode Q1, to resistor R3, and finally to 1 foot of triode Q1. The function of resistor R3 is to make the capacitor between 3 foot and 1 foot of triode fast discharge, and give 1 foot a known logic state, preventing the uncertainty of the working state of triode when the control input is high resistance. In this way, the function of fast and convenient discharge is realized, so that the key can be pressed again in a short time and still work.

[0034] The utility model is not limited to the above-mentioned embodiments, on the basis of the technical scheme of the present disclosure, those skilled in the art can make some substitutions and deformations to some technical features in the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the utility model.

Claims

1. A delay-time button power-on / off circuit to prevent accidental touch, characterized in that: This includes a battery, which is connected to a switch circuit. The switch circuit is connected to a button circuit. The button circuit is connected to a control circuit. The control circuit is connected to the switch circuit. The switching circuit includes a power electronic switch U1. Pin 11 of the power electronic switch U1 is connected to one end of resistor R1 and one end of resistor R2. The other end of resistor R2 is grounded. The other end of resistor R1 is connected to one end of capacitor C1 and one end of capacitor C2. One end of capacitor C1 is connected to pins 7 and 8 of the power electronic switch U1. The other end of capacitor C1 is connected to pin 4 of the power electronic switch U1. Pin 4 of the power electronic switch U1 is connected to the control circuit. The other end of capacitor C2 is connected to one end of capacitor C3. One end of capacitor C3 is connected to pin 1 of socket P1 via the positive terminal of capacitor C2. The other end of capacitor C3 is connected to pin 2 of socket P1 via the negative terminal of capacitor C2 and grounded. Pins 5 and 6 of the power electronic switch U1 are connected and connected to the controlled instrument.

2. The delay button power-on / off circuit for preventing accidental touches according to claim 1, characterized in that: The button circuit includes button KEY1. One end of button KEY1 is connected to pin 1 of socket P1. The other end of button KEY1 is connected to one end of resistor T5 and one end of resistor R3. The other end of resistor R5 is connected to one end of capacitor C5 and the positive terminal of diode D1. The other end of capacitor C5 is grounded. The negative terminal of diode D1 is connected to pin 1 of transistor Q3. Pin 3 of transistor Q3 is grounded. One pin of transistor Q3 is connected to one end of resistor R6. The other end of resistor R6 is connected to the other end of resistor R3 and pin 1 of transistor Q1. Pin 3 of transistor Q1 is connected to one end of resistor R3. Pin 2 of transistor Q1 is connected to one end of resistor R8 and the control circuit. The other end of resistor R8 is grounded.

3. The delay button power-on / off circuit for preventing accidental touches according to claim 2, characterized in that: The control circuit includes a trigger U2. Pins 3, 4, 5, 6, 7, 8, and 10 of trigger U2 are grounded. Pin 14 of trigger U2 is connected to pin 1 of socket P1. Pin 11 of trigger U2 is connected to pin 2 of transistor Q1. Pin 12 of trigger U2 is connected to one end of resistor R7. The other end of resistor R7 is connected to pin 1 of transistor Q1. Pin 2 of transistor Q1 is grounded. Pin 2 of transistor Q1 is connected to one end of resistor R4 and pin 4 of power electronic switch U1. The other end of resistor R4 is connected to pin 1 of socket P1.

4. The delay button power-on / off circuit for preventing accidental touches according to claim 3, characterized in that: Pin 6 of the power electronic switch U1 is connected to the positive terminal of capacitor C4. The negative terminal of capacitor C4 is connected to the negative terminal of LED1 and grounded. The positive terminal of LED1 is connected to pin 6 of the power electronic switch U1 via resistor R11.