A touch or contactless sensing circuit and its working method

Abstract

The present invention relates to a touch or non-contact induction circuit and its working method. It includes a high-frequency signal generator circuit for generating high-frequency quasi-square wave signals, a human body induction and detection circuit for realizing human body touch or non-contact induction and for detecting the high-frequency signals emitted by the high-frequency signal generator circuit, and a signal output circuit for realizing the output of control signals. In the normal working state, the high-frequency quasi-square wave signals generated by the high-frequency signal generator circuit are detected by the human body induction and detection circuit and output to the signal output circuit, so that the signal output circuit outputs a low / high level signal. When a human body touches or is in the non-contact induction area, the human body touch or non-contact induction signal is detected through the human body induction and detection circuit, realizing the blocking effect on the high-frequency quasi-square wave signals, so that the signal output circuit outputs a high / low level signal. The present invention has a wide working voltage range and a small working current. In addition, this valve can be applied to occasions with low voltage and large voltage fluctuations.

Description

Technical Field

[0001] The present invention relates to a touch or non-contact induction circuit and its working method. Background Art

[0002] Existing touch induction circuits generally adopt the resistance wire or capacitive method to achieve, while non-contact induction circuits generally achieve through infrared induction. To be able to achieve both touch induction circuits and non-contact induction circuits, obviously the two methods alone cannot be achieved, and they need to be combined with each other. Moreover, whether it is the existing touch induction circuit or non-contact induction circuit, because an MCU is required to achieve signal induction control, they both need to work above 1.5V. This greatly limits the application scenarios of the induction circuit, and the working current of the existing induction circuit is relatively large, which is not conducive to energy conservation. Summary of the Invention

[0003] The purpose of the present invention is to provide a touch or non-contact induction circuit and its working method. The present invention has a wide working voltage range and a small working current. In addition, this valve can be applied to occasions with low voltage and large voltage fluctuations.

[0004] To achieve the above object, the technical solution of the present invention is: a touch or non-contact induction circuit, including a high-frequency signal generator circuit for generating high-frequency square-wave signals, a human body induction and detection circuit for realizing human touch or non-contact induction and for detecting the high-frequency signals sent by the high-frequency signal generator circuit, and a signal output circuit for realizing the output of control signals. In the normal working state, the high-frequency square-wave signals generated by the high-frequency signal generator circuit are detected by the human body induction and detection circuit and output to the signal output circuit, so that the signal output circuit outputs low / high level signals. When a human body touches or is in the non-contact induction area, the human body touch or non-contact induction signal is detected through the human body induction and detection circuit, realizing the blocking effect on the high-frequency square-wave signals, so that the signal output circuit outputs high / low level signals.

[0005] In an embodiment of the present invention, the high-frequency signal generator circuit includes resistors R5, R6, R7, R8, capacitors C1, C2, C9, transistors Q4, Q5. One ends of R5, R6, R7, R8 are connected to the power supply terminal. The other end of R5 is connected to one end of C1 and the collector of Q4. The other end of R6 is connected to the other end of C1 and the base of Q5. The other end of R7 is connected to one end of C2 and the base of Q4. The other end of R8 is connected to the other end of C2 and the collector of Q5, and serves as the output terminal of the high-frequency signal generator circuit. The emitters of Q4 and Q5 are connected to the ground terminal.

[0006] In an embodiment of the present invention, the human body sensing and detection circuit includes diodes D1, D2, D3, resistors R9, R10, R15, capacitors C3, C4, C5, a triode Q6, sensing contacts CM1, CM2. The cathode of D1 is connected to the anode of D2, CM2, and one end of C4. The anode of D1 is connected to one end of R15, one end of C5, and the emitter of Q6 and is connected to the ground terminal. The cathode of D2 is connected to the other end of C5 and one end of R9. The other end of R9 is connected to the base of Q6. The collector of Q6 is connected to the power supply terminal via R10. The collector of Q6 is connected to the signal output circuit. The cathode of D3 is connected to the first power supply terminal. The anode of D3 is connected to the other end of C4, the other end of R15, CM1, and one end of C3. The other end of C3 is connected to the high-frequency signal generator circuit.

[0007] In an embodiment of the present invention, the signal output circuit includes triodes Q7, Q8, resistors R11, R12, R14. The base of Q7 serves as the input terminal of the signal output circuit. The emitter of Q7 is connected to the ground terminal. The collector of Q7 is connected to one end of R11 and the base of Q8 via R12. The emitter of Q8 is connected to the other end of R11 and is connected to the power supply terminal. The collector of Q8 is connected to the ground terminal via R14. The collector of Q8 serves as the output terminal of the signal output circuit.

[0008] In an embodiment of the present invention, it further includes a secondary voltage stabilizing circuit, which includes triodes Q1, Q2, Q3, resistors R1, R2, R3, R4. The collector of Q1 and one end of R3 are connected as the power supply terminal. The emitter of Q1 and one end of R1 are connected to the first power supply terminal. The base of Q1 is connected to the collector of Q2 via R2. The base of Q2 is connected to the collector of Q3 and the other end of R1. The emitter of Q2, the emitter of Q3, and one end of R4 are connected to the ground terminal. The base of Q3 is connected to the other end of R4 and the other end of R3.

[0009] In an embodiment of the present invention, it further includes a primary voltage stabilizing circuit, which includes triodes Q9, Q10, Q11, resistors R15, R16, R17, R18. The collector of Q9 and one end of R17 are connected as the first power supply terminal. The emitter of Q9 and one end of R15 are connected to the second power supply terminal. The base of Q9 is connected to the collector of Q10 via R16. The base of Q10 is connected to the collector of Q11 and the other end of R15. The emitter of Q10, the emitter of Q11, and one end of R18 are connected to the ground terminal. The base of Q11 is connected to the other end of R18 and the other end of R17.

[0010] The present invention also provides a consistent touch or non-contact induction circuit and its working method based on the above, which are realized as follows:

[0011] Under normal working conditions, that is, when there is no human touch or no human body in the non-contact sensing area, the high-frequency square wave signal generated by the high-frequency signal generator circuit outputs a high-level signal to Q6 through the detection circuit composed of D1, D2, and C5 in the human body sensing and detection circuit, so that Q6 is turned on and outputs a low-level signal; when the human body touches or is in the non-contact sensing area, there are two situations: first, since the clutter signal in the air received by the human body is stronger than the high-frequency square wave signal generated by the high-frequency signal generator circuit, the high-frequency square wave signal is blocked, and the DC signal of the clutter signal in the air received by the human body is blocked by C4, so that the base of Q6 is low level, Q6 is cut off, and thus a high-level signal is output; second, the high-frequency square wave signal generated by the high-frequency signal generator circuit is discharged through the human body, so that there is no signal in the back-end circuit, so that the base of Q6 is low level, Q6 is cut off, and thus a high-level signal is output.

[0012] The high frequency signal generator circuit of the present invention works as follows:

[0013] When the power is turned on, the bases of Q4 and Q5 are connected to the power supply through R6 and R7 respectively. Since the parameters of Q4 and Q5 cannot be completely consistent, it is assumed that the i of Q4 c4 Bigger, u c4 Decreases, because the voltage across C1 cannot change suddenly, so u b5 Decline, i b5 Reduce, i c5 Reduce, u c5 Increase, u c5 The changing voltage is coupled through C2, which makes i b4 Increase, thereby promoting i c4 Further increase forms a strong positive feedback, and this process is repeated until Q4 is saturated and Q5 is cut off;

[0014] When Q4 is turned on, the power supply charges C2 to the turn-on voltage value of Q4 through R8, C2, and the emitter junction of Q4. At the same time, C1 discharges through the ce junction of Q4, the power supply, and R6. When Q4 is saturated, its u ce ≈01.V, so the potential at the other end (right end) of C1, i.e. the base potential of Q5, starts to be negative. When C1 is discharged, it will be charged in the direction of discharge. When the base potential of Q5 rises to 0.5V, Q5 starts to conduct, u c5 It starts to decrease, triggering a new round of positive feedback process, causing Q4 to be quickly cut off and Q5 to be quickly saturated;

[0015] When Q5 is turned on, the power supply charges C1 to the turn-on voltage value of Q5 through R5, C1, and the emitter junction of Q5. At the same time, C2 discharges through the ce junction of Q5, the power supply, and R7. When Q5 is saturated, its u ce≈01.V, so the initial potential of one end (left end) of C2, which is the base potential of Q4, is negative. After C2 finishes discharging, it will be charged in the discharging direction. When the base potential of Q4 rises to 0.5V, Q4 starts to conduct, and u c4 starts to drop, triggering a new round of positive feedback process, causing Q5 to quickly cut off and Q4 to quickly saturate;

[0016] Then a new round of repetition occurs. Through the alternating conduction and cutoff of Q4 and Q5, a high-frequency square-wave-like signal is output at the collector of Q5.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The circuit of the present invention has a wide working voltage range and a small working current, can work at an ultra-low working voltage, and realizes induction when a human body touches or approaches the contactless induction area by using the human body to receive radio wave miscellaneous signals in the air, thereby controlling the output of the signal; in addition, through the voltage stabilization function of the voltage stabilization circuit, the present invention can be applied to occasions with low voltage and large voltage fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the circuit principle block diagram of the present invention.

[0019] Figure 2 is the circuit schematic diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] The technical solution of the present invention will be specifically described below in conjunction with the drawings.

[0021] The present invention provides a touch or contactless induction circuit, including a high-frequency signal generator circuit for generating a high-frequency square-wave-like signal, a human body induction and detection circuit for realizing human body touch or contactless induction and for detecting the high-frequency signal sent by the high-frequency signal generator circuit, and a signal output circuit for realizing the output of a control signal. In the normal working state, the high-frequency square-wave-like signal generated by the high-frequency signal generator circuit is detected and output to the signal output circuit by the human body induction and detection circuit, so that the signal output circuit outputs a low / high level signal. When a human body touches or approaches the contactless induction area, the human body touch or contactless induction signal is detected by the human body induction and detection circuit, realizing the blocking effect on the high-frequency square-wave-like signal, so that the signal output circuit outputs a high / low level signal.

[0022] The present invention also provides a consistent touch or contactless induction circuit and its working method based on the above, which is realized as follows:

[0023] In the normal working state, that is, when there is no human touch or no human body is in the non-contact induction area, the high-frequency square-wave-like signal generated by the high-frequency signal generator circuit is output as a high-level signal to Q6 through the detection circuit composed of D1, D2, and C5 in the human body induction and detection circuit, making Q6 conduct, and thus outputting a low-level signal; when a human body touches or a human body is in the non-contact induction area, there are two situations: First, since the clutter signal in the air received by the human body is stronger than the high-frequency square-wave-like signal generated by the high-frequency signal generator circuit, the high-frequency square-wave-like signal is blocked, and the DC signal of the clutter signal in the air received by the human body is blocked by C4, making the base of Q6 at a low level, and Q6 is cut off, thus outputting a high-level signal; Second, the high-frequency square-wave-like signal generated by the high-frequency signal generator circuit discharges through the human body, so that there is no signal in the subsequent circuit, making the base of Q6 at a low level, and Q6 is cut off, thus outputting a high-level signal.

[0024] The working mode of the high-frequency signal generator circuit of the present invention is as follows:

[0025] When the power is turned on, the bases of Q4 and Q5 are respectively connected to the power supply through R6 and R7. Since the parameters of Q4 and Q5 cannot be exactly the same, assuming that the i of Q4 c4 is larger and the u c4 decreases. Because the voltage across C1 cannot change suddenly, the u b5 drops, the i b5 decreases, the i c5 decreases, the u c5 rises, the u c5 The changing voltage is coupled through C2, which in turn makes the i b4 increase, thus promoting the i c4 to increase further, forming a strong positive feedback. This process loops continuously until Q4 saturates and Q5 cuts off;

[0026] When Q4 conducts, the power supply charges C2 to the conduction voltage value of Q4 through R8, C2, and the emitter junction of Q4. At the same time, C1 discharges through the ce junction of Q4, the power supply, and R6; since when Q4 saturates, its u ce ≈01.V, so the potential at the other end (right end) of C1, that is, the initial value of the base potential of Q5, is negative. When C1 finishes discharging, it will also charge in the discharging direction. When the base potential of Q5 rises to 0.5V, Q5 starts to conduct, and the u c5 starts to drop, triggering a new round of positive feedback process, making Q4 quickly cut off and Q5 quickly saturate;

[0027] When Q5 conducts, the power supply charges C1 to the conduction voltage value of Q5 through R5, C1, and the emitter junction of Q5. At the same time, C2 discharges through the ce junction of Q5, the power supply, and R7; since when Q5 saturates, its u ce≈01.V, so the initial potential at one end (left end) of C2, which is the base potential of Q4, is negative. After C2 finishes discharging, it will be charged in the discharging direction. When the base potential of Q4 rises to 0.5V, Q4 starts to conduct, and u c4 starts to drop, triggering a new positive feedback process, causing Q5 to quickly cut off and Q4 to quickly saturate;

[0028] Then a new round of repetition occurs. Through the alternating conduction and cutoff of Q4 and Q5, a high-frequency square-wave-like signal is output at the collector of Q5.

[0029] The following is the specific implementation process of the present invention.

[0030] Specifically, as Figure 1 shown, a touch or non-contact induction circuit of this valve includes a high-frequency signal generator circuit, a human body induction and detection circuit, a signal output circuit, a first-stage voltage stabilization circuit, and a second-stage voltage stabilization circuit.

[0031] The following Figure 2 will elaborate on each circuit component of the present invention in detail.

[0032] As Figure 2 shown, the high-frequency signal generator circuit includes resistors R5, R6, R7, R8, capacitors C1, C2, C9, and transistors Q4, Q5. One ends of R5, R6, R7, R8 are connected to the power supply terminal. The other end of R5 is connected to one end of C1 and the collector of Q4. The other end of R6 is connected to the other end of C1 and the base of Q5. The other end of R7 is connected to one end of C2 and the base of Q4. The other end of R8 is connected to the other end of C2 and the collector of Q5, and serves as the output terminal of the high-frequency signal generator circuit. The emitters of Q4 and Q5 are connected to the ground terminal.

[0033] Figure 2 The power supply terminal VDD = 0.8V in [] is the voltage after the first-stage and second-stage voltage stabilizations. Without the first-stage and second-stage voltage stabilizations, the high-frequency signal generator circuit can also work independently as long as the working voltage is stable and the voltage withstand of each component is sufficient. Any voltage above 0.8V (actually, the conduction voltage of Q4 and Q5 is sufficient) is acceptable.

[0034] The working principle of the high-frequency signal generator circuit is as follows:

[0035] When the power is turned on, the bases of Q4 and Q5 are respectively connected to the power supply through R6 and R7. Since the parameters of Q4 and Q5 cannot be exactly the same, assuming the i of Q4 c4 is larger, u c4 decreases. Because the voltage across C1 cannot change suddenly, u b5 drops, i b5 decreases, i c5Decrease, u c5 Increase, u c5 The varying voltage is coupled through C2, which in turn causes i b4 To increase, thereby prompting i c4 To increase further, forming a strong positive feedback. This process repeats continuously until Q4 saturates and Q5 cuts off;

[0036] When Q4 conducts, the power supply charges C2 to the conduction voltage value of Q4 through R8, C2, and the emitter junction of Q4. At the same time, C1 discharges through the ce junction of Q4, the power supply, and R6; since when Q4 saturates, its u ce ≈01.V, thus the potential at the other end (right end) of C1, which is the initial value of the base potential of Q5, is negative. When C1 finishes discharging, it will continue to charge in the discharging direction. When the base potential of Q5 rises to 0.5V, Q5 starts to conduct, and u c5 Starts to decrease, triggering a new round of positive feedback process, causing Q4 to cut off rapidly and Q5 to saturate rapidly;

[0037] When Q5 conducts, the power supply charges C1 to the conduction voltage value of Q5 through R5, C1, and the emitter junction of Q5. At the same time, C2 discharges through the ce junction of Q5, the power supply, and R7; since when Q5 saturates, its u ce ≈01.V, thus the potential at one end (left end) of C2, which is the initial value of the base potential of Q4, is negative. When C2 finishes discharging, it will continue to charge in the discharging direction. When the base potential of Q4 rises to 0.5V, Q4 starts to conduct, and u c4 Starts to decrease, triggering a new round of positive feedback process, causing Q5 to cut off rapidly and Q4 to saturate rapidly;

[0038] Then a new round of repetition occurs. Through the alternating conduction and cut-off of Q4 and Q5, a high-frequency square-wave signal is output at the collector of Q5.

[0039] As Figure 2 Shown, the human body induction and detection circuit includes diodes D1, D2, D3, resistors R9, R10, R15, capacitors C3, C4, C5, transistor Q6, induction contacts CM1, CM2. The cathode of D1 is connected to the anode of D2, CM2, and one end of C4. The anode of D1 is connected to one end of R15, one end of C5, and the emitter of Q6 and is connected to the ground terminal. The cathode of D2 is connected to the other end of C5 and one end of R9. The other end of R9 is connected to the base of Q6. The collector of Q6 is connected to the power supply terminal through R10. The collector of Q6 is connected to the signal output circuit. The cathode of D3 is connected to the first power supply terminal. The anode of D3 is connected to the other end of C4, the other end of R15, CM1, and one end of C3. The other end of C3 is connected to the high-frequency signal generator circuit.

[0040] Its working principle is as follows: In the normal working state (i.e., when there is no human touch or no human is in the non-contact induction area), the high-frequency square-wave-like signal generated by the high-frequency signal generator circuit passes through the detection circuit composed of D1, D2, and C5 in the human body induction and detection circuit and outputs a high-level signal to Q6, making Q6 conduct, and thus outputting a low-level signal; when a human touches or a human is in the non-contact induction area, there are two cases: First, since the clutter signal in the air received by the human body is stronger than the high-frequency square-wave-like signal generated by the high-frequency signal generator circuit, the high-frequency square-wave-like signal is blocked, and the clutter signal in the air received by the human body is relatively direct current and is blocked by C4, making the base of Q6 at a low level, Q6 cut off, and thus outputting a high-level signal; Second, the high-frequency square-wave-like signal generated by the high-frequency signal generator circuit discharges through the human body, so that there is no signal in the subsequent circuit, making the base of Q6 at a low level, Q6 cut off, and thus outputting a high-level signal;

[0041] As Figure 2 shown, the signal output circuit includes transistors Q7, Q8, resistors R11, R12, R14. The base of Q7 serves as the input end of the signal output circuit. The emitter of Q7 is connected to the ground terminal. The collector of Q7 is connected to one end of R11 and the base of Q8 through R12. The emitter of Q8 is connected to the other end of R11 and then connected to the power supply terminal. The collector of Q8 is connected to the ground terminal through R14. The collector of Q8 serves as the output end of the signal output circuit.

[0042] In the normal working state, the human body induction and detection circuit outputs a low level. The base of Q7 is at a low level, Q7 does not conduct, the base of Q8 is at a high level, Q8 conducts, and the signal output circuit outputs a high-level signal; when a human touches or a human is in the non-contact induction area, the human body induction and detection circuit outputs a high level, Q7 conducts, the base of Q8 is at a low level, Q8 cuts off, and the signal output circuit outputs a low-level signal.

[0043] As Figure 2 shown, the secondary voltage stabilization circuit includes transistors Q1, Q2, Q3, resistors R1, R2, R3, R4. The collector of Q1 and one end of R3 are connected as the power supply terminal. The emitter of Q1 is connected to one end of R1 and then connected to the first power supply terminal. The base of Q1 is connected to the collector of Q2 through R2. The base of Q2 is connected to the collector of Q3 and the other end of R1. The emitter of Q2, the emitter of Q3, and one end of R4 are connected to the ground terminal. The base of Q3 is connected to the other end of R4 and the other end of R3. A capacitor can be connected in series between the collector of Q1 and the ground terminal.

[0044] As Figure 2As shown, the first-level voltage stabilizing circuit includes transistors Q9, Q10, Q11, resistors R15, R16, R17, R18. The collector of Q9 and one end of R17 are connected as the first power supply terminal. The emitter of Q9 is connected to one end of R15 and then to the second power supply terminal. The base of Q9 is connected to the collector of Q10 via R16. The base of Q10 is connected to the collector of Q11 and the other end of R15. The emitter of Q10, the emitter of Q11, and one end of R18 are connected to the ground terminal. The base of Q11 is connected to the other end of R18 and the other end of R17. A capacitor can be connected in series between the collector of Q9 and the ground terminal.

[0045] Both the first-level voltage stabilizing circuit and the second-level voltage stabilizing circuit have the function of preventing reverse connection of the power supply.

[0046] The above are the preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the functions and effects produced do not exceed the scope of the technical solution of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A working method of a touch or non-contact sensing circuit, characterized in that The touch or non-contact sensing circuit includes a high-frequency signal generator circuit for generating a high-frequency square-wave-like signal, a human body sensing and detection circuit for realizing human touch or non-contact sensing and for detecting the high-frequency signal emitted by the high-frequency signal generator circuit, and a signal output circuit for realizing control signal output. In the normal working state, the high-frequency square-wave-like signal generated by the high-frequency signal generator circuit is detected and output to the signal output circuit through the human body sensing and detection circuit, so that the signal output circuit outputs a low / high level signal. When a human body touches or is in the non-contact sensing area, the human body touch or non-contact sensing signal is detected through the human body sensing and detection circuit, realizing the blocking effect on the high-frequency square-wave-like signal, so that the signal output circuit outputs a high / low level signal; The high-frequency signal generator circuit includes resistors R5, R6, R7, R8, capacitors C1, C2, C9, and transistors Q4, Q5. One ends of R5, R6, R7, R8 are connected to the power supply terminal. The other end of R5 is connected to one end of C1 and the collector of Q4. The other end of R6 is connected to the other end of C1 and the base of Q5. The other end of R7 is connected to one end of C2 and the base of Q4. The other end of R8 is connected to the other end of C2 and the collector of Q5, and serves as the output terminal of the high-frequency signal generator circuit. The emitters of Q4 and Q5 are connected to the ground terminal; The human body sensing and detection circuit includes diodes D1, D2, D3, resistors R9, R10, R15, capacitors C3, C4, C5, a transistor Q6, and sensing contacts CM1, CM2. The cathode of D1 is connected to the anode of D2, CM2, and one end of C4. The anode of D1 is connected to one end of R15, one end of C5, and the emitter of Q6 and is connected to the ground terminal. The cathode of D2 is connected to the other end of C5 and one end of R9. The other end of R9 is connected to the base of Q6. The collector of Q6 is connected to the power supply terminal through R10. The collector of Q6 is connected to the signal output circuit. The cathode of D3 is connected to the first power supply terminal. The anode of D3 is connected to the other end of C4, the other end of R15, CM1, and one end of C3. The other end of C3 is connected to the high-frequency signal generator circuit; The signal output circuit includes transistors Q7, Q8, resistors R11, R12, R14. The base of Q7 serves as the input terminal of the signal output circuit. The emitter of Q7 is connected to the ground terminal. The collector of Q7 is connected to one end of R11 and the base of Q8 through R12. The emitter of Q8 is connected to the other end of R11 and is connected to the power supply terminal. The collector of Q8 is connected to the ground terminal through R14. The collector of Q8 serves as the output terminal of the signal output circuit; It also includes a first and second stage voltage stabilizing circuit, which includes transistors Q1, Q2, Q3, resistors R1, R2, R3, R4. The collector of Q1 and one end of R3 are connected as the power supply terminal. The emitter of Q1 and one end of R1 are connected to the first power supply terminal. The base of Q1 is connected to the collector of Q2 via R2. The base of Q2 is connected to the collector of Q3 and the other end of R1. The emitter of Q2, the emitter of Q3 and one end of R4 are connected to the ground terminal. The base of Q3 is connected to the other end of R4 and the other end of R3. The working method of the touch or non-contact induction circuit is realized as follows: In the normal working state, that is, when there is no human touch or no human is in the non-contact induction area, the high-frequency square wave-like signal generated by the high-frequency signal generator circuit is output as a high-level signal to Q6 through the detection circuit composed of D1, D2, and C5 in the human body induction and detection circuit, making Q6 conduct, and thus outputting a low-level signal. When a human touches or a human is in the non-contact induction area, there are two situations: First, since the clutter signal in the air received by the human body is stronger than the high-frequency square wave-like signal generated by the high-frequency signal generator circuit, the high-frequency square wave-like signal is blocked. The DC signal of the clutter signal in the air received by the human body is blocked by C4, making the base of Q6 at a low level, and Q6 is cut off, thus outputting a high-level signal. Second, the high-frequency square wave-like signal generated by the high-frequency signal generator circuit discharges through the human body, so that there is no signal in the subsequent circuit, making the base of Q6 at a low level, and Q6 is cut off, thus outputting a high-level signal.

2. The working method of a touch or non-contact induction circuit according to claim 1, characterized in that, It also includes a first stage voltage stabilizing circuit, which includes transistors Q9, Q10, Q11, resistors R15, R16, R17, R18. The collector of Q9 and one end of R17 are connected as the first power supply terminal. The emitter of Q9 and one end of R15 are connected to the second power supply terminal. The base of Q9 is connected to the collector of Q10 via R16. The base of Q10 is connected to the collector of Q11 and the other end of R15. The emitter of Q10, the emitter of Q11 and one end of R18 are connected to the ground terminal. The base of Q11 is connected to the other end of R18 and the other end of R17.

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