A human touch detection circuit
A touch detection, human body technology, applied in the field of electricity, can solve problems such as unsatisfactory stability and practicability, weak anti-interference ability, etc., to achieve the effect of eliminating environmental impact, strong anti-interference ability, and stable work
Inactive Publication Date: 2011-12-14
SHANGHAI FENGXIN MICROELECTRONICS
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Problems solved by technology
[0003] The purpose of the present invention is to provide a human body touch detection circuit. The human body touch detection circuit described in the prior art needs to solve the problem that the active inductive human body touch detection circuit in the prior art is easily affected by natural environments such as weather and humidity, and has weak anti-interference ability. , technical issues with unsatisfactory stability and practicality
Method used
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Embodiment 1
[0012] Such as figure 1 As shown, a human body touch detection circuit of the present invention consists of a first oscillating circuit 1, a second oscillating circuit 2, a timing control circuit 3, a counter 4, a first register 5, a second register 6, a The third register 7 and a comparator 8 are formed, and the timing control circuit 3 is provided with a clock signal input terminal clk1, a power-on reset terminal POR, a comparison control terminal CB, a first register latch terminal L1, A second register latch terminal L2, a third register latch terminal L3 and a counter reset terminal R, the counter 4 is provided with a clock signal input terminal clk2, an output terminal and a reset signal terminal R, wherein , the signal input terminal of the first oscillation circuit 1 is connected to one end of a first resistor R1 and one end of a first capacitor C1, the other end of the first resistor R1 is a power supply terminal vdd, the The other end of the first capacitor C1 is th...
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A human body touch detection circuit is composed of a first oscillating circuit, a second oscillating circuit, a timing control circuit, a counter, a first register, a second register, a third register and a comparator, the first The oscillating circuit, the first resistor, and the first capacitor work in the same environment as the second oscillating circuit, the second resistor, and the second capacitor. When the human body is in contact with the human body touch terminal connected to the second oscillating circuit, due to the The ground has parasitic capacitance, thus changing the frequency of the second oscillator circuit. The digital circuit composed of timing control circuit, counter, register and comparator accurately judges whether the human body touches the human body touch terminal according to the frequency difference of the output signal of the second oscillating circuit before and after the human body touches. The invention can eliminate environmental impact, has strong anti-interference ability and works stably.
Description
Technical field: [0001] The invention relates to the field of electricity, in particular to a digital circuit, in particular to a human body touch detection circuit. Background technique: [0002] In the prior art, a large number of electrical devices use a human body touch detection circuit as a detection switch device. The traditional active-sensing human touch detection circuit consists of an RC oscillator and a shaping circuit. One end of the RC oscillator is grounded. Under normal conditions, the RC oscillator periodically outputs low-level signals and high-level signals to the shaping circuit. The shaping circuit The output terminal generates a periodic pulse signal including high and low level signals. When the human body touches the node between the resistor and the capacitor in the RC oscillator, since the human body has a certain capacitance to the ground, properly designing the values of R and C can make the RC oscillator output a low-level signal all the time,...
Claims
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IPC IPC(8): H03K17/96
Inventor 张怀东
Owner SHANGHAI FENGXIN MICROELECTRONICS