Method for preventing failure false detection, AD detection circuit and electronic device
A detection circuit and false detection technology, which is applied in the field of AD detection, can solve the problems of AD detection circuit failure and false detection, and achieve the effect of preventing failure and false detection and improving safety
Active Publication Date: 2019-03-15
深圳和而泰小家电智能科技有限公司
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[0005] The embodiment of the present invention aims to provide a method for preventing failure and false detection, AD detection circuit and electronic equipment, which solves the technical problem of failure and false detection of AD detection circuit
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[0060] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0061] In order to facilitate the understanding of the purpose of the embodiment of the present invention, the embodiment of the present invention makes a detailed description of the working principle of the capacitor charging / discharging involved. It should be understood that the following description is not intended to limit the scope of protection of the embodiment of the present invention.
[0062] see figure 2 , figure 2 It is a schematic circuit structure diagram of an AD detection circuit provided by an embodiment of the present invention. The AD detection circuit 100 includes a processi...
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The invention relates to the field of AD detection, in particular to a method for preventing failure false detection, an AD detection circuit and an electronic device. The AD detection circuit includes a processing unit including a first port and an internal pull-up resistor, the first port includes an I / O state and an AD detection state, one end of the internal pull-up resistor is connected to apower supply, and the other end of the internal pull-up resistor is connected to the first port. Based on which, the method for preventing the failure false detection includes the steps that after power-on, the state of the first port is set in the I / O state, and the power supply charges a charging capacitor through the internal pull-up resistor; when the voltage across the charging capacitor is equal to the power supply voltage, the state of the first port is set in the AD detection state, and the AD voltage value is acquired; the AD voltage value of at least one cycle is obtained; whether the AD voltage value is equal to the power supply voltage is judged; if yes, the AD detection circuit is detected to be in an abnormal state; if not, it is detected that the AD detection circuit is operated in a normal state. The method can prevent the failure false detection of the AD detection circuit and improve the safety.
Description
technical field [0001] The invention relates to the technical field of AD detection, in particular to a method for preventing failure and false detection, an AD detection circuit and electronic equipment. Background technique [0002] At present, most AD detection circuits collect voltage through resistor division. Since the AD collection port is very susceptible to interference, when the circuit fails, the state of the AD collection port is unstable, resulting in errors in detection data, especially in temperature detection. It may even have serious consequences. [0003] see figure 1 , figure 1 It is a schematic circuit structure diagram of an AD detection circuit provided in the prior art. like figure 1 As shown, the voltage value of the voltage divider circuit composed of resistor R2 and resistor R3 is collected through the AD acquisition port of the MCU. Because the circuit is unstable and easily affected by noise, the collected data is inaccurate. Therefore, the re...
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IPC IPC(8): G01K7/24G01D3/036
CPCG01D3/036G01K7/24
Inventor 石鸾彭原
Owner 深圳和而泰小家电智能科技有限公司