Alternating signal sampling device and implementation method thereof

Abstract

The invention discloses an alternating signal sampling device and an implementation method of the alternating signal sampling device. The alternating signal sampling device comprises a rectifier bridge and a processor, wherein the rectifier bridge is connected with an input alternating signal, and the processor is connected with the alternating signal and the rectifier bridge. The processor comprises an analog-to-digital converter (ADC) module, a comparator and a central processing unit (CPU), wherein the ADC module is connected with the rectifier bridge, the comparator is connected with the alternating signal, and the CPU is connected with the ADC module and the comparator. The rectifier bridge is used for rectifying the alternating signal into a full-wave rectified signal containing positive voltage. The comparator is used for outputting corresponding high level and low level according to the positive voltage and the negative voltage of the alternating signal. The ADC module is used for converting the full-wave rectified signal into a digital quantity full-wave rectified signal and sampling the digital quantity full-wave rectified signal to generate a corresponding sampling value. The CPU is used for conducting sign bit processing on the sampling value according to the high level and the low level to obtain the original alternating signal. Through the rectifier bridge and the comparator in the processor, the purpose of collecting alternating signals is achieved, and power consumption and cost are lowered.

Description

technical field [0001] The invention relates to the field of AC signal sampling, in particular to an AC signal sampling device and an implementation method thereof. Background technique [0002] Analog-to-digital converter, referred to as ADC in English, is a very important device in modern digital circuits, which is responsible for converting analog signals into digital signals. At present, almost all processors integrate ADC inside the chip. The MSP430 chip produced by TI has relatively low power consumption, can work for several months or even years under battery-powered conditions, and has excellent performance-to-power ratio. Moreover, an ADC module optimized for low power consumption is integrated in the MSP430 chip. According to different models, the ADC specifications are also different, but basically they all have a resolution of 10 to 12 bits, a maximum sampling rate of several hundred ksps, and multiple single input channel. But it has an inherent defect, tha...

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Problems solved by technology

like figure 1 As shown, the bias circuit is generally composed of an operational amplifier. An AC signal is added to Vin, and the maximum value of the AC signal V+ is added to V+. The output signal is a signal without negative voltage. The current consumption of the operational amplifier needs at least several milliseconds. An, this will offset the advantages of MSP430's ultra-low power consumption and power saving. Generally, the battery is only thousands of mAh. If an operational amplifier is used, the battery life will be greatly shortened.

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