Method and device for converting small-amplitude alternating-current signal into direct-current signal

A technology of AC signal and DC signal, applied in the field of weak signal processing, can solve the problem that the diode voltage drop cannot convert small-amplitude signals, etc., and achieve the effect of simple structure

Inactive Publication Date: 2015-05-27
XIAN DINGZI ELECTRONICS INFORMATION SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the di

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  • Method and device for converting small-amplitude alternating-current signal into direct-current signal

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Embodiment Construction

[0015] figure 1 It is a structural block diagram of a small-amplitude AC signal to DC signal conversion device, including a zero-crossing comparator 1, a switch switching circuit 2, a processor 3 and a rectification filter circuit 4, and a small-amplitude AC signal is input to the zero-crossing comparator 1 And the switch switching circuit 2, the zero-crossing comparator 1 outputs to the processor 3, the switch switching circuit 2 is controlled by the processor 3, and the output signal of the switch switching circuit 2 enters the rectification and filtering circuit 4 for output.

[0016] Use the zero-crossing comparator 1 to detect whether the small-amplitude AC signal is currently positive or negative. If the small-amplitude AC signal is currently positive, the zero-crossing comparator 1 outputs a high-level signal, and the processor 3 detects the zero-crossing comparator 1 output. The high-level signal of the control switch switching circuit 2; if the small-amplitude AC sign...

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Abstract

The invention belongs to the technical field of weak signal processing, and specifically provides a method and a device for converting a small-amplitude alternating-current signal into a direct-current signal. The device comprises a zero-crossing comparator (1), a switch switching circuit (2), a processor (3) and a rectifying and filtering circuit (4). The method comprises the following steps that: when the small-amplitude alternating-current signal is in a positive half cycle or a negative half cycle at present, the zero-crossing comparator (1) correspondingly outputs a high level or a low level; the processor (3) detects a level signal output by the zero-crossing comparator (1); and the switch switching circuit (2) is controlled to overturn the negative half cycle of the small-amplitude alternating-current signal in order to convert the small-amplitude alternating-current signal into the direct-current signal. The device is simple in structure; very weak alternating-current signals can be processed; and the problem of signal distortion is solved.

Description

technical field [0001] The invention belongs to the technical field of weak signal processing, and specifically provides a method and device for converting small-amplitude AC signals to DC signals. The invention has a simple structure and can process very weak AC signals without signal distortion question. Background technique [0002] In the process of AC signal processing, the effective value of the AC signal is a very important parameter of the calibration signal, so the measurement of the effective value of the AC signal is also a very important part of the signal measurement. [0003] The method of measuring the effective value of the AC signal in the current circuit is generally to use a full-wave rectification circuit to obtain the average value of the AC signal, and then calculate the effective value through the relationship between the average value and the effective value. In these full-wave rectification circuits Diodes are inevitably used, because diodes have un...

Claims

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Application Information

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IPC IPC(8): H03K19/0175
Inventor 石强
Owner XIAN DINGZI ELECTRONICS INFORMATION SCI & TECH
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