Single-polarity AD sampling and conditioning circuit
A sampling conditioning circuit, unipolar technology, applied in pulse shaping and other directions, can solve the problems of high price and complex structure, and achieve the effect of saving hardware cost, improving conditioning accuracy and reducing quantity
Active Publication Date: 2016-02-10
ZHUHAI WANLIDA ELECTRICAL AUTOMATION
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Problems solved by technology
At present, the existing analog-to-digital (AD) converters are divided into unipolar analog-to-digital converters and bipolar analog-to-digital converters. The digital converter has a relatively complex structure and is more expensive
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[0016] 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.
[0017] Such as figure 2 and image 3 as shown in:
[0018] The embodiment of the present invention provides a unipolar AD sampling conditioning circuit, including a reference voltage generation circuit 1, a voltage follower circuit 2, a filter circuit 3 and a voltage-current conversion circuit 4; the reference voltage generation circuit 1, voltage follower circuit 2 It is sequentially connected to the filter circuit 3, and the input terminal of the reference voltage generating circuit 1 is connected to input a reference voltage; the voltage-current conversion circuit 4 includes more than one cur...
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The invention provides a single-polarity AD sampling and conditioning circuit. The single-polarity AD sampling and conditioning circuit includes a reference voltage generation circuit, a voltage following circuit, a filter circuit, and a voltage and current conversion circuit; the reference voltage generation circuit, the voltage following circuit, and the filter circuit are successively conductively connected, and an input end of the reference voltage generation circuit is connected to and inputs a reference voltage; the voltage and current conversion circuit includes more than one current transformers and more than one voltage transformers, wherein each current transformer and each voltage transformers are both provided with two input ends connected to an external strong electricity input current of a device, an output end connected to an output end of the filter circuit, and an analog quantity conditioning output end. According to the invention, multichannel bipolar analog signals can be simultaneously converted into single-polarity analog signals by adoption of the single-polarity AD sampling and conditioning circuit, and the number of electron components is greatly reduced, the cost is saved, the failure probability of the device is reduced, the device operates reliably, and errors among various channels are reduced.
Description
【Technical field】 [0001] The invention belongs to the technical field of analog-to-digital signal conversion, in particular to a unipolar AD sampling and conditioning circuit. 【Background technique】 [0002] At present, in power system relay protection equipment, power meters, industrial automation equipment and industrial automation control, most of them use digital processing and digital display, and very few use analog processing. However, the original signals of these devices (such as voltage, current, pressure, temperature, etc.) are continuously changing analog signals, so the continuously changing analog signals must be converted into digital signals before digital processing and digital display. [0003] The process of converting an analog signal into a digital signal is called analog-to-digital (AD) conversion, and the corresponding device is called an analog-to-digital (AD) converter. At present, the existing analog-to-digital (AD) converters are divided into unip...
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IPC IPC(8): H03K5/02
Inventor 李忠怀陈峻岭戴先兵徐洲
Owner ZHUHAI WANLIDA ELECTRICAL AUTOMATION