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Current sampling holding circuit

A technology for maintaining circuits and current sampling, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc.

Inactive Publication Date: 2013-09-25
ZHEJIANG WANMA HIZHEN OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]In the prior art, current sensors or analog switches are generally used for DC current sampling and holding, but the cost is high, and the application of sensors in current sampling have high technical requirements

Method used

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  • Current sampling holding circuit

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Embodiment Construction

[0014] The realization, functional characteristics and beneficial effects of the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0015] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention .

[0016] The embodiment of the present invention uses a MOS tube and a capacitor to form a sample and hold, and uses a combination of software and hardware. When there is current input (the load drive is turned on), the MOS tube is turned on, and then the collected signal is held by charging the capacitor. Finally, the hold signal is amplified by an operational amplifier and output to a microprocessor.

[0017] Such as figure 1 In the schematic diagra...

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Abstract

The invention discloses a current sampling holding circuit which comprises an MOS pipe, a capacitor, a plurality of resistors, an operational amplifier and a microprocessor, wherein one side of the first resistor is a current input sampling side, and the other side of the first resistor is connected with a source electrode of the MOS pipe; a gate electrode of the MOS pipe is connected to the microprocessor MCU through the second resistor to carry out sampling control signal output; a drain electrode of the MOS pipe is connected with the capacitor, holding of collected signals is achieved through charging of the capacitor, and at last holding signals are amplified through the operational amplifier and are outputted to the microprocessor. The current sampling holding circuit is low in cost, simple in structural element, and stable in operation.

Description

technical field [0001] The invention relates to a current sampling and holding circuit, which belongs to the current detection technology. Background technique [0002] In the prior art, a current sensor or an analog switch is generally used for current sampling and holding for DC current sampling, but the cost is high, and the application of the sensor in current sampling requires high technical requirements. [0003] MOS tube refers to the insulating field effect tube used to replace switches in integrated circuits. MOS tube has three poles: source S, drain D, and gate (or control electrode) G. The working principle is to provide the source After adding a voltage of correct polarity and size (varies with the tube type) between the drain and the drain, and then adding a control voltage between the G electrode and the source, there will be a current of corresponding magnitude flowing from the source to the drain , if the signal voltage is large enough, the circuit can satur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 王凤辉
Owner ZHEJIANG WANMA HIZHEN OPTOELECTRONICS TECH