Current and frequency sampling circuit for automatic power supply changeover system

A conversion system and frequency sampling technology, applied in the direction of voltage/current isolation, current/voltage measurement, current only measurement, etc., can solve problems such as easy oscillation, easy missing or multiple detection, poor anti-interference ability, etc.

Pending Publication Date: 2020-10-23
上海亿盟电气自动化技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Poor anti-interference ability of current sampling waveform;
[0005] 2) It is easy to generate oscillation;
[0006] 3) The frequency output ripple is

Method used

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  • Current and frequency sampling circuit for automatic power supply changeover system
  • Current and frequency sampling circuit for automatic power supply changeover system

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Embodiment

[0028] Such as figure 2 As shown, the present invention provides a current and frequency sampling circuit for an automatic power conversion system, which is used for the power conversion system to sample the current and frequency of the detection load, including a transformer PT1 connected in sequence, a sampling module, a current detection module and a frequency The detection module is connected with the input capture port of the MCU.

[0029] The current detection module includes a first operational amplifier U1, a first capacitor C2 and a feedback resistor R7, the output terminal of the first operational amplifier U1 is connected to the negative input terminal through the first capacitor C2 and the feedback resistor R7 connected in parallel with each other, and the first operation The output terminal of the amplifier U1 is respectively connected to the ADC port of the MCU and the input terminal of the voltage comparator unit through the first resistor R8, and the negative ...

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PUM

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Abstract

The invention relates to a current and frequency sampling circuit for an automatic power supply changeover system. The circuit is used for realizing sampling of the current and frequency of a detection load by the power supply changeover system. The circuit comprises a mutual inductor, a sampling module, a current detection module and a frequency detection module which are connected in sequence, wherein the frequency detection module is connected with an input capture port of an MCU. The circuit is characterized in that the frequency detection module comprises a voltage comparator unit and a gate circuit unit which are connected with each other, wherein the input end of the voltage comparator unit is separately connected with a voltage reference and the current detection module, and the output end of the voltage comparator unit is connected with the input capture port of the MCU through the gate circuit unit. Compared with the prior art, the circuit has the advantages of strong anti-interference capability, small frequency output ripple, high sampling precision and the like.

Description

technical field [0001] The invention relates to a sampling circuit, in particular to a current and frequency sampling circuit for an automatic power conversion system. Background technique [0002] With the development of the electric power industry, electrical equipment has higher and higher requirements for the continuity and reliability of the power supply. Good signal acquisition technology can minimize the misjudgment rate of the control system output and improve the reliability of the system at the same time. The controller can detect the situation of the electrical equipment in real time, and when it deviates from the set normal state, it can reflect and make adjustments in time. [0003] Such as figure 1 As shown, in the existing sampling circuit, the current is generally directly connected to the differential amplifier after passing through the transformer, and the frequency detection is generally output to the MCU directly only through a voltage comparator. This ...

Claims

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Application Information

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IPC IPC(8): G01R15/18G01R23/02G01R19/00
CPCG01R15/18G01R19/0092G01R23/02
Inventor 代智尚劲
Owner 上海亿盟电气自动化技术有限公司
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