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Alternating current sampling circuit

A technology of AC sampling and AC voltage, which is applied in the field of power electronics, can solve the problems of small AC voltage or AC current sampling range, large sampling error, and low sampling accuracy, and achieve improved sampling range, high accuracy, and strong anti-interference ability Effect

Pending Publication Date: 2018-12-21
KUNSHAN TYSEN KLD PHOTOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems of small AC voltage or AC current sampling range, large sampling error and low sampling accuracy, the present invention proposes an AC sampling circuit

Method used

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Examples

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Embodiment 1

[0020] like figure 1 As shown, an AC sampling circuit includes a wide-range voltage conversion circuit for converting a wide-range AC voltage from an AC input into a small-range AC current and then a small-range AC voltage, and is used for converting a small-range AC voltage into a small-range AC voltage. A rectification and lifting circuit for a certain range of DC voltage, a voltage amplification circuit for amplifying the DC voltage in phase and outputting a sampling voltage, a delay filter follower circuit for delaying, filtering and following processing of the sampling voltage, and a circuit for sampling An output protection circuit for voltage output protection processing and a voltage output connected to the output terminal of the output protection circuit.

[0021] The wide voltage conversion circuit is used to convert the wide-range AC voltage from the AC input Ui into a small-range AC current and then into a small-range AC voltage to increase the sampling range of th...

Embodiment 2

[0035] The above-mentioned embodiment 1 is an AC sampling circuit whose AC input is AC voltage, and this embodiment 2 is based on the AC sampling circuit whose AC input is AC voltage, and the above-mentioned voltage transformer T1 is replaced by a current transformer T11, Formed an AC sampling circuit whose AC input is AC current, see figure 2 , if the transformation ratio of the current transformer is n:m, and the AC current i is input, the range of the output voltage U can be calculated as:

[0036] To sum up, the present invention proposes an AC sampling circuit, including AC input, wide voltage conversion circuit, rectification and lifting circuit, voltage amplification circuit, delay circuit, filter circuit, follower circuit, output protection circuit and voltage output. First, the wide-range AC voltage or wide-range AC current input by the AC input is converted into a small-range AC current through a wide-range voltage conversion circuit, and then converted into a sma...

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PUM

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Abstract

The invention discloses an alternating current sampling circuit. The alternating current sampling circuit comprises an alternating current input, a wide voltage conversion circuit, a rectifier uplifting circuit, a voltage amplifier circuit, a delay filter follower circuit, an output protection circuit and a voltage output. The wide voltage conversion circuit converts a wide-range alternating current voltage or alternating current of the alternating current input into a narrow-range alternating current and then converts the narrow-range alternating current into a narrow-range alternating current voltage; the rectifier uplifting circuit converts the narrow-range alternating current voltage into a direct current voltage in a certain range and then puts the direct current voltage into the voltage amplifier circuit; the voltage amplifier circuit conducts in-phase amplification on the direct current voltage and outputs a sampling voltage, and the sampling range of the alternating current voltage is widened; and the accuracy and stability of the precision of the sampling voltage are guaranteed through the delay filter follower circuit and the output protection circuit. The alternating current sampling circuit has the advantages of being simple in circuit connection, high in anti-jamming capacity, wide in voltage input range, good in stability, high in precision, adjustable in voltageoutput range and the like.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an AC sampling circuit. Background technique [0002] Since the direction and amplitude of the AC voltage change with time, the high voltage value is usually directly converted to a low voltage value when sampling the AC voltage. The AC voltage sampling range is small, and the AC voltage and phase are sampled at the same time, resulting in The AC voltage error is large. And after the AC voltage is rectified by the rectifier diode, with the method of zero-crossing detection AC voltage and phase sampling, a large load needs to be connected after rectification, and the voltage drop of the rectifier diode will cause the voltage to fail to reach the zero point after rectification, making the AC voltage sampling The accuracy is reduced. Contents of the invention [0003] In order to solve the technical problems of small AC voltage or AC current sampling range, large sampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 王安羽陈子栋
Owner KUNSHAN TYSEN KLD PHOTOELECTRIC TECH
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