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A DC high voltage isolation detection method

A detection method, DC high-voltage technology, applied in the direction of measuring current/voltage, measuring device, measuring only voltage, etc., can solve the problems of large size and high cost, and achieve the effect of convenient operation, good isolation and low cost

Active Publication Date: 2018-09-07
SHANGHAI JARI INFORAMTION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has high precision and is safe and reliable, but it is bulky and expensive

Method used

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  • A DC high voltage isolation detection method

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Embodiment Construction

[0022] The specific technical solutions of the present invention will be further described below with reference to the accompanying drawings, so that those skilled in the art can further understand the present invention, without limiting their rights.

[0023] refer to figure 1 , a DC high-voltage isolation detection method is provided with a flyback transformer, and the flyback transformer is composed of a primary excitation winding N1, a secondary detection winding N2 and a sampling winding N3; one end of the primary excitation winding N1 is connected to a DC power supply, and the other One end is connected to the main switching tube Q1, and the main switching tube Q1 is connected to the pulse drive unit 3. The DC voltage VCC is chopped into a pulse voltage through the main switching tube Q1 to realize the coupling of the flyback transformer. The two primary excitation windings N1 There is a primary-side clamping circuit for clamping the secondary reflected voltage of the tr...

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Abstract

The invention provides a DC high voltage isolation detection method. A flyback transformer is arranged, and the flyback transformer is composed of a primary excitation winding, a secondary detection winding and a sampling winding. One end of the primary excitation winding is connected with a DC power supply, and the other end is connected with a main switching tube which is connected with a pulse driving unit. DC voltage is converted into pulse voltage by the main switching tube through chopping so that coupling of the flyback transformer is realized. The two ends of the primary excitation winding are provided with a primary clamp circuit used for a clamp transformer secondary reflected voltage protection main switching tube. The two ends of the secondary detection winding are provided with a secondary detection circuit which is composed of a diode D1 and a capacitor C1. The two ends of the sampling winding are provided with a secondary rectification filtering circuit which is composed of a diode D2, a capacitor C2 and a resistor R2. The flyback transformer is arranged, and isolation, high-precision detection and low cost can be realized through winding of the flyback transformer and selection of the low-voltage-drop diodes.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a DC high voltage isolation detection method. Background technique [0002] In the field of power electronics, the sampling and detection of DC high-voltage output terminals, especially the kilovolt-level high voltage, has become a major problem in the industry. It is necessary to solve the problem of isolation between the high voltage of the output terminal and the low voltage of the control terminal, and to ensure the accuracy of sampling. If there is no isolation, the low voltage terminal is likely to be connected to high voltage interference, resulting in abnormal operation or even burning the circuit; the traditional isolation method is also limited by the isolation resistance of the device. Voltage limit cannot sample too high DC voltage. [0003] Traditional DC high voltage detection, commonly used methods are: [0004] 1. The resistor divides the voltage directly. This...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCG01R19/0084
Inventor 王廷营郝英杰孙涛肖化孙娟
Owner SHANGHAI JARI INFORAMTION SCI & TECH
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