Directly tandem high-voltage impulse power supply for insulation detection

Abstract

The invention discloses a direct series high-voltage pulse power source for insulation test. The high-voltage pulse power source is characterized in that power supply outputs of a plurality of electrically isolated AC / DC DC power sources are respectively connected with power supply input terminals of the corresponding single-phase full bridge inverters; or the AC / DC DC power supply outputs are connected in parallel with a plurality of inputs of electrically isolated DC / DC DC power sources, outputs of a plurality of DC / DC DC power sources are electrically isolated from each other, and the output of each DC / DC DC power source is connected with the power supply input terminal of the corresponding single-phase full bridge inverter. An output of an inverter control system is connected with the input of an inverter driver, and the inverter driver is provided with a plurality of sets of electrically isolated outputs which are connected with control terminals of the corresponding single-phase full bridge inverter respectively. The power supply output terminals of a plurality of single-phase full bridge inverters are sequentially connected in series. The pulse power source can generate high-voltage pulses with adjustable amplitude and frequency, and the pulse voltage rising edge is steep.

Description

technical field [0001] The invention relates to a pulse power supply, in particular to a high-voltage pulse power supply for insulation detection. Background technique [0002] The insulation performance of transformers and motors directly affects their service life, so their insulation performance must be inspected and tested during R&D and production. Due to the working characteristics of transformers and motors, it is necessary to use high-voltage pulses with high rising rates and steep edges to speed up the testing process. There are two kinds of pulse power commonly used in insulation testing: 1. A full-bridge inverter composed of high-speed high-voltage switching devices is used to generate pulse voltage and then output it directly. Due to the limitation of the voltage level of the switching devices of the inverter, this method cannot output a very high voltage; if multiple switching devices are directly connected in series, it will cause a difficult problem of voltag...

AI Technical Summary

Problems solved by technology

However, since the primary and secondary stages of the transformer have leakage inductance, and the test sample is capacitive, it is difficult to output a pulse waveform with a steep rising edge. At the same time, the transmission signal of a pulse transformer is limited by the frequency range, and pulse signals of different frequencies have different requirements. the transformer

In the insulation test, the frequency range of the pulse is very wide, so multiple transformers are required, which not only increases the cost of the design, but also brings a lot of inconvenience to the use.

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