Multistage power variable voltage system and control method thereof

Abstract

The invention discloses a multistage power variable voltage system and a control method thereof. The multistage power variable voltage system is technically characterized by comprising a power supplypart, a converter part, a multistage converter part, a spike voltage suppression part and load, wherein the multistage converter part receives three-phase voltage accessed from the power supply part,converts the three-phase voltage to DC voltage and outputs the DC voltage; the spike voltage suppression part is parallelly connected between the multistage converter part and the load; parallel resistors are formed between the multistage converter part and the load to reduce the spike voltage generated when the direction of current outputted to the load to be minimized. Due to the a multistage power variable voltage system and the control method thereof provided in the invention, the spike voltage can be controlled to prevent an insulated gate bipolar transistor inside the converter from being burnt down.

Description

technical field [0001] The present invention relates to a multi-stage power transformation system and its control method, more specifically to a multi-stage power transformation system capable of generating high-voltage and high-frequency power and its control method. Background technique [0002] Generally speaking, in order to produce high voltage for the power transformer device of industrial ozone generator, a transformer or low frequency converter and transformer are connected to the common power supply to generate high voltage. However, there is a problem that the amount of ozone generation is greatly limited because the frequency of the common power supply or the low-frequency converter is fixed and low. Because the material of some ozone discharge tubes is made by coating metal on the current glass tube to produce electrodes, the access frequency needs to be kept below 1kHz, but if the electrodes of the discharge tube are replaced with ceramic tubes, it needs to be a...

AI Technical Summary

Problems solved by technology

However, there is the following problem: because the frequency of the common power supply or the low-frequency converter is fixed and low, the amount of ozone generation is greatly limited.

Peak voltage (spike voltage) means that when the current flows from one end of the element to the other end in one direction and the current slowly flows in the opposite direction, the voltage difference between one end and the other end of the element respectively passes through two levels. Under normal circumstances, the voltage is only generated within the internal voltage range of the IGBT used, and will not exceed the rated voltage of the IGBT, but in the case of multiple stages, the voltage of the other stage increases together , the peak voltage exceeds its own rated voltage, thereby causing damage to the components. In a multi-level power transformation system, there is a peak voltage exceeding the internal pressure of the insulated gate bipolar mode transistor (insulated gate bipolar mode transistor). Burnout of IGBTs and Affected Output Voltage

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