Mother technique of discrete digit constant energy wave chopping and current transformation

Abstract

The invention is a kind of converting mother technology applicable DC / DC step-up and step-down transform, high frequency electric welding, high frequency sensing and heating, brushless direct current engine speed regulation, switch magnetic resistance engine power transform and alternate sensing engine speed-regulation. The main merits are: 1. the application system based on the technology can work in natural zero switch state and has no switch consumption problem; 2. the power element uses the semi-controlled device and it can work without any additional relating circuit; 3. the two or more subsystems with small power, low frequency can be integrated into a larger system with a higher chopping frequency, a larger output power.

Description

technical field [0001] The invention belongs to the category of electric power electronic conversion technology, and relates to a DC-DC buck-boost conversion, high-frequency electric welding, high-frequency induction heating, brushless DC motor speed regulation, switched reluctance motor power conversion and AC induction motor regulation. Variable current mother technology in terms of speed and so on. Background technique [0002] In the existing technology, the most widely used modulation methods such as PAM (Pulse Amplitude Modulation), PWM (Pulse Width Modulation) and Space Vector Modulation are all based on voltage chopping as the mother technology. . We know that the voltage chopping process must be completed through the state transition of the power switching device connected in series between the power supply and the load. Since the state transition of the switching device takes time, during the transition period, the switching device has to withstand a short period ...

AI Technical Summary

Problems solved by technology

So far, there have been 17 years of research on resonant soft switching technology, but the progress has been slow. So far, it can only be used in some low-power systems where the power supply voltage does not exceed 500V, the power is less than ten kilowatts, and the reliability requirements are not too high. application, the fundamental reason is that this resonant soft switching scheme is difficult to coordinate and solve the contradiction between the three interrelated and closely restricted parameters of chopping power, chopping frequency and device stress

In fact, after in-depth research on the problems and solutions of the existing technologies, it is not difficult to find that because the parent technology of voltage chopping has switching loss problems that are difficult to coordinate and solve, any technology based on voltage chopping The same problem exists in the actual application system on the Internet without exception. It can be considered that the "congenital disability" of the child technology is caused by the "congenital deficiency" of the parent technology.

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