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Method of discrete digit constant energy wave chopping and current transformation

A constant energy, digital technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc., can solve the problem of difficulty in coordinating the chopping power, chopping frequency and device stress, slow progress and reliable. The performance requirements are not too high, so as to achieve the effect of improving the system design scope and comprehensive performance indicators

Inactive Publication Date: 2010-05-12
KUNMING UNIV OF SCI & TECH
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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 an in-depth study of the existing problems and solutions to the problems in the prior art, it is not difficult to find that because of the switching loss problem that is difficult to coordinate and solve in the working mode of voltage chopping, any The actual application system also has the same problem without exception

Method used

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  • Method of discrete digit constant energy wave chopping and current transformation
  • Method of discrete digit constant energy wave chopping and current transformation
  • Method of discrete digit constant energy wave chopping and current transformation

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Embodiment Construction

[0019] 1. Composition of constant energy power pulse forming circuit

[0020] The structure of the constant energy pulse forming circuit is divided into half-bridge asynchronous type and full-bridge synchronous type. The half-bridge circuit only needs two switching elements and has a simple structure, but the transmission of each pulse energy needs to be divided into two steps. Therefore, the chopping frequency and output power are relatively low; while the full bridge circuit requires four switching elements, but the transmission of each pulse energy can be completed in one step, so the chopping frequency and output power are relatively low. Higher, the scope of application should be larger.

[0021] 1. The composition of the half-bridge asynchronous constant energy pulse forming circuit

[0022] Circuit structure such as figure 1 As shown in the dotted line box in (a), the entire pulse forming circuit is composed of one-way thyristors S1, S2, resonant reactances L1, L2, re...

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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 currentengine 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 flow methods in terms of speed, etc. Background technique [0002] In the prior art, several modulation methods such as PAM (Pulse Amplitude Modulation), PWM (Pulse Width Modulation) and Space Vector Modulation, which are most widely used in current conversion technology, are all based on voltage chopping 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 per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00
Inventor 卢诚邵剑龙谢实何春金建辉
Owner KUNMING UNIV OF SCI & TECH
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