Topology and constant-frequency voltage hysteresis control of multi-level inverter

A multi-level inverter and hysteresis control technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as unfixed switching frequency, unpredictable duty cycle, and difficult to realize switching device drive

Inactive Publication Date: 2011-09-28
刘闯
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Problems solved by technology

However, the switching frequency of this control method is not fixed. When tracking the output voltage, if the load changes, the switching frequency will change accordingly, and the duty cycle of the switching device is unpredictable, and it is difficult to drive the switching device at high frequencies.

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  • Topology and constant-frequency voltage hysteresis control of multi-level inverter
  • Topology and constant-frequency voltage hysteresis control of multi-level inverter
  • Topology and constant-frequency voltage hysteresis control of multi-level inverter

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Embodiment Construction

[0050] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.

[0051] Such as Figure 11 , 12 As shown, the voltage hysteresis control of the DC / DC converter using the three-level inverter, Figure 11 For direct voltage hysteresis control, Figure 12 It is an indirect voltage hysteresis control. The three-level inverter used is composed of four switching devices anti-parallel fast diodes, and the switching device is S 1H , S 2H , S 1L , S 2L , the fast diodes connected in ...

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Abstract

The invention discloses topology and constant-frequency voltage hysteresis control of a multi-level inverter which has constant switching frequency and is based on a serial resonant soft switch. The multi-level inverter comprises a unidirectional multi-level inverter and a bidirectional multi-level inverter; a switch device is arranged on one side of the unidirectional multilevel inverter; a complementary conducting way is adopted in different resonant current directions in the same state; switch devices are arranged on both sides of the bidirectional multilevel inverter and are easy to control; the voltage hysteresis control comprises direct voltage hysteresis control and indirect voltages hysteresis control; in the direct voltage hysteresis control, output voltage is taken as a comparison object; and in the indirect hysteresis control, the output of a regulator is taken as a comparison object. Due to the adoption of the voltage hysteresis control based on the multi-level inverter, rapid and stable control over the output voltage can be realized; and the voltage hysteresis control can applied to a high-frequency DC / DC (Direct Current-Direct Current) converter.

Description

technical field [0001] The present invention relates to a topology and control method of a multi-level inverter in a DC / DC converter, in particular to a topology and voltage hysteresis of a multi-level inverter based on series resonant soft switching with constant switching frequency control. Background technique [0002] In recent years, with the wide application of a new generation of power devices (such as IGBT, MOSFET, etc.), the speed of the microprocessor has been further improved, and the high-frequency inverter technology has become more and more mature. In order to develop a new type of high-performance DC / DC converter creates the conditions. [0003] High frequency can make power electronic devices smaller and lighter, but at the same time, switching loss will also increase, power efficiency will seriously decrease, and electromagnetic interference will increase. Therefore, simply increasing the switching frequency is not enough. For ordinary DC / DC converters, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M3/335
Inventor 刘闯
Owner 刘闯
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