A Virtual Power Control Method for Realizing Minimal Current Stress in Buck Conversion Mode of Full-Bridge Isolated DC-DC Converter
A technology of virtual power and current stress, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc. It can solve complex calculations, increase load current sensors, and inductance parameter dependence. Achieve the effect of reducing hardware design cost, reducing computing cost and improving stability
Active Publication Date: 2017-07-11
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
However, these minimum current stress optimization control algorithms require more complex calculations, and compared with traditional phase shift control, they need to increase the load current sensor and have a dependence on the inductance parameter
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[0032] figure 1 A block diagram of a control system of a virtual power control method for realizing the minimum current stress in a step-down conversion mode of a full-bridge isolated DC-DC converter is shown. The whole system can be divided into five parts: theoretical optimization calculation module 01, data acquisition module 02, voltage outer loop PI module 03, control quantity calculation module 04 and modulation module 05. The specific contents of the main parts are:
[0033] (1) Theoretical optimization calculation module
[0034] In order to obtain the minimum current stress control, the theoretical calculation is carried out to obtain the phase shift control amount D 1 and D 2 The relationship between and the subsection of the virtual power, and further obtain the phase shift control amount D 1 and D 2 The expression of the given amount P* with the virtual power in each solution set interval
[0035] (2) Control quantity calculation module
[0036] The input vo...
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The invention discloses a virtual power control method for realizing the minimum current stress in the step-down conversion mode of a full-bridge isolated DC-DC converter. The phase shift control amount D1 is obtained by obtaining the relationship between the phase shift control amounts D1 and D2 and fitting the linear endpoints. and D2 with the change relationship of the virtual power given P*, and then the switch control signal is obtained by the modulation module to realize the control of the full-bridge isolated DC-DC converter, and the calculation complexity of the minimum current stress control algorithm is reduced by the virtual power control method degree, eliminating load current sensors, and implementing control algorithms that do not depend on inductance parameters.
Description
technical field [0001] The invention relates to the field of control system design and manufacture of full-bridge isolated DC-DC converters (including half-bridge three-level and full-bridge isolated DC-DC converters). Background technique [0002] With the rapid development of new energy conversion technology, full-bridge isolated DC-DC converters have been widely used due to their advantages of electrical isolation, high power density, bidirectional energy flow and easy module cascading. In distributed power generation systems such as photovoltaic power generation and wind power generation, full-bridge isolated DC-DC converters can be used to solve problems such as energy storage and power flow balance. In recent years, with the development of the economy and the emergence of environmental problems, the full-bridge isolated DC-DC converter has also become a commonly used converter topology in electric vehicles. [0003] In the application of full-bridge isolated DC-DC con...
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IPC IPC(8): H02M3/335
CPCH02M3/33553
Inventor 宋文胜侯聂武明义葛兴来冯晓云王青元熊成林
Owner SOUTHWEST JIAOTONG UNIV