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Boost type isolated DC/DC converter and control method thereof

A technology of converters and ideal transformers, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as large loss and increase in converter volume, and achieve wide and wide input voltage range Effect of Voltage Gain Range

Active Publication Date: 2014-07-23
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the added pre-stage converter not only increases the volume of the overall converter, but also the switching tube in the Buck or Boost converter is a hard switch, and the loss is relatively large.

Method used

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  • Boost type isolated DC/DC converter and control method thereof
  • Boost type isolated DC/DC converter and control method thereof
  • Boost type isolated DC/DC converter and control method thereof

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0035] A Boost type isolated DC / DC converter, its electrical schematic diagram is as follows figure 1 As shown, it is input by the DC voltage source V in , Bus capacitance C bus , the first inductance L 1 , the second inductance L 2 , the first switch tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , two-port passive network N, the first output rectifier diode D o1 , the second output rectifier diode D o2 , output capacitance C o , output resistance R o and the ideal transformer T;

[0036] The ideal transformer T includes a first winding N 1 , the second winding N 2 and the third winding N 3 ;

[0037] The two-port passive network N has four terminals, which are terminal a, terminal b, terminal c and terminal d respectively, terminal a and terminal b are on the same side, and termina...

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Abstract

The invention discloses a Boost type isolated DC / DC converter and a control method of the Boost type isolated DC / DC converter. The Boost type isolated DC / DC converter is composed of a primary side circuit, an auxiliary side circuit, an ideal transformer and a two-port passive network, wherein the primary side circuit is composed of a full-bridge unit circuit where interleaved Boost circuits are integrated, the auxiliary side circuit is composed of a rectifying circuit, the two-port passive circuit is composed of an inductor and a capacitor and is an energy transmitting unit, and the transformer is used for achieving isolation and transformation. Two interleaved Boost input inductors are connected in the middles of two bridge arms of the full-bridge unit circuit, and therefore the gain range of the isolated DC / DC converter is widened, and input current ripples are reduced; frequency-fixed PWM control is adopted, the duty ratio D of a bridge arm switching tube is controlled, and therefore the output voltage can be adjusted. The Boost type isolated DC / DC converter and the control method have the advantages of being wide in input voltage range, small in input current ripple, fixed in switching frequency, capable of allowing soft switching to be achieved, small in switching loss and the like, and are particularly suitable for renewable energy power generation systems and other systems.

Description

technical field [0001] The invention relates to the technical field of power electronic converters in renewable power generation systems, in particular to a Boost type isolated DC / DC converter and a control method thereof. Background technique [0002] With the development of the economy, the problems of environmental pollution and energy shortage are becoming more and more serious. The development and utilization of renewable energy is one of the effective ways to solve this problem. Renewable energy power generation mainly includes wind power, photovoltaics, water conservancy, fuel cells, etc. However, affected by climate conditions, renewable energy has the characteristics of a wide output voltage range. Therefore, in order to effectively utilize new energy sources, a DC / DC converter capable of operating efficiently within a wide input voltage range is required. [0003] Although the traditional fixed-frequency control full-bridge converter is simple to control and can ...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/14
CPCY02B70/10
Inventor 孙孝峰申彦峰朱云娥李昕
Owner YANSHAN UNIV
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