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DC-DC converter

A technology of DC-DC and converter, applied in the field of DC-DC converter, can solve the problem of low switching frequency and achieve the effect of balanced control, simple topology and low cost

Inactive Publication Date: 2010-06-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, fully controlled devices such as insulated gate bipolar transistors (IGBT, Isolated Gate Bipolar Transistor), the withstand voltage is mostly below 3KV, and due to the IGBT current tailing, the switching frequency is low, less than 40Khz; and the metal oxide semiconductor field effect transistor (MOSFET, MetalOxideSemicoductor Field Effect Transistor) The withstand voltage is mostly below 1.2KV, so when low power high frequency, high voltage DC input such as 5KV is required, the traditional DC-DC converter and its control method cannot meet the needs

Method used

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Embodiment Construction

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] A DC-DC converter includes: a DC-DC converter main circuit and a control circuit based on a combination of dual-tube forward DC / DC converters.

[0017] The main circuit of the DC-DC converter is as follows figure 1 As shown, it consists of n series modules, including n high-frequency non-polar capacitors C with equal capacity 1 ~C n , n equalizing resistors R 1 ~R n , 1 high voltage DC input V in , 2n MOSFETs (metal oxide semiconductor field effect transistors) S 1a ~S na and S 1b ~S nb , 2n diodes D 1a ~D na and D r1 ~D rn , n high-frequency transformers T 1 ~T n , 1 filter inductor L, 1 output filter capacitor C, 1 load resistor R o ; where n is a positive integer; its connection relation is:

[0018] n high-frequency non-polar capacitors C with equal capacity 1 ~C n In series, each high-frequency non-polar capacitor is connecte...

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Abstract

The invention relates to a low and medium power high frequency DC-DC converter suitable for high-voltage input, which is based on the fundamental principle that: series capacitors are connected to a high-voltage direct current input, each capacitor serves as an input of the high-frequency forward DC-DC converter, and the outputs of the high-frequency forward DC-DC converter share a filter inductor, a freewheeling diode and an output filter capacitor; voltage feedback is acquired by sampling the output voltage of the high-frequency forward DC-DC converter, and a given reference voltage is compared with the voltage feedback so as to obtain a voltage loop output, namely a main output, by voltage regulation and calculation; and then, high-frequency forward DC-DC converter driving signals which are equational and alternate in phase are acquired to realized the control over a main circuit. The DC-DC converter has the advantages that: a low-voltage switching element is used under high voltage direct current input; the topology is simple; the cost is low; and the output has excellent dynamic and static performance.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a high-frequency DC-DC converter suitable for high-voltage input of medium and small power, belonging to the direction of high-frequency switching power supply in the field of power electronics. Background technique [0002] For high-frequency switching power supplies with high-voltage input, the main solutions are: ① switching devices in series; ② multi-level technology, using diode clamping, flying capacitors or H-bridge cascade technology; ③ primary topology in series. The disadvantage of method ① is that it cannot ensure that each switch is turned on or off at the same time. This is due to the difference of the driving signal or the switching characteristics of the switches, which will cause the switches to be out of synchronization, so that some switches are damaged due to excessive voltage stress. Method ② Using multi-level technology, if a diode clamp or flying capacitor is used, a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 沙德尚廖晓钟郭志强
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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