A High Efficiency and Low Cost Forward and Flyback DC-DC Converter Topology

A technology of DC-DC and converter, applied in the field of switching power supply

Inactive Publication Date: 2016-03-30
SANTAK ELECTRONICS SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention was developed to solve the above mentioned problems

Method used

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  • A High Efficiency and Low Cost Forward and Flyback DC-DC Converter Topology
  • A High Efficiency and Low Cost Forward and Flyback DC-DC Converter Topology
  • A High Efficiency and Low Cost Forward and Flyback DC-DC Converter Topology

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Embodiment Construction

[0027] The following describes preferred embodiments according to the present invention with reference to the accompanying drawings. In the accompanying drawings, similar reference numerals represent similar elements, so they will not be described in detail again. "U" and "V" are symbols representing voltage , are used indiscriminately below.

[0028] image 3 shows an equivalent circuit diagram of an active-clamp forward-flyback DC-DC converter topology according to an embodiment of the present invention, in image 3 Among them, Lr and Lm represent the leakage inductance and excitation inductance separated from the actual transformer equivalent model, respectively, and the transformer is an ideal transformer. Depend on image 3 It can be seen that the topology of the DC-DC converter according to this embodiment includes a high frequency transformer, a main switch T1, an active clamp circuit, rectifier diodes D1 and D2, a resonant circuit and an output capacitor C0.

[0029...

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PUM

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Abstract

A high-efficiency and low-cost forward and flyback DC-DC converter topology. The topology of the forward and flyback DC-DC converter includes a transformer, a main switch tube, a clamping circuit, a first and a second rectifier switch tube, an LC resonance circuit and an output capacitor. The primary winding of the transformer is connected in series with the main switch tube in the first and second rectifier switches. Between the second input terminal and the second input terminal, a clamping circuit composed of a clamping capacitor and a clamping switch tube connected in series is connected in parallel with the primary winding or the main switching tube, and the secondary winding of the transformer includes a forward winding and a flyback winding, so that The end of the current flowing into the primary winding is the same-named end of the primary winding. The connection of the secondary side of the transformer is as follows: the same-named end of the forward winding is connected to the first output terminal through the first rectifier switch tube, and the same-named end of the flyback winding is connected to the first output terminal through the first rectifier switch. The two rectifier switches are connected to the second output terminal, and the LC resonant circuit is connected to the first and second output terminals and the opposite ends of the forward and flyback windings so that the first and second rectifier switches can realize zero-current switching, and the output A capacitor is connected between the first and second output terminals.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a direct current-direct current (DC-DC) converter. Background technique [0002] DC-DC converters have been commercialized and widely used in UPS systems, battery charging and discharging devices, electric vehicles, starting / generating systems, aerospace power systems, remote and data communication systems, computer equipment, office automation equipment, industrial instruments instruments etc. According to different working modes, DC-DC converters can be divided into buck, boost, buck / boost, flyback, forward, half-bridge, full-bridge, push-pull and other topologies structure. With the improvement of performance requirements for switching power supplies, new circuit topologies need to be developed to realize high-efficiency DC-DC converters. [0003] Due to the advantages of low cost and wide input voltage range, the active clamp flyback DC-DC is often used in the "Supe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/337H02M1/00
CPCH02M3/33569Y02B70/10H02M1/0058H02M3/01H02M3/33507H02M3/33523H02M3/33538H02M3/33553H02M3/3353
Inventor 胡智伦顾亦磊温志伟张昌丹
Owner SANTAK ELECTRONICS SHENZHEN
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