Full-bridge converter circuit and liquid crystal display equipment
A full-bridge converter and circuit technology, applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., can solve the problems of full-bridge converter noise and reducing output efficiency of full-bridge converters.
Active Publication Date: 2017-05-24
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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Problems solved by technology
This makes the primary winding input of the transformer in the full-bridge converter no longer a low-impedance loop, resulting in noise caused by the leakage inductance of the transformer and the excitation inductance of the full-bridge converter
Currently this noise can only be reduced by lossy absorption networks
But this will reduce the output efficiency of the full bridge converter
Method used
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[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0023] In addition, the following descriptions of the various embodiments refer to the attached drawings to illustrate specific embodiments in which the present invention can be implemented. The directional terms mentioned in the present invention, for example, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., only is to refer to the direction of the attached drawings. Therefore, the direction terms used are for ...
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The invention provides a full-bridge converter circuit comprising a full-bridge converter unit, first and second delay gating units and a controller. The full-bridge converter unit comprises first to fourth electric switches, a transformer and a rectifier. The first and fourth electric switches and the second and third electric switches are respectively diagonal switches. The first and second electric switches and the third and fourth electric switches are respectively connected in series between the voltage input end and the ground. The first and second ends of the primary coil of the transformer are connected with the node between the first and second electric switches and the node between the third and fourth electric switches. The first end and the fourth end of the controller are connected with the second and fourth electric switches. The second end and the third end of the controller are connected with the first and third electric switches through the first and second delay gating units. The controller controls the two diagonal switches to be conducted in turn. The first and third electric switches are conducted under the condition that the drain voltage is zero. The conversion efficiency of the full-bridge converter circuit can be enhanced.
Description
technical field [0001] The invention relates to the field of display technology, in particular to a full-bridge converter circuit and a liquid crystal display device. Background technique [0002] The full-bridge converter is the type with the highest power output, so the loss of the power switch of the full-bridge converter becomes a special concern. In a normal full-bridge converter, the diagonal power switches operate simultaneously. This makes the primary winding input of the transformer in the full-bridge converter no longer a low-impedance loop, resulting in noise caused by the leakage inductance of the transformer and the excitation inductance of the full-bridge converter. Currently this noise can only be reduced by lossy absorption networks. But this will reduce the output efficiency of the full bridge converter. Contents of the invention [0003] The purpose of the present invention is to provide a full-bridge converter circuit to improve the output efficiency ...
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IPC IPC(8): H02M3/335
CPCH02M3/33569H02M1/0058H02M1/0067Y02B70/10
Inventor 李文东
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD