Drive circuit of two-transistor forward synchronous rectification circuit
A driving circuit and synchronous rectification technology, applied in electrical components, output power conversion devices, etc., can solve the problem of inability to adjust the dead zone of the rectifier tube and the freewheeling tube, uncontrollable time of the rectifier tube and the freewheeling tube, and damage to the main switch tube and other issues, to achieve the effect of improving efficiency, wide application range, and reducing switching loss
Active Publication Date: 2014-05-14
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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Problems solved by technology
[0012] 1. It is impossible to adjust the dead zone of the drive of the rectifier tube and the freewheeling tube. In the case of output load start-up or dynamic load, output short circuit, etc., the common phenomenon of uncontrollable rectifier tube and freewheeling tube will randomly appear, resulting in efficiency In serious cases, the winding on the secondary side will be short-circuited and damage the main switching tube or output synchronous rectifier tube
[0013] 2. Use the load generated in the reverse direction of the secondary winding to shut off the freewheeling tube. The shutdown speed is slow and there are serious safety hazards
Method used
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[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0040] The drive circuit of the present invention is suitable for a dual-transistor forward synchronous rectification circuit, and the dual-transistor forward synchronous rectification circuit includes a dual-transistor forward conversion network on the primary side of the transformer and a synchronous rectification conversion network on the secondary side of the transformer. The drive circuit of the dual-transistor forward synchronous rectification circuit of the present invention includes a dual-transistor drive circuit for driving the dual-transistor forward conversion network and a freewheel drive circuit for driving the freewheel tube in the synchronous rectification conversion network.
[0041] Figure 4 It is a schematic diagram of the dual-tube driving cir...
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An embodiment of the invention discloses a drive circuit of a two-transistor forward synchronous rectification circuit. The two-transistor forward synchronous rectification circuit comprises a two-transistor forward transforming network and a synchronous rectification transforming network, wherein the two-transistor forward transforming network is located on the primary side of a transformer, and the synchronous rectification transforming network is located on the secondary side of the transformer. The drive circuit of the two-transistor forward synchronous rectification circuit comprises a two-transistor drive circuit and a follow current transistor drive circuit, wherein the two-transistor drive circuit is used for driving the two-transistor forward transforming network, the follow current transistor drive circuit is used for driving the synchronous rectification transforming network, the two-transistor drive circuit comprises a regulating circuit used for regulating input signal switching-on time of the two-transistor drive circuit, and / or the follow current transistor drive circuit comprises a self-locking discharging circuit used for rapidly releasing current in a follow current transistor in the synchronous rectification transforming network. By the adoption of the drive circuit, dead zone regulation of driving of a rectification transistor and the follow current transistor can be achieved, and meanwhile rapid switching-off of the synchronous follow current transistor is achieved.
Description
technical field [0001] The invention relates to a driving circuit, in particular to a driving circuit of a double-tube forward synchronous rectification circuit. Background technique [0002] At present, professional LED display screens and LED lighting have become the mainstream, especially in recent years, the products have become internationalized, and the requirements for product quality, power density, power supply efficiency and operating environment have become more stringent. With the implementation of the new national standard, well-known domestic LED display manufacturers will also pay special attention to power efficiency, ultra-thin, environment and other aspects. [0003] For this reason, high-efficiency, ultra-thin, small-volume, low-to-medium power products are currently the mainstream products of LED power supplies. In order to improve efficiency, the topology of soft switching (LLC half-bridge resonant, asymmetrical half-bridge, dual-transistor forward) plu...
Claims
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Inventor 徐跃华
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD