Driving device and method

Abstract

The invention discloses a driving device. The driving device comprises a first driving end, a second driving end, a driving circuit, a first output end, a second output end, a third output end and a fourth output end; after complementary PWM input signals which are input by the first driving end and the second driving end and contain dead time are processed through the driving circuit, a first driving signal, a second driving signal, a third driving signal and a fourth driving signal are obtained, wherein the first driving signal and the second driving signal are used for driving a dual-transistor forward conversion network, and the third driving signal and the fourth driving signal are used for driving a synchronous rectification conversion network; the first driving signal, the second first driving signal, the third first driving signal and the fourth first driving signal are simultaneously output through the first output end, the second output end, the third output end and the fourth output end. The invention further discloses a driving method. By the adoption of the driving device and method, a driving mode can be simple, cost is lowered, and the compatibility, efficiency and stability of a product are improved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a driving device and a method. Background technique [0002] Compared with the traditional linear power supply, the switching power supply has the characteristics of small size and high conversion efficiency, and is widely used in various electronic equipment such as industrial control, communication office, and home consumption. [0003] High-efficiency, ultra-thin, small-volume, low-to-medium power products are currently the mainstream products used in power supplies for electronic equipment. In order to improve efficiency, the topology of soft switching (LLC half-bridge resonant, asymmetrical half-bridge, dual-tube forward) plus output synchronous rectification (self-driven synchronous rectification, IC control chip synchronous rectification, other-driven synchronous rectification) is usually selected. [0004] No matter which method is used to use output synchronous rect...

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Problems solved by technology

[0012] 1. In the prior art, two drive circuits are required to drive the dual tubes in the dual-tube forward conversion network and the freewheeling tube in the synchronous rectification conversion network respectively. The circuit is complex and the cost is relatively high.

[0013] 2. In the prior art, the driving voltage of the secondary rectifier tube is taken from the secondary winding of the main transformer. When the output voltage of the power supply is high and the input voltage range is very wide, the loss of the driving circuit will be large, so that high output voltage equipment cannot be realized. synchronous rectification, which seriously affects the compatibility and efficiency of the product

[0014] 3. The drive circuit in the prior art can only realize the turn-on delay between the secondary synchronous rectifier and the freewheeling tube, but cannot realize the turn-off delay, and the product stability is poor

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