Control method for reducing conduction time of ACF power tube body diode
A body diode, on-time technology, applied in output power conversion devices, control/regulation systems, and DC power input into DC power output, etc. pass effect
Active Publication Date: 2020-11-27
SOUTHEAST UNIV
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Problems solved by technology
[0008] The purpose of the present invention is to address the shortcomings of the above-mentioned background technology and provide a control method for reducing the conduction time of the body diode of the ACF power transistor. Pulse signals are generated according to the forward zero-crossing signal and reverse zero-crossing signal of the auxiliary winding voltage. The clamp switch and the main switch are turned on separately, which effectively avoids the conduction of the body diode, and solves the technical problem that the working efficiency of the active clamp flyback converter is reduced due to the conduction loss of the switch body diode
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[0022] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.
[0023] In view of the problem of parasitic body diode conduction loss in the dead time of switching between the main switch tube and the clamp switch tube of the active clamp flyback converter, this application uses the forward zero-crossing signal and reverse zero-crossing signal of the auxiliary winding voltage The clamp switch tube and the main switch tube are respectively turned on to avoid body diode conduction, thereby improving the working efficiency of the active clamp flyback converter. The body diode conduction time control method disclosed in this application is suitable for active clamp flyback converter topology, as follows figure 2 The active clamp flyback converter shown is taken as an example to illustrate the specific implementation of the control method.
[0024] Such as figure 2 As shown, the active clamp flyback converter used ...
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The invention discloses a control method for reducing the conduction time of an ACF power tube diode, and belongs to the technical field of power generation, power transformation or power distribution. The method comprises the following steps: detecting a zero crossing point of auxiliary winding voltage in the ACF; when the voltage of the auxiliary winding is reversely zero-crossing, conducting amain switch driving circuit; when the voltage of the auxiliary winding crosses zero in the forward direction, conducting a clamping switch tube; through a control circuit comprising a voltage zero-crossing comparator, an edge detection module, a main switch tube driving circuit and a clamping switch tube driving circuit, respectively obtaining a clamping switch tube conduction signal and a main switch tube conduction signal through a forward zero-crossing signal and a reverse zero-crossing signal of the voltage of the auxiliary winding of the active clamping flyback converter to effectively avoid conduction of a body diode and improve the working efficiency of the active clamping flyback converter. The method is simple and feasible, the cost is low, the conduction loss of the body diode can be reduced, and the circuit working efficiency is improved.
Description
technical field [0001] The invention relates to an optimized switching power supply design technology, in particular to a control method for reducing the conduction time of a body diode of an ACF power transistor, and belongs to the technical field of power generation, power transformation or power distribution. Background technique [0002] In recent years, with the widespread popularization of electronic mobile devices, they play an important role in people's work and life. As the core component of each mobile device, the power supply directly affects the performance parameters of electronic equipment and the reliability of its work. The current mainstream application is Switch Mode Power Supply. A switching power supply, also known as a switching converter, is a power supply that uses modern power electronics technology to control the time ratio of the switch tube being turned on and off to maintain a stable output voltage. [0003] With the rapid development of consumer...
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IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/0058Y02B70/10
Inventor 孙伟锋曹宇邹昊宸于沐鑫陈明刚徐申时龙兴
Owner SOUTHEAST UNIV