Automatic dead time optimization system in CCM of primary side feedback type flyback power supply

A technology of dead time and primary side feedback, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., can solve the problems of parasitic diode conduction loss, diode reverse recovery loss, etc., and achieve the reduction of forward conduction Loss and Reverse Recovery Loss, Optimized Dead Time, Effect of Dead Time Optimization

Active Publication Date: 2019-07-09
SOUTHEAST UNIV +1
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Problems solved by technology

[0017] From the above analysis, it can be seen that the main problem of the current synchronous rectification flyback switching power supply working in CCM mode is that there are serious parasitic diode conduction losses and diode reverse recovery loss

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  • Automatic dead time optimization system in CCM of primary side feedback type flyback power supply
  • Automatic dead time optimization system in CCM of primary side feedback type flyback power supply
  • Automatic dead time optimization system in CCM of primary side feedback type flyback power supply

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Embodiment Construction

[0048] In order to illustrate the present invention more clearly, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments.

[0049] figure 1 It is a circuit diagram of a traditional primary-side feedback flyback switching converter using diode rectification. In the traditional flyback switching converter, the diode rectification method is used, such as figure 1 shown. For the application of high-power power supply system, the loss of the rectifier diode has become the bottleneck to improve the system efficiency, so a synchronous rectification structure with higher efficiency is proposed.

[0050] Synchronous rectification is a new technology that replaces rectifier diodes with MOSFETs with extremely low on-state resistance, and is mainly used in low-voltage and high-current applications. In order to improve efficiency and reduce losses, the use of synchronous rectification ...

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Abstract

The invention discloses an automatic dead time optimization system in a CCM of a primary side feedback type flyback power supply. According to the system, a control system composed of a single-outputDAC midpoint sampling module, a digital control module, a current detection module, a dead time calculation module and a PWM driving module, and a controlled synchronous rectification primary side feedback type flyback converter forms a closed loop; through a DAC sampling mechanism, a primary side current is sampled to calculate a secondary side average current; a primary side average current Imid_p and the secondary side average current Is(tmid) in the CMM are obtained; the secondary side current is input to the dead time calculation module to obtain a reasonable dead time td; finally the PWMdriving module is jointly controlled through a primary side feedback loop and the obtained dead time td; and a primary side switch tube driving signal duty and a secondary side rectifier tube drivingsignal duty_SR are generated, so that the dead time between the closing of a secondary side rectifier tube and the opening of a primary side switch tube in the CCM can be reasonably optimized.

Description

technical field [0001] The invention relates to a flyback switching power supply using synchronous rectification primary side feedback, in particular to an automatic dead-time optimization system in CCM mode of a synchronous rectification primary side feedback flyback power supply, belonging to the technical field of isolated switching power supply converters. Background technique [0002] The power supply is an indispensable part of every electronic device, and its performance is directly related to the technical indicators of the electronic device and whether it can work safely and reliably. At present, the mainstream application is the switching power supply (Switch Mode Power Supply). Switching power supply, also known as switching converter, is a power supply that uses modern power electronics technology to make the output voltage constant by adjusting the conduction ratio of switching devices. [0003] Since the flyback transformer has the dual functions of a transform...

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Application Information

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IPC IPC(8): H02M1/38H02M3/335
CPCH02M1/38H02M3/33592H02M1/0048H02M3/33515Y02B70/10H02M1/0051H02M1/385H02M1/083H02M1/0009
Inventor 徐申陈明刚王浩肖金玉苏巍孙伟锋时龙兴
Owner SOUTHEAST UNIV
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