Synchronous rectification control circuit of switch power supply secondary and flyback switch power supply

A switching power supply and control circuit technology, which is applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve problems such as difficult to avoid parasitic attenuation and oscillation misoperations, so as to avoid false conduction actions, correct detection status, The effect of improving efficiency

Active Publication Date: 2011-11-02
BCD (SHANGHAI) MICRO ELECTRONICS LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, according to the magnitude of the voltage across the secondary winding 103,

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  • Synchronous rectification control circuit of switch power supply secondary and flyback switch power supply
  • Synchronous rectification control circuit of switch power supply secondary and flyback switch power supply
  • Synchronous rectification control circuit of switch power supply secondary and flyback switch power supply

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Embodiment Construction

[0067] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0068] In view of this, the purpose of the present invention is to provide a synchronous rectification control circuit and a switching power supply on the secondary side of a switching power supply, which can use the volt-second product of the voltage at both ends of the secondary winding as a judgment standard to distinguish the normal primary switching action The voltage at both ends of the secondary winding and the parasitic attenuation oscillation, so as to realize the adaptively adjustable secondary rectification control and ensure the correct detection state.

[0069] refer to image 3 , is a circuit structure diagram of a primary-side controlled flyback switching power supply provided by an embodiment of the present inventi...

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Abstract

The invention discloses a synchronous rectification control circuit of a switch power supply, which is used for the the secondary rectification control of the switch power supply. The circuit comprises a primary state detection unit and a rectifier tube control circuit, wherein the primary state detection unit is used for receiving the voltages of the two ends of the secondary winding of the switch power supply and outputting a state signal to the rectifier tube control circuit; and the rectifier tube control circuit is used for outputting a synchronous control signal according to the state signal and the drain-source voltage of a secondary rectifier tube of the switch power supply so as to control the on and off of the rectifier tube. By adopting the embodiment of the invention, the voltages and parasitic damped oscillation at two ends of the secondary winding, which are excited by normal primary switch actions, can be distinguished based on the voltage second procuct of the voltages of the two ends of the secondary winding, thereby achieving the secondary rectification control which can be adaptively regulated and ensuring a correct detection state.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a synchronous rectification control circuit for a secondary side of a switching power supply and a flyback switching power supply. Background technique [0002] The flyback switching power supply controlled by the primary side has gradually become an important electronic component power supply device due to its small size and high efficiency. Generally, a rectifier diode is connected in series at the output end to provide a DC output voltage. With the development of electronic technology, the output voltage required by the load electronic components is getting lower and higher, and the output power is getting higher and higher. Therefore, the forward conduction voltage drop of the rectifier diode has become the main factor limiting the efficiency of the switching power supply. [0003] The commonly used solution at present is to use a rectifier tube to simulate a...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M3/335
CPCY02B70/1475Y02B70/10
Inventor 赵平安陈超
Owner BCD (SHANGHAI) MICRO ELECTRONICS LTD
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