MOS-tube-based self-driven synchronous rectification drive circuit
A synchronous rectification, MOS tube technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output and other directions, can solve problems such as low gate breakdown voltage, achieve good certainty and high efficiency , the effect of small driving loss
Inactive Publication Date: 2016-05-11
张从辉
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Problems solved by technology
However, since the gate drive voltage of the Mos tube is clamped at the output voltage, and the gate breakdown voltage is low, it is only suitable for lower output voltages.
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[0013] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0014] The self-driven synchronous rectification drive circuit based on MOS transistors in the present invention is composed of a transformer, a current transformer, a synchronous rectifier tube M1 and a synchronous rectifier tube control circuit. The transformer is composed of a secondary side winding and an auxiliary winding. The starting point and the ending point of the secondary side winding are respectively connected to the starting point of the primary winding of the current transformer and the ending point of the secondary winding, the endpoint of the primary winding of the current transformer is connected to the drain of the synchronous rectifier, and the source and the substrate of the synchronous rectifier are grounded; A filter capacitor C3 is also connected between...
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The invention relates to an MOS-tube-based self-driven synchronous rectification drive circuit comprising a transformer, a current transformer, a synchronous rectifier tube and a synchronous rectifier tube control circuit. The transformer is formed by a secondary side winding and an auxiliary winding; the starting point and the end point of the secondary side winding are connected with a primary winding starting point and a secondary winding end point of the current transformer respectively; the end point of the primary winding of the current transformer is connected with a drain electrode of the synchronous rectifier tube; and a source electrode of the synchronous rectifier tube and a substrate are grounded. The synchronous rectifier tube control circuit consists of a first driving triode and a second driving triode; a first capacitor is connected in parallel between an emitter and a collector of the second driving triode. According to the invention, the MOS-tube-based self-driven synchronous rectification drive circuit has the following characteristics: (1), the circuit can be widely applied to various output voltages; (2), the circuit structure and principle are simple; (2), the driving loss is low and the efficiency is high; and (4), the circuit certainty is good and no misoperation is caused.
Description
technical field [0001] The invention relates to the field of electronic circuits, in particular to a self-driven synchronous rectification drive circuit based on a MOS transistor. Background technique [0002] With the development of high-power white LED technology, the lighting industry begins to face new opportunities and challenges. LEDs are increasingly being used in the field of general lighting, and road lighting is one of the important application areas with great potential. Due to the unique characteristics of long life and potentially high luminous efficiency of LED itself, it is particularly important to design a high-efficiency constant-current drive power supply that can give full play to these characteristics. [0003] In a general flyback switching power supply, the loss of the rectifier diode on the secondary side is also one of the important factors affecting the efficiency of the power supply. This problem can be alleviated by selecting a Schottky diode wit...
Claims
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IPC IPC(8): H02M7/217
Inventor 张从辉
Owner 张从辉