Intelligent driving control method and device for secondary synchronous rectifier
A technology of synchronous rectifier tube and driving device, which is applied in output power conversion devices, control/regulation systems, conversion equipment with intermediate conversion to AC, etc. Efficiency, eliminating the effect of false triggering
Active Publication Date: 2012-06-06
HANGZHOU MPS SEMICON TECH
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Problems solved by technology
This method requires a certain amount of time to achieve a reasonable shutdown, and the structure is complex, such as the drive module of STSR3 needs to consume more power
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[0042] The present invention will be described in detail through preferred embodiments with reference to the accompanying drawings. While the invention has been described in terms of several preferred embodiments, it is to be understood that the invention is not limited to the described embodiments. On the contrary, the present invention is to cover other changes, equivalents or alternatives within the spirit and scope of the present invention as defined by the claims. In the following detailed description, many specific details are provided for a better understanding of the present invention. It will, of course, be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In order to make the subject matter of the invention more prominent, some well-known methods, processes, components and circuits involved in the invention will not be described in detail.
[0043] image 3 It is a block diagram of an intellige...
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The invention discloses an intelligent driving control method and device for a secondary synchronous rectifier. The intelligent driving control device comprises a main circuit, a gate control filter circuit and an intelligent driving control circuit. The main circuit comprises a synchronous rectifier; the gate control filter circuit filters a drain-source voltage Vds of the secondary synchronous rectifier, is formed by connecting a capacitor and at least one resistor in series and outputs a filter voltage from any node between the capacitor and the resistor, and the absolute value of the filter voltage is calculated to obtain an absolute value Vf; the intelligent driving control circuit receives the filter voltage Vf and the drain-source voltage Vds of the secondary synchronous rectifier and outputs a gate driving signal. The control method comprises the essential as follows: when the drain-source voltage Vds is less than a second reference voltage Vthr2 and the filter voltage absolutevalue Vf is greater than a third reference voltage Vthr3, a Q1 is connected; and when the drain-source voltage Vds is greater than a first reference voltage Vthr1, the Q1 is disconnected. By increasing the simple gate control filter circuit, reliable driving can be realized. The invention realizes intelligent driving and eliminates false triggering by adopting the mode of increasing a simple analog circuit.
Description
technical field [0001] The invention relates to the drive of rectifier tubes, in particular to the intelligent gate drive control of secondary side synchronous rectifier tubes. Background technique [0002] There are currently two types of secondary side rectification schemes for flyback DC-DC converters. One is non-synchronous rectification, which uses diodes (such as Figure 1A shown), the other is synchronous rectification (such as Figure 1B shown). Synchronous rectification uses a gate drive signal to control the turn-on and turn-off of synchronous rectifiers to achieve rectification. Figure 1C The curves show the resistance characteristics of diodes and synchronous rectifiers. In practical applications, the working range of the low-power flyback DC-DC converter is in the shaded range. In this interval, the resistance characteristic curve 11 of the synchronous rectifier is located above the characteristic curve 12 of the diode resistance, that is, the on-resistance ...
Claims
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IPC IPC(8): H02M3/28H02M7/217H02M3/335
CPCY02B70/1475H02M3/33592Y02B70/10
Inventor 任远程张军明缪磊毛昭棋
Owner HANGZHOU MPS SEMICON TECH