Control method and controller for slow turn-on and slow turn-off of synchronous rectification switching tube
A technology of synchronous rectification switch and control method, applied in the direction of output power conversion device, electrical components, etc., can solve the problem of increased voltage stress of synchronous rectification switching tube, damage of synchronous rectification switching tube, and reducing the safety and reliability of switching power supply, etc. problems, to achieve the effect of improving safety and reliability, and avoiding the increase of voltage stress
Active Publication Date: 2021-02-23
KOSTAL SHANGHAI MANAGEMENT +1
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] However, when the switching power supply is under no-load (or light-load) conditions, for the output inductor of the switching power supply, the existing slow turn-on and slow turn-off methods will cause the negative inductor current to fail to continue through the synchronous rectification switch tube. flow, which leads to an increase in the voltage stress between the drain and source of the synchronous rectification switch tube, and even exceeds its allowable maximum voltage limit, causing damage to the synchronous rectification switch tube, thereby reducing the safety and reliability of the switching power supply
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0051]The core of the present invention is to provide a control method and controller for the slow turn-on and slow turn-off of the synchronous rectifier switch tube. Even under no-load conditions, the output inductance of the switching power supply can always pass the synchronous current in the freewheeling phase of each switching cycle. The rectifier switch tube performs freewheeling, so as to avoid the increase of voltage stress between the drain and source of the synchronous rectifier switch tube, thereby improving the safety and reliability of the switching power supply.
[0052]In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present inv...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a control method and a controller for slow turn-on and slow turn-off of a synchronous rectification switch tube. The initial edge positions move toward each other until the pulse width of the drive signal reaches the preset turn-off drive pulse width; when controlling the slow turn-on of the synchronous rectification switch tube, the two edges of the drive signal of the synchronous rectification switch tube are moved back from their respective initial positions , until the pulse width of the drive signal reaches the preset turn-on drive pulse width; wherein, in any switching period, the time of the falling edge of the drive signal of the synchronous rectification switch tube is not earlier than the inductor current of the output inductor in the switching power supply from negative to negative increase until it reaches 0. It can be seen that the present application avoids the situation that the voltage stress between the drain and the source of the synchronous rectification switching tube increases, thereby improving the safety and reliability of the switching power supply.
Description
Technical field[0001]The invention relates to the technical field of power electronics, and in particular to a control method and a controller for slow turn-on and slow turn-off of a synchronous rectifier switch tube.Background technique[0002]In the actual application of the switching power supply, in order to improve the performance of the switching power supply, in some applications, the synchronous rectification switch tube in the switching power supply is usually in the diode mode (the field effect tube is turned off, only the body diode is turned on) and the synchronous rectification mode ( Switch between FET on). In the prior art, in order to avoid large jitters in the output voltage during the switching of the two modes, when the synchronous rectification switch is switched from the diode mode to the synchronous rectification mode, it is generally necessary to gradually increase the drive of the synchronous rectification switch through a slow turn-on method. The pulse width o...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/088
CPCH02M1/088
Inventor 王小磊王峰廖政伟
Owner KOSTAL SHANGHAI MANAGEMENT