Quick-opening and slow-closing circuit structure capable of realizing soft turn-off in switching power supply
A technology of switching power supply and circuit structure, applied in the direction of electrical components, output power conversion devices, etc., to achieve the effect of wide application and simple structure
Inactive Publication Date: 2018-06-01
JIANGSU ZHAONENG ELECTRONICS
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The invention aims at the shutdown stress problem of the secondary side synchronous rectifier tube and the freewheeling tube of the conventional switching power supply, and provides a fast-on-slow-off circuit structure for realizing soft shutdown in 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
[0014] A preferred embodiment of the present invention is given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.
[0015] The invention provides an easy-to-implement and low-cost fast-on-slow-off circuit structure for realizing soft turn-off in a switching power supply. Such as figure 1 The implementation circuit includes an input voltage source, a switching power supply power stage 10, a PWM control chip 20, an output load, and a fast-on and slow-off circuit 30.
[0016] The switching power supply power stage 10 can be any kind of switching power supply topology, such as figure 2 Among them, it is a flyback architecture, including input filter circuit, primary side switch tube, transformer, secondary side synchronous rectifier tube, and output filter circuit. The first port OUT of the PWM control chip 20 is directly or indirectly connected to the control terminal of the primary switching tube in the ...
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 provides a quick-opening and slow-closing circuit structure capable of realizing soft turn-off in a switching power supply. The circuit structure comprises an input voltage source, a switching power supply power grade, a PWM (Pulse-Width Modulation) control chip and a quick-opening and slow-closing circuit, and is characterized in that the circuit structure is used for adjusting voltage signal rising and falling time of a third port SS of the PWM control chip by utilizing a voltage signal rising and falling speed of the quick-opening and slow-closing circuit; controllable switching-on time is realized when the switching power supply is switched on and shutdown time when the switching power supply is shut down through controlling the voltage signal rising and falling time of the port, so that quick opening and slow closing of the switching power supply are realized and soft turn-off is realized. The circuit structure is simple in structure, low in cost and easy to realizeand a novel scheme is provided for solving shutdown stress of a secondary side synchronous rectification tube in the switching power supply.
Description
technical field [0001] The invention relates to the application field of switching power supplies, in particular to a fast-on-slow-off circuit structure for realizing soft turn-off in a switching power supply. Background technique [0002] Switching power supplies are essential and critical components in modern electronic systems. With the continuous advancement of science and technology, people have higher and higher requirements for switching power supplies, high density, low cost, high power, low voltage and high current input, low power consumption, and high efficiency, making synchronous rectification technology widely used in modern switches In the power supply, at the same time, the switching power supply also has to withstand long-term work, long-term high and low temperature tests, and frequent power-on and off shock tests. New requirements have been imposed, so that the synchronous rectifier and freewheeling tube must have sufficient derating to ensure that they a...
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 Applications(China)
IPC IPC(8): H02M1/36H02M1/32
CPCH02M1/36H02M1/32
Inventor 杨光刘年凤杨梅英
Owner JIANGSU ZHAONENG ELECTRONICS