Power supply circuit of switching power supply and power supply method thereof
A switching power supply, power supply circuit technology, applied in the direction of high-efficiency power electronic conversion, electrical components, adjusting electrical variables, etc., can solve problems such as exceeding pin withstand voltage requirements, chip pin overvoltage, and increasing voltage, reducing design Cost, loss reduction, current reduction effect
Active Publication Date: 2022-05-27
SHENZHEN INJOINIC TECH
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Problems solved by technology
[0003] The power supply of the existing switching power supply is generally based on the power supply of the auxiliary winding. The power supply form based on the auxiliary winding is accompanied by the overvoltage risk of the chip pin caused by the increase of the output voltage, that is, the voltage on the auxiliary winding will also increase with the increase of the output voltage. become larger, and then exceed the withstand voltage requirements of the pins, thereby causing safety hazards
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[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0027] The terms "first", "second", "third" and "fourth" in the description and claims of the present invention and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. . Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or un...
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The invention provides a power supply circuit of a switching power supply and a power supply method thereof, the power supply circuit of the switching power supply comprises a main power tube and an auxiliary power tube which are integrated in a chip, the drain electrode of the former is connected to a pin DN, the grid electrode is connected to a starting resistor, and the source electrode is connected to the drain electrode of the latter; the rear HV is externally connected to a starting circuit composed of a starting resistor Rstart1 and a second switch tube D2, the starting circuit is connected with AC input, the connection point of the two power tubes is connected with a diode D3 and then connected to a pin VDD to form a one-way charging circuit, the module Delay 4 and the module Select 5 are connected with the grid electrodes of the main power tube 1 and the auxiliary power tube 2 respectively, the other ends of the main power tube 1 and the auxiliary power tube 2 are jointly connected to a control module PWM controller 3, and the other ends of the main power tube 1 and the auxiliary power tube 2 are connected to a control module. A PWM control signal is generated, and the PWM control module can be a general PWM control module. The technical scheme provided by the invention has the advantage of high safety.
Description
technical field [0001] The invention relates to the field of electronic equipment, in particular to a power supply circuit of a switching power supply and a power supply method thereof. Background technique [0002] Based on its advantages of high efficiency and small size, switching power supplies are widely used in power supply systems for loads such as computers, electrical appliances, and portable electronic equipment. It is capable of converting general electrical power into a power source more suitable for the load application. In common applications, the power input is mainly from the mains (50Hz, 220V AC), and the switching power supply can convert this power into the low-voltage DC power required by the load. As the key to the normal operation of the switching power supply, the controller itself also needs a certain working voltage to maintain its basic functions. [0003] The power supply of the existing switching power supply is generally based on the auxiliary ...
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IPC IPC(8): H02M1/088H02M1/36H02M1/32H02M3/335H02M7/06
CPCH02M7/068G05F3/262Y02B70/10
Inventor 杨晨涛陈伟
Owner SHENZHEN INJOINIC TECH