Power supply method and control chip for control chip in flyback switching power supply
A technology for controlling chips and switching power supplies, which is applied in emergency power supply arrangements, electrical components, circuit devices, etc., and can solve the problems of inability to supply power to the internal function modules of the chip 168, and special function modules unable to work normally.
Active Publication Date: 2020-07-10
BCD (SHANGHAI) MICRO ELECTRONICS LTD
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Problems solved by technology
Obviously, in the prior art, if the voltage of the power supply pin is lower than the cut-off voltage of the power supply module, the power supply module cannot be started, so the internal function modules of the control chip 168 cannot be powered, resulting in the failure of special function modules. normal work
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[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0033] The core of the invention is to provide a power supply method for a control chip in a flyback switching power supply and the control chip. It is used to supply power to the control chip. When the main power supply module cannot supply power to the special function module, the auxiliary power supply module can immediately supply power to the special function module.
[0034] In order to enable those skilled in the art to better understand...
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The invention discloses a power supply method for a control chip in a flyback switching power supply and the control chip. In this method, after the control chip receives the power-on signal, the auxiliary power supply module can quickly supply power to the predetermined function module to make the predetermined function module work normally. When the charging voltage reaches the starting voltage of the main power supply module, the main power supply module Supply power to the predetermined function modules, and at the same time, the auxiliary power supply module stops supplying power to the predetermined function modules. The supply module can immediately continue to supply power to the predetermined function module, so as to ensure that the predetermined function module still works normally and improve the anti-interference performance of the control chip.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a power supply method for a control chip in a flyback switching power supply and the control chip. Background technique [0002] In recent years, with the increasing development of power electronics technology, power converters play an important role in people's lives. People are also increasingly relying on the convenience benefits of power converters. For example: household appliances, USB chargers, power adapters and other applications. [0003] Power converters are divided into linear and switching converters. Among them, the flyback converter is particularly popular among switching power converters, and the flyback converter is the best choice for cost and benefit in low-power and medium-power applications. [0004] At present, the flyback circuit system architecture is widely used in AC to DC conversion in the flyback converter. Please refer to figure 1 , fi...
Claims
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IPC IPC(8): H02M7/217H02J9/06
CPCH02J9/06H02M7/217H02M1/0003
Inventor 赵安东应征王为
Owner BCD (SHANGHAI) MICRO ELECTRONICS LTD