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Constant-voltage loop control circuit and method, and switching power supply control circuit and chip

A technology for controlling circuits and switching power supplies, which is applied in the direction of control/regulation systems, electrical components, and adjustment of electrical variables, and can solve problems such as output voltage ripples and achieve the effect of avoiding ripples

Active Publication Date: 2020-04-10
SHENZHEN WINSEMI MICROELECTRONICS
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the control method in the existing technology, the change of the period T can be directly changed from the minimum (about 10us) to the maximum (8ms) between two adjacent periods. When the system is disturbed in a certain period during operation, the EA_SH voltage occurs Jumping, the T of this cycle can change drastically, resulting in a large output voltage ripple

Method used

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  • Constant-voltage loop control circuit and method, and switching power supply control circuit and chip
  • Constant-voltage loop control circuit and method, and switching power supply control circuit and chip
  • Constant-voltage loop control circuit and method, and switching power supply control circuit and chip

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Embodiment Construction

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0032] The inventor found through research that, in the control method in the prior art, the change of the cycle T can be directly changed from the minimum (about 10us) to the maximum (8ms) between two adjacent cycles. When the system is working in a certain cycle When disturbed, the EA_SH voltage jumps, and T of this cycle can change drastically, resulting in a la...

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Abstract

The invention relates to a constant-voltage loop control circuit and method, and a switching power supply control circuit and chip, and the constant-voltage loop control circuit comprises: an output voltage comparison module which is used for detecting whether an output voltage in a current period reaches a set value or not; an output voltage change trend detection module used for detecting whether the output voltage in the current period rises or falls compared with an output voltage in the previous period; and an PFM period control module connected with the output voltage comparison module and the output voltage change trend detection module, and used for determining to increase a specified value or reduce the turn-off time of the specified value in the period according to the detectionresult of the output voltage comparison module. By means of the constant-voltage loop control circuit, ripples introduced by a traditional constant-voltage loop control mode due to the fact that PFM period changes of two adjacent periods are too large are avoided.

Description

technical field [0001] The present application relates to the technical field of switching power supply, in particular to a constant voltage loop control circuit and method, a switching power supply control circuit and a chip. Background technique [0002] The primary-side feedback AC-DC control technology is a new type of AC-DC control technology developed in recent years. Compared with the traditional secondary-side feedback switching power supply structure, its biggest advantage is that it saves the isolation chip and cooperates with the isolation chip. A working set of components saves space on the board, reduces cost and increases system reliability. The primary-side feedback DC power supply has a large market share in applications with high cost pressure such as mobile phone chargers, and applications with high volume requirements such as LED drive power supplies. [0003] figure 1 A structural block diagram of a primary-side feedback AC-DC power supply control chip ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/08
CPCH02M1/08H02M3/33507
Inventor 许煌樟强永攀白文利贺玉婷
Owner SHENZHEN WINSEMI MICROELECTRONICS
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