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On-time generating circuit for switching power supply and switching power supply

A technology for generating circuits and on-time, which is applied in electronic switches, high-efficiency power electronic conversion, electrical components, etc., can solve the problem of unstable on and off frequency of switching power supplies, and achieve the effect of solving frequency instability

Active Publication Date: 2022-05-27
深圳市泰德半导体有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide an on-time generation circuit for switching power supply and a switching power supply circuit, so as to solve the problem in the prior art that a constant on-time generation circuit is used to control the switching power supply on and off at an unstable frequency

Method used

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  • On-time generating circuit for switching power supply and switching power supply
  • On-time generating circuit for switching power supply and switching power supply
  • On-time generating circuit for switching power supply and switching power supply

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Embodiment Construction

[0044] 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 only a part of the embodiments of the present invention, rather than all 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.

[0045] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features It is considered to be the range described in this specification.

[0046] see figure 1, is a schematic diagram of the str...

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Abstract

The invention discloses a turn-on time generating circuit and a switching power supply, the turn-on time generating circuit comprises a charging circuit, a current generating circuit and a comparator, input voltage is converted into current through the current generating circuit so as to control switching frequency in the switching power supply, and specifically, a current mirror circuit and a triode circuit are arranged on the current generating circuit so as to control the switching frequency in the switching power supply. An input voltage is collected by a triode circuit and converted into a circuit, a bias voltage is mirrored based on a current mirroring circuit, a charging voltage is provided for a charging circuit by using the bias voltage, and the charging circuit charges a switched capacitor on the charging circuit after receiving an internal upper tube signal of a switching power supply. The charging time is controlled by using the comparator, so that the conduction time of the switch of the switching power supply is controlled, and the problem that in the prior art, a constant conduction time generation circuit is adopted to control the on-off frequency of the switching power supply to be unstable is solved.

Description

technical field [0001] The present invention relates to the technical field of power management, and in particular, to an on-time generating circuit and a switching power supply circuit for a switching power supply. Background technique [0002] Constant On-Time control (COT), as a commonly used type of step-down switching power supply loop control technology, an important internal circuit module is called a constant on-time generation circuit, which is used for Generate a constant time to keep the upper channel power tube turned on. [0003] At present, the constant on-time generation circuit is mainly used to control the on and off in the switching power supply, and the constant on-time generation circuit has different design requirements based on the requirements of the switching power supply control technology. The traditional circuit uses current bias The circuit generates a fixed current to charge the capacitor to time the on-time. This circuit has a simple structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H03K17/687
CPCH02M1/08H03K17/6871Y02B70/10
Inventor 刘仕强贺策林熊进明鑫
Owner 深圳市泰德半导体有限公司
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