Switch control circuit, switch control method thereof and switch power supply

A technology of switch control circuit and switching power supply, which is applied in the direction of control/regulation system, high-efficiency power electronic conversion, electrical components, etc., and can solve the problem of low precision of constant current control

Pending Publication Date: 2022-05-31
SHENZHEN KIWI MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the constant current control accuracy of the existing technical solutions is not high, and in some application sc

Method used

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  • Switch control circuit, switch control method thereof and switch power supply
  • Switch control circuit, switch control method thereof and switch power supply
  • Switch control circuit, switch control method thereof and switch power supply

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Embodiment Construction

[0049] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0050] The description in this part is only for several typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. Combinations of different embodiments, mutual replacement of some technical features in different embodiments, mutual replacement of the same or similar prior art means and some technical features in the embodiments are also within the scope of description and protection of the present invention.

[0051]"Coupling" or "connection" in the specification includes both direct connection and indirect connection. An indirect connection is a connection through an i...

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Abstract

The invention provides a switching control circuit, a switching control method thereof and a switching power supply. The switch control circuit is used for controlling a main switch tube in the switch power supply and comprises a feedback signal processing circuit, a signal conversion circuit and a driving signal generation circuit. The feedback signal processing circuit receives a feedback signal representing an output signal of the switching power supply, and the feedback signal processing circuit is used for generating a low-voltage side signal according to the feedback signal. The signal conversion circuit is coupled with the feedback signal processing circuit and is used for generating a high-voltage side signal according to the low-voltage side signal; and the high-voltage side signal is an analog signal. The input end of the driving signal generation circuit is coupled with the second end of the signal conversion circuit, and the driving signal generation circuit is used for generating a switch control signal according to the high-voltage side signal. According to the switch control circuit, the switch control method thereof and the switch power supply provided by the invention, high-precision constant voltage control and/or constant current control can be realized through output direct sampling.

Description

technical field [0001] The invention belongs to the field of power electronics and relates to a switch control technology, in particular to a switch control circuit, a switch control method and a switch power supply. Background technique [0002] Switching power supply is the main category of electronic power supply. Due to its light weight, miniaturization, wide input voltage range, high power density / conversion efficiency, and low standby power consumption, it is widely used in consumer electronics, communication equipment, etc. most electronic devices. [0003] Step-down switching power supply is a commonly used topological circuit in switching power supply. According to the setting position of the main switch tube in switching power supply, it can be divided into high-voltage side step-down switching power supply and low-voltage side step-down switching power supply. Among them, the step-down switching power supply on the high voltage side includes a main switching tube...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M1/088H02M1/00
CPCH02M3/156H02M1/088H02M1/00Y02B70/10
Inventor 曾强
Owner SHENZHEN KIWI MICROELECTRONICS CO LTD
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