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Switching Mode Power Supplies with Fast Load Transient Response

A power supply, switching cycle technology, applied to electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve problems such as output voltage drop

Active Publication Date: 2019-05-10
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the load transient response is not fast enough, the output voltage may drop outside the acceptable range

Method used

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  • Switching Mode Power Supplies with Fast Load Transient Response
  • Switching Mode Power Supplies with Fast Load Transient Response
  • Switching Mode Power Supplies with Fast Load Transient Response

Examples

Experimental program
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Effect test

Embodiment Construction

[0099] In this specification, there are some same symbols, which represent elements with the same or similar structure, function, and principle, and can be deduced by those skilled in the art based on the teaching of this specification. For the sake of brevity in the description, elements with the same symbols will not be repeated.

[0100] figure 1 A charger 60 produced according to an embodiment of the present invention is a switching power supply capable of charging an electronic device (not shown) connected to the USB connector 12 . For safety considerations, the charger 60 has a galvanic isolated primary side 14P and a secondary side 14S. There is no DC connection between primary side 14P and secondary side 14S. The circuit on the primary side 14P (including the primary side controller 64 ) is mainly powered by the input power VIN and the input ground GNDI, and the input power VIN and the input ground GNDI are powered by the AC mains V AC-IN It is produced by full-wave...

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PUM

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Abstract

Embodiments provide a fast load transient response switching power supply having an isolated primary side and secondary side. The power supply includes a primary side control circuit and a secondary side control circuit. The primary side control circuit is disposed on the primary side and controls a power switch to convert an input power supply on the primary side into an output power supply on the secondary side. The output power supply has an output voltage. The secondary side control circuit is provided on the secondary side and is used to detect the output voltage and can detect a decreasing rate of the output voltage. When the decreasing rate is greater than a predetermined value, the secondary side control circuit may provide information to the primary side control circuit. When the primary side control circuit receives the information, the primary side control circuit starts a switching cycle to detect and calibrate the output voltage through an inductive element.

Description

technical field [0001] The invention relates to a switching power supply, especially a switching power supply adopting primary side control. Background technique [0002] A power supply is an essential device for almost all electronic products. For example, the power supply can convert the AC mains power into the power specification required by the main circuit (core circuit) of the electronic product. Among all the power supplies, the switch mode power supply has the advantages of good conversion efficiency and small product size, so it is widely used in the industry. [0003] In order to prevent users from being damaged by unnecessary lightning strikes or high voltage of mains power, the power supply generally has an isolated primary side and a secondary side, and there is no direct current between the two. The voltage levels on the primary side are referenced to the mains input ground; the voltage levels on the secondary side are referenced to a floating output ground. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 李敬赞林崇伟林扬盛
Owner LEADTREND TECH