Load detection circuit and power supply system

A load detection and circuit technology, applied in the electronic field, can solve the problems of inability to judge the load status of the switching power supply, the judgment basis of the switching power supply, and the large output signal.

Active Publication Date: 2021-08-13
GREAT WALL POWER SUPPLY TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the switching power supply is in a heavy-duty state, the output signal of the switching power supply is relatively large. At this time, the output signal of the switching power supply will be too large and exceed the working range of the sampling resistor after being amplified by the two-stage amplifier circuit. At this time, the sampling resistor cannot work normally. work, the current value of the sampling resistor cannot be used as the basis for judging the load status of the switching power supply, which will cause the controller to be unable to judge the load status of the switching power supply

Method used

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Embodiment Construction

[0071] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0072] It should be understood that the "plurality" mentioned in this application means two or more. In the description of this application, unless otherwise specified, " / " means or means, for example, A / B can mean A or B; "and / or" in this article is just a description of the relationship between associated objects, It means that there can be three kinds of relationships, for example, A and / or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in order to clearly describe the technical solution of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can unde...

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PUM

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Abstract

The invention discloses a load detection circuit and a power supply system, and belongs to the technical field of electronics. The load detection circuit comprises a first amplification circuit, a first conversion circuit, a second amplification circuit, a second conversion circuit and a controller, wherein the first amplification circuit is used for collecting an output signal of a switching power supply and performing primary amplification, the second amplification circuit is used for performing secondary amplification on a voltage signal output by the first amplification circuit, and the first conversion circuit and the second conversion circuit are respectively used for converting the voltage signal subjected to primary amplification and the voltage signal subjected to secondary amplification into a current signal. After the controller detects a first current value of the first conversion circuit and a second current value of the second conversion circuit, the load state of the switching power supply is judged according to the first current value and the second current value. The load detection circuit can enlarge the effective acquisition range of the output signal of the switching power supply, so that the controller can accurately judge the load state of the switching power supply.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to a load detection circuit and a power supply system. Background technique [0002] Switching power supply is a high-frequency power conversion device that can convert a standard voltage into the voltage or current required by the user. The switching power supply includes a switching tube, and the output signal of the switching power supply can be adjusted by adjusting the ratio of the closing and opening time of the switching tube. Switching power supplies have different working modes. In different working modes, the time ratios of the switching tubes being closed and disconnected are different, and the magnitudes of the output signals of the switching power supply are also different. [0003] The load state of the switching power supply includes light load and heavy load, and the output signal of the switching power supply required by different load states is diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165
CPCG01R19/16571
Inventor 兰勇孙用刚吕万德
Owner GREAT WALL POWER SUPPLY TECH CO LTD
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