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Power circuit and input limiting resistor determining method

A technology for power supply circuits and limiting resistance, which is applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., and can solve problems such as high cost and poor reliability

Pending Publication Date: 2019-04-19
佛山市汉立电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, it is necessary to provide a method for determining the power supply circuit and input limiting resistance for the problems of poor reliability and high cost of the traditional power supply circuit

Method used

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  • Power circuit and input limiting resistor determining method
  • Power circuit and input limiting resistor determining method

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Embodiment Construction

[0052] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. A preferred embodiment of the application is shown in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0053] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to and integrated with the other element, or there may be intervening elements at the same time. The terms "mounted", "one end", "the other end" and similar expressions are used herein for the purpose of description only.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood ...

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Abstract

The invention relates to a power supply circuit and an input limiting resistor determining method. A power source chip is connected to a power supply system through an input limiting resistor, whereinthe input limiting resistor is the resistor with a specific resistance range. During occurrence of lightning current, the lightning current is limited by the input limiting resistor to prevent component damages. Similarly, since the surging current is less than or equal to the lightning current, the surging current can be limited by the input limiting resistor. Further, by inputting the impedanceof the limiting resistor, the differential mode interference conducted by the power supply circuit to the power supply system is suppressed, and the function of improving the EMC is achieved. Thus, the protection function of the power supply circuit is realized by the input limiting resistor, the reliability of the power supply circuit is improved and the cost of the circuit is reduced.

Description

technical field [0001] The invention relates to the technical field of power supply circuits, in particular to a power supply circuit and a method for determining an input limiting resistance. Background technique [0002] The power circuit is a power conversion device, which is used to output the converted power to electrical equipment. Generally, the power supply circuit includes a main circuit and a protection circuit. The input end of the main circuit is connected to the power supply system through the protection circuit, and receives and converts power from the power supply system. Wherein, the protection circuit of the traditional power supply circuit is used for anti-lightning strike, suppression of surge and improvement of EMC (Electro Magnetic Compatibility, electromagnetic compatibility). [0003] The traditional power supply circuit generally uses varistors connected in parallel between the input terminals of the main circuit to resist lightning strikes; realizes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02H9/02
CPCH02H9/02H02M7/217
Inventor 杨义根温小清
Owner 佛山市汉立电子科技有限公司
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