Switching power supply with overpower protection

An over-power protection, switching power supply technology, applied in emergency protection circuit devices, output power conversion devices, DC power input conversion to DC power output and other directions, can solve problems such as power failure, insufficient accuracy, voltage threshold deviation, etc. The effect of improving reliability and improving accuracy

Pending Publication Date: 2021-10-26
XIAMEN CITY KELI ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to production process problems, there will be deviations between each sampling resistor and the voltage threshold inside the control module; Good for power supply reliability and problems that can easily lead to power failure
[0004] In summary, the switching power supply with overpower protection in the prior art still needs further improvement

Method used

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  • Switching power supply with overpower protection
  • Switching power supply with overpower protection
  • Switching power supply with overpower protection

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Embodiment Construction

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the invention and should not be seen as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0045] In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, the terms "first", "second" or "third" are used to distinguish different objects, not for Describe a specific order.

[0046] In the claims, specification and above-mentioned drawings of the present invention, unless otherwise clearly defined, for orientation words, such as using the terms "center", "transverse", "longit...

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Abstract

The invention discloses a switching power supply with an overpower protection function. The switching power supply comprises a control module, a voltage stabilizing module and an overpower protection module; the control module comprises a first chip; the first chip is provided with a sampling end, a feedback end and an output end; the control module is used for outputting PWM waves with different duty ratios by comparing voltage values of a sampling end and a feedback end of the PWM module so as to control the controllable switch; when the voltage value of the feedback end is reduced, the duty ratio is increased; when the voltage value of the sampling end is greater than a first voltage threshold value, the working is stopped; the voltage stabilizing module is used for lowering the voltage value of the feedback end of the first chip when the output power of the switching power supply is increased; and an overpower protection module is connected in series between the feedback end and the sampling end of the first chip and is used for increasing the voltage value of the sampling end of the first chip when the voltage value of the feedback end of the first chip is smaller than a second voltage threshold value, so that the first chip stops working, and the overpower protection precision is further improved.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a switching power supply with overpower protection. Background technique [0002] In the existing switching power supply system, in order to improve the stability of the system, an overpower protection module is often installed. The usual practice of the overpower protection module is to connect the sampling terminal of the control module with a sampling resistor; when a current flows through the sampling resistor, a voltage drop will be generated at the sampling terminal of the control module, and the voltage drop is compared with the internal voltage threshold Comparison, and when the voltage at the sampling terminal exceeds its internal voltage threshold, the main control chip will stop working to achieve the effect of over-power protection. [0003] However, due to production process problems, there will be deviations between each sampling resistor and the v...

Claims

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Application Information

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IPC IPC(8): H02H7/12H02M1/00H02M1/08H02M1/14H02M1/32H02M3/335
CPCH02H7/1203H02M1/00H02M3/33569H02M1/08H02M1/32H02M1/14
Inventor 翁贵聪李俊需伍佼张志伟王其才徐进远
Owner XIAMEN CITY KELI ELECTRONICS
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