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Over-current protection method and device

An overcurrent protection and protection period technology, applied in emergency protection circuit devices, automatic disconnection emergency protection devices, circuit devices, etc., can solve problems such as sudden capacitive load, equipment shutdown, and user-side equipment not working properly.

Active Publication Date: 2022-05-13
HEFEI KEWELL POWER SYST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when the output voltage has been established in this protection mode, if a capacitive load is suddenly added, it is easy to cause the device to report output overcurrent protection and shut down, resulting in the failure of the user's device to work normally.

Method used

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Embodiment Construction

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. 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.

[0053] Such as figure 1 As shown, the first embodiment of the present invention discloses an overcurrent protection method for execution on an MCU device, and the method includes the following steps:

[0054] S10, sampling to obtain the output current value Io of the power supply;

[0055]S20, judging whether Io≥IF is satisfied, IF is the fast protection threshold, if so, execu...

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Abstract

The invention discloses an overcurrent protection method and device, and the method comprises the steps: comparing a power supply output current value Io with a fast protection threshold IF and a slow protection threshold IS which are set in advance, and if the Io is greater than the fast protection threshold, an MCU immediately blocks a PWM generator, and carries out the wave sealing protection; if the Io is between the IS and the IF, the MCU does not immediately block the PWM generator, and when it is detected that the Io is between the IS and the IF in continuous a switching periods, the PWM generator is blocked, and wave sealing protection is carried out. The power supply output current value is logically processed according to the protection parameters, so that multi-stage and time-sharing protection is effectively realized, rapid protection during high impact current is ensured, and normal work and no error protection during low impact current can be realized.

Description

technical field [0001] The invention relates to the technical field of electronic equipment for measurement and testing, in particular to an overcurrent protection method and device. Background technique [0002] At present, the following methods are mostly used in the power supply output overcurrent protection method: [0003] (1) The hardware samples the output current value, and compares it with the protection reference voltage through a comparator, thereby realizing fast protection, such as an overcurrent protection circuit disclosed in an invention patent application with a publication number of CN1848577A, which uses a hardware circuit to realize overcurrent protection , the advantage is that it can be quickly protected, and the disadvantage is that it is not flexible enough. Once the hardware parameters are determined, the protection threshold is also determined, and multiple thresholds cannot be set to achieve multi-level protection. In addition, since this method u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087H02H7/12
CPCH02H3/087H02H7/12
Inventor 钟钢炜赵涛陈亚东蔡振鸿唐德平
Owner HEFEI KEWELL POWER SYST CO LTD
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