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Overvoltage protection control method and related power controller

A technology of power controller and protection control, which is applied to emergency protection circuit devices, electrical components, etc., and can solve problems such as electric shock

Active Publication Date: 2018-09-07
NANJING GREENCHIP SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, in case a person touches the two terminals of the LED module 14, there is a risk of electric shock

Method used

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  • Overvoltage protection control method and related power controller
  • Overvoltage protection control method and related power controller
  • Overvoltage protection control method and related power controller

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Experimental program
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Embodiment Construction

[0033] although figure 1 The power converter 10 in the present invention can provide an OVP mechanism, but the power converter 10 needs a transformer composed of a primary winding PRM and a secondary winding SEC. Compared with ordinary inductors, transformers are relatively large and expensive.

[0034] In this specification, elements with the same reference number represent elements with the same or similar functions, and their details and changes can be deduced by those skilled in the art according to this specification, so they are not necessarily described in detail in this specification.

[0035] figure 2 For example, a power converter 60 implemented according to the present invention has an inductor L replacing figure 1 in the transformer. The power converter 60 can achieve the function of OVP without a transformer. However, this does not limit embodiments of the present invention to having no transformers. For example, in some embodiments, the inductor L may belon...

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PUM

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Abstract

Embodiments of the present invention disclose an overvoltage protection control method, which is suitable for a power converter, which includes a rectifier for rectifying an AC voltage into a rectified DC voltage. The overvoltage control method includes: determining whether the rectified DC voltage is at a local minimum value; providing a detection voltage that can represent the rectified DC voltage; comparing the detection voltage with an overvoltage reference voltage; and, when the When the rectified DC power supply is at the local minimum value and the detection voltage is lower than the overvoltage reference voltage, an overvoltage protection signal is provided to stop the power conversion of the power converter.

Description

technical field [0001] The techniques disclosed in this specification are generally related to overvoltage protection of power converters. Background technique [0002] All power converters need to be equipped with some protection functions to prevent harm to the human body or the environment when abnormal events occur. For example, a power converter that drives a light emitting diode (light emitting diode) for lighting needs to have an over voltage protection (over voltage protection, OVP) function to prevent excessive output voltage from causing harm to the human body. shock. [0003] figure 1 is a known power converter 10 . The bridge rectifier 12 provides the function of full-wave rectification, and the AC voltage V AC is the input to generate rectified DC voltage V IN and a ground wire. The power converter 10 is a step-down converter, and its LED module 14 is used as a load, connected in series with the main winding PRM of the transformer, and connected to the rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/125
Inventor 杨镇纶陈仁义周顺钦
Owner NANJING GREENCHIP SEMICON CO LTD