Overvoltage protection circuit and load voltage regulation circuit

An overvoltage protection circuit and circuit technology, applied in emergency protection circuit devices, protection against overvoltage, and adjustment of electrical variables, etc., can solve poor compatibility, increase power consumption and component costs, and unfavorable load constant voltage regulation and other issues to achieve good compatibility
CN106711935BActive Publication Date: 2020-07-31JOULWATT TECH INC LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JOULWATT TECH INC LTD
Publication Date
2020-07-31

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Abstract

The invention discloses an overvoltage protection circuit and a load voltage regulation circuit. The overvoltage protection circuit comprises a voltage division sampling circuit and a comparison circuit, wherein both ends of the voltage division sampling circuit are respectively connected with both ends of a load, and the sampling output end of the voltage division sampling circuit is used for outputting sampling voltage signals which are used for expressing voltage values at the two ends of the load; a first input end of the comparison circuit is used for receiving the sampling voltage signals, a second input end of the comparison circuit is used for receiving a reference signal, and the reference signal is high-end voltage or low-end voltage of the load; the sampling voltage signals are compared with the reference signal in the comparison circuit; when overvoltage occurs, the output end of the comparison circuit is used for converting high and low levels. The overvoltage protection circuit has the advantages that by using an operation amplifier as the comparison circuit, the load voltage can be regulated to maintain the constant voltage of the load; the overvoltage protection circuit is suitable for multiple topology structures, the compatibility is good, and the complicated peripheral circuit is not needed.
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Description

technical field

[0001] The invention relates to the technical field of power electronics, in particular to an overvoltage protection circuit and a load voltage regulation circuit. Background technique

[0002] LED driving circuits in the prior art can generally be applied to various LED driving topologies, such as Buck, Boost, Buck-Boost, and so on. Since an overvoltage protection circuit needs to be provided on the basis of the LED driving circuit, corresponding peripheral circuits need to be provided to cooperate with it.

[0003] The overvoltage protection circuit in the prior art generally samples the output voltage of the LED driving circuit through a voltage divider circuit, and compares the sampled signal with the internal reference of the chip to determine whether it is overvoltage. However, since the reference inside the chip is fixed, in the application of different topologies, in the case of different loads, the judgment reference of overvoltage is actually diffe...

Claims

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