Overvoltage protection circuit and lamp

Abstract

The invention proposes an overvoltage protection circuit connected between a DC power supply and a load. The overvoltage protection circuit comprises a voltage feedback unit, an overvoltage locking unit and an open circuit control unit, wherein the voltage feedback unit is used for monitoring whether the voltage of the circuit is beyond a set threshold value or not; the input end of the overvoltage locking unit is connected with the output end of the voltage feedback unit; the open circuit control unit is used for controlling the connection of the DC power supply and the load, the control end of the open circuit control unit is connected with the output end of the overvoltage locking unit, the input end of the open circuit control unit is connected with the DC power supply, the output end of the open circuit control unit is connected with the input end of the voltage feedback unit, and a second output end of the open circuit control unit is grounded; and when the voltage feedback unit monitors that the voltage of the output end of the DC power supply is higher than the threshold value, the overvoltage locking unit controls the open circuit control unit to cut off the connection of the DC power supply and the load. The invention also proposes a lamp. With the adoption of the overvoltage protection circuit, the circuit and the load can be protected when the voltage of the circuit is beyond the threshold value.

Description

technical field [0001] The invention relates to a protection circuit, in particular to an overvoltage protection circuit and a lamp. Background technique [0002] In the prior art, the output voltage of the DC power supply circuit easily exceeds a set value, causing damage to both the circuit and the load. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose an overvoltage protection circuit and a lamp, which can solve the problem of damage to the circuit and load caused by the output power of the DC power supply circuit exceeding the set value. [0004] In order to solve the above-mentioned technical problems, the present invention proposes an overvoltage protection circuit, which is connected between a DC power supply and a load, and includes: a voltage feedback unit, which is used to monitor whether the voltage of the circuit exceeds a set threshold va...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art, and propose an overvoltage protection circuit and a lamp, which can solve the problem of damage to the circuit and load caused by the output power of the DC power supply circuit exceeding the set value

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