LED constant current source output short circuit protection circuit
A short-circuit protection circuit and output short-circuit technology, which is applied to emergency protection circuit devices, overcurrent-responsive protection, circuit devices, etc., can solve problems such as complex circuits, inability to automatically recover, and many electronic components, and achieve circuit structure The effect of simplicity, low power consumption, and fewer electronic components
Inactive Publication Date: 2010-08-25
MOSO POWER SUPPLY TECH
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Problems solved by technology
In order to solve the problem that the circuit is complex, there are many electronic components, and there is no automatic recovery when the short circuit is eliminated, the present invention designs a short circuit protection circuit. The circuit provided by the present invention can not only effectively protect the power supply from being damaged, but also effectively Electronic components in the protection circuit
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The invention relates to an LED constant current source output short circuit protection circuit which comprises an LED constant current source, a micro control unit and a PWM controller; a current signal is sequentially transmitted to the PWM controller and the LED constant current source through the micro control unit; the circuit is characterized by further comprising a switch circuit with an automatic recovery function; one end of the switch circuit with the automatic recovery function is connected with the PWM controller, and the other end thereof is connected with the LED constant current source so as to realize short-circuit protection; when the circular works normally, an MOS pipe Q4 is communicated with an MOS pipe Q3; when short circuit occurs, the MOS pipe Q4 is stopped, the MOS pipe Q3 is stopped, and the current of an LED lamp is stopped; when short circuit is eliminated, the protection circuit automatically starts the recovery circuit, so that the circuit returns to the working state; and the protection circuit provided by the invention not only protects the constant current source but also has the automatic recovery function.
Description
A LED constant current source output short circuit protection circuit technical field The invention relates to a power supply protection circuit, in particular to a constant current source protection circuit. Background technique In the field of power supply, in order to increase the life of the power supply, the output short circuit protection circuit is generally designed to prevent the power supply and the load from being damaged by excessive working current when the power supply is short circuited. The quality of the short circuit protection circuit directly affects the reliability of the entire power supply. U.S. Patent No. 5,400,206 "Short circuit and overload protection circuit which allows sa pre determined number of reconnection attempts" adopts a short circuit protection circuit that can preset the number of short circuit recovery attempts, and uses a counter that can be set to limit the number of short circuit recovery attempts and time. When the protection acti...
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IPC IPC(8): H05B37/00H02H3/08H02H3/06
Inventor 顾永德
Owner MOSO POWER SUPPLY TECH