LED driving power supply

Abstract

The invention relates to an LED driving power supply, which comprises a first detection circuit, a second detection circuit, a current adjustment control circuit and a current output circuit, wherein the first detection circuit is connected with the current output circuit and the current adjustment control circuit and is also used for connecting a first LED module; the second detection circuit is connected with the current adjustment control circuit and is also used for connecting a second LED module; the current output circuit is connected with a mains power and also connected with the second LED module and the current adjustment control circuit; the first detection circuit and the second detection circuit respectively detect connection states of the first LED module and the second LED module, the connection states are fed back to the current adjustment control circuit, the current adjustment control circuit outputs a control signal to the current output circuit, a first constant current is outputted when the current output circuit receives the control signal, and a second constant current is outputted when the control signal is not received. By adopting a simple electronic element, output of the constant current is controlled according to the load connection state, the cost is low, and the structure is simple.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an LED driving power supply. Background technique [0002] The LED drive power supply is a voltage converter that converts the power supply into a specific voltage and current to drive the LED to emit light. Usually, multiple LED modules in series are driven by the same LED drive power supply, for example figure 1 shown. However, since most of the traditional LED drive power supply is a constant current drive power supply, when one of the LED modules in the multi-channel LED module is damaged, the current output by the LED drive power supply remains unchanged, resulting in the current flowing to other LED modules. Increase, it is easy to cause other LED modules to be overloaded and damaged, thereby accelerating the damage of the entire LED lamp. [0003] There are two traditional methods to solve the problem of mutual influence between the above-mentioned multi-channel LED...

AI Technical Summary

Problems solved by technology

However, since most of the traditional LED drive power supply is a constant current drive power supply, when one of the LED modules in the multi-channel LED module is damaged, the current output by the LED drive power supply remains unchanged, resulting in the current flowing to other LED modules. increase, it is easy to cause other LED modules to be overloaded and damaged, thereby accelerating the damage of the entire LED lamp

[0003] There are two traditional methods to solve the problem of mutual influence between the above-mentioned multi-channel LED modules. One is to use an independent LED driving power supply for each LED module, but the number of LED driving power supplies used is increased, and the cost is high; One is to adopt such as figure 2 The more complex power supply topology shown is adopted, the front end adopts constant voltage topology, and the back end designs a constant current module for each LED module, but the cost is high, the circuit is complicated, and the failure rate caused by it is high

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