A constant power output led driving power supply and constant power output method thereof

Abstract

The invention discloses a constant power output LED drive power supply and a constant power output method thereof. The constant power output LED drive power supply includes an output voltage adjustment module, an output current adjustment module and a control chip, and the control chip is simultaneously connected to the output A voltage adjustment module and an output current adjustment module. The present invention calculates the real-time output power through the control chip, and when the real-time output power is inconsistent with the preset target output power, uses the control chip to control the output voltage adjustment module and the output current adjustment module to adjust the voltage and / or current, so that constant power can be realized Output, avoiding the impact of overvoltage, overcurrent and overshoot voltage on the LED light source when starting up, ensuring the life of the LED light source, thereby ensuring the reliability of lighting, and is conducive to product standardization, convenient for users to choose, and also saves costs.

Description

technical field [0001] The invention relates to the field of LED driving, in particular to a constant power output LED driving power supply and a constant power output method thereof. Background technique [0002] The existing LED driving power is mainly based on a constant current source, which is determined by the volt-ampere characteristics of the LED, which is conducive to the stable operation of the LED light source. Due to the lack of standardization of LED light sources, LED light source combinations with different forward voltage drop values ​​(VF value) and different forward current values ​​(IF value) can be described as everything, so that the corresponding LED power supply needs are varied, which brings great advantages to the design of LED drive power supply. In view of this, a constant current source with a wide output voltage came into being. For example, the output current is 350mA, and the output voltage is 10V-36V. This power supply has the following charac...

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Problems solved by technology

[0003] 1) The output power range is very wide;

[0004] 2) The input power range is very wide;

[0005] 3) There will be excessive voltage and current at the moment of power on, which will have a short current impact on the light source, which will affect the life of the light source

[0006] To a certain extent, it meets the requirements of users, but also brings out some problems. Due to the wide input power range, all design margins are required to be designed according to the maximum value when designing the power supply. No exception, thus causing great waste in most applications, or the product is too large to be installed

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