LED driving power supply with constant-power output and constant-power output method thereof

Abstract

The invention discloses an LED driving power supply with constant-power output and a constant-power output method thereof. The LED driving power supply with constant-power output comprises an output voltage adjusting module, an output current adjusting module and a control chip, and the control chip is connected with the output voltage adjusting module and the output current adjusting module. According to the LED driving power supply, the real-time output power is realized through the control chip, and the output voltage adjusting module and the output current adjusting module are controlled to perform voltage and / or current adjustment by employing the control chip when the real-time output power is inconsistent with a preset target output power so that constant-power output can be realized, the impact of overvoltage, overcurrent and overshoot voltage on an LED light source during power-on is avoided, the lifetime of the LED light source is guaranteed, the illumination reliability is guaranteed, product standardization is facilitated, users can conveniently make choices, and the cost is lowered.

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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