Power integrated circuit for LED lighting

Abstract

The present invention relates to a power integrated circuit for LED lighting. When alternating current power is inputted, a rectifier rectifies the alternating current power and outputs direct current power which is not smoothened. PWM control is performed, using a DC / DC converter, on the alternating current power which is not smoothened or on smoothened power, so as to step down a voltage to be suitable for a Vf value of all of the LED groups, respectively. Then, an LED group, which has a Vf value corresponding to the voltage outputted by the DC / DC converter in synchronization with the voltage phases corresponding to each LED Vf value, is selected and turned on. Thus, LEDs for lighting can be driven without using an electrolytic condenser or a transformer used in conventional techniques. As a result, the lifespan of a power integrated circuit for LED lighting is remarkably elongated. In addition, the power integrated circuit of the present invention measures the temperature of a lighting device, and automatically cuts off the current flowing to the LED groups when the measured temperature is higher than a preset temperature level, thus preventing the entirety of the power integrated circuit for LED lighting from being degraded by excessive rises in temperature.

Description

technical field [0001] The present invention relates to an LED lighting, in particular to a power supply integrated circuit for LED lighting. Background technique [0002] In recent years, interest in LED lighting, which can achieve brightness higher than incandescent lamps with only a small amount of power consumption, has increased. In addition, people are actively carrying out the research and development of the LED lighting driving device. The LED lighting driving device makes a certain current flow in the LED lighting by controlling the current to drive the LED lighting. This LED lighting driving device has various lighting display functions, especially by changing the dimming of the LED elements arranged in a series-parallel connection, it can perform various lighting displays. [0003] The driving method of the LED element used in the existing LED lighting device controls the current applied to the LED element through the PWM control method, thereby intermittently tu...

AI Technical Summary

Problems solved by technology

[0005] However, the electrolytic capacitors used in the prior art are bulky, and it is difficult to miniaturize the size of the driving circuit for driving LED lighting equipment, and the life of components such as capacitors is short, which will cause the problem of shortening the life of the overall LED driving circuit.

[0006] In addition, compared with other components, the transformer used in the prior art is relatively large in size and has problems in efficiency, and it is difficult to miniaturize the driving circuit.

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