High-power factor light-emitting diode driving circuit structure

Abstract

The invention relates to a high-power factor light-emitting diode driving circuit structure and belongs to the technical field of a circuit structure. A driving control circuit module of the high-power factor light-emitting diode driving circuit structure controls the duty cycle of a switch of a power pipe by converting a negative voltage signal of an auxiliary winding which is acquired by sampling through a negative voltage signal sampling end into a corresponding current signal to characterize the voltage of a bus, so that a current peak value envelope extracted by the high-power factor light-emitting diode driving circuit structure from an alternating-current voltage source is enveloped into a sine waveform and has the same phase as the voltage of the structure, a bus voltage sampling circuit is not required, a sampling input pipe pin of a control circuit is eliminated, the cost of the circuit structure is effectively reduced, the standby power consumption of the circuit is reduced, the volume miniaturization of a whole machine is facilitated, and the control on the decreasing of the area of the circuit and the enriching of the functions of the circuit are also facilitated. The high-power factor light-emitting diode driving circuit structure is relatively wide in application range.

Description

technical field [0001] The invention relates to the technical field of circuit structures, in particular to the technical field of driving circuit structures, and in particular to a high power factor light emitting diode driving circuit structure. Background technique [0002] With the development of LED technology, LED lighting has gradually become the mainstream of energy-saving and green lighting. For the LED connected to the AC power grid, the power factor has certain requirements. If the power factor is not enough, it will cause certain pollution to the power grid. Today, both Europe and the United States have made clear power factor requirements for LED bulbs connected to the grid. [0003] The traditional flyback LED drive structure with power factor correction (PFC) adopts the method of sampling the input AC voltage signal from the rectified bus by the sampling circuit, and then controls the duty cycle of the power tube switch through the internal multiplier to achi...

AI Technical Summary

Problems solved by technology

Due to the existence of sampling resistors R5 and R6, the standby power consumption of the drive circuit will be increased, especially in the case of high AC input voltage, and it also limits the miniaturization of the whole machine

Due to the need for a separate control circuit pin, it is not conducive to the reduction of the control circuit area and the richness of functions

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