Internal step-down circuit structure of LED driving power source

Abstract

The invention discloses an internal step-down circuit structure of an LED driving power source. According to the internal step-down circuit structure, a rectifier bridge circuit (1) is connected with a high voltage pre-step-down circuit (2); the high voltage pre-step-down circuit (2) is connected with a linear voltage stabilization circuit (5), a hysteresis detection circuit (3) and a pre-posed reference voltage circuit (4); the hysteresis detection circuit (3) detects and compares the voltage of the high voltage pre-step-down circuit (2) so as to control the on-off of the high voltage pre-step-down circuit (2); the pre-posed reference voltage circuit (4) outputs a reference voltage which does not fluctuate with an input power source, does not change with temperature and is adopted as the reference voltage of the hysteresis detection circuit (3) and the linear voltage stabilization circuit (5); and the linear voltage stabilization circuit (5) performs voltage stabilization on the output voltage of the high voltage pre-step-down circuit (2). According to an internal step-down circuit structure of an LED driving circuit in the prior art, a buck-type DCDC circuit is adopted to decrease voltage or a high-frequency transformer is adopted to decrease voltage, and as a result, technical problems such as large size and little possibility of chip integration can be brought about, while, with the internal step-down circuit structure of the LED driving power source adopted, the above problems can be solved.

Description

technical field [0001] The invention belongs to the LED driving power supply technology, in particular to an internal step-down circuit structure of the LED driving power supply. Background technique [0002] In the 21st century, as a solid-state light source, LED is a typical green lighting source, which has the characteristics of long life, high luminous efficiency, and low power consumption. In LED lighting technology, the driving of the power supply is very important, which involves the service life of the LED lamp and various electrical properties. LED driving power is generally divided into external application power and internal power. The external application power supply mainly provides the working power for the LED light source and the working voltage of the peripheral circuit of the drive chip, which is generally high voltage; while the internal power supply provides the working power for the chip as the low-voltage modules inside the chip such as bandgap referen...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an internal step-down circuit structure of the LED drive power supply, so as to solve the problem that the internal step-down circuit of the LED drive circuit in the prior art uses a buck type DCDC circuit to step down or uses a high-frequency transformer to reduce the voltage Reduced and other methods, the circuit is large and not easy to integrate into the chip and other technical problems

Images