LED lamp overheating voltage reduction circuit

Abstract

The invention relates to an LED lamp overheating voltage reduction circuit used for a voltage type switch power supply. The LED lamp overheating voltage reduction circuit comprises a switch power supply main circuit, a voltage stabilizing sampling circuit, comparison unidirectional amplification, reference, signal processing, and a temperature sensor. The temperature sensor is used to detect temperature of an LED lamp adopting power provided by the switch power supply, and is connected with the signal processing. The signal processing is used to convert the temperature into voltage, and is connected with one input end of the comparison unidirectional amplification. The reference is used to generate a threshold voltage, and is connected with the other input end of the comparison unidirectional amplification. The comparison unidirectional amplification is used to compare the voltages of the two input ends, and when a unidirectional output requirement is satisfied, the comparison unidirectional amplification is used to output the amplified difference value between the voltages of the two input ends, and is connected with the voltage stabilizing sampling circuit, and is used to drive the voltage stabilizing sampling circuit. The voltage stabilizing sampling circuit is used to control the main circuit of the switch power supply, and the direct current voltage output by the switch power supply is reduced according to the temperature rising linearity of the temperature sensor, and objects of reducing the temperature of the LED lamp and prolonging the service lifetime of the LED lamp are achieved.

Description

technical field [0001] The invention belongs to the field of switching power supplies, and in particular relates to an LED lamp overheating step-down circuit for a voltage-type switching power supply. Background technique [0002] With the advantages of high efficiency, energy saving and environmental protection, LED lamps provide high-quality light sources for human lighting. With the different application requirements of LED lamps in various fields, LED lamp drive power is also constantly improving and developing. Switching power supplies with low power consumption , The advantage of high efficiency is widely used in LED lamp driving. The switching power supply used to drive LED lamps also has constant current switching power supply and constant voltage switching power supply. Each has its own shortcomings when driving LED lights. [0003] The main disadvantages of constant current switching power supply driving LED lamps are as follows: When connecting in series, if one o...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantages of constant current switching power supply driving LED lights are as follows: When connecting in series, if one of the LEDs is open, the other LEDs in series will not work.

[0004] The main disadvantages of constant voltage switching power supply driving LED lights are as follows: LED is a diode, its volt-ampere characteristic has a negative temperature coefficient, its own efficiency is very low, and the temperature rise is very high, which can easily rise to eighty or ninety degrees Above, when the temperature rises, the current will increase, but its brightness will not increase, and the increase of current will only make its temperature rise higher, which will increase the light decay and reduce the life span

Images