Temperature control protection drive circuit for LED bulb lamp

Abstract

The invention discloses a temperature control protection drive circuit for an LED bulb lamp. The temperature control protection drive circuit comprises a constant-current drive circuit, a temperaturecontrol protection circuit and a power supply circuit, wherein the constant-current drive circuit is provided with a constant-current control chip; the temperature control protection circuit comprisesa first triode, a second triode, a negative temperature coefficient thermistor, a first resistor, a second resistor and a third resistor; the negative temperature coefficient thermistor is arranged on an LED light source or a drive power supply; a collector of the first triode is connected with a compensation end of the constant-current control chip, an emitter is grounded through the first resistor and a base is connected with the collector of the second triode and one end of the second resistor separately; the other end of the second resistor is connected with one end of the third resistor;a common connection end of the third resistor is connected with the power supply circuit; the other end of the third resistor is connected with the base of the second triode and one end of the negative temperature coefficient thermistor separately; and the other end of the negative temperature coefficient thermistor is connected with the emitter of the second triode and is grounded. The temperature control protection drive circuit has the advantages of being simple in structure and low in cost.

Description

technical field [0001] The invention relates to a driving circuit for an LED lamp, in particular to a temperature control and protection driving circuit for an LED bulb lamp. Background technique [0002] With the in-depth development of national energy conservation and emission reduction and the maturity of LED technology, LED has gradually replaced traditional incandescent and fluorescent lamps and has been widely used in ordinary people's family life. LED bulbs are the most widely used because of their similar appearance to traditional incandescent lamps, simple structure and low price. [0003] Existing LED bulb lamps generally include a light-transmitting cover, an LED light source board, a driving power supply, a lamp body, and a lamp cap. On the narrow mouth end of the lamp body, the driving power is installed inside the lamp body, the LED light source board is installed on the wide mouth end of the lamp body, and the light transmission cover is connected to the wide...

AI Technical Summary

Problems solved by technology

Although it effectively prevents the LED light source and drive power from overheating, the temperature protection circuit uses a temperature detection and control circuit and a complex peripheral control circuit, the structure is relatively complex, and the price is high.

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