Drive power supply with high efficiency, long service life and low cost for LED (light-emitting diode) lighting energy-saving lamp

Abstract

The invention relates to a drive power supply with high efficiency, long service life and low cost for an LED (light-emitting diode) lightening energy-saving lamp. The drive power supply is completely free of an electrolytic capacitor, an output inductor and an output transformer. The drive power supply comprises a half bridge conversion circuit, a voltage reduction current-limiting circuit and an output circuit, wherein one end of the half bridge conversion circuit is connected with a power supply, and the other end of the half bridge conversion circuit is connected with the voltage reduction current-limiting circuit; the output circuit is connected with the other end of the voltage reduction current-limiting circuit; the voltage reduction current-limiting circuit is connected between an end 1 of the half bridge conversion circuit B1 and an anode of the output circuit D3 in series; the voltage reduction current-limiting circuit comprises a capacitor and a resistor for reducing voltage and limiting current; the capacitor and the resistor are connected in parallel; when a direct-current or pulsed direct-current power supply is input in the circuit, the current transformation and initial voltage reduction are firstly realized through the half bridge conversion circuit, the secondary voltage reduction is realized through the voltage reduction current-limiting circuit, and the required low-voltage direct current is output by the output circuit to drive an LED to emit light. In the whole circuit, the overall service life of the LED lighting energy-saving lamp can reach, even exceed 35000 hours just by using the elements with small volume and low cost.

Description

Technical field [0001] The invention relates to an LED lighting energy-saving lamp, in particular to a high-efficiency, long-life and low-cost LED lighting energy-saving lamp driving power supply that does not use electrolytic capacitors, output inductors and output transformers. Background technique [0002] At present, most of the known LED lighting energy-saving lamp driving power supplies use electrolytic capacitors, high-frequency magnetic core inductance step-down energy storage components and output transformers, which have many disadvantages, mainly: 1. The circuit topology is too complicated; 2. , The circuit cost is high, the efficiency is very low, and the volume is large; 3. The circuit has a short service life, resulting in the current LED lighting lamp on the market, which can hardly reach the minimum 35,000 hours. Summary of the invention [0003] In order to overcome the above-mentioned drawbacks, the present invention provides a high-efficiency, long-life, low-cos...

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Problems solved by technology

[0002] At present, most of the known driving power supplies for LED lighting energy-saving lamps use electrolytic capacitors, high-frequency magnetic core inductance step-down energy storage components and output transformers, which have many disadvantages, mainly including: 1. The circuit topology is too complicated; 2. 1. The cost of the circuit is high, the efficiency is very low and the volume is large; 3. The service life of the circuit is short, so that the service life of the LED lighting lamps currently on the market can hardly reach the minimum 35,000 hours

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