Constant-current controller topology circuit powered directly by alternating current power supply for LED lighting lamp

Abstract

The invention relates to a constant-current controller topology circuit powered directly by alternating current power supply for LED lighting lamp. The constant-current controller is used for solving the problem that the efficiency, service life of the lamp and the like are influenced by a driving power supply in a semiconductor lighting lamp. The constant-current controller topology circuit is composed of an EMI (Electro-Magnetic Interference) circuit, a rectification circuit, a power factor correction circuit and a constant-current driving circuit. The output end of the EMI circuit is connected with the input end of the rectification circuit. The power factor correction circuit is provided with two power factor control circuits, and the input ends of the power factor control circuits are connected with the output end of the rectification circuit. The output control ends of the two power factor control circuits are connected to a 1 / 3 string line position and a 2 / 3 string line position of an LED lighting light string respectively. The constant-current circuit is connected between the LED lighting light string and the rectification circuit in series. Proved by the actual detection, by means of the topology circuit, power supply conversion efficiency of the constant-current controller is more than 95%; power factor is more than 0.95; system cost is reduced by 80%; therefore, the service life of the power supply is matched with that of an LED light source; and the long service life of the LED lighting lamp is realized.

Description

technical field [0001] The invention belongs to the technical field of application circuits of semiconductor lighting lamps, and relates to a constant current controller topology for LED lighting lamps directly powered by an AC power supply, which is used to solve the influence of driving power in semiconductor lighting lamps on lamp efficiency, life, cost and volume. circuit. Background technique [0002] Due to its remarkable advantages such as high luminous efficiency, obvious power-saving effect, long life, no pollution, and anti-vibration, LED lighting has been increasingly valued by countries all over the world, and it is expected to completely replace various traditional lighting fixtures in the near future. But at present this lamp still has the following shortcomings in practical application: [0003] 1. The power conversion efficiency is not high: a constant current drive power supply that converts AC power into DC power must be installed in LED lighting fixtures,...

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Problems solved by technology

[0003] 1. The power conversion efficiency is not high: a constant current drive power supply that converts AC power into DC power must be installed in LED lighting fixtures, but the conversion efficiency of this power supply is generally not high. At present, the efficiency of better constant current sources is lower than 85. %;

[0004] 2. The life of the power supply does not match the life of the light source: because the service life of the electrolytic capacitors commonly used in switching power supplies is generally less than 10,000 hours, although the life of the LED light source can reach more than 50,000 hours, the lamp cannot be illuminated after the power supply is damaged. , so the DC drive power supply is also one of the constraints that directly affect the service life of LED lamps;

[0005] 3. It is difficult to reduce the cost of power supply: In recent years, with the popularization and application of LED technology, the price of LED light source has also been greatly reduced. However, due to the high requirements on reliability and life, the cost of driving power supply is difficult to reduce. At present, the cost of driving power in high-power lighting fixtures is close to the cost of LED light sources, so the life and price of driving power have become a major bottleneck restricting the promotion and application of LED lamps.

[0006] 4. Large volume: Since the switching power supply contains large components such as transformers and AC / AC power converters, and the circuit is complex, the switching circuit is bulky

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