Eliminate the constant current power supply for LED lamps with dimmable 12 volt incandescent lamps

Abstract

The invention discloses a constant-current power supply for LED lamps that eliminates dimmable 12-volt incandescent lamps, including: an AC power supply circuit, a control circuit, a coupling output circuit, and a ripple suppression circuit; the AC power supply circuit is connected to a 12-volt AC power supply Uin, including: The AC positive half-wave current loop and the AC negative half-wave current loop controlled by the constant current driver chips U1 and U2; the control circuit includes the control circuits of the constant current driver chips U1 and U2; the coupling output circuit integrates the magnetically integrated transformer TR. The induced secondary current generated by the secondary winding N2 of the column is output to the load LED lamp after being rectified and filtered; the ripple suppression circuit recovers harmonic THD and electromagnetic interference EMI, and is output to the load LED lamp after rectification; the constant current driver chip U1 And U2 is DU8968 integrated chip. The constant current power supply of the present invention is suitable for 12 volt AC power supply, the highest energy saving can reach 95%, the electric power is improved without using bridge rectification, the reliability is improved without using electrolytic capacitors, the constant current precision is high, the current ripple is small, and LED The light does not flicker, and the circuit is environmentally friendly.

Description

technical field [0001] The invention belongs to the LED lamp constant-current power supply technology, in particular to an LED lamp constant-current power supply for eliminating dimmable 12-volt incandescent lamps. Background technique [0002] The luminous efficacy of an incandescent bulb is 15 lumens per watt. On April 3, 2014, CREE announced that it supplied 350 milliamperes of direct current to LED lamp beads with a color temperature of 5150 degrees K, and the measured LED luminous efficacy was 303 lumens! In other words, LED lamps only need 5% of the power consumption of incandescent lamps to get the same lumens as incandescent lamps. Replacing traditional incandescent bulbs with high-efficiency LED lights can save 95% of the energy. Governments around the world have formally legislated to stop production and sales of incandescent bulbs, just for the sake of carbon reduction and environmental protection. [0003] For non-dimmable high-voltage incandescent bulbs, repla...

AI Technical Summary

Problems solved by technology

However, it is not easy to replace the 12-volt low-voltage incandescent bulbs with LED lights for thyristor dimming

Various integrated circuit companies researched and developed special-purpose integrated circuits for LED lamps, such as the AC / DC quasi-resonant high power factor constant-current LED controllable LED lights produced by Shanghai Duty Cycle Electronic Technology Co., Ltd. Silicon dimming driver chip DU8968, but at present, including DU8968, most of the integrated chips specially used for thyristor dimming LED lamps are only suitable for high-voltage AC power supplies above 100 volts, and are not suitable for 12-volt low-voltage power supplies. The voltage drop of the type rectifier itself leads to a power drop, and the voltage of the full-load LED lamp may far exceed 12 volts. Therefore, it has become a globally recognized problem to replace the 12 volt low-voltage incandescent bulbs dimmed by silicon controlled rectifiers with LED lights.

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