Intelligent PFC constant-current drive power circuit and control method

Abstract

The invention discloses an intelligent PFC constant-current drive power circuit and a control method. The intelligent PFC constant-current drive power circuit comprises an AC input rectifier filter unit, a PFC power factor correction unit, a high-frequency transformer, an output filter unit, an output unit, a switch circuit, a brightness induction device, an infrared induction device, a time zoneacquisition unit, a sampling unit, a timer and a single-chip microcomputer, wherein the output filter unit is connected with the output unit through a fourth inductor; the output filter unit is connected with the PFC power factor correction unit through a constant-current output sampling unit; the output unit feeds back an output signal to a power supply terminal of a PFC power factor adjustment chip through a secondary protection circuit; the sampling unit acquires an output current signal, is connected with an AD conversion module through a signal sampling circuit and finally acquires a sampled signal; and the single-chip microcomputer is connected with the brightness induction device, the infrared induction device, the time zone acquisition unit, the switch circuit and the AD conversionmodule. The intelligent PFC constant-current drive power circuit has the advantages that intelligent constant-current starting is achieved, and the intelligent PFC constant-current drive power circuit is safer to use and better in constant-current stabilization effect.

Description

technical field [0001] The invention relates to an LED power supply circuit, in particular to an intelligent PFC constant current drive power supply circuit and a control method. Background technique [0002] The LED lamp is an electroluminescent semiconductor material chip, which is cured on the bracket with silver glue or white glue, and then connected to the chip and the circuit board with silver or gold wires, and sealed with epoxy resin around it to protect the inner core wire. Function, and finally install the shell, so the shock resistance of the LED lamp is good. The inherent characteristics of LED determine that it is the most ideal light source to replace the traditional light source, and it has a wide range of uses. LED lights have the following advantages: small size; low power consumption, LED power consumption is quite low, generally speaking, the working voltage of LED is 2-3.6V. The working current is 0.02-0.03A. That is to say: it consumes no more than 0....

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Problems solved by technology

That is to say: it consumes no more than 0.1W of electric energy; it has a long service life, and the service life of the LED can reach 100,000 hours under the appropriate current and voltage; Ordinary lighting fixtures are much lower; environmental protection, LED is made of non-toxic materials, unlike fluorescent lamps containing mercury, which will cause pollution, and LEDs can also be recycled and reused, durable, so they are widely used, and LED drive power is LED lights. The power source, so the quality of the driving power directly affects the stability of the final circuit, and the current LED driving power is powered by the mains, and then manually controlled by the switch, and the switch is a consumable part, which eventually leads to a long-term use. , the switch is easy to break. Once the switch is broken, it needs to be replaced, which is relatively troublesome. In addition, the current LED constant current drive circuit still has a poor driving constant current effect and cannot achieve the expected effect on the later constant current. Therefore, how to design a smart constant current It is particularly important to use circuits that are safer and have better constant current effects

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