For life-limiting shortcomings of conventional electrolytic capacitors LED drive circuit, a design method of a non-electrolytic capacitor LED drive circuit. The method adopts a chip of Panasonic Panasonic MIP553 built-in PFC dimmable LED driving circuit, and is synthesized with an external non-isolated bottom edge chopper circuit as a basic circuit structure, and outputs a stable current to meet the needs of LED operation. At the same time, a protection circuit is designed to protect the load. The experimental results show that the controller chip can work stably and can achieve a constant voltage output of 27V and a constant current output of 350mA.
LED (Light Emitting Diode) has become a new generation of green lighting source with its advantages of energy saving, environmental protection, high brightness and long life. As LED lighting technology matures, it will eventually be used in all aspects of life and become the new darling of lighting sources. However, high efficiency, low cost, high power factor and long life drive power are the key to LED light quality and overall performance.
The LED lamp that replaces the general bulb on the market today is about 40 times longer than the life of an incandescent bulb, which is equivalent to 40,000 hours. Since the LED is a direct current driving part, the electric current is directly converted into light energy by the current flowing, and is therefore also called a photoelectric converter. Since there is no friction or mechanical loss, it is more efficient in energy saving than a general light source. However, when the AC power is turned on, it is generally a DC stabilized power supply using a rectifying part and a smoothing circuit. The electrolytic capacitor necessary in the smoothing circuit rises by 10 ° C due to the surrounding temperature and its own heat, resulting in a halving of the life. Therefore, electrolytic capacitors hinder the life of LED lighting fixtures.
In order to improve the life of the driving power supply, simplify the circuit, reduce the cost, and increase the power density, it is necessary to remove the electrolytic capacitor. For this reason, a high-brightness LED driving power source without an electrolytic capacitor is proposed.
The basic working principle of 1LED power supply
The BUCK converter and IPD control are used to realize the switching power supply, and output constant current and voltage to drive the LED lamp. The overall block diagram of the circuit is shown in Figure 1.
The main circuit part is followed by a filter after the mains supply. Its function is to filter out the higher harmonics in the power supply and the surge in the power supply, so that the control circuit is less interfered by the power supply. The input rectification part adopts an integrated rectifier bridge. The unidirectional conduction characteristic of the diode converts the alternating current whose level is floating up and down at zero to a unidirectional pulsating direct current, and then outputs a direct current voltage under the action of the filter capacitor and the inductor. After the adjustment and control of the MIP553 and BUCK circuits, the voltage for the LEDs is output.
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