Knowledge of LED power supply

1、 Efficiency of LED power supply

LED power supply is a kind of equipment that converts AC current into DC power supply, and converts 380V or 110V into the necessary working voltage of LED lamps. Also called power transformer, transformer, fire cow, etc. The operating voltage of each LED smled lamp bead is generally about 2.8V to 3.4V. The LED lamp beads are connected in series and parallel to form a power circuit. According to the necessity of the power circuit, we choose how to match the appropriate switching power supply. For the cob LED lamp bead, the general operating standard voltage is dc36-dc42v. Many integrated ICs are connected in series and parallel on a base steel plate, The switching power supply must show the appropriate operating voltage and current to ensure that the lamp source is in operation

2、 Common parameters of LED power supply.

Input voltage: 220V to 240V according to the country, China, Europe, Australia and other countries, so we generally use the narrow voltage ac200-240v, and AC 100-110 V in the United States, Canada, Japan and South Korea.

Output voltage: generally determined according to the lamp beads in series, about 32-37v.

Output current (constant voltage): determined according to parallel connection of lamp beads: 250mA, 300mA, 350mA, 500mA, 600mA, 700mA, 800mA, 900mA, 1050mA, 1200Ma, etc.

1. power factor of power supply:

Power factor is an important technical data of power system. Power factor is a factor to measure the efficiency of electrical equipment. Low power factor indicates that the useless power of the circuit used for alternating magnetic field conversion is large,

Thus, the utilization rate of machinery and equipment is reduced, and the damage of line power supply system is increased.

Pf indicates that pf>0.9 or pf>0.95 in general

2. switching power efficiency:

The power consumed by the LED bulb divided by the percentage of the total lamp power,

The higher the efficiency, the less electric energy is wasted and the more electric energy is converted into light energy.

3、 Key components of LED power supply

Capacitance: determines the service life of the power supply

Ic: determines the stability of the whole power supply and the cross current accuracy of the current.

Metal oxide semiconductor: stable voltage

Transformer: step down from 220 V or 110 V to the voltage required by the lamp bead.

It is widely used for indoor lighting, such as track spotlight, ceiling lamp, track spotlight, patch ceiling lamp, cob ceiling lamp, and outdoor lighting engineering commodity lighting equipment, such as projection lamp, court lamp, and buried lamp.