LED power supply is the power converter that converts the power supply into a specific voltage and current to drive the LED light. There are many types of LED power supplies, the quality and performance of various types of power supplies are very different, which is one of the important reasons affecting the price difference of LED power supplies. LED power supplies can usually be divided into three main categories, one is the switching power supply, the second is the linear IC power supply, and the third is the resistive buck power supply.
Resistive buck power supply uses a capacitor to provide drive current by its charge.Circuit is simple, cost is low, but poor performance and poor stability in the grid voltage fluctuations are easy to burn LED, while the output high voltage non-isolated requires insulation protective shell. Low power factor and short life of the power supply is generally only suitable for economic small power products. High power products with high output current, the capacitor can not provide high current, otherwise it is easy to burn out.
Linear IC power supply uses one IC or more ICs to distribute the voltage with less types of electronic components, high power factor and very high power supply efficiency, and no electrolytic capacitors. It has long life and low cost. The disadvantage is that the output high voltage is not isolated, there is a strobe, touching the power supply is easy to cause electric shock, so it requires the shell to do a good job to prevent electric shock isolation protection.
Switching power supply uses isolation transformer to change high voltage to low voltage and rectification and filtering to provide stable output DC power. Switching power supply is relatively high safety (generally output low voltage), stable performance, mature technology, is the mainstream of the current LED lighting program. The disadvantage is that the circuit is complex, the price is higher
LED power supply from the input and output insulation characteristics can be divided into isolated power supply and non-isolated power supply. The safety of non-isolated power supply is slightly worse, the input and output are not insulated, but the cost is also relatively low, the traditional energy-saving lamps is the use of non-isolated power supply, using insulated plastic shell protection. The isolated power supply is electrically isolated between the input and output, which is very high safety. When the human body touches the output part of the power supply will not be electrocuted, so the shell insulation requirements are not high, but there will be an increase in cost. In the middle and high-end market, switching isolated power supply is the mainstream power supply solution in the market.
According to the requirements of of LED power supply's characteristics , the selection and design of LED power supply should focus on the reliability, efficiency, power factor and other requirements.
The reliability of LED power supply is high, the lamp life will be long, especially like LED street light power supply, which installed high altitude in the outdoor , if the LED power supply failure will increase the cost of maintenance of LED lights. LED power supply in the design phase of rigorous verification testing and late material quality control is an indispensable guarantee of high reliability.
LED is an energy-saving product, the higher efficiency, the more energy-efficient.LED luminous efficiency decreases as the temperature of the LED rises, so the heat dissipation of the LED is very important. The LED power supply has high efficiency, its power dissipation is small, the heat generated within the lamp is small, it also reduces the temperature rise of the lamp, more beneficial to delay the light decay of LED. By optimizing the design and choosing smaller components, it is possible to use smaller case sizes, making the power supply slim and reducing costs.
Power factor is a requirement of the power grid for the load. Although a low power factor of a single appliance with little power has little effect on the grid. But we turn on the lights at night, the same kind of load is too concentrated, will produce very serious pollution of the grid, so the high power factor LED power supply will greatly reduce the pollution of the grid. The European Union has issued standards requiring power supply equipment with power greater than 25W to have power factor correction lines.
The LED power supply manufactured by Yanshuoda use an enhanced PFC controller based on an innovative Valley Count Frequency Fold-back, or VCFF method for lighting applications to provide higher efficiency and reliability, and optimized total harmonic distortion performance technology to provide best THD performance over a wide load range.
A large number of deliveries and customer praise has proved the long-term stability of the LED power supply. The YSD LED power supply adopts ultra-thin housing design, the LED power supply is small and beautiful,with a superb appearance and excellent electrical performance.