Convertional AC-DC power supplies and DC-DC converters provide an output that is regulated to provide a "constant-voltage". However, LEDs work most efficiently and safest with a "constant-current" drive. Therefore, we develop many new devices to offer this kind of LED drive. In the past, AC-DC power supplies that provided a regulated "constant-voltage" to LEDs were referred to as LED power supplies. Nowadays, LED driver almost means to LED power supply. What you should remember is whether the output of the power device provides a "constant-voltage" or a "constant current" .

 

Most commercially available LED "light modules" are constructed by connecting a number of LEDs in series or parallel to form cluster or string configurations. In cases where these light modules include a "constant-current" driver as part of the assembly, an external "constant-voltage" driver or power supply is required. Low cost LED circuits control the current flowing through the LED with a simple resistor. This is another case where a constant-voltage power source is required. Other examples where"constant voltage" supplies have been employed include backlit ad signs, traffic information signs and large screen high definition LED displays.

 

Constant-voltage drivers come in many different forms. They can look like a conventional power supply or they can be enclosed for moisture and environmental protection.

 

Shenzhen YSD Technology Co.,Ltd focus on constant voltange LED power supply for 10 years. With authoritative certifications, the LED power driver is hot selling around the world. It is widely used for LED strip, LED guardrail tube, LED modules, LED point light source, LED luminous characters, LED lighting, LED display, light fixture and so on.