LED controller used control of led switch by ic chip.
1, low voltage led products, large power controller
In general the design voltage of low voltage products as 12V-36V, the quantity for each loop of 3-6 in series . LED current limiting with the current limiting resistors, each loop current below 20mA . A LED products has a lot LED loop to composing. Advantage is low voltage, construction is simply , easy to design ; the shortcoming is: the current large when product size big, low voltage switching power supply need install. due to the limit of products disadvantage. The Low voltage con’t long-distance transmission. are confined to a small volume products, such as: text of signboard , small text pattern. According to the features, specification of product design: 12V choice of 75A/30V MOS to control, output current as 8A/channel; 24-32V choice of 60A/50V MOS to control, output current as 5A/chanle; Users can select the channel quantity of led controller, according to the above specifications, Note that the LED must be a common positive(+) pole connecting method, controller is common negative(-)pole, controller is not include low voltage source.
2, Low voltage LED in series controller
multi- control channel is mainly feature for The low voltage led in series controller. Used the transmission of in series single to realized a purpose of control . in general, 512 unit just only need to control of four control lines, the in series LED controller need to configuration of register at light source board of LED .
3, High voltage LED controller
The high voltage led controller is alternating voltage(AC). Echo circuit loop has 36-48 in series of LED, and echo current of circuit loop is 20mA below. There are has two kinds of current limiting mode, one is the resistor limiting current. The resistance power consumption is large in this mode, suggestion that echo of four resistors are connected in series with a 1/4W metal mold resistor. Uniform distribution of heat, this mode is most stable and reliable in currently. Other mode is the capacitance connected in resistance to limiting current. A lot of voltage drop across the capacitor at the connecting method. Resistance power is small. But it just only runs in stable of supply power. The capacitor energy is storage when the supply power is unsteadiness.Thereby LED easily damaged. Any used the controller to control the led with resistance limiting current is necessarily. Echo loop of led has one meter, and power 5W,three-color per meter 15W.
finally: attention should be paid to load matching! The light distribution of neon and LED’s are not the same, the same circuit can not be mixed with different types of load.