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LED Drive
- Jul 19, 2018 -

There are three common LED drivers: constant current drive, RC drive, and linear constant current drive.


Constant current drive: Also called IC drive, constant current drive can output stable current under a certain input voltage.


The constant current drive has two kinds of isolation and non-isolation. The isolation drive has one more transformer. It can break the output current when the circuit is short-circuited. It is safer, but expensive, low efficiency (85%), and poor stability.


IC drive characteristics: IC drive belongs to buck type drive, that is, the output voltage and input voltage must have a voltage difference, that is, the total voltage of the lamp bead must not exceed the input voltage, otherwise it will stop working. The IC driver has two characteristics. One is to output a small current and a large voltage, which is smaller than the output high current and small voltage load. The second is that the low voltage input is higher than the high voltage input.


For many customers in the 110V voltage region, the lamp beads that can be used for 220V cannot work normally. Therefore, it is necessary to change the lamp bead to the parallel mode (usually two-way mode) to halve the voltage and double the current.


Compared with a single string circuit, the two-circuit circuit can reduce the circuit risk and make it easier to adjust the voltage range. However, at 110V, the IC itself is larger than 220V. If the circuit is connected in parallel, the current will be doubled, which will increase the IC load. Therefore, the 110V parallel IC is more expensive.