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12V power supply is one of the most common power supplies in use at present. In general, a 12VDC output is obtained from a 100VAC-277VAC input using a combination of transformers,12V power supplies can be of two types: 12V constant power supplies, and 12V unconstant power supplies. 12V constant power supplies come in three styles: Switching constant AC to DC, Linear constant AC to DC, and Switching constant DC to DC.
12Vdc led drivers is to maintain a Constant Voltage during working regardless of the current variations. A CV LED driver is suitable for Parallel circuit LED lighting because they have an in built resistor to control the current, therefore a CV driver would be required to convert the AC power to the required DC voltage.
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