Cosel is one of the world's leading power supply manufacturers offering
high-quality, ultra small size AC-DC power supplies,
DC-DC converters of the state-of-the-art technologies, and effective and
easy-to-use noise filters.

1. The operation in DC input voltage
 In input circuit of switch mode power supply, basically once AC input voltage is rectified and is converted to DC voltage. Therefore, power supply could be operated with DC voltage. However power supply which has input voltage selector is not allowed to be operated with DC voltage.

 Since the rectified voltage is smoothed by capacitor, it is required to apply DC voltage in which value is equal to the crest value of AC voltage. Therefore, when the power supply is operated with DC voltage, the rated AC voltage times the square root of two (= AC voltage x √2) needs to be applied. Please refer to the DC input voltage range in COSEL catalog.

2. The wiring for DC input