Review on 💡 BMOUO 12V 30A DC Universal Regulated Power Supply 360W – Ideal for CCTV, Radio, Computers, LED Strip Lights & More! by Rick Howlett

Good, build quality could be better. I decided to open one and photograph the inside. This power supply uses good old fashioned half-bridge topology with voltage doubler and passive secondary rectification, this unit doesn't even have a passive PFC so keep the ones in the EU in mind if the police ever break into your home. The xdLine filter consists of 2 Y capacitors and one X capacitor, there is no input varistor. The bridge rectifier is a GBU808, it has no heatsink which can be a problem when running at 120V. The primary transistors are a pair of D13009K, the manufacturer is unknown to me. Secondary diode pair 30100 (Should mean 30A 100V), also from unknown manufacturer. I hope someone knows. The primary capacitors are two 250V 680uF capacitors. The secondary has three 25V 3300uF capacitors. The controller chip is UTC494. The quality of the solder is decent, there are multiple cold soldering points. The metal rod acts as a heatsink, there is an insulating layer between the case and the metal rod, there is thermal grease between the transistors/diodes and the insulating layer, and there is no thermal grease between the insulating layer and the metal rod. A fan with a nominal voltage of 14 V is connected in series with a normally open switch KSD9700 (thermal switch), when the temperature reaches 45 °C, the switch closes and turns on the fan. The fan is powered by an auxiliary winding in the transformer. Well, when the switch is closed and the power supply is not loaded, the fan runs at 7V, when the power supply is loaded, the duty cycle in the primary winding increases, which in turn also increases the auxiliary winding voltage to 13V at a load of 150W. Personally I would short the thermal switch wires to keep the fan running all the time as it's still pretty quiet at light loads. The efficiency of the power supply is about 60% (terrible even for a half-bridge power supply). Edit: The efficiency is actually 79.6% (and reaches 80% at 240V) and the power factor is 0.63 at 120V and 0.54 at 240V.