At present, the power adapters of our common routers are mostly AC output, and there is almost no DC output. So which one is more advantageous, AC or DC? The appearance of common AC power adapter (hereinafter referred to as AC power supply) is usually equipped with AC symbol, and DC power adapter (hereinafter referred to as DC power supply) is DC. The internal of AC adapter is mainly through the power transformer to complete the conversion output, and the internal of DC adapter is composed of rectifier circuit.
At present, the common AC power adapter on the router has a copper core (wire package). When working, the power consumption will be lost in the form of reactive work. The input voltage range of wire package power supply is very narrow and can not adapt to a variety of use environments. The common DC power supply is an adapter (such as mobile phone power adapter, also known as DC switching power supply), which is internally composed of rectifier IC chip and filter circuit, and the loss will be much lower.
DC switching power supply and AC wire package power supply with the same 9v500ma output specification. It can be seen that under no-load condition, the power loss of DC power supply is only 0.49w, while that of AC power supply reaches 1.59w. The difference between them is 1.59-0.49 = 1.1W. The no-load loss of AC power supply is 1.59 / 0.49 = 3.24 times that of DC power supply! Connected to the tested wireless router, we can see that this gap continues to expand. The overall power consumption of DC power supply and router is only 4.59w, while that of AC power supply connected to router is 6.06w. 6.06–4.59=1.47W。 Compared to 1.1W without load. Moreover, if the power consumption of the machine itself increases, this gap will continue to expand. It can be seen that under the same power, DC switching power supply has the advantages of small volume, light weight, low loss, high power density and so on. In particular, the switching power supply itself has the functions of wide input voltage, high voltage stabilization accuracy, overcurrent, overvoltage and short circuit protection. Because of the above advantages, most power adapter schemes of electronic products now use DC switching power output.
