There are many types of DC power supply. Different types of dc power supply have different properties of non-static power and different energy conversion processes. In chemical cells (such as batteries, batteries, etc.), nonelectrostatic forces are related to ion dissolution and deposition processes, chemical energy is converted to electrical energy and joule heat when a chemical cell discharges, and nonelectrostatic forces are related to diffused temperature differences and electron concentration differences. When the power supply supplies power to the external circuit, the heat portion is converted to electricity. In a DC generator, the nonstatic force is the effect of electromagnetic induction. When powered by a DC generator, mechanical energy is converted into electrical energy and joule heat. In a photocell, the nonstatic force is a function of the photovoltaic effect. When powered by a photocell, the light energy is converted into electricity and joule heat.

 

Differences between DC power supply and AC power supply:

Alternating current (AC) cycle is changing, which means it every measurement is different, it is often used to implement the electronic coupling voltage change, so the transmission network is AC power, we used in the power of life is the alternating current (AC), but its disadvantages as well, such as in some other high-voltage dc network communication loss is higher than the high voltage direct current network, alternating current is not stable, Once a fault occurs, it will lead to the fault of the whole network, so some transmission projects use DC transmission. Ac cannot be converted but is easy to change voltage, dc is easy to convert but is not easy to change voltage.