Car electrical appliances with DC or AC, why?
With the DC, the car's generator is the DC generator.
The power generated by the car is AC rectified by the direct current, in the DC regulator to 13.5V DC to the battery charge, so regardless of the generator turn fast, the voltage regulator will not exceed 13.5V,
Car equipment can only work through the DC, AC can not let the car running up, because the car inside the equipment most of the equipment inside the circuit board, some components, such as transistors and the vast majority of integrated chips are DC power supply , They must have their own static working state, that is, DC working state, most of the transistor in the DC environment to play its function. Electronic circuits used in the integrated amplifier circuit, operational amplifiers, logic circuits and many other circuits have to use the transistor this electronic components. The transistor in the circuit there are two operating points is very important, one is a static operating point, one is the dynamic point of work. While the static operating point can affect the dynamic operating point and can directly affect the performance of integrated circuits. Amplify the signal is distorted ah like. So the static operating point of the set is very important, and the static operating point is working in the DC state, so the circuit board power supply is used in DC.
