The performance of the PWM function of cooling fans
PWM speed fan motor drive circuit has the following performance index
1, the output current and voltage range, it decides the circuit can drive more high power motor. The morning high quality cooling fan
2, efficiency, and high efficiency means not only saves electricity, also can reduce the heat drive circuit, to improve the efficiency of the circuit, can guarantee the working state of switching devices and prevent common mode conduction ( H bridge or push-pull circuit may be a problem, namely, two power device at the same time conduction power short circuit) 。
3, impact on the control input, the input circuit power should have good signal isolation, to prevent a high voltage, large current into the main control circuit, it can use the high input impedance or electric coupler isolation. Wenling city tong chi auto air conditioning manufacturing co. , LTD. , specializing in the production of cooling fans
4, the impact on the power supply, common mode conduction can cause power supply electric moment caused by the high frequency power pollution, large current may lead to ground potential.
5, the reliability, the motor drive circuit should be as much as possible, regardless of what kind of control signal, and what kind of power supply load circuit are safe