| 摘要 |
<p>An electronic controller using digital technology performs various functions in controlling the energy consumption of low power single-phase AC motors and providing protection and power conditioning to household appliances. It reduces energy consumption by automatically adjusting the voltage applied to the motor based on the poewr factor or phase angle between voltage and current. During low loads, motor efficiency is low and the phase angle is high so that the applied AC voltage is reduced, thereby saving on energy consumption. When the motor is fully loaded, the controller automatically applies full voltage. Furthermore, the digital controller also protects the load from over-voltage, under-voltage, overload, high starting currents, surges and transients. It also performs the functions of power-on delay, to prevent damage to the load when power interruption occurs and auto-volt operation, to allow operation over a wide range of voltages.</p> |
