| 摘要 |
An alternating current (AC) and direct current (DC) mixed air compressor controller. A control circuit in the controller successively comprises: an input circuit switching a power supply mode between direct current (DC) power supply and alternating current (AC) power supply via a changeover switch; a rectification circuit comprising a rectification bridge composed of four diodes and a capacitor connected in parallel with the rectification bridge; and a control circuit comprising a control centre and a power switch, wherein the control centre detects a capacitor voltage and sends a pulse width modulation (PWM) signal to control a duty ratio, and then provides operation power for an electrical motor via the power switch. By means of the controller, alternating current (AC) and direct current (DC) input power sources can be switched as desired, and the circuit is easy to implement. |
