Capacitor

An embodiment of the utility model discloses a capacitor capable of realizing zero switching so as to solve the problem that the conventional capacitor has no zero switching function. The capacitor comprises a switching switch, a switching signal/shutoff signal detector, and a zero switching controller connected with units respectively. When the switching signal/shutoff signal detector detects a switching signal, the zero switching controller is informed. The zero switching controller detects the power supply voltage of each phase, and computes the action time of the switching switch according to the power supply voltage so as to control the switching switch to be switched on at the moment of voltage zero passage; and similarly, when the switching signal/shutoff signal detector detects a shutoff signal, the zero switching controller is also informed. The zero switching controller detects the electric current of each phase, and computes the action time of the switching switch according to the electric current