The invention discloses an
ion generator, a refrigerator and a control method. The
ion generator comprises a
direct current power supply, the output end of which is connected with a first terminal of the primary side of a
transformer; a second terminal of the primary side of the
transformer is connected with the reference ground, a first terminal of the
secondary side is connected with the first end of the
filter capacitor, a second terminal is connected with the first end of the
filter capacitor, the first terminal of the
secondary side of the
transformer is connected with the
discharge electrode, and the
discharge electrode is arranged opposite to the neutral
electrode; the first detection module is used for detecting the input
voltage of the
discharge electrode; the input end of the variable frequency controller is connected with the first detection module, the output end of the variable frequency controller is connected with the switching tube, and the variable frequency controller is used for adjusting the switching period and / or duty ratio of the switching tube between the second terminal of the primary side of the transformer and the reference ground after the discharge electrode continuously operates for a period of time under the same input
voltage, so that the input
voltage of the discharge electrode is changed. According to the invention, the
ion generation amount and the ion
diffusion efficiency can be improved.