AC-DC dual-purpose photovoltaic device

The invention provides an AC-DC dual-purpose photovoltaic device comprising: a PV assembly, a DC-side capacitor, a DC-PWM power switch circuit and a controller. The DC-side capacitor is connected in parallel with the output end of the PV assembly. The input end of the DC-PWM power switch circuit is connected to the output end of the PV assembly. The DC-PWM power switch circuit includes a controllable switch tube. The controller is used for outputting a switch control signal to control the switch state of the controllable switch tube in the DC-PWM power switch circuit in order that the DC-PWM power switch circuit outputs DC PWM waves or AC PWM waves. When the switch control signal is a DC modulation signal, the DC-PWM power switch circuit outputs the DC PWM waves. When the switch control signal is an AC modulation signal, the DC-PWM power switch circuit outputs the AC PWM waves. The AC-DC dual-purpose photovoltaic device can be applied to cases where DC power supply is required and cases where AC power supply is required so as to be improved in universality.