Inverter apparatus

3:

• The inverter apparatus according to claim 2, wherein the switching control circuit is configured or programmed to control a voltage across the buffer capacitor, being charged, through PWM control of the switch device such that a voltage ripple of an output voltage of the active filter circuit is suppressed.

4:

• The inverter apparatus according to claim 2, wherein the rectifier device is a diode.

5:

• The inverter apparatus according to claim 2, wherein the rectifier device is a MOSFET or an insulated gate bipolar transistor, and the switching control circuit is configured to complementarily drive the rectifier device and the switch device.

6:

• The inverter apparatus according to claim 2, wherein the switch device is a MOSFET or an insulated gate bipolar transistor.

7:

• The inverter apparatus according to claim 2, wherein the rectifier device and the switch device are portions of a plurality of power switch devices housed in an intelligent power module.

8:

• The inverter apparatus according to claim 7, wherein the inverter circuit includes a bridge connection of four switch devices and the four switch devices are the power switch devices housed in the intelligent power module.

9:

• The inverter apparatus according to claim 2, further comprising an insulating DC-DC converter connected between the active filter circuit and the input power supply.

10:

• The inverter apparatus according to claim 2, wherein when the switch device is switched off and the rectifier device is switched on, a current flows through a closed loop including the inductor, the rectifier device, and the capacitor.

11:

• The inverter apparatus according to claim 2, wherein the inverter device is configured to generate positive half cycles and negative half cycles of an AC voltage and output the positive half cycles and negative half cycles.

12:

• The inverter apparatus according to claim 2, wherein the inverter circuit includes a first series circuit including first and second switch devices and a second series circuit including third and fourth switch devices, connected in parallel with each other.

13:

• The inverter apparatus according to claim 12, further comprising a control circuit configured to perform PWM control of the first, second, third and fourth switch devices.

14:

• The inverter apparatus according to claim 13, wherein the switching control circuit and the control circuit are configured to perform PWM control with different duty ratios in accordance with a phase angle of an output voltage.

15:

• The inverter apparatus according to claim 7, wherein the power switch devices housed in the intelligent power module include six insulated gate bipolar transistors.

16:

• The inverter apparatus according to claim 15, wherein four of the six insulated gate bipolar transistors define switch devices, a fifth of the six insulated gate bipolar transistors defines the rectifier device, and a sixth of the six insulated gate bipolar transistors defines the switch device connected between the second end of the inductor and a low-potential-side line.

17:

• The inverter apparatus according to claim 2, wherein the rectifier device includes a diode and switch devices defined by MOSFETs.

18:

• The inverter apparatus according to claim 2, further comprising a smoothing capacitor and an insulating DC-DC converter between an input of the smoothing capacitor and the input power supply.

19:

• The inverter apparatus according to claim 18, further comprising a full bridge circuit provided on a primary side of the insulating DC-DC converter.

20:

• The inverter apparatus according to claim 19, further comprising a resonant circuit including a capacitor and a primary winding of an insulating transformer connected to the full bridge circuit.

21:

• A power generation system comprising the inverter apparatus according to claim 2.