Electric power converter circuit
View Patent ↗An electric power converter circuit includes a rectifying circuit having diodes, a coil, and a full-bridge circuit including switching devices, which are connected in cascade to an AC power supply 1 , to convert an AC to a DC and to further convert the concerted DC to an AC. The converter circuit further includes a series circuit having a capacitor and a switching device, and connected between the DC terminals of the full-bridge circuit. One of the switching devices on the upper arm and one of the switching devices on the lower arm are turned simultaneously ON for a certain period of time. The electric power converter circuit facilitates reducing the number of the constituent parts, size, weight and manufacturing costs thereof.
1. An electric power converter circuit, comprising:
a rectifying circuit including diodes, a coil, and a full-bridge circuit including switching devices; the rectifying circuit, the coil, and the full-bridge circuit being connected in cascade to an AC power supply; the electric power converter circuit converting an AC electric power to a DC electric power and further converting the converted DC electric power to an AC electric power, and
a series circuit consisting of a capacitor and another switching device, the series circuit being connected between DC output terminals of the full-bridge circuit,
wherein a first switching device on an upper arm of the full-bridge circuit and a second switching device on a lower arm of the full-bridge circuit are made to be simultaneously ON for a first period of time, and the first switching device is coupled in series with the second switching device.
2. The electric power converter circuit according to claim 1 , wherein one of the switching devices constituting the full-bridge circuit is replaced by a diode.
3. The electric power converter circuit according to claim 1 , wherein one of the switching devices on the upper arm in the full-bridge circuit, one of the switching devices on the lower arm in the full-bridge circuit, and the switching device in the series circuit are simultaneously ON for a second period of time.
4. The electric power converter circuit according to claim 1 , wherein the coil is only disposed between the rectifying circuit and the full-bridge circuit.
5. The electric power converter circuit according to claim 1 , wherein the switching devices of the full bridge circuit are turned OFF simultaneously for a third period of time after the first period of time.
6. The electric power converter circuit according to claim 5 , wherein the capacitor is an electrolytic capacitor.
7. The electric power converter circuit according to claim 1 , wherein the rectifying circuit and the full-bridge circuit are arranged without having a main switch for increasing a current flow on the coil coupled in parallel therewith.
8. An electric power converter circuit, comprising:
a rectifying circuit including diodes, a coil, and a full-bridge circuit including switching devices; the rectifying circuit, the coil, and the full-bridge circuit being connected in cascade to an AC power supply; the electric power converter circuit converting an AC electric power to a DC electric power and further converting the converted DC electric power to an AC electric power, and
a series circuit consisting of a capacitor and another switching device, the series circuit being connected between DC output terminals of the full-bridge circuit,
wherein a plurality of the switching devices on an upper arm of the full-bridge circuit and a plurality of the switching devices on a lower arm of the full-bridge circuit are made to be simultaneously ON for a first period of time in order to increase a current on the coil, and at least one of the plurality of the switching devices on the upper arm is coupled in series with at least one of the plurality of the switching devices on the lower arm.
9. The electric power converter circuit according to claim 8 , wherein the switching devices of the full bridge circuit are turned OFF simultaneously for a third period of time after the first period of time.
10. The electric power converter circuit according to claim 9 , wherein the capacitor is an electrolytic capacitor.
11. The electric power converter circuit according to claim 8 , wherein the coil is only disposed between the rectifying circuit and the full-bridge circuit.
12. The electric power converter circuit according to claim 8 , wherein the rectifying circuit and the full-bridge circuit are arranged without having a main switch for increasing a current flow on the coil coupled in parallel therewith.