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US 7,450,401 B2Granted
Bidirectional DC/AC inverter
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorTakahide Iida
Life of this patent
Estimating the term…
Abstract
An input voltage Vc to a bridge circuit is made variable by making a switching element, which is on a lower side among a plurality of switching elements constituting the bridge circuit, a coil and a capacitor, which constitute a filter, operate as an active filters at the time of charging the battery.
Claims10
A bidirectional DC/AC inverter, comprising:
- a first power conversion unit;
- a second power conversion unit;
- a third power conversion unit;
- and
- a control unit for controlling respective operations of the first through third power conversion units,
- wherein the first power conversion unit converts an inputted AC power into a DC power, and the second power conversion unit converts the immediately aforementioned DC power into an AC power, and the third power conversion unit converts the immediately aforementioned AC power into a DC power thereby supplying the DC power to a battery at the time of charging said battery,
- the third power conversion unit converts a DC power obtained from the battery into an AC power, and the second power conversion unit converts the immediately aforementioned AC power into a DC power, and the first power conversion unit converts the immediately aforementioned DC power into an AC power thereby outputting the AC power from the aforementioned bi-directional DC/AC inverter, and
- the control unit makes a switching element, a capacitor, which constitute the first power conversion unit, and a coil, which constitutes a filter which is connected to the first power conversion unit, operate as an active filter at least during a period of time in which a terminal voltage of the battery is equal to or greater than a predetermined voltage, thereby making an input voltage to the second power conversion unit adjustable at the time of charging the battery.
5 more elements
A bidirectional DC/AC inverter, comprising:
- a filter comprising a coil;
- a first bridge circuit, being constituted by plural switching elements, each of which is connected to a diode in parallel, and connected to the filter;
- a second bridge circuit, being constituted by plural switching elements, each of which is connected to a diode in parallel, and connected to the first bridge circuit;
- a capacitor, being installed between the first and second bridge circuits;
- a third bridge circuit, being constituted by plural switching elements, each of which is connected to a diode in parallel, and connected to the second bridge circuit by way of a transformer;
- and
- a control circuit for making the second bridge circuit function as converting a DC power into an AC power, and the first and third bridge circuits respectively function as converting an AC power into a DC power at the time of charging a battery, and for making the first and third bridge circuits respectively function as converting a DC power into an AC power, and the second bridge circuit function as converting an AC power into a DC power at the time of outputting an AC power from the aforementioned bidirectional DC/AC inverter,
- wherein the control circuit makes a predetermined switching element among individual switching elements, which constitute the first bridge circuit, the coil and the capacitor operate as an active filter at least during a period of time in which a terminal voltage of the battery is equal to or greater than a predetermined voltage, thereby making an input voltage to the second bridge circuit adjustable, at the time of charging the battery.
5 more elements
A drive control method for a bidirectional DC/AC inverter which comprises:
- a first power conversion unit;
- a second power conversion unit;
- a third power conversion unit;
- and
- a control unit for controlling respective operations of the first through third power conversion units,
- wherein the first power conversion unit converts an inputted AC power into a DC power, and the second power conversion unit converts the immediately aforementioned DC power into an AC power, and the third power conversion unit converts the immediately aforementioned AC power into a DC power thereby supplying the DC power to a battery at the time of charging said battery,
- the third power conversion unit converts a DC power obtained from the battery into an AC power, and the second power conversion unit converts the immediately aforementioned AC power into a DC power, and the first power conversion unit converts the immediately aforementioned DC power into an AC power thereby outputting the AC power from the aforementioned hi-directional DC/AC inverter, comprising:
- making a switching element, a capacitor, which constitute the first power conversion unit, and a coil, which constitutes a filter which is connected to the first power conversion unit, operate as an active filter at least during a period of time in which a terminal voltage of the battery is equal to or greater than a predetermined voltage, thereby making an input voltage to the second power conversion unit adjustable at the time of charging the battery.
5 more elements
Dependencies are inferred from the claim text.