Power conversion device
AssigneeFuji Electric Co., Ltd.
InventorSatoru FUJITA
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Abstract
Aspects of the invention include a step-up/step-down chopper unit, an inverter unit, a rectifier unit, first to third voltage detection means, and a drive control unit. Voltage regulation means of the drive control unit, in accordance with a detected voltage value detected by the voltage detection means, generates control signals for keeping the effective voltage value of a capacitor constant. In some aspects of the invention, the effective voltage value of the capacitor is controlled to be constant by the switching elements of the step-up/step-down chopper unit and inverter unit being driven by the control signals. The rectifier unit can suppress a surge voltage by causing energy stored in a inductor to be absorbed by storage elements when bidirectional switching elements are turned off.
Claims21
A power conversion device, comprising:
- a first series circuit wherein a first inductor and a first bidirectional switching element are connected in series;
- a second series circuit, connected in parallel to the first bidirectional switching element, wherein a second bidirectional switching element and a capacitor are connected in series;
- a serial switching element wherein 2N (N being a positive integer) switching elements, in each of which a diode is connected in anti-parallel, are connected in series;
- a serial storage element, connected in parallel to the serial switching element, wherein first and second storage elements are connected in series;
- a first serial rectifier element, connected in parallel to the serial storage element, wherein first and second rectifier elements are connected in series;
- and
- a second inductor connected from an intermediate point of the 2N switching elements to a connection point of the second bidirectional switching element and capacitor, wherein
- a connection point of the first and second storage elements is connected to a connection point of the first bidirectional switching element and the capacitor,
- a connection point of the first and second rectifier elements is connected to a connection point of the first bidirectional switching element and second bidirectional switching element, and
- alternating current applied to the first series circuit is converted, and output from both ends of the capacitor.
Dependencies are inferred from the claim text.