Power converting device
AssigneeMitsubishi Electric Corporation
InventorMitsuru Ishizuka
Life of this patent
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Abstract
In order to reduce the number of current detectors detecting phase current in a power converting device that controls a power converter connected to a motor, thereby achieving a size reduction, the power converting device includes a current detector that detects, of winding groups of multi-phase windings, a total value of values of current flowing into a first switching element connected to a first phase of a first winding group and a second switching element connected to a second phase of a second winding group, and calculates a current value of another phase from current detected by the current detector.
Claims12
A power converting device, comprising:
- a power converter configured to supply power to a plurality of multi-phase windings of a motor using a plurality of bridge-connected switching elements including at least a first switching element and a second switching element, wherein the power converter includes a plurality of current detectors including at least a first current detector;
- and
- a power converter controller configured to generate a PWM signal that controls the power converter and a plurality of winding groups including at least a first winding group and a second winding group,
- wherein the first current detector is connected to a first switching element connected to a first phase of the first winding group and a second switching element connected to a second phase of the second winding group, and the first current detector is configured to detect total value of a first value of current flowing into the first switching element and a second value of current flowing into the second switching element, and
- wherein the power converter controller is configured to control the first winding group using a first carrier signal, control the second winding group using a second carrier signal, and carry out current detection when an on/off state of the first switching element connected to the first current detector differs from an on/off state of the second switching element connected to the first current detector by causing a phase of the first carrier signal and a phase of the second carrier signal to deviate within a phase range, and wherein the power converter controller generates the PWM signal in accordance with current detected by the first current detector.
Dependencies are inferred from the claim text.