Patent ID: 9621098
Date: 2017-04-11
CPC Classifications: B60L,E02F,H02P,Y02T

Claim:
1. A voltage control device comprising: a capacitor configured to supply power to a rotating electrical machine; an inverter connected to the rotating electrical machine; a transformer coupled booster including: two voltage source inverters of which direct current terminals are connected in series to have additive polarity; and a transformer configured to couple alternate current terminals of the two voltage source inverters, the transformer having a predetermined leak inductance, wherein one of the two voltage source inverters is connected to the capacitor in parallel, and the transformer coupled booster outputs, to the inverter, a direct-current voltage which is a raised capacitor voltage of the capacitor; and a controller configured to generate and output an instruction value of the direct-current voltage which is variable corresponding to the capacitor voltage within a predetermined range, in a range less than a predetermined upper limit voltage of the direct-current voltage and not less than a predetermined lower limit voltage of the direct-current voltage at a time the rotating electrical machine is in a drive state and the output of the transformer coupled booster is less than a predetermined output which is less than an output limit of the transformer coupled booster.