Dc power source apparatus
AssigneeMitsubishi Electric Corporation
InventorsShingo KATO, Matahiko IKEDA, Nobuhiro KIHARA
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Abstract
There is provided a DC power source apparatus that can prevent failures in components included in the DC power source apparatus and a load and that can prevent damage to or deterioration in the components. A control unit of the DC power source apparatus includes a function of limiting a duty value that is the ratio of an on-time to the switching period of a switching device, and makes an upper limit value for limiting the upper limit of the duty value variable during switching operation of the switching device.
Claims13
A DC power source apparatus that is connected between a power source and a load and that boosts the voltages of the power source and then supplies the boosted voltage to the load, the DC power source apparatus comprising:
- a reactor connected between an interconnection portion of a plurality of switching devices and the power source;
- a low-voltage-side smoothing capacitor that smoothes a low-voltage-side voltage to be applied to the reactor;
- a high-voltage-side smoothing capacitor that smoothes a high-voltage-side voltage to be supplied to the load;
- a low-voltage-side voltage sensor that detects the low-voltage-side voltage;
- a high-voltage-side voltage sensor that detects the high-voltage-side voltage;
- and
- a control unit that performs PWM-control of the plurality of switching devices in such a way that a high-voltage-side voltage detection value detected by the high-voltage-side voltage sensor keeps track of a high-voltage-side voltage target value,
- wherein the control unit includes a function of limiting a duty value that is the ratio of an on-time to a switching period of the switching device, and makes an upper limit value for limiting the upper limit of the duty value variable during switching operation of the switching device.
Dependencies are inferred from the claim text.