METHOD OF CONTROLLING HYBRID DC POWER SUPPLY SYSTEM
First Claim
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1. A method of controlling a hybrid DC power supply system including a first DC power supply device for generating a first output voltage and delivering a first source current or receiving a first sink current;
- a second DC power supply device connected to a load, for delivering a second source current which increases as a second output voltage generated thereby decreases and which decreases as the second output voltage increases; and
a voltage increasing/reducing DC/DC converter connected between the first DC power supply device and a junction between the load and the second DC power supply device, for controlling the second output voltage by increasing or reducing duty ratios for driving switching devices thereof, the method comprising the steps of;
controlling the hybrid DC power supply system such that a load sink current demanded by the load is the sum of a current converted from the first source current by the DC/DC converter and the second source current; and
controlling the second output voltage of the second DC power supply device such that a value of a current flowing from an output point of the first DC power supply device through the DC/DC converter to the junction does not exceed a predetermined threshold value.
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Abstract
A fuel cell vehicle has a motor driven by an inverter and hybrid DC power supplies including a battery and a fuel cell for supplying electric power to the motor. For preventing a fuse connected to the battery from being blown out, when a motor current Im increases, a first source current flowing from the battery is limited to a range for not blowing out the fuse, and a generated current is increased as much as the first source current is limited.
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Citations
21 Claims
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1. A method of controlling a hybrid DC power supply system including a first DC power supply device for generating a first output voltage and delivering a first source current or receiving a first sink current;
- a second DC power supply device connected to a load, for delivering a second source current which increases as a second output voltage generated thereby decreases and which decreases as the second output voltage increases; and
a voltage increasing/reducing DC/DC converter connected between the first DC power supply device and a junction between the load and the second DC power supply device, for controlling the second output voltage by increasing or reducing duty ratios for driving switching devices thereof, the method comprising the steps of;controlling the hybrid DC power supply system such that a load sink current demanded by the load is the sum of a current converted from the first source current by the DC/DC converter and the second source current; and controlling the second output voltage of the second DC power supply device such that a value of a current flowing from an output point of the first DC power supply device through the DC/DC converter to the junction does not exceed a predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a second DC power supply device connected to a load, for delivering a second source current which increases as a second output voltage generated thereby decreases and which decreases as the second output voltage increases; and
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9. A method of controlling a hybrid DC power supply system including a first DC power supply device for generating a first output voltage and delivering a first source current or receiving a first sink current;
- a second DC power supply device connected to a load, for delivering a second source current which increases as a second output voltage generated thereby decreases and which decreases as the second output voltage increases; and
a voltage increasing/reducing DC/DC converter connected between the first DC power supply device and a junction between the load and the second DC power supply device, for controlling the second output voltage by increasing or reducing duty ratios for driving switching devices thereof, the method comprising the steps of;controlling the hybrid DC power supply system such that the first sink current flows from the DC/DC converter into the first DC power supply device; and controlling the second output voltage of the second DC power supply device such that a value of a current flowing from the junction through the DC/DC converter to an input point of the first DC power supply device does not exceed a predetermined threshold value. - View Dependent Claims (10, 11, 12, 13, 14)
- a second DC power supply device connected to a load, for delivering a second source current which increases as a second output voltage generated thereby decreases and which decreases as the second output voltage increases; and
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15. A method of controlling a hybrid DC power supply system including a first DC power supply device, a second DC power supply device connected to a load, and a chopper DC/DC converter connected between the first DC power supply device and a junction between the load and the second DC power supply device, the method comprising the steps of:
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(a) increasing or reducing duty ratios for driving switching devices of the DC/DC converter depending on a value of a current flowing from an output point of the first DC power supply device through the DC/DC converter to the junction; (b) increasing or reducing a second output voltage of the second DC power supply device when the duty ratios are increased or reduced; (c) increasing a second source current flowing from the second DC power supply device when the second output voltage of the second DC power supply device is reduced, and reducing the second source current flowing from the second DC power supply device when the second output voltage of the second DC power supply device is increased; and (d) increasing or reducing the second source current such that the value of the current flowing from the output point of the first DC power supply device through the DC/DC converter to the junction does not exceed a predetermined threshold value. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification