DC power supply system and control method
First Claim
1. A DC power supply system comprising:
- a rectifier that converts AC power from an AC source into DC power and supplies the DC power to a load through a feeder;
a semiconductor device that connects a storage battery and the feeder to each other and is turned on when a current is supplied from a storage battery side toward a load side;
a charger that is in parallel with the rectifier, (a) converts the AC power into DC power, (b) charges the storage battery with a charging current of DC, and (c) is controllable to supply an assist current of DC to the load through the semiconductor device; and
a controller that;
(a) controls an output current of the charger so that the charging current supplied from the charger to the storage battery is kept at a predetermined value when the charger operates at a potential of an output voltage smaller than a potential of an output voltage of the rectifier during charging of the storage battery, and(b) controls the output current of the charger so that the charger outputs the assist current supplied toward the load while the charging current is kept at the predetermined value when the load requires a current larger than the current supplied by the rectifier during charging of the storage battery, the potential of the output voltage of the rectifier is reduced smaller than the potential of the output voltage of the charger by a current drooping operation, and the semiconductor device is turned on.
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Accused Products
Abstract
A DC power supply system and a control method, which can continue charging of a storage battery with a constant current even if an assist current is needed due to, for example, overload during charging of the storage battery and can suppress a current output from the storage battery as much as possible. In a power supply system, when a charger operates at a potential of an output voltage smaller than the potential of the output voltage of a rectifier during charging of the storage battery, the output current of the charger is controlled so that a charging current Ie supplied from the charger to the storage battery is kept at a predetermined value, and when a load requires a current larger than the current supplied by the rectifier during charging of the storage battery, the potential of the output voltage of the rectifier is reduced smaller than the potential of the output voltage of the charger by a current drooping operation, and the diode is electrically connected, the output current of the charger is controlled so that the charger outputs the assistant current Ic supplied toward the load while the charging current Ie is kept at a predetermined value.
17 Citations
10 Claims
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1. A DC power supply system comprising:
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a rectifier that converts AC power from an AC source into DC power and supplies the DC power to a load through a feeder; a semiconductor device that connects a storage battery and the feeder to each other and is turned on when a current is supplied from a storage battery side toward a load side; a charger that is in parallel with the rectifier, (a) converts the AC power into DC power, (b) charges the storage battery with a charging current of DC, and (c) is controllable to supply an assist current of DC to the load through the semiconductor device; and a controller that; (a) controls an output current of the charger so that the charging current supplied from the charger to the storage battery is kept at a predetermined value when the charger operates at a potential of an output voltage smaller than a potential of an output voltage of the rectifier during charging of the storage battery, and (b) controls the output current of the charger so that the charger outputs the assist current supplied toward the load while the charging current is kept at the predetermined value when the load requires a current larger than the current supplied by the rectifier during charging of the storage battery, the potential of the output voltage of the rectifier is reduced smaller than the potential of the output voltage of the charger by a current drooping operation, and the semiconductor device is turned on. - View Dependent Claims (2, 3, 4, 5)
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6. A control method for a DC power supply system including:
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a rectifier that converts AC power from an AC source into DC power and supplies the DC power to a load through a feeder; a semiconductor device that connects a storage battery and the feeder to each other and is turned on when a current is supplied from a storage battery side toward a load side; and a charger that is in parallel with the rectifier, (a) converts the AC power into DC power, (b) charges the storage battery with a charging current of DC, and (c) is controllable to supply an assist current of DC to the load through the semiconductor device; wherein the control method comprises; (a) controlling an output current of the charger so that the charging current supplied from the charger to the storage battery is kept at a predetermined value when the charger operates at a potential of an output voltage smaller than a potential of an output voltage of the rectifier during charging of the storage battery; and (b) controlling the output current of the charger so that the charger outputs the assist current supplied toward the load while the charging current is kept at the predetermined value when the load requires a current larger than the current supplied by the rectifier during charging of the storage battery, the potential of the output voltage of the rectifier is reduced smaller than the potential of the output voltage of the charger by a current drooping operation, and the semiconductor device is turned on. - View Dependent Claims (7, 8, 9, 10)
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Specification