US 5,675,238 AGranted

Power supply system

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorYoshihito Asao

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Abstract

A power supply system equipped with a power generating unit including an alternating-current generator and a rectifier for rectifying the generated output of the alternating-current generator. In addition, a switching relay is provided between a low-voltage load and a high-voltage load for selectively supplying the generated output from the power generating unit to one of the low-voltage load and high-voltage load. A field current control unit controls a field current flowing into a field winding of an AC generator and a high-voltage load control unit controls a switching operation of the switching relay and further controls the field current control unit in accordance with a state of the high-voltage load. The high-voltage load control unit operates the power generating unit through the field current control unit in switching between the low-voltage load and the high-voltage load so that the generated output is applied to the switching relay, thus removing oxide films on a surface of the switching relay to ensure the conductivity in the switching relay.

Claims19

Dependent claims

A power supply system comprising:

a power generating unit including an alternating-current generator for generating an alternating-current output, and a rectifier connected with said alternating-current generator for rectifying said generated output of said alternating-current generator;
switching means provided between a low-voltage load and a high-voltage load for selectively supplying said generated output from said power generating unit via a first terminal to one of said low-voltage load via a second terminal and said high-voltage load via a third terminal;
first control means connected to a field winding of said alternating-current generator for controlling a field current flowing into said field winding;
detection means for detecting a state of said high-voltage load;
and
second control means connected with said switching means, said first control means and said detection means for controlling a switching operation of said switching means and further for controlling said first control means in accordance with the state of said high-voltage load, said second control means operating said power generating unit through said first control means in switching between said low-voltage load and said high-voltage load so that the generated output is applied to said switching means, thereby generating an arc between said first terminal and one of said second and third terminals.

3 more elements

A power supply system comprising:

a power generating unit including an alternating-current generator for generating an alternating-current output, and a rectifier connected with said alternating-current generator for rectifying said generated output of said alternating-current generator, wherein said alternating-current generator includes a field winding;
a switching unit, provided between a low-voltage load and a high-voltage load and having first through third terminals, for selectively supplying said generated output from said power generating unit via the first terminal to one of said low-voltage load via the second terminal and said high-voltage load via the third terminal;
a first control unit connected to the field winding of said alternating-current generator for controlling a field current flowing into said field winding;
a detector for detecting a state of said high-voltage load and outputting a high-voltage load detection signal based on the detected state;
and
a second control unit connected to said switching unit, said first control unit and said detector, wherein in response to said high-voltage load detection signal said second control unit controls said first control unit to operate said power generating unit to generate a power output so that the generated power output is applied to said switching unit and controls a switching operation of said switching unit to switch the generated power output applied to said switching unit between said low-voltage load and said high-voltage load, thereby generating an arc between said first terminal and one of said second and third terminals.

3 more elements

Dependencies are inferred from the claim text.