POWER SOURCE SWITCH DEVICE AND POWER SOURCE SYSTEM PROVIDED WITH SAME
First Claim
1. A power switching device for switching an electric circuit connecting a DC power supply and a capacitance element in response to a command from an external source, the power switching device comprising:
- one or more semiconductor elements, inserted along the electric circuit, each allowing current to flow at or below a maximum current determined according to a level of an input control signal, the current corresponding to a difference between a voltage of the DC power supply and a charging voltage of the capacitance element;
a controller outputting a control signal individually to each of the one or more semiconductor elements; and
a temperature detection circuit detecting a temperature of the one or more semiconductor elements, whereinuntil a predetermined time period elapses after receipt of a command to place the electric circuit into a closed state, the controller adjusts the level of each control signal in accordance with the temperature detected by the temperature detection circuit so that current flowing through the electric circuit does not exceed a current limit, andafter the predetermined time period elapses, the controller adjusts the level of each control signal so that the current flowing through the electric circuit is allowed to exceed the current limit.
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Accused Products
Abstract
Provided are semiconductor elements 107A, 107B, and 107C that allow a current to flow that is at most a maximum current determined by the level of control signals VGA, VGB, and VGC and that depends on the difference between the voltage of a DC power supply BA and the charging voltage of a capacitor 102, a controller 105 that outputs a control signal to each semiconductor element, and a temperature detection circuit that detects the temperature of each semiconductor element. Until a predetermined time elapses after the electric circuit is closed, the controller 105 adjusts the level of each control signal based on the temperature detected by the temperature detection circuit so that current through the electric circuit does not exceed a current limit, and after the predetermined time period elapses, the controller 105 adjusts the level of each control signal so that current through the electric circuit is allowed to exceed the current limit.
13 Citations
21 Claims
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1. A power switching device for switching an electric circuit connecting a DC power supply and a capacitance element in response to a command from an external source, the power switching device comprising:
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one or more semiconductor elements, inserted along the electric circuit, each allowing current to flow at or below a maximum current determined according to a level of an input control signal, the current corresponding to a difference between a voltage of the DC power supply and a charging voltage of the capacitance element; a controller outputting a control signal individually to each of the one or more semiconductor elements; and a temperature detection circuit detecting a temperature of the one or more semiconductor elements, wherein until a predetermined time period elapses after receipt of a command to place the electric circuit into a closed state, the controller adjusts the level of each control signal in accordance with the temperature detected by the temperature detection circuit so that current flowing through the electric circuit does not exceed a current limit, and after the predetermined time period elapses, the controller adjusts the level of each control signal so that the current flowing through the electric circuit is allowed to exceed the current limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A power system for supplying power from a DC power supply to a load, comprising:
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a capacitance element; a power switching device switching an electric circuit connecting the DC power supply and the capacitance element in response to a command from an external source; and a power converter inserted along the electric circuit connecting the capacitance element and the load and including one or more semiconductor elements each allowing current to flow in accordance with a level of an input control signal, the power switching device comprising; one or more semiconductor elements, inserted along the electric circuit, each allowing current to flow at or below a maximum current determined according to a level of an input control signal, the current corresponding to a difference between a voltage of the DC power supply and a charging voltage of the capacitance element; a controller outputting a control signal individually to each of the one or more semiconductor elements provided in the power switching device; and a temperature detection circuit detecting a temperature of the one or more semiconductor elements, wherein until a predetermined time period elapses after receipt of a command to place the electric circuit into a closed state, the controller adjusts the level of each control signal in accordance with the temperature detected by the temperature detection circuit so that current flowing through the electric circuit does not exceed a predetermined current limit, and after the predetermined time period elapses, the controller adjusts the level of each control signal so that the current flowing through the electric circuit is allowed to exceed the current limit. - View Dependent Claims (21)
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Specification