Multiple power supply unit with improved overcurrent sensitivity
AssigneeKabushiki Kaisha Toshiba
InventorsShinya Higashi, Kazuhiro Ito
Life of this patent
Estimating the term…
Abstract
A multiple power supply unit includes two DC stabilized power supplies that provide electrical power in parallel to a load, each power supply providing its own operation indication to the other power supply. Each power supply changes a reference voltage used to detect excess current of its own output to the load according to whether the operation indication is received from the other power supply.
Claims23
A multiple power supply unit, comprising:
- a plurality of individual power supplies, including first and second power supplies, which provide electrical power in parallel to a load, each individual power supply including
- an overcurrent detection circuit for detecting excess output current to the load relative to a reference value,
- means for providing an operation indication of the individual power supply, each of the first and second power supplies coupled to receive the operation indication of the second and first power supplies, respectively, and
- a reference value circuit for changing the reference value based on a total number of individual power supplies from which the operation indication is received.
A multiple power supply unit, comprising:
- a plurality of individual power supplies, including first and second power supplies, which provide electrical power in parallel to a load, each individual power supply including
- means for detecting excess output current to the load relative to a reference value,
- means for providing an operation indication of the individual power supply, each of the first and second power supplies coupled to receive the operation indication of the second and first power supplies, respectively, and
- means for changing the reference value based on a total number of individual power supplies from which the operation indication is received.
A multiple power supply unit, comprising:
- first and second power supplies which provide electrical power in parallel to a load, each power supply including
- a transformer including a primary circuit and a secondary circuit, the primary circuit connecting to a power source, and the secondary circuit connecting to the load;
- means for extracting a voltage generated across a resistor in the secondary circuit;
- means for detecting excess output current to the load by comparing the generated voltage to a reference voltage;
- means for controlling an input to the primary circuit from the power source, based on whether the excess current is detected;
- means for providing an operation indication of the power supply, each of the first and second power supplies coupled to receive the operation indication of the second and first power supplies, respectively;
- and
- means for changing the reference voltage based on a total number of individual power supplies from which the operation indication is received.
A power supply for use in a multiple power supply unit that includes a plurality of the power supplies which provide electrical power in parallel to a load, the power supply comprising:
- an overcurrent detection circuit for detecting excess output current to the load relative to a reference value;
- means for providing an operation indication of the power supply to another one of the power supplies;
- means for receiving the operation indication from another one of the power supplies;
- and
- a reference value circuit for changing the reference value based on a total number of individual power supplies from which the operation indication is received.
A power supply for use in a multiple power supply unit that includes a plurality of the power supplies which provide electrical power in parallel to a load, the power supply comprising:
- means for detecting excess output current to the load relative to a reference value;
- means for providing an operation indication of the power supply to another one of the power supplies;
- means for receiving the operation indication from another one of the power supplies;
- and
- means for changing the reference value based on a total number of individual power supplies from which the operation indication is received.
A power supply for use in a multiple power supply unit that includes first and second power supplies which provide electrical power in parallel to a load, the power supply comprising:
- a transformer including a primary circuit and a secondary circuit, the primary circuit connecting to a power source, and the secondary circuit connecting to the load;
- means for extracting a voltage generated across a resistor in the secondary circuit;
- means for detecting excess output current to the load by comparing the generated voltage to a reference voltage;
- means for controlling an input to the primary circuit from the power source, based on whether the excess current is detected;
- means for providing an operation indication, of the power supply, each of the first and second power supplies to receive the operation indication of the second and first power supplies, respectively;
- and
- means for changing the reference voltage based on a total number of individual power supplies from which the operation indication is received.
Dependencies are inferred from the claim text.