Inrush current prevention circuit, inrush current prevention method, and computer readable medium
AssigneeFanuc Corporation
InventorJun Okamoto
Life of this patent
Estimating the term…
Abstract
An inrush current prevention circuit includes: a voltage detection unit configured to detect a value of an input voltage applied by a power supply; a current detection unit configured to detect a value of an input current input from the power supply; a current limiting element configured to limit the input current; a voltage drop detection unit configured to detect a voltage drop in the power supply resulting from inrush currents using a detection voltage value detected by the voltage detection unit and a detection current value detected by the current detection unit; and a control unit configured to decrease a current limiting level of the current limiting element when the voltage drop detection unit detects the voltage drop.
Claims11
An inrush current prevention circuit comprising:
- a voltage detection unit configured to detect a value of an input voltage applied by a power supply;
- a current detection unit configured to detect a value of an input current input from the power supply;
- a current limiting element configured to limit the input current;
- a voltage drop detection unit configured to detect a voltage drop in the power supply resulting from inrush currents using a detection voltage value detected by the voltage detection unit and a detection current value detected by the current detection unit;
- and
- a control unit configured to decrease a current limiting level of the current limiting element when the voltage drop detection unit detects the voltage drop,
- wherein the voltage drop detection unit detects the voltage drop based on a value obtained by dividing the detection voltage value by the detection current value.
An inrush current prevention circuit comprising:
- a voltage detection unit for detecting a value of an input voltage applied by a power supply;
- a current detection unit for detecting a value of an input current input from the power supply;
- a current limiting element for limiting the input current;
- a voltage drop detection unit for detecting a voltage drop in the power supply resulting from inrush currents using a detection voltage value detected by the voltage detection unit and a detection current value detected by the current detection unit;
- and
- a control unit for decreasing a current limiting level of the current limiting element when the voltage drop detection unit detects the voltage drop,
- wherein the voltage drop detection unit detects the voltage drop based on a value obtained by dividing a difference between the detection voltage value and a reference voltage value by a difference between the detection current value and a reference current value.
An inrush current prevention method in an inrush current prevention circuit, the method comprising:
- detecting a value of an input voltage applied by a power supply;
- detecting a value of an input current input from the power supply;
- detecting a voltage drop in the power supply resulting from inrush currents based on a value obtained by dividing the detected value of the input voltage by the detected value of the input current;
- and
- decreasing a current limiting level of a current limiting element that limits the input current when the voltage drop is detected.
An inrush current prevention method
- in an inrush current prevention circuit, the method comprising:
- detecting a value of an input voltage applied by a power supply;
- detecting a value of an input current input from the power supply;
- detecting a voltage drop in the power supply resulting from inrush currents based on a value obtained by dividing a difference between the detected value of the input voltage and a reference voltage value by a difference between the detected value of the input current and a reference current value;
- and
- decreasing a current limiting level of a current limiting element that limits the input current when the voltage drop is detected.
An inrush current prevention program being used in an inrush current prevention circuit comprising:
- a voltage detection unit for detecting a value of an input voltage applied by a power supply;
- a current detection unit for detecting a value of an input current input from the power supply;
- a current limiting element for limiting the input current;
- a voltage drop detection unit for detecting a voltage drop in the power supply;
- and
- a control unit for decreasing a current limiting level of the current limiting element when the voltage drop detection unit detects the voltage drop, the program causing a computer as the voltage drop detection unit to execute:
- detecting the voltage drop in the power supply resulting from inrush currents based on a value obtained by dividing the value of the input voltage detected by the voltage detection unit, by the value of the input current detected by the current detection unit;
- and
- notifying the control unit of the detected voltage drop.
Dependencies are inferred from the claim text.