POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS
First Claim
1. A power supply apparatus comprising:
- a first power supply that outputs a constant voltage using an externally supplied power as an input source;
a second power supply that outputs a constant current using a power charged in a capacitor as an input source;
a circuit unit that connects an output from the first power supply and an output from the second power supply in parallel, and simultaneously supplies a power from the first power supply and a power from the second power supply to a load;
a current detector that detects a current supplied to the load;
a control unit that controls an output current from the first power supply to equal to or lower than an upper-limit value, and controls an output current from the second power supply to a value obtained by subtracting the upper-limit value from the current detected by the current detector;
a residual power detector that detects a residual power of the capacitor; and
an abnormality detector that estimates the residual power of the capacitor according to an operating state of the power supply apparatus and detects an abnormality in simultaneously supplied power, based on detected residual power and estimated residual power.
1 Assignment
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Accused Products
Abstract
A circuit unit connects outputs from a first power supply and a second power supply in parallel, and simultaneously supplies powers from both power supplies to a load. A control unit controls an output current from the first power supply to an upper-limit value or lower, and controls an output current from the second power supply to a value obtained by subtracting the upper-limit value from a current detected by a current detector. An abnormality detector detects an abnormality in simultaneously supplied power, based on a reference current value associated with an operating state of the power supply apparatus and the current detected by the current detector.
36 Citations
11 Claims
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1. A power supply apparatus comprising:
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a first power supply that outputs a constant voltage using an externally supplied power as an input source; a second power supply that outputs a constant current using a power charged in a capacitor as an input source; a circuit unit that connects an output from the first power supply and an output from the second power supply in parallel, and simultaneously supplies a power from the first power supply and a power from the second power supply to a load; a current detector that detects a current supplied to the load; a control unit that controls an output current from the first power supply to equal to or lower than an upper-limit value, and controls an output current from the second power supply to a value obtained by subtracting the upper-limit value from the current detected by the current detector; a residual power detector that detects a residual power of the capacitor; and an abnormality detector that estimates the residual power of the capacitor according to an operating state of the power supply apparatus and detects an abnormality in simultaneously supplied power, based on detected residual power and estimated residual power. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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2. A power supply apparatus comprising:
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a first power supply that outputs a constant voltage using an externally supplied power as an input source; a second power supply that outputs a constant current using a power charged in a capacitor as an input source; a circuit unit that connects an output from the first power supply and an output from the second power supply in parallel, and simultaneously supplies a power from the first power supply and a power from the second power supply to a load; a first current detector that detects a current supplied to the load; a control unit that controls an output current from the first power supply to equal to or lower than an upper-limit value, and controls an output current from the second power supply to a value obtained by subtracting the upper-limit value from the current detected by the current detector; a second current detector that detects the output current from the second power supply; and an abnormality detector that detects an abnormality in simultaneously supplied power, based on the output current from the second power supply detected by the second current detector, the upper-limit value, and the current detected by the first current detector.
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Specification