POWER SUPPLY SYSTEM AND IMAGE FORMING APPARATUS HAVING THE POWER SUPPLY SYSTEM
First Claim
1. A power supply system comprising:
- a first capacitor including a first electrode and a second electrode, the first electrode being connected to one end of an alternating current power supply;
a second capacitor including a first electrode and a second electrode, the first electrode being connected to the other end of the alternating current power supply;
a rectification circuit that is electrically connected between the second electrode of the first capacitor and the second electrode of the second capacitor and is configured to rectify an alternating current voltage applied to the first and second capacitors;
a signal generation circuit that is connected to an output line of the rectification circuit and is configured to generate a detection signal corresponding to a zero cross point of an alternating current output of the alternating current power supply, based on an output of the rectification circuit;
an electricity storage unit that is connected to the output line of the rectification circuit at a more downstream position than the signal generation circuit;
a backflow regulation element that is provided on the output line of the rectification circuit and is configured to regulate backflow of current from the electricity storage unit towards the signal generation circuit;
a current limit element configured to limit current flowing from the output line of the rectification circuit towards the electricity storage unit, anda control unit that is connected to the output line of the rectification circuit, and is configured to detect a zero cross point of the alternating current output, based on the detection signal.
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Accused Products
Abstract
A power supply system includes: capacitors connected to an alternating current power supply; a rectification circuit connected to the capacitors and rectifying an alternating current voltage applied to the capacitors; a signal generation circuit connected to an output line of the rectification circuit and configured to generate a detection signal corresponding to a zero cross point of an alternating current output; an electricity storage unit connected to the output line of the rectification circuit; a backflow regulation element provided on the output line of the rectification circuit and configured to regulate backflow of current; a current limit element configured to limit current flowing from the output line of the rectification circuit towards the electricity storage unit, and a control unit that is connected to the output line of the rectification circuit, and is configured to detect a zero cross point of the alternating current output.
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Citations
11 Claims
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1. A power supply system comprising:
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a first capacitor including a first electrode and a second electrode, the first electrode being connected to one end of an alternating current power supply; a second capacitor including a first electrode and a second electrode, the first electrode being connected to the other end of the alternating current power supply; a rectification circuit that is electrically connected between the second electrode of the first capacitor and the second electrode of the second capacitor and is configured to rectify an alternating current voltage applied to the first and second capacitors; a signal generation circuit that is connected to an output line of the rectification circuit and is configured to generate a detection signal corresponding to a zero cross point of an alternating current output of the alternating current power supply, based on an output of the rectification circuit; an electricity storage unit that is connected to the output line of the rectification circuit at a more downstream position than the signal generation circuit; a backflow regulation element that is provided on the output line of the rectification circuit and is configured to regulate backflow of current from the electricity storage unit towards the signal generation circuit; a current limit element configured to limit current flowing from the output line of the rectification circuit towards the electricity storage unit, and a control unit that is connected to the output line of the rectification circuit, and is configured to detect a zero cross point of the alternating current output, based on the detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image forming apparatus comprising:
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a power supply system comprising; a first capacitor including a first electrode and a second electrode, the first electrode being connected to one end of an alternating current power supply; a second capacitor including a first electrode and a second electrode, the first electrode being connected to the other end of the alternating current power supply; a rectification circuit that is electrically connected between the second electrode of the first capacitor and the second electrode of the second capacitor and is configured to rectify an alternating current voltage applied to the first and second capacitors; a signal generation circuit that is connected to an output line of the rectification circuit and is configured to generate a detection signal corresponding to a zero cross point of an alternating current output of the alternating current power supply, based on an output of the rectification circuit; an electricity storage unit that is connected to the output line of the rectification circuit at a more downstream position than the signal generation circuit; a backflow regulation element that is provided on the output line of the rectification circuit and is configured to regulate backflow of current from the electricity storage unit towards the signal generation circuit; a current limit element configured to limit current flowing from the output line of the rectification circuit towards the electricity storage unit, and a control unit that is connected to the output line of the rectification circuit, and is configured to detect a zero cross point of the alternating current output, based on the detection signal; and an image forming unit that forms an image, wherein the control unit controls the image forming unit by using the detection of the zero cross point. - View Dependent Claims (11)
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Specification