Abstract: In a switching power source, an OFF-period of switching is set according to a resonance cycle when a transformer is driven.

Abstract: A power supply device controls drive of a synchronous rectification switch unit by converting a voltage into a current, and comparing a voltage obtained by current-to-voltage conversion with a predetermined value.

Abstract: A synchronous rectification power supply controls driving of a switching unit in such a manner as to start the driving in response to rising of an output voltage at a secondary side of a transformer and to stop the driving after a predetermined time passed.

Abstract: In a power supply apparatus, a current limitation unit configured to detect a current flowing through a primary winding of a transformer to limit a current to a switching unit has a self-holding unit configured to self-hold a state where the current to the switching unit is limited.

Abstract: The transformer includes: first and second cores each including a magnetic center leg and a magnetic outer leg positioned outside of the magnetic center leg; a first adhesion part that adheres the magnetic center leg of the first core and the magnetic center leg of the second core to each other; a second adhesion part that adheres the magnetic outer leg of the first core and the magnetic outer leg of the second core to each other; a bobbin inserted through the magnetic center leg of the first core and the magnetic center leg of the second core, a primary coil and a secondary coil being wound on the bobbin; and an elastic member that applies pressure to the magnetic outer leg of the first core and the magnetic outer leg of the second core in a neighborhood of the second adhesion part, in an inward direction of the transformer.

Abstract: The power supply apparatus for obtaining a direct current from an alternating voltage source includes a first DC/DC converter for outputting a first direct current and a second DC/DC converter for a second direct current lower than the first direct current from the first DC/DC converter, and the output voltage of the first DC/DC converter is changed to a lower direct current and the second DC/DC converter is driven in a continuously-conducting state.

Abstract: An image processing apparatus includes a receiving unit for receiving image information, a storage unit for storing the image information received by the receiving unit, an output unit for outputting the image information received by the receiving unit, a discriminating unit for discriminating among modes used when the image information is output by the output unit, and a control unit in which after the image information is output by the output unit in accordance with discrimination by the discriminating unit, the control unit performs control so that the image information output by the output unit is not stored in the storage unit.

Abstract: An image processing apparatus includes a receiving unit for receiving image information, a storage unit for storing the image information received by the receiving unit, an output unit for outputting the image information received by the receiving unit, a discriminating unit for discriminating among modes used when the image information is output by the output unit, and a control unit in which after the image information is output by the output unit in accordance with discrimination by the discriminating unit, the control unit performs control so that the image information output by the output unit is not stored in the storage unit.

Abstract: An image processing apparatus includes a receiving unit for receiving image information, a storage unit for storing the image information received by the receiving unit, an output unit for outputting the image information received by the receiving unit, a discriminating unit for discriminating among modes used when the image information is output by the output unit, and a control unit in which after the image information is output by the output unit in accordance with discrimination by the discriminating unit, the control unit performs control so that the image information output by the output unit is not stored in the storage unit.

Abstract: An induction heating apparatus for a fixing device of an image forming apparatus includes a rectifying circuit for rectifying a commercial power supply, an excitation coil, a switching element for switching the supply of the output of the rectifying circuit to the excitation coil, and a switching signal output unit for outputting a switching signal for the switching element thereby supplying the excitation coil with a high frequency current. The invention limits a current supply time to the excitation coil in such a manner that the maximum output for induction heating is set according to the commercial power supply voltage, thereby reducing the first print time without a power consumption in excess of the rating.

Abstract: An image processing apparatus includes a receiving unit for receiving image information, a storage unit for storing the image information received by the receiving unit, an output unit for outputting the image information received by the receiving unit, a discriminating unit for discriminating among modes used when the image information is output by the output unit, and a control unit in which after the image information is output by the output unit in accordance with discrimination by the discriminating unit, the control unit performs control so that the image information output by the output unit is not stored in the storage unit.

Abstract: An image processing apparatus includes a receiving unit for receiving image information, a storage unit for storing the image information received by the receiving unit, an output unit for outputting the image information received by the receiving unit, a discriminating unit for discriminating among modes used when the image information is output by the output unit, and a control unit in which after the image information is output by the output unit in accordance with discrimination by the discriminating unit, the control unit performs control so that the image information output by the output unit is not stored in the storage unit.

Abstract: An induction heating apparatus for a fixing device of an image forming apparatus includes a rectifying circuit for rectifying a commercial power supply, an excitation coil, a switching element for switching the supply of the output of the rectifying circuit to the excitation coil, and a switching signal output unit for outputting a switching signal for the switching element thereby supplying the excitation coil with a high frequency current.

Abstract: This invention provides a power supply device which widens a narrow output control width which is a drawback of a conventional voltage resonant power supply, and in adopting as a switching control element a low-cost IGBT (Insulated Gate Bipolar Transistor) which permits a large current, optimizes a gate signal waveform to minimize a switching loss in control because the IGBT has a larger loss than an FET. A voltage resonant converter includes a switching IGBT (201) connected to a power supply, a first resonant capacitor (204) series-connected to the IGBT (201), an IGBT (202) series-connected to the first resonant capacitor (204), an exciting coil (18) connected between the power supply and a node between the first resonant capacitor (204) and the IGBT (202), a second resonant capacitor (205) parallel-connected to the IGBT (202), and regenerative diodes (206, 207) respectively parallel-connected to the IGBTs (201, 202).

Abstract: A heating device for heating a material to be heated according to a magnetic-induction heating method includes a magnetic-field generator for generating a magnetic field, an electromagnetic-induction heating member for performing electromagnetic-induction heating by the magnetic field generated by the magnetic-field generator, a current detector for detecting a current flowing in the magnetic-field generator, a controller for controlling electric power supplied to the magnetic-field generator based on a result of detection of the current detector, and a current limiter for limiting a maximum current flowing in the magnetic-field generator based on the result of detection of the current detector.

Abstract: A power supply device and a voltage resonance method are provided, which are free from a reduced switching loss, as well as from the situation in which soft switching operations for generating an alternating magnetic field cannot be executed. A first charging device is connected in series with a first switching device, a second switching device is connected in series with the first charging device, and a magnetic field generating device is connected between a power supply line and a node between the first charging device and the second switching device. A second charging device is connected in parallel with the second switching device, a first rectifying device is connected in parallel with the first switching device, and a second rectifying device connected in parallel with the second switching device.

Abstract: The present invention relates to an image heating apparatus which has magnetic flux generating device, a heat generating body for electromagnetically inductively generating heat due to an operation of a magnetic flux generated by the magnetic flux generating device, a conductor provided so as to surround a part of the magnetic flux generated by the magnetic flux generating device, switching device which is connected to the conductor and which can form an electrically closed circuit by using the conductor, and control device for controlling an ON/OFF ratio of the switching device in accordance with a kind of a recording material.

Abstract: An image heating apparatus is constructed by a heat generating member having a conductive layer and a magnetic field generating apparatus for generating a magnetic field. The magnetic field generating apparatus has an exciting coil and an electric power is supplied from a power source to the exciting coil by a switching circuit. An eddy current is generated in the heating member by the magnetic field generated by the magnetic field generating apparatus, the heat generating member generates a heat by the eddy current, and an image on a recording material is heated by the heat. The exciting coil has a first coil portion and a second coil portion for matching the impedances of the first coil portion and the heat generating member. The first coil portion and the second coil portion are neighboring. The magnetic coupling between the second coil portion and the heat generating member is weaker than that between the first coil portion and the heat generating member.

Abstract: A temperature detecting apparatus, includes an excitation coil magnetically couplable with metal layer of a heater, the excitation coil being supplied with an AC electric energy; and a detector for detecting a voltage drop, across the excitation coil, which changes with temperature of the heater. The metal layer has a metal ring and the excitation coil is magnetically connected with the metal ring.

Abstract: An image heating apparatus includes an electroconductive heat generating element; an excitation coil for producing a magnetic flux, the excitation coil produces a magnetic flux which is effective to generate eddy current in the electroconductive heat generating element to generate heat in the electroconductive heat generating element; an electric circuit for energizing the excitation coil, the electric circuit having a series resonance circuit and a switching element connected with the series resonance circuit; electric power supply control means for controlling the switching element to effect switching between an energization state and non-energization state for the series resonance circuit.