Abstract: According to one embodiment, a temperature control device includes a temperature estimation unit and a frequency generation unit. The temperature estimation unit is configured to estimate a temperature of an object being heated by an induction heating coil, the temperature being estimated based on a frequency of a drive signal supplied to an inverter connected to the induction heating coil. The frequency generation unit is configured to set the frequency of the drive signal based on the temperature estimated by the temperature estimation unit, a detected temperature of the object from a temperature sensor, and a target temperature for the object.

Abstract: According to one embodiment, the temperature control device is a temperature control device for controlling temperature of a temperature controlled target to which heat is propagated from a heater by supplying power to the heater, the device including: a temperature estimation unit; a duty generation unit; and a signal generation unit. The temperature estimation unit estimates the temperature of the temperature controlled target based on the duty value. The duty generation unit generates the duty value based on the temperature estimation result by the temperature estimation unit, the temperature detection result of the temperature controlled target by the temperature sensor, and the target temperature. The signal generation unit outputs an energization pulse for controlling the power supplied to the heater based on the duty value.

Abstract: According to one embodiment, a temperature control device stores a fixing device temperature estimation value and a storage time obtained by WAE control in a memory at any time during operation. After an electric power supply to the temperature control device is stopped, the next time the electric power supply is started, an electric power supply stop period until the electric power supply is started is calculated. If the electric power supply stop period is shorter than a set time, the WAE control is started by using the stored fixing device temperature estimation value, and if the electric power supply stop period exceeds the set time, the WAE control is started based on an initial set value.

Abstract: A power converting device includes a totem pole type power factor improving circuit and a control circuit. The totem pole type power factor improving circuit includes a coil connected to a first terminal of an AC power supply, a first half-wave switch in which a source terminal is connected to the coil via a first current detector, a second half-wave switch in which a drain terminal is connected to the coil via a second current detector, a first diode in which a cathode is connected to a drain terminal of the first half-wave switch and an anode is connected to a second terminal of the AC power supply, a second diode in which an anode is connected to a source terminal of the second half-wave switch and a cathode is connected to the second terminal of the AC power supply, and a smoothing capacitor connected between the cathode of the first diode and the anode of the second diode.

Abstract: A power converting device includes a totem pole type power factor improving circuit that includes a coil connected to a first terminal of an AC power supply, a first half-wave switch in which a source terminal is connected to the coil via a first current detector, a second half-wave switch in which a drain terminal is connected to the coil via a second current detector, a first diode in which a cathode is connected to a drain terminal of the first half-wave switch and an anode is connected to a second terminal of the AC power supply, a second diode in which an anode is connected to a source terminal of the second half-wave switch and a cathode is connected to the second terminal of the AC power supply, and a smoothing capacitor connected between the cathode of the first diode and the anode of the second diode.

Abstract: According to one embodiment, a temperature control device stores a fixing device temperature estimation value and a storage time obtained by WAE control in a memory at any time during operation. After an electric power supply to the temperature control device is stopped, the next time the electric power supply is started, an electric power supply stop period until the electric power supply is started is calculated. If the electric power supply stop period is shorter than a set time, the WAE control is started by using the stored fixing device temperature estimation value, and if the electric power supply stop period exceeds the set time, the WAE control is started based on an initial set value.

Abstract: A power converter includes a first circuit including an inductor and configured to convert an input voltage into a first voltage, a second circuit including a transformer and configured to convert the first voltage input to the insulating transformer to a second voltage, a control circuit configured to control the first circuit, a first power supply circuit including a first winding magnetically coupled to the inductor and configured to output a third voltage generated by the first winding to the first control circuit, and a second power supply circuit including a second winding magnetically coupled to the transformer and configured to output a fourth voltage generated by the second winding to the first control circuit. When the second voltage is not output the third voltage is output to the control circuit, and when the second voltage is output the fourth voltage is output to the control circuit.

Abstract: A temperature control device according to one embodiment includes a temperature estimation unit, a comparison unit, and an energization control unit. The temperature estimation unit estimates a temperature of an object based on energization of elements related to temperature control of the object. The comparison unit compares a difference between a detected temperature of the object and an estimated temperature of the object. If the difference exceeds a reference value, the energization control unit stops energizing the elements related to the temperature control of the object.

Abstract: According to one embodiment, a temperature control device includes a temperature estimation unit and a frequency generation unit. The temperature estimation unit is configured to estimate a temperature of an object being heated by an induction heating coil, the temperature being estimated based on a frequency of a drive signal supplied to an inverter connected to the induction heating coil. The frequency generation unit is configured to set the frequency of the drive signal based on the temperature estimated by the temperature estimation unit, a detected temperature of the object from a temperature sensor, and a target temperature for the object.

Abstract: According to one embodiment, a temperature control apparatus supplies power to a heater to control temperature of a temperature control target. The temperature control apparatus includes a temperature estimation unit to estimate a temperature of a temperature control target based on electrical power supplied to the heater. The temperature control apparatus also includes control signal generation unit that calculates a duty value for the heater based on an estimated temperature from the temperature estimation unit, a detected temperature from a temperature sensor, and a target temperature for the temperature control target. A pulse signal for controlling the electrical power supplied to the heater is generated based on the calculated duty value.

Abstract: According to one embodiment, a temperature control device stores a fixing device temperature estimation value and a storage time obtained by WAE control in a memory at any time during operation. After an electric power supply to the temperature control device is stopped, the next time the electric power supply is started, an electric power supply stop period until the electric power supply is started is calculated. If the electric power supply stop period is shorter than a set time, the WAE control is started by using the stored fixing device temperature estimation value, and if the electric power supply stop period exceeds the set time, the WAE control is started based on an initial set value.

Abstract: A power converter includes a first circuit including an inductor and configured to convert an input voltage into a first voltage, a second circuit including a transformer and configured to convert the first voltage input to the insulating transformer to a second voltage, a control circuit configured to control the first circuit, a first power supply circuit including a first winding magnetically coupled to the inductor and configured to output a third voltage generated by the first winding to the first control circuit, and a second power supply circuit including a second winding magnetically coupled to the transformer and configured to output a fourth voltage generated by the second winding to the first control circuit. When the second voltage is not output the third voltage is output to the control circuit, and when the second voltage is output the fourth voltage is output to the control circuit.

Abstract: A power converter includes a first circuit including an inductor and configured to convert an input voltage into a first voltage, a second circuit including a transformer and configured to convert the first voltage input to the insulating transformer to a second voltage, a control circuit configured to control the first circuit, a first power supply circuit including a first winding magnetically coupled to the inductor and configured to output a third voltage generated by the first winding to the first control circuit, and a second power supply circuit including a second winding magnetically coupled to the transformer and configured to output a fourth voltage generated by the second winding to the first control circuit. When the second voltage is not output the third voltage is output to the control circuit, and when the second voltage is output the fourth voltage is output to the control circuit.

Abstract: A power conversion device includes first and second current detectors. A coil is connected a first power terminal through the first and second current detectors. A first switch has a source terminal connected to the coil and a second semiconductor switch has a drain terminal connected to the coil. A first diode is connected between a drain terminal of the first semiconductor switch and a second power supply terminal. A second diode is connected between a source terminal of the second semiconductor switch and the second power terminal. A capacitor is connected in parallel with the first and second diodes. A control circuit is configured to turn the first and second semiconductor switches on or off based on current detections of the first and second current detectors.

Abstract: According to one embodiment, a temperature control apparatus supplies power to a heater to control temperature of a temperature control target. The temperature control apparatus includes a temperature estimation unit to estimate a temperature of a temperature control target based on electrical power supplied to the heater. The temperature control apparatus also includes control signal generation unit that calculates a duty value for the heater based on an estimated temperature from the temperature estimation unit, a detected temperature from a temperature sensor, and a target temperature for the temperature control target. A pulse signal for controlling the electrical power supplied to the heater is generated based on the calculated duty value.

Abstract: A temperature control device controls a temperature of a temperature control target to which heat propagates from a heater by supplying power to the heater and includes a control circuit. The control circuit includes a temperature estimation unit and a control signal generation unit. The temperature estimation unit estimates the temperature of the temperature control target based on conduction to the heater. The control signal generation unit outputs a conduction pulse for controlling power to be supplied to the heater based on a temperature estimation result and a temperature detection result of the temperature control target by a temperature sensor.

Abstract: According to one embodiment, there is provided a power converter including a totem-pole power factor correction circuit that can achieve reduction in recovery loss with a simple structure. A power converter according to an embodiment includes a totem-pole power factor correction circuit, a series connection of a first current detector and a second current detector, and a control circuit.

Abstract: A power converting device includes a totem pole type power factor improving circuit and a control circuit. The totem pole type power factor improving circuit includes a coil connected to a first terminal of an AC power supply, a first half-wave switch in which a source terminal is connected to the coil via a first current detector, a second half-wave switch in which a drain terminal is connected to the coil via a second current detector, a first diode in which a cathode is connected to a drain terminal of the first half-wave switch and an anode is connected to a second terminal of the AC power supply, a second diode in which an anode is connected to a source terminal of the second half-wave switch and a cathode is connected to the second terminal of the AC power supply, and a smoothing capacitor connected between the cathode of the first diode and the anode of the second diode.

Abstract: A temperature control device controls a temperature of a temperature control target to which heat propagates from a heater by supplying power to the heater and includes a control circuit. The control circuit includes a temperature estimation unit and a control signal generation unit. The temperature estimation unit estimates the temperature of the temperature control target based on conduction to the heater. The control signal generation unit outputs a conduction pulse for controlling power to be supplied to the heater based on a temperature estimation result and a temperature detection result of the temperature control target by a temperature sensor.

Abstract: According to one embodiment, there is provided a power converter including a totem-pole power factor correction circuit that can achieve reduction in recovery loss with a simple structure. A power converter according to an embodiment includes a totem-pole power factor correction circuit, a series connection of a first current detector and a second current detector, and a control circuit.