Patent application number | Description | Published |
20080297129 | HIGH-VOLTAGE POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS EMPLOYING SAME - The voltage at a spurious frequency is decreased while maintaining as much as possible the voltage at a resonance frequency of a piezoelectric transformer, thus controlling a wide voltage range with a comparatively low cost configuration. A high-voltage power supply apparatus includes a piezoelectric transformer that outputs a highest voltage at a predetermined resonance frequency, and a generating unit that generates a signal that oscillates at a drive frequency that drives the piezoelectric transformer, throughout a frequency range that includes the resonance frequency. Furthermore, the high-voltage power supply apparatus includes an output terminal connected to the piezoelectric transformer, and a constant-voltage element inserted in a path that couples the piezoelectric transformer and the output terminal. | 12-04-2008 |
20100290203 | PRINTED CIRCUIT BOARD EQUIPPED WITH PIEZOELECTRIC ELEMENT - An electronic apparatus includes, for example, a circuit board with an electronic component and a piezoelectric element, a reference potential pattern that gives a reference potential to at least one of the electronic component and the piezoelectric element, and a solder land connected to the reference potential pattern. On the circuit board, the electronic component is located on a downstream side in a transport direction of the circuit board during mounting of the piezoelectric element and the electronic component on the solder land, and the piezoelectric element is located on an upstream side in the transport direction. | 11-18-2010 |
20110097100 | TECHNOLOGY FOR REDUCING CIRCUIT OSCILLATIONS AND RIPPLE IN A HIGH-VOLTAGE POWER SUPPLY USING A PIEZOELECTRIC TRANSFORMER - A high-voltage power supply comprises the following components. A piezoelectric transformer outputs a voltage in accordance with a supplied drive frequency. A rectification part is connected to an output side of the piezoelectric transformer. A drive frequency generating part generates the drive frequency supplied to the piezoelectric transformer. A voltage detection part detects an output voltage of the piezoelectric transformer or the rectification part. A control part controls the drive frequency generating part such that a drive frequency corresponding to the output voltage detected by the voltage detecting part is generated. A first time constant, which is a time constant of the control part, is smaller than a second time constant, which is a time constant of a control target including the piezoelectric transformer and the rectification part. A third time constant, which is a time constant of the voltage detecting part, is smaller than the second time constant. | 04-28-2011 |
20110157933 | HIGH VOLTAGE POWER SUPPLY - A high voltage power supply may include a switching unit, a voltage resonant unit, a connection part, a rectifier unit, a voltage amplifying unit, a voltage output unit, and a frequency control unit. The switching unit is driven per a frequency signal. The voltage resonant unit is connected to the switching unit and includes an inductor, to which a voltage is applied, and a capacitor. The connection part connects the switching unit and the inductor. The rectifier unit includes a diode that is connected to a power-supply voltage side of the inductor via a capacitor. The voltage output unit outputs a voltage obtained from the voltage amplifying unit. Moreover, the frequency control unit controls a frequency of the frequency signal per a control signal used to set a voltage output from the voltage output unit and an output signal output from the voltage output unit. | 06-30-2011 |
20120082497 | IMAGE FORMING APPARATUS AND STAPLER - An image forming apparatus having a stapler includes an image forming unit configured to form an image on a recording material, a power source configured to supply electric power to the image forming unit and the stapler, and a control unit configured to control the operation of the stapler. In the image forming apparatus, a time period for prohibiting the operation of the stapler is set such that a total of a power consumption of the image forming unit and a power consumption of the stapler is equal to or less than an electric power the power source can supply so as to perform the operation of the stapler and the operation of the image forming unit partially in parallel with each other. | 04-05-2012 |
20120087162 | HIGH VOLTAGE POWER SUPPLY - A high voltage power supply includes a frequency signal generation unit, a voltage generation unit, and a voltage amplifying unit. The frequency signal generation unit generates a frequency signal. The voltage generation unit generates an input voltage according to the frequency signal generated by the frequency signal generation unit. The voltage amplifying unit amplifies and outputs the input voltage by rectifying and smoothing the input voltage a plurality of times. A voltage output by the voltage amplifying unit is changed by changing a frequency of the frequency signal. | 04-12-2012 |
20130004196 | PRINTED CIRCUIT BOARD, POWER SUPPLY APPARATUS, IMAGE FORMING APPARATUS, AND PRINTED CIRCUIT BOARD MANUFACTURING METHOD - A piezoelectric transformer includes a piezoelectric element. Two primary side electrodes exist on the primary side of the piezoelectric element. The primary side electrodes are coupled by a resistor formed from a conductive coating. A discharge current is discharged via the resistor to protect a semiconductor component from the discharge current. Since neither a short-circuit terminal nor conductive jig is required, electrostatic discharge damage to a semiconductor component can be prevented by a low-cost arrangement. | 01-03-2013 |
20130209133 | TECHNOLOGY FOR REDUCING CIRCUIT OSCILLATIONS AND RIPPLE IN A HIGH-VOLTAGE POWER SUPPLY USING A PIEZOELECTRIC TRANSFORMER - A high-voltage power supply comprises the following components. A piezoelectric transformer outputs a voltage in accordance with a supplied drive frequency. A rectification part is connected to an output side of the piezoelectric transformer. A drive frequency generating part generates the drive frequency supplied to the piezoelectric transformer. A voltage detection part detects an output voltage of the piezoelectric transformer or the rectification part. A control part controls the drive frequency generating part such that a drive frequency corresponding to the output voltage detected by the voltage detecting part is generated. A first time constant, which is a time constant of the control part, is smaller than a second time constant, which is a time constant of a control target including the piezoelectric transformer and the rectification part. A third time constant, which is a time constant of the voltage detecting part, is smaller than the second time constant. | 08-15-2013 |