Piezoelectric transformer type high-voltage power apparatus and image forming apparatus
First Claim
1. A power source apparatus in which a driving voltage determined by a value of a driving frequency is applied to a piezoelectric transformer to output an output voltage, the apparatus comprising:
- an output voltage detection unit to compare the output voltage with a reference voltage for controlling the output voltage, and based on a comparison result thereof, detect a change of the output voltage and represent the change with a digital value; and
a driving control unit to perform driving control of the piezoelectric transformer according to the digital value of the detected change by using the driving voltage to maintain the output voltage at a predetermined value.
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Abstract
A piezoelectric transformer high-voltage power source apparatus, in which a driving voltage determined by a value of a driving frequency is applied to a piezoelectric transformer, and thereby an output voltage output by the piezoelectric transformer is provided to a load, includes: an output voltage detection unit to compare an output voltage with a reference voltage for controlling the output voltage, in order to maintain the output voltage at a predetermined value, and based on the comparison result, detecting the change of the output voltage as a digital value; and a driving control unit to perform driving control of the piezoelectric transformer according to the detected digital value. The high-voltage power source apparatus performs stable frequency control without falling into an abnormal oscillation or uncontrollable state, and a high-voltage can be output within a short rise time.
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Citations
18 Claims
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1. A power source apparatus in which a driving voltage determined by a value of a driving frequency is applied to a piezoelectric transformer to output an output voltage, the apparatus comprising:
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an output voltage detection unit to compare the output voltage with a reference voltage for controlling the output voltage, and based on a comparison result thereof, detect a change of the output voltage and represent the change with a digital value; and a driving control unit to perform driving control of the piezoelectric transformer according to the digital value of the detected change by using the driving voltage to maintain the output voltage at a predetermined value. - View Dependent Claims (2, 3, 4, 5, 18)
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6. A power source apparatus in which a driving voltage determined by a value of a driving frequency is applied to a piezoelectric transformer to output an output voltage output, the apparatus comprising:
a driving control unit to calculate a change in the output voltage based on the output voltage and a reference voltage for controlling the output voltage, in order to maintain the output voltage at a predetermined value, and to control the driving frequency of the piezoelectric transformer by digital signal processing based on the calculated change. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A power source apparatus in which a driving voltage determined by a value of a driving frequency is applied to a piezoelectric transformer to output an output voltage, the apparatus comprising:
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an output voltage detection unit to compare the output voltage with a reference voltage for controlling the output voltage, and based on a comparison result thereof, detect a change of the output voltage and indicate the change with a digital value; a driving control unit to perform driving control of the piezoelectric transformer according to the digital value of the detected change in order to maintain the output voltage at a predetermined value; and a drive voltage control unit to vary and control a power source voltage applied to the piezoelectric transformer according to the comparison result of the output voltage with the reference voltage. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification