Piezoelectric transformer inverter
First Claim
1. A piezoelectric transformer inverter comprising:
- a piezoelectric transformer having a pair of primary electrodes, one of which primary electrodes is grounded, which performs voltage conversion of an alternating input voltage or a direct current input voltage applied between the primary electrodes to supply an output voltage to a load connected to a secondary electrode of the piezoelectric transformer;
a drive unit for supplying the alternating input voltage or the direct current input voltage between the primary electrodes of the piezoelectric transformer;
a low-pass type resonance circuit unit inserted between an output of the drive unit and the primary electrodes of the piezoelectric transformer;
a duty control unit for controlling an ON-Duty of the drive unit so that a value of a current flowing into the load coincides with a targeted current value;
a phase-difference detection unit for detecting a phase difference between the input voltage and the output voltage of the piezoelectric transformer; and
a frequency control unit for controlling a driving frequency of the drive unit so as to give the phase difference a specified value.
1 Assignment
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Accused Products
Abstract
A piezoelectric transformer inverter includes: a piezoelectric transformer, one of whose primary electrodes is grounded, which performs voltage conversion of alternating voltage or direct current voltage applied between the primary electrodes and supplies the converted voltage to a load connected to a secondary electrode; a drive unit for supplying alternating voltage or direct current voltage between the primary electrodes of the piezoelectric transformer; a low-pass type resonance circuit unit inserted between the output of the drive unit and the primary electrodes of the piezoelectric transformer; a duty control unit for controlling ON-Duty of the drive unit so that a value of current flowing into the load coincides with a targeted current value; a phase-difference detection unit for detecting a phase difference between the input voltage and the output voltage of the piezoelectric transformer; and a frequency control unit for controlling a driving frequency of the drive unit.
50 Citations
16 Claims
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1. A piezoelectric transformer inverter comprising:
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a piezoelectric transformer having a pair of primary electrodes, one of which primary electrodes is grounded, which performs voltage conversion of an alternating input voltage or a direct current input voltage applied between the primary electrodes to supply an output voltage to a load connected to a secondary electrode of the piezoelectric transformer; a drive unit for supplying the alternating input voltage or the direct current input voltage between the primary electrodes of the piezoelectric transformer; a low-pass type resonance circuit unit inserted between an output of the drive unit and the primary electrodes of the piezoelectric transformer; a duty control unit for controlling an ON-Duty of the drive unit so that a value of a current flowing into the load coincides with a targeted current value; a phase-difference detection unit for detecting a phase difference between the input voltage and the output voltage of the piezoelectric transformer; and a frequency control unit for controlling a driving frequency of the drive unit so as to give the phase difference a specified value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A piezoelectric transformer inverter comprising:
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a piezoelectric transformer having primary electrodes for performing voltage conversion of an alternating input voltage or a direct current voltage applied between the primary electrodes to supply an output voltage to a load connected to a secondary electrode; a drive unit for supplying the alternating input voltage or the direct current input voltage separately to the two primary electrodes of the piezoelectric transformer; a low-pass type resonance circuit unit inserted between an output of the drive unit and the primary electrodes of the piezoelectric transformer; a duty control unit for controlling the ON-Duty of the drive unit so that a value of current flowing into the load coincides with a targeted current value; a phase-difference detection unit for detecting a phase difference between the input voltage and the output voltage of the piezoelectric transformer; and a frequency control unit for controlling a driving frequency of the drive unit so as to give the phase difference a specified value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification