| 摘要 |
The present invention provides a piezoelectric transformer driving apparatus which drives a load balanced to the ground, which makes an insulating component, such as a current transformer or a photocoupler, unnecessary, and which can detect a load current. For this reason, the present invention has two secondary windings ( 1 B, 1 C) which generate AC drive voltages respectively, a piezoelectric transformer ( 2 ) which generates a high voltage AC from the drive voltage generated by the secondary winding ( 1 B) and applies this AC to one terminal of a cold-cathode tube ( 201 ), a piezoelectric transformer ( 3 ) which generates a high voltage AC of polarity reverse to the piezoelectric transformer ( 2 ) from the drive voltage generated by the secondary winding ( 1 C), and applies this AC to the other terminal of the cold-cathode tube ( 201 ), and a detection part ( 4 ) which is connected between the secondary windings ( 1 B) and ( 1 C), in which a load current flowing into the cold-cathode tube ( 201 ) flows, and which detects this load current.
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