초록 ▼

A drive circuit for driving a piezoelectric element includes a transformer having a primary winding connected to a power source and a secondary winding connected to the piezoelectric element, a primary semiconductor element circuit connected to the primary winding for switching the current through t

A drive circuit for driving a piezoelectric element includes a transformer having a primary winding connected to a power source and a secondary winding connected to the piezoelectric element, a primary semiconductor element circuit connected to the primary winding for switching the current through the primary winding, and a secondary semiconductor element circuit connected to the secondary winding for switching the current through the secondary winding. A failure detection unit responsive to the potential at a predetermined point of the drive circuit is provided for detecting a failure in the piezoelectric apparatus and outputting a failure detection signal.

대표청구항 ▼

A device for detecting failures, including an open-circuit state failure and a short-circuit state failure, in a piezoelectric apparatus, the device comprising: a piezoelectric element; a drive circuit driving said piezoelectric element including a switching element, which switches a current to be s

A device for detecting failures, including an open-circuit state failure and a short-circuit state failure, in a piezoelectric apparatus, the device comprising: a piezoelectric element; a drive circuit driving said piezoelectric element including a switching element, which switches a current to be supplied to said piezoelectric element; and failure detection means responsive to a potential at a predetermined point of said drive circuit for detecting said failures in said piezoelectric apparatus and for outputting a failure detection signal, the failures of the piezoelectric apparatus including an open-circuit state failure and a short-circuit state failure being detected and an alarm being delivered to warn an occurrence of a failure based on the detection of the potential at the predetermined point of said drive circuit.