Actuator drive circuit
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United States of America Patent
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Mar 30, 2004
Grant Date -
Jan 30, 2003
app pub date -
Jul 25, 2002
filing date -
Jul 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the invention, pairs of output transistors are provided. An actuator having an inductance is connected to nodes formed between the pairs of output transistors. A drive circuit for the actuator is arranged such that the actuator is driven by causing a drive current to flow into the inductance. The drive circuit has an overvoltage detection circuit for detecting whether or not a voltage appearing at the nodes of the output transistor pairs exceeds a supply voltage by a first predetermined level and whether or not the voltage becomes lower than a ground level by a second predetermined level. Output transistors connected to the nodes are activated by an output from the overvoltage detection circuit.
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