Vehicle-mounted electronic control device
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United States of America Patent
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Mar 31, 2015
Grant Date -
Nov 22, 2012
app pub date -
Jan 5, 2012
filing date -
May 16, 2011
priority date (Note) -
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Abstract
In a vehicle-mounted electronic control device having a switching power supply in which a switching element is controlled to obtain a predetermined intermediate voltage Va stepped down from a vehicle-mounted battery, and to which a downstream side coil, a flywheel diode, and an output capacitor are connected to suppress a pulsating voltage, a circuit for suppressing reverse conduction for the switching element is provided in order to prevent that the switching element is reversely conducted and thus a charging voltage of the output capacitor is abnormally lowered when a power supply voltage Vb of the vehicle-mounted battery is abnormally lowered.
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