Load driving apparatus
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United States of America Patent
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-
Oct 15, 2019
Grant Date -
Mar 15, 2018
app pub date -
Sep 12, 2017
filing date -
Sep 15, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A load driving apparatus supplies an electric power to a load via a full-bridge circuit. The load driving apparatus detects a load current by a current sensing resistor. A controller in the load driving apparatus generates a drive signal by switching between a first reference circuit outputting a first reference signal with a first reference cycle and a second reference signal outputting a second reference signal with a second reference cycle. A calculator in the load driving apparatus is used to supply a drive signal to the full-bridge circuit for supplying power to the load. When the controller 13 detects that the value of the load current is not reaching predetermined current threshold values, within either of the first reference cycle or the second reference cycle due to temperature fluctuations, the controller switches to either the first reference circuit or the second reference circuit to stabilize the value of the load current around an average value.
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