Load driving control apparatus
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United States of America Patent
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Aug 21, 2018
Grant Date -
Jan 25, 2018
app pub date -
Apr 27, 2017
filing date -
Jul 19, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A load driving control apparatus calculates current slopes in an on-period and an off-period in one PWM cycle period, respectively, by using actual currents at a start time point and an end time point of the PWM cycle period as well as two sets of data, as data including a duty ratio corresponding to the actual current values. The data is so determined that the actual current data value of predetermined one of the start time point and the end time point is within a learning area. The duty ratio is calculated based on a difference between a target current value and the actual current value until calculation of the current slopes and is completed. The duty ratio is calculated based on the current slopes, the actual current value at start time point and a target current value after the calculation of the current slopes is completed. Since an actual current change characteristic is calculated based on the actual current values and the duty ratio is calculated based on the current change characteristic, robustness is enhanced.
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