Power Voltage Variable Control System

SYSTEM

POWER VOLTAGE VARIABLE CONTROL SYSTEM : System Description


SYSTEM DIAGRAM







DESCRIPTION

The power voltage variable control system reduces the electric power consumption from the Li-ion battery by varying the DC/DC converter output in a range from 13 V to 15 V according to the use status of electric equipment and the 12V battery status.

CONTROL DESCRIPTION

The battery current sensor (with battery temperature sensor) measures the battery charge/discharge current and the battery ambient temperature.
VCM judges the battery status and the use status of electric equipment based on those signals, determines a target output voltage, and transmits a target DC/DC output power signal to the DC/DC converter.
The DC/DC converter adjusts the output voltage to the target power generation voltage based on the received target DC/DC output power signal.
In addition, when there is no power voltage signal or when some error is occurs in the variable voltage control system, the DC/DC converter outputs 14 V.