Abstract:
In multiphase driving systems of electric motors in a switching mode employing distinct integrated half-bridge output stages, the use of multiple external components for each integrated half-bridge stage to implement functions of adjustment of the switching dead-time and of disabling/enabling of the half-bridge stage can be avoided and an improved matching obtained by using single external components connected in common to the dedicated pins of all the distinct integrated half-bridge output stages. This is achieved by duplicating the disabling comparator, respectfully for the power transistor of the pull-up branch and for the power transistor of the pull-down branch in each integrated half-bridge stage.
Abstract:
The DC-DC converter (1') comprises a current error amplifier (34') and a voltage error amplifier (30) connected in parallel to control the charging phase of the battery (18), during which a charging current (IBAT) is supplied to the battery (18) to bring the voltage (VBAT) of the battery (18) gradually up to a full charge voltage (VFIN); a charging interruption stage (QA, QB, MS5) for interrupting the charging phase before the voltage (VBAT) of the battery has reached the full charge voltage (VFIN); and an activation stage (104, 106) for activating the charging interruption stage (QA, QB, MS5) when the full charge voltage (VFIN) is close to the supply potential (VCC) at which the supply line (6) of the current error amplifier (34') is set.
Abstract:
The DC-DC converter (1') comprises a current error amplifier (32') and a voltage error amplifier (42') connected in parallel to control the charging of the battery (18) and a gradual turning off circuit (44', 60) for turning off gradually the current error amplifier (32') in a battery charging end phase. In this way, the DC-DC converter is able to supply to the battery (18) a battery charging current that remains constant up until the battery full charge voltage is reached.