Car window control circuit

Two half-bridge intelligent power driver chips BTS 7960B are combined into a full-bridge driver
to drive the DC motor to rotate to raise or lower the window. BTS7960B is a high-current half-bridge integrated chip used in motor driving.
It has a P-channel high-side MOSFET , an N-channel low-side MOSFET and a driver 1C. P-channel high-side switching eliminates
the need for a charge pump, thereby reducing electromagnetic interference (EMI). The integrated driver IC has logic level input, current diagnosis, slope adjustment,
dead time generation and over-temperature, over-voltage, under-voltage, over-current and short-circuit protection functions.
    The typical on-state resistance value of BTS7960B is 16mfl, and the driving current can reach 4.3A, so even in the cold winter,
the safe start of the car window can still be ensured. Adjusting the size of the external resistor connected to the SR pin can adjust the MOS tube turn-on and turn-off time, and has the function of preventing electromagnetic interference. The 1S pin
is the current sense output pin. The INH pin is the enable pin, and the IN pin is used to determine which MOSFET is turned on. When lN-1 and INH-
l. The high-side MOSFET is turned on and outputs high
level. When IN=O and INH-1, the low-side
MOSFET is turned on and outputs low level. It is controlled by the 16-bit
microcontroller XC164CS. The switching action of BTS7960B
is used to regularly
monitor the system status. Receive appropriate fault feedback signals and exchange fault information and button control information with the central body controller
through the vehicle network (CAN bus) , thereby displaying fault content on the user interface in a timely manner and performing real-time monitoring of the power windows. Control I is to avoid current spikes when the window motor starts. The soft start function is realized by controlling the pulse width modulation (PWM) signal with a frequency of 20kHz on the lower arm switch tube.