Four Nch-FETs are drives by half-bridge FET driver ICs (LT1158). A motor can be controlled by PWM with less than 100 kHz.
When the battery voltage is lower than abount 6V, the FET drivers are disable.
Nch-FETs IRLR8713 (max 100A) are used.
Signal level from microcontroller should be 5V.
Caution Current of the circuit is about 1 mA even in idle time.
A |
B |
Vbat |
Action |
X |
X |
<6V |
FREE |
L |
L |
>6V |
FREE |
H |
L |
>6V |
REVERSE |
L |
H |
>6V |
NORMAL |
H |
H |
>6V |
BRAKE |