Brushless Motor Control Board
18V/400W high-efficiency (98%), non-inductive, with locked-rotor current limiting function, compact for brushless DC motor drives in power tools
18A RMS driver for three-phase brushless DC (BLDC) motors in power tools powered by 5 lithium-ion batteries (maximum voltage 21V). This design is a compact 45 x 50 mm driver that enables sensor-based trapezoidal control. The design uses a discrete compact MOSFET-based three-phase inverter that provides 18A RMS continuous (60A peak for 1 second) winding current without the need for any external cooling devices or heat sinks. The slew rate control of the gate driver and charge pump ensures maximum inverter efficiency (>98%, 18V DC) and best EMI performance. The cycle-by-cycle overcurrent protection function prevents large stall currents in the power stage, and the board can operate at ambient temperatures up to 55°C. The small form factor supports flexible board placement, high efficiency makes the battery last longer, and the 60A peak current capacity can provide high instantaneous peak torque in power tools.
- Operating voltage range is 15V to 21V (5 lithium-ion batteries) and has RMS continuous (60A peak for 1 second) winding current up to 18A, no heat sink or airflow required
- PCB is compact: 45mm x 50mm
- Optimal inverter efficiency (>97%, 10.8V) and EMI performance are achieved by using low RDS_ON NexFET and slew rate control of gate driver and charge pump function
- Cycle-by-cycle overcurrent protection, response time is less than 1us, short circuit latch protection breakdown protection, under-voltage protection, overtemperature protection, and rotor stall protection are provided through VDS sensing
- Operating voltage range is 15V to 21V (5 lithium-ion batteries) and has RMS continuous (60A peak for 1 second) winding current up to 18A, no heat sink or airflow required
- PCB is compact: 45mm x 50mm
- Optimal inverter efficiency (>97%, 10.8V) and EMI performance are achieved by using low RDS_ON NexFET and slew rate control of gate driver and charge pump function
- Cycle-by-cycle overcurrent protection, response time is less than 1us, short circuit latch protection breakdown protection, under-voltage protection, overtemperature protection, and rotor stall protection are provided through VDS sensing
- Lawnmower
- Mowing robot
- Sweeping robot
- Wireless handheld garden tools
- Wireless power tools
- Wireless vacuum cleaner
- Electrical pumps and fans
- Appliance: Compressor