Microchip Technology DM183021 사용자 설명서
Using dsPIC DSCs to Run a Sensorless BLDC Motor
© 2006 Microchip Technology Inc.
DS51554B-page 29
7.4
USING THE PICDEM MC LV DEVELOPMENT BOARD FOR
HIGHER MOTOR VOLTAGE
HIGHER MOTOR VOLTAGE
The PICDEM MC LV Development Board can be used to drive a motor at a voltage
higher than 24V, but not exceeding 36V. The new high voltage can be supplied to the
system at the Plus (+) and Minus (–) terminals on J9. For the sensorless algorithm to
work, the user will have to modify the resistor pairs to drive the same full-scale (2.4V)
and zero-cross (1.2V) voltages (see Section 7.3 “Sensorless Control of a BLDC
Motor”). Do not exceed the input voltage of the 15V regulator (VR2), which is typically
about 36V. Since the voltage drop across VR2 will increase substantially, make sure to
provide additional heat sinking for VR2.
higher than 24V, but not exceeding 36V. The new high voltage can be supplied to the
system at the Plus (+) and Minus (–) terminals on J9. For the sensorless algorithm to
work, the user will have to modify the resistor pairs to drive the same full-scale (2.4V)
and zero-cross (1.2V) voltages (see Section 7.3 “Sensorless Control of a BLDC
Motor”). Do not exceed the input voltage of the 15V regulator (VR2), which is typically
about 36V. Since the voltage drop across VR2 will increase substantially, make sure to
provide additional heat sinking for VR2.
7.5
USING THE PICDEM MC LV DEVELOPMENT BOARD FOR
LOWER MOTOR VOLTAGE
LOWER MOTOR VOLTAGE
The PICDEM MC LV Development Board can be used to drive a motor at a voltage
lower than 24V, but not below 10V. This voltage can be supplied to the system at the
Plus (+) and Minus (–) terminals on J9. Since the 15V regulator will no longer be used
to drive the MOSFET drivers, J18 should be provided with a shorting jumper. This
jumper connects the Plus (+) voltage directly to the MOSFET drivers. For the sensor-
less algorithm to work, the user will have to modify the resistor pairs to derive the same
full-scale (2.4V) and zero-crossing (1.2V) voltages (see Section 7.3 “Sensorless
Control of a BLDC Motor”). Make sure not to exceed the maximum input voltage of
the MOSFET drivers, U6, U8 and U9. This voltage is typically 20V.
lower than 24V, but not below 10V. This voltage can be supplied to the system at the
Plus (+) and Minus (–) terminals on J9. Since the 15V regulator will no longer be used
to drive the MOSFET drivers, J18 should be provided with a shorting jumper. This
jumper connects the Plus (+) voltage directly to the MOSFET drivers. For the sensor-
less algorithm to work, the user will have to modify the resistor pairs to derive the same
full-scale (2.4V) and zero-crossing (1.2V) voltages (see Section 7.3 “Sensorless
Control of a BLDC Motor”). Make sure not to exceed the maximum input voltage of
the MOSFET drivers, U6, U8 and U9. This voltage is typically 20V.