Application Note 1829
2
AN1829.0
March 14, 2013
Block Diagram
The HIP4086DEMO1Z is composed of six major circuits
illustrating the use of several Intersil products.
Bias Supplies
The ISL8560 is a buck regulator with integrated power FETs that
pr5V bias for the microcontroller, dip switches, push
buttons, LEDs, and the current monitor/limit circuits. The
ISL6719 is a linear regulator that provides 12V bias for the
HIP4086 3-phase MOSFET driver. Please refer to the
ISL8560
datasheet or the
ISL6719
datasheet for application information.
HIP4086
The HIP4086, the featured Intersil part, drives 3 bridge pairs of
F540NS power FETS with a PWM frequency of 20KHz. Associated
with the HIP4086 are the necessary support circuits such as the
boot capacitors and boot diodes. Recommended negative
voltage clamping diodes on the xHS pins are also provided.
MicroController
The Hall sensor inputs are decoded by the microcontroller to
provide the appropriate switching sequence signals to the
HIP4086 to drive the six F540NS bridge FETs that are connected
to a 3-phase BLDC motor. In addition to decoding the Hall
sensors, the microcontroller also multiplexes the dip switches
(for switching sequence options), the push buttons (for various
control functions of the motor), and the LED status lights.
The on-board potentiometer (or an optional external pot) is
monitored by the microcontroller to provide a duty cycle to the
motor that is proportional to the tap voltage of the potentiometer
and varies between 0% and 100% duty cycle. This proportional
duty cycle is open loop and is independent of the bridge voltage.
Consequently, any motor voltage between 15V and 60V can be
used with this demo board.
The microcontroller firmware is provided as a reference but the
only support offered by Intersil will be for bug corrections and for
adding more switching sequences. All firmware revisions for this
demo board can be found on the Intersil website. The firmware
revision of your demo board can be determined by referring to
the “Test Mode Setup” on page 24.
Current Sensing/Current Limit
Two ISL28246 low offset, dual op-amps are used for current
monitoring and current limiting. One op-amp is configured as a
differential amplifier for Kelvin connections across the current
sensing resistor. The diff-amp is also biased so that zero bridge
current results with an output voltage that is 1/2 of the +5V bias.
Consequently, positive bridge currents results with a current
monitor signal that is greater than 2.5V (up to ~5V). Negative
bridge currents (that occur with regenerative braking) is less than
2.5V (down to a minimum of ~0V). This ‘”bipolar” analog signal
can be monitored by the microcontroller for purposes, such as
torque control and/or regenerative braking.
The output of the analog differential amplifier is also connected
to two op amps configured as outside window comparators for
pulse-by-pulse current limits for either positive or negative bridge
currents. The OR’ed comparator outputs are sent to the
microcontroller for processing.
FIGURE 2. HIP4086DEMO1Z BLOCK DIAGRAM
HIP4086DEMO1Z
ISL8560
+5V
BUCK
REGULATOR
HIP4086
3-PHASE
MOSFET
DRIVER
ISL6719
12V
REGULATOR
CONTROLLER
LEDS
DIP
SWITCHES
PUSH
BUTTONS
15V TO 60V
3-PHASE
BRIDGE
BLDC
MOTOR
ISL28246
CURRENT
LIMIT
AND
MONITOR
HALL
INPUTS
4
3
6
6
2
3
Содержание HIP4086
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