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参数资料
| 型号： | IRPT3054A |
| 厂商： | International Rectifier |
| 英文描述： | Power Module for 5 hp Motor Drives |
| 中文描述： | 电机驱动电源模块为5马力 |
| 文件页数： | 10/12页 |
| 文件大小： | 227K |
| 代理商： | IRPT3054A |
page 10
IRPT3054A
Heat Sink Requirements
Figure 3 shows the thermal resistance of the heat sink required
for various output power levels and pulse-width-modulated
(PWM) switching frequencies. Maximum total losses of the unit
are also shown. This data is based on the following key
operating conditions:
The maximum continuous combined losses of the rectifier
and inverter occur at full pulse-width-modulation. These
losses set the maximum continuous operating temperature
of the heat sink.
The maximum combined losses of the rectifier and inverter
at full pulse-width modulation under overload set the
increment temperature rise of the heat sink during overload.
The minimum output frequency at which full load current
is to be delivered, sets the peak IGBT junction temperature.
At low frequency, IGBT junction temperature tends to
follow the instantaneous fluctuations of the output current.
Thus, peak junction temperature rise increases as output
frequency decreases.
Functional Information
Over-Temperature Protection
Over-temperature can be detected using the NTC thermistor
included in the power module for thermal sensing. A protection
circuit that initiates a shutdown if the temperature of the IMS
exceeds a set level can be implemented. The nominal resistance
vs. temperature characteristic of the thermistor is given in
figure 5.
Voltage Rise During Braking
The motor will feed energy back to the DC link during
regenerative braking, forcing the bus voltage to rise above the
level defined by the input voltage. Deceleration of the motor
must be controlled by appropriate PWM control to keep the DC
bus voltage within the rated maximum value. For high inertial
loads, or for very fast deceleration rates, this can be achieved by
connecting an external braking resistor across P and BR and
controlling the brake IGBT switching when the bus voltage
exceeds the allowable limit.
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