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参数资料
| 型号： | IRPT2060A |
| 文件页数： | 11/12页 |
| 文件大小： | 126K |
| 代理商： | IRPT2060A |
page 11
IRPT2051
Functional Information
CAUTION
:
All control logic is referenced to the negative power bus,
which is live with respect to earth/ground.
Capacitor Soft Charge
A dc bus capacitor is connected to the rectifier bridge output
through an NTC. At power-up, the NTC limits the maximum
inrush current to the rated peak input current, though normal line
impedance will impact the inrush insignificantly. During normal
operation, current through the NTC reduces its resistance, hence
reducing its losses. In the event of a brief power loss, the NTC
will not limit the recharge of the bus because its temperature will
not have time to reduce back to ambient.
System Power Supply
A buck converter designed with the IR2152 self-oscillating
half-bridge driver generates V
CC
(15V) and V
D
(5V) for drive
and protection circuits. It draws its power from the midpoint of
the dc bus, which si regulated to half of the voltage. Both V
CC
and V
D
are available at the control connector toupply micropro-
cessor controls. Rated output current is the sum of I
CC
and I
D
.
Floating power supplies for high side devices are derived
through the bootstrap technique, simplifying power supply re-
quirements.
Gate Drive Circuits
Gate drive for the inverter is implemented with an IR2233
monolithig 3-phase HVIC driver. An under voltage circuit
monitors the local power supply voltage. It will set the FAULT
and inhibit the PWM output in the event of a low power condi-
tion to protect the IGBTs from excessive power loss due to low
gate drive.
A short circuit buffer power supply counters the voltage drop
across the shunt in the negative dc bus, allowing the device to
have nominal gate voltage during short circuit. This will main-
tain the current to a detectable level.
The brake IGBT is generally switched at low frequency, so a
simple bipolar gate drive circuit is used to drive it.
System Protections
Short circuit
is monitored through a shunt in the negative
bus, which detects phase-to-phase and phase-to-earth short cir-
cuits (when current flows from earth to negative bus). The
voltage drop across teh shunt is compared to a pre-set limit and
when the current exceeds the rated nominal value, this protection
is activated. The shunt signal is available to the user on the con-
trol interface as I
FB
. Since this is the same node that is used by
this protection circuit, any external connection should be done
through a high impedance buffer stage.
Earth/ground fault
from positive bus to earth is detected to
the shunt in the positive bus and an opto-coupler. When fault
current exceeds the rated nominal value, this protection is acti-
vated.
Over temperature
is measured by a thermistor mounted
close to the inverter section in the power module. When the sub-
strate temperature exceeds the nominal rated temperature, this
protection is activated.
Over voltage
is detected by comparing attenuated dc bus
voltage with a pre-set reference. When the bus voltage exceeds
the nominal rated value, this protection is activated. The attenu-
ated dc bus voltage is available to the user on the control
interface as V
FB
. Since this is the same node that is compared to
the reference, any external connections should be done through a
high impedance buffer stage.
If any of the protection features are activated, the TRIP signal
goes high activating the internal latch of the IR2233. This turns
off all gate outputs to the inverter and acknowledges the FAULT
to the controller.
Trip Reset
The FAULT signal can be removed by pulling down the RE-
SET pin for 2 μs. This should be done only after all inputs,
IN1...IN6, are inactive. The system protections cannot be dis-
abled by tying this pin to N because the fault logic takes
precedence over the reset.
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相关代理商/技术参数 |
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| IRPT2060C | 制造商:IRF 制造商全称:International Rectifier 功能描述:Power Module for 3 hp Motor Drives |
| IRPT2060D | 制造商:IRF 制造商全称:International Rectifier 功能描述:Power Module for 3 hp Motor Drives |
| IRPT2061A | 制造商:IRF 制造商全称:International Rectifier 功能描述:Power Module for 1.5 hp Motor Drives |
| IRPT2062 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| IRPT2062A | 制造商:IRF 制造商全称:International Rectifier 功能描述:Power Module for 3 hp Motor Drives |
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