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Cautions on Use Quality is our message

61


Chapter 6

Cautions on Use


Contents
Page


1. Main Power Source ..........................................................................................6-2
2. Control Power Source ......................................................................................6-3
3. Protection Functions.........................................................................................6-4
4. Power Cycling Capability..................................................................................6-6
5. Other ................................................................................................................6-6




Chapter 6 Precautions for Use

6-2
1

Main Power Source
1.1 Voltage range
1.1.1 600 V system IPMs
The main power source should not exceed 500 V (= V
DC
(surge)) between the P and N main terminals.
The voltage between the collector and emitter main terminals (= VCES) should not exceed 600 V (=
absolute max. rated voltage).
Surge voltage occurs in the wiring inductance inside the IPM due to di/dt during switching, but the
product is designed so that 600 V is not exceeded between the collector and emitter main terminals
when the main power source is used at V
DC
(surge) or lower between the P and N main terminals.
In order for the maximum surge voltage at the time of switching not to exceed the rated voltage, keep
the connecting wires between the IPM and the embedded product short and install a snubber close to
the P and N terminals.

1.1.2 1200 V system IPMs
The main power source should not exceed 1000 V (= V
DC
(surge)) between the P and N main terminals.
The voltage between the collector and emitter main terminals (= VCES) should not exceed 1200 V (=
absolute max. rated voltage).
Surge voltage occurs in the wiring inductance inside the IPM due to di/dt during switching, but the
product is designed so that 1200 V is not exceeded close to the chip when the main power source is
used at V
DC
(surge) or lower between the P and N main terminals.
In order for the maximum surge voltage at the time of switching not to exceed the rated voltage, keep
the connecting wires between the IPM and the embedded product short and install a snubber close to
the P and N terminals.

1.2 External noise
Countermeasures have been taken against external noise within the IPM, but faulty operation may
possibly occur depending on the type and intensity of the noise.

Please take sufficient countermeasures against noise entering the IPM.


1.2.1 Noise from outside the equipment
Apply a noise filter on the AC line, isolate the ground and so on.
When required, add capacitors of 100 pF or less between all phase signal inputs and signal GND.
Install arresters against lightning surges, etc.
Chapter 6 Precautions for Use

6-3
1.2.2 Noise from within the equipment
Outside the rectifier: Implement the same countermeasures as the above.
Inside the rectifier: Apply snubber circuits on the PN lines.
(In case of multiple inverters connected to one rectifier converter, etc.)

1.2.3 Noise from the output terminals
Take external countermeasures so that contactor switching surges and so on do not enter.

2

Control Power Source
2.1 Voltage range
The drive circuit shows stable operation when the control power source voltage is in the range of 13.5 to
16.5 V.
Operation with a value as close to 15 V as possible is recommended.
When the control power source voltage is below 13.5 V, the loss will increase and noise will show a
tendency to decrease.
Also, the protection performance will shift, so that the protection functions may not be sufficient and chip
damage may occur.
When the control power source voltage drops below 13.5 V, dropping down to VUV or lower, the
undervoltage protection function (UV) operates.
When the control power source voltage recovers to VUV + VH, UV is automatically released.
When the control power source voltage exceeds 16.5 V, the loss decreases and noise shows a
tendency to increase.
Also, the protection performance will shift, so that the protection functions may not be sufficient and chip
damage may occur.
When the control power source voltage is below 0 V (reverse bias) or exceeds 20 V, the drive circuit
and/or the main chip may be damaged. Never apply these voltages.

2.2 Voltage ripple
The recommended voltage range of 13.5 to 16.5 V includes the voltage ripple of Vcc.
During the manufacture of the control power source, be sure to keep the voltage ripple sufficiently low.
Also be sure to keep noise superimposed on the power source sufficiently low.
Design the control power source so as to keep dv/dt at 5 V/µs or lower.

2.3 Power source start-up sequence
Apply the main power source after confirming that Vcc is in the recommended voltage range.
If the main power source is applied before the recommended voltage is reached, the chip may be
destroyed (worst-case scenario). Chapter 6 Precautions for Use

6-4
2.4 Alarm at the time of power source start-up and shutdown
At the time of power source start-up, an alarm is output at the UV protection function operation level
voltage.
Recovery is made when the protection release level voltage is reached, but as the alarm will not be
released as long as an ON signal is input, appropriate measures must be taken on the drive circuit side.
As there is also alarm output at the time of power source shutdown, similar measures are required.

2.5 Precautions upon control circuit design
Design with sufficient margin, taking the current consumption specification (Icc) for the drive circuit into
consideration.
Make the wiring between the input terminals of the IPM and the photocoupler as short as possible, and
use a pattern layout with a small stray capacitance for the primary side and the secondary side of the
photocoupler.
Install a capacitor as close as possible between Vcc and GND in the case of a high-speed photocoupler.
For a high-speed photocoupler, use a high CMR type in which tpHL, tpLH 0.8 µs.
For the alarm output circuit, use a low-speed photocoupler type in which CTR 100%.
Use four isolated power sources for the control power source Vcc. Also use a design with suppressed
voltage fluctuations.
When a capacitor is connected between the input terminals and GND, note that the response time in
regard to an input signal on the primary side of the photocoupler becomes longer.
Design the primary-side current of the photocoupler with sufficient margin taking the CTR of the
photocoupler being used into consideration.

3

Protection
Functions
As the built-in protection functions and the presence or absence of alarm output differ according to the
package and the model, confirm the protection functions of your IPM referring to the "List of IPM built-in
functions" in chapter 3.


3.1 Protection operations in general
3.1.1 Range of protection
The protection functions included in the IPM are designed for non-repetitive abnormal phenomena.
Do not apply constant stress that exceeds the rating.

3.1.2 Countermeasures for alarm output
If an alarm is output, stop the input signal into the IPM immediately to stop the equipment.
The IPM protection functions protect against abnormal phenomena, but they cannot remove the causes
of the abnormalities. After stopping the equipment, restart it after you have removed the cause of the
abnormality. Chapter 6 Precautions for Use

6-5
3.2 Precautions for the protection functions
3.2.1 Overcurrent
The overcurrent protection function (OC) executes a soft shutdown of the IGBT and outputs an alarm
when the overcurrent continues in excess of the insensitive time (tdoc).
Accordingly, OC does not operate when the overcurrent is removed within the tdoc period.
In P619, the current is detected on the N-line, so there is no OC for the upper arm.

3.2.2 Starting with load short-circuit
The OC has an insensitive time (tdoc) of approximately 5 to 10 µs. If the input signal pulse width is
shorter than this, the OC does not operate.
If an input signal pulse width of tdoc or less continues when starting with the load shorted, short circuits
occur continuously and the chip temperature of the IGBT rises rapidly.
In such a case, the rise of the case temperature does not follow the rise of the chip temperature and the
case temperature overheating protection function (TcOH) does not operate. Normally the chip
temperature overheating protection function (TjOH) operates and provides protection, but as TjOH also
has a delay of approximately 1 ms, de