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PDF AN4869 Data sheet ( Hoja de datos )
| Número de pieza | AN4869 | |
| Descripción | Power Assemblies | |
| Fabricantes | Dynex Semiconductor | |
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Replaces September 2000 version, AN4869-3.0
ANxxxx Application Note
AN4869
Formulating Technical Enquiries
Application Note
AN4869-3.1 July 2002
If you have just written down or are about to write down a
technical enquiry for thyristors, rectifiers or heatsink assemblies
then please spare a few minutes to read through the following
notes. This should help to minimise the response time to the
enquiry.
The following notes are aimed specifically at converter thyristor
and rectifier diode applications but the basic approach applies to
other power semiconductor devices.
For many applications design engineers will find most of the
technical information they need in the device data sheets.
However, for special applications or where technical help is
needed a technical enquiry may be formulated and submitted to
us. Below is a checklist which should help you, the enquirer, to
include as much relevant information as possible in your enquiry.
This approach may avoid the need for us to ask you for
supplementary information .
Note, it is not possible to cover every possible application so that
the check list cannot be considered as comprehensive. Minimum
information required by us to formulate a reply is covered
by those items printed in ‘bold’.
In formulating your enquiry try to consider particularly the duty on
the diode and/or thyristor. For this, voltage and current waveforms
are particularly important and, unless the application is very
standard, should always be given. If waveforms are given, state
whether they are real or computer modelled (eg from SPICE).
Clarify if a quote for either parts or assemblies is
required. If YES, is requirement for devices only, or devices on
heatsinks, or complete assemblies with snubbers and possibly
fuses? Also, give quantities and delivery required.
1. WHAT TYPE OF APPLICATION?
DC motor control (eg phase controlled bridge or chopper).
AC motor control (eg variable frequency inverter).
Soft start circuit for ac motors.
AC controller (eg heating control, resistance welding).
Rectifying bridge or battery charger.
Power factor correction.
Crowbar.
Capacitor discharge.
Other.
2. POWER SUPPLY DETAILS
DC - give nominal voltage and current capability requirements,
with tolerances, also prospective short circuit current and/or
source inductance.
AC - remarks, as for DC but also state whether 1, 3 or 6 phase
with connection type,eg star,delta.
Frequency.
Voltage transients, if known.
3. LOAD DETAILS
Resistive? Inductive (give power factor).
Motor (what type?).
Capacitive (give power factor).
Current - include details, as appropriate, of Ipeak, IT(AV), di/dt (turn-
on and turn-off), frequency ( including pwm chopping frequency).
Include any details of overload duty and time, as well as repetitive
load duty cycle.
4. SEMICONDUCTOR EQUIPMENT DETAILS
It is assumed that this equipment is the control element between
supply and load. It contains the semiconductor devices or
assemblies which are the subject of the enquiry.
Configuration required? - eg bridge, chopper, ac controller.
What ratio is required between device voltage rating and
supply voltage transient value? Typical ratios vary between
1.5 and 3.0. This ratio, or safety factor, is price sensitive so that
the final choice must be for the customer.
Give details of the current in and the voltage across the
semiconductor device (supply waveforms, if appropriate).
Also duty cycle.
Thyristor gate trigger pulse to be used:
It is assumed that the enquirer will be using his own gate
trigger source.
Give values of current and time indicated on the diagram
below, particularly Ig peak, which can be taken as the gate
driver short circuit current. Rate of rise of gate current is
also important.
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