Curtis 1352 handleiding
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APPENDIX A
Curtis 1352 eXm Manual, June 2021
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pg. 34
APPENDIX A
DESIGN CONSIDERATIONS
ELECTROMAGNETIC COMPATIBILITY (EMC)
Electromagnetic compatibility (EMC) encompasses two areas: emissions and immunity. Emissions
are radio frequency (RF) energy generated by a product. is energy has the potential to interfere
with communications systems such as radio, television, cellular phones, dispatching, aircra, etc.
Immunity is the ability of a product to operate normally in the presence of RF energy. EMC is
ultimately a system design issue. Part of the EMC performance is designed into or inherent in each
component; another part is designed into or inherent in end product characteristics such as shielding,
wiring, and layout; and, nally, a portion is a function of the interactions between all these parts.
e design techniques presented below can enhance EMC performance in products that use Curtis
control products.
Emissions
Signals with high frequency content can produce signicant emissions if connected to a large enough
radiating area (created by long wires spaced far apart). PWM drivers can contribute to RF emissions.
Pulse width modulated square waves with fast rise and fall times are rich in harmonics. (Note: PWM
drivers at 100% do not contribute to emissions.) e impact of these switching waveforms can be
minimized by making the wires from the controller to the load as short as possible and by placing
the load drive and return wires near each other.
For applications requiring very low emissions, the solution may involve enclosing the system,
interconnect wires and loads together in one shielded box. Emissions can also couple to battery
supply leads and circuit wires outside the box, so ferrite beads near the controller may also be
required on these unshielded wires in some applications. It is best to keep the noisy signals as far as
possible from sensitive wires.
Immunity
Immunity to radiated electric elds can be improved either by reducing overall circuit sensitivity
or by keeping undesired signals away from this circuitry. e controller circuitry itself cannot be
made less sensitive, since it must accurately detect and process low level signals from sensors such
as the throttle potentiometer. us immunity is generally achieved by preventing the external RF
energy from coupling into sensitive circuitry. is RF energy can get into the controller circuitry
via conducted paths and radiated paths. Conducted paths are created by the wires connected to the
controller. ese wires act as antennas and the amount of RF energy coupled into them is generally
proportional to their length. e RF voltages and currents induced in each wire are applied to the
controller pin to which the wire is connected.
e Curtis 1352 includes bypass capacitors on the printed circuit board’s sensitive input signals to
reduce the impact of this RF energy on the internal circuitry. In some applications, additional ltering
in the form of ferrite beads may also be required on various wires to achieve desired performance levels.
A full metal enclosure can also improve immunity by shielding the 1352 from outside RF energy.
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Productinformatie
| Merk | Curtis |
| Model | 1352 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5176 MB |
