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Technologies
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Power electronic solutions can provide design expertise, training and knowledge in most
areas of electrical and electronic engineering, such as:
 Digital Signal Processing
Digital Control
Fault Tolerant Systems
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Analogue Electronics
Digital Electronics
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Microcontrollers for Real Time Systems
Power Electronic Devices & Subsystems
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Please take the time to read through the technology descriptions below, which provide a complete
picture of our R & D and training expertise.
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In recent years true power electronics expertise has become a scarce resource in the UK. This
is not the case at PESL, where we can develop all types of power electronic systems ranging
from the milliwatts to the kilowatts.
Typical applications where PESL would develop power electronic systems are AC/DC motor drives;
Battery chargers; High power LED drivers; Active power filters; Uninterruptible
Power Supplies (UPS); Power factor correction and such like.
Modern power electronics is itself comprised of many complex technologies, ranging from
semiconductor devices, to control systems through to power systems. In order to develop
power electronic solutions a complete understanding of all the varied underlying technologies
is required. For this reason we at PESL can provide expertise in virtually all
areas of electrical and electronic engineering.
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Most numerical control, condition monitoring or electronic processes require some form of
Digital Signal Processing (DSP). At PESL we can design and realise all types of digital
systems or digital processes. In conjunction with our microcontroller knowledge we can also
recommend the most appropriate hardware platform to best implement a clients DSP
requirements.
Applications of DSP are active filters; speech recognition;
active tone controls; audio applications and generally anywhere a signal is processed
by a system.
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PESL can design, develop, optimise or tune all types of electrical control systems, from the traditional analogue
to the more modern numerical (digital) types. Most control systems that PESL develop are numerical
in nature and are implemented using similar microcontroller technology to our DSP systems.
Overall the majority of the control systems that we develop for our clients are a combination of
DSP, Microcontroller and Analogue sub-systems.
Typical applications of our control systems are, Pulse Width Modulators (PWM); Active/reactive
Power controllers; Robotics; Temperature controllers; Motor controllers and such like.
All the control systems that PESL develops are optimised for their application and
always have a high degree of stability. PESL will always employ the latest CAD software
to aid in development and improve the performance of our control systems.
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PESL can develop with all variations of microcontroller architectures, including all the associated
hardware through to the firmware and software. For all our applications we fully endorse the
Freescale (Motorola) range of microcontrollers, which range from the simple low cost 8 pin
devices, through to the complex 32-bit floating point units. PESL also develops cost-effective
solutions based around the PIC and dsPIC microcontrollers as well as high performance DSP solutions based
around the TI range of microcontrollers.
Most of the DSP or control developed for our clients is realised using either the Freescale 16-bit
DSP
microcontroller or the dsPIC, which we believe are currently the most versatile and cost effective devices on the market
for DSP/Control applications. For cost sensitive applications, such as single-phase/DC
motor controllers or temperature controllers we recommend the use of the Freescale
68HC08
or PIC range.
For complex vector control or precision numerical processing we recommend the use of
the MPC500
range 32 bit floating point processors or the TI range of 32 bit fixed point DSP microcontrollers .
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In addition to our Microcontroller systems, PESL can also develop ideas using the latest
digital systems technology. Our digital designs have many advantages over their analogue
cousins in certain applications, such as noise immunity and data transmission rates. Many
of our designs are now realised using digital building block IC's, which brings a whole new
level of flexibility to our R & D possibilities.
PESL can develop with combinational logic, latching devices, counters and such like, as well as
complex PLCs. Moreover, we only design our digital systems using the very latest technologies and
development tools, so as to ensure our designs stay 'future proof' for many years.
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At PESL we recognise that the real world is an analogue domain and whenever a digital system wants
to communicate with it, analogue electronics will almost always be involved.
Analogue systems usually take the form of standard building blocks, such as: Instrumentation amplifiers;
measurement amplifiers; input or output buffers; high frequency filtering;
signal amplification; power amplification; signal switching; anti-aliasing filtering and so on.
For certain control applications it is also more effective to develop with continuous
(analogue), rather than discrete (digital) hardware.
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When designing systems for our clients, whether digital or analogue, high or low power, the
ability of the system to respond correctly during unexpected hardware or software failure is
always paramount.
At PESL we develop our systems to have specific levels of fault tolerance depending upon the
application. An example of fault tolerance is the ability of a design to continue
to operate, even in the event of a sudden power failure. Many of our software based
microcontroller systems can be designed with high levels of fault tolerance. For example
all software instructions can be mirrored, where every operation is performed on two or more
duplicate microcontroller systems. Therefore if one system fails the other can take over.
Our clients are always safe in the knowledge that PESL develops systems, which have been carefully
designed to ensure the fault tolerance, redundancy and system costs have all been optimised for the
application in hand.
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