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LiAM User's Manual
linearity are avoided/bypassed (since they would not be included in the computation
of the calibration curves).
This LIAM 6005 power unit, rated at 300W output power, is based on the
cascade of a linear three-phase AC/DC stage and a linear current-controlled output
stage. A particular technique allows for automatic rail switching – i.e. voltage rails
switch between different voltage levels in order to optimize efficiency – an also a
dedicated automatic load recognition procedure was implemented (see dedicated
sections for further details).
Auxiliary AC/DC and DC/DC power supplies are also linear in order to avoid
any switching noise that could be generated by the device. Linear transformers are
optimized to reduce magnetic flux leakage that could cause EMI (Electro-Magnetic
Interference).
Control of the output current is made by a high-resolution and low-drift
Digital-to-Analog converter (DAC) that sets a resolution of about 160µA on the
module output current setpoint.
Current sensing is performed with a particular array of precise shunt resistors
that guarantees extremely low temperature drifts and excellent linearity.
External configurable interlocks are also provided on the LiAM 6005 rear
panel in order to have the power supply connected, if needed, to some external
devices/safety circuitries. A solid-state status output is also available on the rear panel
of the device: it allows the monitoring of the module output stage (enabled/disabled)
by opening/closing a contact.
A load energy protection/damping circuit is implemented in order to protect
the power supply and the load from over-voltage conditions. This feature is necessary
when having large current in large inductive loads since the energy that gets stored
into the load can be of a large entity and it could cause problems and damages.
A monitor output – rated at ±10V for a ±5A output current – is also present on
the rear panel of the power supply on a BNC connector and it can be used for external
monitoring purposes.
The cooling of the LiAM 6005, a critical task when using linear power
supplies, is performed by speed-regulated fan forced-air convection with a front-to-
rear direction.
Other features of the LiAM power units, as remote firmware upgrade, short-
circuit stability, etc. are further on described in this manual.
11
Introduction
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