This Digital Interface system uses a proprietary bus structure
to provide a very low noise, highly stable control for up to 64
of our Precision High Voltage power supply modules, both unipolar,
and reversible, via a single USB port.
A simple ribbon cable connection scheme to a master interface and
a 24V power supply enables a safe, flexible, multichannel high voltage
system to be quickly and easily configured, and reconfigured, for
such applications as Mass Spectrometers, Electron Microscopes, &
Surface Science Equipment
A fibre-optic data path is also available for high voltage isolation,
for Electron Gun and Ion Gun applications, where control of a group
of power supplies elevated to many kV is easily configured.
Safety is paramount: power is removed from a module, the moment
its comms path is broken.
The Digital Control Interface PCB fits directly
on the Molex i/p connector of the HP series
High Voltage power supply, and is contained within the envelope
of the PSU. A 15Way ribbon cable from the USB receiver and 24V power
supply, provides both the power and digital control signals, and
can be readily daisy-chained, for ease of inter-wiring.
Digital On/Off control of supply to each PSU, provides removal
of the ‘source of energy’.
In the default mode, if the USB connection powers down, or is
unplugged, then the high voltage enable bus control line goes
low and the high voltage supplies are turned off. This can be
disabled by a link in the USB receiver, so that the modules remain
at their set levels.
If HV enable is forced low externally by an open collector transistor,
then the high voltage supplies are turned off.
The optical link sends idle packets so if these packets are not
seen for 2 frames, then the high voltage enable is turned off,
and all isolated supplies will be turned off.