EUPEC - Europäische Gesellschaft für Leistungshalbleiter mbH & Co KG
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 Over-current Detector
Eupec power semi-conductors are used in power-electronic applications
in the range of 0.5 kW to over 1 GW. A dynamics test of the power
semi-conductors is done at Eupec for final testing of power
semi-conductors. The aim of using this test is to simulate the later
conditions of use of the component. To do this, the test is carried out
at approximately 120 ºC using a test current of up to 2,000 A at a
voltage up to 2,000 V. In order to achieve these conditions, the energy
is drawn from very-high-capacitance capacitor batteries. In the event
of failure of a component, a phase short-circuit occurs and very high
pulse currents flow. These pulse currents load the mechanical
components of the measurement device to the point of destruction.
Therefore, the short circuit current must be detected and limited using
an overcurrent detector. SYS TEC developed and manufactured the
overcurrent detector in accordance with Eupec's technical requirements.
The device analyses, evaluates and reacts to the measured current flows
in the test cycle. The occurrence of an overload is signaled to
external components, so that they can trigger various protective
functions. A micro-controller solution using analog limit value
switching was selected as the hardware. Fast reaction times in the
range of 15 ns to max. 50 ns are achieved using especially fast
comparators in conjunction with a PLD (Programmable Logic Device). The
micro-controller is parameterized using an RS-232 interface. The device
has 2 or 4 different channels for evaluation purposes. An optical fiber
conductor was used for secure and fast signaling of the overcurrent to
the protection device. Complete software development was done at SYS
TEC. In close collaboration with Eupec, optimized solutions were found
for the application. The experiences gained from a multitude of
customer-specific development projects are incorporated into your
projects and ensure proven solutions.
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