DC electronic load offers voltage dropout protection
19 October 2005
Power Electronics / Power Management
The LD300 DC electronic load from Tti (Thurlby Thandar Instruments) has been enhanced by the addition of a low voltage dropout facility. This feature is designed to protect sources such as batteries from damaging levels of discharge by reducing the load current towards zero when the source voltage falls below a user-defined dropout threshold.
The LD300 has maximum input levels of 80 A and 80 V, with a maximum power dissipation of 300 W at 40°C, and has very low internal resistance to allow operation at high currents with low voltage drop. Operation down to 500 mV is possible at currents up to 10 A, rising to 1 V at 40 A, and less than 2 V at 80 A.
There are five different operating modes: constant current, constant voltage, constant power, constant resistance and constant conductance. The value is set by 10-turn controls on the front panel. Alternatively, an external control voltage can be used. Any desired waveform can be applied to simulate complex loads.
Load conditions are displayed using high-accuracy four-digit meters. The voltage of the source can be sensed either internally for convenience or externally for better accuracy. A current monitor output provides a voltage proportional to the current flowing, allowing the behaviour of a source to be viewed on an oscilloscope or external meter.
An internal transient generator can repeatedly switch the load between two different operating levels. The transitions between the levels have a true linear slewing characteristic; with adjustable slew-rate.
The LD300 is fully protected and housed in a compact case measuring 130 x 212 435 mm (half rack width, 3U height) with a mass of 6 kg.
For more information contact Protea Electronics, +27 (0)11 719 5703, c&m@protea.co.za
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