4-quadrant power supplies or 4-quadrant amplifiers are instruments that are capable to provide positive and negative output voltages as well as positive and negative output currents.
Laboratory power supplies are usually only single quadrant power sources. They are only able to deliver power with one single polarity, i.e. these instruments only work in one quadrant of the output voltage/ current diagram. Common amplifiers deliver voltages with both polarities, but are generally unable to absorb power values in a range comparable to that which they are able to deliver. They therefore mainly work as two-quadrant devices.
The TOE 7620 series of 4-quadrant power supplies is able to work as a power sink as well as a power source with equal values of delivered or absorbed power. Thus a TOE 7620 series power supply is bipolar voltage and current source, and a current sink in one instrument and can replace a combination of single components. Frequent problems with the interaction of individual components and unexpected oscillations now belong to the past.
Selectable input voltage range
The input voltage range can be set to a range of ±5 V or ±10 V. Therefore no further external adaptation of the control voltage is necessary.
Variable DC offset
The DC offest voltage at the output can be adjusted to any value within the rated output voltage range. The external control voltage will be amplified and superimposed to the DC offset. This way the ripple voltage in an on-board supply system can easily be simulated.
Adjustable output impedance
The output impedance is adjustable in the range from 0 to 0.5 Urated / Irated.
Short-time load current
All 4-quadrant power supplies of the TOE 7620 series can be equipped with the TOE 7620/103 option to deliver three times the rated current for approx. 3 ms.
A convenient feature is the output switch-off which allows immediate shut down of the output voltage and current when in the “Output OFF“ position. Additionally the output will be isolated!