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POWER TECHNOLOGIES
TTi laboratory power supplies use both linear and switch-mode technologies in order to optimise performance and value for money.
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Linear Regulation
Pure linear regulation still provides the lowest output noise and best transient response. The disadvantage is greater physical size and weight for a given power, together with higher heat output.
Pure linear regulation is used on the EL, EL-R, PL, PLH, QL and TS series, as well as on the EB2025T.
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Mixed-mode regulation
For higher power levels, TTi have developed a technology that uses switch-mode pre-regulation and linear final regulation. This technique combines exceptional efficiency with noise levels that are close to that of pure linears.
Mixed-mode regulation is used in the EX, EX-R and TSX series.
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PowerFlex regulation
The TTi PowerFlex system uses a modified form of mixed-mode regulation
to provide higher levels of current when the voltage is set to lower
values. PowerFlex design gives variable voltage and
current combinations within a maximum power range, enabling the PSU to
meet a much wider range of needs.
PowerFlex regulation is used on the CPX and QPX series. |
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PRECISION
Measurement and control
With the exception of the ‘basic’ model (EB2025T), all TTi laboratory power supplies offer high accuracy digital meters together with high resolution controls and dc output switches.
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Standard models
The original EL and EX series incorporate three digit meters for both voltage and current. This provides a level of accuracy and resolution sufficient for many purposes.
Note that most EL and EX models have now been replaced with EL-R and
EX-R equivalents.
Separate coarse and fine voltage controls allow rapid and precise adjustment whilst a semi-logarithmic current control provides increased setting resolution at lower currents. |
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Precision models
The EL-R, EX-R, PL, PLH, TS, TSX and CPX series offer a higher level of precision by incorporating four digit meters and remote sense terminals.
Four digit meters provide higher resolution and accuracy. Remote sense enables the PSU to regulate the voltage directly at the load thus eliminating the effect of connection lead resistance.
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S-Lock and V-Span
The New PL series, PLH series and CPX400D incorporate true analog
controls that can be locked at the touch of a button. This
transfers control to a high resolution DAC ensuring stability and safety
from accidental changes.
V-Span enables to 300 degree range of the voltage control potentiometer
to be set to cover any voltage range to suit a particular application..
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High precision digital control models
The QL and QPX series offer an unprecedented level of precision by incorporating 16-bit digital control and five digit metering with a resolution of 1mV. This is matched with 0.1mA current resolution
(QL) and remote sense terminals.
Voltage and current can be set directly from a numeric keyboard or can be set in quasi-analogue mode using a spin-wheel.
The very high accuracy and stability of the QL series makes it suitable for use as a calibration source as well as a power supply. |
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SILENT COOLING
Most TTi power supplies use convection cooling thus removing the need for a fan and providing silent operation.
Certain models which offer particularly high power density (e.g. EX4210R) use fan-blown cooling to limit temperature rise in the power section.
Additionally, the QL series of high precision linear power supplies uses fan cooling to minimise power related temperature variation within the precision analogue circuitry.
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SAFETY TERMINALS
TTi has introduced a new terminal design to most of the power supply
range. The new terminals accept a 4mm safety plug with rigid insulating
sleeve, a requirement specified by an increasing number of laboratories
for safety reasons.
However, unlike the usual 4mm safety sockets, the
new TTi terminals can also accept fork connectors or bare wires, giving
maximum flexibility.
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RACK MOUNTING
Rack-mount kits are available for both bus programmable and standard bench power supplies. TSX and CPX models use a 3U rack capable of taking one or two units. QL models use a 4U rack. Up to three QL singles can be mounted side by side or one single plus one triple.
New PL series models are 3U high but use a 4U rack to provide
ventilation top and bottom, up to 4 single output units (or a
combination of singles and duals) can be mounted in a single rack width.
QPX models use a 3U rack mount. |
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