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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.
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, PL, QL and TS series, as well as on the TSP3222.
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 and TSX series.
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. Although producing slightly higher noise levels than the standard mixed-mode regulation, performance is still excellent.
PowerFlex regulation is used on the CPX series.
PRECISION
Measurement and control
With the exception of the ‘powerpack’ and ‘basic’ models (TS1410 and EB2025T), all TTi laboratory power supplies offer high accuracy digital meters together with high resolution controls and dc output switches.
Standard models
The 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.
Separate coarse and fine voltage controls allow rapid and precise adjustment whilst a semi-logarithmic current control provides increased setting resolution at lower currents.
Precision models
The EX-R, PL, 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.
High precision digital control models
The QL 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 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.
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.
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. PL and QL models use a 4U rack. Up to three QL singles can be mounted side by side or one single plus one triple. |
