P2d - Cryogenic Power Supply

Description

P2d is a power supply module for cryogenic electronics. It supplies a regulated output voltage level, stable across switching actions and load conditions. The P2d has four output channels - Power Supply1, Power Supply2, Power Supply3, Power Supply4. The voltage level at the output is determined by an input voltage level. Each output connector has its corresponding input connector.

For protection of the cryogenic samples the P2d has a maximum current limit, with four different levels available. The choice of current limit is set by the physical output connector used and by user settings given via SW. Power Supplies 1 and 2 are the high capacity supplies. They offer current limits of either 100mA or 10mA, selectable by the user. Power Supplies 3 and 4 are the low capacity supplies. They offer current limits of either 1mA or 100uA, selectable by the user. If the load draws current above the limit, the current will cap close to its limit and the output level will shift (in all likely loads, will drop).

Note that the default (boot) state is not deterministic. The P2d software allows the user to set the active/inactive and the high/low current limits module to bring the module into the required state.

The load being supplied from the P2d may exhibit sudden changes in its consumption, such as in the case of switching between sample conditions or connections. The P2d would adjust to maintain the output level under the new loads conditions (load regulation). However, the P2d has a finite bandwidth. This means that in reality returning to the stable and correct output level will take place over a finite settling time, during which there may be some ringing and output levels may momentarily be above or below the target level.

Each output channel has two status LEDs: 'Active' which indicates the channel is enabled, and 'Fault' which indicates the current has reached its set limit.

There are other cryogenic supply modules which are not remote controlled and cannot provide a remote read-out. For further info check the info on the P2b, P2c modules on the IVVI rack website.

Specifications

Parameter Value Units Conditions
Max Output Voltage 5 V
Max Output Current 100 or 10 mA Power Supply 1, 2
1000 or 100 uA Power Supply 3, 4