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High voltage power supplies
PROXITRONIC offers specially developed power supplies for the safe operation of various
kinds of image intensifiers. Each type of power supply is available as a separate box or
as "wrap-around" (also called "integrated", see image).
The latter ones are potted into an annular, cylindrical housing together with the image intensifier. Separate power supplies are supplied in a rectangular mumetal housing. The free cable ends are connected to the corresponding cables of the image intensifier or MCP detector.
The power supply itelf just needs to be supplied +12 VDC. MCP gain is adjusted by varying the corresponding control voltage between 0 and 5 V continuously using any adjustable low-voltage external DC voltage source.
Technical data of the high voltage power supplies for image intensifier diodes PROXIFIER®
| min. | typ. | max. | remarks | |
|---|---|---|---|---|
| input voltage V | +10 | +12 | +15 | |
| input current mA | 30 | 75 | short circuit limitation | |
| output impedance MΩ | 300 | 400 | 500 | |
| photocathode voltage V | 0 | ground connection | ||
| screen voltage kV | +10, +12, +15 | depending on type |
Technical data of the high voltage power supplies for MCP image intensifiers and open MCP detectors
| min. | typ. | max. | remarks | |
|---|---|---|---|---|
| input voltage V | +10 | +12 | +15 | |
| input current mA | 30 | 75 | short circuit limitation | |
| photocathode impedance GΩ | 1 | other values available | ||
| photocathode voltage V | -180 | -200 | -220 | fixed against MCP input |
| MCP input voltage V | 0 | ground connection | ||
| MCP output voltage V single MCP double MCP triple MCP |
+400 +1000 +1500 |
+800 +1800 +2700 |
fixed against MCP input | |
| screen voltage kV | +6 | +7 | fixed against MCP output | |
| control voltage V | 0 | +5 | external gain control |
Dimensions & connections
All image intensifiers with a fiber optic output window have an ITO (indium tin oxide) coating on the outside of the fiber optic. This transparent and conductive layer is contacted by an additional green wire. The standard setting of the ITO coating is ground.
High voltage power supplies for image intensifier diodes PROXIFIER® have the same dimensions as shown in the drawings below, but with the omission of the connections for the MCP and gain control voltages
The separate high voltage power supplies for PROXIFIER® diodes have a special heavy duty high voltage silicon cable (white) for connection to the phosphor screen and a teflon isolated ground wire (blue) for connection to the photocathode. On the low voltage input side, instead of cables there are 2 pins for connection to the supply voltage which are marked with "-" (ground) and "+" (+10 V ... +15 V).
Low voltage cable length is normally 30 cm. Image intensifier and separate power supply are also connected with 30 cm cables. Longer cables are available on request.
"wrap-around" power-supply
The outer diameter of the integrated high voltage power supplies for all 40 mm image intensifiers is 95 mm.
block power-supply
Type nomenclature
High voltage power supplies for image intensifier diodes PROXIFIER®:
| I2 type family | high voltage power supply | design |
|---|---|---|
| BV 250... 08 | PS 1015 Q00 D10P | separate |
| BV 250... 10 | PS 1015 Q00 D12P | separate |
| BV 250... 18 | PS 1015 Q00 D15P | separate |
| BV 253... 08 | PS 1015 R75 D10P | integrated |
| BV 253... 10 | PS 1015 R75 D12P | integrated |
| BV 253... 18 | PS 1015 R75 D15P | integrated |
| BV 400... 08 | PS 1015 Q00 D10P | separate |
| BV 400... 10 | PS 1015 Q00 D12P | separate |
| BV 400... 18 | PS 1015 Q00 D15P | separate |
| BV 400... 08 | PS 1015 R95 D10P | integrated |
| BV 400... 10 | PS 1015 R95 D12P | integrated |
| BV 400... 18 | PS 1015 R95 D15P | integrated |
High voltage power supplies for MCP image intensifiers MCP-PROXIFIER®:
| I2 type family | high voltage power supply | design |
|---|---|---|
| BV 256... | PS 1015 Q00 S06P | separate |
| BV 256... -V | PS 1015 Q00 V06P | separate |
| BV 256... -Z | PS 1015 Q00 Z06P | separate |
| integrated | ||
| BV 258... | PS 1015 R75 S06P | integrated |
| BV 258... -V | PS 1015 R75 V06P | integrated |
| BV 258... -Z | PS 1015 R75 Z06P | separate |
| BV 406... | PS 1015 Q00 S06P | separate |
| BV 406... -V | PS 1015 Q00 V06P | separate |
| BV 406... -Z | PS 1015 Q00 Z06P | separate |
| BV 408... | PS 1015 R95 S06P | integrated |
| BV 408... -V | PS 1015 R95 V06P | integrated |
| BV 408... -Z | PS 1015 R95 Z06P | integrated |
High voltage power supplies for open MCP detectors:
| MCP detector with | high voltage power supply | design |
|---|---|---|
| 1 MCP | PS 1015 Q00 S06P | separate |
| 2 MCPs | PS 1015 Q00 V06P | separate |
| 3 MCPs | PS 1015 Q00 Z06P | separate |
Gating of image intensifiers
Gating of MCP image intensifiers is easily accomplished due to the power supply's photocathode voltage high output impedance. By applying +12 V from a low impedance voltage source, the photocathode is securely switched off and no light will pass through. Upon disconnecting this voltage, the photocathode returns to its operational voltage after a delay of 50 ms to 100 ms. If a shorter delay is required, a separate low Impedance pulse and delay generator is required to supply pulses between -180 V (on) and +12 V (off) for 100 ns or longer gate times, or between -180 V (on) and +80 V (off) for 5 ns or longer gate times, depending upon the shortest pulse duration needed.
PROXITRONIC offers pulse generators and pulse amplifiers for all image intensifiers. Technical details are described in the corresponding data bulletins.