HV Power Supply Model 4400

This high voltage supply is part of a dual-display radar system.  It has some very impressive specs:

• 10KV Output: temperature coefficient of .0027%ºC (2.7ppm)
• Focus adjustable from 2500 - 3000V
• Dynamic focus control +100V / 10µsec step response
• Focus tempco 2ppm

Our design consisted of 4 separate modules.  Each module contains a push-pull driver section and a potted output module, and produces one (HV) output.  A fixed 10,000V reference voltage (from a VERY good source) fed all modules, where it was compared to a divided sample of its output (from VERY good high voltage dividers).   The resultant error voltage controlled the voltage to each module.

The dynamic focus requirement was met with a high voltage discrete-component amplifier which added the dynamic focus voltage to the low side of each (floating) focus supply.

Electrical

Input:

• Voltage  26VDC +10%
• Current 1.35A max at nominal output
  

Output:

J1, J2 (Anode):

• Voltage  10KV fixed output (+2%)
• Current  5µA nominal, 20µA max
• Regulation +0.1% load, +0.05% line
• Ripple 5V p-p, maximum
• Temperature Coef.  .0027%/ºC  0 to 55ºC, .0054%/ºC  -54 to +85ºC

J3 (Anode):

• Voltage  10KV fixed output (+5%)
• Current  50µA nominal, 100µA max
• Regulation +1% load, +1% line
• Ripple 10V p-p, maximum
• Temperature Coef.  .036%/ºC  0 to 55ºC, .036%/ºC  -54 to +85ºC

J4, J5 (Focus):

• Voltage  2500 - 3000V, adjustable via external potentiometer
• Dynamic Focus  0-200V, 1:1 from user input
• Current  50µA nominal, 200µA max
• Regulation +0.1% load, +0.05% line
• Ripple 3V p-p, maximum
• Temperature Coef.  .002%/ºC  0 to 55ºC, .04%/ºC  -54 to +85ºC

Protection Circuits

• Output Overload  Supply protected against excessive load on output
• Short Circuit  Protected against output shorts for an indefinite time
• Reverse Polarity  Inputs protected against reverse polarity

Environmental

• Operating Temperature -54°C to 85ºC
• Humidity To 100% (fully sealed construction)
• Shock  Per MIL-STD-202, Method 213B, 25G
• Vibration  Per MIL-STD-202, Method 204C, Condition A
• Thermal Shock Per MIL-STD-202, Method 107D, Condition A