Bare Board
Universal H.V. power supply
Selectable:
VOLTAGE DOUBLER or BRIDGE RECTIFIER CIRCUIT
INTRODUCTION
The Universal H.V. Power Supply is unique, in that either a Bridge or voltage-doubler configuration can be selected. Every feasible protection & safety possibility has been included in this design.
The Tactical Radio Gear, Universal H.V. Power Supply PCB is intended for amateur radio amplifiers, requiring up-to a 4.5KV plate supply. The design is conservatively rated for 4500 VDC @ 2A ICS; and contains most everything needed on one PC board.
BUILDERS
Dimensions of the board: 6.9” x 7.97” inches. For those planning to build their own, the voltage rating of the filter capacitor(s) in addition to the number of capacitors selected, will determine the power supply's maximum working voltage. The Universal H.V. Power Supply will accept the common (10mm) lead-spacing. Ten capacitor positions are provided, each one with provision for its own equalizing resistor.
FEATURES
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The Universal H.V. Power Supply PCB is laid out for up to 10 x capacitors: 680uf to 1000uF @ 450vdc. Tolerance: +/-20% Temperature rating 105˚C
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20 x 1KV @ 10 amp diodes, with 600A peak surge (5 x per leg).
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PCB MECHANICAL DETAILS
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The PCB is a Heavy-Duty 2mm thick board, with 2 ounce copper on both sides.
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10 x ¼” – quick disconnect spade lugs, provide convenient connections, to make installation & removal of the module fast & easy. Or simply solder them to the PCB.
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(5) X 8-32 mounting holes are provided, for insulated stand-offs, to mount the PCB.
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.01uF @ 1KV disc capacitor is provided for each of the rectifier diodes. These caps suppress the commutation spikes, which are generated when the diodes turn on to charge the reservoir capacitor, near the peak of the input sine wave. These suppression capacitors are especially important for sensitive equipment, like high-performance transceivers’ where commutation spikes can infiltrate the whole system!
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Each diode has a 470K/2W equalizing resistor, for additional spike/surge and glitch protection; common with some types of tubes; and AC Line service(s)? They also provide a bleed-down path.
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Each filter capacitor has a 360K/3W equalizing/bleeder resistor providing a second bleed down path.
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Provisions for meter multiplier resistors are located at both the B- & B+ ends of the power supply. Multiple accessory (3W) resistor positions are provided on each buss, to allow the user to design their own IP monitoring arrangement & glitch resistor arrangement(s) if mounted on the PCB.
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The builder can determine what value(s) of equalizing resistors are best for their particular circuit arrangement. These component values are recommended; but the builder is free to specify their own values. The 10A10 rectifier can be substituted with the popular 1N5408. Additionally the equalizer resistors can be changed to accommodate the builder’s preference(s).
