AP-11: Updating from User-Regulated Proportional HVPSs
to UltraVolt's Off-the-Shelf Regulated HVPSs
download as PDF
In the past, engineers have had to use proportional high-voltage power
supplies (HVPSs) for their
low-power needs. If the application required tight tolerances or output-voltage
engineers built their own regulated HVPS. By placing a control loop around
a proportional HVPS,
a regulated output voltage with stable characteristics could be maintained.
Isolation was generally
not an issue, so a specific polarity output was available.
UltraVolt manufactures a line of off-the-shelf standard
products incorporating internal regulation
circuitry. These switching power supplies help achieve a more cost-effective,
power system. Let's examine the different areas where the UltraVolt HVPS
What is the cost of the proportional HVPS? While
most proportional-regulation solutions are similar, the most basic circuits
consist of assembling a minimum of 12 parts into a subassembly. Typically,
that consists of the following:
|OEM proportional HVPS
||stable voltage reference
||various compensation/trim capacitors
||various compensation/trim resistors
||input filter capacitors
Assembly and Inspection labor
Test and Troubleshooting labor
Note the impact on overhead where the individual
parts listed above must be procured, expedited, received, inspected as
parts, kitted, assembled, inspected, tested as a subassembly and burned
in. In addition, subassembly manufacturing documentation must be maintained.
UltraVolt's single-part solution costs less.
UltraVolt's single-part solution lasts longer! As
an assembly, our 4-watt HVPS has a mean time
between failures (MTBF) of 654,583 hours at 55°C. What is the MTBF
of the proportional HVPS?
Is that calculated at 55°C or 21°C? Does that MTBF factor in the
12 or more components
required for regulation?
UltraVolt's single-part solution is easier to shield!
All of our HVPSs have reduced emissions.
Optional wrap-around Mu-metal shielding further reduces EMI & RFI emissions
applications. Conversely, the proportional HVPS solution will radiate more
noise, due to its
inherent design and because the radiating components are spread over a
larger surface area. If the unit requires full shielding, you must also
box in the proportional HVPS and ALL of the
regulation circuits with a custom shield. Not only will this increase the
cost, but it will also raise
the ambient temperature, increasing drift and reducing component life.
UltraVolt's single-part solution is smaller! With
a footprint of only 5.5in2, along with a volume of
4.3in3 our HVPS frees up valuable space in your system. If your product
is portable, the
proportional power supply solution adds to system weight. The proportional
HVPS solution also
uses up valuable space that could be used to enhance your products.
UltraVolt's single-part solution is more powerful!
With 12VDC models producing 4 watts, and
24VDC models producing 20 watts, our HVPS can provide all the power required
system. Typical proportional solutions have limited output power from 1
to 3 watts.
UltraVolt's single-part solution is fully compatible!
Output voltage can be programmed just like the
proportional power-supply solution. Both resistance and voltage programming,
along with simple
two-resistor scaling, are fully supported.
As you can see from the analysis above, it is evident
that the single-component solution has
many advantages. Whether your interest is in reducing production cost,
raising system MTBF, or
finding more space for new circuits, we believe UltraVolt's series of regulated
HVPSs will help
you to reach your goals.
*** END OF APPLICATION NOTE #11 ***