Find power supplies including power converters, AC to DC converters and more. From DC power supplies and power inverters to rectifiers, you will find the power supply unit you need. Use the time-saving Request for Quote tool to submit your inquiry to all the power supply manufacturers and suppliers you select.
Engineering/design and Manufacturing high reliability power supplies, dc/dc converters, linear voltage P/S, ac/dc inverters for the aerospace, defense and space market. Build-to-Print, PCB Assembly and Reverse Engineering capabilities in a Lean Mfg. environment. ISO9000 compliant. CE is 100% Woman Owned.
Five Star Associates is a contract manufacturer, engineering design and consulting company. We offer custom power supply design and manufacturing services. We specialize in regulated, switch-mode, high-voltage supplies to serve military, aerospace and industrial applications.
At Technipower, our power supplies are manufactured with a wide range of applications. For 50 years, our production capabilities have focused on bringing value to our customers as well as providing up-to-date technologies. Consider our power converters which are simple and offer high reliability.
Our power supplies include standard types used worldwide and custom modified to fit your specific application. Our leading power technologies, along with quick delivery, allow us to bring the power you require. We offer a new LED-240 series of 240 watt switching power supplies for outdoor lighting.
We manufacture as well as design power supplies to your specifications. Interact Power is AS 9100 compliant and offers DC power supplies, PDUs, power strips, control panels, power cable assemblies, line conditioners, and rack-mount power supplies which come in a choice of sizes and watts.
Power conversion products provided by Prime Power are used by the aerospace & military industries. We offer turn-key systems & modular products and other power combinations. Our DC power supplies such as our DC/DC converters & AC/DC power supplies meet MIL-STD-810 & MIL-STD-461 military requirements.
Power supplies or power supply units (PSU) are devices
that provide electrical power for electronic components. Power supplies
receive power from a source such as a battery or wall socket. It then
provides power to the electronic device. PSUs can be integrated into
the device or externally attached. Power supplies are necessary to the
operation of just about every electrical device. However, the energy
efficiency of PSUs tends to be fairly low.
Power supply manufacturers offer different style and feature choices.
Some of the PSU styles include board, cabinet, desktop, module, open
frame, enclosed, rack mount and wall mount. Some of the display choices
available are digital numerical displays, analog visual indicators and
graphic or video displays. Some of the various features include adjustable
voltage, adjustable frequency, computer interface, fan cooled, integral
heatsink and overcurrent protection. Other features are as follows: overvoltage
protection, power factor correction, pure sine output, remote on/off
switch, short circuit protection and water cooling. When looking at power
supply manufacturers, consider some of these specifications: the number
of outputs, DC output voltage, DC output power, AC output voltage, AC
output frequency and apparent power.
One of the most common applications for power supply manufacturers is
electrical power for computers. This vital component is a metal box typically
located in a corner of the case of a PC. The power supply unit also contains
the power-cord receptacle and the cooling fan and is usually visible
from the back of a system. PSUs use switcher technology to convert AC
input to lower DC voltages, so they are commonly referred to as switching
power supplies. The voltages commonly supplied are 3.3 and 5 volts, which
are used by digital circuits, and 12 volts, which run motors in disk
drives and fans. In order for the power button to work when the PC is
off, the power supplies have a circuit that supplies 5 volts, called “standby
voltage” or VSB.
There are three types of uninterruptible
power supplies (UPS). An offline
UPS is basically a standby system that provides battery power to equipment
when the main power supplies fall below a set limit. These power supplies
do not cost much and are recommended for home office use. A line interactive
UPS is similar to an offline UPS in that it switches to battery mode
during a blackout. However, this UPS actually boosts the main power supply
when it falls, using a regulator. These power supplies are ideal for
corporate applications. The highest level of protection for an electrical
device is an on-line UPS unit that converts AC to DC and then back to
AC to supply critical power loads. These UPS units, often referred to
as double conversions, contain an automatic bypass to ensure continuous
power supplies during a short-term overload or UPS failure. On-line UPS
systems are perfect for critical loads and sensitive equipment, such
as medical technology.
AC to DC converter converts power from an AC input, such as a wall outlet, into DC current.
AC to DC power supplies are units that provide power
to an electronic device by converting AC current, such as that which
comes from a wall outlet, to DC current at the proper voltage.
Constant current power
supplies control the output current for alterations
in load, line and ambient temperature and time within particular limits.
Constant voltage power
supplies control the output voltage in load,
line, ambient temperature and drift resulting from changes over time
DC/DC converters are used to increase or decrease the voltage level
of DC electrical power, because, unlike AC, DC cannot be changed using
a transformer.
DC power supplies,
such as linear power supplies, switching power supplies, DC/DC converters
and high voltage power supplies,
receive
an input power and output the required form of DC power.
Ferroresonant power
supplies are utilized at higher levels in static
applications, due to their weight. Ferroresonant power supplies are
effective only when the line frequency is extremely stable, as they
are sensitive to changes of input AC frequencies.
Frequency converters, a special type of transducer,
are simply electrical currents that convert periodic signals into their
digital
or analog
equivalents. The most common frequency converters are frequency-to-digital
and frequency-to-DC converters.
Half bridge converters are power switching circuits consisting of
two transistors and two capacitors. Half bridge converters function
in
similar fashion to full bridge converters.
High voltage power
supplies are capable of providing hundreds or
thousands of volts from one or more DC outputs, using linear technology.
Some
high voltage power supplies have adjustable local or computer interface
outputs and are used in specialized applications, including telecommunications,
video technology and medical equipment.
Inverters change DC current to AC current and may be mechanical
(e.g. motor), ferroresonant and solid state.
Linear power supplies have a bulky steel or iron laminate transformer
that acts as a safety barrier for the low voltage output from the
AC input and reduces that input to a much lower voltage. The AC
output is then rectified by two or four diodes, and electrical converters
change the output into low voltage DC, which is regulated into
the
required output voltage by dropping the difference in voltage across
the shunt regulator.
Modular power supplies are comprised of a number of separate subsections,
such as power, input and filter modules.
Off-line power supplies operate directly off the AC line. Off-line
power supplies do not use a power transformer before the process
of rectification and filtering.
Operational powers
supplies have a high open loop gain regulator,
for which passive components can be used to program. The
regulator acts
like an operational amplifier.
Rectifiers are electrical components containing sets of diodes that
change AC into DC.
Switch mode power supplies rectify and smooth AC voltage using diodes
and capacitors, resulting in a high voltage DC, which
in turn is converted by a small ferrite transformer and FETs or transistors
into a safe,
low voltage, high frequency voltage. Another set of diodes,
capacitors and inductors convert that DC voltage into the required
voltage,
the corrections of which are done by adjusting the pulse
width
of the high
frequency waveform.
Uninterrupted power
supplies (UPS) are power supply units that continue
to provide power during the loss of AC input power,
which is achieved through a back up battery and a DC/AC inverter or
DC/DC converter.
A stand alone UPS unit is external to the equipment
being
powered,
while a battery back up UPS is implanted in the equipment.
Power Supplies Terms
Autoranging Input – A sensing circuit for the
input voltage located within the power supply that automatically switches
to the necessary voltage range.
Breakdown Voltage – The highest AC or DC voltage that may be applied
from the input, output and/or chassis of a power supply.
Burn-in – Operating a newly
manufactured power supply, usually at rated load, for a period of time
in order to force early failures or
other latent defects of the component before the unit is delivered to
a customer.
Common-mode Noise – Noise that is typical of DC output and return
lines with respect to input ground.
Compliance Voltage – The voltage output from a constant current
power supply.
Cooling – The removal of heat in a power supply by convection,
forced air, radiation or liquid. Heat comes from regulation, transformation,
filtering and rectification.
Cross Regulation – The percent of voltage change at one output
of a multiple output power supply resulting from the load change on another
output.
Current Limiting Circuit – An
overload protection circuit, which controls the highest output current
of a power supply to safeguard the
power supply or the load.
Design Life – The projected lifetime of a power supply during which
it will run at its stated specifications.
Differential Mode Noise – Also referred to as “ripples,” it
is the noise measured between the DC output and the output return.
Drift – With operating parameters including line, load and ambient
temperature held constant, it is the change in output voltage, following
a warm-up period, over a certain period of time.
Efficiency – The ratio of power in terms of the input power against
the output power. Efficiency is measured at full load and nominal line
conditions.
Electromagnetic Interference (EMI) – Also known as “radio-frequency
interference (RFI),” it is unwanted high frequency energy conducted
through the input or output lines of switching power supplies or radiated
through space. EMI is caused by the switching transistors, output rectifiers
and zener diodes.
Foldback Current Limiting Circuit – A current limiting circuit
that, when under overload conditions, will gradually decrease the output
current to a specified minimum current level under a direct short circuit.
Ground – An electrical connection to earth that has a zero voltage
or another conductor connected to earth.
Inhibit – The capability of remotely switching off the output power
of a power supply.
Input Line Filter – A low-pass or band-reject filter used to decrease
the noise fed to the supply. Input line filters are located at the input
of a power supply and may be external.
Isolation Voltage – The highest AC or DC voltage that can be continuously
run from a power supply chassis or from input to output.
Margining – Altering a power supply output voltage, either higher
or lower from its minimal setting, in order to confirm the system performance
margin in respect to the supply voltage. Margining is typically done
electrically via a system generated control signal.
Minimum Load – The least amount of load current or power that needs
to be drawn from the power supply in order for the supply to meet its
performance specifications.
Non-Shutdown Over Voltage Protection – A feature of a converter
such that it continues to provide voltage to a load at a set upper limit
without turning off and without necessitating a reset when the overvoltage
event ceases.
Overvoltage Protection – A circuit that either shuts down the power
supply or shorts the power supply to ground if an overvoltage condition
occurs.
Parallel Operation – The connection of the outputs of multiple
power supplies with the same output voltage that are designed to share
a load. The parallel operation generates a higher output current than
would be available from a single supply.
Peak Power – The absolute highest output power that a power supply
can create without immediate damage. Typically, peak power is much higher
than the continuous reliable output capacity and ought to be utilized
rarely.
Power Fail – A signal from the power supply interface that relays
a warning that the input voltage is not sustaining full power regulated
output.
Reverse Voltage Protection – A protection circuit that prevents
damage to the power supply if a reverse voltage is applied at either
the output or input terminals.
Safety Ground – A conductive path to earth intended to safeguard
people from electrical shock by shunting away any dangerous currents
that could happen from accident or malfunction.
Turn-on Time – Also known as “warm up time,” it is
the time a converter needs to start running within specification after
proper power has been applied.
