what is a variable power supply
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Variable Power Supplies Projects and Circuits (10) A stable variable power supply with an adjustable output voltage from 5 volts to 30 volts can be
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- Patents. A variable speed constant frequency generating system for generating constant frequency electrical output power from a variable speed source of motive power includes an exciter for generating excitation current, a main generator for developing the output power, both of the exciter and main generator...
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How do I determine how big my power supply is? Consequently, you can only determine the total output of a power supply by physically examining it. All power supplies, like the one shown to the right, have a sticker that gives all important specifications. For example, this power supply lists the total output as 330W (watts).
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Regulated power supply (June 2012). A regulated power supply is an embedded circuit; it converts unregulated AC into a constant DC. With the help of a rectifier it converts AC supply into DC. Its function is to supply a stable voltage (or less often current), to a circuit or device that must be operated within certain power supply limits. The output from the regulated power supply may be alternating or unidirectional, but is nearly always DC (Direct Current).
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Basics of Class 1, Class 2 and Class 3 remote control, signaling and power-limited circuits Class 1, 2 and 3 circuits are defined primarily in terms of the power supply to which they are connected. Power supplies are generally batteries, transformers or electronic power supplies. When working on an existing installation, it is a simple matter of identifying the power source and checking its marking.
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Constant current Constant current power supplies In electronics, a constant current system is one that varies the voltage across a load to maintain a constant electric current. When a component is indicated to be driven by a constant current, the driver circuit is, in essence, a current regulator and must appear to the component as a current source of suitable reliability. An important usage of constant current power supplies is with LEDs.
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Switched-mode power supply This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.
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- The power supply in a PC is a complex device using switch mode circuitry and transformers to generate +and- 12v, for modems and communications ports. +and-5volts for the … logic circuitry,3volts for the processor. All these supplies are generated and electronically regulated.
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Words for Power Supply Engineering This is usually defined as the voltage between the input and the output (or chassis) of a power supply that would cause it to either fail, or to conduct a certain number of microamps of DC current, and is often in the kilovolts.
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Troubleshooting switch mode power supplies We're taking here about mains voltage (say 120 V or 230 V AC) power supplies with power ranging from a few Watts to several hundred Watts. Switch mode power supplies are everywhere; here are some pictures of their guts. The big high power components and small heat sinks are typical of SMPS. These devices are incredibly reliable, but being very often left powered all the time (even when their load is switched off), they still are the weak link.
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Variable-frequency drive A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.n the United States, an estimated 60-65% of electrical energy is used to supply motors, 75% of which are variable-torque fan, pump, and compressor loads. Eighteen percent of the energy used in the 40 million motors in the U.S. could be saved by efficient energy improvement technologies such as VFDs.
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- If the power supply provides a constant current, then your voltage drop across the resistance will increase according to V=I*R. If you have a constant voltage supply, then the voltage stays the same assuming you were not current overloading your supply before increasing the resistance.
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How Do Hurricanes Form? It can be up to 600 miles across and have strong winds spiraling inward and upward at speeds of 75 to 200 mph. Each hurricane usually lasts for over a week, moving 10-20 miles per hour over the open ocean. Hurricanes gather heat and energy through contact with warm ocean waters.
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Question: IN a typical Ac circuit the supply voltage 10 Vpk and frequency is 60 Hz. If the current thru the... IN a typical Ac circuit the supply voltage 10 Vpk and frequency is 60 Hz. If the current thru the system is 2 Apk with a phase angle of 20 degree. Then the power factor is?
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Power-supply Valve rectifier power supplies. Most early valve rectifier power supplies were Full wave, Capacitor input. Two half wave rectifiers in opposite phase, charge up the first Electro to the peak of the pulsating DC. The peak of the pulsating DC wave is x 1.414 greater than the RMS.
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- Below is the Difference between Switch Mode (Switching / Regulated) and Linear (Unregulated) Power Supplies.Switch Mode (Regulated). A switched-mode power supply (SMPS) works on a different principle. AC mains input is directly rectified without the use of a transformer, to obtain a DC voltage.elow is the Difference between Switch Mode (Switching / Regulated) and Linear (Unregulated) Power Supplies. Switch Mode (Regulated).
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- A power supply is the device that ensures that your personal computer has power and is functional. The power supply gives the user the ability to turn on the PC. It is a square box attached to your motherboard that comes with your PC.
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- Low-voltage external power supply means an external power supply with a nameplate output voltage less than 6 volts and nameplate output current greater than or equal to 550 milliamps. Basic-voltage external power supply means an external power supply that is not a low-voltage power supply.
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Power-supply The B+ supply Voltage from early valve rectifier power supplies drops as the output valves warm up and conduct current. Removing the output valves so no current is being taken from the power supply will cause the B+ Voltage to rise close to the academic formula. 360V AC x 1.414 = 509V DC.
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Uninterruptible power supply An uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails.n uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails.
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Power supply unit (computer) A power supply unit converts mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use switched-mode power supplies. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage. Most modern desktop personal computer power supplies conform to the ATX specification, which includes form factor and voltage tolerances. While an ATX power supply is connected to the main
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Flexible power generation keeps facilities up and running. Flexible power generation keeps facilities up and running. Whether you’re running crucial equipment or powering your jobsite, WPI offers industry-leading solutions ideally suited for both standby and prime power applications, backed by experts with an unmatched level of support.
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What is a Power Supply Voltage Switch? For example, if you live in the United States, the power supply voltage switch on your computer's power supply should be set to 110/115. However, if in, say, France, you should use the 220v/230v setting.
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- V Semi-Modular (VSM) power supplies feature a design that allows you to only connect cables that your system needs. Fewer cables mean less mess and better airflow inside your case. Nobody likes trying to figure out what to do with that bundle of extra cables and with a VSM power supply, you won’t have to.
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supply voltage supply voltage. (electricity). The voltage obtained from a power source for operation of a circuit or device. 1  Facebook.2  Twitter.upply voltage. (electricity). The voltage obtained from a power source for operation of a circuit or device. 1  Facebook.