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# Power Line Voltage

211 Threads found on edaboard.com: Power Line Voltage

## Capacitive Power Supply

Hi I want to design a capacitive power supply , with i/p voltage as 90V to 270V and o/p voltage as 24V , how can I calculate maximum current of the circuit? I calculated the capacitance of the X-rated capacitor by the formula X = 1/(2* pi*f*C) where f=50-60Hz. Then calculated the current by the formula I = V/X , where V is the input (...)

## Three phase power supply circuit for three phase power meter

Hi, can anyone suggest me a simple power supply circuit for three phase energy meter. the meter must be able to operate from any single phase when other phases are off.

## Help for selecting for Components for power line communication

Guys.. I am making the project for the Air conditioner.. For that, For power line communication.. i got one readymade circuit which is logically correct. Now, pls check the Figure and let me understand why the capacitor C77 and C24 used.. And, what will be the value if i go for this circuits.. Let me also understand that, pre

## Differential line terminator power

Hello there, I have a question regarding differential line resistor power in quadrature encoders applications. 133276 Assuming RT is 120R and VCC of IC's is 5V, my understanding is that (with steady state, no data transfer) power dissipation on RT is: P = 5V^2 * 120R = ~0.2 W The question is- Am I

## Unpowered devices on SPI line (memories retaining contents)

Hi folks, I am working on a project where there are few SPI memories on the bus. To have a cold sparing, some memories are turned off with an aim to be turned on when there is a problem with the power ones. I have tested few SPI memories, but whenever you have unpowered SPI device on the bus, the lines get loaded and the (...)

## Best PWM frequency for DC motor driver

This depends a lot on the power switch element and the DC motor attributes. Your armature inductance will be one concern, you need ripple current to be sensible (maybe 10% of full load amps) and you can get that from worst case max line voltage and motor inductance (though I'd guess maybe this is modal too, what's the worst case minimum (...)

## Ac current sensing methods

power lines carry environmental transients from lightning which may be common to both line and neutral from induced currents. Typical good consumer products are rated for immunity of 3kV 10us transients. Therefore optical and transformer isolation is the most common method of isolation to local circuits that may or may not be grounded. (...)

## Unwanted circuit coupling between PCA9685 and power line

There is surely no 470 mF capacitor in your circuit, might be 470 ?F. power supply noise is just normal operation. Welcome to the real electronics world. Bypass capacitors might show no effect because they are connected the wrong way, or you are measuring at the wrong circuit nodes. It's necessary to look at the complete power supply and L

## Looking for a circuit which can reverse polarity using just one control input line

Use output to control relay or High Side power switch using 3V logic and supply. Logic voltage = minimum input V+ swing to guarantee Hysteresis e.g. 3~3.3V Signal clamps must use Schottky diodes to protect CMOS. R values can be scaled up if desired. 131366 It also converts the bipolar input voltage to the supply voltag

## How to amplifying small signal to high voltage

I'd like to generate the transient in power line system from D/A as image below. 131160 There are 2 points that I want to know including. 1. How to amplifying small signal from D/A to very high voltage 220V? 2. How can I accomplish the rise/fall time of such level (10uSec at more than 500V)? This signal is j

## TIP31 feeding about 25 leds (audiorhytm circuit)

What voltage is available? +\-50? line output is usually 1Vrms and fixed , is that avail? This will be a convenient power source and determine array configuration of 3.2V LEDs in ser/par. What dynamic response do you expect? There are many kinds which can be smooth, logarithmic, fast attack, slow decay, glow intensity with voice speakers (...)

## Measuring 3 Phase voltage through PIC micro controller

More questions. - Does "without any transformers" refer to voltage measurement only or also to processor power supply? - Do you connect neutral line or 3 phases only?

## how to measure line to line voltage in pic micro

I guess you mean disconnect a phase (open circuit) when you say "phase failure"? In this case, two phase-to-phase measurements drop to half the regular voltage. But in a real power supply network, the remaining voltage depends on the connected other load. Even in the open circuit case (no other load connected) you can get different results (...)

## microstrip antenna design - help

So it is not just an antenna, it is energy saving LED power supply circuit. L1 is an antenna to pick up energy from 5.8 GHz radio sources. Efficiency of this antenna will be maximized when it is resonant at operating frequency. Also it's aperture should be maximized. How do you know it is specifically designed for 5.8GHz? What these boards are made

## UART ttl signal level shifter with 2.7V supply voltage and low power MCU

Hello guys, from past few days I'm dealing with LPC11U24 cortex M0 micro-controller. I've a system with produce only 2.7V for entire circuit, in short my VCC is 2.7V(I've programmed MCU with power down mode using it's PMU). In my code I'm using UART at 4800 baudrate. Now cumming to the point, I need TTL level shifter(ic or

## AC power meter dsign with power factor information

hi I want to design a energy meter using 8 bit Pic micro-controller. I want to know the following 1)How voltage is measured. 2)How current is measured. 3)How power factor can be measured.

## 2x16 LCD module - life of the LCD module

Hi, Many years ag we also had trouble with failing LCDs. We found out, that it is caused by high voltage spikes coming from a signal line. Besides of overvoltage (spikes) on signal lines or power supply, or even the metal case during normal operation, such failures are typical for ESD problems during (...)

## Power Transmission Voltage Dropping curves

Hi, Are you talking about a power grid? AC, three phases? And the voltage drop because of load current and source impedance? Klaus

## Using L6699 with 3-phase AC-line

Total power=5 kw topology= Half-bridge Resonance(LLC) Isolated Output == 30v DC - 160A Input line=Three phase (380v) As I see at the datasheet of L6699 , pin14(OUT) of L6699 should connect directly to the midpoint of half-bridge and the ground of l6699 and the ground of line(3phase) is common. I want to know how can I isolate them? Can (...)

## Make my own UPS with my inverter ?

Normally PSU has a holdup time of 1 cycle but depending on your load and nominal input voltage, and other factors, and your's may be oversensitive. Can you test your UPS with a charger for transient line interference? Can you scope power OK signal? My 2nd choice is to get a PSU with twice the capacity so it has a longer holdup time. My 3rd (...)

## Low voltage conducted emissions setup(10-40V)

I would think load dump suppression devices should be satisfied with a bipolar TVS and conducted noise improved with low ESR C on input or series choke. A LISN (50Ω/5?H) is used for AC power line conducted emissions measuring voltage for AC line external connections. Battery conducted emissions , can be done (...)

## Inductors in parallel

Maybe just semantics, but heating coils are not big on inductance from line frequency and the word heating is a clue that they are mainly resistors that are coiled. The inductance part doesn't dissipate heat. Another thought is that the power source is assumed to be << 1% of the net load resistance, so the voltage drops .<1%. Thus (...)

## IR2153S Power Supply for Piezoelectric Actuator

I am making a Piezoelectric actuator driving circuit using Half Bridge. I have to make it work at 220Vrms, 60Hz line voltage. Currently I am testing it at 100Vrms, 60Hz voltage. The line voltage is rectified and converted to DC link voltage. IR2153S is used as driving chip to drive (...)

## Why do VR's need a Load Line (LL) to power hiigh performace CPU's

I was wondering ; What is the purpose for using a LL to power high performance CPU's ( i.e. as per Intel's VR12.5 Spec) , and how/why is the "Active Transient Compensator" (or Active voltage Positioning) used for in VRM's ?

## PFC output voltage 420VDC?

What about margin for PLT? What attenuation of power line transients do you have at switching rate, f.

## Stacking offline PSU's to give twice the voltage and power?

Hello, We wish to supply 96V, 100W to a LED luminaire which has a constant current led driver and dimmer with it. Can we simply ?stack? two 48V offline psu?s in series to provide the 96V? (eg two CLG-100-48 type PSU?s)? CLG-100-48 PSU. ...also, can we ask Meanwell

## Slef powered USB device

Doesn't explain USB interface damage, but USB specification require a self-powered device to monitor the VBUS line and not to drive to bus lines before a voltage has been detected.

## Flyback efficiency calculation: RMS or AVERAGE power?

There isn't a thing like "RMS power". The first equation is right for transferred real power, the second is nonsense.

## how to read voltage,current,power from maxq3180

i am new to maxq3180. i successfully communicate with maxq3180 through spi. but i dont understand how to acess the registar and how to convert actual voltage and current. i read some registar like volt_cc,current_cc,power_cc but value have no affect if line voltage is removed.please help me. thanks in advance.

## Ultra clean mains voltage

power line quality is measured by "per unit" variations of voltage, frequency, transient noise, harmonic content. This is greatly affected by line impedance. The grid has a much lower impedance than any small generator and especially much lower than a UPS. UPS work well for most applications, but the flat top can induce (...)

## Power supply failure after a few months??????

Putting the two power supplies in series across 48V is a potential problem. The two supplies will need to be very evenly loaded to avoid the voltage across one of them exceeding the specified +/-10% limit

## Constant Current Supply

A linear power supply heats a lot when its input voltage is high, its output voltage is low and its current is high. A switcher does not heat much. So use a switcher if you can find one or add a power transistor to the 3A one. If you reduce the value of the current sensing resistor then that resistor does (...)

## Monitors goes off and makes weird noise

It sounds like bad power. Maybe you should measure your line voltage with a meter. A UPS MIGHT help, but if this is a continuous problem, you need to resolve that first. Where are you? Certain areas of some countries have notoriously bad power. Have you talked to your neighbors to see if they are also having issues?

## problem related to power electronics

I am working on three phase voltage source inverter and PWM techniques. I've implemented SVPWM technique for this inverter using MATLAB and found line to line voltage, line to neutral voltage etc. I want to use filter to filter out Vab and Van. can anyone tell me what is the syntax for (...)

## using mov varister in ac line 230v

This may help: You can directly connect the MOV between power lines i.e. phase and neutral. Hope that helps.

## power factor regarding

power factor is measured in degrees of angle. Its the angle between real and apparent power. power factor = real power/apparent power=Watt/VA=theta degrees. It gives the information of how much lag is in between AC line current to voltage. In real world, the electrical (...)

## How to measure, how much power my moped generates

LOL Brian, no way! My Puch Maxi is awesome, and they are actually getting kinda popular again. :D I am doing this experiment to see what kind of LED configurations I can use :) I guess using light bulbs would do the trick. But then I could also just use power resistors? I was wondering if I could roughly use the same calculations as I would with D

## High Voltage Signal generator

I'm building a signal generator which simulate unstable of power line such as Dip, Swell, Transient, Harmonic etc. The concept that I done is that generate signal from ADC and then input to amplifier and finally transformer. I encounter the problem while generated the signal of transient. I found that the transformer can't response the tra

I was thinking if it would be possible to get 5V power from a USB connection that connects AT90USBKey to the board converts the voltage to 3,3V but could I connect a 5V line of my circuit to the AT90USBKey board before the voltage converter?

## What is a power line noise?

If the power line noise is a pure sinewave then a notch filter will remove it. But it has harmonics that a notch filter will not remove.

## Pspice simulation for X-10 Powerline Communication

I follow the instruction in Microchip Application Note AN236 to design a simple PLC. I simulate its modules separately to ensure that it works. But when I attach the PWM signal into the power line through a high pass filter, the power signal is still sine wave! (Of course! It's the power source, the voltage (...)

## connect capacitive power supply in paralle with a 220V load

what will be the voltage on the L line, if i connect in parallel a 5V capacitive power supply ? i am confused because V5V0 should be 5v, and how about L line ? i will connect a 220V load, and i am worried if the L will be also 5V,

## [Theoretical question] Reflection at the input of the amplifier

It's no theoretical problem to assume an amplifier with infinite input impedance and thus infinite power gain, e.g. a voltage buffer.

## how to use relay for viltage conversion

Do you mean as signal or as power source (I mean do you refer to a supply line)? If it's just a signal and you need isolation you can use an optocoupler. If you don't need isolation you can use a resistive divider, a transistor, a mosfet

## S parameter in RF cable

As long as there are no standing waves, voltage and current on a transmission line are linked to power by the cable impedance. Calculation rules are the same as for DC.

## Current sensing circuit with LT1495 : need help

The current sensing resistor is in series with the main current path for the power supply, so how is the opamps supply tied to the main power supply?. Have you measured the voltage on each side of this resistor using the opamps supply as a reference? Frank

## Osillator test problem(shaking in the spectrum analyze)

what are u using for a VCO Tune line power supply? If you are taking a free running measurement, I prefer a battery and a potentiometer with a >10 uF cap as the tune voltmeter. also, u might want to use an inside/outside DC block for the connection to the spectrum analyzer. AC ground loops are troublesome

## Microcontroller (pic) based isolated power supply

I am trying to make an isolated power supply.. The spec is as follows... Vin---line voltage----90 to 265 volt RMS, 50Hz, Vout: 16V Iout: 15A, Converter: Flyback, Switching freq: 100KHz, Please help me on transformer design, Snubber design, Mosfet selection PWM is controlled with (...)

## Problem with power supply section

Post your microcontroller circuit and its USB connections. USB port can power the micro. It can supply 500 mA.

## Voltage Spike Protection

What makes you think it was a spike? Hard-running a converter at low line puts it in an input-current-overstress region of operation unless unvervoltage lockout shuts it down. I've seen stuff burn up from that. You evidently have a poor power quality situation. Rapidly changing VIN can also stress filter components. Only a teardown and (...)