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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 (...)