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211 Threads found on Power Line Voltage
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 (...)
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.
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
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
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 (...)
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 (...)
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. (...)
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
1) I use a low power device which will switch (and stay) into one state when 3-12V is applied to it and switch (and stay) into another state if 3-12V is applied to it in reverse polarity. 2) I have one control output which will be able to supply 0V (off) or either 1.5/5.5V (on). Now I need to control that device (1) with the control input (2)
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
Hi guys, I am in the way of put some leds to an active speaker that I am building. This speaker has 3 drivers, one is for bass, and two for voice and stereofonic sound. The amplifier board is one of those popular circuits you can find on ebay, which have two amplifiers class D, one bridged giving 100w to a subwoofer, and 50w+50w for the voice drive
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?
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 (...)
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
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
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.
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 (...)
Hi, Are you talking about a power grid? AC, three phases? And the voltage drop because of load current and source impedance? Klaus
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 (...)
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 (...)
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 (...)
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 (...)
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 (...)
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 ?
What about margin for PLT? What attenuation of power line transients do you have at switching rate, f.
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
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.
There isn't a thing like "RMS power". The first equation is right for transferred real power, the second is nonsense.
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.
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 (...)
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
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 (...)
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?
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 (...)
This may help: You can directly connect the MOV between power lines i.e. phase and neutral. Hope that helps.
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 (...)
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
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?
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.
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 (...)
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,
It's no theoretical problem to assume an amplifier with infinite input impedance and thus infinite power gain, e.g. a voltage buffer.
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
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.
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
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
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 (...)
Post your microcontroller circuit and its USB connections. USB port can power the micro. It can supply 500 mA.
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 (...)