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# Transformer Constant

42 Threads found on edaboard.com: Transformer Constant

## Problems with Gate Driver IC

could I just use a transformer from mains and then rectify and supply to Vb as long as the transformer supply voltage is higher than the H-Bridge supply? No. Vb must be held at a constant 12 to 15 V offset (=VCC) above Vs, the diode is achieving this in combination with C2 in a regular half bridge configuration (low side drain conne

## [moved] How to get desired dc voltage and current?

If you have a (more or less) constant load, you can make a simple linear power supply. If you want to avoid a bulky transformer, go for a SMPS design. If you want a tight regulation of the voltage, you need to consider a regulated supply.

## Wide range LC oscillator with constant amplitude

Hi, I would like to try the oscillator in Fig. 8 of the attached article. What options do I have to achieve a -15v for VCC for this circuit? Also, can I connect the output to such a transformer (above diagram

## Pulse Skip Modulation for Inductive load

Depending on the load type (cos phi respectively ratio of reactive and resistive load impedance), precise full wave switching can be quite difficult, particularly if cos phi isn't constant, e.g a transformer with variable load. Avoiding saturation of transformers and other magnetic cores is an additional challenge. You would have to (...)

## quarter wave transformer

hello I need to design quarter wave transformer to match 50 ohm line to 100 ohm load by hfss but i don't know what is the best dielectric material i can use,and where i can place the two ports,and can i get the same bandwidth as theoretical value . please can any one help me.

## Full Bridge Transformer primary voltage is constant and not varying with gate signal

I have attached my h bridge circuit. Input to the Gate pulse transformer is fed from a MOSFET driver in series with Damping resistor of value 10 ohm and 10uF capacitor. 124990 I hoped that the Resistor across gate and source can discharge the capacitance but it is not happening. I checked at the source point of the high sid

## Perpetual motion transformer

Can someone explain these specs to me, it looks like the latest and greatest oil furnace ignition transformer put's out more power than it uses. Background I have been looking at ways to make my oil fired furnace more efficient. One of the things that caught my eye was the new oil ignition transformer that has a 35 VA input compared to my

## lm334 constant current generator

Normally Colloidal silver is generated with high V transformer and variac and big 50W power large value R to limit current.

## Parallel BJT with constant DC supply

" the current at output > current at input ". To get this you need some form of convertor which in essence is a DC transformer. The conservation of power must hold, so if the input is 50 V at 1A (50 W), you can only get 50W out, i.e. 5 V at 10 A. These circuits convert the input DC into an AC, then transform it to another AC voltage then convert it

## 30-520MHz PA output terminated into filter causing power drop

Because this is pretty wide band design I think the PA use a wideband toroid transformer BALUN (and not a microstrip or TL one), and this BALUN doesn't work on wavelength theory. In this case the output impedance of the PA should be pretty constant vs frequency. If is not constant and if it varies with frequency, the only way to solve the (...)

## Designing Regulated Power supply

Hi, i think you found a mistake. it should be: VdcNL = Em = Erms x 1.41; (Multiply instead of divedy by 1.41) Then the formula makes sense. You can confirm it on your given http site with "Step 5: selecting transformer" where the formula is correct. Klaus

## Variable Voltage & Current SMPS

if its for 100watt then 1volt should output a 100amps current and 80v should give 1.25amps by P=V*I so the ouput current must be min 1.25 to max 100amps..... you have to design for transformer for 100W and reduce input current with duty cycle, such that u change the input power. P=1/2*L*I^2*f L is constant f is constant I varies with duty (...)

## Constant Voltage Transformer:Finding Number of turns

Hi to all , First time here.Sorry if posted in wrong section. 103810 across Primary 230V 50Hz input At secondary: capacitor 36 ?F and 60vrms (root mean square) across capacitor Load : 66 ohm .71A 51V secondary o/p = 78v rms PF should be 1. Input and output should be same. Need to find: Wire gauge,Nu

Control signal can be easily isolated by optocouplers, for the isolated power supply, you'll need some kind of transformer based DC/DC converter.

## Help with Hall effect sensor in DC-AC Converter

It's not clear why you would use a hall effect sensor in your design. Output voltage will be primarly kept constant by a voltage control loop. In case you want to use some kind of current feedforward, it could use a current transformer as the output is AC. But if you want a hall effect sensor for some reason, it's output can be interfaced to a

## Stabilizer doesn't stablize the voltages

Hello experts! I have stabilizer at home. It has problem. It gives same output as input. For example, if input is 230v then it outputs 230v, if inputs 210v then it outputs 210v, if inputs 200v then it outputs 200v. Means no stabilizing at output. I think its reference voltage has been missed. Is this could be the problem? Wh

## Three phase rectifier & Transformer VA ?

Hello everyone! This is the situation: A three phase transformer feeding a three phase bridge rectifier. If the output of the rectifier needs a power P. Normaly the VA of the transformer should be P*\sqrt{3} But that doesn't seem logic. There should be a solution where I always use the full power of the transf

## Old educational power supply upgrade.

I'm a high school teacher and have about 16 power supply that i want to upgrade. I repair them all but there is still a problem : they present, on a oscilloscope, ripples with a load and they don't present constant voltage when varying the load. They are very simple construction : 120V to a VARIAC, VARIAC to a transformer (27v AC max), tans

## high frequency output problem

You would get this effect, if the transformers inductance was too low for the frequency/load. Frank

## Invarter charging problem

In Lahore this type of charger are sold with the name trickle charger kit. The kit control the phase angle of the transformer input by sensing the charging current and voltage of the battery. As a result the battery current remain constant and controllable.