# Tag Info

### Why is my inductor behaving like a capacitor?

The supply's power switch is not the way to implement this, since it's on the wrong side of its own output circuitry. That output no doubt consists of a capacitance right across it. Maybe the circuit ...
• 39.7k

### Flyback Diode Forward Voltage

At the instant of commutation (the voltage reversal), the inductor tries to maintain the exact same current flow. It doesn't try to impose a voltage anywhere, it just forces that current through ...
• 39.7k
Accepted

### Flyback Diode Forward Voltage

After it turns on, the forward voltage across the diode will be the forward voltage of the diode at the current that was just going through the inductance. This is a characteristic of the diode at ...
• 409k
Accepted

### Why does the reciprocal of sum of reciprocals relationship appear commonly?

Resistance isn't the only descriptor of the behaviour of a resistor. That same behaviour could be represented by the reciprocal of resistance, which is conductance (usually called $G$):  G = \frac{...
• 39.7k
Accepted

### Calculation of inductance

$µ$ is magnetic permeability(1 in air) Nope. $\mu$ is the product of the relative permeability of the core material (air/vacuum, ferrite, whatever), $\mu_r$, and the air/vacuum permeability, \\$\...
• 37k

### Testing hook-up wires for inductance

If you suspect a wire is not "up to standard", then your method of testing by measuring voltage drop seems quite reasonable. However, determining whether any excess voltage drop should be ...
• 5,640

### If the current through an inductor can't change suddenly, how it can induce voltage in the ignition coil of a car?

According to Lenz's law, the primary coil in the ignition coil will try to continue flowing the current in the same way ... Correct. ... so there is no change in the current's flow. Incorrect. If ...
• 178k

### Output Voltage Drop and Insufficient Current Consumption in a Full-Bridge DC/DC Converter

Based on my research, I believe it might be due to not using an inductor at the output. I would appreciate hearing your thoughts on this. Inductor may seem unnecessary due to the fact that there's ...
• 37k
Accepted

### How does the leakage inductor distribute over multiple coupled inductors?

With a factor like kc=0.9, energy should be low, and bandwidth should be "low" ... You should use "inductor" something like this. Simulated with "AC Analysis" with ...
• 14.7k
Accepted

### How should we calculate L (inductance) value for a transformer

A starting point would be 20 % magnetizing current of your full rated load, in this case 2 VA. At 230 V, that’s 8.6 mA. Z = 2*Pi*L*f. Solve for L. If the transformer would have been 2 kW, about 5 % ...
• 15.7k
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### Skin effect of wires with increasing frequency

For receiver use, don't worry about current handling (as long as it's enough to avoid overheating). Q factor is almost certainly more important. Determine Q from required bandwidth, insertion loss ...
• 40.7k

### Skin effect of wires with increasing frequency

Skin effect increases the AC resistance of the wire, by decreasing the area available for current to flow. This reduces the Q of inductors. It reduces the sharpness and increases the loss of filters. ...
• 169k

### How to know what size diode to use for inductive spiking?

You really should look into Transorbs for this, acronym TSB. Although they have a power ratings, they are designed for short duration surge events. Incidentally they are available in both unipolar ...
• 221
Accepted

### Inductor and capacitor in parallel should not yield resultant current in phase w/ voltage

"Inductive load" here means a load with an overall inductive component to its current in addition to any in-phase current, not a purely inductive load. I.e. a phase angle between 0 and +90. ...
• 20.7k

### Frequency of Oscillators

One thing that stood out to me is that the frequency was usually controlled by an inductor and a capacitor, with a mathematical relation of the form, 1/LC No, that doesn't have the dimensions for ...
• 169k

### If the current through an inductor can't change suddenly, how it can induce voltage in the ignition coil of a car?

The key point is that an ignition coil is a transformer, not just an inductor. While these are composed of similar elements, a transformer has coupling between the 2 windings. Lenz's law doesn't allow ...
• 19.4k
Accepted

### Is this PFC choke design correct?

Your calculations are more or less correct and consistent. The choice or range of options can be improved, however. Don't worry about litz: it's not at all needed for such a low ripple fraction. I ...
• 40.7k
1 vote

### Core Loss of a Transformer

According to the table [above], you can't. If I had to guess, given the high permeability of these types, they are intended for pulse transformer and EMI applications. Pulse transformers aren't ...
• 40.7k
1 vote

### LED driver inductor heating

First, we need to clarify the temperature requirements for the inductor in the project. For example, in an LED product I worked on before, the temperature requirement for the inductor was that under ...
1 vote

### LED driver inductor heating

The recommended inductor is stated (in the datasheet) as: SUMIDA CDRH5D28R-220NC or equivalent The manufacturer's data, including temperature and saturation curves, for that inductor is located here ...
• 409k
1 vote

### Testing hook-up wires for inductance

One characteristic of their non-high-purity-copper hook-up wires is that it has higher inductance that causes significant voltage drop when powering mains AC appliances. Inductance is determined by ...
1 vote
Accepted

### Magnetising Inductance / Primary Inductance

if the magnetising inductance (which the primary inductance) is defined as 100uH then why it is seperated as 100uH and 10mH on the primary ? This is my question. Without the parasitics, a real-world ...
• 37k
1 vote

### Why does the reciprocal of sum of reciprocals relationship appear commonly?

It simply means that the unit you're using for this measurement is the reciprocal of the quantity that you're actually adding. When you put two resistors in series, you're literally adding more ...
• 7,881
1 vote

### Why does the reciprocal of sum of reciprocals relationship appear commonly?

It appears in many contexts, as it's the sum of the harmonic mean of the elements, one of the ways of finding the "most normal value" of a set of values. Typically it's used for rates, such ...
• 15.2k

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