# Questions tagged [power-electronics]

Refers to the conversion of electric power by using solid state components such as semiconductors. Can also generally apply to the field of electrical engineering which works with power electronics.

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### Switching Losses In a Power Supply

Switching losses calculation in resistive load and inductive load are different. For a full-bridge dc-dc topology with a resistive load at the output; Should I calculate my switching losses like I ...
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### How can negative feedback reduce distortion if A*beta>>1?

I have read that negative feedback reduces distortion (frequency, amplitude, phase) because if $A \times beta >>1$ the transfer gain will be $(A/(1+A*beta)) = A/A \times beta=1/beta$. Which ...
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### 220 hot water heater wirring to outside breaker box [closed]

I'm installing a new hot water heater . The people before me wire up the hot water under the floor instead of running it through the wall to the inside breaker box and a animal eat the wiring. So I ...
2 votes
1 answer
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### Converting 1-5Hz from linear generator into 60Hz

My senior design project is a linear wind generator that's modeled after the Wind Vortex Project. I've been looking for a way to internally increase the frequency of my generation subsystem from my ...
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### What decides the amount of power being drawn by a heating element?

I'm trying to understand the basic concept of how such electronic equipment works. For example, if I have 220V 10A power line, when I plug a heating element into it, will it take all available power? ...
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### Why do I get this output voltage? Push-Pull converter

I am expecting a push-pull converter behavior from this circuit, but I can't figure out what I am doing wrong here. I am using the free version of SIMetrix/SIMPLIS The output looks like this, a flat ...
6 votes
3 answers
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### How can a reed switch be used for high current applications?

I am planning to use a reed switch as a power switch in my underwater robotics project. The switch will be placed between the LiPo battery (16.8V, 20.8Ah) and the load. The load mainly consists of two ...
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### Looking for a good text book describing active clamp forward converter

Can anyone refer a standard text book for understanding Active-clamp forward converter in detail? I could only find application notes and datasheets on this till now. I have gone through below books- ...
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### how to map 1V - 10V to 1.6V to 3.2V for voltage regulation using TL494

I am trying to design the given circuit where pin 1 is the non inverting terminal of comparator where I want to use a ref voltage of 1V - 10V but IC TL494 is accepting a voltage of 1.6V to 3.2V....and ...
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### Is there any method to turn any PWM DC-DC converter to its small signal model at circuit level?

Is there any method to turn any PWM DC-DC converter to its small signal model at circuit level? As I know the PWM switch model does that well but it only applies to simple circuits and the switches ...
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### mosfet to protect reverse plarity from a power suply range 10v-18v DC [duplicate]

hello I have designed a board that operates on 10v to 18v DC (2A) I need somehow to protect it from reverse polarity, am thinking to use MOSFET but how I can drive the gate in 10v-18v range
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### LLC resonant capacitor RMS voltage and output capacitor ESR calculation [closed]

I have a question about the TI LLC document. On page 25, Select the Resonant Capacitor, I don't understand why it can use this formula to calculate the RMS value. Could someone tell me how to get this ...
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### Would noise in general mean AC components only ? Is DC noise possible?

Noise refers to the unwanted disturbance in an electric signal. Would there be a DC Common mode noise? I guess it is not possible to have DC common mode current, let alone noise, as it doesn't have ...
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### Does skin effect increase the eddy current losses inside magnetic core?

From wikipedia -Ref1 The skin effect also reduces the effective thickness of laminations in power transformers, increasing their losses. From eddy current article in wikipedia-Ref2 "Eddy ...
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### Connecting sets of pc fans to a 12v battery

I am very new to electronics so please understand. I have researched but need clarity. Basically I need to create a mock intake/outake exhaust system using recycled pc fans. Now I have to power it ...
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2 answers
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### Would increasing the load resistance in a buck converter increase efficiency?

I was recently asked in an interview if the efficiency of a buck converter would change based on changing the load resistance (I assumed this meant constant input and output voltage). I answered that ...
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### Calculation of series circuit elements

I have a series circuit. Should it be true for this series circuit if I true to write like: ...
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1 answer
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### How do I calculate the potentiometer value for the controlling of Alpha angle of a phase control IC? [closed]

The datasheet suggests to use a 10Kohm pot to control the Alpha angle, however no matter how much I try I can't control it. I used 1Mohm pot instead and now I can control it more, but still with very ...
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2 answers
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### If we change the PV panel, should we also change the MPPT controller block?

I have 6kw PV panel, in case of partial shading it's capacity reduces to 3kw. But, the MPPT tracker I designed it specifically for that 6kw rating, now because of partial shading the same MPPT tracker ...
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### Can I wire a 220v 15amp outlet in the US? [migrated]

In Brazil I have visited a number of cities where every house is wired with 220v. This is a FULL 220v between the Live and the Neutral, plus the Ground wire. Very different from the 220 in the US ...
-1 votes
1 answer
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### Trouble using PNP as a switch

I simulated a circuit as shown below and it works as expected when the switch is closed or opened. I later change the 2n2907 to FMMT591A due to availability, continuous collector current and size. I ...
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### When I connect a battery, the system fails

I have a standalone PV system with boost converter using perturb and observe (P&O) as the MPP algorithm. The values of input, output capacitors, inductor are calculated correctly based upon a ...
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### How to asses the performance of an MPPT algorithm?

I have a standalone pv system with PV Panel rating 6820W, a buck converter, 12V battery , DC resistance (load) of 8 ohm with Perturb and observe (P&O) as the control algorithm. Upon simulating, ...
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### Design or selection of a capacitive-load soft start circuit

A circuit to soft-start, a.k.a. slew-limit, the charging of a 220 uF capacitor Cf at a maximum current in the neighbourhood of 300 mA. Cf is a filter cap preceding a further SMPS stage. My plan so far ...
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### Relay Replacement (Datasheet Questions)

I need to replace the following relay: 941H-2C-5D The datasheet can be found here: https://datasheet.lcsc.com/lcsc/Hsin-Da-Precision-941H-2C-5D_C259268.pdf From what I understand from this datasheet ...
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### Can anyone explain the role of some of these blocks in this PV inverter system?

I get the role of following blocks: 1)MPPT controller (is a matlab function code of Perturb and observe) 2)boost converter 3)H-bridge inverter and its PI controller. I don't get the role and working ...
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### What's the purpose of the Zener diodes in this boost circuit?

I am looking at this boost converter for stepping up voltage to charge a Li-ion battery: It looks like a standard boost topology, but I am new to this and am wondering: What is the purpose of the ...
2 votes
1 answer
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### Why aren't smoothing capacitors used in smoothing the output of fully controlled bridge rectifiers?

I was wondering why smoothing capacitors are not used in smoothing the output of fully controlled bridge rectifiers, like it is used in the uncontrolled bridge rectifiers.
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### Power path sharing with LTC4416

I am struggling with the LTC4416 datasheet. My need is a 4-cell Li-Po battery (13.6..17.2V) used as the device battery and an optional external power supply (18..24V). When the external power is ...
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### PI simulation in PathWay ADS

I am trying for Power Integrity testing for a computing module which uses two Buck converters, whose output goes through a VC sensor measuring the power on each line. The VC sensor uses 2mOhm ...
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2 answers
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### H-Bridge with highly inductive load

I am trying to understand the H-bridge, I have edited the circuit and followed the advice in this thread. Is this a good H-bridge design for excitation of the magnetic core which is highly inductive ...
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### P Mosfet Drain Supply

All most of the tutorial talks about MOSFET as a switch. But I want to know about the behavior of P MOSFET. When I apply positive terminal of the supply to the Drain and check the voltage against ...
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### High side MOSFET gate driver for pure DC application (non PWM)

I want to drive a highside MOSFET which is supposed to be on for hours. I tried TI's approach of using a 555 timer and IR2110 but from my simulation on LTspice, the outputs at the HO pin of the ...
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### Automatic Switching of 2 Power supplies [duplicate]

I do have a main supply 5V from an adapter along with 5V backup Li-ion battery. So if the power goes off, ie. if adapter power is not there supply should switch to backup without any delay. How can I ...
2 votes
2 answers
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### How would you generate a negative rail of -50V with a current of 100mA using a positive 50V generated by a battery powered boost converter? [closed]

Please I really need suggestions on this. I want to generate a -/+50V dual-rail at >=100mA supply for a circuit I am working on. I bought 2 copies of this boost converter module from Amazon and it ...
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3 answers
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### Can this resistor be replaced by a wire or fuse?

My power supply got broken. Upon further inspection, I found out that the high power resistor (15 ohm, 10 W) was broken. Unfortunately, I can't purchase such a resistor (with the same specifications, ...
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### What affect peak current in an RL load rectifier circuit?

so I'm running a half wave RL rectifier in simulink. I don't have much knowledge. May I know what affect the peak current in the half wave rectifier circuit (the theory behind it) and how do I ...
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### Using H-bridge gate drivers to drive MOSFETs in non PWM applications

I am using IR2110 to drive a highside MOSFET which I intend to use to control the charging of a lithium ion battery (disconnecting it from the charger once full). I am not using any PWM control ...
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### Would the schematic below be considered a half wave or a full wave rectifier?

Would the schematic below be considered a half wave or a full wave rectifier ?
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### In a forward converter, why do we need a separate controller for secondary side switches?

LT8311 IC is said to be a synchronous controller IC for a forward controller. Why do we need a separate controller at secondary side as the PWM pulses of primary side should dictate the synchronous ...
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### I need help with PWM filter capacitor current calculation

PWM filter capacitor current calculation. I am trying to select the capacitor for the PWM filter shown below. That being the case, I need to calculate the total current (fundamental + harmonics) ...
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### Power Supply board - PMBus "Digital Power System Management" vs multiple components

I'm trying to design a PCB which will take a ~28V input (perhaps 1.5A, although can increase if required) and provide 6 (ideally, might reduce for size constraints and then duplicate the board) ...
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### LTspice giving weird results in simulation of phase shifted full bridge converter

I am trying to simulate a phase shifted full bridge converter in LTspice. I had already simulated it in MATLAB Simulink and obtained the desired results, but I am redoing it in LTspice to include the ...
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### How to model solar photovoltaic array in spice?

This is the circuit I need to simulate in KiCad and ngspice. simulate this circuit – Schematic created using CircuitLab Can I encapsulate the above circuit into a variable in ngspice so that ...
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1 answer
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### Need help with simulation of three-phase active rectifier on LTSPICE

I have already successfully simulated a three-phase rectifier on simulink. However, I wish to implement the same on LTspice because I would have liked to see the effect of using non-ideal components. ...
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1 answer
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### Flyback diode rating questions

I'm currently working on a magnetic levitation project which revolves around levitating an object below an electromagnet. This was inspired by a magnetic levitation project that I found online. The ...
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### How do you determine that a MOSFET needs a gate driver as logic levels are not good for it?

I'm using an IRF620 MOSFET paired with a TC4420 high speed gate driver. Just using the MOSFET by itself with the Arduino does not work properly. It works a lot better and faster with a gate driver. ...
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### Problem with SPIRIT1

I am working in a design with the SPIRIT1 for RF communication: But many of them are working wrong, it looks like the SPIRIT1 dont biased correctly by the pin 14 and its inductors, has somebody work ...
2 votes
1 answer
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### Question regarding connecting LISN to a three phase PFC

I am trying to connect a Line Impedance Stabilisation Network (LISN) to a three-phase PFC rectifier simulation model as I want to simulate the common-mode and differential mode EMI. Most references on ...
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### How to choose correct water pump for my hydroponic vertical farm

I am building a hydroponic vertical farm. I have 3 shelves and every shelf has one pipe. Also, I have two motors which are HX6540 and HX2500. Since HX6540 is very powerful, it fills the system very ...
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