# 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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### How to model the dc link voltage dynamic of the inverter fed induction machine drive in braking mode?

I have been attempting to find the differential equation describing the dynamic of the dc link voltage of the induction machine based electric drive in braking mode. I have started with the energy ...
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### How to mitigate excessive ringing in VDS and VGS

I have a few questions regarding my measurement results in the lab for a double pulse test setup. There are three issues which I want to mitigate . At turn-on interval, there is excessive ringing in ...
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1k views

### How to determine Vds(on) and Vds(off) for switching loss calculation?

In the Infineon Application Note, two of the parameters they've used to calculate the switching loss of the MOSFET are Vds(on) and Vds(off). Is the Vds(off) the blocking voltage? Where do they obtain ...
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### Switching load with changing polarity

From a bespoke board I'm receiving 18vdc that I need to switch. This 18vdc will usually be +18vdc but at times can be -18vdc. The load is .35A. The polarity is being changed via a H-Bridge and ...
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### Inverter EMI filter design

I'm designing an inverter with a switching frequency range of 10-40kHz. The inverter will run off of a DC power supply at a relatively low voltage (30-80VDC) and low power (~100W) for motor control ...
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### Is my IIR implementation (in C) correct for this difference equation?

I recently started developing a digital regulator for a DCM boost (Digital regulator for DCM Boost - How does it relate to duty cycle?) And I've implemented the difference the following controller in ...
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### Need help to identify this IC

I am struggling for about three days now to find the part number for U118. Tried every online database, but I still cannot figure it out. Marking is 14YN/H 891 A981. Any ideas about which manufacturer ...
114 views

### Unequal resistive power splitter

I'm looking at a 3-port, unequal resistive power splitter design like the dashed-line box in the diagram. 1 is the source, whereas 2 and 3 are two loads of impedance, say Z0. All 1, 2, and 3 are ...
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813 views

### Secondary voltage spike in flyback transformer

simulate this circuit – Schematic created using CircuitLab I am using a TNY264 IC to make a custom flyback transformer. (U1 is the TNY264.) The primary to secondary turns ratio is 10 with the ...
246 views

### 2KW - 48V - 240v / 50Hz UPS - Unknown Topology

I am refurbishing a 2kw ups that a friend gave to me. It had failed and had been left in a shipping container on a site and the PCB had suffered some low level corrosion. The PCB is a 2 layer board, ...
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### Alternate uses for Gate Driver - Driving a Load without External IGBT or FET

What issues would one encounter by using a gate driver IC to directly drive a load instead of using it to drive transistors? For consideration would be the very affordable Infineon 2EDN752x series ...
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### High frequency switching applications

I was reading that for high frequency switching applications with semiconductors, the ratio of the electron to hole mobility should be high. Why is it so? Is it a necessary condition always? Or ...
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### Peak Current in Electrical Discharge Switch FET

I am in the process of a designing an Electrical Discharge Machine (EDM) pulsed power supply. Many designs use a power FET to switch the voltage from a supply cap to appear across the spark gap where ...
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### Input/ Output Impedance of Converter/Input Filter (SIMPLIS)

I'm trying to replicate an impedance plot showing the output impedance of the upstream filter and the input impedance of the downstream converter, but within the sample plot. Can I get help with: ...
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### Power circuitry not coming up

I've created a PCB that has two buck/boost converters, the second one being connected to the output of first one. The enable pin of the second buck converter is connected to the PG pin of the first ...
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### Can DAB both step up and step down the output voltage in the same design?

I study this converter through these articles (1 , 2). Attached is the DAB model for LTSpice. I usually see these converters working in buck mode (input bus with constant voltage PFC, maximum output ...
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### What is the purpose of connecting the series capacitor to the low side P- channel MOSFET gate?

The datasheet describes CAOUT as a decoupling capacitor. Not sure how it is so ? My guess on the working of the circuit: When AOUT is high, CAOUT is gradually charged with +(on left) and right ...
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### Asymmetrical Half-Bridge Flyback Converters Simulation issue

I am using SIMPLIS to construct an Asymmetrical Half-Bridge Flyback Converter. Additionally, I am attempting to implement Synchronous Rectification on the secondary side. Please refer to the schematic ...
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### Design of a DC motor controller

I want to design a control system to a DC motor using descrite component and not IC component. At the aim is to control the speed of that motor, but at the first time I want to design the inner ...
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### Ways to Change IPC 4761 Via Type in Altium Designer

I would like to change the via type in Altium Designer in the IPC 4761 section. However, Altium Designer is not allowing me to change it. Is there any way to change it? Moreover, if I would like to ...
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279 views

### Flyback transformer design process review

I was hoping I could get some verification on my flyback design process, and some questions answered. The document I was following is from Fairchild, AN4137, and the steps below essentially outline ...
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### Difference in simulated and measured Eon, Eoff and Erevreq for double pulse test conducted on a MOSFET

I conducted a double pulse test (DPT) on an AUIRFP4568 MOSFET in the lab as well as in LTspice. With the same setup as used in the lab I created a setup in LTspice using the SPICE model of the MOSFET. ...
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### How do I gauge the quality of battery spot welds?

I've built a DIY spot welder for 18650 battery packs. It works fine, but I'm not sure how to evaluate the resulting welds. Specifically I would like to identify when the weld energy is too low or too ...
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### Should I separate power ground from control ground?

I am designing the single phase inverter. The input of the inverter is around 35 Vdc, and output is 24 Vac. The output currents will be below 1A. I control the inverter with F280039C from TI on a ...
147 views

### How to solve the equivalent circuit of the induction motor?

Let's say I have below given equivalent circuit of the induction motor. The parameters $R_S$, $R_{Fe}$, $R_{load}$, $X_M=2\pi\cdot f\cdot L_M$ and $X_L=2\pi\cdot f\cdot L_L$ are known and ...
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### How to calculate the parameters of the equivalent circuit from the no-load measurement of the induction motor?

I would like to determine the values of the parameters of the magnetizing branch of the equivalent circuit of the induction motor based on the no-load measurement. Based on the Electric Motor Control ...
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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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497 views

### How to prevent voltage spike from BLDC motor in ESC circuit

I'm implementing the circuit below by modifying it using STM32 (Bluepill) and adding some decoupling capacitors (100nF) to the bluepill and LM339 with the supply from the battery also connected to the ...
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### Question about filter

I'm studying filter. I saw the filter in book. Therefore, I designed the circuit in the LTSpice for understanding the circuit. However, I do not clearly understand whether the filter is bandpass or ...
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### Modelling of 6xPWM for BLDC

I'm looking to model 6xPWM signals to control a BLDC in Matlab/Simulink. My idea is to utilise the additional "dead-time" that you get with 6xPWM to hopefully better control the motor. ...
163 views

### Induction-heating-circuit doesn't draw any current

I've tried to build an induction-heating-circuit, but it doesn't draw any current from my adjustable transformer, no matter which voltage I give it. I planned to run it from mains-voltage (230V-50Hz). ...
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### Is it true that power supply design is difficult when input voltage range is wider?

During power supply (buck converter) testing, I had seen the lowest efficiency values corresponding to highest input voltage. I thought if the design meets this worst case scenario, it should be ok no ...
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### Are there any discrete ideal diode circuits that can operate from 6V to 130V with less than 0.5V drop @6A?

BACKGROUND: I have an application which will receive power from two redundant DC inputs. The input voltage is nominally 24V but can vary from 6V to around 130V from various transient conditions. I ...
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### Trickle Charge Car Battery / Car GND versus Negative Terminal on Battery?

I have a few cars that don't get driven in the winter, and I am going to keep hooked up to a trickle charger to charge / maintain the 12V lead acid batteries. In reviewing the trickle charger ...
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### 1.8kVdc to 700Vdc voltage dropper

I'm trying to get some ideas for dropping 1.8kVdc to 700Vdc using simple voltage dropping techniques/topologies. I am using a SMPS (Switched Mode Power Supply) to regulate the low voltage outputs from ...
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### SMPS troubleshooting (unable to provide enough current)

Recently I found one of my SMPSs (a laptop power brick) malfunctioning, what happened is - it provides enough voltage as declared, but it can't sustain at the mentioned current even at short circuit (...
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### Can arcing in IEC 60320 C13/C14 connectors damage a device?

I have a 'guitar effects power supply' built to supply 9v/12v/18v power to 🎸 guitar effects pedals. It is powered using a IEC 60320 C13/C14 power receptacle and cable. After using this device for the ...
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### C code for the space vector modulation algorithm

I have been developing a C code for the space vector modulation of the three phase voltage source inverter. I have studied the SDK109 (page 93-109) and Digital Control in Power Electronics (Simone ...
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### Three-phase rotary converter wiring questions

I am installing a 30 HP three-phase rotary converter on a 200 amp service in my home shop. I intend to run a CNC milling machine with a 15 HP motor. I am using 2 AWG wiring in 1" shielded conduit ...
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857 views

### How to ground a flyback transformer?

I designed a 50,000 volt power supply, that I am having problems with on grounding the HV side of the output. The HV appears to be injecting HV into my logic sections through the ground, damaging the ...
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### TL494 current limiting without current sense

Is it possible to limit the current without using current sense feedback in TL494?? The TL494 have two amplifier both of them sensed only voltage (12V_A & REF) from buck regulator and TL494 limit ...
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### Generating +65 V (positive) and -65 V (negative) voltages from two 12 V batteries using cheap step-up converters?

I need to power a 300 W class D amplifier with positive and negative 65 V. As I'm a do-it-yourself guy, I didn't know about positive and negative voltage and ordered a bunch of these normal step-up ...
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1k views

### TRIAC driver circuit behavior when switching low current loads

I'm doing a project that involves switching different kinds of loads (edit: by that I mean loads that go from just a couple mA, up to 5A or so) using the usual TRIAC + opto-isolator combo (in my case, ...
177 views

### Powering buck converter using charged capacitor

Is it possible to design a buck converter using a charged capacitor to get regulated voltage output? When the capacitor voltage falls below some threshold value the inductor should be able to provide ...
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### Switching between power sources with microcontroller

I need a way to switch a load(a high power LED) between two different power sources(50v and 100v) using a logic signal, quickly(<500us) and repeatably. I was going to use an n-channel high side ...
558 views

### Methods for increasing output power and efficiency of a ZVS flyback driver

I have built the following ZVS driver: I am using this circuit at a resonance frequency of 150kHz. My hope is to be able to modify this circuit for wireless power transmission. With that being said, ...
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### How to connect Electret Microphone module and OPAMP?

I am trying to build a circuit that gets electret microphone input and maps into 0-1V for utilizing in ADC. The microphone module suggests using such circuitry When I tried that circuit and talked ...
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### Can a Capacitance Multiplier be used with high voltage outputs?

I am designing an SMPS which two output voltages of 5kV and 2.5kV. My transformer is split into four equal sections, each feeding a FB multiplier, connected in series to form the final voltages. ...
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### Bipolar transistors that only connect via base to emitter

I am trying to understand how to use this configuration of the LTC2992 power measure IC and the only part I am confused with so far is the two transistors which I have circled. What I know so far ...
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