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.
3,065
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Optimization of gate resistance value for gate driver circut of a SiC MOSFET
I am struggling to tune in the RG_on and RG_off values of gate resistors for SiC MOSFET. I have tried a lot to tune in the values but at turn off transition there is persistence high frequency ringing ...
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Why are MOSFETs called voltage controlled devices even though we have to push in charge/current to charge the input capacitances?
I was wondering why MOSFETs are called voltage controlled devices when the input capacitances of the MOSFET (Cgd and Cgs) need to be charged in order to turn ON. Wouldn't that mean that they are ...
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Problem with the output of a synchronous non-inverting buck-boost converter
I found this electronic circuit in an old research, along with the code necessary to operate it. When I applied it in the laboratory, the results were not the same as in the original research, not ...
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Changing gate turn off voltage of SiC MOSFET from 0V to -4V
The design of sic gate driver circuit is designed to work at 0 V as gate turn off voltage. Due to some undamped ringing at turn off, I want to change the gate turn off voltage at -2 or -4V which is ...
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Design Suggestions for an Optocoupler Relay Module
I have designed this module to operate with input voltages of 5V and 3.3V (common in most MCUs). Additionally, I have equipped it with an optocoupler to isolate the MCU from the power section of the ...
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Flyback converter simulation in LTspice: discrepancy between Switching model and Averaged Swicht model
I´m trying to make a Averaged Switch Model of a flyback converter for transient and AC simulation in LTspice. I´m following the document "Advances in Averaged Switch Modeling and Simulation" ...
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AC outlet of 78,000 mAh power station stopped working [closed]
The AC outlet of my power station that I use to charge my laptop, phone and other little gadgets stopped working.
I mistakenly connect a handheld hair dryer to it and since then, the AC outlet doesn’t ...
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Back-to-back PMSG based wind turbine
We have a PMSG based wind turbine with back-to-back converter. Now, the Permanent magnet provides a rotating magnetic field. So, how does the reactive power exchange happen between converter and grid?
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Wind turbine: Back-to-back converter DC link
In the Type 4 topology of wind turbine generator, we use a back-to back ac/dc/ac converter in PMSG based wind turbine. Why do we need a dc link? Why cannot we simply use a cyclo-inverter instead of ...
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Single Phase Active PWM Rectifier using MOSFET
I am using this H-Bridge Configuration to make active PWM rectification to control the output average Voltage by controlling the Modulation Index.
Here is the circuit diagram and the pulses of each ...
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Adding a Resistor and diode on to my PCB without doing re layout [closed]
I have a question regarding adding components to the PCB which are not laid out in pcb layout. I want to add a diode and a resistor in parallel with gate resistor of a MOSFET in order to mitigate the ...
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Grounding in power electronics
I'm designing a three-phase inverter and have been looking up information online with respect to grounding, which led me to a somewhat misapprehension.
In my system I firstly planned on separating the ...
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Best way to go from 5V to .95V to power an FPGA at max 15A
I need to power the core voltage on an FPGA from a 5 volt supply with a lot of constraints.
This is a rad hard environment so many components are ruled out. I'm only able to find a SMPS that will go ...
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How does this PNP transistor and P-channel MOSFET circuit work?
How does this PNP and P-channel MOSFET circuit work? How does the current flow? What are the voltage potentials at the nodes A, B, C and D?
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I keep blowing my resistor R3 on this part of the circuit [closed]
My 180 ohm series resistor R3 keeps blowing as soon as the circuit is switched on. I have tried to use a higher power rated resistor or two parallel resistors, but no change. Can anyone please explain ...
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How is clearance and creepage considered in this case? [duplicate]
I'm making a high voltage PCB where there are 2 grounds - one is HV ground (HV-) and the other is the microcontroller ground which is isolated. HV+ is at 100VDC. How do I consider the clearances and ...
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Clearance and Creepage for the Nets
I have made the schematic of the double pulse test setup and have also highlighted the NETS for the PCB layout. Test will be done at 100VDC (HV+) and current ~ 30A.
Please suggest where the clearance ...
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Electronically activated circuit breaker
I want to be able to disconnect the load from a circuit, which may be of variable amperage, possibly up in the hundreds.
I guess what a normal person would do is probably use a contactor of some sort. ...
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If the current through a welder is hundreds of amps to melt metal, how does the welder circuitry cope
A pretty simple question but i have no idea. My logic is if the current is so high where something as low resistance like a metal slab can be heated to melt. How on earth does the components in the ...
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How to decide the number of layers? [duplicate]
I am new to PCB design and I want to understand how exactly we should select the number of layers. I just know more layers helps us with making the routing easy but I don't understand what is power ...
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Circuit help power electronics (HEIDBC topology)
I am currently designing a power electronic circuit which operates in step-down mode and it has single input, multiple outputs. The input is 200 V DC and the outputs are 15 V (R1) and around 25-29 V (...
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How to decide number of layers?
I am new to PCB design and I want to understand to understand how many layers to choose. I just know more layers helps to make the routing easy but I don't understand what is power plane, ground plane ...
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Boost converter output instability
I'm currently working on a DC-DC boost converter project and encountering this issue where the output initially peaks but falls back to the input voltage. My desired output is around 140 V.
I'm using ...
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How to wire two DPDT relays in parallel?
I need two DPDT relays in parallel. They both should switch at the same time. I would connect 2 with 2 and 7 with 7. Is this correct?
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How do I calculate time from pulse width?
I am looking into the LL4148 datasheet and notices the IFSM is rated for 1A @ pulse width = 1s and 2A @ pulse width = 1us. The goal is to calculate the energy pulse using E = IVt.
The current and ...
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Double Pulse Test setup layout consideration
I am new into PCB Design and wanted some suggestions for the layout for double pulse test.
Regarding placements of the components (inductors, capacitors, gate driver, MOSFETs)
How many layers? 2? ...
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What is the difference between voltage mode control and current mode control for SMPS? [closed]
What is the difference between voltage mode control and current mode control for SMPS? I also wanted to know what kind of modelling techniques are used model these controls (i.e. average models... etc....
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Which is the more important switching parameter in MOSFET datasheet? Turn on/off/delay times or Input/Output/Reverse capacitances?
I see both capacitance and timing details mentioned in the MOSFET datasheets.(Ref:)
Which one should be considered for comparing the MOSFET switching performance between 2 MOSFET part numbers?
Note: ...
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12 VDC to 24 VDC conversion for PLC input high signal [duplicate]
I have Siemens S7-1200 PLC DC/DC/RLY. It takes 24 VDC inputs. One of my inputs to PLC is 12 VDC. I want an intermediate circuit that converts the 12 VDC to 24 VDC. Moreover, I have a 24 VDC source ...
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Checking PCB Layout, Routing Tips and Improvements?
I've made some significant revisions to my old PCB design and wanted some advice on routing! This time I've tried to properly space the large current/voltage traces, kept traces short where possible, ...
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Can we sell 110V equipment without NRTL certification in a US market?
Only in some places.
Weight scale product
certification
NRTL
110VAC
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High power dc/dc converter (or voltage clamping) with high source impedance
Short version:
I have a DC voltage source (adjustable up to 750 V 60 A) that is powering our robot which expects 320 V nominal (never exceed at 360 V) and can consume up to 30-35 A (but only 30 mA ...
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H-bridge output voltage ripple
I have built this H-bridge. I have a problem with the output ripple. I have used an RC snubber circuit (10,30,50 and 60nf with 5 ohm,) but still have the same problem. I checked the gate signal. It is ...
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Choosing the right current sensor for the PMSM motor drive application
I have a 400W PMSM motor. It has a rated current of 2.4A with 3000RPM and 108V. The motor datasheet says that it can go upto 4500 RPM with load current of 4A. The motor is HG-KR43. Now I want to read ...
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Can I convert 12 V DC to 24 V DC using a 2N2222A? [closed]
I have a circuit which generates a 12 V DC high pulse when a laser is detected. I want to convert this high pulse to 24 V DC to feed into a PLC input (Siemens S7-1200.) Can I do this using a 2N2222A?
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If the chassis is at high potential and a human touches it, will he get shocked? The proposed circuit is for the cancellation of CM current
This circuit is compensating the potential difference between the chassis and motor so the bearing current or leakage current cannot flow from motor to chassis to ground.
If the chassis is at a high ...
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PCB layout, any improvements to make on the routing?
I have designed the PCB below and would like some advice on good practice for my PCB routing / board schematic. Are there any design considerations that I should be paying attention to for the design?
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Confusion in number of turns and strands in flyback transformer
I am designing my own discontinuous mode flyback transformer and am following the book Transfomers and Inductors Design Handbook by Colonel. Wm. T. Mclyman. I have used all the equations of the ...
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3 phase 4 wire inverter output common mode choke selection
I designe and develope a stand alone 3 phase four wire inverter that it works with unbalanced output currents. The standard 3 phase 3 wire inverter output are used common mode choke like this (RB6132-...
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How to generate 0-150V adjustable DC output? [closed]
I wish to generate a voltage range of 0 - 150V output @ 2A Max to drive an actuator, and I don't really have a lot of great ideas at this point.
I have 2 power sources available, one is 220V AC, ...
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Can anyone help me write a program in Python to output 5V from a USB port to control a relay? [closed]
Can anyone help me write a program in Python to output 5 V from a USB port for only 2 min and then off for feeding a relay using only the power wires of the USB cable and without using an Arduino?
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ZMPT101B module producing VDC even with AC source disconnected
I am trying to use ZMPT101B to measure 110V AC but even after calibration and using multiple sketches when I power off my AC source it measures some AC voltage (or in other words a signal is still ...
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In aircraft power supply, why is the neutral not connected to chassis GND unlike household utility power?
Usually the chassis of any household equipment is connected to earth ground for safety.
Part of the culprit is neutral being connected to Earth ground. (Reasons are mentioned in this post.)
My ...
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EMI filter attenuation requirement for a buck converter given EMI compliant AC-DC converter
In my application I have an off the shelf 600W 72V AC-DC converter that generates the main DC bus that powers a custom board that houses a 72V input, 9A output buck converter switching at 330kHz. A ...
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Control manipulator mechanical arm by infrared
I want to make an infrared control circuit (remote) connected to the Manipulator Mechanical Arm. I found this circuit, but the outlet is 230 volts, and I do not think that the arm will handle this ...
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Do we really need the metallic chassis to be grounded if it is coated with a non-conductive paint?
As per my understanding, a metallic chassis can result in a shock only if two failures happen simultaneously:
Live wire ('hot') insulation wears off and gets in contact with chassis.
Chassis outer ...
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Inductor based or switched capacitor DC-DC converter for given load parameters for mouse's headstage
For my master's thesis project, which focuses on designing a control loop for a DC-DC converter in the receiver of a resonant inductive coupling system to handle significant and unpredictable ...
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Why do amplifiers have minimum frequencies?
RF amplifiers, both power amplifiers and low noise amplifiers, are rated with a minimum and maximum frequency. For example, the Analog Devices HMC517LC4 Low Noise Amplifier has a frequency range of ...
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What connector pin header can I use for high voltage?
I am making a PCB for a double pulse test setup. What connector pin can I use on my PCB to connect a high voltage DC supply for the HV+ and HV- connections?
Voltage ratings: 100VDC and 800VDC.
The ...
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Kicad telling me to connect pads together when I feel it's incorrect
Hey all I am wondering if this is the correct way to trace a fuse holder on my pcb. I would imagine that the top 2 pads connected to each other and the bottom 2 pads connected to each other. Running a ...
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