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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Can I charge laptop with wire 20awg
My laptop has a maximum power is 170W, 20V, and I often use it with max power.
My adapter has a broken power jack and I must change the wire that supplies power for the charge.
I use wire 20awg, the ...
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Exam question - What should i understand from them
im studying DC power converter for exam,
mainly the 4 converters are
boost (step up)
boost (step down)
buck boost
cuk converter
question is should i memorize all the continuous conduction mode CCM ...
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Intrinsic safety connection protection between two intrinsic safety devices inside a hazardous zone
I am designing an RF module in in a hazardous zone (in the picture it is shown with DCDC and MCU etc.) My module gets power supply from AC/DC.
I read about intrinsic safety barriers from the IEC 60079-...
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What would happen if we never included the additional diode on the secondary side of a Forward Converter?
simulate this circuit – Schematic created using CircuitLab
In the schematic above I say additional diode because I considered that the Forward Converter is an isolated version of a Buck ...
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Damaged C17F SOT-23-6
Can anyone help me with identifying this IC? I have no idea what it is. I ordered one, but got a 5-pin one instead. It is from a hologram fan blade.
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Full wave rectifier behavior
This is a center tapped full wave rectifier. From my understanding if D1 = forward bias and D2 = reverse bias during the positive cycle of AC, why does VD1 from the graph show 0 voltage during the ...
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How can I isolate an AC/DC high-frequency signal of up to 200kHz?
How can I isolate an AC/DC high-frequency signal of up to 200kHz?
The signal to be isolated ranges from +/-5V and can be AC, DC or a combination of both.
Preferably can it be achieved using isolating ...
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Electrical Conductivity of SAC solder
Can anybody help me find the electrical conductivity of SAC 305 (96.5Sn3Ag0.5Cu) solder? It is the most common solder in semiconductor IGBT/MOSFET power switches.
Many thanks and best regards,
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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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Could a Mercedes sedan powered by 9,648 AA batteries reach 52 mph?
Saturday Night Live's hilarious Mercedes AA Class skit (non-US link) showcases a Mercedes luxury sedan supposedly powered entirely by AA batteries:
But, as an engineer, I can only ask: would a car ...
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Connecting a capacitor to a voltage supply in series without a resistor
When connecting a capacitor directly to a voltage supply (without a resistor), is it correct to expect a surge in current at the instant when the capacitor and the battery are connected, then current ...
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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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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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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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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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Why does my square wave signal from an Elegoo Uno R3 have 3V overshoot/undershoot?
I've just purchased my first oscilloscope, a Siglent SDS1202X-E, and am experiencing an issue with a square wave signal generated from an Elegoo Uno R3 board. I've calibrated the probes, and I'm quite ...
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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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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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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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VT vs RVT capacitors: what do they mean?
I see on these two products, which have the same function (and obviously also the same construction; these are switches which allow activating/deactivating individually the power supplies of one or ...
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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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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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H-bridge inverter with phase shift control
I am trying to apply phase shift control to my H bridge inverter but I get these spikes in the picture I don't know why. And it getting worse if I apply inductive load
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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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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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Resistor values for a voltage-controlled current source circuit
simulate this circuit – Schematic created using CircuitLab
During my bachelor thesis, I am learning IGBT gate driver circuits. I am struggling with understanding the following circuit. It is a ...
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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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How damaging are inrush currents?
Typical power supplies will have 30 to 100 amps inrush current at 220v, sometimes less, sometimes over that. How is it that the power strip rated at max 10amps at 220v doesn't get damaged?
Also, if I ...
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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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Thermal runaway in resistive elements
I'm working with some 230 VAC resistive heating elements which are switched by a solid state relay (https://uk.rs-online.com/web/p/solid-state-relays/9045728) and driven by a 4-20 mA signal from an ...
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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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Reactive power compensation through grid connected inverter
I recently designed a bidirectional DC-DC charger for an Electric Vehicle (EV) battery.
I would like to focus on the inverter control. In this application, I designed the inverter to have unitary ...
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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 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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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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Switch module test circuit design
I am doing a project to make a test box that would test the switch module in the photo below. Please see circuit diagram below for inside of the switch. Please note this switch is not an ordinary ...
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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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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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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 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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Find equivalent of a destroyed IC (voltage regulator?) - top marking 3P=4G 50Q
I’m trying to replace a damaged IC due to accidentally short circuit. But it seems like it’s impossible to find original one. How could I find an alternative?
What is 3P=4G 50Q?
Photo showing more ...
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What is the reason why thermal aging affects only the Cds capacitance but not the Cgs or Cgd capacitances?
Please take a look at the following images, experimentally obtained from a power cycling test of a power MOSFET. After the test where thermal aging is created due to repetitive power cycles, it is ...
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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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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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