Unanswered Questions
757 questions with no upvoted or accepted answers
4
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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 ...
- 1,113
4
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155
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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
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At turn-on interval, there is excessive ringing in ...
- 39.6k
4
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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 ...
4
votes
0
answers
53
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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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4
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479
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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 ...
- 198
4
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105
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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 ...
- 14.5k
3
votes
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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 ...
- 41
3
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106
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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 ...
- 131
3
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77
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Need help in selection of FET for transfer gate
I was studying the variable potentiometer X9C10x series. They are using a series of fixed resistors and some FETs to select points in this series branch. I need one variable point in my circuit. Can ...
- 903
3
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776
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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 ...
- 121
3
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243
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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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89
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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 ...
- 711
3
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answers
135
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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 ...
- 171
2
votes
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answers
48
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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:
...
- 180
2
votes
2
answers
140
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Half-bridge on-time positive current slope details
As shown in the LTspice simulation, I am trying to build a simple HB converter. When the HS is ON, the current increases with a positive slope ((Vin/2)/Lm). After that the Lm current continues with a ...
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