Questions tagged [shoot-through]
32 questions
14
votes
2 answers
Why doesn't shoot-through occur on totem-pole structure?
I'm designing a totem-pole by BJTs in order to drive a MOSFET. I studied on several online examples and built up my circuit according to what I understood from them. However, there is a detail which got stuck in my mind. I would like to know why…

hkBattousai
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3 answers
Why can't I get rid of shoot-through in my half-bridge circuit?
I am building a class D amplifer and I have getting shoot-through despite my best efforts to mitigate them using dead-time, miller clamping, and using high V_GS_threshold MOSFETs.
Here is the circuit on LTspice:
The problem occurs when the high…

Random Burnout
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7
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4 answers
Rail to rail +12/-12 V square wave generation with microcontroller
I need to generate a +/-12 V square wave, +/-0.4 V tolerance is allowed. The purpose is to drive the pilot signal of an electric vehicle level 2 charger, for those curious.
EDIT (clarification): what I'm trying to design here is the EVSE controller…

jamarju
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7
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2 answers
Will this simple four n-channel mosfet H-Bridge Circuit work?
This is my H-bridge circuit without considering Back EMF. In the real circuit I would put four fast recovery diode to eliminate the Back EMF.Maybe schottkies?
Before I came up with this design , I googled "DIY H-Bridge". And I only found out…

Frank
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6
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3 answers
Why there is no shoot-through in CMOS logic gate?
This picture is shown on Wikipedia.
From my understanding of shoot-through, I think this circuit will shoot-through every cycle of pulse and destroy itself.
Will it shoot through or are there any hidden elements to prevent it?
Can I make discrete…

M lab
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5
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Synchronous buck converter using DGD05463 gate driver: High-side gate goes high while low-side is also high --> Shoot-through
I am working on a synchronous buck converter design using the DGD05463 gate driver. The schematic can be seen below (the inductor is 4.7 µH). The input of the driver gets driven by a 400 kHz PWM signal with varying duty cycle. The output is loaded…

Fr4nky
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4
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1 answer
BLDC Motor Driver Losses
That was a pdf when originally uploaded, but am now going to try to zoom in on the sub-circuits. Please let me know if there's a better way to do this.
I'm trying to make a PIC-based BLDC motor driver but am drawing ~0.5A even with no motor…

tarabyte
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3
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1 answer
Gate spikes in half-bridge IR2110 driven
Some time ago I posted a question about weird oscillograms of half-bridge, gate spikes on mosfet openings. After some investigation, it was revealed that the problem is not in transformer leakage inductance. When the upper or lower MOSFET is turning…

Erch
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3
votes
3 answers
Shoot-through inside gate driver ICs
We are driving a piezo transducer array with sub-1 μs pulses at an extremely low duty cycle. A single N-channel power MOSFET drives each transducer. Each power MOSFET transistor has a low side gate driver (FAN3229T) ahead of its gate to slew it…

jimolson
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3
votes
3 answers
MOSFET High Side conducts when low side switches in H bridge circuit
I have designed an H-bridge circuit using IR4110 Mosfets.
Q1 and Q4 are OFF, Q2 and Q3 are conducting. Gate of Q1 is left floating. Q2 being high side, its gate is connected to Vcc + 12V. The gate of Q3 is connected to a PWM signal (12V square wave…

Winner
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3
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3 answers
H-bridge tiny spike?
My high and low side gate measurements to GND show a tiny little shoot through spike.
Adding dead time, Zener bypasses over R(g) and from G-S, and TVS diodes does not do anything.
The load is 100K and it's running off 12V supply. Any ideas as to how…

ARMATAV
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2
votes
4 answers
Is dead time needed for a MOSFET?
Is it necessary to implement "dead time" (anti-shoot through) for MOSFETs? F=50kHz

arduplay
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2
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BJT h-bridge shoot-through problem
I made an H-bridge using this schematic:
Although the circuit mostly works fine, there is noticeable shoot-through.Even with no load at 150-200hz the input voltage drops by a lot.I added dead time of 30us which seems to help, but does not solve the…

Kostas Sarioglou
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2
votes
1 answer
H-Bridge shoot through at high voltage problem - Don't know the cause
I have this H-bridge circuit
The circuit is for driving a 180VDC motor, it is built to taking in the High Bus voltage from 169VDC to 340VDC. it works with no problem up to 310VDC. However, at 340VDC, the High and Low side FETs (depends on which…

AlexT
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2
votes
1 answer
Freewheel diodes and shoot-through prevention required on this low-voltage H-bridge?
I have built the following h-bridge:
VMOT1 is at logic level (3.3V)
FWD and REV are driven by MCU (no PWM in the scope examples given)
Q7/Q8 are DMP1045
Q9/Q10 are BSS138
D3/D4 are 4 x 4148
the 2 voltmeters are the color-coded scope probes with…

Genoil
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