Timeline for H-bridge topology question
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Jun 20, 2019 at 16:10 | comment | added | D.A.S. | An IC with Hi/Lo gate drivers is better than sharing Nch,Pch half bridge gate signals. FWIW @Sieben | |
| Jun 20, 2019 at 16:09 | comment | added | D.A.S. | In this i.ibb.co/0ccvjhw/post-183731-0-07175400-1454966028-thumb-1.png It is critical to have dead-band control which is determined by the Vcc/Vgs(th) and yet RdsOn depends on Vgs/Vgs(th)-1 prefer >=3 Thus when gates are driven by same voltage as in CMOS logic, the currents are low with 50 Ohm drivers. but with say 50 mOhm drivers the current spikes are guite large and may cause issues with spiked (SOA) power losses and much greater EMI dI/dt. For these reasons shared gate voltages must only be used on low voltage applications and 12V needs a Zener between the gates + Rpu | |
| Jun 20, 2019 at 13:47 | comment | added | Sieben | P.S. Well, guess I get it with connections, by this picture. i.sstatic.net/KXz6d.png | |
| Jun 20, 2019 at 9:36 | comment | added | Sieben | Saw yours solution you made, of course too. But still have that question. electronics.stackexchange.com/a/318153/222816 | |
| Jun 20, 2019 at 9:35 | comment | added | Sieben | Sunnyskyguy EE75, I need help. Based on this connections, i.sstatic.net/qaop0.png Made up this raw diodes placements. i.ibb.co/5hgyBZ6/Screen-Shot01815.jpg Will that be enough not to burn the mosfets? And if not use the zeners in motor clamps, or cross the mosfet. I hope the locations are correct too. The diodes are F30U60DN. The motor itself, can give a bit higher the 30A Stall current there, with 12v on it etc. Almost constant stall current condition, and rapid direction changes in the application it is used. | |
| Jun 10, 2019 at 14:15 | comment | added | D.A.S. | Inductors integrate pulse voltage into triangle currents (ripple) which will accelerate or de-accelerate motor depending on duty cycle. When one side opens, there must be a flyback (reverse) diode to shunt the voltage | |
| Jun 10, 2019 at 8:05 | comment | added | Sieben | i.ibb.co/0ccvjhw/post-183731-0-07175400-1454966028-thumb-1.png So, provide the picture of the subject. SunnyskyguyEE75, will that stop ripple currents to go back with this method too? Big thanks. Please don't pay much attention to the H-bridge config itself, just the configuration on the whole. I already build one with relay instead of the mosfets. All is working. But really will be good to stay clear of the matter. ) | |
| Jun 6, 2019 at 14:19 | history | edited | D.A.S. | CC BY-SA 4.0 |
deleted 62 characters in body
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| Jun 6, 2019 at 7:40 | comment | added | Sieben | Thank you. Took the description from here) irf.com/electronics/topology-fundamentals Noted also the reverse of sides described there, what responds for what. ) | |
| Jun 6, 2019 at 6:59 | history | answered | D.A.S. | CC BY-SA 4.0 |
