Timeline for I want to drive half bridge using gate driver that doesn't use bootstrap method
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Feb 23 at 9:54 | vote | accept | kogyu | ||
| Feb 23 at 7:48 | comment | added | MOSFET | @kogyu Not sure what you mean when you say "using a translator is unnatral". It's by far the most common way to drive the high-side switches. Way simpler than using separate DCDC convertors and cheaper. Also, the level translation complexity is already handled internally by pretty much all gate drivers you can buy. Is it the isolation that's required causing you trouble? | |
| Feb 23 at 7:39 | comment | added | tobalt | @kogyu Exactly. Half-bridge drivers are always designed to run the high side driver on a floating supply. But very often, this floating supply is created by simply adding a diode. Think of the diode as the most simple means to generate this floating supply, but being so simple, it has the drawback of an upper duty cycle limit. | |
| Feb 23 at 7:32 | answer | added | tobalt | timeline score: 0 | |
| Feb 23 at 6:28 | comment | added | kogyu | Do you mean that we only need to supply the power to the high side gate as an insulated power source? | |
| Feb 23 at 5:48 | comment | added | DKNguyen | You can still use a bootstrap gate driver IC. Just remove the bootstrap cap an diode and connect the output of an isolated supply where the boostrap capacitor would normally go. That's basically what using optocouplers is where the high-side opto output is powered by an isolated supply, except that it doesn't have optical isolation. Both approaches work with half-bridges, H-bridges, and 3-phase bridges. | |
| Feb 23 at 5:24 | comment | added | SamGibson♦ | kogyu - Thank you for adding that link to the source of the copied image. However Stack Exchange has specific requirements when copying material from their site (even into another question, as you have done) as part of the CC BY-SA license. Just adding a link is not enough. See here for details. || If no-one else corrects this insufficient reference, I'll do it in a few hours. || In future, please note that copying from a site can require you to do additional things to comply with that license. This is all your responsibility. | |
| Feb 23 at 5:05 | history | edited | kogyu | CC BY-SA 4.0 |
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| Feb 23 at 4:39 | history | edited | kogyu | CC BY-SA 4.0 |
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| S Feb 23 at 4:26 | review | First questions | |||
| Feb 23 at 4:49 | |||||
| S Feb 23 at 4:26 | history | asked | kogyu | CC BY-SA 4.0 |