Simple High-Frequency Resonant Gate Drive for MOSFET - Concept and Simulation

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This circuit simulation shows a simple method for implementing a high-frequency resonant gate drive. The primary goal is to significantly reduce current stress on the gate drive switches. Features include high MOSFET saturation, less-than-50% output duty cycle, and zero-current switching (ZCS) on on all transitions of the gate drive switches.
NOTE: Capacitor and inductor values used in the simulation are impractically large, simply for the purpose of analyzing the circuit function at low frequency. A real-life implementation will require the selection of appropriately sized components based on the desired resonant frequency.

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Опубликовано:

10 фев 2015

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Комментарии : 23

@Mathias0178 7 лет назад

Thank you very much! This description of resonant Gate Drivers helped me a lot to understand them. A nice simulation tool btw :D

@nosuchthing4789 6 лет назад

Just WOW! Thanks for sharing! :)

@willempje65 7 лет назад

Thank you for sharing. This is a better way of driving mosfets from low-power circuits, opposed to having drivers and drivers driving drivers :-)

@kevpatt 7 лет назад

Thanks! I am also not very impressed with typical approach of drivers driving drivers... :) However, recently I have been experimenting with GaN MOSFETs. While they are still quite expensive, they typically have very small gate capacitance compared to silicon MOSFETs, which means high-power gate drive circuitry isn't necessary in most cases.

@redoverdrivetheunstoppable4637 6 лет назад

i tried a 4nF gate mosfet as capacitor on a 555, it worked!! *puts on dunce hat*

@davebutler3905 Год назад

Nice idea. Very well explained. Not much use for PWM though!? The transistor would also get hot due to transitory low gate voltages.

@MrMac5150 9 лет назад

The Best.

@kevpatt 8 лет назад

+MrMac5150 Thanks!

@NNNILabs 7 лет назад

Could this be configured to any frequency?

@boonedockjourneyman7979 4 года назад

I wish there was more on this project. Is the gate to source capacitance of a jelly bean MOSFET consistent enough from one MOSFET to another to make the selection of the inductor possible?

@yiyou6529 4 года назад

This is, indeed, a very nice concept. I wonder if you have tried this already. I guess in low frequency scenario, resonance driver is not that necessary. How about high frequencies, e.g. MHz range?

@steeringelectricity2779 5 лет назад

Question: If you have 2 zeners back to back like that, why wouldn't a large voltage beyond the rated voltage of the zener at the gate not flow right in. IF a large voltage is applied on the source, the lower zener is forward biased to that voltage on the source, then there is the upper zener (sorry, i'm going to keep calling them upper and lower based on the typical view in your video) which has a certain rated zener voltage. I don't get why that voltage/current couldn't just scooch right on up if it was beyond the upper zeners rated zener voltage. Would that upper zener be more useful as a regular diode with a low reverse leakage that flows down through a zener with the desired zener voltage less the diode voltage drop on the upper one?

@robertodilorenzo5086 4 года назад

Great video!! I have a question, how is it possible to obtain the transfer function to calculate the resonant frequency? I tried without success. I want to get a parametric mathematical expression for resonant frequency. thak you for help. =)

@davebutler3905 Год назад

1/(2π✓(LC))

@representthemoment 8 лет назад

i used this simulator .....as i am not familiar with electronics i want know few things.....while running simulation some electric path and part it shows red what that red color means? also what abpout green and yellow dots?

@kevpatt 7 лет назад

In this simulator, the green color represents a positive voltage and the red color represents a negative voltage (with respect to ground). The voltage range is configurable. The movement yellow dots represents current flow, and the speed is also configurable. The simulator is here: falstad.com/circuit/

@ajaydeepak129 9 лет назад

Great work sir . But what does this rgt have to do with MEMS ? They say tat rgt was the first MEMS device.

@kevpatt 9 лет назад

ajay deepak Well RGT (resonant gate transistor) is not the same thing as RGD (resonant gate drive). There is no MEMS technology in my presentation. RGT is a type of micro-electro-mechanical system involving a microscopic (mechanical) tuning fork as a frequency selector, whose motion is detected by proximity to a nearby FET gate. In my video, I am talking about driving FET (actually MOSFET) gate voltages in a resonant fashion, utilizing the built-in gate capacitance and an external inductor as the resonant elements. This is electrical or "signal" resonance, not mechanical resonance. Hope that helps.

@ajaydeepak129 9 лет назад

Kevin Patterson Thanks for the clarification .. much needed ...