Which is the best way to drive a mosfet

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rajudp

Joined: 27 May 2006
Posts: 238
Helped: 10
Location: India

10 Feb 2009 19:03 best way to drive a mosfet

From this which is the best way to drive a mosfet.

actually it is for a pushpull inverter and i am only showing the driver part.

i found the picture of the board but dont have the circuit. by looking the pict there is no device for driving the mosfet.
i am attaching the pict here

Added after 3 minutes:

Which is the best way to drive a mosfet

jabi

Joined: 24 Dec 2007
Posts: 36
Helped: 20

10 Feb 2009 19:26 Re: Which is the best way to drive a mosfet

it is very easy to find!

u can search in Google , if don't know any site , u can search in Google by Image searcher.

I find this page in first search page of Google.

http://www.tubecad.com/2007/06/blog0111.htm

good luck.

rajudp

Joined: 27 May 2006
Posts: 238
Helped: 10
Location: India

10 Feb 2009 20:22 Which is the best way to drive a mosfet

thanks for the reply

if we drive the mosfet directly then vgs will be below 5v i am interested because only one ic (mostly pic16f676) is used so low cost . i found it from

http://www.qsaki.com/triac_ups.html

if anybody having schematics please share it.

nandhu015

Joined: 11 Feb 2006
Posts: 640
Helped: 46
Location: Tamilnadu, India

11 Feb 2009 4:12 Re: Which is the best way to drive a mosfet

Hai

Pull it down to ground not to +

At reset of micro the output will be tristated. The mosfet will be on unless to change the trisated to output and logic level to 0

Regards
Nandhu

FvM

Joined: 22 Jan 2008
Posts: 5154
Helped: 766
Location: Bochum, Germany

11 Feb 2009 6:48 Which is the best way to drive a mosfet

The single-chip inverter is supposed to use a PWM control IC with sufficient gate drive capability rather than a uP. If you imagine higher output power than a few ten watts, there's no way to drive the power stage from a PIC or any other uP directly.

As you mentioned low cost, you're probably planing to use cheap standard MOSFETs, that require sufficient (e.g. 8-12 V) gate drive voltage for acceptable performance. This can't work without a level translating gate driver.