Can This Circuit Work Well? - CR4 Discussion Thread

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cnpower Guru Join Date: Sep 2006 Location: CHINA Posts: 2945 Good Answers: 14	Can This Circuit Work Well? 09/19/2007 9:53 PM
	serveral days ago , I was invited to check out a project. one part is shown as left. input is a positive 12v and negtive 30v pulse of 20khz. coupler is 1:1 transformer. H resistor is 30ohm V resistor is 10K. power supply is 1000V, 1]what load resistor will be on the source of the transistor to get 20khz and 10A? 2]Can this driver drives the mos transistor very well? (I shall give answer later)
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#1 Re: Can this circuit works well? 09/20/2007 2:39 AM
	For the moment let's ignore the 1000v supply...! Quick guess...the real answer is 1. Build it and see.... Or ... 2. Spend ages analysing it...then build it and see ! My guess is that the diode will stop the FET switching OFF Quickly enough...E.G switch off is by the 10k resistor pulling the gate down, and the gate capacitance will stop this happening quick enough... so it will get V hot and burn out, might go BANG! We also don't know what the mark space ratio is...? If it was a 30 volt supply driving a 2 amp load you may have a chance. But at 1000v ! I will go and hide in one of my secret cat nests !! __________________ health warning: These posts may contain traces of nut.
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cnpower Guru Join Date: Sep 2006 Location: CHINA Posts: 2945 Good Answers: 14	#2 In reply to #1 Re: Can this circuit works well? 09/20/2007 11:32 PM
	Hi, cat, you are quite right. that pic will be a rectifier existing because of inherent capacitor of mostr, so that mos cannt work undercondition of pluse. if the load is a transformer, the trnasformer and mostr are all burnt out. just change the diode as left or add yet another zener to protect mostran, it can work normally.
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Qqberci Guru Join Date: May 2007 Location: Budapest, Hungary, HA5YAR Posts: 617 Good Answers: 14	#3 In reply to #2 Re: Can this circuit works well? 09/21/2007 1:06 AM
	Yes, this is much better... But I would worry about 1 kV... __________________ Aged man is not old man...
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cnpower Guru Join Date: Sep 2006 Location: CHINA Posts: 2945 Good Answers: 14	#4 In reply to #3 Re: Can this circuit works well? 09/21/2007 6:04 AM
	oh, dont worry, the load is not a transformer but a resistance type load, like furnace wire etc. the mostransistor is of 1200v to 1600v device. at condition of sobbur protection
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Hap Power-User Join Date: Jan 2007 Location: Walkersville, Md, USA Posts: 139	#5 Re: Can This Circuit Work Well? 09/21/2007 7:53 PM
	where's the money for answer, rate is $145hr __________________ Out Of The Inner Circle
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#6 In reply to #5 Re: Can This Circuit Work Well? 09/22/2007 3:12 AM
	I already gave the necessary 0.5$ answer at #1 __________________ health warning: These posts may contain traces of nut.
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cnpower Guru Join Date: Sep 2006 Location: CHINA Posts: 2945 Good Answers: 14	#7 In reply to #5 Re: Can This Circuit Work Well? 09/26/2007 7:04 AM
	haha, money? money! 145? 0.0000?
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Users who posted comments:

cnpower (3); Hap (1); Qqberci (1); user-deleted-1105 (2)

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