Re: High Voltage leaky diode (or any diode like device)
- From: dirskyster@xxxxxxxxx
- Date: Thu, 27 Mar 2008 08:20:57 -0700 (PDT)
On 3月27日, 下午6时32分, "Mook Johnson" <m...@xxxxxxxx> wrote:
I have a circuit that is essentially a resistor and zener. The zener is a
200V low TC zener (1n4085) and the resistor feeding is is 300K. The supply
voltage will vary in an nominal range of 100 to 300V and nust deal with 5
second transients up to 600V (once/hour). To keep the peak power
dissipation below the ~1/2 the diodes rated power of 2.5W, the current
limiting resistor has to be 32K.
In this circuit I need the zener to be a follower (Vcathode = Vin) when the
device is below 200V and a clamper at 200V when Vin ia above 200V.
Odviously the zener has a knee that is somewhat soft but acceptable. My
problem is at 100V the zener has leakage that is proportional with
temperature. This will cause an error when the sener is in vollower mode
that gets worse with temperature.
I'm thinking that if I can find a 800-1000V diode that leaks in a manner
that more that compensates for the zener leakage below Vz, and hang that in
parallel with the 32K resistor, that would fix this problem.
What I really need is a say a 1mA 800 to 1000V rated current source that is
fairly constant over a wide temperature range and doesn't require more than
1V to turn it on.
any ideas?
Do you want access to China's massive pool of electronic
manufacturers... but lack the time to contact suppliers, negotiate
contracts, arrange shipping or monitor product quality? Don't worry -
Let seriouswholesale deal with all that for you.
*Check out the huge range of Gadgets, MP3 / MP4 Players, Car DVD /
Audio, and Computer Accessories now by visiting the online wholesale
catalog at seriouswholesale. com You'll have peace of mind thanks to
the seriouswholesale Quality Control, 12-month Warranty on all
products, and easy secure payment by credit card through Paypal.
Selling on eBay or your own online store? Send products direct from
our warehouse to your customers using our unique drop-shipping
service. You can profit by selling hundreds of different products,
without holding any of your own inventory! Any questions you have will
be answered by the seriouswholesale English-speaking customer support
team... Their aim is to make your China electronics importing business
easier to run than ever before.
Welcome to http://www.seriouswholesale.com.
seriouswholesale - Buy from the source, profit without the hassle.
- 12 Months Warranty - No minimum order restrictions - Drop-shipping
with no additional fee - Pay by safely by PayPal seriouswholesale
Wholesale Co., Ltd.: Chinas original and best online electronics
wholesaler & drop-shipper: seriouswholesale. com
.
- References:
- High Voltage leaky diode (or any diode like device)
- From: Mook Johnson
- High Voltage leaky diode (or any diode like device)
- Prev by Date: Re: High ip3 vhf mixer
- Next by Date: Re: Subscribe FREE Technical Magazine
- Previous by thread: Re: High Voltage leaky diode (or any diode like device)
- Next by thread: Re: High Voltage leaky diode (or any diode like device)
- Index(es):
Relevant Pages
|
