Re: Low Voltage Cutoff Circuit
From: John Fields (jfields_at_austininstruments.com)
Date: 08/27/04
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Date: Fri, 27 Aug 2004 13:52:07 -0500
On Fri, 27 Aug 2004 16:17:59 GMT, "Me" <me@me.me> wrote:
>
>"Fred Bloggs" <nospam@nospam.com> wrote in message
>news:412E9C78.4010403@nospam.com...
>>
>>
>> John Fields wrote:
>> > On Thu, 26 Aug 2004 04:29:41 GMT, "Me" <me@me.me> wrote:
>> >
>> >
>> >
>> >>Thanks for the replies.
>> >>
>> >>Here's what I was thinking. An SCR connected in series with the Ballast.
>> >
>> >
>> > ...
>> >
>> > ---
>> > Sounds like a good idea. Just for grins, how much current does your
>> > ballast draw when it's running? Does it draw any current when its
>> > internal low-voltage cutoff is active?
>> >
>>
>> good question- assuming that ballast cut-off current does fall below the
>> SCR holding current, the simplest ckt would use a momentary ON-OFF-ON
>> rocker switch- these are available in surplus:
>>
>> View in a fixed-width font such as Courier.
>>
>>
>>
>>
>> rocker sw
>> +--------+
>> | o--|-------------+
>> | | |
>> +-|-o---> | |
>> | | | |
>> | | o | |
>> | | | | |
>> | +--------+ |
>> | | SCR |
>> | | |
>> Vbatt>---+-------------------|>|--+-> Load
>> | /
>> | 100 |
>> +---/\/\----+
>>
>
>The problem is, I have to use an existing switch, Momentary with lock on.
--- I'm getting kind of confused here... The switch that you're stuck with, is that a switch that came with the ballast and is in series with the supply? That is, when it's ON does it have to pass all the current the ballast needs? -- John Fields
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