[Amps] Inverter Microwave HV Supply

[Steve Thompson]

Ian White GM3SEK wrote:
> Steve Thompson wrote:
> 
>>
>>David Smith wrote:
>>
>>>Several people have reported problems accessing the file.  Try dropping
>>>the www - i.e.
>>>
>>>users.bigpond.net.au/dwsmith/hv_inverter.pdf
>>
>>Odd - I tried that yesterday and it didn't work, now it does. Probably
>>my typing.
>>
>>I'm confused with the circuit around Q702. As I see it, it can only work
>>if there's enough leakage in Q702 to charge C703. Get a good one and
>>lack of flywheel puts Q701 in danger.
> 
> 
> It does look strange... looks like they're trying to avoid having to 
> provide gate drive to the floating transistor Q702, and are making Q702 
> trigger itself instead.
Thinking more about it, C703 will charge from a spike at Q701 collector 
that's higher than the + rail - but that spike might just kill Q701....

Steve