Barry,


I see there's no DIL-6 version of the LTC6993, do you happen to know if there is an equivalent in that shape?


regards,
Mario

Missed a photo!

Hi Mario,

I am using the same two cap setup and same two bidirectional switches as your scheme. I switch both mosfets in the switch on or off, I dont switch them individually.

If you want to switch each mosfet individually then instead of combining the pulse triggers with an OR gate, they would need to trigger individual pulse monostables, so 2 extra LTC6993-3's would be required.

The direction of current flow through the switch i.e. charging or discharging depends on potential difference between the cap and where on the sine you switch.

See attached photo... Cap 1 is charged on a positive rising half sine and then discharged on the negative falling half sine. Cap 2 is charged on the negative rising half sine and then discharged on the positive falling half sine.

Barry

Hi Mario,

 The 1,4,3,2 sequence did not work for me, with voltage and current staying in phase.

I can now see that the discharge in the 2nd and 4th quadrants immediately after charging in the 1st and 3rd quadrants, is the action that creates the 90 degree phase shift in current with respect to voltage. This was very clear in your photo IMG-16933.

I will use the attached SERPS timing circuit rev, that pulses the quadrants in a 1,2,3,4 sequence.  Looking at this arrangement... what is the difference between this and just allowing each cap to charge and discharge over a half cycle?


I am using a 100W line amplifier that outputs about 185V rms max. Its safer to experiment with this source first.

I have a transformer built from two MOT cores. The lower core has two MOT primaries in series. The two coils increase the inductance and drop the magnetising current .This allows continuous running. Microwave ovens only run for short periods and a single coil will get hot due to the small magnetics and minimal turns.
 On the upper core, I have two more MOT primary coils that can be wired in series or parallel. In my case that will give me a secondary with 110 or 220V. This is a cheap high power isolated transformer solution.

Usual warnings to all.. dont try this unless you have experience with high voltage work.

Barry

Hi Mario,

The only difference is with 1,4,3,2 the discharge is into the opposite polarity, (and this resulted in the current staying in phase with the voltage. With 1,2,3,4   the discharge is into the same polarity.

Barry

Hi Barry, no inductors, only light bulbs for now.


regards,
Mario

Hi Mario,

The only difference I can see is that both my switches are turned on during 2 and 4. On yours only the discharge switch is turned on during 2 and 4.



Barry