Current proportional to 1/V^2. Discrete PFC controller

[Genome]

Being silly I'm trying to implement the control circuitry for a PFC
stage more or less discretely. I can do a gm multiplier, see in ABSE,
and that does the job with one limitation.

VVEA programs the average current through MULTOUT which drives 4
parallel operated power stages for a power factor corrector. The
multiplier makes this program current proportional to VLINE so that the
load appears resistive.

Ideally the current in the lower mirror, Q3/Q4, should be inversly
proportional to the average of the squared rectified line voltage to
maintain a constant power throughput.

Is there a simple way of achieving this or a similar effect elsewhere in
the circuit.

I'm thick

Ask more questions if it needs clarification.


Thanks

DNA

 

[Genome]

| Being silly I'm trying to implement the control circuitry for a PFC
| stage more or less discretely. I can do a gm multiplier, see in ABSE,
| and that does the job with one limitation.
|
| VVEA programs the average current through MULTOUT which drives 4
| parallel operated power stages for a power factor corrector. The
| multiplier makes this program current proportional to VLINE so that
the
| load appears resistive.
|
| Ideally the current in the lower mirror, Q3/Q4, should be inversly
| proportional to the average of the squared rectified line voltage to
| maintain a constant power throughput.
|
| Is there a simple way of achieving this or a similar effect elsewhere
in
| the circuit.
|
| I'm thick
|
| Ask more questions if it needs clarification.
|
|
| Thanks
|
| DNA
|
|

Got bored with it. The question probably has no viable answer, at least
not at the level of simplicity I'm looking for.

Implemented a VFF comparator and modified the multiplier a bit.

Results in ABSE.

Thanks

DNA