posted
I have a little project on the go at work. I am trying to convert a switching power supply to a class D amplifier. It should work since they do the exact same thing... only different. The Class D amp changes the pulse width sent to the transformer primary depending on the audio voltage. The Power supply changes the pulses width to compensate for the changing load on the secondary (keeping a constant output voltage).
I would like to tap into the pulse width modulator and put audio in place of feedback voltage. Anyone ever thought of or tried this?
------------------
Posts: 76 | From: Quispamsis, New Brunswick, Canada | Registered: Oct 1999
| IP: Logged |
No, I haven't thought of it, and no I haven't tried it. I haven't had *quite* that much electrical experience I wouldn't expect the switching power supply to be fast enough... But maybe- Is tech man around???
ShadowStar
------------------
Computers are a lot like air conditioners.. Open Windows and they become useless..
The day Microsoft makes something that doesn't suck is the day they make vacuums.
Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999
| IP: Logged |
posted
I'm working on a design utilizing pwm ic's as the key component in a class D or other- wise output section. I haven't seen it done quite that way and If I accomplish it I plan on trying a patent on the completed circuit. The key is to properly treat the input signal and then to work on getting the output signal to feedback properly and control output. Sorry if I don't give you my secrets until I'm ready. I've already had some success. It took a stroke of genius while laying down and the block diagram was scribbled on a scrap of paper. hehe It really can happen like that.
Printer-friendly view of this topic