Is there ever a need to fully regenerate a lower AC sine? And if so how?
Using a trigger and a triac, zero crossing switching or not, to chop the AC up and "reduce" the voltage works for light dimmers and motor controllers. But is there a way to emulate a variac using chips? To get around the problems with phase (or burst) control?
From a DC circuit's perspective (not a motor or lamp) is having voltage only half the time the same as having constant swing that only goes half as far?
When I make a DC circuit to run off mains it gets a full bridge and filter cap(s) at least. Maybe a regulator. Either way Vdc will be lower if I reduce the Vac coming out of the transformer. (unless the AC was so over-spec that the regulator can still get enough V to regulate.)
Imagine something with 3 types. A lighted digital hairdryer. So chopped the heater core would run cooler, the fan would run with less RPMs, and the light would be dimmer. But would the auto-cutoff timer run longer, being supplied with the same voltage but just chopped for duration? Or if the temp was sampled from a thermocouple and a uC, would the heater core actually run at the same temperature as non-chopped?
Not that I want to see if televisions smoke when you drive them with 55Vac or anything. I just want to understand. I should probably investigate "true sine" country power adapters.
Any suggested reading? Thanks.
Using a trigger and a triac, zero crossing switching or not, to chop the AC up and "reduce" the voltage works for light dimmers and motor controllers. But is there a way to emulate a variac using chips? To get around the problems with phase (or burst) control?
From a DC circuit's perspective (not a motor or lamp) is having voltage only half the time the same as having constant swing that only goes half as far?
When I make a DC circuit to run off mains it gets a full bridge and filter cap(s) at least. Maybe a regulator. Either way Vdc will be lower if I reduce the Vac coming out of the transformer. (unless the AC was so over-spec that the regulator can still get enough V to regulate.)
Imagine something with 3 types. A lighted digital hairdryer. So chopped the heater core would run cooler, the fan would run with less RPMs, and the light would be dimmer. But would the auto-cutoff timer run longer, being supplied with the same voltage but just chopped for duration? Or if the temp was sampled from a thermocouple and a uC, would the heater core actually run at the same temperature as non-chopped?
Not that I want to see if televisions smoke when you drive them with 55Vac or anything. I just want to understand. I should probably investigate "true sine" country power adapters.
Any suggested reading? Thanks.
