AC amplitude modulation for inductive loads
- From: "Marcel Baum" <privat@xxxxxxx>
- Date: Tue, 23 Oct 2007 17:14:24 +0200
I have got a linear pump which needs a sinusoidal excitation.
The pumpflow is controlled by the amplitude of the AC to the coils
The amplitude is controlled via a DC input signal which on itself can change
very fast.
So far I have used a 24VAC pump, which is no longer available, the actual
pumps have 230VAC (50hz). The rated power is roughly 150W.
My present design is powered from 24V DC and utilises a full (H-) Mosfet
bridge.
The bridge is controlled by a MC 33035 which is a PWM motor controller with
an analogue input and a direction signal. The analogue input gets a sine
have wave with variable amplitude, the DIR input sees a 50hz TTL signal in
phase with the sinus.
To go on with this design I would have to rectify the 230V, change to a 500V
Mosfet bridge and to add some HV photocouplers to feed the hi side Fets of
the bridge.
Does anyone have better suggestion how to directly modulate the mains AC
instead of synthesising the AC from a DC source?
I probably should mention that the pump wants to see a sinus like (or
trapezoid) excitation which limits the use of a triac .
Any ideas are welcome.
.
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