T
treez
Guest
Supposing you want to supply a 3kW resistive load at any power between 0 to 3kW
You need to power it from the 240VAC mains ultimately.
You want very good efficiency, so diode bridge followed by Class D amplifier style PWM'ing is going to be a bit lossy in the upstream diode bridge.
You need it to be PFC compliant, and of a fairly small size generally.
Also, as you know filtering will be needed if HF PWM used, which is likely, due to size constraints.
No mains 20ms cycle skipping as the flicker is deemed unacceptable.
You cant put DC into the resistive load....(unless its pulsating down to zero amps every 10ms...for obvious reasons regarding contactor arcing etc.)
No need for isolation whatsoever.
What's your "fave" method of doing this?
I was initially thinking totem pole (bridgeless) PFC stage but it would mean DC into the load...or would it....
You need to power it from the 240VAC mains ultimately.
You want very good efficiency, so diode bridge followed by Class D amplifier style PWM'ing is going to be a bit lossy in the upstream diode bridge.
You need it to be PFC compliant, and of a fairly small size generally.
Also, as you know filtering will be needed if HF PWM used, which is likely, due to size constraints.
No mains 20ms cycle skipping as the flicker is deemed unacceptable.
You cant put DC into the resistive load....(unless its pulsating down to zero amps every 10ms...for obvious reasons regarding contactor arcing etc.)
No need for isolation whatsoever.
What's your "fave" method of doing this?
I was initially thinking totem pole (bridgeless) PFC stage but it would mean DC into the load...or would it....