Hello World! First post alert!
So I have an idea to create a very versatile multimode lab power supply:
Use a class AB power amplifier design of suitable output power and able to pass DC to output, fed by a "programmed" input signal from a microcontroller (employing either a DAC or PWM and filter) to create the desired waveform. With this concept, you should be able to create an extremely versatile PSU supporting:
DC Mode: Voltage Control both + and -, Current Limiting
AC Sine Mode: Voltage Control (specified as any of rms, pk, or p-p), Frequency Selection, DC Offset
Pulsed DC Mode: (rectified AC)
Square Wave: Voltage Control, Pulse Rate, Pulse Width (or specified as duty cycle)
and pretty much any other waveform you would want to add. It is similar to a signal or pattern generator except that you can supply larger currents and set constraints on combinations of voltage, current, etc. Programs including modulation and superposition of AC on DC and vice versa could be added to enhance testing of various devices like opamp CMRR and PSRR specs, etc.
With multiple channels created by replicating the power sections but retaining control by a single ucontroller, you could even set up multi-phase AC and square wave power, and have programmable / variable phase relationship from a front panel. Floating grounds/returns on each channel with selectable interchanne; connections allow for more possibilities.
In the interest of full disclosure: I am not a college educated engineer, so I apologize for any misuse of jargon. I am an avid electronics experimenter, and am looking to enhance my own amateur lab by creating novel instrumentation.
I would love to hear comments and discussion from others on the board. I have not breadboarded anything for this design yet.