Difference between revisions of "Anchor"
From Hackstrich
(Finalizing some details around the MCU and ADC.) |
(More updates for the final CPU configuration.) |
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*** Ethernet could be cool, but that seems overkill here | *** Ethernet could be cool, but that seems overkill here | ||
*** GPIB would be the traditional choice for test gear, but I've never done any work with it | *** GPIB would be the traditional choice for test gear, but I've never done any work with it | ||
| − | + | * PIC24FJ256DA210 will be used as it has all the graphics/LCD drive/acceleration built in to enable a nice colour TFT display | |
| − | + | ** '''Inputs''' | |
| − | + | *** Digital | |
| − | + | **** Load On/Off | |
| − | + | **** CC/CV mode? | |
| − | + | **** 2 for UI quadrature encoder | |
| − | + | *** MCU-integrated 10-bit ADC | |
| − | ** | + | **** Heatsink temperature |
| − | + | **** UI pot (if used) | |
| − | + | *** I2C | |
| − | + | **** LTC2453 I2C 16-bit ADC for current and voltage measurement | |
| − | **** I2C | + | ** '''Outputs''' |
| − | + | *** Digital | |
| − | ** | + | **** 1 for a CC/CV mode relay (if required) |
| − | + | *** Analog/PWM | |
| − | + | **** Output drive (to op-amp) | |
| − | *** | ||
* An LCD would be cool to plot the response of load variations without a PC (transient response, current limits, etc.) | * An LCD would be cool to plot the response of load variations without a PC (transient response, current limits, etc.) | ||
** Could use a simple [http://www.sparkfun.com/products/710 STN monochrome panel], would be cheap and work well | ** Could use a simple [http://www.sparkfun.com/products/710 STN monochrome panel], would be cheap and work well | ||
Revision as of 18:30, 24 December 2010
Anchor will be an electronic current/voltage sink, for testing/characterizing power supplies and other similar tasks.
- Desired features/specs:
- Constant current and constant voltage options
- Maybe constant power too?
- Ramp-up/down automatically and track outputs
- Pulse load to test transient response
- 5A/100V maximums
- 500W dissipation in a FET is a bit nuts, so it won't be 5A *at* 100V
- 100W continuous, 500W pulse might be reasonable? Would be nice anyway.
- Some kind of computer interface for more complicated tests/more detailed data analysis
- USB would be easy to implement
- Ethernet could be cool, but that seems overkill here
- GPIB would be the traditional choice for test gear, but I've never done any work with it
- Constant current and constant voltage options
- PIC24FJ256DA210 will be used as it has all the graphics/LCD drive/acceleration built in to enable a nice colour TFT display
- Inputs
- Digital
- Load On/Off
- CC/CV mode?
- 2 for UI quadrature encoder
- MCU-integrated 10-bit ADC
- Heatsink temperature
- UI pot (if used)
- I2C
- LTC2453 I2C 16-bit ADC for current and voltage measurement
- Digital
- Outputs
- Digital
- 1 for a CC/CV mode relay (if required)
- Analog/PWM
- Output drive (to op-amp)
- Digital
- Inputs
- An LCD would be cool to plot the response of load variations without a PC (transient response, current limits, etc.)
- Could use a simple STN monochrome panel, would be cheap and work well
- Could alternatively use a touchscreen OLED, would be expensive but look really cool
- Middle ground would be a touchscreen LCD, which would be not-crazy-expensive and still look pretty cool
- With any of these options, want the critical UI bits to be physical controls (current/voltage mode/setting)
