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openbench:psu [2011/01/15 05:25] pstemari |
openbench:psu [2016/01/28 18:05] |
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- | ====== What ====== | ||
- | A simple adjustable DC power supply: hardware | ||
- | For more info, read about [[start|openbench]] | ||
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- | ====== Notes & stuff ====== | ||
- | ===== Design constraints ===== | ||
- | Outputs: | ||
- | * 2 adjustable outputs | ||
- | * 1 fixed output | ||
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- | Voltage: | ||
- | * adjustable outputs: 0-30V, adjustable | ||
- | * fixed output: 5V | ||
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- | Current: | ||
- | * adjustable outputs: 0-2A, adjustable | ||
- | * fixed output: 2A | ||
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- | Indication: | ||
- | * voltage (for adjustable outputs only) | ||
- | * current (for adjustable outputs only) | ||
- | * current limiting active (constant voltage / constant current) (all outputs) (red LED) | ||
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- | Options: | ||
- | * combine to 0-60V / 2A (series) | ||
- | * combine to 0-30V / 4A (parallel) | ||
- | * link voltages (can be used for parallel mode or symmetric output) | ||
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- | ====== comments ====== | ||
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- | What happens when the output voltage is set to 3.3 V, and I hook it up to a 12 V battery? | ||
- | Which is better: | ||
- | * The PSU pulls the voltage down to 3.3 V (or as close as possible until it hits the current limit)? or | ||
- | * The PSU supplies zero current, letting the voltage float up to 12 V? | ||
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- | Should have a 3.3v fixed output as well as the 5v. Easy enough to handle. 1A should be good for most purposes on the fixed supplies. Elektor ran a switching PSU module in April that I made some tweeks on and currently as waiting on boards. Galvanically isolating the adjustible supplies is a potential issue. As soon as you hook a meter panel up, the two supplies are tied together. Hack around it by using two MCUs for A/D and transmitting to a third one via optoisolators?--pstemari | ||
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