Programmable power supply

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This page documents the config keys are various other info needed to write a libsigrok frontend for controlling programmable power supplies.

TODO

  • Some way to specify fixed values for voltage and current, for devices that have one or more of these fixed in some channels. Two options:
    • A boolean key _FIXED, per channel
    • A _MIN corresponding to _MAX: When set to the same as _MAX, denotes a fixed setting for that channel. This would also allow negative values, for e.g. a range -5V - 5V
  • Over temperature protection: need some examples of whether this is ever something that is gettable/settable, or is only ever a hardware feature.

Notes

It's not unusual for different channels on a device to have different voltage or current limits. Therefore, channels will generally be in a probe group which allows setting these limits.

After setting SR_CONF_CHANNEL_OUTPUT, the limits of these channels may change, and the limits should be queried again.

Config keys

A libsigrok driver for a programmable power supply implements all or some subset of the following config keys.

SR_CONF_POWER_SUPPLY

Denotes a device that provides power output via one or more output channels, typically with voltage and current set via the sigrok driver.

SR_CONF_OUTPUT_VOLTAGE

  • double, representing voltage.
  • get: The current output voltage. This may not be the same as what was set -- the output may be disabled, or can change depending on the load.
  • set: NA
  • list: NA

SR_CONF_OUTPUT_VOLTAGE_LIMIT

Controls an output voltage limit that prevents setting a higher output voltage (manually).

  • double, representing voltage.
  • get: The current maximum output voltage.
  • set: The current maximum output voltage.
  • list: NA

SR_CONF_OUTPUT_VOLTAGE_MAX

  • double, representing voltage.
  • get: The previously set maximum output voltage, or device default.
  • set: Maximum output voltage.
  • list: Supported voltage range as (low, high, step).

SR_CONF_OUTPUT_CURRENT

  • double, representing current.
  • get: The actual output current. This may not be the same as what was set -- the output may be disabled, or can change depending on the load.
  • set: NA
  • list: NA

SR_CONF_OUTPUT_CURRENT_LIMIT

Controls an output current limit that prevents setting a higher output current (manually).

  • double, representing current.
  • get: The current maximum output current.
  • set: The current maximum output current.
  • list: NA

SR_CONF_OUTPUT_CURRENT_MAX

  • double, representing current.
  • get: The previously set maximum output current, or device default.
  • set: Maximum output current.
  • list: Supported current range as (low, high, step).

SR_CONF_OUTPUT_ENABLED

  • boolean
  • get: actual state of output
  • set: turn output on or off

If a channel/probe group cannot be enabled or disabled separately from other channels, setting this key will return SR_ERR_NO. The set should then instead be tried with a NULL probe group, for devices that have only a global setting for this.

SR_CONF_OUTPUT_CHANNEL

If available, this key is used to set the channel output to independent (the default), series, or parallel.

TODO enumeration

SR_CONF_OVER_VOLTAGE_PROTECTION

  • boolean
  • get: current state of OVP
  • set: turn OVP on or off

SR_CONF_OVER_CURRENT_PROTECTION

  • boolean
  • get: current state of OCP
  • set: turn OCP on or off
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