3 Components and functions
16 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH
3.1 Electronic controls
The A
LIA ventilator uses an 8-bit micro controller. This controls the
sensors and actuators in the system.
In addition to these components, the unit also has electronic components
which provide the electrical power supply.
These consist of a power supply unit and a device for bridging any power
failure. In the event of a power failure, the device switches over to battery
operation and regulates the battery charging process.
The sensor board generates voltages of ±15V and -5V, and the controller
board generates + 5V.
3.1.1 Sensor board
The sensor board acts as interface for triggering the actuators (control of
the fresh gas reservoir and the expiration valve) and for registering the
measured data (pressure and differential pressure sensors, AD converter).
An SPI bus system provides the link to the micro controller. This
simplifies linking the various components in terms of both hardware and
software.
The following illustration shows the components on the sensor board.
Abb. 2: Sensor board
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