Firmware » History » Revision 5
Revision 4 (Luiz Fernando Lavado Villa, 2019-02-28 13:37) → Revision 5/6 (Luiz Fernando Lavado Villa, 2019-04-17 17:43)
h1. Firmware
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The firmware of the single-phase project consists of a static scheduler coded in C and compatible with an ATMEL Mega328P micro-controller.
This scheduler controls the timing of several actions and guarantees that the code has a deterministic loop time, leading to a stable operation.
Details of the scheduler itself and its actions are given in the sections below.
h2. General introduction
The ATMEL Mega328P family is a low-cost choice of micro-controller with sever limitations when it comes to power electronics.
These limitations are many-fold, but mostly it consists of low calculation capabilities.
Its use for a DC-DC converter is still feaseable maily due to the fact that no major calculation is performed.
However, for more advanced applications such as inverters this micro-controller will have to be replaced by a more capable counterpart.
The main philosophy of the code described in this section was to create a loop with a deterministic time.
This means that the code will execute within a certain time frame which is predictable and stable.
This stability allows the converter to control its inputs and outputs, even if at limited speed.
The main technique used to achieve this deterministic time frame was to avoid coding interruptions and to use a scheduler.
h2. Scheduler
h2. Inputs and Outputs
h3. SPI communication
h3.
h2. PWM duty cycle management
h3. h2. Control loop
h2. UART communication
h2. Control loops
h3. Fast reference tracking
h2. Other algorithms
h3. Photovoltaic MPPT
h3. Half-leg inverter