berkays / stm32vfd

Variable frequency SVPWM Driver for STM32 MCUs.

Summary

Variable frequency SVPWM driver(VFD) prototype for STM32 MCUs. Default values and drivers are designed to run on a blue pill module with STM32F103C8T6. Since the project uses CubeMx HAL drivers, It can easily be ported to other STM32 microprocessors. Default lookup tables are constructed using 0x7FFFh(32.767) as peak value and k=0.15 for third harmonic coefficent.

Value	Default Value	Description
TIM1 Clock	72Mhz
TIM2 Clock	72Mhz
Prescaler	2 - 1	Used for TIM1 and TIM2
TIM1 Period	32767	Lookup tables need to be adjusted accordingly. PWM frequency needs to be tweaked for your driver circuit.
PWM Frequency	~1KHz	72MHz / (2 * 32767)
TIM2 Period	N/A	Dynamically adjusted using potentiometer.
LUT_STEP	1	Defines how much the pointer will step in single interrupt. Higher LUT step will result in higher frequencies without touching TIM2 period. Depending on the value, it can skip some values entirely wasting flash space.

Peripherals

• Timer1 with complementary pwm outputs and deadtime support.
• Timer2 Simple timer for sinewave lookup table stepping.
• ADC Reading frequency input from a potentiometer

CubeMx Script

CubeMx generated folder structure can automatically be imported using the import.sh script.

Generated folder root path must be provided as an argument:

./scripts/import.sh ~/CubeMxWorkSpace/VFD