STM32 MCSDK Single Shunt Phase Shift (new in V5.Y)

1. Single shunt phase shift overview

In the context of a single shunt topology, the purpose of the phase-shifting is to shift one or two duty cycles to be able to sample the current signal in the boundary zones instead of inserting a distortion window.

The benefits are:

• Fewer commutations
• Less switching losses

2. Phase shift principle

Boundary zone 1:

• The firmware shifts on the right the smallest duty cycle by TMIN (minimum window time for sampling)

Boundary zone 2:

• The firmware shifts on the right the most middle duty cycle by TMIN (minimum window time for sampling)

Boundary zone 3:

• The firmware shifts on the right the smallest duty cycle and on the left the highest duty cycle by TMIN (minimum window time for sampling)

3. Peripheral usage

Phase-shifting needs the following peripherals to create the shifting. According to the advanced timer capabilities, one or two DMA channels will be used

MCU	TIM	DMA	IRQ
F0	TIM1	DMA1_Ch5 DMA1_Ch4	DMA1_Ch5 HT and TC
G0	TIM1	DMA1_Ch4	DMA1_Ch4 HT and TC
F3	TIM1	DMA1_Ch4	DMA1_Ch4 HT and TC
	TIM8	DMA1_Ch2	DMA1_Ch2 HT and TC
F4	TIM1	DMA2_stream4 DMA2_stream5	DMA_stream5 HT and TC
	TIM8	DMA2_stream7 DMA2_stream1	DMA_Stream1 HT and TC
G4	TIM1	DMA1_Ch1	DMA1_Ch1 HT and TC
	TIM8	DMA2_Ch1	DMA2_Ch4 HT and TC
L4	TIM1	DMA1_Ch4	DMA1_Ch4 HT and TC
	TIM8	DMA2_Ch2	DMA2_Ch2 HT and TC
F7	TIM1	DMA2_stream4	DMA2_Stream4 HT and TC
	TIM8	DMA2_stream7	DMA2_Stream7 HT and TC

4. Single shunt phase shift scheduling example

6 channels advanced timer and execution rate = 1 (G0,G4,F3,L4,F7)

5. Single shunt phase shift in the STM32 MC SDK

Single shunt is implemented by r1_ps_pwm_fdbk.c (and .h) processed when the STM32 MC project uses a MCU.