AN2529 Freescale Semiconductor / Motorola, AN2529 Datasheet - Page 5

• Manufacturer Part Number: AN2529
• Description: Standard Space Vector Modulation - XOR version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

Detailed Function Description
Standard Space
Vector Modulation –
XOR version – R
channels
(svmStdXor_R)
and Standard Space
Vector Modulation –
XOR version – T
channels
(svmStdXor_T)
MOTOROLA
Standard Space Vector Modulation – XOR version TPU Function Set (svmStdXor)
The svmStdXor_R and svmStdXor_T TPU functions work together to generate
6 pairs of XOR gate inputs. The XOR gate outputs then produce a 6-channel
3-phase center-aligned PWM signal with dead-time between the top and
bottom channels. In order to charge the bootstrap transistors, the PWM signals
start to run 1.6ms after their initialization (at 20MHz TCR1 clock). The functions
generate signals corresponding to Reference Voltage Vector Amplitude of 0
(50% duty-cycle) until the first reloaded values are processed.
The CPU controls the PWM output by setting the TPU parameters. The Stator
Reference Voltage Vector components u
run time. The PWM period T and the prescaler – the number of PWM periods
per reload of new values – are also read at each reload, so these parameters
can be changed during run time. Conversely, dead-time (DT) is not supposed
to be changed during run time. The CPU notifies the TPU that the new reload
values are prepared by setting the LD_OK parameter. The TPU notifies the
CPU that the reload values have been read and new values can be written by
clearing the LD_OK parameter.
The TPU writes the parameter Sector, which indicates the current Stator
Reference Voltage Vector position in sector 1 to 6.
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á
and u
â
have to be adjusted during
Detailed Function Description
AN2529/D
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