AN2531/D Motorola / Freescale Semiconductor, AN2531/D Datasheet - Page 2

• Manufacturer Part Number: AN2531/D
• Description: Standard Space Vector Modulation with Dead-Time Correction - XOR version TPU Function Set
• Manufacturer: Motorola / Freescale Semiconductor

AN2531/D
2
Standard SVM with Dead-Time Correction – XOR version (svmStdDtXor)
The dead-time correction technique requires knowledge of the instantaneous
direction of phase currents. In the case of positive phase current the top
channel high-time is equal to the calculated high-time and the bottom channel
has to control the dead-time. In case of negative phase current the bottom
channel low-time is equal to the calculated high-time and the top channel has
to control the dead-time. See
The function set consists of 5 TPU functions:
The svmStdDtXor_R and svmStdDtXor_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. The Synchronization Signal for the svmStdDtXor
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Freescale Semiconductor, Inc.
For More Information On This Product,
Standard Space Vector Modulation with Dead-Time Correction – XOR
version – R channels (svmStdDtXor_R)
Standard Space Vector Modulation with Dead-Time Correction – XOR
version – T channels (svmStdDtXor_T)
Synchronization Signal for Standard Space Vector Modulation with
Dead-Time Correction – XOR version (svmStdDtXor_sync)
Resolver Reference Signal for Standard Space Vector Modulation with
Dead-Time Correction – XOR version (svmStdDtXor_res)
Fault Input for Standard Space Vector Modulation with Dead-Time
Correction – XOR version (svmStdDtXor_fault)
In case of positive current:
In case of negative current:
Go to: www.freescale.com
Figure 2. Dead-Time Correction Technique
Figure
DT
DT
calculated
high-time
2.
DT
DT
top channel
bottom channel
top channel
bottom channel
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