AN2519 Freescale Semiconductor / Motorola, AN2519 Datasheet - Page 2

• Manufacturer Part Number: AN2519
• Description: 3Sin with Dead-Time Correction - XOR version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

AN2519/D
2
3Sin with Dead-Time Correction – XOR version TPU Function Set (3SinDtXor)
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 3SinDtXor_R and 3SinDtXor_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 3SinDtXor function can be
used to generate one adjustable signal for a wide range of uses, which is
synchronized to the PWM, and tracks changes in the PWM period. The
•
•
•
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
3-Phase Sine Wave Generator with Dead-Time Correction – XOR
version – R channels (3SinDtXor_R)
3-Phase Sine Wave Generator with Dead-Time Correction – XOR
version – T channels (3SinDtXor_T)
Synchronization Signal for 3-Phase Sine Wave Generator with Dead-
Time Correction – XOR version (3SinDtXor_sync)
Resolver Reference Signal for 3-Phase Sine Wave Generator with
Dead-Time Correction – XOR version (3SinDtXor_res)
Fault Input for 3-Phase Sine Wave Generator with Dead-Time
Correction – XOR version (3SinDtXor_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
MOTOROLA