Igbt Output With Dead Time; Operation - Panasonic MN101L Series User Manual

Chapter 9
16-bit Timer

9.11 IGBT Output with Dead Time

The IGBT output with dead time which is delay time for ON/OFF is output from TM7IO or TM8IO pin when the
referenced IGBT signal is inverted. The output trigger is selected from IRQ0, 1, 2 and Timer 7 count operation.
Updating the Timer 7 preset register 1, 2 and Timer 7 dead time preset register 1, 2 is prohib-
ited during IGBT operation.
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9.11.1

Operation

IGBT Output Operation with Dead Time (Timer 7)
The IGBT output with dead time can be selected with the TM7MD4.T7NODED. The dead time value can be set
with TM7DPR1 and TM7DPR2. Only Timer 7 can support the IGBT output with dead time.
IGBT Trigger
IGBT trigger can be selected from IRQ0, 1, 2 and Timer 7 count operation by setting the TM7MD3.TM7IGBT0-
1. When using IRQ0, 1 and 2 as a IGBT trigger, the valid level is selected by setting the TM7MD3.T7IGBTTR.
When setting the bit to "1" to select the rising edge, the count operation is executed while the corresponding inter-
rupt pin is "High". When setting the bit to "0" to select the falling edge, the count operation is executed while the
corresponding interrupt pin is "Low".
To control the activation with the instruction, select "TM7EN count operation". In that case, the timer count oper-
ation and IGBT output are controlled with the TM7MD1.TM7EN. When setting the bit to "1" to start counting,
the count operation continues until the bit is set to "0" to stop counting. Be sure to set the TM7MD3.T7IGBT0-1
before setting the TM7MD1.TM7EN. In this case, The setting of the TM7MD3.T7IGBTTR is invalid. When the
counter is stopped, the binary counter is cleared at the same time. The data of the preset register are loaded to the
compare register in synchronization with the count clock
Dead Time Count
The dead time counter counts the timer source clock. When the dead time is set to be inserted at the falling edge,
the time from the falling edge of TM8IO to the rising edge of TM7IO is set by the TM7DPR1 and the time from
the falling edge of TM7IO to the rising edge of TM8IO is set by the TM7DPR2. The dead time inserted actually is
the setting value in TM7DPR2 + 1 cycles.
Only during the period from the time when the IGBT output is enabled by the IGBT trigger to the first rising edge
of TM7IO (in the input at IGBT falling edge), the dead time is the setting value in TM7DPR1 + 2 cycles. (The
dead time is one count longer than the normal.)
IX - 58 IGBT Output with Dead Time