What is epwm
Author:Sun Hongyan Time:2021-07-20 08:05 Browse(341)
1. It is a new type of switching power supply
1. It is a new type of switching power supply.
2. It is a template.

What is epwm

it is an improved version of PWM http://www.ed-china.com/ART_ 8800023216_ 400011_ 500009_ TS_ 9728dda2. HTM.
LCD TV epwm generally refers to the internal pulse frequency control module of LCD TV.
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1 Epwm module has seven modules in total:
(1) time reference module ------ TB.
(2) counter comparison module ------ CC.
(3) action limit module ------ aq.
(4) dead time control module ------ dB.
(5) PWM chopper module ------ PC.
(6) error control module ------ TZ.
(4) dead time control module ------ dB.
(5) PWM chopper module ------ PC.
(6) error control module ------ TZ.
(4) error control module ------ TZ.
(5) (7) Event trigger module: EZ.
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2. The functions of each module are as follows:
TB: to generate the constant reference tbclk for the output PWM.
configure the clock reference counter tbctr of PWM, set the counting mode of the counter, configure the hardware or software synchronous clock reference counter, and determine the epwm synchronous signal output source<
CC: determine the PWM duty cycle.
and the switching time of high and low level of epwm output<
AQ: when the counter and the comparison register are matched, the action will be generated.
that is, the high and low level switching of epwm
DB: configure the delay time of the rising or falling edge of the output PWM.
the A and B channels can also be configured in the complementary mode. The inverter I made is to configure the epwm in the complementary mode.
the dead time can be determined by programming
PC: generate high frequency PWM carrier signal
TZ: when an external error signal is generated.
the PWM output is processed accordingly, such as full set high, or pull low, or set to high resistance state, so as to play a protective role.
of course, this function can also be generated by software enable epwm to trigger ADC sampling, determine the speed of event generation and trigger, and clear related event flag bits.
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3. The seven modules of epwm module are like a production line.
one level by one process, but DSP is more advanced, which can be configured to make epwm only pass through the production line I choose, For example,
the dead time control module can be needed or not, which depends on whether the actual system needs it or not.
in the actual use of epwm.
normally, only TB, CC, AQ, DB and et modules need to be configured.
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in the actual use of epwm
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