參數(shù)資料
型號(hào)： DRM011
英文描述： Direct Current Ignition Reference Design Designer Reference Manual
中文描述： 直流點(diǎn)火參考設(shè)計(jì)設(shè)計(jì)參考手冊(cè)
文件頁(yè)數(shù)： 30/72頁(yè)
文件大?。?/td> 1177K
代理商： DRM011
Vacuum Cleaner Reference Design
Designer Reference Manual
DRM010 — Rev 0
30
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
An LED is used for debugging to indicate when the software has locked
onto the line frequency.
The triac pulses are scheduled by the input capture interrupt service
routine.
If the phase is less than 5
°
, the triac is not pulsed.
If the phase is less than 135
°
, a short pulse is used.
If the phase is greater than 135
°
, a long pulse is used.
The pulse function calculates the desired rising and falling edges for
each case. The long pulse function also checks the current time. If the
desired time has already expired, the rising edge will be scheduled as
soon as possible (ASAP). The input capture function sets up the output
compare to generate the rising edge. The time for the falling edge is
calculated and saved for use by the output compare function.
1.8 Output Compare
The output compare interrupt service routine is called for both rising and
falling edges of the triac pulse. The output compare fires the triac and
also turns off the gate pulse at the pre-determined time. If the output
compare was called as a result of the output compare being set high, the
low edge will be scheduled using the saved off time. Otherwise, the
output compare will be disabled.
This method of using the output compare to schedule subsequent output
compares is extremely powerful. Using software, the output compare
can be used to generate practically any desired series of pulses. Once
initiated, the output compare can generate these pulses autonomously.
1.9 Control Loop
The control loop function provides the basic motor control features.
First, the potentiometer is read using the ADC. This takes some time and
program execution will wait until the conversion complete flag has been
set. The analog-to-digital reading is from 0 to 255. The ADC also has
F
Freescale Semiconductor, Inc.
n
.
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