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)： 27/72頁(yè)
文件大?。?/td> 1177K
代理商： DRM011
Vacuum Cleaner Reference Design
Vacuum Software
DRM010 — Rev 0
Designer Reference Manual
MOTOROLA
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
27
However, small phase angles are needed in some applications. A
vacuum cleaner universal motor has a very low impedance when the
rotor is not moving. If the initial voltage is too high, a high current surge
will result. Experiments have shown that a minimum phase angle of
about 5
°
is low enough to provide smooth starting. This is essential to
minimize the startup surge current.
Because the current is lagging the voltage, full speed will occur before
180
°
. The last few degrees do not provide any variation in the motor
speed. It is not crucial to go all the way to the zero crossing. Some delay
between the zero crossing and triac firing is generally acceptable for
inductive loads.
The desired triac firing pattern is summarized in the
Table 1-1
.
1.6 Vacuum Software
Software has been developed for basic vacuum cleaner universal motor
control. This software was developed for the HC908KX8. The software
will run on any HC08 MCU that has at least a 2-channel timer and an
ADC. The HC908KX8 also features an internal oscillator and a small
16-pin package. The software is compatible with the internal oscillator or
other low-cost RC oscillators.
The 2-channel timer provides all the necessary timing control for the
software. One channel is used for an input capture to measure the ac
line zero crossing. The second channel is configured as an output
compare and is used to control the timing of the triac pulse.
The software is written in C language. There are numerous advantages
to programming in C, even for small microcontrollers. For instance, the
Table 1-1. Triac Pulse Generation
Phase Angle
Action
0
°
<
φ
< 5
°
None
5
°
<
φ
< 135°
°
Short pulse at
φ
135
°
φ
< 175
°
Turn on at
φ
; turn off at 135
°
φ
> 135
°
Turn on ASAP; turn off at 135
°
F
Freescale Semiconductor, Inc.
n
.
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