參數(shù)資料
型號: DRM010
英文描述: Vacuum Cleaner Designer Reference Manual
中文描述: 吸塵器設(shè)計參考手冊
文件頁數(shù): 16/72頁
文件大?。?/td> 1177K
代理商: DRM010
Vacuum Cleaner Reference Design
Designer Reference Manual
DRM010 — Rev 0
16
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
1.3 System Design
A simple vacuum cleaner reference design is shown in
Figure 1-2
, and
a brief description of the circuit operation follows.
The HC908KX8 is used to generate the triac drive waveform and control
the speed of the motor. A potentiometer is used to vary the speed of the
motor. The MCU reads the potentiometer using one of the
analog-to-digital converter (ADC) port pins. A single port pin is used with
a timer input capture function to measure the ac line frequency and sync
to the ac line. The current injection into the MCU is limited, using a large
value resistor. Four port pins provide sufficient sink current to drive the
triac directly. A charge pump power supply is used to provide power for
the MCU and drive current for the triac. This type of power supply is
useful only up to about 20 mA. The supply current is limited by the size
of the ac line capacitor. A high-voltage non-polar capacitor is needed to
generate the ac current. A low-cost charge pump power supply does not
have sufficient current capability to drive status LEDs. A sensitive gate
triac can be used to minimize triac drive current. However, sensitive gate
triacs have a lower rate of voltage rise equal dv/dt rating and require a
more expensive snubber circuit.
Figure 1-2. Vacuum Cleaner Reference Design
MC68HC908KX8
V
SS
PTA1
PTA0
IRQ
PTB0/AD0
PTB1/AD1
PTB2/AD2
PTB3/AD3
1
2
3
4
5
6
7
8
V
SS
V
DD
V
DD
PTA4
PTA3/TCH1
PTA2/TCH0
PTB4/RxD
PTB5/TxD
PTB6/OSC1
PTB7/OSC2
16
15
14
13
12
11
10
9
V
DD
V
SS
+
V
DD
V
DD
V
SS
F
Freescale Semiconductor, Inc.
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.
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