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| 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)： | 24/72頁(yè) |
| 文件大小： | 1177K |
| 代理商： | DRM011 |
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Vacuum Cleaner Reference Design
Designer Reference Manual
DRM010 — Rev 0
24
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
This simple control method is sufficient for most universal motors and
other loads. More complex forms of phase angle control compensate for
the inductive load or provide sensorless speed control of a universal
motor. Closed loop speed control might use a PID (proportional integral
derivative) loop or fuzzy logic algorithm. A vacuum cleaner normally
does not require this level of complexity.
1.5 Triac Drive Waveform
The key task of the phase angle control software is to provide the trigger
pulse for the triac. The software must synchronize to the ac line voltage
and fire the triac at the desired angle. The design of the triac firing pulse
requires some basic knowledge of the operation of triacs.
Triacs are a latching bilateral switching device. When the triac is off, it
will block voltage in both directions. Once a triac has been fired, it will
latch in the on state and continue to conduct until the current decreases
to zero. The current for an ac load naturally crosses zero every half
cycle. Zero current turn off is in fact desirable and minimizes any
inductive kickback voltage. The triac will not latch on until after the
voltage has increased to above its rated latching voltage and the current
has increased to greater than its rated latching current. Once latched,
the triac will stay on until the current has decreased to below the rated
holding current. For these triac specifications, contact ON
Semiconductor at http://www.onsemi.com. The document order number
is MAC12SM/D.
Because the current passes through zero, the triac must be refired every
half cycle. The triac is fired by applying a trigger pulse to the gate
terminal. A negative gate current is desired for most triacs because the
trigger current is much higher using a positive trigger, in particular when
the load voltage is negative. The duration of the trigger pulse must be
long enough for the load current to reach the triac’s rated latching
current. Once the triac has latched, there is no need to continue to
supply trigger current.
The ac line voltage zero crossing is easily measured using a simple
circuit as shown in
Figure 1-6
. The load current is not so easily
F
Freescale Semiconductor, Inc.
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.
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參數(shù)描述 |
|---|---|
| DRM10 | 功能描述:DIP 開(kāi)關(guān)/ SIP 開(kāi)關(guān) BCD 10 POS RoHS:否 制造商:Omron Electronics 位置數(shù)量:10 開(kāi)關(guān)類型:DIP 執(zhí)行器:Rotary 端子節(jié)距:2.54 mm 觸點(diǎn)形式: 端接類型:Solder Pin 電流額定值:100 mA 電壓額定值 DC: 工作溫度范圍: 安裝:Through Hole |
| DRM1004 | 功能描述:DIP 開(kāi)關(guān)/ SIP 開(kāi)關(guān) ROTARY DIP SWITCH PLASTICSHAFT RoHS:否 制造商:Omron Electronics 位置數(shù)量:10 開(kāi)關(guān)類型:DIP 執(zhí)行器:Rotary 端子節(jié)距:2.54 mm 觸點(diǎn)形式: 端接類型:Solder Pin 電流額定值:100 mA 電壓額定值 DC: 工作溫度范圍: 安裝:Through Hole |
| DRM101 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Blood Pressure Monitor Using the Flexis QE128 Family |
| DRM10C | 功能描述:SWITCH DIP MINI SHAFT 10POS T/H RoHS:否 類別:開(kāi)關(guān) >> DIP 系列:DR 特色產(chǎn)品:RDM Series Rotary DIP Switch 標(biāo)準(zhǔn)包裝:70 系列:RDM 電路:十六進(jìn)制 位置數(shù):16 觸點(diǎn)額定電壓:0.1A @ 42VDC 觸動(dòng)器類型:用于工具旋轉(zhuǎn) 觸動(dòng)器電平:凹槽式 安裝類型:通孔 方向:頂部觸動(dòng) 可清洗:是 其它名稱:EG4977-5RDMAR16PIT |
| DRM10C04 | 功能描述:編碼式波段開(kāi)關(guān) SW DIP MINI SHAFT 10POS T/H RoHS:否 制造商:C&K Components 位置數(shù)量:10 輸出代碼:Binary Coded Decimal 執(zhí)行器:Screwdriver 觸點(diǎn)額定值: 端接類型:Solder Pin 封裝:Tube |
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