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开关电源是一种电压转换电路，主要的工作内容是升压和降压，广泛应用于现代电子产品。因为开关三极管总是工作在 “开” 和“关” 的状态，所以叫开关电源。开关电源实质就是一个振荡电路，这种转换电能的方式，不仅应用在电源电路，在其它的电路应用也很普遍，如液晶显示器的背光电路、日光灯等。开关电源与变压器相比具有*、稳性好、体积小等优点，缺点是功率相对较小，而且会对电路产生高频干扰，变压器反馈式振荡电路，能产生有规律的脉冲电流或电压的电路叫振荡电路，变压器反馈式振荡电路就是能满足这种条件的电路。
开关电源工作原理
开关式稳压电源接控制方式分为调宽式和调频式两种，在实际的应用中，调宽式使用得较多，在目前开发和使用的开关电源集成电路中，绝大多数也为脉宽调制型。因此下面就主要介绍调宽式开关稳压电源。
对于单极性矩形脉冲来说，其直流平均电压Uo取决于矩形脉冲的宽度，脉冲越宽，其直流平均电压值就越高。直流平均电压Ｕ。可由公式计算，即Uo＝Um×T1／T式中Um为矩形脉冲大电压值；T为矩形脉冲周期；T1为矩形脉冲宽度。
从上式可以看出，当Um 与T 不变时，直流平均电压Uo 将与脉冲宽度T1 成正比。这样，只要我们设法使脉冲宽度随稳压电源输出电压的增高而变窄，就可以达到稳定电压的目的。
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BARBER COLMAN 560 TEMPERATURE CONTROL
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Barber Colman EHV Power Supply 907A #35417
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QTY.1 BARBER-COLMAN 7HF931123000 CONTOLLER - NEW
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Barber Colman Series 560A Temperature Controller
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BARBER COLMAN THC-2 NSFP THC2
BARBER COLMAN 558A-00031-001-0-00 USPP 558A00031001000
BARBER COLMAN AE-394 USPP AE394
Barber Colman EHV Power Supply 907A-00000 #35421
Barber Colman Temperature Controller 2204E/NS/VH
BARBER COLMAN AK-42309-500 NSFP AK42309500
BARBER COLMAN MAQ1-34001-000-5-00 USPP MAQ134001000500
BARBER COLMAN HC-201 NSFP HC201
BARBER COLMAN AD8201 USPP AD8201
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BARBER COLMAN TC-1161-404 NSFP TC1161404
BARBER COLMAN MK-3101-0-2 NSPP MK310102
BARBER COLMAN TK-1101-403-2 NSPP TK11014032
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BARBER-COLMAN 2204/NS/VH/XX/XX/RF/FR/XX/XX/XXX/AX143
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Appleton Electric Company GR Series Outlet Box With Barber Colman Barcopac!
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BARBER COLMAN CP-8511-102 USPP CP8511102
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Barber Colman Temperature Controller 7SF931123000
BARBER COLMAN TK-1101-404-2 NSPP TK11014042
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BARBER COLMAN TKR-5001 NSFP TKR5001
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Barber Colman 121L-10017-001-0-00 Temp Control
barber-colman 560 digital temperature controller,
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Barcol Barber Colman Beautiful 1930s Vintage 9" Bakelite Electric Fan-Rare
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Barber-Colman Temperature Controller Model# 560 A!
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2 Barber-Colman Part# MAE8-01900 Temperature Controller
1 NEW BARBER COLMAN 72A-2787-2-6 CONTROLLER M5
Barber Colman Temperature Control 585A-00016-000-0-00 #35731
Barber Colman Current to Position Converter 658B-00001 4-20mA Input
Barber Colman A-11972 Interlock Relay W/ Circuit Board
Barber-Colman 560 Temperature Controller
BARBER COLMAN AX143 USPP AX143
BARBER-COLMAN CONTROLLER AX143,
Barber Colman 80CC-11001-101-V-00, Sequence Module Maco 8000
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BARBER COLMAN TK-1101-404-2 USPP TK11014042
BARBER COLMAN TKR-1001 USPP TKR1001
BARBER COLMAN MK-4621-0-0-2 USPP MK4621002
BARBER COLMAN AV-650 NSFP AV650
BARBER COLMAN VB-7211-000-3-06 NSFP VB7211000306
Barber-Colman MAQ1-01900-102-0 Temperature Controller
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Barber Colman Co 907A Power Supply 120 Volt 40 VA
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BARBER-COLMAN 7PD045400100 **
BARBER COLMAN A-13050-000-0-20 USPP A13050000020
BARBER COLMAN A-13068 USPP A13068
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BARBER COLMAN AD-8812 NSFP AD8812
Invensys Barber-Colman EA57 Actuator 120v .65a
BARBER COLMAN M572-5311 NSFP M5725311
BARBER COLMAN TKS-8014-0-1 NSFP TKS801401
BARBER COLMAN TC-1103-403 NSFP TC1103403
Barber Colman 80DA-00001-001-0-00 Maco 8000 #5491
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Barber-Colman Temperature Controller 180185A000160000
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BARBER COLMAN PC-301 NSFP PC301
Barber Colman Sequence Module 80CC-11001-101-V-00
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BARBER COLMAN 72E-2787-2-6 USPP 72E278726
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BARBER COLMAN AT-506-0-1 NSPP AT50601
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Barber-Colman 520 Solid State Controller
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BARBER-COLMAN 580 PLEASE SEE DESCRIPTION!
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Barber-Colman: DB21-00024-000-0-00 Temp. Controller
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BARBER COLMAN AK-51642 NSFP AK51642
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Barber Colman A-11844 Maco IV Temperature #5831
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BARBER COLMAN A-12042-1 PC VOLTAGE BOARD NEW*
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BARBER COLMAN AM-348 USPP AM348
Barber Colman A-13034-4 Maco 8000 PC Board #20520
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Barber Colman A-12501 Maco 8000 PC Board #20540
Barber-Colman Series 18 18QT-TJFE1-201-0-00 PRO Plus Temperature Controller 18Q
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BARBER-COLMAN CC-8104 FOUR-STAGE SEQUENCER 24V NEW NIB
Barber Colman 2 Stage Relay (120V) CC-8102 (CC8102) ** NEW **
BARBER COLMAN A-11779-101 USPP A11779101
BARBER COLMAN PC-132 USPP PC132
BARBER COLMAN ADDA-902-5 USPP ADDA9025
Barber Colman Current to Position Converter 658B-00001 4-20mA Input
Barber Colman 523B-4XXXX-X3X Temperature Control
BARBER COLMAN 561A-0216-100-0 *NICE*
BARBER COLMAN T249 USPP T249
Barber-Colman Model 10Q8-0KF00-00F-0-00 Temp Control
Barber-Colman Temperature Control # 10E8-6JF00-00F-00
BARBER COLMAN AK-51642 USPP AK51642
Barber-Colman: DB21-00024-000-0-00 Temp. Controller
BARBER COLMAN P021-41706-012-1-05 USPP P02141706012105
New Barber Colman Three Stage Bulb Thermostat TC-282-127
Barber-Colman-7SF931123000
BARBER COLMAN 4460.079.3 NSFP 44600793
Barber Colman Memory Board A-33-1058-1 NEW-NO BOX
BARBER COLMAN AE-1105 NSFP AE1105
BARBER COLMAN SK-10204 USPP SK10204
BARBER COLMAN SK-10203 USPP SK10203
BARBER COLMAN 24-36 USPP 2436
Barber Colman A-60090 Maco 4000 PC Board #20005
BARBER COLMAN AT-211 NSFP AT211
BARBER COLMAN TS-90230-850-0-1 USPP TS9023085001
BARBER COLMAN V-42-122 NSPP V42122
Barber Colman Temperature Control MAE1-00300-000-8-00 #37944
BARBER COLMAN HD40-0000J-000-H-02 NSFP HD400000J000H02
BARBER COLMAN A-10528-100-0-05 USPP A10528100005
BARBER COLMAN AT-211 NSPP AT211
Barber Colman 1256 Temperature Control
BARBER COLMAN 4460.079.3 USPP 44600793
BARBER COLMAN ENCL-100 USPP ENCL100
BARBER COLMAN M226-10012-000-7-27 NSPP M22610012000727
Barber Colman Temperature Controller 585C-00056-000-6-05 #33821
BARBER COLMAN P011-33112-084-2-00 NSPP P01133112084200
Barber Colman A-60090-1 Input PC Upper Board #16289
BARBER COLMAN P011-33300-096-6-00 NSPP P01133300096600
BARBER COLMAN HD40-000J-000-H-03 NSPP HD40000J000H03
BARBER COLMAN A-07182-100-0-36 USPP A07182100036
BARBER-COLMAN 121A-13551 *NNB*
BARBER COLMAN AM-601-00-2 NSPP AM601002
BARBER COLMAN HD41-0000J-000-0-05 NSPP HD410000J000005
BARBER COLMAN AD-8969-952 USPP AD8969952
BARBER COLMAN ASP-522-02 NSFP ASP52202
BARBER COLMAN P011-33300-264-6-00 USPP P01133300264600
BARBER COLMAN P011-33100-048-4-09 USPP P01133100048409
Barber Colman Temperature Controller 585C-00056-000-6-05 #34469
Barber-Colman Co. 658A-00001 Converter
Invensys Barber Colman AK-52101 Logic Module AK52101
BARBER COLMAN P011-33300-096-6-00 USPP P01133300096600
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