《家用商用及其他类似用途音频视频教学幻灯片》由会员分享，可在线阅读，更多相关《家用商用及其他类似用途音频视频教学幻灯片（273页珍藏版）》请在金锄头文库上搜索。
1、1,AUDIO/VIDEO 5 V 2 A; 12 V, 0.5 A outputs. The following illustrates the disassembly of a switch mode type that is layer wound and provided with a ferrite core.图示为某开关电源 1. Remove the outerwrap and make a note of the number of layers either by marking the tape or making a mental note.剥外层胶带,记录层数,124,
2、TRANSFORMER CONSTRUCTION ANALYSIS (EXERCISE 9),2. Remove all layers of the tape down to the winding. Use the ruler to measure the creepage distance. i.e., the width of the margin tape, commonly referred to as “end margin”.测量“边缘胶带”宽度 3. Remove the rest of the winding from the coil.去除绕组 4. Repeat step
3、s 1, 2 and 3 for the next two windings.对各个绕组都进行上述测量 5. Complete the information given below and complete answers on the next to next page. 填写下述空格 Number of outerwrap layers 外层胶带层数 = _ Number of layers between Pri and Sec初/次间胶带层数= _ Width of margin tape between边缘胶带宽度 primary and secondary 初/次 = _ mm
4、and _ mm Measured clearance = Creepage = _ mm 绝缘距离,125,EXERCISE 9练习9,Margin Tape边缘胶带,BOBBIN,1 layer1层,3 layers3层,Secondary 2第二次级,3 layers,Secondary 1第一次级,1 layer,Primary初级,3,1,2,Sec.,Primary,Sec.,Outer wrap,+,A,B,Clearance = Creepage = A + B,Outer wrap外层胶带,C,Clearance = Creepage = A + C,126,SAMPLE P
5、RODUCT SPACING (练习10)(EXERCISE 10),a). What are the requirements for a single solid sheet of insulation that is located between the trace side of a printed wiring board having primary potentials and an accessible metal enclosure. The apparatus has a rated supply voltage of 240 V ac and provides a cl
6、earance (through-air spacing) of 5.5 mm. b). The insulation on primary internal wiring is employed to insulate the conductors from an earthed metal enclosure of an audio amplifier. The potential on the primary conductors is 130 V ac and carries a current of 3 A. The internal wiring is 18 AWG. What i
7、s the required minimum thickness of the wire insulation?,+,127,Additional ExercisesSee Handout,128,TEMPERATURE AND LEAKAGE温度和漏电,Module 7 模块 7,129,TEMPERATURE AND LEAKAGE,Temperature Or Risk of Fire温度导致失火,Leakage Or Risk of Shock漏电导致触电,130,TEMPERATURE AND LEAKAGE,What are normal operating conditions?
8、 正常工作状态,131,TEMPERATURE AND LEAKAGE,Clause 4条款4 - General Test Conditions通用测试条件 Type tests (2.8.1)形式测试 Ambient temperature between 15 & 35 degree C环境温度摄氏1535度 Relative Humidity of 75% maximum最大相对湿度75%,132,NORMAL OPERATING CONDITIONS,Position without impeding ventilation不通风 Any position of controls各种
9、控制设置 Position per manufacturers instructions参考生产厂家指示 -or- Test in wooden box在木箱内,Most unfavorable combination of:最劣工作情况,133,NORMAL OPERATING CONDITIONS,Supply voltage of试验电源: 0.9 -1.06 times rated 额定的0.9-1.06(IEC 60065) 0.9-1.1 times rated 额定的0.9-1.1(UL 6500) Marked rated frequency额定频率 Any position
10、of controls各种运行方式 Motor tested in accordance with instructions or under conditions reasonably assumed 电极测试参考说明书和适当的假设(4.2.5),134,NORMAL OPERATING CONDITIONS,Battery Charger充电器 Loaded or not有无负载 According to instructions参考说明书 With or without legs or stands (4.2.12)有无支架,135,NORMAL OPERATING CONDITIONS
11、 FOR AUDIO 音频功放AMPLIFIERS,Tested with standard signal consisting of pink noise夹杂有随机噪声的标准信号 Operated to deliver one of the following conditions下列工作情况任选: 1/8 non-clipped output power1/8 满功耗无钳压输出 1/8 maximum obtainable output power1/8 最大输出 Maximum power that permits continuous operation when redundant
12、protection is provided若有额外保护,最大持续输出,136,TEMPERATURE,Clause 7 - Heating Under Normal Operating Conditions正常工作温度要求 No part shall attain an unsafe temperature各个地方都不超过安全限度 Steady state assumed after 4 hours of operation一般认为开机4小时后温度稳定 Temperatures measured by change of resistance or other suitable method
13、可用电阻法或其他适用方法测量 Fuses, circuit breakers shall not operate过程中保险丝,断路器不应动作,137,TEMPERATURE,Table 2表2 IEC 60065 & UL 6500,138,TEMPERATURE,Temperature Limits 温度限度- Table 2 Based primarily upon materials基于材料 Rise given in K 采用K氏温标,139,SHOCK,Risk Of Shock触电危险 Clause 9 - Shock Hazard under Normal Operating C
14、onditions条款9-正常工作条件下的触电危险 Accessible parts shall not be live可接触金属不应带电,140,SHOCK,UL 6500 Accessibility of Live Parts Standard Test Finger - Figure 14 图14 UL6500 标准测试指 Use for用途: Accessibility of Live Parts in 根据Clause 9.1.1确定金属部件是否可接触 Determination of Creepage and Clearances in 根据Clause 13.1.1确定绝缘距离,
15、141,SHOCK,UL 6500 What is considered live? 如何决定带电 Open circuit voltage of 35 v peak (60 v dc)开路电压峰值36V(直流60V) -and- Current exceeds电流超过 0.5 MIU for 2 or 3 wire apparatus 0.5MIU(2或是线制产品) -or- 0.75 MIU for a permanently connected apparatus or 3 wire stationary apparatus 0.75MIU (永久连接型产品或3线制固定使用产品)-or-
16、 1.5 MIU to earth for class I cord connected commercial audio amplifier designed solely for rack mounting or stationary use1.5MIU(所有I类商业用带安装架或固定使用带电源线音频功放),142,SHOCK,IEC 60065 What is considered live?如何决定带电 Open circuit voltage of 35 v peak (60 v dc)开路电压峰值36V(直流60V) -and- Current exceeds电流超过 0.7 mA (peak) a.c. and 2.0 mA d.c. 70 mA (peak) a.c. for fre
