Honda CB125 CB160 (1972) [100/139] Refer to fig

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94 5 ELECTRICAL PARTS When current is applied to the silicon rectifying plement due to the characteristics of voltage drop in the positive direction intense heat is generated at the rectifying element section As the rectifying element section is small and easily damaged by intense heat the rectifying element must be fitted tightly to the cooling plate Thus protection in the form of heat dissipation due to the cooling plate is provided Refer to Fig 5 50 There are two types of rectifying elements employed in the silicon rectifiers one of which has the P layer fitted on the upper surface of the cooling plate element The other has theN layer also fitted on the upper surface of the cooling plate ele ment These are coupled Refer to Fig 5 51 and employed in construction Refer to Fig 5 51 I Feature comparison of silicon and selenium rectifiers Items Terminal Voltage Cell Direct Current Cell Admittance Tempe rature Contineous Instant Selenium Silicon is 100V 800V less than 30V 150 250V high selenium the front to back rectifier the ratio is is 92 ratio large In the and in the silicon rectifier the ratio is 98 2 In the selenium rectifier employed in two wheel vehicles weather resistance especially moisture re 10 80 C 20 150 C 30 times sec Max 4 times min 5 5 times sec Min 1 5 times min Efficiency Rectifier Max 90 Max 99 Voltage fluctuation Rectifier 8 12 2 3 Eddy Current 1 As forward resistance is low and back resistance 55 175 C 55 200 C Fig 5 52 Comparison of silicon and selenium rectifiers sistance presents a problem However the silicon rectifier is not affected by moisture 3 In the range of permitted operational temperature of selenium rectifiers the maximum temperature of the rectifier plate is 70 In comparison the tem perature range of the silicon rectifier is from 55 C to 150 C Especially at high temperatures this unit is suitable 4 As current in the back direction is low self discharge of the battery due to reverse current flow is also low even when the vehicle is not in use 1 to 10 ma of reverse current flow existing in the selenium rectifier is less than 0 1 ma in the silicon rectifier Refer to Fig 5 52

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