Honda CB350 CL350 [122/219] Power circuit

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5 4 POWER CIRCUIT 111 C Selenium Rectifier Rectifier is a device which changes the A C alternating current to D C direct current and is used in conjunction with an alternator or A C generating coil The principle of its rectification function is that it permits the current to flow in one direction but allows only a very small amount to flow in the reverse direction The type rectifier most commonly used are the selenium silicon and germanium rectifiers Fig 5 34 Selenium rectifier stuck The rectifying element of the selenium rectifier is an assembly consisting of selenium wafers as terminal plates and spacers in the proper quantity and connected in either parallel or series depending upon the direction of rectification Fig 5 34 As shown in the figure to the right the rectifier wafers are either circular or square nickel plated steel or aluminum sheet vacuum coated with highly purified selenium combined with proper amount of foreign element and heat treated under controlled condition to produce a metallic selenium on which cadmium bismuth and tin are applied An electric charge is passed in the opposite direction to the arrow shown in Fig 5 35 to set up an electrochemical reaction This will allow the current to readily flow in one direction while creating a large resistance of several thousand times in the opposite direction permitting only a negligible flow This is the rectifying function of the selenium wafer Fig 5 35 Humidity has a deteriorating effect on the selenum wafer therefore waterproof coating is applied to the rectifier this will also prevent corrosion The symbol shown in Fig 5 36 is used to designate the rectifier This indicates that the rectifier consists of one or more selenium wafers arranged in either series or parallel and the direction of the arrow indicates the normal direction of current flow Selenium rectifier is durable and since it does not deteriorate withj age or usage its life is practically infinite It is relatively efficient for use with low voltage load therefore it has found broad usage as a small rectifier Further it has a high overload capacity for a short period of time as compared to the silicon or germanium type rectifiers and its long service life is another advantage CD Coating which prevents short circuits Anti electrode D Selenium Sheet 5 Positive direction Fig 5 35 Construction of selenium rectifier

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