In gas heating systems flame rectification is used to detect presence of a flame.ĭepending on the type of alternating current supply and the arrangement of the rectifier circuit, the output voltage may require additional smoothing to produce a uniform steady voltage. As noted, detectors of radio signals serve as rectifiers. Rectification may serve in roles other than to generate direct current for use as a source of power. Rectifiers have many uses, but are often found serving as components of DC power supplies and high-voltage direct current power transmission systems. Early radio receivers, called crystal radios, used a " cat's whisker" of fine wire pressing on a crystal of galena (lead sulfide) to serve as a point-contact rectifier or "crystal detector". Historically, even synchronous electromechanical switches and motor-generator sets have been used. Physically, rectifiers take a number of forms, including vacuum tube diodes, wet chemical cells, mercury-arc valves, stacks of copper and selenium oxide plates, semiconductor diodes, silicon-controlled rectifiers and other silicon-based semiconductor switches. The process is known as rectification, since it "straightens" the direction of current. The reverse operation is performed by the inverter. The heavy threaded stud attaches the device to a heatsink to dissipate heat.Ī rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. A rectifier diode ( silicon controlled rectifier) and associated mounting hardware.
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