DC(Direct current) Is the unidirectional flow of electric charge. Direct current is produced by sources such as batteries, power supplies, solar cells, or dynamos. Direct current may flow in a conductor such as a wire, but can also flow through semiconductors,insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current.The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage. Direct current may be obtained from an alternating current supply by use of a rectifier, which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction. Direct current may be converted into alternating current with an inverter or a motor-generator set.
测试标准：IEC61000-4-5 (ESD): 15KV (air) ;8KV (contact)
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