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Circuit and method independent of frequency and voltage deviations of supply voltage, and display apparatus incorporating same circuit
Circuit and method independent of frequency and voltage deviations of supply voltage, and display apparatus incorporating same circuit
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机译:与电源电压的频率和电压偏差无关的电路和方法,以及具有该电路的显示装置
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摘要
A degaussing circuit includes an AC mains voltage, a series arrangement of a degaussing coil (Ld) and a switching element (S1) coupled between the input terminals (it1,it2). A measuring circuit (3) continuously measures a value (Ms) representing an actual value of either the degaussing current (Id) through the degaussing coil (Ld) or the AC mains voltage (Vac). A detecting circuit (2) detects a level crossing instant (ts) at which the actual value (Ms) crosses a predetermined value (Vref2). A control circuit (1) determines a switching instant (tei,tstv) of the switching element (S1) in response to the level crossing instant (ts) for generating a peak value of the degaussing current (Id) related to the actual value of the degaussing current (Id) or the AC mains voltage (Vac) at the level crossing instant (ts).
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