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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4444 датащи(PDF) 28 Page - STMicroelectronics |
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AN4444 датащи(HTML) 28 Page - STMicroelectronics |
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28 / 68 page  ST7590 reference design description AN4444 28/68 DocID025925 Rev 2 Center frequency for the series resonance can be calculated at first approximation as: Equation 2 provided that the C2 capacitance is much greater than the C5 capacitance. L1 is the series of L1 and the leakage inductance of the coupling transformer T1, adding about 1 µH to L1. The Q factor of this coupling circuit is driven by the mains line impedance: the choice of the L1 and C5 values, anyway, leads to a limited attenuation due to either a parasitic impedance or a resonance selectivity. If loaded with a 2 line impedance, the coupling circuit shows a Q factor equal to 1.2 and a -3 dB bandwidth of 56 kHz (typical values). Particular attention has been paid in choosing the line transformer. The required characteristics are listed in Table 5. In order to have a good signal transfer and minimize the insertion losses, it is recommended to choose a transformer with a primary (shunt) inductance of 0.5 mH or greater, a leakage inductance much smaller than L1 and a total DC resistance lower than 0.5 . Table 5. Line coupling transformer specifications Parameter Value Turn ratio 1:1 Shunt inductance ≥ 0.5 mH Leakage inductance ≤ 1.5 µH DC total resistance ≤ 0.5 DC saturation current ≥ 15 mA Inter-winding capacitance < 30 pF Withstanding voltage ≥ 4 kV for double insulation ≥ 1.5 kV for functional insulation kHz 58 2 1 5 ' 1 C L fc |
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