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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2747 датащи(PDF) 32 Page - STMicroelectronics |
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AN2747 датащи(HTML) 32 Page - STMicroelectronics |
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32 / 44 page  PFC section design criteria AN2747 32/44 11 PFC section design criteria For PFC design criteria see AN 1875. 12 Full bridge design criteria The design of full bridge section involves the inductor (buck) component and device selection. 12.0.1 Inductor design The design specs are: 1. lamp current 2. lamp ripple current 3. lamp voltage 4. lamp ripple voltage The design steps are summarized below: 1. Fix the switching frequency fs and consequently the period Ts also is fixed. This frequency for power application is in the range 20 kHz ÷ 100 kHz 2. Fix the duty cycle estimation δ as 3. Fix the current ripple in the inductor L 4. Calculate the inductance value using the relation: Equation 9 For the inductance calculation: ● fs = 40 kHz, Ts = 25 s ● Vlamp =100 V ● Vbus = 400 V ● δ = 0.25 ● ∆I = 2 A Using these parameters the inductance value is 0.93 mH. For this project an inductance of 0.8 mH is used. 12.1 Filter capacitor To calculate the capacitor value that is in parallel to the lamp, the max current lamp ripple must be considered. The lamp current ripple must be limited in order to avoid acoustic resonance. In this application the current ripple was fixed at ∆Ilamp ± 5% of nominal current δ V out V input --------------- V lamp V bus --------------- = = L V lamp 1 δ – () T s ⋅⋅ I ∆ ----------------------------------------------- = |
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