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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3112 датащи(PDF) 27 Page - STMicroelectronics |
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AN3112 датащи(HTML) 27 Page - STMicroelectronics |
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27 / 36 page  AN3112 Designing a fixed-off-time PFC Doc ID 16820 Rev 3 27/36 From the theory of the line modulation fixed off-time, TOFF increases with the line voltage so that at maximum line voltage the condition TON>TONmin [4] is always true. This is important in order to avoid line distortion [ 5]. Figure 16. Switching frequency function on the peak of the sinusoid input voltage waveform and the corresponding off- time value Now considering the two discharging resistors R and R0 of the circuit in Figure 6, the ratio is defined as: Equation 57 where 0 < K1 < 1. Through the definition of the k2 parameter the expected time constant τ =(R//R0)C is underlined, necessary for achieving the desired TOFF@90 Vac. Equation 58 Finding a way to obtain K1 and K2 means to gain the values of R and R0 and the discharging time constant of the capacitor C. The following section describes the mathematical way of obtaining the two parameters K1 and K2. Combining Equation 56, Equation 57, Equation 58 with the expression of the off- time ( Equation 5), the following expressions are obtained: R R R K 0 1 + = τ = ) VAC ( T K min OFF 2 |
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