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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3400 датащи(PDF) 21 Page - STMicroelectronics |
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AN3400 датащи(HTML) 21 Page - STMicroelectronics |
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21 / 78 page  AN3400 Steady-state stage-wise circuit analysis Doc ID 018840 Rev 1 21/78 to the minimum value whereas the voltage on the capacitor Cn keeps nearly constant. The final instant t6, from which the ICp capacitor current changes polarity, marks the change of the V(t) signal polarity and one-half of its period. In this stage, currents and voltages on the driving network are represented by the information in Figure 12, in which the charging/discharging effects of the reverse biased B-E junction capacitances, respectively, for the NPN and PNP devices, are neglected and so it is possible to approximate and . Figure 12. Fourth stage: dead time after NPN conduction phase According to the agreement of the previous image, the following equations are valid in the driving section during the dead time after the NPN conduction phase for t5<t<t6: System of equations 5 () ( )t I t I CCBn Bnpn ≅ () ()t I t I CBCp Bpnp ≅ AM09803v1 L c Cp Cn Cs Rs Rb Ls VRs IRs VCn VCp ICn ICp IRb VRb ILP Lp VDD Q1 Q2 D1 D2 VCs VC GND Dead time phase after NPN conduction ICCBn VCEn ICs ICBCp NPN base-collector junction capacitance charge PNP collector-base junction capacitance discharge ICCBn V NPN base-collector junction capacitance charge PNP collector-base junction capacitance discharge G ICBCp C () ( )t V t V C = () sat CEn CEn V t V − > () () () ( ) () ( ) 0 t V 0 t V t V V t V t V BEn CS CCBn DD EBn BEn < ⇒ > − − − = = − () () () () ( ) 0 t V 0 t V t V t V t V EBp CS CBCp BEp EBp < ⇒ > − = = − () ()dt t I C 1 V t V 6 t 5 t Cn n 1 Cnod Cn ∫ − = where () − = 5 Cn 1 Cnod t V V () ()dt t I C 1 V t V 6 t 5 t Cp p 1 Cpod Cp ∫ − = where () − = 5 Cp 1 Cpod t V V () () () t V dt d C t I Cn n Cn ⋅ − = () () ()t V dt d C t I Cp p Cp ⋅ − = () () () ( ) ()t I t I t I t I t I CS LP CBCp CCBn RS − = + = () () () t V dt d Cs t I CS CS ⋅ − = ( ) () () () ( )t V t V t V t V t V EBn BEp Rb Cp Cn + = = + () ( ) () ( )t V t V t V t V EBn Cn RS C − + − = |
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