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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3276 датащи(PDF) 12 Page - STMicroelectronics |
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AN3276 датащи(HTML) 12 Page - STMicroelectronics |
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12 / 22 page  The new ST solution - BC2: energy recovery circuit AN3276 12/22 Doc ID 17975 Rev 1 application boost current is shared between DB and D1 diodes. Therefore the conduction losses in the rectification stage are reduced. The reflected voltage VNS2 and D2 time conduction are given by: and The tD2_ON time trend supports the PFC application since the I1 current is largest when the Vmains voltage range is lowest. Thus the discontinuous mode could be guaranteed in the BC2 circuit even under the worst case PFC applications such as high output load current under the minimum Vmains voltage range. In addition, to cancel the D2 recovery current diode effect, the dI/dt_D2 is always low due to the low reflected voltage VNS2 given by: 2.2.6 Phase t4 to t5 Figure 13. Equivalent circuit t4 to t5 At t4, the current in the D2 reaches 0 A and then the BC 2 works like a conventional power boost converter. Only the boost diode DB conducts. Due to the reflected voltage of NS2, the voltage across the power switch is lower than VOUT. Thus the COSS capacitor is discharged in the bulk capacitor and power saving occurs as the transistor turns on at t0. 2 m 1 2 m ). V V ( V mains out 2 NS + − − = 2 m ). V V ( ) 2 m 1 .( L . I t mains out 1 ON _ 2 D − + − = L ). 2 m 1 ( 2 m ). V V ( dt D _ dI mains out 2 + − − ≈ Coss L DB D2 D1 Vmains NS2 NS1 I0 V OUT + - - + |
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