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AN2459 Datasheet(PDF) 21 Page - STMicroelectronics

Part # AN2459
Description  Digital Power Factor Correction for Tube Lamp Ballasts
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2459 Datasheet(HTML) 21 Page - STMicroelectronics

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AN2459 - Application note
Signals measurement, processing & control
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Figure 15.
Lamp restart - behavior of the control loop
Note:
Brown = DC bus voltage; Blue = lamp filament current.
4.3
Zero Current Detection
Detection of a zero current crossing the PFC inductor is extremely important. As described
in Section 2: Power Factor Correction (PFC), a ZCD defines the moment when the switch
should be turned-on again. A well-known method used in other analog PFC applications has
been implemented for the digital ballast. The secondary winding of PFC inductor (1:10
winding ratio) gives a correct signal for the autoreload timer (Chapter 2.2). Typical signals
are shown in Figure 16.
Lamp removed
Lamp inserted



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