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Freescale Semiconductor M68HC08 manual Concept Summary, 8.Generated Input Current Waveform

Models: M68HC08

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PFC Control Theory

Figure 2-8. Generated Input Current Waveform

2.2.4 Concept Summary

Both the PFC solutions can be used for applications that do not require a large portion of the MCU’s resources, because they consume only a fraction of the MCU performance. Compared to a dedicated IC solution, digital PFC offers high flexibility and cost reduction in the overall design, as the PFC function can be provided within the MCU capability of the main application. Digital PFC also provides additional benefits such as a wide range of input voltages (85 V to 265 V AC) at a constant output DC voltage.

However, hysteresis current control mode is more suitable for power above 100W, and discontinuous conduction mode for low power consumption.

Dimmable Light Ballast with Power Factor Correction, Rev. 1

Freescale Semiconductor

Page 19

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Freescale Semiconductor M68HC08 manual Concept Summary, 8.Generated Input Current Waveform

Contents

M68HC08 Microcontrollers Designer Reference ManualDRM067 Rev. 1 12/2005 Page Designer Reference Manual Freescale Semiconductor Draft 2 for ReviewChapter Hardware Design Contents Chapter IntroductionChapter Control Theory Chapter Reference DesignAppendix B. References Chapter Demo SetupAppendix A. Schematics and Part List Chapter Software DesignChapter Introduction 1.2 Benefits of this Solution1.1 Introduction 1.3 The MC68HC908LB8 Microcontroller 7-bitkeyboard interrupt Freescale Semiconductor Introduction2.1.2 Fluorescent Lamp Operation Chapter Control Theory2.1 Introduction 2.1.1 Fluorescent Lamp Control TheoryGas filling mixture Freescale Semiconductor 2.1.3 Controlling the Fluorescent LampFreescale Semiconductor 2.2.1 Introduction 2.2PFC Control TheoryFreescale Semiconductor Freescale Semiconductor Zero MCU PWM PWM1 FAULT PINControl Theory DC Bus VoltageFigure 2-8.Generated Input Current Waveform 2.2.4 Concept SummaryFreescale Semiconductor Control TheoryChapter Reference Design 3.2 Dimmable Light Ballast Characteristics3.1 Application Outline Table 3-1.Light Ballast Characteristics 3.3 Application DescriptionMC68HC908LB8 3.3.2 Power Factor Correction3.3.1 Light Ballast Control CONTROL BOARD3.5 Hardware Specification 3.4 Software Specification3.3.3 Protection Features 4.1 Hardware Implementation Chapter Hardware Design4.2 System Modules Hardware Design 4.2.1 Input and PFCFigure 4-3.Dimmable Light Ballast - Input and PFC Freescale Semiconductor 4.2.2 InverterHALF BRIDGE Figure 4-4.Dimmable Light Ballast - InverterSystem Modules Freescale Semiconductor4.2.3 Microcontroller TOP BOT Comp Comp Out Zero Detect SignalSystem Modules Pin numberPin number SignalTable 4-2.J2 Interface Header Hardware DesignFigure 4-6.Dimmable Light Ballast - Power Supply 4.2.4 Power SupplyTable 4-3.Supplied Voltages Freescale Semiconductor Hardware Design5.1 Introduction Chapter Software Design5.2 Control Algorithm Description 5.2.1.1 DC-busVoltage Control 5.2.1 Power Factor Correction Control5.2.1.2 Phase Shift Synchronization 5.2.1.4 Generation of Output PFC Control SIgnal5.2.2.1 Tube Start Mode 5.2.2 Light Ballast Control5.2.2.2 Luminance Level Control Tube Run Mode rounditmax ⋅ ADmax ⁄ imax q = itADmin - A ⋅ ek ⋅ ADminireq = A ⋅ ek ⋅ ireqAD + q rounditmin ⋅ ADmax ⁄ imax5.3 Software Implementation 5.3.1 Initialization Setup5.3.1.1 PWM Setup Hz Hz 5.3.1.2 HRP SetupPWM Frequency = BusFrequency5.3.2 Main Program Loop 5.3.4 Sine Wave Generation Interrupt Routine 5.3.3 Synchronization Interrupt RoutineFreescale Semiconductor Read new PWM value from table * sineGain Set 1ms flag and reset 1ms counterSoftware Design interrupt void pwmISRvoid5.3.4.1 Fault Detection and Processing Stop HRP 5.4 Detailed Software DescriptionFigure 5-6.Flow Chart - timovISR and faultISR Software DesignDetailed Software Description Figure 5-7.Flow Chart - Main Flow, PartSoftware Design Figure 5-8.Flow Chart - Main Flow, PartFreescale Semiconductor Detailed Software Description Figure 5-9.Flow Chart - Main Flow, PartFreescale Semiconductor Software Design Figure 5-10.Flow Chart - Main Flow, PartFreescale Semiconductor 5.5.1 Microcontroller Peripheral Usage 5.5.1.1 High Resolution PWM HRP5.5.1.4 Timer Interface Module TIM 5.5 Microcontroller UsageI/O pin 5.6 Definitions of Constants and Variables5.5.3 I/O Usage Software Design5.6.1 System Setup Definitions defines the minimum HRP frequency in kHz 5.6.2 System Constants and Variables Page 6.2.1 Required Software Tools Chapter Demo Setup6.1 Hardware Setup 6.2 Software Setup\Sources\pi controller.c, PI regulators file 6.2.3 Executing the Application6.2.4 Project Files \prm\P&E FCS linker.prm, linker program fileA.1 Schematics Appendix A. Schematics and Part ListPFC Gate 2.7mHPFC Current Sense CompZero Detect PFC Current SenseComp PFC GateCOM LO Figure A-3.InverterDCB TOP BOT O1 O2 O3 O4 O5 O6 O7 O8Tube Voltage difference TOP BOT Comp - Comp Out Zero DetectSerial Data Serial Data DCB Divider Tube Current Tube CurrentTube Voltage difference GNDSerial Data5 Serial Data DCB Divider Tube Current Tube CurrentFigure A-6.Power supply DESCRIPTION A.2 Parts ListDESIGNATORS QUANTITYMANUFACTURER DESIGNATORSQUANTITY DESCRIPTIONFreescale Semiconductor Appendix B. References Freescale Semiconductor Page USA/Europe or Locations Not Listed How to Reach UsHome Page E-mail