Freescale Semiconductor M68HC08 manual Flow Chart Main Flow, Part

Page 50

Software Design

4

Run mode

Set Dimming value and Dimming value array

to minimal value

Set zero current checking interval counter

(currFltMS)

Set values of PI PFC stage regulator for run mode:

-proportionalGain = PI_KP_RUN;

-integralGain = PI_KI_RUN;

1

yes

Measure lamp currents

Has 1ms gone?

yes

Is time to measure Dimming value ?

yes

Get dimming value and compute moving avg. filter

no

Is current through Tube1 or Tube2 zero ?

Test DC-BUS voltage on limits

Is enabled PI PFC stage regulator calculation ?

no

yes

no

Reset current checking interval counter

no

yes

Calculate PI PFC stage regulator for reference sine gain

no

Is enabled PI ballast stage

 

 

 

no

regulator calculation ?

 

 

 

yes

Control lamp currents

Has zero current checking

interval gone?

no

Trimming internal oscillator

yes

Is attemp to start > 0 ?

yes

1

no

faultISR()

Figure 5-10. Flow Chart — Main Flow, Part 4

Dimmable Light Ballast with Power Factor Correction, Rev. 1

50

Freescale Semiconductor

Page 49 Page 51
Image 50
Page 49 Page 51
Contents Dimmable Light Ballast with Power Factor Correction Page Dimmable Light Ballast with Power Factor Correction Designer Reference ManualDraft 2 for Review Chapter Reference Design Contents Chapter IntroductionChapter Control Theory Chapter Hardware DesignChapter Software Design Chapter Demo SetupAppendix A. Schematics and Part List Appendix B. ReferencesBenefits of this Solution IntroductionMC68HC908LB8 Microcontroller MC68HC908LB8 Microcontroller Freescale Semiconductor Fluorescent Lamp Control Theory Fluorescent Lamp OperationTypical Low Pressure Fluorescent Tube I/V Characteristic Controlling the Fluorescent Lamp Typical Fluorescent Tube Equivalent Circuit in Steady StateControl Theory Main Characteristics of the Dual Switch Topologies PFC Control TheoryDigital Power Factor Concept Hysteresis Current Control Mode Digital Power Factor Concept Discontinuous Conduction Mode Hysteresis Current Control Mode Current WaveformDiscontinuous Conduction Mode Principle Concept Summary Generated Input Current WaveformFreescale Semiconductor Dimmable Light Ballast Characteristics Application OutlineLight Ballast Characteristics Application DescriptionPower Factor Correction Light Ballast ControlProtection Features Software SpecificationHardware Specification Software SpecificationHardware Implementation System ModulesInput and PFC Dimmable Light Ballast Input and PFC Inverter Dimmable Light Ballast Inverter Microcontroller Dimmable Light Ballast Microcontroller J1 Luminance HeaderJ2 Interface Header Power Supply Supplied VoltagesFreescale Semiconductor Chapter Software Design Control Algorithm DescriptionPower Factor Correction Control DC-bus Voltage ControlTube Start Mode Roundi tmin ⋅ AD max ⁄ i max Initialization Setup Software ImplementationPWM Setup PWM Frequency = BusFrequency Hz Hz Main Program Loop Synchronization Interrupt Routine Sine Wave Generation Interrupt RoutineFlow Chart Sine Wave Generation Interrupt Routine Fault Detection and Processing Flow Chart timovISR and faultISR Detailed Software DescriptionFlow Chart Main Flow, Part Reference sine gain Yes Is preheat frequency reached? Has 1ms gone? 10. Flow Chart Main Flow, Part Program and Data Memory Usage Microcontroller UsageMicrocontroller Peripheral Usage Memory UsageI/O Usage Definitions of Constants and Variables3 I/O Usage System Setup Definitions Represents the number of fault states during run mode Defines the minimum HRP frequency in kHz during run modeDefines the maximum HRP frequency in kHz during run mode Represents the number of fault states during tube ignitionSystem Constants and Variables Extern tSWFLAGS SwflagsExtern tU08 CurrT1 Required Software Tools Hardware SetupSoftware Setup Building and Uploading the Application\prm\P&EFCSlinker.prm, linker program file Executing the ApplicationProject Files \Sources\main.c, main programAppendix A. Schematics and Part List Schematics7mH 7mH Figure A-3. Inverter TOP BOT TOP Figure A-6. Power supply Parts List Table A-1. Printed Circuit Board Parts ListInternational IRF830A Dimmable Light Ballast with Power Factor Correction, Rev Appendix B. References Dimmable Light Ballast with Power Factor Correction, Rev Page How to Reach Us
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M68HC08 specifications

Freescale Semiconductor, known for its innovative solutions in the field of embedded systems, developed the M68HC08 microcontroller family, which includes the MC68HC908QT2. This 8-bit microcontroller is engineered to meet the demands of diverse applications, including automotive, industrial, and consumer electronics.

The MC68HC908QT2 is designed around Freescale’s M68HC08 core, which is renowned for its efficient and reliable performance. This microcontroller integrates a powerful instruction set, enabling developers to create high-performance applications with relatively low power consumption. The device operates at a clock frequency of up to 3 MHz, which is adequate for various control tasks.

One of the key features of the MC68HC908QT2 is its memory architecture. It includes a 2 KB Flash memory for program storage, representing a significant advantage for developers requiring non-volatile memory. Additionally, it encompasses 128 bytes of EEPROM memory, allowing for data retention even after power loss. The microcontroller also has 256 bytes of RAM for efficient data manipulation during operation.

In terms of input/output capabilities, the MC68HC908QT2 supports a variety of interfacing options. The microcontroller features up to 20 general-purpose I/O pins for flexibility in connecting with peripheral devices. Additionally, it provides multiple analog-to-digital converters (ADC) and timers that facilitate efficient analog signal processing and precise control through timing functions.

The architecture of the MC68HC908QT2 also incorporates sophisticated on-chip peripherals, enhancing its functionality. These peripherals include PWM (Pulse Width Modulation) outputs, which are essential for applications requiring motor control and other precise duty cycle processes. The integrated watchdog timer ensures reliable operation by resetting the system in the event of an application failure.

Moreover, the MC68HC908QT2 is equipped with an efficient power management system, enabling operation in a low-power mode, ideal for battery-powered applications. This microcontroller is packaged in a compact 28-pin dual in-line package (DIP), making it suitable for space-constrained designs.

In summary, the Freescale Semiconductor MC68HC908QT2 microcontroller is distinguished by its robust performance, extensive memory options, and versatile I/O capabilities. Its advanced features, including built-in timers, ADC, and a power management system, make it an exceptional choice for developers seeking to implement reliable and efficient embedded solutions. With its comprehensive architecture, the MC68HC908QT2 remains a popular choice in the landscape of 8-bit microcontrollers.
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