microcontrollers for lamp ballast at90pwm at8xc5114 n.
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MICROCONTROLLERS FOR LAMP BALLAST AT90PWM & AT8xC5114. Jean Desuché November 2006. Applications. Fluorescent Lamp. FL uorescent ballasts (Diffused light) Office buildings, Stores, Displays, Residential houses…. HID. H igh I ntensity D ischarge (HID) ballasts (Focused light)

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applications
Applications

Fluorescent

Lamp

  • FLuorescent ballasts (Diffused light)
    • Office buildings,
    • Stores,
    • Displays,
    • Residential houses…

HID

  • High Intensity Discharge (HID) ballasts (Focused light)
    • Street and exhibition lighting,
    • Car headlights,
    • Video Projection…

LED

  • Light Emitting Diodes (LED) ballasts
    • Signaling;
    • Automotive,
    • Displays.
at90pwm 5114 features summary
AT90PWM & 5114 features summary

All AT90PWM have : ISP, One pin DebugWire, RC oscillators,

64 MHz PLL for PSC & core (16 MHz), Vcc=2.7-5.5V

fluorescent lamp basics
Fluorescent lamp basics
  • Filament is heated (starter or magnetic coupling by adjusting PWM frequency
  • Mercury vaporize
  • A high voltage is applied between 2 electrodes
  • Current flows in the tube, controlled by the ballast
  • Exited Hg ions emmit UV light
  • Phosphor coating convert UV to visible light
fluorescent lamp application diagram

AT90PWM2

DALI I/F

DALI

SPI

A/D

ISP

PSC0

PSC2

PSCOUT00

PSCOUT20

PSCOUT21

+5V

+15V

Driver + Supply

Driver

Lamp+

resonator

PFC : BOOST CONVERTER

LAMP DRIVER

Fluorescent lamp application diagram
hid lamp basics
HID lamp basics

HID lamps have internal arc tube and an outer envelope

  • Tube is filled by high pressure gas
    • Mercury vapor
    • Metal Halide
    • Sodium
  • Distance between electrodes is some mm
  • High voltage required for start-up (2 to 30 kV)
  • Current and voltage (100-400V) is controlled by the ballast
  • Arc between electrodes emmit light
  • Most HID lamps require warm-up period for full intensity and a cool-down period before re-strike
hid application diagram

AT90PWM3

DALI I/F

DALI

SPI

A/D

ISP

PSC0

PSC1

PSC2

PSCOUT20

PSCOUT00

PSCOUT23

PSCOUT10

D/A

PSCOUT21

PSCOUT22

+5V

+15V

+15V

Driver + Supply

Driver

Driver

Driver

Lamp+

resonator

PFC : BOOST CONVERTER

BUCK CONVERTER

LAMP DRIVER

HID application diagram
at90pwmx competitive advantages 1
AT90PWMx Competitive advantages (1)
  • All advantages of Mega48/88 plus
  • PSC
    • Advanced 12 bits, dual channels, PWM generators
    • Two control inputs (one digital, one analog comparator) for retriggering and overcurrent handling
    • PLL Clock up to 64 MHz
    • Variable frequency and pulse width
    • Enhanced resolution mode (16 bits flank modulation)
    • Input capture register
    • Large number of modes for Lighting, Motor Control, DC/DC conversion
    • Can synchronize the ADC
  • DALI (Digitally Adressable Lighting Interface) communication
    • 16 & 17 bits frames
    • Manchester coding
    • Autobaud
at90pwmx psc module
AT90PWMx PSC Module

PSC 4 ramp mode exemple

PSC Block Diagram

digital Sync Input

Analog Sync Input

PSC Edge retrigger mode exemple

at90pwmx competitive advantages 2
AT90PWMx Competitive advantages (2)
  • A/D
    • 10 bits, 11 channels, speed 8 µs min
    • Improved 2.56V Reference voltage
  • Amplifier (One or Two) for A/D
    • 250 kHz Synchronous BW, switched capacitor amplifier,
    • Low offset (5mV at the output)
    • Programmable gain 5, 10, 20, 40
  • D/A
    • 10 bits, with output driver (impedance < 1KOhm)
    • Driver speed, 1 µs on 1 nF load
  • A/D, Amplifier & D/A can be synchronized with Timers & PSC
  • Comparator
    • Fast clocked comparator (16 MHz)
    • Offset 5 mV (at the input)
    • Programmable comparison voltage (4 fixed levels, external, D/A)
    • Generates interrupt or updates PSC
pwm2 3b changes
PWM2/3B Changes
  • Comparator
    • Clock frequency can be up to 16 Mhz (8 Mhz at 3.3V)
    • Analog hysteresis added (+50 – 100mV)
  • Amplifier : new logic for ADC start leading to shorter amplified conversion time
  • ADC speed : sampling and accuracy at 1 Mhz fixed (Still degradation at 2Mhz)
  • DAC glitches corrected, DAC amplifier linearity corrected
  • PSC
    • All erratas corrected
    • Inverted output in centered mode
    • Software input capture (write in register trigger an input capture)
    • Activity output flags added
    • Prescaler modified (larger division factor possible)
  • DALI
    • Reception of manufacturer frames (17 bits) with stop bit coded on different ways (0, 1, level, Manchester)
    • Errata corrected
  • PLL can also take its source from XTAL oscillator

NOTICE : Changes with  may not be upward compatible (to be checked case by case)

at8xeb5114 advantages
AT8xEB5114 Advantages
  • Optimized for fluorescent tube Ballast controller
  • Present system
    • ASIC : one board per tube
    • Tube caracteristics adjustment done by passive components
  • AT8xEB5114 system
    • Microcontroller control : one board for all tubes
    • Tube caracteristics adjustment done by software
    • Low power consumption for start up procedure
  • Analog
    • 10-bit, 6 channels A/D converter
    • Amplifier/rectifier
    • Two Flexible 16 bits PWM: PFC and lamp control
    • RC oscillators to control power consumption during start up
  • Flash and ROM versions
  • Stacked EEPROM
tools support
Tools/Support
  • STK520 Starter Kit extension
  • DebugWire emulator
  • STK520
  • AT89EB5114 Emulator
  • AT90PWM : Dimming Fluorescent Ballast Demo Kit
  • AT89EB5114 : Fluorescent Ballast Demo Kit
  • AT90PWM : HID & LED Ballast Demo Kits in development
atavrfbkit at90pwm fluo demo kit
ATAVRFBKIT : AT90PWM Fluo Demo Kit
  • Specifications
      • 400 volt DC bus by a power factor correcting boost regulator (PFC)
      • 100% to 2% dimming.
      • Two lamps T8 18W
      • 90 to 265 VAC 50 or 60 Hz
    • Controls:
      • DALI power control
      • 0-10 volt power control
      • One touch “Swiss” dimming
  • Partlist
    • Atmel
      • AT90PWM2
    • IXYS
      • IXI858/859 - Driver/Reference/Interface IC
      • IXTP3N50P - TO-220, 500V/3A MOSFET
      • IXTP02N50D – Depletion mode FET for startup voltage
      • IXH611S1 - 650V/600mA Half-Bridge Gate Driver
      • LDA111S - Clare Optocoupler