Microcircuits for controlling electronic ballasts. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electronic ballasts. Microcircuits for controlling electronic ballasts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ballasts for fluorescent lamps

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The cheapest (Chinese-Polish) electronic ballasts work in autogenerator mode and are assembled from discrete elements. Hence the presence of several complex winding elements - transformers, large dimensions of printed circuit boards, low reliability, and complexity of settings.

Leading development companies produce a fairly wide range of ballast control chips. There are both microcircuits that require external power transistors, and modifications in which power switches are integrated into one package with a control circuit. Such ballasts are quite miniature.

More recently appeared a new generation of electronic ballast control chips, which has many service and protective functions. Unfortunately, domestic developments of electronic ballast control microcircuits are in their infancy; therefore, we have to talk only about how foreign manufacturers of power electronics have succeeded in this market.

International Rectifier (ww.irf.com) manufactures IR2156, IR2157, IR2159, IR2166, IR2167, IR2520 chips that require external power transistors, and IR5xHxx chips with integrated power switches.

STMicroelectronics (st.com) manufactures L6569, L6571, L6574 chips.

Motorola - MC2151, MPIC2151, MC33157DW.

Firm Unitrode (Texas Instilments) - UC3871, UC3872.

PHILIPS - UBA2014, UBA2021, UBA2024.

Microcircuits contain:

gate control circuit of the upper switching transistor with a voltage additive;
protection circuit against through currents (protective pause 1,2 μs);
nodes for stabilizing the internal power supply;
undervoltage protection circuit.

Additionally, new generation of chips MC33157DW, L6574, UBA2021, UBA2024, IR2157, IR2159, IR2166, IR2167, IR2520 implements:

the ability to set the heating time of the glowing electrodes;
the ability to set the ignition speed of the lamp due to the introduction of a floating driving frequency;
the ability to set a delay for turning on power switches;
additional protection against non-ignition of the lamp and the inclusion of a protective mode at the time of its failure;
protection in case of burnout of incandescent electrodes and control of the presence of an inserted lamp;
protection against ignition at a frequency below the resonant one;
protection against mains voltage drop;
automatic restart in case of short-term loss of mains voltage;
protection against overheating of the crystal.

We add that the IR2159 chip is dimmer - can adjust the brightness of the lamp (phase adjustment method).

Chips IR2166, IR2167 have a built-in power factor corrector.

Author: Koryakin-Chernyak S.L.

See other articles Section Ballasts for fluorescent lamps.

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