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Adaptive ballast control IC

A ballast and power control technology, applied in the field of adaptive ballast control IC, can solve problems such as performance deterioration, base excitation limitation, failure, etc., and achieve increased or decreased scale, high noise immunity, and fewer components. Effect

Inactive Publication Date: 2005-10-12
INTERNATIONAL RECTIFIER COEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] ● Base excitation limitation at higher power
[0014] These defects can lead to out of tolerance components and loads and / or catastrophic failure of the ballast output stage components, which can lead to poor performance, poor quality, and / or field failure

Method used

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Examples

Experimental program
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Embodiment Construction

[0046] A simple, low-cost IC solution has been developed that combines multiple CFL functions, plus high-side and low-side half-bridge drivers (Figure 1). In order to reduce the packaging cost, IC has been limited to 8 pins, so it is suitable for standard SO8 package or DIP8 package. The half-bridge driver requires four pins 8, 7, 6 and 5 (VB, HO, VS and LO), and two pins 1 and 2 (VCC and COM) are required for power supply and loop, and one pin 4 is used for programming minimum Frequency (FMIN).

[0047]This results in only one control pin 3 available for the ballast function. In order to achieve this goal, the voltage-controlled oscillator analog input pin (VCO) is used in combination with internal adaptive control systems and methods and half-bridge voltage sensing technology to achieve warm-up, ignition, operation, and fault protection functions.

[0048] Figure 1 shows a block diagram of the IC, and Figure 2 is a table of pin assignments for the IC. 1 and 2, the IC 100 has an ...

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PUM

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Abstract

An integrated circuit (100) for controlling a power supply circuit which delivers power to a load circuit that includes a fluorescent lamp (33), comprising ballast control and drive circuitry that provides drive signals to the power supply circuit, receives sense signals indicating operating conditions of at least one of the power supply circuit and the load circuit, and responds to the sense signals by modifying the drive signals; and including adaptive zero-voltage-switching and minimum-current-switching (ZVMCS) circuitry, wherein the ZVMCS circuitry senses an output of the power supply circuit, and in response thereto, controls the drive circuitry to maintain the power supply circuit under ZVMCS conditions. The power supply circuit includes a half-bridge circuit with low and high side power devices, the drive signals including low side drive signals to control the low side power device and high side drive signals to control the high side power device; the ballast control and drive circuitry including a low side drive output for providing the low side drive signals to the low side power device and a high side drive output for providing the high side drive signals to the high side power device. The ZVMCS circuit senses an output voltage and / or current at the half-bridge circuit between said high side and low side power devices at a switching time of one of the power devices, and controls the drive signals so as to maintain the output voltage and / or current near or at zero at said switching time.

Description

[0001] Cross-references to related applications [0002] This application is based on the U.S. provisional applications US 60 / 395,093 and US 60 / 395,473 (IR-1809 PROV and IR-1809 PROV II, respectively) filed on July 9, 2002 and July 10, 2002, and requires them. For priority, the disclosed content is incorporated herein by reference. [0003] This article relates to the U.S. Provisional Application 60 / ___ (Agent No. IR-2199 PROV) filed on June 24, 2002, and this application is also incorporated herein by reference. Background technique [0004] Many linear electronic ballasts for fluorescent lighting applications currently on the market include standard ballast control ICs, ASICs or microcontrollers. These control ICs perform a variety of functions from power factor correction to lamp / ballast control, and have helped to meet the technical needs of new types of lamps while reducing the number of parts and costs. In self-ballasted compact fluorescent lamps (CFL), self-oscillating bipol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/24H05B41/282H05B41/285
CPCH05B41/2856H05B41/2853H05B41/2828Y02B20/186Y02B20/00
Inventor T·J·里巴里希
Owner INTERNATIONAL RECTIFIER COEP