Electronic energy-saving lamp circuit 3

Figure 289 illustrates the VK05CIl, an ASIC produced by STMicroelectronics (ST) designed to operate low-power compact fluorescent lamps ranging from 5 to 15W. The VK05CFI is engineered to drive approximately 23W low-power compact fluorescent lamps using high-pressure composite bipolar transistors and integrated low-voltage switching devices. The device operates with a maximum frequency of 200kHz and can handle high voltages up to 520V with a rated collector current of 250mA. It comes in an 8-pin package, with the collector being an NPN transistor and the emitter connected to a low-voltage power source. The circuit includes a bridge rectifier, filtering components, and a half-bridge inverter circuit with a series resonant configuration. The system is designed to ignite the lamp quickly and maintain steady operation.

The VK05CFI ASIC is specifically tailored for driving low-power compact fluorescent lamps, showcasing a robust design that integrates multiple electronic components for efficient operation. The device employs high-pressure composite bipolar transistors, which enhance the performance and reliability of the circuit. The maximum operating frequency of 200kHz allows for rapid switching, which is critical for the efficient operation of fluorescent lamps.

The circuit design includes an 8-pin package configuration, where one pin is dedicated to the collector of the NPN transistor. This transistor plays a vital role in managing the high-voltage output necessary to ignite the fluorescent lamp. The integrated low-voltage switching devices facilitate the control of power delivery to the lamp, ensuring optimal performance.

A bridge rectifier circuit composed of diodes VD1 to VD4 is implemented to convert the alternating current (AC) input to direct current (DC), which is essential for the operation of the inverter circuit. The filtering components (capacitors and inductors) smooth out the rectified output, reducing voltage ripple and providing a stable DC supply to the inverter.

The half-bridge inverter circuit is designed to generate the high-frequency pulses required to drive the lamp. A series resonant circuit is utilized to enhance the ignition process of the lamp. Initially, a small resistance (RT) is used to limit the current during startup, allowing the lamp to warm up gradually. After a brief period, as the temperature of RT rises, it transitions to a high impedance state, enabling the full current to flow through the lamp, thus ensuring proper ignition and operation.

The transformer (T) used in the circuit features a ferrite core with approximately 200 turns of high-strength polyester enameled wire, optimized for the application's power requirements. The core's gap is carefully designed to enhance the magnetic coupling and efficiency of the transformer.

Overall, the VK05CFI ASIC represents a sophisticated solution for driving low-power compact fluorescent lamps, combining advanced semiconductor technology with efficient circuit design to achieve reliable and effective lamp operation.Figure 289 Star STMicroelectronics (ST) deputy public cattle produced VK05CIl. ASIC production of electronic front desk lamp can be lit 5-15W low-power compact fluorescent lamp s ([FL). VK05cFI. Is designed to drive o ~ 23W low-power compact fluorescent lamps designed for high-pressure composite bipolar transistors and integrated low-voltage switching devices outside IOSFF.T combination, the maximum operating frequency of 200kHz, the power device and the source collector Xi Xi borers between high voltage 520V, rated collector current of 250mA. It is an 8- foot s () package, the first, ,, feet collector NPN transistor, high-pressure composite, O feet for low voltage power M (JSFFT source, namely high pressure composite transistor emitter in the device there is also integrated two-way contact hair shake tube DJA (1 other components.

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RT-frequency current through the lamp to warm up after about 07- 1 2S, RT temperature was raised to the Curie point, immediately showed a high impedance blocking exhausted stream unravel G. the current through (1, cause/and G, and other series circuit of a resonance in C, 1, G., seven high-voltage pulse so that the lamp F fast starter, lamp working properly called, I.

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