1 Introduction
Electrical management solutions for architectural lighting, such as inductive fluorescent lamps, electron fluorescent lamps, compact fluorescent lamps (CFL), halogen lamp control integrated circuits and high pressure gas discharge lamps (H1D) technologies, etc., for a wide range of residential regions, commercial In the automotive, it reduces the electricity they need, and it is a huge step forward in energy conservation. Its adaptive control technology and high voltage semiconductor junction isolation technology in the integrated circuit are part of it and have been widely used. This is discussion on the new building energy-saving lighting control IC technology and application.
It should be said that the main application areas of lighting control ICs are: industrial buildings and industrial buildings and compact fluorescent lighting; residential and hotels with compact fluorescent lighting equipment CFL and cold cathode fluorescent lamps CCFL; halogen lamps in retail lighting equipment market HID of outdoor lighting; single white light LED and camera flash; OLED and TFT displays, etc.
2 characteristics of new construction lighting control IC technology
Currently, there are two different typical methods in lighting control ICs (ie, electronic converters). The first method is based on the IC device, which drives two high pressure (usually above 400 V) power MOS transistors together with several external passive devices, and implements a half bridge converter; the second method is based on two high-pressure bipolar transistors and A large number of passive devices, but only partial functions can be implemented. Bipolar solutions are used in low-end low-end applications with extremely low cost.
2.1 High-pressure isolation novel IC technology suitable for electronic ballasts
These control ICs have driven two requirements for high pressure isolation techniques to meet the cost and reliability of energy-saving products. The control IC-high pressure isolation technology is now applied to the ballast to produce products with competitive, high performance and highly reliable. The challenge now is to extend them to other lighting markets by controlling the new IC of the light source.
2.1.1 Characteristics of high voltage isolation knot IC technology
This high-pressure isolation IC technology allows circuitry to be placed inside isolated "well", this "well" to the low voltage circuit can have 600V isolation, see Figure 1 shows the yellow thick line. This is because many lighting techniques are coupled together with high voltage power MOSFET technology, and their separation product line includes a large number of different models, ranging from bridge rectifiers and Schottky diode to power MOSFET and IGBT.
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Figure 1 Schematic diagram of high pressure isolation knot IC (as shown in the gray thick line)
The high-voltage isolation novel IC technology is characterized by fusioning the high-end and low-end driving functions within a single chip to control the topology of a plurality of switching converters. One of these topologies is a half-bridge structure widely used in electronic ballasts. This makes this technology very suitable for the electronic ballast industry.
2.1.2 IR2153 and IR2166 control IC of fluorescent lamp lighting
* IC IR2153 combines standard 555 time-based circuits with high-end and low-end half bridge drivers. This IC is used together with high pressure MOSFET, which is quickly used in lighting technology, and has become a standard controller for electronic ballasts, which can be used as the basis for the development of IC development in future lighting. Since IR2153 is widely used and improved to become IRS2153D, the top is more solid and integrated, and the necessary bootstrap diode is integrated.
* IR2156 and IR2166 Control ICs are improved ballast technologies based on IR2153, which integrates additional functions to IR2153, which is a more complete control of fluorescent lamps. They include maximizing the life of the lamp and the preheating and fault protection function necessary to improve the reliability of the ballast. IR2166 further improves and integrates active power factor correction (PFC) control, with a single-chip solution for the entire ballast together with ballast control. Because the power level is 25W above 25W, the PFC is forcibly in Europe, and the other places in the world are following the same trend.
IR2166 includes two separate oscillators in the same IC, one for controlling the ballast input and the other for controlling lights. Further, in order to meet the new requirements of the T5 fluorescent lamp, IR2166 is provided with a life-end final (EOL) pin to detect overvoltage that occurs when the lamp is close to the end of the life, and the ballast is safely closed before these high voltage damage.
2.2 Fluorescent lamp drive circuit technology for intelligent power technology
It is a solution to a wire-driven linear fluorescent lamp tube using a fixed frequency (up to 200kHz left and right). The program uses a system chip: integrated control part, protective circuitry and power levels on the same chip VK06T. Since this single-chip circuit is used, the system reliability has improved, in addition, system integration and small packages have also achieved smaller.
2.2.1 Technical Characteristics
VK06TL drive circuit chip applies intelligent power VIPovver M3-3 manufacturing techniques, allowing integrated control parts and power levels on the same chip VK06TL. The power level is a "emitter switch" that is made by placing a bipolar high-pressure Dalipon transistor and a low pressure MOS field effect transistor by placing a bipolar high-voltage Dalipon transistor and a low pressure MOS field effect transistor. Therefore, this scheme implements the balance between the low pressure drop between the bipolar devices and the high breakdown voltage, and the MOS field effect transistor is fast. Therefore, this "emitter switch" structure can achieve a high frequency (about 200kHz).
2.2.2 VK06TL chip applied to fluorescent ballast drivers
Figure 2 is a driver for a fluorescent lamp induced by a VK06TL drive circuit, a half bridge converter design.
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Figure 2 Apply a fluorescent ballast device for VK06TL drive circuits, ie half bridge converter design
In the half bridge converter of Figure 2, VK06TL is specified for the upper bridge arm and the lower bridge arm. Because two VK06TLs are used, there is almost no external devices, only two secondary windings can be turned on. Therefore, the driver-half bridge converter dedicated to the fluorescent lamp caucaper is a highly efficient and low cost fluorescent converter.
This converter can properly manage a high-end fluorescent lamp application all necessary working conditions, namely start, preheating frequency, and time-control, ignition, and steady state. This half-bridge can achieve overcurrent protection (EOL: tube life), rectifier effect protection and over temperature protection, thereby creating a full protection system.
Both the chip control level and power level are powered by VCC pin, and the VCC pin is connected to the DC bus via an resistor capacitor (RC) network. In the start-up phase, the capacitor is charged through a high-resistance resistor, so there is only a few hundred microamines. Since the power bipolar crystal storage base current is recovered on a capacitance connected to the VCC pin through the VCC Charging Network, the device is powering itself on the working phase. VK06TL This special feature allows a smaller power consumption, and the upper bridge arm power supply does not require a charging pump. You must also trigger from the SEC pin connected to the secondary winding.
It should be noted that this single-chip method does not require external resistors and connectors to achieve power-level current detection. Further, as described above, only one single piece of device can integrate a temperature protection circuit.
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