Control technology for new energy-saving lighting power supplies
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.
It should be said that the main application areas of lighting control ICs are: industrial buildings and office straight pipes and compact fluorescent lighting; residential and hotels with compact fluorescent lights CFL and cold cathode fluorescent lamps CCFL; halogen lamps in retail lighting equipment market And HID of outdoor lighting; single white light LED and camera flash; OLED and TFT displays, etc.
New Building 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.
High pressure isolation novel IC technology suitable for electronic ballast
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.
This high-pressure isolation IC technology allows circuitry to be placed inside isolated, this "well" to low voltage circuits can have 600V isolation.
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Figure 1 Schematic diagram of high pressure isolation knot IC technology
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.
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.
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 on the IR2153, which integrates additional functions to IR2153, which is more complete and controlling 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.
Intelligent power technology fluorescent lamp drive circuit
This is a solution to a wire-driven linear fluorescent lamp tube using a fixed frequency (up to 200kHz) half bridge topology. 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.
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).
Figure 2 is a driver for a fluorescent lamps using a VK06TL drive circuit, a half bridge converter design.
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Figure 2 Application of a fluorescent lamp ballast for VK06TL drive circuits
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.
The control level and power level of the chip are powered by the VCC pin, and the VCC pin is connected to the DC bus through an resistor capacitor 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.
IC IR2520D and CCFL of CFL TPS68000
IR2520D
Another major part of the lighting control IC, including compact fluorescent (CFL) and cold cathode fluorescent tubes (CCFL). Traditional control of this lamp is self-oscillation type and is very sensitive to cost. Due to reliability issues, the self-oscillation scheme actually hinders rapid development.
Because HVJI technology is mainly used to isolate high voltage circuits and level conversion gate drive signal circuits. Using IR2520D, HVJI function is expanded to achieve the necessary detection function. The previous IC requires a separate pin for some species such as DC bus undervoltage, overcurrent, filament opening or lamp removal. The IR2520D uses HVJI technology and new control algorithms to detect all required parameters through a single pin. However, this pin is in the middle of the half bridge that is frequently exchanged between the COM side and the high voltage DC bus, which means that the test must be completed when the low-end half bridge switch is turned on, and when the high-end switching of the half bridge The circuit must be able to withstand high pressure, IR2520D uses the third internal high voltage MOSFET to achieve this function. IR2520D uses new control algorithms such as "non-zero voltage switch (ZVS) protection" and "peak detection" to implement the necessary ballast function, other control pins are used to set the minimum operating frequency and preheating time. Finally, add the frequency vibration function, which typically transfers the frequency to a few kilometers and falls to the smallest frequency, thereby reducing the need to reduce the external EMI filtering. Integrating all these features in a simple 8-pin package, the design goal of IR2520D is applied to CFL products. This new solution will reduce the cost of size and CFL ballasts, improve manufacturing capabilities, and improve reliability to help CFL products and further development of this market share. Figure 3 is a schematic diagram of the IR2520D to CFL.
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Figure 3 Schematic diagram of IR2520D IC in compact fluorescent lamp (CFL)
CCFL backlight controller
The CCFL control characteristics use TPS68000 high-efficient phase-sensing full bridge CCFL controller.
The main features of the TPS68000: the input voltage range is 8V to 30V; all-bridge technology integrated, for 4-NMOS conversion;
Synchronous constant operating frequency; programmable phase delay is used to control the operating frequency from the operation; light-voltage regulation, light-current steady flow; simulated dimming and pulse dimming; multi-control device adjustable dispensers under multi-control devices ; Start-up or error states, long; open light protection and short circuit protection; built-in high temperature protection and low voltage lock mode. The TPS68000 high-efficiency phase shift full bridge CCFL controller application circuit is shown in Figure 4.
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Figure 4 is a schematic diagram of the TPS68000 applied to CCFL
Halogen lamp converter IC
The halogen lamps in the market are undergoing reliability challenges. Electronic transformers are often damaged due to overload and short circuit failures. However, with suitable techniques, the halogen transfer converter IC can be a solution, that is, a three-way two-way controllable silicon switching element can use a gentle and continuous dimming of the halogen tube. The challenge facing IR2161 is to provide a wide range of protective features, tube voltage regulation and dimming function in a small 8-pin package (Figure 5).
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Figure 5 Application IR2161 in the halogen lamp block diagram
IR2161 halogen lamp solution is a simple, excellent design, reduces total components, and provides higher performance. IC + MOSFET combined solutions will greatly improve the manufacturing capabilities and reliability of these products, but also help this market further development.
Conclusion
With the development of new lighting technology or prior art derived, such as fluorescent tubes and even LEDs in diameter, they will create their own new markets with their related applications, and the result is to further promote electronic energy-saving lighting products. Benefit the entire market. Technology area
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