Low cost and high performance RED2102 high power energy saving lamp

Although the development of LED lighting is extremely rapid this year, due to the cost and technology of LED solutions, energy-saving lamps cannot be completely replaced at present. In particular, it still takes time to replace high-power energy-saving lamps. Therefore, it is still necessary to research and develop low-cost and high-performance high-power energy-saving lamps.

The development of high-power energy-saving lamps is currently facing the following problems:

1. Reliability: When the input voltage fluctuates, in addition to the APFC (Active Power Factor Correction) circuit, the general energy-saving lamp has no power control function. Since the heat generation and component load of the high-power energy-saving lamp are originally large, when the power is increased, the lamp will be ineffective due to overwhelming. In fact, the grid voltage will fluctuate, and the output voltage of the generator and inverter will be more unstable. Therefore, if the power of the energy-saving lamp is controlled below the safe value, the reliability of the lamp will be greatly improved.

2. High performance: energy-saving lamps larger than 25W, according to the requirements of IEC 61000-3-2/GB 17625.1, the third harmonic is lower than 30λ, and the fifth harmonic is lower than 10%. At present, high power factor ballasts are not costly or have problems with reliability and longevity. In addition, the number of switches is also an important indicator of energy-saving lamps.

3. High luminous efficiency: In addition to the influence of the lamp, the luminous efficiency depends on the working efficiency of the electronic ballast. Ballast efficiency is limited by the matching of the lamp, so the development of efficient and reliable ballasts also faces many difficulties.

4. Low cost: In the face of fierce market competition, there is no market prospect for design without cost advantage. For example, APFC circuits with excellent performance are currently only used in some high-end energy-saving lamps because of their high cost.

Today's semiconductor industry is quite developed, and a control IC may be cheaper than our commonly used IRF830 MOSFET. So, is there a solution that uses only one IC and a small number of peripheral circuits to solve the problem of controlled lamp power and low current harmonics?

2. Performance and cost of RED2102 energy-saving lamps

RED2102 is a special IC for energy-saving lamps developed by REDSEM in Hong Kong using its proprietary CSOC (Controlled Self Oscillating Converter controlled proprietary self-oscillation converter) technology. It drives low-cost bipolar transistors in half-bridge LC series ballasts commonly used in energy-saving lamps. Not only is the cost low, but also the function of output power control and input harmonic correction is realized, so that the energy-saving lamp has a very high cost performance.

Features of RED2102:

l Long life, more than 10,000 hours

l Low cost bipolar transistor CFL circuit

l Controllable warm-up starting current

l can control the slope of the ignition voltage

l When the power supply voltage rises, the lamp power is automatically limited.

l Capability mode detection

l Automatic dead time control

l Small number of peripheral components and low cost

l IC power consumption is very low, small package

1. How RED2102 works

RED2102 works by driving a transistor base through a simple magnetic loop transformer to turn on the transistor, and uses the energy conversion of the half-bridge LC series circuit and the synthesis of the IC output control signal to force the transistor switch to turn off to control the ballast. The working frequency is shown in Figure 1.

Figure 1 How CSOC technology works

CSOC technology does not encounter problems associated with many MOSFET ballasts. Dead time and capacitive mode are automatically controlled by RED2102. CSOC drive technology allows the use of smaller bipolar transistors at a lower cost.

Figure 2 is a circuit diagram of a 45W energy-saving lamp designed with RED2102.

In Figure 2, U1 controls the switching period and on-time of two Q1Q2 bipolar transistors in the energy-saving lamp half-bridge ballast according to the collected lamp current, and realizes the control of the lamp power through the magnetic ring T1. Therefore, the energy-saving lamp can better adapt to the fluctuation of the power supply voltage in actual use. At the same time, the input current harmonics are corrected, and the performance and reliability of the high-power energy-saving lamps are improved under the premise of low cost increase.

Figure 2 RED2102 45W energy-saving lamp circuit diagram

2. Performance and cost of RED2102 energy saving lamp

I just introduced the working principle of RED2102. The performance of the 45W energy-saving lamp combined with the design and development below shows the performance and cost of the energy-saving lamp after adopting the solution.

Figure 3 shows the working mode of each stage of the energy saving lamp, with preheating start and power control functions.

Figure 3 RED2102 working mode

l warm-up start

As can be seen from Figure 3, the circuit enters the preheat mode immediately after it starts working, after a period of time (less than

After 1s), enter the start ignition mode. Since RED2102 has the control of preheating current and ignition voltage slope and adjustment by ballast OCV (Open Circuit Voltage), the number of switching of energy-saving lamps can easily reach more than 30,000 times, meeting the fifth stage of EuP (September 1, 2013) Requirements for implementation).

l Work efficiency

RED2102 not only has its own low power consumption, but also because of the unique CSOC patent technology drive of the IC.

The dynamic bipolar transistor works, the switching loss is low after entering the normal ignition mode, and the ballast has high working efficiency.

The 45W energy-saving lamp ballast designed and developed by Hong Kong REDSEM with the application of this IC has a working efficiency of 93.5%, which ensures the light efficiency of the energy-saving lamp. The measured light efficiency of the sample 45W6500K energy-saving lamp is 75.4lm/W. It has reached the level 1 requirement of the national standard "GB 19044-2003 self-ballasted fluorescent lamp energy efficiency limit value and energy efficiency rating".

l Power control

RED2102 has power

Limit function. It uses the detected lamp current to regulate the on-time and operating frequency of the transistor. When the voltage rises, the IC automatically increases the operating frequency of the ballast after detecting the increase of the lamp current, thereby limiting the lamp power and achieving the control of the lamp power.

Figure 4 RED2102 power control function

Figure 4 shows the relationship between the power and input voltage of a conventional half-bridge LC series circuit and RED2102 circuit energy-saving lamp. From this, we can see:

1) The 45W energy-saving lamp of the usual half-bridge LC series ballast, the lamp power is proportional to the power supply voltage.

2) RED2102's 45W energy-saving lamp starts from AC230V, the lamp power is limited to 43.5W, the AC220V~270V power variation is less than 2%, and the AC220V~300V power variation is less than 5%.

(At AC250V, the power of RED2102 is 5W higher than that of half-bridge LC; at AC270V, the power of RED2102 is 7W higher than that of half-bridge LC, and the power is 16% higher)

We know that the power control function of RED2102 not only protects the ballast components from overload shock, but also maintains the matching relationship between the lamp and the ballast and prolongs the service life of the lamp. In this way, high-power energy-saving lamps can be promoted and used in areas and places where voltage fluctuations are large.

The same reason. Without changing the reliability, the RED2102 solution enables the ballast to reduce costs by using smaller transistors and inductors because of its power control.

l Harmonic current correction

Figure 5 Harmonic current standard and measured value of the lamp

Harmonic currents greater than 25W energy-saving lamps must comply with the "IEC 61000-3-2/GB 17625.1-2003 electromagnetic

Compliant limits for harmonic current emission limits. As shown in the data in the red line box at the lower right corner of Figure 5, the 3rd harmonic of the 45W energy-saving lamp is 18.5%, the 5th harmonic is 2.5%, and the harmonics of 7th, 9th and 11th are far lower. The THD (total harmonic content) of the current is less than 19% as required by the standard.

l Cost of RED2102 energy saving lamp

We know that the usual energy-saving lamp ballasts have a lamp power that is proportional to the supply voltage. If the energy-saving lamp is to have a power control function, a common method is to use an APFC circuit, the principle of which is to connect an active power controller between the rectifier and the output capacitor. The active power controller circuit requires not only the IC for control, but also the CHOCK coil to work with the MOSFET and the fast recovery diode. As shown in Figure 6.

Figure 6 How does the boost APFC work?

In addition to the control IC in Figure 6, the CHOCK coil L and the MOSFET Q and the diode D are both power devices, and their cost is closely related to the lamp power. The higher the lamp power, the higher the cost. Therefore, it is difficult to promote the application on high-power lamps. Therefore, although the APFC circuit is widely used in fluorescent lamp ballasts, it is only used by some high-end energy-saving lamps due to cost and volume limitations.

Compared with the APFC circuit with similar performance, the RED2102 energy-saving lamp not only eliminates the CHOCK inductor and MOSFET in the expensive active power controller circuit, but also realizes the warm-up start control that the APFC does not have. There are obvious advantages in cost. Compared with the half-bridge driver IC, the RED2102 drives a bipolar transistor at a low cost. At the same time, it has the power control and current harmonic correction functions that the half-bridge driver IC does not have. At the same cost, performance outperforms.

III. Application prospects of RED2102 technology

High-power energy-saving lamps are widely used in places with high lighting requirements, such as waiting rooms, waiting rooms, conference halls, industrial and mining enterprises, shopping malls, stadiums and other indoor venues, as well as station docks, plaza ports, stadiums, stadiums and other outdoor venues. It has the irreplaceable advantages of other products. Whether it is a traditional high-pressure gas discharge lamp or an emerging LED lighting product, it is eclipsed in terms of cost performance.

In fact, the cost of a solution is very important; otherwise, it is not a problem to develop ballasts that meet the performance requirements of energy-saving lamps at today's electronic technology level. The high-power energy-saving lamps using the RED2102 solution not only effectively solve the problems encountered in the reliability, high performance, high luminous efficiency of the energy-saving lamps, but also convincingly its excellent cost control.

Because RED2102 not only has good performance, but also low cost. Therefore, RED2102 low-cost and high-performance energy-saving lamp solution with COSC patent technology has very attractive application prospects in the energy-saving lamp industry, especially in the field of high-power energy-saving lamps.


We are addressing the issues that need to be addressed in high-power energy-saving lamps, exploring how to improve their performance and reliability under low-cost conditions, and using the RED2102 solution to successfully develop a typical 45W energy-saving lamp.

Solved the actual problems encountered in the current use of energy-saving lamps.

The main performance indicators achieved by the lamp are as follows:

l The number of switching times is more than 30,000 times, and the warm-up start can be adjusted.

l The luminous efficacy of the lamp is as high as 75lm/W, and the working efficiency of the ballast is 93.5%.

l Can adapt well to fluctuations in power supply voltage (AC220V~270V power variation is less than 2%, AC220V~300V power variation is less than 5%).

l THD <19%, power factor 0.98

These properties are achieved under low cost conditions. It can be seen that the solution of RED2102 is a revolution in the design and development of energy-saving lamp ballasts.

The above is our preliminary application and summary of the RED2102 solution, hoping to bring useful help to engineers and technicians engaged in the research and development of energy-saving lamps. If there are errors and deficiencies, please correct and discuss.

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