Development of LED lighting modules with built-in AC drive circuits capable of being driven directly by the general power supply (AC power source)
- Expansion into the module business -

March 2nd, 2011
CITIZEN ELECTRONICS CO., LTD.

Citizen Electronics Co., Ltd. (Head Office: Fujiyoshida City, Yamanashi Prefecture. President: Yoshihiro Gohta) has developed the "LMC10B series" of LED lighting modules with built-in AC drive circuits using innovative circuit technology. We will actively provide solutions such as LED modules that are needed greatly by the market, in addition to LED packages that are our core business.
Product demonstrations will be held during the "Lighting Fair 2011" (in Tokyo) from March 8, 2011.

LED lighting has been in the spotlight as LED bulbs have become common. As LEDs are usually driven by DC (direct current) power supply, when the general AC (alternating current) power supply is used, a DC drive circuit that converts AC into DC is needed. Accordingly, there are some issues for DC power driven LEDs, such as "the complexity of the circuit increases the number of components" and "electrical noise is easily generated."

AC power driven LEDs have been commercialized by other manufacturers and these types of devices can be easily downsized due to their simplified drive circuits. However, they also have an issue of "presence of zero lighting condition in minute scales reduces the efficacy" when compared with the DC power driven LEDs.

For LED lighting, there are some difficulties such as the drive system as stated above and heat dissipation. A lot of small and medium-sized companies that manufacture equipment cannot enter the LED lighting market and the demand for LED modules has increased. Therefore, Citizen Electronics has developed LED modules, which incorporate drive circuits and lenses into LED packages that are our core business.

The developed products can be driven directly by an AC power supply by adopting a new innovative technique (SCD technique *1) in LED drive circuits. Accordingly, they do not need a DC power circuit, and downsizing and slimming of the products has been accomplished. In addition, their zero lighting time has been reduced compared with that of existing AC driven LEDs and a huge increase in efficacy has also been achieved.

You can have down lights or spotlights just by incorporating heat sinks and covers into the LMC10B series. We will expand our product lineup, adding linear modules such as straight-tube fluorescent light types. By providing 'easier-to-use' LED modules, we will greatly contribute to a reduction in the time and cost of development for LED lighting equipment makers.

1. Capable of being driven directly by general power supply (AC power source)
Power-supply voltage: AC 220 to 240V [for Asian and European regions] - LED modules for Asian and European regions have been developed first due to greater demand. We will gradually release products that are compatible with AC 100V [for Japan] and AC 110 to 120V [for North America].

2. Adoption of SCD technique in LED drive circuits has achieved high efficacy
In the AC power driven circuit, a current of 100% does not always carry to LEDs. The ratio of current varies from 0 to 100% at a constant cycle as described in the table below (*2). Using a new technique in the drive circuit, the ratio of zero lighting time resulting from no current being carried to LEDs has been drastically decreased from 50% (existing level) to 25% with multi-stage controlling of the waveform of the current carried to LEDs. As a result, high efficacy has been achieved.

3. Compact and slim body
Size: DIA.90mm X H: 8.6mm
The SCD technique is suitable for downsizing the circuit due to a small number of components. In addition, the adoption of the new drive circuit technique makes it possible to drive LED modules directly by an AC power supply. Downsizing and sliming of the modules has been accomplished, as DC power circuits are not needed.

4. 4KV of dielectric strength voltage has been achieved for the first time at a module level( *3)
4KV of dielectric strength voltage, necessary for lighting equipment of 220 to 240V, has been achieved for the first time at a module level. We provide 'easier-to-use' LED modules for which high security is ensured.

5. Lineup of condensing lenses
We have a lineup of lenses (ILU-008) specialized for the LMC10B series. Please refer to our website for more information about lenses.

6. Applications
Down lights, spotlights, etc.

[Input voltage: AC 220V, Tc=60degrees Celsius]

Product code	LMC10B-23L180A-11	LMC10B-23W180A-11
Color temperature (K)	3000	4000
Total luminous flux (lm)	1000	1000
Power consumption (W)	22	22
Luminous efficacy (lm/W) [including drive circuit]	46
Power factor (%)	>90
General color rendering index Ra	80
Dielectric strength voltage (V)	4K
Rated life (hours)	40000
Size (mm)	DIA.90 X H: 8.6

• *1SCD technique: stands for Selective Current Diversion technique. This is a new technique for drive circuits developed by U.S. Once Innovations, Inc. Citizen Electronics Co., Ltd. has entered into a license agreement with Once Innovations, Inc.
• *2AC power 50Hz = 100 cycles / second, 60Hz = 120 cycles / second
• *3This is according to the results of the survey conducted by Citizen Electronics as of March 2011 when we announce the release of the LMC10B series.

"CITILED LED Module" is a brand name of LED lighting modules manufactured by CITIZEN ELECTRONICS CO., Japan.
CITILED is a registered trademark of CITIZEN ELECTRONICS CO., Japan.

North America area ---------------- Mike Lomas, +1-239-253-6363
North America area ---------------- Dave Lomas, +1-847-619-6700
Europe area -----------------------Atsuro Ijichi, +49-69-2992-4810
Asia area ------------------------- Eric Au-Yeung, +852-2793-0613
Asia area ------------------------- Dale Zhu, +86-21-6295-5510
South East Asia / India area -------Irving Wong, +65-6334-9326
Other areas ---------------------- inquiry@ce.citizen.co.jp

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