Press Releases

New AC-DC Open Frame Type Power Supplies with Peak Power Capability

April 26, 2012

TDK Corporation (President: Takehiro Kamigama, Head Office: Nihonbashi, Chuoku, Tokyo) announces the new TDK-Lambda "ZWS-BP series” open frame type AC-DC power supplies with peak power capability featuring compact size, lightweight and high efficiency. TDK-Lambda Corporation (President: Yoshiaki Hirota, Head Office: Nihonbashi, Chuoku, Tokyo) start to accept orders for the 150W and 240W models from April 26, 2012.

■ Development Background and Concept

Toward realization of low carbon society, the market need is increasing for smaller size, lighter weight and higher efficiency power supplies with less power consumption at lower output power and no load condition. In response to such market need, TDK has developed compact size, lightweight and high efficiency open frame type AC-DC power supplies with peak power capability. The new “ZWS-BP series” features improved efficiency (5% or more at full load condition) and reduced size (30% or more in size and weight) as compared with existing models.

■ Product Positioning

The “ZWS-BP series” are developed as successor model for existing “ZWS-PAF series“ with 200% peak power capability, efficiency improvement of 5% at full load condition and a reduction of 80% or more power consumption in standby mode (*). In addition, to the above features, they offer a wide operating ambient temperature range that ensures safe operation under severe operating conditions, excellent output de-rating, smaller size and lighter weight of up to 30% or more compared to existing models. Thus, they can make customers' products smaller and help development of energy saving products. With the addition of the “ZWS-BP series” to the existing lineup of the “ZWS-B series” featuring a wide range input and the “ZWS-BAF series” with power factor and harmonic correction, the “ZWS series” has become a fully-fledged product family with highly advanced specifications.

  • (*) In case of ZWS240BP

■ Main features

  • 200% peak power capability
  • Compact size, lightweight and high efficiency
        Efficiency improvement of 5% or more at full load condition (*1)
        Reduction of 30% or more in size and weight (*1)
  • Significant reduction of power consumption in standby mode (*2)
  • Wide operating temperature range (between -10ºC and +70ºC)
  • (*1) As compared with conventional models
  • (*2) In case of optional model with remote on/off control

■ Major applications

Test & Measurement, Office automation, Automated machines for industrial and commercial use, that need power supplies with peak power capability

Profile of "ZWS-BP series"

Series name “ZWS-BP series” (PC Board type AC-DC power supply)
  • 200% peak power capability
  • Efficiency improvement of 5% or more under all load conditions (*1)
        Contributes to energy saving of equipment through reduction of energy losses
  • Significant reduction (30% or more) in size and weight (*1)
        Size: reduced by 33%
        Weight: reduced by 31%
  • Significant reduction in standby mode power consumption (*2)
        100V input: 0.15W typical
        200V input: 0.5W typical
  • Operating temperature range of -10ºC ~ +70ºC is guaranteed for all models (*3)
  • All models come with a 5-year-warranty (*4)
  • (*1) As compared with conventional models
  • (*2) In case of optional model with remote on/off control
  • (*3) Under standard installation conditions
  • (*4) With conditions

■ Summary of specifications

Product names: ZWS150BP and ZWS240BP

Product lineup:

Rated output power 150W 240W
Peak output power 300W 480W
Input voltage
(single phase)
85-265VAC / 120-370VDC
Harmonic current correction PFHC embedded (IEC61000-3-2 compliant)
Output voltage 24/36/48V
(at 100V/200V)
87% / 90% 88% / 91%
Operating ambient temperature -10ºC ~ +70ºC
(-10ºC ~ +50ºC 100% @ full load))
Leakage current 0.5mA or less
Conducted & Radiated EMI EN55011/EN55022-B, FCC-B, VCCI-B
Safety Standards UL, CSA, EN
Size (mm) 75 × 37 × 160 84 × 42 × 180
PCB type/material Double sided/FR-4
Warranty period 5 years (with conditions)

Order taking will commence on April 26, 2012

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About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's current product line includes passive components, magnetic application products as well as energy devices, flash memory application devices, and others. TDK today focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2011, TDK posted total sales of USD 10.6 billion and employed about 88,000 people worldwide.

About TDK-Lambda

TDK-Lambda, a member company of the TDK group, markets a wide range of high reliability power supplies on a worldwide basis as a leading company in the market of power supplies for industrial equipment. It has a global network of 5 R & D centers (Japan, China, Europe, USA and Asia) and offers a complete set of services from R & D and production through sales and maintenance to meet diversified customer needs. For more details, please pay a visit to

■ Glossary

  • Power supply with peak power capability
    This type of power supply can deliver output power in excess of the rated maximum value for a specific time period. The ZWS-BP can deliver up to twice the rated output power.
  • Output derating
    Derating is the technique employed in power electronic devices wherein the devices are operated at less than their rated maximum power to avoid degradation of reliability of devices or components used. In the case of power supply, it means using the unit at lower than the rated output power level when the ambient temperature is significantly higher than normal temperature.

Product Information

Product information on this web site is intended only for the Japanese market.

For other markets, please access the respective regional web site or contact your nearest sales office.

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