Power Integrations Enables No-Neutral Wireless Wall Switches for Smart-Home Lighting

20-Oct-2017 Intellasia | BusinessWire | 4:00 AM Print This Post

Reference design for two-wire smart wall switch is compatible with
retrofit wiring and LED lights

SAN JOSE, Calif.–(BUSINESS WIRE)–#BluetoothLE–Power Integrations (Nasdaq: POWI),
the leader in high-efficiency, high-reliability LED-driver ICs, today
announced a new reference design, DER-622,
describing a smart wall switch compatible with wiring conditions most
commonly found in residential retrofit installations.


Typically, smart wall switches with wireless connectivity,
occupancy/vacancy sensing and/or voice control require a neutral return
wire to power the unit, which is not always available in retrofit
situations. No-neutral products are available for legacy incandescent
bulbs because the small AC input current that is allowed to leak through
the load when the smart-switch is in standby mode is insufficient to
heat the filament. However, for LED and compact fluorescent designs,
high standby-mode current from the smart-switch’s internal power supply
can lead to unacceptable flicker often known as “ghosting,” caused by
the leakage energy accumulating in the lamp and initiating intermittent
start-up and brief light activation.

DER-622
illustrates a Bluetooth® Low Energy (LE) wall switch consuming less than
500 µA in standby mode. The design is based on Power Integrations’ LinkSwitch™-TN2
offline switcher ICs, which have quiescent consumption of less than 75
µA. The ICs’ ultra-low current consumption and high light-load
efficiency ensure compatibility with energy-efficient LED bulbs rated
down to 3 W and are ideal for no-neutral wall switch wiring.

LinkSwitch-TN2 devices may be configured to support flyback or buck
topologies and deliver highly accurate output, providing voltage
regulation of better than ±3%. The ICs enhance system reliability by
incorporating numerous safety features including input and output
over-voltage protection, over-temperature, and output short-circuit
protection along with a rugged 725 V power MOSFET. In DER-622,
the LinkSwitch-TN2 power supply IC is utilized in a non-isolated flyback
topology and employs half-wave AC input rectification to reduce solution
cost. The power supply provides two outputs – a 12 V rail to drive a
relay and a 3.8 V rail to power a Bluetooth LE controller.

Comments Hubie Notohamiprodjo, director of product marketing for LED
lighting at Power Integrations: “Lighting control products such as smart
wall switches and occupancy sensors play an important role in improving
energy efficiency in homes and buildings. Many homes have wiring that is
incompatible with available products or require rewiring, which
increases cost and discourages product adoption. The simplicity of
LinkSwitch-TN2 and its ultra-low current draw enable this elegant
line-only smart-switch solution which is compatible with low-power LED
bulbs and no-neutral wiring.”

Key applications include wireless lighting control, occupancy and
vacancy sensors, motion detectors, wall dimmers and shading controls.
DER-622 can be freely-downloaded at http://www.power.com/der-622.

About Power Integrations

Power
Integrations, Inc.
is a leading innovator in semiconductor
technologies for high-voltage power conversion. The company’s products
are key building blocks in the clean-power ecosystem, enabling the
generation of renewable energy as well as the efficient transmission and
consumption of power in applications ranging from milliwatts to
megawatts. For more information please visit www.power.com.

Power Integrations, LinkSwitch and the Power Integrations logo are
trademarks or registered trademarks of Power Integrations, Inc. All
other trademarks are the property of their respective owners.

Contacts

Media Contact
Power Integrations, Inc.
Peter Rogerson,
408-414-8573
[email protected]
or
Press
Agency Contact

BWW Communications
Nick Foot, +44 (0)
1491-636 393
[email protected]

 


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