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How we devised a wirelessly powered television set

How we devised a wirelessly powered television set

Televisions can get their content wirelessly, but there is one set of wires they still need: those in their power cord. The consumer electronics industry has floated ideas for freeing TVs from their power cords, but this goal remains elusive. There are several reasons, such as the difficultly of meeting high-power requirements for large-screen TVs and the need for identifying an economical technology. Nevertheless, eGaN FETs could play a role in making TVs truly cordless devices.

Power Electronic Tips
February, 23, 2017
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Categories: Articles

15 MHz Half-Bridge Development Boards Use EPC's eGaN FETs and High Frequency Synchronous Bootstrap Topology

15 MHz Half-Bridge Development Boards Use EPC's eGaN FETs and High Frequency Synchronous Bootstrap Topology

EPC’s new development boards can be configured as either a buck converter or a ZVS class-D amplifier, demonstrating reduced losses at high frequency using an eGaN FET synchronous bootstrap augmented gate drive.

EL SEGUNDO, Calif.— March 2016 — Efficient Power Conversion Corporation (EPC) Introduces the EPC9066, EPC9067, and EPC9068 development boards, which are configurable to a buck converter or as a ZVS class-D amplifier. These boards provide an easy-to-use way for power systems designers to evaluate the exceptional performance of gallium nitride transistors, enabling the designers to get their products into volume production quickly. All three boards feature a zero reverse recovery (QRR) synchronous bootstrap rectifier augmented gate driver to increase efficiency at high frequency operation, up to 15 MHz. The boards can produce a maximum output of 2.7 A in the buck and ZVS class-D amplifier configurations. Loss reduction is realized across the entire current range.

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Categories: Press Releases

Radiated EMI Filter Design for an eGaN FET Based ZVS Class D Amplifier in 6.78MHz Wireless Power Transfer

Radiated EMI Filter Design for an eGaN FET Based ZVS Class D Amplifier in 6.78MHz Wireless Power Transfer

In this installment, we present a method to design a suitable EMI filter that can reduce unwanted frequencies to levels within radiated EMI specifications, and do this without negatively impacting the performance of the wireless power coil. In addition, the overall radiated EMI design aspects will also be covered.

EEWeb - Wireless & RF Magazine
Michael de Rooij, Ph.D.
February, 1, 2016
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Categories: Articles

Efficient Power Conversion (EPC) Introduces High Efficiency Wireless Power Transfer Demonstration System Operating at 6.78 MHz Featuring High Frequency Gallium Nitride (eGaN) FETs

The superior characteristics of eGaN® FETs, such as low output capacitance, low input capacitance, low parasitic inductances, and small size make them ideal for increasing efficiency in highly resonant, Rezence (A4WP) compliant, wireless power transfer systems.

EL SEGUNDO, Calif.—June, 2014 — Efficient Power Conversion Corporation (EPC) today announce the introduction of demonstration boards for wireless power transfer in an innovative high performance topology; Zero Voltage Switching (ZVS) Class-D. The EPC9506 and EPC9507 amplifier (source) boards utilize the high frequency switching capability of EPC gallium nitride transistors to facilitate wireless power systems with greater than 75% efficiency.

Wireless Power Transfer

The popularity of highly resonant wireless power transfer has increased over the last few years and particularly for applications targeting portable device charging. The end applications are varied and evolving quickly from mobile device charging, to life-extending medical implementations, to safety-critical hazardous environments.

The requirements of wireless energy transfer systems include high efficiency, low profile, robustness to changing operating conditions and, in some cases, light weight. These requirements translate into designs that need to be efficient and able to operate at high switching speeds without a bulky heatsink. Furthermore the design must be able to operate over a wide range of coupling and load variations. The fast switching capability of eGaN FETs is ideal for highly resonant power transfer applications.

Amplifier Demonstration Boards (EPC9506 / EPC9507)

The EPC9506 and EPC9507 are high efficiency, A4WP compliant, Zero Voltage Switching (ZVS), Voltage Mode Class-D wireless power transfer amplifier (source) boards capable of delivering up to 35 W into a DC load while operating at up to 6.78 MHz. The boards feature the 40 V EPC2014 (EPC9506) and the 100 V EPC2007 (EPC9507) eGaN FETs. Both boards are configured to operate in either a half-bridge topology (for single-ended con¬figuration) or full-bridge topology (for differential configuration), and include the gate driver(s) and oscillator that ensure operation of the boards at a fixed frequency.

Price and Availability

EPC9506 and EPC9507 demonstration boards are priced at $418.95 each and are available for immediate delivery from Digi-Key at http://digikey.com/Suppliers/us/Efficient-Power-Conversion.page?lang=en

Future: EPC’s New ZVS Class-D Wireless Power Transfer System Demonstration Kits

In addition to the stand-alone amplifier (source) boards available now, EPC will be introducing shortly a family of full system demonstration kits. The full kits include the amplifier (source) board, a Class 3 A4WP compliant sour Read more

Categories: Press Releases
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