FREQUENTLY ASKED QUESTIONS

Powercast develops wireless power and RF energy harvesting solutions to provide power-over-distance for low-power applications (low microwatts and low milliwatts). Devices that typically operate on batteries for months or years can benefit from Powercast’s patented, high-efficiency RF energy harvesting technology. The cost of wiring or battery replacement can be eliminated in low-power devices through wireless, remote trickle-charging, or devices can be made completely battery-free.

GENERAL QUESTIONS

What are the intended applications for Powercast technology?

There are numerous applications that can benefit from using Powercast’s technology. The amount of received power, the use case, antenna form factor, and charge rate must be considered. Devices that operate on a set of batteries for weeks, months, or years are candidates for Powercast’s technology. Powercast is currently focused on low-power applications such as, high function RFID, battery recharging in wearable devices, and LED lighting.

Where can I buy Powercast products?

Powercast technology is designed for Original Equipment Manufacturers (OEM’s) to embed directly in their products and systems. Products can be purchased through Future Electronics, Mouser Electronics, and Arrow Electronics. If your company is an OEM and is seeking sales support, please contact us to discuss your application in more detail.

What products does Powercast offer?

Powercast offers modules and chipsets. Our modules are the P1110B & P2110B, which are for low volume applications and provide ease of implementation. Our chipsets are the PCC110 & PCC210, which are for high volume applications. Additional information about the chipsets is available after the completion of a Reference Design Confidentiality Agreement.

Does Powercast engage in custom development projects?

Yes. Powercast frequently engages in custom development projects related to RF-based wireless power and RF energy harvesting. Please contact us to provide details on your project so that we may provide a quote.

Where can I get more information about the PCC110 and PCC210 chips?

Information regarding the PCC110 and PCC210 chips is available after the completion of a Reference Design Confidentiality Agreement.

POWER QUESTIONS

How much power can be transmitted?

In the United States and Canada the maximum amount of power that can be transmitted is 4 Watts EIRP, and our TX91501 transmitter broadcasts approximately 3 Watts EIRP.

How much power is received?

The received power is determined by several factors, including distance and receiving antenna performance. Available energy after conversion in the low milliwatt and microwatt range should be expected. Please see the wireless power calculator available on our website: http://www.powercastco.com/power-calculator/

What is the efficiency of the power transmission?

Powercast’s technology enables unique applications for remote charging, and multiple devices can be charged simultaneously. The end-to-end efficiency of power transfer is not a relevant metric of comparison.

What is the efficiency of the RF to DC power conversion?

RF-to-DC conversion efficiency is as high as 70% in some scenarios. Please see the datasheets found on our website (www.powercastco.com/documentation/) for performance graphs.

What is the maximum distance that your transmitter will work?

The transmitter output power is limited by government regulation, so the receiving antenna is a primary factor in operating range. Antennas with high gain provide a better range. The directional antenna provided with the evaluation boards has a gain of 6dBi and will enable a range of 40-45 feet (12-14 meters) line of sight with the P2110B component. Our P21XXCSR-EVB Chipset Reference Design Evaluation Board has newer designs that enable greater sensitivity and range.

RADIO FREQUENCY QUESTIONS

What frequencies are supported?

The P1110B and P2110B Powerharvester receivers are designed for a center frequency of 915 MHz, but have a reasonable operating range from 850-950 MHz. The P21XXCSR-EVB supports GSM-850 uplink, Europe RFID & GSM-850 downlink, ISM USA & GSM-900 uplink, GSM-1800 uplink, GSM-1900 uplink, and Wi-Fi 2.4 GHz frequency bands. Please see the datasheets on our website (www.powercastco.com/documentation/) for performance details. The Powerharvester technology can be adapted to other frequencies and Powercast does custom development projects for frequency modification. Please contact us to discuss custom projects for frequency modification.

Can I use P1110B and P2110B components for harvesting Wi-Fi?

These components are designed with a center frequency of 915 MHz and therefore cannot be used to harvest energy from Wi-Fi routers. Although these components cannot be used to harvest Wi-Fi our P21XXCSR-EVB Chipset Reference Evaluation Board does support harvesting Wi-Fi 2.4GHz frequency.

Do you have any modules for harvesting from 2.4 GHz/Wi-Fi?

Currently, the P21XXCSR-EVB Chipset Reference Evaluation Board supports harvesting from Wi-Fi 2.4 GHz frequency. However, standard modules for harvesting 2.4GHz are not offered at this time. Please contact us about using the PCC110 & PCC210 chips for harvesting Wi-Fi.

ANTENNA QUESTIONS

What types of antennas can be used?

Powerharvester receivers are designed to work with standard 50-ohm antennas. An antenna should be matched as closely as possible to the frequency being received.

Does Powercast design custom antennas?

Powercast has antenna design expertise. Please contact us to discuss custom antenna development projects.

TRANSMITTER QUESTIONS

Can I make any adjustments to your transmitter?

There are no user controls on the existing TX91501 Powercaster transmitter. Making modifications inside of the device would be a violation of FCC and Industry Canada regulations and would also void the product warranty.

Is your transmitter required for this to work?

Powercast’s transmitter products are not required to operate the Powerharvester receivers, but some source of RF energy must be provided. Ambient energy from sources such as mobile base stations (i.e. cell sites) are typically not strong enough to operate existing Powerharvester receivers at a useful distance, but may apply in some scenarios. Harvesting from a mobile phone is typically more viable than harvesting from a mobile base station.

Can I use your transmitter in any country?

Powercast’s TX91501 transmitters are certified for use only in the United States and Canada, other countries have different frequency requirements and power limitations. Some countries allow for demonstration or experimental use without regulatory certification.

What modulations can be used to operate the Powerharvester receivers?

The Powerharvester receivers work independent of the type of modulation used (FHSS, DSSS, etc) by a transmitter, and can receive power from one or more transmitters using any type of modulations. The power of the signal is the primary metric for operation.

How does your transmitter send data?

The Powercast TX91501 transmitter broadcast data as well as power. The data is currently a transmitter ID implemented using 8 bits. Future versions may include a timing broadcast for network synchronization. The data is sent using Amplitude Shift Keying (ASK) modulations and is recovered through the Powerharvester receiver in conjunction with external circuitry and a microcontroller. The data is factory-set and not user adjustable.

Will your transmitter interfere with other RF devices (Cell Phones, Wi-Fi routers, etc.)?

All devices that generate RF frequencies have the potential to interfere with other RF devices. The interference potential is dependent on numerous factors including the field strength of the unwanted signal, the frequency band of operation, and the ability of the receiver to reject the unwanted signal. The TX91501 Powercaster Transmitter is FCC approved as FCC ID: YESTX91501 and Industry Canada(IC) approved as IC: 9895A-TX91501. The 915 MHz output power is approximately 0.5w (3W EIRP) and uses Direct Sequence Spread Spectrum (DSSS) to spread the power over more than 500 kHz as required by the FCC and IC. The Powercast DSSS signal allows devices to more easily reject the Powercast signal. Powercast has done empirical testing with mobile phones, Wi-Fi devices, and 915 MHz transceivers and found no degradation in device performance at practical separation distances.

How much power does your transmitter use?

The 3W version of the TX91501 transmitter draws about 1.5W of energy from a wall outlet, which is less energy than a typical night-light. It would take 40 transmitters to have the same total power as a single 60W light bulb.

TECHNOLOGY QUESTIONS

Is Powercast technology patented?

Yes. Powercast technology is covered by numerous patents.

Is Powercast technology safe?

Powercast technology is approved for use in the United States and Canada. Our technology is based on radio waves that are also generated by many commonly used devices, including mobile phones, cordless phones, wireless sensors, security system, etc. RF energy declines as the inverse square of the distance from the transmitter, meaning it declines rapidly. A typical mobile phone user will receive far more RF energy from their own mobile phone than they will from a properly installed Powercast transmitter.

Can Powercast transmit power through walls or other obstructions?

Yes. Radio waves pass through many types of materials, including walls. Walls and obstructions attenuate (absorb) radio waves, and this will slightly reduce the amount of energy available for reception. Radio waves reflect off of metal walls which greatly reduce or prohibit power transfer.

How does Powercast technology compare to induction-based charging solutions?

Typical induction charging solutions like charging pads and electric toothbrushes require that the power source and receiving device be in very close proximity to one another to transfer power efficiently, usually within millimeters, which is essentially zero distance. These types of solutions typically require special alignment and charging pads or cradles. Powercast’s RF-based technology provides power-over distance to one or more devices for low-power applications and does not directly compete with induction-based charging technologies.