Wiktor Wise
In the context of electricity pathways, a receiver is a device that receives electrical energy transmitted wirelessly and converts it into a form that can be used to charge a battery or power a device directly. Wireless power transfer systems consist of a transmitter device connected to a power source, which generates a time-varying electromagnetic field to transmit power to a receiver device. The receiver device then extracts the power from this field and supplies it as an electrical load. This technology eliminates the need for physical wires, increasing convenience and reducing wear and tear on charging ports and cables. Receivers are commonly found in devices such as smartphones, electric toothbrushes, and electric vehicles, as well as in wireless powered communication networks and various modern technologies like televisions, cell phones, and wireless modems.
| Characteristics | Values |
|---|---|
| Definition | Any device that accepts signals, such as radio waves, and converts them into a useful form |
| Types | Radio receiver, broadcast receiver, wireless receiver, telephone receiver, television receiver |
| Function | Receives signals, converts them into a usable form, and extracts the desired information |
| Components | Antenna, electronic filters, electronic amplifier |
| Use Cases | Radio broadcasting, television, cell phones, wireless modems, wireless charging, radar, GPS |
| Benefits | Increased convenience, reduced wear and tear, improved safety, elimination of wires and batteries |
| Limitations | Energy loss, bulkiness, security and privacy concerns, limited environmental benefits, less efficient for high-power applications |
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What You'll Learn
Wireless power transfer
WPT techniques can be broadly categorized into near-field and far-field methods. In near-field or non-radiative techniques, power is transferred over short distances using magnetic fields and inductive coupling between coils of wire. Inductive coupling, the most widely used wireless technology, involves electromagnetic fields transferring power between a transmitter coil and a receiver coil. When the coils are aligned and in close proximity, electrical current flows through the receiver coil, charging the device's battery or powering it directly. This technology is commonly used in charging handheld devices, electric vehicles, and medical devices.
Resonant inductive coupling is an extension of inductive charging that improves power transfer efficiency. It involves tuning the transmitter and receiver coils to the same resonant frequency, allowing for efficient power transfer over greater distances. However, some wireless power transfer methods, such as resonant inductive coupling, may experience energy loss during the transfer between the transmitter and receiver coils.
Far-field or radiative techniques, also called power beaming, employ electromagnetic radiation like microwaves or laser beams to transfer power over longer distances. These techniques require the transmitter to be aimed at the receiver. Proposed applications for far-field methods include solar power satellites and wireless-powered drone aircraft.
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Inductive coupling
Wireless power transfer (WPT) is a technology that enables the transmission of electrical energy without wires. It involves a transmitter device that generates a time-varying electromagnetic field to transmit power to a receiver device, which then extracts the power and supplies it to an electrical load. This eliminates the need for wires and batteries, enhancing mobility, convenience, and safety for users.
In wireless power transfer, inductive coupling is achieved through the use of coils. The transmitter coil, typically located in a charging pad or base station, generates an electromagnetic field when electricity flows through it. The device being charged contains a receiver coil designed to pick up the energy from this field. When the coils are closely aligned, the electromagnetic field induces a flow of electrical current in the receiver coil, which can then charge a battery or power the device directly.
Resonant inductive coupling is an extension of inductive coupling that uses resonance to improve power transfer efficiency. It involves tuning the transmitter and receiver coils to the same resonant frequency, allowing for more efficient power transfer over greater distances. However, energy loss can occur as radio waves propagate between the coils, reducing overall efficiency.
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Receiver coil
In the context of electricity pathways, a receiver is a device that extracts power from a magnetic or electromagnetic field and supplies it to an electrical load. In wireless power transfer systems, the receiver device is typically a coil that receives the power transmitted by a transmitter coil and converts it into electrical energy that can be used by the device. These coils are often referred to as "receiver coils" or "wireless power transfer coils".
The design of receiver coils can vary depending on the specific application and requirements. For example, surface coils are designed to provide high RF sensitivity over a small region of interest, while volume coils offer homogeneous RF excitation across a large volume. The size and configuration of the coils can also be optimised for specific applications, such as head or extremity imaging in the case of volume coils used in MRI scanners.
The efficiency of power transfer between the transmitter and receiver coils is an important consideration. Techniques such as resonant inductive coupling aim to improve efficiency by tuning the coils to the same resonant frequency, allowing for more efficient power transfer over greater distances. The amount of power transferred can be influenced by factors such as the coupling constant, frequency, and quality factor of the receiver coil.
Overall, receiver coils play a crucial role in wireless power transfer systems, enabling the convenient and efficient charging of various devices without the need for physical wires or connectors.
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Energy transfer
Wireless power transfer (WPT) is a method of transmitting electrical energy without wires. It involves using electromagnetic fields to transfer power from a transmitter device to a receiver device. This technology eliminates the need for physical wires and batteries, increasing the convenience, mobility, and safety of electronic devices.
The process of wireless power transfer begins with the transmitter device, which is connected to a power source such as a mains power line. The transmitter converts the input power into a time-varying electromagnetic field, creating a "magic ring" of energy around it. This field is then picked up by the receiver coil in the device being charged. For efficient energy transfer, the transmitter and receiver coils must be properly aligned and in close proximity. When the coils are aligned, the electromagnetic field induces a flow of electrical current in the receiver coil, which can then be used to charge the device's battery or power it directly.
The receiver coil in the device being charged plays a crucial role in the energy transfer process. It is designed to receive the electromagnetic field transmitted by the transmitter coil and convert it into electrical current. This current is then used to charge the device's battery or power its functions. The receiver coil works in conjunction with the transmitter coil to ensure efficient and effective wireless charging.
Wireless power transfer has a wide range of applications, including charging handheld devices such as smartphones, electric toothbrushes, and electric vehicles (EVs). It is also used in medical devices, such as artificial cardiac pacemakers. Additionally, wireless power transfer can be utilised for wireless information transmitters or receivers, known as Simultaneous Wireless Information and Power Transfer (SWIPT) and Wireless Powered Communication Network (WPCN), respectively.
While wireless power transfer offers numerous advantages, there are also some considerations to keep in mind. One potential issue is energy loss during the transfer between the transmitter and receiver coils, especially in methods like resonant inductive coupling. There are also concerns about bulkiness, security, privacy, and environmental impact associated with wireless charging solutions. Despite these challenges, wireless power transfer continues to be a valuable technology, offering convenience and versatility in various applications.
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Radio receiver
In radio communications, a radio receiver is an electronic device that receives radio waves and converts the information carried by them into a usable form. Radio receivers are essential components of all systems based on radio technology.
A radio receiver may be a separate piece of electronic equipment, or it may be an electronic circuit within another device. The most familiar type of radio receiver for most people is a broadcast radio receiver, which reproduces sound transmitted by radio broadcasting stations. These are commonly called "radios" and are used for radio broadcasting. They receive audio programs intended for public reception transmitted by local radio stations.
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Frequently asked questions
A receiver in an electricity pathway is a device that accepts signals, such as radio waves, and converts them into a useful form.
A receiver coil in the device being charged picks up the energy from the electromagnetic field created by the transmitter coil. When the coils are aligned, the electromagnetic field induces a flow of electrical current in the receiver coil, which can then be used to charge a battery or power the device.
A radio receiver, also known as a wireless or simply a radio, is a common example of a receiver. It receives electromagnetic waves and converts them into sound or television pictures.
Wireless power transfer involves using electromagnetic fields to transmit electrical energy from the charging pad (transmitter) to the device (receiver) without any wires.
Wireless power transfer offers several advantages, including convenience, as it eliminates the need for physical cords and cables, and reduced wear and tear on charging ports and cables.
