Abstract:
PROBLEM TO BE SOLVED: To provide a radio communication method for a magnetic field communication network with which a number of sensor nodes can be recognized in a short time, and a demodulation device for a coordinator.SOLUTION: A radio communication method for a magnetic field communication network includes: a step (a) performed by a coordinator in the magnetic field communication network for transmitting to a sensor node a requirement signal requiring a response; a step (b) for selecting any one of response signals received from the sensor node; a step (c) for transmitting an approval signal to the sensor node corresponding to the response signal selected in the step (b); a step (d) for selecting any one of response signals retransmitted from sensor nodes that can not receive the approval signal in the step (c); and a step (e) for transmitting an approval signal to a sensor node corresponding to the response signal selected in the step (d).
Abstract:
PROBLEM TO BE SOLVED: To provide magnetic field based low frequency band radio communication for supporting a packet format, coding and modulation systems suitable between a master and a slave so as to carry out radio communication with a data rate or coding system variable according to peripheral environments in the magnetic field based low frequency band radio communication applied to adverse environments.SOLUTION: In a method of configuring a physical layer in magnetic field based low frequency band radio communication, a data rate and a coding system of a payload field contained in a request frame and a response frame between a master and a frame is made variable in accordance with a peripheral communication environment within a predetermined range. In such a configuration, the request frame and the response frame may be comprised of the same format but such request frame and response frame may include a preamble field, a header field and a payload field, respectively.
Abstract:
PURPOSE: A multi-mode wireless power transmission system using magnetic resonance induction and a charging method thereof are provided to efficiently charge wireless chargeable devices by utilizing other wireless chargeable devices as repeaters. CONSTITUTION: A wireless power transmission apparatus(100) transmits a charge ON signal to wireless chargeable devices(200_4,200_6) to charge and a repeater signal to wireless chargeable devices(200_3,200_5) which does not need charge. A control unit of a wireless chargeable device receiving the charge ON signal turns off a switch in an adaptive matching network and turns on a power control switch. A wireless chargeable device receiving the repeater signal turns on both the switches.
Abstract:
PURPOSE: A multi-node wireless power transmission system and a wireless chargeable device using magnetic resonance induction are provided to selectively charge a target device by receiving information from a plurality of wireless chargeable devices through a wireless power transmission device. CONSTITUTION: A power management unit(220_1) comprises a matching network(221), a rectifier(222), a power control switch(223), and a DC-DC converter(224). The DC-DC converter is connected to an external load of the power management unit. The power control switch receives an ON/OFF switching signal from a control unit. The matching network aligns frequency in order to induce resonance between a wireless chargeable device and a wireless power transmission device and implements impedance matching between a receiving antenna(210) and a wireless chargeable device.
Abstract:
PURPOSE: A magnetic resonance induction type wireless power transmission apparatus is provided to prevent the waste of energy by cutting off power supply when sensing foreign materials. CONSTITUTION: A power converting unit of a wireless power transmission apparatus comprises an oscillator(121) which creates a signal with a fixed frequency, a power amp(122), a matching network(123), and a current sensor(124) which is connected between the matching network and a transmission antenna(110) and measures current transferred from the matching network to the transmission antenna to sense current changes.
Abstract:
The present invention relates to a hardware platform for a multi-node wireless charging base station for wirelessly charging a plurality of devices using a magnetic resonance induction method, and to an energy transmission unit therefor. The hardware platform for a multi-node wireless charging base station of the present invention includes: an MCU controlling a main function of the wireless charging base station; a clock generator providing a clock to the MCU; a platform control module including a power control unit for controlling the power of a power-supply source for wireless charging, and a communication control unit; a hardware module combining charging and communication functions, including an optimizing unit for controlling power transmission in an optimized state according to a load, a transmission unit, and a communication unit; and an antenna module including an antenna for transmitting energy wirelessly, and an antenna interface unit for providing an interface between the energy transmission unit and the antenna.