Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Daisuke Bessyo

Naoyoshi Maehara

Takahiro Matsumoto

Hideki Sadakata

Atsushi Fujita

Shigeru Kusunoki

Yuji Nakabayashi

Kazuho Sakamoto

Yoshiharu Omori

Takashi Niwa

Haruo Suenaga

Koichi Takemura

Takashi Kashimoto

Fumikazu Shiba

Takao Shitaya

Hajime Miyata

Kenichi Kamon

Ryuji Iwamoto

Makoto Shibuya

Youichi Itou

Hiroaki Kurihara

Shinichi Sakai

Yutaka Takahashi

Makoto Mihara

Kenji Yasui

Takeshi Nagai

Kenzo Ohji

Hideki Omori

Yoshiaki Ishio

Akio Tajima

Keijirou Kunimoto

Susumu Kiritoshi

Shiro Takeshita

Hideki Morozumi

Hiokaki Moriya

Hidetomo Nagata

A wireless power transmission device comprises: a ground-side coil () for generating a magnetic field by current supplied from a power control device (); a current transformer () for detecting the magnitude of an input from the power control device (); a power supplying device-side control unit () for, based on a detection signal from the current transformer (), controlling the current supplied from the power control device () to the ground-side coil (); and a vehicle-side coil () for receiving power via the magnetic field coming from the ground-side coil (). When detecting an input change having a predetermined value or more on the basis of the detection signal from the input detection unit (), the power supplying device-side control unit () stops the current supplied to the ground-side coil ().

Wireless power transmission device

A coil for a non-contact power transmission system according to the present disclosure is used in a non-contact power transmission system to transmit electric power via a non-contact method. The coil includes a first coil in which a wire is wound around at a center of a core; and a second coil placed at an end of the core, and wound with the wire. Winding axes of the first and second coils are oriented in different directions.

Coil for non-contact power transmission system and non-contact power transmission system

The present disclosure provides a non-contact charging apparatus including a power transmitting coil and a power receiving coil which face each other. At least one of the power transmitting coil or the power receiving coil includes a magnetic body and a coil wound around the magnetic body. The magnetic body has, on both end portions, exposed regions in which the wound coil is absent. One of the exposed regions that is on a face facing the power transmitting coil or the power receiving coil is larger than another one of the exposed regions that is on a face not facing the power transmitting coil or the power receiving coil.

Non-contact charging apparatus having differently sized exposed regions on opposing faces of magnetic body

A non-contact charger aims to control transmitted power efficiently. The non-contact charger includes a transmitting coil, an inverter circuit, a receiving coil, and a transmitted power control circuit. The inverter circuit outputs the transmitted power to the transmitting coil. The receiving coil receives power as received power from the transmitting coil. The transmitted power control circuit drives the inverter circuit at a frequency higher than maximum received power frequencies at which the received power has one or two maximum values.

Non-contact charging device and non-contact charging method

A power feeding device of a non-contact charging device includes a power factor improvement circuit which converts an AC power supply to DC, and improves a power factor, a smoothing capacitor connected to an output end of the power factor improvement circuit, an inverter circuit which includes a plurality of switching elements, and generates an AC signal using a voltage of the smoothing capacitor as a power supply, a power feeding section which feeds power based on the AC signal to a power receiving device, and a control circuit which modulates at least one of a duty factor or an operation frequency of each of the switching elements of the inverter circuit in synchronization with the AC power supply.

Power feed device of inductive charging device

A power feeding device of a non-contact charging device includes a power factor improvement circuit which converts an AC power supply to DC, and improves a power factor, a smoothing capacitor connected to an output end of the power factor improvement circuit, an inverter circuit which includes a plurality of switching elements, and generates an AC signal using a voltage of the smoothing capacitor as a power supply, a power feeding section which feeds power based on the AC signal to a power receiving device, and a control circuit which modulates a duty factor of each of the switching elements of the inverter circuit in synchronization with the AC power supply, wherein the control circuit controls the plurality of switching elements so that an increment of the modulated duty factor is not equal to a decrement of the modulated duty factor.

Disclosed is a noncontact power transmission system including a power transmission device for transmitting power to a power receiving device in a noncontact manner. The power transmission device includes a cover covering a portion of an outline of the power transmission device where the power transmission device faces the power receiving device, a base covering another portion of the outline of the power transmission device where the power transmission device does not face the power receiving device, a magnetic body arranged in a space enclosed with the cover and the base, a coil bobbin covering the magnetic body partially or entirely, and a coil wire which is wound around the coil bobbin and which generates a magnetic flux upon receiving an alternating current. The coil bobbin includes a load support.

Noncontact electric power transmission equipment

Detecting a leak, or the like, with high accuracy on the basis of pressure and a flow volume acquired during use of fluid is made possible. A volume of gas flowing through a flow pathis measured by a flow volume measurement unit, and pressure is measured by a pressure measurement unit. Measured flow data and measured pressure data are input to an analysis unit, to thus analyze following of a pressure change by a flow volume change. An amount of flow volume change responsive to an amount of pressure change of a predetermined level or more is classified into a plurality of ranges by means of a predetermined threshold value, and a following flow value change is determined on the basis of determination conditions of the respective ranges of amounts of flow volume changes.

Flowmeter

To find the propagation time of an ultrasonic wave, a difference occurs between the waveforms received upstream and downstream in a portion where the reception amplitude is comparatively large and it is prevented from being detected as an error of the propagation time. A reception signal is amplified in a reception unitand reception point storage unitsstore the most recent reception point data in a plurality of storage sections in order until the signal level becomes a predetermined value (Vref). An average value of the two zero crossing points before and after the signal level becomes Vref can be adopted as a reception point, the propagation time with a small error of up and down offset, etc., is measured, and it is made possible to realize power saving operation by shortening the measurement time.

Flow measurement device

Detecting a leak, or the like, with high accuracy on the basis of pressure and a flow volume acquired during use of fluid is made possible. A volume of gas flowing through a flow pathis measured by a flow volume measurement unit, and pressure is measured by a pressure measurement unit. Measured flow data and measured pressure data are input to an analysis unit, to thus analyze following of a pressure change by a flow volume change. A determination showing that a following flow volume change is present, that a following flow volume change is not present, or that a following flow volume change is uncertain is made according to a magnitude correlation between an amount of pressure change of a predetermined level or more and an amount of flow volume change.

The present invention provides an ultrasonic flowmeter comprising an oscillator and an oscillation start unit for accelerating oscillation of the oscillator. The oscillation start unit accelerates the oscillation of the oscillator so that pulses from the oscillator will become stable in a shorter time period. The accuracy of flow rate measurement is improved. Electric power can be saved where the flow rate is measured repeatedly at intervals.

Ultrasonic flowmeter including an oscillation start unit for acceleration stability of the oscillator

A measurement control section includes a time measuring section for controlling an operation of measuring a travel time of an ultrasonic wave. The measurement control section operations, based on a high rate clock signal supplied from a ceramic oscillation circuit during the time measuring operation. A clock control section stops the high rate clock signal supplied from the ceramic oscillation circuit every time when the time measuring section completes its time measuring operation, and uses a low rate clock signal supplied from a quartz oscillation circuit to count a standby time between the end of measuring the travel time and the start of carrying out the next measuring operation.

Fluid flow measuring instrument

An acoustic matching member is used, when a sound is propagated from a first object to a second object, for matching an acoustic impedance of the first object and an acoustic impedance of the second object. The acoustic matching member includes a plurality of fine pieces , and at least one of the plurality of fine pieces is bonded with at least another of the plurality of fine pieces at a contact portion so as to form a gap in the acoustic matching member

Acoustic matching material, method of manufacture thereof, and ultrasonic transmitter using acoustic matching material

A high frequency heating apparatus including a circuit for driving a magnetron. A circuit comprises a leakage transformer, a second capacitor connected in series to primary coil of said leakage transformer, a second switching device connected in parallel with a series circuit of said primary coil and second capacitor, a first capacitor connected in parallel with said second switching device, and a first switching device connected in series to said second switching device. Under a structure of the present invention, the switching device and the leakage transformer, both being the key components of the circuit, may respectively be used in common either on a circuit of 200V-240V commercial power supply or on a circuit of 100V-120V commercial power supply. This enables volume production of the key components, which leads to a benefit of reduced cost of the components as well as the cost of heating apparatus.

Growing community of inventors

Shiga, Japan

Daisuke Bessyo