Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Denso Corporation

Kenichi Takagi

Kenichiro Nagashita

Shuntaro Inoue

Takahide Sugiyama

Masanori Ishigaki

Takahiro Hirano

Jun Muto

Masaki Okamura

Takaji Umeno

Yoshitaka Niimi

Yasuharu Terada

Masaru Sugai

Fumiki Tanahashi

Katsuhiko Mutoh

Keisuke Ishikawa

Naoto Kikuchi

A non-contact power transmission device is configured with which a primary circuit that supplies power and a secondary circuit that supplies the power supplied from the primary circuit to a load are coupled via a transformer, the non-contact power transmission device capable of connecting a storage battery and an application using the primary circuit and the secondary circuit.

Non-contact power transmission device, battery pack and power grid system in which said noncontact power transmission device is used, and power transmission method

A power supply circuit includes inductors, capacitors, and switching elements. Ports are electrically insulated from each other. Two switching elements are alternately switched, and two other switching elements are alternately switched. The inductors are wound such that a magnetic flux is generated in the same direction when a phase difference between the switchings of the switching elements is zero. Duties of the switchings of the switching elements are changed equally, and a phase difference between the switchings is changed.

Power supply circuit including converter and power supply system using the same

A power converter includes first and second switching circuitsand, a primary winding Thaving both ends connected to the first switching circuit, a secondary winding Thaving both ends connected to the second switching circuitand magnetically coupled with the secondary winding T, and a reactor L having a first end connected to a center tap m of the primary winding T. The first switching circuitincludes a full bridge having half bridges U and V connected in parallel, and diodes Dand Deach having one end connected to a common point. The diodes Dand Deach have the other end connected to one of two parallel connecting points of the full bridge. Input alternating-current voltage Vin is applied between a second end of the reactor L and the connecting point of the diodes Dand D

Power converter

An electric power conversion circuit comprises U-phase and V-phase switching circuits, a transformer, and an &#x3b1;-phase switching circuit. A primary winding of a transformer is connected between the U-phase switching circuit and the V-phase switching circuit, and both ends of a secondary winding are connected to the &#x3b1;-phase switching circuit. The &#x3b1;-phase switching circuit comprises positive and negative terminals, a half bridge including and two switching devices, and a voltage divider circuit. The half bridge is provided between the positive terminal and the negative terminal, and a common connection point between the two switching devices is connected to one end of the secondary winding. A voltage divider output point of the voltage divider circuit is connected to the other end of the secondary winding.

Electric power conversion circuit

There is provided a power supply system including a first power supply and a second power supply. The power supply system includes a power conversion circuit capable of bidirectionally sending and receiving power by bidirectional voltage conversion between the first power supply and the second power supply, converting the first voltage from the first power supply to output a third voltage and a fourth voltage, and converting the second voltage from the second power supply to output the third voltage and the fourth voltage.

Power supply system

The present invention provides a power conversion circuit system in which a circulating current can be reduced by accurately detecting the circulating current, to thereby improve efficiency in power conversion. The power conversion circuit system includes a power conversion circuit composed of a primary conversion circuit having left and right arms and a secondary conversion circuit having left and right arms, and a control circuit for controlling switching of switching transistors in the primary and secondary conversion circuits. The control circuit detects the circulating current at at least one of timings lagged by &#x3c0;/2+&#x3c6;/2 from at least either a peak timing or a valley timing in a carrier counter where &#x3c6; represents a difference in phase between the primary and secondary conversion circuits, and performs feedback control for reducing the detected circulating current to zero.

Isolated DC-DC power conversion circuit system with circulating current reduction

An onboard display system includes two display groups; each display group includes a display apparatus and a control apparatus. The first control apparatus of the first display group includes the following: a first state acquisition section that acquires a first operating state of the first control apparatus itself; a second state acquisition section that acquires a second operating state of the second control apparatus of the second display group; a state determination section that determines whether a display prioritization state takes place based on the first operating state and the second operating state; and an image update section that updates, in chronological order, images in a video displayed in the first display apparatus of the first display group when the display prioritization state takes place or that suspends the updating when the display prioritization state does not take place.

Onboard display system

An electric power conversion circuit system for reducing core loss in a transformer particularly during light loading and improving conversion efficiency during light loading comprising an electric power conversion circuit composed of a primary side conversion circuit having a left arm and a right arm and a secondary side conversion circuit having a left arm and a right arm, and a control circuit for controlling switching of switching transistors of the first side conversion circuit and the secondary side conversion circuit. When the output voltage is at a relatively light load, the control circuit controls to change the duty of the transmitting side among the primary side conversion circuit and the secondary side conversion circuit and controls to change the half-bridge phase differences of the left arm and the right arm of the primary side conversion circuit and the secondary side conversion circuit, respectively.

Electric power conversion circuit system

A magnetically coupled reactor includes a coupled core member, a first coil, and a second coil. The coupled core member includes a first core and a second core made of a magnetic material and disposed to face each other, a coil channel, and a sheet-like magnetic body by which a coupling portion between cores is put between the first core and the second core at an outer portion of the first and second cores. Each coil is wound around a leg through the coil channel in a lap winding manner such that the coils are overlapped on top of each other in the coil channel when seen in an axial direction. The sheet-like magnetic body extends from the coupling portion between coils into the coil channel and includes a portion arranged between coils located between the coils in the axial direction.

Magnetically coupled reactor and power converter

There is provided an electric power conversion circuit system having a primary side electric power conversion circuit, a secondary side electric power conversion circuit, and a control circuit. The control circuit sets at least one of a half-bridge phase difference between a lower-left-arm transistor and a lower-right-arm transistor of the primary side electric power conversion circuit and a half-bridge phase difference of the secondary side electric power conversion circuit based on OFF periods of the primary side and secondary side electric power conversion circuits, dead-times of the primary side and secondary side electric power conversion circuits, and an amount of change of a power supply voltage so that a current in a non-transmission period of electric power is zero between the primary side and secondary side electric power conversion circuits.

An electric power conversion system includes: a primary electric power conversion circuit including a primary coil connected to a connection point between a plurality of transistors; a secondary electric power conversion circuit configured similarly to the primary electric power conversion circuit and including a secondary coil corresponding to the primary coil; and a control circuit controlling transfer of electric power between the primary and secondary electric power conversion circuits. The control circuit executes feedforward control for setting one of an on/off ratio of a terminal voltage signal of the primary coil and an on/off ratio of a terminal voltage signal of the secondary coil, in response to at least one of fluctuations in voltage ratio between both waveforms and fluctuations in phase symmetry between both waveforms, when the terminal voltage waveform of the primary coil and the terminal voltage waveform of the secondary coil are different from each other.

Electric power conversion system

An electric power conversion system includes: a primary electric power conversion circuit including primary right and left arms; a secondary electric power conversion circuit including secondary right and left arms; and a control circuit controlling transfer of electric power between the primary and secondary electric power conversion circuits by magnetically coupling a primary coil to a secondary coil. The control circuit sets an interphase difference in switching between right and left arm lower transistors in the primary electric power conversion circuit and an interphase difference in switching between right and left arm lower transistors in the secondary electric power conversion circuit on the basis of off times of the primary and secondary electric power conversion circuits such that a phase difference between terminal voltage waveforms of the primary and secondary coils is 0 and duty ratios of the terminal voltage waveforms are equal to each other.

A drive circuit is provided with a charge pump including a capacitor. The capacitor of the charge pump is configured to be charged in the first stage and to be connected with the gate terminal of the switching device in the second stage. The charge pump is configured to be able to adjust a charging voltage charged in the capacitor according to an order signal.

Drive circuit

A radio receiver device includes a radio signal processing section and a digital processing section. The radio signal processing section converts a received radio signal into a digital signal, demodulates the digital signal and detects a S/N ratio of the radio signal. The digital processing section digitally processes digital signals and switches over its operation mode based on the detected S/N ratio, thereby controlling a digital noise generated in the digital processing. The radio processing section checks whether the S/N ratio is lowered by a digital noise of the digital processing section or a shielding body external to the radio receiver device. The digital processing section switches over its operation mode to reduce the digital noise only when the cause of the fall of the S/N ratio is caused by the digital noise.

Growing community of inventors

Nagakute, Japan

Kenichi Takagi