Yazaki Corporation

Honda Motor Co., Ltd.

Keisuke Ueta

Yoshihide Nakamura

Akinori Maruyama

Yoshinori Ikuta

Takashi Kikuchi

Syunsuke Nagakura

Takahiro Miyakawa

Tomoya Nishino

Noboru Ujigawa

Seiju Kawamata

Masataka Tsukioka

Rikuya Ezoe

Shuuji Satake

Yasuyuki Shigezane

Yoshiya Ohnuma

Yo Yanagida

Takahiro Nakahara

Antony Wambugu Ngahu

Takashi Shiroki

Kentaro Imoto

Hideo Suganuma

Shohei Komeda

A charger includes a rectifier including two input terminals for connection to an AC power supply, a cathode terminal and an anode terminal, a DC/DC converter including a first terminal be connected to the cathode terminal, a second terminal to be connected to the anode terminal, and two output terminals for connection to a battery, a power pulsation absorbing circuit including a first diode, a second diode, a third diode, an inductor, a capacitor, a first switch and a second switch, and a control section configured to control a switch of the DC/DC converter, the first switch and the second switch, wherein the control section is configured to control the DC/DC converter, the first switch and the second switch in such a way that a sum of a power outputted from the AC power supply and a power outputted from the capacitor is constant.

Charger that enables absorption of power pulses

A connector to be applied to a power supply system includes: a first connector main body having a first power transmission coil, a first signal transmission coil, and a first case; and a second connector main body having a second power transmission coil, a second signal transmission coil, and a second case. In the first connector main body and the second connector main body, the first case and the second case are relatively rotatable about a rotation axis along a fitting direction with a positional relation that the first power transmission coil and the second power transmission coil are opposed to each other and the first signal transmission coil and the second signal transmission coil are opposed to each other in a state in which the first case and the second case are mutually fitted.

Connector and power supply system

A power receiving device includes a secondary coil, a synchronous rectifier circuit, a smoothing circuit, and a reverse flow suppression circuit. The secondary coil receives the alternate current power wirelessly transmitted from the primary coil. The synchronous rectifier circuit includes a switching element unit that rectifies the alternate current power received by the secondary coil into direct current power. The smoothing circuit smooths the direct current power rectified by the synchronous rectifier circuit. The reverse flow suppression circuit controls the switching element unit. For example, the reverse flow suppression circuit turns off the switching element unit of the synchronous rectifier circuit when a current flowing from the synchronous rectifier circuit to the smoothing circuit is smaller than a predetermined current threshold value.

Power receiving device

An electric wire protection device includes a voltage adjusting unit that adjusts voltage of a power source side and supplies the resulting voltage to a load, and a controller that includes a calculation unit configured to compute temperature information of an electric wire connecting the power source and the load from a value of an electric current flowing through the voltage adjusting unit, and that is configured to make the voltage adjusting unit into a shutoff state of shutting off the power source and the load on the basis of the temperature information.

Electric wire protection device and control method for electric wire protection device

A vehicle information display system includes: a master-side instrument including a first power transmission coil, a first signal transmission coil, and a first case; and a meter instrument including a display unit, a second power transmission coil, a second signal transmission coil, and a second case. The master-side instrument and the meter instrument have a positional relation such that in a state in which a fitting recessed part of the first case and the second case are fitted to each other, the first power transmission coil is opposed to the second power transmission coil, and the first signal transmission coil is opposed to the second signal transmission coil.

Vehicle information display system

An electric wire protection device includes a voltage adjuster that adjusts voltage on a power source side to be supplied to a load and a controller that includes a temperature calculation part which calculates temperature information of an electric wire based on a current value flowing through the voltage adjuster. The controller sets a first time constant as a time constant used to calculate the temperature information while the voltage adjuster is in the interrupted state, and sets a second time constant as a time constant used to calculate the temperature information while the voltage adjuster supplies power to the load. The first time constant is a value larger than the second time constant and equal to or larger than an actual time constant of the electric wire, and the second time constant is a value smaller than the actual time constant of the electric wire.

Electric wire protection device

An electric-wire protection device includes a voltage adjustment unit that adjusts the voltage to a load, and a controller that includes a temperature calculation unit that calculates temperature information on an electric wire from a value of current, and makes the voltage adjustment unit into a shut-off state based on the temperature information. The temperature information is calculated from an amount of temperature changes based on the current value and a predetermined initial value. The controller shifts into a sleep state when a sleep condition is satisfied that includes a condition that the temperature information is lower than the initial value. The initial value when the controller returns from the sleep state is based on a convergence value of temperature in conducting energization on the electric wire at a maximum value of steady-state current.

Electric-wire protection device

A protector for an electricity supply circuit includes: a power switch for switching between connection and disconnection of the electricity supply circuit; a controller configured to output a switching command signal to the power switch in accordance with an input signal; and a current detector for detecting current flowing to the electricity supply circuit. The controller includes: a lower limit threshold determination unit configured to determine whether or not an estimated temperature of a power line has dropped below a lower limit threshold; a timer for counting the time that passes after a load has been turned off, when the load is turned off by the power switch; and a mode switching unit configured to switch the controller to a sleep mode when a predetermined time is counted by the timer and the lower limit threshold determination unit determines that the estimated temperature has dropped below the lower limit threshold.

Protector for electricity supply circuit

A non-contact power transmission device includes a resonance coil and a resonance capacitor, and includes impedance variable circuits the impedance of which can be changed. In the non-contact power transmission device, a power transmission side controller changes impedance of one of the impedance variable circuits, a power reception side controller changes impedance of the other one of the impedance variable circuits, and output impedance on a power supply side with respect to a power transmission coil unit and input impedance on a load side with respect to the power transmission coil unit are matched.

Non-contact power transmission device

When supplying electric power to a load from a power supply via a parallel circuit of two electrical wires having the same wiring resistance, a vehicular power supply control device uses a current measurement unit in intelligent power devices (IPDs) to measure a passing current flowing in a semiconductor switching device in each of the electrical wires. Then, in order to match the temperatures of the electrical wires as estimated by a present temperature estimation unit base on the measured current, a target duty ratio in a PWM control for reducing the passing current in the semiconductor switching device of the IPD on one electrical wire is calculated in a target duty ratio calculation unit, and the semiconductor switching device of the one IPD is turned on and off by a PWM/DC control and shutoff determination unit with the calculated target duty ratio.

Vehicular power supply control device and a controlling method of the same

A vehicular power source controller is designed so that when there is abnormal action in a microprocessor and an abnormal fuse state cannot be determined from the current of a load detected by a current sensor circuit, power supply to the load cannot be turned on and off by the operation of a combination switch corresponding to the load, but can be turned on and off by the operation of an ignition switch. It is thereby possible to prevent continuing power supply to the load when the combination switch is turned on during the abnormal action of the microprocessor, and battery exhaustion can be suppressed. Power supply to the load cannot be turned on and off by the operation of the combination switch during the abnormal action of the microprocessor, and an operator is easily made aware of the abnormal action of the microprocessor.

Vehicular power source controller

A load drive circuit shuts off power supply to a load when a semiconductor relay is off. The load drive circuit includes: the semiconductor relay which is turned off when a predetermined operation voltage cannot be secured; a low-voltage detection circuit which detects that the operation voltage is a predetermined value or less; a negative-voltage generation circuit which generates a negative voltage; and a switch unit which is turned on and connects between the negative-voltage generation circuit and a ground terminal of the semiconductor relay, in a case where the low-voltage detection circuit detects that the operation voltage is the predetermined value or less.

Load drive circuit

When a power switch is turned off, a protection device for an electricity supply circuit starts keeping time using a timer and turns on a disconnection flag. Then the protection device turns off the disconnection flag when the timer has counted a predetermined time. When the power switch is turned off, the disconnection flag does not subsequently turn off until the predetermined time has passed. Therefore, it is possible to prevent an excessive temperature increase in the power switch and prevent damage to the power switch.

Protection device for electricity supply circuit

A switching circuit protector switches a semiconductor device () provided in a switching circuit connecting a power supply (VB) to a load (RL), from a PWM drive state to a DC drive state when an estimated temperature of a cable of the switching circuit estimated by a temperature estimator () exceeds a threshold temperature (Tth), in the state where the semiconductor device () is controlled to operate in the PWM drive state to drive the load (RL). Therefore, when an overcurrent is caused in the cable, the estimated temperature exceeds the threshold temperature (Tth) so as to break the semiconductor device (). Accordingly, the switching circuit can surely be protected by the switching circuit protector.

Switching circuit protector

An electric power distribution device sets a first threshold and a second threshold for a threshold temperature of main wires, and sets a third threshold and a fourth threshold for a threshold temperature of branch wires. In the case where a temperature of each of the main wires reaches the first threshold, all of branch wire switches provided in a branch wire distributor are shut off. Thereafter, in the case where the temperature of the main wire reaches the second threshold, each of the main wire switches, which is provided a main wire distributor, is shut off. In the case where a temperature of a certain branch wire reaches the third threshold, the corresponding branch wire switch is subjected to PWM control. Thereafter, in the case where the temperature of the branch wire reaches the fourth threshold, the corresponding branch wire switch is shut off.

Growing community of inventors

Shizuoka, Japan

Keisuke Ueta