Toyota Jidosha Kabushiki Kaisha

Takuya Yamamoto

Yoshinori Kadowaki

Akihiro Yanai

Tomohiro Usami

Yoh Satoh

A power supply system includes: a first power storage device; a second power storage device having a lower voltage than the first power storage device; a DC-DC converter including a choke coil, a first switching element, a diode connected in parallel with the first switching element, and a second switching element; a semiconductor relay configured to switch a connection state between a second end of the choke coil and the second power storage device; and a controller configured to perform PWM control of the first switching element and the second switching element to control ON and OFF of the semiconductor relay. When an ON time of the second switching element is controlled to become zero and a current flowing out from the second power storage device exceeds a first reference current, the controller reduces a duty ratio of an ON time of the first switching element.

Power supply system

A method of controlling switching primary and secondary full-bridge circuits, includes, when a fault is detected in a first voltage detection unit that detects the voltage of a first port, deriving a command duty cycle to adjust the voltage of a second port to a target voltage, by receiving feedback of a detected voltage of the second port by a second voltage detection unit; deriving an estimated phase difference corresponding to target power of transmission power transmitted from the secondary full-bridge circuit to the primary full-bridge circuit, and the command duty cycle, from a correspondence relation among a phase difference between switching of the primary and secondary full-bridge circuits, a duty cycle of the switching of the primary full-bridge circuit, and the transmission power; and controlling the phase difference to the estimated phase difference, and controlling the duty cycle to the command duty cycle.

Method of controlling power conversion apparatus, and power conversion apparatus

A power conversion apparatus includes a primary side circuit having a primary side port; a secondary side circuit having a secondary side port; and a control unit that derives a control constant suitable for a feedback value according to a relationship rule between the feedback value and the control constant, and adjusts a phase difference between the primary side circuit and the secondary side circuit using the control constant that is derived from the relationship rule, so as to control transmitted power that is transmitted between the primary side circuit and the secondary side circuit, wherein the feedback value is obtained based on current flowing to the primary side port or the secondary side port.

Power conversion apparatus and power conversion method based on a control constant and a feedback value based on current flow

A GNSS receiver includes: a first correlation peak detecting unit () that detects a peak of a correlation value between a positioning signal and a C/A code replica signal; a second correlation peak detecting unit () that detects a peak of the correlation value through a multipath error reduction technique; a signal intensity detecting unit () that detects a signal intensity of the positioning signal; a switching unit () that inputs the positioning signal to the second correlation peak detecting unit () when the signal intensity is higher than or equal to a threshold, and inputs the positioning signal to the first correlation peak detecting unit () when the signal intensity is lower than the threshold; a pseudo-range calculation unit () that calculates a pseudo-range based on the detected correlation peak; and a positioning calculation unit () that calculates a location of the GNSS receiver based on the pseudo-range.

Growing community of inventors

Nagoya, Japan

Takuya Yamamoto