Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Mirise Technologies Corporation

Imrise Technologies Corporation

Hyoungjun Na

Tomohiro Nezuka

Ken Toshiyuki

Yoshikazu Furuta

Shigeki Otsuka

Takasuke Ito

Shouji Abou

An insulated communication system includes a communication controller that sets communication data to a communication symbol through a numeral system and executes insulated communication through an insulator by adopting the communication symbol. The numeral system includes multiple states having a positive state, a negative state and a zero state. The positive state is represented by at least one positive integer, and the negative state is represented by at least one negative integer. The zero state is represented by zero being a level without generating current consumption. An absolute value of the at least one positive integer and an absolute value of the at least one negative integer are identical to each other. The communication controller sets an initial section of the communication data in the communication symbol to the positive state or the negative state, and sets a following section of the communication data to one of the multiple states.

Insulated communication system

A differential transmission circuit for a communication device performs bidirectional communication via a differential transmission line. The differential transmission circuit include: output transistors that are turned on and off according to a drive signal during a transmission period; a signal generation unit that generates and outputs the drive signal; short-circuit transistors connected between gates and drains of the output transistors; and a cut off unit that cuts off a supply path of the drive signal between the signal generation unit and the gates of the output transistors. The cut off unit cuts off the supply path of the drive signal during a reception period in which a reception operation is performed by the communication device.

Differential transmission circuit

In a communication system, a control unit and driver units are connected in a daisy chain; each unit includes a corresponding insulated communication circuit, respectively. The control unit measures a communication delay time between the control unit and each driver unit from a response time to transmission of a pulse signal performed to each driver unit during a measurement period. Then, based on each communication delay time, the control unit transmits a shift time to each driver unit for equalizing the timing of signals output by the driver units. When each driver unit receives, from the control unit, an instruction instructing each driver unit to output a signal, each driver unit outputs the signal when the shift time has elapsed.

Communication system

A differential communication circuit is connected to a communication line formed of a positive communication line and a negative communication line for differential communication. The differential communication circuit includes: a series circuit that includes a resistor element and a connection switch. The resistor element is connected between the positive and negative communication lines when the connection switch is turned on. The circuit also includes a transmission unit that is configured to output a differential signal to the communication line and a controller that is configured to change impedance of the communication line by turning on the connection switch in a period during which the transmission unit does not output the differential signal.

Differential communication circuit

A bidirectional power converter includes a first terminal, a second terminal, a main reactor, a plurality of sub-circuits and a controller. The sub-circuits each include an upper switching element, a lower switching element, two diodes, and a sub-reactor. The controller sequentially controls the sub-circuits such that: the lower switching element is turned on and turned off and then the upper switching element is turned on and turned off in each of the sub-circuits, while a current is flowing from the first terminal toward the second terminal; and the upper switching element is turned on and turned off and then, the lower switching element is turned on and turned off in each of the sub-circuits, while the current is flowing from the second terminal toward the first terminal.

Bidirectional power converter, electric vehicle, and control method for bidirectional power converter

A motor system may include three switching circuits, each of which includes two upper switching elements and two lower switching elements. A controller includes a signal output module, a signal distribution module, and a signal adjusting module. The signal output module outputs upper and lower PWM signals. The signal distribution module distributes each of the upper (lower) PWM signals alternately to the first upper (lower) switching element and the second upper (lower) switching element of corresponding one of the switching circuits. The signal adjusting module inverts all the PWM signals output by the signal output module when (1) each of currents flowing through two of the three coils has a negative value and all the three upper PWM signals are at HIGH level, or (2) each of currents flowing through two of the three coils has a positive value and all the three lower PWM signals are at LOW level.

Motor system

A switching circuit includes a wiring into which a parallel circuit of a first IGBT and a second IGBT is inserted, and a gate control circuit. The gate control circuit has a first switching element configured to control a gate potential of the first IGBT according to a potential of a second principal electrode, and a second switching element configured to control a gate potential of the second IGBT according to a potential of a fourth principal electrode. An output terminal of the control device is connected to the first switching element through a first switch and is connected to the second switching element through a second switch. The control device applies a control signal to the output terminal in a state where the first switch and the second switch are turned on when switching both of the first IGBT and the second IGBT.

Switching circuit

A switching circuit switches a first IGBT and a second IGBT. A control circuit is equipped with a first switching element that is configured to be able to control a gate current of the first IGBT, a second switching element that is configured to be able to control a gate current of the second IGBT, and a third switching element that is connected between an electrode of the first IGBT and an electrode of the second IGBT. The control circuit controls a turn on timing and turn off timing.

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Nagoya, Japan

Hyoungjun Na