Mitsubishi Heavy Industries Thermal Systems, Ltd.

Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd.

Mitsubishi Heavy Industries Limited

Keiji Nagasaka

Hidetaka Sato

Koji Nakano

Tomoyasu Osaki

Hideo Nakamura

Masatoshi Morishita

Shunsuke Yakushiji

Satoshi Kominami

Shiro Matsubara

Ryota Kojima

Makoto Hattori

Kenji Shimizu

Hiroyuki Kamitani

Takashi Nakagami

Masanori Maruyama

Yuji Maekawa

Masaya Mitake

Yuichiro Yazaki

Kiyotaka Sumito

A bidirectional DC-DC converter includes a first circuit that is configured to process a first voltage being a DC voltage and that includes a first electronic component including a first switching element; a second circuit that is configured to process a second voltage or a third voltage, the second voltage being a DC voltage supplied to an electric vehicle, the third voltage being a DC voltage generated in an electric vehicle, and that includes a second electric component with a lower withstand voltage than the first electronic component, the second electric component including a second switching element; and a control circuit configured to control switching of at least one of the first switching element and the second switching element wherein the bidirectional DC-DC converter is configured to convert the first voltage into the second voltage or convert the third voltage into the first voltage.

Bidirectional DC-DC converter, traffic system, control method, and non-transitory computer-readable storage medium

This vehicle-mounted air conditioner control device () comprises: a PTC heater (H) that is included in a high-voltage system circuit (HV) and generates heat by the power supplied from a high-voltage battery (B); and a microcomputer () that is included in the high-voltage system circuit (HV) and controls the power supply from the high-voltage battery (B) to the PTC heater (H). This vehicle-mounted air conditioner control device () further comprises: a water temperature sensor () that is included in a low-voltage system circuit (LV) and outputs a voltage signal corresponding to the temperature of hot water; and a V/f conversion unit () that is included in the low-voltage system circuit (LV) and converts the voltage signal output from the water temperature sensor () into a frequency signal. This vehicle-mounted air conditioner control device () further comprises a digital isolator () that transmits the frequency signal to the microcomputer () while maintaining electrical insulation between the V/f conversion unit () and the microcomputer ().

Vehicle-mounted air conditioner control device, and vehicle

This on-board air conditioner control device comprises: a PTC heater which is contained in a high-voltage circuit and generates heat by means of power supplied from a high-voltage battery; a micro-controller which is contained in a low-voltage circuit and controls the power supplied to the PTC heater from the high-voltage battery; a current detection sensor which is contained in the high-voltage circuit and outputs a voltage signal indicating a value for the current flowing through the PTC heater; a V/f conversion unit which is contained in the high-voltage circuit and converts the voltage signal outputted by the current detection sensor to a frequency signal; and a digital isolator which transmits the frequency signal to the micro-controller while preserving electrical insulation between the V/f conversion unit and the micro-controller.

On-board air conditioner control device, and vehicle

A drive apparatus providing a heat source and driving a switching element, along with a corresponding method of using the drive apparatus. The switching element includes a transistor having a high-heat resistant semiconductor including silicon carbide. The drive apparatus is provided with a voltage adjusting unit that varies a drive voltage to be applied to a conduction control terminal of the switching element in order to put the switching element in an ON state, and the voltage adjusting unit applies, as the drive voltage, a voltage in an active region of the transistor to the conduction control terminal.

Apparatus and method for driving a switching element, and a vehicle air-conditioning apparatus

The on-state malfunction detection device detects an on-state malfunction, for instance, in an IGBT that is provided to correspond to a PTC element whose electrical resistance value varies according to temperature and that controls the electrification of the PTC element. In a state in which a turn-off instruction has been outputted from a control device to the IGBT, the on-state malfunction detection device determines through calculation an electric potential difference following voltage division of the voltage between the both ends of the PTC element, and detects an on-state malfunction of the IGBT when this electric potential difference is equal to or greater than a predetermined threshold value. This allows for the detection of an on-state malfunction in a switching element that performs an electrical conduction control for an element whose electrical resistance value varies according to temperature.

On-state malfunction detection device and method therefor

The inverter-integrated electrical compressor is provided with an inverter-accommodating case () partitioned by a partitioning wall () and a low-pressure refrigerant channel inside a housing, an inverter device () being incorporated within the inverter-accommodating case (); wherein the inverter device () is provided with a plurality of high-voltage electric components () constituting a filter circuit, a plurality of semiconductor switching elements (), and a control substrate () on which an inverter circuit and a control circuit are mounted; and the plurality of semiconductor switching elements () are installed in a fixed manner on the side surfaces () of a heat-radiating block () provided perpendicularly relative to the partitioning wall ().

Inverter-integrated electrical compressor

A refrigerant heating performance is increased while suppressing an increase in weight or cost. A vehicle air-conditioning device () is provided with a heat pump cycle () for heating operation in which an electric compressor () for compressing refrigerant, a vehicle-cabin-interior condenser (), a throttle (), and a vehicle-cabin-exterior heat exchanger () are connected in that order via refrigerant piping. An inverter for the electric compressor () in which a power element comprising a highly heat-resistant semiconductor device is used is disposed on the electric compressor () so that the refrigerant compressed by the electric compressor () can be heated by the power element. During heating operation of the heat pump cycle (), the refrigerant is heated by the power element.

Vehicle air conditioning device, electric compressor, and vehicle air conditioning method

The purpose of the present invention is to improve responsiveness to short-circuit detection and rapidly cut off power supply to a load when a short circuit occurs. When a short circuit occurs, voltage exceeding the reference voltage of a comparison circuit is inputted as an input signal from a voltage output circuit, and a high signal is outputted from the comparison circuit. An FET is turned on by the output of the comparison circuit changing to the high signal. Consequently, an electric charge stored between the gate and emitter of an IGBT is discharged through a resistor, gate voltage decreases, and thereby the IGBT is turned off. The high signal of the comparison signal is held for a predetermined period by a holding circuit, and the IGBT is maintained in the off state over this period.

Load driving device, vehicle air-conditioning apparatus, and load short-circuit protection circuit

A heater control device includes a current calculating unit () which calculates a third value of current based on a first value of current flowing through a first PTC element of a first PTC heater which is in an energized state and a second value of current estimated to flow through a second PTC element of a second PTC heater which is to be newly put into an energized state next, and a switching control unit () which maintains a non-energized state of the second PTC element of the second PTC heater until it is determined that the third value of current calculated by the current calculating unit () is less than a predetermined maximum allowable value of current and puts the second PTC element of the second PTC heater into an energized state when the third value of current is less than the predetermined maximum allowable value of current.

Heater control device, and control method and control program for heater control device

A heater control device having at least two PTC heaters having PTC elements includes switching units which are provided so as to correspond to the PTC heaters and which switch an energized state and a non-energized state of the PTC elements by being turned ON and OFF, pattern information which defines state combination patterns of the energized state and the non-energized state of the PTC elements with respect to a required power value for the heater unit, and a ratio controlling unit which when the required power for the heater unit is at an intermediate value of the required power values defined in the pattern information, controls a ratio of the energized state to the non-energized state of the PTC elements based on a ratio of ON time to OFF time for which an average power within a certain period matches the required power.

Growing community of inventors

Tokyo, Japan

Keiji Nagasaka