Abstract: An electric vehicle includes a drive-motor driving device and a compressor-driving device for air-conditioning. Both of these driving devices share a smoothing capacitor and a radiator. The drive-motor driving devices, the compressor-driving device, and the smoothing capacitor are disposed in a shielding case against electromagnetic wave, so that the electric circuit of the vehicle can be downsized and light-weighted.

Abstract: An electric compressor, a four-way valve driving unit and an outside heat exchanger fan driving unit of an automotive electric compressor driving apparatus which are located in an engine room are connected to an electric compressor driving unit disposed outside a passenger compartment of an automobile and are controlled by an air conditioner controller disposed in a passenger compartment and connected to the electric compressor driving unit by one communication cable transmitting serial signals. In addition, the detection output of an outside temperature sensor is supplied to the air conditioner controller via the electric compressor driving unit and the communication cable.

Abstract: A hermetic electric compressor includes a motor unit having a stator coil and a compressor unit driven by the motor unit for compressing refrigerant gas. A temperature sensor is provided at the stator coil for monitoring a temperature of the stator coil. A control unit is further provided to control a rotational frequency or speed of the motor unit via the stator coil depending on the monitored temperature of the stator coil. The temperature sensor and the control unit are connected via a shielded cable or a twisted pair. The shielded cable or the twisted pair may be grounded via a capacitor. Further, a thermostat may also be provided at the stator coil and connected in series to the temperature sensor.

Abstract: An apparatus for controlling a DC brush-less motor includes a switching circuit which switches a DC voltage to convert the DC voltage into first pulses and a controller which controls the switching circuit. The controller has a voltage detector which detects a voltage of second pulses induced in the windings, a duty ratio control which controls a duty ratio of the first pulse depending upon the induced voltage detected by the voltage detector, and a carrier cycle control which controls a cycle of the first pulse depending upon the duty ratio or a width of the second pulse.

Abstract: In an air heating system for use in an electric vehicle and the like, a heat-transfer fluid supply apparatus includes, a thermo-control circuit (TCCRT) having a thermo-control valve, a fluid-heating circuit (HCRT) having a high DC voltage battery for supplying a high DC voltage to an electric heater, and a switch control unit operatively associated with both the thermo-control circuit and the fluid-heating circuit, where the switch control unit includes a semiconductor device which is operative by variations in electric current flowing in the thermo-control circuit to thereby control the fluid-heating circuit by switching on and off, and wherein the fluid tank has a metallic outer case to which the semiconductor device is secured in close contact so that the heat generated at the semiconductor device due to consumption of electric power is transferred to the heat-transfer fluid stored in the fluid tank via the metallic outer case.

Abstract: In an inverter apparatus for converting a direct current to an intermittent current by a converter configured by parallel-connected plural pairs of serially-coupled switching elements, resistance loads are connected across output terminals of the converter and a positive terminal or a negative terminal of a direct current source, and a direct current output can be supplied to the resistance loads from the inverter apparatus by controlling the converter at a low frequency.

Abstract: An inventor system in which a first power supply system powers: a switching-element-group driving a motor, a charging-pump-type gate-driving-circuit, an inverter controller. A second power supply system powers an air conditioning controller outside of the inverter. An insulating communication circuit provides communication between the inverter controller and the air conditioning controller insulating these two controller. Most parts of the inverter system are powered by a single power supply system, i.e. the first power supply system, whereby electromagnetic noises are reduced, spaces involved in insulation can be saved, and the amount of wiring as well as cost is reduced.

Abstract: A drive unit for driving an electrically-operated compressor mounted in an automotive vehicle is provided with a ventilation arrangement. The ventilation arrangement includes a casing having a vent hole defined therein. A filter having an air permeability and a water repellency is mounted on the casing so as to cover the vent hole. An elongated ventilation member is mounted on the casing so as to communicate with the vent hole and extends in a direction diverting from the direction in which the casing is splashed with water. The filter may be accommodated in the elongated ventilation member.

Abstract: In a device for heating and circulating a fluid for vehicles wherein a fluid heating and delivering unit for heating and delivering a fluid, and a car room heat exchanger are annularly connected together to circulate the fluid in order to heat a car room, a bypass passage is installed in a fluid passage between the fluid heating and delivering unit and the car room heat exchanger, such that the bypass passage extends in a close vicinity to batteries to heat said batteries. The heated fluid for heating the car room is utilized to heat the batteries for driving the vehicle, so that the decrease of the battery temperature can be suppressed and the battery performance improved.

Abstract: A comparison voltage which is stepwise changed by control of a microcomputer through photocouplers is compared with a voltage of a direct-current power supply, and a signal of comparison result is given to the microcomputer through a photocoupler. The voltage of the direct-current power supply is detected on the basis of the comparison voltage when the signal of the comparison result changes.

Abstract: A drive circuit 12 for driving an electric compressor 10 is connected with a DC power source 14. Arranged between the DC power source 14 and the drive circuit 12 is a switch 16 which, when turned on, supplies an electric current therethrough the drive circuit 12. Also a capacitor 22 is connected parallel to a drive circuit 12 and a switch 16 is connected parallel to a resistance 26. When starting, the control circuit 30 activates the drive circuit 12 to drive the compressor 10. Subsequently, the control circuit 30 turns the switch 16 on so that the current is supplied from the DC power source 14 to the drive circuit 12.

Abstract: A micro computer 6 reads a manual switch signal Sm from an operating section 15, and sets a target output W0 of an electrically driven compressor 11 based on the manual switch signal Sm. A temperature sensor 20 detects a temperature Ts of a designated component in the compressor control system. Micro computer 6 judges whether the detected temperature Ts is larger than a predetermined upper limit Ta, and generates an output command W equalized to the target output W0 when the temperature Ts is within a predetermined allowable range. On the other hand, when the detected temperature Ts is higher than the upper limit Ta, micro computer 6 sets a modified output W1 smaller than target output W0 by a predetermined correction value .DELTA.W (W1=W0-.DELTA.W>0), and adjusts the output command W to the modified output W1. Then, the compressor 11 is actuated based on thus obtained output command W.

Abstract: In an inverter apparatus for air conditioner for converting DC voltage supplied from a DC power source into pseudo AC voltage of variable voltage and variable frequency by means of pulse-width modulation, a control circuit varies pulse-widths of the pseudo AC voltage in response to degree of rise/drop of the DC voltage from the nominal DC voltage; and when the voltage has an insufficient value to obtain the frequency-voltage characteristic, the control circuit controls switching devices to issue a maximum AC voltage obtained by the present DC voltage independent of frequency.

Abstract: An electric car air-conditioning apparatus, which is small in size and capable of preventing abnormal heating upon occurrence of a failure and preventing damage when a capacitor is connected with its polarity reversed, provided with a current-conduction detecting device for detecting the operation of current conduction of a current conducting device for charging the capacitor with a current from a battery, and a power breaking device for breaking a current from the battery, wherein a control section actuates the power breaking device to break the current from the battery in the case where the current-conduction detecting device detects the operation of current conduction for a period longer than a predetermined time when the control section is not outputting a control signal for closing a switching device through which power is supplied from the battery to drive a motor-driven compressor, and in the case where the current-conduction detecting device detects the operation of current conduction when the control

Abstract: An electric-vehicle air-conditioning apparatus small in size, simple in construction and high in reliability, which can be used for many types of vehicles, includes a battery, a conducting device connected in series with the battery, a switching device connected in parallel to the conducting device, a capacitor charged from the battery through the conducting device, a device supplied with power from the battery through the switching device for driving an electrically-operated air-conditioning compressor. The conducting device is adapted to charge the capacitor with a constant current.