Abstract: A switching power supply of a step-down chopper system, which is capable of reducing power consumption and unused power supply to the output. A voltage supplied to an input main terminal is turned ON/OFF by a switching device controlled by a control circuit, and outputted to an output main terminal through a conversion circuit. An output voltage detecting circuit detects the output voltage at the output main terminal, and according to the state of the output voltage detected, a feedback circuit is controlled, so that the ON/OFF control over the switching device by the control circuit is paused (or stopped). Thus, the switching device oscillates or is paused (stopped) according to the output voltage.

Abstract: A refrigerating apparatus employs a mixture of coolants and a coolant controller for controlling a ratio between the coolants to adjust refrigerating capacity during a refrigerating operation. The apparatus has a compressor whose revolution speed is controlled to provide required refrigerating capacity. When the revolution speed of the compressor decreases below a lower set value or rises above an upper set value, the coolant controller controls the ratio between the coolants.

Abstract: An air conditioner employs a refrigerating cycle in which a non-azeotropic mixture of high and low boiling coolants is sealed. The ratio between the high and low boiling coolants of the coolant mixture changes according to a change in the opening of an electric expansion valve 7. A level sensor 19 is arranged in an accumulator 17 that accumulates the liquid phase of the coolant mixture. A value detected by the level sensor is used to calculate the ratio between the high and low boiling coolants actually circulating in the refrigerating cycle. According to the opening of the valve 7 or the ratio between the actual quantities of the high and low boiling coolants, basic operation parameters such as the operation frequency of a compressor 1 are changed. This results in stabilizing and optimizing the operation of the refrigerating cycle even if a cycle temperature or pressure is changed due to a change in the ratio between the high and low boiling coolants of the coolant mixture.

Abstract: An air conditioning apparatus by which the air conditioning apparatus is controlled with optimal respondency and stability so as to enjoy indoor-space comfortability. The air conditioning apparatus for use with cycle dry, includes: an outdoor heat exchanger; a fan unit for blowing air to the outdoor heat exchanger; an adjusting portion, connected to the outdoor heat exchanger, for adjusting flow rate of refrigerant; a first indoor heat exchanger and a second heat exchanger connected to the adjusting means; a compressor which is connected both to the indoor heat exchanger and the outdoor heat exchanger, and which is controllable by an inverter unit; a detecting portion for detecting temperature and humidity indoors; and a cross control system for determining rotation frequencies of the fan unit and the inverter unit by comparing data obtained from the detecting portion with predetermined values of temperature and humidity indoors.

Abstract: A high-voltage generator employing a piezoelectric transformer has an inverter having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with the inverter; and first and second capacitors. The first capacitor is connected between the input terminal of the inverter and a ground. The second capacitor is connected between the output terminal of the inverter and the ground. The inverter, feedback resistor, and capacitors form a self-exciting oscillator to drive the piezoelectric transformer so that the piezoelectric transformer produces a high-voltage output. Since the inverter, feedback resistor, and capacitors are small, thin and light, the high-voltage generator as a whole is also small, thin and light.

Abstract: A cooling apparatus has a heat exchanger for performing heat exchange between cooling water and fluid, and a flow rate regulator valve for regulating a flow rate of either the cooling water or the fluid which pass through the heat exchanger. A cooling temperature of the fluid is preset. A temperature of the cooled fluid is detected, and an opening degree of the flow rate regulator valve is changed when there is a difference between the detected temperature and the preset temperature. Simultaneously, either a temperature difference of the cooling water and the fluid or a flow rate of the cooling water is detected. The opening degree of the flow rate regulator valve is corrected or compensated on the basis of a result of the detection, thus enabling suitable temperature control of the fluid in accordance with a variation of the temperature or flow rate of the cooling water.

Abstract: A control system for controlling cooling equipment comprising a refrigerant circuit for cooling water by heat exchange, a plurality of cooling modules in a backup relationship with an adjusting apparatus for adjusting the cooling capability of the refrigerant circuit and a controller controlling the adjusting apparatus for adjusting the cooling capability, a control module having a coolant temperature sensor and a controller for calculating a cooling capability control command based on the value detected by the coolant temperature sensor. The controller in one of the cooling modules controls the adjusting apparatus and on the cooling capability control commend transmitted from the controller in the control module.

Abstract: A water chilling apparatus comprising a plurality of chilling modules each having a refrigerating cycle mainly composed of a compressor, a condensor, an evaporator and an expansion mechanism, and a control module having a water pump for feeding, to an object to be chilled, chilling water cooled down by the evaporator of each chilling module, a detector for detecting a temperature of the chilling water and a water temperature controller. A chilling ability of each chilling module in response to a variable frequency is kept at substantially the same level. A capacity of the compressor of each chilling module is variably controlled in a range between an upper limit capacity and a lower limit capacity. The water temperature controller is used to calculate a whole necessary capacity value needed in the compressors of all the chilling modules as a function as a deviation between a set value of the chilling water temperature and a chilling water temperature detected by the detector.

Abstract: A heating portion is cooled by a fluid, thereby effecting a temperature control. The temperature of the fluid is measured at the time of starting of a system, and the measured fluid temperature is compared with a set temperature. In accordance with the result of the comparison, the timing of starting the operation of LSI chips and the timing of starting the operation of a refrigerator are controlled.

Abstract: An LSI temperature controlling system has closed LSI cooling water circuit, and a refrigeration circuit including a motor-driven refrigerant compressor, a first heat exchanger for exchanging the heat of the LSI cooling water and the refrigerant and a second heat exchanger for exchanging the heats of the refrigerant and another fluid. The motor speed is controlled by an inverter the operation of which is controlled based on the temperature of the LSI cooling water measured by a temperature detector. A heater is used to suppress dew formation on LSI substrates.

Abstract: A compressor has a motor and a compressor mechanism connected to the motor. The motor has a coil and is lubricated with lubricant. The compressor mechanism sucks and compresses low-pressure coolant and discharges high-pressure coolant. The compressor comprises a unit for preheating the lubricant, and a unit for detecting line-to-line impedance of the coil of the motor to know the quantity of a mixture of liquified coolant and the lubricant, and controlling activation of the preheating unit and of the compressor according to a result of the detection.

Abstract: An apparatus for inputting and outputtting data comprises an output section for outputting data to a data bus at a predetermined output timing; an input section for inputting the data transmitted through the data bus at a predetermined input timing; an output timing setting section releasing the reset thereof based on a first control signal and operated based on a second control signal and setting the output timing; and an input timing setting section releasing the reset thereof based on the second control signal and operated based on the first control signal and setting the input timing.

Abstract: This invention relates to a falling film evaporator which is arranged to cause a liquid film to flow downward to thereby effect heat exchange using evaporation. In a space of an evaporating compartment, a gas-liquid separator is disposed to communicate with a compressor which constitutes a part of a refrigeration cycle.

Abstract: A refrigerating apparatus has a refrigerating cycle including an electromotive compressor whose operational speed is variable in accordance with a drive frequency, and a control unit for operating the compressor at a frequency correspondent to a load so as to control the operation of the refrigerating cycle. Control of the operational frequency of the compressor by the control unit is effected on the basis of target super heat amounts of a discharged gas which is predetermined over an operational frequency range of the compressor. The target super heat amounts are set such that within a lower region of the operational frequency range, each target amount is larger than a super heat amount at which the maximum refrigeration capability is obtained at each operational frequency, so as to suppress a suction pressure of the compressor within an allowable limit for the compressor.