Abstract: A compressor driving device includes: a controller that PWM drives a compressor; an inverter circuit unit that supplies power to an electric motor included in the compressor; a drive circuit that drives the inverter circuit unit according to a control signal; a voltage detector that detects a voltage that is output to the electric motor; and a current detector that detects a current that is output to the electric motor. When a product of a detection value of the voltage detector and a detection value of the current detector is greater than a predetermined comparison value, a duty ratio of the control signal is reduced to cause the input power supplied to the electric motor by the inverter circuit unit to have a predetermined input power level or less.

Abstract: A simple inverter-controlled refrigerator includes temperature detector (17), constant speed main body control unit (12) whose power is turned on/off by temperature detector (17), and that can drive a constant speed compressor, inverter control unit (14) that is connected to constant speed main body control unit (12), and that is operated, based on a power on/off signal of constant speed main body control unit (12). And variable speed compressor (8) that is connected to inverter control unit (14), and that is controlled, based on an output from inverter control unit (14). Inverter control unit (14) has rotation speed setting unit (23) which is operated, based on the power on/off signal of constant speed main body control unit (12), and which is configured to set a rotation speed of variable speed compressor (8), and inverter drive circuit unit (24) which drives variable speed compressor (8) at the rotation speed set by rotation speed setting unit (23).

Abstract: A compressor driving device includes: a controller (23) that PWM drives a compressor; an inverter circuit unit (4) that supplies power to an electric motor included in the compressor; a drive circuit (5) that drives the inverter circuit unit (4) according to a control signal; a voltage detector (9) that detects a voltage that is output to the electric motor; and a current detector (10) that detects a current that is output to the electric motor. When a product of a detection value of the voltage detector (9) and a detection value of the current detector (10) is greater than a predetermined comparison value, a duty ratio of the control signal is reduced to cause the input power supplied to the electric motor by the inverter circuit unit (4) to have a predetermined input power level or less.

Abstract: A simple inverter-controlled refrigerator includes temperature detector (17), constant speed main body control unit (12) whose power is turned on/off by temperature detector (17), and that can drive a constant speed compressor, inverter control unit (14) that is connected to constant speed main body control unit (12), and that is operated, based on a power on/off signal of constant speed main body control unit (12). And variable speed compressor (8) that is connected to inverter control unit (14), and that is controlled, based on an output from inverter control unit (14). Inverter control unit (14) has rotation speed setting unit (23) which is operated, based on the power on/off signal of constant speed main body control unit (12), and which is configured to set a rotation speed of variable speed compressor (8), and inverter drive circuit unit (24) which drives variable speed compressor (8) at the rotation speed set by rotation speed setting unit (23).

Abstract: A control device (100) of an electric sealed compressor of the present invention comprises a power converter (30) which supplies electric power to an electric motor (5) of the electric sealed compressor; a driving circuit (27) which drives the power converter (30); abnormality detector (40) which detects abnormality in an abnormality detection region including the power converter (30) and the driving circuit (27); a controller (11) configured to output a control signal for driving the power converter to the driving circuit (27) and stop outputting the control signal in response to a signal (Fo signal) output from the abnormality detector (40), the signal indicating that the abnormality has been detected; and an auxiliary protection circuit (50) configured to deactivate the driving circuit (27) in response to the signal output from the abnormality detector (40), the signal indicating that the abnormality has been detected.

Abstract: A control device (100) of an electric sealed compressor of the present invention comprises a power converter (30) which supplies electric power to an electric motor (5) of the electric sealed compressor; a driving circuit (27) which drives the power converter (30); abnormality detector (40) which detects abnormality in an abnormality detection region including the power converter (30) and the driving circuit (27); a controller (11) configured to output a control signal for driving the power converter to the driving circuit (27) and stop outputting the control signal in response to a signal (Fo signal) output from the abnormality detector (40), the signal indicating that the abnormality has been detected; and an auxiliary protection circuit (50) configured to deactivate the driving circuit (27) in response to the signal output from the abnormality detector (40), the signal indicating that the abnormality has been detected.

Abstract: Including a storage box for accommodating a printed circuit board having a heat sink, an aluminum plate for closing an opening part of the storage box, and a rubber bush for supporting the printed circuit board from an opposite side of the opening part, the heat sink and the aluminum plate are brought to contact with each other by way of the insulating sheet, so that the heat of the heat sink may be transmitted to the aluminum plate, and released.

Abstract: An electronic circuit device includes a printed circuit board, a semiconductor element, a housing, multiple rubber bushings for underpinning the printed circuit board in a vertical direction, an aluminum plate placed vertically above the printed circuit board, and an insulating sheet. Mounting of the aluminum plate to the housing causes the printed circuit board to compress the rubber bushings, and bring the semiconductor element, the aluminum plate and the insulating sheet into pressed contact with one another.

Abstract: Including a storage box for accommodating a printed circuit board having a heat sink, an aluminum plate for closing an opening part of the storage box, and a rubber bush for supporting the printed circuit board from an opposite side of the opening part, the heat sink and the aluminum plate are brought to contact with each other by way of the insulating sheet, so that the heat of the heat sink may be transmitted to the aluminum plate, and released.

Abstract: An electronic circuit apparatus for a compressor includes a board and a case. One corner of the board is fixed to case such that the board cannot move in the thickness direction and is movable in the flattening direction. According to this structure, even when an electronic part generates heat or outside air temperature of the case varies, the expansion or contraction of the board in the flattening direction is not affected by the expansion or contraction of the case in the flattening direction. Therefore, it is possible to prevent the deformation of the board and stress from being repeatedly applied to a soldering portion of the electronic part. As a result, it is possible to ensure the reliability of soldering strength for a long time.

Abstract: An electronic circuit device includes a sub-board disposed upright on a main board. The sub-board is electrically coupled to the main board via a board terminal) disposed at sub-board edge. A semiconductor element is mounted on the sub-board facing the sub-board in parallel. A temperature sensor is also mounted on the sub-board. A heat sink is formed so as to surround the sub-board and the semiconductor element. A resin material is injected inside a heat sink so as to cover the sub-board, the temperature sensor, and the semiconductor element.

Abstract: An electronic circuit apparatus for a compressor includes a board and a case. One corner of the board is fixed to case such that the board cannot move in the thickness direction and is movable in the flattening direction. According to this structure, even when an electronic part generates heat or outside air temperature of the case varies, the expansion or contraction of the board in the flattening direction is not affected by the expansion or contraction of the case in the flattening direction. Therefore, it is possible to prevent the deformation of the board and stress from being repeatedly applied to a soldering portion of the electronic part. As a result, it is possible to ensure the reliability of soldering strength for a long time.

Abstract: An inverter circuit includes a temperature measuring section for measuring a temperature of switching elements forming a powering section, a motor speed detector for detecting a speed of a motor, a carrier frequency determiner for determining a carrier frequency based on a temperature of the switching elements and a speed of the motor, and an output waveform determining circuit for determining a duty in response to a load applied to the motor and for switching a carrier frequency.

Abstract: An electronic circuit device includes a sub-board disposed upright on a main board. The sub-board is electrically coupled to the main board via a board terminal) disposed at sub-board edge. A semiconductor element is mounted on the sub-board facing the sub-board in parallel. A temperature sensor is also mounted on the sub-board. A heat sink is formed so as to surround the sub-board and the semiconductor element. A resin material is injected inside a heat sink so as to cover the sub-board, the temperature sensor, and the semiconductor element.

Abstract: An inverter circuit includes a temperature measuring section for measuring a temperature of switching elements forming a powering section, a motor speed detector for detecting a speed of a motor, a carrier frequency determiner for determining a carrier frequency based on a temperature of the switching elements and a speed of the motor, and an output waveform determining circuit for determining a duty in response to a load applied to the motor and for switching a carrier frequency.

Abstract: Air traps 37a, 37b are disposed on one side adjacent at least one of suction and discharge ports of circulating pumps 14a, 14b forming a heat radiating or heat absorbing cycle. Also, the circulating pumps 14a, 14b are disposed at a level higher than heat-radiating and cooling heat exchangers 10, 20 and first and second heat exchanging portions 26a, 26b to recover air bubbles mixed therein so that the air bubbles circulated can be reduced to improve the heat efficiency.