Abstract: An upper and lower limit detecting apparatus and method for a load suspending device of an electric chain block capable of easily and rapidly detecting reaching of the load suspending device to a lower limit without providing a lower limit reaching detection limit switch. In an electric chain block including electric motor, friction clutch, electromagnetic brake, speed reduction gear mechanism, load sheave, load chain, load suspending device, etc., the reaching of the load suspending device to the upper limit is detected by an upper-limit reaching detection limit switch, and the reaching of the load suspending device to the lower limit is detected by judging, with an electric power type overload limiter, that the power consumption of the electric motor has exceeded a predetermined value as a result of a stopper abutting against a chain guide and the friction clutch being dragged by rotational force of the electric motor.

Abstract: To achieve a size reduction by on-off controlling non-contact switching devices with a microcomputer. When a three-phase alternating-current electric motor is to be used, lead wires of the three-phase alternating-current electric motor are connected to output terminals of a control board. When a single-phase alternating-current electric motor is to be used, two supply terminals of the control board are electrically connected together through a first connecting member, and one end of the first connecting member is defined as a single-phase alternating-current power supply terminal. A second connecting member is connected to a supply terminal, and one end of the second connecting member is defined as a single-phase alternating-current power supply terminal. A main winding of the single-phase alternating-current electric motor is connected to the output terminals, and an auxiliary winding is connected to the output terminal and the second connecting member.

Abstract: To achieve a size reduction by on-off controlling non-contact switching devices with a microcomputer. When a three-phase alternating-current electric motor is to be used, lead wires of the three-phase alternating-current electric motor are connected to output terminals of a control board. When a single-phase alternating-current electric motor is to be used, two supply terminals of the control board are electrically connected together through a first connecting member, and one end of the first connecting member is defined as a single-phase alternating-current power supply terminal. A second connecting member is connected to a supply terminal, and one end of the second connecting member is defined as a single-phase alternating-current power supply terminal. A main winding of the single-phase alternating-current electric motor is connected to the output terminals, and an auxiliary winding is connected to the output terminal and the second connecting member.

Abstract: Charge efficiency of normal charge is improved without restricting an operation of a low-voltage load of an electric vehicle during the normal charge. During a charge of a high-voltage battery of a vehicle, when a determination of the normal charge is made, and when a determination that a mode switching target load is not operated is made, power saving mode transition processing is performed. Therefore, an operating mode of a DC-DC converter, which steps down a voltage at the high-voltage battery and supplies the stepped-down voltage to a low-voltage battery and a low-voltage load, is set to a power saving mode in which consumption power is reduced compared with a normal mode. When a determination that a start-up manipulation of the mode switching target load is performed is made, the operating mode of the DC-DC converter is changed to the normal mode.

Abstract: An AC/DC converter of a power conversion apparatus includes filters, a PFC circuit, a first full bridge circuit, a first transformer, and a first rectifier circuit and converts an AC voltage supplied from the outside to a DC voltage. A DC/DC converter includes filters, a second full bridge circuit, a second transformer, and a second rectifier circuit and lowers a DC voltage output from the AC/DC converter. Constituent circuits of the AC/DC converter located on the primary side of the first transformer are mounted on the upper face of a cooling chassis which cools both the converters. Constituent circuits of the AC/DC converter located on the secondary side of the first transformer and constituent circuits of the DC/DC converter are mounted on the lower face of the cooling chassis.

Abstract: A vehicle power-supply control device has a battery charger that converts an externally-supplied AC voltage into a DC voltage used to charge a vehicle high-voltage battery, a low-voltage power generator that converts the DC voltage output from the battery charger into a DC voltage used to drive a vehicle auxiliary machine, and a controller that controls the battery charger and the low-voltage power generator. The battery charger includes a power factor correction circuit that corrects a power factor of the AC voltage and a first DC/DC converter that generates a predetermined DC voltage based on an output of the power factor correction circuit. The low-voltage power generator includes a second DC/DC converter that steps down the DC voltage output from the battery charger and a synchronous rectifier that rectifies an output of the second DC/DC converter in synchronization with a switching operation of the second DC/DC converter.

Abstract: A power supply device includes: a DC power supply circuit which supplies DC power to a first battery; a smoothing capacitor connected to an output side of the DC power supply circuit; a voltage conversion circuit; a control unit which controls the voltage conversion circuit; an input voltage detection unit which detects an input voltage of the voltage conversion circuit; a switch which electrically connects or disconnects the first battery to the power supply device; and a control stopping unit which stops voltage conversion control, in a case where the input voltage is less than a first voltage reference value. In a case where the switch is switched off, after the voltage conversion control is continued for a predetermined time such that electric charges charged in the smoothing capacitor are discharged by a predetermined amount, the control stopping unit stops the voltage conversion control.

Abstract: An AC/DC converter of a power conversion apparatus includes filters, a PFC circuit, a first full bridge circuit, a first transformer, and a first rectifier circuit and converts an AC voltage supplied from the outside to a DC voltage. A DC/DC converter includes filters, a second full bridge circuit, a second transformer, and a second rectifier circuit and lowers a DC voltage output from the AC/DC converter. Constituent circuits of the AC/DC converter located on the primary side of the first transformer are mounted on the upper face of a cooling chassis which cools both the converters. Constituent circuits of the AC/DC converter located on the secondary side of the first transformer and constituent circuits of the DC/DC converter are mounted on the lower face of the cooling chassis.

Abstract: Charge efficiency of normal charge is improved without restricting an operation of a low-voltage load of an electric vehicle during the normal charge. During a charge of a high-voltage battery of a vehicle, when a determination of the normal charge is made, and when a determination that a mode switching target load is not operated is made, power saving mode transition processing is performed. Therefore, an operating mode of a DC-DC converter, which steps down a voltage at the high-voltage battery and supplies the stepped-down voltage to a low-voltage battery and a low-voltage load, is set to a power saving mode in which consumption power is reduced compared with a normal mode. When a determination that a start-up manipulation of the mode switching target load is performed is made, the operating mode of the DC-DC converter is changed to the normal mode.

Abstract: Charge efficiency of normal charge is improved without restricting an operation of a low-voltage load of an electric vehicle during the normal charge. During a charge of a high-voltage battery of a vehicle, when a determination of the normal charge is made, and when a determination that a mode switching target load is not operated is made, power saving mode transition processing is performed. Therefore, an operating mode of a DC-DC converter, which steps down a voltage at the high-voltage battery and supplies the stepped-down voltage to a low-voltage battery and a low-voltage load, is set to a power saving mode in which consumption power is reduced compared with a normal mode. When a determination that a start-up manipulation of the mode switching target load is performed is made, the operating mode of the DC-DC converter is changed to the normal mode.

Abstract: A voltage drop of an output voltage of a DC-DC converter, caused by a wiring resistance, can properly be compensated at low cost. The DC-DC converter is connected to a low-voltage battery through an ignition switch and started up by the ignition switch. A transformation unit transforms a voltage inputted from a high-voltage battery and supplies the voltage to the low-voltage battery. A control circuit calculates a wiring resistance between the transformation unit and the low-voltage battery based on the voltage inputted from the low-voltage battery through the ignition switch in connecting the ignition switch and an output voltage and an output current of the transformation unit. The control circuit corrects a command value of the output voltage of the transformation unit based on the calculated wiring resistance to control the output voltage of the transformation unit. The invention can be applied to a DC-DC converter for electric-powered vehicle.

Abstract: A power-supply control device for battery having a plurality of cells connected in series has a voltage conversion unit that steps down a voltage at the battery to supply the stepped-down voltage to a first load, a first opening and closing unit that opens and closes a supply path of first power from the battery to the voltage conversion unit and a second load, a battery control unit that detects abnormality of the battery, controls opening and closing of the first opening and closing unit, and is operated by second power supplied from the battery or third power supplied from the voltage conversion unit, the second power being lower than the first power, and a second opening and closing unit that opens and closes a supply path of the second power from the battery to the battery control unit.

Abstract: A power factor correction circuit controlling device has a power factor correction circuit that is connected to an AC power supply, and brings a waveform of an input current from the AC power supply close to a sine wave to correct a power factor by an on/off operation of a switching element, and a controller that controls an operation of the power factor correction circuit. The power factor correction circuit includes a current detection circuit that detects the input current, and a voltage detection circuit that detects the output voltage at the power factor correction circuit.

Abstract: A DC-DC converter includes a power conversion unit, a load amount detector, a charge detector that detects whether or not a battery is being charged, a switching frequency setting unit, and a switching controller. The load amount detector detects a load amount of the power conversion unit. The switching frequency setting unit sets a switching frequency of a switching element based on the load amount when the charge detector detects that the battery is not being charged, and sets the switching frequency of the switching element to a predetermined value when the charge detector detects that the battery is being charged.

Abstract: A charging device has an AC power supply input part that rectifies an AC voltage, a power factor correction part that converts a rectified voltage outputted from the AC power supply input part into a DC intermediate voltage, a power conversion part that converts the intermediate voltage outputted from the power factor correction part into a charge voltage, and supplies the charge voltage to a secondary battery, an input voltage acquisition unit that acquires the rectified voltage outputted from the AC power supply input part, an output voltage acquisition unit that acquires the charge voltage outputted from the power conversion part, and a storage part in which the rectified voltage, the charge voltage, and a target intermediate voltage correlated with the rectified voltage and charge voltage are stored.

Abstract: A system simplification can be achieved by reducing the number of sensors required to detect currents and voltages when an output current is estimated. A switching power supply device 6 includes a current transformer 12, a switching circuit 13, a rectifying circuit 15, a smoothing circuit 16, an input voltage detecting circuit 18, a control part 19, an output voltage detecting circuit 22 and a PWM signal generating part 30. The control part 19 calculates a duty rate and an average value of voltage of the secondary side voltage of the current transformer 12 detected by the input voltage detecting circuit 18 based on a waveform of the detected voltage. The control part 19 calculates an output current lo based on the calculated duty rate, the calculated average value of voltage and an output voltage Vo detected by the output voltage detecting circuit 22.

Abstract: A vehicle power-supply control device has a battery charger that converts an externally-supplied AC voltage into a DC voltage used to charge a vehicle high-voltage battery, a low-voltage power generator that converts the DC voltage output from the battery charger into a DC voltage used to drive a vehicle auxiliary machine, and a controller that controls the battery charger and the low-voltage power generator. The battery charger includes a power factor correction circuit that corrects a power factor of the AC voltage and a first DC/DC converter that generates a predetermined DC voltage based on an output of the power factor correction circuit. The low-voltage power generator includes a second DC/DC converter that steps down the DC voltage output from the battery charger and a synchronous rectifier that rectifies an output of the second DC/DC converter in synchronization with a switching operation of the second DC/DC converter.

Abstract: The DC-DC converter can calculate an input voltage without being influenced by a commutation time period of a primary-side current of a transformer. The DC-DC converter includes a transformer that has a primary and secondary winding, a switching circuit that is connected to the primary winding of the transformer to perform input voltage switching, a drive circuit that drives the switching circuit, a rectifier circuit that rectifies an AC voltage generated in the secondary winding of the transformer according to the switching operation of the switching circuit, and a controller that evaluates a value of the input voltage and performs predetermined processing based on the value of the input voltage. The controller detects a pulse signal emerging on an input side or an output side of the rectifier circuit, calculates a duty of the pulse signal, and evaluates the value of the input voltage based on the calculated duty.

Abstract: Charge efficiency of normal charge is improved without restricting an operation of a low-voltage load of an electric vehicle during the normal charge. During a charge of a high-voltage battery of a vehicle, when a determination of the normal charge is made, and when a determination that a mode switching target load is not operated is made, power saving mode transition processing is performed. Therefore, an operating mode of a DC-DC converter, which steps down a voltage at the high-voltage battery and supplies the stepped-down voltage to a low-voltage battery and a low-voltage load, is set to a power saving mode in which consumption power is reduced compared with a normal mode. When a determination that a start-up manipulation of the mode switching target load is performed is made, the operating mode of the DC-DC converter is changed to the normal mode.

Abstract: A system simplification can be achieved by reducing the number of sensors required to detect currents and voltages when an output current is estimated. a switching power supply device 6 includes a current transformer 12, a switching circuit 13, a rectifying circuit 15, a smoothing circuit 16, an input voltage detecting circuit 18, a control part 19, an output voltage detecting circuit 22 and a PWM signal generating part 30. The control part 19 calculates a duty rate and an average value of voltage of the secondary side voltage of the current transformer 12 detected by the input voltage detecting circuit 18 based on a waveform of the detected voltage. The control part 19 calculates an output current lo based on the calculated duty rate, the calculated average value of voltage and an output voltage Vo detected by the output voltage detecting circuit 22.