Abstract: The car power source apparatus is provided with a driving battery having a plurality of connected batteries, battery-switches that connect the driving battery to the vehicle-side load, a control circuit that controls the battery-switches, and an auxiliary battery that supplies operating power to the control circuit power supply line. The power source apparatus is provided with a supplementary power supply circuit that supplies operating power to the control circuit power supply line from batteries in the driving battery to maintain control circuit operation in the event of an auxiliary battery voltage drop condition. In an auxiliary battery voltage drop condition, the supplementary power supply circuit supplies operating power to the control circuit power supply line and maintains control circuit operation to maintain control of the battery-switches.

Abstract: The car power source apparatus is provided with a car driving battery, a heater which heats the driving battery, a control circuit which controls power to the heater, and a temperature sensor to detect battery temperature and issue a detected temperature signal to the control circuit. The control circuit is provided with a timer which stores a warming-time to maintain the driving battery in a warmed-up condition via the heater after the car ignition switch has been turned off. During the warming-time, which is until the timer times-out with the ignition switch turned to the off state, the control circuit controls power to the heater to maintain the driving battery in a warmed-up condition.

Abstract: In the present battery apparatus for a vehicle, a temperature detecting plate 30 is fixed outside a casing 10 accommodating a plurality of secondary batteries 20. The casing 10 is provided with ventilation holes 15 for cooling the secondary batteries 20 between the secondary batteries 20 and the temperature detecting plate 30. The temperature detecting plate 30 fixes temperature sensors 50 on an insulation substrate 31. The insulation substrate 31 has air holes 33 communicated with the ventilation holes 15 of the casing 10, and a communicating portion 34 is provided between the air holes 33. The temperature sensor 50 is fixed to the communicating portion 34, and thereby the temperature sensor 50 is located so as to have access to a surface of the secondary battery 20 via the ventilation hole 15.

Abstract: A power device for an automotive vehicle includes an interlock switch 1, a crash sensor 2 for detecting an impact of an automotive vehicle, an interlock relay 3 controlled and turned ON and OFF by the interlock switch 1, and a contactor 4 for interrupting an output circuit 11 when the interlock relay 3 is turned OFF. In the power device, when the interrupting signal is outputted from the crash sensor 2, or when the interlock switch 1 is turned OFF from ON, the contactors 4 are turned OFF to interrupt the output circuit 11. Further, the power device has a switching element 6 connected to exciting coils 4a of the contactors 4 in series and is turned ON and OFF by an interrupting signal from the crash sensor 2. When the crash sensor 2 outputs the interrupting signal, the contactors 4 are turned OFF by the switching elements 6.

Abstract: The car power source apparatus is provided with a car driving battery, a heater which heats the driving battery, a control circuit which controls power to the heater, and a temperature sensor to detect battery temperature and issue a detected temperature signal to the control circuit. The control circuit is provided with a timer which stores a warming-time to maintain the driving battery in a warmed-up condition via the heater after the car ignition switch has been turned off. During the warming-time, which is until the timer times-out with the ignition switch turned to the off state, the control circuit controls power to the heater to maintain the driving battery in a warmed-up condition.

Abstract: A power device for an automotive vehicle comprises an interlock switch, a crash sensor for detecting impact of an automotive vehicle, an interlock relay controlled and turned ON and OFF by the interlock switch, and a contactor for interrupting an output circuit when the interlock relay is turned OFF. In the power device, when the interrupting signal is outputted from the crash sensor, or when the interlock switch is turned OFF from ON, the contactors are turned OFF to interrupt the output circuit. Further, the power device comprise a switching element connected to an exciting coils of the contactors in series and turned ON and OFF by an interrupting signal of the crash sensor. When the crash sensor outputs the interrupting signal, the contactors are turned OFF by the switching elements.

Abstract: A power supply is provided with a plurality of secondary batteries, a voltage detection circuit for detecting voltages of the respective secondary batteries or voltages of a plurality of battery modules each of which is a series connection of secondary batteries, and temperature sensors for detecting temperatures of secondary batteries. Each of the temperature sensors has a temperature characteristic that its electric resistance is small when the temperature of an associated secondary battery is low and increases as the temperature of the associated secondary battery increases past a setting temperature. The voltage detection circuit detects the voltages of the respective secondary batteries or the voltages of the respective battery modules as well as battery temperatures by using the temperature sensors as parts of lead wires for detection of the voltages.

Abstract: In the method for detecting a current, the current is detected by a first current sensor in a predetermined sampling period as a digital value, and is detected by a second current sensor in a period longer than the first current sensor with high accuracy as a digital value. In the method for detecting a current, the current during detecting-incapable time period, which is incapable of detecting the current during detecting timing for detecting the current during the predetermined period by the second current sensor, is complemented with the current value detected by the first current sensor.

Abstract: In the present battery apparatus for vehicle, a temperature detecting plate 30 is fixed outside a casing 10 accommodating a plurality of secondary batteries 20. The casing 10 is provided with ventilation holes 15 for cooling the secondary batteries 20 between the secondary batteries 20 and the temperature detecting plate 30. The temperature detecting plate 30 fixes temperature sensors 50 on an insulation substrate 31. The insulation substrate 31 has air holes 33 communicated with the ventilation holes 15 of the casing 10, and a communicating portion 34 is provided between the air holes 33, and the temperature sensor 50 is fixed to the communicating portion 34, whereby the temperature sensor 50 is located so as to access to the surface of the secondary battery 20 via the ventilation hole 15.

Abstract: In the method for detecting a current, the current is detected by a first current sensor in a predetermined sampling period as a digital value, and is detected by a second current sensor in a period longer than the first current sensor with high accuracy as a digital value.

Abstract: A power supply is provided with a plurality of secondary batteries, a voltage detection circuit for detecting voltages of the respective secondary batteries or voltages of a plurality of battery modules each of which is a series connection of secondary batteries, and temperature sensors for detecting temperatures of secondary batteries. Each of the temperature sensors has a temperature characteristic that its electric resistance is small when the temperature of an associated secondary battery is low and increases as the temperature of the associated secondary battery increases past a setting temperature. The voltage detection circuit detects the voltages of the respective secondary batteries or the voltages of the respective battery modules as well as battery temperatures by using the temperature sensors as parts of lead wires for detection of the voltages.

Abstract: A power inverter for use in the system interconnection of a direct-current supply with a commercial alternating-current supply includes an inverter circuit and a filter circuit. Feedback signals affecting the frequency of an output to be produced by the inverter circuit are taken from the filter circuit having frequency response characteristics such that the phase angle is reduced to 0.degree. at three frequencies consisting of a higher frequency, lower frequency and commercial frequency, the last of which lies halfway between the first and second. Under the normal condition, the frequency of the output produced by the inverter circuit is equal to the commercial frequency. In the event of a power failure or power cut in the commercial alternating-current supply system, deviation from the commercial frequency is caused by the characteristics of the filter circuit.