Abstract: In a power supply system, when an ignition switch is turned OFF, a second switch is turned OFF to cut off supply of electric power to an leveling circuit from the 12-V battery and on the other hand, a first switch is turned ON to supply the electric power from the solar cell. When the vehicle is left unused for a long period, voltages of the respective single cells in the high voltage battery are leveled, so that voltages of the single cells forming a battery pack are leveled even when the ignition switch is OFF.

Abstract: A power supply device includes a plurality of power supply units connected in parallel, and includes a positive electrode-side junction formed by the joining of positive electrode-side terminals of the plurality of power supply units and a negative electrode-side junction formed by the joining of negative electrode-side terminals of the plurality of power supply units. Each of the plurality of power supply units includes a battery unit, and a first relay that is provided between one of the positive and negative electrode-side junctions and the battery unit and is electrically disconnectably connected in series to the battery unit. Each of the plurality of power supply units includes a resistive element of which one end is connected between the first relay, which is connected to one of a positive electrode terminal and a negative electrode terminal of the battery unit, and the battery unit.

Abstract: A battery module voltage detector can reduce the difference in frequency response of an anti-aliasing filter for each battery module whose voltage is measured, and provide an accurate voltage measurement. The battery module voltage detector includes a plurality of switches connected to battery modules constituting a battery pack, resistors having an equal resistance value, and a filter composed of capacitors having equal capacitance and being disposed between the battery modules and the switches. The capacitors are divided into a first capacitor group and a second capacitor group which are symmetrical at the center of the battery pack. The first capacitor group is on the positive terminal side of the second battery. The second capacitor is on the negative terminal side of the battery pack. Capacitors may be connected between an output terminal of a (1+M/2)-th resistor and an N-th resistor, except a (1+m/2), the (1+M/2)-th resistor and the N-th resistor.

Abstract: The present invention provides an easy to produce cell voltage detecting apparatus using a semiconductor having low voltage endurance. In the cell voltage detecting apparatus, cell modules B1-B10 are serially connected, a switch SW1 is located at a middle point, and a contact point of the switch SW1 on a higher potential side is set to a reference potential (ground). Each of discharge type constant current circuits VC1-VC10 is connected to each of the cell modules B1-B10, and each of current-voltage converter circuits CV1-CV10 is connected to each of the discharge type constant current circuits VC1-VC10. Also, diodes D6-D10 are connected respectively so as to allow a current to flow in a direction from the current-voltage converter circuits SV6-SV10 to the corresponding induction type constant current circuits VS6-VS10.

Abstract: A charging device has an electric accumulator (20) formed by a plurality of series-connected electric accumulator cells (E1, E2, . . . , En), one electrode of any one of the electric accumulator cells being used as a reference potential of the electric accumulator (20); at least one capacitor (C1) having one end fixed to the potential of one electrode of each of the electric accumulator cells (E1, E2, . . . , En) or fixed to the potential of the other electrode of any one of the electric accumulator cells (E1, E2, . . . , En) through a rectifying means (D11, D12); and a periodical power source (30) connected between the capacitor (C1) and the reference potential of the electric accumulator to generate repetitive signals.

Abstract: A power supplying apparatus for supplying power to a plurality of loads has been needed. Therefore, a power supplying apparatus for supplying power to a plurality of loads, including: a rectifying circuit connected to each of the plurality of loads; an AC circuit to sequentially connect between the rectifying circuits; and an AC generating circuit to apply AC voltage to the AC circuit, in which the AC circuit includes a capacitor and an inductor connected in series is provided.

Abstract: A battery module voltage detector can reduce the difference in frequency response of an anti-aliasing filter for each battery module whose voltage is measured, and provide an accurate voltage measurement. The battery module voltage detector includes a plurality of switches connected to battery modules constituting a battery pack, resistors having an equal resistance value, and a filter composed of capacitors having equal capacitance and being disposed between the battery modules and the switches. The capacitors are divided into a first capacitor group and a second capacitor group which are symmetrical at the center of the battery pack. The first capacitor group is on the positive terminal side of the second battery. The second capacitor is on the negative terminal side of the battery pack. Capacitors may be connected between an output terminal of a (1+M/2)-th resistor and an N-th resistor, except a (1+m/2), the (1+M/2)-th resistor and the N-th resistor.

Abstract: A voltage detecting device for battery modules can reduce the difference in frequency response of an anti-aliasing filter for each battery module whose voltage is measured, and provide an accurate voltage measurement. The voltage detecting device for battery modules includes a plurality of switches connected to battery modules constituting a secondary battery, resistors having an equal resistance value, and a filter composed of capacitors having equal capacitance and being disposed between the battery modules and the switches. The capacitors are divided into a first capacitor group and a second capacitor group which are symmetrical at the center of the secondary battery. The first capacitor group is on the positive terminal side of the second battery. The second capacitor is on the negative terminal side of the secondary battery.

Abstract: The present invention provides an easy to produce cell voltage detecting apparatus using a semiconductor having low voltage endurance. In the cell voltage detecting apparatus, cell modules B1-B10 are serially connected, a switch SW1 is located at a middle point, and a contact point of the switch SW1 on a higher potential side is set to a reference potential (ground). Each of discharge type constant current circuits VC1-VC10 is connected to each of the cell modules B1-B10, and each of current-voltage converter circuits CV1-CV10 is connected to each of the discharge type constant current circuits VC1-VC10. Also, diodes D6-D10 are connected respectively so as to allow a current to flow in a direction from the current-voltage converter circuits SV6-SV10 to the corresponding induction type constant current circuits VS6-VS10.

Abstract: A voltage monitor circuit, wherein a high voltage is not applied to a monitor circuit even if a series circuit of plural batteries connecting a battery pack is cut off, is provided. When a current breaking switch is turned off, a high series voltage with reversed polarity of plural batteries is generated across the current breaking switch. Subsequently, a solid state switch with a negative voltage is turned off. Further, as a wire on the side of a battery pack monitor circuit also has a negative voltage, another solid state switch biased by a voltage of the wire is turned off likewise. Consequently, a high voltage is not generated between the wires on the side of the battery pack monitor circuit even if the current breaking switch is turned off.

Abstract: A charging device has an electric accumulator (20) formed by a plurality of series-connected electric accumulator cells (E1, E2, . . . , En), one electrode of any one of the electric accumulator cells being used as a reference potential of the electric accumulator (20); at least one capacitor (C1) having one end fixed to the potential of one electrode of each of the electric accumulator cells (E1, E2, . . . , En) or fixed to the potential of the other electrode of any one of the electric accumulator cells (E1, E2, . . . , En) through a rectifying means (D11, D12); and a periodical power source (30) connected between the capacitor (C1) and the reference potential of the electric accumulator to generate repetitive signals.

Abstract: The object of the present invention is to provide a vehicle drive system which enables setting of appropriate start-up torque and restraining of progress of battery deterioration. A vehicle drive apparatus having an electric motor, which is driven with electricity supplied by a battery, for driving a vehicle or assisting it while driven by an engine includes: a temperature sensor for detecting the battery temperature, an discharge power upper limit setting means for setting an upper limit for discharge power of the battery depending on the battery temperature, a discharge power computing means for computing battery discharge power, a revolution speed sensor for detecting a revolution speed of the engine, a basic start-up torque setting means for setting basic start-up torque requirement depending on the revolution speed and a start-up torque adjust means for decreasing the start-up torque requirement if the discharge power exceeds the discharge power upper limit during engine start-up.

Abstract: The object of the present invention is to provide a vehicle drive system which enables setting of appropriate start-up torque and restraining of progress of battery deterioration. A vehicle drive apparatus having an electric motor, which is driven with electricity supplied by a battery, for driving a vehicle or assisting it while driven by an engine includes: a temperature sensor for detecting the battery temperature, an discharge power upper limit setting means for setting an upper limit for discharge power of the battery depending on the battery temperature, a discharge power computing means for computing battery discharge power, a revolution speed sensor for detecting a revolution speed of the engine, a basic start-up torque setting means for setting basic start-up torque requirement depending on the revolution speed and a start-up torque adjust means for decreasing the start-up torque requirement if the discharge power exceeds the discharge power upper limit during engine start-up.

Abstract: A state of charge (SOC) measuring apparatus for a battery device is provided capable of detecting accurate state of charge based on integrating charge and discharge current. The state of charge measuring apparatus carries out data substitution for displaying and controlling state of charge depending on the upper limit SOC or lower limit SOC. The integrated SOC obtained by integrating charge and discharge currents is corrected into the corrected SOC by the incremented corrected value incremented at every data substitution time. The state of charge measuring apparatus corrects the integrated SOC at every data substitution such that the difference between the integrated SOC and the corrected SOC becomes larger, and when the integrated SOC is smaller than the upper limit SOC and larger than the lower limit SOC, the corrected SOC is displayed on the display portion as the displaying and controlling SOC.

Abstract: A current detector used in a control system for controlling a motor for driving a vehicle is disclosed, which does not require an especially accurate power circuit, and an accurate measurement result can be obtained by using a cheap power circuit whose accuracy is relatively low. The current detector comprises a detector for outputting a voltage corresponding to a target current, wherein the detector has a current detecting element for detecting the target current; an amplifier for amplifying and outputting the output from the detector; an analog-digital converter for converting the output from the amplifier to a digital data; and a power circuit for supplying an output voltage to both the detector and the analog-digital converter.

Abstract: A state of charge (SOC) measuring apparatus for a battery device is provided capable of detecting accurate state of charge based on integrating charge and discharge current. The state of charge measuring apparatus carries out data substitution for displaying and controlling state of charge depending on the upper limit SOC or lower limit SOC. The integrated SOC obtained by integrating charge and discharge currents is corrected into the corrected SOC by the incremented corrected value incremented at every data substitution time. The state of charge measuring apparatus corrects the integrated SOC at every data substitution such that the difference between the integrated SOC and the corrected SOC becomes larger, and when the integrated SOC is smaller than the upper limit SOC and larger than the lower limit SOC, the corrected SOC is displayed on the display portion as the displaying and controlling SOC.

Abstract: In an electric vehicle in which a motor is driven using the electric power of a battery, and a PWM controller controls an inverter mounted between the battery and the motor. The frequency of the PWM control means is usually set higher than an audio frequency, in order to decrease the switching noise of the inverter. Motor operational state detecting devices detect when the motor is at low speed and high-load operational state, and if there is a possibility that switching elements of the inverter may be over-heated, the frequency of the PWM controller is decreased by a frequency changing device, thereby preventing damage to the switching elements of the inverter due to the over-heating.

Abstract: An AC motor controlling apparatus which can exactly control the torque of an AC motor throughout a motor rotating speed range from low to high.A control mode selecting circuit 13 actuates a switching circuit 19 for allowing an exciting circuit 12 to receive a PWM signal S11 from a current feedback circuit 11 when the rotating speed Nm of the motor 1 is in a higher range, and a PWM signal from an AND gate 14 when it is in a lower range. A power feedback circuit 10 performs a feedback control for matching the power supplied to an inverter circuit 6 to a target power. The current feedback circuit 11 performs a feedback control for matching the phase currents to a target currents.