Abstract: A battery voltage detector includes, but is not limited to: a voltage detection circuit; and a voltage processor. The voltage detection circuit includes, but is not limited to: a capacitor configured to be charged by a battery cell; a pair of output terminals; an output switch; and a voltage processor. While the capacitor is charged, the output switch is configured to be off-state and insulate the capacitor from the pair of the output terminals. After the capacitor is charged, the output switch is configured to be on-state and connect the capacitor to the pair of the output terminals. The voltage processor is configured to obtain, as a cell voltage, a voltage between the output terminals of the voltage detection circuit while the output switch is on-state. A high-potential output terminal of the pair of the output terminals is connected to a power line via a pull-up resistor.

Abstract: A battery voltage detector includes a voltage detection circuit and a voltage processor. The voltage detection circuit includes a capacitor, a pair of output terminals and an output switch. A power source voltage is supplied from a power source to a higher voltage output terminal of the pair of output terminals in the voltage detection circuit. While the output switch is turned off, the voltage processor takes in a voltage between the output terminals as a voltage for determining a defect and determines whether or not a false detection of the cell voltage has occurred based on the voltage for determining the defect.

Abstract: What is provided is a cell balance control device including: a bypass circuit including a direct circuit with a bypass resistance and a switching element, the bypass circuit being connected in parallel to each of a plurality of cells included in a battery; a cell voltage detection unit detecting a cell voltage of each of the plurality of cells; a temperature detection unit detecting a temperature of a substrate on which the bypass circuit is mounted; and a control unit controlling and computing a duty ratio of the switching element based on a value detected by the temperature detection unit and a cell voltage of a discharge-needed cell obtained by the cell voltage detection unit.

Abstract: A leak detecting circuit includes: a current path having one end connected to a conductor housing a device supplied with a direct-current voltage from a direct-current power source, and having another end connected to a negative electrode of the direct-current power source; the current path including a limiting resistance for limiting a current, a switch element having a first electrode, a second electrode, and a control electrode, conduction between the first electrode and the second electrode being controlled, a detecting resistance for detecting a current flowing through the current path, and a variable direct-current power source allowing a plurality of leak detecting reference voltages for detecting a leak to be selected, and having a negative electrode connected to the negative electrode of the direct-current power source; an amplifier for amplifying a voltage across the detecting resistance; and a constant-voltage circuit for making constant a potential difference between a voltage of the control elect

Abstract: A controlling apparatus for a motor vehicle has a high voltage direct current (dc) power supply, an inverter for converting dc power of the high voltage dc power supply into ac power, a smoothing capacitor provided between the inverter and the high voltage dc power supply, a main contactor provided between the high voltage dc power supply and the smoothing capacitor for connecting and disconnecting the high voltage dc power supply and the smoothing capacitor to and from each other, and a precharge circuit connected in parallel to the main contactor.

Abstract: A voltage between both terminals of each unit battery is amplified by a differential amplifier and is then converted by a converter into a predetermined physical quantity that corresponds to the voltage between both terminals of the unit battery. The converted physical quantity is then level-shifted by a detection circuit and is converted into a voltage on a reference potential of the lowest electric potential of the battery assembly. A control unit sequentially selects the converted voltages by a multiplexer, generates serial digital signals by an A/D conversion, and then transmits the serial digital signals to a control operation unit via an isolation buffer circuit. It is, therefore, possible to provide a battery voltage measurement circuit capable of measuring a voltage of each of unit batteries constituting a battery assembly with high accuracy by using a common measurement circuit in a relatively simple and inexpensive configuration.

Abstract: A leakage detection circuit includes a branch having a body ground, a protective resistance, a switch element, a detection resistance, and a variable power supply that are coupled in series. A low voltage side of the variable power supply is connected to a negative electrode of a power supply device that is a subject for observation. Under control of the computer, the variable power supply outputs the voltage of 0 (zero) volt for detecting the leakage on a high voltage side and the voltage of 10-odd volts for detecting the leakage on the low voltage side. A leakage current is determined by amplifying a voltage across the detection resistance. A reference potential is not the body ground but the negative electrode of the power supply device, making it possible to configure the circuit in a relatively simply by using one detection circuit with one switch element having high voltage resistance.

Abstract: A controlling apparatus for a motor vehicle has a high voltage direct current (dc) power supply, an inverter for converting dc power of the high voltage dc power supply into ac power, a smoothing capacitor provided between the inverter and the high voltage dc power supply, a main contactor provided between the high voltage dc power supply and the smoothing capacitor for connecting and disconnecting the high voltage dc power supply and the smoothing capacitor to and from each other, and a precharge circuit connected in parallel to the main contactor.

Abstract: A leak detecting circuit includes: a current path having one end connected to a conductor housing a device supplied with a direct-current voltage from a direct-current power source, and having another end connected to a negative electrode of the direct-current power source; the current path including a limiting resistance for limiting a current, a switch element having a first electrode, a second electrode, and a control electrode, conduction between the first electrode and the second electrode being controlled, a detecting resistance for detecting a current flowing through the current path, and a variable direct-current power source allowing a plurality of leak detecting reference voltages for detecting a leak to be selected, and having a negative electrode connected to the negative electrode of the direct-current power source; an amplifier for amplifying a voltage across the detecting resistance; and a constant-voltage circuit for making constant a potential difference between a voltage of the control elect

Abstract: A voltage between both terminals of each unit battery is amplified by a differential amplifier and is then converted by a converter into a predetermined physical quantity that corresponds to the voltage between both terminals of the unit battery. The converted physical quantity is then level-shifted by a detection circuit and is converted into a voltage on a reference potential of the lowest electric potential of the battery assembly. A control unit sequentially selects the converted voltages by a multiplexer, generates serial digital signals by an A/D conversion, and then transmits the serial digital signals to a control operation unit via an isolation buffer circuit. It is, therefore, possible to provide a battery voltage measurement circuit capable of measuring a voltage of each of unit batteries constituting a battery assembly with high accuracy by using a common measurement circuit in a relatively simple and inexpensive configuration.

Abstract: A leakage detection circuit of the present invention includes a branch having a body ground, a protective resistance, a switch element, a detection resistance, and a variable power supply that are coupled in series. A low voltage side of the variable power supply is connected to a negative electrode of a power supply device that is a subject for observation. A computer turns on the switch element only upon leakage detection. Under the control of the computer, the variable power supply outputs the voltage of 0 (zero) volt for detecting the leakage on a high voltage side and the voltage of 10-odd volts for detecting the leakage on the low voltage side. A leakage current or a leakage resistance is determined by amplifying a voltage between both ends of the detection resistance.

Abstract: An automatic cushioning control apparatus for a cylinder of a working machine provides a quiet cylinder cushioning effect, causing little shaking of a vehicle body, without using a mechanical cylinder cushion.

Abstract: A controlling apparatus for use in a balanced work or cargo handling system which aims at detecting the weight of the work or cargo suspended accurately even if a drift occurs in an acceleration detector due to changes in ambient temperature to thereby enable a stable work or cargo raising and lowering operation to be achieved. The controlling apparatus comprises an acceleration correcting arithmetic unit (23) adapted to output the difference between an averaged acceleration signal (Va.phi.) obtained by averaging the drifted acceleration signals (Va) transmitted by an acceleration; detector (8) during a predetermined period of time and the drifted acceleration signal (Va), as a corrected acceleration signal (Va') to a command arithmetic unit (17) and a load storage and arithmetic unit (22) when the absolute value (.vertline.Va.vertline.) of the drifted speed signal (Va) is less than a preset value (.epsilon.a) and the absolute value (.vertline.V.vertline.