Abstract: A failure detecting apparatus detects a failure of a capacitor part provided on a communication path. The capacitor part is configured of a plurality of capacitors connected in series so as to cutoff DC current. Also, the failure detecting apparatus is provided with a signal input part that receives a predetermined detection signal from a transmission apparatus via the communication path and a detection part that detects a short-circuit failure of any of the capacitors that constitute the capacitor part based on the detection signal received by the signal input part.

Abstract: A voltage detection apparatus includes a capacitor and first and second differential voltage detection circuits. A reference voltage supplying unit supplies a first reference voltage from a first output terminal to the first differential voltage detection circuit, and supplies a second reference voltage from a second output terminal to the second differential voltage detection circuit. A fault determining unit determines a fault in the first or second differential voltage detection circuit based on a first voltage that is inputted from a first input terminal and a second voltage that is inputted from the second input terminal. A voltage output circuit is supplied a third reference voltage from a third output terminal between the first output terminal and the second output terminal, and outputs a third voltage to a third input terminal between the first input terminal and the second input terminal.

Abstract: A battery monitoring device includes: an oscillator causing an AC signal to flow in the battery cell; a subtractor acquiring voltage fluctuation of the battery cell when the AC signal flows as a response signal; and a calculation unit calculating complex impedance. The calculation unit calculates the complex impedance based on a multiplication value X of the response signal and a first reference signal outputted in synchronization with the AC signal, and a multiplication value Y of the response signal and the second reference signal obtained by shifting the phase of the AC signal. The AC signal is a rectangular wave signal, the first reference signal is a rectangular wave signal outputted in synchronization with the AC signal, and the second reference signal is a rectangular wave signal, the phase of which is shifted so as not to be outputted overlapping with the first reference signal.

Abstract: An insulation resistance measuring apparatus designed to calculate a complex impedance of an ac circuit including a measuring resistor, a coupling capacitor, an insulation resistor installed in a vehicle, and a ground capacitance. The insulation resistance measuring apparatus includes a sine wave current applying device which applies an ac signal to the measuring resistor and measures a voltage change appearing at a junction of the sine wave current applying device and the measuring resistor. The ac signal and the voltage change are used to determine the complex impedance. A resistance value of the insulation resistor is calculated as a function of the complex impedance. This structure enables the circuit to be reduced in size.

Abstract: An electrical leakage determination device includes: a capacitor connected to a battery; a detection resistor connected to the capacitor; a detection unit detecting a voltage value at a connection point between the detection resistor and the capacitor; a low amplitude voltage application unit applying a low amplitude voltage to the detection resistor every driving cycle; a high amplitude voltage application unit applying, before the application of the low amplitude voltage to the detection resistor, a high amplitude voltage to the detection resistor. The device determines whether there is electrical leakage between the power supply circuit and the ground based on a peak value of the voltage value detected when the low amplitude voltage is being applied, and changes a time integral value of the high amplitude voltage applied to the detection resistor based on a change in the voltage value detected when the low amplitude voltage is being applied.

Abstract: A voltage detection apparatus includes a capacitor and first and second differential voltage detection circuits. A reference voltage supplying unit supplies a first reference voltage from a first output terminal to the first differential voltage detection circuit, and supplies a second reference voltage from a second output terminal to the second differential voltage detection circuit. A fault determining unit determines a fault in the first or second differential voltage detection circuit based on a first voltage that is inputted from a first input terminal and a second voltage that is inputted from the second input terminal. A voltage output circuit is supplied a third reference voltage from a third output terminal between the first output terminal and the second output terminal, and outputs a third voltage to a third input terminal between the first input terminal and the second input terminal.

Abstract: Provided is a power source system including: a storage battery; a control unit operating by being supplied with power from the storage battery and monitoring the storage battery; a first switch configured as a latch type switch disposed on a first electrical path between the storage battery and the control unit; and a second switch configured as a latch type switch disposed on a second electrical path between the storage battery and an electrical equipment as an object to which the storage battery supplies power. The first switch and the second switch are connected in parallel to the control unit; current is supplied to the control unit from the storage battery; and the control unit includes a switch control unit configured to stop a current supply to the control unit from the storage battery.

Abstract: An insulation resistance measuring apparatus designed to calculate a complex impedance of an ac circuit including a measuring resistor, a coupling capacitor, an insulation resistor installed in a vehicle, and a ground capacitance. The insulation resistance measuring apparatus includes a sine wave current applying device which applies an ac signal to the measuring resistor and measures a voltage change appearing at a junction of the sine wave current applying device and the measuring resistor. The ac signal and the voltage change are used to determine the complex impedance. A resistance value of the insulation resistor is calculated as a function of the complex impedance. This structure enables the circuit to be reduced in size.

Abstract: A battery monitoring device includes: an oscillator causing an AC signal to flow in the battery cell; a subtractor acquiring voltage fluctuation of the battery cell when the AC signal flows as a response signal; and a calculation unit calculating complex impedance. The calculation unit calculates the complex impedance based on a multiplication value X of the response signal and a first reference signal outputted in synchronization with the AC signal, and a multiplication value Y of the response signal and the second reference signal obtained by shifting the phase of the AC signal. The AC signal is a rectangular wave signal, the first reference signal is a rectangular wave signal outputted in synchronization with the AC signal, and the second reference signal is a rectangular wave signal, the phase of which is shifted so as not to be outputted overlapping with the first reference signal.

Abstract: In a voltage monitoring apparatus, a capacitor circuit includes at least one capacitor. Input-side switches are connected to electrode terminals of at least one battery cell, and apply voltage to terminals of the capacitor. A voltage detection circuit includes a pair of voltage sensing terminals connected to terminals of the capacitor, and detects the potential difference across voltage sensing terminals. Output-side switches are connected to terminals of the capacitor, and apply voltage across terminals of the capacitor to the voltage sensing terminals. An impedance circuit is connected to the voltage sensing terminals. A stabilizing power circuit is connected to the voltage sensing terminals via the impedance circuit, and stabilizes voltage of the voltage sensing terminals. Based on the detected voltage when one of the output-side switches is turned on, an on-failure of the remaining output-side switches which should not be turned on are detected by a control unit.

Abstract: A ground-fault determination apparatus, which is for use in a vehicle power supply system including a DC power source and a DC supply circuit, includes an acquisition unit that applies an AC signal to the DC supply circuit through a series connection of a resistor and a capacitor to acquire a peak value of the AC signal divided by a resistance of the resistor and an insulation resistance of the DC supply circuit, a ground-fault determination unit that determines presence of a ground-fault based on a comparison between a determination threshold and the peak value, an estimation unit that estimates at least one of a maximum output voltage of the DC supply circuit and a common capacitance between the DC supply circuit and a vehicle body, and a setting unit that sets the determination threshold based on at least one of the maximum output voltage and the common capacitance.

Abstract: An equalization device for equalizing voltages of battery cells connected in series includes equalization switches, resistors, and a control circuit. Each equalization switch has energization terminals interposed between terminals of a corresponding battery cell. A current path between the energization terminals conducts when a control voltage not less than a threshold voltage is applied between control terminals of the equalization switch. Each resistor is connected between the control terminals of the corresponding equalization switch. The control circuit switches an equalization execution state and an equalization stop state in accordance with an equalization signal provided for each battery cell. In the execution state, the control circuit passes an electric current through the corresponding resistor to generate the control voltage not less than the threshold voltage. In the stop state, the control circuit causes the corresponding resistor to generate the control voltage less than the threshold voltage.

Abstract: In an apparatus, an input switch circuit selectively connects one of unit batteries to a capacitor. A first group of at least one unit battery has a first polarity when being connected to the capacitor. A second group of at least one unit battery has a second polarity when being connected to the capacitor. A voltage converter converts a voltage of a unit battery selectively connected to the capacitor into a value within a voltage range manipulatable by a voltage monitor. A reference voltage setter variably sets a reference voltage according to one of the first polarity and the second polarity of the voltage of a unit battery selectively connected to the capacitor. The reference voltage is used as a reference to match a scale of the voltage of a unit cell selectively connected to the capacitor for each of the first and second polarities with the predetermined voltage range.

Abstract: A battery monitoring apparatus includes wire sections each connected to a node of corresponding adjacent two of the unit cells of a battery pack at one end thereof, and branched into a first branch section and a second branch section at another end thereof. Each of the first and second branch sections is constituted of a positive part connected to a positive electrode of the corresponding unit cell and a negative part connected to a negative electrode of the corresponding unit cell. The battery monitoring apparatus includes an equalizing switch provided between each of the first wire pairs, and a voltage detector to detect a voltage between each first wire pair, and an equalizing section which performs an equalizing process to equalize a terminal voltage of each unit cell by turning on the corresponding equalizing switch depending on a result of voltage detection by the voltage detector.

Abstract: Mounting and connector structure for an electronic apparatus includes a substrate, a mounting connector mounted on a substrate surface of the substrate, and a mating connector is attached/detached to the mounting connector in a direction perpendicular to the substrate surface, and a casing having a first casing member disposed on a connector mounting surface of the substrate and a second casing member disposed on an opposite surface side of the connector mounting surface, and the casing accommodates the substrate and the mounting connector in an accommodation space which is formed by coupling the casing members to one another. The first casing member is in contact with a first surface that is a side where the mating connector is attached/detached in the mounting connector, and the second casing member is in contact with a second surface that is a side facing to the first surface in the mounting connector.

Abstract: A ground-fault determination apparatus, which is for use in a vehicle power supply system including a DC power source and a DC supply circuit, includes an acquisition unit that applies an AC signal to the DC supply circuit through a series connection of a resistor and a capacitor to acquire a peak value of the AC signal divided by a resistance of the resistor and an insulation resistance of the DC supply circuit, a ground-fault determination unit that determines presence of a ground-fault based on a comparison between a determination threshold and the peak value, an estimation unit that estimates at least one of a maximum output voltage of the DC supply circuit and a common capacitance between the DC supply circuit and a vehicle body, and a setting unit that sets the determination threshold based on at least one of the maximum output voltage and the common capacitance.

Abstract: Mounting and connector structure for an electronic apparatus includes a substrate, a mounting connector mounted on a substrate surface of the substrate, and a mating connector is attached/detached to the mounting connector in a direction perpendicular to the substrate surface, and a casing having a first casing member disposed on a connector mounting surface of the substrate and a second casing member disposed on an opposite surface side of the connector mounting surface, and the casing accommodates the substrate and the mounting connector in an accommodation space which is formed by coupling the casing members to one another. The first casing member is in contact with a first surface that is a side where the mating connector is attached/detached in the mounting connector, and the second casing member is in contact with a second surface that is a side facing to the first surface in the mounting connector.

Abstract: In a voltage detection apparatus for a battery pack, a pair of electric paths are respectively connected to a pair of ends of a unit battery defined as one of battery cells configuring a respective cell group or one of serial connections of the battery cells. A voltage detecting unit detects voltage across terminals of the unit battery via the electric paths. An electrically conductive member connects: a positive terminal of one of two adjacent cell groups and a negative terminal of the other of the two adjacent cell groups. A bypass connects one of the electric paths connected to one of both ends of the conductive member; and the other of the pair connected to the other of the both ends. A bypassing unit disposed in the bypass allows current to flow in the bypass when voltage across both terminals of the conductive member has exceeded a specified voltage.

Abstract: In an apparatus, an input switch circuit selectively connects one of unit batteries to a capacitor. A first group of at least one unit battery has a first polarity when being connected to the capacitor. A second group of at least one unit battery has a second polarity when being connected to the capacitor. A voltage converter converts a voltage of a unit battery selectively connected to the capacitor into a value within a voltage range manipulatable by a voltage monitor. A reference voltage setter variably sets a reference voltage according to one of the first polarity and the second polarity of the voltage of a unit battery selectively connected to the capacitor. The reference voltage is used as a reference to match a scale of the voltage of a unit cell selectively connected to the capacitor for each of the first and second polarities with the predetermined voltage range.

Abstract: A battery monitoring apparatus includes wire sections each connected to a node of corresponding adjacent two of the unit cells of a battery pack at one end thereof, and branched into a first branch section and a second branch section at another end thereof. Each of the first and second branch sections is constituted of a positive part connected to a positive electrode of the corresponding unit cell and a negative part connected to a negative electrode of the corresponding unit cell. The battery monitoring apparatus includes an equalizing switch provided between each of the first wire pairs, and a voltage detector to detect a voltage between each first wire pair, and an equalizing section which performs an equalizing process to equalize a terminal voltage of each unit cell by turning on the corresponding equalizing switch depending on a result of voltage detection by the voltage detector.