Abstract:
The power source apparatus is provided with a shunt resistor connected in series with batteries, and a current computation circuit that detects the voltage induced by current flow through the shunt resistor to compute battery current. The shunt resistor is provided with a pair of current flow terminals at two separated points on a metal plate connected in series with the batteries via connecting leads, and a pair of voltage detection terminals on a side of the metal plate between the pair of current flow terminals. Further, the shunt resistor has interval adjustment structures to adjust the distance (L) between attachment points where the connecting leads attach to the pair of current flow terminals. The distance (L) between lead attachment points is adjusted with the interval adjustment structures to finely adjust the voltage induced at the voltage detection terminals due to current flow between the two attachment points.
Abstract:
A power supply device includes a battery 1, positive and negative-side contactors 3A and 3B, and a controller 10. The battery 1 supplies power to a load 20. The positive-side contactor 3A is serially connected to the positive side of the battery 1. The negative-side contactor 3B is serially connected to the negative side of the battery 1. The controller 10 determines whether the load 20 connected to the output sides of the positive-side contactor 3A and the negative-side contactor 3B is in a connected or non-contact state. The controller 10 includes a voltage detecting circuit 12 that detects the capacitor voltage of a capacitor 21 connected to the output sides of the positive-side contactor 3A and the negative-side contactor 3B, and a determination circuit 13 that compares the detected voltage with a predetermined voltage and determines the connected state of the load 20.
Abstract:
The battery system has a current detection circuit 2, an amplifier 6, and a detection circuit 7 that detects the current flowing through batteries 1 from amplifier 6 output. The current detection circuit 2 is provided with a voltage source circuit 8 that supplies a test voltage to the input-side of the amplifier 6. Current detection lines 10 connect the current detection resistor 5 to the input-side of the amplifier 6, and the detection circuit 7 stores a reference voltage corresponding to the current detection lines 10 in the connected state. When the voltage source circuit 8 supplies the test voltage to the input-side of the amplifier 6, the detection circuit 7 compares the amplifier 6 output voltage with the reference voltage. The detection circuit 7 detects an open-circuit in the current detection lines 10 by the shift in voltage from the reference voltage.
Abstract:
The battery system has a current detection circuit 2, an amplifier 6, and a detection circuit 7 that detects the current flowing through batteries 1 from amplifier 6 output. The current detection circuit 2 is provided with a voltage source circuit 8 that supplies a test voltage to the input-side of the amplifier 6. Current detection lines 10 connect the current detection resistor 5 to the input-side of the amplifier 6, and the detection circuit 7 stores a reference voltage corresponding to the current detection lines 10 in the connected state. When the voltage source circuit 8 supplies the test voltage to the input-side of the amplifier 6, the detection circuit 7 compares the amplifier 6 output voltage with the reference voltage. The detection circuit 7 detects an open-circuit in the current detection lines 10 by the shift in voltage from the reference voltage.
Abstract:
A relay adhesion detecting device (10) of the invention is installed in an electric motor vehicle wherein a relay (14) is provided between a power source unit (12) comprising a plurality of secondary batteries and a load circuit including an electric motor for effecting or interrupting the supply of current from the power supply unit (12) to the load circuit. The device (10) comprises one secondary battery (12a) included among the batteries of the power source unit (12), the relay (14), an adhesion detecting circuit (16) and a CPU (31). The CPU (31) detects adhesion in the relay (14) due to melting by detecting the presence or absence of current flowing through a closed loop circuit comprising the secondary battery (12a), the relay (14) and the adhesion detecting circuit (16).
Abstract:
An electric power source for a motor vehicle is equipped with a welded state discriminator, and while a positive-side contactor and negative-side contactor are controlled to be switched off, the welded state discriminator detects a voltage of a positive-side contactor or negative-side contactor on its loading side with respect to a connecting point of a battery unit on a positive side and a battery unit on a negative side. Accordingly, when in a plus voltage where the detected voltage thus obtained is larger than a predetermined voltage, the positive-side contactor is judged to be in a welded state, and when in a minus voltage where the detected voltage is larger than the predetermined voltage, the negative-side contactor is judged to be in a welded state.
Abstract:
The current detection apparatus is provided with a current detection section (20; 30) that detects charging current and discharging current of the car driving battery (10), a level-shift circuit (40; 50) connected to the output-side of the current detection section (20; 30) that shifts the output of the current detection section (20; 30), and an A/D converter (60) connected to the output-side of the level-shift circuit (40; 50). The level-shift circuit (40; 50) shifts the current detection section (20; 30) output signal to unbalance the maximum discharging current and maximum charging current that can be detected.
Abstract:
An electric power source for a motor vehicle is so constructed and arranged that an interlock circuit detects a disconnected state of an interlock wire and turns off a contactor. The interlock circuit includes: a current output circuit outputting a detectable current via a diode to the interlock wire; a first current detection subcircuit connected via the interlock wire and the diode to the current output circuit; a second current detection subcircuit connected to a connection point operatively located between the current output circuit and the diode; and a judgment circuit. In the interlock circuit, when the detectable current is detected at the second current detection subcircuit and when the detectable current is not detected at the first current detection subcircuit, the judgment circuit judges the interlock wire to be in a disconnected state and cuts off the contactor.
Abstract:
A power source device comprises a cell unit 12 comprising a plurality of cells 12a. Connected between a positive side terminal and a negative side terminal of the cell unit 12 is a first current line 34 having two voltage dividing resistors 30, 32 interposed therebetween, and is a second current line 22 having two protection resistors 14, 16 and two detection resistors 18, 20 interposed therebetween. An intermediate point 24 of the second line 22 is grounded to a grounding 26 via an insulation resistor 28. The voltage difference between a voltage (V1, V2) detected by the detection resistors 18, 20 and a reference voltage (Vc) obtained from a point of connection 35 between the voltage dividing resistors is input to two Op-Amps 36, 38 serving as the input voltage (V1IN, V2IN). Based on the output voltage (V1OUT, V2OUT) obtained from the Op-Amps 36, 38, leakage occurrence is detected.
Abstract:
A power supply device includes a battery, positive and negative-side contactors and a controller. The battery supplies power to a load. The positive-side contactor is serially connected to the positive side of the battery, and the negative-side contactor is serially connected to the negative side of the battery. The controller determines whether the load connected to the output sides of the positive-side contactor and the negative-side contactor is in a connected or non-contact state. The controller includes a voltage detecting circuit that detects the capacitor voltage of a capacitor connected to the output sides of the positive-side contactor and the negative-side contactor, and a determination circuit that compares the detected voltage with a predetermined voltage and determines the connected state of the load.