An apparatus and method for diagnosing whether a charging and discharging switching element provided on a charging and discharging path of a battery pack operates normally. A charging and discharging switching unit having a charging and discharging switch and a fuse is installed on a charging and discharging path between a battery cell and a pack terminal. The apparatus includes a first diagnosing path a second diagnosing path, a third diagnosing path, an integrated diagnosing path having a diagnosis switching unit and a diagnosis resistor, a voltage measuring unit, and a control unit configured to turn on and off the diagnosis switching unit and determine whether the charging and discharging switching unit is operating abnormally based on the diagnosis voltage measured by the voltage measuring unit.

A switch diagnosing apparatus and method capable of effectively diagnosing a charging switch and a discharging switch provided to a battery pack. It is possible to effectively diagnose the state of a switch as at least one of a normal state, an open stuck state, a closed stuck state and a drift state, thereby improving the diagnosing efficiency.

A switch diagnosing apparatus and method capable of effectively diagnosing a charging switch and a discharging switch provided to a battery pack. It is possible to effectively diagnose the state of a switch as at least one of a normal state, an open stuck state, a closed stuck state and a drift state, thereby improving the diagnosing efficiency.

It is described an electrical installation measuring system comprising a control and measuring device configured to be installed on an electrical panel of an electrical installation and perform at least one measure of an electrical parameter of the electrical installation depending on an electrical load connected to the electrical installation and transmit command signals along a telecommunication link. The system further comprises a variable load device connectable to the electrical installation and configured to: receive the command signals from the telecommunication link; and assume a plurality of load configurations according to the command signals.

It is described an electrical installation measuring system comprising a control and measuring device configured to be installed on an electrical panel of an electrical installation and perform at least one measure of an electrical parameter of the electrical installation depending on an electrical load connected to the electrical installation and transmit command signals along a telecommunication link. The system further comprises a variable load device connectable to the electrical installation and configured to: receive the command signals from the telecommunication link; and assume a plurality of load configurations according to the command signals.

A discharge detection system of the present invention includes a current detection section configured to detect a value of current flowing in a circuit; a high pass filter configured to detect noise in a high frequency band superimposed on the circuit by a discharge phenomenon; and a determination section electrically connected to the current detection section and the high pass filter. The determination section executes steps including determining whether the discharge phenomenon has occurred based on the noise in the high frequency band detected by the high pass filter, when the discharge phenomenon is determined to have occurred, calculating an increase or decrease in the current value at the occurrence of the discharge phenomenon based on the current value detected by the current detection section, and specifying information on the discharge phenomenon based on the increase or decrease in the current value.

A switch assembly configured to determine when input received from a switch is caused by proper actuation of the switch and should be accepted, or is caused instead by a fault in the switch or in the intervening circuitry and should be ignored and/or reported. The switch assembly optionally includes a logic circuit that is electrically connected to the switch. The logic circuit may provide power to the switch, for example, as a time varying signal, which may then be presented to the logic circuit as input when the switch is properly actuated. The logic circuit may then compare the input from the switch with the signal sent to the switch to determine if a fault is present, or if the switch is operating properly.

A switching assembly configured to use different sensing technologies to detect a button press and to thereby determine when the switch is malfunctioning. The switch assembly may include an actuator that is configured to selectively open or close an electric circuit, and may also include a sensor responsive to the position of the actuator. A logic circuit may be included that is configured to compare input from the sensor with input from the circuit the switch is electrically connected to so as to determine whether the switch assembly is operating properly. The logic circuit may generate a signal indicating the operational status of the switch and may optionally provide this signal to a fault detection circuit. The actuator, sensor, and logic circuit may also be mounted within a common housing thus providing a single installation package.

Provided are a battery management system (BMS) and a battery system capable of accurately measuring a voltage without using a precise resistance element and reducing an error even when operating in a wide temperature range. Since a correction amount for the resistor included in the voltage measurement module is generated using a diagnostic power source configured independently of the battery system, and a voltage of the circuit included in the battery system is measured by applying the generated correction amount, the voltage may be precisely measured without using a high-precision resistance element. Since a changeover switch operates periodically to generate and apply an updated correction amount according to a changing environment, the voltage may be precisely measured even if it is applied to a system in which the environment continuously changes, such as a driving electric vehicle.

A battery unit includes a positive relay switch, a negative relay switch, a first resistor disposed in a third wiring portion extending between a positive external terminal and a negative external terminal, a second resistor serially connected to a portion on more negative side than the first resistor, a third resistor disposed in a second wiring portion and connected in parallel with the negative relay switch, a potential difference detection section capable of detecting a first potential difference which is a potential difference between the portion of the third wiring portion on more negative side than the first resistor and a negative terminal and a failure determination section for determining a failure of the positive relay switch and the negative relay switch respectively, based on the first potential difference.