A condition monitoring device for a wind turbine power generating apparatus provided with an auxiliary motor power supply system including a power-supply-side line connected to a power supply and a plurality of auxiliary-motor-side lines diverging from the power-supply-side line and connected to a plurality of auxiliary motors, respectively, comprises: a current measurement device for measuring a current flowing through the power-supply-side line; and a control device for controlling the plurality of auxiliary motors. The control device is configured to, when a generator of the wind turbine power generating apparatus is in a standby state where power generation is stopped at a low wind speed, execute a single sequential operation mode in which each of the plurality of auxiliary motors is singly and sequentially operated. The current measurement device is configured to measure a current flowing through the power-supply-side line during execution of the single sequential operation mode by the control device.

A condition monitoring device for a wind turbine power generating apparatus provided with an auxiliary motor power supply system including a power-supply-side line connected to a power supply and a plurality of auxiliary-motor-side lines diverging from the power-supply-side line and connected to a plurality of auxiliary motors, respectively, comprises: a current measurement device for measuring a current flowing through the power-supply-side line; and a control device for controlling the plurality of auxiliary motors. The control device is configured to, when a generator of the wind turbine power generating apparatus is in a standby state where power generation is stopped at a low wind speed, execute a single sequential operation mode in which each of the plurality of auxiliary motors is singly and sequentially operated. The current measurement device is configured to measure a current flowing through the power-supply-side line during execution of the single sequential operation mode by the control device.

A battery system includes: a battery pack including a plurality of battery cells; and a battery management system for setting numbers to the battery cells by measuring cell voltages of the respective battery cells at a wake-up time, detecting a maximum cell voltage and a minimum cell voltage by periodically measuring the cell voltage of the respective battery cells after the wake-up, comparing the minimum cell voltage and the cell voltage of at least one first diagnosis target battery cell, comparing the maximum cell voltage and the cell voltage of at least one second diagnosis target battery cell, and diagnosing whether the diagnosis target battery cell is abnormal according to results of the comparison.

A battery system includes: a battery pack including a plurality of battery cells; and a battery management system for setting numbers to the battery cells by measuring cell voltages of the respective battery cells at a wake-up time, detecting a maximum cell voltage and a minimum cell voltage by periodically measuring the cell voltage of the respective battery cells after the wake-up, comparing the minimum cell voltage and the cell voltage of at least one first diagnosis target battery cell, comparing the maximum cell voltage and the cell voltage of at least one second diagnosis target battery cell, and diagnosing whether the diagnosis target battery cell is abnormal according to results of the comparison.

Accurate operation of a current monitor is provided by injecting a bias voltage to a maintain de-selected sense amplifier input in an active state. An electronic system includes an output stage to supply a load current and includes two push-pull output drivers having sense resistors supplying a first and a second sense voltage. An included mode control circuit selects between a first and a second operating mode and selects a polarity of the current. An included current monitor receives the sense voltages and has a control input coupled to the mode selection control circuit. The current monitor provides an output that is dependent on both sense voltages in the first operating mode and is indicative of one of the sense voltages selected according to the selected polarity in the second operating mode. The bias voltage is injected into an unselected sense inputs to maintain active operation of the sense amplifier.

Accurate operation of a current monitor is provided by injecting a bias voltage to a maintain de-selected sense amplifier input in an active state. An electronic system includes an output stage to supply a load current and includes two push-pull output drivers having sense resistors supplying a first and a second sense voltage. An included mode control circuit selects between a first and a second operating mode and selects a polarity of the current. An included current monitor receives the sense voltages and has a control input coupled to the mode selection control circuit. The current monitor provides an output that is dependent on both sense voltages in the first operating mode and is indicative of one of the sense voltages selected according to the selected polarity in the second operating mode. The bias voltage is injected into an unselected sense inputs to maintain active operation of the sense amplifier.

A battery management apparatus according to the present disclosure includes a voltage measurement circuit to measure a cell voltage of each of a plurality of battery cells; and a control unit to determine the cell voltage of each of the plurality of battery cells and a reference voltage of the plurality of battery cells at a preset time interval during a rest period. The control unit determines a first accumulated change of the cell voltage of each battery cell during the rest period. The control unit determines a second accumulated change of the reference voltage during the rest period. The control unit determines whether each battery cell is defective by comparing the first accumulated change of each battery cell with the second accumulated change.

A battery management apparatus according to the present disclosure includes a voltage measurement circuit to measure a cell voltage of each of a plurality of battery cells; and a control unit to determine the cell voltage of each of the plurality of battery cells and a reference voltage of the plurality of battery cells at a preset time interval during a rest period. The control unit determines a first accumulated change of the cell voltage of each battery cell during the rest period. The control unit determines a second accumulated change of the reference voltage during the rest period. The control unit determines whether each battery cell is defective by comparing the first accumulated change of each battery cell with the second accumulated change.

A fast charging method for an electronic device is disclosed. The method includes obtaining, when the electronic device has a successful communication handshake with a USB host device using the USB interface, a corresponding charging data set of the electronic device under the charging current threshold by means of measurement according to a preset charging current threshold. The charging current threshold includes at least a first charging current threshold and a second charging current threshold. The charging data set includes at least a corresponding first charging voltage value and a corresponding first charging current value of the electronic device under the first charging current threshold, and a corresponding second charging voltage value and a corresponding second charging current value of the electronic device under the second charging current threshold. The method further includes determining, according to the charging data set, a maximum charging current value.

A fast charging method for an electronic device is disclosed. The method includes obtaining, when the electronic device has a successful communication handshake with a USB host device using the USB interface, a corresponding charging data set of the electronic device under the charging current threshold by means of measurement according to a preset charging current threshold. The charging current threshold includes at least a first charging current threshold and a second charging current threshold. The charging data set includes at least a corresponding first charging voltage value and a corresponding first charging current value of the electronic device under the first charging current threshold, and a corresponding second charging voltage value and a corresponding second charging current value of the electronic device under the second charging current threshold. The method further includes determining, according to the charging data set, a maximum charging current value.