Abstract: An apparatus for online measurement of a battery internal resistance and a measurement method thereof are disclosed and applicable to online measure the internal resistance of a monomer cell in the battery, which include an excitation source circuit, electrically connected between any two monomer cells to be detected and a battery end and forming a loop respectively or simultaneously with the two monomer cells; an analog-to-digital conversion unit, for detecting and converting a response voltage of the monomer cell ends, and simultaneously electrically connected to the loop formed with the two monomer cells, for detecting and converting a current in the loop as well as detecting and converting a phase value between the current and the response voltage; a digital signal processing unit, electrically connected to the analog-to-digital conversion unit, for calculating the internal resistance value of the monomer cell to be detected after receiving a conversion signal from the analog-to-digital conversion unit; a

Abstract: The present invention provides a parallel current-sharing device and control method without a current-sharing bus, for implementing parallel current sharing of direct-current outputs of a plurality of power conversion submodules. The parallel current-sharing device comprises a voltage control module and a plurality of power conversion submodules. The voltage control module and the plurality of power conversion submodules having parallel outputs form an outer voltage loop. The power conversion submodules comprise respective inner current loops and sample respective current feedback signals to generate inner current loop control signals, and the inner current loop control signals are superposed with an outer voltage loop control signal to control output of the power conversion submodules. An independent current bus is not required, and only one unidirectional outer control voltage loop is required.

Abstract: The present invention provides a parallel current-sharing device and control method without a current-sharing bus, for implementing parallel current sharing of direct-current outputs of a plurality of power conversion submodules. The parallel current-sharing device comprises a voltage control module and a plurality of power conversion submodules. The voltage control module and the plurality of power conversion submodules having parallel outputs form an outer voltage loop. The power conversion submodules comprise respective inner current loops and sample respective current feedback signals to generate inner current loop control signals, and the inner current loop control signals are superposed with an outer voltage loop control signal to control output of the power conversion submodules. An independent current bus is not required, and only one unidirectional outer control voltage loop is required.