Electronics and Telecommunications Research Institute

Sewan Heo

Yil Suk Yang

Wan Ki Park

Jimin Oh

Jung Hee Suk

Minki Kim

Jong Kee Kwon

Jinsoo Han

Tai-yeon Ku

Jong-Kee Kwon

Sang Gi Kim

Jongdae Kim

MinKi Kim

A power supply apparatus according to an example embodiment includes an abnormal state determiner configured to determine a maximum output of a fuel cell by determining whether there is an abnormality in the fuel cell, a fuel cell controller configured to control output power of the fuel cell within the maximum output based on demand power of a load, an energy storage configured to charge with power by receiving the power from the fuel cell and supply the power to the load, a charging state determiner configured to determine a charging state of the energy storage based on a charging amount of the energy storage, and a storage controller configured to control charging and discharging of the energy storage based on a difference between the demand power of the load and the output power of the fuel cell.

Apparatus and method for power supply using cooperation of fuel cell and energy storage

Provided is a capacity design method and apparatus for performing solar power generation of a residential complex that may calculate a capacity of a solar power generator and an energy storage device to achieve energy independence of a residential complex including a plurality of housings and reduce burden affecting a grid.

Capacity design method and apparatus for performing solar power generation of residential complex

An output controlling apparatus of an energy storage apparatus for a reliability of an output of a photovoltaic power generation is provided. The output controlling apparatus includes a power generation amount predictor configured to predict a next day's power generation amount of a photovoltaic power generator, a target output generator configured to determine a target output based on a charging state of an energy storage apparatus used for a photovoltaic power generation, a real-time output criterion generator configured to generate an output criterion used for outputs from the photovoltaic power generator and the energy storage apparatus to a system in units of time based on the target output and the charging state of the energy storage apparatus, and a charging/discharging controller configured to control charging and discharging of the energy storage apparatus such that an output to the system follows the output criterion.

Apparatus and method for controlling output of energy storage apparatus for reliability of output of photovoltaic power generation

An uninterruptible power supply apparatus and method. The uninterruptible power supply apparatus includes a first generator, an energy storage, a first power converter connected to the energy storage, a second power converter connected to the energy storage, a first switch connected to the first power converter and a first load, a second switch connected to the second power converter, the first generator and a second load, and a third switch connected to a power grid, the first generator, the second power converter, the first switch and the second switch. In a normal state in which the first switch and the third switch are connected, the power grid supplies power to the first load or the second load. In an independent operating state in which the third switch is turned off, the first generator or the energy storage uninterruptibly supplies power to the first load or the second load.

Uninterruptible power supply apparatus and method

Provided is a BrushLess Direct Current (BLDC) motor system including a motor driving circuit configured to control a pulse-width-modulation (PWM) inverter in a first operation mode or a second operation mode according to a control signal, and output a switching signal according to each operation mode, the PWM inverter configured to receive the switching signal to output first three-phase voltages having a first frequency in the first operation mode, and output second three-phase voltages having a second frequency in the second operation mode, a sensorless BLDC motor configured not to operate in the first operation mode by operating based on three-phase voltages having a frequency in a different band from the first frequency, and operate in the second mode by operating based on three-phase voltages having a frequency in an identical band to the second frequency, and a parameter detecting circuit configured to calculate parameter information on the sensorless BLDC motor in the first operation mode by using sensing voltages sensed in the PWM inverter.

BLDC motor system including parameter detecting circuit and operating method thereof

Provided is a motor driving circuit which transmits a driving signal to a motor, including a gate driver generating the driving signal corresponding to a pulse width modulation signal, a pulse width modulation signal generator generating the pulse width modulation signal according to Hall sensor signals received from Hall sensors mounted in the motor, a current sensor measuring a link current provided to the gate driver, a low pass filter outputting a filter current that high frequency components are removed from the measured link current, and a minimum power consumption estimating unit generating a lead angle according to a start signal with reference to the filter current, wherein the pulse with modulating signal is changed according to the lead angle.

Motor driving method and operating method thereof

Provided is a motor including a motor driving unit outputting a plurality of switching signals and any one of estimated three-phase voltages, in response to a control signal and a compensated position signal; a pulse width modulation (PWM) inverter outputting three-phase voltages and any one of estimated three-phase currents corresponding to the one estimated phase voltage, in response to the plurality switching signals; a motor unit operating based on the three-phase voltages and outputting a position signal according to the operation; and a position signal compensation unit receiving the position signal, the estimated phase voltage and the estimated phase current, detecting a phase difference between the estimated phase voltage and the estimated phase current and compensating for the position signal in response to the detected phase difference.

Position signal compensation unit of motor, and motor including the same

Provided is a maximum power extraction devices including: a battery; a voltage control unit adjusting a size of a first power outputted from the battery according to a resistor selected from a plurality of resistors, and generating a compare signal according to a size difference between an operating voltage adjusting the size of the first power depending on the selected resistor and a reference voltage; a switching unit connected between the battery and a load and adjusting a size of the operating voltage according to a size difference of the compare signal in response to first and second switching control signals; a switching control unit generating the first and second switching control signals to allow a size between the operating voltage according to the compare signal and the reference voltage to be within an error range; and a maximum power control unit measuring the number of first operations obtained by counting the occurrence number of the first or second switching control signals for a predetermined time, when the compare signal is within the error range.

Maximum power extraction device

Disclosed is a DC-DC converter, including: a switch unit configured to generate output voltage for driving a load; an output voltage monitoring unit including a reference voltage generator generating reference voltage and a reference voltage capacitor maintaining the reference voltage when power of the reference voltage generator is interrupted and configured to generate a signal for setting the output voltage as the reference voltage; a switch controlling unit configured to control the switch unit by being operated in a pulse width modulation (PWM) mode or a pulse frequency modulation (PFM) mode by using the signal of the output voltage monitoring unit; and a mode determining and power interrupting unit configured to set an operating mode of the switch controlling unit as the PWM mode or the PFM mode according to a magnitude of the load and interrupt power of the reference voltage generator when operated in the PFM mode.

DC-DC converter with modulation mode switch

Disclosed is a DC-DC converter including: a switch unit controlling a flow of a current based on a buck-boost topology; a short circuit unit short circuited or opened according to an external setting to change a topology of the switch unit; an inductor storing a current induced by the switch unit; a topology selecting unit selecting a topology in response to an external input signal and generating a signal corresponding to the selected topology; a pulse width modulating unit generating a signal for determining an operation time of the switch unit; a reverse flow detecting unit detecting a reverse flow of a current flowing through the switch unit to generate a signal; and a switch control unit controlling the switch unit in response to signals of the topology selecting unit, the pulse width modulating unit and the reverse flow detecting unit.

DC-DC converter capable of configuring topology

Disclosed is a power supply module for a hall sensorless BLDC motor, including: a high-voltage/large-current power device t applied with high voltage/large current and including a plurality of power devices driving the hall sensorless brushless direct current (BLDC) motor; a motor driving circuit sensing and controlling a positional signal or a velocity signal of the hall sensorless BLDC motor and generating a PWM control signal for controlling the hall sensorless BLDC motor; and a power device driving circuit driving the high-voltage/large-current power device according to the PWM control signal of the motor driving circuit, wherein the high-voltage/large-current power device, the power device driving circuit, and the motor driving circuit are CMOS-integrated on the same substrate.

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Daejeon, South Korea

Sewan Heo