Abstract:
PURPOSE: A power control driving device and a method thereof are provided to have reduced output noise. CONSTITUTION: A power control driving device includes a sine wave signal generating unit(110), a control signal converting unit(120) converting the sine wave, which is input from the sine signal generating unit, to a multi-bit control signal; and a three phase inverter circuit(130) outputting a voltage changed by a multi-bit control signal inputted from the control signal converting unit. The control signal converting unit includes a multi-bit sigma-delta modulator (121-123) converting an analog sine wave into a digital signal. The three phase inverter circuit includes a plurality of switches (131a, 131b, 132a, 132b, 133a, 133c) that the on-off state is changed by the multi-bit control signal inputted from the control signal converting unit. [Reference numerals] (110) Sine wave signal generating unit; (121) First sigma-delta modulator; (122) Second sigma-delta modulator; (123) Third sigma-delta modulator; (131a) Top of a first switch; (131b) Bottom of the first switch; (132a) Top of a second switch; (132b) Bottom of the second switch; (133a) Top of a third switch; (133b) Bottom of the third switch
Abstract:
PURPOSE: An energy storage system which is equipped with a wired and wireless energy transmission function is provided to store and distribute various energies by providing a system for smart grid. CONSTITUTION: An energy input unit (110) inputs energy. An energy wireless transceiver (130) wirelessly transmits and receives the energy. An energy storage/control unit (140) stores the energy. An energy output unit (160) consumes the stored energy. An energy output control unit (150) distributes the stored energy to the energy output unit. [Reference numerals] (110) Energy input unit; (120) Energy input control unit; (130) Energy wireless transmission/receiving unit; (140) Energy storage/control unit; (150) Energy output control unit; (160) Energy output unit
Abstract:
A motor position detecting unit according to the present invention includes a first calculator which outputs a three-phase counter electromotive force based on a linear operation; a second calculator which outputs a three-phase counter electromotive force based on a non-linear operation; and an operation controller which receives a control signal and a three-phase voltage and current and selects one of the first calculator and the second calculator based on the received control signal and the three-phase voltage and current. The control signal includes the operation mode information of an external motor.