Abstract: A current-input-type parallel resonant DC/DC converter and a method thereof are provided. The converter includes an inverter-circuit for inverting/converting an input DC current into a positive-and-negative alternating square-wave-current, a resonant-network for converting the square-wave-current into a sine-voltage, a transformer for realizing the isolation of the power transmission, a full-wave rectifier-circuit for rectifying the sine-voltage, and an output-filter-circuit for producing a DC output-voltage.

Abstract: A switching power source apparatus includes a high-side MOSFET 11 connected to an input voltage, a ramp signal generator 18 to generate a ramp signal in synchronization with a switching frequency of the high-side MOSFET 11, an amplitude signal generator to generate an amplitude signal Comp corresponding to an amplitude of the ramp signal, a superposing circuit 3 to generate a second ramp signal having a positive inclination corresponding to the amplitude and frequency of the ramp signal and provide a superposed signal by superposing the second ramp signal on a first reference voltage, a controller 1 to control the ON timing and ON width of the high-side MOSFET 11, and a sudden heavy load detector 23 to detect if light load changes to heavy load, and if detects such a change, widen the ON width of the high-side MOSFET 11.

Abstract: A control device of a self-excited reactive power compensation apparatus controls a reactive current output from a self-excited converter to a power system. The control device includes a first reference generating unit, a second reference generating unit, and a selecting unit. The first reference generating unit generates a first voltage reference of an output voltage output from the self-excited converter, such that the reactive current detected by a reactive current detecting unit follows a current reference. The second reference generating unit generates a second voltage reference of the output voltage output from the self-excited converter, such that a value of the reactive current becomes a predetermined value. The selecting unit selects a maximum value from the first and second voltage references.

Abstract: In one aspect of the present invention, a converter circuit with input voltage balance includes a plurality of modules having inputs electrically series-connected to each other and outputs electrically parallel-connected to each other and a plurality of switching circuits with each electrically connected to an input connection node of a corresponding module and its immediate next module, and configured such that when an input voltage of the corresponding module or its immediate next module is in a desired range from a first predetermine value to a second predetermined value greater than the first predetermined value, the switching circuit operates in an open state, while when the input voltage is out of the desired range, the switching circuit operates in a conductive state so as to regulate the input voltage of the corresponding module or its immediate next module in the desired range.

Abstract: A controller for use in an LLC resonant converter is disclosed. An example controller is controlled by detecting a maximum frequency signal to set a maximum switching frequency of the LLC resonant converter. A burst stop frequency and a burst start frequency are programmed in response to the maximum switching frequency. The burst stop frequency and the burst start frequency are fractions of the maximum switching frequency. The LLC resonant converter is switched in response to a feedback signal to regulate an output of the LLC resonant converter. The steps of switching the LLC resonant converter in a burst mode in response to the feedback signal reaching a value corresponding to the programmed burst start frequency and of stopping the switching of the LLC resonant converter in the burst mode in response to the feedback signal reaching a value corresponding to the programmed burst stop frequency are repeated.

Abstract: A resonant converter (10) comprising a voltage compensation circuit (72, 73) configured to generate a periodic compensation voltage signal (Vslopecompens) at a switching frequency of the converter such that conduction intervals (31, 32) are ended according to first and second voltage levels in combination with the periodic compensation signal.

Abstract: A buck converter includes a power supply unit, two MOSFETs and a delay circuit. The PWM module is coupled to the gates of the two MOSFETs to alternatively turn on the two MOSFETs. The delay circuit is coupled between an output terminal and an input node of the PWM module for making sure that a voltage applied to the PWM module is after a voltage applied to a drain the MOSFETs.