Abstract:
PROBLEM TO BE SOLVED: To provide a switching power supply apparatus which reacts to load variation at high speed, ensures stable output voltage, and can produce a high output current through parallel connection. SOLUTION: The optimum response multimode digital current program system control unit of the switching power supply apparatus has an operation mode detection circuit which switches the operation mode by detecting a rapid change in the output voltage, a peak/valley detection and optimum current difference calculation unit which detects the extreme value of the output voltage and calculates the amount of charges that are lost from a capacitor, and an inductor current detecting and memorizing device which detects and memorizes the inductor current when the extreme value of the output voltage is detected, wherein on/off operation of the first switching element or the second switching element is controlled according to control by means of the operation mode detection circuit, the peak/valley detection and optimum current difference calculation unit, and the inductor current detection and memorizing device. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To obtain a DC-DC converter that is low in power consumption and high in efficiency and which enables stable operation and attainment of appropriate slope compensation, at dynamic change of the output voltage. SOLUTION: The DC-DC converter includes a switching circuit (23, 24, 25) that is driven by a drive signal and converts a voltage value between input and output; an error amplifier (17) that generates a signal of the error between a target output voltage value to be outputted from the output and an output voltage value at the output; a PWM comparator (20, 21) that generates a PWM signal, based on the error signal; a current feedback signal between input and output, and a slope compensation signal for a current value between input and output; and a latch circuit (22) that generates a drive signal, based on the PWM signal and a predetermined periodic signal. The DC-DC converter is provided with an output voltage setting register (10), that records a set voltage value corresponding to the target output voltage value, and a slope compensation circuit (13) that generates a slope compensation signal that contains the amount of slope compensation corresponding to the set voltage value. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor device that suppresses carrier injection into a substrate, and to provide a power supply circuit. SOLUTION: The semiconductor device has: a fourth semiconductor region 26 of a second conductivity type, provided on a surface of a semiconductor layer 22 of a first conductivity type while spaced apart from a first semiconductor region 23 of the second conductivity type, a second semiconductor region 24 of the second conductivity type, a third semiconductor region 25 of the first conductivity type; a fifth semiconductor region 27 of the first conductivity type, provided on the surface of the semiconductor layer 22 while spaced apart from the first semiconductor region 23, second semiconductor region 24, and third semiconductor region 25; and a floating electrode 35 connecting the fourth semiconductor region 26 and the fifth semiconductor region 27 to each other. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
A method of controlling a switched-mode power supply and corresponding power supply including a switching cell including two series-connected configurable on/off switches; in which the switching cell is configured cyclically: for a duration T1, in an on state, in which a first on/off switch is closed and the second on/off switch is open; and, for a duration T2, in an off state, in which the second on/off switch is closed and the first on/off switch is open. The switching cell is also configured in a transition state, in which the first on/off switch and the second on/off switch are open: for a duration Tm1 between the off state and the on state; and for a duration Tm2 between the on state and the off state; and the durations T1 and/or T2 of the on and off states are determined according to the durations Tm1 and/or Tm2, respectively, of the transition states.
Abstract:
PROBLEM TO BE SOLVED: To provide a DC-DC converter and organic electroluminescence display unit using the same, capable of generating a voltage of a first power supply so that an electric current running through an organic light-emitting diode is applied regardless of the voltage of a power supply input through a battery. SOLUTION: The DC-DC converter and organic electroluminescence display unit using the same is provided with: a voltage detection part which detects a voltage level of a driving power supply; a booster circuit which receives and boosts the driving power supply to generate and output a first power supply; an inverter circuit which receives and reverses the driving power supply to generate and output a second power supply; and a PWM control part which controls the booster circuit and the inverter circuit and regulates voltages of the first power supply and the second power supply; however, when the voltage of the driving power supply detected by the voltage detection part is higher than a predetermined voltage, reduces the voltage of the driving power supply more than that of the first power supply by dropping the voltage of the driving power supply. COPYRIGHT: (C)2010,JPO&INPIT