Patent•
Double frequency pulse wave width modulating and voltage stabilizer
03 Dec 2003-
TL;DR: In this article, a dual-frequency PWM voltage stabilizer features that HF of LF can be chosen for high load or low load, depending on use of high-load refrence voltage and low load reference voltage.
Abstract: A dual-frequency PWM voltage stabilizer features that HF of LF can be chosen for high load or low load The high or low load can be determined by use of high-load refrence voltage and low-load reference voltage When the error signal is higher than high-load reference voltage, current load is high load, and otherwise, it is a low load when the error signal is lower than low-load reference voltage Its advantage is high transform efficiency of power supply
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Patent•
07 Jul 2009
TL;DR: In this paper, a dual mode modulator is proposed for driving a power output stage having a serial connection of high-side power FET and low-side FETs, and a dynamic slew rate booster can be added to boost up an error amplifier slew rate of the PWM modulator from its normal operating slew rate during the mode transition period.
Abstract: A dual mode modulator is proposed for driving a power output stage having a serial connection of high-side power FET and low-side power FET. The dual mode modulator includes a PWM modulator operating under a PWM-frequency and a PFM modulator for controlling the power output stage. To improve the dynamic load regulation of the dual mode modulator, a dynamic frequency booster can be added to the dual mode modulator to boost up the PWM-frequency from its normal operating frequency during a PFM-to-PWM mode transition period. Secondly, a dynamic slew rate booster can be added to boost up an error amplifier slew rate of the PWM modulator from its normal operating slew rate during the mode transition period. Thirdly, a dynamic turn-off logic circuit can be added to turn off the low-side power FET during the mode transition period.
12 citations
Patent•
22 Dec 2004TL;DR: In this paper, it is shown that it is possible to increase an efficiency of a DC/DC converter by varying a turn ratio of an inductor among the circuit devices of a converter and adjusting an inductance L.
Abstract: Embodiments according to the present invention can enhance an efficiency of an apparatus or method capable of converting power of a system. An apparatus for converting power includes a load state variation detector that detects a load characteristic state of the load unit; and an adjusting unit that adjusts a preset value of the circuit device of the load unit in accordance with the value detected by the load state variation detector. A method for controlling a power includes checking a load characteristic with respect to one or more than one element of system elements; and adjusting one or more than one circuit device value of a power block of the one or more than one element with respect to the load characteristic. In embodiments, it is possible to increase an efficiency of a DC/DC converter by varying a turn ratio of an inductor among the circuit devices of a converter and adjusting an inductance L.
5 citations
Patent•
24 Apr 2013
TL;DR: In this article, a primary side control method and a power controller are presented, where the power controller comprises a comparator and an opening and triggering controller, which can represent secondary side voltage of a secondary side winding through an inductive coupling function.
Abstract: The invention provides a primary side control method and a power controller. The power controller comprises a comparator and an opening and triggering controller. The comparator compares feedback voltage and an overhigh voltage reference value. The feedback voltage can represent secondary side voltage of a secondary side winding through an inductive coupling function. The opening and triggering controller is connected on the comparator through a coupling. When the feedback voltage is lower than the overhigh voltage reference value, the opening and triggering controller enables a power switch to approximately operate in a first switching frequency. When the feedback voltage is higher than the overhigh voltage reference value, the opening and triggering controller enables the power switch to approximately operate in a second switching frequency. The second switching frequency is lower than the first switching frequency.
3 citations
Patent•
23 Nov 2016
TL;DR: In this article, a BOOST circuit for improving the transient response was proposed, which consists of a working circuit provided with an energy storage element, a switching device assembly and a control unit.
Abstract: The invention relates to the technical field of electronics, and particularly relates to a BOOST circuit for improving the transient response. The circuit comprises a working circuit provided with an energy storage element, a switching device assembly and a control unit. The working circuit is used for generating an output voltage higher than an input voltage. The switching device assembly is used for controlling the working circuit to be alternately switched between the charging mode and the discharging mode under the effect of a PWM modulation signal or a PFM modulation signal. The control unit is used for generating the PWM modulation signal or the PFM modulation signal according to a reference voltage, a voltage feedback signal sampled from the output end of the switching voltage regulator, a current detection signal sampled from the working circuit and a switching control signal, and then generating a modulating signal of a preset duty ratio within a preset time period. According to the technical scheme of the invention, when a load is increased transiently, a predetermined duty cycle is generated, such as a modulation signal with a duty ratio of 99%. Therefore, the capacitor of the load is fully charged, and the reduction of the output voltage is lowered. The transient response of the circuit can be improved and the system stability is ensured.
2 citations
Patent•
27 Jul 2016
TL;DR: In this paper, a step-down switching voltage regulator for improving the transient response comprises a working circuit provided with an energy storage element, a switching device assembly and a control unit, which is used for controlling the working circuit to be alternately switched between the charging mode and the discharging mode under the effect of a PWM modulation signal or a PFM modulation signal.
Abstract: The invention relates to the technical field of electronics, and particularly relates to a switching voltage regulator. A step-down switching voltage regulator for improving the transient response comprises a working circuit provided with an energy storage element, a switching device assembly and a control unit. The switching device assembly is used for controlling the working circuit to be alternately switched between the charging mode and the discharging mode under the effect of a PWM modulation signal or a PFM modulation signal. The control unit is used for generating the PWM modulation signal or the PFM modulation signal according to a reference voltage, a voltage feedback signal sampled from the output end of the switching voltage regulator, a current detection signal sampled from the working circuit and a switching control signal, and then generating a modulating signal of a preset duty ratio within a preset time period. According to the technical scheme of the invention, when the step-down switching voltage regulator enters the PFM mode, a modulating signal with the duty ratio thereof to be 99% can be outputted within a first period after the load is increased suddenly. Therefore, a load capacitor can be fully charged, and the decreased amount of the output voltage is reduced. The transient response of the circuit is improved.
2 citations
References
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Patent•
21 Sep 1998TL;DR: In this paper, a switching regulator of which efficiency is increased while the switching regulator is operated under low load condition is disclosed, which is arranged by a reference voltage circuit, an error amplifier for entering thereinto the reference voltage and a measuring voltage produced by subdividing an output voltage from the switch regulator.
Abstract: A switching regulator of which efficiency is increased while the switching regulator is operated under low load condition is disclosed. The switching regulator is arranged by: a reference voltage circuit for producing a reference voltage; an error amplifier for entering thereinto the reference voltage and a measuring voltage produced by subdividing an output voltage from the switching regulator and for amplifying a difference voltage between the reference voltage and the measuring voltage; an oscillator circuit for outputting an oscillator signal; a PWM comparator for comparing an output voltage of the error amplifier with an output voltage of the oscillator circuit; load detecting means for detecting an output load current; and efficiency varying means for varying an efficiency of the switching regulator in response to load conditions detected by the load detecting means.
51 citations
Patent•
17 May 1999TL;DR: In this article, a Power Factor Correction (PFC) circuit with a switch coupled to a resistor and a capacitor is described, where a current detector is used to detect the current flowing through an inductor of the boost converter.
Abstract: A Power Factor Correction (PFC) circuit according to the present invention includes a boost converter which outputs a predetermined voltage according to control of a switch. The switch is coupled to a resistor and a capacitor which, by forming a current detector, detect the current flowing through an inductor of the boost converter. The output voltage of the boost converter is divided by resistors, and the voltage difference between the divided voltage and a reference voltage is amplified by an error amplifier. The output voltage of the error amplifier and a reverse sawtooth waveform provided from an oscillator are input in a multiplier so as to be multiplied by a gain, and output voltages of the multiplier and of the current detector are provided to a switching driver. The switching driver turns off the switch when the output voltages of the current detector and of the multiplier are equal, and turns on the switch when the state of the reference clock signal is changed.
43 citations
Patent•
08 Jun 1989TL;DR: In this article, a control circuit consisting of an oscillator controlling the periodic switching of a control transistor and a comparator which controls the momentary clamping of control transistor in the condition wherein the charge circuit is interrupted when the difference between the voltage across capacitance and the power supply voltage exceeds a preset maximum value and the unclamping of the same transistor when such difference falls below a preset minimum value.
Abstract: The circuit comprises a tank capacitance and a charge circuit supplied with the same voltage as the bridge and comprising an inductance and a control transistor. There is also provided a control circuit, which comprises an oscillator controlling the periodic switching of control transistor and a comparator which controls the momentary clamping of control transistor in the condition wherein the charge circuit is interrupted when the difference between the voltage across capacitance and the power supply voltage exceeds a preset maximum value and the unclamping of the same transistor when such difference falls below a preset minimum value. A further comparator similarly clamps control transistor if there is an excess current in the transistor itself.
33 citations