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Circuit for generating reference voltage of semiconductor memory apparatus

Patent Number: 8111058
Publication Date: 2012-02-07
Inventor: Kang, Dong-Keum

A reference voltage generating circuit in a semiconductor memory apparatus comprises a driving control signal generating unit configured to generate a driving control signal according to a temperature variation, wherein the driving control signal generating unit is enabled in response to a power-up signal, a driving unit configured to control a voltage level, which is applied to a voltage transfer node, in response to the power-up signal and the driving control signal, and a reference ...

Cascode current mirror circuit, bandgap circuit, reference voltage circuit having the cascode current mirror circuit and the bandgap circuit, and voltage stabilizing/regulating circuit having the reference voltage circuit

Patent Number: 8111057
Publication Date: 2012-02-07
Inventors: Kiang, Jean-Fu; Liu, Chi-En

A cascode current mirror circuit and a bandgap circuit are provided. The circuits are used together and function as a reference voltage circuit. The reference voltage circuit outputs a reference current resistant to temperature variation and ripple-voltage. Accordingly, a voltage stabilizing/regulating circuit corrects error voltage precisely and promptly, and the resultant voltage is temperature insensitive and ...

Converter control device for a bidirectional power supply system having plural parallel phases

Patent Number: 8111056
Publication Date: 2012-02-07
Inventors: Hasegawa, Takahiko; Imanishi, Hiroyuki; Manabe, Kota

A converter device which is configured by connecting three converter circuits in parallel is provided between a secondary battery serving as a first power supply and a fuel cell serving as a second power supply. Two differential ammeters are placed on three reactors corresponding to the three converter circuits. A control unit includes a passing electric power calculation module which calculates electric power passing through the converter device on the basis of detected values of the two ...

Method for controlling a direct current chopper controller

Patent Number: 8111055
Publication Date: 2012-02-07
Inventor: Landwehr, Frank

A method of controlling a direct current (“DC”) chopper controller having a switch and a storage choke in which the choke has a current dependent on the switching of the switch on and off includes the following. A current variable derived from one of the time averaged value of the current of the choke and the peak value of the current of the choke is determined. A switching frequency for synchronizing the turning on and off the switch is calculated as a function of the current variable ...

Voltage conversion device capable of enhancing conversion efficiency

Patent Number: 8111054
Publication Date: 2012-02-07
Inventors: Yu, Tsung-Yin; Yen, Chih-Jen

A voltage conversion device capable of enhancing conversion efficiency includes a charge pump for generating output voltage linear to input voltage according to the input voltage, a feedback unit for generating a feedback signal according to the output voltage generated by the charge pump, and a regulating unit for outputting and adjusting the input voltage according to the feedback signal provided by the feedback unit, so as to keep the output voltage ...

DC-DC converter

Patent Number: 8111053
Publication Date: 2012-02-07
Inventors: Tsuruya, Mamoru; Asuke, Hideki; Takano, Hideharu; Yamamoto, Masayoshi; Ochiai, Masashi; Kawashima, Takahiro; Funabiki, Shigeyuki

The present invention provides a DC-DC converter including a first series circuit connected to both ends of a first switch and formed of a winding of a first transformer, a first reactor, a first diode, and a smoothing capacitor, a second diode connected to a connection point of a primary winding of the first transformer, the winding of the first transformer and the first switch, and to one end of the smoothing capacitor, a second series circuit connected to both ends of a second switch and ...

Zero voltage switching

Patent Number: 8111052
Publication Date: 2012-02-07
Inventor: Glovinsky, Tzachi

A method for providing non-resonant zero-voltage switching in a switching power converter. The switching power converter converts power from input power to output power during multiple periodic switching cycles. The switching power converter includes a switch and an auxiliary capacitor adapted for connecting in parallel with the switch, and an inductor connectable to the auxiliary capacitor. The main switch is on. A previously charged (or previously discharged) auxiliary capacitor is ...

Step-down switching regulator

Patent Number: 8111051
Publication Date: 2012-02-07
Inventors: Sakai, Masaru; Umemoto, Kiyotaka

An output monitoring comparator outputs an ON signal when an output voltage becomes lower than a reference voltage. A pulse modulator generates a pulse signal at a predetermined level, an ON time-period from when the ON signal is outputted. A driver circuit alternately turns ON, after a dead time, a switching transistor and a synchronous rectification transistor, based on the pulse signal. A light load mode detector compares a switching voltage at a connection point of the switching ...

Power factor control systems and methods

Patent Number: 8111050
Publication Date: 2012-02-07
Inventors: Lin, Jianqing; Sutardja, Sehat

A boost converter comprises an inductance that receives an input signal. A switch controls current supplied by the inductance to a load. A power factor control module comprises a mode control module that selects an operating mode of the boost converter and a switch control module that switches the switch at a frequency. The frequency is equal to a first frequency when the mode control module selects a continuous mode and equal to a second frequency when the mode control module selects a ...

Power supply device for an electric circuit

Patent Number: 8111049
Publication Date: 2012-02-07
Inventor: Schubert, Goeran

In the case of a power supply device (2) for an electric circuit (3), an energy source (4) and an electric filter (7) are provided for the reliable and low-emission supply of energy to the electric circuit (3), wherein the energy source (4) and the electric filter (7) interact in such a way that the power supply device (2) has, at a filter output (9), a voltage source characteristic in a first frequency range and a current ...

Power saving system for household electric appliance

Patent Number: 8106645
Publication Date: 2012-01-31
Inventor: Li, Wing Chung

A power saving system for a household electric appliance includes a signal processing unit, a step down network having an adjustable impedance for stepping down an input voltage, and an impedance control switch electrically connected with the step down network and configured for controlling the impedance of the step down network. The signal processing unit is electrically connected to impedance control switch and configured to monitor the working condition of the household electric ...

Reference circuit with start-up control, generator, device, system and method including same

Patent Number: 8106644
Publication Date: 2012-01-31
Inventor: Kalyanaraman, Vignesh

A reference generator circuit generates a reference signal for use by a regulator in generating operational power for circuits and devices. A start-up circuit includes a self-biased voltage reference and a differential amplifier configured to generate a start-up signal to induce current flow in response to a voltage independent reference signal during a start-up phase of the circuit and cease inducing the current flow following the start-up phase of the circuit. The reference signal is ...

Power supply apparatus

Patent Number: 8106643
Publication Date: 2012-01-31
Inventor: Tsai, Chih-Chang

A power supply apparatus is provided. The power supply apparatus includes two power suppliers coupled in parallel so as to simultaneously supply the electric power required by an electronic product in operation. The power supply apparatus provided by the invention may stably/accurately output the desired DC output voltage to the electronic product, and may further in advance increase a main power generated inside the other power supplier when one of the power suppliers is over voltage, ...

Current mode buck converter with fixed PWM/PFM boundary

Patent Number: 8106642
Publication Date: 2012-01-31
Inventors: Chen, Chih-Ning; Sheng, Kang

A current mode buck converter is disclosed. The buck converter operates in a pulse width modulation (PWM) mode or a pulse frequency modulation (PFM) mode. To prevent an output inductor with various probable magnitudes from varying a decision boundary between the PWM mode and the PFM mode, the buck converter adaptively adjusts a triggering condition for the pulse frequency modulation mode according to an average value of an inductor current of the output inductor or AC components of the ...

System and method for providing stable control for power systems

Patent Number: 8106641
Publication Date: 2012-01-31
Inventors: Lin, Yuan; Ye, Jun; Fang, Lieyi

System and method for providing stable control for power systems. According to an embodiment, the present invention provides an apparatus for providing one or more control signals for a power system. The apparatus includes an input terminal for receiving an electrical energy, which can be characterized by a first input voltage. The apparatus includes a control component that is configured to generate a first control signal based on at least information associated with the first input ...

Power supply control circuit, power supply device, power supply system, and method of controlling power supply control device

Patent Number: 8106640
Publication Date: 2012-01-31
Inventor: Itakura, Kazuhiko

A power supply control circuit detects a reference voltage VD corresponding to an intermediate voltage of a Hi Side FET and a Lo Side FET, when a short-circuit fault of the Lo Side FET is generated, and compares a threshold value VIN−VrefH and the reference voltage VD using a comparator COMP. The power supply control circuit determines that the short-circuit fault is generated, when the reference voltage VD is less than the threshold value VIN−VrefH and a switching control signal (HiDr) ...

Feed forward control of switching regulator

Patent Number: 8106639
Publication Date: 2012-01-31
Inventors: Ju, Shu-Ing; Rajagopalan, Jayendar; Huard, Jeffry Mark; Paul, Rajarshi

The invention relates to a switching regulator with an error amplifier circuit and a feed-forward circuit. The error amplifier circuit provides an error signal by amplifying the difference between a feedback signal and a reference signal. The feed-forward circuit level-shifts the output of the error amplifier based on the feed-forward input signal and a scaling factor. The resulting adjusted error signal includes both feed-back and feed-forward signal components. A PWM comparator is ...

Power control circuit with coupling circuit for controlling output power sequence and liquid crystal display using same

Patent Number: 8106638
Publication Date: 2012-01-31
Inventor: Huang, Shun-Ming

An exemplary power control circuit (24) includes a scaler circuit (245) configured for outputting a control signal, a voltage converter (27) configured for converting a received voltage into a plurality of desired voltages, a first control unit (28), a second control unit (29), and a coupling circuit (26). The first control unit is configured for controlling whether a first voltage is applied to the voltage converter. The second control unit is ...

Programmable floating gate reference

Patent Number: 8106637
Publication Date: 2012-01-31
Inventors: Rodgers, Thurman J.; Kutz, Harold; Snyder, Warren

A system includes a controllable voltage generator to generate a power supply voltage. The system also includes a system controller to determine a voltage level associated with the power supply voltage, and prompt the controllable voltage generator to generate the power supply voltage. The system includes a floating gate reference device to generate an absolute voltage reference based, at least in part, on the voltage level associated with the power supply voltage. The system can also ...

Method and apparatus for power conversion with wide input voltage range

Patent Number: 8106636
Publication Date: 2012-01-31
Inventors: Asinovski, Alexander; Wanes, John; Ozkaynak, Isaac; Dragojevic, Milan

A power conversion system includes an input terminal that is arranged to be connected to a voltage source; a transformer having a first winding connected to the input terminal and a second winding connected to an output terminal of the power conversion system, either the first winding or the second winding is provided with at least three taps that are arranged to divide the first winding or the second winding into at least two sub-windings; at least one tap switch connected to the at least ...

Power converter

Patent Number: 8106635
Publication Date: 2012-01-31
Inventors: Watanabe, Yasuto; Hirakawa, Mitsuaki; Hashino, Satoshi

A power converter includes an input unit, an output unit, first and second capacitors connected in series, a first electric conduction control device, a second electric conduction control device, a third electric conduction control device, and a fourth electric conduction control device, and a control circuit for performing on/off control on those electric conduction control devices. The first electric conduction control device and the fourth electric conduction control device have a first ...

Switching power supply and portable device

Patent Number: 8106634
Publication Date: 2012-01-31
Inventors: Hojo, Yoshiyuki; Nakabayashi, Hirotaka

A switching power supply includes a switching element connected to a power supply voltage and performs ON and OFF operation; a control circuit; a coil; a capacitor connected to the coil and performs a rectifying operation with the coil; an oscillator to output an oscillator signal to the control circuit; a first comparator for comparing a current detection voltage which transforms a detection current flowing through the coil into a voltage, and the feedback voltage according to a difference ...

PSRR regulator with UVLO

Patent Number: 8102168
Publication Date: 2012-01-24
Inventor: Wong, Kern Wai

The invention relates to a regulator with an under-voltage lock-out (UVLO) circuit and a reference generator circuit (e.g., a band-gap reference). The UVLO circuit includes an internal band-gap reference circuit and a comparison circuit. The UVLO circuit compares an input voltage with the output of the internal band-gap reference circuit to selectively enable the regulator. The output of the internal band-gap reference circuit is also employed to power the reference generator circuit. The ...

Phase-cut dimming circuit

Patent Number: 8102167
Publication Date: 2012-01-24
Inventors: Irissou, Pierre; Drexler, Bernard; Colmet-Daage, Etienne

Methods, systems, and devices are described for sensing a phase-cut dimming signal and outputting a control signal compatible with a switching power circuit. Embodiments of the invention generate at least one of a low-frequency pulse-wave-modulated control signal, an analog output control signal, or a digital (e.g., higher-frequency pulse-wave-modulated) output control signal. Some embodiments further provide preloading and/or startup control functionality to allow proper functioning of the ...

Power source device and output voltage stabilizing method

Patent Number: 8102166
Publication Date: 2012-01-24
Inventor: Iino, Yasuhiro

A power source device includes: a switching section switching an input voltage supplied to a load section; a smoothing inductor section smoothing and outputting an output current to be supplied to the load section in accordance with a switching of the switching section; a first inductor section decreasing an output inductance value of the smoothing inductor section; a second inductor section increasing the output inductance value of the smoothing inductor section; an electromagnetic ...

Means of eliminating electrolytic capacitor as the energy storage component in the single phase AD/DC two-stage converter

Patent Number: 8102165
Publication Date: 2012-01-24
Inventors: Ruan, Xinbo; Yao, Kai; Xu, Ming; Gu, Linlin

A power factor correction (PFC) circuit includes an inductor, a diode, a storage capacitor, a switch and a control unit. The input power has a voltage fluctuation V₁. The storage component absorbs a first voltage fluctuation and a switch regulation circuit absorbs a second voltage fluctuation V₂. Thus output voltage from the PFC circuit is not a conventional constant voltage but a voltage of a great ripple. The PFC circuit further has a harmonic regulation unit. The ...

Power factor correction converter control offset

Patent Number: 8102164
Publication Date: 2012-01-24
Inventors: Colbeck, Roger; DeMone, Paul; Reinberger, Anthony Peter Ernest

Power factor correction converter control offset apparatus and methods are disclosed. In one aspect, an apparatus includes a control unit to generate a control signal to control a duty cycle of a PWM (Pulse Width Modulation) switching signal that controls a switch in a PFC (Power Factor Correction) converter. An offset unit is also included and is coupled to the control unit, to generate a variable offset signal to offset the control signal or a signal used by the control unit to generate ...

Voltage regulator

Patent Number: 8102163
Publication Date: 2012-01-24
Inventor: Imura, Takashi

Provided is a voltage regulator which can achieve high-speed response and is not susceptible to a ripple. An amplifier (19) and an amplifier (23) provide push-pull output to an output transistor (14). Therefore, even when an idling current is small, a sink current and a source current with respect to a gate of the output transistor (14) can be increased in a balanced manner. Thus, the voltage regulator can easily achieve high-speed response. In addition, even ...

Buck controller having integrated boost control and driver

Patent Number: 8102162
Publication Date: 2012-01-24
Inventors: Cormie, Leigh; Liu, Jun; Moussaoui, Zaki

An integrated circuit controller for controlling the operation of a voltage converter which includes a first comparator for comparing a voltage associated with an input of a boost converter with a threshold voltage and generating a control signal in response thereto. A second comparator compares a second voltage associated with an output of the boost converter with the threshold voltage and generates a second control signal in response thereto. Driver circuitry generates a first switching ...

Stable output in a switching power supply by smoothing the output of the secondary coil

Patent Number: 8102161
Publication Date: 2012-01-24
Inventor: Nakahori, Wataru

This switching power supply provides a stable output. In the switching power supply, at least pairs of secondary side coils are connected to each of the center tap rectifier circuits and the secondary side coils of each of the center tap rectifier circuits are disposed in the core portions (cores) of mutually different ...

Saturation preventing power factor improving method and apparatus

Patent Number: 8102160
Publication Date: 2012-01-24
Inventors: Lee, Jin-hyung; Lee, Kyoung-geun; Woo, Won-myung

Provided are a method and apparatus for improving the power factor of an input power. The apparatus includes an input unit receiving the input power, a power factor correction unit correcting the power factor of the input power applied to the input unit, and a saturation prevention unit controlling the power factor correction unit such that the corrected power does not exceed a set power ...

Current negative-feedback circuit and DC-DC converter using the circuit

Patent Number: 8098059
Publication Date: 2012-01-17
Inventors: Nakahashi, Yasunori; Yamane, Satoshi

A current negative-feedback circuit comprises a current detection unit and a sawtooth-shaped waveform generation unit. The current detection unit comprises a first P-ch MOSFET Q2 and a second P-ch MOSFET Q3 which constitute a current mirror circuit, a current adjustment resistor R4, a current detection resistor R1, and a constant current source I1. The current mirror circuit outputs current almost proportional to the charge current of an inductance via a ...

Circuit arrangement comprising a load transistor and a measuring transistor

Patent Number: 8098058
Publication Date: 2012-01-17
Inventors: Theil, Aron; Thiele, Steffen

One aspect is a circuit arrangement having a load current path with a load transistor having a first and a second load path terminal and a control terminal. A first measurement current path includes a measuring transistor having a first and a second load path terminal and a control terminal. The control terminals and first load path terminals of the load transistor and the measuring transistor are coupled. A first regulating circuit has a controllable resistor and is designed to drive the ...

Constant voltage circuit including supply unit having plural current sources

Patent Number: 8098057
Publication Date: 2012-01-17
Inventor: Morino, Koichi

A constant voltage circuit configured to convert an input voltage into an output voltage having a predetermined level is disclosed. The constant voltage circuit includes a differential amplifier circuit configured to produce an output signal having a voltage level in response to a reference voltage and the output voltage; and an output circuit configured to receive the output signal and produce a current in response to the voltage level of the output signal. The output voltage is ...

Bidirectional converter and electronic device

Patent Number: 8098056
Publication Date: 2012-01-17
Inventors: Nagai, Tamiji; Terada, Yukihiro; ; Yamazaki, Kazuo; Tanaka, Hidenori

Provided is a bidirectional converter which has flexibility to be applicable in various conditions and performs stable switching of operation mode at high efficiency. An electronic device which supplies power in various conditions and operates with excellent efficiency is also provided. An electronic device is provided with a bidirectional converter, which has a reactor and four switches between power supply input terminals and a secondary battery, and a system circuit is supplied with an ...

Step-up converter systems and methods

Patent Number: 8098055
Publication Date: 2012-01-17
Inventors: Hadar, Ron; Arditi, Shmuel; Avrutsky, Mordechay; Avrutsky, Idan

Methods and systems with a step-up converter are provided based on a boost converter. In one aspect, a step-up converter includes: a boost converter having a first inductor; a second inductor paired on a core with the first inductor; and a rectifier circuit coupled with the second inductor to generate a direct current ...