Electricity: power supply or regulation systems inventions 12/05

20050285575 - Power supply integrated circuit with feedback control: A system and method for providing power control in a power management integrated circuit. A power management integrated circuit may comprise a communication interface module that receives power supply information from at least one electrical device external to the power management integrated circuit. The power supply information may, for example,...

20050285576 - Power dimmer: A circuit for controlling the power in a load supplied by an A.C. voltage and directly connected to a first terminal of application of the A.C. voltage, including two isolated-gate bipolar transistors, connected in anti-parallel between a second terminal of application of the A.C. voltage and the load; circuitry for...

20050285577 - Step-up / step-down circuit: A step-up/step-down circuit can be simplified as compared with conventional circuits by including a step-down unit for receiving a system clock pulse alternately providing a reference voltage (GND) and a system voltage VDD in a repeated manner to output a voltage V4 lower than the reference voltage (GND) by using...

20050285579 - Control circuit of dc-dc converter and its control method: In a DC-DC converter of synchronous rectifying system, a control circuit of DC-DC converter capable of improving the control voltage value of output voltage at light load and enhancing the power conversion efficiency, and its control method are presented. An inverting input terminal of comparator COMP2 of which non-inverting input...

20050285580 - Current sense circuit and method for a dc-to-dc converter: In a DC-to-DC converter, a current sense circuit and method generate a first current by a first transconductive amplifier responsive to the output current of the converter for a controller to switch a high side switch and a low side switch, a second current from a first voltage by a...

20050285583 - High frequency partial boost power factor correction control circuit and method: A circuit for providing power factor correction comprising a boost converter circuit having a boost inductance and a power factor correction switch coupled in series with the boost inductance, the boost inductance and power factor correction switch being coupled across the output of a rectifier being supplied with AC power...

20050285581 - Interface circuit of a hall ic and system for using them: To provide a Hall element interface circuit that, regardless of the specifications of Hall elements used, contributes to correct detection of magnetism, reduction in heating in the Hall elements, and an increase in reliability, and a system using the Hall element interface circuit. A power supply circuit such as a...

20050285582 - Pwm circuit control method: In the PWM circuit of the present invention, a PWM counter counts clock signals. A reference value setting register sets a comparative reference value for determining a duty ratio of a PWM signal. A comparator generates the PWM signals based on a comparative result of the comparative reference value and...

20050285578 - Supply switch circuit for implementing a switchable on-chip high voltage supply: A supply switch circuit is provided for implementing a switchable on-chip high voltage supply. A stack of transistors is coupled between an on-chip high voltage supply and a circuit node. A control signal is coupled to the stack of transistors for selectively switching the high voltage supply to the circuit...

20050285584 - Power supply regulator with digital control: An integrated circuit and method in an integrated circuit for providing electrical power utilizing digital power regulation. Various aspects of the present invention provide an integrated circuit comprising a power supply module that outputs electrical power at an output voltage level. An error determination module may receive a power supply...

20050285585 - Dc-dc converter: A DC-DC converter includes an Nch FET1 which is series connected between an input terminal and an output terminal, and an Nch FET2 which is connected between the output terminal side of the Nch FET1 and a ground terminal. On the output terminal side of the circuits, a smoothing circuit...

20050285586 - Temperature compensated bias network: A method and apparatus for a temperature compensated bias network, such as may be embodied as an integrated circuit is disclosed. Embodiments provide for a wide range of desired temperature characteristics with good stability. Current mirror components with active leakage circuits may act to provide consistent operating parameters over a...

20050280401 - Efficiency improvement of dc-dc converter: Actual switching DC-DC converters have disadvantages in specific operating regions due to different reasons for power losses. Large switching transistors provide favorable efficiency at high output currents, but need high currents to charge/discharge the switching transistor's gate, resulting in poor efficiency at low output currents. Small transistors are more efficient...

20050280402 - Dc-dc converting method and apparatus: A DC-DC converting apparatus including a step-up and step-down circuit stepping up/down an input voltage to generate an output voltage and a PWM control circuit. The PWM control circuit generates an error signal, first to third voltages, a first triangular wave signal varying between the first and second voltages, and...

20050280404 - Current replication to avoid leb restriction of dc-dc boost converter: A current replication circuit that avoids the LEB period restriction of a DC-DC boost converter. The DC-DC boost converter regulates an output voltage by switching an input voltage through an inductor and a diode using a switch controller employing current feedback control and providing a PWM signal to control a...

20050280403 - Mosfet drive circuit, programmable power supply and semiconductor test apparatus: In a programmable power supply used in a semiconductor test apparatus, high-speed switching of a large current in a current rage or an output relay is enabled. In a MOSFET drive circuit 22 of a switch portion 20 provided in a programmable power supply 10 of a semiconductor test apparatus...

20050280405 - Apparatus and method for improving electromagnetic compatibility: A method and apparatus for providing improved electromagnetic compatibility between a power source (20) and a switching element (22) in a switched mode power supply includes a device (24) for measuring an electrical variable, for example current, that fluctuates as the switching element (22) switches power received from the power...

20050275387 - Method and apparatus for reducing input supply ripple in a dc-dc switching converter: A power system comprising a front end regulator coupled to an input supply voltage (Vin) and providing a regulated input supply voltage (Vbp). The front end regulator compares the input supply voltage (Vin) and the regulated input supply voltage (Vbp) and maintains a substantially constant voltage difference between the input...

20050275388 - Circuit and method for controlling dc-dc converter: A control circuit for suppressing generation of inrush current during activation of a DC-DC converter, which controls output with control signals. The control circuit includes first and second error amplification circuits, each of which generates a control signal based on the difference between a reference voltage and voltage derived from...

20050275390 - Apparatus and methods for regulated voltage: An electronic system according to various aspects of the present invention includes a memory and a supply regulation circuit having a regulated output to provide a selected voltage level. In one embodiment, the supply regulation circuit includes a reference voltage circuit connected to the supply and configured to receive a...

20050275391 - Power supply apparatus provided with overcurrent protection function: A series regulator for outputting a regulated voltage and a booster circuit of a charge pump type for outputting an output voltage by boosting the regulated voltage are connected in series. The series regulator is controlled so that the output voltage is maintained constant. A main circuit current of the...

20050275389 - Voltage level translator circuitry: Circuitry and methods for implementing voltage level translators at relatively low source voltages are provided. The circuitry and methods utilize voltage protection circuitry to ensure that voltages in the circuitry do not exceed predetermined thresholds that, if exceeded, would cause malfunction. In one embodiment of the invention, voltage level translation...

20050275392 - Boost converter: A DC to DC converter for converting an input DC voltage to an output DC voltage. The DC to DC converter may include at least one switch, an inductor coupled to the at least one switch, and a controller capable of providing a control signal. The at least one switch...

20050275393 - Analog current sense circuit: Circuits and related methods for switched step-down and boost DC-to-DC converters have been achieved. Said DC-to-DC converters comprise an inductor current sensing and limiting circuit to prevent the inductor current to exceed a defined limit. Said current sense circuit is using the voltage on the on-state source-to-drain resistance of a...

20050275394 - Current-limiting circuitry: A field effect transistor (FET) driver circuit includes an error amplifier for providing a FET control signal and a current limiting amplifier for preventing excessive current flow through the FET. The current limiting amplifier generates an overcurrent signal when an excessive current is detected. In response to the overcurrent signal,...

20050269997 - Switching power source apparatus and power factor corrector: A power factor corrector is connected to an AC power source, to provide a first DC voltage. A DC-DC converter supplies the first DC voltage from the power factor corrector to a primary winding of a transformer. A first rectifying/smoothing circuit rectifies and smoothes a voltage generated by a secondary...

20050269998 - Dc-ac converter and controller ic therefor: A semiconductor switch circuit is connected to a primary winding of a transformer having a secondary winding connected to a load. The semiconductor switch circuit has switches controlled by PWM to provide a controlled constant current. In the inventive inverter, constant current control is performed by PWM operation of the...

20050269999 - Real-time voltage detection and protection circuit for pfc boost converters: A circuit for protection of the operation of power factor correction (PFC) converters from conditions such as input voltage surges that can otherwise cause failure, and to prevent unnecessary down time of the boost converter after a power failure or on startup. The circuit detects the real time rectified input...

20050270000 - Single-stage buck-boost inverter: An improved Single-Stage Buck-Boost inverter (S2B2 Inverter) is provided, using only three or four power semiconductor switches and two coupled inductors in a flyback arrangement. The inverter can handle a wide range of dc input voltages and produce a fixed ac output voltage. The inverter is well suited to distributed...

20050270001 - Soft switching high efficiency flyback converter: DC-DC converters such as flyback converters achieve self-regulation by communication information between primary and secondary circuits through the power transformer. Operating in accordance with a generalized concept or algorithm, the converter can be bi-directional and self-regulating. Control of the turn OFF times of semiconductor switches in first and second circuits...

20050270002 - Apparatus for converting dc power and method of the same: 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...

20050270004 - Dc-dc cmos converter: A DC-DC CMOS converter including when the supply voltage is low, the current limit is automatically reduced to the maximum possible value that maintains the comparator operative, rather than simply switching off the converter....

20050270003 - Modulated reference voltage control for current mode switching regulators: A method for controlling a switching power regulator uses a function of two voltages to dynamically adjust the regulator's duty cycle. The first voltage VFB corresponds to the output current of the regulator. The second voltage is an independently generated modulated reference voltage VREF. A clock signal causes the regulator...

20050270005 - Method and apparatus for determining load current in a cpu core voltage regulator: An apparatus and method for measuring output current and power in real-time is provided for a CPU core powered by a DC-to-DC power converter having active voltage positioning. In an embodiment of the invention, a switched mode power converter comprises at least one power switch operatively coupled to an input...

20050270006 - System and method for providing digital pulse width modulation: A pulse width modulation system for use in a switching power supply circuit provides high-resolution pulse width modulated signals. The pulse width modulation system is configured to receive a control signal comprising a (m+n)-bit binary word and to provide a pulse width modulated signal with a predetermined average duty cycle...

20050270007 - Simplified adaptive control method for power converters: Adaptive control method for regulating the output voltage or current of converters by causing the input current of the converter to be directly proportional to its output current (or respectively its output voltage) and inversely proportional its input voltage. In cases where the input voltage varies slowly or it is...

20050270008 - Adaptive dual-slope frequency controller for adjusting power conversion: This specification discloses a adaptive dual-slope frequency controller for adjusting power conversion of a power supply. The converter can adjust its operating frequency according to the status of a load device. A feedback voltage, representing the load status, is used to control two pairs of charging/discharging currents of a storage...

20050270009 - Display device: In a liquid crystal display module which includes a first display panel and a second display panel, it is possible to reduce a voltage drop attributed to the line resistance of a drive voltage supplied to the second display panel without increasing the cost. For this purpose, the first display...

20050270011 - Temperature sensor: A temperature sensor comprises (a) a first voltage generating circuit that generates and outputs a first voltage having a positive or negative temperature coefficient in proportion to the absolute temperature; (b) a second voltage generating circuit that generates a second voltage having an opposite sign of temperature coefficient compared to...

20050270010 - Voltage-controlled current source capable of controlling output current by a wide range of control voltage: A voltage-controlled current source includes an FET mirror connection circuit in which a gate and a drain of a first FET are connected to each other and a gate of a second FET is commonly connected to a connection point between the gate and the drain of the first FET;...

20050264267 - An inverter and a drive system using the inverter: A inverter has a switching device for switching DC to change it to AC, and a bipolar type rechargeable battery connected to the switching device in parallel or in series for smoothing the current from the switching device....

20050264268 - Power supply system for a vehicle: In a power supply system for a passive safety device, a step-up circuit steps up an input voltage based on a supply voltage from a battery to obtain a predetermined output voltage. An input voltage detecting circuit detects the input voltage. An output voltage changing circuit changes the output voltage...

20050264269 - Dual controlled output voltage, anti-saturation, auto-transformer circuit methodology: An apparatus for selectively stepping up/down the voltage applied from an input to any load in an alternating current power system. The apparatus comprising an auto transformer having a series winding with a plurality taps for the selection of different output load voltages and a common winding. The series winding...

20050264270 - Dc to dc converter producing output voltage exhibit rise and fall characteristics independent of load thereon: A direct-current to direct-current conversion (DC/DC) apparatus includes a control circuit having an error amplifier for voltage control, basing the conversion on a pulse width modulation control using an output of the error amplifier. The error amplifier inputs a voltage signal corresponding to an output voltage of a DC/DC result...

20050264272 - Method for driving pulse-width-controlled inductive loads, and a drive circuit for this purpose: When a switch (20) that is in series with the inductive load (10) is turned on, the rise behavior of the current (I) is first of all detected until a nominal value (Iref) is reached, and a pulse duty factor (Te/Ta) of a pulse width modulator device (30) is determined...

20050264271 - Single inductor multiple-input multiple-output switching converter and method of use: A single inductor multiple-input multiple-output (SI-MIMO) switching converter time-multiplexes different input power sources through only one inductor to provide multiple regulated output voltages, which can be used to power up different blocks of a portable electronic device (or whatever else it is used for) and at the same time to...

20050264273 - Balun transformer and low-pass filter: A mode-switching transformer, combined with a differential low-pass filter, including a first planar winding in a first conductive level having an external end terminal defining a common-mode input/output terminal; a second planar winding electrically in series with the first winding and formed in a second conductive winding; at least one...