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| Number | Title | Issue Date |
| 7423888 | Voltage conversion circuit and switching power supply device A voltage conversion circuit and a switching power supply device achieving both a good response and a low loss of a power supply voltage, wherein a main voltage conversion portion (circuit block) for conversion an AC voltage to a DC voltage, an auxiliary voltage con... | 09/09/2008 |
| 7417878 | Distributed power supply and method of recovering from error A distributed power supply is incorporated in a device including a plurality of PCB. An on-board power supply is provided in the distributed power supply. The on-board power supply individually supplies a secondary power to each PCB using a primary power. Each PCB i... | 08/26/2008 |
| 7417416 | Regulator with load tracking bias An electrical circuit that provides accurate, regulated output voltage over a wide range of input voltages, while exhibiting each of three desired characteristics: accuracy across different supply/process/temperature; stability and linearity yielding phase/gain marg... | 08/26/2008 |
| 7417877 | Digital power supply with programmable soft start A system for controlling a soft start for a switching power converter includes a digital controller that enables the programming of a plurality of input voltage profiles during a soft start condition of the switching power converter. The programming of the plurality... | 08/26/2008 |
| 7408792 | Inverter and inverter driving method for enabling soft start of a load An inverter and inverter driving method enable slow start of a load by gradually increasing the lamp current within a range less than a predetermined maximum level, thereby preventing improper operation of the inverter. The inverter includes a transformer for conver... | 08/05/2008 |
| 7405549 | Soft start circuit, power supply unit and electric equipment A soft start circuit includes a constant current source for generating a constant current, a first current mirror circuit for generating from the constant current a first mirror current, a second current mirror circuit for generating from the constant current a seco... | 07/29/2008 |
| 7391187 | Regulator with load tracking bias An electrical circuit that provides accurate, regulated output voltage over a wide range of input voltages, while exhibiting each of three desired characteristics: accuracy across different supply/process/temperature; stability and linearity yielding phase/gain marg... | 06/24/2008 |
| 7388423 | Start-up circuit with folding current arrangement A start-up circuit includes a long channel current generator, a subtracting reference current generator, and a gain scaling current mirror-circuit. The long channel current generator circuit uses a long channel transistor circuit that simulates a high value resistor... | 06/17/2008 |
| 7372321 | Robust start-up circuit and method for on-chip self-biased voltage and/or current reference A reference circuit can include a reference section that provides a reference value for other circuits of an integrated circuit and can be enabled and disabled in response to an enable signal. The reference circuit can include at least a first node, draw a reference... | 05/13/2008 |
| 7368899 | Configuration and controlling method of boost circuit having pulse-width modulation limiting controller The proposed boost circuit includes a DC/DC converter having a switch, receiving an input voltage and outputting an input voltage feedback signal, an output voltage feedback signal, an input current feedback signal and an output voltage after a boost of the input vo... | 05/06/2008 |
| 7352162 | PWM boost system and start-up method thereof A PWM (pulse width modulation) boost system includes a boost circuit, a voltage dividing circuit, a comparator, a PWM circuit, a pre-oscillator, and a current limit circuit. A start-up method of the PWM boost system includes (1) providing an error voltage; (2) gener... | 04/01/2008 |
| 7345449 | Method of rotating a polyphase motor at less than rated speed A polyphase AC induction motor is connected to a power supply through a soft starter having three sets of inverse parallel connected silicon controlled rectifiers with each set corresponding to one particular phase. Low speed starting and operation of the motor can ... | 03/18/2008 |
| 7345458 | Booster that utilizes energy output from a power supply unit A booster circuit generates a boosted output by boosting a low voltage output supplied as a target to be boosted and feeds back a part of the boosted output, an output by the booster circuit itself, to the booster circuit as operation energy. An auxiliary booster ci... | 03/18/2008 |
| 7323856 | Power efficient startup circuit for activating a bandgap reference circuit A power efficient startup circuit for activating a bandgap reference circuit is disclosed. The startup circuit uses a voltage supply having a voltage level to initiate the flow of a startup current used to activate the bandgap reference circuit. When the bandgap ref... | 01/29/2008 |
| 7312601 | Start-up circuit for a current generator A circuit includes a current generator, a start-up circuit coupled to provide a start-up current to the current generator during a start-up phase of the current generator, and a cut-off circuit coupled to both the current generator and to the start-up circuit to pro... | 12/25/2007 |
| 7304460 | Smart start-up circuit for switching regulators The smart start-up circuits basically include a sensor, two stacked PMOS transistors, two stacked NMOS transistors, and a feedback line. If the sensing voltage does not reach the expected voltage compared to the midpoint voltage of the sensor, the output voltage of ... | 12/04/2007 |
| 7304456 | Input inrush current control and/or output short-circuit control to a boost converter in a power supply An electronic circuit is connected between input lines of an alternating input power supply and input lines of a boost converter to limit an input inrush current and/or an output short-circuit current supplied to the boost converter in a power supply. The electronic... | 12/04/2007 |
| 7269036 | Method and apparatus for adjusting wakeup time in electrical power converter systems and transformer isolation An electrical power converter system adjusts a wakeup voltage periodically, to permit earlier connection and/or operation, to increase performance. The electrical power converter system selects between a mathematically adjusted wakeup voltage based on at least one p... | 09/11/2007 |
| 7265529 | Zero power start-up circuit An improved start-up circuit and method for self-bias circuits is described that applies a start-up voltage and current to a self-bias circuit to initialize its operation in its desired stable state. Once the self-bias circuit converges to its desired state of opera... | 09/04/2007 |
| 7265528 | High-frequency power apparatus A high-frequency power apparatus including: an oscillator, outputting an oscillating signal, an output level of the oscillating signal being variable; an amplifier, amplifying the oscillating signal output from the oscillator and outputting high-frequency power; a D... | 09/04/2007 |
| 7262582 | Switching power supply circuit and electronic apparatus provided therewith In a switching power supply circuit, completion of discharging of a capacitance provided in a soft-start circuit requires a period longer than a cycle with which an activating/deactivating portion switches switching control operation of a driving portion (which perf... | 08/28/2007 |
| 7257008 | Start-up apparatus for power converters A start-up apparatus for a power supply is presented. A charging path from an input voltage to a holding capacitor is cut off after the power converter starts up. The start-up apparatus includes a transistor having a drain supplied with the input voltage, and a sour... | 08/14/2007 |
| 7221199 | Circuit and method for generating level-triggered power up reset signal A power supply voltage follower connected to a power supply is used for proportionally following an increase of a supply voltage to output a power up reset signal. A pulse generation control circuit coupled to the power supply voltage follower is used for dischargin... | 05/22/2007 |
| 7215108 | Method for starting a voltage-mode switching power supply into a biased load A method for starting up a voltage-mode switching power supply into a biased load includes computing a ratio of the load voltage at the biased load to an input voltage of the switching power supply, generating a first signal indicative of the duty cycle of the volta... | 05/08/2007 |
| 7208929 | Power efficient startup circuit for activating a bandgap reference circuit A power efficient startup circuit for activating a bandgap reference circuit is disclosed. The startup circuit uses a voltage supply having a voltage level to initiate the flow of a startup current used to activate the bandgap reference circuit. When the bandgap ref... | 04/24/2007 |
| 7208927 | Soft start system and method for switching regulator The present invention introduces methods and circuits to provide a soft start for a switching regulator. A feedback voltage from output terminal is monitored and used to regulate the bias current of the regulator's error amplifier. The present invention also enables... | 04/24/2007 |
| 7196502 | Switching regulator having soft start circuit A switching regulator has a soft start circuit having a current source, a capacitor, and a MOS transistor connected between the current source and the capacitor for undergoing controlled operations between ON/OFF states to control a time period required for soft sta... | 03/27/2007 |
| 7186956 | Fuser-controlling apparatus for generating a power synchronization signal and detecting power voltage A fuser-controlling apparatus for generating a power synchronization signal and detecting a power voltage. The fuser-controlling apparatus comprises a power synchronization signal generation circuit for outputting a power synchronization signal for synchronizing fus... | 03/06/2007 |
| 7180757 | Sequential soft-start circuit for multiple circuit channels A first to an n-th current sources supply a first to an n-th charging currents, respectively. A sequence control circuit allows an x-th charging current of the first to the n-th charging currents to charge a capacitor for generating an x-th soft-start signal. The va... | 02/20/2007 |
| 7173404 | Auto-switching converter with PWM and PFM selection An auto-switching converter with PWM and PFM selection supplies a boosted DC power to a load through a power switch unit. A starter outputs a starting-enabling signal. An auto PWM/PFM controller is connected to the starter for outputting a selection signal. A contro... | 02/06/2007 |
| 7161336 | Power supply device and electronic equipment comprising same The present invention provides a power supply device which can suppress a voltage drop of the input power supply immediately after recovery from shutdown status. The power supply device comprises a reference voltage generation circuit for generating reference voltag... | 01/09/2007 |
| 7158394 | Switching power supply circuit with a soft-start function A switching power supply circuit reduces the time from start-up driving to normal operation while a soft-start is carried out with an output voltage Vout. A soft-start capacitor is charged during the start-up time. After a soft-start voltage Vz has reached a predete... | 01/02/2007 |
| 7157892 | Robust ramp controlled enable for voltage regulator A voltage regulator including a bandgap control circuit that maintains the regulator's bandgap voltage at a predetermined voltage level after an externally generated enable signal is de-asserted until the regulated output voltage has dropped below a predetermined lo... | 01/02/2007 |
| 7151365 | Constant voltage generator and electronic equipment using the same A constant voltage generator is comprised of a band gap reference circuit, a current supply circuit, a starting circuit and a voltage-current conversion circuit, and the starting circuit is further comprised of a first and second load elements, a first transistor wh... | 12/19/2006 |
| 7149068 | Circuit for controlling the minimum operating voltage of switching power supply A circuit is provided for controlling a minimum operating voltage of an integrated control circuit of a switching power supply. The circuit includes at least one switch for switching the minimum operating voltage from a first voltage value to a second voltage value ... | 12/12/2006 |
| 7135845 | Drive circuit for a switch in a switching converter and method for driving a switch in a switching converter The present invention relates to a drive circuit for a switch (T) connected to a rectifier arrangement in a switching converter which provides an output voltage (Vout) from an input voltage (Vin), the drive circuit having the following features: | 11/14/2006 |
| 7129679 | Power supply circuit having soft start The voltage booster type switching power supply circuit is provided with a drive circuit for controlling a switching element, a start/stop circuit for turning the drive circuit on and off according to a brightness control signal for adjusting a brightness of a light... | 10/31/2006 |
| 7088600 | Startup via FB pin regulation An apparatus for reducing surge currents during startup of a voltage regulator is disclosed that includes circuitry for maintaining a voltage at an FB pin of the voltage regulator substantially equivalent to an output voltage of the voltage regulator. ... | 08/08/2006 |
| 7078883 | Method and apparatus for starting power converters A startup circuit for starting a power converter for converting an input voltage to an output voltage includes a switch connected in series with a resistive element. The startup circuit is connected in parallel with a trigger switch in the power converter for enabli... | 07/18/2006 |
| 7075804 | Tracking soft start circuit for generating a plurality of soft start voltages where all soft start voltages are prevented until all have been brought to the same prescribed state of operation A tracking soft start circuit architecture contains a plurality of soft start circuits for generating a plurality of soft start voltages during startup for application to associated power supply terminals of a power supply system. The soft start circuits are interco... | 07/11/2006 |
