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| Number | Title | Issue Date |
| 8169803 | Power transistor chip with built-in junction field effect transistor and application circuit thereof A power transistor chip and an application circuit thereof have a junction field effect transistor to act as a start-up circuit of an AC/DC voltage converter. The start-up circuit can be turned off after the PWM circuit of the AC/DC voltage converter operates normal... | 05/01/2012 |
| 8169802 | Switch controller of a converter with a soft start signal generator comprising a plurality of current sources Disclosed are a switch controller, a switch control method, a converter using the same, and a driving method thereof. A first voltage is generated by using a voltage that is input to an input terminal, and a soft start signal is generated by using the first voltage ... | 05/01/2012 |
| 8159842 | Power converter The present invention discloses a power converter with extremely low standby power consumption for converting an input AC power to an output DC power, comprising: a DC supply voltage generating unit, used for generating a DC supply voltage; a pulse width modulation ... | 04/17/2012 |
| 8149602 | Method and apparatus for detecting end of start up phase A PSE configured to determine the end of the start up phase at the PD responsive to a condition of the voltage at the PSE output. In one particular embodiment, the startup phase end is determined responsive to a PSE output voltage within a predetermined range of the... | 04/03/2012 |
| 8116106 | Method and apparatus to select a parameter/mode based on a measurement during an initialization period Techniques are disclosed to select functional parameters and/or operating modes of a circuit based on a measurement during an initialization period. In one aspect an integrated circuit includes a threshold detection circuit coupled to measure during an initializatio... | 02/14/2012 |
| 8111529 | Over current protection circuit and power converter using the same An over current protection circuit and a power converter using the same. The over current protection circuit includes a soft start cell and an operational amplifier. The soft start cell outputs a soft start signal according to a direct current (DC) level, and the so... | 02/07/2012 |
| 8072783 | Input circuit for a switch-mode power supply The invention relates to an input circuit for a logic circuit part, comprising a voltage converter component for conversion of a mains voltage to the required low voltage in order to supply a user with a low voltage. The supply to the input circuit may hence be conn... | 12/06/2011 |
| 8050062 | Method and system to allow for high DC source voltage with lower DC link voltage in a two stage power converter A system for supplying AC power from a DC power source, such as a photovoltaic array is disclosed. The system includes a converter and an inverter coupled by a DC link. Control methods and systems are provided to maintain the DC source voltage and the DC link voltag... | 11/01/2011 |
| 8045348 | Switching mode power supply controller with high voltage startup circuits A controller for a switching mode power supply includes two semiconductor chips. The first semiconductor chip has a high-voltage startup transistor coupled to a high voltage supply input terminal and configured to provide a charging current in a startup phase or pro... | 10/25/2011 |
| 8031494 | Method and apparatus for providing an initial bias and enable signal for a power converter The invention relates to a switch-mode power converter including a bias circuit. A power converter power transformer includes a magnetic core. The switch-mode power converter power transformer also includes an initial bias primary winding and an initial bias seconda... | 10/04/2011 |
| 7974110 | Switching power supply unit and method for setting switching frequency A switching power supply unit is provided which provides improved response for frequency switching with a smooth rise in voltage. The switching power supply unit includes: a rectifier circuit for rectifying an alternating current from an AC power source into a direc... | 07/05/2011 |
| 7957165 | DC-DC converter with a plurality of soft-start control circuits A DC-DC conversion circuit is configured by including a plurality of control signal generation circuits, a plurality of soft-start control circuits, and a start control circuit. The plurality of control signal generation circuits correspond to the plurality of contr... | 06/07/2011 |
| 7948780 | Semiconductor device for switching power supply control, startup circuit, and startup method for switching power supply device A semiconductor device for switching power supply control limits the startup current supplied from a high-voltage input terminal, and prevents heat generation and combustion in case of an anomaly. A high-voltage input terminal is connected to the main winding of a t... | 05/24/2011 |
| 7924581 | High voltage start-up circuit with constant current control A high voltage start-up circuit with constant current control applied to a switching mode power converter is provided. The high voltage start-up circuit includes a high voltage junction transistor, a control transistor, a current detecting resistor and a bias resist... | 04/12/2011 |
| 7898830 | System and method of controlling the soft start control voltage of switching regulator in response to output current sensing An apparatus, such as a Buck converter system, for generating an output voltage while at the same time monitoring whether an overload or over current condition occurs at the output, and protecting the system if the overload or over current condition occurs. The appa... | 03/01/2011 |
| 7894219 | Method and apparatus of low current startup circuit for switching mode power supplies A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a startup mode to a normal operation mode when an input supply voltage exceeds a first threshold voltage, a curren... | 02/22/2011 |
| 7864551 | Power supply device with system switch circuit A power supply device with a system switch circuit includes a primary power system, a stationary power system and a power management unit. The power management unit is triggered by a remote ON/OFF signal to generate a bias voltage power for turning on the primary po... | 01/04/2011 |
| 7852642 | Full digital soft-start circuit and power supply system using the same A full digital soft-start circuit adapted for a power supply system is provided. The full digital soft-start circuit includes a ring oscillator, a pulse generator, a counter, and a multiplexer. The ring oscillator generates a plurality of clock signals which are dif... | 12/14/2010 |
| 7830683 | Current control type converter A current control type converter has a converter section and a control section that includes three controllers. A first controller calculates and outputs an active current instruction value by proportional-plus-integral control to perform proportional integration of... | 11/09/2010 |
| 7826238 | Power system inhibit method and device and structure therefor A power control system (25) uses two separate currents to control a startup operation of the power control system (25). The two currents are shunted to ground to inhibit operation of the power control system (25) and one of the two currents is d... | 11/02/2010 |
| 7782637 | Switched-mode electronic power device An electronic power device for controlling a load includes: a high-voltage integrated switch having an output terminal to be connected to the load; an integrated, and low-voltage driving circuit for driving the switch, and a start-up integrated circuit comprising a ... | 08/24/2010 |
| 7764522 | Circuit and method for controlling the start-up cycle of a power supply The present invention discloses a method and a circuit for controlling a start-up cycle of an integrated circuit in a circuit system. The method and circuit determine whether or not an input power of the circuit system and a bias voltage power of the integrated circ... | 07/27/2010 |
| 7719863 | Active start judgment circuit An active start judgment circuit is electrically connected to an AC/DC transforming power supply which has at least one standby power unit to transform AC to DC in regular conditions and a main power unit to transform the AC to the DC in an ON condition for operatio... | 05/18/2010 |
| 7688606 | Power supply control device and precharge processing method Upon receiving a start instruction, a control device turns on first and third system main relays, and performs precharge processing for charging a capacitor. Here, a limiting resistor for preventing an inrush current into the capacitor in a discharged state at the t... | 03/30/2010 |
| 7667989 | Method for controlling start time series by stages A method for controlling start time series by stages adopted for use on a power supply consisting of a main power system and a standby power system. The power supply includes an energy storage unit to store a judgment power. The method mainly includes: setting a sta... | 02/23/2010 |
| 7652898 | Soft start circuit and power supply including soft start circuit A soft start circuit is connected to a pulse width modulation controller including an oscillator, and a functionality of modulating amplitude to a pulse width and a power supply includes the soft start circuit. The soft start circuit includes a frequency controlling... | 01/26/2010 |
| 7623361 | Power supply soft start controller with no output voltage undershoot when transitioning from skip cycle mode to normal mode In one embodiment, a power supply controller is configured to reset or override a soft-start reference signal responsively to the output voltage decreasing to a value that is less than a desired regulated value of the output voltage. ... | 11/24/2009 |
| 7570501 | DC-DC converter with capacitor precharging and duty ratio limiting In a DC to DC converter, first and second primary windings are magnetically coupled to a first secondary winding. Third and fourth primary windings are magnetically coupled to a second secondary winding. The first and second primary windings are magnetically coupled... | 08/04/2009 |
| 7545657 | Switching power source apparatus A switching power source apparatus includes a switching element connected through a primary winding of a transformer to a DC power source, a start circuit for a control circuit, a rectify-smooth circuit of a voltage of a secondary winding of the transformer, and a r... | 06/09/2009 |
| 7511975 | System and method for limiting AC inrush current A system for limiting AC inrush current to a power supply. The system comprises first, second, and third windings magnetically coupled to a core of a transformer of the power supply. The system also comprises a first low-voltage contactor and a second low-voltage co... | 03/31/2009 |
| 7486529 | Switching power supply controller with improved efficiency and method therefor In one embodiment, a switching power supply controller decouples the power supply controller from receiving a sense signal during one portion of the operation of the power supply controller and couples the switching power supply controller to receive the sense signa... | 02/03/2009 |
| 7477532 | Method of forming a start-up device and structure therefor In one embodiment, a start-up controller for a PWM power supply controller is formed to generate a current that is substantially constant for changes in temperature and for changes in an output voltage received by the start-up controller. ... | 01/13/2009 |
| 7474544 | Initial voltage establishing circuit for a switching voltage converter An initial voltage establishing circuit has a current supplying circuit, a current adjusting circuit, a charge/discharge control circuit, and an oscillating signal generating circuit. The current supplying circuit provides a charge current and a discharge current. T... | 01/06/2009 |
| 7466571 | 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... | 12/16/2008 |
| 7443702 | High voltage start up circuit for power converters A start up circuit for power converters is presented. It includes a JFET transistor, a resistive device, a first transistor, a second transistor and a diode. The JFET transistor is coupled to a voltage source. The first transistor is connected in serial with the JFE... | 10/28/2008 |
| 7430131 | Start-up circuit for providing a start-up voltage to an application circuit A startup circuit for providing a startup voltage from a high voltage DC bus voltage to an application circuit including an integrated circuit package for at least a control circuit for driving at least one power switch of the application circuit; a dropping resisto... | 09/30/2008 |
| 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 |
| 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 |
