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...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 8098503 | Method and apparatus to control a power converter having a low loop bandwidth A power converter controller is disclosed. An example power converter controller includes a feedback sensor circuit coupled to receive a feedback signal representative of an output of the power converter. The controller also includes a feedback sampling signal gener... | 01/17/2012 |
| 8081496 | Method and apparatus for limiting maximum output power of a power converter An example power converter includes an energy transfer element, a switch, a controller, and a current offset circuit. The controller is coupled to switch the switch between an ON state and an OFF state to regulate the output of the power converter. The controller is... | 12/20/2011 |
| 7898826 | Method and apparatus for limiting maximum output power of a power converter An example power converter includes a power switch, a controller, and a current offset circuit. The controller is coupled to switch the power switch between an ON state and an OFF state to regulate an output of the power converter. The controller is adapted to termi... | 03/01/2011 |
| 7639517 | Adaptive output current control for switching circuits System and methodology for controlling output current of switching circuitry having an input circuit and an output circuit electrically isolated from each other. A value of the output current may be determined based on input voltage, input current and reflected outp... | 12/29/2009 |
| 7468896 | Drive circuit for a switch in a switching converter A drive circuit for activating a switch in a switching converter, which has output Terminals for providing an output voltage, and in which a feedback signal that varies with the output voltage is available. The drive circuit comprises: a capacitive storage element, ... | 12/23/2008 |
| 7426121 | Output voltage detection circuit, isolated switching power supply, and semiconductor device An output voltage detection circuit is provided for accurately detecting a secondary side output voltage based on a voltage induced to an auxiliary winding in an isolated switching power supply including a transformer having the auxiliary winding. A voltage waveform... | 09/16/2008 |
| 7405954 | Method and apparatus for conditional response to a fault condition in a switching power supply Techniques are disclosed to regulate an output of a power converter. One example power converter controller circuit includes a line sense input to be coupled to receive a signal representative of an input voltage of a power converter. A feedback input is included an... | 07/29/2008 |
| 7400126 | DC regulated power supply having voltage correction In a DC regulated power supply realized as AC adapter or the like by a switching power supply, a reference voltage correction circuit, which estimates a voltage drop corresponding to a load current, corrects to increase an output voltage by changing a feedback refer... | 07/15/2008 |
| 7400064 | DC/DC power converter A switching regulation system and control scheme efficiently enables driving multiple loads from a common energy storage element, such as an inductor. The control scheme operates to store energy in the energy storage element over a first portion of a cycle, such as ... | 07/15/2008 |
| 7391627 | Power converter A power converter comprises an inductor (LP) and a controllable switch (CF) coupled to the inductor. A switch controller (1) supplies a periodic switching signal (VC1) which has a repetition time and a duty cycle to the controllable switch (CF) to gene... | 06/24/2008 |
| 7382062 | Wide voltage range stabilized switching power supply for valve actuators The invention finds application in the field of power supplies for valve actuators, and particularly relates to a wide voltage range stabilized switching power supply for valve actuators, of the type that comprises a filter 2, a diode bridge 3, an arra... | 06/03/2008 |
| 7369420 | Control circuit for isolated forward DC-to DC converters An isolated DC-to-DC converter comprises a converter section configured to receive an input voltage and produce an isolated output voltage and a controller section configured to control the operation of the converter section to maintain the output voltage at a prede... | 05/06/2008 |
| 7369418 | Method and apparatus for a switch mode power supply that generates a high pulse width modulation gain while maintaining low noise sensitivity A power supply with high pulse width modulation gain and low noise sensitivity has been disclosed. In one embodiment, a power supply includes a regulator circuit controlling a power switch. The regulator circuit includes a control input that receives a current, whic... | 05/06/2008 |
| 7362083 | DC-DC converter with modulator circuit having a feed forward structure A DC-DC converter with an inductor connected in series with a power transistor between first and second terminals of a DC supply source, and with a modulator circuit that has a control output connected to a control gate of the power transistor. The modulator circuit... | 04/22/2008 |
| 7345895 | Adaptive multi-level threshold system and method for power converter protection System and method for protecting a power converter. The system includes a compensation system configured to receive an input signal and generate a control signal, a cycle threshold generator configured to receive the control signal and generate a cycle threshold, an... | 03/18/2008 |
| 7342392 | Switching regulator with slope compensation independent of changes in switching frequency Compensation for a switching regulator is attained by developing a compensation signal for a switching regulator that is independent of changes in the switching frequency. The regulator operational frequency is established in accordance with a repetitive ramp signal... | 03/11/2008 |
| 7339802 | DC-AC converter and controller IC therefor An inventive inverter has a semiconductor switch circuit connected to the primary winding of a transformer. The semiconductor switch circuit is respectively controlled by PWM to supply a constant current to the load connected to a secondary winding of the transforme... | 03/04/2008 |
| 7330365 | Synchronous commutation DC-DC converter A synchronous commutation DC-DC converter comprises a current detection transformer (51) for detecting currents (IQ1, IQ2) flowing through the primary circuit, first and second DC bias power sources (53, 54) generating bias voltag... | 02/12/2008 |
| 7315162 | Reducing power consumption of electrical meters The invention contemplates an electrical power meter and method of operating the electrical power meter. The inventive power meter includes a power supply for converting alternating current (AC) voltage to a direct current (DC) voltage for powering the electronic co... | 01/01/2008 |
| 7310475 | Motor driving apparatus A motor driving apparatus is provided which can minimize ripple current flowing through a DC link capacitor, and downsize the motor driving apparatus. It synchronizes the frequency of the inverter carrier signal for driving an inverter with the frequency of the DC/D... | 12/18/2007 |
| 7298632 | Secondary current compensation method Techniques for correcting for internal resistance losses in the secondary windings of a transformer to reduce errors in output voltage from a high voltage power supply. ... | 11/20/2007 |
| 7295451 | Switching power supply having dual current feedback An arrangement for use in a switching power supply includes a power supply output line, a current sensing circuit, and a feedback circuit. The output line is operably coupled to an output winding of a transformer. The transformer has a first winding operably connect... | 11/13/2007 |
| 7288991 | Power control circuit for accurate control of power amplifier output power According to an exemplary embodiment, an amplification module includes a power control circuit. The amplification module further includes a power amplifier coupled to the power control circuit and configured to draw a supply current and receive a supply voltage from... | 10/30/2007 |
| 7274575 | AC coupled bias circuit for power converters A switching power system for converting an input voltage to an output voltage across a transformer is disclosed. The system includes a control circuit. The control circuit has a control input coupled for receiving the output voltage and an output coupled to a primar... | 09/25/2007 |
| 7272018 | Switching power supply device and method for controlling switching power supply device By an NMOS (22) being switched on or off, a direct-current voltage E0 is charged in a capacitor (24), and a DC/DC converting circuit (30) charges a direct-current output voltage V0 to be supplied to a load L in a capacitor ... | 09/18/2007 |
| 7259973 | Semiconductor apparatus for controlling a switching power supply In a semiconductor apparatus for controlling a switching power supply including a switching element and a switching operation control circuit, the switching operation of the switching element is controlled as follows: a comparison is made between an output voltage o... | 08/21/2007 |
| 7245510 | Method and apparatus for conditional response to a fault condition in a switching power supply Techniques are disclosed to regulate an output of a power converter. One example power converter includes an energy transfer element coupled between an input and an output of the power converter. A switch included in the power converter is coupled to the input of th... | 07/17/2007 |
| 7239533 | DC power supply apparatus A DC power source device comprises a MOS-FET 5 which performs the intermittent switching operation for converting DC input from a DC power supply 1 into high frequency electric power; a control circuit 9 for turning MOS-FET 5 on and off; ... | 07/03/2007 |
| 7236377 | DC-AC converter and controller IC therefor An inventive inverter has a semiconductor switch circuit connected to the primary winding of a transformer. The semiconductor switch circuit is respectively controlled by PWM to supply a constant current to the load. connected to a secondary winding of the transform... | 06/26/2007 |
| 7227350 | Bias technique for electric utility meter The invention contemplates an electrical power meter and method of operating the same, where the meter has electronic components (e.g., a power supply and a voltage sensing circuit) and receives alternating current (AC) voltage from an electrical power line. The inv... | 06/05/2007 |
| 7209372 | Flyback converter with synchronous rectifier Disclosed herein is a flyback converter with a synchronous rectifier which is applied to a power supply of a portable computer such as a notebook PC. The flyback converter is operated in a critical conduction mode to turn on/off a main switch at a zero crossing poin... | 04/24/2007 |
| 7205754 | Method and apparatus for a switch mode power supply that generates a high pulse width modulation gain while maintaining low noise sensitivity A power supply with high pulse width modulation gain and low noise sensitivity has been disclosed. In one example, a control current is received at a control terminal of a regulator circuit. The control current includes a consumption current of the regulator circuit... | 04/17/2007 |
| 7187565 | High voltage power supply A high voltage power supply (HVPS) including an oscillation circuit for generating and outputting an alternating current (AC) voltage using an oscillation of a transformer, and a voltage multiplying circuit for increasing the AC voltage from the oscillation circuit ... | 03/06/2007 |
| 7161783 | Overcurrent protection circuit for switching power supply In an overcurrent protection circuit for a switching power supply having multiple voltage supply sections, an overcurrent in a low voltage supply section is detected to make it possible to take a countermeasure against overload in a transformer winding, using a simp... | 01/09/2007 |
| 7158391 | Switching power supply unit A first side circuit connected to a primary coil of a transformer includes a main switching element driving the primary coil, and a control circuit which detects an output voltage to feedback and drives and controls the main switching element so as to keep constant ... | 01/02/2007 |
| 7116564 | Switching power supply unit and semiconductor device for switching power supply Overload protecting operation is performed by controlling the current peak value of a switching device 1 through the use of a comparator 8, a NAND circuit 5, and so on according to variations in feedback current being input to a feedback signal ... | 10/03/2006 |
| 7110270 | Method and apparatus for maintaining a constant load current with line voltage in a switch mode power supply A power supply including a regulation circuit that maintains an approximately constant load current with line voltage. In one embodiment, a regulation circuit includes a semiconductor switch and current sense circuitry to sense the current in the semiconductor switc... | 09/19/2006 |
| 7099164 | Adaptive multi-level threshold system and method for power converter protection System and method for protecting a power converter. The system includes a compensation system configured to receive an input signal and generate a control signal, a cycle threshold generator configured to receive the control signal and generate a cycle threshold, an... | 08/29/2006 |
| 7095635 | Dc/ac converter and controller IC An inventive inverter has a semiconductor switch circuit connected to the primary winding of a transformer. The semiconductor switch circuit is respectively controlled by PWM to supply a constant current to the load connected to a secondary winding of the transforme... | 08/22/2006 |
| 7092261 | Switching power supply utilizing oscillator frequency tuner for load driving capability under peak load condition A switching power supply including an oscillator frequency tuner to enhance its load driving capability is presented. The oscillator frequency tuner includes a plurality of capacitors connected between a reference voltage output of the switching control circuit and ... | 08/15/2006 |
