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| Number | Title | Issue Date |
| 8107264 | Slope compensation method and circuit for a peak current control mode power converter circuit A slope compensation method and circuit for a peak current control mode power converter circuit is provided. Since the power converter circuit has a synchronous signal of a driven signal of enabling the first primary switch and the second primary switch, a triangula... | 01/31/2012 |
| 7983059 | High frequency power converter based on transformers A transformer-based power conversion system includes a primary coil is provided in a current path that includes a single energy switch. An oscillator is coupled to a control input of the energy switch. The design conserves switch-based losses as compared to prior de... | 07/19/2011 |
| 7426123 | Finite state machine digital pulse width modulator for a digitally controlled power supply A method is disclosed for generating pulse width modulated pulse control signals for controlling switches in a switching power supply. First, a count value is determined of a master clock within a switching cycle of the power supply from beginning to end thereof. A ... | 09/16/2008 |
| 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 |
| 7371963 | Photovoltaic power generation system An object of the present invention is to provide a photovoltaic power generation system which is capable of achieving system linkage of a plurality of solar cell strings having different output voltages to a commercial electric power system with ease, and which enab... | 05/13/2008 |
| 7368691 | Induction heating apparatus Apparatus for providing electrical power to at least one inductor wherein the at least one inductor is disposed to inductively couple the electrical power to an electrically conductive object to heat the electrically conductive object by inducing electrical current ... | 05/06/2008 |
| 7355864 | Switching regulator and its control method A switching regulator has an input voltage detection circuit which inputs a voltage applied to a rectifier diode 7 connected in series with the secondary side of a transformer and generates a voltage signal Vvp corresponding to the voltage, and a calculation ... | 04/08/2008 |
| 7345894 | Cascode switch power supply A switching power supply is disclosed for improving the no-load power drain of low-power mains operated supplies. The power converter utilizes a cascoded switch arrangement with a conventional high voltage power MOSFET and a low voltage, low gate charge MOSFET. Driv... | 03/18/2008 |
| 7342812 | Switch mode power supply systems Methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing are described. A module senses a current in a primary winding of a transformer and a voltage on a primary or auxiliary winding of the transformer, an... | 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 |
| 7336038 | Method and apparatus for single-ended conversion of DC to AC power for driving discharge lamps The present disclosure introduces a simple method and apparatus for converting DC power to AC power, and, specifically, to single-ended inverter circuits for driving discharge lamps such as a Cold Cathode Fluorescent Lamp (CCFL) or an External Electrode Fluorescent ... | 02/26/2008 |
| 7333142 | Power supply apparatus and actuator control apparatus In accordance with the switching operation of a switching section, current is made to flow from a battery to an inductor repeatedly. A voltage generated at the inductor is smoothed by a condenser and then input to a regulator. A D/A converter within a CPU monitors t... | 02/19/2008 |
| 7327178 | Timing control circuit for lossless switching converter A timing control circuit (70) generates staggered signals from a pulse width modulated signal (68) providing lossless switching in a DC to DC power converter (10). The DC to DC power converter (10) comprises two input MOSFET switches (... | 02/05/2008 |
| 7313005 | 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 ... | 12/25/2007 |
| 7312783 | Light emitting element drive device and display apparatus A light emitting element drive circuit and a display system able to simultaneously perform constant current control and PWM control and able to perform a stable adjustment of luminance over a wide dynamic range, including a constant voltage source having an output v... | 12/25/2007 |
| 7310247 | Method for controlling transformer excitation cycles and circuit for controlling the same The present invention discloses a method for controlling transformer excitation cycles and a circuit for controlling the same, wherein the excitation cycle and the demagnetization cycle, which determine the rise and fall of the excitation current, are modified to pr... | 12/18/2007 |
| 7289920 | Method and apparatus for capture of grid characteristics corresponding to fluctuation events The techniques described herein allow a wind turbine generator system to automatically capture voltage waveform data corresponding to a voltage disturbance event. Data corresponding to a period preceding the voltage disturbance event, during the event and a period o... | 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 |
| 7265525 | Self-driven scheme for synchronous rectifier having no body diode A voltage converter uses a component such as a JFET or four-terminal power MOSFET having no body diode and exhibiting no body diode conduction characteristic as a synchronous rectifier to reduce switching losses and body diode conduction losses and to support high f... | 09/04/2007 |
| 7259948 | Power supply device for driving A power supply device for driving has a switching control circuit that switches a switching element for a power source, and an output voltage generation portion that generates a predetermined output voltage in accordance with the switching of the switching element f... | 08/21/2007 |
| 7251146 | Direct-current converter having active clamp circuit Provided is a direct-current converter which can reduce power consumption at light load by reducing switching losses of a main switch. The direct-current converter is provided with: a first serial circuit which is connected to both ends of a direct current power sup... | 07/31/2007 |
| 7247955 | PWM power supplies using controlled feedback timing and methods of operating same A closed loop power converter circuit of a UPS or other power supply includes a pulse width modulator circuit in a forward path of the closed loop power circuit. A compensation circuit provides pulse width commands to the pulse width modulator at a first rate. A fee... | 07/24/2007 |
| 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 |
| 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 |
| 7236337 | Drive power supply and fail determination method A drive power supply for generating inverter drive voltages has a switching control circuit that switches a switching element on a primary side of a transformer to generate drive voltages on the secondary side in connection with the switching of switching elements o... | 06/26/2007 |
| 7233112 | PWM switching power supply control methods The solid state switching section of a high frequency PWM switching power supply may encounter problems in accurately regulating output power when the requested output power is above a threshold level, the threshold level typically being a high level approaching one... | 06/19/2007 |
| 7233504 | Method and apparatus for digital control of a switching regulator Various techniques directed to the digital control of a switching regulator are disclosed. In one aspect, a method for regulating an output level at a power converter output includes receiving a feedback signal representative of the output level at the power convert... | 06/19/2007 |
| 7227762 | Fine-tuning circuit for the winding voltage of a transformer A fine-turning circuit is used for adjusting the output voltage of a main transformer in an electrical power convert device and solving the problem of turns granularity of conventional transformers. The fine-turning circuit includes an auxiliary transformer having a... | 06/05/2007 |
| 7221111 | Switching power supply device and method of controlling the switching device According to one embodiment, the switching power supply device comprises a DC-DC converter, an alternating current driver circuit, a smoothing capacitor and control circuitry. The control circuitry operates for adjusting a phase of an oscillation signal from the alt... | 05/22/2007 |
| 7206209 | Switching power supply apparatus with error amplification control A switching power source device can enhance the power factor by increasing the conduction angle of an input current in a wide input voltage range, while obviating the increase of size and the increase of cost thereof, and lower the switching loss by removing higher ... | 04/17/2007 |
| 7199643 | Hot swappable pulse width modulation power supply circuits Hot swappable pulse width modulation power supply circuits preferably realized in integrated circuit form. The hot swap circuits provide for de-bouncing, controlled charging of the input capacitor of the power supply circuit and soft-start of the pulse width modulat... | 04/03/2007 |
| 7187564 | Switching power supply unit A switching power source apparatus has a series circuit connected to both ends of a DC power source Vdc1 and having a reactor L3, a primary winding 5a of a transformer T, and a switch Q1, a series circuit connected to both ends of ... | 03/06/2007 |
| 7170762 | Low voltage DC-DC converter A direct current to direct current voltage converter (DC-DC converter) in accordance with the invention comprises a transformer coupled with a voltage source and a self-starting oscillator that includes a secondary winding of the transformer, a capacitor; and a firs... | 01/30/2007 |
| 7151659 | Gapped-plate capacitor In a semiconductor device, a capacitor is provided which has a gap in at least one of its plates. The gap is small enough so that fringe capacitance between the sides of this gap and the opposing plate at least compensates, if not overcompensates, for the missing co... | 12/19/2006 |
| 7151680 | Switching power supply circuit and frequency converter An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the receiving voltage is high and thereby provide a small and inexpensive... | 12/19/2006 |
| 7142401 | Detecting overcurrents in a switching regulator using a voltage dependent reference A switching regulator provides energy to an inductor-capacitor combination that supply a DC voltage as an output. The presence of a current that can be significantly lower than the typical load current is detected using a pulse signal that provides a measure of the ... | 11/28/2006 |
| 7120492 | Flyback transformer wire attach method to printed circuit board A method of forming a surface mount transformer. The method comprises winding insulated wire around a magnetic core to form at least one secondary transformer coil, winding insulated wire around the magnetic core to form at least one primary transformer coil, attach... | 10/10/2006 |
| 7113413 | Control circuit with tracking turn on/off delay for a single-ended forward converter with synchronous rectification In a converter-controller the controller includes a primary power device coupled to a primary coil and a resonant reset capacitor in parallel with the primary power device. The controller can switch the primary power device with a variable frequency. The resonant ca... | 09/26/2006 |
| 7106037 | Switching-type constant current power supply device Disclosed is a switching-type constant current power supply, which comprises an alteration circuit 9 provided on the output side of a power conversion circuit 3 together with a voltage detection circuit 7, and a feedback circuit 8 provide... | 09/12/2006 |
| 7102899 | Control circuit for switched mode power supply unit The present invention relates to a control circuit for controlling the output power of a primary-controlled switched mode power supply unit, which comprises a primary switch and a transformer with an auxiliary winding. Within the auxiliary winding, voltage pulses ar... | 09/05/2006 |
