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| Number | Title | Issue Date |
| 8144484 | Electronic circuit control element with tap element A technique for controlling a power supply with power supply control element with a tap element. An example power supply control element includes a power transistor that has first and second main terminals, a control terminal and a tap terminal. A control circuit is... | 03/27/2012 |
| 7965522 | Low-loss noise-resistant high-temperature gate driver circuits High temperature gate driving circuits with improved noise resistance and minimized loss are implemented with high temperature components with a reduced size magnetic isolation transformer. Input broad-pulse width modulated signals are converted to offsetting narrow... | 06/21/2011 |
| 7636247 | Electronic circuit control element with tap element A technique for controlling a power supply with power supply control element with a tap element. An example power supply control element includes a power transistor that has first and second main terminals, a control terminal and a tap terminal. A control circuit is... | 12/22/2009 |
| 7616458 | PWM current controlling apparatuses capable of optimally correcting load current In a current controlling apparatus for controlling a load current flowing through a load, a reference level generating circuit generates a reference level signal, and a reference signal generating circuit generates a reference signal in accordance with the reference... | 11/10/2009 |
| 7436685 | Piecewise on-time modulation apparatus and method for a power factor corrector In a power factor corrector including a PWM switch to switch a line current generated from a line voltage to charge a boost capacitor to thereby generate an output voltage, a piecewise on-time modulation apparatus and method comprise comparing a line voltage depende... | 10/14/2008 |
| 7400517 | Power factor correction circuit and method therefor In one embodiment, a power factor correction circuit is configured to use a stored value of a feedback signal to assist in regulating the value of an output voltage and to bypass the sample and hold circuit if the output voltage increase to an upper limit or decreas... | 07/15/2008 |
| 7365996 | Switched-mode power supply A switched-mode power supply for converting a DC input voltage (Uzk) into an output voltage (Ua). The switched-mode power supply comprises a circuit (AST) for triggering at least one controlled switch (S) that periodically applies the input voltage to at least one p... | 04/29/2008 |
| 7365997 | Synchronous switching control circuit for power converters The present invention provides a synchronous switching control circuit for variable switching frequency power converters. It comprises a first circuit to generate a first signal in response to an input synchronous signal of a power converter. A second circuit is cou... | 04/29/2008 |
| 7362592 | Switching control circuit for primary-side controlled power converters The present invention discloses a switching control circuit for a primary-side controlled power converter. A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal. A current-waveform detector generates a current-waveform signal by ... | 04/22/2008 |
| 7362591 | Power supply device and image forming apparatus When a detected current value deviates from a range between an upper limit value and a lower limit value, a pulse width adjustment operation for increasing or decreasing a currently set counter value is repeatedly performed at every operation time interval such that... | 04/22/2008 |
| 7362593 | Switching control circuit having off-time modulation to improve efficiency of primary-side controlled power supply A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal by multi-sampling a voltage signal of a transformer. The discharge-time signal represents a discharge time of a secondary-side switching current. A voltage-loop error amplifie... | 04/22/2008 |
| 7339424 | Apparatus and method for controlling temperature of electronic apparatus In an embodiment of this invention, if a state, in which duty ratio of a PWM signal is kept equal to or greater than a predetermined value, has been maintained for a first time period, the duty ratio of the PWM signal of a digital power amplifier is adjusted downwar... | 03/04/2008 |
| 7333351 | Electronic circuit control element with tap element A technique for controlling a power supply with power supply control element with a tap element. In one embodiment, a power supply regulator includes a power transistor having first, second, third and fourth terminals. A control circuit is included, which is coupled... | 02/19/2008 |
| 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 |
| 7327113 | Electric starter generator system employing bidirectional buck-boost power converters, and methods therefor A bidirectional buck-boost power converter 13 including a pair of inverter modules 14, 15 disposed at an output of a machine, and an inductor Lo connected between the pair of inverter modules 14, 15. A method for controlling a voltage... | 02/05/2008 |
| 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 |
| 7321499 | Method of forming a power supply controller and device therefor In one embodiment, a power supply controller uses a ramp signal to form current sense ramp compensation. ... | 01/22/2008 |
| 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 |
| 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 |
| 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 |
| 7280375 | Circuit arrangement for operating at least one light-emitting diode A circuit arrangement is for operating at least one light-emitting diode LED in an electrical circuit at a service voltage greater than the forward voltage of the at least one light-emitting diode. The light-emitting diode is PWM-controlled. The circuit includes rea... | 10/09/2007 |
| 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 |
| 7265506 | Noise improved linear DC motor control systems and methods A linear power controller and related circuitry may be implemented to provide linear control of a variable DC electric motor. The controller and motor are coupled to form a closed loop for controlling the speed of the motor and for adjusting or compensating for nois... | 09/04/2007 |
| 7262562 | Method for driving a fluorescent lamp and an inverter circuit for performing such a method A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an instantaneous loading of a DC voltage source. The inverter circuit comprises ... | 08/28/2007 |
| 7259972 | Primary-side-control power converter having a switching controller using frequency hopping and voltage and current control loops A power converter includes a switch and a controller. The switch switches electrical power in the power converter. The controller generates a switching signal to control the switch in response to a first feedback signal associated with a voltage control loop and a s... | 08/21/2007 |
| 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 |
| 7254045 | Power supply circuit and electronic equipment A power factor is improved using a simplified structure without particularly providing a power factor improving circuit, and high efficiency is obtained. For this purpose, one terminal of a direct-current power source 12, from which a pulsating current is obt... | 08/07/2007 |
| 7239043 | Power conversion apparatus and methods using an adaptive waveform reference A power conversion apparatus, such as a UPS, includes a first waveform reference signal generator circuit operative to generate a first waveform reference signal responsive to an AC bus, and a second waveform reference signal generator circuit operative to generate ... | 07/03/2007 |
| 7236376 | Controller for regulating output current at the primary side of a power supply A controller controlling the output current at the primary side of a power supply is provided. A waveform detector generates a current-waveform signal. A second control circuit generates an oscillation signal for determining the switching frequency of a switching si... | 06/26/2007 |
| 7230219 | Inverter power source control for high frequency heater An oscillation control signal generated by an inverter power source control circuit (12) includes a reference voltage setting signal for approximating the current waveform of the AC output form the AC power source (1) to a sinusoidal wave by making bot... | 06/12/2007 |
| 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 |
| 7224589 | Inverter circuit for producing power factor correction effect Provided is an inverter circuit including a rectification and filter circuit and an inverter driver circuit interconnected the rectification and filter circuit and a load. The inverter driver circuit comprises a second controller for receiving light adjustment cycle... | 05/29/2007 |
| 7218081 | Power system having multiple power converters with reduced switching loss The present invention includes multiple power converters for driving one or more loads via an input power source, AC or DC. A first switching power converter has first one or more windings coupled to an input power source, and a second switching power converter havi... | 05/15/2007 |
| 7212415 | Resonance type switching power source A control circuit 6 of a resonance type switching power source comprises a drive circuit 21 for supplying drive pulses to each gate terminal of first and second MOS-FETs 2,3; a PWM circuit 9 for causing drive circuit 21 to produce ... | 05/01/2007 |
| 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 |
| 7203080 | DC converter A DC converter has a main switch connected in series to a primary winding of a transformer, and a series circuit of a capacitor and an auxiliary switch that is connected to both ends of the primary winding of the transformer or to both ends of the main switch, and a... | 04/10/2007 |
| 7200014 | System and method for transferring duty cycle information in an isolated DC/DC converter or other circuit A signal processing methodology and circuit for supplying bias power and duty cycle information across an isolation barrier, wherein, at an input side of the isolation barrier at least one input signal carrying input duty cycle information, together with DC bias pow... | 04/03/2007 |
| 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 |
| 7196916 | Alternated duty cycle control method for half-bridge DC-DC converter Apparatus, methods system and devices for using alternated duty cycle control to achieve soft-switching for at least one switch of the two half-bridge switches. When soft-switching can be only achieved for one switch, alternated duty cycle control alternates the sof... | 03/27/2007 |
| 7196479 | Electronic ballast having a protective circuit for a switching transistor of a converter The invention relates to an electronic ballast for lamps having a converter, in which a switching transistor is protected against transient disturbances by a detection circuit C1, C2, R1, R2, D1–3, T1. In this case, the ti... | 03/27/2007 |
