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6895046 |
System and method of providing a spread spectrum pulse width modulator clock
A system and method of creating a pulse train signal of a pulse width modulator whose fundamental frequency is time-varying is disclosed. The electrical system includes a pulse width modulator...
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6826060 |
Power supply apparatus
In a power supply apparatus having voltage doubler rectifier circuit ( 5 ) connected to secondary winding ( 1 B) of transformer ( 1 ), diode ( 13 ) is connected between transistor ( 3 ) and primary...
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6822646 |
Display apparatus with power supply having a power saving mode
A display apparatus includes a power supply comprising a commercial AC power supplying part, a transformer having a primary coil and a secondary coil and supplying an AC voltage to driving...
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6807071 |
Transformer isolated driver
A transformer isolated gate driver for realizing the driving of a power switch (a MOSFET) includes a PWM driver, an input capacitor, a transformer, an output diode, a active switch (a small power...
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6804126 |
Power supply start up circuit
A circuit provides a secondary output voltage from an input voltage. The circuit includes power supply circuitry for creating an unregulated DC bus voltage line and a regulator circuit connected to...
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6798672 |
Power converter module with an active snubber circuit
A power converter module includes a power transformer, a first power switch, and an active snubber circuit for recovering surge energy. The power transformer has a primary winding and a secondary...
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6728116 |
Magnetic circuit using switching
Disclosed is an electromagnetic circuit wherein coils are wound in a forward (clockwise) direction and in a reverse (counterclockwise) direction and semiconductor switches are mounted in front of...
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6711039 |
Method and apparatus for controlling synchronous rectifiers of a power converter
For use in a power converter having a power switch and a synchronous rectifier device coupled between input and output thereof, a control circuit, method of disabling a synchronous rectifier device...
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6704211 |
DC-to-DC converter
A DC-to-DC converter having an input voltage and an output voltage, which includes a circuit topology such that, in operation, the input and output voltages have the same polarity, and that a...
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6671190 |
DC/DC converter
A series circuit of a primary winding 1 A of a transformer 1 and a switching element 2 is coupled to a DC source 3 and a voltage induced in a secondary winding 1 B of the transformer 1 ...
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6643148 |
Audio band conducted emissions suppression on power feeders
A switch-mode power converter that powers the fan or blower unit in a communication system is used to suppress the audio band noise, thereby eliminating any need for additional passive or active...
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6617826 |
Charging device capable of dynamically adjusting charging power
A charging device capable of dynamically adjusting a charging power. The charging device has elements as follows. A DC-DC converter power stage is used for supplying a charging current to the...
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6614666 |
Universal output driver
A circuit for driving a communication line includes a transformer having a secondary winding for supplying an output drive signal, and having a primary winding connected to conduct current through...
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6614288 |
Adaptive drive circuit for zero-voltage and low-voltage switches
A circuit for controlling the switching behavior of a field effect transistor (FET) or other power switch in a power supply or converter. The circuit includes an adaptive feedback loop which...
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6610926 |
Junction box
A junction box ( 10 ) is constituted by a junction box body ( 14 ), on which a fuse outlet ( 11 e ) is formed, and a casing ( 18 ) for housing the junction box body ( 14 ). The casing ( 18 ) is...
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6587357 |
Method and apparatus for providing integrated low power self-supply in switched mode power supplies
A regulated self-supply power controller for a switched-mode power supply includes an operational voltage supply line having a voltage magnitude that varies between two voltage magnitudes. A...
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6583589 |
Horizontal drive circuit incorporating an integrated boost switch-mode power supply for a CRT display
A horizontal drive circuit employed in CRT displays which uses a switch-mode power supply operating in a boost topology to generate the appropriate supply voltage needed by the horizontal drive...
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6577509 |
Semiconductor circuit and switch-mode power supply
The invention relates to a semiconductor circuit having a drive circuit, a load that is disposed between a supply voltage, and a controllable, clocked semiconductor switching element for clocked...
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6545451 |
Load-dependent frequency modulation circuit and method for switching power system
A load-dependent frequency modulation circuit and a method thereof for a switching power system. The load-dependent frequency modulation circuit has a control integrated circuit, a feedback circuit...
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6529389 |
Universal input miniature power supply with a single split transformer primary winding
A transformer connected to a power source, which consists of a primary coil, a secondary coil and a magnetic core, the secondary coil being configured to provide a regulated DC output voltage...
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6515873 |
Switched-mode power supply
A switched-mode power supply has a storage capacitor, a transformer with a primary winding and at least one secondary winding, and also a switching transistor which is connected in series with the...
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6507502 |
Snubber circuit and power transformer using the same
The invention has a first series circuit consisting of a capacitor and a diode and a second series circuit consisting of a coil and a diode, the first series circuit is connected in parallel to the...
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6504737 |
Magnetic core for saturable reactor, magnetic amplifier type multi-output switching regulator and computer having magnetic amplifier type multi-output switching regulator
A magnetic core for use in a saturable reactor made of an Fe-based soft-magnetic alloy comprising as essential alloying elements Fe, Cu and M, wherein M is at least one element selected from the...
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6490176 |
DC/AC conversion apparatus and method having contactless, inductive energy transfer
A DC/AC converter is provided for contactless, inductive transfer of energy, which transfers arbitrary voltages to a removable user with the aid of a high-frequency pulse generator. The pulse...
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RE37889 |
Low loss synchronous rectifier for application to clamped-mode power converters
A synchronous rectifier for use with a clamped-mode power converter uses in one embodiment a hybrid rectifier with a MOSFET rectifying device active in one first cyclic interval or the...
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6449177 |
Power supply having a mixed mode regulator
A power supply having a mixed regulator is able to provide the suitable power source according to the changing load by a switching mode voltage circuit and a series pass controlling circuit. The...
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6421255 |
DC-to-DC converting circuit
The invention concerns a dc-to-dc converter controlled by a rectangular signal comprising an input for a direct voltage source (V DC ), a transformer comprising a primary coil ( 1 ) connected to...
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6421256 |
Method for reducing mains harmonics and switching losses in discontinuous-mode, switching power converters
A method for reducing harmonic distortions and switching losses in a power factor correction circuit of a quasi-resonant voltage converter, wherein using data derived from the sensing a voltage...
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6411532 |
Logic input device with energy recovery for an industrial automatic control system
An electronic equipment for onboard process control includes a first detection stage with a plurality input circuits, comprising each a first transformer having a primary coil connected to the...
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6388900 |
Constant-frequency active filter controlled by a peak current control mode
A constant-frequency active filter controlled by a peak current control mode, the constant-frequency active filter composes of a voltage step-up unit and a power factor corrector, wherein the power...
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6388898 |
Dc/dc power processor with distributed rectifier stage
A technique, which substantially reduces the number of power-stage and control circuit components in an isolated DC/DC converter with parallel current-doubler rectifier stages, includes on the...
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6388899 |
Inverter circuit
The inverter circuit can be structured by a simple structure as follows: an inductive element (the primary winding) 23 whose one end is connected to a DC power source 21; the first capacitor ...
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6377477 |
Self-driven synchronous rectifier by retention of gate charge
A synchronous rectifier is disclosed, which makes use of gate charge retention technique. In a forward converter after the main transformer is reset its secondary voltage diminishes to zero. For...
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6377476 |
Protection circuit for active switches in clamp-mode topologies, and power converter employing the same
An impedance network for passive shoot-through protection of active switches in clamp-mode topologies. In one exemplary embodiment a switch-mode converter, includes: a primary switch; an auxiliary...
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6373724 |
Power supply apparatus
A rectified commercially available power source is supplied to one end of a primary coil T 1 of a transformer T through a terminal TM 1 . A capacitor C for rectifying is provided between the...
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6373722 |
Power supply system for providing an auxiliary output voltage
A power supply system is disclosed. The circuit comprises a main power supply portion, the main power supply portion including a transformer, and an auxiliary power supply portion wherein the...
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6370643 |
Microcomputer reset device for positively resetting microcomputer before starting operation
A microcomputer reset device includes a switching circuit for comparing, after a reset of a CPU is released during power-up, a reference voltage Vref with a second divided voltage Vd 2 which is...
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6366474 |
Switching power supplies incorporating power factor correction and/or switching at resonant transition
The switching power supplies convert AC or DC input voltage into a DC output voltage. Conventional topologies are implemented, wherein power factor correction and/or square-wave switching at...
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6349045 |
Switched-mode power supply with switching-off from secondary side
The switched-mode power supply comprises a transformer, a switching transistor connected in series with a primary winding of the transformer, a primary-side control circuit and a secondary-side...
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6344981 |
Power supply circuit and method of calibration therefor
A power supply circuit ( 120 ) for supplying power to a load ( 130 ) comprises a regulator ( 122 ), a switching transistor ( 124 ) connected to the regulator; and a power transformer ( 126 )...
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6333861 |
Low loss snubber and transformer reset circuit for forward converters
A forward converter incorporating a low loss snubber and transformer reset circuit is disclosed. The transformer core of the forward converter is reset by the exchange of magnetizing energy between...
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6300747 |
Circuit having reduced losses occurring during transforming switching adjusting or controlling electric power
The invention relates to a circuit for transforming, switching, adjusting or controlling electric power, comprising an electric source 1, a load 2, and a device 3 for transforming, switching,...
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6282107 |
Integrated sense and switch circuitry for transformer core resetting
An integrated circuit has a MOSFET comprising a drain terminal, a source terminal and a gate control terminal, the MOSFET having an equivalent circuit that includes an intrinsic diode; and a diode...
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6278621 |
Single ended forward DC-to-DC converter providing enhanced resetting for synchronous rectification
A single ended forward DC-to-DC converter includes a transformer having a. primary winding electrically connected to a primary switch and a secondary winding electrically connected to a secondary...
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6252781 |
Active reset forward converter employing synchronous rectifiers
A converter comprises a first switch (102) for connecting an input DC voltage to a primary winding (103) of a transformer (104), a second switch (105) for connecting a reset voltage to the...
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6239989 |
Forward converter with improved reset circuitry
A forward converter has simple auxiliary circuit reset the flux to reduce the voltage stress and extend the maximum work duty, full discharge the magnetizing energy of transformer and forms the...
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6239988 |
Current sourced gate driver for fast thyristors
Circuits and methods are described for providing gate drive to a gate terminal of a first switching device. The circuit includes a transformer having a core, a primary winding, and at least one...
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6205036 |
Energy transfer unit, charge unit, and power supply unit
An energy transfer unit constructed such that a plurality of series-connected circuits which are formed by series-connecting at least windings 3a to 3d and switching means Sa to Sd are provided and...
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6195271 |
AC adaptor with power consumption reduction in unused state
An AC adaptor that can reduce power not in use state, and a battery-operated electronic apparatus that can employ such an AC adaptor. An AC adaptor includes, (a) an input line along which an...
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6191958 |
Horizontal deflection apparatus
Disclosed is an apparatus for controlling a drive transistor of a horizontal deflection apparatus which comprises a comparator; a switching controller which compares a reference voltage coupled to...
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