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Document Title |
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7599198 |
Resonance converter and synchronous rectification driving method thereof
A resonance converter and a synchronous rectification driving method thereof are provided. The resonance converter includes a switch circuit having at least two first switches, a resonance circuit...
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7570497 |
Discontinuous quasi-resonant forward converter
A discontinuous resonant forward power converter including a controller having an output coupled to a controllable switch and which is configured to control the switch such that a voltage waveform...
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7564704 |
Method of forming a power supply controller and structure therefor
In one embodiment, a power supply controller is configured to switch a power switch of a power supply when a voltage across the switch is at a minimum value.
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7532488 |
DC converter
A primary winding 5 a of a transformer T and a switch Q 1 are connected in series with a DC power source Vdc 1 . A series circuit composed of a switch Q 2 and a snubber capacitor C 3 is...
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7522430 |
Switching power supply apparatus
A switching power supply that can accurately detect a period during energy is supplied from a primary side to a secondary side of a transformer with a simple circuit configuration is provided. A...
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7512422 |
RF generator with commutation inductor
A radio frequency (RF) generator comprises a first half bridge including first and second power transistors; a second half bridge including first and second power transistors; an RF output node...
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7504868 |
High-side switch with a zero-crossing detector
A circuit arrangement comprising a high-side semiconductor switch with a first load terminal connected to a first supply terminal receiving an input voltage, a second load terminal connected to an...
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7466569 |
Power converter having phase lock circuit for quasi-resonant soft switching
The present invention provides a power converter having a phase lock circuit for quasi-resonant soft switching. The power converter includes a first circuit coupled to the feedback signal to...
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7450404 |
Switching power supply and ZVS method thereof
The provided switching power supply includes an auxiliary circuit having an auxiliary switch and a auxiliary capacitor, a transformer having a primary side coupled to the auxiliary circuit in...
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7411378 |
Power factor controller that computes currents without measuring them
A power factor controller for a switching power supply, that in one embodiment couples a power factor control circuit between an AC input and an output wherein a digital controller computes circuit...
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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...
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7336057 |
DC/DC converter
A DC/DC converter includes: a boost converter that boosts an input voltage in accordance with a first control signal; an insulated converter that converts an output of the boost converter in...
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7336037 |
Intelligent electrical switching device
The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of...
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7301786 |
Quasi resonant type switching power supply apparatus with overcurrent limiting
A quasi resonant type switching power supplying unit includes an overcurrent limiting circuit and an oscillation level comparison circuit. The overcurrent limiting circuit (i.e., a level...
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7291993 |
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...
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7292461 |
Switching power source apparatus
A switching power source apparatus has a switching element being connected with a DC power source through a primary winding of a transformer in which parasitic capacitance exists between terminals...
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7239531 |
Resonant lossless circuit for providing a low operating voltage in power converter
A converter-controller includes a power device, coupled to the primary coil of a transformer, a resonant circuit, coupled to the primary coil and the power device, a voltage regulator, coupled to...
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7196912 |
Lighting apparatus for discharge lamp
In a lighting apparatus for a discharge lamp, a mask signal against a re-arc voltage is correctly generated to detect a lamp voltage accurately in view of a support to high frequency lighting such...
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RE39341 |
Apparatus for lighting fluorescent lamp
A fluorescent lamp lighting apparatus in accordance with the present invention has first switching means (M 1 ) driven by a high-voltage-side pulse signal input from a drive-signal generation...
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7110268 |
Switching power supply circuit
The present invention provides a power supply circuit performing constant voltage control by switching frequency control and achieving minimization of a necessary control range of the switching...
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7110267 |
Circuit and method of igniting a high-pressure lamp
The invention relates to an electronic circuit for igniting a high-pressure lamp. A resonant circuit 13 of the circuit is used to supply the ignition voltage for the high-pressure lamp. To enable...
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7110269 |
Soft-switching techniques for power inverter legs
This invention relates to new soft-switching techniques for minimizing switching losses and stress in power electronic circuits using inverter legs. By choosing the switching frequency with...
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7095634 |
Arc welding set with power source and inverter
A welding machine with a power source and an inverter. The inverter has at least one switching leg, made up of switches in series, and an output terminal. The power source has a circuit for...
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7049767 |
High voltage offset detection circuit and method
A high voltage offset detection circuit registers the voltage at the midpoint of a switching half-bridge to determine when the midpoint voltage reaches a given value to avoid hard-switching in the...
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6975520 |
DC-DC converter having stable input voltage
Provided is a DC-DC converter which is capable of obtaining a stable output irrespective of the fluctuation of the power source voltage and ensuring the reliability of a device. The DC-DC converter...
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6961254 |
Insulating switching DC/DC converter
In a DC/DC converter using an insulating transformer Tr having a center tap on the secondary side, an input choke coil L 1 and an output choke coil L 3 are integrated with the insulating...
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6912137 |
Inductive contactless power transmitter
The present invention relates to an inductive contactless power transmitter having a primary side including a first inductor (L P ) on the primary side and an oscillator for producing an...
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6852707 |
Remedies for hyperammonemia
By using xylobiose or xylooligosaccharide containing xylobiose as a main ingredient in place of lactulose, there is provided a blood ammonia lowering agent, a therapeutic agent of hyperammonemia or...
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6839246 |
Self-driving circuit for a DC/DC converter
The present invention provides a self-driving circuit of a low voltage, large current, and high power density DC/DC converter. The converter comprises a transformer, power MOS transistors (S),...
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6768656 |
Power converter with input-side resonance and pulse-position demodulation feedback control
A DC power converter enclosing a regulated AC power supply within the overall design topology. The power transfer function incorporates a process wherein a portion of the negative AC signal,...
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6654259 |
Resonance type switching power supply unit
An object of the present invention is to create the optimum resonating condition to constantly decrease switching losses. A converter transformer capable of varying the leakage inductance is...
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6631082 |
Switching power supply unit
A switching power supply unit is capable of performing zero-voltage switching in the entire load region to reduce switching loss and noise and improve the voltage transmission efficiency. The...
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6590787 |
Wide range zero voltage switching resonance type converter
A complex resonance-type converter provided with a voltage-resonance-type converter on the primary side and a resonant circuit on the secondary side for supplying a plurality of direct-current...
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6570777 |
Half sine wave resonant drive circuit
A half sine wave resonant drive circuit provides a greater duty cycle range of operation without a loss in power, particularly at higher frequencies. A resonant circuit is capacitivly coupled to a...
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6496388 |
Quasi-resonant converter
A converter 10 has an IGBT power switch 34. A resonant tank circuit 30 couples the IGBT to a voltage source. A gate controller turns the IGBT on and off by applying a suitable gate control...
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6490177 |
Resonant power converter with primary-side tuning and zero-current switching
A DC power converter consisting of a series-resonant branch used to transform a DC voltage source into a DC current source exhibiting, a uni-polar, zero-current-switching characteristic. Frequency...
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6483721 |
Resonant power converter
A resonant power converter includes a DC power source 1, a pair of MOS-PETs 1 and 2 which are connected in series to the DC power source, a transformer Tr 1 which is arranged at the...
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6396717 |
Switching power supply having an improved power factor by voltage feedback
A switching power supply circuit formed by providing a complex resonance type converter with a power factor improving circuit feeds back a voltage resonance pulse voltage generated in a...
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6396719 |
Dc-to-dc converter
A transformer has a primary winding connected across a d.c. power supply via a parallel connection of a switch and a resonant capacitor, and a secondary winding connected across a load via a...
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6370043 |
Switching power supply circuit formed as a composite resonance converter
A switching power supply circuit of the resonance type which can handle high load power and has high power conversion efficiency, small size and light weight is provided. The switching power supply...
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6249444 |
Offset resonant ZVS forward converter
A forward converter circuit that includes elements capable of generating a zero volt switching (ZVS) signal across the power switch. The ZVS generating elements include a series combination of a...
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6229717 |
Switched power supply converter operable in a natural zero-voltage switching mode
A zero voltage switched power supply converter includes a series combination of a first winding and a first switching element. A second winding is connected to a second switching element and to a...
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6212079 |
Method and apparatus for improving efficiency in a switching regulator at light loads
A switching regulator that operates at a frequency for a first range of feedback signal values and at a variable frequency without skipping cycles for a second range of feedback signal values. In...
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6166926 |
Zero voltage switching power supply with burst mode
In a tuned switch mode power supply, a supply inductance is coupled to a capacitance to form a tuned, resonant circuit. A transistor switch is coupled to the resonant circuit for generating current...
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6091611 |
Connectors adapted for controlling a small form factor power supply
The subject matter disclosed herein relates to mechanisms for programming power supply circuitry for providing an appropriate current or voltage to powering portable devices or recharge batteries....
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6061253 |
Variable frequency soft switching power supply with reduced noise and improved power factor
A switching power supply uses zero-current and zero-voltage switching to reduce switching noise. A main switch and an auxiliary switch channel current and voltage between various component paths to...
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5991171 |
DC-to-DC converters
A DC-to-DC converter is described that provides resonant-transition switching by ensuring that the voltage across a first switch falls to zero between cycles.
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5909362 |
Resonant power converter
A resonant power converter holds energy within the circuit for a variable period to provide fixed-frequency, zero-voltage switching power conversion. A first switch alternately connects and...
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5896278 |
Non-contact electric power transmission apparatus
A non-contact electric power transmission apparatus including a power supply unit and a load unit. The power supply unit has a first oscillation circuit, a signal secondary winding, a filter...
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5877946 |
Forward converter with an inductor coupled to a transformer winding
A forward converter includes a chopper transformer having a primary winding and one or more secondary windings. A corresponding rectifier and a corresponding filter capacitor is coupled to each...
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