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7391626 |
Chop wave control circuit
A chop-wave control circuit includes a feedback unit, a ramp generation unit, a latchup unit and a voltage transformation unit that is used on a forward transformation circuit which includes at...
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7385831 |
Power supply device and vehicle lamp
A power supply device includes: a regulator transformer; a primary switch for selectively supplying a current to the regulator transformer; a control circuit for reducing to 0, following each...
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7382633 |
DC converter
A DC converter includes a time difference detector to detect a time difference between a point around which a main switch provides a minimum voltage after an auxiliary switch turns off and a point...
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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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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...
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7330359 |
Power supply unit
The present invention is directed to a power supply unit that provides large power supply to the load. The voltage detector 51 generates a voltage detection signal by detecting the voltage...
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7321498 |
DC-DC converter having synchronous rectification without cross conduction
An apparatus ( 54 ) is provided for preventing cross conduction in a synchronous rectifier of a DC-DC converter ( 10 ). The DC-DC converter has an input MOSFET switch ( 26 ) coupled to primary...
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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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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...
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7248486 |
Energy efficient switching converter
A switching converter in which an input voltage can be switched by means of at least one controlled switch to at least one primary winding of a transformer, with a control circuit for controlling...
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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...
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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...
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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...
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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...
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7200013 |
Power supply device and single photo-coupler control circuit thereof
A power supply device and a single photo-coupler control circuit thereof are provided. The power supply device includes a single photo-coupler control circuit, a main converter and an auxiliary...
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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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7193870 |
Method and apparatus for dissipative clamping of an electrical circuit
Dissipative clamping apparatuses and methods for electrical circuits. In one aspect of the invention, In one aspect of the invention, a method includes switching a power supply input on an energy...
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7187564 |
Switching power supply unit
A switching power source apparatus has a series circuit connected to both ends of a DC power source Vdc 1 and having a reactor L 3 , a primary winding 5 a of a transformer T, and a switch Q 1 ,...
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7173831 |
Power converter having a primary side switching circuit
In one embodiment, an apparatus includes a transformer having a primary winding and a secondary winding and a switching circuit to facilitate a periodic application of an input voltage to the...
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7164589 |
Bridgeless bi-directional forward type converter
A circuit is provided for converting power from an AC power source to DC power. The circuit including bi-directional switches capable of conducting and blocking a current flow in both directions....
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7130201 |
Power supply device for outputting stable programmable power supply
The present invention discloses a power supply device for outputting a stable programmable power supply, which comprises a transformer disposed at a DC output end of the power supply device, and a...
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7102900 |
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...
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7061779 |
Power factor correction circuit
A power factor correction circuit structure is described. The power factor correction circuit comprises a series connection of a first winding, a diode, an inductor and a first capacitor. The...
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7057906 |
Insulating switching DC/DC converter
In a switching DC/DC converter using an insulating transformer Tr, a primary coil and a secondary coil of the transformer Tr, an input choke coil L 1 , and an output choke coil L 3 are wound...
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7016203 |
Self-driven circuit for synchronous rectifier DC/DC converter
A power converter having a primary circuit (e.g. full bridge) and a secondary circuit (e.g. current doubler) has switches in the secondary circuit that are controlled by a drive circuit. The drive...
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7012820 |
Forward converter with controlled reset
A power device such as a forward converter employing a main switch in series with a power transformer coupling an input, primary circuit and an output, secondary circuit has its transformer reset...
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7012818 |
Switching power supply device
In a switching power supply device, the operating voltage is supplied to the power-factor improvement control circuit when the switching power supply device is operating under normal operating...
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6999324 |
Method for operating a switch in a free-running switch mode power supply, and a drive circuit for a switch in a free-running switch mode power supply
A method for operating a switch, which is connected in series with a primary coil of a transformer in a free-running switch mode power supply, includes the provision of a modulation signal and the...
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6977823 |
Switch power supply apparatus
The present invention provides a power supply apparatus with a plurality of digital control units. Each digital control unit is used to control an independent output terminal for outputting a...
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6977362 |
Induction heating device with a switching power source and image processing apparatus using the same
An induction heating device includes a plurality of induction coils connected to a single high-frequency power source and each being able to be ON/OFF controlled by a switch. A current is...
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6967851 |
Apparatus for reducing the power consumption of a PFC-PWM power converter
An apparatus for reducing the power consumption of a PFC-PWM power converter is described. The apparatus includes a control terminal used to detect a line-input voltage and to control a PFC signal...
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6862197 |
Arrangement for demagnetizing a transformer
To demagnetize a transformer (TR) in a single-ended forward DC/DC converter with self-driven synchronized rectifiers (V 1 , V 2 ) connected across the secondary winding (N 2 ) of the transformer...
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6850423 |
Common mode noise cancellation circuit
A common mode noise cancellation circuit eliminates common mode noise generated by one or more high-frequency switching devices. A common mode noise waveform generated by the one or ore switching...
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6819575 |
AC/DC switch mode power supply with power factor correction using direct energy transfer concept
Power Factor Correction (PFC) “flyboost” cell, with a transformer having primary winding connected to input power and secondary winding connected to output rectifier, which has both functions...
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6819574 |
Self-driven circuit for synchronous rectifier DC/DC converter
A power converter having a primary circuit (e.g. full bridge) and a secondary circuit (e.g. current doubler) has switches in the secondary circuit that are controlled by a drive circuit. The drive...
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6807069 |
Direct current converter with integrated transformer windings and output voltage filtering coils on the same magnetic core
Chopper-type direct-current converter comprising a magnetic core (M), which comprises a first and a second side leg (MS 1 , MS 2 ), the ends of which are connected to each other with pieces, and a...
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6707283 |
Primary side sensing circuit for producing a secondary side constant current, constant voltage output
A switching power supply ( 30 ) includes a compensation circuit ( 58 ) which monitors a transformers ( 36 ) primary side to provide a voltage compensation signal, COMP V . A transistor inductor...
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6697269 |
Single-stage converter compensating power factor
A single-stage converter improving power factor. The single-stage converter includes a power factor improving unit, a bridge diode unit, a voltage smoothing condenser, a transformer circuit unit,...
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6600667 |
Electronic transformer
An electronic converter having an input circuit and an output circuit which, in addition to the converter function, carries out power-factor correction. A control circuit opens and closes an...
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6549429 |
Switching-power supply unit for reducing power consumption in a stand-by-mode
In a normal operation mode, a mode changeover controller 8 continuously operates a PWM control circuit 6 so as to operate a switching element 5 at the basic oscillation frequency. In a...
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6519164 |
Single power stage AC/DC forward converter with power switch voltage clamping function
A method and circuit for clamping a voltage across a switching element in a forward converter circuit to a value equal to or less than the DC bus voltage. The disclosed circuit and method achieves...
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6498734 |
Power supply unit having reduced size and weight and an electronic apparatus using the same
A power supply unit having: transformer ( 2 ) with primary winding ( 2 p ) connected to D.C. power supply ( 1 ); switching element ( 3 ) connected to the primary winding ( 2 p ) of the transformer...
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6496389 |
Power factor improving switching circuit
A switching power circuit having a power factor improving circuit for a composite resonance type converter, wherein a switching pulse is fed back from a tertiary winding, which is coiled around an...
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6477064 |
High efficiency DC-DC power converter with turn-off snubber
The invention is a DC-DC converter in which the voltage across the main switch due to the leakage inductance of the transformer is clamped and a pair of capacitors play the role of lossless...
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6477063 |
Multi-output switching power source apparatus
A multi-output switching power source apparatus having a plurality of outputs, wherein electric power regenerated from a load side to one of the outputs can be output as electric power supplied to...
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6466460 |
High efficiency, low voltage to high voltage power converter
A high efficiency power converter for generating a high voltage from a low voltage supply. The power converter includes a resonant circuit in electrical communication with the low voltage supply...
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6452818 |
Self driven active clamp
A forward DC/DC converter with an active clamp that is driven directly from the primary or secondary of the transformer. The clamp may be on the input or the output circuit and may be of either...
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6434023 |
Method for switching off a switched-mode power supply in the event of short-circuit, and a switched-mode power supply
In order to achieve complete short-circuit protection irrespective of a location of a short-circuit in a switched-mode power supply having a controllable switch in a primary 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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6400582 |
Dual forward power converter utilizing coupling capacitors for improved efficiency
A dual forward power converter and method of operation thereof. The dual forward power converter includes first and second power transformers, where each of the power transformers has first and...
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