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8102683 |
Phase angle measurement of a dimming circuit for a switching power supply
An example controller for a switched mode power supply includes a zero-crossing detector, a feedback reference circuit, and a drive signal generator. The zero-crossing detector is coupled to...
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8059432 |
PWM controller having drive control with input voltage sensing and method therefor
In one embodiment, a PWM controller includes a circuit operably coupled to inhibit a drive signal responsively to a bulk input voltage remaining at a low value for a time interval and to re-enable...
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8040699 |
Secondary side constant voltage and constant current controller
A low-cost integrated circuit is used as a secondary side constant voltage and constant current controller. The integrated circuit has four terminals and two amplifier circuits. A first amplifier...
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8031490 |
Power supply circuit and power supply system
To provide a power supply circuit which can be applied worldwide without using a high withstand voltage switching element and can supply a load device with stable power. A charging section is...
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8023295 |
Direct current (DC) to alternating current (AC) generation
In one embodiment, a power converter system comprises an input terminal operable to connect to a DC power source and an output terminal at which an output voltage can be provided. An active clamped...
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8008902 |
Hysteretic buck converter having dynamic thresholds
A hysteretic buck converter provides improved regulation control, in particular for buck converter standby operation. A comparison circuit compares the output voltage of the buck converter to a...
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8004864 |
Method and apparatus for a control circuit responsive to an impedance coupled to a control circuit terminal
An example power supply includes a controller and a detection circuit. The controller includes a sense terminal coupled to provide a sense terminal current representative of an input voltage of the...
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7869235 |
Flyback converter having an active snubber
A flyback converter having an active snubber includes a transformer to receive input power. The transformer has a primary winding at a first side. The active snubber is coupled in parallel with two...
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7848124 |
Overload and short protected soft-start converter
A converter and a driving method thereof are provided. The converter can determine the output short state of the converter after the soft start is finished by using a detection signal that...
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7825645 |
Switched-mode power supply regulation
The invention concerns a circuit for detecting an overload in a load supplied by a switched-mode power supply, comprising: a first comparator of a first voltage based on the supply voltage of the...
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7821798 |
High voltage power supply
Provided is a high voltage power supply which includes a controller to provide a PWM signal and a power signal, an input unit to receive the PWM signal provided from the controller, a comparison...
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7787269 |
Switching power supply device
The present invention provides a switching power supply device including a switching element, a control circuit controlling the switching element, a transformer having an auxiliary winding, a...
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7782638 |
Switching power supply device, semiconductor device, and control method
A plurality of arrangements for detecting an overload of energy supplied to an output part enables selecting latch-off or auto-recovery overload protection by the operation of a switching device....
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7782009 |
Adjustable speed drive protection
A protection scheme to protect pulse width modulated drives is described. The scheme is implantable in both hardware and software and combinations thereof. The semiconductor devices of the drive...
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7773394 |
Digital latch control circuit for over-voltage protection and power converter using the control circuit
An AC/DC power supply with over-voltage protection includes a voltage converting circuit and a digital latch control circuit. The voltage converting circuit has a first-side winding, a second-side...
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7633776 |
DC-DC converter for overvoltage protection
A DC-DC converter for overvoltage protection is provided with a primary control circuit 12 which comprises an impedance controller 31 and a protective circuit 41 for ceasing operation of primary...
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7633777 |
Active peak voltage-limiting clamp circuit
The present invention discloses an active peak voltage-limiting clamp circuit, which comprises a primary switch unit and a secondary switch unit that are used to control the coil current of a...
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7558090 |
System for transferring an alternating voltage into a direct voltage
A system for transferring an alternating voltage into a direct voltage includes a rectifier, a filter, a transformer, a switch, a switch control circuit and a voltage feedback circuit. The...
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7554820 |
Series resonant DC-DC converter
A series resonant Dc-DC converter powers an audio amplifier as a load. The series resonant DC-DC converter may include a power input stage, a switching stage, a series resonant stage, a transformer...
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7518836 |
Switching mode power supply and method for performing protection operation thereof
A switching mode power supply and a corresponding method of protection operation is presented. A switching controller of the switching mode power supply receives current sensing information...
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7515442 |
Secondary side controller and method therefor
In one embodiment, a secondary side power supply controller is configured to enable a secondary side power switch independently of a state of a drive signal used to control a primary side of the...
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7492618 |
Inverter device
An inverter device includes an inverter circuit, an inverter driving unit, and a clamp diode. The inverter circuit includes an upper arm unit and a lower arm unit connected in series. The upper arm...
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7477532 |
Method of forming a start-up device and structure therefor
In one embodiment, a start-up controller for a PWM power supply controller is formed to generate a current that is substantially constant for changes in temperature and for changes in an output...
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7359221 |
Power supply for use in an electronic energy meter
A three-phase electronic electricity meter that includes a power supply circuit operable to create a constant voltage output when receiving a variable voltage input. The power supply circuit of the...
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7355867 |
Power supply for an electric meter having a high-voltage regulator that limits the voltage applied to certain components below the normal operating input voltage
Disclosed is an invention relating to a power supply for use in an apparatus for measuring electrical energy, comprising, in one embodiment, a first switching device, a device for storing...
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7355870 |
Switching mode power supply and method for outputting voltage therefrom
A switching mode power supply and a method for outputting voltage therefrom are provided, where a transformer receives rectified alternating current (AC) voltage and transforms a voltage value or a...
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7339805 |
Power supply having voltage blocking clamp
A power supply comprises a rectifier, a transformer, a switching member, a controller and a voltage blocking clamp. A power supply can receive an alternating current (AC) input voltage having any...
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7304870 |
Power converter
A power converter comprises an inductor (L) and a main switch (M1) having a main current path, the inductor (L) and the main current path are arranged in series to receive a DC-input voltage (VIN)....
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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 Vdc1 and having a reactor L3, a primary winding 5a of a transformer T, and a switch Q1, a series...
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7133300 |
Over-voltage protection circuit for power converter
The present invention proposes an over-voltage protection apparatus for a power converter. The over-voltage protection apparatus has an oscillator outputting a clock signal. Simultaneously, by...
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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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7023713 |
Voltage overshoot reduction circuits
Feedback circuits capable of preventing output voltage overshoot in closed-loop DC regulated power supplies are presented. The circuits employ hysteresis at the input of an operational amplifier to...
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6975523 |
Power supply capable of protecting electric device circuit
A power supply protecting the electric device circuit when over-voltage is applied, is provided. The power supply has a rectifying unit rectifying AC power externally supplied, into first and...
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6972971 |
Pulse width modulation signal generator and switching mode power supply including the same
A switching mode power supply includes a rectifier configured to convert AC power to a first DC power, an output unit configured to convert the first DC power to a second DC power under the control...
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6882548 |
Auxiliary active clamp circuit, a method of clamping a voltage of a rectifier switch and a power converter employing the circuit or method
The present invention is directed to an auxiliary active clamp circuit and a method of clamping a voltage of a rectifier switch associated with a power converter. The power converter includes a...
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6856523 |
Level shifted drive for clamp device
A DC/DC converter device is provided that employs a clamp device to limit the peak voltage of a main power switch coupled to a primary winding of a transformer. The clamp device is driven employing...
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6822882 |
Gate driver with a DC offset bias circuit and a power converter employing the same
A gate driver and a method of driving a switch for use with a power converter having a main active clamp circuit associated with a main power switch coupled to a primary winding of a transformer...
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6813171 |
Dissipative clamping of an electrical circuit with a clamp voltage varied in response to an input voltage
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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6788557 |
Single conversion power converter with hold-up time
A power converter is provided that operates with a wide range input and provides the required hold up time using a smaller, less costly hold-up capacitor. A charging circuit is provided to charge a...
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6707690 |
Power converter employing switched split transformer primary
A pulse-width modulated apparatus to convert an input voltage to an output voltage at advantaged duty-cycles utilizes more than two switches in a converter design. The switches implement current...
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6664660 |
Parallel power supply system with over-voltage protection circuit
A parallel power supply system with an over-voltage protection circuit is provided. The parallel power supply system includes two power supplies which are paralleled for providing a stable DC...
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6600668 |
Crowbar circuit for low output voltage DC/DC converters
A crowbar circuit comprises an over-voltage detector that monitors the output voltage of a synchronous DC/DC converter. When the output voltage rises above a predetermined threshold, the detector...
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6542388 |
Intermittent switching power supply circuit
An intermittent switching power supply circuit prevents excessive output power on a secondary side of a circuit. An intermittent oscillator is alternately switched on and off to maintain output...
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6525948 |
Apparatus and method for the detection of circuit irregularities and for circuit protection of a power supply
The present invention provides a ring choke converter, a kind of power supply, and method thereof. In addition to the transformer, the switch component, the positive feedback circuit and the...
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6510064 |
Power supply restart circuit
A restart circuit for a power supply of an electronic system such as a computer system for delaying the restart of the power supply until a power supply output is in compliance with a specified...
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6487059 |
Switching mode power supply device with detection of malfunctioning
The power supply device includes a DC-DC converter circuit having a power switch and a driving stage. The driving stage has a compensation terminal on which a compensation voltage is present, and...
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6442050 |
Protection circuit and method for switching power supply
A protection circuit arranged in a switching power supply system for protecting the switching power supply system is provided. The protection circuit includes a detecting circuit electrically...
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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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6400587 |
Universal input flyback with secondary shunt voltage limiter
A clamp circuit for limiting output voltage from a power supply secondary inductor to a ground when a first secondary node has a first secondary node voltage above a predetermined value relative to...
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6130826 |
Switching power supply with auxiliary power supply device for initialization
A switching power supply is provided which is capable of supplying a stable voltage to a control circuit with high precision so as to enable an electronic part that does not have a high voltage...
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