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7609038 |
Switching power supply with protection function
A switching power supply with protection function includes a transistor controlled to be on or off by a PWM signal from a PWM controller to convert a DC voltage into a square wave signal, a filter...
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7598680 |
Electronic power protection circuit and applications thereof
An electric power protection circuit connected in series to a secondary side circuit of a transformer in a switch mode power supply includes a voltage/current limiting device to get an electric...
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7577003 |
Switching power supply
A switching power source is capable of conducting constant-current drooping control on a load, increasing an energy conversion efficiency on a secondary side, and improving heat radiation...
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7570501 |
DC-DC converter with capacitor precharging and duty ratio limiting
In a DC to DC converter, first and second primary windings are magnetically coupled to a first secondary winding. Third and fourth primary windings are magnetically coupled to a second secondary...
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7541792 |
Compensated switching power supply controller and method therefor
In one embodiment, a multi-channel power supply controller adjusts the value of an error signal to minimize overshoot and undershoot during load transients.
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7518838 |
Protection of variable frequency power systems from excessive peak electrical potentials
A method of protecting an electromechanical power transfer system from excessive peak electrical potentials, the power transfer system comprising a prime mover, a dynamoelectric machine coupled to...
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7518416 |
Method and apparatus for detecting switching current of magnetic device operated in continuous current mode
The present invention provides a method and apparatus for detecting a continuous current of a switching current. A current signal is produced in response to a switching current of the magnetic...
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7511976 |
Self powered supply for power converter switch driver
Self-powered supplies are presented for powering a power converter switch driver with power obtained from an associated snubber circuit, in which a supply circuit and a snubber circuit are...
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7511975 |
System and method for limiting AC inrush current
A system for limiting AC inrush current to a power supply. The system comprises first, second, and third windings magnetically coupled to a core of a transformer of the power supply. The system...
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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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7466083 |
Protective device for vehicle electronic apparatus
A protective device for a vehicle electronic apparatus, which includes an inverter for converting a direct-current voltage into an alternating-current voltage for the vehicle electronic apparatus,...
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7443703 |
Semiconductor device
A semiconductor device has a semiconductor element connected to an input/output terminal and a reference voltage terminal, a first rectifier element connected between the input/output terminal and...
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7440297 |
Fault detection for loss of feeback in forced switching power supplies with power factor correction
A device corrects the power factor in forced switching power supplies and includes a converter and a control device to obtain a regulated voltage on an output terminal. The control device comprises...
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7430131 |
Start-up circuit for providing a start-up voltage to an application circuit
A startup circuit for providing a startup voltage from a high voltage DC bus voltage to an application circuit including an integrated circuit package for at least a control circuit for driving at...
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7379310 |
Over-voltage protection circuit for a switched mode power supply
The switched mode power supply comprises an inductor, a switching transistor, a controller circuit coupled to the switching transistor, a rectifying means and a feedback regulation loop for...
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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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7355866 |
Method of detecting phase-loss state of three-phase power supply
The disclosure relates to a method of detecting the phase-loss state of the three-phase power supply. When the phase-loss condition occurs in the input three-phase power supply of the power...
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7352544 |
Method and apparatus for providing a remedial strategy for an electrical circuit
A method and electrical circuit for dynamic reconfiguration of a DC-to-AC inverter comprising first and second power rails where each the rails has a power source. The method comprises monitoring...
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7315130 |
Switching control for inverter startup and shutdown
An electronic ballast circuit for a lamp is described, wherein the ballast comprises a power factor correction circuit coupled to an inverter circuit. The inverter circuit is further coupled to a...
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7253577 |
Independent safety processor for disabling the operation of high power devices
A drive for delivering a high-power signal to a load includes a power circuit and a drive circuit. The power circuit is operable to provide a high power signal to the load in response to a control...
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7242153 |
Pulse width modulation inverter circuit and control method thereof
A pulse width modulation inverter circuit is provided. The circuit includes a power switch driver, a power switch, a transformer unit, a feedback detector unit, and a voltage control oscillator....
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7236003 |
H-bridge circuit with shoot through current prevention during power-up
The H-bridge circuit with shoot through current prevention during power-up includes: a high side transistor; a low side transistor coupled in series with the high side transistor; pull down devices...
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7233507 |
Non dissipative snubber circuit with saturable reactor
A new type of the passive non-dissipative snubber with a single saturable reactor improves the performance of the boost converter used as a front-end active Power Factor Correction (PFC) in two...
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7180757 |
Sequential soft-start circuit for multiple circuit channels
A first to an n-th current sources supply a first to an n-th charging currents, respectively. A sequence control circuit allows an x-th charging current of the first to the n-th charging currents...
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7135845 |
Drive circuit for a switch in a switching converter and method for driving a switch in a switching converter
The present invention relates to a drive circuit for a switch (T) connected to a rectifier arrangement in a switching converter which provides an output voltage (Vout) from an input voltage (Vin),...
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7123492 |
Circuit for reducing inrush current generated during startup of a switching power supply
A circuit for reducing inrush current generated during startup of a switching power supply, which includes a reference voltage generator, an error amplifier, an oscillator, a sawtooth wave...
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7110271 |
Inrush current prevention circuit for DC-DC converter
An inrush current prevention circuit for a DC-DC converter is provided and in preferred aspects comprises a switching element that transforms an input voltage by being switched on and off and...
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7081719 |
Computer power supply with a display function
A computer power supply with a display function has a rectifying circuit, an EMI filter, a power factor corrector, a switching circuit, a transformer and a secondary coil voltage regulator located...
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7072192 |
Power circuit restraining rush current
A power circuit for an electronic machine includes first and second step-up circuits, and a voltage applier. The first step-up circuit has a step-up transformer and a current controller. The...
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7049879 |
Power supply circuit with control of rise characteristics of output voltage
In a power supply circuit, a main transistor, which transmits power from an input terminal to an output terminal, is controlled so that a detected voltage from an input voltage is consistent with a...
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7042198 |
System using a power converter
EMI noise in a system using a power converter with switching control is reduced in a simple configuration. The power converter 3 includes a converter 31 , a smoothing capacitor 32 , and an...
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7016207 |
Power inverter
In a power converting apparatus including a capacitor connected in series which serves to divide a DC voltage, and a PWM inverter bridge for converting the DC voltage into an AC phase voltage...
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7015681 |
Power switching circuit with current sharing capability
A power switching circuit comprising a first power switching device the first power switching device having a control electrode and two main current carrying electrodes, a sense circuit for...
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7012816 |
Self-excited switching power supply circuit
A self-excited switching power supply circuit is provided which reduces a discharge current generated when an oscillating field effect transistor ( 3 ) is turned on, whereby it is possible to...
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6975522 |
Device and method for inhibiting power fluctuation
A power fluctuation inhibiting device for effectively inhibiting fluctuation of power supply voltage that is supplied to internal circuits. The inhibiting device includes a power fluctuation...
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6952356 |
Adaptive over-current detection
Disclosed are methods and apparatus for over-current detection in PWM power stages. Disclosed methods and apparatus provide over-current detection with adaptive filtering according to the pulse...
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6919711 |
Electrical machine and an electrical power generating system
A generating set includes an engie driven generator (PGM) having two sets of stator windings (Ga and Gb). A bi-directional AC/DC converter (BCo) has its AC input connected to a junction between the...
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6912411 |
External power supply control system for cellular phone
An external power source control system for a portable telephone includes: a regulator 5 connected at an input thereof to a battery power source 1 or an external power source 2 and outputting...
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6909619 |
Spike control apparatus for DC-DC converter
There are disclosed a synchronous rectifying type of DC—DC converter, a DC—DC converter control circuit constituting such a type of DC—DC converter, a monitor circuit for monitoring an...
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6867575 |
Switching mode power supply incorporating power line filter
There is disclosed a switching mode power supply with a reduced EMI effect, comprising a rectifier for converting an AC power supplied by an AC power source into a rectified DC power, a transformer...
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6833597 |
Integrated MEMS power-save switch
An integrated circuit (IC) chip provided with a ‘power-save’ switch, including MEMS (Micro-Electro-Mechanical Systems) switches in each power and ground ring, to be used to open the circuit and...
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6747458 |
Method for monitoring the ground potential of a rectifier drive
A method for ground potential monitoring of a rectifier drive, having a capacitor which is connected with a voltage source via a switching device. The method including applying a test voltage...
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6744647 |
Parallel connected converters apparatus and methods using switching cycle with energy holding state
A power converter apparatus includes an input port and an output port. First and second inductors are coupled to the output port. A first switching circuit is coupled to the input port and the...
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6744645 |
Output feedback and under-voltage detection system
A switched mode controller for properly handling an under-voltage condition in a power line which includes a current mirror for receiving current from the power line; a reference current source...
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6738270 |
Parallel power source system
Disclosed is a parallel power source system which has a plurality of power supply units connected in parallel to one another and is designed in such a way that a voltage loss in an inverse-current...
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6738269 |
Line linkage protective device for electricity generation equipment
A device includes a governor for controlling the frequency of the generator of a private power generation equipment, function generating means having a function characteristic for detecting the...
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6693806 |
Electric power source
In an electric power source for supplying an electric power from a battery to an electric power line with boosting a voltage generated by the battery so that the electric power of boosted voltage...
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6687140 |
Disconnection detecting circuit detecting disconnection based on a change in detection signal
A disconnection detecting circuit includes switches for setting a detection signal to be supplied for a signal line, a resistor for supplying the signal line with the detection signal set by the...
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6674657 |
Overvoltage-protective device for power system, AC/DC converter and DC/DC converter constituting the power system
There is intended to provide an overvoltage-protective device capable of protecting a power system from overvoltage not destructively without using a fuse. An alarm signal from an MOS transistor Tr...
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6657874 |
Semiconductor converter circuit and circuit module
A diode ( 4 ) is a reverse blocking rectifier diode and connected in series to an IGBT ( 3 ) in a direction where a forward current flows in the diode ( 4 ) when the IGBT ( 3 ) comes into an ON...
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