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8184416 |
Inverter driver and lamp driver thereof
An inverter driver controls an inverter that supplies driving voltages to a plurality of discharge lamps. The inverter driver senses the abnormal operation of the plurality of discharge lamps based...
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8174480 |
Gate driver and display panel utilizing the same
A gate driver including a shift register, a level shifter, an output buffer, and a processing unit. The shift register generates a shifted signal. The level shifter generates a level signal...
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8154240 |
Control apparatus for electric railcar
A control apparatus for an electric railcar includes an inverter that exchanges power with an AC rotating machine, a filter capacitor connected in parallel to a DC side of the inverter, a filter...
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8145443 |
Fourier transform-based phasor estimation method and apparatus capable of eliminating influence of exponentially decaying DC offsets
Disclosed herein is a Fourier transform-based phasor estimation method and apparatus capable of eliminating the influence of exponentially decaying DC offsets. According to a Fourier...
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8143867 |
Electric power supply device
In an electric supply device of the present invention, since a semiconductor element T1 is interrupted before a drain voltage V1 of the semiconductor element T1 is lower than an in-phase input...
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8135974 |
Power on control device and method
A power on control device and method are used at an adaptor providing a constant voltage. The power on control device includes a first voltage converting circuit, a second voltage converting...
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8129948 |
Protective circuits for secondary battery packs
This invention discloses a charging/discharging protective circuit for a secondary battery pack, having an over-charging/discharging voltage comparator, a reference voltage source and a battery...
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8125189 |
Systems for charging a battery in a closed loop configuration
A system is provided for charging a battery with an AC adapter. The system includes a first closed loop electrical path between the battery and the AC adapter. The first closed loop electrical path...
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8116057 |
Data port transient protection apparatus and methods
Methods and apparatus for protecting data bus ports and their corresponding PHY devices from taking damage associated with excess voltage across one or more signal pairs during an intermittent...
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8106605 |
Backlight control circuit
An exemplary backlight control circuit includes a pulse width modulation integrated circuit (PWM IC) having a power input terminal, a power source capable of outputting an operation voltage, and a...
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8099610 |
Removable device for injecting electric power for an ethernet network
A device for injecting electric power for an Ethernet network comprising at least one switch, one switching board, communication ports, and Ethernet cables, the device including a power supply, a...
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8089264 |
Voltage measuring circuit
A voltage measuring circuit includes an under-voltage measuring circuit and an over-voltage measuring circuit. The under-voltage measuring circuit includes a first voltage comparator, a first zener...
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8063601 |
Motor driving circuit for adjusting speed of a motor by changing an output voltage
A motor driving circuit for adjusting speed of the motor by changing output voltage is disclosed. One end of the motor is coupled to a variable voltage source. The motor driving circuit includes a...
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8064179 |
Integrated circuit including a switching regulator design for power over Ethernet devices
A powered device includes an interface that is responsive to a powered network and an integrated circuit device that is coupled to the interface to receive power and data from the powered network....
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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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8031448 |
Input voltage clamp for a single-supply system
A system, apparatus and a method are described that provide a voltage clamp for a single-supply system. In particular, a negative voltage clamp prevents a negative over-voltage in a system having...
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8031449 |
Fast-responding short circuit protection system with self-reset for use in circuit supplied by DC power
A short circuit protection system includes an inductor, a switch, a voltage sensing circuit, and a controller. The switch and inductor are electrically coupled to be in series with one another. A...
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7965484 |
Device for protecting a speed controller against overcurrent
The invention relates to a speed controller comprising: a rectifier module (12) for generating a direct voltage on a power bus (10, 11) from an alternating voltage available on an electrical...
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7965069 |
Power converter and multiport power converter
The DC/DC converter is that which is constituted so as to have a failure detecting circuit in which a first capacitor and a second capacitor are connected in series, a plurality of switches are...
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7944661 |
Protection circuit, flat display device using the same, and method for driving flat display device using the same
A protection circuit which is capable of preventing a faulty operation resulting from an abnormal control signal a method for operating the same, a flat display device using the same, and a method...
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7944662 |
Multi-battery system for high voltage applications with proportional power sharing
A multi-battery system comprises a circuit having a circuit positive terminal and a circuit negative terminal. At least two batteries are provided to combine to deliver required system power. The...
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7944672 |
Control device for an actuator
A control device applicable to an actuator and including a voltage detection unit and a limit switch control unit. The control device is inbuilt inside the actuator without any additional control...
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7938548 |
Projection device
A projection device includes: a projector unit that has at least a light source and a projection optical system housed in a chassis; a control unit that is assembled with a chassis separate from...
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7932628 |
Control device with terminal 15—holding circuit
A terminal state of a terminal 15 of a vehicle is enabled to be maintained for a minimum period of time even after a drop in the voltage supply. At the same time other loads are to have no effect...
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7924084 |
Semiconductor device
A switching transistor has its drain and source respectively connected to a gate and a source of an output transistor for supplying output current to a load, and its gate connected to an internal...
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7898783 |
Methods and apparatus to reduce substrate voltage bounces and spike voltages in switching amplifiers
Methods and apparatus to reduce voltage bounces and spike voltages in switching amplifiers are disclosed. An example method of removing a substrate current from a substrate disclosed herein...
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7863871 |
Apparatus and method for monitoring for a maintain power signature (MPS) of a powered device (PD) in a power source equipment (PSE) controller
Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts...
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7843361 |
Traffic signal transfer switch with housing constructions
A transfer switch configured particularly for use with traffic signal controllers, to enable a traffic signal controller to be powered by a portable electrical generator, when utility line power is...
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RE41908 |
Power conversion integrated circuit and method for programming
A single input pin (48) provides multi-functional features for programming a power supply (10). By connecting the appropriate interface circuit (92, 100, or 112) to the single input pin (48), the...
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7821753 |
DC high power distribution assembly
A DC high power distribution system provides power to a load in parallel with one or more storage capacitors. The system includes a hot-swap controller and an array of parallel-connected...
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7813093 |
Output driver with overvoltage protection
An output driver in an integrated circuit includes a driver circuit operable by a power supply voltage and coupled to an output pad, and a driver power conditioner configured to generate a...
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7809864 |
Method and apparatus for a hot-swappable input/output device with programmable over-voltage clamp protection
A method and apparatus is provided for a configurable input/output (I/O) interface within an integrated circuit to support a plurality of I/O standards. The configurable I/O interface exhibits a...
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7804672 |
System and method for power good monitor for multiple information handling system power supplies
A switched power rail monitor compares voltages provided by a switched power rail and a power source to detect a predetermined differential indicative of a fault at the switched power rail. A...
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7800322 |
Isolation circuit for DC power sources
The electrical isolation circuit of the present disclosure includes a switch coupled between the DC power source and the electrical application and a comparator for controlling the switch by...
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7796050 |
Abnormal circuit operation detection system
An abnormality in operation is detected by meticulously monitoring the operation of a monitored device that comprises a state machine. The state number, indicating the state the monitored device is...
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7793115 |
Method and apparatus for operating a power feed in a computer system
Method, and apparatus for operating a power feed in a computing system. One exemplary embodiment includes monitoring the power feed to ensure the power level of the entire system never remains...
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7769497 |
Method of super super decoupled loadflow computation for electrical power system
A method of performing loadflow calculations for controlling voltages and power flow in a power network by reading on-line data of given/specified/scheduled/set network variables/parameters and...
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7737664 |
Battery protective device and semiconductor integrated circuit device
A battery protective device that protects against battery damage and semiconductor destruction from overdischarge and overcharge of the battery. Resistance across switching elements is controllable...
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7734955 |
Monitoring VRM-induced memory errors
A method and system for improving Field Replacement Unit (FRU) isolation in memory sub-systems by monitoring Voltage Regulator Module (VRM) induced memory errors. A comparator compares the output...
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7710076 |
Back-gate voltage generator circuit, four-terminal back gate switching FET, and charge and discharge protection circuit using same
A back-gate voltage generator circuit generating a back-gate voltage of a four-terminal back gate switching MOSFET for charge and discharge control is disclosed. The back-gate voltage generator...
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7710750 |
Inverter with time counting function
The inverter according to the invention includes a control microcomputer including a protector circuit that stops the inverter when an anomaly is caused, a counter that counts the driving clock...
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7701176 |
Protective circuits for secondary battery packs
This invention discloses a charging/discharging protective circuit for a secondary battery pack, having an over-charging/discharging voltage comparator, a reference voltage source and a battery...
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7685441 |
Power control unit with digitally supplied system parameters
Methods and apparatuses provide voltage regulation for a processor. Control or configuration parameters for a voltage regulator (VR) are provided digitally over a configuration bus to a VR...
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7683626 |
Circuit with an arrangement for the detection of an interrupted connecting line
A circuit arrangement includes a first and a second supply terminal for application of a supply voltage and an output terminal for providing an output signal. The circuit arrangement additionally...
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7675725 |
Constant voltage output circuit
A constant voltage output circuit has an output power transistor supplied with electric power form a first input power source and a control circuit supplied with electric power from a second input...
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7660089 |
Voltage rise suppression circuit and panel television
Included are a Zener diode D2 having a cathode connected onto a voltage output line, dividing resistors having one terminal connected to the anode of the Zener diode D2 and having the other...
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7643264 |
Power supply controller and method for controlling power supply circuit
A power supply controller includes detection circuits that are provided so as to correspond to a plurality of load circuits performing an operation by power output from a power supply circuit and...
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7642842 |
System and method for providing communication of over-current protection and current mode control between multiple chips in an integrated circuit
A system and method is disclosed for providing communication of an over-current protection signal and current mode control signals between a controller chip and a power chip in an integrated...
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7643918 |
Control apparatus for a vehicle equipment device
There is disclosed an apparatus for controlling a vehicle equipment device. The apparatus permits a reduction in the cost of manufacturing a vehicle in which the apparatus is installed. The...
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7629771 |
Protection device for non-common ground buses
A protection device for non-common ground buses is disclosed. The protection circuit includes a controller, a level shifter, a first group of switches, and a second group of switches. The...
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