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8169803 |
Power transistor chip with built-in junction field effect transistor and application circuit thereof
A power transistor chip and an application circuit thereof have a junction field effect transistor to act as a start-up circuit of an AC/DC voltage converter. The start-up circuit can be turned off...
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8169207 |
Power supply device including a clamping portion to limit and error voltage and electronic appliance provided therewith
A power supply device has an error amplifier producing an error voltage by amplifying a difference between a feedback voltage according to an output voltage and a predetermined reference voltage,...
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8169802 |
Switch controller of a converter with a soft start signal generator comprising a plurality of current sources
Disclosed are a switch controller, a switch control method, a converter using the same, and a driving method thereof. A first voltage is generated by using a voltage that is input to an input...
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8159842 |
Power converter
The present invention discloses a power converter with extremely low standby power consumption for converting an input AC power to an output DC power, comprising: a DC supply voltage generating...
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8149602 |
Method and apparatus for detecting end of start up phase
A PSE configured to determine the end of the start up phase at the PD responsive to a condition of the voltage at the PSE output. In one particular embodiment, the startup phase end is determined...
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8143954 |
Oscillation device with auxiliary oscillating means
A device can be coupled to an electrical load for supplying electrical power to the electrical load. The device contains an oscillator unit and an auxiliary oscillator unit. The oscillator unit is...
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8129965 |
Quick-start low dropout regulator
A low dropout regulator includes an error amplifier, an N-type depletion MOSFET, a first switch, a second switch, a low-pass filter resistor, and a low-pass filter capacitor. By switching on both...
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8129963 |
DC to DC converter
The invention relates to a DC to DC converter comprising a DC to DC converter unit (DCW), a first field effect transistor (FET1) for the voltage conversion, a bipolar transistor (BP1) as a starting...
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8120343 |
Switching power supply and semiconductor device used for the same
According to the present invention, it is possible to prevent an overcurrent from passing through a switching element 1 during overcurrent protection and reduce power consumption during standby...
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8116106 |
Method and apparatus to select a parameter/mode based on a measurement during an initialization period
Techniques are disclosed to select functional parameters and/or operating modes of a circuit based on a measurement during an initialization period. In one aspect an integrated circuit includes a...
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8111529 |
Over current protection circuit and power converter using the same
An over current protection circuit and a power converter using the same. The over current protection circuit includes a soft start cell and an operational amplifier. The soft start cell outputs a...
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8106644 |
Reference circuit with start-up control, generator, device, system and method including same
A reference generator circuit generates a reference signal for use by a regulator in generating operational power for circuits and devices. A start-up circuit includes a self-biased voltage...
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8084893 |
Semiconductor device for controlling switching power supply
A semiconductor device controls a switching power supply. The semiconductor device includes a current inflow terminal; a starter circuit to cause a starting current to flow from the current inflow...
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8072783 |
Input circuit for a switch-mode power supply
The invention relates to an input circuit for a logic circuit part, comprising a voltage converter component for conversion of a mains voltage to the required low voltage in order to supply a user...
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8072784 |
Electronic device and power supply unit thereof
An exemplary electronic device includes a controller, a first convertor, a second convertor, and a switching unit. The first convertor is configured for receiving a first voltage from an external...
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8054656 |
Switching control circuit for a switching power converter
A switching control circuit is coupled to a switching device and an auxiliary winding of a transformer, wherein a primary winding of the transformer is coupled to the switching device. The...
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8050062 |
Method and system to allow for high DC source voltage with lower DC link voltage in a two stage power converter
A system for supplying AC power from a DC power source, such as a photovoltaic array is disclosed. The system includes a converter and an inverter coupled by a DC link. Control methods and systems...
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8045348 |
Switching mode power supply controller with high voltage startup circuits
A controller for a switching mode power supply includes two semiconductor chips. The first semiconductor chip has a high-voltage startup transistor coupled to a high voltage supply input terminal...
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8036003 |
Switching power supply device and electrical apparatus using the same
The present invention provides a switching power supply device capable of automatically restarting an electrical apparatus without a user operation when a voltage of the electrical apparatus or an...
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8031494 |
Method and apparatus for providing an initial bias and enable signal for a power converter
The invention relates to a switch-mode power converter including a bias circuit. A power converter power transformer includes a magnetic core. The switch-mode power converter power transformer also...
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8018740 |
LLC soft start by operation mode switching
An embodiment of the invention provides a method of reducing surge current in an LLC converter. The LLC converter comprises a switching circuit having a first switch and a second switch, a resonant...
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7982415 |
Discharge lamp lighting apparatus
A discharge lamp lighting apparatus includes a switch circuit for DC/AC converting, a discharge lamp connected to a secondary winding of a transformer, a current detector detecting an AC output...
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7982439 |
System for energy harvesting and/or generation, storage, and delivery
A device and method for harvesting, generating, storing, and delivering energy to a load, particularly for remote or inaccessible applications. The device preferably comprises one or more energy...
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7974110 |
Switching power supply unit and method for setting switching frequency
A switching power supply unit is provided which provides improved response for frequency switching with a smooth rise in voltage. The switching power supply unit includes: a rectifier circuit for...
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7957165 |
DC-DC converter with a plurality of soft-start control circuits
A DC-DC conversion circuit is configured by including a plurality of control signal generation circuits, a plurality of soft-start control circuits, and a start control circuit. The plurality of...
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7948780 |
Semiconductor device for switching power supply control, startup circuit, and startup method for switching power supply device
A semiconductor device for switching power supply control limits the startup current supplied from a high-voltage input terminal, and prevents heat generation and combustion in case of an anomaly....
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7924581 |
High voltage start-up circuit with constant current control
A high voltage start-up circuit with constant current control applied to a switching mode power converter is provided. The high voltage start-up circuit includes a high voltage junction transistor,...
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7907428 |
Digitally controlled current-mode switched power supply
Disclosed is a current mode switched power supply. The current mode switched power supply includes a switching element and a power stage coupled to the switching element and configured to provide,...
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7906945 |
Soft-start voltage circuit
A soft-start voltage circuit includes an operational amplifier, a first and a second capacitors, a first and a second switches, and a voltage level shifter. The operational amplifier includes a...
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7898830 |
System and method of controlling the soft start control voltage of switching regulator in response to output current sensing
An apparatus, such as a Buck converter system, for generating an output voltage while at the same time monitoring whether an overload or over current condition occurs at the output, and protecting...
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7894219 |
Method and apparatus of low current startup circuit for switching mode power supplies
A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a startup mode to a normal operation mode...
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7869234 |
Poly-phase AC/DC active power converter
A three-phase AC/DC active power converter provides an H-bridge that is controlled by a DSP (digital signal processing) controller that places the H-bridge in a voltage-boost mode of operation when...
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7868602 |
Power supply device and electronic appliance therewith
A power supply device includes a clamp circuit that increases the upper limit value of an error voltage stepwise after the device is started up. This makes it possible to shorten the rise time of...
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7868275 |
Switching circuit controlling multiple heating elements
A switching circuit including a plurality of heating elements (12), each connected as part of a tuned circuit (36), the tuned circuits being respectively tuned to different frequencies and...
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7864551 |
Power supply device with system switch circuit
A power supply device with a system switch circuit includes a primary power system, a stationary power system and a power management unit. The power management unit is triggered by a remote ON/OFF...
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7855532 |
Power supply circuit with control switches to voltage multiplier having same frequency as clock
A power supply circuit includes a first power supply configured to output a first voltage; a second power supply provided separately from the first power supply to output a second voltage; and a...
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7855899 |
Controller with loop impedance modulation for power converter
A control circuit is provided to generate a mode signal at light load of the power converter. The mode signal is coupled to disable the switching signal for saving power. The impedance of an input...
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7852642 |
Full digital soft-start circuit and power supply system using the same
A full digital soft-start circuit adapted for a power supply system is provided. The full digital soft-start circuit includes a ring oscillator, a pulse generator, a counter, and a multiplexer. The...
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7834601 |
Circuit and method for reducing output noise of regulator
A circuit and a method for reducing output noise when a pulse width modulation mode is started. A pulse width modulation circuit generates a first pulse signal having a duty cycle that is in...
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7834599 |
Rapid supply voltage ramp using charged capacitor and switch
In one embodiment, an apparatus is provided for a system including an integrated circuit coupled to a node to receive a supply voltage and having bypass capacitors coupled in parallel with the...
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7830683 |
Current control type converter
A current control type converter has a converter section and a control section that includes three controllers. A first controller calculates and outputs an active current instruction value by...
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7826238 |
Power system inhibit method and device and structure therefor
A power control system (25) uses two separate currents to control a startup operation of the power control system (25). The two currents are shunted to ground to inhibit operation of the power...
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7800926 |
Method of controlling a three level converter
A system and method are disclosed for controlling an inverter to provide an alternating inverter voltage to a load for a transition in which a change in active power (P) and/or reactive power (Q)...
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7782637 |
Switched-mode electronic power device
An electronic power device for controlling a load includes: a high-voltage integrated switch having an output terminal to be connected to the load; an integrated, and low-voltage driving circuit...
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7782640 |
Inverter circuit and backlight unit having the same
An inverter circuit according to an embodiment includes an input unit to which a first voltage is applied. In the inverter circuit, a transformer transforms the first voltage output from the input...
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7782038 |
Soft start circuit with slew rate controller for voltage regulators
In one embodiment, a soft start circuit includes a slew rate controller to limit inrush current to a voltage regulator during start up. The output voltage of the regulator may be compared to a...
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7764098 |
Start up circuit of power converter
A start up circuit of power converters is presented. It includes a first transistor, a resistive device, a second transistor, a third transistor and a diode. The first transistor is coupled to a...
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7764522 |
Circuit and method for controlling the start-up cycle of a power supply
The present invention discloses a method and a circuit for controlling a start-up cycle of an integrated circuit in a circuit system. The method and circuit determine whether or not an input power...
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7764524 |
Inverter for driving a load including a capacitive element in an input stage
The present invention provides an inverter with a simple configuration capable of preventing occurrence of excessive rush current. A current detection circuit detects an AC output current flowing...
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7760520 |
Current controlled switching mode power supply
A current controlled switching mode power supply is provided. A turn on/off time of a switching device is adjusted by controlling a leading edge blanking (LEB) time and an external drive current of...
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