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7292017 |
Capacitor insulating power supply
Switching elements M 1 , M 2 , M 3 are connected in series between the positive and negative lines carrying DC current supplied through a rectifier circuit 2 from an AC power supply 1 or...
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7292018 |
Reverse current preventing circuit with an automatic correction of reference
A synchronous switching voltage converter has a first switch, a second switch, and an inductor, coupled together to a switch node. A reverse current preventing circuit has a fixed reference current...
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7285930 |
Method and device for controlling a multiphase electronically commutated motor
A method is specified for controlling a multiphase motor that is commutated by an inverter-side bridge circuit, in the course of which a particularly precise and technically simple detection of a...
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7282900 |
Performance controller for a step down current mode switching regulator
A method of regulating an output voltage by utilizing a switching regulator, where the switching regulator includes a high side switch, a low side switch having an active diode, a controller...
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7282894 |
Method and apparatus for performing lossless sensing and negative inductor currents in a high side switch
A current sensing circuit for use in a switching regulator having a high-side switch. The current sensing circuit includes a first sensing circuit coupled to the high-side switch for measuring...
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7282898 |
Integrated circuit capable of balanced polyphase power regulation using redundant feedback circuitry
A method according to one embodiment may include providing a redundant feedback circuit. The method of this embodiment may also include coupling the redundant feedback circuit to a feedback control...
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7279874 |
Power supply device with dead-time control and printing apparatus having the same
In a power supply device including a PWM-controlled DC/DC converter which changes an output voltage on the basis of a setting signal, and a control unit, the DC/DC converter includes a circuit for...
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7279879 |
Current waste suppressing power supply apparatus
A power supply apparatus supplies power to one of an interior circuit and external instruments. The power supply apparatus includes a voltage regulator that regulates and outputs a constant voltage...
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7276861 |
System and method for driving LED
A system drives one or plurality of LEDs regulating their brightness by controlling LEDs average current or voltage. The system includes a switching power converter and an integrated digital...
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7276888 |
Precharge circuit for DC/DC boost converter startup
An integrated circuit including a precharge circuit for a DC/DC boost converter which includes a reference current circuit with a MOSFET transistor (MP 4 ) that has a gate connected with the gate...
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7274180 |
Constant voltage outputting method and apparatus capable of changing output voltage rise time
A constant voltage outputting apparatus includes an input terminal, an output terminal, a control unit, a plurality of output control transistors, and a switching unit. The input terminal receives...
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7274179 |
Inrush current preventing circuit
There is provided an inrush current preventing circuit. The circuit comprises an voltage-controlled type switching device that has an input terminal, an output terminal and a control terminal that...
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7268525 |
Buck-boost converter
A buck-boost converter includes: a buck converter section including a first switch, a first rectifier, and an inductor; a boost converter section sharing the inductor and including a second switch,...
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7268524 |
Voltage regulator with adaptive frequency compensation
A voltage regulator includes a first and second amplifier stage, an output stage, and a variable zero circuit. The first amplifier stage is coupled to receive a reference voltage and introduces a...
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7268410 |
Integrated switching voltage regulator using copper process technology
Improvements in the level of integration of a core buck and/or boost DC-DC voltage regulator sub-circuit lead to a lower manufacturing cost structure, an improved performance from lessened...
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7265679 |
Apparatus and method for indicating onset of high-voltage at an output locus of a signal converter device
An apparatus for indicating detection of an onset of a high-voltage condition at an output locus of a signal converter device, the signal converter device including a switching network for...
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7265527 |
Direct current multiplier
A self-oscillating DCM is disclosed comprising two inductors that charge and discharge 180 degrees out of phase such that the charging inductor is conducting an upward ramping current and the...
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7265525 |
Self-driven scheme for synchronous rectifier having no body diode
A voltage converter uses a component such as a JFET or four-terminal power MOSFET having no body diode and exhibiting no body diode conduction characteristic as a synchronous rectifier to reduce...
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7262588 |
Method and apparatus for power supply controlling capable of effectively controlling switching operations
A switching regulator includes a first switching element to perform a switching operation in accordance with a first control signal input thereto to control an output voltage based on an input...
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7262584 |
Efficient fast pulsed laser or light-emitting diode driver
A capacitor is connected to the output of a multiphase power converter, and a current-driven device (e.g., LED or laser diode) is also connected to the power converter output. A solid state switch...
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7262589 |
Pulse width modulation power regulator and power supply system thereof
A pulse width modulation (PWM) power regulator and a power supply system thereof are disclosed. The power supply system includes a central controller having a soft-starting circuit and at least one...
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7262587 |
Circuit and method for controlling DC-DC converter
A control circuit for suppressing generation of inrush current during activation of a DC-DC converter, which controls output with control signals. The control circuit includes first and second...
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7259603 |
Switch mode power converter
A switch mode power converter is provided which includes a switching cell with a supply input, an output and a control input. A summing comparator has first and second differential input pairs and...
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7259542 |
System and method for controlling bidirectional three-phase DC/DC converter
Disclosed are an apparatus and method for controlling a Direct Current (DC)/DC converter which controls energy flow between a first DC source and a second DC source to eliminate a high-frequency...
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7256569 |
Apparatus and method for continuous conduction mode boost voltage power factor correction with an average current control mode
The continuous conduction mode (CCM) boost voltage power factor correction apparatus with an average-current control mode of the present invention uses resettable integrators to integrate the...
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7253540 |
Method for operating a parallel arrangement of semiconductor power switches
The invention relates to a method for statically balancing the loading of power semiconductor switches (S 1 , S 2 , S 3 ) in a parallel circuit ( 1 ). To achieve this in prior art, switching...
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7253596 |
Power supply apparatus capable of supplying a stable converted voltage
A power supply apparatus switchably operates an LDO regulator and a DC/DC converter connected in parallel so as to control a battery voltage Vbat from a power supply at a constant output voltage...
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7250744 |
Quasi average current mode control scheme for switching power converter
A quasi average current mode control scheme is provided. The control scheme allows only detecting one part of the inductor current of the switching converter to control the inductor current and...
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7248028 |
Low-power charge pump regulator
A low-power charge pump regulator is provided. The low-power charge pump regulator may periodically turn off charge pumping portions of the charge pump circuitry to reduce power consumption. The...
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7248027 |
Power converters in which the input power coupling times are adjusted in conjunction with cycle skip counts
In a power converter, an input power source ( 98 ) is intermittently coupled to provide a current flow (Icoil) in consecutive cycles (T) to generate an output voltage (Vo). The coupling durations...
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7247996 |
Projector
The present invention is directed to decrease temperature rise in a power supply circuit in a standby mode by using existing signals and circuits while suppressing cost. In a power supply circuit...
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7245090 |
Switching LED driver with temperature compensation to program LED current
The present invention provides a LED driver for control the brightness of the LED. An energy-transferred element and a switch are connected in series with the LED for controlling the current of the...
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7245115 |
Low drop out voltage regulator
A low dropout voltage regulator apparatus is disclosed, which includes a low dropout voltage regulator circuit connected to a supply voltage, wherein at least one input voltage is input to the low...
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7245089 |
Switching LED driver
The present invention provides a LED driver for controlling the brightness of the LED. An inductor and a switch are connected in series with the LED for controlling the current of the LED. A diode...
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7245114 |
DC-to-DC step-up converter and conversion method thereof
The present invention discloses a DC-to-DC step-up converter to which a logic control unit is added in order to reduce the ripples of a DC output voltage and improve the power quality. The...
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7242169 |
Method and apparatus for voltage compensation for parasitic impedance
An apparatus and method for regulating a voltage to a load to compensate for one or more parasitic impedances. A first amplifier measures the voltage drop due to a first parasitic impedance, and a...
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7238992 |
Semiconductor circuit for DC-DC converter
In a semiconductor integrated circuit for a DC—DC converter, an nMOS-type transistor Qn of a CMOS inverter 1 c constituting a driver 1 is electrically floated from a substrate 12 through an...
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7239116 |
Fine resolution pulse width modulation pulse generator for use in a multiphase pulse width modulated voltage regulator
Disclosed is a fine resolution pulse width generator for use in a multiphase pulse width modulated voltage regulator. The fine pulse width is generated by first generating a pulse with a coarse...
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7239115 |
Digital pulse width modulation controller with preset filter coefficients
A switched mode voltage regulator includes a digital control system having a digital filter with a plurality of preset filter coefficients that can be selectively loaded into the digital filter to...
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7235958 |
Apparatus and method to synchronize switching frequencies of multiple power regulators
A power supply has a plurality of switching regulators providing a like plurality of regulated output voltages. The oscillators of the switching regulators are synchronized with one another by a...
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7233133 |
High-efficiency two-step DC-to-DC converter
A two-step DC-to-DC converter comprises a first converter stage for converting a first voltage to a second voltage, and a second converter stage for converting the second voltage to an output...
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7233469 |
Components having actively controlled circuit elements
Protection and filtering functions are provided for external circuits by internal circuits that use controlled elements.
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7233462 |
Voltage regulator having overcurrent protection circuit
An overcurrent protection circuit for a voltage regulator has a first transistor having a gate for connection to a gate of an output transistor of the voltage regulator, a resistor connected to a...
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7230838 |
Active damping control for a switch mode power supply
Methods and apparatus are disclosed for suppressing circuit noise due to parasitic elements in switch mode power supplies. The presented embodiments use actively controlled damping devices such as...
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7230408 |
Pulse frequency modulated voltage regulator with linear regulator control
A PFM-type voltage regulator circuit converts an unregulated input voltage into a regulated output voltage using a first transistor controlled by a pulse control circuit and a second transistor...
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7230500 |
Synchronous delay-line amplification technique
An open-loop switching amplifier achieves synchronous operation using a ring oscillator based upon a tapped delay line. A counter is clocked from the ring oscillator, periodically comparing...
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7230405 |
Non-isolated power conversion system having multiple switching power converters
A non-isolated power conversion system has an input stage and an output stage. A plurality of cascaded switching power converter stages are coupled between the input stage and the output stage....
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7227652 |
Switching power supply, method of operation and device-and-power-supply assembly
A switching power supply, with or without a secondary side controller, is connectable to a power-supply-using device (such as a printer without a power supply) receiving a voltage from the...
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7227344 |
Switching DC-DC converter with improved stabilization
The switching DC-DC converter comprises an inductor, a control circuit with an oscillator and an output stage, the output stage being coupled to the inductor, a diode coupled to the inductor, and a...
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7224149 |
Current resonance type DC/DC converter capable of decreasing losses on no-load and a light load
In a control circuit for controlling a current resonance type DC/DC converter, a negative voltage detection arrangement produces a pulse while a both-ends voltage of a resonance capacitor has a...
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