Patent application number | Description | Published |
20090134702 | DC CONVERTER WITH INDEPENDENTLY CONTROLLED OUTPUTS - A DC converter comprises a single primary circuit which is coupled to each of a plurality of output circuits in respective time periods, the coupling being provided by switching in the output circuits. Each output circuit produces a respective output voltage and a respective feedback signal which is coupled as a control signal to the primary circuit during the respective time periods, so that each output voltage is regulated substantially independently of each other output voltage. The time periods for the different output circuits can be equal or different, and can be dynamically changed depending on error voltages of the output circuits. | 05-28-2009 |
20100290255 | DC CONVERTER WITH INDEPENDENTLY CONTROLLED OUTPUTS - A power supply includes a transformer having a primary winding and one or more secondary windings. The power supply also includes a primary switch coupled to the primary winding, a control unit coupled to control the primary switch, and N output circuits each to provide a respective one of N output voltages. N is an integer greater than one. Each of the N output circuits also includes a feedback circuit to produce a respective feedback signal representative of the respective one of N output voltages to the control unit to regulate the respective one of N output voltages. The power supply also includes a switching arrangement coupled to the N output circuits. The switching arrangement is to selectively couple each of at least N−1 of the N output circuits to a respective one of the one or more secondary windings during a respective time period. The switching arrangement is to couple the respective feedback signal representative of the respective one of the N output voltages to the control unit during the respective time period. | 11-18-2010 |
20120218784 | DC CONVERTER WITH INDEPENDENTLY CONTROLLED OUTPUTS - A controller for use in a power supply includes a clock coupled to output a clock signal. The clock signal determines a frequency. A modulator is coupled to receive the clock signal. The clock signal is divided into N cycles within the power supply. N is an integer greater than one. The modulator is coupled to receive N feedback signals from N output circuits during each respective one of the N cycles to control conduction times of a primary switch during each respective one of the N cycles to regulate N outputs of a power supply. Each of the N feedback signals is representative of a respective one of N output voltages of a respective to one of the N outputs of the power supply. | 08-30-2012 |
20120262954 | OFF LINE RESONANT CONVERTER WITH MERGED LINE RECTIFICATION AND POWER FACTOR CORRECTION - An off line resonant converter with improved power factor and merged line rectification is disclosed. An example off line resonant converter includes a boost storage inductance circuit to be coupled to receive an ac input line voltage. A switcher circuit is coupled to the boost storage inductance circuit. The switcher circuit includes stacked first and second passive switching devices coupled to the boost storage inductance circuit. The switcher circuit further includes stacked first and second active bidirectional switching devices coupled to the stacked first and second passive switching devices. The stacked first and second active bidirectional switching devices are controlled to generate a square wave signal and to alternately store energy in and receive energy from the boost storage inductance circuit such that a pulsating current is conducted between the boost storage inductance circuit and the switcher circuit. The pulsating current is bidirectional and flows in a first direction when the ac input line voltage is at a first polarity. The pulsating current flows in an opposite second direction when the ac input line voltage is at a second polarity. A resonant circuit is coupled to an output of the switcher circuit to receive the square wave signal from the switcher circuit to generate an output of the resonant converter. | 10-18-2012 |
20130329462 | POWER LIMITING BY MODULATING CLOCK - A clock generation circuit for use in a power converter controller includes a modulation signal generator that is coupled to generate a modulation signal in response to an input sense signal representative of an input voltage of a power converter. The modulation signal is responsive to the input sense signal when the input sense signal is greater than a first input threshold. A clock modulator circuit is coupled to receive the modulation signal and a first clock signal from an oscillator. The clock modulator circuit is coupled to generate a second clock signal in response to the first clock signal and the modulation signal. An average frequency of the second clock signal is responsive to the modulation signal. | 12-12-2013 |