Patent application number | Description | Published |
20090086513 | Control method and device for switching power supplies - A control device for controlling a switching power supply adapted to convert an input voltage into an output voltage according to a switching rate of a switching element. The control device includes first control means for switching the switching element in a first working mode at a constant frequency and second control means for switching the switching element in a second working mode at a variable frequency, under a maximum frequency, in response to the detection of a predefined operative condition of the switching power supply. The control device further includes means for selecting the first working mode or the second working mode. | 04-02-2009 |
20090140712 | SELF-SUPPLY CIRCUIT AND METHOD FOR A VOLTAGE CONVERTER - An embodiment of a self-supply circuit, for a voltage converter that converts an input voltage into an output voltage and has a main switch and a controller, designed to control switching of the main switch for controlling the output voltage; the self-supply circuit is provided with: a charge accumulator, which is connected to the controller and supplies a self-supply voltage to the same controller; a generator, which supplies a charge current to the charge accumulator; and an auxiliary switch, which has a first conduction terminal in common with a respective conduction terminal of the main switch and is operable so as to control transfer of the charge current to the charge accumulator. In particular, the self-supply circuit is provided with a precharge stage, connected to the auxiliary switch, which carries out a precharging of an intrinsic capacitance of the auxiliary switch before a turning-off transient of the main switch ends. | 06-04-2009 |
20090141520 | ISOLATED VOLTAGE CONVERTER WITH FEEDBACK ON THE PRIMARY WINDING, AND CORRESPONDING METHOD FOR CONTROLLING THE OUTPUT VOLTAGE - An embodiment of a voltage converter, designed to convert an input voltage into a regulated output voltage, having: a voltage transformer having a primary winding receiving the input voltage, a secondary winding supplying the output voltage (V | 06-04-2009 |
20090147546 | ISOLATED VOLTAGE CONVERTER WITH FEEDBACK ON THE PRIMARY WINDING AND PASSIVE SNUBBER NETWORK, AND CORRESPONDING CONTROL METHOD - An embodiment of a voltage converter, provided with: a voltage transformer having a primary winding receiving an input voltage, a secondary winding supplying an output voltage, and an auxiliary winding supplying a feedback voltage correlated to the output voltage; a main switch, connected to the primary winding; a control circuit, which controls switching of the main switch and has a sampling stage for sampling and holding the feedback voltage and supplying a sampled signal; and a voltage limiting circuit, provided with a clamp capacitor, designed to be connected across the primary winding. A sampling control stage is connected to the sampling stage, and is designed, during a given operating condition of the voltage converter, to enable updating of the sampled signal on the basis of a state of charge of the clamp capacitor. | 06-11-2009 |
20090175057 | ISOLATED VOLTAGE CONVERTER WITH FEEDBACK ON THE PRIMARY WINDING, AND CORRESPONDING METHOD FOR CONTROLLING THE OUTPUT VOLTAGE - An embodiment of a voltage converter includes: voltage-transformer means having a primary side, designed to receive an input voltage, and a secondary side, designed to supply an output voltage; control-switch means coupled to said primary side; and a control circuit, coupled to a control terminal of said control-switch means and designed to control switching thereof as a function of a first signal correlated to said output voltage; said control circuit being provided with an error-amplifier stage, designed to process a difference between said first signal and a reference signal, wherein said error-amplifier stage is configured so as to have a transconductance characteristic with a linear-operation region, having a given slope, and at least one first clamped region, which has a slope lower than said given slope and is contiguous to said linear-operation region. | 07-09-2009 |
20100141326 | DRIVER CIRCUIT AND METHOD FOR REDUCING ELECTROMAGNETIC INTERFERENCE - An apparatus and a method switch a load through a power transistor. The apparatus includes: a first current generator for generating a current to charge a capacitance of a control terminal of the power transistor during power on of the power transistor; a second current generator for generating a current to discharge the capacitance during power off of the power transistor. The apparatus is equipped with control circuitry having a storage element for storing a voltage value representative of the potential difference between the control terminal and a conduction terminal of the power transistor when the power transistor operates in the saturation region and a discharge circuit for generating an additional current to discharge the capacitance during the power-off process. The additional current is a function of the potential difference of the control terminal and the stored voltage value from the conduction terminal. | 06-10-2010 |
20100164443 | METHOD FOR CONTROLLING A SWITCHING REGULATOR AND RELATED SWITCHING REGULATOR - An embodiment of a power-supply controller comprises a switching-control circuit, an error amplifier, and a signal generator. The switching-control circuit is operable to control a switch coupled to a primary winding of a transformer, and the error amplifier has a first input node operable to receive a feedback signal, a second input node operable to receive a comparison signal, and an output node operable to provide a control signal to the switching-control circuit. The signal generator is operable to generate either the feedback signal or the comparison signal in response to a compensation signal that is isolated from a secondary winding of the transformer and that is proportional to a load current through a conductor disposed between the secondary winding and a load. | 07-01-2010 |
20100329364 | TRANSMISSION AND RECEPTION APPARATUS FOR DIGITAL SIGNALS - A transmission and reception apparatus for at least one digital data signal is described. The digital data signal is characterized by two logical levels, first and second logical levels, with said second logical level higher than the first logical level. The apparatus comprises a transmitter, a receiver and a galvanically isolated interface arranged between the transmitter and the receiver; said transmitter, receiver and interface are arranged so as to form a two-level isolated digital channel and the transmitter comprises a block adapted to send a clock signal to the receiver. The receiver comprises, a circuit adapted to synchronize the receiver and the transmitter using the received clock signal and a circuit adapted to memorize information related to the synchronization in a storage element to hold the synchronization while the receiver is receiving said digital data. The transmitter block is adapted to send said digital data signal after the synchronization of the receiver and transmitter. | 12-30-2010 |
20110026544 | SIGNALS COMMUNICATION APPARATUS - A signal communication apparatus comprising first and second channels for communicating signals between two electronic devices; each of said first and second channels has a transmitter for transmitting signals, a receiver for receiving signals and an interface arranged between the transmitter and the receiver. The transmitters code the signals in the form of a frame of H bits, with H being an integer, and adapted to serially transmit said frame of H bits through said interface, and the receivers decode the frames of H bits, a frame of H bits having P data bits, K redundancy bits and a sequence of L control bits adapted to identify the type of frame to be transmitted, with L, P and K being integers. | 02-03-2011 |
20110026612 | RECEIVER FOR SIGNAL COMMUNICATION APPARATUS AND RELATED SIGNAL COMMUNICATION APPARATUS - A receiver of a signal communication apparatus; the apparatus including a transmitter adapted to transmit coded signals, the receiver for receiving the signal and a wireless interface interposed between the transmitter and the receiver and having a transmitting antenna and a receiving antenna. The receiver includes a decoder configured to decode the received signal and circuitry coupled to the receiving antenna and capable of triggering the decoder if the value of the received signal is outside a logical hysteresis having a first logic threshold having a value smaller than the value of the direct current component of the received signal and a second logic threshold having a value greater than the value of the direct current component of the received signal. | 02-03-2011 |
20110028104 | RECEIVER FOR SIGNAL COMMUNICATION SYSTEM WITH DISTURBANCE REJECTION CIRCUIT - A receiver of a signal communication apparatus; the apparatus having a transmitter for transmitting the signals, the receiver for receiving the signals and a galvanically isolated wireless interface interposed between the transmitter and the receiver and having a transmitting antenna and a receiving antenna. The receiver including a disturbance rejection circuit coupled to the receiving antenna and capable of compensating for the parasite currents flowing between the transmitting antenna and the receiving antenna at the potential variations between the input and output of the galvanic isolation interface. | 02-03-2011 |
20110170319 | METHOD FOR CONTROLLING A SWITCHING REGULATOR AND RELATED SWITCHING REGULATOR - An embodiment of a power-supply controller comprises a switching-control circuit, an error amplifier, and a signal generator. The switching-control circuit is operable to control a switch coupled to a primary winding of a transformer, and the error amplifier has a first input node operable to receive a feedback signal, a second input node operable to receive a comparison signal, and an output node operable to provide a control signal to the switching-control circuit. The signal generator is operable to generate either the feedback signal or the comparison signal in response to a compensation signal that is isolated from a secondary winding of the transformer and that is proportional to a load current through a conductor disposed between the secondary winding and a load. | 07-14-2011 |
20110175650 | DRIVER CIRCUIT AND METHOD FOR REDUCING ELECTROMAGNETIC INTERFERENCE - An apparatus and a method switch a load through a power transistor. The apparatus includes: a first current generator for generating a current to charge a capacitance of a control terminal of the power transistor during power on of the power transistor; a second current generator for generating a current to discharge the capacitance during power off of the power transistor. The apparatus is equipped with control circuitry having a storage element for storing a voltage value representative of the potential difference between the control terminal and a conduction terminal of the power transistor when the power transistor operates in the saturation region and a discharge circuit for generating an additional current to discharge the capacitance during the power-off process. The additional current is a function of the potential difference of the control terminal and the stored voltage value from the conduction terminal. | 07-21-2011 |
20110199794 | METHOD FOR CONTROLLING A SWITCHING REGULATOR AND RELATED SWITCHING REGULATOR - An embodiment of a power-supply controller comprises a switching-control circuit, an error amplifier, and a signal generator. The switching-control circuit is operable to control a switch coupled to a primary winding of a transformer, and the error amplifier has a first input node operable to receive a feedback signal, a second input node operable to receive a comparison signal, and an output node operable to provide a control signal to the switching-control circuit. The signal generator is operable to generate either the feedback signal or the comparison signal in response to a compensation signal that is isolated from a secondary winding of the transformer and that is proportional to a load current through a conductor disposed between the secondary winding and a load. | 08-18-2011 |
20140133195 | CONTROL METHOD AND DEVICE FOR SWITCHING POWER SUPPLIES HAVING MORE THAN ONE CONTROL MODE - A control device for controlling a switching power supply adapted to convert an input voltage into an output voltage according to a switching rate of a switching element. The control device includes first control means for switching the switching element in a first working mode at a constant frequency and second control means for switching the switching element in a second working mode at a variable frequency, under a maximum frequency, in response to the detection of a predefined operative condition of the switching power supply. The control device further includes means for selecting the first working mode or the second working mode. | 05-15-2014 |