Bernacchia
Giuseppe Bernacchia, Noventa Padovana IT
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20090323375 | Discontinuous Conduction Mode Control Circuit and Method for Synchronous Converter - Circuit and method for controlling a synchronous power converter in discontinuous conduction mode with increased efficiency is disclosed. Circuitry is provided outputting gating signals to a high side driver and a synchronous rectifier responsive to a pulse width modulated input signal, an inhibit circuit for inhibiting the gating signal to the synchronous rectifier upon detection of a zero crossing condition; a comparator receiving a measured circuit value from the synchronous converter and a reference value and outputting a zero crossing condition; and a duty cycle observer circuit for determining the average duty cycle of the pulse width modulated input signal and for varying the reference value. A method is disclosed determining if the average duty cycle in the pulse width modulated input signal is increasing in response to varying a reference value, and inhibiting a synchronous rectifier control signal when the comparator indicates a zero crossing condition. | 12-31-2009 |
20100079181 | SAMPLE-POINT ADJUSTMENT IN A SWITCHING CONVERTER - An apparatus and method of generating a drive signal for a switch in a switching converter having input terminals for applying an input voltage, output terminals for providing an output signal, and at least one inductive storage element coupled to the switch. The method includes sampling the output signal to provide a sampled output signal, and generating a pulsewidth modulated drive signal having a duty cycle that is dependent on the sampled output signal, wherein the output voltage is sampled at sampling times that are dependent on the duty cycle. | 04-01-2010 |
20100244803 | Switching Converter with Plural Converter Stages having Calibrated Current Uptake - A switching converter according includes a control arrangement to furnish a control signal dependent on the output voltage, as well as a first and at least one second converter stage. Each converter includes an inductive storage element, a ramp signal generator to furnish a signal having a ramp slope, a pulse width modulator which receives the control signal and the ramplike signal and which furnishes a pulse width modulated signal, and a driver circuit which receives the pulse width modulated signal and the input voltage and which applies the input voltage to the inductive storage element depending on the pulse width modulated signal. The ramp slope of the ramplike signal of the at least one second converter stage is adjustable. The ramp signal generator of the second converter stage receives a calibration signal which depends on the inductance of the inductive storage element of the first converter stage. | 09-30-2010 |
Giuseppe Bernacchia, Padova IT
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20090021271 | Measuring the On-Resistance of a Transistor Load Path - Methods, and apparatuses for performing them, including applying a control signal to a control terminal of a transistor, to switch the transistor to an on-state such that the transistor carries a load current through a load-path of the transistor; measuring a voltage drop across the load-path of the transistor while the load current is passing through the load-path of the transistor, yielding a first measurement value; feeding a test current into the load-path of the transistor, such that the test current and the load current are combined; measuring a voltage drop across the load-path of the transistor while the combined test and load currents are passing through the load-path of the transistor, a second measurement value; and determining an on-resistance of the load-path of the transistor from a difference of the first and second measurement values. | 01-22-2009 |
20090295356 | Output ripple control circuit and method for a PWM system - An output ripple control circuit and method for a PWM system uses a hysteresis threshold to clamp the output ripple of the PWM system such that the output ripple will not vary with the dc level of the output voltage, and therefore the output ripple control may be combined into any main loop technologies. | 12-03-2009 |
Giuseppe Bernacchia, Noventa IT
Giuseppe Bernacchia, Redondo Beach, CA US
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20130027009 | Switching Regulator with Increased Light Load Efficiency - A switching regulator includes a multiphase converter which includes a plurality of main phases configured to covert a power supply voltage to a lower voltage for application to an electronic device at different load conditions. The switching regulator also includes an auxiliary phase configured to operate in a pulse frequency modulation mode during a light load condition so that power is supplied to the electronic device by at least the auxiliary phase during the light load condition. | 01-31-2013 |
20140002037 | Switching Regulator Cycle-by-Cycle Current Estimation | 01-02-2014 |
20140015500 | MULTIPHASE DIGITAL CURRENT MODE CONTROLLER WITH DYNAMIC CURRENT ALLOCATION - A multiphase switching regulator includes a power stage with at least a first phase and a second phase for supplying power to a load through inductors coupling the phases to the load. The multiphase switching regulator is operated by switching the first phase at a higher switching frequency than the second phase via pulse width modulation (PWM) signals provided to the phases. A phase-specific target current is generated for each phase at the switching frequency for that phase based on the difference between an output voltage of the power stage and a reference voltage. The current in the inductors coupling the phases to the load is sensed, and a duty cycle of the PWM signal provided to each phase is adjusted based on the phase-specific target current and sensed inductor current for that phase. | 01-16-2014 |
20150061619 | Switching Regulator with Increased Light Load Efficiency in Pulse Frequency Modulation Mode - A switching regulator includes a multiphase converter which includes a plurality of main phases configured to covert a power supply voltage to a lower voltage for application to an electronic device at different load conditions. The switching regulator also includes an auxiliary phase configured to operate in a pulse frequency modulation mode during a light load condition so that power is supplied to the electronic device by at least the auxiliary phase during the light load condition. | 03-05-2015 |
Giuseppe Bernacchia, Porcia IT
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20150077081 | System and Method for a Switch Driver - In accordance with an embodiment, switch driver includes a first switch driver configured to be coupled to a control node of a first switch, a second driver configured to be coupled to a control node of a second switch, and a first terminal and a second terminal configured to be couple to a boot capacitor. The first terminal is coupled between a boot input of the first switch driver and the second terminal is configured to be coupled to outputs of the first switch and the second switch. The switch driver further includes a voltage measurement circuit coupled to the first terminal and the second terminal, and a control circuit configured to activate the second switch driver when the voltage measurement circuit indicates that a voltage across boot capacitor is below a first threshold. | 03-19-2015 |
Giuseppe Bernacchia, Villach AT
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20150236595 | Switching Power Converter Current Sensing with Phase Current Estimator - A phase current estimator for a switching power converter includes analog circuitry for generating a phase current estimate error by comparing a phase current of the switching power converter to an analog representation of an estimate of the phase current. The phase current estimator further includes digital circuitry for revising the phase current estimate based on the phase current estimate error and a plurality of parameters associated with operation of the switching power converter. An estimator fault detection unit is provided for determining whether a difference between the phase current and estimate exceeds a threshold for indicating substandard phase current estimation. | 08-20-2015 |