Systems and methods for constant current control with primary-side sensing and regulation in various operation modes
First Claim
1. A system for regulating a power converter, the system comprising:
- a voltage-to-current-conversion component configured to generate a first current signal;
a current-signal generator configured to generate a second current signal;
a capacitor coupled to the current-signal generator and coupled, through a switch, to the voltage-to-current-conversion component, the capacitor being configured to generate a voltage signal;
a comparator configured to process information associated with the voltage signal and a sensed signal and generate a comparison signal based on at least information associated with the voltage signal and the sensed signal, the sensed signal being associated with a primary current flowing through a primary winding coupled to a secondary winding for a power converter;
a modulation-signal generator configured to receive at least the comparison signal and generate a modulation signal; and
a gate driver configured to receive the modulation signal and output a drive signal to a switch, the switch being configured to affect the primary current flowing through the primary winding;
wherein the voltage-to-current-conversion component is further configured to process information associated with the voltage signal and generate the first current signal based on at least information associated with the voltage signal;
wherein;
the drive signal is associated with at least one or more switching periods, each switching period of the one or more switching periods including at least an on-time period for the switch and a demagnetization period for a demagnetization process; and
the first current signal represents the primary current at the end of the on-time period;
wherein for each switching period of the one or more switching periods,the first current signal discharges or charges the capacitor during only the demagnetization period;
the second current signal charges or discharges the capacitor during the switching period; and
the switching period multiplied by the second current signal is equal to the demagnetization period multiplied by the first current signal in magnitude.
1 Assignment
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Accused Products
Abstract
System and method for regulating a power converter. The system includes a first signal processing component configured to receive at least a sensed signal and generate a first signal. The sensed signal is associated with a primary current flowing through a primary winding coupled to a secondary winding for a power converter. Additionally, the system includes a second signal processing component configured to generate a second signal, an integrator component configured to receive the first signal and the second signal and generate a third signal, and a comparator configured to process information associated with the third signal and the sensed signal and generate a comparison signal based on at least information associated with the third signal and the sensed signal.
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Citations
25 Claims
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1. A system for regulating a power converter, the system comprising:
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a voltage-to-current-conversion component configured to generate a first current signal; a current-signal generator configured to generate a second current signal; a capacitor coupled to the current-signal generator and coupled, through a switch, to the voltage-to-current-conversion component, the capacitor being configured to generate a voltage signal; a comparator configured to process information associated with the voltage signal and a sensed signal and generate a comparison signal based on at least information associated with the voltage signal and the sensed signal, the sensed signal being associated with a primary current flowing through a primary winding coupled to a secondary winding for a power converter; a modulation-signal generator configured to receive at least the comparison signal and generate a modulation signal; and a gate driver configured to receive the modulation signal and output a drive signal to a switch, the switch being configured to affect the primary current flowing through the primary winding; wherein the voltage-to-current-conversion component is further configured to process information associated with the voltage signal and generate the first current signal based on at least information associated with the voltage signal; wherein; the drive signal is associated with at least one or more switching periods, each switching period of the one or more switching periods including at least an on-time period for the switch and a demagnetization period for a demagnetization process; and the first current signal represents the primary current at the end of the on-time period; wherein for each switching period of the one or more switching periods, the first current signal discharges or charges the capacitor during only the demagnetization period; the second current signal charges or discharges the capacitor during the switching period; and the switching period multiplied by the second current signal is equal to the demagnetization period multiplied by the first current signal in magnitude. - View Dependent Claims (2, 3, 4, 5)
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6. A method for regulating a power converter, the method comprising:
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generating a first current signal and a second current signal; processing information associated with the first current signal and the second current signal; generating a voltage signal, by at least a capacitor, based on at least information associated with the first current signal and the second current signal; processing information associated with the voltage signal and a sensed signal, the sensed signal being associated with a primary current flowing through a primary winding coupled to a secondary winding for a power converter; generating a comparison signal based on at least information associated with the voltage signal and the sensed signal; receiving at least the comparison signal; generating a modulation signal based on at least information associated with the comparison signal; receiving the modulation signal; and outputting a drive signal based on at least information associated with the modulation signal to affect the primary current flowing through the primary winding; wherein the process for generating a first current signal and a second current signal includes processing information associated with the voltage signal and generating the first current signal based on at least information associated with the voltage signal; wherein; the drive signal is associated with at least one or more switching periods, each switching period of the one or more switching periods including at least an on-time period and a demagnetization period; and the first current signal represents the primary current at the end of the on-time period; wherein for each switching period of the one or more switching periods, the process for processing information associated with the first current signal and the second current signal includes; discharging or charging the capacitor with the first current signal during only the demagnetization period; and charging or discharging the capacitor with the second current signal during the switching period; wherein the switching period multiplied by the second current signal is equal to the demagnetization period multiplied by the first current signal in magnitude.
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7. A system for regulating a power converter, the system comprising:
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a first sampling-and-holding and voltage-to-current-conversion component configured to receive at least a sensed signal and generate a first current signal, the sensed signal being associated with a primary current flowing through a primary winding coupled to a secondary winding for a power converter; a second sampling-and-holding and voltage-to-current-conversion component configured to receive at least the sensed signal and generate a second current signal; a current-signal generator configured to generate a third current signal; a capacitor coupled to the current-signal generator and coupled, through a switch, to the first sampling-and-holding and voltage-to-current-conversion component and the second sampling-and-holding and voltage-to-current-conversion component, the capacitor being configured to generate a voltage signal; a comparator configured to process information associated with the voltage signal and a ramping signal and generate a comparison signal based on at least information associated with the voltage signal and the ramping signal; a modulation-signal generator configured to receive at least the comparison signal and generate a modulation signal; and a gate driver configured to receive the modulation signal and output a drive signal to a switch, the switch being configured to affect the primary current flowing through the primary winding; wherein; the drive signal is associated with at least a plurality of switching periods, each switching period of the plurality of switching periods including at least an on-time period for the switch and a demagnetization period for a demagnetization process; the first current signal represents the primary current at the beginning of the on-time period; and the second current signal represents the primary current at the end of the on-time period; wherein for each switching period of the plurality of switching periods, the first current signal and the second current signal discharge or charge the capacitor during only the demagnetization period; and the third current signal charges or discharges the capacitor during the switching period; wherein over the plurality of switching periods, accumulatively, the switching period multiplied by the third current signal is equal to the demagnetization period multiplied by a sum of the first current signal and the second current signal in magnitude. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for regulating a power converter, the method comprising:
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receiving at least a sensed signal, the sensed signal being associated with a primary current flowing through a primary winding coupled to a secondary winding for a power converter; processing information associated with the sensed signal; generating a first current signal and a second current signal based on at least information associated with the sensed signal; generating a third current signal; processing information associated with the first current signal, the second current signal and the third current signal; generating a voltage signal, by at least a capacitor, based on at least information associated with the first current signal, the second current signal and the third current signal; processing information associated with the voltage signal and a ramping signal; generating a comparison signal based on at least information associated with the voltage signal and the ramping signal; receiving at least the comparison signal; generating a modulation signal based on at least information associated with the comparison signal; receiving the modulation signal; and outputting a drive signal based on at least information associated with the modulation signal to affect the primary current flowing through the primary winding; wherein; the drive signal is associated with at least a plurality of switching periods, each switching period of the plurality of switching periods including at least an on-time period and a demagnetization period; the first current signal represents the primary current at the beginning of the on-time period; and the second current signal represents the primary current at the end of the on-time period; wherein for each switching period of the plurality of switching periods, the process for processing information associated with the first current signal, the second current signal and the third current signal includes; discharging or charging the capacitor with the first current signal and the second current signal during only the demagnetization period; and charging or discharging the capacitor with the third current signal during the switching period; wherein over the plurality of switching periods, accumulatively, the switching period multiplied by the third current signal is equal to the demagnetization period multiplied by a sum of the first current signal and the second current signal in magnitude.
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19. A system for regulating a power converter, the system comprising:
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a voltage-to-current-conversion component configured to generate a first current signal; a current-signal generator configured to generate a second current signal; a capacitor coupled to the current-signal generator and coupled, through a switch, to the voltage-to-current-conversion component, the capacitor being configured to generate a voltage signal; a multiplier component configured to process information associated with the voltage signal and an input signal and generate a multiplication signal based on at least information associated with the voltage signal and the input signal, the input signal being related to a primary winding; a comparator configured to receive the multiplication signal and a sensed signal and generate a comparison signal based on at least information associated with the multiplication signal and the sensed signal; a modulation-signal generator configured to receive at least the comparison signal and generate a modulation signal; and a gate driver configured to receive the modulation signal and output a drive signal to a switch, the switch being configured to affect a primary current flowing through the primary winding; wherein the voltage-to-current-conversion component is further configured to process information associated with the multiplication signal and generate the first current signal based on at least information associated with the multiplication signal; wherein; the drive signal is associated with at least a plurality of switching periods, each switching period of the plurality of switching periods including at least an on-time period for the switch and a demagnetization period for a demagnetization process; and the first current signal represents the primary current at the end of the on-time period; wherein for each switching period of the plurality of switching periods, the first current signal discharges or charges the capacitor during only the demagnetization period; and the second current signal charges or discharges the capacitor during the switching period; wherein over the plurality of switching periods, accumulatively, the switching period multiplied by the second current signal is equal to the demagnetization period multiplied by the first current signal in magnitude. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for regulating a power converter, the method comprising:
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generating a first current signal and a second current signal; processing information associated with the first current signal and the second current signal; generating a voltage signal, by at least a capacitor, based on at least information associated with the first current signal and the second current signal; processing information associated with the voltage signal and an input signal, the input signal being related to a primary winding; generating a multiplication signal based on at least information associated with the voltage signal and the input signal; receiving the multiplication signal and a sensed signal; generating a comparison signal based on at least information associated with the multiplication signal and the sensed signal; receiving at least the comparison signal; generating a modulation signal based on at least information associated with the comparison signal; receiving the modulation signal; and outputting a drive signal based on at least information associated with the modulation signal to affect a primary current flowing through the primary winding; wherein the process for generating a first current signal and a second current signal includes processing information associated with the multiplication signal and generating the first current signal based on at least information associated with the multiplication signal; wherein; the drive signal is associated with at least a plurality of switching periods, each switching period of the plurality of switching periods including at least an on-time period and a demagnetization period; and the first current signal represents the primary current at the end of the on-time period; wherein for each switching period of the plurality of switching periods, the process for processing information associated with the first current signal and the second current signal includes; discharging or charging the capacitor with the first current signal during only the demagnetization period; and charging or discharging the capacitor with the second current signal during the switching period; wherein over the plurality of switching periods, accumulatively, the switching period multiplied by the second current signal is equal to the demagnetization period multiplied by the first current signal in magnitude.
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Specification