SYSTEMS AND METHODS FOR CURRENT CONTROL OF POWER CONVERSION SYSTEMS
First Claim
1. A system controller for regulating an output current of a power conversion system, the system controller comprising:
- a driving component configured to output a drive signal to a switch in order to affect a primary current flowing through a primary winding of the power conversion system, the drive signal being associated with at least a switching period, the switching period including an on-time period and a demagnetization period;
a demagnetization detector configured to receive a feedback signal associated with an output voltage of the power conversion system and generate a detection signal based on at least information associated with the feedback signal, the detection signal indicating the demagnetization period;
a current-regulation component configured to receive the drive signal, the detection signal and a current-sensing signal and output a current-regulation signal based on at least information associated with the drive signal, the detection signal, and the current sensing signal, the current-sensing signal representing the primary current in magnitude; and
a signal processing component configured to receive the current-regulation signal and output a processed signal to the driving component in order to generate the drive signal.
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Abstract
System and method for regulating an output current of a power conversion system. An example system controller for regulating an output current of a power conversion system includes a driving component, a demagnetization detector, a current-regulation component, and a signal processing component. The driving component is configured to output a drive signal to a switch in order to affect a primary current flowing through a primary winding of the power conversion system. The demagnetization detector is configured to receive a feedback signal associated with an output voltage of the power conversion system and generate a detection signal based on at least information associated with the feedback signal. The current-regulation component is configured to receive the drive signal, the detection signal and a current-sensing signal and output a current-regulation signal based on at least information associated with the drive signal, the detection signal, and the current sensing signal.
134 Citations
41 Claims
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1. A system controller for regulating an output current of a power conversion system, the system controller comprising:
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a driving component configured to output a drive signal to a switch in order to affect a primary current flowing through a primary winding of the power conversion system, the drive signal being associated with at least a switching period, the switching period including an on-time period and a demagnetization period; a demagnetization detector configured to receive a feedback signal associated with an output voltage of the power conversion system and generate a detection signal based on at least information associated with the feedback signal, the detection signal indicating the demagnetization period; a current-regulation component configured to receive the drive signal, the detection signal and a current-sensing signal and output a current-regulation signal based on at least information associated with the drive signal, the detection signal, and the current sensing signal, the current-sensing signal representing the primary current in magnitude; and a signal processing component configured to receive the current-regulation signal and output a processed signal to the driving component in order to generate the drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system controller for regulating an output current of a power conversion system, the system controller comprising:
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a driving component configured to output a drive signal to a switch in order to affect a primary current flowing through a primary winding of the power conversion system, the drive signal being associated with at least a switching period, the switching period including an on-time period and a demagnetization period; a current-regulation controller configured to receive the drive signal, a detection signal and a current-sensing signal and output a first signal based on at least information associated with the drive signal, the detection signal, and the current sensing signal, the detection signal indicating the demagnetization period, the current-sensing signal representing the primary current in magnitude; an amplifier configured to receive the first signal and a reference signal and generate, with at least a capacitor, an amplified signal based on at least information associated with the first signal and the reference signal; and a comparator configured to receive the amplified signal and a ramp signal and generate a comparison signal based on at least information associated with the amplified signal and the ramp signal, the ramp signal being associated with at least a ramping period; wherein the driving component is further configured to; receive the comparison signal and a second signal associated with at least a signal period; process information associated with the comparison signal and the second signal; and generate the drive signal based on at least information associated with the comparison signal and the second signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A system controller for detecting a demagnetization period associated with a power conversion system, the system controller comprising:
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a differentiation component configured to receive a feedback signal associated with an output signal of the power conversion system and output a processed signal based on at least information associated with the feedback signal; a comparator configured to receive at least the processed signal and generate a comparison signal based on at least information associated with the processed signal; and a detection component configured to receive at least the comparison signal and output a detection signal based on at least information associated with the comparison signal; wherein the differentiation component includes; a capacitor including a first capacitor terminal and a second capacitor terminal, the first capacitor terminal being configured to receive the feedback signal; a resistor including a first resistor terminal and a second resistor terminal, the first resistor terminal being configured to output the processed signal, the second resistor terminal being biased to a predetermined voltage; and a current source including a first component terminal and a second component terminal, the first component terminal being coupled to the second capacitor terminal and the first resistor terminal. - View Dependent Claims (37, 38)
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39. A method for regulating an output current of a power conversion system, the method comprising:
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outputting a drive signal to a switch in order to affect a primary current flowing through a primary winding of the power conversion system, the drive signal being associated with at least a switching period, the switching period including an on-time period and a demagnetization period; receiving a feedback signal associated with an output voltage of the power conversion system; processing information associated with the feedback signal; generating a detection signal based on at least information associated with the feedback signal, the detection signal indicating the demagnetization period; receiving the drive signal, the detection signal and a current-sensing signal, the current-sensing signal representing the primary current in magnitude; processing information associated with the drive signal, the detection signal and the current-sensing signal; outputting a current-regulation signal based on at least information associated with the drive signal, the detection signal, and the current sensing signal; receiving the current-regulation signal; processing information associated with the current-regulation signal; and outputting a processed signal to the driving component in order to generate the drive signal.
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40. A method for regulating an output current of a power conversion system, the method comprising:
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outputting a drive signal to a switch in order to affect a primary current flowing through a primary winding of the power conversion system, the drive signal being associated with at least a switching period, the switching period including an on-time period and a demagnetization period; receiving the drive signal, a detection signal and a current-sensing signal, the detection signal indicating the demagnetization period, the current-sensing signal representing the primary current in magnitude; processing information associated with the drive signal, the detection signal and the current-sensing signal; outputting a first signal based on at least information associated with the drive signal, the detection signal, and the current sensing signal; receiving the first signal and a reference signal; processing information associated with the first signal and the reference signal; generating, with at least a capacitor, an amplified signal based on at least information associated with the first signal and the reference signal; receiving the amplified signal and a ramp signal, the ramp signal being associated with at least a ramping period; processing information associated with the amplified signal and the ramp signal; generating a comparison signal based on at least information associated with the amplified signal and the ramp signal; receiving the comparison signal and a second signal associated with at least a signal period; processing information associated with the comparison signal and the second signal; and generating the drive signal based on at least information associated with the comparison signal and the second signal.
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41. A method for detecting a demagnetization period associated with a power conversion system, the method comprising:
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receiving, by at least a capacitor, a feedback signal associated with an output signal of the power conversion system, the capacitor including a first capacitor terminal and a second capacitor terminal, the first capacitor terminal receiving the feedback signal, the second capacitor terminal being coupled to a first component terminal of a current source, the current source further including a second component terminal; providing a current, by the current source, to at least a resistor including a first resistor terminal and a second resistor terminal, the first resistor terminal being coupled to the first component terminal, the second resistor terminal being biased to a predetermined voltage; processing information associated with the feedback signal and the current; outputting, by at least the first resistor terminal, a processed signal based on at least information associated with the feedback signal and the current; receiving at least the processed signal and a reference signal; processing information associated with the processed signal and the reference signal; generating a comparison signal based on at least information associated with the processed signal and the reference signal; receiving at least the comparison signal; and generating a detection signal based on at least information associated with the comparison signal.
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Specification