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;
wherein the demagnetization detector is further configured to;
if the power conversion system operates in the demagnetization period, generate the detection signal at a first logic level; and
if the power conversion system does not operate in the demagnetization period, generate the detection signal at a second logic level, the first logic level being different from the second logic level.
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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.
111 Citations
53 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; wherein the demagnetization detector is further configured to; if the power conversion system operates in the demagnetization period, generate the detection signal at a first logic level; and if the power conversion system does not operate in the demagnetization period, generate the detection signal at a second logic level, the first logic level being different from the second logic level. - View Dependent Claims (2)
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3. A system controller for a power converter, the system controller comprising:
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a drive signal generator configured to output a drive signal to a switch in order to affect a current flowing through a primary winding of a power converter, the drive signal being related to a switching period, the switching period including an on-time period and an off-time period, the off-time period including a demagnetization period; and a detection signal generator configured to receive a feedback signal being related to an output voltage of the power converter and generate a detection signal based at least in part on the feedback signal, the switch being closed during the on-time period, the switch being open during the demagnetization period, the detection signal being different from the drive signal; and a regulation signal generator configured to; receive the drive signal; receive the detection signal, the detection signal indicating the demagnetization period and being different from the drive signal; receive an input signal, the input signal representing the current flowing through the primary winding in magnitude; and output a regulation signal based at least in part on the drive signal, the detection signal, and the input signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A system controller for a power converter, the system controller comprising:
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a drive signal generator configured to output a drive signal to a switch in order to affect a current flowing through a primary winding of the power converter, the drive signal being related to a switching period, the switching period including an on-time period and a demagnetization period; an amplifier configured to receive a first signal and a reference signal and generate, with a capacitor, an amplified signal based at least in part on the first signal and the reference signal, the first signal being related to the drive signal, a detection signal, and an input signal, the detection signal indicating the demagnetization period, the input signal representing the current in magnitude; and a comparator configured to receive the amplified signal and a ramp signal and generate a comparison signal based at least in part on the amplified signal and the ramp signal, the amplified signal being related to the first signal, the ramp signal being related to a ramping period; wherein the drive signal generator is further configured to; receive the comparison signal and a second signal being related to a signal period; process the comparison signal and the second signal; and generate the drive signal based at least in part on the comparison signal and the second signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A system controller for a power converter, the system controller comprising:
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a processed signal generator configured to receive a feedback signal being related to an output signal of a power converter and output a processed signal based at least in part on the feedback signal; and a detection signal generator configured to receive a comparison signal and output a detection signal based at least in part on the comparison signal, the comparison signal being related to the processed signal; wherein the processed signal generator 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 generator including a first generator terminal and a second generator terminal, the first generator terminal being coupled to the second capacitor terminal and the first resistor terminal. - View Dependent Claims (47, 48)
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49. A method for a power converter, the method comprising:
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outputting a drive signal in order to affect a current flowing through a primary winding of a power converter, the drive signal being related to a switching period, the switching period including an on-time period and a demagnetization period; receiving a feedback signal being related to an output voltage of the power converter; processing the feedback signal; generating a detection signal based at least in part on the feedback signal, the detection signal indicating the demagnetization period; receiving the drive signal, the detection signal and an input signal, the input signal representing the current in magnitude; processing the drive signal, the detection signal and the input signal; and outputting a regulation signal based at least in part on the drive signal, the detection signal, and the input signal. - View Dependent Claims (50, 51)
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52. A method for a power converter, the method comprising:
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outputting a drive signal in order to affect a current flowing through a primary winding of a power converter, the drive signal being related to a switching period, the switching period including an on-time period and a demagnetization period; receiving the drive signal, a detection signal and an input signal, the detection signal indicating the demagnetization period, the input signal representing the current in magnitude; processing the drive signal, the detection signal and the input signal; outputting a first signal based at least in part on the drive signal, the detection signal, and the input signal; receiving an amplified signal and a ramp signal, the amplified signal being related to the first signal, the ramp signal being related to a ramping period; processing the amplified signal and the ramp signal; generating a comparison signal based at least in part on the amplified signal and the ramp signal; receiving the comparison signal and a second signal being related to a signal period; processing the comparison signal and the second signal; and generating the drive signal based at least in part on the comparison signal and the second signal.
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53. A method for detecting a demagnetization period related to a power converter, the method comprising:
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receiving, by a capacitor, a feedback signal being related to an output signal of a power converter, 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 generator terminal of a current generator, the current generator further including a second generator terminal; generating a current, by the current generator, to flow through a resistor including a first resistor terminal and a second resistor terminal, the first resistor terminal being coupled to the first generator terminal, the second resistor terminal being biased to a predetermined voltage; processing the feedback signal and the current; outputting a processed signal based at least in part on the feedback signal and the current; receiving a comparison signal, the comparison signal being related to the processed signal; and generating a detection signal based at least in part on the comparison signal.
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Specification