Systems and methods for output current regulation in power conversion systems
First Claim
1. A system controller for regulating a power conversion system, the system controller comprising:
- a first transistor including a first transistor terminal, a second transistor terminal, and a third transistor terminal, the first transistor terminal being coupled to a fourth transistor terminal of a second transistor, the second transistor further including a fifth transistor terminal and a sixth transistor terminal;
a first controller terminal coupled to the second resistor terminal and the second diode terminal; and
a second diode including a third diode terminal and a fourth diode terminal, the third diode terminal being coupled to the first controller terminal, the fourth diode terminal being coupled to the first transistor terminal;
wherein;
the fifth transistor terminal is coupled directly to a first resistor terminal of a first resistor, the first resistor further including a second resistor terminal;
the fifth transistor terminal is coupled directly to a first diode terminal of a first diode, the first diode further including a second diode terminal;
the second diode terminal is coupled to the second resistor terminal;
wherein the system controller is configured to change a first voltage of the fourth transistor terminal to turn on and off the second transistor and to affect a current flowing through an inductor.
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Accused Products
Abstract
Systems and methods are provided for regulating a power conversion system. An example system controller includes: a detection component configured to receive an input voltage related to a diode connected to an inductor and output a first signal at a first logic level in response to the input voltage being larger than a predetermined threshold, a control logic component configured to receive the first signal, process information associated with the first signal, and output a modulation signal related to a modulation frequency in response to the first signal being at the first logic level, and a driving component configured to receive the modulation signal and output a drive signal to open and close a first switch at the modulation frequency.
100 Citations
20 Claims
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1. A system controller for regulating a power conversion system, the system controller comprising:
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a first transistor including a first transistor terminal, a second transistor terminal, and a third transistor terminal, the first transistor terminal being coupled to a fourth transistor terminal of a second transistor, the second transistor further including a fifth transistor terminal and a sixth transistor terminal; a first controller terminal coupled to the second resistor terminal and the second diode terminal; and a second diode including a third diode terminal and a fourth diode terminal, the third diode terminal being coupled to the first controller terminal, the fourth diode terminal being coupled to the first transistor terminal; wherein; the fifth transistor terminal is coupled directly to a first resistor terminal of a first resistor, the first resistor further including a second resistor terminal; the fifth transistor terminal is coupled directly to a first diode terminal of a first diode, the first diode further including a second diode terminal; the second diode terminal is coupled to the second resistor terminal; wherein the system controller is configured to change a first voltage of the fourth transistor terminal to turn on and off the second transistor and to affect a current flowing through an inductor. - View Dependent Claims (2, 3, 4, 5)
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6. A system controller for regulating a power conversion system, the system controller comprising:
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a detection component configured to detect one or more peak magnitudes of a current sensing signal associated with a first current from an inductor flowing through a switch and generate an output signal based on at least information associated with the detected one or more peak magnitudes of the current sensing signal; an error amplifier configured to receive the output signal and a reference signal and generate an amplified signal based on at least information associated with the output signal and the reference signal; a comparator configured to receive the current sensing signal and a first signal associated with the amplified signal and output a comparison signal based on at least information associated with the first signal and the current sensing signal; and a control-and-drive component configured to receive the comparison signal and output a drive signal based on at least information associated with the comparison signal to close or open the switch to affect the first current. - View Dependent Claims (7, 8, 9, 10)
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11. A system controller for regulating a power conversion system, the system controller comprising:
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a protection component configured to receive a first signal and a second signal and generate a third signal based on at least information associated with the first signal and the second signal, the first signal being associated with a demagnetization period related to an inductor, the second signal being associated with a first current flowing through the inductor; and a control-and-drive component configured to receive the third signal and output a drive signal to the switch to affect the first current; wherein; the protection component is further configured to, if the second signal indicates, during a first switching cycle associated with the drive signal, that the first current is equal to or larger than a current threshold, and if the first signal indicates, during an off-time period of the first switching cycle, that the demagnetization period is smaller than a predetermined time period, change the third signal from a first signal state to a second signal state to cause the power conversion system to be shut down. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A system controller for regulating a power conversion system, the system controller comprising:
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a protection component configured to receive a first signal and a second signal and generate a third signal based on at least information associated with the first signal and the second signal, the first signal being associated with a demagnetization period related to an inductor, the second signal being associated with a first current flowing through the inductor; and a control-and-drive component configured to receive the third signal and output a drive signal to the switch to affect the first current; wherein; the protection component is further configured to, in response to, the second signal indicating, during a first switching cycle associated with the drive signal, that the first current is equal to or larger than a current threshold, and the first signal indicating, during an off-time period of the first switching cycle, that the demagnetization period is smaller than a predetermined time period, change the third signal from a first signal state to a second signal state to cause the power conversion system to be shut down; wherein the protection component is further configured to, in response to the third signal being changed from the first signal state to the second signal state, keep the third signal at the second signal state regardless of the first signal and the second signal.
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18. A system controller for regulating a power conversion system, the system controller comprising:
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a protection component configured to receive a first signal and a second signal and generate a third signal based on at least information associated with the first signal and the second signal, the first signal being associated with a demagnetization period related to an inductor, the second signal being associated with a first current flowing through the inductor; a control-and-drive component configured to receive the third signal and output a drive signal to the switch to affect the first current; and a comparison component configured to receive a detection signal associated with the demagnetization period, process information associated with the detection signal and the predetermined time period, and generate the first signal based on at least information associated with the detection signal; wherein; the protection component is further configured to, in response to, the second signal indicating, during a first switching cycle associated with the drive signal, that the first current is equal to or larger than a current threshold, and the first signal indicating, during an off-time period of the first switching cycle, that the demagnetization period is smaller than a predetermined time period, change the third signal from a first signal state to a second signal state to cause the power conversion system to be shut down.
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19. A method for regulating a power conversion system, the method comprising:
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sampling one or more peak magnitudes of a current sensing signal associated with a first current from an inductor flowing through a switch; generating an output signal based on at least information associated with the detected one or more peak magnitudes of the current sensing signal; receiving the output signal and a reference signal; processing information associated with the output signal and the reference signal; generating an amplified signal based on at least information associated with the output signal and the reference signal; receiving the current sensing signal and a first signal associated with the amplified signal; processing information associated with the current sensing signal and the first signal; outputting a comparison signal based on at least information associated with the first signal and the current sensing signal; receiving the comparison signal; processing information associated with the comparison signal; and outputting a drive signal based on at least information associated with the comparison signal to close or open the switch to affect the first current.
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20. A method for regulating a power conversion system, the method comprising:
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receiving a first signal and a second signal; processing information associated with the first signal and the second signal; generating a third signal based on at least information associated with the first signal and the second signal, the first signal being associated with a demagnetization period related to an inductor, the second signal being associated with a first current flowing through the inductor; receiving the third signal; processing information associated with the third signal; outputting a drive signal to the switch to affect the first current; and if the second signal indicates, during a first switching cycle associated with the drive signal, that the first current is equal to or larger than a current threshold and the first signal indicates, during an off-time period of the first switching cycle, that the demagnetization period is smaller than a predetermined time period, changing the third signal from a first signal state to a second signal state to cause the power conversion system to be shut down.
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Specification