Systems and methods for protecting power conversion systems from thermal runaway
First Claim
1. A system controller for protecting a power conversion system, the system controller comprising:
- a protection component configured to receive a feedback signal, a reference signal, and a demagnetization signal generated based at least in part on the feedback signal and to generate a protection signal based at least in part on the feedback signal, the reference signal, and the demagnetization signal, the demagnetization signal being related to multiple demagnetization periods of the power conversion system, the multiple demagnetization periods including a first demagnetization period and a second demagnetization period;
wherein the protection component is further configured to;
process the feedback signal and the reference signal during a first detection period, the first detection period including a first starting time and a first ending time, the first starting time being at or after a first demagnetization end of the first demagnetization period;
determine, during the first detection period, a first number of times that the feedback signal changes from being smaller than the reference signal to being larger than the reference signal in magnitude; and
determine whether the first number of times exceeds a predetermined threshold at the first ending time;
wherein the system controller is configured to, in response to the first number of times not exceeding the predetermined threshold at the first ending time, output a drive signal to cause a switch to open and remain open in order to protect the power conversion system, the switch being configured to affect a current flowing through a primary winding of the power conversion system.
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Accused Products
Abstract
System and method for protecting a power conversion system. An example system controller includes a protection component and a driving component. The protection component is configured to receive a feedback signal, a reference signal, and a demagnetization signal generated based on at least information associated with the feedback signal, process information associated with the feedback signal, the reference signal, and the demagnetization signal, and generate a protection signal based on at least information associated with the feedback signal, the reference signal, and the demagnetization signal. The demagnetization signal is related to multiple demagnetization periods of the power conversion system, the multiple demagnetization periods including a first demagnetization period and a second demagnetization period. The driving component is configured to receive the protection signal and output a drive signal to a switch configured to affect a current flowing through a primary winding of the power conversion system.
147 Citations
45 Claims
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1. A system controller for protecting a power conversion system, the system controller comprising:
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a protection component configured to receive a feedback signal, a reference signal, and a demagnetization signal generated based at least in part on the feedback signal and to generate a protection signal based at least in part on the feedback signal, the reference signal, and the demagnetization signal, the demagnetization signal being related to multiple demagnetization periods of the power conversion system, the multiple demagnetization periods including a first demagnetization period and a second demagnetization period; wherein the protection component is further configured to; process the feedback signal and the reference signal during a first detection period, the first detection period including a first starting time and a first ending time, the first starting time being at or after a first demagnetization end of the first demagnetization period; determine, during the first detection period, a first number of times that the feedback signal changes from being smaller than the reference signal to being larger than the reference signal in magnitude; and determine whether the first number of times exceeds a predetermined threshold at the first ending time; wherein the system controller is configured to, in response to the first number of times not exceeding the predetermined threshold at the first ending time, output a drive signal to cause a switch to open and remain open in order to protect the power conversion system, the switch being configured to affect a current flowing through a primary winding of the power conversion system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system controller for protecting a power conversion system, the system controller comprising:
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a protection component configured to receive a feedback signal, a reference signal, and a demagnetization signal generated based at least in part on the feedback signal and to generate a protection signal based at least in part on the feedback signal, the reference signal, and the demagnetization signal, the demagnetization signal being related to multiple demagnetization periods of the power conversion system, the multiple demagnetization periods including a first demagnetization period and a second demagnetization period; wherein the protection component is further configured to; process the feedback signal and the reference signal during a first detection period, the first detection period including a first starting time and a first ending time, the first starting time being at or after a first demagnetization end of the first demagnetization period; determine, during the first detection period, a first number of times that the feedback signal changes from being larger than the reference signal to being smaller than the reference signal in magnitude; and determine whether the first number of times exceeds a predetermined threshold at the first ending time; wherein the system controller is configured to, in response to the first number of times not exceeding the predetermined threshold at the first ending time, output a drive signal to cause a switch to open and remain open in order to protect the power conversion system, the switch being configured to affect a current flowing through a primary winding of the power conversion system. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for protecting a power conversion system, the method comprising:
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receiving a feedback signal, a reference signal, and a demagnetization signal generated based at least in part on the feedback signal; processing the feedback signal, the reference signal, and the demagnetization signal; generating a protection signal based at least in part on the feedback signal, the reference signal, and the demagnetization signal, the demagnetization signal being related to multiple demagnetization periods of the power conversion system, the multiple demagnetization periods including a first demagnetization period and a second demagnetization period; and outputting a drive signal; wherein the processing the feedback signal, the reference signal, and the demagnetization signal includes; processing the feedback signal and the reference signal during a detection period, the detection period including a starting time and an ending time, the starting time being at or after a demagnetization end of the first demagnetization period; determining, during the detection period, a number of times that the feedback signal changes from being smaller than the reference signal to being larger than the reference signal in magnitude; and determining whether the number of times exceeds a predetermined threshold at the ending time; wherein the outputting a drive signal includes; in response to the number of times not exceeding the predetermined threshold at the ending time, outputting the drive signal to cause a switch to open and remain open in order to protect the power conversion system. - View Dependent Claims (39, 40, 41)
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42. A method for protecting a power conversion system, the method comprising:
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receiving a feedback signal, a reference signal, and a demagnetization signal generated based at least in part on the feedback signal; processing the feedback signal, the reference signal, and the demagnetization signal; generating a protection signal based at least in part on the feedback signal, the reference signal, and the demagnetization signal, the demagnetization signal being related to multiple demagnetization periods of the power conversion system, the multiple demagnetization periods including a first demagnetization period and a second demagnetization period; and outputting a drive signal; wherein the processing the feedback signal, the reference signal, and the demagnetization signal includes; processing the feedback signal and the reference signal during a detection period, the detection period including a starting time and an ending time, the starting time being at or after a demagnetization end of the first demagnetization period; determining, during the detection period, a number of times that the feedback signal changes from being larger than the reference signal to being smaller than the reference signal in magnitude; and determining whether the number of times exceeds a predetermined threshold at the ending time; wherein the outputting a drive signal includes; in response to the number of times not exceeding the predetermined threshold at the ending time, outputting the drive signal to cause a switch to open and remain open in order to protect the power conversion system. - View Dependent Claims (43, 44, 45)
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Specification