Systems and methods for over-temperature protection and over-voltage protection for power conversion systems
First Claim
1. A system controller for protecting a power converter, the system controller comprising:
- a first controller terminal configured to receive a first input signal during a first switching period, receive a second input signal during a second switching period, and receive a third input signal during a third switching period;
wherein;
the first switching period precedes the second switching period; and
the second switching period precedes the third switching period;
wherein the system controller is configured to;
in response to a temperature associated with a power converter being larger than a predetermined temperature threshold, generate a drive signal for a switch to open and remain open to protect the power converter;
wherein the system controller is further configured to;
in response to an output voltage associated with a secondary winding of the power converter being larger than a predetermined voltage threshold, generate the drive signal for the switch to open and remain open to protect the power converter;
wherein the first controller terminal is further configured to;
receive the first input signal during only a first part of the first switching period;
receive the second input signal during only a second part of the second switching period; and
receive the third input signal during only a third part of the third switching period;
wherein;
the first part is smaller in magnitude than the first switching period, the first part starting at a first start time of the first switching period and ending before a first end time of the first switching period;
the second part is smaller in magnitude than the second switching period, the second part starting at a second start time of the second switching period and ending before a second end time of the second switching period; and
the third part is smaller in magnitude than the third switching period, the third part starting at a third start time of the third switching period and ending before a third end time of the third switching period.
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Accused Products
Abstract
Systems and methods are provided for protecting a power conversion system. A system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to provide a drive signal to close and open a switch to affect a first current flowing through a primary winding of a power conversion system. The second controller terminal is configured to receive first input signals during one or more first switching periods and receive second input signals during one or more second switching periods. The system controller is configured to determine whether a temperature associated with the power conversion system is larger than a predetermined temperature threshold, and in response to the temperature associated with the power conversion system being larger than the predetermined temperature threshold, generate the drive signal to cause the switch open and remain open to protect the power conversion system.
48 Citations
25 Claims
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1. A system controller for protecting a power converter, the system controller comprising:
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a first controller terminal configured to receive a first input signal during a first switching period, receive a second input signal during a second switching period, and receive a third input signal during a third switching period; wherein; the first switching period precedes the second switching period; and the second switching period precedes the third switching period; wherein the system controller is configured to; in response to a temperature associated with a power converter being larger than a predetermined temperature threshold, generate a drive signal for a switch to open and remain open to protect the power converter; wherein the system controller is further configured to; in response to an output voltage associated with a secondary winding of the power converter being larger than a predetermined voltage threshold, generate the drive signal for the switch to open and remain open to protect the power converter; wherein the first controller terminal is further configured to; receive the first input signal during only a first part of the first switching period; receive the second input signal during only a second part of the second switching period; and receive the third input signal during only a third part of the third switching period; wherein; the first part is smaller in magnitude than the first switching period, the first part starting at a first start time of the first switching period and ending before a first end time of the first switching period; the second part is smaller in magnitude than the second switching period, the second part starting at a second start time of the second switching period and ending before a second end time of the second switching period; and the third part is smaller in magnitude than the third switching period, the third part starting at a third start time of the third switching period and ending before a third end time of the third switching period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system controller for protecting a power converter, the system controller comprising:
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a protection signal generator configured to receive a first voltage signal associated with a first input current flowing through a resistor during a first switching period and receive a second voltage signal associated with a second input current flowing through the resistor during a second switching period; wherein the protection signal generator is further configured to, in response to the first voltage signal minus the second voltage signal being smaller than a predetermined threshold in magnitude, generate a protection signal for a switch of a power converter to open and remain open; wherein the first switching period precedes the second switching period; wherein; the first input current is not equal to zero in magnitude; and the second input current is not equal to zero in magnitude; wherein the first voltage signal minus the second voltage signal is proportional to the first input current minus the second input current. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system controller for protecting a power converter, the system controller comprising:
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a first resistor configured to generate a first voltage based at least in part on a first current and a second current; a second resistor configured to generate a second voltage based at least in part on a third current; a first detector configured to, in response to the first voltage becoming larger than a first voltage threshold in magnitude, increase the second voltage in magnitude, discharge a capacitor coupled to the first detector, and decrease a third voltage in magnitude associated with the capacitor; a controller terminal configured to provide a drive signal for a switch of a power converter; and a second detector configured to detect the third voltage, and in response to the third voltage being smaller in magnitude than a second voltage threshold, output a protection signal for the switch to open and remain open to protect the power converter. - View Dependent Claims (20, 21, 22)
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23. A method for protecting a power converter, the method comprising:
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receiving a first input signal during a first switching period, receiving a second input signal during a second switching period, and receiving a third input signal during a third switching period; in response to a temperature associated with a power converter being larger than a predetermined temperature threshold, generating a drive signal for a switch to open and remain open to protect the power converter; and in response to an output voltage associated with a secondary winding of the power converter being larger than a predetermined voltage threshold, generating the drive signal for the switch to open and remain open to protect the power converter; wherein; the first switching period precedes the second switching period; and the second switching period precedes the third switching period; wherein; the receiving a first input signal during the first switching period includes receiving the first input signal during only a first part of the first switching period; the receiving a second input signal during the second switching period includes receiving the second input signal during only a second part of the second switching period; and the receiving a third input signal during the third switching period includes receiving the third input signal during only a third part of the third switching period; wherein; the first part is smaller in magnitude than the first switching period, the first part starting at a first start time of the first switching period and ending before a first end time of the first switching period; the second part is smaller in magnitude than the second switching period, the second part starting at a second start time of the second switching period and ending before a second end time of the second switching period; and the third part is smaller in magnitude than the third switching period, the third part starting at a third start time of the third switching period and ending before a third end time of the third switching period.
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24. A method for protecting a power converter, the method comprising:
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receiving a first voltage signal associated with a first input current flowing through a resistor during a first switching period; receiving a second voltage signal associated with a second input current flowing through the resistor during a second switching period; and in response to the first voltage signal minus the second voltage signal being smaller than a predetermined threshold in magnitude, generating a protection signal for a switch to open and remain open; wherein the first switching period precedes the second switching period; wherein; the first input current is not equal to zero in magnitude; and the second input current is not equal to zero in magnitude; wherein the first voltage signal minus the second voltage signal is proportional to the first input current minus the second input current.
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25. A method for protecting a power converter, the method comprising:
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generating at a first resistor a first voltage based at least in part on a first current and a second current; generating at a second resistor a second voltage based at least in part on a third current; in response to the first voltage becoming larger than a first voltage threshold in magnitude, increasing the second voltage in magnitude; discharging a capacitor, and decreasing a third voltage in magnitude associated with the capacitor; providing a drive signal for a switch of a power converter; detecting the third voltage; and in response to the third voltage being smaller in magnitude than a second voltage threshold, outputting a protection signal for the switch to open and remain open to protect the power converter.
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Specification