Patent ID: 7522434

Claim:
A power converter module of a switched mode power converter, the power converter module comprising: an interface circuit, the interface circuit comprising a timing circuit configured to isolate a switch instant of a switch of a switched mode power converter, wherein switching of the switch at least partially causes an oscillating signal component within a signal after each switch instant; and a detector circuit configured to detect a first peak voltage and a second peak voltage of the oscillating signal component after the isolated switch instant; a computer-readable medium having computer-readable instructions stored thereon, the instructions configured to cause the power converter module to receive a first value for the detected first peak voltage and a second value for the detected second peak voltage; and estimate a temperature of the power converter module using the received first value and the received second value by solving a quadratic equation for the temperature having the form (B 1 A 2 −B 2 A 1 )T 2 +(E 1 A 2 −A 1 E 2 +B 1 C 2 −C 1 B 2 −v 1 A 2 +v 2 A 1 )T+E 1 C 2 −C 1 E 2 +v 2 C 1 −v 1 C 2 =0; where T is the temperature, v 1 is the first value, v 2 is the second value, and A 1 , A 2 , B 1 , B 2 , C 1 , C 2 , E 1 , and E 2 are best-fit parameters; and a processor, the processor coupled to the computer-readable medium to execute the instructions.