Control circuit of power converter with temperature control and method for controlling power converter
View Patent ↗A control circuit of a power converter and a method for controlling the power converter are provided. The control circuit of the power converter comprises a switching circuit and a temperature-sensing device. The switching circuit generates a switching signal in response to a feedback signal, and the switching circuit generates a current-sensing signal for regulating an output of the power converter. The temperature-sensing device generates a temperature signal in response to temperature of the temperature-sensing device.
1. A control circuit of a power converter, comprising:
a switching circuit generating a switching signal in response to a feedback signal, and generating a current-sensing signal for regulating an output of the power converter; and
a temperature-sensing device generating a temperature signal in response to temperature of the temperature sense device,
wherein the temperature signal is configured for linearly modulating the switching signal when a value of the temperature signal is higher than a limit value of temperature,
in which the temperature signal is configured for turning off the switching signal after a delay time when the value of the temperature signal of the temperature-sensing device is higher than a high limit value of temperature.
2. The control circuit as claimed in claim 1 , in which an output current of the power converter linearly decreases in response to a temperature increase of the temperature-sensing device when the temperature of the temperature-sensing device is higher than the limit value of temperature.
3. The control circuit as claimed in claim 1 , in which an output power of the power converter linearly decreases in response to a temperature increase of the temperature-sensing device when the temperature of the temperature-sensing device is higher than the limit value of temperature.
4. The control circuit as claimed in claim 1 , in which the control circuit is configured for regulating an output power from a primary side of the power converter.
5. The control circuit as claimed in claim 1 , in which the temperature signal is configured for generating a current signal for modulating the switching signal and the current-sensing signal.
6. A method for controlling a power converter, comprising:
generating a switching signal in response to a feedback signal, and generating a current-sensing signal for regulating an output of the power converter;
generating a temperature signal in response to temperature of a temperature-sensing device; and
when the value of the temperature signal is higher than a limit value of temperature, linearly modulating the switching signal according to the temperature signal,
in which the temperature signal is configured for turning off the switching signal after a delay time when the temperature of the temperature-sensing device is higher than a high limit value of temperature.
7. The method as claimed in claim 6 , in which an output current of the power converter linearly decreases in response to a temperature increase of the temperature-sensing device when the temperature of the temperature-sensing device is higher than the limit value of temperature.
8. The method as claimed in claim 6 , in which an output power of the power converter linearly decreases in response to a temperature increase of the temperature-sensing device when the temperature of the temperature-sensing device is higher than the limit value of temperature.
9. The method as claimed in claim 6 , in which the power converter is regulated from a primary side of the power converter.
10. The method as claimed in claim 6 , in which the temperature signal is configured for generating a current signal for modulating the switching signal and the current-sensing signal.