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US 2017/0317593 A1Published application
Controller and power supply
AssigneeLeadtrend Technology Corp.
InventorsKuo-Chien Huang, Ren-Yi Chen
Life of this patent
Estimating the term…
Abstract
Power supplies together with related over voltage protection methods and apparatuses. A power supply has a transformer including a primary winding and an auxiliary winding. A power switch is coupled to the primary winding and a sensing resistor coupled between the power switch and a grounding line. A multi-function terminal of a controller is coupled to the sensing resistor. A diode and a first resistor is coupled between the auxiliary winding and the multi-function terminal.
Claims7
A power supply, comprising:
- a transformer, having a primary winding and an auxiliary winding;
- a power switch coupled to the primary winding;
- a sensing resistor, having a first terminal coupled to a grounding line and a second terminal coupled to the power switch;
- a controller, having a multi-function terminal coupled to the sensing resistor;
- and
- a diode and a first resistor, coupled between the auxiliary winding and the multi-function terminal;
- wherein, when the power switch is turned on, the controller through the multi-function terminal detects a current through the power switch, and when the power switch is turned off, the controller detects a voltage of the multi-function terminal, and determines to trigger a protection mechanism if the voltage of the multi-function terminal is over a reference voltage.
4 more elements
A controller for controlling a power switch of a power supply, the controller comprising:
- a multi-function terminal, coupled to the power switch, used for detecting a current through the power switch;
- a protection detecting circuit, used for detecting and comparing a voltage of the multi-function terminal with a reference voltage when the power switch is turned off, and triggering a protection signal if the voltage of the multi-function terminal is over a reference voltage;
- and
- a gate controller, coupled to the power switch, used to turning on and turning off the power switch;
- wherein, if the protection mechanism is triggered, the power switch will be turned off.
2 more elements
Dependencies are inferred from the claim text.