Power supply apparatus with limited power source capability and method of controlling the same
AssigneeDelta Electronics, Inc.
InventorsCheng-Yi LIN, Yu-Lun HUANG
Life of this patent
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Abstract
A power supply apparatus with limited power source capability includes a power path, a current sensing resistor, a control unit, and a switch. The power path is coupled between a transformer and an output port of the power supply apparatus. The current sensing resistor is disposed on the power path. The control unit is coupled to the current sensing resistor. The switch is disposed on the power path. When the control unit determines that a sense voltage of the current sensing resistor is less than a first threshold value and a signal voltage of the control unit is greater than a second threshold value, the control unit turns off the switch.
Claims15
A power supply apparatus with limited power source capability, comprising:
- a power path coupled between a transformer and an output port of the power supply apparatus,
- a current sensing resistor disposed on the power path,
- a control unit coupled to the current sensing resistor, and
- a switch disposed on the power path,
- wherein when the control unit determines that a sense voltage of the current sensing resistor is less than a first threshold value and a signal voltage of the control unit is greater than a second threshold value, the control unit turns off the switch.
A method of controlling a power supply apparatus with limited power source capability, the method comprising steps of:
- comparing a sense voltage of a current sensing resistor of the power supply apparatus with a first threshold value, the current sensing resistor disposed on a power path of the power supply apparatus,
- comparing a signal voltage provided by a synchronous rectifying circuit of the power supply apparatus with a second threshold value, and
- turning off a switch disposed on the power path when the sense voltage is less than the first threshold value and the signal voltage is greater than the second threshold value.
Dependencies are inferred from the claim text.