Digital Overcurrent Protection Device for a Power Supply Device and Related Power Supply Device
OwnerYen-Hui Wang, Chi-Hao Wu +2inventors
InventorsYen-Hui Wang, Chi-Hao Wu, Chia-Chieh Hung, Yu-Min Shih
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Abstract
A digital overcurrent protection device for a power supply device includes a receiving end for receiving a current sensing signal, a digital reference voltage generator for digitally generating a reference voltage, a comparator coupled between the receiving end and the digital reference voltage generator for comparing the current sense signal with the reference voltage in order to generate a comparison result, and a control unit coupled to the comparator for controlling a power switch of the power supply device according to the comparison result.
Claims18
A digital overcurrent protection device for a power supply device, the digital overcurrent protection device comprising:
- a receiving end for receiving a current sensing signal;
- a digital reference voltage generator for digitally generating a reference voltage;
- a comparator coupled between the receiving end and the digital reference voltage generator for comparing the current sensing signal with the reference voltage in order to generate a comparison result;
- and
- a control unit coupled to the comparator for controlling an on/off status of a power switch of the power supply device according to the comparison result.
A power supply device with overcurrent protection, the power supply device comprising:
- an input stage for filtering and rectifying an input signal in order to generate a first power signal;
- a transformer having a primary side circuit coupled to the input stage and a secondary side circuit, for transforming the first power signal into a second power signal;
- a power switch coupled to the primary side circuit;
- a current sensing unit coupled to the power switch for detecting currents passing through the primary side circuit of the power switch in order to generate a current sensing signal;
- an output stage coupled to the transformer for outputting the second power signal to a load;
- and
- a digital overcurrent protection device coupled to the current sensing unit and the power switch, the digital overcurrent protection device comprising:
- a receiving end for receiving the current sensing signal;
- a digital reference voltage generator for digitally generating a reference voltage;
- a comparator coupled between the receiving end and the digital reference voltage generator for comparing the current sensing signal with the reference voltage in order to generate a comparison result;
- and
- a control unit coupled to the comparator and the power switch for controlling an on/off status of the power switch according to the comparison result.
Dependencies are inferred from the claim text.