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US 7,402,959 B2Granted
Phase sampling protection device
AssigneeLogan Technology Corp.
InventorsWei-Chang Chen, Yi-Chao Chiang
Life of this patent
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Abstract
A phase sampling protection device substantially includes a phase sampling circuit coupled between a tube circuit and a protection circuit. The phase sampling circuit captures a voltage signal and a current phase signal of the tube circuit for comparison, using phase comparing technique to detect an anomaly of the tube, if the tube doesn't function normally, then the phase sampling circuit driving the protection circuit to shut down the power supply of the tube to keep a transformer from burning down and other safety issues from happening.
Claims9
A phase sampling protection device comprising:
- a tube circuit including a transformer, a resistor, a capacitor and a tube;
- a protection circuit for shutting down a power supply of the tube circuit;
- and
- a phase sampling circuit having an input for capturing a voltage phase signal and a current phase signal of the tube circuit and an output coupled with the protection circuit, the phase sampling circuit comparing the voltage phase signal and the current phase signal of the tube circuit to accurately determine whether the tube functions normally, if the tube doesn't function normally, then the phase sampling circuit driving the protection circuit to shut down the power supply of the tube to keep the transformer from burning down.
1 more element
Dependencies are inferred from the claim text.