Signal conditioning circuit
OwnerKetao Li, Yufan Wang +1inventors
InventorsKetao Li, Yufan Wang, Liang Wang
Life of this patent
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Abstract
A signal conditioning circuit for monitoring at least one parameter of an electrical signal in an electrical conductor. The signal conditioning circuit can include an integrator circuit having an input for receiving a signal from a current sensor coupled to the electrical conductor. A first analog switch has an input coupled to the output of the integrator circuit, wherein the first analog switch is controlled by the output of a time delay circuit. A power stage circuit has an input coupled to the output of the first analog switch. The signal conditioning circuit can be used for line fault detection.
Claims20
A signal conditioning circuit for monitoring at least one parameter of an electrical signal in an electrical conductor, comprising:
- an integrator circuit having an input for receiving a signal from a current sensor coupled to the electrical conductor;
- a first analog switch having an input coupled to the output of the integrator circuit, wherein the first analog switch is controlled by the output of a time delay circuit;
- and
- a power stage circuit having an input coupled to the output of the first analog switch.
A protective relay system, comprising:
- a current sensor located proximate a current conductor for detecting current in the conductor;
- and
- a signal conditioning circuit coupled to the current sensor, comprising:
- an integrator circuit;
- a time-controlled switch having an input coupled to the output of the integrator circuit;
- a power stage circuit having an input coupled to the output of the time-controlled switch;
- a protective relay device coupled to the signal conditioning circuit;
- and
- a circuit breaker coupled to the protective relay device.
Dependencies are inferred from the claim text.