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US 12,416,651 B2Granted
Absence of voltage detector
AssigneePanduit Corp.
InventorMasud Bolouri-Saransar
Life of this patent
Estimating the term…
Abstract
An absence of voltage indicator has an isolation circuit, an FM modulator attached to the isolation circuit, a reference oscillator, and a mixer attached to the reference oscillator and the FM modulator, wherein the output of the mixer is the difference of the two signals. In one embodiment, the FM modulator includes a variable capacitor which varies in response to a voltage in parallel to a fixed capacitor and an inductor in parallel to the capacitors.
Claims1
An isolation system for voltage detection circuitry comprising:
- a first circuit having a first high value resistance in series with a TVS diode in series with a second high value resistor
- a second circuit in parallel with the TVS diode having a third high value resistance in series with a varactor In series with a fourth high value resistance;
- a third circuit in parallel with the varactor having a first high value capacitance in series with the voltage detection circuitry in series with a second high value capacitance, and
- circuitry connected to the system capable of measuring a decay time and determining a state of connection based upon the decay time.
1 more element
Dependencies are inferred from the claim text.