Patent ID: 11906380
Assignee: SUMITOMO (SHI) CRYOGENICS OF AMERICA, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A bridge voltage inversion circuit for a pressure gauge, comprising:
a transformer including a primary winding and a secondary winding that outputs a bridge voltage;
a reference capacitor connected to a first side of the secondary winding of the transformer, wherein the reference capacitor has a fixed constant capacitance; and
a sensor capacitor connected to a second side of the secondary winding of the transformer, wherein the sensor capacitor senses and responds to a pressure, a capacitance of the sensor capacitor is at a minimum when the pressure is at vacuum, and the constant capacitance of the reference capacitor is greater than the capacitance of the sensor capacitor at a full scale pressure, and wherein the bridge voltage is at a maximum amplitude when the pressure is at vacuum and a fold-over-pressure at which the bridge voltage is at the minimum amplitude is greater than a full-scale pressure.