Electricity: power supply or regulation systems – Including an impedance – In a bridge
Patent
1997-08-18
1999-04-06
Pihulic, Daniel T.
Electricity: power supply or regulation systems
Including an impedance
In a bridge
H03H 100
Patent
active
H00017930
ABSTRACT:
A pyrotechnic device (UUT) is automatically tested for thermal response cacteristics using an automatically balanced Wheatstone bridge. One branch of the bridge is a series of relay connected resistances which are selectively connected to coursely balance the bridge using a voltage developed across the UUT. An FET in series with the series of resistances, in response to the bridge null currents, finely balances the bridge. A low constant current pulse is used to generate a voltage across the UUT and to balance the bridge. A second high constant current pulse is used to measure the transient thermal response of the UUT. The transient test current pulses are generated automatically or manually and whose amplitude and repetition rate are manually set. The pulses are generated by a D/A converter whose output is fed to a constant current generator coupled to a manually settable resistance range for setting the value of the high current transient test pulse amplitude. The lower value initial balance current pulse is separately settable by internal calibration switches and straps. The entire test is less than 40 ms.
REFERENCES:
patent: 3784906 (1974-01-01), Ironside
patent: 4209837 (1980-06-01), Brown
patent: 4408157 (1983-10-01), Beaubien
patent: 4481596 (1984-11-01), Townzen
patent: 5272445 (1993-12-01), Lloyd
Peterson Ronald H.
Pickens Keith S.
Pihulic Daniel T.
Sachs Michael
The United States of America as represented by the Secretary of
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