Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1990-06-21
1992-02-18
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307257, 307494, H03K 1774, G11C 2702
Patent
active
050897209
ABSTRACT:
A sample-and-hold circuit comprising a diode bridge that includes a first serial branch including first (T.sub.1) and second (D.sub.3) D.C. diodes connected in parallel with a second serial branch including third (T.sub.2) and fourth (D.sub.4) D.C. diodes. At least one end (B) common to the above two serial branches is connected to a first switchable current source (T.sub.3, T.sub.4, I) providing a sampling state in which the current source (I) is coupled to the first common end (B) and a blocking state in which it is uncoupled from the first common end (B). The first branch comprises an input terminal (E) for receiving an input voltage, and the second serial branch includes an output terminal (S) connected to a memory capacitor. In order to switch the bridge by means of a single current source, the third diode is constituted by the base-emitter path of a first transistor (T.sub.2) whose collector is connected to a supply voltage source. The second common end (A) of said two branches is now the junction point of the first (T.sub.1) and third (T.sub.2) diodes and a first resistor (R) is inserted between the second common end (A) and the supply voltage source (V.sub.cc). The first switchable current source is connected to the second common end (A) in the blocking state.
REFERENCES:
patent: 3643110 (1972-02-01), Thompson
patent: 3721829 (1973-03-01), Benson
patent: 4518921 (1985-05-01), Logan
patent: 4540902 (1985-09-01), Ishikawa
patent: 4636659 (1987-01-01), Sugimoto
patent: 4728819 (1988-03-01), Vu
Franzblau Bernard
U.S. Philips Corporation
Zazworsky John
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