Electricity: power supply or regulation systems – Remote sensing
Patent
1975-06-02
1976-09-21
Goldberg, Gerald
Electricity: power supply or regulation systems
Remote sensing
321 2, 323 22T, 323DIG1, G05F 156
Patent
active
039821749
ABSTRACT:
To convert an unregulated input voltage applied across an input and a reference terminal to a regulated output voltage across a load between the reference and an output terminal, a switching transistor is connected in series with an induction coil between the input and the output terminals. A flyback diode is connected between the reference terminal and the juncture between the transistor and the first coil, and is poled to be reverse biased when the transistor is conductive. The transistor is cyclically (a) switched from full conduction to cutoff to interrupt a current flow between the input and the output terminals and through the coil to induce a voltage across the coil to establish a current flow between the reference and the output terminals and through the diode, (b) switched from cutoff to partial conduction at a controlled rate to reduce the current flow through the diode at a relatively slow, controlled rate, and (c) rapidly switched from partial conduction to full conduction when the current flow through the diode has been reduced to a predetermined value. The gradual reduction of current flow through the diode reduces "snap off" of the diode and minimizes RFI (radio frequency interference) noise generated thereby, and the value of the regulated output voltage is controlled by the duty cycle of the transistor.
REFERENCES:
patent: 3577065 (1971-05-01), Putzrath et al.
patent: 3641424 (1972-02-01), Kuykendall
patent: 3736495 (1973-05-01), Calkin et al.
patent: 3742330 (1973-06-01), Hodges et al.
patent: 3745444 (1973-07-01), Calkin et al.
patent: 3781642 (1973-09-01), Dutton
Solid State Design Apr. 1963, pp. 30-34, "Considerations in the Design of Switching Type Regulator," by R. D. Loucks.
Dosse W. G.
Goldberg Gerald
Miller R. P.
Western Electric Company Inc.
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