G - Physics
05
F
323/4
G05F 5/00 (2006.01) G04G 19/04 (2006.01) H02M 3/07 (2006.01)
Patent
CA 1060543
ABSTRACT The present invention provides an inexpensive voltage boosting circuit for electronic watches, calculators, etc. which may readily be miniaturized by integrated circuit techniques. The circuit comprises a plurality of boosting units connected in series, each of such units comprising a capacitor having first and second terminals and a first field-effect transistor. The field-effect transistor of a first unit is connected between a terminal of the capacitor and a terminal adapted for connection to one side of a power source so as to connect the capacitor terminal with the power source when the transistor is conductive. The first field-effect transistor of a succeeding unit is connected between the capacitor terminal in the preceeding unit and the capacitor terminal in the succeeding unit so as to provide a current path between the capacitor terminals when the last-mentioned transistor is conductive. Switch- ing means are provided for the first transistor in each said unit, such switching means comprising a second field-effect transistor having a source electrode connected to a second terminal adapted for connection to the power source. A third field-effect transistor is also part of the switching means, such transistor having a source electrode connected to the source electrode of said first-mentioned field-effect transistor and to the first terminal of the capacitor. The drain electrodes of the second and third transistors are con- nected to the gate electrode of the first transistor and means are provided for applying a pulse signal to the gate electrodes of the second and third transistors. Preferably, the field-effect tran- sistors are of the metal oxide semiconductor type (MOS-FETS).
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