Voltage converter
First Claim
Patent Images
1. A voltage converter comprising a first supply terminal (1), a second supply terminal (2), an output terminal (3);
- a first charge pump comprising a first capacitor (C1) with a first (4) and a second electrode (5), first means for alternately coupling either the first electrode (4) of the first capacitor (C1) to the first supply terminal (1) and the second electrode (5) of the first capacitor (C1) to the second supply terminal (2), or the second electrode (5) of the first capacitor (C1) to the first supply terminal (1);
a second charge pump comprising a second capacitor (C2) with a first electrode (6) and a second electrode (7), second means for alternately coupling, in phase with the first means, of either the first electrode (6) of the second capacitor (C2) to the first supply terminal (1) and the second electrode (7) of the second capacitor (C2) to the second supply terminal (2), or the second electrode (7) of the second capacitor (C2) to the first supply terminal (1); and
a first unidirectional element coupled between the first electrode (4) of the first capacitor (C1) and the output terminal (3), characterized in that the first unidirectional element comprises a first output transistor (TU1) with a control electrode (GU1) which is coupled to the first electrode (6) of the second capacitor (C2), a first main electrode (DU1) coupled to the first electrode (4) of the first capacitor (C1), and a second main electrode (DU1) coupled to the output terminal (3).
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Abstract
A voltage converter provided with charge pumps in which conventional rectifier diodes are replaced by output transistors. The output transistors at the same time act as voltage stabilizers. This also renders the ripple value of the voltage at the output terminal low when no smoothing capacitor, or a smoothing capacitor with a comparatively low capacitance value, is coupled to the output terminal.
28 Citations
20 Claims
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1. A voltage converter comprising a first supply terminal (1), a second supply terminal (2), an output terminal (3);
- a first charge pump comprising a first capacitor (C1) with a first (4) and a second electrode (5), first means for alternately coupling either the first electrode (4) of the first capacitor (C1) to the first supply terminal (1) and the second electrode (5) of the first capacitor (C1) to the second supply terminal (2), or the second electrode (5) of the first capacitor (C1) to the first supply terminal (1);
a second charge pump comprising a second capacitor (C2) with a first electrode (6) and a second electrode (7), second means for alternately coupling, in phase with the first means, of either the first electrode (6) of the second capacitor (C2) to the first supply terminal (1) and the second electrode (7) of the second capacitor (C2) to the second supply terminal (2), or the second electrode (7) of the second capacitor (C2) to the first supply terminal (1); and
a first unidirectional element coupled between the first electrode (4) of the first capacitor (C1) and the output terminal (3), characterized in that the first unidirectional element comprises a first output transistor (TU1) with a control electrode (GU1) which is coupled to the first electrode (6) of the second capacitor (C2), a first main electrode (DU1) coupled to the first electrode (4) of the first capacitor (C1), and a second main electrode (DU1) coupled to the output terminal (3). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- a first charge pump comprising a first capacitor (C1) with a first (4) and a second electrode (5), first means for alternately coupling either the first electrode (4) of the first capacitor (C1) to the first supply terminal (1) and the second electrode (5) of the first capacitor (C1) to the second supply terminal (2), or the second electrode (5) of the first capacitor (C1) to the first supply terminal (1);
Specification