High performance charge pump of preventing countercurrent, and method for converting voltage

Abstract

First and second clocks are applied to first and second capacitors respectively. First and second preceding stage clocks are applied to first and second preceding stage capacitors. The first switch is coupled to second preceding stage capacitor and first capacitor. The second switch is coupled to first preceding stage capacitor and second capacitor. First circuit of preventing countercurrent makes control pole of first switch be coupled to second capacitor and second preceding stage capacitor alternately. Second circuit of preventing countercurrent makes control pole of second switch be coupled to first capacitor and first preceding stage capacitor alternately. Trailing edges of first and second clocks are earlier than trailing edges of first and second preceding stage clocks respectively. Rising edges of first and second preceding stage clocks are earlier than trailing edges of first and second clocks respectively.

Description

Technical field [0001] The invention relates to a charge pump and a method for converting voltage, in particular to a charge pump and a method for converting voltage that can prevent the occurrence of reverse current, thereby realizing a high-efficiency voltage conversion function. Background technique [0002] FIG. 1 shows a detailed circuit diagram of a conventional charge pump 10. NMOS transistor N 1 With N 2 Of the first current electrodes are coupled to a supply voltage source V in . NMOS transistor N 1 The control electrode is coupled to the NMOS transistor N 2 The second current electrode, and the NMOS transistor N 2 The control electrode is coupled to the NMOS transistor N 1 The second current electrode. Capacitor C 1 The first electrode is coupled to the NMOS transistor N 1 The second current electrode, and the capacitor C 2 The first electrode is coupled to the NMOS transistor N 2 The second current electrode. [0003] NMOS transistor N 3 The first current electrode is ...

AI Technical Summary

Problems solved by technology

In the case of such a transition reverse current occurs, the capacitor C 3 The first electrode cannot be fully charged to the desired 2*V in , resulting later when the clock signal CLK 3 When changing from a low potential to a high potential, such as time point B shown in Figure 2(b), capacitor C 3 The first electrode cannot be pushed up to the desired voltage of 3*V in

As a result, the charge pump 10 generates the pump voltage V pp reduced efficiency

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