US 6,556,069 B1 · Voltage generating circuit

Abstract

The invention relates to a voltage generating circuit having: a voltage input (1); voltage boosting means (2), having an input (3) and an output (4); means (6) for varying the voltage supply level of the input to the said boosting means (2) from the said voltage input of the circuit, capable, on one hand, in a first state, of permitting the application, at the input to the said boosting means (2), of a fraction, that is possibly limited, of the voltage input to the circuit and, in a second state, of increasing the level of voltage applied to the said input to the boosting means (2) and, on the other hand, of permitting the change-over from the said first to the said second state according to a triggering signal, obtained by feedback of the output voltage from the said boosting means (2) to the said means (6) for varying the voltage level, so as to optimize the production at the output from the said boosting means (2) of a desired voltage level.

Claims22

Dependent claims

A voltage generating circuit comprising:

a voltage input;
voltage boosting means having an input and an output;
means for varying the voltage level at the input to said boosting means, said means for varying having a first state that applies a fraction of a voltage at said voltage input to the input of said boosting means and a second state that increases the level of voltage applied to the input of said boosting means, and on the other hand, permitting the change-over from said first state to the said second state according to a triggering signal obtained by feedback of an output voltage from said boosting means to said means for varying the voltage level;
and
means for limiting the voltage range that is input into said means for varying the voltage level, wherein said voltage range is less than or equal to a predetermined maximum range that is independent of the voltage at said voltage input, and said means for limiting the voltage range connected to said voltage input.

2 more elements

A voltage generating circuit, comprising:

a voltage input;
a voltage boosting circuit having an input and an output;
a variable voltage circuit connected to the input of said voltage boosting circuit, said variable voltage circuit having a first state that applies a fraction of the voltage at said voltage input to the input of said voltage boosting circuit, and having a second state that increases the level of voltage applied to the input of said voltage boosting circuit, and said variable voltage circuit being capable of switching from the first state to the second state according to a triggering signal obtained by feedback of an output voltage from said voltage boosting circuit to said variable voltage circuit;
and
a voltage limiting circuit connected to said variable voltage circuit, said voltage limiting circuit limiting the voltage range input to said variable voltage circuit, wherein said voltage range is less than or equal to a predetermined maximum voltage that is independent of the voltage at said voltage input.

2 more elements

Dependencies are inferred from the claim text.

Voltage generating circuit

Life of this patent

Voltage generating circuit

Life of this patent

Abstract

Claims22