Voltage multiplier with linearly stabilized output voltage
First Claim
1. An output voltage stabilization circuit for a voltage multiplier having an input terminal, an output terminal, a charge transfer capacitor designed to take and transfer electrical charges from the input terminal to the output terminal, said stabilization circuit comprising:
- an integrator having a first input coupled with the output terminal of the multiplier, a second input for receiving a reference voltage and an output for generating a continuous voltage corresponding to the difference between the reference voltage and the output voltage of the voltage multiplier;
wherein said continuous voltage is applied to one terminal of said charge transfer capacitor.
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Accused Products
Abstract
A voltage multiplier includes a first charge transfer capacitor designed to take and transfer electrical charges from the input terminal to the output terminal, a second capacitor for charge storage connected between the output terminal and ground and an output voltage stabilization circuit. The output voltage stabilization circuit includes an integrator designed to generate a continuous voltage corresponding to the difference between a reference voltage and the output voltage of the voltage multiplier. The continuous voltage is applied to one terminal of said charge transfer capacitor so that the potential at the other terminal of the capacitor changes proportionally to the output voltage of the voltage multiplier.
36 Citations
19 Claims
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1. An output voltage stabilization circuit for a voltage multiplier having an input terminal, an output terminal, a charge transfer capacitor designed to take and transfer electrical charges from the input terminal to the output terminal, said stabilization circuit comprising:
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an integrator having a first input coupled with the output terminal of the multiplier, a second input for receiving a reference voltage and an output for generating a continuous voltage corresponding to the difference between the reference voltage and the output voltage of the voltage multiplier; wherein said continuous voltage is applied to one terminal of said charge transfer capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A voltage multiplier comprising:
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at least one first charge transfer capacitor and a second capacitor for charge storage; a first switch connecting to a first reference voltage a first terminal of said first charge transfer capacitor; a second switch connecting to a second reference voltage a second terminal of said first charge transfer capacitor; a third switch connecting to a first terminal of said second capacitor constituting an output node of the multiplier said second terminal of said first charge transfer capacitor; the first and second switches being controlled by a first driving phase signal and said third switch being controlled by a second driving phase signal; an operational amplifier having a non-inverting input to which is applied a third reference voltage, an inverting input connected to said output node by means of a voltage divider and to the output of the amplifier by means of an impedance; and a fourth switch connected between the output of the operational amplifier and said first terminal of the first charge transfer capacitor. - View Dependent Claims (9, 10)
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11. A voltage multiplier comprising:
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at least a first charge transfer capacitor and a second capacitor for charge storage; a first switch designed to connect to a first reference voltage a first terminal of said first charge transfer capacitor; a second switch designed to connect to a first terminal of said second capacitor constituting an output node of the multiplier the first terminal of said first charge transfer capacitor; said first switch being controlled by a first driving phase signal and said second switch being controlled by a second driving phase signal; an operational amplifier having a non-inverting input connected by means of a third switch controlled by a first timing signal coinciding and in phase with said second driving phase signal to a second reference voltage and by means of a fourth switch controlled by a second timing signal coinciding and in phase with said first driving phase signal to a third reference voltage, an inverting input connected to said output node by means of a voltage divider and to the output of the operational amplifier by means an impedance and a fifth switch in series. - View Dependent Claims (12, 13)
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14. Method for multiplying voltage comprising the steps of:
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alternately coupling a first terminal of a charging capacitor to a first supply voltage terminal or to a second supply voltage terminal, respectively in response to first and second control signals; sensing the output voltage; generating an error signal proportional to a difference between the output voltage and a reference voltage; and controlling the amplitude of the second supply voltage in response to the error signal to maintain the output voltage at a constant level. - View Dependent Claims (15, 16)
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17. Voltage multiplier comprising:
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a charge pump circuit including a charging capacitor having a first terminal connected to an alternating voltage which varies periodically from a first voltage level to a second voltage level, respectively in response to a first and a second control signals; a sensing circuit connected to an output of the charge pump circuit; and a control circuit, connected to an output of the sensing circuit, for varying the amplitude of the second voltage level to maintain the output voltage of the voltage multiplier at a constant level. - View Dependent Claims (18, 19)
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Specification