Current driven bipolar high voltage driver for capacitive loads
First Claim
1. A circuit for generating a high voltage alternating current to drive a load comprising:
- a charge pump having a first terminal and a second terminal;
an output terminal;
a circuit ground terminal;
a pair of output capacitive elements attached to the charge pump and the circuit ground terminal to reduce frequency fluctuations, wherein a first output capacitive element is attached to the first terminal of the charge pump and to the circuit ground terminal and a second output capacitive element is attached to the second terminal of the charge pump and to the circuit ground terminal;
a first switch wherein a first switch first terminal is connected to the first terminal of the charge pump and the first output capacitive element, a first switch second terminal is attached to the circuit ground terminal, the first switch conducting between the first terminal of the charge pump and the circuit ground terminal when the first switch is closed;
a second switch wherein a second switch first terminal is connected to the first terminal of the charge pump and the first output capacitive element, a second switch second terminal is attached to the load terminal, the second switch conducting between the first terminal of the charge pump and the output terminal when the second switch is closed;
a third switch wherein a third switch first terminal is connected to the circuit ground terminal and a third switch second terminal is attached to the second terminal of the charge pump and the second output capacitive element, the third switch conducting between the second terminal of the charge pump and the circuit ground terminal when the third switch is closed;
a fourth switch wherein a fourth switch first terminal is connected to the load terminal and a fourth switch second terminal is attached to the second terminal of the charge pump and the second output capacitive element, the fourth switch conducting between the second terminal of the charge pump and the output terminal when the fourth switch is closed; and
a load coupled to the output terminal and the circuit ground terminal;
wherein both the first terminal and the second terminal of the charge pump float to interchange which of the first terminal and the second terminal of the charge pump is grounded to the load;
wherein the charge pump is a capacitive charge pump providing an approximately constant current output across variable load voltages;
wherein a minimum terminal count of the circuit is 3.
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Accused Products
Abstract
A circuit for generating a high voltage alternating current to drive a load has a current source having a first terminal and a second terminal. The circuit further has an output terminal and a circuit ground terminal. A first switch will conduct between the first terminal of the current source and the circuit ground terminal when the first switch is closed. A second switch will conduct between the first terminal of the current source and the output terminal when the second switch is closed. A third switch will conduct between the second terminal of the current source and the circuit ground terminal when the third switch is closed. A fourth switch will conduct between the second terminal of the current source and the output terminal when the fourth switch is closed. A load is coupled to the output terminal and the circuit ground terminal.
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Citations
19 Claims
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1. A circuit for generating a high voltage alternating current to drive a load comprising:
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a charge pump having a first terminal and a second terminal; an output terminal; a circuit ground terminal; a pair of output capacitive elements attached to the charge pump and the circuit ground terminal to reduce frequency fluctuations, wherein a first output capacitive element is attached to the first terminal of the charge pump and to the circuit ground terminal and a second output capacitive element is attached to the second terminal of the charge pump and to the circuit ground terminal; a first switch wherein a first switch first terminal is connected to the first terminal of the charge pump and the first output capacitive element, a first switch second terminal is attached to the circuit ground terminal, the first switch conducting between the first terminal of the charge pump and the circuit ground terminal when the first switch is closed; a second switch wherein a second switch first terminal is connected to the first terminal of the charge pump and the first output capacitive element, a second switch second terminal is attached to the load terminal, the second switch conducting between the first terminal of the charge pump and the output terminal when the second switch is closed; a third switch wherein a third switch first terminal is connected to the circuit ground terminal and a third switch second terminal is attached to the second terminal of the charge pump and the second output capacitive element, the third switch conducting between the second terminal of the charge pump and the circuit ground terminal when the third switch is closed; a fourth switch wherein a fourth switch first terminal is connected to the load terminal and a fourth switch second terminal is attached to the second terminal of the charge pump and the second output capacitive element, the fourth switch conducting between the second terminal of the charge pump and the output terminal when the fourth switch is closed; and a load coupled to the output terminal and the circuit ground terminal; wherein both the first terminal and the second terminal of the charge pump float to interchange which of the first terminal and the second terminal of the charge pump is grounded to the load; wherein the charge pump is a capacitive charge pump providing an approximately constant current output across variable load voltages; wherein a minimum terminal count of the circuit is 3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A circuit for generating a high voltage alternating current to drive a load comprising:
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a current source having a first terminal and a second terminal; an output terminal; a circuit ground terminal; a first shaping capacitor attached to the first terminal of the current source and to the circuit ground terminal to reduce frequency fluctuations from the first terminal of the current source; a second shaping capacitor attached to the second terminal of the current source and to the circuit ground terminal to reduce frequency fluctuations from the second terminal of the current source; a first switch wherein a first switch first terminal is connected to the first terminal of the current source and a first switch second terminal is attached to the circuit ground terminal, the first switch conducting between the first terminal of the current source and the circuit ground terminal when the first switch is closed; a second switch wherein a second switch first terminal is connected to the first terminal of the current source and a second switch second terminal is attached to the load terminal, the second switch conducting between the first terminal of the current source and the output terminal when the second switch is closed; a third switch wherein a third switch first terminal is connected to the circuit ground terminal and a third switch second terminal is attached to the second terminal of the current source, the third switch conducting between the second terminal of the current source and the circuit ground terminal when the third switch is closed; a fourth switch wherein a fourth switch first terminal is connected to the load terminal and a fourth switch second terminal is attached to the second terminal of the current source, the fourth switch conducting between the second terminal of the current source and the output terminal when the fourth switch is closed; a load coupled to the output terminal and the circuit ground terminal; wherein the first switch, the second switch, the third switch and the fourth switch open and close to alternately connect the current source in series with the load with one of two polarities, the second switch and the third switch closing to charge the load in a first polarity and the first switch and the fourth switch closing to charge the load in a second polarity; wherein both the first terminal and the second terminal of the current source float to interchange which of the first terminal and the second terminal of the current source is grounded to the load; wherein the current source is a capacitive charge pump providing an approximately constant current output across variable load voltages; wherein a minimum terminal count of the circuit is 3. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification