High voltage full bridge circuit and method for operating the same
First Claim
1. In an environment comprising an output circuit for providing an AC voltage, wherein the output circuit comprises a first, second, third and fourth switch, a method of operating the output circuit comprising:
- (a) operating the switches so that the first and fourth switch are on and the second and third switch are off for a first period of time;
(b) after said first period of time has expired, operating the switches so that the first and fourth switch are off and the second and third switch are on for a second period of time; and
(c) after said second period of time has expired, repeating steps (a) and (b) one or more times,wherein the switches are connected in series such that the second switch is connected directly between the first switch and the third switch and the third switch is connected directly between the second switch and the fourth switch.
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Accused Products
Abstract
Switches (such as FET'"'"'s and other devices) are often used in circuits to generate an AC signal from a DC supply input. There are times when the supplied DC voltage is greater than desired for the ratings of the switches that can or must be used. There are also times when there may be voltage surges or other transient high voltage conditions for which it is desired to have greater margin between the voltage applied and the switch ratings. The circuit described applies across any of the switches a maximum of one half of the supplied DC voltage. The circuit may also be operated in a linear mode for use with analog signals.
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Citations
15 Claims
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1. In an environment comprising an output circuit for providing an AC voltage, wherein the output circuit comprises a first, second, third and fourth switch, a method of operating the output circuit comprising:
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(a) operating the switches so that the first and fourth switch are on and the second and third switch are off for a first period of time; (b) after said first period of time has expired, operating the switches so that the first and fourth switch are off and the second and third switch are on for a second period of time; and (c) after said second period of time has expired, repeating steps (a) and (b) one or more times, wherein the switches are connected in series such that the second switch is connected directly between the first switch and the third switch and the third switch is connected directly between the second switch and the fourth switch. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A circuit apparatus for providing an AC voltage to a load, comprising:
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a first, second, third and fourth switch, wherein the switches are connected in series such that the second switch is connected directly between the first switch and the third switch and the third switch is connected directly between the second switch and the fourth switch; a voltage source, wherein the voltage source is electrically connected directly between the first switch and the fourth switch; a resistive divider connected across the voltage source; a first resistor connected in parallel with the first switch; and a second resistor connected in parallel with the third switch wherein the sum of (a) the voltage across the first switch, (b) the voltage across the second switch, (c) the voltage across the third switch, and (d) the voltage across the first switch is equal to the voltage produced by the voltage source. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification