High voltage DC/DC converter with cascaded resonant tanks
First Claim
1. A converter for use in high voltage direct and alternating current power transmission, the converter comprising a primary charge transfer converter, including first and second primary terminals for connection to one or more electrical networks, a plurality of charge transfer elements, and a plurality of primary switching elements connected in a single series connected circuit between the first and second primary terminals, each charge transfer element including at least one resonant circuit having a resonant frequency, the plurality of charge transfer elements and the plurality of primary switching elements being connected in a cascade circuit wherein the plurality of charge transfer elements comprise a first set of charge transfer elements connected in series between the first and second primary terminals and a second set of charge transfer elements connected in series, each charge transfer element being connected in parallel with a different set of at least one primary switching element, a primary switching element of each different set of at least one primary switching element being shared in parallel with a charge transfer element of said first set and a charge transfer element of said second set, and wherein the primary switching elements are operable at a frequency equal or approximately equal to the resonant frequency of the resonant circuit to selectively cause charging and discharging of each resonant circuit to transfer charge between the charge transfer elements and thereby create a voltage difference between the first and second primary terminals.
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Accused Products
Abstract
A converter, for use in high voltage direct and alternating current power transmission comprises a primary charge transfer converter. The charge transfer converter includes first and second primary terminals for connection to one or more electrical networks. The primary charge transfer converter also includes a plurality of charge transfer elements and a plurality of primary switching elements which are connected in a cascade circuit between the first and second primary terminals. Each charge transfer element includes at least one resonant circuit. The primary switching elements are operable to selectively cause charging and discharging of each resonant circuit to transfer charge between the charge transfer elements and thereby create a voltage difference between the first and second primary terminals.
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Citations
24 Claims
- 1. A converter for use in high voltage direct and alternating current power transmission, the converter comprising a primary charge transfer converter, including first and second primary terminals for connection to one or more electrical networks, a plurality of charge transfer elements, and a plurality of primary switching elements connected in a single series connected circuit between the first and second primary terminals, each charge transfer element including at least one resonant circuit having a resonant frequency, the plurality of charge transfer elements and the plurality of primary switching elements being connected in a cascade circuit wherein the plurality of charge transfer elements comprise a first set of charge transfer elements connected in series between the first and second primary terminals and a second set of charge transfer elements connected in series, each charge transfer element being connected in parallel with a different set of at least one primary switching element, a primary switching element of each different set of at least one primary switching element being shared in parallel with a charge transfer element of said first set and a charge transfer element of said second set, and wherein the primary switching elements are operable at a frequency equal or approximately equal to the resonant frequency of the resonant circuit to selectively cause charging and discharging of each resonant circuit to transfer charge between the charge transfer elements and thereby create a voltage difference between the first and second primary terminals.
Specification