Cross-coupled charge pump and method of operation thereof
A cross-coupling, charge pump technology, applied in electrical components, conversion equipment without intermediate conversion to AC, output power conversion devices, etc., can solve problems such as reducing efficiency
Active Publication Date: 2022-01-04
SEMICON COMPONENTS IND LLC
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Problems solved by technology
However, it takes a finite amount of time for a FET to change from a conducting state to a non-conducting state and vice versa
In some cases, partially conductive FETs in a cross-coupled charge pump can allow current to flow back from the voltage output to the voltage input, reducing efficiency
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[0032] The following discussion refers to various embodiments of the invention. While one or more of these embodiments may be preferred, the disclosed embodiments should not be interpreted or otherwise used to limit the scope of the disclosure, including the claims. Additionally, those skilled in the art should appreciate that the following description has broad application and that discussion of any implementation is meant to be an illustration of that implementation only, and is not intended to limit the scope of the present disclosure, including the claims, to that implementation. plan.
[0033] Various embodiments relate to improved cross-coupled charge pumps. More specifically, various exemplary embodiments relate to cross-coupled charge pumps that reduce or eliminate reverse current flow from a voltage output to a voltage input. The reduced reverse current not only improves operating efficiency, but also enables increased clock frequency. The increased clock frequency...
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The present invention is entitled "Cross-Coupled Charge Pumps and Methods of Operation Thereof". The subject application relates to cross-coupled charge pumps and methods of operation thereof. At least some of the exemplary embodiments are methods comprising: pumping charge from a first capacitor through a first field effect transistor (FET) to a voltage output, and from a second capacitor through a second FET to the the voltage output of the charge pump; refresh the charge of the third capacitor and the fourth capacitor during the pumping of charge; electrically isolate the first capacitor to the fourth capacitor during the dead time; and then charge is pumped from the third capacitor to the voltage output through a third FET, and from the fourth capacitor to the voltage output of the charge pump through a fourth FET; and The charges of the first capacitor and the second capacitor are refreshed during charge pumping of the capacitor and the fourth capacitor.
Description
technical field [0001] This application relates to the technical field of power converters, and in particular cross-coupled charge pumps. Background technique [0002] The power converter converts electrical energy at a first voltage to a second voltage. A charge pump is a type of power converter that increases voltage such that the voltage output is higher than the voltage input. One type of charge pump is a cross-coupled charge pump. Related art cross-coupled charge pumps experience undesired cross-conduction, which reduces operating efficiency. Specifically, a cross-coupled charge pump uses a field effect transistor (FET) to selectively pump charge from a charging capacitor to a voltage output, and simultaneously uses another FET to refresh the voltage on a second capacitor. The pumping and charge roles of the two capacitors alternate. However, it takes a finite amount of time for a FET to change from a conducting state to a non-conducting state and vice versa. In so...
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IPC IPC(8): H02M3/07
CPCH02M3/073H02M3/077H02M3/07H02M1/0041H02M1/0083
Inventor 皮埃尔·热内
Owner SEMICON COMPONENTS IND LLC