Method and arrangement for efficiently generating current with a high rate of change
First Claim
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1. A method for generating current with a high rate of change, comprising:
- generating current by at least two separate current elements, each comprising switches and an inductor having an adjustment end and a load coupling end;
setting a current value of the inductor by switching the adjustment end between a supply voltage and ground through one or more first switches; and
switching the load coupling end to a load via a second switch when the second switch is in a first state, and connecting the load coupling end to the ground or the supply voltage when the second switch is in a second state,wherein envelope tracking is applied such that the current elements are connected in parallel through the second switches to an output point when a current change with high rate of change is required at the load, and such that the current elements are connected to the ground or the supply voltage when the current of the current elements are not required at the load.
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Abstract
The invention relates to power supplies where the output current is controllable. In prior art, there is a problem to provide both high rate of change in the current output and high efficiency. The solution of the present invention is based on combining current elements, whereby the current is controlled by switching the outputs of the current elements. The current elements can be implemented with e.g. buck converters, whereby the power dissipation is small.
34 Citations
14 Claims
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1. A method for generating current with a high rate of change, comprising:
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generating current by at least two separate current elements, each comprising switches and an inductor having an adjustment end and a load coupling end; setting a current value of the inductor by switching the adjustment end between a supply voltage and ground through one or more first switches; and switching the load coupling end to a load via a second switch when the second switch is in a first state, and connecting the load coupling end to the ground or the supply voltage when the second switch is in a second state, wherein envelope tracking is applied such that the current elements are connected in parallel through the second switches to an output point when a current change with high rate of change is required at the load, and such that the current elements are connected to the ground or the supply voltage when the current of the current elements are not required at the load. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An arrangement for generating current with a high rate of change, the arrangement comprising:
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at least two separate current elements each comprising switches and an inductor which has an adjustment end and a load coupling end; one or more first switches configured to switch the adjustment end between a supply voltage and ground for setting a current value of the inductor; and a second switch configured to connect a load coupling end between a load in a first state, and to connect the load coupling end to the ground or to the supply voltage in a second state, wherein, for applying envelope tracking, the second switches are arranged to connect the current elements in parallel to an output point when a current change with high rate of change is required at the load, and to connect the current elements to the ground or the supply voltage when the current of the current elements are not required at the load. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification