Output Voltage Control of a Charge Pump by Duty Ratio of the Clock Signal and its Application to a Charge Pump using 2-step Charging Technique

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  • チャージポンプ回路の制御信号のデューティ比による出力電圧の制御と2ステップ充電技術を用いたチャージポンプ回路への応用
  • チャージポンプ カイロ ノ セイギョ シンゴウ ノ デューティヒ ニ ヨル シュツリョク デンアツ ノ セイギョ ト 2 ステップ ジュウデン ギジュツ オ モチイタ チャージポンプ カイロ エ ノ オウヨウ

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Abstract

This paper proposes a novel output voltage control method for a charge pump. The proposed method uses duty ratio of a clock signal to control the output voltage of a charge pump. Theoretical analysis of the relation between the duty ratio and the output voltage is performed. The proposed method is applied to a charge pump using 2-step charging technique. A determination procedure of a set of duty ratios which realizes the desired output voltage with the maximum power efficiency is explained. Validity of the proposed method is confirmed by HSPICE simulations. The simulation results show that the output voltage of the charge pump is controlled by the proposed method and the output voltage accords with the value estimated by the theoretical analysis. The power efficiency is improved in 7.2% when the output voltage is controlled to 4.5 V.

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