CURRENT DETECTION CIRCUIT, CIRCUIT ARRANGEMENT, AND SOLENOID CONTROL UNIT
To provide a current detection circuit that can level shift input voltage by an appropriate level shift amount according to common mode voltage.SOLUTION: A current detection circuit 110 includes an operational amplifier OPA, a current sense amplifier circuit 120 including resistances RIP, RIN, and a...
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Main Authors | , |
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Format | Patent |
Language | English Japanese |
Published |
13.10.2022
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Subjects | |
Online Access | Get full text |
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Summary: | To provide a current detection circuit that can level shift input voltage by an appropriate level shift amount according to common mode voltage.SOLUTION: A current detection circuit 110 includes an operational amplifier OPA, a current sense amplifier circuit 120 including resistances RIP, RIN, and a level shift circuit 130. The resistance RIP is provided between one end of a shunt resistance 12 and an input node NIP of the operational amplifier OPA. The resistance RIN is provided between the other end of the shunt resistance 12 and an input node NIN of the operational amplifier. The level shift circuit 130 supplies currents IP, IN to the input nodes NIP, NIN. The level shift circuit 130 variably controls the currents IP, IN according to voltage VLS at one end of the shunt resistance 12 to level shift voltages VIP, VIN of the input nodes NIP, NIN by a variable level shift amount according to the voltage VLS.SELECTED DRAWING: Figure 2
【課題】コモンモード電圧に応じた適切なレベルシフト量で、入力電圧をレベルシフトできる電流検出回路等を提供すること。【解決手段】電流検出回路110は、オペアンプOPAと、抵抗RIP、RINを含む電流センスアンプ回路120と、レベルシフト回路130と、を含む。抵抗RIPは、シャント抵抗12の一端と、オペアンプOPAの入力ノードNIPとの間に設けられる。抵抗RINは、シャント抵抗12の他端と、オペアンプの入力ノードNINとの間に設けられる。レベルシフト回路130は、電流IP、INを入力ノードNIP、NINに供給する。レベルシフト回路130は、電流IP、INを、シャント抵抗12の一端の電圧VLSに応じて可変に制御することで、入力ノードNIP、NINの電圧VIP、VINを、電圧VLSに応じて可変のレベルシフト量でレベルシフトする。【選択図】 図2 |
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Bibliography: | Application Number: JP20210056395 |