Invention Grant
- Patent Title: Common-mode insensitive current-sensing topology in full-bridge driver with high-side and low-side energy matching calibration
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Application No.: US16864893Application Date: 2020-05-01
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Publication No.: US11296663B2Publication Date: 2022-04-05
- Inventor: Ramin Zanbaghi , Cory J. Peterson , Anand Ilango , Eric Kimball
- Applicant: Cirrus Logic International Semiconductor Ltd.
- Applicant Address: GB Edinburgh
- Assignee: Cirrus Logic International Semiconductor Ltd.
- Current Assignee: Cirrus Logic International Semiconductor Ltd.
- Current Assignee Address: GB Edinburgh
- Agency: Jackson Walker L.L.P.
- Main IPC: H03F3/217
- IPC: H03F3/217 ; H03F3/45 ; H04R1/10 ; H04R17/00

Abstract:
A system may include a Class-D stage comprising a first high-side switch coupled between a supply voltage and a first output terminal of the Class-D stage, a second high-side switch coupled between the supply voltage and a second output terminal of the Class-D stage, a first low-side switch coupled between a ground voltage and the first output terminal, and a second low-side switch coupled between the ground voltage and the second output terminal. The system may also include current sensing circuitry comprising a first sense resistor coupled between the first low-side switch and the ground voltage, such that an output current through a load coupled between the first output terminal and the second output terminal causes a first sense voltage proportional to the output current across the first sense resistor when the first low-side switch is activated. The current sensing circuitry may also include a second sense resistor coupled between the second low-side switch and the ground voltage, such that an output current through the load causes a second sense voltage proportional to the output current across the second sense resistor when the second low-side switch is activated. The system may also include measurement circuitry configured to measure the first sense voltage and the second sense voltage to determine the output current.
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Information query
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