Voltage monitor using a capacitive digital-to-analog converter

US11372032B2 · kind B2 · utility

Assignee

• TEXAS INSTRUMENTS INCORPORATED · US

Inventors

• Rajat Chauhan · Bengaluru, IN
• Danielle Griffith · Richardson, US
• Per Torstein Roine · Oslo, NO
• James Murdock · Richardson, US
• Bernhard Wolfgang Ruck · Freising, DE

Key dates

• Filing date: Sep 27, 2017
• Grant date: Jun 28, 2022
• Expiry date: Apr 24, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M1/66
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

One example relates to a monitoring circuit that includes a capacitive digital-to-analog converter that receives a binary code, a reference voltage, a monitored voltage, and a ground reference, the capacitive digital-to-analog converter outputting an analog signal based on the binary code, the reference voltage, the monitored voltage, and the ground reference. The monitoring circuit further includes a comparator including a first input coupled to receive the analog signal and a second input coupled to the reference voltage, the comparator comparing the analog signal to the reference voltage and outputting a comparator signal based on the comparison. The monitoring circuit yet further includes a binary code generator that generates the binary code based on the comparator signal, the binary code approximating a magnitude of the monitored voltage.