Voltage Sensing Device Multiplexer Switched Capacitor Amplifier
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Solution Overview
Problem
Conventional battery monitoring systems require separate sensing circuits for voltage and current, leading to increased circuit scale and manufacturing costs, while also limiting accuracy due to differing sampling cycles for voltage and current sensing.
Innovation Solution
A voltage sensing device that switches between voltage and current sensing modes using a multiplexer and differential switched capacitor amplifier circuit with switchable gains, allowing shared signal processing paths and synchronized sampling cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensing circuits are used for voltage sensing and current sensing, then the sensing accuracy is maintained, but the circuit scale and manufacturing cost increase
Solution Approach 1:
The patent combines voltage sensing and current sensing functions into a single sensing circuit by using a multiplexer to selectively connect either voltage sensing target nodes or shunt resistor terminals to the differential switched capacitor amplifier circuit. This merging approach reduces circuit scale and manufacturing cost while maintaining sensing accuracy through synchronized sampling of both voltage and current.
Solution Approach 2:
The sensing circuit is designed with multi-functionality to perform both voltage sensing and current sensing operations. The differential switched capacitor amplifier circuit can operate in different modes (voltage sensing mode and current sensing mode) by controlling the multiplexer and switch connections, allowing one circuit to serve multiple purposes without sacrificing measurement precision.
2Device complexity
If the same sensing circuit is used for both voltage sensing and current sensing, then the circuit scale is reduced, but the sensing speeds differ and sampling cannot be synchronized
Solution Approach 1:
The patent introduces dynamic control elements (multiplexer and switches) that allow the sensing circuit to adapt its configuration based on the sensing mode required. The operation control unit dynamically controls the multiplexer and switch connections to ensure that both voltage and current are sampled at the same timing, synchronizing the sampling cycles while using a single shared circuit.
Solution Approach 2:
The circuit incorporates feedback control through the operation control unit that monitors and coordinates the sampling operations. By controlling the multiplexer and switch timing, the system ensures synchronized sampling of voltage and current, providing feedback control over the sampling process to maintain measurement accuracy.
3Use of energy by moving object
If a shunt resistor with small resistance value is used to suppress consumption current, then the consumption current is reduced, but the terminal voltage becomes too small requiring a dedicated amplifier
Solution Approach 1:
The patent merges the amplifier function into a shared differential switched capacitor amplifier circuit that serves both voltage sensing and current sensing. By using this shared amplifier with configurable gain through switch control, the system can amplify the small terminal voltage from the low-resistance shunt resistor without requiring a separate dedicated amplifier, thus reducing consumption current while avoiding increased circuit scale.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables high-precision sensing across the dynamic range of inputs without increasing circuit scale, reducing errors and power consumption, and improving accuracy for signal processing tasks like SOC estimation.
Implementation Method 1
a differential switched capacitor amplifier circuit that includes a sampling capacitor and a feedback capacitor, and that is configured to execute a sampling operation of sampling the first output voltage and the second output voltage through the sampling capacitor, and output sensing voltages corresponding to the first output voltage and the second output voltage by transferring a charge, which is stored in the sampling capacitor, through the feedback capacitor
Data Source
AI summary
A voltage sensing device includes: a multiplexer configured to choose either two corresponding voltages at two voltage sensing target nodes or two corresponding voltages at the terminals of a shunt resistor, and output either the two corresponding voltages at the two voltage sensing target nodes or the two corresponding voltages at the terminals of the shunt resistor, which are chosen by the multiplexer, as a first output voltage and a second output voltage; a differential switched capacitor amplifier circuit including a sampling capacitor and a feedback capacitor and configured to sample the first output voltage and the second output voltage through the sampling capacitor, and output sensing voltages corresponding to the first output voltage and the second output voltage by transferring a charge stored in the sampling capacitor through the feedback capacitor; and an operation control unit configured to control the multiplexer and the differential switched capacitor amplifier circuit.