Battery Voltage Measurement Circuit with Dynamic Power Mode
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Solution Overview
Problem
Existing electronic devices powered by secondary batteries face challenges in measuring remaining battery levels with low power consumption, as current techniques for excessive discharge detection and voltage measurement consume more power than necessary.
Innovation Solution
A circuit device with a measurement circuit, interface circuit, and control circuit that uses a counter to set a voltage division ratio for battery voltage measurement, compares the output voltage with a reference voltage, and performs battery protection control, reducing power consumption by stopping measurement operations when the power supply is off and using a fixed count value for excessive discharge detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage measurement is performed with multiple levels to measure remaining battery amount, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the measurement circuit operational state configurable. The circuit dynamically switches between two modes: (1) multiple-level voltage measurement mode when the electronic device is operating to measure remaining battery amount with high precision, and (2) excessive discharge detection mode when the device is powered off to conserve power. This dynamic adaptation resolves the contradiction by adjusting measurement precision according to operational requirements.
Solution Approach 2:
The patent changes the operational parameters of the measurement circuit based on power supply state. When power supply is off, the circuit performs only excessive discharge detection using a simplified comparison operation. When power supply is on, the circuit performs multi-level voltage measurement for remaining battery amount. This parameter change approach allows the system to achieve high measurement precision when needed while minimizing power consumption during idle periods.
2Reliability
If excessive discharge detection is performed by comparing battery voltage with detection voltage, then reliability is improved, but power consumption increases compared to fixed threshold detection
Solution Approach 1:
The patent applies partial action by implementing a two-tier detection mechanism. The first tier uses a simple voltage comparison operation for excessive discharge detection, which consumes minimal power. The second tier uses multi-level measurement for remaining battery amount, which provides higher precision but consumes more power. By activating only the necessary tier based on operational state, the system achieves reliable excessive discharge detection without the continuous power consumption of full multi-level measurement.
Solution Approach 2:
The patent extracts the essential function of excessive discharge detection from the more complex remaining battery amount measurement function. When power supply is off, the system performs only the minimal necessary operation (excessive discharge detection via voltage comparison) and suspends the more power-intensive multi-level measurement function. This extraction allows the system to maintain detection reliability while minimizing power consumption during idle periods.
3Measurement precision
If counter operates continuously to enable remaining battery amount measurement, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by controlling the counter to operate only during specific periods when power supply is on and remaining battery amount measurement is required. When power supply is off, the counter enters a low-power state and performs only excessive discharge detection. This periodic activation pattern allows the system to achieve high measurement precision when needed while significantly reducing counter power consumption during idle periods.
Solution Approach 2:
The patent makes the counter's operational state dynamic based on power supply conditions. The counter transitions between an active counting state (when power is on and measurement is needed) and a low-power fixed-value state (when power is off). This dynamic behavior allows the system to maintain measurement precision capability when required while minimizing power consumption during idle periods, effectively resolving the contradiction between precision and power usage.
Data Source
AI summary
Provided are a circuit device, a control device, a power receiving device, an electronic device, and the like that realize measurement of a remaining battery amount and excessive discharge detection with low power consumption, and can reduce power consumption from a battery. The circuit device includes a measurement circuit that measures a battery voltage, an interface circuit that outputs battery voltage information to a processing device, and a control circuit. The measurement circuit has a counter, a resistance circuit that divides the battery voltage by a voltage division ratio set by a count value of the counter, and a comparator that compares an output voltage of the resistance circuit with a reference voltage. When power supply to the processing device is off, the counter sets the count value to a fixed value, and the control circuit performs battery protection control processing based on the comparison result of the comparator.