Adaptive Voltage Detection Circuit for Power-On Overvoltage Protection
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Solution Overview
Problem
Existing voltage detection systems require multiple voltage divider circuits and comparators to determine circuit configurations for different voltage levels, leading to increased circuit area and cost, and lack effective over-voltage protection during power-on.
Innovation Solution
A voltage detection device comprising a voltage divider circuit, comparator circuit, and switch control circuit that automatically detects a target power voltage level during power-on, switching to an appropriate mode after a predetermined period, using one voltage divider and comparator to prevent over-voltage damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple voltage divider circuits and comparators are used to detect different voltage levels, then voltage detection accuracy is improved, but circuit area and cost increase
Solution Approach 1:
The patent combines multiple voltage divider circuits and comparators into a single integrated voltage detection circuit that can detect multiple voltage levels. The voltage detection circuit includes a voltage divider circuit with switchable resistance values and a comparator that can identify different voltage levels (e.g., 3.3V, 1.8V, 1.2V) using one set of components, thereby reducing circuit area while maintaining detection accuracy.
Solution Approach 2:
The patent employs dynamic switching of resistance values in the voltage divider circuit based on detected voltage levels. The resistance switching mechanism allows the same voltage divider circuit to adapt its division ratio dynamically, enabling accurate detection of different voltage levels without requiring multiple static voltage divider circuits, thus reducing overall circuit area.
2Measurement precision
If multiple voltage divider circuits and comparators are used to determine circuit configurations, then voltage level detection is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple voltage detection functions into a single integrated circuit that determines both voltage levels and corresponding circuit configurations. The voltage detection circuit simultaneously identifies voltage levels (3.3V, 1.8V, 1.2V) and triggers appropriate configuration changes in the I/O interface circuit, eliminating the need for separate detection and control circuits.
Solution Approach 2:
The voltage detection circuit serves multiple functions: it detects different voltage levels, determines appropriate circuit configurations, and controls switching between configurations. This multi-functional design reduces device complexity by consolidating what would traditionally require separate circuits into a single integrated solution.
3Ease of operation
If traditional voltage detection is used without timing control, then circuit configuration switching is simple, but over-voltage protection during power-on is insufficient
Solution Approach 1:
The patent implements preliminary action by maintaining the voltage divider circuit in a first mode (corresponding to a first target voltage level) during the power-on period before switching to the second mode. This ensures that the circuit is configured for higher voltage tolerance during the vulnerable power-on phase, providing over-voltage protection before the actual voltage level is detected and configuration switching occurs.
Solution Approach 2:
The patent uses feedback from the voltage detection circuit to control the switching between different operating modes. The comparator continuously monitors the input voltage and provides feedback to the control circuit, which then switches the voltage divider circuit between first and second modes based on the detected voltage level, ensuring reliable operation and protection.
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
Ensures circuit configurations adapt to actual voltage levels during power-on, preventing transistor damage and reducing circuit complexity and cost by using timing control to switch to appropriate modes post-power-on.
Implementation Method 1
The voltage divider circuit operates in a first mode based on a switching signal and divides a power voltage to generate an input voltage
Implementation Method 2
The comparator circuit compares the input voltage with a set of reference voltages to generate a detection signal
Data Source
AI summary
A voltage detection device includes a voltage divider circuit, a comparator circuit and a switch control circuit. The voltage divider circuit operates in a first mode based on a switching signal and divides a power voltage to generate an input voltage. The comparator circuit compares the input voltage with a set of reference voltages to generate a detection signal. The switch control circuit selectively adjusts a switching signal according to the detection signal after a predetermined period has elapsed from power-on of the power voltage so as to control the voltage divider circuit to switch from operating in the first mode to operating in a second mode. The first mode corresponds to a first target level of the power voltage, the second mode corresponds to a second target level of the power voltage, and the first target level is higher than the second target level.