Voltage Detection Enabling Circuit for Stable UVLO Startup
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Solution Overview
Problem
Existing under voltage lockout (UVLO) circuits may incorrectly determine the stability of the driving voltage, leading to erroneous operations and potential circuit damage due to unstable power supply conditions, especially during the initial startup when the rising speed of the driving voltage varies.
Innovation Solution
A voltage detection enabling circuit that includes a reference voltage generating unit, an enabling protection unit, and an enabling judgment unit, where the enabling protection unit uses a transistor parameter to determine whether to enable the electronic circuit based on a reference voltage signal higher than a voltage parameter, thereby avoiding incorrect judgments and ensuring stable power conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a delay signal is used to postpone the enabling judgment, then the reference voltage stability is improved, but the response time of the voltage detection is increased
Solution Approach 1:
The patent applies preliminary action by detecting the startup state of the reference voltage generating unit before making the enabling judgment. The voltage detection enabling circuit checks whether the reference voltage generating unit has completed its startup process (by monitoring transistor conduction state) before allowing the UVLO comparison to proceed. This ensures the reference voltage is stable before comparison without adding arbitrary delay time, thus resolving the contradiction between reliability and response time.
2Productivity
If the enabling judgment is made early to reduce response time, then the productivity is improved, but the measurement precision of voltage stability is degraded
Solution Approach 1:
The circuit performs preliminary detection of the reference voltage generating unit's startup completion before enabling the voltage comparison function. By checking the transistor conduction state in advance, the system ensures measurement precision is not compromised while minimizing delay, thus improving productivity without sacrificing accuracy.
Solution Approach 2:
The voltage detection enabling circuit uses the internal state of the reference voltage generating unit itself (transistor conduction state) as the criterion for enabling comparison. This self-service approach eliminates the need for external delay circuits or arbitrary timing, allowing the system to automatically determine when the reference voltage is ready, thus improving both productivity and precision.
3Reliability
If a fixed delay time is applied to ensure reference voltage stability, then the reliability is improved, but the adaptability to different power supply conditions is reduced
Solution Approach 1:
The patent replaces the fixed delay time with a dynamic detection mechanism that monitors the actual startup state of the reference voltage generating unit. The enabling judgment is made based on the real-time conduction state of the transistor, which automatically adapts to different power supply rising speeds. This dynamic approach maintains reliability while improving adaptability to various operating conditions.
Solution Approach 2:
The circuit changes the parameter used for enabling judgment from a fixed time delay to a voltage-dependent transistor conduction state. This parameter change allows the system to automatically adjust to different power supply conditions and rising speeds, thus improving adaptability while maintaining comparison accuracy through the inherent stability of the transistor's conduction threshold.
Data Source
AI summary
A voltage detection enabling circuit is disclosed. The voltage detection enabling circuit includes a reference voltage generating unit, an enabling protection unit, and an enabling judgment unit. The reference voltage generating unit is coupled to a driving voltage, and generates a reference voltage signal. The enabling protection unit receives the reference voltage signal and outputs an enabling judgment signal when the reference voltage signal is higher than a voltage parameter. Particularly, the voltage parameter is a component parameter of an electronic component. Then the enabling judgment unit determines whether an enabling signal is generated or not according to the enabling judgment signal and the driving voltage.