Power Detector Level Hold Circuit for Voltage Drop Detection
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Solution Overview
Problem
Current power detector devices fail to accurately detect large voltage drops in power supply voltages due to reference voltage deviations, leading to operational errors in electronic systems.
Innovation Solution
A power detector device comprising a voltage generator circuit, a reference circuit, a level hold circuit, and a comparator circuit, which generates a bias voltage and detection voltage based on the power supply voltage, and selectively outputs and holds a second reference voltage to prevent errors during low-voltage detection by maintaining a stable comparison with the detection voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reference voltage is generated based on the power supply voltage, then the power detector device can operate with a simple reference voltage generation mechanism, but the reference voltage lowers or becomes deviated when the power supply voltage decreases, leading to detection errors
Solution Approach 1:
The level hold circuit performs preliminary action by capturing and holding the reference voltage level before the power supply voltage decreases. This pre-captured voltage level is then maintained during the detection process, ensuring that the comparison reference does not deviate even when the power supply voltage drops, thereby preventing detection errors while maintaining circuit simplicity
Solution Approach 2:
The level hold circuit acts as an intermediary between the reference voltage generation and the comparison process. It decouples the reference voltage from direct dependence on the power supply voltage by introducing a holding mechanism that preserves the reference level independently, thus resolving the contradiction between simple reference generation and accurate detection
2Adaptability or versatility
If the reference voltage is continuously updated based on the power supply voltage, then the reference circuit remains simple and adaptive, but the reference voltage continually stays lower than the predetermined voltage during the decreasing process, making the power detector unable to correctly determine an overly large voltage drop
Solution Approach 1:
The level hold circuit captures the reference voltage at a predetermined timing before the power supply voltage decreases significantly. This preliminary capture ensures that the reference level is established when the power supply is still stable, and then held constant during the detection process, maintaining both adaptability to normal operations and reliability during voltage drops
Solution Approach 2:
The reference voltage generation is made dynamic through the level hold circuit, which selectively updates the held voltage based on the bias voltage state. The circuit transitions from a static continuous update mode to a dynamic selective update mode, updating the reference only when appropriate (when bias voltage indicates stable power supply) and holding it constant otherwise, thus achieving both adaptability and reliability
Data Source
AI summary
A power detector device includes a voltage generator circuit, a reference circuit, a level hold circuit and a comparator circuit. The voltage generator circuit generates a bias voltage and a detection voltage according to a power supply voltage. The reference circuit generates a first reference voltage according to the power supply voltage. The level hold circuit selectively transmits the first reference voltage to a node according to the bias voltage, outputs a second reference voltage via the node, and holds a level of the second reference voltage after stopping transmitting the first reference voltage to the node. The comparator circuit compares the second reference voltage with the detection voltage to generate a power detection signal.