Voltage Detector for AC Hold Time Extension
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Solution Overview
Problem
Existing electronic apparatuses face challenges in maintaining a stable power supply during input alternating current voltage cutoffs, as they require large filter capacitors and Power Factor Correction converters that increase circuit size and cost, aiming to prolong hold time without these solutions.
Innovation Solution
A voltage detector comprising a rectifying and filtering circuit, a comparison circuit, and a detection signal generator with isolated sides, which processes alternating current input voltage, compares it to a reference voltage, and generates a detection signal to adjust power demand, enabling load shedding and redundant power switching without the need for a Power Factor Correction converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a Power Factor Correction converter is used to prolong hold time, then the hold time is extended, but the circuit area and cost increase substantially
Solution Approach 1:
The patent extracts the voltage detection and power demand adjustment functions from the complex PFC converter system. By using a simple voltage detector to monitor input voltage and control the load device to adjust power demand, the system achieves hold time extension without requiring the bulky PFC converter circuitry, thus reducing circuit area while maintaining the desired hold time performance
Solution Approach 2:
The patent implements a feedback mechanism where the voltage detector continuously monitors the input alternating current voltage and generates detection signals that feed back to control the load device's power demand. This closed-loop feedback system enables dynamic power management that prolongs hold time without needing additional complex hardware like PFC converters
2Duration of action of moving object
If a Power Factor Correction converter is used to prolong hold time, then the hold time is extended, but the cost of the electronic apparatus increases substantially
Solution Approach 1:
The patent replaces the expensive PFC converter with a cost-effective voltage detector and load device control system. The voltage detector uses simple rectifying and filtering circuits along with a detection signal generator that can be implemented with inexpensive components, significantly reducing the overall apparatus cost while achieving the same hold time extension function
Solution Approach 2:
The patent extracts only the essential voltage detection and power control functions needed to prolong hold time, eliminating the need for expensive PFC converter components. This selective extraction of necessary functions reduces manufacturing cost while maintaining the core functionality of extending hold time during input voltage cutoff
3Duration of action of moving object
If a large filter capacitor is used to maintain stable power supply during voltage cutoff, then the hold time is extended, but the circuit area increases
Solution Approach 1:
The patent uses a feedback-based power demand adjustment mechanism where the voltage detector monitors input voltage conditions and controls the load device to reduce power consumption during voltage cutoff. This active power management approach extends hold time without requiring large filter capacitors, thereby avoiding the associated increase in circuit area
Solution Approach 2:
The patent implements dynamic power demand adjustment where the load device modifies its power consumption based on real-time voltage detection. This dynamic adaptation allows the system to prolong hold time through intelligent power management rather than relying on static large-capacitance filtering, reducing the required circuit area
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 solution effectively prolongs the hold time of the power supply by accurately detecting alternating current input voltage states and adjusting power demand, reducing the need for large filter capacitors and Power Factor Correction converters, thus minimizing circuit size and cost while maintaining stable operation.
Implementation Method 1
The rectifying and filtering circuit receives an alternating current input voltage and performs a rectifying and filtering operation on the alternating current input voltage to generate a processed voltage
Implementation Method 2
The rectifying and filtering circuit receives an alternating current input voltage and performs a rectifying and filtering operation on the alternating current input voltage to generate a processed voltage
Implementation Method 3
The comparison circuit is coupled to the rectifying and filtering circuit, and compares the processed voltage with a reference voltage to generate a comparison signal
Implementation Method 4
The first side generates an induction signal according to the comparison signal
Data Source
AI summary
An electronic apparatus, a voltage detector, and a voltage detection method thereof are provided. The voltage detector includes a rectifying and filtering circuit, a comparison circuit, and a detection signal generator. The rectifying and filtering circuit receives an alternating current input voltage and performs a rectifying and filtering operation on the alternating current input voltage to generate a processed voltage. The comparison circuit compares the processed voltage with a reference voltage to generate a comparison signal. The detection signal generator has a first side and a second side. The first side receives the comparison signal and generates an induction signal according to the comparison signal. The second side receives the indication signal to generate a detection signal. The first side and the second side are isolated.