Zero-Crossing Detection Circuit With Energy Storage Capacitor
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Solution Overview
Problem
Current zero-crossing detection circuits in power carrier communication systems have high power consumption, leading to reduced service life and limited networked communication devices due to inaccurate detection requirements.
Innovation Solution
A zero-crossing detection circuit incorporating an energy storage capacitor with a smaller capacitance value to provide excitation current efficiently, along with a rectification circuit and optocoupler driving module, reduces power consumption and enhances detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional zero-crossing detection circuits are used to ensure detection accuracy, then detection precision is improved, but power consumption increases and service life decreases
Solution Approach 1:
The energy storage capacitor provides periodic excitation current to the photoelectric coupler only during zero-crossing detection moments rather than continuous operation. The capacitor charges during non-detection periods and discharges to provide excitation current when zero-crossing detection is needed, creating a periodic action pattern that significantly reduces overall power consumption while maintaining detection accuracy.
Solution Approach 2:
The energy storage capacitor serves dual functions: it stores energy during non-detection periods and automatically provides excitation current during detection periods without external intervention. This self-service mechanism eliminates the need for continuous power supply to the photoelectric coupler, reducing power consumption while ensuring accurate zero-crossing detection when needed.
2Measurement precision
If higher power consumption is accepted to improve zero-crossing detection accuracy, then detection precision is improved, but service life is shortened
Solution Approach 1:
By implementing periodic excitation through the energy storage capacitor rather than continuous power supply, the circuit operates in low-power mode most of the time and only activates at detection moments. This periodic operation pattern extends the service life of the circuit by minimizing energy consumption during non-critical periods while maintaining detection accuracy when required.
Solution Approach 2:
The energy storage capacitor autonomously manages power delivery to the photoelectric coupler, providing excitation current only when zero-crossing detection is needed. This self-service approach prevents unnecessary power consumption that would otherwise shorten service life, while ensuring the circuit maintains high detection accuracy during operational periods.
3Measurement precision
If continuous power supply is used to maintain detection accuracy, then measurement precision is improved, but energy efficiency decreases
Solution Approach 1:
The energy storage capacitor implements periodic excitation of the photoelectric coupler, charging during intervals when detection is not needed and discharging only during zero-crossing detection events. This periodic action eliminates continuous power consumption, dramatically improving energy efficiency while preserving detection accuracy during active measurement periods.
Solution Approach 2:
The capacitor-based power supply system autonomously manages energy delivery, providing excitation current to the photoelectric coupler only when zero-crossing detection requires it. This self-regulating mechanism eliminates wasteful continuous power consumption, improving energy efficiency without compromising the precision of zero-crossing detection when performed.
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
The solution achieves high-efficiency zero-crossing detection with low power consumption, extending the service life of the circuit and supporting more networked communication devices.
Implementation Method 1
an energy storage capacitor, connected to the zero-crossing judgment circuit in parallel, wherein the energy storage capacitor is configured to provide excitation current for the zero-crossing judgment circuit
Implementation Method 2
a photoelectric coupler, connected to the zero-crossing judgment module
Data Source
AI summary
The present disclosure discloses a zero-crossing detection circuit, including: a zero-crossing judgment circuit, configured to detect a zero-crossing signal; and an energy storage capacitor, connected to the zero-crossing judgment circuit in parallel, wherein the energy storage capacitor is configured to provide excitation current for the zero-crossing judgment circuit.