Single Fire-Wire AC Power Fetching Module with Synchronous Rectification
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Solution Overview
Problem
Conventional power fetching circuits for AC power supply lack synchronous functionality, leading to inefficient power delivery, frequent battery replacements, and increased Electromagnetic Interference (EMI) noise, which are not cost-effective and environmentally friendly.
Innovation Solution
A single fire-wire phase-front dynamic AC power fetching module with two series-connected synchronous power fetching circuits and an electronic switch, utilizing a bi-directional dynamic full-bridge type design to perform AC power fetching twice in a cycle, reducing EMI noise and eliminating the need for battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional half-wave power fetching is used, then the circuit can be connected to local power supply, but it cannot provide sufficient power for wireless communication modules and sensors, requiring battery power
Solution Approach 1:
The patent implements full-wave power fetching by performing power fetching twice in each AC cycle (both positive and negative half-cycles), whereas conventional methods only fetch power during one half-cycle. This periodic action on both halves of the AC waveform doubles the power fetching capability, providing sufficient power for wireless communication modules and sensors without requiring battery supplementation
Solution Approach 2:
The patent combines two series-connected synchronous power fetching circuits to handle both positive and negative phases of the AC cycle simultaneously. By merging these circuits and coordinating their operation, the system achieves full-wave power fetching that provides adequate power for all IoT devices including Wi-Fi modules and sensors, eliminating the need for separate battery power sources
2Power
If conventional single fire-wire AC power fetching using TRIAC delayed connection-and-disconnection is used, then power fetching can be achieved, but greater Electromagnetic Interference (EMI) noise is produced
Solution Approach 1:
The patent replaces the conventional TRIAC-based mechanical switching system with an electronic switch controlled by synchronous rectification and zero-crossing detection. This substitution eliminates the abrupt connection-and-disconnection actions that generate EMI noise, as the electronic switching occurs smoothly at zero-crossing points of the AC waveform, significantly reducing electromagnetic interference while maintaining full-wave power fetching capability
Solution Approach 2:
The patent introduces a synchronous rectifier and zero-crossing control unit as intermediary components between the AC power source and the load. These intermediaries coordinate the switching actions to occur at optimal moments (zero-crossing points), mediating the power transfer to minimize EMI noise generation while ensuring efficient full-wave power fetching
3Power
If battery power is used to supplement power fetching, then sufficient power can be provided for wireless modules and sensors, but battery replacement is required frequently causing pollution
Solution Approach 1:
The patent enables the power fetching circuit to serve itself by implementing full-wave synchronous rectification that automatically adjusts to load requirements. The system fetches sufficient power directly from the AC mains during both positive and negative half-cycles, providing adequate power for wireless communication modules and sensors without requiring external battery supplementation, thereby eliminating battery replacement needs and associated pollution
Solution Approach 2:
The patent achieves continuous power fetching throughout the entire AC cycle by utilizing both positive and negative half-cycles, ensuring uninterrupted and sufficient power delivery to all connected devices. This continuous useful action eliminates the power gaps that would otherwise require battery supplementation, providing sustained power without the environmental harm of battery disposal
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 provides stable DC power for Wi-Fi and sensor operations, reduces battery pollution, and decreases EMI noise, achieving high efficiency and cost savings by eliminating the need for battery power and additional wiring.
Implementation Method 1
a positive phase synchronous rectifier circuit and a negative phase synchronous rectifier circuit
Implementation Method 2
an electronic switch connected thereto. Wherein, one series-connected type synchronous power fetching circuit is used to perform positive phase AC power fetching, while the other series-connected type synchronous power fetching circuit is used to perform negative phase AC power fetching
Data Source
AI summary
A single fire-wire phase-front dynamic AC power fetching module, comprising: two series-connected type synchronous power fetching circuits connected in parallel, and an electronic switch connected thereto, one series-connected type synchronous power fetching circuit is used to perform positive phase AC power fetching, while the other series-connected type synchronous power fetching circuit is used to perform negative phase AC power fetching. The electronic switch is formed by a relay or a silicon control crystal (TRIAC) controlled by an MCU microprocessor. As such, through adopting bi-directional dynamic full-bridge type power fetching, for a single fire wire, it is able to perform power fetching twice in a cycle. The duration of power fetching can be regulated automatically depending on the load, to compensate for the power, and supply it to an outside circuit as the basic power supply.