Bridgeless PFC Circuit With Integrated Surge Break and Metering
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Solution Overview
Problem
Conventional bridgeless power factor correction (PFC) circuits require multiple sets of sampling and control circuits to implement functions like lightning quick-break protection, low frequency switch control, and current metering, leading to a large occupied area on printed circuit boards (PCBs).
Innovation Solution
A power control circuit that integrates an alternating current power supply module, a power module with a bridgeless PFC circuit, and a control module, which includes a sampling apparatus and a control module to sample current signals, control switch elements, and perform lightning quick-break protection and current metering, reducing the need for multiple circuits and thus the occupied area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sets of sampling and control circuits are used to implement lightning quick-break protection, low frequency switch control, and current metering functions, then the functional completeness and reliability are improved, but the occupied area on PCB increases
Solution Approach 1:
The patent merges multiple independent sampling and control circuits into a single integrated control circuit. The control circuit includes a sampling module that samples current signals, a processing module that processes the sampled signals to detect lightning surges and perform current metering, and a control module that controls switch elements. This consolidation integrates functions that were previously implemented by separate circuits, thereby reducing PCB occupied area while maintaining functional completeness and reliability.
Solution Approach 2:
The integrated control circuit is designed to perform multiple functions simultaneously: lightning quick-break protection, low frequency switch control, and current metering. The sampling module samples current signals that can be used for all three functions, and the processing module analyzes these signals to provide control signals for switch elements and metering information. This multi-functional design eliminates the need for separate dedicated circuits for each function, reducing overall circuit complexity and PCB area.
2Adaptability or versatility
If multiple sets of circuits with corresponding components are used to achieve multiple functions synchronously, then the system functionality is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple independent circuits into a single integrated control circuit that handles lightning protection, switch control, and current metering functions. By merging these functions into one circuit architecture with shared sampling and processing components, the overall device complexity is reduced while maintaining the ability to perform all required functions synchronously.
Solution Approach 2:
The control circuit is designed as a universal multi-functional unit where the sampling module, processing module, and control module work together to accomplish multiple tasks. The same sampled current signals are processed to provide lightning surge detection, switch control signals, and metering data, eliminating the need for separate dedicated circuits and reducing overall system complexity.
Data Source
AI summary
A power control circuit includes an alternating current power supply module, a power module, and a controller. The power module includes a bridgeless power factor correction circuit. A sampling apparatus in the alternating current power supply module samples a current signal output by an alternating current power supply or the power module, and outputs an obtained sampled signal to the controller. The controller controls on and off of a switch element in the alternating current power supply module based on the received sampled signal, and the controller switches off the switch element when the sampled signal includes a lightning surge signal. In addition, the controller is further configured to perform current metering on the sampled signal.