Surge Protection Circuit With Intermediary Buffer Device
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Solution Overview
Problem
Traditional surge protection circuits for communication power supplies, especially in mobile communication base stations, face challenges in effectively managing lightning surges due to large capacitor requirements, which increase size and volume, and existing solutions do not efficiently absorb surge currents without affecting the main topology circuit.
Innovation Solution
A surge protection circuit incorporating a bridgeless boost sub-circuit and a surge protection sub-circuit with a surge buffer device, such as a capacitor and resistance in parallel, or a piezoresistor, that absorbs surge current without being part of the main topology, allowing for smaller capacity and volume, and utilizing N channel MOS tubes, diodes, or IGBTs with damping diodes for efficient surge management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large capacity capacitor is used to absorb surge current, then the surge protection effect is improved, but the volume and size of the circuit increase
Solution Approach 1:
The patent introduces a surge buffer device as an intermediary component between the power source and the bridgeless boost circuit. This surge buffer device acts as a mediator that absorbs surge currents before they reach the main circuit, protecting the system without requiring large capacity capacitors in the main topology. The surge buffer device includes a capacitor and resistance in parallel, or a piezoresistor, which provides surge absorption functionality while maintaining compact size.
2Reliability
If the surge buffer device is integrated into the main topology circuit, then the surge protection is improved, but the complexity of the circuit increases
Solution Approach 1:
The patent divides the circuit into two independent segments: the bridgeless boost sub-circuit for normal power conversion and the surge protection sub-circuit for surge absorption. The surge buffer device is placed in the surge protection sub-circuit, which is electrically connected but functionally separate from the main topology. This segmentation allows the surge protection function to be added without complicating the main bridgeless boost circuit design.
3Reliability
If traditional surge protection circuits are used, then the surge current absorption is improved, but the load on the boost diode and switching tube increases
Solution Approach 1:
The surge buffer device serves as an intermediary that intercepts and absorbs surge currents before they can flow through the boost diode and switching tube in the bridgeless boost circuit. By placing the surge buffer device at the input stage, the patent creates a protective barrier that prevents surge energy from reaching the main switching components, thereby reducing their load and preventing energy loss through these components during surge events.
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 proposed solution effectively absorbs surge currents with a smaller capacitor and reduced volume, protecting devices from surge damage by diverting energy through the surge buffer device, thereby reducing the load on the boost diode and switching tube in the bridgeless boost sub-circuit.
Implementation Method 1
a surge buffer device, such as a capacitor and resistance in parallel
Implementation Method 2
a surge buffer device, such as a capacitor and resistance in parallel
Implementation Method 3
or a piezoresistor
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A surge protection circuit comprises a bridgeless boost sub-circuit and a surge protection sub-circuit. Wherein, the bridgeless boost sub-circuit comprises a first connection end and a second connection end of an alternating current power source, an inductor 1, an inductor 2, a switching tube 1 with a damping diode, a switching tube 2 with a damping diode, a capacitor 1, a diode 5, and a diode 6. The surge protection sub-circuit comprises a first connection end and a second connection end of an alternating current power source, a diode 1, a diode 2, a transistor 3, a transistor 4, and a surge buffer device. The embodiment of the present invention provides a new solution for the surge protection, wherein, a surge buffer device is used to absorb a surge current, and the surge buffer device is not in a main topology circuit.