Integrated Protection Circuit for Bus Capacitor Voltage Control
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Solution Overview
Problem
Conventional power devices require numerous power components for overvoltage and overcurrent protection, leading to complex wiring and high costs, while also needing additional safety measures for voltage and electromagnetic interference.
Innovation Solution
A power device with a protection circuit that integrates and multiplexes power components to provide overvoltage protection, suppress surge currents, and regulate bus capacitor voltage using a protection switch, diodes, and resistors, reducing the number of power components and complexity while maintaining effective voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protection circuits are used with multiple power components, then overvoltage and overcurrent protection can be achieved, but the wiring becomes complicated and cost increases
Solution Approach 1:
The patent combines multiple protection functions (overvoltage protection, overcurrent protection, surge suppression) into a single integrated protection circuit. The protection circuit uses a limited number of components (resistor R1, capacitor C1, diode D1, and protection element PE) to achieve multiple protection functions simultaneously, eliminating the need for separate protection circuits for each function and reducing overall wiring complexity.
Solution Approach 2:
The protection circuit is designed with multi-functionality, where the same circuit components serve multiple protection purposes. For example, the protection element PE provides both overvoltage protection and overcurrent protection, while capacitor C1 serves both as a surge suppression element and as part of the voltage detection circuit. This universal approach reduces the total number of components and simplifies the overall system.
2Reliability
If additional protection circuits are added to power devices, then safety protection against voltage interference and electromagnetic interference is improved, but the number of power components increases and cost rises
Solution Approach 1:
The patent merges protection against different types of interference (voltage interference, electromagnetic interference, surge currents) into a single protection circuit design. The protection element PE and associated components (R1, C1, D1) work together to provide comprehensive protection against multiple interference types, eliminating the need for separate protection circuits for each interference type.
Solution Approach 2:
The protection circuit is designed with universal protection capabilities that handle multiple threat types. The voltage detection mechanism monitors bus bar voltage and triggers appropriate protection responses for various interference conditions (overvoltage, surge, electromagnetic interference) using the same core components, thereby reducing the total quantity of power components needed.
3Reliability
If conventional protection circuits with many power components are used, then comprehensive protection is achieved, but the power density of the power device decreases
Solution Approach 1:
The patent combines multiple protection functions into a compact integrated circuit that occupies minimal space. By merging overvoltage protection, overcurrent protection, and surge suppression into a single circuit location near the power input, the design maintains comprehensive protection while minimizing the space consumed by protection components, thereby preserving high power density.
Solution Approach 2:
The patent extracts the essential protection functions from complex conventional circuits and implements them using a minimal set of core components. By taking out only the necessary elements (protection element PE, resistor R1, capacitor C1, diode D1) and eliminating redundant components, the design achieves comprehensive protection with minimal component count, maintaining high power density.
Data Source
AI summary
A power device with a protection circuit is provided. The power device includes a power module, a power output terminal, a converter module, a bus capacitor, and a protection circuit. The power module receives an input power. The converter module, the protection circuit, and the bus capacitor is electrically connected between the power module and the power output terminal. The protection circuit is configured for overvoltage protection when the input power being overvoltage, suppressing the surge current when booting up the power device, and regulating the voltage on the bus capacitor under overvoltage and undervoltage conditions.