Solid-State Circuit Breaker Reverse Wiring Trip Protection
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Solution Overview
Problem
In DC microgrids with solid-state circuit breakers, reverse wiring can cause damage due to reverse voltage, leading to potential breakdown and safety hazards, which existing technologies have not adequately addressed.
Innovation Solution
A reverse wiring self-protection circuit for solid-state circuit breakers that includes an auxiliary power module to provide tripping energy, a reverse wiring determination module to detect reverse connections, and a driving circuit module to trip the circuit before closing, using rectifiers and voltage detection units to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reverse wiring protection is not implemented, then the circuit breaker can operate normally under correct wiring conditions, but the circuit breaker may be damaged by reverse voltage under wrong wiring conditions
Solution Approach 1:
The patent applies preliminary action by detecting reverse wiring conditions before the circuit breaker closes and trips the circuit in advance. The reverse wiring determination module detects abnormal voltage conditions before closure, and the driving circuit module triggers the tripping coil to open the isolating switch beforehand, preventing damage from reverse voltage while maintaining normal operation under correct wiring conditions.
2Object-affected harmful factors
If reverse wiring detection is added, then damage from reverse wiring is prevented, but the device complexity increases
Solution Approach 1:
The patent applies universality by integrating reverse wiring detection functionality into the existing control circuit of the circuit breaker. The reverse wiring determination module shares the control power supply and integrates with the driving circuit module that already exists for normal operation control, allowing the same control system to perform both normal switching and reverse wiring protection functions without adding completely separate detection equipment.
Solution Approach 2:
The patent applies self-service by using the circuit breaker's own power system to detect reverse wiring conditions. The reverse wiring determination module obtains detection power from the existing control power supply, and the system uses its internal voltage detection capabilities to identify reverse wiring without requiring external detection devices, making the protection function self-contained within the circuit breaker itself.
3Reliability
If tripping is performed before closure, then safety is improved, but the operation time increases
Solution Approach 1:
The patent applies skipping by rapidly detecting reverse wiring conditions and immediately tripping the circuit before the closing operation completes. The reverse wiring determination module quickly identifies abnormal voltage conditions, and the driving circuit module promptly activates the tripping coil to open the isolating switch, rushing through the protection action in minimal time to prevent damage while maintaining safety.
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 effectively protects the circuit breaker and enhances safety by detecting and preventing reverse wiring before closing, thereby safeguarding the solid-state circuit breaker and the connected DC system.
Implementation Method 1
a rectifier configured to rectify the DC power and provide the rectified voltage to an auxiliary power circuit
Data Source
AI summary
A reverse wiring self-protection circuit is disclosed, including an auxiliary power module configured to provide tripping electric energy for tripping the solid-state circuit breaker to a tripping coil of the solid-state circuit breaker before an isolating switch of the solid-state circuit breaker is closed; a reverse wiring determination module configured to determine whether DC power connected to the solid-state circuit breaker is reversely wired, and output a first driving enable signal enabling a driving circuit module in response to reverse wiring of the DC power; the driving circuit module is configured to, transmit a driving signal indicating tripping operation to the tripping coil, in response to the first driving enable signal. The reverse wiring self-protection circuit according to the present disclosure can protect the elements included in the solid-state circuit breaker itself and improve the personal safety of the DC system to which the solid-state circuit breaker is connected.