HVIL Switch Connector Locking for Load-Free High-Voltage Disconnection
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Solution Overview
Problem
Existing high voltage inter-lock systems require voltage control at the plug side, limiting compatibility with other plug systems and occupying contacts permanently, thus restricting their use.
Innovation Solution
A switch device with a locking lever and elastic unit ensures that a low-voltage detection circuit action precedes high voltage circuit disconnection, using a movable contact and elastic unit to maintain electrical conduction or disconnection based on the lever's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage control is implemented at the plug side of a specific contact, then high voltage inter-lock function is achieved, but compatibility with other plug systems is limited and contacts are permanently occupied
Solution Approach 1:
The control contact establishes electrical connection and activates the control voltage before the high voltage contact makes connection. This preliminary action ensures that the inter-lock system is activated in advance, allowing the plug system to maintain reliability while enabling sequential connection that improves compatibility by separating control signaling from power transmission timing
Solution Approach 2:
The contact structure is segmented into distinct control contacts and high voltage contacts that operate independently in sequence. The control contact handles low-voltage signaling while the high voltage contact handles power transmission, allowing each contact type to be optimized for its specific function and improving overall system versatility
2Speed
If the movable contact disconnects the low-voltage detection circuit before the high voltage circuit, then disconnection speed is improved, but safety is compromised due to potential sparks
Solution Approach 1:
The movable contact sequentially disconnects the low-voltage detection circuit first, then disconnects the high voltage circuit afterward. This preliminary disconnection of the control circuit before breaking the power circuit allows the system to prepare for disconnection safely, eliminating sparks by ensuring control signals are terminated before high voltage interruption occurs
Solution Approach 2:
The sequential disconnection mechanism provides beforehand cushioning by first opening the low-voltage circuit path, which prepares the control system to manage the subsequent high voltage disconnection safely, preventing harmful arc discharge through proper sequencing of electrical path interruptions
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
Ensures reliable load-free disconnection and prevents malfunctions like sparks by ensuring the high voltage circuit remains disconnected until the low-voltage detection is complete, enhancing safety and compatibility.
Implementation Method 1
the elastic unit is in a compressed state, and the movable contact is in contact with a low-voltage detect contact of the switch device; and when the locking lever is pivoted to an unlocked position, the pressing unit moves to a second position in a linked manner, and the elastic unit is in an extended state, and the movable contact is separated from the low-voltage detect signal contact
Data Source
AI summary
A switch device for a hazardous voltage interlockloop has a first connector, provided at an input end of the hazardous voltage interlockloop; and a second connector, provided at an output end of the hazardous voltage interlockloop. The second connector is capable of being fitted to the first connector; the first connector has a locking lever, the locking lever being pivotably provided on a housing of the first connector, the second connector has a pressing unit, a movable contact, and an elastic unit. When the first connector and the second connector are in a fitted state, the locking lever abuts against the pressing unit. When the locking lever is pivoted to a locked position, the pressing unit moves to a first position in a linked manner, and the pressing unit enables the elastic unit to be in a compressed state, and the movable contact is in contact with a low-voltage detect contact of the switch device. When the locking lever is pivoted to an unlocked position, the pressing unit moves to a second position in a linked manner, and the elastic unit is in an extended state, and the movable contact is separated from the low-voltage detect signal contact.