Pulsed Startup Power Distribution for Safe Remote Subunit Charging
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Solution Overview
Problem
In multi-unit power distribution networks, there is a challenge in safely powering remote subunits while preventing human contact with power conductors, particularly during the initial power-up phase, as existing solutions may trigger false alarms or fail to ensure safe current levels.
Innovation Solution
The system selectively disconnects and reconnects remote subunits from power conductors at a low frequency, providing short current pulses with a low duty cycle to charge power conditioning elements, allowing synchronization with the power source and using circuitry to detect unwanted loads on the conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous power is delivered to remote subunits during start-up, then power conditioning elements can be charged, but false alarms may be triggered by human contact detection systems
Solution Approach 1:
The patent implements periodic disconnection and reconnection of remote subunits from power conductors during start-up, creating pulsed power delivery. This periodic action allows power conditioning elements to charge during connected phases while creating current dips during disconnected phases that prevent human contact detection false alarms, as the detection system expects continuous load patterns.
Solution Approach 2:
The system performs preliminary synchronization between the remote subunit's switching frequency and the power source's human contact detection frequency before actual power delivery begins. This preliminary action ensures that disconnections occur at optimal moments to prevent false alarms while still allowing necessary power conditioning element charging.
2Productivity
If high current is delivered to charge power conditioning elements rapidly, then charging time is reduced, but current may exceed safety regulations
Solution Approach 1:
The patent uses periodic pulsed power delivery with controlled duty cycle to charge power conditioning elements. By delivering high current in short pulses rather than continuous current, the system achieves rapid charging (improving productivity) while the average current remains within safety regulations, as the pulsed nature allows cooling and prevents continuous overheating hazards.
Solution Approach 2:
The system dynamically adjusts current parameters during start-up, delivering high peak currents during connected phases for rapid charging while maintaining low average current through controlled disconnection timing. This parameter change approach allows the system to transition from high-current pulsing to regulated continuous current once power conditioning elements are charged.
3Productivity
If multiple remote subunits are powered simultaneously, then system deployment is faster, but synchronization with power source becomes more difficult
Solution Approach 1:
The patent merges the synchronization functions of multiple remote subunits by having them all reference the same power source frequency. Instead of independent synchronization, each subunit locks its switching frequency to the common power source, simplifying the overall synchronization complexity while enabling simultaneous operation of multiple subunits during start-up.
Solution Approach 2:
The system performs preliminary frequency matching and phase alignment for all remote subunits before simultaneous power delivery begins. This preliminary synchronization action ensures that when multiple subunits operate concurrently, their disconnection events are coordinated to prevent false alarms, reducing the complexity that would otherwise arise from unsynchronized operations.
Data Source
AI summary
Systems and methods for power start up in a multi-unit power distribution network contemplate selectively disconnecting and reconnecting a remote subunit from a power conductor in a power distribution network at a relatively low frequency while providing short current pulses (at a low duty cycle) with enough energy transfer to power conditioning elements within the remote subunit during a start-up sequence. Once the power conditioning elements are properly charged, the remote subunit may change frequencies of the disconnecting and reconnecting so as to synchronize such disconnections to an expected frequency at the power source. Circuitry at the power source may measure activity on the power conductors regardless of frequency to detect an unwanted load on the power conductors (e.g., a human contacting the power conductors).