Electric Shock Prevention in LED Systems

Protecting LED lighting circuits with multiple parallel strings of LEDs to prevent failures in one string from cascading and damaging others. The protection involves a bidirectional conduction arrangement between taps in adjacent strings. If the voltage difference between the taps exceeds a threshold, indicating an open circuit in one string, the bidirectional conduction arrangement conducts and generates a fault signal. This is sent to a control circuit to decrease power to all strings. This prevents overcurrent in failed strings. The protection is low-cost using resistors, optocouplers, and comparators.

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Multi-functional non-electric shock prevention system for protecting against electric shock and electrocution hazards in electrical devices. The system uses a ground fault interruption circuit to detect and block ground fault currents, a noise filter to shield, absorb and reduce leakage currents, and a frequency modulation compensation circuit to convert power into a sinusoidal band without external disturbances. This prevents non-electric shock, sensing abnormal states, compensating frequencies to block external surges, and adapting the power into a sinusoidal band utilizing a wave band based on an equal electric potential phenomenon of each phase interval.

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A light strip design for display backlights that improves antistatic protection to prevent LED failures during electrostatic discharge (ESD) testing. The light strip has an array of LEDs on a flexible circuit board. The LEDs are divided into groups with series connections. Each group has a head LED and tail LED between a positive and negative connection. The first negative connection is at one end of the board. This arrangement ensures that ESD applied at that point will pass through a series of LEDs before reaching the weak position between the first and second LEDs in the group.

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An LED short circuit protection controller that can provide protection for LEDs when they are short circuited, with automatic recovery capability. The controller has a circuit body with voltage isolation, a driving unit to start/stop the isolation, and a feedback loop. The isolation unit is connected in series between input and output power terminals. When a short circuit occurs, the driving unit stops the isolation. The feedback loop detects the output voltage drop and signals the driving unit to restart the isolation. This isolates the short circuit from the input power, protects the controller, and allows recovery when the short is cleared.

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A connector system for LED tube lamps provides a safe, reliable, and convenient means for grounding the heat sink and internal components of the lamp. The connector system includes a sleeve that removably connects to the ends of the lamp body and has a third grounding pin that engages with a fourth grounded lamp holder on the lighting fixture. This provides electrical grounding between the lamp body and the fixture. The sleeve also simplifies installation by allowing the lamp to be inserted and rotated using just one end, rather than both ends.

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A light strip design that improves anti-static properties and prevents LED failures during electro-static discharge testing of display backlights. The light strip has a series configuration of LEDs that provides redundancy and prevents voltage breakdown at weak points. The LEDs are arranged in isolated groups between positive and negative connections on a circuit board, with the first and last LEDs connecting to the negative end.

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A grounded electrical connector system for linear LED lamps provides a safe, reliable way to ground the heat sinks and internal components of linear LED lamps to prevent shock and fire hazards. The connector system has an electrical ground connection that contacts the lamp heat sink when the lamp is inserted. This provides a ground path for any electrical leakage. The system uses a connector sleeve that allows the lamp to be easily installed from one end rather than aligning both ends.

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Circuit and method for reliably protecting LED light strings from open circuit and ground short faults. The circuit accurately identifies open circuit vs ground short faults in an LED string. It has a short circuit protection circuit to detect ground shorts. When an LED string has a short to ground, the circuit stops power. For open circuits, it charges the feedback terminal and compares against a threshold to confirm. If open, it isolates the string. This prevents ground shorts misdiagnosing as opens.

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LED power supply with electric shock prevention and alarm capabilities. The power supply has sensors on the top to detect if someone is approaching. If so, it warns them to stay back. Inside the housing, a control board monitors power and can remotely alert if a shock occurs. This allows finding and rescuing the shocked person. The control board also has backup power, storage, and wireless communication.

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A grounded connector system for LED tube lamps provides a safe, reliable, and convenient solution with all safety concerns addressed to allow the benefits of LED lamp technology to be fully realized. The grounded connector system ensures the LED lamp heat sink and internal electrical components are electrically grounded to protect against shock and fire hazards. It also allows installation from one end and uses a protective sleeve to align and connect both ends.

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A light-emitting diode (LED) tube lamp that is safe, reliable, and convenient to install in existing fluorescent lighting fixtures. The LED tube lamp has a connector system that allows the lamp to be grounded for safety. The connector system includes three parts: 1) a power connector that receives power from the fixture; 2) an elongated sleeve that covers the LED tube and prevents shock hazards; and 3) a remote connector that attaches to the fixture. The sleeve provides convenience to the lamp installer and allows for both ends of the lamp to be installed by manipulating the lamp from the power end.

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LED bulb lamp that provides an improved light distribution with a smooth, even brightness transition. The lamp uses a unique design of an electrical isolation assembly to separate the charged electrical components from the outer surface of the lamp housing, reducing the risk of electric shock if the bulb breaks.

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Single lamp control device with leakage detection that can actively detect and alarm for electrical leakage in outdoor lighting systems. The device has a built-in leakage detection unit that monitors the lamp's electrical connections for shorts between live, neutral, and ground wires. If leakage is detected, the device can remotely alarm via wireless communication to avoid safety hazards caused by improper grounding or faulty wiring. The device also has features like dimming, metering, and surge protection.

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A leakage protection circuit for power supplies that can detect and disconnect power in the event of ground leakage or induced currents. The circuit uses three-pole disconnection to isolate the live, neutral, and ground wires. It has an IC chip, two zero-sequence transformers, diodes, triodes, and a thyristor. The transformers isolate the ground wire. Sensors detect leakage on the neutral and live wires. If leakage is detected, the circuit disconnects the corresponding wire using the thyristor and triodes. This prevents shock hazards from ground leakage or induced currents.

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A lighting device that is safe even if the frangible bulb breaks. The device has a frangible housing with a window, and inside are SSL elements and electrical connectors. The clever aspect is that the window mechanically holds the connectors together. If the window breaks, the connectors separate, and power to the SSL elements is cut off.

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A connector system for LED tube lamps that enables safe and reliable grounding of the lamps. The connector system uses a sleeve with grounded contacts that the lamp pins engage with. This sleeve connects to the lamp holders on the fixture. The grounded contacts provide an electrical path from the lamp pins to the ground when the lamp is installed. This ensures proper grounding of the metal heat sink and electrical components inside the lamp to prevent shock and fire hazards.

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A grounded connector system for LED tube lamps that solves the safety issue of exposed metal heat sinks and internal components. The connector system has grounding contacts that connect to a ground wire when the lamp is installed. This provides a safe ground path for the heat sink and internal components, reducing shock and fire hazards. The system also has a connector sleeve for easier lamp installation.

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A connector system for LED lighting that provides grounding of the heat sink and internal components. The system uses a connector sleeve that surrounds the ends of the lamp. This sleeve has a grounding contact that engages a ground pin in the lamp holders. When the lamp is installed, the sleeve connects the lamp's metal heat sink to ground. This protects against electrical shock and fire hazards if the internal components short circuit.

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A grounded connector system for LED tube lamps that provides a safe, reliable and convenient solution for grounding the LED heat sink and internal components. The system includes a three-part connector that securely attaches the ends of the LED tube to the fixture while also grounding the exposed heat sink. The connector parts have pins and sockets to mechanically connect and electrically ground the tube ends. A connector sleeve can be used to hold the two connector parts together during installation. The grounded connector system protects against electrical shock and fire hazards from exposed components, provides surge protection, and ensures proper grounding of the heat sink.

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A connector system for LED tube lamps that allows safe, grounded installation of the lamps into lighting fixtures while addressing all safety and regulatory concerns. The connector system securely holds the lamps in place and provides electrical isolation and grounding of the heat sink and internal components. The system uses connector parts at each end of the lamp that mate with corresponding parts mounted in the fixture. A protective sleeve can enclose the connectors. The connector parts have conductive contacts for power transmission and grounding tabs that engage conductive surfaces on the fixture. This creates a grounded path for any leaked electrical current from the internal components.

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