Snubber Circuit Delaying LED Drive Activation

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Solution Overview

Problem

Existing LED drive circuit protection methods are inadequate in managing unpredictable surge peaks, which can still cause damage or failure despite the use of protection circuits, as the peak value of input surges is unpredictable, leading to potential damage or failure of the LED drive circuit.

Innovation Solution

A circuit protection apparatus with a snubber circuit that includes a first switch unit and a control unit, which delays the start of the LED drive circuit based on input power and provides a start signal after a predetermined delay time, ensuring the ground points of the snubber circuit and the LED drive circuit are commonly grounded, providing a two-step protection mechanism to prevent surge damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a protection circuit is used to suppress input surges, then the LED drive circuit is protected from surge impact, but high surge peaks can still cause damage or failure due to unpredictable surge magnitude

Engineering Contradiction:

Improveprotection effectivenessVSAvoidsurge peak damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by introducing a delay mechanism that prevents the LED drive circuit from operating during the initial period when surge peaks are most likely to occur. The controller delays the start signal to the LED drive circuit until a predetermined time period has elapsed since power input, thereby avoiding the harmful surge peaks before they can cause damage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements preliminary anti-action by using the delay mechanism to counteract the harmful effect of surge peaks before they can affect the LED drive circuit. The predetermined delay time creates a protective window that neutralizes the impact of unpredictable surge magnitudes by ensuring the circuit is not vulnerable during the critical initial period.

Inventive Principle:

Principle #9Preliminary anti-action

2Productivity

If the LED drive circuit is started immediately upon power input, then the circuit responds quickly, but it becomes vulnerable to unpredictable surge peaks causing damage

Engineering Contradiction:

Improvecircuit response speedVSAvoidcircuit safety

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The controller performs a preliminary action by introducing a delay before activating the LED drive circuit. This predetermined delay time period allows the system to avoid the initial surge peaks while still maintaining relatively quick response compared to other protection methods, balancing productivity and reliability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11503689B1Circuit protection apparatus, snubber circuit, and method of operating circuit protection apparatus

Publication Date: 2022.11.15 HERGY INT CORP

AI summary

A circuit protection apparatus (100) is used to protect an LED drive circuit (200), and the circuit protection apparatus (100) includes a first switch unit (1) and a snubber circuit (3). The first switch unit (1) provides an electrical connection between an input terminal (100A) and the LED drive circuit (200) according to the normality of an input current (Iin) flowing through the input terminal (100A). The snubber circuit (3) provides a first delay time period (Td1) according to an input power (Vin). The snubber circuit (3) provides a start signal (Ss) to the LED drive circuit (200) according to the end of the first delay time period (Td1), and controls a first ground point (G1) of the snubber circuit (3) to be coupled to a second ground point (G2) of the LED drive circuit (200).