DC Power Supply Anti-Misconnection Module for LED Systems
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Solution Overview
Problem
DC power supplies for LED lamps are prone to damage due to misconnection with high voltage sources, leading to uncontrolled current flow and potential fire hazards during installation or testing.
Innovation Solution
A DC power supply with an anti-misconnection module that includes a NMOS transistor and diodes to prevent incorrect connection, ensuring the power supply remains functional even if the positive and negative terminals are mistakenly connected to an external power source, using a combination of diodes and resistors to manage voltage and current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the DC power supply output terminals are connected during installation or testing, then the power supply can provide electricity to LED lamps, but the terminals may be mistakenly connected to high voltage sources causing uncontrolled current flow and damage
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring protective circuit elements (diodes and resistors) in the power supply output terminals before any connection occurs. These elements are designed to automatically detect and block high voltage inputs through voltage differential detection, preventing misconnection damage before it can occur during installation or testing operations
2Reliability
If protective measures are added to prevent misconnection, then the reliability of the power supply improves, but the device complexity increases
Solution Approach 1:
The protective function is segmented into distinct modular components: voltage detection diodes connected to the output terminals, current-limiting resistors, and control logic. This segmentation allows each component to perform a specific protective function independently, making the overall system more manageable and easier to implement without excessive complexity
Solution Approach 2:
The patent introduces intermediary protective elements (diodes and resistors) between the output terminals and external connections. These intermediaries act as mediators that detect voltage differentials and automatically activate protective measures, providing reliable misconnection protection while maintaining relatively simple circuit architecture through the use of standard electronic components
3Temperature
If the power supply uses low voltage DC output suitable for LED lamps, then the safety for LED operation is improved, but the vulnerability to misconnection with high voltage sources increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring voltage detection and protection circuits that are active before any connection is made. The protective diodes and resistors are permanently installed in the circuit, ready to immediately detect and respond to high voltage misconnections, allowing the low voltage DC power supply to safely operate LED lamps while being protected against high voltage damage
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 prevents damage to the DC power supply by blocking incorrect voltage levels, ensuring safe operation and reducing maintenance workload by maintaining reliability of power supply products.
Implementation Method 1
a anti-misconnection module electrically connected to the DC power supply wherein the anti-misconnection module comprises a positive access terminal and a negative access terminal
Implementation Method 2
a NMOS transistor controlling on-off of the negative access terminal
Implementation Method 3
a zener diode D5 connected in series between the negative input terminal and the gate of the NMOS transistor
Data Source
AI summary
A DC power supply for preventing output from being misconnected to a power supply and its LED lamp and control system, comprise a DC power supply and an anti-misconnection module. The DC power supply comprises a positive output terminal and a negative output terminal. The anti-misconnection module comprises a positive access terminal and a negative access terminal which are electrically connected to the positive and negative output terminals of the DC power supply respectively, a NMOS transistor controlling on-off of the negative access terminal, a load access unit performing a turn-on operation of the NMOS transistor, a forward-blocking unit performing a turn-off operation of the NMOS transistor, and a backward access unit performing a turn-off operation of the NMOS transistor. The present invention prevents the DC power supply from being damaged even if the positive access terminal and the negative access terminal of the DC power supply are mis-connected to the external power supply, such as the electric supply or the dry battery. As long as the external power supply is removed and the normal load is connected, such as LED lamps, the DC power supply of the present invention can work normally, so that it can not only improve the reliability of power supply products, but also can reduce the corresponding maintenance workload.