Power Supply Protection Against Reverse Current During Startup
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Solution Overview
Problem
During the startup of a power supply unit, current can flow back to the power supply unit from the drive unit through a second voltage wire, causing abnormal operation due to recharging, which is not in a normal working state.
Innovation Solution
A protection module is introduced between the drive unit and the power supply unit, comprising an electronic switch unit and a voltage dividing unit, which prevents current recharging by maintaining the electronic switch in an OFF state until the power supply unit stabilizes, thereby preventing abnormal shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply unit applies voltage to the drive unit during startup, then the drive unit can be powered on, but current may flow back to the power supply unit causing abnormal operation
Solution Approach 1:
The patent introduces a protection unit as an intermediary component between the power supply unit and the drive unit. This protection unit includes a first switching element connected in series with the power supply unit's output, which is controlled by a control signal from the control unit. The switching element acts as a mediator that selectively blocks or allows current flow, preventing reverse current from reaching the power supply unit while still enabling normal power transmission during operation.
Solution Approach 2:
The control unit generates a control signal in advance to turn on the switching element before the power supply unit applies voltage to the drive unit. This preliminary action ensures the protection mechanism is already in place before the harmful reverse current can occur, preventing the abnormal operation of the power supply unit during startup.
2Reliability
If a protection unit is added to prevent current recharging, then abnormal operation is prevented, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it controls the switching element to prevent reverse current during startup, and also manages the normal operation of the power supply system. By making the control unit multi-functional, the patent avoids adding a completely separate control mechanism, thereby reducing the overall increase in device complexity while still achieving the protection function.
Solution Approach 2:
The protection unit is merged with the existing power supply circuit structure, where the switching element is integrated into the power transmission path and the control signal is generated by the existing control unit. This merging approach combines the protection function with the existing system components rather than adding entirely separate elements, minimizing the increase in device complexity.
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 abnormal operation of the power supply unit by ensuring that current does not recharge during startup, allowing the power supply unit to stabilize before normal operation resumes.
Implementation Method 1
The protection unit is electrically connected between the drive unit and the power supply unit and is used to prevent current from recharging
Implementation Method 2
a first resistor, An end of which is electrically connected to a first node on the first wire; and a second resistor, An end of which is electrically connected to the other end of the first resistor
Data Source
AI summary
A power supply device (100) and a display device (200). The power supply device (100) comprises a drive unit (10), a power source unit (20) and a protection unit (30); the drive unit is configured to drive the display device (200); the power source unit (20) is electrically connected to the drive unit (10); the power source unit (20) is configured to provide electric energy; the protection unit (30) is electrically connected between the drive unit (10) and the power source unit (20); and the protection unit (30) is configured to prevent current recharge.