Fluorescent Electronic Ballast Detection Protection Circuit
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Solution Overview
Problem
Existing fluorescent electronic ballasts risk damaging power semiconductor switching units and control chips due to high voltage electrolytic capacitors maintaining power supply after voltage drop, causing the inverter circuit to become a capacitive load.
Innovation Solution
Incorporating a detection protection circuit that monitors the direct current power supply and cuts off power to the control chip when the voltage falls below a predetermined value, preventing continuous operation and capacitive load formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If high voltage electrolytic capacitors are used in the power factor correction circuit to maintain power supply after voltage drop, then the continuous operation of the inverter circuit is enabled, but the inverter circuit becomes a capacitive load increasing the possibility of breaking down power semiconductor switching units and control chip
Solution Approach 1:
The patent implements a detection protection circuit that monitors the voltage of the direct current power supply and provides feedback control. When the voltage drops below a predetermined value, the circuit automatically detects this condition and cuts off the electric connection between the control chip and the power supply, preventing the inverter circuit from becoming a capacitive load and protecting against breakdown of power semiconductor switching units and control chip.
Solution Approach 2:
The detection protection circuit acts as an intermediary between the power supply and the inverter circuit. It includes a detection unit that monitors power supply voltage and a protection unit that controls the connection state. This intermediary mechanism prevents direct harmful effects from reaching the inverter circuit by cutting off power supply when voltage is insufficient, thus protecting the control chip and power semiconductor switching units.
2Reliability
If the detection protection circuit cuts off power supply when voltage is low, then the reliability of power semiconductor switching units and control chip is improved, but the complexity of the circuit increases
Solution Approach 1:
The detection protection circuit merges the detection function and protection function into a single integrated circuit unit. The detection unit monitors power supply voltage and the protection unit controls the connection state, combining multiple functions into one component that protects the inverter circuit while adding minimal complexity to the overall system.
Solution Approach 2:
The detection protection circuit uses simple voltage detection and switching mechanisms that can be implemented with basic electronic components. By using a straightforward voltage threshold detection approach, the circuit achieves reliable protection without requiring complex control algorithms or expensive components, thus minimizing the increase in circuit 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
Prevents damage to power semiconductor switching units and control chips, prolonging the lifespan of the fluorescent electronic ballast by ensuring proper shutdown and maintaining the inverter circuit as an inductive load.
Implementation Method 1
a rectifier circuit, for receiving an alternating current (AC) power supply and converting the alternating current into a direct current (DC) power supply
Implementation Method 2
an inverter circuit, coupled to a fluorescent driver circuit, for converting the direct current power supply into a high-frequency alternating current power supply
Data Source
AI summary
A fluorescent electronic ballast including: a rectifier circuit, for receiving an AC power supply and converting the AC power supply into a DC power supply; an inverter circuit, coupled to a fluorescent driver circuit, for converting the DC power supply into a high-frequency AC power supply for driving a fluorescent; and a detection protection circuit, coupled to the rectifier circuit and the inverter circuit, for detecting the DC power supply provided by the rectifier circuit, and cutting off the electric connection between a control chip of the inverter circuit and all of power supply when the voltage of the direct current power supply is lower than a predetermined value, wherein the power supply at least includes the direct current power supply provided by the rectifier circuit.