High-Intensity Discharge Lamp Driver Circuit with Reflected Energy Recovery
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Solution Overview
Problem
Conventional drive circuit systems for high-intensity discharging lamps face issues with voltage reflection at the transformer secondary, leading to energy wastage and switch damage, which are addressed by increasing switch voltage tolerance at a higher cost or reducing conversion efficiency.
Innovation Solution
A circuit system comprising a boosting circuit with a transformer and switch, an ignition coil circuit, and a clamp circuit that directs reflected energy from the transformer secondary back to the primary, utilizing diodes and capacitors to manage energy flow and prevent spark-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch with higher voltage withstanding is used to handle reflected voltage, then the switch can withstand the voltage stress, but the cost increases
Solution Approach 1:
The patent converts the harmful reflected voltage energy into a beneficial effect by using it to charge capacitor C1. The clamp circuit captures the reflected voltage from the transformer secondary and redirects it to charge the capacitor, transforming what would be damaging energy into useful stored energy that can be reused during the next switching cycle.
Solution Approach 2:
The patent introduces capacitor C1 as an intermediary energy storage element between the transformer secondary and the switch. This capacitor acts as a buffer that absorbs the reflected voltage energy, preventing direct voltage stress on the switch while allowing the energy to be stored and potentially reused.
2Reliability
If a clamp circuit is used to clamp the reflected voltage, then the switch is protected, but the conversion efficiency decreases
Solution Approach 1:
Instead of dissipating the reflected voltage energy as heat (which would reduce efficiency), the patent converts this harmful energy into useful stored energy by charging capacitor C1. The clamp circuit captures the reflected voltage and redirects it to charge the capacitor, transforming energy loss into energy storage that can be reused.
Solution Approach 2:
The patent recovers the reflected voltage energy that would otherwise be discarded as waste energy. The clamp circuit captures this energy and stores it in capacitor C1, making it available for reuse during subsequent operation cycles, thereby preventing energy loss and improving overall conversion efficiency.
3Device complexity
If the reflected energy is not directed back to the primary, then the circuit is simpler, but energy is wasted and switches may be damaged
Solution Approach 1:
The patent converts the previously wasted reflected energy into a beneficial stored energy form. The clamp circuit captures the reflected voltage from the transformer secondary and redirects it to charge capacitor C1, transforming energy waste into useful stored energy that can be reused during the next switching cycle.
Solution Approach 2:
The patent recovers the reflected energy that would otherwise be discarded as waste. The clamp circuit captures this energy and stores it in capacitor C1, making it available for reuse during subsequent operation cycles, thereby preventing energy loss while adding minimal 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
This solution prevents energy wastage and switch damage by efficiently redirecting reflected energy, reducing the need for high-voltage switches and maintaining conversion efficiency, thus avoiding increased costs and efficiency losses.
Implementation Method 1
the primary of the first transformer receives an input power, the secondary of the first transformer produces a boosting DC voltage
Implementation Method 2
directing energy, reflected from the secondary of the first transformer to the primary of the first transformer
Data Source
AI summary
The invention provides a circuit system for driving a high-intensity discharging lamp, comprising a boosting circuit, an ignition coil circuit and a clamp circuit. The boosting circuit includes a first transformer and a first switch, in which the primary of the first transformer receives an input power, the secondary of the first transformer produces a boosting DC voltage, and the first switch is connected to the first transformer to control turning-on and turning-off of the first transformer. The ignition coil circuit is connected to the boosting circuit for converting the boosting DC voltage into a switching AC voltage to drive a load. The clamp circuit is connected to the boosting circuit and the ignition coil circuit for directing energy, reflected from the secondary of the first transformer to the primary of the first transformer, to the secondary of the first transformer as the first switch is turned off.