LED Lighting Circuit Capacitive Current Balancing

The patent introduces capacitors as intermediary components connected in parallel with each LED string. These capacitors act as mediators that store and release energy to balance currents across different LED strings without the continuous energy dissipation associated with resistors. The capacitors equalize voltage drops across strings during charging and discharging cycles, achieving current balancing while minimizing energy loss.

The patent changes the circuit parameters by replacing resistive elements with capacitive elements. This parameter change transforms the current balancing mechanism from one based on resistive voltage division (which dissipates energy) to one based on capacitive energy storage and release (which minimizes energy loss). The capacitive arrangement fundamentally alters how current balancing is achieved, shifting from continuous dissipation to periodic energy exchange.

The patent extracts the essential function of current balancing from complex transformer-based circuits and implements it using simple capacitive elements. By taking out only the necessary energy storage and release function (realized through capacitors), the solution eliminates unnecessary complexity while maintaining current balancing capability. This extraction approach removes transformers, feedback networks, and associated control circuits, leaving only the essential capacitive components.

The patent replaces expensive, bulky transformers with inexpensive, compact capacitors. Capacitors are significantly smaller, cheaper, and simpler than transformers while achieving the same current balancing function. This substitution aligns with using simpler, more economical components that can be easily integrated into LED driver circuits without requiring additional energy-recycling networks or complex control mechanisms.

The capacitive arrangement enables self-service current balancing where each capacitor automatically charges and discharges in response to voltage variations across LED strings. This self-regulating mechanism balances currents without requiring external reactive power or circulating energy from the power source. The capacitors use the existing power flow to equalize currents, achieving balancing without additional energy loss or reactive power requirements.

The patent converts the natural voltage variations and current imbalances (which would normally be harmful) into useful information for balancing. The capacitors exploit voltage differences between LED strings during charging, and these same voltage differences drive discharging that equalizes currents. What would normally be seen as instability or inefficiency is transformed into the driving force for current balancing, turning potential harm into benefit without requiring additional reactive power.