Shared Timer Control Circuit for Low-Loss Switching Power Sources

The patent implements dynamic switching frequency adjustment based on load conditions. The control circuit monitors the load state and automatically varies the switching frequency: operating at lower frequencies during light load states to reduce switching losses, and at higher frequencies during heavy load states to maintain adequate power delivery. This dynamic adaptation resolves the contradiction by making the switching frequency a variable parameter rather than a fixed value.

The patent changes the operating parameters of the switching power source based on load conditions. Specifically, it adjusts the switching frequency and ON/OFF period durations as controllable parameters. By modifying these parameters in response to load state changes, the system optimizes the balance between maintaining output voltage and minimizing switching losses, thereby improving energy efficiency without sacrificing productivity.

The patent employs dynamic control of the switching frequency based on real-time load monitoring. During light load states, the switching frequency is reduced to minimize switching losses and energy consumption. During heavy load states or transient conditions requiring faster response, the frequency is increased accordingly. This dynamic adjustment strategy resolves the contradiction by adapting the switching speed to actual operational needs rather than maintaining a constantly high frequency.

The patent utilizes periodic switching with variable period durations. The control circuit adjusts the ON and OFF period lengths based on load conditions, creating a flexible periodic action pattern. This allows the system to achieve adequate response time when needed while minimizing the number of switching cycles during light load states, thereby reducing overall switching losses and energy consumption.

The patent implements a single timer circuit that performs multiple functions: generating the switching clock signal, controlling the ON period duration, controlling the OFF period duration, and providing overcurrent protection timing. By designing this one timer circuit to handle all these timing-related tasks through different operational modes or configurations, the patent achieves the multi-functionality needed for precise control without increasing the number of timer circuits, thus maintaining low circuit complexity while preserving control precision.

The patent merges the functions of multiple separate timer circuits into a single integrated timer unit. Instead of having distinct timer circuits for ON period control, OFF period control, and overcurrent protection, the invention combines these timing functions into one versatile timer circuit. This consolidation reduces circuit complexity while maintaining the necessary control precision through careful internal design of the single timer unit.