Adaptive dead-time controller
AssigneeLeadtrend Technology Corp.
InventorsMing-Ying Kuo, Hung-Ta Lee
Life of this patent
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Abstract
An adaptive dead-time controller is provided to improve a conversion efficiency of a power converter at a low/no load condition. The adaptive dead-time controller has a reference voltage generator, an error amplifier, a comparator, an oscillator, an adaptive dead-time generator and a flip-flop. The adaptive dead-time controller outputs a gate pulse according to an output voltage and an oscillation. When power converter is at a low/no load condition, the adaptive dead-time generator delays a rising edge of an oscillation signal by a dead-time from a rising edge of a clock signal, so the frequency of the gate pulse and the power consumption of the power converter are reduced.
Claims17
An adaptive dead-time generator for adjusting an oscillation signal corresponding to a clock signal according to an output voltage, comprising:
- a converting circuit for outputting a converted signal corresponding to the output voltage;
- a controlled power source for providing an output energy according to the converted signal;
- a standard power source for providing a default energy;
- an inverter for inputting the clock signal to output an inverted clock signal;
- an energy storage unit for storing the output energy and the default energy and providing a charging energy;
- a switch for providing a path for the energy storage unit to discharge the output energy and the default energy according to the inverted clock signal;
- and
- a comparator for comparing the charging voltage with a threshold voltage and outputting the oscillation signal according to the comparison result;
- wherein when the output voltage drops, a rising edge of the oscillation signal is delayed by a dead-time from a rising edge of the clock signal.
An adaptive dead-time generator for adjusting an oscillation signal corresponding to a clock signal according to an output voltage, comprising:
- an oscillator for outputting a clock output signal according to the output voltage;
- and
- a counter for counting the clock output signal and outputting the oscillation signal when the count exceeds a threshold number;
- wherein when the output voltage drops, a rising edge of the oscillation signal is delayed by a dead-time from a rising edge of the clock signal.
An adaptive dead-time controller for adjusting a operating frequency of a power converter according to a load condition, comprising:
- a reference voltage generator for providing a reference voltage;
- an error amplifier for comparing an output voltage with the reference voltage then outputting an error voltage, the output voltage being proportionally to the load condition;
- a comparator for comparing the error voltage with a switch voltage then outputting a reset signal;
- an oscillator for providing a clock signal;
- an adaptive dead-time generator for adjusting an oscillation signal corresponding to the clock signal according to the load condition then outputting the adjusted oscillation signal;
- and
- a flip-flop for outputting a gate pulse according to the reset signal and the oscillation signal,
- wherein the gate pulse is adapted to adjust the function of the power converter, when the load condition is light, a rising edge of the oscillation signal is delayed by a dead-time from a rising edge of the clock signal.
Dependencies are inferred from the claim text.