Resonant converter circuit
AssigneeRenesas Design (UK) Limited
InventorsGuang FENG, Yong LI
Life of this patent
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Abstract
A resonant converter circuit configured to receive an input voltage at an input port and output an output voltage at an output port, operating in a discontinuous conduction mode, the resonant converter circuit including: a main switch; a reset switch; a resonant tank circuit connected across the reset switch, the resonant tank circuit including an inductive device; and a first node connected between the main switch and the reset switch. The resonant converter circuit is configured to: calculate a turn on time for the main switch; and turn on the main switch at the turn on time. A turn on time for the reset switch is determined based on the turn on time for the main switch, such that the reset switch turns on only after the main switch has been turned on.
Claims18
A resonant converter circuit configured to receive an input voltage at an input port and output an output voltage at an output port, operating in a discontinuous conduction mode, the resonant converter circuit comprising:
- a main switch;
- a reset switch;
- a resonant tank circuit connected across the reset switch, the resonant tank circuit comprising an inductive device;
- and
- a first node connected between the main switch and the reset switch;
- wherein the resonant converter circuit is configured to:
- calculate a turn on time for the main switch;
- and
- turn on the main switch at the turn on time;
- and
- wherein a turn on time for the reset switch is determined based on the turn on time for the main switch, such that the reset switch turns on only after the main switch has been turned on.
A resonant converter circuit configured to receive an input voltage at an input port and output an output voltage at an output port, operating in a discontinuous conduction mode, the resonant converter circuit comprising:
- a main switch;
- a reset switch;
- a resonant tank circuit connected across either the reset switch, the resonant tank circuit comprising an inductive device;
- and
- a first node connected between the main switch and the reset switch;
- wherein the resonant converter circuit is configured to:
- calculate a turn on time for the main switch;
- monitor a voltage across the first node;
- determine that a first condition is met when a rate of change of the voltage across the first node is within a first predefined threshold of zero;
- determine that a second condition is met when a current time is within a second predefined threshold of the turn on time;
- and
- if the first condition and the second condition are met, turn on the main switch.
A method of operating a resonant converter circuit, the resonant converter circuit configured to receive an input voltage at an input port and output an output voltage at an output port, operating in a discontinuous conduction mode, the method comprising:
- calculating a turn on time for a main switch of the resonant converter circuit;
- and
- turning on the main switch at the calculated turn on time,
- wherein a turn on time for the reset switch is determined based on the turn on time for the main switch, such that the reset switch turns on only after the main switch has been turned on.
Dependencies are inferred from the claim text.