Switch-mode power supplies including three-level LLC circuits
AssigneeAstec International Limited
InventorJames Sigamani
Life of this patent
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Abstract
A switch-mode power supply includes a pair of input terminals, a pair of output terminals, and at least four switches coupled in a three-level LLC circuit arrangement between the pair of input terminals and the pair of output terminals. First and second ones of the at least four switches define a first half-bridge and third and fourth ones of the at least four switches define a second half-bridge. The power supply also includes a fifth switch coupled across the second switch and the third switch to short circuit the second switch and the third switch when the fifth switch is closed, and a control circuit. The control circuit includes a voltage-controlled oscillator (VCO) and multiple logic gates and flip-flops coupled to operate the at least four switches with zero-voltage switching (ZVS).
Claims20
A switch-mode power supply, comprising:
- a pair of input terminals for receiving an alternating current (AC) or direct current (DC) voltage input from an input power source;
- a pair of output terminals for supplying a direct current (DC) voltage output to a load;
- at least four switches coupled in a three-level LLC circuit arrangement between the pair of input terminals and the pair of output terminals, with first and second ones of the at least four switches defining a first half-bridge and third and fourth ones of the at least four switches defining a second half-bridge;
- a fifth switch coupled across the second switch and the third switch to short circuit the second switch and the third switch when the fifth switch is closed;
- and
- a control circuit including a voltage-controlled oscillator (VCO) and multiple logic gates and flip-flops coupled to operate the at least four switches with zero-voltage switching (ZVS).
A switch-mode power supply, comprising:
- a pair of input terminals for receiving an alternating current (AC) or direct current (DC) voltage input from an input power source;
- a pair of output terminals for supplying a direct current (DC) voltage output to a load;
- a circuit ground;
- at least four switches coupled in a three-level LLC circuit arrangement between the pair of input terminals and the pair of output terminals, with first and second ones of the at least four switches defining a first half-bridge and third and fourth ones of the at least four switches defining a second half-bridge, the first half-bridge coupled between the circuit ground and a first one of the pair of input terminals, and the second half-bridge coupled between the circuit ground and a second one of the pair of input terminals;
- and
- a fifth switch coupled across the second switch and the third switch to short circuit the second switch and the third switch when the fifth switch is closed.
A switch-mode power supply, comprising:
- a pair of input terminals for receiving an alternating current (AC) or direct current (DC) voltage input from an input power source;
- a pair of output terminals for supplying a direct current (DC) voltage output to a load;
- a transformer having a primary side and a secondary side;
- at least four switches coupled in a three-level LLC circuit arrangement between the pair of input terminals and the primary side of the transformer, with a fifth switch coupled across two of the at least four switches coupled in the three-level LLC circuit arrangement to short said two switches when the fifth switch is closed;
- and
- a control circuit including a voltage-controlled oscillator (VCO) and multiple logic gates and flip-flops coupled to operate the five switches.
Dependencies are inferred from the claim text.