Switch-mode power supplies including three-level LLC circuits for low line and high line operation
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 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, 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. The power supply also includes a voltage doubler power factor correction (PFC) circuit coupled between the pair of input terminals and the three-level LLC circuit, and a control circuit coupled to operate the at least four switches to supply the DC voltage output to the load.
Claims20
A switch-mode power supply, comprising:
- a pair of input terminals for receiving an input voltage input from a power source;
- a pair of output terminals for supplying a direct current (DC) voltage output to a load;
- a plurality of switches coupled in a three-level LLC circuit arrangement between the pair of input terminals and the pair of output terminals;
- and
- a voltage doubler power factor correction (PFC) circuit coupled between the pair of input terminals and the three-level LLC circuit, the voltage doubler PFC configured to:
- supply a first PFC voltage output in response to the voltage input being within a specified low line voltage range;
- and
- supply a second PFC voltage output in response to the voltage input being within a specified high line voltage range;
- a control circuit configured to:
- operate the plurality of switches of the three-level LLC circuit arrangement in a first mode of operation in response to the voltage input being within the specified low line voltage range;
- and
- operate the plurality of switches of the three-level LLC circuit arrangement in a second mode of operation when the voltage input is within the specified high line voltage range.
A switch-mode power supply, comprising:
- a pair of input terminals for receiving an input voltage input from a power source;
- a pair of output terminals for supplying a direct current (DC) voltage output to a load;
- a plurality of switches coupled in a three-level LLC circuit arrangement between the pair of input terminals and the pair of output terminals;
- and
- a voltage doubler power factor correction (PFC) circuit coupled between the pair of input terminals and the three-level LLC circuit;
- and
- a control circuit coupled to the plurality of switches of the three-level LLC circuit arrangement;
- wherein, in response to the voltage input being within a specified low line voltage range:
- the voltage doubler PFC is configured to supply a first PFC voltage output;
- and
- the control circuit is configured to operate the plurality of switches of the three-level LLC circuit arrangement in a first mode of operation;
- and
- wherein, in response to the voltage input being within a specified high line voltage range:
- the voltage doubler PFC is configured to supply a second PFC voltage output;
- and
- the control circuit is configured to operate the plurality of switches of the three-level LLC circuit arrangement in a second mode of operation.
A method of operating a switch-mode power supply including a pair of input terminals and at least two PFC circuit switches coupled in a voltage doubler power factor correction (PFC) circuit coupled to the pair of input terminals, the method comprising:
- operating the at least two PFC circuit switches of the voltage doubler PFC circuit according to a first voltage reference in response to the voltage input being within a specified low line voltage range to increase a voltage input received at the pair of input terminals to a first increased PFC voltage;
- supplying the first increased PFC voltage in response to the voltage input being within the specified low line voltage range;
- operating the at least two PFC circuit switches of the voltage doubler PFC circuit according to a second voltage reference in response to the voltage input being within a specified high line voltage range to increase the voltage input received at the pair of input terminals to a second increased PFC voltage;
- and
- supplying the second increased PFC voltage in response to the voltage input being within the specified high line voltage range.
Dependencies are inferred from the claim text.