Current-controlled, single-inductor, multiple-output, dc-dc converter with continuous conduction and discontinuous conduction modes
A SIMODC-DC, inductor technology, used in output power conversion devices, DC power input conversion to DC power output, control/regulation systems, etc., can solve the problem of low efficiency, large inductor current ripple, and inability to fully utilize Inductor saturation current rating, etc.
Pending Publication Date: 2021-12-17
MAXIM INTEGRATED PROD INC
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Problems solved by technology
Such a DCM converter cannot take full advantage of the inductor saturation current rating because discontinuous mode typically delivers at most Isat / 2
Also, operating at the limit of Isat / 2 is often inefficient due to the large inductor current ripple
Method used
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[0013] A SIMO converter and a controller for a SIMO converter are described that operate in continuous conduction mode (CCM) (in which the inductor current does not reach zero during each cycle) and discontinuous Both operate in conduction mode (DCM), where the inductor current reaches zero for a portion of each cycle. The converter automatically determines whether it should operate in DCM or CCM based on the output voltage, typically operating in CCM under heavy load conditions and DCM under light load conditions. It addresses cross-regulation and transient response where the load current may or may not be unbalanced and maximizes the energy storage capabilities of the inductor. Therefore, by time-sharing the inductor, the converter can support higher current levels for a given inductor saturation current rating and operate at higher efficiency than typical DCM SIMO converters.
[0014] The SIMO converter has a first output filter 102 , a second output filter 104 and a third...
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A controller for a SIMO DC-DC converter operable under CCM and DCM receives a signal representative of an inductor current and a signal representative of first and second DC-DC converter outputs. The controller has first and second outputs adapted to control electronic switches coupled to first and second output filters, and third and fourth outputs adapted to control the current in a inductor. The controller controls the outputs based on the inputs by determining a desired PWL inductor current and a current waveform, and determines a pulse width of the outputs to match the inductor current to the desired PWL. A timer controls the pulse width of the outputs, and the controller dynamically selects either DCM or CCM to maintain the first and second DC-DC converter outputs at a predetermined level. In an embodiment, the desired PWL inductor current is one or both of a desired valley current and a desired peak current.
Description
[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to U.S. Provisional Patent Application Serial No. 63 / 039,401, filed June 15, 2020, which is hereby incorporated by reference in its entirety. Background technique [0003] Single-Inductor Multiple-Output (SIMO) converters use one inductor to regulate multiple output voltages by time-sharing the inductor, which is achieved by time-sharing the inductor among multiple outputs within one operating cycle. Typical SIMO converters on the market operate only in discontinuous conduction mode (DCM), where the inductor current reaches zero during each cycle. Such DCM converters cannot take full advantage of the inductor saturation current rating because discontinuous mode typically delivers at most Isat / 2. Also, operating at the limit of Isat / 2 is often inefficient due to the large inductor current ripple. Increasing the maximum load current capability requires both increasing the p...
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IPC IPC(8): H02M3/156H02M1/088
CPCH02M3/156H02M1/088H02M3/1582H02M3/158H02M1/009H02M3/1584Y02B70/10H02M1/14
Inventor J·M·伯克哈特M·斯特拉耶尔
Owner MAXIM INTEGRATED PROD INC