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US 12,763,692 B2Granted
Single-stage multi-output switching power converter
AssigneeRenesas Design (UK) Limited
InventorsYimin Chen, Guoxiong Chen, Yong Li, John Kesterson
Life of this patent
Estimating the term…
Abstract
A single-stage multiple-output switching power converter is provided that includes a switch in each output. A secondary controller controls the switches to distribute a secondary winding current to the multiple outputs so as to regulate a different output voltage at each multiple output.
Claims14
A single-stage multiple-output switching power converter, comprising:
- a transformer having a primary winding and a secondary winding;
- a plurality of outputs coupled to the secondary winding, each output of the plurality of outputs including a loop compensator configured to convert an error voltage of the output into a control voltage and including a serial combination of a rectifier, a secondary switch, and an output terminal;
- a secondary controller configured to control the secondary switch for each output of the plurality of outputs to regulate a corresponding output voltage at each corresponding output terminal;
- a power switch transistor coupled between the primary winding and ground, wherein the secondary controller is further configured to control each secondary switch to distribute a secondary winding current to the plurality of outputs in an order during an off-time of the power switch transistor;
- a primary controller configured to control a cycling of the power switch transistor;
- a ground-isolating channel coupled between the primary controller and the secondary controller;
- and
- an adder configured to add the control voltage for each output of the plurality of outputs to form a combined control voltage that is transmitted over the ground-isolating channel to the primary controller.
5 more elements
A switching power converter method, comprising:
- cycling off a power switch transistor coupled to a primary winding of a transformer following a first on-time of the power switch transistor, wherein the power switch transistor is maintained off for an off-time;
- switching on a first switch after the first on-time, wherein the first switch is coupled to a secondary winding of the transformer through a first rectifier to distribute a first portion of a secondary winding current to a first output terminal during a first portion of the off-time;
- switching off the first switch responsive to a first output voltage at the first output terminal exceeding a first reference voltage;
- switching on a second switch coupled to the secondary winding of the transformer through a second rectifier to distribute a second portion of the secondary winding current to a second output terminal during a second portion of the off-time;
- forming a first error voltage equaling a difference between the first reference voltage and the first output voltage;
- processing the first error voltage through a first loop compensator to form a first control voltage;
- forming a second error voltage equaling a difference between a second reference voltage and a second output voltage at the second output terminal;
- processing the second error voltage through a second loop compensator to form a second control voltage;
- and
- forming a combined control voltage from a function of the first control voltage and of the second control voltage.
7 more elements
A single-stage multiple-output switching power converter, comprising:
- a transformer including a primary winding and a secondary winding;
- a first rectifier and a first switch coupled in series between the secondary winding and a first output terminal;
- a second rectifier and a second switch coupled in series between the secondary winding and a second output terminal;
- a first loop compensator configured to process a first error voltage equaling a difference between a first reference voltage and a voltage of the first output terminal into a first control voltage;
- a second loop compensator configured to process a second error voltage equaling a difference between a second reference voltage and a voltage of the second output terminal into a second control voltage;
- a control voltage circuit configured to form a combined control voltage from a function of the first control voltage and of the second control voltage;
- a power switch transistor coupled between the primary winding and ground;
- a primary controller configured to control a cycling of the power switch transistor responsive to the combined control voltage;
- a ground-isolating channel coupled between the control voltage circuit and the primary controller;
- a first comparator configured to compare the first reference voltage to the voltage of the first output terminal to control a cycling of the first switch;
- and
- a second comparator configured to compare the second reference voltage to the voltage of the second output terminal to control a cycling of the second switch.
9 more elements
Dependencies are inferred from the claim text.