Method and apparatus for sequencing outputs in a multi-output power converter system
First Claim
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1. A method of sequencing output voltages in a multi-output switch-mode converter system comprising:
- providing a power source to a primary of the multi-output switch-mode converter system;
transferring energy from the primary to a highest voltage secondary output so as to increase a voltage of the highest voltage secondary output;
transferring energy from the primary to a lowest voltage secondary output so as to concurrently increase a voltage of the lowest voltage secondary output while regulating the voltage of the highest voltage secondary output, the voltage of the highest voltage secondary output greater than the voltage of the lowest voltage secondary output; and
transferring energy from the primary to the highest voltage secondary output and the lowest voltage secondary output so as to concurrently increase the voltage of the highest voltage secondary output and the voltage of the lowest voltage secondary output.
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Abstract
Apparatus and methods for sequencing outputs in a multi-output power converter system are disclosed herein. During start-up multiple CC/CV outputs may be sequenced so that energy is first provided to a highest voltage secondary output and subsequently provided to a lowest voltage secondary output. Additionally, control may be exerted so as to concurrently and monotonically increase voltages during at least part of the start-up transient; and concurrent control may be further implemented using control circuitry and a variable reference generator. In some embodiments a variable reference may be generated from a capacitor voltage.
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Citations
40 Claims
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1. A method of sequencing output voltages in a multi-output switch-mode converter system comprising:
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providing a power source to a primary of the multi-output switch-mode converter system; transferring energy from the primary to a highest voltage secondary output so as to increase a voltage of the highest voltage secondary output; transferring energy from the primary to a lowest voltage secondary output so as to concurrently increase a voltage of the lowest voltage secondary output while regulating the voltage of the highest voltage secondary output, the voltage of the highest voltage secondary output greater than the voltage of the lowest voltage secondary output; and transferring energy from the primary to the highest voltage secondary output and the lowest voltage secondary output so as to concurrently increase the voltage of the highest voltage secondary output and the voltage of the lowest voltage secondary output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A multi-output power converter configured to provide power to multiple loads, the multi-output power converter comprising:
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a system control module; a transformer comprising a primary coil and a stacked secondary coil having a plurality of stacked secondary outputs, the primary coil electrically coupled to receive energy from a first power supply; and a secondary switches block electrically coupled to the plurality of stacked secondary outputs and comprising a plurality of outputs, the plurality of outputs comprising a highest voltage output and a lowest voltage output; wherein during a start-up transient prior to reaching a steady state, the system control module is configured to control a transference of energy from the primary coil to the plurality of outputs such that during an initial soft-start phase, a voltage of the highest voltage output increases monotonically before a voltage of the lowest voltage output increases, and during a subsequent ramping phase, the voltage of the highest voltage output rises concurrently with the voltage of the lowest voltage output. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of sequencing a plurality of output voltages from an off-state to an operational steady-state in a multi-output power converter system, wherein the plurality of output voltages comprise a lowest voltage output and a highest voltage output, the method comprising:
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providing a power source to a primary of the multi-output power converter system; starting the multi-output power converter system in a soft-start mode, wherein starting the multi-output system converter system in the soft-start mode comprises; increasing a voltage of the highest voltage output in the soft-start mode; regulating the voltage of the highest voltage output in the soft-start mode; increasing a voltage of the lowest voltage output in the soft-start mode; and controlling the plurality of output voltages in a ramping mode, wherein controlling the plurality of output voltages in the ramping mode comprises; concurrently increasing the voltage of the lowest voltage output with the voltage of the highest voltage output. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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Specification