Digital multiphase control system
A multi-phase control system for a power supply provides a data bus between a controller and multiple phase drivers to obtain a synchronous control through a flexible and non-dependent control configuration. The controller provides data signals to the data bus that is connected to the various phase drivers, with the data signals dependent upon a switching frequency and ON/OFF command signals for a particular phase. Each of the phase drivers have decoding logic for receiving the data signals over the data bus, as well as independent selection or addressing logic for choosing the phase driver to react to the data signals on the data bus. A variety of control configurations may be realized according to this control technique including resetting all drivers, setting all phases to ON or all phases to OFF conditions, skipping phase activation and so forth. The flexible control permits output current sharing to be controlled among the various phases to provide a desired output current for the power supply. The control configuration permits fast and robust response to transient conditions while providing a simplified control in an N phase system over a data bus that can vary between 1 and M lines.
1. A multi-phase power control system, comprising:
a controller for controlling a plurality of phase drivers that control an output voltage of the multi-phase power control system and having control logic to generate data signals for application to each of the plurality of phase drivers;
each phase driver providing a switching signal to control power flow in the power control system, the data signals being applied to the phase driver, and wherein each phase driver has a unique address;
control logic in each phase driver for selection of the phase driver to act on data signals applied to the phase driver from the controller, wherein the control logic in each phase driver selects the phase driver to act on the data signals based on the unique address of the phase driver and by performing a counting operation on the data signals from the controller.
2. The power controller according to claim 1 , wherein the control logic in the controller includes a counter and an output supplying at least one of the data signals.
3. The power controller according to claim 1 , wherein the control logic in each phase driver includes a counter for contributing to selecting the phase driver.
4. The power controller according to claim 1 , further comprising a PWM component in the controller.
5. The power controller according to claim 4 , further comprising a current sharing signal supplied from each phase driver to the PWM component to contribute to adjusting current sharing among the plurality of phase drivers.
6. A method of controlling a multi-phase power supply, comprising:
generating a data signal in a controller related to switching a phase of the power supply;
applying the data signal to a phase driver to permit the phase driver to switch a phase in accordance with the data signal when selected; and
controlling the phase driver to be selected according to a particular addressing configuration, whereby the phase driver is operable to switch the phase when selected based on a counting operation performed on the applied data signal and on the particular addressing configuration.
7. The method according to claim 6 , further comprising counting pulses in the controller to determine values for the data signals.
8. The method according to claim 6 , further comprising counting events in the phase driver to provide a scheduled selection of the phase driver for receiving and acting on the data signal from the controller.
9. The method according to claim 6 , further comprising:
supplying a current sharing feedback signal from the phase driver to the controller; and
modifying the data signals by altering the timing to permit the phase driver to supply current in accordance with a current sharing configuration.
10. The method according to claim 9 , wherein modifying the data signals comprises altering the timing of the data signals.
11. A multi-phase power supply control, comprising:
a phase driver for switching a phase of a multi-phase power supply, wherein the phase driver has a unique address;
a set of logic components in the phase driver for selecting the phase driver and reacting to control input supplied to the phase driver, wherein the set of logic components selects the phase driver based on the unique address of the phase driver and by performing a counting operation on the control input;
a data bus coupled to the phase driver for supplying the control input to the phase driver;
a controller coupled to the data bus for supplying the control input applied to the phase driver through the data bus; and
control logic in the controller for monitoring periodic events and generating the control input to the data bus based on a predetermined control configuration, whereby the phase driver realizes the predetermined control configuration when selected.