Voltage control utilizing multiple PWM patterns
地域：
NY
NY Armonk
摘要
A power-delivery system may comprise a load device and a direct-current converter configured to deliver current to the load device when the direct-current converter is in an on state. The power-deliver system may comprise a voltage-measurement system configured to measure, at a beginning of each measurement cycle in a cyclic measurement pattern, a voltage at the load device. The power-deliver system may comprise a power controller configure to receive, at the beginning of each measurement cycle, the measurement of the voltage, and to perform, at the beginning of a control cycle in a cyclic control pattern, a voltage-control decision in response to a change in the measurement of the voltage being below a voltage-change threshold. The voltage-control decision may comprise whether to switch the state of the first direct-current converter. The cyclic control pattern may operate at a first frequency, and the measurement pattern may operate at a second frequency.
說明書
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This invention was made with Government support under contract number B604142, awarded by the Department of Energy. The Government has certain rights to this invention.
The present disclosure relates to electronic power supply, and more specifically, to voltage regulation management.
Typical solutions for voltage regulation management in electronic power supply involve issuing commands to power converters according to a cyclic pulse-width-modulation (PWM) pattern. Solutions utilizing PWM patterns with large cycle periods are limited in their ability to respond quickly to potentially damaging changes in voltage. Solutions utilizing PWM patterns with small cycle periods are often inefficient.
權(quán)利要求
What is claimed is:1. A power-delivery system comprising:a load device; a first direct-current converter configured to deliver current to the load device when the first direct-current converter is in an on state; a voltage measurement system configured to measure, at a beginning of each measurement cycle in a first cyclic measurement pattern, a voltage at the load device; and a first power controller configured to:receive, at the beginning of each measurement cycle, the measurement of the voltage; and perform, at the beginning of a first control cycle in a first cyclic control pattern, a first voltage-control decision in response to a first change in the measurement of the voltage being below a voltage-change threshold, wherein the first voltage-control decision comprises a decision of whether to switch the state of the first direct-current converter; wherein the first cyclic control pattern operates at a first frequency, wherein the first cyclic measurement pattern operates at a second frequency that is a first positive-integer multiple of the first frequency, wherein the first positive-integer multiple is greater than 1, and wherein the beginning of the first control cycle coincides with the beginning of a measurement cycle. 2. The power-delivery system of claim 1 , wherein the first voltage-control decision further comprises:a decision to switch the first direct-current converter to the on state or maintain the first direct-current converter in an on state; and a decision regarding the length of time to maintain the on state of the first direct-current converter. 3. The power-delivery system of claim 1 , wherein the system is further configured to:perform, at a beginning of a second control cycle in a second cyclic control pattern, a second voltage-control decision in response to a second change in the measurement of the voltage being above the voltage-change threshold; wherein the second cyclic control pattern operates at a third frequency that is a second positive-integer multiple of the first frequency, wherein the positive-integer multiple is greater than 1, and wherein the beginning of the second control cycle coincides with the beginning of a measurement cycle. 4. The power-delivery system of claim 3 , wherein the second voltage-control decision is performed by the first power controller. 5. The power-delivery system of claim 3 , wherein the second voltage-control decision is performed by a second power controller. 6. The power-delivery system of claim 3 , wherein the second voltage-control decision overrides the first voltage-control decision. 7. The power-delivery system of claim 3 , wherein the second positive-integer multiple is not the same as the first positive-integer multiple. 8. The power-delivery system of claim 3 , further comprising:a second direct-current converter configured to deliver current to the load device when the second direct-current converter is in an on state; wherein the second voltage-control decision comprises a decision to switch the first direct-current converter and the second direct-current converter to the on state at the beginning of the second control cycle and a decision regarding the length of time to maintain the on states of the first direct-current converter and the second direct-current converter. 9. The power-delivery system of claim 3 , wherein the second voltage-control decision comprises a decision to increase the third frequency. 10. A method of controlling a voltage at a load device, the method comprising:measuring, at the beginning of a first cycle in a first cyclic measurement pattern, a first voltage at the load device; detecting, based on the first voltage, a first change in the voltage; determining that the first change in the voltage is below a voltage-change threshold; controlling, based on the determining that the first change in voltage is below the voltage-change threshold, the voltage according to a first cyclic control pattern; measuring, at the beginning of a second cycle in the first cyclic measurement pattern, a second voltage at to the load device; detecting, based on the second voltage, a second change in the voltage; determining that the second change in the voltage is above a voltage-change threshold; and controlling, based on the determining that the second change in voltage is above the voltage-change threshold, the voltage according to a second cyclic control pattern; wherein the first cyclic control pattern operates at a first frequency and the first cyclic measurement pattern and the second cyclic control pattern operate at a second frequency that is a first positive-integer multiple of the first frequency, wherein the first positive-integer multiple is greater than 1. 11. The method of claim 10 , wherein controlling the voltage according to the first cyclic control pattern comprises:deciding to switch a first direct-current converter to a first state for a first amount of time; and switching the first direct-current converter to the first state. 12. The method of claim 11 , wherein switching the first direct current converter to the first state comprises maintaining the direct current converter in an off state, and wherein controlling the voltage according to the second cyclic control pattern comprises switching the first direct current converter to the on state before the expiration of the first amount of time. 13. The method of claim 10 , wherein the voltage is controlled according to the first and second cyclic control patterns by a first voltage controller. 14. The method of claim 10 , wherein the voltage is controlled according to the first cyclic control pattern by a first voltage controller, and wherein the voltage is controlled according to the second cyclic control pattern by a second voltage controller. 15. The method of claim 14 , wherein the first voltage controller measures the voltage at the beginning of a third cycle in a second cyclic measurement pattern, wherein the second measurement pattern operates at the first frequency. 16. The method of claim 10 , wherein controlling the voltage according to the first cyclic control pattern comprises performing a first voltage-control decision, and wherein controlling the voltage according to the second cyclic control pattern comprises overriding the first voltage-control decision. 17. The method of claim 10 , wherein controlling the voltage according to the second cyclic control pattern comprises:a second voltage-control decision to override the first voltage-control decision; and a third voltage-control decision to switch the state of a direct-current converter. 18. A voltage controller configured to:measure, at the beginning of a first measurement cycle in a cyclic measurement pattern, a first voltage at a load device; measure, at the beginning of a second measurement cycle in the cyclic measurement pattern, a second voltage at the load device; detect a first rate of change in voltage based on the first and second voltages; determine that the first rate of change in voltage is below a first voltage-change threshold; and control, based on the determining, the voltage according to a steady-state cyclic control pattern; wherein the cyclic measurement pattern operates at a first frequency, the steady-state cyclic control pattern operates at a second frequency, and the first frequency is a first positive-integer multiple of the second frequency, wherein the first positive-integer multiple is greater than 1. 19. The voltage controller of claim 18 , wherein the voltage controller is further configured to:detect a second rate of change in voltage; determine that the second rate of change is above the first voltage-change threshold but below a second voltage-change threshold; and control, based on the determining that the second rate of change is above the first voltage-change threshold but below a second voltage-change threshold, the voltage according to a first oversampling control pattern; wherein the first oversampling control pattern operates at a third frequency that is between the first frequency and the second frequency. 20. The voltage controller of claim 19 , wherein the voltage controller is further configured to:detect a third rate of change in voltage; and determine that the third rate of change is above the second voltage-change threshold; and control, based on the determining that the third rate of change is above the second voltage-change threshold, the voltage according to a second oversampling control pattern; wherein the second oversampling control pattern operates at the first frequency.
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