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Voltage control utilizing multiple PWM patterns

專利號
US10097090B1
公開日期
2018-10-09
申請人
International Business Machines Corporation(US NY Armonk)
發(fā)明人
Andrew Ferencz; Todd E. Takken; Paul W. Coteus; Xin Zhang
IPC分類
G05F1/00; H02M3/158; H02M1/36; H02P9/30; H02M1/08; H02M1/00
技術(shù)領(lǐng)域
voltage,steady,controller,converter,pwm,may,cyclic,pattern,in,cycle
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

Continuing the previous example, the voltage controller may take a second voltage measurement at time 208 according to oversampling cyclic PWM pattern 202 (i.e., the voltage controller may measure the voltage again at the start of the second cycle of pattern 202). If the voltage controller identifies a slight decrease in voltage, but determines that the change in voltage is below a voltage-change threshold, the voltage controller may determine to respond to the change by controlling the voltage at the beginning of the next cycle in the steady-state pattern, which occurs at time 210. This may, therefore, involve waiting until time 210 to command the second converter to pulse for slightly longer (e.g., a duty cycle of 16%, representing a pulse for the first 16% of the PWM cycle from the perspective of the second converter) according to the steady-state pattern. This decision would be in lieu of issuing a second command to the first converter to pulse again at time 208 (which would involve controlling the voltage according to the oversampling pattern).

At time 210 the voltage controller again measures the voltage of the system, and determines to send a command to the second converter to pulse for a 16% duty cycle, as planned. This 16% duty cycle is represented by pulse 224. In some embodiments, the determination to send a command to pulse for 16% (as opposed to, for example, 18%) may be based entirely on the measurement collected at time 210. However, in other embodiments a voltage controller may incorporate other recent voltage measurements as well, in order to identify a pattern of recent voltage change on which the determination could be based. For example, a voltage controller may incorporate the measurements from time 210 and 208.

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