4 results about "Frequency scaling" patented technology

This application discloses a scalar control method and apparatus for a brushless DC motor. The method includes: obtaining the motor operating frequency feedback value for the current control cycle based on t1(ZC) and t0(ZC); extracting the high-frequency component from the motor operating frequency feedback value for the current control cycle; obtaining the dynamic correction amount of the emission frequency to be superimposed; calculating the low-frequency component from the motor operating frequency feedback value for the current control cycle; generating the adaptive frequency scaling factor and the voltage correction amount for the current control cycle; and generating the motor drive control signal for the current control cycle. Compared to other scalar control schemes, this scheme can effectively improve the dynamic and steady-state performance of the brushless DC motor. Furthermore, this scheme has a smaller computational load and lower hardware implementation cost, requiring only at least one phase of motor output voltage as an analog comparator input for obtaining the zero-crossing signal of the motor back EMF voltage, without the need for analog sampling.

The disclosed techniques provide a dynamic voltage and frequency scaling (DVFS) module and a domain residing in a core. The DVFS module includes a Voltage and Memory Assist Table (VMAT), including firmware-programmable registers that store target voltages that correspond to performance states and firmware-programmable registers that store memory assist values that correspond to the performance states. The domain includes memories. The DVFS module is configured to, during a current performance state: provide a core voltage to the domain, such that the core voltage is provided based on a target voltage among the target voltages that corresponds to the current performance state, and provide memory assist signaling to the memories, such that the memory assist signaling is provided based on the memory assist values that correspond to the current performance state. The DVFS module uses an efficient crawl to transition memory assist values from one performance state to another performance state.

A method for memory management is described. The method includes detecting a mobile device entering a deep sleep state. The method also includes monitoring a lag counter for entering the deep sleep state with respect to a time period that the mobile device is in the deep sleep state to calculate a lag statistic threshold. The method further includes comparing the lag statistic threshold to a threshold configuration value. The method also includes adjusting memory management and / or frequency scaling of the mobile device when the lag statistic threshold is greater than the threshold configuration value.

The application relates to the technical field of master-slave data interaction, in particular to a cross-domain circuit and method supporting dynamic voltage or frequency adjustment, which comprises a host cross-domain circuit and a slave cross-domain circuit connected in sequence, the host cross-domain circuit is connected with an upstream host device, and the slave cross-domain circuit is connected with a downstream slave device; the host cross-domain circuit comprises a distribution control circuit, a first state controller, a first transaction blocking circuit and a sending module; the slave cross-domain circuit comprises a second state controller, a second transaction blocking circuit and a receiving module; the host cross-domain circuit and the slave cross-domain circuit are completely separated from different clock domains, reset domains and power domains, the circuit is more easily realized on a large-scale high-speed chip, and the system is convenient to control; the distribution control circuit, the first state controller and the first transaction blocking circuit work cooperatively to support an error response function and a blocking function of a protocol data transmission channel, and better safety of the system can be provided.