53results about How to "Suppress voltage drop" patented technology

The invention provides a motor driving apparatus that supplies energy to a motor so that the peak of the input current from a power supply to the motor can also be suppressed when particularly large energy is needed during the second half period of motor acceleration. A motor driving apparatus 1 having a converter 2, which receives AC voltage and converts it to DC power, and an inverter 3, which receives the DC power and converts it to AC power, includes a charge / discharge control circuit 7 and a capacitor 8 connected in parallel to a link section between the converter 2 and the inverter 3, and energy stored in the capacitor C8 is charged and discharged at arbitrary timing by the charge / discharge control circuit 7.

The invention provides a liquid ejecting head, a liquid ejecting head unit, and a liquid ejecting apparatus, which can suppress a crosstalk between piezoelectric elements and through a partition wall, as well as a voltage drop, thereby suppressing deviation of ink droplet landing position and stabilizing liquid ejection characteristic, thus contributing to improving printing quality. The piezoelectric element includes a first electrode serving as an individual electrode, a piezoelectric layer, and a second electrode serving as a common electrode is attached on a face of a flow path substrate via a vibrating plate. A piezoelectric active portion defined by the first electrode and the second electrode serving as a substantial driver of the piezoelectric element is provided in a region opposing the pressure chamber. An opening formed by removing the second electrode and the piezoelectric layer is provided in a region of the piezoelectric element opposing the partition wall. A wiring electrode and the second electrode provided on the flow path substrate are connected via a common lead electrode provided on the piezoelectric active portion, and the common lead electrode is provided at least on the partition wall inside the opening.

The invention provides an application method of a battery utilizing a lithium-rich manganese-based solid solution material as a positive electrode. The method comprises the following steps: performing electrochemical charging and discharging activation treatment on the battery utilizing the lithium-rich manganese-based solid solution material as the positive electrode; performing charging and discharging circulation on the activated battery, wherein the cut-off voltage of the battery subjected to charging and discharging circulation is less than the charge cut-off voltage during the activation treatment. According to the method provided by the invention, the lithium-rich manganese-based solid solution material releases full capacity by virtue of activating, a layer structure is transformed into a spinel structure quickly, and then the battery can be subjected to charging and discharging circulation in a mild condition, and the material still has higher capacity under a lower charging cut-off voltage. Meanwhile, in the mild condition, the un-removed lithium ion plays a role in supporting the structure, so that the lithium-rich manganese-based solid solution material keeps a stable structure in the process of electrochemical cycling, without obvious voltage falling, and thus voltage attenuation is restrained effectively.

A characteristic selection / current upper limit value calculation section 64 selects a cranking upper limit characteristic map MP2 in the case where a cranking state is detected by a cranking state supposition section 63, and selects a non-cranking upper limit characteristic map MP1 in the case where the cranking state is not detected. Upper limit limitation on a current caused to pass through a motor 20 is relaxed in a cranking upper limit characteristic as compared with a non-cranking upper limit characteristic. Consequently, it is possible to prevent excessive current limitation during cranking.

A power conversion method of a power conversion device including a plurality of primary side ports disposed in a primary side circuit and a plurality of secondary side ports disposed in a secondary side circuit magnetically coupled to the primary side circuit with a transformer, the power conversion device adjusting transmission power transmitted between the primary side circuit and the secondary side circuit by changing a phase difference between switching of the primary side circuit and switching of the secondary side circuit, the power conversion method including: calculating a transmission efficiency setting an adjustment value of the phase difference to a value obtained by dividing the transmission efficiency by a specified efficiency; and setting the phase difference to a value obtained by dividing the calculated value by the adjustment value when the adjustment value is less than the specified value.

A printing method that can suppress drops in voltage due to discharging of piezo elements is achieved. A printing method includes: generating a drive signal for driving a piezo element by selecting, based on print data, either a first original drive signal having a unit signal for defining the start to the end of an operation of causing the piezo element to eject ink by changing a voltage of the piezo element using a first reference voltage as a reference, or a second original drive signal having a unit signal for defining the start to the end of an operation of causing the piezo element to eject ink by changing the voltage of the piezo element using a second reference voltage as a reference; ejecting ink using the piezo element by applying the generated drive signal thereto to charge / discharge the piezo element; and charging the piezo element so that the voltage thereof attains either the first or second reference voltage during a predetermined period during which neither the first nor the second original drive signal is selected.