52results 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.

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.

The invention discloses a full automatic mixed type reactive power compensation control system and method for a shield tunneling machine. The control system comprises a DSP controller, a fuzzy PI decoupling controller, a capacitor cyclic controller and a reactive power automatic compensation system, wherein the reactive power automatic compensation system comprises a TATCOM and a TSC group. The full automatic mixed type reactive power compensation control method for the shield tunneling machine comprises the steps of enabling the DSP controller to perform reasoning and judging, determining the switching group number of the TSC group and a TATCOM expected output current value, providing a switching signal and a compensation current fixed value, and enabling the TATCOM to receive a PWM signal and to output a feedback current; enabling the TATCOM to provide inductive reactive power and capacitive reactive power with relatively low capacity; and enabling the TSC group to provide high-capacity capacitive reactive power. By combination of the advantages of the TATCOM and the TSC group, stepless regulation of the reactive power can be realized, while power grid voltage drop and voltage fluctuation and resonance between the TSC group and the system can be suppressed; and the control system is low in cost and simple to control, and capable of satisfying dual demands of reactive compensation high capacity and high precision of a power supply system of the large-sized shield tunneling machine.

The invention provides a method for manufacturing separators for batteries. At least the vicinity of the fiber surface of the non-woven fabric is sulfonated, and the sulfonation process includes the pretreatment of exposing the non-woven fabric to a water vapor stream with a nearly saturated humidity. process and the process of immediately exposing the nonwoven fabric subjected to the pretreatment process to an air stream containing SO3 gas, and the nonwoven fabric composed of fibers mainly made of polyolefin resin characterized by the above-mentioned sulfonation process is A method for manufacturing a battery separator based on a base fabric, a separator manufactured by the manufacturing method, and a battery using the separator.

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.

The invention relates to a fuel cell stack structure capable of suppressing a drop in voltage resulting from flooding or contamination at an end in a direction in which cells are laminated, particularly in a cell at a gas outlet / inlet end. In this fuel cell stack structure, a layer which is irrelevant to power generation and in which a gas flow channel is formed is provided at least at a gas outlet / inlet end of a laminated-cell body of a fuel cell such as a solid-polyelectrolyte fuel cell. The layer is constructed of a dummy cell having a gas flow channel but no MEA. In addition, according to this fuel cell stack structure, both a fuel gas flow channel and an oxidative gas flow channel are formed in one face of the layer which is irrelevant to power generation and in which the gas flow channels are formed.

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.

A front substrate (1) and a rear substrate (2) composed of translucent sheets of glass are disposed to face each other with an almost constant interval, and the peripheral portions of the two sheets of glass are bonded together with frit glass (4) via side walls (3) to form a flat discharge container. Fluorescent substance layers (5a, 5b) are formed on the inner sides of the front substrate (1) and the rear substrate (2) to convert a ultraviolet ray emitted from a discharge medium into a visible light. External electrodes (6) for applying high voltage and external electrodes (7) for applying low voltage are alternately arranged on the outer surface of the rear substrate (2). A plurality of slender spacers (8) are arranged between the front substrate (1) and the rear substrate (2) at constant intervals to keep constant the space between the front substrate (1) and the rear substrate (2) and prevent damage due to lamp implosion to be caused by pressure difference between the inside and outside of the discharge container. A linear spacer (8) is disposed so as to be contained within the maximum width of an external electrode (6), and one electrode (6) is apparently divided into two pieces. One electrode (6) is exposed to respective discharge spaces divided by a linear spacer (8), and is allowed to work as electrodes (10) in respective discharge spaces, whereby it is possible to stably light up respective discharge spaces.

The invention provides an electrode material, and a preparation method and application thereof. The preparation method comprises the following steps: respectively dissolving a transition metal salt solution and sodium borohydride in absolute ethyl alcohol to obtain a solution A and a solution B, dispersing a positive electrode material in the solution A to obtain a solution C, slowly adding the solution B into the solution C in a protective gas atmosphere, stirring for reaction after charging is finished, and then filtering, washing and drying to obtain the electrode material. The electrode material has good lattice stability and electrode / electrolyte interface stability at the same time, lattice oxygen loss in the circulation process can be inhibited, and dissolution and migration of transition metal can be inhibited, so that capacity attenuation and voltage drop of the positive electrode material in the circulation process are relieved, and the problems of high surface alkalinity, poor rate capability, serious attenuation of capacity and voltage in the cycle process and the like of the existing positive electrode material are effectively solved.