摘要:
A quasi-resonant PWM inverter performs stable resonant operation utilizing a simple control system and a highly efficient inverter operation. A first condenser is connected between a connecting point between first and second main switches and to the first side of the first main switch. A second condenser is connected between the connecting point and the second side of the second main switch. The respective first and second sides of the first main switch and second main switch are connected to a DC power source having a first dividing point for the first potential and a second dividing point for the second potential. A terminal of a first auxiliary switch is connected to the first dividing point; and a terminal of a second auxiliary switch is connected to the second dividing point. A reactor is connected between the connecting points of the first and second auxiliary switches and the first and second main switches.
摘要:
A direct current power unit has main and secondary direct current power supplies, a serial circuit, and first and second parallel circuits. One terminal of the secondary direct current power is connected to one terminal of the main direct current power supply. The serial circuit consists of a choke coil and a first capacitor, of which each terminal is connected to each terminal of the main direct current power supply. The first parallel circuit consists of a first diode and a first switching element, of which each terminal is connected to each terminal of the first capacitor. The second parallel circuit consists of a second capacitor, a second diode, and a second switching element connected between the serial connected point of the choke coil and the first capacitor and the other terminal of the secondary direct current power supply. Each terminal of a third capacitor is connected to each terminal of the secondary direct current power supply. Direct current power is supplied to a load from each terminal of the first capacitor.
摘要:
A nonaqueous electrolyte lithium secondary cell comprising a positive electrode (1), a negative electrode (2) and a nonaqueous electrolyte containing a lithium salt is characterized by that the nonaqueous electrolyte contains a room temperature molten salt as a main component, a material wherein a working potential of the negative electrode (2) is nobler by above 1V than a potential of a metallic lithium is used for a negative active material of the negative electrode. This nonaqueous electrolyte lithium secondary cell has excellent safety and cell performance.
摘要:
A life indicator is so designed that an electric current flows to a light emitting diode utilizing a battery as a power source when two electrodes are electrically connected. The two electrodes are so installed as to be electrically connected by passing water through a water passage communicating with an objective equipment, and the discharge life of the battery is set equal to the service life of the equipment.
摘要:
A sulfuric acid concentration sensor for a lead storage battery comprising a quartz resonator changing its characteristic frequency in a manner of single-valued function according to the change of sulfuric acid concentration and an oscillation circuit (20) oscillating the quartz resonator, the quartz resonator is immersed in an electrolyte (6) so as to be oscillated, and a characteristic frequency of the quartz resonator at this moment is obtained so as to determine the sulfuric acid concentration. The sensor of this invention is compact in its size, simple in its structure and cheap in its cost, so that it can be applied to a lead storage battery for automobile.
摘要:
A dehydrator comprising a filter press including a pair of first and second, electrically insulating press plates supported in parallel on a frame and adapted to be moved relative to each other. Each of the press plates has a wide recess, the recesses forming a closed space between them when they engage. A pair of filter cloths for enclosing feed liquid are provided between the plates. An electricaly insulating diaphragm is fixed at its margin to the first press plate, covers the associated recess, and is adapted to swell outwardly with compressed fluid collected between the diaphragm and the first plate. A metal core plate is embedded within the diaphragm to reinforce it except for its marginal portion, and the core plate is connected to one of the positive and negative poles of an electric DC power source. Electric conductors are fixed in electric connection to the core plate, and project outwardly through the diaphragm. Divided flush carbon electrode plates are fixed in electric connection to the conductors over the diaphragm and core plate. Another electrode plate is supported in the recess of the second press plate in parallel with the divided electrode plates, and connected to the other electric pole.
摘要:
An apparatus for separating particles in accordance with the sphericity of the particles is disclosed. The apparatus includes a housing which is supplied with air having a desired humidity, and which accommodates therein a cylindrical rotor with a horizontal shaft. The particles are charged into the housing from a hopper above the rotor, and tend to adhere onto the peripheral surface of the rotor with adhesive force which is dependent on the sphericity of each particle. The rotor is placed into a slow rotation and subjected to vibration whereby non-spherical particles and spherical particles are collected in respective receptacles arranged on both sides of the rotor shaft.
摘要:
The purpose of this invention is to provide a life indicator which can detect an occurrence of growth and obtain various information based on it. A life indicator of this invention having at least a sensor portion, a sending circuit, a receiving circuit and a light emitting diode. The sensor portion is adapted to be applied with a pressure based on an elongation of a positive plate directly or indirectly, so as to detect the applied pressure as a change of electric parameter.
摘要:
This disclosure relates to a process and apparatus for electroosmotic dehydration of sludge with aluminum salt added to the sludge to reduce the clogging of the filter cloths of the dehydrator, and to improve the cake release. The aluminum salt is preferably polyaluminum chloride.
摘要:
A sulfuric acid concentration sensor including a sensor body comprising a high molecular compound having a property to react with sulfuric acid and a property to change an electric conductivity in such a way as one-valued function with a change in sulfuric acid concentration, in which an electric current is flown through the sensor body impregnated in sulfuric acid solution to obtain the electric conductivity of sensor body so as to know the sulfuric acid concentration. Since the electric conductivity of high molecular compound changes corresponding to the sulfuric acid concentration, the sulfuric acid concentration can be known when the electric conductivity of the sensor body i.e. the high molecular compound is obtained, so that the concentration of sulfuric acid can be measured easily.