Abstract:
A bidirectional DC/DC converter includes a bidirectional DC/AC conversion circuit including a push-pull circuit connected between voltage terminals and a winding and having a switching element and a switching element coupled to opposing ends of the winding respectively, and an up-conversion circuit coupled to the push-pull circuit and the voltage terminals and the up-conversion circuit includes an inductor for allowing passage of a current through the winding, the switching element in an ON state and the switching element in an ON state owing to stored magnetic energy, and a switching element forming a current path going through the voltage terminal, the inductor and the voltage terminal but not through the switching element and the switching element as it is turned on.
Abstract:
An electric power supply system is provided for feeding an output of a DC power source to a load at high efficiency and, without complicated controlling, for allowing for interchange of electric power among a commercial power system, a DC power source and a load.An electric power supply system includes a DC bus line for connecting a DC generator, a load and system power. The electric power supply system comprises a DC/DC converter connected between the DC generator and the DC bus line for controlling an output voltage to the DC bus line at a voltage V1; an inverter connected between the system power and the DC bus line for operating a control in response to an input voltage V2 from the DC bus line; and an AC/DC converter connected between the system power and the DC bus line for controlling an output voltage to the DC bus line at a voltage V3, wherein the respective voltages are set as V1>V2>V3.
Abstract:
An electric power supply system is provided for feeding an output of a DC power source to a load at high efficiency and, without complicated controlling, for allowing for interchange of electric power among a commercial power system, a DC power source and a load.An electric power supply system includes a DC bus line for connecting a DC generator, a load and system power. The electric power supply system comprises a DC/DC converter connected between the DC generator and the DC bus line for controlling an output voltage to the DC bus line at a voltage V1; an inverter connected between the system power and the DC bus line for operating a control in response to an input voltage V2 from the DC bus line; and an AC/DC converter connected between the system power and the DC bus line for controlling an output voltage to the DC bus line at a voltage V3, wherein the respective voltages are set as V1>V2>V3.
Abstract:
A power supply system capable of smoothing photovoltaic generation output, and enabling time shift is provided. A power supply system including a DC power supply string in which a storage battery is connected in parallel to a DC power supply; and a DC/AC power conversion device for connecting the DC power supply string to a power system or a load is provided. A switch is connected between the DC power supply and the storage battery, where an output power of the DC power supply or a combined output power of the DC power supply and the storage battery is switched and supplied to the DC/AC power conversion device by the switch. The photovoltaic generation output is thereby smoothed, and time shift is enabled.
Abstract:
There is provided a control apparatus that instantaneously switches a DC/DC converter from a maximum-power-point tracking operation to an output voltage control operation, and can constantly supply an electric power to a load.The control apparatus includes a first electric power supply device, a second electric power supply device that operates as a voltage source and has a supply voltage changing depending on conditions, an electric power converter that converts electric powers of the first electric power supply device and the second electric power supply device into desired electric powers, a monitoring unit that acquires device information of the second electric power supply device and output information of the electric power converter, and a control unit that controls the electric power converter on the basis of the information acquired by the monitoring unit.
Abstract:
The present invention intends to provide a manufacturing method of a heat resistant micro-lens. The manufacturing method includes forming on a substrate an inorganic film having the optical transparency; forming, at positions that are on the inorganic film and correspond to lens formation positions, a resist films; etching a portion where the resist films are not formed of the inorganic film; removing the resist films that remain; and irradiating inert gas ions to the inorganic film from which the resist films are removed and that is patterned according to the etching.
Abstract:
Amino- or guanidino-1,2,3,4-tetrahydro-1-naphthoic esters represented by the formula, ##STR1## wherein R.sub.1 is --NH.sub.2 or ##STR2## R.sub.3 is --H, --R.sub.4, --O--R.sub.4, --NHCOCH.sub.3, a halogen, --CN, ##STR3## --COOH, --COOR.sub.4, ##STR4## or --(CH.sub.2).sub.n --COOCH.sub.2 --CO--R.sub.5 ; R.sub.5 is --O--R.sub.4, --NH.sub.2 or ##STR5## n is 0, 1 or 2, and R.sub.4 is a lower alkyl, or pharmaceutically acceptable acid addition salts thereof. Owing to their inhibitory activity on proteolytic enzymes the said esters and acid addition salts thereof are useful in the therapy of diseases caused by such enzymes.
Abstract:
A bidirectional DC/DC converter includes a bidirectional DC/AC conversion circuit including a push-pull circuit connected between voltage terminals and a winding and having a switching element and a switching element coupled to opposing ends of the winding respectively, and an up-conversion circuit coupled to the push-pull circuit and the voltage terminals, and the up-conversion circuit includes an inductor for allowing passage of a current through the winding, the switching element in an ON state and the switching element in an ON state owing to stored magnetic energy, and a switching element forming a current path going through the voltage terminal, the inductor and the voltage terminal but not through the switching element and the switching element as it is turned on.
Abstract:
A secondary battery protection circuit has: a first switch that permits or inhibits charging of a secondary battery by switching a charge conductor between a conducting and a non-conducting state; a voltage detection portion that monitors the voltage of the secondary battery to output an error signal when the voltage is an overvoltage; and a first current path that has one end connected to the positive-side conductor and the other end connected to the negative-side conductor, and through which a current corresponding to the supplied electric power passes. The first current path, other than during charging of the secondary battery, is kept in a non-conducting state and, when the error signal is outputted while the first current path is in a conducting state, is irreversibly brought into a non-conducting state by a current of a predetermined amount or more passing therethrough. The first switch, when the first current path is in a conducting state, permits charging and, when the first current path is in a non-conducting state, inhibits charging. Thus, other than during charging, electric power consumption associated with overcharge protection is reduced, and once an overcharged state occurs, charging never again takes place.
Abstract:
A power supply system capable of smoothing photovoltaic generation output, and enabling time shift is provided. A power supply system including a DC power supply string in which a storage battery is connected in parallel to a DC power supply; and a DC/AC power conversion device for connecting the DC power supply string to a power system or a load is provided. A switch is connected between the DC power supply and the storage battery, where an output power of the DC power supply or a combined output power of the DC power supply and the storage battery is switched and supplied to the DC/AC power conversion device by the switch. The photovoltaic generation output is thereby smoothed, and time shift is enabled.