Abstract: In a full bridge type DC-DC converter, a first protective diode is connected between a first node between a first resonance inductor on a primary side and one terminal of a primary winding of a transformer, and a power line on a high voltage side of a power supply. A second protective diode is connected between the first node and a power line on a low voltage side of the power supply. A third protective diode is connected between a second node between a second resonance inductor and the other terminal of the primary winding, and the power line on the high voltage side of the power supply. A fourth protective diode is connected between the second node and the power line on the low voltage side of the power supply.

Abstract: In a control device, comprising a plurality of base components connected to one another in series by a composite signal line including a plurality of address signal lines, a control unit fitted onto one of said base components, and a plurality of controlled units adapted to be controlled by said control unit and each fitted onto a selected different one of the remaining base components, the control unit selects one of the address signal lines in the composite signal line, and produces an address signal thereon. The base components associated with the controlled units are provided with respective terminators each corresponding to one of the address signal lines, and these terminators are connected to the corresponding controlled units while the remaining address signal lines are simply passed on. Thereby, the addresses of controlled units are allowed to be automatically set up by the control unit.

Abstract: An oil burner of the heat radiation type is disclosed which is capable of effectively preventing clouding of the inner surface of a heat-permeable cylinder with moisture, contaminants contained in combustion gas such as soot and tar, and the like during at the ignition and combustion operation.The oil burner includes a communicating means for establishing the communication between an air supply passage and a space between a heat-permeable cylinder and an outer combustion cylinder, which comprises a top plate for a pot having through-holes formed at the portion thereof above the air supply passage and a top plate for a housing having through-holes formed at the portion below the space, to thereby allow air to be introduced directly from the air supply passage to the space and upward flow along the inner surface of the heat-permeable cylinder.

Abstract: A safety device for a pot-type oil burner is disclosed which is capable of efficiently and rapidly detecting the decrease of oxygen concentration in a room due to combustion to provide a warning and/or stop the combustion by sensing the decrease in temperature of a bottom portion of a pot. The safety device includes a thermo-sensitive device arranged on the outer surface of the bottom portion of the pot which is apart from the bottom region of the pot in which occurs the vaporization of fuel oil supplied to the pot.

Abstract: A pot-type oil burner is disclosed which is capable of effectively preventing the generation of bad odor and soot during the igniting operation by turning on an electric heater positioned above a heat-resistant fabric spread on the bottom surface of a pot to previously heat the pot and fabric to a temperature sufficient to vaporize fuel oil prior to introducing fuel oil to the pot by means of a nozzle pipe.

Abstract: A pot-type oil burner is disclosed which is capable of stabilizing the vaporization rate of fuel oil in a pot to accomplish the stable complete combustion with a good efficiency. The oil burner is constructed to arrange a heat-resistant fabric on the bottom surface of the pot to vaporize fuel oil with a constant rate. The oil burner is also capable of significantly reducing retention of tar in the pot and facilitates removing tar from the pot as desired.