Abstract: A capacitive isolation type power conversion device includes a primary side circuit, which includes switching elements, a first connection line and a second connection line, which are connected to the primary side circuit, a first capacitor provided on the first connection line, a second capacitor provided on the second connection line, a third connection line, an excitation inductor provided on the third connection line, a secondary side circuit, and a control circuit. The control circuit controls a switching frequency, thereby controlling an output voltage, which is a voltage of DC power output from the secondary side circuit.

Abstract: Provided is a drive circuit 1 including: a switching unit 3 including a first transistor Tr1 that constitutes an upper arm, and a second transistor Tr2 that is connected to the first transistor Tr1 in series and constitutes a lower arm; and a drive power supply 5 in which a positive electrode is connected to a gate terminal of the first transistor Tr1 and a negative electrode is connected to a source terminal of the second transistor Tr2.

Abstract: Of a gas detector 100, a chamber 105 formed between a center cover 150 and a cover 160 is a part of an air flow channel AF. A first shielding plate 165 is provided in the chamber 105. Water droplets that have entered the chamber from a chamber entrance 103 with air hit and adhere to an entrance-opposed surface 165E of the first shielding plate 165. The water thus adhering to the surface is pushed by the air flowing along the entrance-opposed surface 165E and by gravity, to thereby advance downward. The water then drips downward and is accumulated on a bottom wall surface 105WD which serves as an upper surface of a bottom wall section 161WD. The water is pushed by the flow of air, to thereby advance toward a chamber exit 104. The water is then drained downward from the chamber exit 104.

Abstract: Of a gas detector 100, a chamber 105 formed between a center cover 150 and a cover 160 is a part of an air flow channel AF. A first shielding plate 165 is provided in the chamber 105. Water droplets that have entered the chamber from a chamber entrance 103 with air hit and adhere to an entrance-opposed surface 165E of the first shielding plate 165. The water thus adhering to the surface is pushed by the air flowing along the entrance-opposed surface 165E and by gravity, to thereby advance downward. The water then drips downward and is accumulated on a bottom wall surface 105WD which serves as an upper surface of a bottom wall section 161WD. The water is pushed by the flow of air, to thereby advance toward a chamber exit 104. The water is then drained downward from the chamber exit 104.