Abstract: A high-voltage power supply device includes a voltage generation unit for outputting a DC high-voltage, a switching unit using a semiconductor switching element, the switching unit being configured to output an output voltage by the voltage generation unit to a voltage output terminal in a conduction state, a driver for driving a control terminal of the semiconductor switching element, and a controller for controlling the switching unit via the driver. The driver includes a high-frequency transformer provided with primary and secondary windings, a distribution of a stray capacitance per number of unit turns of the primary winding between the primary and secondary windings in an extension direction of the primary winding being symmetrical to a midpoint of the primary winding, a rectifier for rectifying an AC current induced in the secondary winding, and a balanced output type high-frequency excitation unit for exciting the primary winding differentially.

Abstract: Fluctuations of an output voltage at the time of a sudden change in a load current is suppressed while keeping an increase in size of a device.

Abstract: A time-of-flight mass spectrometry device, includes: a flight tube: a flight tube power supply that applies a voltage to the flight tube; and a noise reduction circuit that is connected to a flight tube voltage portion which lies between the flight tube and the flight tube power supply, wherein: the noise reduction circuit inverts and amplifies an input voltage from an input end of the noise reduction circuit, and feeds inverted and amplified voltage back to the flight tube voltage portion through an output end.

Abstract: A time-of-flight mass spectrometry device, includes: a flight tube: a flight tube power supply that applies a voltage to the flight tube; and a noise reduction circuit that is connected to a flight tube voltage portion which lies between the flight tube and the flight tube power supply, wherein: the noise reduction circuit inverts and amplifies an input voltage from an input end of the noise reduction circuit, and feeds inverted and amplified voltage back to the flight tube voltage portion through an output end.

Abstract: An optical emission analyzer is provided with a circuit-closing switch (56) for changing the state of an arc-generating circuit 5 between the closed state and the open state and a reverse-blocking diode (55) for preventing a spark current from flowing into the circuit-closing switch (56). The circuit-closing switch (56) is turned on before the beginning of a spark discharge between a discharge electrode (31) and a sample (32) to initiate excitation of a coil (53). Consequently, the excitation current of the coil (53) can be increased to a target value within the duration of the spark discharge without using a low-inductance coil or increasing the switching frequency of a switching element (52).

Abstract: After a switching element 13 is turned on, a charge controller 16 determines whether or not a current detected by an excitation current detector 15 has reached a predetermined level, and turns off the switching element 13 if the predetermined level has been reached. When the excitation current is controlled to a constant level, the excitation energy stored in a flyback transformer 12 also becomes constant, and this constant energy is stored in a capacitor 22 every time the switching element 13 is turned off. The charge control section 16 repeats the on/off operation of the switching element 13 a predetermined number of times at predetermined intervals of time before discontinuing the charging operation. Consequently, a constant amount of energy is held in the capacitor 22 when the charging operation is discontinued, and the period of time from the beginning to the completion of charging also becomes constant.

Abstract: An optical emission analyzer is provided with a circuit-closing switch (56) for changing the state of an arc-generating circuit 5 between the closed state and the open state and a reverse-blocking diode (55) for preventing a spark current from flowing into the circuit-closing switch (56). The circuit-closing switch (56) is turned on before the beginning of a spark discharge between a discharge electrode (31) and a sample (32) to initiate excitation of a coil (53). Consequently, the excitation current of the coil (53) can be increased to a target value within the duration of the spark discharge without using a low-inductance coil or increasing the switching frequency of a switching element (52).

Abstract: After a switching element 13 is turned on, a charge controller 16 determines whether or not a current detected by an excitation current detector 15 has reached a predetermined level, and turns off the switching element 13 if the predetermined level has been reached. When the excitation current is controlled to a constant level, the excitation energy stored in a flyback transformer 12 also becomes constant, and this constant energy is stored in a capacitor 22 every time the switching element 13 is turned off. The charge control section 16 repeats the on/off operation of the switching element 13 a predetermined number of times at predetermined intervals of time before discontinuing the charging operation. Consequently, a constant amount of energy is held in the capacitor 22 when the charging operation is discontinued, and the period of time from the beginning to the completion of charging also becomes constant.