Abstract:
PROBLEM TO BE SOLVED: To provide a power source device in which current flowing in a helix form for the rise period of helix voltage and collector voltage can be reduced, by using low-cost general purpose parts without resulting in reduction of the maximum gain during the normal operation times of a traveling-wave tube, and to provide a high frequency circuit system equipped with the device. SOLUTION: There are provided a Zener diode connected between a helix electrode and an anode electrode, a transistor that short-circuits or opens between the cathode and the anode of the Zener diode, a photocoupler to turn the transistor on/off by a phototransistor, a first switch for supplying or cutting-off direct electric voltage to a photodiode of the photocoupler, a capacitor which is applied of the direct electric voltage supplied to the photodiode, and a control part in which the direct electric voltage is applied to the photocoupler and the capacitor by turning the first switch on, in advance, while the first switch is simultaneously turned off, when the helix voltage is applied. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a circuit to supply a power source to a traveling-wave tube having a structure which is small, inexpensive and strong against vibration and impact. SOLUTION: A first control element 16 is turned on when the potential of a helix electrode rises to a prescribed threshold, determined by the ratio of the value of a first resistance to the value of a second resistance, with respect to the potential of a positive side heater electrode or a negative side heater electrode, to bring a first terminal and a second terminal into a conducting state. A second control element 17 is turned on, when the first control element 16 is turned off to keep the anode electrode and the cathode electrode at a same potential, and is turned off when the first control element 16 is turned on, to apply a voltage to the anode electrode by producing a potential difference between the anode electrode and the cathode electrode. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a current measuring device and a voltage measuring device capable of measuring safely and easily a current flowing in each electrode of an electron tube or an applied voltage to each electrode, and to provide a power supply device with the same. SOLUTION: The current measuring device has a detection resistor for detecting a current flowing in the electrode of the electron tube, or a voltage dividing resistor for dividing the applied voltage between electrodes; a detection circuit to output detection results by the detection resistor or the voltage dividing resistor; a pulse generation circuit for generating a pulse signal whose pulse attribute is changed depending on an output voltage from the detection circuit; a switch for short-circuiting the interval between secondary windings of a transformer according to the pulse signal; a pulse detection circuit for detecting a pulsing current flowing in a primary winding of the transformer; and an operation device for measuring the pulse attribute of the pulsing current, and determining a current flowing in the detection resistor or a voltage between the electrodes. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent the degradation of characteristics and damages of an electron tube and alleviate loading of an power supply device by suppressing an excessive helix current flowing upon starting up of a power supply voltage, without causing deterioration of a maximum gain during normal operation of the electron tube such as a travelling wave tube. SOLUTION: The electron tube or a power supply device includes a detection circuit to detect current flowing in a helix electrode, a voltage restriction circuit which controls the potential difference between the helix electrode and an anode electrode to a prescribed voltage, and a switch which switches over whether to connect through the voltage restriction circuit or by short-circuiting between the helix electrode and the anode electrode according to the output of the detection circuit. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent a withstand voltage of a collector of a microwave tube from deteriorating. SOLUTION: The collector 1 of the microwave tube comprises a collector electrode 11, an insulator 12, and a heat sink 13. In the collector 1, the insulator 12 covering the collector electrode 11 has a cone structure tapering in the tube axis direction. Accompanying this, the collector electrode 11 is placed in contact with the inner circumference surface of the insulator 12. The outer diameter of the collector electrode 11 tapers in the tube axis direction reverse to the tapering of the cone structure of the insulator 12. Further, the heat sink 13 is placed in contact with the outer circumference surface of the insulator 12. The inner diameter of the heat sink 13 tapers in the tube axis direction reverse to the tapering of the cone structure of the insulator 12. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a traveling wave tube equipped with a heat radiation structure capable of securing a space for the traveling wave tube on the upper part of a heat radiation body without lowering the property of conducting heat from a collector core to a heat sink. SOLUTION: A collector part 2 has a collector electrode part 5 collecting electron beam, an insulator 6 located at and contacting with the outer peripheral surface of the collector electrode part 5, a heat radiation body 3 contacting with and located at the outside of the insulator 6, and a caulking members 10, 11. The heat radiation body 3 has a contact face contacting a heat sink 4, and an opening part 7, located on the upper surface at the opposite side of the contact face, where a part of the insulator 6 is exposed, is formed so as to cross the collector part 2 in the direction of a virtual tube axis 70. The caulking members 10, 11 are arranged at the opening part 7 to make the heat radiation body 3 closely contact with the insulator 6. COPYRIGHT: (C)2005,JPO&NCIPI