SWITCHING UNIT AND DEVICE BUILT AROUND IT FOR FEEDING LOAD WITH ALTERNATING VOLTAGE Russian patent published in 2003 - IPC

FIELD: high- voltage electronic switching devices and alternating-voltage load feeding devices built around them. SUBSTANCE: proposed switching unit built in the form of bipolar-switching electron-beam valve enabling tracing of temperature conditions of cathodes and of device feeding load with alternating power, as well as automatic control of electron-beam valve temperature has electron-beam system of first group of electrodes incorporating at least one heater cathode and hollow shaping, control, and correcting electrodes whose quantity depends on number of heater cathodes, hollow cathodes being disposed axisymmetrically relative to respective cathode group, and respective set of current leads; electron-beam system is provided with second group of electrodes and respective set of current leads. Second group of electrodes is identical to first one; shaping, control, and correcting electrodes of respective cathodes of first and second groups are disposed between cathodes of both groups; in addition at least one cathode in each group of electrodes is provided with heat sensing device. Switching unit incorporated in device for feeding load with alternating voltage is made in the form of above-described electron-beam valve; in addition device is provided with first and second thermal emf boosters, first and second automatic-control power units of heaters, first and second automatic- control units for feeding correcting electrodes, charging and discharging capacitors, and electrostatic charge integrator. Device built around proposed switching unit can be used, for example, to feed gas-and-dust cleaning equipment at thermal power stations for cleaning stack gases. EFFECT: enhanced economic efficiency and operating reliability. 5 cl, 7 dwg