| 摘要 |
<p>The device serves to stabilize transients in an a.c. voltage network and for filtering out undesired harmonic oscillations and isolated pulses which depart from the required voltage pattern. The main feature of this device is that the network voltage is fed, with a low impedance and without a transformer, over cross-field transistors and low-impedance d.c. voltage energy sources. The device consists essentially of a circuit with a power electronics part (1) and a drive electronics part (2), which are connected to the mains (P), (N). In the event of voltage deviations, the charged capacitors (7) or (8), operating in a push-pull manner, feed correction currents to the network via so-called external n-channel cross-field transistors (13) and (14) in a cathode follower circuit. As far as excessive network voltages are concerned, they are discharged by so-called inner cross-field transistors (17) and (18), which are in parallel to the external transistors (13) or (14) as regards the grid and cathodes, and lead directly, with their anodes and series diodes (19) or (20), to the opposite network connections. The external transistors (13) and (14) are separated by switching transistors (11) or (12) during the half-periods of operational discharging by the inner transistors (17) or (18). The ideal network voltage is produced in damped parallel oscillating circuits (21) and (22) which are in resonance at the network frequency.</p> |
