| 摘要 |
An power supply for X-Ray-tube of a photofluorographic Roentgen apparatus comprises a transformer (1) with primary (2) and secondary windings, high-voltage bridge rectifier (4), a voltage regulation device (5) marked on a draft by the dotted line and two current inputs 6,7 for a low-frequency alternating current of the main. Input 6 is connected directly to one of terminals of winding 2, second input 7 is connected via a voltage regulation device to second winding 2 lead 2. Winding 3 is connected via high-voltage bridge rectifier 4 with electrodes of X-ray tubes 8, the voltage regulation device 5 is made as voltage regulator comprising a diode bridge field regulating transistor choke 11 and damping elements which connect capacitor 12, resistor 13, capacitor 14, which form RC- circuit, also diodes 15. A device 5 for voltage regulation comprises a regulating transistor control device, which comprises an unbalance signal amplifier feedback signal rectifier 17, modulator 18, galvanic insulation element 19 and control signal amplifier 20. Both inputs of elements 17 are connected to winding 2 terminals, its output is connected to one of amplifier16 input, second input of which serves for supplying of control signal, its output is connected to input of pulse-length modulator 18, output of which through element 19 of galvanic insulation is connected to amplifier input 20, outputs of which are connected to control electrodes of 10 transistor. |
