SU752684A1 - Dc voltage high-voltage source - Google Patents

Description

one

The invention relates to electrical engineering and can be used to power cathode ray tubes of electron microscopes, in X-ray technology and in other areas of national economy where high voltage power sources are required.

High voltage direct voltage sources are known, which contain a transformer with several secondary windings directly connected to the inputs of the corresponding rectifying devices. High voltage in such sources is obtained by sequential connection of single-phase or three-phase rectifying devices at outputs 1, 2, 3.

In these devices, the accidental breakdown of a diode or a capacitor that is part of the rectifier device creates a short circuit in the transformer's secondary winding and causes the entire device to fail. This disadvantage is especially noticeable in cases where a high-voltage source contains a large number of series-connected rectifier devices, since the probability of failure in this case increases dramatically. At the same time, an increase in the number of rectifying devices allowed

to obtain an important advantage, namely, the improvement of the quality of the output voltage. However, the reliability of the device is impaired.

5 The closest to the invention is a high-voltage constant-voltage source, comprising a transformer, each of which has a N secondary windings of which is connected to the rectifier device, and at the output all rectifying devices are connected in series

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The disadvantages of this device are its low reliability and low quality of output output.

The aim of the invention is to increase reliability and improve the quality of the output voltage.

20 The goal is achieved by the fact that in a high-voltage source of direct voltage containing a transformer, to each of the N secondary windings of which the input of the rectifier device is connected, and

Claims (3)

25, all rectifying devices are connected in series in series, a fuse is connected in series to each B-chain winding, and the number of secondary windings and the corresponding rectifier devices are selected from the condition L / -, where t / o is the source output voltage and At / The additional-maximum allowable amount of change. OUT The drawing shows a diagram of the device. The high-voltage source contains a transformer, having a primary winding Wo and N secondary windings (Wi, ... W,), each of which is connected to a rectifier device (Uy ... UE). A fuse (Fi, ... is connected in series to the Caledon secondary winding circuit. The rectifier device represents a bottom bridge, the output diagonal of which includes a filtering capacitor. On the output, all rectifying devices are connected in series. The high voltage source of constant voltage works as follows In the case of a single or several diode diodes, as well as a capacitor breakdown, a short circuit occurs in the corresponding circuit of the secondary winding. A short circuit current causes There is a fault on the corresponding fuse, as a result of which the secondary winding is disconnected from the rectifier device. At the same time, the output of the high-voltage source is reduced by the amount of rectified voltage on the disconnected winding. In general, at least one fault the pulsing device did not cause a decrease in the output voltage of the power supply of the permissible level, the condition must be satisfied where 6out is the output voltage of the device, and is the maximum permissible value Changing the output voltage. Obviously, the more secondary windings of a transformer and rectifying devices contain a high-voltage source, the smaller the change in the output voltage causes a disconnecting of one winding and, consequently, the greater the number of rectifying devices are redundant. Failure of a high-voltage source can occur in the event of two or more diodes breaking, when a break in the load current circuit occurs. However, for diodes, a breakdown of the type of breakdown is more characteristic, and the probability of breakage of two or more diodes is low compared to the probability of a diode. The above can also be extended to the case when the high-voltage source contains a three-phase transformer and three-phase rectifying devices. However, in the presence of a three-phase rectifier having three input terminals, it is advisable to connect the secondary windings to each cue through two fuses, since to switch off the rectifier at the input completely, it is necessary to disconnect any two of its input terminals. Due to the choice of the number of secondary windings and the corresponding rectifying devices, as well as the inclusion of fuses in the secondary winding circuit, the high-voltage source contains standby protection devices and has a higher reliability than the known ones. In addition, since in accordance with the above condition the number of secondary windings should be quite large, the transformation ratio for each winding is small, due to which the source is characterized by high stability and low output voltage ripple. Claims A high-voltage source of constant voltage, containing a transformer, to each of the L secondary windings of which a input of a device is connected, and all rectifier devices are connected in series in output, in order to improve the reliability and improve the quality of the output equipment , a fuse is connected in series to each secondary winding, and the number of secondary windings on the corresponding rectifying devices is chosen from the condition where f / Bbix is the output voltage voltage source, and &. - the maximum allowable value of izmeiepi and yih Sources of information taken into account during the examination 1. Author's certificate of the USSR No. 138276, cl. H 02M 7/12, 1961. 2. US patent AI 3419786, cl. 321-27, 1966. 3. US patent number 3363165, cl. 321-27, 1965. W, Iv, 0 W, Mj