SU711640A1 - Discretely adjustable capacitor - Google Patents

Description

one

The invention relates to the field of radio engineering and can be used in high-power radio transmitting devices for changing the tuning frequency of oscillatory circuits.

A discretely tunable capacitor is known, which contains parallel-connected links consisting of series-connected elements with a constant capacity of various sizes and switching organs, with which they obtain the required capacity value of a discretely tunable capacitor l.

Since a discretely tunable capacitor must satisfy the requirement of excluding overloading its power elements at any value of the capacitor's capacity, and at certain capacitance values its installed capacity cannot be fully used, this leads to a significant increase in

POWER of discrete tunable capacitor.

The closest in technical essence is a discretely tunable capacitor, mainly for high-power radio engineering devices, containing fixed capacitance elements connected via two buses and switching elements placed between them 21.

0

The disadvantage of this capacitor is the significant amount of installed reactive cable.

The purpose of the invention is to reduce the magnitude of the installed reactive power.

The goal is achieved by the fact that in a known discretely tunable capacitor, a preamplifier is. but for powerful radio devices containing constant capacitance sncMOHTiii, connected with two women and commutating organs located between them, commutation organs

are located in the segments of tires, and, the organs of the commutator of one of the tires are located in all its segments, and the organs of commutating the other in each of its second segment.

The drawing shows the functional diagram of the proposed discretely tunable capacitor. The capacitor contains elements of a constant capacitance 1, connected via busbars 2 and 3, which include comutapy organs4, 5,6,7. Switching agencies 4 slots for connecting a capacitor to an external circuit, with switching organs 4, 5, 6 of one of the busbars 2 are located in all segments, and switching organs 4, 7 of another bus 3 in every second segment of it.

The capacitor works as follows.

If the switching units 5, 6, 7 are in the closed position, then all the elements are connected in parallel, and the capacitance value of the capacitor is maximum and is determined by the expression

wax where k is the total number of elements

in the condenser;

GO - the value of the capacity of each element

In this case, the nominal reactive power of the capacitor is maximum and equal to its installed reactive power.

With open switching bodies 5, 7, all K elements are connected in series and the capacitor capacitance

it will be minimal

     c - p / k hiih about

In this case, the nominal reactive power of the capacitor is also maximum and equal to its installed reactive power.

In the proposed capacitor, the connection of elements in parallel in p1d, and a series in series, gives a set of capacitance values between the values of

 Joh

It should be noted that in discrete

with a tunable capacitor, obtaining the required capacitance with a given accuracy is possible by turning off some elements in several or in all series-connected rows.

In contrast to the known binary capacitor, which has a maximum nominal reactive power only with one maximum capacitance value, the proposed capacitor has a minimum nominal reactive power value with several capacitance values, in addition, a change in the capacitor capacitance value from C to) to produce only by periodically reducing the number of elements in it from the maximum K to some instant.

As a result, periodically, depending on the capacitance of the capacitor, its nominal

5 is the power and the magnitude of the relative change in capacitance (tuning step), which is inversely proportional to the number of elements.

The proposed capacitor circuit is more E (} x}) effective in terms of the installed-power utilization factor, it makes it possible to recalculate the elements so that almost all of its elements can be used to obtain the required capacitance capacitance. It does not require such an excessive supply of installed reactive power, as in other types

0 capacitors, and this allows to reduce the value of the installed reactive power of the capacitor.

Od11ako for the full realization of the above advantages of the proposed

5 of a discretely tunable capacitor circuit, it is necessary that the nominal reactive power of each element be equal to the ratio Q / K, where QJ is the value of reactive power,

0 required to avoid overloading the elements of the capacitor with the value of its capacity, which corresponds to - the minimum number of capacitor elements required for the liver to have the maximum allowable step of the capacitor setting.

If this condition is fulfilled, the installed reactive power of the proposed capacitor can be written as follows:

Q, -q. (T

where I is the number of parallel-connected elements in the capacitor circuit when obtaining the minimum required capacitance

Claims (2)

a capacitor () or the number of successively connected rows in its scheme, with the maximum required capacitance, discretely rebuilding the capacitor. (Suu), the smallest of them is substituted by the smallest of them. Mohdao to show that, in order to enable the tuning of a discretely tunable capacitor without overloading its elements, the installed reactive power must be greater than the maximum power value, Qy, not more than (And 1 | N) times, i.e. coefficient of utilization of the installed reactive power K - f iiilf ICP .-- H N). The optimal value of the capacity of each element is determined by the formula; The efficiency of the proposed discretely tunable capacitor is that its installed reactive power, which means its cost and dimensions are less than in known discretely tunable capacitors, which is especially important when used in powerful radio devices. Invention Discrete tunable capacitor, npeitMymecTseHHO for high-power radio devices, containing fixed capacitance elements connected by twin tires and commutator organs located between them, characterized in that, in order to reduce the magnitude of the installed reactive power, the commutator organs are located in segments of tires, and the switching organs of one of the women are located in all segments, and the switching organs of the other are located in every second segment. Sources of information, gftye Eo attention in the examination 1. US patent number 3900772, cl. 317-250, 19.O8.75. 2. Kaluzhsky A. D. To the calculation of a discrete variable capacitor. Issues of radio electronics, ser. TRS, 1974, l. 2 (prototype).