SU1005200A1 - Voltage divider - Google Patents

Description

(54) VOLTAGE DIVER

one

Isofeating is related to e-technology, in particular to measuring equipment, and can be used, for example, in digital devices for measuring parameters of complex resistances and alternating-current voltages.

Voltage dividers are known that contain transformers or autotransformers between the input and output divider circuits and switches for changing the transmission coefficient fij LS J.

The disadvantages of these delta lines are the low accuracy of l, the complexity of the control circuits of the switching transistors .2, or the complexity of the design of the autotransformers due to the large number of taps, n, 5.

The closest to the proposed technical entity is a voltage divider containing decades, each of which is made in the form of

an autotransformer with taps connected via corresponding sockets and bridges to the input of the adder b.

However, this device is characterized with complexity and lack of accuracy.

The aim of the invention is to simplify and precision the voltage divider noBbm "JHHe".

Claims (6)

This goal is achieved by the fact that in a voltage divider containing decades, each of which is made as an autotransformer with taps connected through corresponding switches to the input of the adder, each. The decade of the divider contains four single circuits, each consisting of two series-connected resistors connected by extreme leads to the input of the adder and the corresponding tap of the autotransformer of this decade, in two proximity switches connected between the common connection point of the corresponding resistors and the common divider bus, while Decadal autotransformers are switched on cascade-paraklelno and two of the four specified chains of the corresponding decade of the divider are connected to the average tap of each of them. The drawing shows a functional voltage divider circuit. Deltggel contains autotransformers 1 and 2c with leads 3,4 and 5, four chains 6,7,8 and 9, each of which is executed in the form of two series-connected resistors 10 and 11 and two contactless ones: switches, like transistors 12 and 13, adder 14 based on the operational amplifier and resistors 15 and 16, input 17 and 18, and input 19 and 2O outputs, respectively. The chains 6,7,8 and 9 are connected between the input of the adder 14 and the corresponding taps 3,4 and 5 of this decade and the divider, and the autotransformers of 1 and 2 decades are connected in cascade-parallel but also two chains are connected to the middle branch 4 7 and 8 of the corresponding divider. The divider works as follows. The input voltage is applied to the cog-out cables 17 and 18, while the input terminal 18 is connected to the common bus of the divider. The contactless switches 12 and 13 of each decade are given such control signals that they or both are turned on or both turned off. In the first case, the voltage from the autotransformers 1 and 2 does not flow to the adder 14, and in the second case the output voltage of the divider is generated as a matter of fact, the voltages nocTynaKS are from autotransformers that are connected to the input of the adder 14 and removed from the output pins 19 and 20 of the divider. In this case, the output voltage at the terminals 19 and 20 depends on the transmission coefficient of the divider, which varies in accordance with the state of the proximity switches 12 and 13 in the chains 6,7,8 and 9 of the first and second decade of the healer. In order to increase the noise immunity, all the elements of the divider are connected to the common tire. The number of turns between the taps 18 and 5, 4, 3, and 17 with respect to 1: 2: 4: 10, which allows us to simplify the construction of the autotransformer and reduce the number of its outputs per unit. Claims The voltage divider containing decades, each of which is made as an autotransformer with taps, is connected through the corresponding switches to the input of the adder, characterized in that, with the aim of simplifying and increasing the accuracy, each decade of the divider contains four identical chains each consisting of two series-connected resistors, connected by extreme leads to the input of the adder and the corresponding tap of the auto-transformer of this decade, and two proximity switches, including ennyh oytsey point between resistors and a compound corresponding oytsey divider bus, the autotransformers decades cascaded-paraplelno and to the center tap of each of these two connected chains of four of said respective divider decade. Sources of information taken into account in the examination 1. SI LIDNIKI I. et al. Features of the design of multi-decade inductive voltage dividers .- In Proc .: Bulletin of the Lviv Polytechnic Institute, 1967, No. 105. 2. Grinevich F. B. and others. On the construction of contactless decades of AC bridges. - F control measurement technique, 1974, No. 16. 3. Transformer bridges. Under Energy, ed. K. B. Karandeeva. M. 197O, p. 186-189. 4. USSR author's certificate number 527749. cl. H OlF 21/12, 1976. 5. USSR author's certificate number 815775, cl. H O1F 21/12, 1981. 6. USSR Author's Certificate for Application No. 2923617/07, cl. H Olf 21/12, 1981.