SU702301A1 - Ampere-hour meter - Google Patents

Description

The invention relates to electrical measuring technique and can be used to control the capacity of a battery in a DC power supply system. Ampere-hour counters are known for monitoring battery capacity, containing a load, powered by a battery, a self-discharge current sensor for this battery, and a reversible binary counter. To simplify and improve the accuracy, the device is equipped with a switching choke, on the input of which a self-discharge current sensor is connected, a load circuit and a triangular current generator, giving the output windings of the switching choke are connected in series-according and connected to the control system of a reversible binary counter, whose counting input associated with a pulse generator 11. However, this device has limited functionality and insufficient measurement accuracy due to an error due to non-linearity of the control current characteristic. Ampere-hour counters are also known. They contain a switching choke, the measuring winding of which is connected to the device input, and the output winding through the reverse device to the first input of a reversible, binary-decimal counter connected to the digital indicator. The second input of the reversible binary counter is connected to the first output of the pulse generator, which is connected by a second output to the reversible binary counter, the first output of which is connected to the control winding of the choke switches through the codec converter. The throttle bias winding is connected via an adjusting resistor to the source of the reference voltage 2. The drawback of the device is the limited measuring range of the direct currents .. The closest technical solution to the proposed one is an ampere-hour counter, containing a switching choke, the measuring winding of which is connected to the device input, and the output winding through the reverse device with the first input of the binary binary - domestic counter. The output of this counter is connected to a digital indicator, and the second input is connected to the first output of an impulse generator, connected to the second in a halogen iI with a reversible binary counter. The first control winding of the switching throttle is the “goy-go to the output of the first code-current, and the second control turn-off is to the output of the main transducer; the code-to-current. The inputs of the two code-to-current converters are connected to the outputs of the reversible binary counter 3. This counter-ampere-hour with storing high accuracy and measurement stability has a working range twice as large as the previous one: l. :; V. The disadvantage of the known ampere-hour meter is the presence of an error in measuring small currents. This is due to the fact that when the value of zero is magnetised, the current is injected. The codes of the code-current transducers are equal to one half of the amplitude value and the error at this point is doubled. And it is equal to the maximum: the error of the code-current transducer. This leads to a large zero drift and, accordingly, increases the relative error in measuring low currents. The aim of the invention is a noBattie new measurement accuracy. The delivery target is reached & l that the ampere-hour meter contains hep excluding and choke, the measuring winding of which is connected. with the input of the device, and the output through the reverse device - with the first input of the reverse binary debit YV b counter, the output of which is connected to the digital indicator, and the second input to the first output of the generator Htte ijcftif; First-way control output with reversible binary counter. First control winding toggle: Switching connection is connected to the code. the first transducer is a code current, and the control coil is connected to the output of the second code-current transducer ,. The dual trigger and two elements for STpeTa, the first / inputs of which are connected to the first output of a reversible binary counter, the second input of the first prohibition element is connected to the single output of the trigger, and the second yhShPvto element -. zero output of the trigger, the counting input of which is connected to the second output of the reversible binary counter, the output of the first prohibition element is connected to the input of the first transforming code-current, and the output of the second element of the gate is input-BTOipOro converter-Current ,,; FIG. 1 is a block diagram of an ampere-hour meter; in fig. 2 and 3 time diagrams of his work. The ampere-hour counter contains a switching choke 1, having a measuring winding 2, two control windings 3, 4, an output winding 5, and two n |) converter code-current 6.7, two prohibition elements 8, 9, trigger 10, reversing a binary counter 11, a pulse generator 12, a reverse device 13 connected in series, a reversive dual-descript counter 14 and a digital indicator 15. The measuring winding 2 is connected to the input of the device. The first control unit winding 3 is connected to the output of the first code-current converter b, and the second control winding 4 to the output of the second code-current converter 7. Output output 5 is connected to the reverse device 13. The first inputs of the inhibit elements 8, 9 are interconnected and connected to the first output of the reversible, binary counter 11, the second output of which is connected to the counting input of the trigger 10, and the input one with the output of the pulse generator 12. The unit output of the trigger 10 is connected to the second input of the first prohibition element 8 and the zero output d trigger 10 - to the second input of the second prohibition element 9. The output of the first prohibition element 8 is connected to the input of the first code-current converter 6, and the output of the second prohibition element 9 with the input of the second code-current converter 7. The other output of the pulse generator 12 .en to the second input of the reversible binary-decimal counter 14; From the generator, a pulse. In 12 pulses with a reference frequency fg are continuously fed to the inputs of counters 11 ,. 14 .. A reversible binary counter 11 contains a control circuit which, at certain times of the production time of the counter operating mode. There are two such moments. In one of them, all bits of the counter are set. And they are set Vnulevoe, and in the second they are set to one. In the first Case, the control circuit transfers the counter 11 to the addition mode and, as it arrives at its pulses, it receives successive states from 0 to 2 1 (where n is the number of bits of the counter 11). When the counter is full and, therefore, all its bits have been set to one, the control circuit will switch the counter to subtraction mode. Tenepia as the pulses arrive at the counter, Oi takes successive states from 2 1 - 1 to O. Thus, at the first output of the reversible binary counter 11, there is a continuous sequence of parallel n-bit binary numbers varying from to 2 - 1 and from 2 - 1 to O (see Fig.2. The change in numbers occurs at the frequency of the input pulses f. At the SECOND output, there are pulses of frequency f and duration tr - (see Fig. 2.6), which arrive at the estimated trigger input 10. At the outputs of the trigger formed imp Lines with a repetition frequency (see Fig. 2, c and 2, d). A parallel P7 bit binary code from the first output of a reverse binary counter 11 is alternately transmitted to the inputs of code-current converters b, 7 prohibition elements 8, 9, since the second inputs are connected to the direct outputs of trigger 10. At the outputs of converters b, 7 alternately there are pulses of a triangular shape i Fig. 2, d, 2, e), which flowed along the opposite windings of the control 3, 4j are created in the core of the co-type 1 drossel 1 linear cheating ivdees variable Mage itnoe field (see. FIG. 2, g). At times t, tj, t, characterized by a change in the direction of the magnetic flux in the heart of switching throttle 1, the core is re-magnetized and in the output winding 5 pulses V, V2., V, etc. The remagnetization of the core occurs at regular intervals of time T "Tj., While in the output winding 4 there will appear pulses Y, Vj, ultrasonic, etc. also at regular intervals of time (see Fig. 3, a). . Impulses V, V, V, etc. postUnit to the reverse device 13, controlling the binary-decimal reversing pulse counter 14. With the arrival of the V pulse, the reverse device 13 will turn on the reversing binary-decimal pulse counter l4 for summation and during the time interval T; the pulse counter 14 receives pulses from the pulse generator 12. During the time interval T, the number of pulses will go to the counter 14

where Tz is the pulse following period. With the arrival of the Vi pulse, the reverse device 13 will switch the reversible two-turn-decimal counter 14 to Uchi tani. the time interval Тг to the reversible binary-decimal counter .14 from the pulse generator 12 rises in the subtraction the number of pulses

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The ampere-hour meter contains a switching choke, the measuring winding of which is connected to the device input, and the output through the reverse device - to the first input of the reversible binary-decimal counter, the output of which is connected to digital With the arrival of a pulse V, the reverse device 13 will switch the reverse binary-des The incremental counter 14 on addition and process is repeated. For equal time intervals T, T2. the number of pulses received in the reversible binary-decimal counter 14 for summation and: subtraction will be the same and the & N .N - Nj O will be recorded in it. If there is a measured current in the measuring winding 2, which creates magnetic flux, The percolation of the core of the throttles 1 occurs at the time points C, t, t and in the output winding there are pulses V, Vj, Vg at unequal intervals of time T, Tg (see Fig. 3.6). The wharf, the change in time intervals will be directly proportional to the change in ampere turns in the measuring winding and, consequently, the change in the measured current .., Ya, the time intervals T, Tg in the reversible binary-decimal counter 14 will receive iJa3 the number of pulses for addition and subtraction. For the case shown in Fig. 36 ... AN C - «4 T T N2. When changing the direction of the measured current, the process is similar. For the case shown in Fig.Zv N T T. .. Thus, the number of impulses. in a reversible binary de dec pulse meter 14 for one period of change of the control cable, is directly proportional to the measurement of the linear current, and after any time interval t, when the measured current changes in time, the integral t, N. | t | . The output of the pulse counter 14 is associated with a digital display device 15, which provides information in ampere hours. .. Thus, the ampere-hour meter, allows to obtain a variable magnetic flux, the zero value of which corresponds to the zero value of the control currents i- and ° is superior in measurement accuracy of small currents at the beginning of the operating range. 70 indicator, and the second input - to the first pulse generator output, connected by a second output with reversing. DOUBLE SCHEHKHKXM, the first control winding of the switching throttle is connected to the output of the first code-current converter, and the second control winding is connected to the output of the second code-current converter, which distinguishes with 1C and, in order to improve the measurement accuracy, into it A trigger and two prohibitions have been entered / the first inputs of which are connected to the first output of the reversible | kiBOH4Hor from the rutch, the second input of the first prohibition element is connected to the single output of the trigger, and the second entry of the second prohibition - with zero output of the trigger, countable turn is connected to the second output reversivnog binary counter, the first element prohibition output connected to the input of the first current-code converter, and the output of the second member ban - to the input of the second current-code converter. Sources of information taken into account during the examination 1. USSR author's certificate About 385363, cl. H 01 M 10/48, 1971. 2. The author's certificate of the USSR 439757, cl. G 01 R 11/34, 1972. 3. The USSR author's certificate I 524131, cl. G 01 R 11/34, 1975.

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