SU687393A1 - Amper/hour meter - Google Patents

Claims (3)

The invention relates to electrical measuring equipment and can be used to control the capacity of a battery in DC power systems. Ampere-hour counters are known for monitoring the capacity of a battery containing a load supplied from a battery, a self-discharge current sensor for this battery in a reversible binary counter. To simplify and improve accuracy, the device is equipped with a switching dryus, to the input of which a self-discharge current sensor, a load circuit and a triangular-shaped current generator are included. The two output windings of the switching throttle are connected in series to each other and connected to the control of the reversible binary counter control, the counting input of which is connected to the pulse generator. However, such a device has limited functionality and insufficient accuracy of intent due to the non-linearity of the control current characteristic. Also known are devices containing 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 counter connected to the digital indicator. The second input of the reversible binary counter is connected to the first output of the pulse generator, connected by a second output to a reversible binary counter, the first output of which is connected through the converter COD- / GOK to the throttle control winding. The throttle bias winding is connected via a control resistor to a voltage source. A disadvantage of this device is the limited DC measurement range. Most proposed is the ampermeter counter, which also contains a switching choke connected by a measuring winding to the circuit (PI IU (metered current, and the output winding is connected to the first input of the reversible binary-decimal counter , the output of which is connected to a digital indicator, and the second input is connected to the first output of the pulse generator connected to the second output with a reversible binary counter, the first control winding of the switching throttle is connected to the output of the first the converter and the second control winding to the output of the second code-current converter, and the two code-current converters are connected to the outputs of the reversible binary counter 3 J. The disadvantage of such an ampere-hour meter is the limited range of current measurement, which varies widely power systems. The aim of the invention is to extend the measurement range. This is achieved by having an ampere-hour meter containing a switching choke, the measuring winding of which is connected to the input of the device, and the output winding through the reversas device is the first input of a reversible binary digit counter, whose output is connected to a digital indicator, and the second input to the first output of a pulse generator connected by a second output with a reverse binary counter, two code-current converters, which input , connected to the first and second outputs of the reversible binary counter, respectively, and the first outputs, respectively, to the beginnings of the first and second control pins of the switching throttle, two two-view cells were introduced There is a trigger, a trigger control circuit and a scale divider, and both control windings are made in two sections, with the beginning and the end of the second section of the first two section control windings being connected respectively to the first and second outputs of the first two-position key, and the beginning and end of the second section the second two-section control winding — with the first and second outputs of the second two-position key, the first inputs of which are connected to the second outputs of the first and second code-current converters, the unit the trigger output is connected to the second inputs of the on-off keys and to the first input of the scale divider, and the zero output of the trigger 3 is provided by the third inputs of the two-position keys and to the second input of the scale share, the third input of which is connected to the first output of the pulse generator, and the output to the second reversible input a binary-decimal counter, the trigger input is connected to the output of the trigger control circuit, two inputs of which are connected to the third output of the reversible binary counter and to the output of the reverse device. FIG. 1 is a block diagram of an ampere-hour meter; in fig. 2 timing charts of the counter. The ampere-hour counter contains a switching choke 1 having a measuring winding 2, two two-section control windings 3 and 4, an output winding 5 and two converters 6 and 7, two two-position keys 8 and 9, trigger 10, trigger control circuit 111, reversing binary counter 12, scale divider 13, pulse generator 14 and reverse connected device 15, reversible binary-decimal counter 16 and digital indicator 17. Measuring winding 2 is connected to the input of the device. The beginning of the first control winding 3 is connected to the first output of the first code-x converter to 6, and the beginning of the second control winding 4 is connected to the first output of the second code-7 converter 7. Beginning and end of the second section of the first control winding 3 is connected to the outputs of the first two-position key 8, and the beginning and end of the second section of the second control winding 4 are connected to the outputs of the second two-position key 9. The first inputs of the two-posed keys 8 and 9 are connected to the second outputs of the code-6 converters 6 and 7, and the second inputs - with single output m trigger 10 n with the first input of the scale divider 13, the second input of which is connected to the third inputs of the two- POSITIONAL keys 8, 9 and to the null.1 m output of the trigger 1O. The output of the scale divider 13 is connected to the second input of the reversible binary-decimal counter 16. Removable input of the trigger 10 is connected to the output of the trigger control circuit 11, which is connected to the output of the reverse device 15. The inputs of the transducer-i code-ggk 6 and 7 are each connected to its output reversible binary counter 12, the input of which is connected to the first output of the generator 14 pulses. The second output of the generator 14 of the pulses 56 is connected to the third input of the scale divider 13. In the initial state, from a zero output and a trigger 10, a signal is sent to two position keys 8, 9 in such a way that the first sections of windings 3 and 4 are connected to the outputs of converters 6, 7 throttle control, respectively, are included at the outset, with the result that, in the first sections of windings 3, 4, the switching throttle 1 is received respectively by i from the corresponding code-current converters 6, 7, which are started from a reversible binary counter 12 pulses. Continuing to operate this counter, the counting input of which receives pulses from frequency generator 14, provides a periodic process of increase and decrease of currents iy and 4y. In addition, the presence of zero output of trigger 10 permits the passage of reference frequency pulses through a large-scale divider 13 to reversing binary The main counter is 16. In this case, fg) where i is the repetition rate of the process; f, is the pulse frequency of the generator 14; g - the number of bits of the binary reversible counter 12 pulses. Under the action of currents i and 1, a magnetic field with iy, 0) --ivt l H Q - H is created in the core of the switching throttle 1, the magnetic field intensity generated in the core under the influence of currents f, OU, u) is the number of turns in the first control winding sections 3, 4, respectively; S is the length of the average power line of the core of the switching throttle. Accepting t we obtain the magnetic field intensity in the core H –g– of. Since the transducers 6, 7 form almost linearly varying currents iy, and –iyj, the magnetic field in the switching choke 1 will be characterized by a linearly varying besides will be alternating. At times 4, -tj ii, which are characterized by a change in the direction of the magnetic flux 93 in the cores of the throttles, a remagnetization of the core will occur and pulses Uj will appear in the output winding 5. . and etc The remaking of the core will occur at regular intervals of time, while in the output winding 10 there will be a development; pulses are U-, and 5 uj etc. also at regular intervals of time (see FIG. 2a). Pulses Ui, Uj, Uj, etc. arrive at the device 15 of the reverse, which controls the binary-decimal reversing counter of 16 pulses. With the arrival of the pulse Ui, the reverse device 15 will switch on the reversible binary number counter 16 pulses for summing and during the time interval Ti pulses will be sent to the counter 16 pulses from the pulse generator 14 through the scale divider 13. For the time interval T, the reverse recursive binary counter 16 will receive the number of pulses -icfT: where Tj is the pulse period of the generator of 14 pulses; K is the coefficient of the scale divider 13. With the arrival of a pulse (Jj, the reverse device 15 switches the pulse counter 16 to the subtraction. During the time interval T. the pulse counter 16 goes to the subtraction the number of pulses from the pulse generator 14. The pulse Uj removes the subtraction command from the counter 16 and again switches it to summation, etc. For equal time intervals T, Tj, the number of pulses received in counter 16 for summation and reading will be the same and the remainder d S will not be fixed in the counter, since iN Ni-N7.0 . If available, will measure The flap of the measured gok-iuj, which creates the poston bias of the core, the over-clamping of the core of the chokes 1 occurs at time points, and in the output winding ij the pulses UH, i-g, Uj will turn through, equal intervals of time, T see Fig. 26 ). Moreover, the change in the time intervals will be proportional to the change in the ampere turns in the alternating winding 2, and, hardly, to the change in the measured current. During the time intervals, T, the counter 16 will receive a different number of pulses for addition and subtraction. The case shown in FIG. 26 - NO, Tr, N; Mi When changing the direction of the measured current ujM. The process is similar. For the case shown in FIG. 2c, N NH -, Tt Tr,,. Thus, the number of pulses recorded in the counter of 16 pulses during one period of control current change is proportional to the measured current, and for any time interval -t when the measured current varies in time, the integral 4N -l-fcl. -D-fc The output of the pulse counter 16 is associated with a digital indicator 17, which provides information in ampere-hours. For this measurement range, taking into account that in the control windings 3, 4 the amplitudes of currents-iv ivi-v are equal, we can write, max - g where Hwheis - the maximum value of the magnetic field strength generated in the switching core of 1 for the first measurement range. Hence, the maximal value of the measured current for a given sub-band .- .e t-iv, ... where is W4m. - the number of turns in the measuring winding. With an increase in the measured current to a value greater. The core of the dross L 1 is magnetized to saturation (in one direction), its cyclic magnetization reversal stops and the pulses in the output winding disappear and, Ua Ui f, they are absent in the trigger control circuit 11 during the time fik-t L (see Fig 2d), formed in a binary reversible counter 12 pulses, will translate the trigger 1O into a single state (D4 is the rise time of the control current v, determined5 through the 6-MeiiT junction of the device from the first to the second Measuring range, for Fig. 2gAi i equal to half the rise uirav l usheg about ). From the single output of the trigger 10, the signal arrives at the bilayer switches 8, 9 so that the outputs of the code-taek 6 and 7 converters additionally connect the second sections of the windings 3 and, 4 controls the throttles 1, respectively (i.e. the second measurement subband), however, the presence of a single output of trigger 10 permits the passage of pulses of generator 14 to the input of a reversible binary-decimal counter 16, a scale divider 13 for mine. For this measurement subband under the action of currents well, and -iyj in the core of the throttle 1 creates a magnetic flux with , .. .. WhereSh-, (jUj is the number of turns in two sections of each control winding 3 and 4. Taking into account, NC, and taking co eujjj w 2.0U, you can write where H max is the maximum value of nap {e. the magnetic field generated in the core of the switching throttle for the second subrange measurement. Hence, the maximum value of the measured current for the given Hcaco subrange ;, Z-Jy-uJ .. due to the connection of the second winding sections 3 and 4 of the control of the throttles 1 to the on-off keys 8, 9 in the control windings of the throttles 1 flows through ny current triangular derivatives conductive cyclic remagnetization of the core of the choke, forming points in switching the output pulses choke coil 5 U-t, U, Uj at irregular intervals Tj, 14 (see FIG. FIG. 2d). In the following, the process is similar to that described for the first subrange of measurements. For the case presented on f1gg. 2d, N; -, -, Nj -, N; By changing the direction of the measurement, for the case shown in FIG. 2d,.., DM, V T4 N3 N4; N3 - f7N / 4 In this case, the presence of output pulses .Ml. - the output winding 5 of the drosse, P68 l will not cause the BTOpbtx of the additional sections of the windings 3 and 4 of the control of the throttles 1 to be disconnected, as in the control circuit 11 of the control, there is a blocking prohibiting the disconnection of these sections of the control windings. If-pulses uljUj. Uj in the output winding 5 droplets 1 do not fall in time in the time interval D-t (see FIG. 2e), formed in the binary-reversible counter 12 pulses, (- control current rise time Iv) determining the moment of device transition from the second for the first measurement subrange, for FIG. 2- Ai. equal to one-eighth of the control current rise period-). Obviously, when reducing the measured current to the measurement boundaries of the first range, it makes sense to switch to this subrange. If in the time interval At. formed by the B binary-reverse counter 12 pulses, the pulses fall Ui. U 2, Uj of the output winding 5 —the trigger control circuit 11 transfers the trigger 10 to the zero state, as a result of which the first sections of the control windings 3, 4 of the throttles 1 are connected to the outputs of the codec converter 6 to 7, respectively, the measurement process will occur, as shown in FIG. 2a - 2c. The proposed ampere-JiacoB counter measures constant and time-varying currents with high accuracy and in a wider dynamic range, in a known device, due to automatic switching of the measurement subbands. The invention The amp-hour counter containing a pv-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 reversible binary-decimal counter, the output of which is connected to the digital indicator, and the second input to the first output of the pulse generator connected to the second output with a reversible binary counter, two code-current converters, whose inputs are connected respectively to the first and second outputs of the reversing binary account ik, and the first outputs, respectively, with the beginnings of the first and second control modules of the switch throttle, characterized in that, in order to expand the measuring range, two double-view keys, a trigger, a trigger control circuit and a scale divider were entered into it; The control windings are made in two sections, the beginning and the end of the second section of the first two section controlling winding are connected to the first and second outputs of the first two-position key, respectively, and the beginning and the end of the second section to the second two section control coil with the first and second outputs of the second two-position key, the first inputs of which are connected to the second outputs of the first and second code-current converters, respectively. The single output of the trigger is connected to the second inputs of the two-position ion switches and the first input of the scale divider, and the zero output of the trigger is with the third inputs of the dual-punch keys and with the second input of the scale divider, the third input of which is connected to the first output of the pulse generator, and the output to the second input of the reversing binary - a domestic counter, the trigger input is connected to the output of the trigger control circuit, two inputs of which are connected to the third output of the reversible binary counter and to the output output device. Sources of information taken into account in the examination 1. USSR author's certificate number 385363, cl. H 01 M 1O / 48, 1971. 2. USSR author's certificate N9 439757, cl. Q OlT 11/32, 1972. 3. USSR author's certificate number 524131. class. Q 01 R 11/34, 1975 (prototype). (i9, -iy,) (l (4 ietfu "BW I