SU1539665A1 - Device for measuring electric power and service life of storage batteries - Google Patents

Abstract

The invention relates to devices for measuring electricity and can be used to record the consumption of electricity from batteries and to measure their life. The purpose of the invention is to increase accuracy and stability. The introduction of switches 5 and 6, capacitor 10 and voltage conversion 11 — current allows to suppress the additive error in the current channel caused by the presence of voltages and bias currents at the inputs of the units of the device. The device for measuring electric power and battery life also contains shunt 1, switches 2-4, resistor 7, inverting amplifier 8, capacitor 9, pulse modulator 12, comparison elements 13 and 14, pulse shapers 15 and 16, OR element 17, reversing 18 pulse counter and 19 pulse counter. 2 Il.

Description

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The invention relates to devices for measuring electricity and can be used to record the consumption of electricity from batteries and to measure their life.

The purpose of the invention is to improve the accuracy and stability by eliminating the self-propel by structurally. pressure of additive error in the current channel.

Fig. 1 shows a structural and functional diagram of a device for measuring electric power and battery life; 2 shows timing diagrams for his work.

The device contains shunt 1, switches 2-6, resistor 7, inverting amplifier 8, capacitors 9, 10, voltage-current converter 11, pulse modulator 12, comparison elements 13, 14, pulse drivers 15, 16, pulses OR 17, reversible counter 18 pulses, summing counter 19 pulses, the input of the pulse modulator 12 is connected in parallel to the controlled circuit, the first output of the shunt 1 is connected to the common wire of the circuit, the second output through the key 2 to the first output of the resistor 7 and through the key 3 to the common wire , the second output of resistor 7 is connected The first inputs of the comparison elements 13, 14 are connected to the input of the inverting amplifier 8, the reference inputs of the reference voltage are connected to the second inputs of the inverting amplifier 8, the output of the comparison element 13 is connected to the input of the T5 pulse former, the output of the comparison element 14 is connected to the input of the former The 16 pulses, the outputs of the formers 15, 16 are connected to the inputs of the element OR 17 and, respectively, to the direct and inverse inputs of the reversible counter 18 pulses, the direct input of which is connected to the input of the summing counter 19. named pulses, the output of the element OR Y is connected to the control input of the key 6, the key 6 is connected in parallel to the capacitor 9, the first plate of which is connected to the input of the inverting amplifier 8, the key 4 is connected to the second plate of the capacitor 9 and to the output of the inverting amplifier 8, the key 5 is connected to the second plate of the capacitor 10 and to the output of the inverting amplifier 8, the first and second plates con

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The capacitor 10 is connected respectively to the output and input of the converter 11 voltage - current, and the output of the converter 11 is connected to the input of the inverting amplifier 8, the control inputs of the keys 2, 4 are connected to the forward output of the pulse modulator 12, and the control inputs of the keys 3, 5 are connected to its inverse output.

A device for measuring electricity and battery life is as follows.

Suppose that when switching on the circuit (Fig. 1) at the time point (Fig. 2), the pulse modulator 12 opens the keys 3, 5 and closes the keys 2, 4 Moreover, if a voltage or a bias current is present at the input of the inverting amplifier 8, then this signal begins to integrate in the auxiliary integrator, formed on inverting amplifier 8, capacitor 10 and resistor 7. Suppose that the bias signal has a negative sign. Then, at the capacitor 10 and at the input of the converter 11, the voltage — a current begins to appear, a rising voltage of positive polarity. If the converter 11 has a direct transfer function, then with an increase in voltage at its input, its output current also increases accordingly. Since this current is fed to the input of the inverting amplifier 8 in polarity opposite to the bias signal, the bias signal is gradually suppressed during the integration process. At a certain value of voltage iust (Fig. 2b), the bias signal at the input of the inverting amplifier "and the output signal of the converter 11 voltage - current are mutually suppressed as equal in magnitude and opposite in sign. This process, depending on the competitive implementation, can be carried out both in one clock cycle and in several clock cycles (Fig. 2c) of the pulse modulator. In this case, the voltage Ubblx (Fig. 2b) at the output of the inverting amplifier 8 cyclically switches to the voltage levels that were previously established in the integrating capacitors 9, 10.

In the time interval tQ - t, (figv), when there is no current signal at the device input, it can be seen as

each switching of the modulator 12, when the keys 2, 4 are turned on and the keys 3, 5 are turned off, the zero offset signal is initially integrated in the working integrator formed by the same inverting amplifier 8, resistor 7 and integrate Fig. 2c) comparing element 13 pulse shaper 15 is turned on. With a short output pulse, the driver 15 turns on the key 6 through the element OR 17, which leads to the discharge of the capacitor 9, and turns on the counters 19, 18 of the pulses, which increases them with a striking capacitor 9. As the voltage approaches the input converter Q per unit. Further, the voltage pickup process 11 — the current to the magnitude integration may cyclically cause this voltage UycT to be lost. The counting value is stopped. energy, thus, determined at time t, at the input

Fig. 2c) a comparison element 13 is triggered and the pulse shaper 15 is turned on. The short output pulse shaper 15 turns on the pulse time through the OR element 17 key 6, which leads to the discharge of the capacitor 9, and turns on the counters 19, 18 pulses, which increases their readings by one. Further, the integration process may be cyclically reversed. The reference value of the energy consumed is thus determined by the appropriate choice of ve

device appears 1VX (fig. 2a), j5 of the voltage of the reference voltage + U0 discharging the battery, which, suppose, corresponds to the voltage drop on the shunt 1 of the negative sign, then with each further switch on of the keys 2.4 and off key 3, 5 this signal is integrated on the capacitor 9. Each time the keys 3, 5 are turned on and the keys 2, 4 are turned off, the above process of auto-tuning zero occurs in the current channel 25, independent of the magnitude and sign of the signal on the current input. The integration resolution can be increased to required value by a corresponding increase in the operating 30 frequency of the pulse modulator. The voltage on the plates of the capacitor 9 in this case is

In Fig. 2a, b, c, it is shown how the integration process of the capacitor 9 varies while the input current is being led down at time tj, while changing the direction of the input current at time t. (mode and battery), with an increase in n input voltage at the time of ts.

At time t6 (Fig. 2c), the pulse voltage at the output and tamping amplifier 8 is compared with the reference voltage -U0, in the middle of which the comparison element 1 is triggered, 16 pulses are turned on, the key 6 is triggered The torus 9 is discharged and the inverse of the input of the counter 18 pulses is a post subtractive pulse.

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| Tr-I 4, (t) -U6x (.t) dt -f U0,

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where is u6y

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- respectively, the voltage and current at the input of the device; transmission coefficient of pulse modulator 12;

shunt resistance 1;

capacitor capacitance 9;

resistance of resistor 7;

voltage that occurs when the device circuit is turned on. The voltage rise at the capacitor 9 and the corresponding increase in the pulse voltage at the output of the inverting amplifier 8. can be continued until the pulse amplitude reaches the reference level + U0. at time tft

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Figures 2a, b, and c show how the integration process in the capacitor 9 changes when the input current decreases at time tj, when the direction of the input current changes at time t. (battery charge mode), with an increase in the input voltage level at the time ts.

At time t6 (Fig. 2c), the pulse voltage at the output of the inverting amplifier 8 is compared with the reference voltage -U0, as a result of which the comparison element 14 is triggered, the pulse shaper 16 is turned on, the key 6 is triggered by the OR 17 element A subtracting pulse is fed to the inverse input of the pulse counter 18.

Figure 2 in c, d, d shows the distribution of pulses at the inputs of the reversible counter 18 pulses.

As can be seen from the diagrams, the device can be calibrated by changing the transmission coefficient of the pulse modulator 12, changing the magnitude of the resistor 7 and changing the values of the reference voltages + U0 and -U0. In the latter way, the device can be calibrated so that the reading period at the rated load in the reverse direction of the current at the device input (battery charge mode) is slow and is defined as

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- KPD of charge of the battery;

- the period of operation of the counters 18, 19 pulses in the mode of measuring the energy consumption of the battery.

Accounting for the efficiency of charging a battery allows one to more accurately determine the degree of its charge, and the presence of a summing counter of 19 pulses makes it possible, by estimating its total operating time, to determine the resource.

Claims (1)

Formula of gain A device for measuring electricity and battery life, comprising a shunt, a first, second and third switch, a resistor, an inverting amplifier, a pulse modulator, a first capacitor, the first and second reference elements, the first and second drivers, impulses, OR element, reversing a pulse counter and a summing pulse counter, the pulse modulator input is connected in parallel to the controlled circuit, the first output of the shunt is connected to the common wire of the circuit, the second output is via the first key to the first output of the resistor, which The second key is connected to the common wire, the second output of the resistor is connected to the input of the inverting amplifier, the first inputs of the comparison elements are connected to the output of the inverting amplifier, the different polarity reference voltages are connected to the second inputs of the comparison elements, the outputs of the first and second comparison elements are connected respectively to the inputs the first and second pulse formers, the outputs of the pulse formers are connected to the inputs of the OR element and to the inputs of the reverse pulse counter, the direct input of which Connected to the input of a pulse counter, the output of the element OR is connected to the control input of the third key, which is connected parallel to the first capacitor, the first lining of which is connected to the input of the inverting amplifier, the forward output of the pulse modulator is connected to the correcting input of the first key, and the inverse output - to the control input of the second key, characterized in that, in order to increase accuracy and stability, the fourth and fifth keys, the second capacitor and the converter are inserted into the device the current is the fourth key connected to the second plate of the first capacitor and the output of the inverting amplifier; the fifth key is connected to the second plate of the second capacitor and the output of the inverting amplifier; the first and second plates of the second capacitor are respectively connected to the output and input of the voltage to current converter and the output of the voltage converter is the current connected to the input of the inverting amplifier, and the control inputs of the fourth and fifth switches are connected respectively to the direct and inverse outputs of the impulses meat modulator. FIG. 2