SU759964A1 - Ampere-hour meter - Google Patents

Description

The invention relates to a measuring technology and can be used to determine the degree of charge of batteries operating in charge-discharge mode.

Ampere-hour counters are known, consisting of a matching device that converts the input current into an analog value proportional to it 1, an analog-to-frequency converter · and a pulse counter [G).

However, the known meters of ampere-time meters, measuring DC voltage with alternating voltage, use reversible circuits of the above devices, which complicates the circuit design.

The closest in technical essence to the present invention is a 2 ampere-hour counter, consisting of a DC transformer, a rectifier bridge, a voltage-frequency converter and an im- counter. pulses ζ2]. 2

The disadvantage of the known device

lies in insensitivity to.

the polarity (for example; the spelling) of the measured current. Uh

2>

The purpose of the invention is to expand the functionality by determining the polarity of the current.

This goal is achieved by the fact that an ampere-hour meter containing a series-connected DC transformer, a rectifier bridge powered from a rectangular voltage source, a voltage-to-frequency converter and a pulse counter are inserted into the secondary winding of one of the cores of the DC transformer differentiating KS chain,

5 trigger and two threshold devices, the inputs of which are connected to the output of the differentiating KS chain, and the outputs are connected to the inputs of the trigger, the output of which is connected to the input

θ control pulse counter reversal.

Figure 1 shows the schematic diagram of the counter ampere-hours; in figure 2

5 diagrams explaining the operation of the ampere-hour meter.

The ampere hour meter contains trans. direct current transformer 1, made of two cores from the material with a rectangular loop hyster759964

four

At the secondary winding 2 of one of the cores, a rectifier bridge 3, a resistor 4, a voltage-frequency converter 5, a pulse counter b are connected, and the secondary winding 7 of the other cores are connected to a differentiating JS-chain 8, threshold devices 9,10 and trigger 11. ...... ·, ···

, When the measured current flows through the primary circuit of the dc transformer 1, the voltage on the resistor 4 is proportional to the magnitude of this current. From the resistor 4, the voltage is applied to the voltage-to-frequency converter 5, the output of which is connected to the input of the counter 6 pulses. Thus, the frequency of the alternating voltage at the output of the converter is proportional to the measured current, and the number of pulses stored in the meter is the amount of electricity 1

N = & [/ ЦЙ / сИ, where К => с о п 5 ί. about

The expression holds for both positive and negative. -.nogo directions of the measured current. Information about the sign of the latter is removed from the secondary winding of the DC transformer. When the secondary circuit of the DC transformer is powered by a rectangular voltage (fig. 2a), the voltage on the winding 7 is for positive, negative, and zero current values

Ι _ν has the form shown in FIG. 2d, e, b, respectively.

In the absence of current 1 ^ the applied rectangular voltage And _PMT is divided in half between the thermostat ^! windings 7 and 2. After differentiation I C-chain 8 aplitu of voltage pulses (figv) on the resistor 12 when changing polarity and _pit is equal, therefore, the supply voltage. ,

Pry M O one of the cores is re-magnetized, the second is in the Saturation State and, therefore, the voltage drop on the secondary winding of the latter is close to zero. • It means that the voltage on the secondary winding of the remagnetising core is equal to the supply voltage, therefore the amplitude of the pulses (fig.2d and g) on the resistor 12 when changing the polarity 1) _pmt is equal to twice the value of the latter.

Depending on direction I,

These impulses are either positive or negative. This, along with the said _h output pulses of the differentiating RC-chain 8 also pulses appear at the instants' core exit IE saturated state and entry into it, corresponding to the emergence and disappearance of the voltage drop across the secondary winding of the core. However, the magnitude of these pulses turns out to be much smaller than the pulses corresponding to the moment of polarity change. The change in current Ι _Ί · changes the moment of transition of the core to the saturated state and back and, consequently, the position of the pulses corresponding to this transition without changing either the value or the position of the pulse corresponding to the moment of change of polarity 1) _PET .

The reference voltage * .and _{in the} threshold devices 9 and 10 are selected so that these devices pass only pulses corresponding to the moment of change of polarity and _pst . Thus, the presence of pulses at the output of the threshold device 9 corresponds to the positive direction of the current C, and at the output of the threshold device 10 to the negative. The outputs of the threshold devices .9 and 10 are connected to the setup ^ inputs of the trigger 11, depending on the state of which the pulses of the converter 5 are fed either to the summing or to the subtracting inputs of the counter b.

The proposed implementation of the ampere-hour meter circuit allows the use of simple irreversible circuits of a DC transformer and an analog-frequency converter, which greatly simplifies the circuit and the design of the device as a whole.

Claims (1)

Claim An ampere-hour meter containing a series-connected DC transformer, a rectifier bridge, a voltage-to-frequency converter, and a pulse counter, characterized in that, in order to extend the functionality by determining the polarity of the current, one of the following is included in the secondary winding DC transformer cores differentiating KS-chain, trigger and two threshold devices, the inputs of which are connected to the output of the differentiating KS-chain, and the outputs are connected to the inputs trigger, the output of which is connected to the control input of the pulse counter reversal. .