SU1467595A1 - Device for measuring time-related parameters of relay - Google Patents

Abstract

The invention relates to a pulse technique and can be applied in devices for measuring the time parameters of switching devices, such as electromagnetic relays. The purpose of the invention is to increase the speed of measurement, simplify the device and enable automation. The device contains a source of test voltage 1, a source of reference voltage, a contactless switch 3, a test relay 4, a logic unit 2, a variable resistor 8, a compiler 6. The ability to automate the measurement process is provided by introducing into the device an electronic comparator, a logic unit whose output signals are pulses whose durations correspond to the time of switching on and releasing the contacts of an electromagnetic relay. Measuring the duration of these pulses with a digital frequency meter-periodo- meter greatly improves the accuracy of measuring time parameters. 5 silt, GP llmmjittt (L and sl ate SP 9m

Description

The invention relates to a pulse technique and can be used in devices for measuring time paragles of switching devices, such as electromagnetic relays.

The purpose of the invention is to increase the speed of measurement, simplify the device and enable automation,

FIG. an electrical functional device diagram is shown; Figure 2 - aD - epures explaining his work; FIGS. 3 and 4 are embodiments of a matching device for measuring t and t, respectively; figure 5 - logical block, supplemented by the switch.

The device consists of a generator of pulses of rectangular positive polarity (source of test voltage), the output of which is connected parallel to the first input of logic unit 2 and the input of the contactless switch 3, the emitter of which is connected to the housing, and the collector is connected to one of the outputs the winding of the test relay 4, the second terminal of which is connected to the power source, the first contact of the relay under test is connected to the source of the reference voltage U, and the second contact through the first constant resistor 5 to the non-inverting input comparator b, the inverting input of which through the second constant resistor 7 is connected to the second output of the variable resistor 8, the first output of which is connected to the reference voltage source U, and the third to the case, the output of the comparator is connected to the second input of the logic unit 2, the output of which is connected to the input of the indicator unit 9, which was used as an electronic frequency meter-periodometer in the mode of measuring the pulse duration

Fig. 2 shows the following diagrams: a - voltage at the output of the test voltage source (point A) I 5 - voltage at the second contact of the relay under test (point B); & - voltage on the output of the comparator (point B); d is the voltage at the output of the logic unit for the case of measuring tg (point D); - eg -; the output of the logic block for the measurement case.

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The device works as follows.

The generator 1 generates a sequence of rectangular pulses of positive polarity with the period followed and the duration of the pulses obviously longer than the switch-on and release delay times of the tested relay (Fig. 2a), which are simultaneously fed to the input of the logic unit 2 and to the base of the contactless switch 3, which turns on the pulse relay 4, for one of the closing contacts of which the reference voltage U is applied. The second contact of the relay is connected through the resistor 5 to the inverting input of the precision comparator ora 6, the inverting input of which through a resistor is connected to the reference voltage source and. A resistor 8 is used to set the voltage Uop at which the relay is considered to be turned off or on.

When the relay 4 is turned on, there is a delay in the onset of voltage and “at the output of the comparator 6 OTHOIO

the pulse edge of the generator 1 and this time corresponds to the on-delay time tg of the tested relay. The voltage from the comparator output is fed to the input of block 2, where the pulse is distributed, the duration of which is equal to (Fig. 2d). The device functions similarly when measuring the release time of the toT-n relay (Fig. 2). The generated pulses corresponding to t or t arrive at the input of the indicator, for which the frequencymeter-periodometer is used (in the specific case 43-54) in me pulse duration measurements. The application of a digital measuring device made it possible to significantly improve the accuracy of measurements.

The implementation of the proposed device presents no technical difficulties.

Embodiments of logic unit 2 for measuring t and t are shown in FIG. 3 and 4, respectively. If you add a switch to a logical block, you can use one device to measure both tg. An embodiment of such a logical block is shown in FIG.

The test voltage generator can be implemented according to one of the schemes given in 4. The logic unit and the generator can be executed on the IC of the K155 73 series.

The comparator can be implemented on the IC K521CA. according to one of the schemes given in 5 or 7j.

The contactless switch in a particular case is implemented on a transistor included in the K125HT1 4 microassembly.

The reference voltage source can be implemented according to one of the schemes shown in 6.

Formula inventions

A device for measuring the time parameters of the relay, containing a pulse generator, an indicator unit, a logic unit, a contactless key, the output of the pulse generator connected to the first input of the logic unit to the input of a contactless key, the output of which is connected to the first terminal for connecting the winding of the tested relay, the second output water for connecting the winding of the test relay is connected to an output for connecting the power source of the relay, characterized in that, in order to increase the efficiency of the measurement, simplify roystva and providing automation capabilities, it introduced a comparator and a variable resistor, first comparator input connected to the output

for connecting the first contact of the tested relay, the comparator output is connected to the second input of the logic unit, the output of which is connected to the input of the indicator unit, the output

to connect the second contact of the test relay is connected to one of the terminals of the variable resistor, the movable contact of which is connected to the second input of the comparator.

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Claims (1)

-Claim A device for measuring the time parameters of a relay containing a pulse generator, an indicator block, a logic block, a contactless key, and the output of the pulse generator is connected to the first input of the logic block with the input of a contactless key, the output of which is connected to the first output for connecting the coil of the relay under test, the second water for connecting the winding of the tested relay is connected to the output for connecting the relay power source, characterized in that, in order to improve the efficiency of measurement measurement, simplification roystva and enable automation, it introduced a comparator and a variable resistor, the first input of the comparator is connected to a terminal 15 for connecting the first contact of the test switch, the comparator output is connected to the second input of the logic unit, whose output is connected to the input of the display unit, the output 20 F ^or connecting the second contact of the tested relay is connected to one of the terminals of the variable resistor, the movable contact of which is connected to the second input of the comparator.