SU911354A1 - Device for voltage tolerance control - Google Patents

Description

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The invention is intended for use in automated test equipment.

A device for voltage tolerance control is known, which contains a voltage comparison unit, a source of reference voltages, and a result realization unit, in which an analog controlled voltage is compared to anSHEFT reference voltages corresponding to a given norm and tolerances on a controlled voltage.

D1.

However, in this device one of the control results corresponds to their initial state and the reliability of this result is insufficient, since it is also provided by the device in cases when the controlled voltage for some reason does not receive a comparison unit. In addition, when classifying the comparison result, these devices do not distinguish cases of negligible excess of the upper tolerance from cases when the controlled voltage due to a controller error or a malfunction. The equipment dramatically exceeds the expected value and, accordingly, can cause the comparison block to fail.

The closest technical solution to the invention is a device for tolerance voltage control containing a result realization unit, a control unit, a first and second keys, a delay unit, two comparison units and a source of reference voltages, the first output of which is connected to the first input of the first unit of comparison, and the second, third outputs of the source of reference voltages are connected to the first, second

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the inputs of the second comparison unit (2j. However, the known device is difficult and it excludes the decommissioning of comparison units in cases where the 3 controlled voltage significantly exceeds the specified upper maximum allowable value. The purpose of the invention is to increase reliability by overvoltage protection. The goal is achieved by the fact that a device for tolerant voltage control, containing a key, a unit for implementing the result and a source of reference voltages, the first output of which is connected to the first input of the first block cf The second and third outputs of the reference voltage source are connected to the second and third inputs of the second comparison unit, the first and second matching blocks are inserted, the first key input is connected to the input terminal of the device, the output of the key is connected to the first input of the second comparison block the second input of the first comparison unit, the output of which is connected to the first input of the first vigilance match, the output of which is connected to the first input of the implementation unit: the result, the second input of which is connected to the second input of the first matching unit second coincidence output unit, a first input of which is unified with the first output of the second comparator ka blo, a second output connected to the second input of the second block matcher, the third input Single plaques implementation result and the second input key. The drawing shows a block diagram of the device pagged. The device contains a key 1, a source of 2 reference voltages, blocks 3 and 4 of comparison, blocks 5 and 6 of coincidence, and block 7 of the realization of the result, containing LEDs 8-11 and block 1 of coincidence. In block 3 of comparison, the controlled voltage Ic is compared with a reference voltage in, corresponding to a given norm, and in a comparison block with a reference voltage corresponding to the lower Pizza and upper UMOKC boundaries of the expected range (scale) of its values, and voltage IMEDc reliably maintains in the initial state the comparison unit 4 at ITn.) (failure to receive the input of the key 1 of the charging UK.) which corresponds to the initial state of the device. In the initial state, signals 4 on the outputs of blocks 3 and 4 of the comparison and block 5 of the match have a logic level of zero, respectively, the output of the block of match 6 is equal to logical one, and block 7 gives the result of the initial state (LED 9 is on). The controlled voltage through a normally closed switch 1 is applied simultaneously to both blocks 3 and 4 comparisons, in block 3 it is compared with a given norm, and in block 4 it is compared with the lower and upper limits of the expected range of its values (or the starting and ending points of the set scale) , moreover, if comparison unit 4 generates a logical signal about finding a controlled voltage within the scale, the output signals of comparison unit 3 are allowed to pass to result realization unit 7. When the monitored voltage goes beyond the end point of the scale, it is disconnected from the inputs of both blocks 3 and 4 of the comparison, and until it exceeds the initial mark of the scale, the device remains in its original state. In Comparison Unit 3, the monitored voltage is compared with one standard with a single-channel tolerance, with two or more with two-sided tolerance and sorting. After supplying a controlled voltage (connecting to the controlled point of the tested product), depending on the ratio of the compared voltages, three cases are possible, which are listed in the table. B. In the third case, the key 1 disconnects the monitored voltage UK from the inputs of blocks 3 and 4, connects to them a voltage, the greater the causing failure of blocks 3 and 4 (Comparison, for example, key 1 connects to the input .m blocks 3 and 4 are the second output of block 4 of the comparison (provided that the voltage of the logical unit signal is greater than Imax) or the power supply circuit of key 1. When switching to monitoring the next object, key 1 is reset to its original state. When using the device as logical voltage probe in block 7 implementation of the result, it is enough to have only the indicators Initial Coconut, More and Overvoltage, since the information about the result fleubme is represented by the redemption of the Initial state indicator. When using the device in the automatic test equipment, the implementation unit 7 may contain in addition to indicators, the elements of decoding and registration of the result of the control and the corresponding controls are also in the case of multi-alternative control (less-norm-more, sorting) in block 3 comparison the monitored voltage can compare with each of the limit values in series and / or parallel, and in the latter case the number of blocks 5 matches corresponds to the number of logic outputs of block 3. Key 1 is a magnetic control contact, the winding of which is connected to the second output of the block 4 comparisons, or a switch in the control devices. In addition, for low-46V power supply nodes, switch 1 can be performed on an integral current interrupter, an optocoupler, and a pair of photodiode-incandescent lamps, and in the latter case, with an appropriate design, the incandescent lamp, which is part of galvanized key. . In order to increase reliability, it is advisable to use the proposed technical solution in the systems of local automation of technological processes (APCS), and within the established scale there should be both the settings of the on-off controllers and the alarm-warning settings. The advantages of the proposed device are simplicity in implementation, low cost, protection from overvoltages, increased reliability of control and regulation systems with high reliability of control and wide functional capabilities.

Claims (2)

Invention Formula A device for tolerance control of voltage, containing a key, a unit for implementing the result and a source of reference voltages, the first output of which is connected to the first input of the first comparison unit, and the second and third outputs are connected to the second and third inputs of the second comparison unit, This is due to the fact that, in order to increase reliability by protecting against overvoltages, the first and and Baseline the second match block, with the first key input connected to the input terminal of the device, the key output connected to the first input of the second comparison block and the second input of the first comparison block whose output is connected to the first input of the first match block whose output is connected to the first input of the block implementation of the result, the second input of which is connected to the second input of the first coincidence unit and the output of the second matching unit, the first input of which is connected to the first output of the second comparison unit, the second output of which yong to a second input of the second block matcher, the third input block implementation result and the second input key 11354 .9 Sources of information received note in the examination 1. Copyright certificate USSR 423059, cl. G 01 R 19/16, 1971. 5 2. USSR author's certificate No. 765761, cl. G 01 R 31/02, 1978.