SU1208520A1 - Apparatus for tolerance inspection of constant voltage - Google Patents

Abstract

The invention relates to measuring instruments in which the measured value is automatically compared with the reference value. The purpose of the invention is to increase the reliability of control and simplify the device by eliminating a false signal. The device contains a voltage amplitude limiter 2 consisting of a resistor 3 and a diode 4, a voltage amplitude limiter 5 comprising a resistor 6 and a diode 7, two dividers 8 and 9 voltage and an operational amplifier 10 with differential inputs. 1 il. i b r-

Description

The invention relates to measuring instruments in which the measured value is automatically compared with the reference value.

The purpose of the invention is to increase the reliability of the controls and controls, eliminating the setting of the device by eliminating the possibility of a false signal.

The drawing shows a diagram of the device for the case of a positive control pressure.

It contains an input bus delimiter 2 voltage amplitude, consisting of a resistor 3 and a diode 4, one of which is connected to a voltage source, limiter 5 of the voltage amplitude, consisting of a resistor 6 and a diode 7, one of which is connected to a source of voltage S two splitter 8 and: 9 voltage, operational amplifier 10 with differential inputs, output bus 1I.

In the device, the input bus is connected to the input of the limiter 2 of the voltage amplitude and connected to the input of the limiter 5. The output of the limiter 2 through the voltage divider 8, consisting of two resistors, is connected to the non-inverting input of the operational amplifier 10. The output of the limiter 5 is the voltage amplitude through a divider 9, consisting of two resistors, is connected to an inverter: the left input of the operational amplifier 10, the output of which is connected to the output bus 11

It should be noted that the voltage amplitude limiter 2 is the maximum value limiter j, i.e. at its output, the voltage value does not exceed the voltage value of the reference source -i-Vp. The voltage amplitude limiter 5 is the minimum amplitude limiter, i.e. its output voltage value is not less than

UPUP is working in the following way.

Suppose that the source of the reference voltage -J-Vj ,, has zero internal resistance; input resistance of the dividers 8 and 9 ve j) 3iKO and their influence on the magnitude of the output

five

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08520, 2,; ,

input voltage limiters 2 and 5 can be neglected.

Also suppose that in the initial state the input voltage is

S is greater than Vftn Then, at the output of the limiter 2, the voltage is equal to Vj, and at the output of the limiter, 5 is equal to the input voltage. The voltage from the outputs of the limiters 2 and 5, respectively, through the dividers 8 and 9 to the non-inverting and inverting inputs of the operational amplifier 10. In this case, the transfer ratio of the splitter 8 is chosen greater than the transfer ratio of the splitter 9. more than the magnitude of the signal at the inverting input is obtained, so the maximum positive voltage (Norma signal) is present on the output bus 1 of the device. If the input voltage further increases, the magnitude of the signal at the inverting input of the amplifier also increases, with a constant value at the non-inverting input. And as soon as the voltage level at the inverting input exceeds the voltage level at the non-inverting input, a minimum negative voltage will be generated at the device output (No normal signal)

35 Consider the operation of the device when the input voltage changes from the initial state downwards. It is obvious that until the input voltage does not reach the magnitude of the voltage, no changes will occur in the device. When the input voltage is equal to the outputs of the limiters 2 and 5 there is a voltage equal to + V. But since

45 the transfer ratio of the divider 8 is greater than the transfer ratio of the divider, then the HCN. The device bus 11 maintains the maximum positive voltage: i.e. signal

50 Norm. With a further decrease in the input voltage at the output of the limiter 5, the voltage will remain equal to Vpj, and at the output of the limiter 2, the voltage will decrease. Wherein

55 as the transfer ratio of the divider 8 is greater than the transfer ratio of the divider 9, the tone to the device bus 11 is kept maximum

thirty

positive voltage / signal Normal) until the signal level at the non-inverting input of amplifier 10 becomes less than the signal level at the inverting input, after which operational amplifier 10 generates a No-Normal signal (minimum negative voltage),

Claims (1)

Invention Formula A device for the tolerance control of a constant voltage containing an operational amplifier with differential inputs, the first 08520 A diode limiter whose input is connected to an input of a device, characterized in that, in order to increase the reliability of monitoring and simplifying device tuning, a second diode limiter and two voltage dividers are introduced into it, the inputs of which are connected respectively to the outputs of the first and 10 second diode limiters and outputs - with the corresponding inputs of the operational amplifier with differential inputs, the output of which is connected to the output of the device, input 15 of the second diode limiter is connected to the input of the device.