SU591871A1 - Voltage differentiator - Google Patents

Description

one

The invention relates to the field of computing and is intended for discrete differentiation of analog signals in automation devices.

Differentiators are known, whose operation is based on lifting voltage increments over a certain time interval.

In the differentiator 1, in the calculation of increments, diode-capacitor memory cells controlled from the keys are used. However, increments can only be obtained in areas of fast voltage measurement, which limits the operating range.

The closest to the technical essence of the invention is a voltage differentiator 2, containing operational amplifiers connected by non-inverting inputs to the input of a differentiator. The outputs of the first and second operational amplifiers through the corresponding dividing diodes connected back-to-back, are connected to one of the plates of the first storage capacitor. Another lining of which is connected to the tire of zero potential. Outputs of the third and fourth operational amplifiers

2

through the corresponding separation diodes, connected in anti-parallel, are connected to one of the plates of the second storage capacitor, the other of which is connected to the zero potential. The output of the square pulse generator is associated with a single trigger input.

The disadvantage of the device is the exhaust gas

limited dynamic range.

The aim of the invention is to expand the dynamic range of the differentiator.

The goal is achieved by the fact that the proposed differentiator contains a series-connected first delay element and an inverter, the output of which is connected to the inverting, the inputs of the first and second operational amplifiers,

and the input of the first delay element is up: switched to the output of the square pulse generator and the second delay element connected to the forward trigger output. First I remember the capacitor

connected to the inverting inputs of the third and fourth operational amplifiers. Inverse output. {Trigger connected to the inverting input of the third operational amplifier and non-inverter.

Claims (2)

the output of the fourth op amp. The output of the second delay element is associated with the zero input of the tripper. Functional diagram of the differentiator is shown in the drawing. It contains operating amplifiers 1–4, which store a condenser, a generator of 7 rectangular pulses, a trigger 8, delay elements 9,10, an inverter 11, and decoupling diodes 1215. The device works | we follow the image .-.;.;. . .- differentiable voltage U arrives at the inverting inputs amplify l. Trigger 8 is in a state where a voltage is present at its direct output. This voltage is applied to the bias inputs of amplifiers 3 and 4, and as a result, the voltage on capacitor 6 is held constant and equal to the value accumulated in the previous clock of generator 7. During the next pause of the alternator 7, which starts at time t / at the output of the inverter 11 a voltage appears, diodes 12 and 13 are applied. As a result, the voltage on the capacitor 5 and Ct,) is remembered and maintained for the entire pause of the generator. At the outputs of amplifiers 3 and 4, the input voltage increment U3 U -UCtt) (excluding the offset n These direct voltage amplifier). The pulse generator 7 (at the instant tj) of the drive "t to the triggering of the trigger 8, which removes the bias from the inputs of amplifiers 3 and 4. At the same time, through one of the opened diodes (14 or 15), the capacitor b quickly charges to the value U With a delay of time G, the trigger returns to the initial state (at tj} and locks diodes 14 and 15. At the same time, the condensate is (the voltage U (,,, (t3) -Utti is remembered) equal to the voltage applied on the interval of Plot lh ("duration of the generator pause 7). At the moment of time C, the inverter 11 is activated and removed t the voltage from the inputs of amplifiers 1 and 2, which leads to a decrease to zero voltages at the outputs 3 and 4 of the amplifiers (without taking into account the bias voltage of these amplifiers). A similar operation is repeated in each clock cycle of the generator 7, each time The output appears as a voltage equal to the increment of the DSG of the differentiated stress on the unit interval, oi. The differentiator works in a similar way when the input voltage U decreases, as well as at its negative values. In order to ensure the operability of the device during any change in voltage, the diode-capacitor cells are provided with charge and discharge input circuits. Claims of the invention A voltage differentiator containing operational amplifiers connected by noninverting 1 inputs to the input of a differentiator, the outputs of the first and second operational amplifiers through corresponding dividing diodes connected in parallel to one of the capacitors of the first storage capacitor, the other of which is connected to a zero potential bus , the outputs of the third and fourth or final operational amplifiers through the corresponding dividing diodes, including} counter-parallel no, connected to out-rdnoy rbklydok second memorizing of kondeyoa ora, and another lining k6 orrgo with 5dinena Shynoy with zero potential, and rectangular generatrr iMpulerv: $ yhod; krtor6: GB associated with unit / vhRDRm; the trigger, about tl and ch and y Shchi y-r. That is, with the purpose of expansion, dynamic range, differentiator: it contains serially connected first delay element and an inverter, the output of which is connected to the inverter inputs of the first and second operational amplifiers, and the input of the first delay element connected to the output of the square pulse generator, and the second element delays connected to the forward trigger input; moreover, the first storage capacitor is connected to the inverting inputs of the third and fourth operational amplifiers; the inverse output of the trigger is connected to the inverting input of the third-phase operational amplifier and the non-inverting INPUT of the fourth operational amplifier; the output of the second expander element is associated with a zero trigger input. Sources of information taken into account in the examination: 1. The author's certificate of the USSR, 449345, cl. G- 06 G 7/18, 1973. 2. Author's certificate of the USSR 524189, cl. & About G. 7/12, 1975.