SU1493878A1 - Electromagnetic counterbalancing scales - Google Patents

Abstract

This invention relates to a weight measuring technique. The position sensor 2 of the load-receiving platform 1 generates a signal which is fed in parallel to the input of the correction unit 4, and through the integrator 3 to the input of the modulator 16, which includes the source of the reference voltage 11, the comparator 12, the trigger 13, the integrator 14 and the generator 15 clock pulses. An increase in the speed and accuracy of the balance is achieved by the fact that the correction unit 4 and the series-connected first integrator 3 and modulator 16 form a proportional-integral-differential regulator adaptive to the measured mass. 1 il.

Description

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It refers to a nonstandard-1 technique.

The goal of the invention is to improve speed and accuracy of weights.

In the drawing, a block diagram of the scale is presented.

Scales with electrically balanced equipments contain a low reception platform 1, a sensor 2 and load load receiving platform 1, the first integrator 3, the correction unit 4, the key 5, the stabilizer 6 of the reference current, the counting circuit 7, the display unit 8, the integrator 1, 5ator 9, electromagnet 15 | Niton balancing system 0, source 11 of the reference voltage, comparator 2, trigger 13, second integrator 14, generator 15 clock pulses.

Voltage source 11, comparator 12, three1 ger 13, second integrator 14 and generator 15 form an integral pulse-width modulator 1 6,

Scales work as follows.

The signal from sensor 2 is fed to the input of the correction unit 4 and through the integrator 3 to the input of the modulator 16. At the time of combination 1 and the integral of the input signal of the modulator 16 with a constant threshold U, specified by the reference voltage source 11, the comparator 12 and the trigger trigger 13 is set to one, issuing a closure signal to the key 5. Meanwhile, the Samg.1M forms the leading edge of the pulse of the modulator 16. The falling edge is formed when the next pulse arrives from the generator of 15 clock pulses, while simultaneously About the second integrator 14. When the key 5 is closed, the output of the stabilizer 6 of the reference current is connected to the input of the counting circuit 7, by means of which the result of weighing is obtained in digital form and outputted to the display unit 8, and through the integrating adder 9 - to the input adductronic balancing

system 10, which creates a compensating force. The local feedback from the pb output to the current of the electromagnetic balancing system 10 to the input of the integrating adder 9 is used to smooth the ripple in the control loop and improve the weighing accuracy and speed. The correction unit 4 and the first integrator 3 connected in series and the modulator 16 form a proportional-integral-differential controller adaptive to the weight of the weighed weight.

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Editor M. Bandura

Claims (1)

Claims of an Electromagnetic Balance Scale containing a movement sensor of a load receptor platform 11 are connected to the inputs of the first integrator and a correction block whose output is connected to the first input of an integrating adder whose second input is connected to the output of current feedback of the electromagnetic balancing system connected to the output of the integrator c 1mator, the second integrator, the output of which is connected to the first input of the comparator, the trigger, the output of which is connected to the control the key input through which the reference type stabilizer is connected to the third input of the integrating adder and the input of the counting circuit, the output of which is connected to the input of the display unit, the reference voltage source and the clock generator, the output of which is connected to the first input of the second integrator that, in order to increase speed and accuracy, the output of the first integrator is connected to the second input of the second integrator, the output of the reference voltage source is connected to the second input of the comparator, the output of which connected to the output of the installation in one flip-flop, and the set input of which in connected to the output of the clock. Compiled by V.Shirshov Tehred MLidyk Proofreader A. Kozoriz 35 40 50 system 10, which creates a compensating force. The local feedback from the pb output to the current of the electromagnetic balancing system 10 to the input of the integrating adder 9 is used to smooth the ripple in the control loop and improve the weighing accuracy and speed. The correction unit 4 and the first integrator 3 connected in series and the modulator 16 form a proportional-integral-differential controller adaptive to the weight of the weighed weight. 20 yu 15 25 45 thirty 45 35 45 40 45 50