PL74150B2

PL74150B2 -

Info

Publication number: PL74150B2
Application number: PL15101471A
Authority: PL
Priority date: 1971-10-14
Filing date: 1971-10-14
Publication date: 1974-10-31

Description

Nastepuje zamkniecie kluczy REi i RE3 i przeplyw pradu ii przez opornik Ri. Przeplywa¬ jacy ladunek jest calkowany przez kondensator C. 35 W chwili t2 nastepuje otwarcie 1shxay KEt i RE2.Napiecie na kondensatorze wtedy jest Uc(t2. Po- fcrany ze zródla A ladunek wynosi; Qi = C * (Ucfe) — — Uc(ti)). Jak widac ladunek ten moze byc ustalo¬ ny poprzez dobór kondensatora oraz róznicy napiec, 4a na kondensatorze C. W ukladzie mierzone jest na¬ piecie Uc jest chwila t2, w której ma nastapic odlaczenie kluczy REi i RE3.W chwili 13 nastepuje zamkniecie kluczy RE2 45 i RE4. Rozpoczyna sie faza przenoszenia ladunku do odbiornika. Warunki (1) sprawiaja, ze przez opornik R2 plynie prad i2- W chwili t$ napiecie na kondensatorze wynosi Uc{t3). Moment odlaczenia kluczy RE2 i RE4 jest wyznaczony w zaleznosci 50 od tego jaki ladunek ma byc dostarczony do od¬ biornika B. Gdy napiecie na kondensatorze Uc(t) osiagnie wynikajaca z powyzszego wartosc, naste¬ puje odlaczenie. Przeniesiony ladunek jest Q2 = = C • (Uc(t3) — Uc 55 ^przenoszenia ladunku w cyklu wielokrotnym przyj¬ muje sie Qi = Q2, co zapewnia prostote ukladu.Wtedy punkty przelaczenia sa zalezne jedynie od napiecia U^t) na kondensatorze. Ladunek dostar¬ czony do odbiornika w czasie jednego cyklu jest: 60 Q = C Powyzej opisano cykl przenoszenia ladunku do¬ datniego. Latwo zauwazyc, ze przenoszenie ladunku ujemnego bedzie mialo miejsce, gdy kierunki pra¬ dów ii oraz i2 beda odwrotne niz na fig. 1, co be- 65 dzie mialo miejsce, gdy warunki (1) przyjma postac:74150 6 Vi —V3—Uc(t)<0 (3) Uc(t) —V2 +V4<0 Poniewaz w praktycznych rozwiazaniach istnieje problem czasu przelaczenia kluczy oraz czasu re¬ akcji ukladu pomiarowo-sterajacego SCU, dla unikniecia bledów dynamicznych przyjmuje sie takie wartosci oporników Ri i R2, aby zapewnic odpowiednia (nie za duza) predkosc ladowania i rozladowywania kondensatora C.Uklad pomiarowo-sterujacy SCU ma za zadanie, zrealizowanie okreslonego cyklu pracy, na przyklad, jak opisano powyzej, kolejnosci przenoszenia la¬ dunku, zliczanie ilosci ^dawek ladunku oraz odpo-; Wiednie w zaleznosci od wykorzystywania przenie¬ sionego do odbiornika ladunku, dozowanie ladunku.Dozowanie uzyskuje sie przez -sterowanie przez uklad SCU kluczami REj, RE^ i RE4 wedlug po¬ wyzej opisanej zasady. * Kazdy impuls IW jest sygnalem do wykonania jednego cyklu przenosze¬ nia ladunku ze zródla do odbiornika. PLThe keys REi and RE3 are closed and the current flows through the resistor Ri. The flowing charge is alkalized by the capacitor C. 35 At the moment t2, 1shxay KEt and RE2 open. The voltage on the capacitor then is Uc (t2. The charge from source A is; Qi = C * (Ucfe) - - Uc ( ti)). As you can see, this charge can be determined by selecting the capacitor and the voltage difference, 4a on the capacitor C. In the system, the voltage Uc is measured, there is the time t2 when the REi and RE3 keys are to be disconnected. At the 13th moment, the RE2 keys are closed. 45 and RE4. The phase of transferring the cargo to the receiver begins. Due to the conditions (1), a current flows through the resistor R2 i2- At time t $ the voltage across the capacitor is Uc {t3). The moment of disconnecting the keys RE2 and RE4 is determined depending on what charge is to be delivered to the receiver B. When the voltage across the capacitor Uc (t) reaches the value indicated above, the disconnection takes place. The transferred charge is Q2 = C • (Uc (t3) - Uc 55 of charge transfer in a repetitive cycle is assumed to be Qi = Q2, which ensures the simplicity of the circuit. Then the switching points are only dependent on the voltage U ^ t) on the capacitor. The charge delivered to the receiver during one cycle is: 60 ° C. The positive charge transfer cycle is described above. It is easy to see that the negative charge transfer will take place when the directions of currents ii and i2 will be opposite to those in Fig. 1, which will take place when conditions (1) take the form: 74 150 6 Vi -V3-Uc (t) <0 (3) Uc (t) —V2 + V4 <0 As in practical solutions there is a problem of the switching time of the keys and the reaction time of the measurement and control system SCU, in order to avoid dynamic errors, the values of the resistors Ri and R2 are assumed to ensure the appropriate (not too high) speed of charging and discharging the capacitor C. The SCU measurement and control system is designed to carry out a specific work cycle, for example, as described above, the sequence of carrying the load, counting the number of doses to be -; Vienna, depending on the use of the load transferred to the receiver, the dosing of the load. The dosing is achieved by controlling the SCU with the keys REj, RE ^ and RE4 according to the principle described above. * Each IW pulse is a signal to execute one cycle of transferring the charge from the source to the receiver. PL

Claims

1. Patent claim A method of automatic dosing of electric charge, adapted for use in automatic control and measurement devices, especially in respirometers, characterized in that the charge is transferred from the source of charge (A) to the load receiver (B) and discharge of the capacitor (C), the processes of which are controlled by the triggering pulse (IW) signaling the need to transfer the charge, and the amount of the transferred charge is proportional to the voltage change on the capacitor (C), with one cladding (X) for the charge transfer capacitor (C) connects to the source of charge (A) and the second (Y) to the reference system (CUi), then the lining- (X) connects to the source of charge, (A) the line fs from it and connects to the receiver charge (B) and in the case of transferring the positive charge from the charge source (A) to the capacitor (C), the landing conditions are selected so that the direction of current flow from the charge source 15 (A) through the capacitor (C) to the reference system JiCJJi) there was a positive charge on the cladding - (3C) of the capacitor (C) connected to the source of the positive charge from the capacitor (C) to the load receiver (B), the discharging conditions were selected by . so that the direction of the current flow from the reference system (CUi) to the load receiver (B) is such that the positive charge on this lining (X) of the capacitor (C) decreases, and in the case of the negative charge transfer, the charging conditions and discharge of the capacitor (C) is determined analogously, but with respect to the negative charge on the cladding (X) of the capacitor (C) connected to the charge source (A) and then to the charge receiver ( B) .KI. 21e, 29/00 74150 MKP GOlr 29/00 CU, v, r, i, 5 & BLf2 RaY v3 -0- ClLn ^ a & Cf lUc (t) RE3% RLu B SCU IW - ** - CU; Fig. 1 £ -Ufo) RE, REj— 'L RE2REr J i-r * u- and download' pumping tad.j tad. Return- to the receiver dr.

2. Price: PLN 10 Krak. magic Graphic No. 3, order 732/74 PL