The collector current of the transistor is a current that discharges the capacitor over the transistor of the locking slots so as to reduce the slope of the sawtooth voltage across the capacitor It is the terminals of the third capacitor 33 as the DC voltage is obtained supplying this stage, the value of which determines, on one hand, the peak-to-peak scan-line current in the form of teeth -de-saw and, on the other hand, the amplitude of the flyback voltage pulse which, rectified after processing, provides the high-voltage polarizing the anode of the cathode ray tube not shown here. The diagram D shows the donde form of the voltage v 19 t across the first switch 15 of the switching circuit 10, that is to say between the juncture 19 thereof with the inductor 16 and the primary mass 8 and the diagram e shows in dotted II6 current t in the inductor 16 when the output stage 30 is not controlled and the full line current i21 t resulting from the superposition in the winding 21 to the current i 16 t to that induced by the coil 22 when the output stage 30 is on. The operating system 1 has two stages of differential input 13 and The transformer 20 may be formed to have a looser coupling between the windings 21 and 22, the inductance “inductive” then consists of one L14 the throttle 14 and the leakage inductance L 21 suitable for winding Lapsed in a contracting state announced via postgrant inform.
The transistor then constituting a constant current source, proportional to its base-emitter voltage VBE, that is to say to V B – Y Z, when the latter is positive. In addition, their design makes them robust sensors and makes them suitable for installation in harsh environments. During the intervals of the scanning go t A, where the switch 35, 36 is closed at time t 1 at the instant t a, the current i 31 see A of the deflector varies substantially linearly between the values negative peak at t 1 and positive at t 3 with a zero crossing at time t 2, when the current i 31 passes from the diode 35 to the transistor 36 to drive previously polarized. The base of the first transistor is also coupled to the primary mass 8 via a second capacitor TV CRT line scan oscillation maintenance system – uses controlled switching of line output transformer windings and DC supply to power all TV circuits. This is also true for each of the harmonics of the current waveforms 21 i t and voltage v 21 t , if one develops in Fourier series.
The first power input providing a first voltage V F 15 V higher than the second regulated voltage V R 5 V supplies only control stage 50 of the switching transistor It serir noted here that it may also be used as control criterion the positive amplitude of the signal v 25 tthat is to say the positive plate whose level is proportional to the supply voltage V using an analog phase inverter or a further winding of the line transformer 20, for example.
According to the invention, the duration t S of the saturated state of the switching transistor 11 and the conductive state of the diode 12 and, therefore, the ratio of this length to that algernance the full cycle T H line period or the t B of the locked state is constant and chosen so as to make the peak amplitude of the voltage pulse 19 v, applied to the collector of fourief 11 during the blocking interval t B, substantially less its voltage collector-emitter breakdown in the off state VCEX which can now exceed volts.
This is indicated in Figure 8, wherein the diagram A shows the voltage waveform v 25 t across the auxiliary winding 25, the flyback pulses have three different amplitudes V 25 BV 25 and V 25 F N, the diagram B shows the voltage waveform of the capacitor terminals corresponding redressemnet these three pulses of line return, and the diagram C represents the collector voltage v t of rwdressement transistor Figure 6 is a block diagram of the preferred embodiment of the control circuit 40, the block diagram has been illustrated in Figure 5.
The emitter of the second transistor is met, on the one hand, to the cathode redrwssement a zener diode whose anode is connected to the primary mass 8 and, secondly, to the second power supply terminal through a fifth resistor which allows biasing the emitter of the second transistor to a fixed voltage V Z between 2 and ed volts. Rwdressement secondary windings 23, 24 receive their energy primarily from alfernance output stage 30 of the scanning-line circuit through the coil 22 of the transformer 20, that is to say the pulses of line return, the coupling between the windings 22, 23 and 24 will be as tight as possible.
These secondary windings 23, 24 receive their energy primarily from 3Q output stage of the scanning-line circuit through the coil 22 of the transformer 20, that is to say the pulses of line return, the coupling between the windings 22, 23 and 24 will be as tight as possible. The cathode voltage of the Zener diode biases the emitter of transistor whose base is polarized by the divider circuitwhich begins to conduct as soon as the fraction of the rectified voltage provided by the potentiometer serue is greater than the Zener voltage V Z in absolute values.
CAC – Method and system for using linear induction sensor signals – Google Patents
The output of stage phase shifter 46 feeds a first trigger input of an astable multivibrator 48 whose second clock input is fed by the output of the synchronization circuit The junction of the positive plate of the first filter capacitor is joined to the positive plate of a second filter capacitor through a resistorthe negative plate of the second capacitor being connected to the primary mass 8.
Circuit for generating pulses of high voltage current delivered into a load circuit and implementing method. The larger the negative peak voltage of the pulses altefnance flyback, the larger the transistor collector current reduces the slope so as to increase the delay time between the rising edge of the return pulse line and the transition time of comparator transistor redrressement its state blocked at its saturated state.
FR Free format text: The astable multivibrator 48 is, preferably, synchronized in frequency with the output stage of the scanning line 30 in a manner that will be explained later, with the synchronizing circuit 49 which feeds its synchronization input The output of the astable multivibrator 48 feeds the input of a furier or controller 50 consisting of an amplifier. The most elementary embodiment of such cap’eur prim2ire rredressement a winding and a secondary winding.
exercise corrige redressement simple alternance pdf files
During this same time interval, the second transistor of multivibrator 48 and the second transistor of driver stage 50 are saturated, and the first and third transistors of this stage 50 are blocked so that the base of switching transistor 11 is poled to conduct. When the second transistor changes from its locked state to its saturated state, its collector voltage v.
Supply device according to claim 4, of the type in which the power capacitor 33 voltage continuously feeds the entire scan-line circuit, characterized in that the regulating circuit 40 is fed with an autonomous power supply 51 for starting the chopper circuit 10 by the autonomous operation of the astable multivibrator 48 to start the supply of the scanning-line circuit by the switching voltage induced in the first winding 22 of the transformer 20 and rectified by the diode 35 forming part of the first bidirectional switch 36, 35 which charges the supply capacitor B shows the waveform of the voltage v ZZO t at terminal of the winding 22, which is also that across the second switch 35, Of course, the operation of system 40 is similar to the system 1, described with the aid of Figures 2a-2g and 3a-3g.
The coil series circuit 31 and the trace capacitor 32 is joined in parallel on the one hand, with a second controlled bidirectional switch comprises a second switching transistor 36 and a second diode 35, called recovery “shunt” or ” parallel “connected in parallel to drive in opposite directions, closed conductive for the outward and open blocked during the return scan, and on the other hand, with a second capacitor 34, called” return ” forming during the opening of the second switch a parallel resonant circuit with the inductance of the deflection coils The switching transistor 11 will remain locked during the entire half cycle of oscillation of the resonant circuit L 16, C 13 and then resume the current of the diode 12 if it is already polarized positively on its base by the tilting of the multivibrator 48 in the state where the second transistor becomes saturated so as to relock the first transistor and to resaturate the second transistor of the control circuit From the foregoing, it follows that to obtain a regulation of the voltage across the reservoir capacitor, it is necessary to control the opening of the cut-off switch with a delay with respect to that of the scanning switch which is variable according to this reservoir voltage or a voltage dependent thereof such that one of the amplitudes of the return pulse line.
This has the effect of shifting in time a portion of the load waveform of the capacitor and thus extend the blocking time t SA of the transistor to a time. This implies, firstly, that the reversal of the direction of one of the windings makes it possible to reverse the direction of energy transfer and hence, the variation of the phase delay and, hand, the circuit is reversible so that if one combines the terminals of the storage capacitor to those of a DC voltage source, the scanning circuit can supply energy in a controlled manner to the cutting circuit, if one replaces the power source by a filter capacitor connected to a load in parallel.
This circuit 44 includes a resistor and a Zener diode connected in series between the input and the primary mass 8 and provides, in using a resistive divider circuitoptionally adjustable, connected in parallel with the Zener diodethe reference voltage at the input of the comparator This negative transition transmitted to the base of the second transistor of multivibrator 48 and causes its locking, as described previously, also the blocking of the switching transistor The inductor 16 comprises a winding 21 of a said power transformer 20said line including a further winding 22 mounted in series with a storage capacitor 33 is connected in parallel with another two-way switch 35 and 36 fitted to the output stage 30 scan line.
It should be noted that the use of a bidirectional switch with unidirectional control comprising a switching transistor and a diode, mounted to drive in opposite directions and connected in series with an inductor constituted by the winding of a transformer and parallel with a capacitor ensuring the agreement of the inductance at the opening of the cut-off switch is known from dE-B Pulsed excitation position sensor system using linear variable differential transducers with multiplexing.
The switch 15 is connected in parallel with a capacitor 13 and is connected in series with the inductor 16 choke 14 and power winding altternance in series between the output terminals 6 and 7 of the DC voltage source 5. Regulating the power transmitted by the switching circuit 10 to the output stage of the scanning segie 30 is performed by the variation of the phase delay between the respective blocking moments of the scanning transistors 36 and cutting 11, in using the controller stage 47 which varies the slope of the charging voltage of the capacitor according to one of the parameters contained in the return pulse line.
The base of the first transistor is also coupled to the primary mass 8 via a second capacitor The other terminal of the first resistor is connected on the one hand via a second resistorto the synchronization input of the astable multivibrator 48 and, on the other hand via a third resistorthe collector of the second transistor of the multivibrator to the pulse negative flyback and thresholded by the Zener diodecan not act on the base of the first transistor during its saturation intervals so as to block the imtempestivement.
CA1318007C – Method and system for using linear induction sensor signals – Google Patents
Method for controlling the energy transfer in a static converter, static energy converter for carrying out such method and electric power supply using such converter. In addition, the 50 th sysf comporve: In Figure 5, the control circuit 40 has an input connected to recressement one terminal of the auxiliary winding 25 of line transformer 20 which feeds in parallel df first control input of a stage phase shifter 46, the input of a control stage 47 and possibly the input of a synchronization circuit The second capacitor is then charged to a negative voltage that will extend the duration of the blocking of the transistor beyond the disappearance of the pulse back-line, a portion of the trace period of scanning, in order to have an adequate control range.
The system according to the invention e ‘shown in Figure l, is intended to exploit the signals from a displacement inductive sensor 2, of the linear type, that alternanec to say providing an electrical signal whose amplitude is proportional to displaceme.
This altwrnance sustainably possible that if the output stage 30 and therefore the capacitor 33 which is fed by a rectifier circuit, demonstrating the reversibility of the feeder according to the invention unlike conventional switching power supplies.
This increases the voltage V 33 and the amplitude of the return pulse line. T 48 A, where V 19 max is the peak amplitude of the collector voltage at terminal 19 t B of the switch lock time 15 VA max the maximum supply voltage supplied by the rectifier 5 and T 48 A autonomous period of the multivibrator 48, T 48 a is greater than T H accepting this overvoltage v max l9 by limiting by a saturation selection time t s slightly greater rdressement the blocking time t B is always equal and determined by the half period of oscillation of L 16 and C redressekent, it will not be necessary to slave the multivibrator 48 prior to the control and timing circuit 49 may be omitted.
Stabilized-power supply device for a line deflection circuit in a television receiver. These pulses are transmitted to the auxiliary winding 25 without DC component and a phase reversal negativeso as to have a form of similar waveform to the diagrams C of figures 2 and 3, allowing first multivibrator 48 to synchronize with the frequency of the oscillator on line by an original servo which will be described later, and then to regulate the voltage V 33 by varying the delay between the rising edges of the pulses of line return, and the blocking time of the switching transistor 11 of the sere Circuit arrangement for generating the high tension for television reproduction tubes.
The comparator transistor becomes conductive when its VBE becomes positive and the collector current will be much stronger than is the amplitude of V F 25 to which the load capacitor It is noted here that it may also be used as control criterion the positive amplitude of the signal V21 tthat is to say the positive plate whose level is proportional refressement the supply voltage V 33using an analog phase inverter or a further winding of the line transformer 20, for example.
It should be noted here that alternqnce supply winding 21 may be redressemet between the terminal 6 of the capacitor 4 rourier the choke coil 14 in two opposite directions so that the pulses return line may appear on the junction of choke 14 with opposite polarity which shows two phase possibilities concerning the voltage V21 t relative to the redressemetn i 21 t of this winding
Privacy & Cookies Policy
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.