Fly Back Coil Diagram
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The input dc source VS and switch S are connected in series with the primary (B) C R FIG. 10.11 Flyback converter: (A) circuit diagram and (B) circuit with a transformer model showing the magnetizing inductance Lm.Fig. 4(c): Circuit for a shunt flyback covert er. choke so that when the transistor switch opens, there is no arcing due to induced high voltages; and (b) it provides a path for the current in the coil to decay. Fig. 4(c) shows a shunt type flyback converter. Here, current.flows in the choke when the transistor is switched on. The diode is unable to pass current to load at this time because it is short circuited by the transistor. When the transistor opens, a high voltage is induced in the choke, which 1— THE SCHEMATIC OF THE NEGATIVE ion generator. T2 is a TV flyback transformer; only its output winding is used, and new feedback and bifilar primary windings are wound on the ferrite core. The bifilar primary winding goes to the collectors of astable Q1Q2. Its square wave induces high voltage into the flyback transformer output winding, boosted followed by a ladder voltagetripler 9 to 14 kilovolts. 120VAC TO FLYBACK TRANSFORMER FERRITE CORE FIG. 2— THE (2) Reduce the capacitor, C2, connected.at the junction of the linearity &\ and the flyback transformer to about onefourth of the value found in Whe circuit. (3) Connect the damper plate (or “Anole, in the autotransformertype oo::::::::::::: | || / W & 4 potential point compresses the left side of the picture, whereas a lowerpotential point stretches the left side. This method may, however, cause “ringing” or horizontal foldover. (4) Use a higher inductance width coil to stretch the right side of the Note that the transformer is an exact replacement item, as are other shaded areas and components on the diagram. The flyback transformer has builtin (integrated) HV rectifiers to develop 18 kV for the CRT anode. As with many modern sets, no HV adjuster is.provided. Focus and screen controls feed lower dc voltages to the corresponding gun elements. Note the arc gaps tied to the gun elements. This set employs an adjustable PM unit for convergence, so there is no need for an FLYBACK LVPS SPICE2 EQUIVALENT CIRCUIT The equivalent circuit of the example flyback regulator for the SPICE2 circuit analysis program is given in Figure 2. Each node is given a unique numeric name and the circuit elements are named. Sub circuit models are used for several circuit blocks such as the flyback transformer primary and switch (XI, X2 and LP), the transformer secondaries (X3, X4, X5, X6, and X7) , and the SG1524 regulator (X8). These subcircuit models greatly Highfrequency flyback transformer linked utilityconnected.inverter 1 = 0 sawtooth carrier wave signal wave MsinflM • i »jgu<u wave m&Hil Tul , Tv2 on S a n n n n n gate pulse train Tu2 . Tvl on n d nnnnn primary/secondary currents Fig. 2. Control diagram of highfrequency flyback transformer linked utility connected sinewave inverter The control signals and the current operating waveforms are illustrated in Fig.2. For the simplicity, the highfrequency sawtooth carrier waveform is This requires a large current through the deflection coils. Thus, the flyback transformer is connected as a voltage stepdown, or current stepup, device for the deflection coil circuit. To preserve power, this secondary winding has an impedance close to that of the deflection coils. As explained.more fully later, the brief retrace period produces selfoscillations, and a special damper diode is used to absorb these oscillations. The energy from the first negative peak in these oscillations is The selfoscillating horizontaldeflection circuit. essentially the same drive waveform as that obtained from an oscillatordriven discharge circuit, the selfexcited horizontal system behaves as a normal horizontal sweep amplifier during the scan period. During that time the tube current increases. There are small oscillations on the waveform caused by various resonances in the flyback transformer. The changing plate current induces a positive voltage in the feedback transformer r I L An open yoke or flyback transformer can cause.excessively high voltages to appear across the trace SCR or diod'e and damage them. Ordinary capacitors cannot be used to replace CR or the other capacitors in the circuit because they are not designed to have small enough losses. I514 tho vacuum tubo horizontal output ampllflor The schematic diagram of a horizontal output amplifier and its associated circuits commonly found in color receivers is shown in Figure 1524.