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It’s an open platform for all electrical Electronic TV technology to have its few, but NOT last, ab5900 of fame in a working, hand-on environment. The previously described SCR regulated power supply is not economically incorporated in a receiver which provides input and output terminals electrically isolated from the ac line.
AN5900 Datasheet PDF – Matsushita
Truly, it is the high point of all Western civilization. Transformer 15 also includes a number of secondary windings and a tertiary winding 23, which generates a high voltage of the order datahseet 25 KV at an ultor terminal 24 to be applied to the anode of a kinescope not shown. Thus, expensive audio and video isolation transformers may be required.
Sampling of any of the other load circuit supply voltages could also be done. The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price datasueet faded from memory Post a Comment The most important thing to remember about the Comment Rules is this: Or are not being collected nowadays in proportion to their significance or prevalence in their heyday, this is bad and the main part of the death land.
Inductive energy is stored in winding 14 and in the magnetically permeable core of transformer When this energy is depleted, current datasheett ceases.
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Many contemporary “televisions” more correctly named as displays would an9500 have this level an59000 staying power, many would ware out or require major services within just five years or less and of course, there is that perennial bug bear of planned obsolescence where components are deliberately designed to fail and, or manufactured with limited edition specificities This invention relates to regulated power supplies for television receivers and in particular to switched mode power supplies having transformers for regulating load circuit voltages.
Close magnetic coupling between the primary winding 14 and supplemental winding 41 as a result of the layer winding arrangement produces accurate regulation of the supplemental winding voltage.
The circuit described in that application includes a transistor switch which permits current from an unregulated voltage supply to energize a primary winding of the high voltage transformer. Dagasheet previously described, it may be desirable to provide the receiver with an59000 video and audio input and output capability in order to interface external components, such as video sources, home computers or separate audio equipment, with the receiver.
Among the secondary windings shown as comprising transformer 15 are winding 25, which provides a voltage which is rectified and filtered to develop a direct voltage of the order of volts at a terminal 26 that may be used, for example, to power the kinescope drive circuits not shown.
These input datassheet output interface terminals must be accessible by the user of the television receiver, yet provide a5900 isolation from the ac line to eliminate any shock hazard. As the load circuit power requirements decrease or the ac line voltage increases, transistor 16 conducts for a shorter period of time each horizontal interval, as shown by the dashed lines in the waveforms of FIG. This in turn energizes the electrically isolated load circuit windings in order to power the associated load circuits.
Under certain severe receiver operating conditions, such as low ac line voltage, receiver start-up, or high load circuit power requirements, there may be insufficient power transferred between primary winding 14 and the load windings to maintain accurate regulation of the load circuit datasjeet voltages. Comments on this blog may be blocked or deleted at any time. Transistor 16 is rendered conductive by a switching signal at a time t 1 from regulator control circuit 22, for example Matsushita AN, being applied to the base of transistor 16, thereby raising the base-emitter voltage V Catasheetas shown in FIG.
The potential difference between primary winding 14 and supplemental winding 41 is relatively small, as contrasted to the potential difference between primary winding 14 and high voltage winding 23, for example.
AN5900 Datasheet PDF
The catch dattasheet is needed to remove the remaining stored energy from the primary winding to prevent inductive switching transients from damaging receiver components. Decreases in the ac line voltage or increased circuit loading will cause an increase in the SCR conduction time and an increase in line voltage will result in a decrease in SCR conduction zn5900.
An intermediate tap 42 on winding 41 provides a low voltage source of the order of 16 volts via a diode 43 and a capacitor 48 at a terminal datzsheet The voltage represented by the spike in FIG.
The tight magnetic coupling between primary winding 14 and supplemental winding 41 causes winding 41 to act as a clamp winding which limits the extent to which the collector voltage of transistor 16 can increase. Limiting the switch duty cycle also limits datasheett amount of energy that may be transferred to the load windings which may limit the ability of the power supply to accurately regulate the load circuit voltages under extreme line voltage and circuit loading conditions.
A supplemental transformer winding aids in transferring power to the load circuits.
AN Datasheet, PDF – Alldatasheet
The collector-emitter voltage of horizontal output transistor 31 V BE31illustrating the horizontal retrace pulse, is shown in FIG. A whole nation was built on the idea of datashret quality before quantity in all things. This occurs because winding 41 expeditiously removes much of the energy from winding 14, as previously described, so that a relatively small amount of energy remains.
To prevent a degradation of the voltage regulating capabilities of the receiver under these conditions, a supplemental winding 41 of transformer 14 is provided and operates in the following manner. In this way, the load circuits which are coupled to the interface connectors will be electrically isolated from the ac line.
As previously described, a reduction in the windings’ magnetic coupling also reduces the amount of energy or power that may be transferred between the primary and load windings. Sampling of the volt supply is shown for example only. It is desirable to simplify the construction of the voltage regulating power transformer, yet provide the ability to accurately regulate the load voltages under the previously described extreme line voltage and circuit loading conditions.