What is the voltage that supply the horizontal output transistor?
All output stages drive a sawtooth current into the primary winding of the flyback transformer and receive power from the main B+ supply. The B+ supply can deliver peak currents of several amps while maintaining a regulated voltage of about 130 VDC.
What is horizontal flyback?
The flyback transformer circuit was invented as a means of controlling the horizontal movement of the electron beam in a cathode ray tube (CRT). Unlike conventional transformers, a flyback transformer is not fed with a signal of the same waveshape as the intended output current.
What is the function of horizontal section in CRT TV?
As in the vertical system; there is generally a driver between the Television Horizontal Deflection Circuit oscillator and the horizontal output stage. Its function is to isolate the oscillator and to provide drive power for the horizontal amplifier.
Why does horizontal output transistor keep blowing?
Other possible causes: Improper drive to horizontal output transistor (HOT). A weak drive might cause the HOT to turn on or (more likely) shut off too slowly (greatly increasing heat dissipation. Check driver and HOT base circuit components.
What is a ZVS driver?
The ZVS Driver circuit is a Royer-type push-pull oscillator with a resonated primary that is implemented with FETs. This type of oscillator can be used to drive the ferrite core of a flyback transformer to generate high voltage. It can also drive a high-current air-core “work” coil for an induction heater.
What is damper diode?
Damper Diode: A diode implemented to reduce voltage spikes. The diode is normally positioned anti-parallel [cathode to collector, anode to emitter] across a Collector-Emitter junction of a transistor.
What is horizontal circuit?
A horizontal deflection circuit makes a sawtooth current flow through a deflection coil. The current will have equal amounts of positive and negative current. The horizontal switch transistor conducts for the right hand side of the picture. The damper diode conducts for the left side of the picture.
What is horizontal section?
Definition of horizontal section : a section representing an object as cut horizontally through its center.
How is flyback voltage calculated?
The flyback voltage VOR is equal to VO (the secondary Vout plus the VF for the secondary diode D6) multiplied by the transformer winding ratio Np:Ns. Setting the flyback voltage VOR determines the winding ratio Np：Ns and the Duty ratio.
Why is it called flyback?
The “flyback” name is due to the sudden stop/stop, on/off action of the MOSFET switch, with a waveform that looks like a sudden reversal of current flow (Fig. 3). Regulation of the output is achieved by adjusting the on/off duty cycle of the primary-side switch.