Abstract The invention is related to a line deflection circuit for cathode ray tubes, particularly picture tubes for TV receivers. This deflection circuit comprises a parallel resonant circuit connected in parallel with a diode and consisting of a deflection coil in series with a charging condenser in one of the parallel branches and a return trace capacitor in the other branch. In operation the resonant circuit is supplied with current from a d.c. source through an inductance, e.g. the primary winding of a line deflection transformer, and periodically short-circuited at the line deflection rate by means of a pulse controlled switch supplied with pulses from a pulse generator. According to the invention, the end of the parallel resonant circuit which is not connected with the series inductance, is connected through separate diodes with the d.c. source and ground potential, respectively, thus making the resonant circuit part of a bridge circuit.
Line deflection circuitry for cathode ray tubes, comprising: a D.C. voltage source and an inductance connected thereto; switch means connected to said D.C. voltage source through said inductance and controlled by input pulses; first and second diodes serially connected to each other between said D.C. voltage source and ground for providing a line deflection output signal; a third diode connected between said inductance at the junction of said switch means and said inductance and the junction of said first and second diodes; and a parallel resonant circuit connected in parallel with said third diode and including a deflection coil in series with a charging capacitor in one branch thereof, and a return trace capacitor in the other branch thereof.
Claim 2
Dependent Claim
119 words
Line deflection circuitry for cathode ray tubes, comprising: a D.C. voltage source and an inductance connected thereto; switch means connected to said D.C. voltage source through said inductance and controlled by input pulses; first and second diodes serially connected to each other between said D.C. voltage source and ground for providing a line deflection output signal; a third diode connected between said inductance at the junction of said switch means and said inductance and the junction of said first and second diodes; and a parallel resonant circuit connected in parallel with said third diode and including a deflection coil in series with a charging capacitor in one branch thereof, and a return trace capacitor in the other branch thereof.
Claim 3
Dependent Claim
42 words
Light deflection circuitry as in claim 1 further comprising a pulse generator for generating said input pulses and feedback means interconnecting said parallel resonant circuit with said pulse generator whereby the duration of said input pulses is controlled by said resonant circuit.
Claim 4
Dependent Claim
29 words
Light deflection circuitry as in claim 2 wherein said feedback means is connected to said parallel resonant circuit at the junction of said parallel resonant circuit with said inductance.
Claim 5
Dependent Claim
24 words
Light deflection circuitry as in claim 1 wherein said switch means is a transistor controlled to be conductive or non-conductive by said input pulses.