High voltage deflection circuit
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTomonari Oogami, Takahumi Nagasue
Life of this patent
Estimating the term…
Abstract
A resonant pulse voltage having a positive polarity is applied by a first resonant circuit and a third resonant circuit to a horizontal deflection coil included in the first resonant circuit, and a resonant pulse voltage having a negative polarity which is opposite to that of resonant pulse voltages applied by the first resonant circuit and the third resonant circuit is applied to only a horizontal deflection coil in the first resonant circuit without being applied to a transistor by a second resonant circuit.
Claims19
A high voltage deflection circuit for supplying a deflection current to a deflection coil, comprising:
- a first resonant circuit including said deflection coil that applies a first resonant pulse voltage to said deflection coil;
- a switching circuit connected to said first resonant circuit that performs a switching operation in response to a predetermined drive signal;
- a second resonant circuit, connected in series with said deflection coil and supplied with a drive voltage by a resonance operation of said first resonant circuit, that applies to said deflection coil a second resonant pulse voltage having an opposite polarity to that of said first resonant pulse voltage;
- and
- a third resonant circuit, connected in series with said first resonant circuit through said second resonant circuit, that performs a resonance operation in response to the switching operation of said switching circuit.
A high voltage deflection circuit for supplying a deflection current to a deflection coil, comprising:
- a first resonant circuit including said deflection coil that applies a first resonant pulse voltage to said deflection coil;
- a switching circuit connected to said first resonant circuit that performs a switching operation in response to a predetermined drive signal;
- a second resonant circuit, connected in series with said deflection coil and supplied with a drive voltage by a resonance operation of said first resonant circuit, that applies to said deflection coil a second resonant pulse voltage having an opposite polarity to that of said first resonant pulse voltage;
- and
- a voltage supply circuit that supplies a drive voltage to said second resonant circuit until said second resonant circuit starts a resonance operation, wherein
- said voltage supply circuit comprises
- a DC power supply, and
- a second switch that supplies a voltage to a first switch as the drive voltage from said DC power supply until said second resonant circuit starts the resonance operation.
A high voltage deflection circuit for supplying a deflection current to a deflection coil, comprising:
- a first resonant circuit, including said deflection coil, that applies a first resonant pulse voltage to said deflection coil, said first resonant circuit being supplied with electric power through a first coil of a deflection transformer connected to a power supply;
- a switching circuit, connected to said first resonant circuit, that performs a switching operation in response to a predetermined drive signal;
- and
- a second resonant circuit, connected in series with said deflection coil and supplied with a drive voltage by a resonance operation of said first resonant circuit, that applies to said deflection coil a second resonant pulse voltage having an opposite polarity to that of said first resonant pulse voltage,
- said second resonant circuit comprising
- a resonant capacitor,
- a current-voltage converter that converts a current flowing through said resonant capacitor into a voltage to produce a switch drive signal, and
- a switch that performs a switching operation in response to the switch drive signal, said switch being connected in parallel with said resonant capacitor and supplied with a voltage obtained by smoothing a pulse voltage as a power supply voltage, said pulse voltage having an opposite polarity to that of said first resonant pulse voltage and being induced in a second coil of said deflection transformer by said first resonant pulse voltage.
Dependencies are inferred from the claim text.