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US 4,393,337 AGranted
Switching circuit
AssigneeSony Corporation
InventorsTamiji Nagai, Takeshi Matsushita
Life of this patent
Estimating the term…
Abstract
First and second gate-controlled switches are connected analogously to a Darlington transistor pair with a slow-response diode connected to delay application of a turn-off signal to the second gate-controlled switch until the first gate-controlled switch is fully turned OFF. The Darlington-type connection reduces a drive current required from a driving source to maintain the second gate-controlled switch fully ON for passing a load current therethrough.
Claims10
A switching circuit comprising:
- a first three-junction gate-controlled switch having a first anode electrode, a first cathode electrode and a first gate electrode, said first gate-controlled switch requiring a predetermined time to go from an ON to an OFF condition,
- said first gate electrode being an input terminal of said switching circuit;
- a second three-junction gate-controlled switch having a second anode electrode, a second cathode electrode and a second gate electrode;
- said first and second anode electrodes being connected together;
- said second cathode electrode and said second anode electrode being first and second load terminals of said switching circuit connectable in series with a current path of a load for the control of current therethrough;
- said first cathode electrode being connected to said second gate electrode for driving said second three-junction gate-controlled switch by current from said first cathode electrode to said second gate electrode;
- and a diode having a cathode terminal connected to said first gate electrode and an anode terminal connected to said second gate electrode, said diode having a delay time for changing from a non-conducting to a conducting condition, said delay time being longer than said time required for said first gate-controlled switch to go from said ON to said OFF condition.
4 more elements
A horizontal deflection circuit for a television system comprising:
- a horizontal oscillator producing a repetitive signal having first and second voltage levels;
- a switching circuit having a first three-junction gate-controlled switch which has an ON condition and an OFF condition, a second three-junction gate-controlled switch which has an ON condition and an OFF condition;
- said first and second gate-controlled switches being connected in a Darlington-type connection;
- said switching circuit having an input terminal and first and second load terminals;
- a damper diode connected in parallel with said first and second load terminals;
- a resonant capacitor connected in parallel with said first and second load terminals;
- a deflection coil connected in series with an S-shape correction capacitor, the series connection of said coil and correction capacitor being connected in parallel with said first and second load terminals;
- a fly-back transformer having a primary winding and a secondary winding;
- said primary winding being connected in series with a power supply source and the series connection of said primary winding and power supply source being connected in parallel with said first and second load terminals;
- means responsive to said first voltage level of said horizontal oscillator for applying a positive voltage to said input terminal and responsive to said second voltage level of said horizontal oscillator for applying a negative voltage to said input terminal;
- and delay means for delaying change of said second gate-controlled switch from its ON to its OFF condition until after said first gate-controlled switch is changed from its ON to its OFF condition.
8 more elements
A horizontal deflection circuit for a television system comprising:
- a deflection coil;
- a fly-back transformer;
- a damper diode;
- a resonant capacitor;
- said deflection coil, fly-back transformer, damper diode and resonant capacitor being connected together and constituting a load;
- a horizontal oscillator producing a repetitive signal having first and second voltage levels;
- a switching circuit having an input terminal and first and second load terminals;
- said load being connected to said first and second load terminals;
- said switching circuit including a first three-junction gate-controlled switch having a first gate, a first anode and a first cathode and a second three-junction gate-controlled switch having a second gate, a second anode and a second cathode;
- said first gate being connected to said input terminal;
- said second cathode being connected to said first load terminal;
- said first and second anodes being connected to said second load terminal;
- said first cathode being connected to said second gate;
- means responsive to said first and second voltage levels for applying positive and negative signals to said input terminal;
- said first and second gate-controlled switches having ON and OFF conditions;
- and delay means for delaying a change of said second gate-controlled switch from said ON to said OFF condition until said first gate-controlled switch has completed a change from said ON to said OFF condition.
13 more elements
Dependencies are inferred from the claim text.