SCR regulator for a television apparatus

A switching power supply for a television apparatus, comprising:

• a source of DC input voltage;
• a source of a deflection rate voltage;
• an energy storage inductance;
• a controllable switching element having a main current path coupled to said source of DC input voltage and to said inductance;
• a deflection rate pulse transformer coupled to said inductance and to a first load circuit;
• a control circuit coupled to said controllable switching element for switching said main current path to the conductive state each deflection cycle at a controllable instant within a first polarity interval of said deflection rate voltage to store in said inductance a controllable amount of energy from both sources;
• a second switching element coupled to said main current path, to said source of a deflection rate voltage, and to said inductance for switching said main current path to the nonconductive state during an opposing polarity interval of said deflection rate voltage, the energy stored in said inductance being depleted during said opposing polarity interval to replenish, via said pulse transformer, losses sustained in said first load circuit;
• a supply winding magnetically coupled to said energy storage inductance;
• and,
• a rectifier circuit coupled to said supply winding and to a second load circuit and poled for conduction during said opposing polarity interval of said deflection rate voltage for further depleting the energy stored in said inductance to replenish, via said supply winding, losses sustained in said second load circuit.

A switching power supply for a television apparatus, comprising:

• a source of DC input voltage;
• a first transformer coupled to said source of DC input voltage and having first and second windings;
• a first switching stage coupled to said first transformer for generating first and second switched waveform voltages in said first and second windings;
• first and second filter stages coupled to said first and second windings respectively for developing respective first and second sources of DC supply voltages;
• a second transformer having first and second windings;
• a second switching stage coupled to the first winding of said second transformer and to said first DC supply voltage for energizing said second transformer to generate switched waveform voltages in the first and second windings of said second transformer;
• a third filter stage coupled to said second winding of said second transformer for developing a third source of DC supply voltage;
• means for combining said second and third sources of DC supply voltage to develop a fourth source of DC supply voltage;
• and,
• a dynamically varying load circuit energized by said fourth source of DC supply voltage and being supplied by power derived jointly from said second and third sources of DC supply voltage, such that under heavy loading both said second and third sources of DC supply voltage supply substantial amounts of power to said load circuit.