The color television that uses circuit of STR6309 thick film has certain amount socially, if series of Kang Jia T06, Great Wall draws the dragon series, color television that starts a few type such as dimension, Venus,all use this circuit.
Oscillation process
The volts d.c. of 300V is made an appointment with on C705, add N701 via R702, R703 (3) foot, namely the B that in-house switch is in charge of extremely, at the same time of T701 of 300V voltage classics (9) , (4) winding adds N701 (1) foot, namely the C that in-house switch is in charge of extremely, switch canal begins to guide, of T701 (9) , (4) winding produces inductive tension, via T701 coupling, in (2) , (5) winding also produces inductive tension, polarity is (5) (2) negative, t701 (5) R704 of crural voltage classics, C717 sends N701 (3) foot, make in-house switch tube current increases further, such loop makes switch is in charge of rapid saturation.
After switch is in charge of saturation, t701 (9) , (4) the voltaic linear of winding grows, t701 stores magnetic field energy, (2) , (5) winding charges to C717, the voltage that charging result is C717 Zun Duan is lower and lower, the B that makes switch is in charge of extremely voltage drops gradually, to certain hour, switch canal will quit saturated position. Once switch canal quits saturated position, criterion C pole electric current will be reduced, the inductive voltage polarity of T701 each winding retroflexions entirely, end quickly via after R704, C717 feedbacks, making switch is in charge of.
After switch canal ends, t701 (5) the voltage that the foot outputs sends N701 (5) foot, after classics N701 in-house commutate from (9) wave of filter of current limliting of crural output, R708, C708, get agreement - 7V voltage, this voltage is the working voltage of V701. In the meantime, VD709, VD706, VD710 all guides, output 120V, 12V, 26V 3 groups of voltage, namely the magnetic field of T701 interior can turn for electric energy with drive load. During switch canal ends, c717 passes R704, T701 (5) , (2) winding, reach discharge of N701 in-house diode, at the same time R702 of 300V voltage classics, R70 charges to C717, make N701 (2) crural voltage rises gradually, once make in-house switch canal guides,connect, began to issue the oscillation of one cycle.
Stabilized voltage circuit
Stabilized voltage circuit is finished by N703, N702, V701. N703 is circuit of sampling stabilized voltage, its (1) crural classics RP701 is in advocate the sampling on power source, advocate the change of voltage of power source output, can affect N703 (2) the change of crural output electric current, affected smooth Ou N702 thereby guide a degree, also guide with respect to what affected V701 a degree, through changing N701 (8) crural potential, make finally output voltage stability.
