IX0689 power supply is widely used in TA two-chip machines of various brands in China, and it is one of the most used power sources for domestically produced machines. Oscillation circuit
The 300V DC voltage is divided by R707 and R724, and then added to the (12) pin of N701 by C735 and L701. The (12) pin of IX0689 is the B pole of the internal switch tube, so the switch tube starts to conduct and the current flows from (15). The foot C pole inflows from the (13) foot E pole, through R714, R710 to the hot ground.
The (3) and (5) pins of T701 are positive feedback windings. When the switch is turned on, the polarity of the positive feedback voltage is (5) positive (3) negative, and (5) the foot voltage is added by V735, R713, L701. To the (12) pin of the N701, the current of the switch tube is further increased, and the cycle makes the switch tube quickly saturated.
During the saturation of the switch, the electrical energy is converted to magnetic energy in the T701. As the current flowing out of the N701 (13) pin increases, the voltage drop across the R710 also increases. When the voltage drop across the R710 reaches about 1V, the switch begins to exit the saturation state.
Once the switch tube is saturated, the induced voltage polarity of each winding of T701 is reversed. The polarity of the positive feedback winding (3) and (5) is (3) positive (5) negative, and the negative voltage of (5) pin is passed through C713. R713 and L701 are added to the (12) pin of IX0689 to further reduce the current of the internal switch tube. This cycle causes the switch tube to be quickly turned off.
During the cut-off period of the switch tube, the rectifier diodes of the secondary windings of the switching transformer are all turned on, and the magnetic field energy stored in the switching transformer is converted into electric energy for the load of the whole machine, and at the same time, the (1) and (6) windings of the T701 It forms an oscillating circuit with C717, C718, R710 and C706. After oscillating for half a cycle, re-make the (6) pin of T701 to be positive (1) pin is negative, and couple it to the (3), (5) winding to make the switch tube re- Turn on. Voltage regulation process
During the off period of the switch, the voltage on the windings of T701(3) and (4) turns on the internal rectifier of IX0689(2) and (3), establishes a DC voltage of about 27V on C711, and the voltage on C711 is applied. The internal sampling reference comparison circuit of (10) and (2) of IX0689. When the grid is unstable or the 115V output fluctuates, the voltage on C711 also fluctuates. After internal sampling comparison, the output from (9) is finally adjusted, and the on-period of the switch is automatically adjusted, so that the 115V output voltage is stable. 1. When the switch tube is overcurrent, the voltage drop across R710 will also be large. This voltage is applied to (7) and (8) of IX0689 via R712 to make the internal protection tube conduct, and the switch is turned on by (9) The B-pole current shunt, that is, the current of the switch tube is limited.
2. When the grid voltage rises, the rate of current rise of the T701 primary winding during the saturation of the switch tube will increase, so that the positive feedback voltage of the (3) and (5) windings of T701 will increase, and V736 will break through. The internal pipe of the (7) leg of IX0689 is turned on, and the B-pole current of the switch tube is shunted by the (9) leg, that is, the switch tube is protected.
3. The 115V output terminal is connected with a voltage regulator V738. When the output voltage is greater than 130V, the V738 is broken down, so that the switching power supply stops.
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