1. Vibration circuit: the leakage-source and R4 of the main winding N1 and Q1 of the switching transformer are the channels of the power supply operation current; R1 provides the starting current; The self-powered windings N2, D1, and C1 constitute the power supply voltage of the vibrating chip. The normal operation of these three links is a prerequisite for the power supply to be able to vibrate.
Of course, the 4-pin external timing elements R2 and C2 of PC1 and the PC1 chip itself also form part of the vibration circuit.
2. Voltage stabilization circuit: +5V power supply of N3, D3, C4, etc., R7-R10, PC3, R5, R6 and other components constitute a voltage stabilization control circuit.
Of course, the PC1 chip and the 1 and 2 pin peripheral components R3 and C3 are also part of the voltage regulation circuit.
3. Maintenance loop: The PC1 chip itself and the 3-pin peripheral component R4 constitute an overcurrent maintenance loop; The D2, R6 and C4 components connected in parallel on the N1 winding constitute the maintenance circuit of the IGBT; In essence, the voltage feedback signal of the voltage regulation circuit - the voltage regulation signal can also be regarded as a voltage maintenance signal. However, the content of the maintenance circuit is not limited to the maintenance circuit itself, and the start and control of the maintenance circuit is often caused by the abnormality of the load circuit.
4. Load circuit: N3, N4 secondary winding and subsequent circuits, all of which are load circuits. The abnormality of the load circuit will involve the maintenance circuit and the voltage regulation circuit, so that the two circuits can make corresponding maintenance and adjustment actions.
The vibrating chip itself participates in and constitutes the first three circuits, and if the chip is damaged, the three circuits will be shut down together. The maintenance of three or four circuits is carried out under the premise that the chip itself is normal. In addition, like playing chess, we should use the overall concept and system thinking to identify faults, and see the essence through phenomena. If the vibration stop is not caused by damage to the vibration circuit components, it may be caused by a voltage regulation circuit defect or an abnormal load circuit, which causes the internal maintenance circuit of the chip to start control, and the output of the PWM pulse is suspended. It is not possible to completely isolate each circuit for maintenance, and the presentation of a faulty component is likely to show the effect of "pulling a hair and moving the whole body".
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