source:Industry News Popular:adapter release time:2022-02-18 10:16:49 Article author:sznbone
The main circuit model of a variable frequency power switch can be simplified as the following diagram, and the key elements in the circuit have been included. After removing the complex appearance, what remains is the important place in the circuit. This is the circuit diagram of the simplified circuit in physics. The main context is clearly presented, so that we can better understand and grasp it. The following small series of industrial power supply will give you a brief introduction:
1. Oscillation circuit: The drain-source and R4 of the main windings N1 and Q1 of the switching transformer are the paths for the working current of the power supply; R1 provides the starting current; the self-powered windings N2, D1, and C1 form the power supply voltage of the oscillating chip. The normal operation of these three links is a prerequisite for the power supply to oscillate.
Of course, the 4-pin of PC1 is connected to the timing components R2, C2 and the PC1 chip itself, which also constitute a part of the oscillation circuit.
2. Voltage stabilization circuit: +5V power supply of N3, D3, C4, etc., R7-R10, PC3, R5, R6 and other components constitute the voltage stabilization control circuit.
Of course, the PC1 chip and peripheral components R3 and C3 on pins 1 and 2 are also part of the voltage regulator circuit.
3. Protection circuit: The PC1 chip itself and the 3-pin peripheral component R4 constitute an overcurrent protection circuit; the D2, R6, and C4 components connected in parallel on the N1 winding constitute the protection circuit of the IGBT; in essence, the voltage feedback signal of the voltage-stabilizing circuit is stable. The voltage signal can also be regarded as a voltage protection signal. However, the content of the protection circuit is not limited to the protection circuit itself, and the control of the protection circuit is often caused by the abnormality of the load circuit.
4. Load circuit: N3, N4 secondary windings and subsequent circuits are all load circuits. The abnormality of the load circuit will involve the protection circuit and the voltage stabilization circuit, so that the two circuits can make corresponding protection and adjustment actions.
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