Switching power supply 5v switching power supply Shenzhen switching power supply 12v switching power supply 24v switching power supply
First, the flyback switching power supply classification
The topology of the switching power supply is classified according to the power level as follows:
Commonly used RSC (self-oscillation) topology within 10W
Frequently used flyback topology within 10W-100W (the PF value is required for power supplies above 75W)
100W-300W forward, double tube flyback, quasi-resonant
300W-500W quasi-resonant, double-tube forward, half-bridge, etc.
500W-2000W double tube forward, half bridge, full bridge
2000W or more full bridge
Second, the focus of the flyback switching power supply
In the switching power supply market, power supplies below 400W account for about 70-80% of the market, and flyback power supplies account for the majority. The most common consumer products are flyback power supplies.
Advantages: low cost, few external components, low energy consumption, suitable for wide voltage range input, multi-group output.
Disadvantages: The output ripple is relatively large. (Output plus low internal resistance filter capacitor or LC noise filter can be improved)
Today, the design flow of the most commonly used flyback switching power supply and the selection method of components are taken as an example. Explain to you how to read the circuit diagram of the flyback switching power supply!
Third, the flyback switching power supply circuit diagram analysis In general, the total points are divided according to the initial and secondary side of the transformer. The circuit of the switching power supply includes the following main components, as shown in Figure 1.
First understand the safety components of the power supply - the fuse is shown in Figure 3.
Function: Safety protection. In case of abnormal power supply, the core device is protected from damage.
Technical parameters: rated voltage, rated current, and blown time.
Category: Quick break, slow break, regular
Calculation formula: where: Po: output power
η efficiency: (designed evaluation value)
Vinmin: minimum input voltage
2: For the empirical value, in practical applications, the value range of the fuse is 1.5 to 3 times the theoretical value.
0.98: PF value
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