Active power factor corrector implementation circuit based on FAN7530

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Overview:
O Introduction
The English name of PFC is called "Power Factor Correction", which means "power factor correction". PFC is a very important parameter in computer power supply. The full name is computer power factor, referred to as PFC, which is equal to "apparent power multiplied by power factor", namely: power factor = actual power / apparent power. Power factor: The power factor characterizes the ability of a computer power supply to output active power. Power is a measure of the transmission rate of energy, which is the product of voltage V and current A in a DC circuit. In an AC system, it is more complicated: some AC currents do not transmit power in the load. It is called reactive current or harmonic current, which makes the apparent power (voltage Volt multiplied by Amps) greater than the actual power. The unequal power and actual power lead to the power factor, which is equal to the ratio of the actual power to the apparent power. Only the power factor of linear loads such as electric heaters and bulbs is 1. The difference between the actual power and the apparent power of many devices is small and negligible, while the difference between capacitive devices such as computers is large. Very important. A recent study by PC Magazine in the United States showed that the typical power factor of a computer is 0.65, which means that the apparent power (VA) is 50% larger than the actual power (Watts)!

Increasing the power factor of the switching power supply not only saves energy, but also reduces harmonic pollution of the power grid and improves the power quality of the power grid. To this end, a variety of methods to improve the power factor have been developed. Among them, Active Power Factor Correction (APFC) is one of the effective methods. It is by adding a power factor correction device in series between the power grid and the power supply. The most commonly used single-phase boost pre-boost converter principle is realized by a dedicated chip, and has the advantages of high efficiency, simple circuit, low cost, etc. The low-cost voltage-type critical operation mode APFC control chip FAN7530 introduced in this paper. This is what you can do.

1 FAN7530 circuit characteristics
1.1 The internal circuit is shown in Figure 1. The FAN7530N DIP8 package also has an SMD package (FAN7530M). It contains a self-starting timer, quadrature multiplier, zero current detector, totem pole drive output, over-voltage over-current undervoltage protection, etc. Circuit.


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