NCP1650芯片演示：100W PFC转换器的广泛特性与保护功能

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标题："PFC电路1212121" 提供了一篇关于高性能100瓦功率因数校正（PFC）转换器的详细介绍。该转换器基于ON Semiconductor的NCP1650芯片设计，旨在实现宽范围的特性，尤其在千瓦级别以下的控制能力。PFC电路的主要目的是提高电力设备的效率，通过改善输入电源的功率因数，减少电网的谐波干扰。描述中提到，这款转换器具备固定频率操作，无论是连续模式还是断续模式下都能稳定工作。它还集成了多种保护功能，包括瞬时电流限制、平均电流限制以及真正的功率限制，确保系统的安全性和稳定性。这些特性使得该电路能够适应广泛的输入电压范围，从85Vrms到265Vrms，以及50Hz到60Hz的频率变化。电路设计中特别强调了其固定频率控制，这意味着输出不会随着电网频率的变化而波动，提高了系统响应的精确性。此外，内置的关断电路确保了转换器在不需运行时的节能状态。为了简化集成，该PFC转换器包含了一个高电压启动电路，以及一个自供电的偏置电路，它可以从主的Boost电感器获取能量，进一步节省了外部元件的需求。值得注意的是，该转换器还配备了多种保护机制，能够在各种异常情况下自动调整或关闭，确保系统免受过载或短路等故障的影响。同时，其内置的真正功率限制功能能有效防止长时间的过度功率消耗，从而保护整个电路系统和连接的负载。总结来说，这款1212121号PFC电路是针对广泛应用场合设计的，它集成了高性能、高效率、多保护和易于集成的优势，是现代电子设备中提升能源利用效率的理想选择。

 Semiconductor Components Industries, LLC, 2003

February, 2003 - Rev. 2

1 Publication Order Number:

AND8106/D

100 Watt, Universal Input,

PFC Converter

ON Semiconductor

General Description

This 100 watt converter demonstrates the wide range of

features found on the NCP1650. This chip is capable of

controlling PFC converters well into the kilowatt range.

In addition to excellent power factor, this chip offers fixed

frequency operation in continuous and discontinuous modes

of operation. It has a wide variety of protection features,

including instantaneous current limiting, average current

limiting, and true power limiting.

This unit will provide 400 V of well regulated power from

an input source with a frequency range from 50 Hz to 60 Hz,

and a voltage range of 85

rms

to 265

rms

. It is fully self

contained and includes a high voltage start-up circuit, and

bias supply that operates off of the boost inductor.

Features

• Fixed Frequency Operation

• Shutdown Circuit

• Operation Over the Universal Input Range

• Multiple Protection Schemes

• True Power Limiting

• Start-Up and Bias Circuits Included

Circuit Description

Start-Up Circuit

The start-up circuit allows the unit to use power from the

input line to begin operation, and then shuts down to allow

operation off of the bias winding, which reduces losses in the

circuit.

The start-up circuit has three modes of operation. One is

used for starting the NCP1650 when the chip is functional,

one is for bias power during shutdown operation, and the

third is the off state.

When power is initially applied to the unit, the gate of the

pass transistor will be high, and the FET will be fully

enhanced. The current into the V

capacitance at pin 1 will

be limited by the three 10 k resistors in series with the FET.

Figure 1. Start-Up Circuit Schematic

FQP1N60

10 k 10 k 10 k

out

1.2 M

MMSZ5248BT1

1 F

bias

NCP1650

This circuit will provide current as long as the FET is

enhanced. For this to occur, the gate to source voltage must

be greater than the gate threshold voltage. For this device

that value is nominally, 4.0 V. The zener breakdown voltage

is 18 V, so the FET will turn off at:

Vchg

max

 18 V  4.0 V  14 Volts

As the output capacitor is charged up during the turn-on

sequence, the bias supply voltage will also increase until the

source of the FET exceeds 14 V. At this point, the FET will

cease conduction, and all of the V

power will be supplied

via the bias circuit from the power inductor.

If the unit is commanded into the shutdown mode, the chip

will reduce its bias current to 0.5 mA and the start-up circuit

will then maintain a regulated voltage of approximately

14 V on the V

pin until the device becomes operational.

APPLICATION NOTE

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