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A pfc circuit with variable output voltage

A technology of output voltage and input voltage, which is applied in the field of AC-DC converters, can solve the problems of large magnetic core size, reduced power supply reliability, and low efficiency, so as to improve efficiency, improve application range and reliability, and reduce inductance volume. small effect

Active Publication Date: 2020-03-17
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when realizing wide voltage range input, especially when the input voltage is at a low voltage (such as 85VAC), the magnetic core of the existing technical solution is large in size and low in efficiency, which reduces the overall reliability of the power supply and also affects the service life of the power supply.

Method used

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  • A pfc circuit with variable output voltage
  • A pfc circuit with variable output voltage
  • A pfc circuit with variable output voltage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 2 Shown is the circuit diagram of Embodiment 1 of the present invention.

[0032] The input end of the rectification network 101 is connected to the AC input; the positive output end of the rectification network 101 is connected to one end of the input capacitor C1 and the primary end of the transformer T1 with the same name (the end with the black punctuation is the end with the same name, and the end without the black punctuation is the end with the same name). name end) connection; the output negative end of the rectification network 101 is connected with the other end of the input capacitor C1 and the output GND; the primary end of the same name of the transformer T1 is connected with the anode of the diode D1 and the drain of the switching tube TR1; the cathode of the diode D1 is connected with the output One end of capacitor C2, output positive terminal V OConnection; the source of the switch tube TR1 is connected to the CS pin of the control chip IC...

Embodiment 2

[0050] Figure 4 It is the second embodiment of the present invention, and the main difference with the first embodiment is that the transistor in the input voltage comparison network 107 is replaced by a MOS tube, which is beneficial to reduce the temperature effect on the current I Q3 effect, improve the stability of the output voltage.

[0051] One end of the resistor R8 in the input voltage comparison network 107 is connected to the positive output terminal of the rectifier network 101; the other end of the resistor R8 is connected to one end of the resistor R9 and one end of the capacitor C4; the other end of the resistor R9 is connected to one end of the capacitor C5 and the resistor R10 One end of the resistor R11 is connected to the gate of the N-MOS transistor Q1; the other end of the capacitor C4 is connected to the other end of the capacitor C5, the other end of the resistor R10, the source of the N-MOS transistor Q1, and the output GND; N - the drain of the MOS tr...

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Abstract

The invention provides a PFC circuit with a variable output voltage. The PFC circuit comprises a rectifying network 101, a BOOST converter 102, an output voltage sampling network 106, a control IC andan input voltage comparison network 107. The output voltage of the BOOST converter of the invention is a variable output voltage. The alternating current input voltage is detected through the input voltage comparison network 107, and when the input voltage is relatively low, the output voltage of the BOOST converter is VO1, and when the input voltage is relatively high, the output voltage of theBOOST converter is VO2.

Description

technical field [0001] The invention relates to the field of switching converters, in particular to AC-DC converters for active power factor correction. Background technique [0002] With the rapid development of modern industry, the nonlinear load of power system is increasing day by day. The harmonic current generated by these non-linear loads is injected into the power grid, which distorts the voltage waveform of the public power grid, seriously pollutes the environment of the power grid, and threatens the safe operation of various electrical equipment in the power grid. In order to eliminate or minimize the many harms of grid harmonics, it is usually required to limit the harmonics generated by equipment, so there is a limit requirement for power factor. At present, there are power factor requirements for switching power supplies with power consumption greater than 75W, that is, the operating current waveform of the circuit is basically the same as the voltage waveform....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M1/42
CPCH02M1/4258H02M7/217Y02B70/10
Inventor 何垒刘湘
Owner MORNSUN GUANGZHOU SCI & TECH