Switching power supply PFC (Power Factor Correction) control system and PWM (Pulse Width Modulation) signal generating method thereof
A correction control, switching power supply technology, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc. powerful effect
Inactive Publication Date: 2017-05-10
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a switching power supply PFC correction control system and its PWM signal generation method, which solves the problem of slow processing speed of the above-mentioned single-chip microcomputer and DSP, and can improve the power factor more accurately, making its control more flexible
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Embodiment 1
[0021] Example 1, such as Figure 1-4 As shown, a switching power supply PFC correction control system includes: EMI filter module 1, which reduces the pollution of the switching power supply to the power grid; rectification module 2, which converts alternating current into direct current; The Boost boost topology is selected for calibration; the current and voltage sampling module 4 collects signals of the input current, input voltage and output voltage through the A / D converter; the protection module 5 protects the switching power supply from damage caused by uncertain factors such as temperature The control module 6 uses FPGA high-speed parallel processing to generate PWM signals; the drive module 7 drives the switching device MOSFET in the Boost boost module through the drive module, so that the input current phase follows the input voltage phase, thereby improving the switching power supply. Power factor, reduce input side harmonics.
[0022] The input terminal of the EM...
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The invention relates to a switching power supply PFC (Power Factor Correction) control system and a PWM (Pulse Width Modulation) signal generating method thereof, and belongs to the technical field of power factor correction. The system comprises an EMI (Electro-Magnetic Interference) filter module, a rectifier module, a Boost module, a current and voltage sampling module, a protection module, a control module and a drive module, wherein the EMI filter module is used for reducing pollution of a switching power supply to a grid; the rectifier module is used for converting alternating current into direct current; the Boost module is used for selecting Boost topology for PFC of the switching power supply; the current and voltage sampling module is used for acquiring signals of input current, input voltage and output voltage via an A / D converter; the protection module is used for protecting damage of uncertain factors such as temperature to the switching power supply; the control module is used for generating a PWM signal by using FPGA (Field Programmable Gate Array) high-speed parallel processing; and PWM wave passes through the drive module to drive a switching device MOSFET (Metal Oxide -Semiconductor Field Effect Transistor) in the Boost module. By adopting the system and the method, the PFC precision of the switching power supply is improved and the switching power supply is more flexible to control.
Description
technical field [0001] The invention relates to a switching power supply PFC correction control system and a PWM signal generation method thereof, belonging to the technical field of power factor correction. Background technique [0002] With the rapid development of power electronic technology, more and more power electronic devices are used in various fields, and in modern electronic products, power supply devices are indispensable. Switching power supplies are widely used due to their small size, low power consumption, wide range of voltage regulation, and high efficiency. However, the energy of the switching power supply comes from the grid and is connected to it through a rectifier. The rectifier device often contains a capacitive filter bridge structure composed of diodes or thyristors and other nonlinear elements and capacitors, which causes the input impedance of the switching power supply to be resistive and capacitive. Therefore, even if the waveform of the input ...
Claims
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IPC IPC(8): H02M1/42
CPCH02M1/4208Y02B70/10
Inventor 陈颀王丹
Owner KUNMING UNIV OF SCI & TECH