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PFC (power factor correction) circuit based on delta-sigma modulation technique and duty ratio control method thereof

A modulation technology and modulation circuit technology, applied in the direction of electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the core duty cycle control algorithm without any innovation, no good suppression and other problems, to achieve improved The effects of stabilizing the output voltage, improving the response speed, and improving the power factor

Inactive Publication Date: 2011-11-23
佛山市南海赛威科技技术有限公司
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  • Claims
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Problems solved by technology

This does not maximize the advantages of digital control, there is no innovation in the core duty cycle control algorithm, and the electromagnetic interference (Electro-Magnetic Interference, EMI) generated by the switching power supply itself is not well suppressed.

Method used

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  • PFC (power factor correction) circuit based on delta-sigma modulation technique and duty ratio control method thereof
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  • PFC (power factor correction) circuit based on delta-sigma modulation technique and duty ratio control method thereof

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Embodiment Construction

[0044] based on the following Figure 3 to Figure 10 The preferred embodiment of the present invention is described in detail:

[0045] Such as image 3 A PFC circuit based on delta-sigma modulation technology is shown, the PFC circuit includes an input voltage analog-to-digital converter (ADC) 101, a duty cycle generation circuit, an output voltage processing circuit and a digital pulse width modulation circuit 108 connected in a circuit .

[0046] The duty cycle generation circuit includes a switching frequency control circuit 106 , a Ton calculation circuit 105 and a delta-sigma modulation circuit 107 connected in circuit.

[0047] The output voltage processing circuit includes an output voltage analog-to-digital converter (ADC) 102 , a digital PI compensator 103 and a fast dynamic response circuit 104 connected in a circuit.

[0048] The input voltage analog-to-digital converter (ADC) 101 samples the input voltage Vg(t), converts it into a digital signal, and outputs it...

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Abstract

The invention provides a PFC (power factor correction) circuit based on a delta-sigma modulation technique and a duty ratio control method thereof. The PFC circuit comprises an input voltage ADC (analog to digital converter), a duty ratio generation circuit, an output voltage processing circuit and a digital pulse width modulation circuit in electrical connection, wherein the duty ratio generation circuit comprises a switching frequency control circuit, a Ton counting circuit and a delta-sigma modulation circuit in electrical connection; and the output voltage processing circuit comprises an output voltage ADC, a digital PI (proportional integral) compensator and a rapid dynamic response circuit in electrical connection. The delta-sigma modulation technique is utilized in the PFC circuit to realize the duty ratio control method. According to the invention, the response speed of the input voltage change can be improved, the iL waveform of the input inductive current is adjusted, the frequency spectrum of the pulse width signal is shaped, the power factor is improved and the output voltage is stabilized.

Description

technical field [0001] The invention relates to a PFC (power factor correction) circuit based on delta-sigma modulation technology and a duty ratio control method thereof. Background technique [0002] In a typical switching power supply application system, the input AC power is converted into DC power after full-wave rectification. Although the input power supply can be approximated as a smooth sine wave, due to the wide application of uncontrolled rectifiers (traditional rectification circuits composed of rectification diodes without control functions) in power equipment, the input current will appear discontinuous and severely distorted, which A large number of harmonic currents will be generated. All kinds of harmonics cause great pollution to the power grid, which greatly reduces the efficiency of production, transmission and utilization of electric energy. Therefore, for the AC / DC converter at the forefront of the power system, its efficiency and energy-saving charac...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCY02B70/126Y02B70/10
Inventor 职春星钱阔
Owner 佛山市南海赛威科技技术有限公司
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