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A filter circuit and method for AC ripple signal

An AC ripple and circuit technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of EMI radiation, poor filtering effect, etc., to achieve the effect of filtering interference

Inactive Publication Date: 2011-12-14
SHENZHEN JINGQUANHUA ELECTRONICS
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a filter circuit and method for AC ripple signals, aiming to solve the existing technology of filtering AC power frequency signals in the output of DC power supply, some of which have poor filtering effect; The problem of high frequency EMI radiation

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  • A filter circuit and method for AC ripple signal
  • A filter circuit and method for AC ripple signal
  • A filter circuit and method for AC ripple signal

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0025] see figure 1 , the filtering circuit of the AC ripple signal provided by the present invention includes a synchronous rectification circuit, a microcontroller, a drive module, a current sensor, a first voltage sensor and a second voltage sensor, and the first voltage sensor is connected to the input of the synchronous rectification circuit end, the input terminal voltage is collected and sent to the microcontroller; the drive module is connected to the microcontroller, and the control signal of the microcontroller is transmitted to the synchronous rectification circuit; the current sensor and the second voltage sensor are connected to the output of the synchronous rectification circuit On the terminal, the voltage and current coll...

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Abstract

The invention discloses a filter circuit and method for AC ripple signals. The method includes step S1: initializing a microcontroller; step S2: setting interrupt control, starting to collect output signals within the interrupt waiting time, and Perform AD conversion on the output signal of the output signal; step S3: monitor whether the AD conversion is over, otherwise end and continue to step S2, if yes, execute step S4; step S4: calculate the error value between the voltage to be controlled and the actual output voltage according to the output signal obtained by sampling; Step S5: Adjust the error value by proportional integral to obtain the switching time of the FET; Step S6: The microcontroller controls the duty cycle of the output PWM signal according to the obtained time, and the driving module controls the FET according to the PWM signal on and off. The invention can effectively filter out the interference of the AC power frequency signal without generating high-frequency EMI radiation.

Description

technical field [0001] The invention relates to the field of audio signals, in particular to an AC ripple signal filtering circuit and method. Background technique [0002] The output of single-stage power factor correction AC / DC conversion DC power supply or low-frequency DC power supply often superimposes a power-frequency AC signal, which will generate low-frequency humming AC noise in audio and other applications. The usual solution is to One or several high-capacity electrolytic capacitors are added to the DC output end. The electrolytic capacitors are not only large in size, but also have limited ability to filter out power frequency AC signals and cannot achieve effective constant voltage control. Another solution is to achieve a smooth DC output by adding a DC / DC chip, thereby filtering out the AC power frequency signal, but this solution will generate high-frequency EMI radiation due to the introduction of a high-frequency switching signal. question. [0003] Ther...

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Application Information

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IPC IPC(8): H02M1/12
Inventor 张立品鞠万金汪兆华李战功刘建飞谢春华
Owner SHENZHEN JINGQUANHUA ELECTRONICS
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