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Harmonic distortion compensation circuit, related circuit, system and method

A harmonic distortion and compensation circuit technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as the inability to compensate harmonic distortion, and achieve the effect of improving stability and reducing THD

Pending Publication Date: 2021-11-12
MAXIC TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

present, using the switch on-time T on The method of superimposing the input voltage waveform cannot compensate the harmonic distortion caused by the change of the circuit conduction mode

Method used

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  • Harmonic distortion compensation circuit, related circuit, system and method
  • Harmonic distortion compensation circuit, related circuit, system and method
  • Harmonic distortion compensation circuit, related circuit, system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0081] In the specific implementation manner of the technical solution of the above-mentioned embodiment 1, Figure 7 In the time sampling circuit shown, when the first capacitor C1 is discharged, the output time signal V cap is a voltage signal, in order to facilitate subsequent signal processing, refer to Figure 11 As shown, the harmonic distortion compensation circuit 50 of the switching power supply system in Embodiment 2 of the present invention also includes a signal conversion circuit 54 arranged between the time sampling circuit 52 and the time adjustment circuit 53, and the signal conversion circuit 54 is configured to sample the time The voltage signal output by the circuit 52 is converted into a current signal, and the current signal is input into the time adjustment circuit 53 for signal calculation and processing.

[0082] In a specific example, refer to Figure 12 As shown, the signal conversion circuit 54 includes a current sampling switch SH, a third capacit...

Embodiment 3

[0086] Based on the same inventive concept, an embodiment of the present invention also provides a load driving circuit, including the feedback detection circuit 30 , the pulse width modulator 40 , the driver U0 and the harmonic distortion compensation circuit 50 described in the first or second embodiment above. ;

[0087] The pulse width modulator 40 is connected to the feedback detection circuit 30 and the driver U0 respectively.

[0088] In a specific embodiment, the feedback detection circuit 30 samples the sampling voltage V representing the output current cs , according to the sampling voltage V cs get the comparison voltage V comp , and output to the pulse width modulator 40;

[0089] The pulse width modulator 40 receives the comparison voltage V comp and the conduction time control signal SD of the harmonic distortion compensation circuit 50, the output is used to adjust the conduction time T on drive signal;

[0090] Driver U0 adjusts the on-time T according to...

Embodiment 4

[0095] Based on the same inventive concept, an embodiment of the present invention also provides a harmonic distortion compensation method, including:

[0096] Detect the demagnetization state of the inductor during the switching cycle, and output the end signal of the inductor demagnetization at the end of the inductor demagnetization;

[0097] Sampling the output signal of the pulse width modulator and according to the received inductance demagnetization end signal, obtain the time signal representing the switch conduction time, the inductance demagnetization time and the switch start waiting time;

[0098] According to the time signal representing the switch conduction time, the inductor demagnetization time and the switch startup waiting time, the conduction time control signal is determined to control the switch conduction time of the switching power supply system.

[0099] In a specific embodiment, the conduction time control signal is determined according to the time si...

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Abstract

The invention discloses a harmonic distortion compensation circuit, a related circuit, a system and a method, and the harmonic distortion compensation circuit comprises a demagnetization state detection circuit, a time sampling circuit and a time adjusting circuit. The demagnetization state detection circuit is used for detecting the demagnetization state of an inductor in the switching period and outputting an inductor demagnetization ending signal to the time sampling circuit at the inductor demagnetization ending moment; the time sampling circuit is used for sampling an output signal of a pulse width modulator, obtaining time signals representing switch conduction time, inductor demagnetization time and switch starting waiting time according to the received inductor demagnetization ending signal, and outputting the time signals to the time adjusting circuit; and the time adjusting circuit is used for determining a turn-on time control signal according to the time signal and outputting the turn-on time control signal to the pulse width modulator so as to control the switch turn-on time of a switching power supply system. The THD of the circuit is reduced, and the stability of supplying power to a controlled load by the switching power supply system is improved.

Description

technical field [0001] The invention relates to a harmonic distortion compensation circuit, a related circuit, a system and a method. Background technique [0002] In the prior art, due to the unavoidable oscillation of the circuit or the second harmonic generated by other resonances, the third harmonic and the noise test harmonic are superimposed on the actual input signal, the output signal at the output terminal is not simply the same as the input signal The components, but the signals that include harmonic components, the comparison between these extra harmonic components and the actual input signal, expressed as a percentage, is called Total Harmonic Distortion (THD). [0003] When the input voltage is in the trough interval, the peak current of the inductor decreases with the input voltage, causing the demagnetization time T of the inductor dmg Due to the limitation of the frequency of the switching tube, for example, the frequency of the general switching tube is bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M1/08
CPCH02M1/12H02M1/08Y02B70/10
Inventor 赵汗青
Owner MAXIC TECHNOLOGY CORPORATION