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Frequency control system and method applied to power factor corrector

A technology of power factor correction and frequency control, applied in the frequency control field of frequency control system and power factor corrector, can solve the problems of reducing system power factor, etc. Effect

Active Publication Date: 2014-09-10
佛山市南海赛威科技技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] As we all know, the deviation between the actual frequency of the TM PFC system and the theoretically calculated frequency will lead to an increase in the total harmonic distortion (THD, Total Harmonic Distortion) of the system, thereby reducing the power factor (PF value) of the system, so a new technology is urgently needed to overcome this defect

Method used

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  • Frequency control system and method applied to power factor corrector
  • Frequency control system and method applied to power factor corrector
  • Frequency control system and method applied to power factor corrector

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Embodiment 1

[0072] see Figure 10 , the present invention discloses a frequency control system applied to a power factor corrector, said system comprising: a zero current detector ZCD (zero current detector) 40, an analog multiplier 20, an error amplifier EA (Error amplifier) ​​10, a current Detection comparator 30, frequency corrector 50.

[0073] The output end of the error amplifier 10 is connected to an input end of the analog multiplier 20, the output end of the analog multiplier 20 is connected to an input end of the current detection comparator 30, and the output end of the current detection comparator 30 is connected to the frequency corrector 50. One input terminal, the output terminal of the zero current detector 40 is connected to one input terminal of the frequency corrector 50 .

[0074] The zero current detector 40 is used to detect the boost inductor of the power factor corrector PFC ( Figure 6 In L1), when the boost inductor current drops to zero, a new switching cycle ...

Embodiment 2

[0088] see Figure 13 The difference between this embodiment and Embodiment 1 is that in this embodiment, the frequency corrector includes an RS flip-flop 53 , an adjustable timer 51 , and a logical OR gate 52 . The adjustable timer 51 receives the MULT voltage and a reset signal, and the reset signal comes from the output PFC power tube control signal. The output signal of the adjustable timer 51 is connected to one input terminal of the logical OR gate 52 , and the output signal of the zero current detector 40 is connected to the other input terminal of the logical OR gate 52 . The output signal of the logical OR gate 52 is connected to an input terminal of the RS flip-flop 53 , and the output signal of the current detection comparator 30 is connected to an input terminal of the RS flip-flop 53 .

[0089] see Figure 14 , the adjustable timer 51 includes a constant current source I1, a first capacitor C1, a reset switch S1 and its control input signal, a comparator with hy...

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Abstract

The invention discloses a frequency control system and method applied to a power factor corrector. The frequency control system comprises a zero current detector, an analog multiplier, an error amplifier, a current detector comparer and a frequency corrector, wherein the output end of the error amplifier is connected with one input end of the analog multiplier, the output end of the analog multiplier is connected with one input end of the current detection comparer, the output end of the current detection comparer is connected with one input end of the frequency corrector, and the output end of the zero current detector is connected with one input end of the frequency corrector. According to the frequency control system and method applied to the power factor corrector, through monitoring an AC input voltage in real time, the switching frequency of the system is compensated or corrected, therefore the purposes of reducing total harmonic distortion (THD) and increasing power factor (PF) value are achieved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and relates to a frequency control system, in particular to a frequency control system applied to a power factor corrector; meanwhile, the invention also relates to a frequency control method applied to a power factor corrector. Background technique [0002] Various power electronic devices represented by switching power supplies have brought great promotion and progress to our industrial production and social life. However, the harmonic interference of the power supply and the pollution of the power grid have long been raised. . However, the number of previous power supplies was small, and their harmonic interference was relatively small, so they did not attract widespread attention. In the past 30 years, with the great development of modern economy and technology, more and more electrical equipment has been added to the power grid, generating a large number of harmonic components a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 叶俊林官秋李茂职春星
Owner 佛山市南海赛威科技技术有限公司
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