CN1980021A - Harmonic-wave inhibiting device of dc. load power-chanaging regulation - Google Patents

Abstract

The harmonic suppression device includes single chip, zero cross detection circuit for single-phase AC, power control module (PCM), speed adjustment circuit, and DC electrical source. Interrupt signal end INT0 of single chip is connected to the output end of the zero cross detection circuit. Interrupt signal end INT1 of single chip is connected to the output end of the speed adjustment circuit. Data output port P0 of single chip is connected to the input control end of PCM. The output end of PCM is connected to load motor. Wave of asymmetric unfilled corner full wave rectification is composed of two pieces of half-wave alpha, and beta in one cycle. Alpha, and beta half-wave have same polarity, but different angle of flow. The invention carries out asymmetric control for angles of flow of alpha, beta in PCM to reach purpose of restraining third harmonic. Features are: no large vibration from road motor, speed adjustment in 64 steps, and obvious restraining effect on low speed.

Description

A kind of DC load becomes the harmonic suppression apparatus of power adjustments

Technical field

The present invention relates to the power controller of dust catcher and electric tool technical field, especially a kind of DC load becomes the harmonic suppression apparatus of power adjustments.

Background technology

Understand according to the applicant, when adopting advanced international standard that existing dust catcher and electric tool are detected, exceed standard problem, particularly power of ubiquity triple-frequency harmonics surpasses dust catcher and the electric tool of 1200W.

Retrieval is found, in order to suppress harmonic wave, U.S. Pat 5955794 has proposed a kind of load output control circuit that is connected in AC power, this circuit contains the output-controlling device that oriented load provides alternating voltage, this output-controlling device comprises the phase-control circuit according to the required load power consumption preset reference angle of flow, be connected to the control circuit of phase-control circuit, thereby this control circuit can in the corresponding increase in the default angle of flow reference value left and right sides or reduce to change the all-wave angle of flow, to reduce the Harmonic Voltage amount that causes owing to output-controlling device.

In addition, application number is the output control device that 01217163.8 Chinese patent discloses a kind of dust catcher, comprises every half cycle starting point testing circuit, interrupt signal generation circuit, the bidirectional triode thyristor circuit of single-chip microprocessor MCU 1, single-phase alternating current.It is introduced, because the every half cycle starting point testing circuit by single-phase alternating current can detect every half-wave starting point of alternating current and import single-chip microcomputer, therefore single-chip microcomputer can be controlled the output of its mouthful line and makes silicon symmetrical switch avoid 80 to spend to the angle of flow of 130 these scopes of degree, then the triple-frequency harmonics of Chan Shenging is very little, influence to electrical network is little, and the power that also can control motor changes from small to large.

Yet above prior art does not all solve the problem that suppresses harmonic wave from the DC characteristic angle of interlock circuit, to DC load and inapplicable.Above-mentioned United States Patent (USP) technical costs height; Domestic patented technology can cause that load motor has bigger vibrations, and has only eight grades of speed governing, interferes big during low speed.

Summary of the invention

The technical problem to be solved in the present invention is: at the shortcoming that above prior art exists, propose a kind of harmonic suppression apparatus that the interlock circuit DC characteristic effectively suppresses the DC load change power adjustments of triple-frequency harmonics that makes full use of.

The present invention realizes the technical scheme that above-mentioned purpose adopts.This DC load of the present invention becomes the harmonic suppression apparatus of power adjustments, mainly comprises single-chip microprocessor MCU, is used for the α of power control module and the angle of flow of β are carried out asymmetrical control; The zero cross detection circuit of single-phase alternating current is used to detect every half-wave zero crossing of alternating current and detection signal is imported single-chip microprocessor MCU; Power control module is used to produce asymmetric unfilled corner full-wave rectification ripple, the control load motor; Alignment circuit is used to obtain speed-regulating signal and imports single-chip microprocessor MCU; DC power supply is used for powering to entire circuit.The output of the zero cross detection circuit of the interrupt signal end INT0 order cross streams electricity of single-chip microprocessor MCU, the interrupt signal end INT1 of single-chip microprocessor MCU connects the output of alignment circuit, the input control end G of the data output P0 termination power control module of single-chip microprocessor MCU, the output termination load motor of power control module.Asymmetric unfilled corner full-wave rectification ripple is made up of two half-wave α, β waveform in 1 cycle, and the angle of flow of the same polarity of α, β and α and β is unequal, and promptly pulsewidth is unequal.

Alignment circuit of the present invention is formed the potentiometer alignment circuit by RW, C4.

DC power supply of the present invention is made up of R1, R2, D1, DW1, C2, C3.

The zero cross detection circuit of single-phase alternating current of the present invention is made up of R3, R4.

Power control module of the present invention is by bidirectional triode thyristor VT1, diode D2, D3, D4, D5 form, the one-way communication electricity carries out the control of the angle of flow to the control end G of bidirectional triode thyristor VT1 by single-chip microprocessor MCU through bidirectional triode thyristor VT1, the full bridge rectifier of forming via D2, D3, D4, D5 produces the asymmetric unfilled corner full-wave rectification ripple that is used for the control load motor then.

Power control module of the present invention is by one-way SCR VT2, VT3, diode D6, D7, D8 form, the one-way communication electricity carries out the control of the angle of flow to the control end G of VT2, VT3 by single-chip microprocessor MCU through VT2, VT3, the half control full bridge rectifier of forming via VT2, VT3, D6, D7, D8 produces the asymmetric unfilled corner full-wave rectification ripple that is used for the control load motor then

The effect that the present invention is useful: two half-wave α, β of same polarity, under the unequal situation of the angle of flow of α and β, the effect that can effectively suppress 3 subharmonic by the α of power control module and the angle of flow of β are carried out asymmetrical control, reaches the purpose that suppresses 3 subharmonic.Compare with domestic patented technology, load motor does not have bigger vibrations, can realize 64 grades speed governing, and it is obvious to suppress effect during low speed; Compare the cost performance height with the patented technology of the U.S..

Description of drawings

The present invention is further illustrated below in conjunction with accompanying drawing.

Fig. 1 is a schematic block circuit diagram of the present invention;

Fig. 2 is circuit theory diagrams of the present invention;

Fig. 3 is the unfolding circuits figure of the power output control circuit module of embodiment 1;

Fig. 4 is the unfolding circuits figure of the power output control circuit module of embodiment 2;

Fig. 5 is the oscillogram of asymmetric unfilled corner full-wave rectification ripple;

Fig. 6 is the waveform exploded view one of asymmetric unfilled corner full-wave rectification ripple;

Fig. 7 is the waveform exploded view two of asymmetric unfilled corner full-wave rectification ripple;

Fig. 8 is the polar plot under the angle of flow same case of α and β;

Fig. 9 is the polar plot under the angle of flow of α and the β situation inequality.

Embodiment:

Below in conjunction with drawings and Examples the present invention is further described, embodiment will help to understand the present invention better, but the present invention is not limited only to following embodiment.

Embodiment 1:

The harmonic suppression apparatus of the DC load change power adjustments of present embodiment as shown in Figure 1 and Figure 2, this DC load becomes the harmonic suppression apparatus of power adjustments, mainly comprise single-chip microprocessor MCU, be used for the angle of flow of power control module AP-01 α and β is carried out asymmetrical control; The zero cross detection circuit of single-phase alternating current is made up of R3, R4, is used to detect every half-wave zero crossing of alternating current and detection signal is imported single-chip microprocessor MCU; Power control module is used to produce asymmetric unfilled corner full-wave rectification ripple, and control meets the load motor M of dust catcher or electric tool; Alignment circuit is formed the potentiometer alignment circuit by RW, C4, is used to obtain speed-regulating signal and imports single-chip microprocessor MCU; DC power supply is made up of R1, R2, D1, DW1, C2, C3, is used for powering to entire circuit.The output of the zero cross detection circuit of the interrupt signal end INT0 order cross streams electricity of single-chip microprocessor MCU, the interrupt signal end INT1 of single-chip microprocessor MCU connects the output of alignment circuit, the input control end G of the data output P0 termination power control module AP-01 of single-chip microprocessor MCU, the output termination load motor M of power control module AP-01.Asymmetric unfilled corner full-wave rectification ripple is made up of two half-wave α, β waveform in 1 cycle, and the angle of flow of the same polarity of α, β and α and β is unequal, and promptly pulsewidth is unequal.

The power control module of present embodiment as shown in Figure 3, power control module is by bidirectional triode thyristor VT1, diode D2, D3, D4, D5 form, the one-way communication electricity carries out the control of the angle of flow to the control end G of VT1 by MCU through VT1, the full bridge rectifier of forming via D2, D3, D4, D5 then, produce asymmetric unfilled corner full-wave rectification ripple, the load motor M of control dust catcher or electric tool.

Operation principle:

One, waveform name: asymmetric unfilled corner full-wave rectification ripple.

Two, waveform explanation: (as shown in Figure 5)

1, waveform is made up of two half-wave α, β in 1 cycle, and the angle of flow of α and β is unequal, and promptly pulsewidth is unequal.

2, two waveforms are same polarity.

Three, DC load becomes the principle of the harmonic wave inhibition scheme of power adjustments:

1, Fig. 5 can equivalence becomes the stack of Fig. 6, Fig. 7, and Fig. 5 action effect is equivalent to the stack that Fig. 6, Fig. 7 act on respectively.

2, the effect Fourier expansion of Fig. 6:

$f_{\left(\mathrm{\ωt}\right)}=A_0+\underset{K=1}{\overset{\∞}{\mathrm{\Σ}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\ωt}}+{\mathrm{\ψ}}_k)$

Ψ _kWith α linear correlation, Ψ _kBe equivalent to α.

The effect Fourier expansion of Fig. 7:

${f^{,}}_{\left(\mathrm{\ωt}\right)}=A_0+\underset{K=1}{\overset{\∞}{\mathrm{\Σ}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\ωt}}+{\mathrm{\ψ}}_k)$

Ψ _kWith β linear correlation, Ψ _kBe equivalent to β.

If being α, α=π+β equates with the angle of flow of β, then:

$=A_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&alpha;})+{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="A20061015450900101.png"\; state="\{\{state\}\}">A</figure-callout>}}_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&beta;})$

$=A_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&pi;}+\mathrm{\&beta;})+{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="A20061015450900101.png"\; state="\{\{state\}\}">A</figure-callout>}}_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&beta;})$

$=2(A_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&beta;}))$

$=2f_{\left(\mathrm{\&omega;t}\right)}^{,}$

For any fundamental harmonic wave component be absolute value and, polar plot is as shown in Figure 8.

If: α=π+β+Δ Ψ _kThe angle of flow that is α and β is unequal, then:

$=A_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&alpha;})+{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="A20061015450900101.png"\; state="\{\{state\}\}">A</figure-callout>}}_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&beta;})$

$=A_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&pi;}+\mathrm{\&beta;}+\mathrm{\&Delta;}{\mathrm{\&psi;}}_k)+{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="A20061015450900101.png"\; state="\{\{state\}\}">A</figure-callout>}}_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&beta;})$

$=A_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&beta;}+\mathrm{\&Delta;}{\mathrm{\&psi;}}_k)+{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="A20061015450900101.png"\; state="\{\{state\}\}">A</figure-callout>}}_0+\underset{K=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{A}_{\mathrm{km}}\mathrm{Sin}(K_{\mathrm{\&omega;t}}+\mathrm{\&beta;})$

Polar plot as shown in Figure 9.

By Fig. 8 and Fig. 9 as can be known:

F ' _{Always (ω t)}＜f _{(ω t)}+ f ' _{(ω t)}

That is: f ' _{Always (ω t)}＜f _{Always (ω t)}

So the fundamental harmonic wave component is littler than fundamental harmonic wave component when α equates with the β angle of flow when α is unequal with the β angle of flow, just 3 subharmonic effectively suppress within the specific limits.

Embodiment 2:

The basic comprising of present embodiment is identical with embodiment 1, different is power control module as shown in Figure 4, power control module is by one-way SCR VT2, VT3, diode D6, D7, D8 form, the one-way communication electricity carries out the control of the angle of flow to the control end G of VT2, VT3 by MCU through VT2, VT3, the half control full bridge rectifier of forming via VT2, VT3, D6, D7, D8 produces asymmetric unfilled corner full-wave rectification ripple then, the load motor M of control dust catcher or electric tool.

In addition to the implementation, the present invention can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of requirement of the present invention.

Claims (6)

1. a DC load becomes the harmonic suppression apparatus of power adjustments, it is characterized in that:

1.1), this device mainly comprises single-chip microprocessor MCU, be used for the angle of flow of power control module α and β is carried out asymmetrical control; The zero cross detection circuit of single-phase alternating current is used to detect every half-wave zero crossing of alternating current and detection signal is imported single-chip microprocessor MCU; Power control module is used to produce asymmetric unfilled corner full-wave rectification ripple, the control load motor; Alignment circuit is used to obtain speed-regulating signal and imports single-chip microprocessor MCU; DC power supply is used for powering to entire circuit;

1.2), the output of the zero cross detection circuit of the interrupt signal end INT0 order cross streams electricity of single-chip microprocessor MCU, the interrupt signal end INT1 of single-chip microprocessor MCU connects the output of alignment circuit, the input control end G of the data output P0 termination power control module of single-chip microprocessor MCU, the output termination load motor of power control module;

1.3), asymmetric unfilled corner full-wave rectification ripple is made up of two half-wave α, β waveform in 1 cycle, the angle of flow of the same polarity of α, β and α and β is unequal, promptly pulsewidth is unequal.

2. become the harmonic suppression apparatus of power adjustments according to the described DC load of claim 1, it is characterized in that: described alignment circuit is formed the potentiometer alignment circuit by RW, C4.

3. become the harmonic suppression apparatus of power adjustments according to the described DC load of claim 1, it is characterized in that: described DC power supply is made up of R1, R2, D1, DW1, C2, C3.

4. become the harmonic suppression apparatus of power adjustments according to the described DC load of claim 1, it is characterized in that: the zero cross detection circuit of described single-phase alternating current is made up of R3, R4.

5. become the harmonic suppression apparatus of power adjustments according to the described DC load of claim 1, it is characterized in that: described power control module is by bidirectional triode thyristor VT1, diode D2, D3, D4, D5 form, the one-way communication electricity carries out the control of the angle of flow to the control end G of bidirectional triode thyristor VT1 by single-chip microprocessor MCU through bidirectional triode thyristor VT1, the full bridge rectifier of forming via D2, D3, D4, D5 produces the asymmetric unfilled corner full-wave rectification ripple that is used for the control load motor then.

6. become the harmonic suppression apparatus of power adjustments according to the described DC load of claim 1, it is characterized in that: described power control module is by one-way SCR VT2, VT3, diode D6, D7, D8 form, the one-way communication electricity carries out the control of the angle of flow to the control end G of VT2, VT3 by single-chip microprocessor MCU through VT2, VT3, the half control full bridge rectifier of forming via VT2, VT3, D6, D7, D8 produces the asymmetric unfilled corner full-wave rectification ripple that is used for the control load motor then.

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