CN203618201U - An electronic ballast reducing electrical network voltage waveform distortion through a bidirectional silicon controlled rectifier - Google Patents
An electronic ballast reducing electrical network voltage waveform distortion through a bidirectional silicon controlled rectifier Download PDFInfo
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- CN203618201U CN203618201U CN201320840772.7U CN201320840772U CN203618201U CN 203618201 U CN203618201 U CN 203618201U CN 201320840772 U CN201320840772 U CN 201320840772U CN 203618201 U CN203618201 U CN 203618201U
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Abstract
An electronic ballast reducing electrical network voltage waveform distortion through the bidirectional silicon controlled rectifier of the utility model comprises a rectification circuit, a filter circuit, an inversion drive circuit and an inversion circuit. The electronic ballast reducing the electrical network voltage waveform distortion through the bidirectional silicon controlled rectifier is characterized in that an input terminal of the rectification circuit is provided with an electronic switching circuit; the electronic switching circuit is always in a disconnected state when an electrical network voltage is in a process of changing towards a wave peak and a wave trough from 0V, and the electronic ballast does not obtain energy from an electrical network; and when the electrical network voltage goes beyond positions nearby the wave peak and the wave trough of the voltage, the electronic switching circuit is closed, and rectification-type electronic equipment can obtain energy from the electrical network. According to the electronic ballast of the utility model, through the controlling of disconnecting and closing moments of the electronic switching circuit, the rectification-type equipment is made to only utilize energy after the electrical network voltage goes beyond the wave peak and the wave trough, and the usage of energy in a period of the electrical network peak value and periods around the peak value is avoided, so that third-order harmonic wave and fifth-order harmonic wave components injected to the electrical network can be effectively reduced; distortion of electrical network voltage waveforms is reduced; and the electric energy quality of the electrical network is raised.
Description
Technical field
The utility model relates to a kind of electron type ballast, in particular, relates in particular to one and utilizes alternating current peak value one side energy, reduces the electron type ballast that grid voltage waveform distorts thereby reduce rectifier type electronic equipment from obtaining energy near alternating current peak value.
Background technology
Update and raising and the application of electrical type electric equipment in family and enterprises and institutions increase sharply along with the usefulness of electronic product, many electrical type electric equipments need to convert alternating current to direct current.Traditional rectification circuit is only when alternating voltage approaches peak value, and rectifying tube just conducting has input current.3 subharmonic of this pulse type input current and 5 subharmonic content are large, and operating current is larger, and the amplitude of pulse current is just larger, and the electric current of the serious distortion of waveform injects low voltage electric network, thereby brings serious harmonic pollution to electrical network.Harmonic current can increase system power dissipation, affects the normal operation of user self power consumption equipment and grid equipment, when serious, can power system accident even occur initiating system resonance.Thereby people are more and more higher to the degree of attentiveness of power grid quality, the serious consequence that harmonic current is caused is also more and more worried.International Electrotechnical Commission pays much attention to this, has formulated stricter harmonic current standard, requires the amplitude limitation of power network current harmonic wave within the limits prescribed, to guarantee the quality of electrical network.Therefore, how to transform electrical type electric equipment inhibition harmonic wave and become current important research topic.
In recent years, for energy-saving and emission-reduction, countries in the world are all advocated and are used energy-conservation lighting apparatus.Electricity-saving lamp, because of advantages such as its photoelectric efficiency are high, the life-span is long, light is soft, is generally adopted in industry and domestic lighting.The estimation of International Energy Agency mechanism, if all use electricity-saving lamp instead, global electricity needs will reduce 18%, and will greatly reduce the discharge of greenhouse gas.China in 2011 issues incandescent lamp and eliminates route, has left huge development potentiality to electricity-saving lamp, and from now on, the output of incandescent lamp and demand will greatly reduce, and electricity-saving lamp will be played protagonist.In the face of good opportunity to develop, electricity-saving lamp is also faced with other puzzlement.Because the electric current total harmonic distortion of energy-saving lamp electronic ballast can reach 100%, therefore electricity-saving lamp becomes one of main harmonic source of electrical network.In the time that these harmonic waves superpose mutually, can have a strong impact on the waveform quality of electrical network, power-supply device and power consumption equipment are caused to very large injury.
The method that suppresses at present electric ballast generation harmonic wave mainly adopts filter, but in the time that system impedance, frequency, load capacity etc. change, the filter effect of filter is had to impact.The harmonic wave of electrical type electric equipment is mainly due to the power generation that too much utilizes sinusoidal wave peak value moment, if can allow electricity-saving lamp avoid obtaining energy from line voltage peak value and near time period thereof, allow electricity-saving lamp utilize the energy of sinusoidal wave peak value one side, can greatly reduce like this harmonic amplitude, thereby effectively reduce grid voltage waveform distortion, improve the electrical network quality of power supply.Because electricity-saving lamp power is less, be relatively applicable to utilizing the energy of sinusoidal wave peak value both sides.
Summary of the invention
The utility model, in order to overcome the shortcoming of above-mentioned technical problem, provides one to utilize alternating current peak value one side energy, reduces the electron type ballast that grid voltage waveform distorts thereby reduce rectifier type electronic equipment from obtaining energy near alternating current peak value.
The electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor of the present utility model, comprise rectification circuit, filter circuit, inverse changing driving circuit and inverter circuit, the input of rectification circuit is connected with 22OV electric main, filter circuit is arranged at the output of rectification circuit, DC power supply voltage transitions is become HF switch voltage by inverter circuit, drives electricity-saving lamp luminous; Its special feature is: the input of described rectification circuit is provided with electronic switching circuit, and in the process being changed to crest and trough by 0V at line voltage, electronic switching circuit is all the time in off-state, and electron type ballast does not obtain energy from electrical network; Near line voltage exceedes superpotential crest and trough when position, electronic switching circuit closure, rectifier type electronic equipment can obtain energy from electrical network.
Rectification circuit carries out rectification to the alternating current of input, and inverter circuit is converted into HF switch voltage by DC power supply voltage under the driving of inverse changing driving circuit, drives electricity-saving lamp luminous.Only have in the time that the voltage in electrical network exceedes superpotential crest and wave trough position, electronic switching circuit is just in closed state, in all the other moment all in off-state, make rectifier type electronic equipment not utilize AC wave peak and near the energy of trough, effectively reduced the impact on grid voltage waveform distortion.
The electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor of the present utility model, described electronic switching circuit is made up of bidirectional triode thyristor VT, bidirectional diode VD, capacitor C 1, resistance R 1 and variable resistor R2, and bidirectional triode thyristor VT is series on the incoming line of 220V electric main; Resistance R 1, variable resistor R2 and capacitor C 1 connect successively after the two ends of the circuit that forms, be connected to respectively in two main electrodes of bidirectional triode thyristor VT; One end of bidirectional diode VD is connected with the gate pole of VT, and the other end is connected to the junction of variable resistor R2 and capacitor C 1.
Bidirectional triode thyristor is series on an incoming line of 220V electric main, by controlling conducting and the cut-off of bidirectional triode thyristor, and then whether controls civil power to rectification circuit input energy.Bidirectional diode VD is connected on the gate pole of bidirectional triode thyristor VT, 220V electric main charges to capacitor C 1 through resistance R 1, variable resistor R2 and rectification circuit, through charging after a while, in the time that the voltage at capacitor C 1 two ends reaches the conducting voltage of bidirectional diode VD, the gate pole of bidirectional triode thyristor VT and main electrode obtain a trigger impulse, VT conducting, electrical network just can be powered by rectification circuit to the back-end, do not reach the conducting voltage of VD of diode at the voltage at capacitor C 1 two ends before, electrical network is circuit supply to the back-end not.Therefore, by regulating the resistance in variable resistor R2 place in circuit, can change the charging interval of the C1 to electric capacity, if while having served as the crest of AC sinusoidal voltage of electrical network and trough, bidirectional triode thyristor VT just can conducting, just makes whole circuit avoid utilizing sine voltage peak value and near energy thereof, but utilize the energy of crest, trough rear end, thereby the component of 3 subharmonic and 5 subharmonic, has also just reduced the distortion of grid voltage waveform in minimizing electrical network, improve the electrical network quality of power supply.
The electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor of the present utility model, the cycle of establishing electric main is T, the conducting voltage of bidirectional diode VD is
; The access resistance of resistance R 1, variable resistor R2, the size of capacitor C 1 should meet: capacitor C 1 starts charging until reach in the input voltage zero crossing moment
time period used is greater than T/4.
The electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor of the present utility model, comprises the resonant circuit being made up of transformer TB1 and capacitor C 8; Described inverse changing driving circuit is made up of fixed frequency pulse width modulated chip TL494, inverter circuit is made up of field effect transistor VT1 and VT2, the grid of VT1, VT2 is connected with 9 pins, 10 pins of TL494 respectively, the source electrode of VT1 is connected with the source electrode of VT2 with R14 by resistance R 13, the drain electrode of VT1, VT2 is connected to respectively the two ends of transformer TB1 first side winding, and the junction of R13 and R14, the centre tap of transformer TB1 are connected to respectively two outputs of rectification circuit.
The electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor of the present utility model, described rectification circuit is the full bridge rectifier being made up of diode VD1, VD2, VD3, VD4, filter circuit is made up of capacitor C 2; Two ends of capacitor C 2 are connected on two outputs of rectification circuit.
The beneficial effects of the utility model are: electron type ballast of the present utility model, by arranging by bidirectional triode thyristor VT on the incoming line of line voltage, bidirectional diode VD, resistance R 1, the electronic switching circuit that variable resistor R2 and capacitor C 1 form, change the charging interval of line voltage to capacitor C 1 by the resistance that changes resistance R 2, when exceeding the crest of electrical network sinusoidal voltage, when trough, just control bidirectional triode thyristor VT conducting, make so whole circuit only utilize line voltage crest, the energy of trough rear end, avoid utilizing line voltage peak value and the energy near the time period thereof, thereby can effectively reduce in electrical network and inject 3 subharmonic and 5 order harmonic components, also just reduced the distortion of grid voltage waveform, improve the electrical network quality of power supply.
Electron type ballast of the present utility model, reduce the impact on grid voltage waveform distortion, under the present situation of being particularly used widely in family and commercial department at electrical type electric equipment, the utility model provides new method for improving grid voltage waveform, has reduced impact and the harm of harmonic wave on electric power system and power consumption equipment.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that reduces the electron type ballast of grid voltage waveform distortion by bidirectional triode thyristor of the present utility model;
Fig. 2 is electrical network input voltage waveform, input to the voltage waveform of rectification circuit, the schematic diagram of the voltage waveform of rectification circuit output.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
As shown in Figure 1, what provided utility model reduces the circuit diagram of the electron type ballast of grid voltage waveform distortion by bidirectional triode thyristor, it is made up of electronic switching circuit, rectification circuit, filter circuit, inverse changing driving circuit, inverter circuit and resonant circuit, electronic switching circuit is arranged at 220V alternating current to the input of rectification circuit, for the ON time that arrives of control circuit.Rectification circuit is the full bridge rectifier being made up of rectifier diode VD1, VD2, VD3, VD4, and filter circuit is made up of capacitor C 2, and two ends of capacitor C 2 are connected on two outputs of rectification circuit, and the voltage of output is carried out to filtering.Inverter circuit is made up of field effect transistor VT1 and VT2, and it not only allows to be passed through by larger electric current, but also can carry out high frequency shutoff and conducting; The front end of inverter circuit is the inverse changing driving circuit of fixed frequency pulse width modulated chip LT494 composition, to produce the PWM waveform of the two-way complementation that drives inverter circuit work.Resonant circuit is made up of transformer TB1 and capacitor C 8, for power saving fluorescent lamps LAMP provides the electric current of normal work.
Shown electronic switching circuit is made up of bidirectional triode thyristor VT, bidirectional diode VD, resistance R 1, variable resistor R2 and capacitor C 1, shown bidirectional triode thyristor VT is connected to 220V alternating voltage to the circuit of inverter circuit, by controlling conducting and the cut-off of bidirectional triode thyristor VT, whether alternating current is inputed to rectification circuit and control.Resistance R 1, variable resistor R2 and capacitor C 1 connect successively after the two ends of the circuit that forms, be connected to respectively in two main electrodes of bidirectional triode thyristor VT, one end of bidirectional diode VD is connected with the gate pole of bidirectional triode thyristor VT, and the other end is connected to the junction of variable resistor R2 and capacitor C 1; Like this, the sinusoidal ac of electrical network input charges to capacitor C 1 by R1, R2 and rectification circuit, in the time that the voltage at capacitor charging C1 two ends reaches the positive and negative conducting voltage threshold value of bidirectional diode VD, just can trigger bidirectional triode thyristor VT two-way admittance, in the time of electric network source voltage zero-cross, bidirectional triode thyristor VT disconnects automatically.Therefore, by changing the resistance size in variable resistor R2 place in circuit, the charging interval of control capacitance C1, can control the ON time of VT, to line voltage, when place in circuit is controlled.
If establishing the cycle of line voltage and be the cycle of T(standard civil power point is 0.02s), the conducting voltage of establishing bidirectional diode VD is
, when voltage zero-crossing point of power grid, capacitor C 1 to be charged, the time period that process is greater than T/4 just can be charged to the voltage at capacitor C 1 two ends
size, just can make bidirectional triode thyristor VT conducting, as shown in Figure 2, provide the schematic diagram of the voltage waveform V3 of electrical network input voltage waveform V1, the voltage waveform V2 that inputs to rectification circuit, rectification circuit output, like this, just make whole circuit only utilize the energy of crest and trough rear end, and the energy of unfavorable crest, trough and near zone thereof with electrical network, thereby can effectively reduce in electrical network and inject 3 subharmonic and 5 order harmonic components, also just reduce the distortion of grid voltage waveform, improved the electrical network quality of power supply.Meanwhile, can, according to the size of electricity-saving lamp power, change the resistance size of variable resistor R2, adjust the break-make moment of electronic switching circuit, reach the object of reasonable distribution power.
Inverter control circuit is made up of TL494 chip, the pin 1 of TL494 chip is connected to respectively by resistance R 3, R4 on two outputs of rectification circuit, pin 2 is connected with pin 3 with capacitor C 5 by resistance R 6 successively, pin 4 is connected with power supply negative terminal with capacitor C 3 by resistance R 5, and pin 4,5 passes through respectively capacitor C 6, resistance R 7 pin 8 that is connected with power-and is just connected with power supply.When TL494 chip in inverse changing driving circuit is started working, inner 12 pin voltage stabilizing circuits are started working, and are internal circuit power supply, and R4, C5 introduce high frequency negative feedback, anti-High-frequency Interference; Pin 1 is feedback sample element, for adjusting output voltage; R3, R6 provide bias voltage for pin 4, for controlling Dead Time; R7, C4 provide benchmark for pin 2 internal comparator; 5, the external resistance of 6 pins and electric capacity and internal circuit form oscillator jointly, to determine that oscillator produces the frequency of square-wave signal.
Inverter circuit is made up of field effect transistor VT1 and VT2, the PWM square-wave signal of pin 9,10 output two-way complementations drives VT1 and VT2 conducting in turn, DC power supply voltage transitions is become to HF switch voltage, C6, LAMP and TB1 form resonant circuit, C6 two ends produce high voltage, driving electricity-saving lamp is luminous, and when after the normal work of electricity-saving lamp, C6 and TB1 provide the voltage and current of the normal work of electricity-saving lamp under alternating voltage.
As shown in Figure 2, provide the schematic diagram of the voltage waveform of electrical network input voltage waveform, the voltage waveform that inputs to rectification circuit, rectification circuit output, in figure A, label is that 1 waveform is the oscillogram of electrical network input voltage, as 2 being the charging curve of capacitor C 1, curve 1 is crossing at the crest of input voltage waveform or the rear side of trough with curve 2, and the magnitude of voltage of its joining is the conducting voltage of bidirectional diode VD
like this, under the effect of bidirectional triode thyristor VT, input to voltage oscillogram in full bridge rectifier as shown in figure B, make whole circuit utilize only the energy of crest and trough rear side, and avoided using crest and trough and near power grid energy thereof, effectively reduce and inject 3 subharmonic and 5 order harmonic components in electrical network, also just reduce the distortion of grid voltage waveform, improved the electrical network quality of power supply.After the rectification of rectification circuit, its output voltage waveforms is as shown in figure C.
Claims (5)
1. one kind reduces the electron type ballast of grid voltage waveform distortion by bidirectional triode thyristor, comprise rectification circuit, filter circuit, inverse changing driving circuit and inverter circuit, the input of rectification circuit is connected with 22OV electric main, filter circuit is arranged at the output of rectification circuit, DC power supply voltage transitions is become HF switch voltage by inverter circuit, drives electricity-saving lamp luminous; It is characterized in that: the input of described rectification circuit is provided with electronic switching circuit, in the process being changed to crest and trough by 0V at line voltage, electronic switching circuit is all the time in off-state, and electron type ballast does not obtain energy from electrical network; Near line voltage exceedes superpotential crest and trough when position, electronic switching circuit closure, rectifier type electronic equipment can obtain energy from electrical network.
2. the electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor according to claim 1, it is characterized in that: described electronic switching circuit is made up of bidirectional triode thyristor VT, bidirectional diode VD, capacitor C 1, resistance R 1 and variable resistor R2, bidirectional triode thyristor VT is series on the incoming line of 220V electric main; Resistance R 1, variable resistor R2 and capacitor C 1 connect successively after the two ends of the circuit that forms, be connected to respectively in two main electrodes of bidirectional triode thyristor VT; One end of bidirectional diode VD is connected with the gate pole of VT, and the other end is connected to the junction of variable resistor R2 and capacitor C 1.
3. the electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor according to claim 1 and 2, is characterized in that: the cycle of establishing electric main is T, and the conducting voltage of bidirectional diode VD is
; The access resistance of resistance R 1, variable resistor R2, the size of capacitor C 1 should meet: capacitor C 1 starts charging until reach in the input voltage zero crossing moment
time period used is greater than T/4.
4. the electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor according to claim 1 and 2, is characterized in that: comprise the resonant circuit being made up of transformer TB1 and capacitor C 8; Described inverse changing driving circuit is made up of fixed frequency pulse width modulated chip TL494, inverter circuit is made up of field effect transistor VT1 and VT2, the grid of VT1, VT2 is connected with 9 pins, 10 pins of TL494 respectively, the source electrode of VT1 is connected with the source electrode of VT2 with R14 by resistance R 13, the drain electrode of VT1, VT2 is connected to respectively the two ends of transformer TB1 first side winding, and the junction of R13 and R14, the centre tap of transformer TB1 are connected to respectively two outputs of rectification circuit.
5. the electron type ballast that reduces grid voltage waveform distortion by bidirectional triode thyristor according to claim 1 and 2, it is characterized in that: described rectification circuit is the full bridge rectifier being made up of diode VD1, VD2, VD3, VD4, and filter circuit is made up of capacitor C 2; Two ends of capacitor C 2 are connected on two outputs of rectification circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320840772.7U CN203618201U (en) | 2013-12-19 | 2013-12-19 | An electronic ballast reducing electrical network voltage waveform distortion through a bidirectional silicon controlled rectifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320840772.7U CN203618201U (en) | 2013-12-19 | 2013-12-19 | An electronic ballast reducing electrical network voltage waveform distortion through a bidirectional silicon controlled rectifier |
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| CN203618201U true CN203618201U (en) | 2014-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320840772.7U Withdrawn - After Issue CN203618201U (en) | 2013-12-19 | 2013-12-19 | An electronic ballast reducing electrical network voltage waveform distortion through a bidirectional silicon controlled rectifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103619113A (en) * | 2013-12-19 | 2014-03-05 | 山东建筑大学 | Electronic-type ballast for reducing power grid voltage waveform distortion by bidirectional controllable silicon |
| CN104808032A (en) * | 2015-04-13 | 2015-07-29 | 苏州泰思特电子科技有限公司 | Device for removing current wave distortion in AC magnetic field under start and stop |
-
2013
- 2013-12-19 CN CN201320840772.7U patent/CN203618201U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103619113A (en) * | 2013-12-19 | 2014-03-05 | 山东建筑大学 | Electronic-type ballast for reducing power grid voltage waveform distortion by bidirectional controllable silicon |
| CN103619113B (en) * | 2013-12-19 | 2016-09-07 | 山东建筑大学 | The electrical ballast of grid voltage waveform distortion is reduced by bidirectional triode thyristor |
| CN104808032A (en) * | 2015-04-13 | 2015-07-29 | 苏州泰思特电子科技有限公司 | Device for removing current wave distortion in AC magnetic field under start and stop |
| CN104808032B (en) * | 2015-04-13 | 2018-02-02 | 苏州泰思特电子科技有限公司 | The device that current wave distorts in AC magnetic field when starting stopping for eliminating |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140528 Effective date of abandoning: 20160907 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |