CN203632952U - Controller for gas discharge lamp with inductive ballast - Google Patents
Controller for gas discharge lamp with inductive ballast Download PDFInfo
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- CN203632952U CN203632952U CN201320777705.5U CN201320777705U CN203632952U CN 203632952 U CN203632952 U CN 203632952U CN 201320777705 U CN201320777705 U CN 201320777705U CN 203632952 U CN203632952 U CN 203632952U
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Abstract
The utility model discloses a controller for a gas discharge lamp with an inductive ballast, and the controller comprises an energy storage device, a zero-crossing point detection circuit, a voltage comparison circuit, and a drive circuit. Two ends of the energy storage device are in parallel connection with a switching device. The controller provided by the utility model detects the alternating conversion of alternating current through the zero-crossing point detection circuit, outputs an alternating-current zero-crossing point signal, carries out repeated comparison of the alternating-current zero-crossing point signal with a dimming control signal to obtain a driving signal for driving a switch element, so as to connect or disconnect the switch element. The energy storage device carries out current-limiting adjustment for the inductive ballast of the gas discharge lamp through charging or discharging, thereby adjusting the electric energy of a load, and finally achieving the dimming and energy-saving effect. Therefore, the controller provided by the utility model can overcome a phenomenon that a conventional inductive ballast cannot adjust light independently, has no special requirements for the power supply of a power grid, can achieve linear dimming, cannot increase additional power consumption, and maintains a higher power factor.
Description
Technical field
The utility model belongs to lighting apparatus control technology field, is specifically related to a kind of controller of Inductive ballast gaseous discharge lamp.
Background technology
The gaseous discharge lamp of market sale now, comprise the light fixture for conventional outdoor lighting such as sodium vapor lamp, Metal halogen lamp, the power supply of conventional arrangement is all Inductive ballast, Inductive ballast in use, can use for a long time, failure rate is low, than electric ballast cost on also relatively low, obtained a lot of light fixture manufacturers and owner's approval.But the unique shortcoming of Inductive ballast is the control of cannot economizing on electricity, and can only guarantee to work under full power, cannot realize the effect of intelligent economize on electricity.
Now many energy-conservation companies, such as doing EMC(electromagnetic compatibility) company a lot, country is also advocating energy-saving and emission-reduction energetically, is to reduce the annual electricity charge effort in city.A lot of newly-built roads have all adopted the mode of LED light fixture, but for such street lamp, the cost of building is very high, simultaneously for traditional street lamp, the light fixture of itself installing is completely installed and is fixedly completed, cannot carry out the modification of LED light fixture, unless carry out Reconstruction of City Road, otherwise cannot on original light fixture, reequip.This has caused the control of cannot economize on electricity of light fixture on the road of urban planning originally, can only take to turn-off at times the power supply on a certain road, still does like this and can cause the illuminance greatly to reduce, and serious words there will be traffic accident,
How to allow Inductive ballast there is dimming function for this reason, make it have intelligent dimming, thereby save greatly the loss of the energy.And the solution of the intelligent tunable optical of Inductive ballast is existing several as follows at present:
(1) inductance value of adjusting Inductive ballast, by changing the size of the inductance value in circuit, the induced electromotive force producing in inductance is changed, thereby have influence on the variation of operating current, power output is changed, but this technical scheme, the inductance volume that relates to use is large, pin is many, and the quantity that changes inductance value relay used is also many, in handoff procedure, on relay, easily pull out high-voltage arc, rectifier and electricity-saving appliance are all existed to use hidden danger.
(2) adopt frequency modulation technology, frequency modulation can make the internal resistance of source increase, and also very large on the impact of electrical network, can cause the unstable of electrical network, and also higher to the performance requirement in inductor rectifier and lamp source, to a certain extent, has promoted improvement cost.
(3) Chen Jing and Piao Anlin etc. are The Fully Dimming Technology of Fluorescent Lamp with Magnetic Ballast(China Light & Lighting at title, 2011.7) in document, propose to adopt separately and exchange pm mode, power unnecessary in power supply is cut away, realize light modulation to control by the electric current of fluorescent tube; But this mode is for Inductive ballast, can make Inductive ballast in the time of work, occur that continuous energy is not enough, cause light fixture scintillation, and by detecting crossover point signal, Single-chip Controlling postpones certain hour and is connecting alternating current, and the moment that can make to connect alternating current, voltage is in high pressure conditions, do not use zero passage access, circuit is existed to impact.
Summary of the invention
For the existing above-mentioned technical problem of prior art, the utility model provides a kind of controller of Inductive ballast gaseous discharge lamp, overcome the former Inductive ballast phenomenon of light modulation separately, power supply to electrical network does not have specific (special) requirements, can realize linear tunable optical, can additionally not increase power consumption, and keep higher power factor (PF).
A controller for Inductive ballast gaseous discharge lamp, comprising:
Energy storage device, its two ends are parallel with switching device, under switching device conducting or cut-off state, by discharging and recharging, the Inductive ballast of gaseous discharge lamp are carried out to current limliting adjusting;
Zero-crossing detection circuit, is connected with energy storage device, for energy storage device both end voltage is carried out to zero passage detection, and output crossover point signal;
Voltage comparator circuit, is connected with zero-crossing detection circuit, for described crossover point signal and the dimming control signal of outside input are compared, produces zero passage start signal; And then make described zero passage start signal and dimming control signal carry out secondary comparison, to determine dimming scope the output drive signal of gaseous discharge lamp;
Drive circuit, is connected with switching device with voltage comparator circuit, for the driving signal to described isolate and power amplification after output switch control signal to control described switching device.
Preferably, described energy storage device adopts silicon steel sheet power inductance, one termination live wire, another termination Inductive ballast; The size of its inductance value, has determined the scope of a tunable optical of energy-saving induction type rectifier, can, according to customer demand, adjust inductance value, meets required dimming scope; The advantages such as it is small and exquisite that the power inductance that adopts low frequency silicon steel sheet to make has volume, and caloric value is few.
Preferably, described zero-crossing detection circuit comprises two resistance R 1～R2, two capacitor C 1～C2 and a transistor output type photoelectrical coupler U1; Wherein, one end of resistance R 1 is connected and starts to exchange fire line with one end of capacitor C 1 and one end of energy storage device, the other end of resistance R 1 is connected with the first input end of photoelectrical coupler U1, and the other end of capacitor C 1 is connected with the second input of photoelectrical coupler U1 and the other end of energy storage device; In photoelectrical coupler U1, transistorized base stage is connected with one end of capacitor C 2, and collector electrode connects supply voltage, and emitter is connected with one end of resistance R 2 with the other end of capacitor C 2 and exports described crossover point signal, the other end ground connection of resistance R 2; This circuit structure is protection controller inner member effectively, realizes high-low pressure isolation.
Described voltage comparator circuit comprises two comparator B1～B2, five resistance R 3～R7, diode D and voltage stabilizing didoe ZD; Wherein, the normal phase input end of comparator B1 is connected with one end of resistance R 5 with one end of resistance R 4, and inverting input receives described crossover point signal, and output is connected with the negative electrode of voltage stabilizing didoe ZD with one end of resistance R 3, the anode of diode D; The other end of resistance R 4 receives described dimming control signal, the other end ground connection of resistance R 5, another termination supply voltage of resistance R 3; The normal phase input end of comparator B2 is connected with the negative electrode of diode D, and inverting input is connected with one end of resistance R 7 with one end of resistance R 6, the described driving signal of output output; The other end of resistance R 6 receives described dimming control signal, and the other end of resistance R 7 is connected with the anode of voltage stabilizing didoe ZD and ground connection.
Described drive circuit comprises photoelectricity bidirectional triode thyristor driver U3 and resistance R 8; Wherein, the anode of driver U3 input side light-emitting diode connects supply voltage, and negative electrode receives described driving signal; One end of driver U3 outlet side bidirectional triode thyristor is connected with one end of resistance R 8, and the other end is connected with one end of switching device; The other end of resistance R 8 is extremely connected with the control of switching device and exports described switch controlling signal, the other end of the switching device line of starting to exchange fire.
Described dimming control signal is the voltage signal of 0～10V; Described zero-crossing detection circuit, voltage comparator circuit and drive circuit, using described dimming control signal as operating voltage, make controller realize internal passive work.
Described switching device adopts bidirectional triode thyristor.
The utility model controller can be realized by the control chip of low consumption low voltage, chip adopts the mode of passive work, be chip internal circuit supply by extract supply voltage on external dimming control signal, can meet chip internal work completely, without being the independent designing power supply circuit of control chip, reduce chip internal circuit structure, improved the reliability of control chip.
The utility model detects the exchange conversion of 220VAC/50Hz alternating current by zero-crossing detection circuit, output AC electricity crossover point signal, this signal and dimming control signal are repeatedly compared, obtain the driving signal of driving switch element, in order to conducting and the cut-off of driving switch element, switch element and main power inductance are relations in parallel, and when under switch element closure state, main power inductance is in by short-circuit condition; When under switch element cut-off state, main power inductance is in being connected into integrated circuit; In this whole process, main power inductance is adjusted the energy of storing in inductor rectifier, thereby the electric energy of regulating load is realized final dimming energy-saving effect.
Meanwhile, the utility model adopts controllable silicon as switching device, adopts technology of breaking at passing zero trigger/zero point, has reduced controllable silicon and has realized the very large harmonic wave that step-down produces, thereby reduced the impact of harmonic wave on other equipment and electrical network; Because Inductive ballast is in the process of light modulation, inner electromotive force and induced electromotive force are all in a dynamic transient equilibrium, can cause the electric current of moment to change, and therefore the utility model has redundancy with controllable silicon in the selection of transient switching electric current; Because Inductive ballast is under long-time powerful operating state, so silicon controlled heat radiation has requirement.
The utility model controller of connecting on original Inductive ballast, can overcome the former Inductive ballast phenomenon of light modulation separately, the power supply of electrical network is not had to specific (special) requirements, can realize linear tunable optical, can additionally not increase power consumption, and keep higher power factor (PF); And do not need existing lamp post structure to carry out any repacking, when realizing intelligent power saving control truly, also save cost; Without purchasing in addition supporting Inductive ballast product, save the cost of intelligent lighting upgrading.
Meanwhile, the utility model has merged PLC mechanics of communication, converts control information to user required operational motion, realizes the each function control to Inductive ballast, has realized energy-saving dimming and Based Intelligent Control truly.The use of coupled system host computer, can regularly determine the enforcement constant power light modulation of terminal, and linear power light modulation is also exchanged optical phenomenon and carried out Real-time Feedback; Merge PLC intelligent control module, can also carry out fault alarm and realtime power collection etc. to Inductive ballast.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model controller.
Fig. 2 is the structural representation of zero-crossing detection circuit.
Fig. 3 is the structural representation of voltage comparator circuit.
Fig. 4 is the structural representation of drive circuit.
Fig. 5 is the connection diagram of the utility model control chip and Inductive ballast.
Embodiment
In order more specifically to describe the utility model, below in conjunction with the drawings and the specific embodiments, the technical solution of the utility model and relative theory thereof are elaborated.
As shown in Figure 1, a kind of controller of Inductive ballast gaseous discharge lamp, comprising: power inductance, bidirectional triode thyristor Z, zero-crossing detection circuit, voltage comparator circuit and drive circuit; Wherein:
Bidirectional triode thyristor Z is parallel to power inductance two ends.
Power inductance one end line L that starts to exchange fire, another termination Inductive ballast; It carries out current limliting adjusting by discharging and recharging to the Inductive ballast of gaseous discharge lamp under bidirectional triode thyristor Z conducting or cut-off state; In present embodiment, the advantage such as power inductance adopts low frequency silicon steel sheet to make, and has volume small and exquisite, and caloric value is few; The size of its inductance value, has determined the scope of a tunable optical of energy-saving induction type rectifier, can, according to customer demand, adjust inductance value, meets required dimming scope.
Zero-crossing detection circuit is connected with power inductance, for power inductance both end voltage is carried out to zero passage detection, and output crossover point signal; As shown in Figure 2, in present embodiment, zero-crossing detection circuit comprises two resistance R 1～R2, two capacitor C 1～C2 and a transistor output type photoelectrical coupler U1; Wherein, one end of resistance R 1 is connected with one end of capacitor C 1 and one end of power inductance and starts to exchange fire line L, the other end of resistance R 1 is connected with the first input end of photoelectrical coupler U1, and the other end of capacitor C 1 is connected with the second input of photoelectrical coupler U1 and the other end of power inductance; In photoelectrical coupler U1, transistorized base stage is connected with one end of capacitor C 2, and collector electrode meets supply voltage VCC, and emitter is connected with one end of resistance R 2 and exports crossover point signal, the other end ground connection of resistance R 2 with the other end of capacitor C 2.Photoelectrical coupler U1 adopt model be the TOSHIBA of TLP630(Toshiba) transistor output type photoelectrical coupler.
Voltage comparator circuit is connected with zero-crossing detection circuit, for crossover point signal and the dimming control signal of outside input are compared, produces zero passage start signal; And then make zero passage start signal and dimming control signal carry out secondary comparison, to determine dimming scope the output drive signal of gaseous discharge lamp; As shown in Figure 3, in present embodiment, voltage comparator circuit comprises two comparator U2A and U2B, five resistance R 3～R7, diode D and voltage stabilizing didoe ZD; Wherein, the normal phase input end of comparator U2A is connected with one end of resistance R 5 with one end of resistance R 4, and inverting input receives crossover point signal, and output is connected with the negative electrode of voltage stabilizing didoe ZD with one end of resistance R 3, the anode of diode D; The other end of resistance R 4 receives dimming control signal, the other end ground connection of resistance R 5, another termination supply voltage VCC of resistance R 3; The normal phase input end of comparator U2B is connected with the negative electrode of diode D, and inverting input is connected with one end of resistance R 7 with one end of resistance R 6, output output drive signal; The other end of resistance R 6 receives dimming control signal, and the other end of resistance R 7 is connected with the anode of voltage stabilizing didoe ZD and ground connection.The voltage signal that in present embodiment, dimming control signal is 0～10V, supply voltage VCC adopts the dimming control signal of 0～10V.
Drive circuit is connected with bidirectional triode thyristor Z with voltage comparator circuit, for to drive signal isolate and power amplification after output switch control signal to control bidirectional triode thyristor Z; As shown in Figure 4, in present embodiment, drive circuit comprises photoelectricity bidirectional triode thyristor driver U3 and resistance R 8; Wherein, the anode of driver U3 input side light-emitting diode meets supply voltage VCC, and negative electrode receives and drives signal; One end of driver U3 outlet side bidirectional triode thyristor is connected with one end of resistance R 8, and the other end is connected with one end of bidirectional triode thyristor Z; The other end of resistance R 8 is extremely connected and output switch control signal with the control of bidirectional triode thyristor Z, the other end of the bidirectional triode thyristor Z line of starting to exchange fire.Driver U3 adopt model be the IL4208(prestige VISHAY of WorldCom) photoelectricity bidirectional triode thyristor driver.
Present embodiment controller can be realized by the control chip of low consumption low voltage, as shown in Figure 5; Exchange the ACIN end of live wire access control chip, (control_0-10V) control dimmer voltage is linked into (control_0-10V) input of control chip, by the variation of the control dimmer voltage of (control_0-10V), control the angle of flow of bidirectional triode thyristor.Need in the process of light modulation, change (control_0-10V) and control dimmer voltage, can change switching device in AC wave shape in corresponding angle conducting, the in the situation that of not conducting of bidirectional triode thyristor, alternating current provides energy by power inductance to Inductive ballast, power inductance has played energy storage/metering function in this period, and now the output function on Inductive ballast will be very little, and the power of entirety reduces.When bidirectional triode thyristor is in a certain amount of time after conducting, alternating current is directly powered to Inductive ballast by bidirectional triode thyristor, the power output of Inductive ballast is provided, can be slower but this changes, in the time exchanging negative half period zero crossing, bidirectional triode thyristor has again a not conducting of phase angle, power inductance carries out again the effect of energy storage/current limliting, when bidirectional triode thyristor is on specific phase angle after conducting, alternating current is directly powered to Inductive ballast by bidirectional triode thyristor, the power output of Inductive ballast is provided, improve slowly again power output, with this, Inductive ballast power output is regulated, therefore can obtain an average power output, realize Inductive ballast power adjustments.
The angle of flow of bidirectional triode thyristor is determined by the exterior control voltage of (control_0-10V), the power taking of control chip is taken from external (control_0-10V) voltage completely, control chip inside has adopted the device of the wide voltage power supply of low-power consumption, to reach passive work, the job stability of circuit and the oneself power consumption of control chip are improved.
In present embodiment, zero-crossing detection circuit detects the sense of current change procedure of alternating current under the sinusoidal wave state of 220VAV/50Hz, in this process, in the time that the sense of current changes, alternating voltage is in minimum, zero-crossing detection circuit, by detecting zero crossing output crossover point signal (zero-crossing), is opened for the zero crossing of subsequent conditioning circuit; Voltage comparator circuit gathers ac zero-crossing point signal (zero-crossing), according to the change in voltage of external dimming control signal (control_0-10V), exports different driving signals (Optocoupler_driver); Crossover point signal (zero-crossing) and dimming control signal (control_0-10V) are carried out to voltage ratio by reverse comparator, output zero passage start signal (zero-sure), zero passage start signal (zero-sure) and dimming control signal (control_0-10V) are compared by forward comparator, output combines the driving signal (Optocoupler_driver) of opening confirmation signal (zero-sure) and dimming control signal (control_0-10V) zero point again; The opening and closing of drive circuit control bidirectional triode thyristor, the driving signal (Optocoupler_driver) that this circuit is exported by voltage comparator circuit part drives optocoupler U3, optocoupler U3 output control switch control module signal (silicon_control), for making the conducting of bidirectional triode thyristor/close.
Present embodiment detects the exchange conversion of 220VAC/50Hz alternating current by zero-crossing detection circuit, output AC electricity crossover point signal, this signal and dimming control signal are repeatedly compared, obtain the driving signal of driving switch element, in order to conducting and the cut-off of driving switch element, switch element and main power inductance are relations in parallel, and when under switch element closure state, main power inductance is in by short-circuit condition; When under switch element cut-off state, main power inductance is in being connected into integrated circuit; In this whole process, main power inductance is adjusted the energy of storing in inductor rectifier, thereby the electric energy of regulating load is realized final dimming energy-saving effect.
Meanwhile, present embodiment adopts controllable silicon as switching device, adopts technology of breaking at passing zero trigger/zero point, has reduced controllable silicon and has realized the very large harmonic wave that step-down produces, thereby reduced the impact of harmonic wave on other equipment and electrical network; Because Inductive ballast is in the process of light modulation, inner electromotive force and induced electromotive force are all in a dynamic transient equilibrium, can cause the electric current of moment to change, and therefore present embodiment has redundancy with controllable silicon in the selection of transient switching electric current; Because Inductive ballast is under long-time powerful operating state, so silicon controlled heat radiation has requirement.
The present embodiment of connecting on original Inductive ballast controller, can overcome the former Inductive ballast phenomenon of light modulation separately, the power supply of electrical network is not had to specific (special) requirements, can realize linear tunable optical, can additionally not increase power consumption, and keep higher power factor (PF); And do not need existing lamp post structure to carry out any repacking, when realizing intelligent power saving control truly, also save cost; Without purchasing in addition supporting Inductive ballast product, save the cost of intelligent lighting upgrading.
Meanwhile, present embodiment has merged PLC mechanics of communication, converts control information to user required operational motion, realizes the each function control to Inductive ballast, has realized energy-saving dimming and Based Intelligent Control truly.The use of coupled system host computer, can regularly determine the enforcement constant power light modulation of terminal, and linear power light modulation is also exchanged optical phenomenon and carried out Real-time Feedback; Merge PLC intelligent control module, can also carry out fault alarm and realtime power collection etc. to Inductive ballast.
Claims (8)
1. a controller for Inductive ballast gaseous discharge lamp, is characterized in that, comprising:
Energy storage device, its two ends are parallel with switching device, under switching device conducting or cut-off state, by discharging and recharging, the Inductive ballast of gaseous discharge lamp are carried out to current limliting adjusting;
Zero-crossing detection circuit, is connected with energy storage device, for energy storage device both end voltage is carried out to zero passage detection, and output crossover point signal;
Voltage comparator circuit, is connected with zero-crossing detection circuit, for described crossover point signal and the dimming control signal of outside input are compared, produces zero passage start signal; And then make described zero passage start signal and dimming control signal carry out secondary comparison, to determine dimming scope the output drive signal of gaseous discharge lamp;
Drive circuit, is connected with switching device with voltage comparator circuit, for the driving signal to described isolate and power amplification after output switch control signal to control described switching device.
2. controller according to claim 1, is characterized in that: described zero-crossing detection circuit comprises two resistance R 1～R2, two capacitor C 1～C2 and a transistor output type photoelectrical coupler U1; Wherein, one end of resistance R 1 is connected and starts to exchange fire line with one end of capacitor C 1 and one end of energy storage device, the other end of resistance R 1 is connected with the first input end of photoelectrical coupler U1, and the other end of capacitor C 1 is connected with the second input of photoelectrical coupler U1 and the other end of energy storage device; In photoelectrical coupler U1, transistorized base stage is connected with one end of capacitor C 2, and collector electrode connects supply voltage, and emitter is connected with one end of resistance R 2 with the other end of capacitor C 2 and exports described crossover point signal, the other end ground connection of resistance R 2.
3. controller according to claim 1, is characterized in that: described voltage comparator circuit comprises two comparator B1～B2, five resistance R 3～R7, diode D and voltage stabilizing didoe ZD; Wherein, the normal phase input end of comparator B1 is connected with one end of resistance R 5 with one end of resistance R 4, and inverting input receives described crossover point signal, and output is connected with the negative electrode of voltage stabilizing didoe ZD with one end of resistance R 3, the anode of diode D; The other end of resistance R 4 receives described dimming control signal, the other end ground connection of resistance R 5, another termination supply voltage of resistance R 3; The normal phase input end of comparator B2 is connected with the negative electrode of diode D, and inverting input is connected with one end of resistance R 7 with one end of resistance R 6, the described driving signal of output output; The other end of resistance R 6 receives described dimming control signal, and the other end of resistance R 7 is connected with the anode of voltage stabilizing didoe ZD and ground connection.
4. controller according to claim 1, is characterized in that: described drive circuit comprises photoelectricity bidirectional triode thyristor driver U3 and resistance R 8; Wherein, the anode of driver U3 input side light-emitting diode connects supply voltage, and negative electrode receives described driving signal; One end of driver U3 outlet side bidirectional triode thyristor is connected with one end of resistance R 8, and the other end is connected with one end of switching device; The other end of resistance R 8 is extremely connected with the control of switching device and exports described switch controlling signal, the other end of the switching device line of starting to exchange fire.
5. controller according to claim 1 and 2, is characterized in that: described energy storage device adopts silicon steel sheet power inductance, one termination live wire, another termination Inductive ballast.
6. according to the controller described in claim 2,3 or 4, it is characterized in that: described zero-crossing detection circuit, voltage comparator circuit and drive circuit are using dimming control signal as supply voltage.
7. controller according to claim 6, is characterized in that: the voltage signal that described dimming control signal is 0～10V.
8. according to the controller described in claim 1 or 4, it is characterized in that: described switching device adopts bidirectional triode thyristor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320777705.5U CN203632952U (en) | 2013-11-29 | 2013-11-29 | Controller for gas discharge lamp with inductive ballast |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320777705.5U CN203632952U (en) | 2013-11-29 | 2013-11-29 | Controller for gas discharge lamp with inductive ballast |
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| CN203632952U true CN203632952U (en) | 2014-06-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716973A (en) * | 2013-11-29 | 2014-04-09 | 宋宏伟 | Controller of gas discharge lamp having inductive ballast |
| CN105228325A (en) * | 2015-11-10 | 2016-01-06 | 张伟萍 | Line current stepless regulator and control method thereof |
-
2013
- 2013-11-29 CN CN201320777705.5U patent/CN203632952U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716973A (en) * | 2013-11-29 | 2014-04-09 | 宋宏伟 | Controller of gas discharge lamp having inductive ballast |
| CN103716973B (en) * | 2013-11-29 | 2015-12-02 | 宋宏伟 | A kind of controller of Inductive ballast gaseous discharge lamp |
| CN105228325A (en) * | 2015-11-10 | 2016-01-06 | 张伟萍 | Line current stepless regulator and control method thereof |
| CN105228325B (en) * | 2015-11-10 | 2017-09-01 | 张伟萍 | Line current stepless regulator and its adjusting method |
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