CN1022453C - Light-adjusting lighting device for high-low pressure gas discharge lamp - Google Patents
Light-adjusting lighting device for high-low pressure gas discharge lamp Download PDFInfo
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- CN1022453C CN1022453C CN 90105763 CN90105763A CN1022453C CN 1022453 C CN1022453 C CN 1022453C CN 90105763 CN90105763 CN 90105763 CN 90105763 A CN90105763 A CN 90105763A CN 1022453 C CN1022453 C CN 1022453C
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- 229910052708 sodium Inorganic materials 0.000 abstract description 7
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 abstract description 5
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Abstract
A lighting and dimming device for gas discharge lamps is used for lighting and dimming high and low pressure sodium lamps, mercury lamps and metal halide lamps. The PCM type DC/AC power converter composed of CMOS digital integrated circuit and VMOS device is mainly equipped with high-frequency ballast and automatic high-voltage trigger controlled by lamp tube current. The problems that the traditional gas discharge lamp lighting device is narrow in working voltage range, low in efficiency, poor in power factor and incapable of dimming are solved. The gas discharge lamp can normally work in the voltage range of 150-240V, and the lamp can be adjusted by hand or computer, so that the gas discharge lamp becomes an adjustable lamp. The application range of the gas discharge lamp is widened, the power factor is improved, and the efficiency is improved (the electricity is saved by about 10%).
Description
High-low pressure Dimming for Discharge Lamps ignition device of the present invention relates to a kind of electronic technology, is applicable to gaseous discharge lamps such as mercury lamp, sodium vapor lamp, metal halide lamp are carried out the device that light modulation is lit a lamp.
At present, all gases discharge lamp has advantages such as light output is big, luminance is high, the life-span is long, is a kind of desirable energy-conservation new light sources, has obtained in the world using widely.Figure one has listed the light of several frequently seen gaseous discharge lamp, the curve that electrical quantity changes with the supply voltage effective value.Wherein (a) is that mercury lamp, (b) are metal halide lamp for sodium vapor lamp, (c), (d).Ue is that supply voltage effective value, U are that light tube electric voltage, I are that lamp current, P are that power of lamp tube, F are that luminous flux, H are that fluorescent tube light efficiency, Tc are colour temperature.Analyze these curves, can find that the output light flux of these gaseous discharge lamps all significantly changes with the variation of electric lake voltage (effective value), its luminous efficiency but changes not quite.As if can carry out light modulation to gaseous discharge lamp with the mode that changes supply voltage.
Yet the gaseous discharge lamp that is operated under the alternating voltage will extinguish when the every half cycle of supply voltage finishes, and catches fire again after lower half begins.Again catching fire needs certain voltage magnitude, if supply voltage descends significantly, and the difficulty that will become of catching fire again, even can not catch fire again and cause lamp to extinguish.Supply voltage when fluorescent tube extinguishes is called extinction voltage.Extinction voltage is all relevant with factors such as lamp type, operating voltage, ignition device and service positions, and the extinction voltage of gaseous discharge lamp is generally in the 80-90% of supply voltage scope when using the various traditional ignition device that is made of resistance, inductance, electric capacity or leakage transformer.In actual the use, the supply voltage of energy steady operation is also narrower than above-mentioned scope, thus use traditional ignition device not come gaseous discharge lamp is carried out light modulation with the change voltage magnitude, otherwise, lamp is extinguished.So, use the gaseous discharge lamp of traditional ignition device to exist weakness such as the photocontrol characteristic is poor, scintillation index height, for this reason people it list in can not light modulation light source, limited its range of application greatly.
The objective of the invention is application electric technology and design a kind of high-low pressure Dimming for Discharge Lamps ignition device, this light dimming device can be under the condition of lighting a lamp that keeps the fluorescent tube steady operation, adopted time ratio control principle, the apply pulse width modulation mode, under the condition that does not change the lamp works voltage magnitude, utilize the way that changes lamp works voltage and operating current effective value to reach the control luminous flux, carry out the purpose that light modulation is lit a lamp.
The operation principle of high-low pressure Dimming for Discharge Lamps ignition device of the present invention is:
1. design principle: this device output voltage waveforms is symmetric double polarity square pulse (figure two), and the relation of its lamp works voltage effective value Ea and amplitude Um, period T s and pulsewidth τ can be represented by the formula:
Ea＝2τ/TsUm
By figure two, Um is constant for the sustaining voltage amplitude, adjusts the size of τ value, changes duty of ratio, the i.e. size of scalable lamp works voltage Ea.
If fluorescent tube extinction voltage amplitude is U
0, voltage magnitude Um is one greater than U
0Appropriate value, and make it when regulating the τ value in a big way, to remain unchanged substantially, fluorescent tube kept steady operation and unlikely extinguishing when Ea was changed in a big way.
At time τ
0In, voltage magnitude is zero, the meeting of gaseous discharge lamp is extinguished, and catches fire again when next half cycle begins then.If τ
0Oversize, also can causing to catch fire again extinguishes lamp.For different gaseous discharge lamps, allow τ
0Maximum in the 5-15mS scope.According to figure two, utilize time ratio control principle for this reason, adopt higher operating frequency (about 20KHz), carry out pulse width modulation, make lamp current at τ
0In continuous substantially, enlarged the adjustable range of τ.
2. high-low pressure Dimming for Discharge Lamps ignition device circuit structure block diagram of the present invention is made of the rectifier filter among the figure three, DC/AC power converter, current detecting ring, high frequency ballast, gaseous discharge lamp, light/electric isolator, clock oscillator, V/W modulator, phase-splitting driver, over-current protecting unit, filtering high-frequency rectifier device, high-voltage trigger, triggering controller etc.
By 220V, 50Hz power frequency supply through diode D
10～D
13Current rectifying and wave filtering circuit is converted to DC power supply, DC/AC power converter Q
4, Q
5At phase drive circuit Q
1, Q
2Control under, convert thereof into the high frequency electric source that wave mode is the square type (the about 20KHz of frequency), this high frequency electric source is through current detecting ring L
3, L
4After, by constant low-loss high frequency ballast L
5Provide stable frequency modulation electric current to gaseous discharge lamp.
By light/electric isolator IC
2The clock oscillation and the V/W(voltage/pulsewidth that constitute with digital integrated circuit) modulator is the control core of this device, 0～20mA current signal of sending here with electronic computer or other controller is a benchmark, by the effective value of drive circuit control DC/AC power converter output current.When control signal equals 0mA, minimum current value of being adjusted of corresponding output according to different gaseous discharge lamps, when control signal equals 20mA, lowest high-current value of being adjusted of then corresponding output according to different gaseous discharge lamps.The current detecting ring detects the working current value of fluorescent tube; when the operating current of fluorescent tube greater than according to the lowest high-current value of being adjusted of different gaseous discharge lamps the time; current foldback circuit is started working, and the restriction electric current no longer continues to increase, the not reason overcurrent of protective gas discharge lamp and damaging.
High-voltage triggering circuit (SCR, C
13, L
5, L
6) be used to not have the startup of the gaseous discharge lamp of ignitor, when circuit begins to connect, not not igniting of gaseous discharge lamp, the current detecting ring is output as zero, trigger control circuit makes the high-voltage pulse of the about 0.5S of high-voltage triggering circuit output gap, the about 6000V of amplitude, the about 2 μ s of pulsewidth, gaseous discharge lamp is triggered ignite.After lamp ignited, the output of current detecting ring was greater than zero, and trigger control circuit is turn-offed high-voltage triggering circuit.When outage or after other reason extinguishes lamp, trigger control circuit makes the high-voltage triggering circuit automatic time delay trigger the unlikely frequent starting of protective gas discharge lamp after 2-15 minute again.
In addition, this device also is provided with main fuse, power supply indicator and prevents to produce the power supply radio noise filter of radio interference noise.
Light dimming device circuit diagram five of the present invention specifies:
1. the pulse width modulation control circuit of the band light of being made up of the COMS digital integrated circuit/electricity isolation is the core of this device.In order to simplify circuit, to improve reliability, all circuit is by IC
2～IC
5Four integrated circuits are formed, wherein IC
2Be light/electric coupling, IC
3Be multifunctional trigger CD4047, its inside has comprised a clock (CP) oscillator, two-divider and output circuit.Exportable one road CP signal and two road 1/2 anti-phase each other frequency CP signals.
1,2,3 pin of CD4047 are external timing circuit ends of CP oscillator, and the height of CP frequency is by R
6, C
7Decision.13 pin output CP signal, 10,11 pin are exported two road 1/2 anti-phase each other frequency CP signals.
IC
4Timer NE555 forms relatively type V/W modulator of reference voltage-triangular wave, by IC
3The duty ratio sent here of 13 pin be that 1: 1 square type CP pulse is through R
5, C
9After the integrating circuit of forming is converted to triangular wave, enter IC
4 Control voltage end 5 pin and IC
4The control voltage of high-triggering end 6 pin compares modulation.
Here establish IC
4The voltage of 5,6,3 pin be respectively U
5, U
6, U
3The V/W modulated process can be illustrated by figure four: the triangle wave voltage U with constant frequency and amplitude
5In voltage comparator with reference voltage U
6Compare.When every triangular wave is higher than reference voltage, output voltage U
3Being high level, on the contrary, then is low level.Like this, adjust U
6Value, work as U
6During rising, the output pulse narrowing; Work as U
6During reduction, the output pulse then broadens.At last, by the frequency square pulse identical after the modulation of 3 pin output pulse widths with CP.
Two doors of IC2-four NAND gate CD4011 are modulated as phase-splitting, and two other door connects and is inverter, do output and isolate.
2. manual control/computer control signal is by input port K
1, K
2Send into light/electric coupling IC
21,2 pin, from the corresponding with it electric current of an isolation of 5 pin output, this electric current is through R
2At IC
46 pin on produce a voltage signal, output pulse width is modulated.
3. half-bridge (or full-bridge) the high-frequency high-power DC/AC change-over circuit of forming with novel high-power VMOS device is the pass chain of this device.Because gaseous discharge lamp is high-power negative resistance load, trigger voltage height, impulse current are greatly when having startup, working produces the characteristics of current spike often, therefore very high to the requirement of change-over circuit.In order to adapt to these characteristics, adopted have the electric current negative temperature characteristic, no secondary-breakdown phenomenon, VMOS high-frequency high-power semiconductor device that switching loss is little formed switching mode DC/AC change-over circuit.For different lamps, the form of change-over circuit is different.For high-pressure sodium lamp, its operating voltage generally is lower than 100V, and circuit is connected into half-bridge.For high-pressure mercury lamp and metal halide lamp, its operating voltage generally is higher than 100V, and circuit then is connected into full-bridge, in figure five by Q
4, Q
5Form half-bridge.Like this, output voltage and lamp works voltage phase difference are less, and high frequency ballast L loss is reduced.Q in the circuit
4, Q
5Be the IRF352 type VMOS pipe that Mo Tuoluola company produces, capacitor C
16, C
17, C
18Effect be to absorb the high-voltage pulse that circuits for triggering produce.
By transistor Q
1, Q
2The driver of forming is with IC
5The two-phase pulse of sending here amplifies, through transformer TR
2, TR
3Isolation, voltage-stabiliser tube DW
1, DW
2Send into Q behind the amplitude limit
4, Q
5Grid.
4. by the non-attended light tube current restricting circuits of pulse width modulation control.Be to detect from Q by current detecting ring L
4, Q
5The high-frequency electrical flow valuve of output is through D
8, D
9Be sent to the V/W modulator after the rectification, to IC
4The pulsewidth of 6 pin output control, when the high-frequency electrical flow valuve of output surpasses W
3During set point, D
6Conducting is risen the control voltage of V/W modulation circuit, and output pulse width narrows down, and the output voltage effective value descends, and output current is limited near the setting value.
5. the high frequency ballast that has chokes and high pressure triggering function.As the choke L of high frequency ballast and trigger winding L on same pair of iron core.When fluorescent tube started, bidirectional thyristor SCR was triggered, and mains rectified voltage is passed through R
12At C
13On be filled with the voltage of about 300V, by SCR to L
6Discharge makes L
5On the high-voltage pulse that induces up to 6000V fluorescent tube is punctured, this moment L
5Play trigger.After fluorescent tube started, SCR no longer was triggered, L
5Play restriction, level and smooth lamp current, constitute high frequency ballast.
6. automatic triggering and the time-delay by lamp current control triggers controller again.Be provided with current detecting ring L in the circuit
4Before fluorescent tube started, lamp current was zero, L
4There is not the output of the electric current of detection, transistor Q
3Turn-off diac D
14Make bidirectional thyristor SCR triggering and conducting, gaseous discharge lamp is started.After fluorescent tube started, lamp current was greater than zero, L
4The output of the electric current of detection is arranged, transistor Q
3Conducting makes diac D
14Short circuit, SCR no longer is triggered, and trigger quits work.
After fluorescent tube extinguishes, though L does not have the output of the electric current of detection,, capacitor C
15The electricity that is filled during fluorescent tube is lighted will be through R
15, R
14And Q
3The discharge of base stage-emitter-base bandgap grading loop, make Q
3Keep conducting, the retention time is by R
15, C
15The time constant decision.At Q
3During the maintenance, trigger quits work.Usually, in the side circuit, be fixation of C the cooling time of gaseous discharge lamp between 2-15 minute
15Value, again according to determining R the cooling time of employed gaseous discharge lamp regulation
15Value.
High-low pressure gaseous discharge lamp light dimming device circuit working process of the present invention is:
1. trigger the process of lighting a lamp
220V 50Hz power frequency supply is by AC
1, AC
2Termination is gone into, through overcurrent fuse F
1And L
1, L
2, C
1, C
2Behind the RF filter of forming, be divided into two-way.One the tunnel through power transformer TR
1Step-down is after auxilliary power circuit transfers the 9V DC power supply to, as this machine working power.Another road is through D
10, D
11, D
12, D
13And C
11, C
12After the current rectifying and wave filtering circuit of forming is converted to the DC power supply of about 300V, by Q
4, Q
5The wave mode that the DC/AC power converter of forming is converted to the about 300V of Um is the high frequency electric source (the about 20KHz of frequency) of square type.And through current detecting ring L
3, L
4And high frequency ballast L
5Provide high-frequency current to gaseous discharge lamp.
Gaseous discharge lamp does not ignite when circuit begins to connect, and lamp current is zero, current detecting ring L
4No current output, transistor Q
3Turn-off, diac makes bidirectional thyristor SCR triggering and conducting, and DC power supply is through R
12Fill at C
13On the voltage of about 300V, by SCR to L
6Discharge makes L
5On induce fluorescent tube to be punctured and start up to the high-voltage pulse of 6000V.After fluorescent tube started, lamp current was greater than zero, L
4The output of the electric current of detection is arranged, transistor Q
3Conducting makes diac and capacitor C
14Short circuit, SCR no longer is triggered, and trigger quits work.Fluorescent tube is by high frequency ballast L
5Operate as normal under the stable high-frequency current that provides.
2. light modulation process
The 0-20mA(or the 0-10mA that send here by electronic computer or other controller) current controling signal is by interface K
1, K
2Send into light/electric coupling IC
21,2 pin, from the corresponding with it electric current of an isolation of 5 pin output, this electric current is through R
2At IC
46 pin on produce a voltage signal, output pulse width is modulated, and the effective value by drive circuit control DC/AC power converter output current.When control signal equaled OmA, minimum current value of adjusting according to different gaseous discharge lamps of corresponding output was when control signal equals 20mA(or 10mA) time, lowest high-current value of adjusting according to different gaseous discharge lamps of then corresponding output.The current detecting ring detects the working current value of fluorescent tube; when the operating current of fluorescent tube during greater than the lowest high-current value adjusted according to different gaseous discharge lamps; the filtration protective circuit is started working, and the restriction electric current no longer continues to increase, and the protective gas discharge lamp is reason overcurrent and damaging not.
Trimmer potentiometer W
1Be used for the setting of maximum pulse width, adjust W
1Can change the maximum of lamp works electric current.Trimmer potentiometer W
2Be used for the setting of minimum pulse width, adjust W
2Can change the minimum value of lamp works electric current.Trimmer potentiometer W
3Be used for adjusting of fluorescent tube overcurrent protection value, adjust W
3Can change the maximum set value of lamp works electric current.
Effect of the present invention is:
1. adopted time ratio control principle, the apply pulse width modulation mode, the light energy that the way of utilization change lamp works voltage and operating current effective value is come the control gaseous discharge lamp, carrying out light modulation lights a lamp, make gaseous discharge lamp suddenly become the tunable optical light source, widened the range of application of gaseous discharge lamp by non-adjustable radiant.
2. adopt higher operating frequency (about 20KHz), overcome stroboscopic phenomenon effectively and reduced scintillation index, improved the quality of light, satisfied the needs of national economy and people's lives.
3. two results by band * in NG-250 sodium vapor lamp electricity/optical tests tables of data can illustrate that this device has about 93% high efficiency, raise the efficiency approximately 10% than traditional ignition device, are the energy-conservation ignition devices of a kind of rising electronic high-effective.(table is seen the literary composition back)
4. this device can make gaseous discharge lamp normal and stable operation in the supply voltage scope of 150V～240V, and it is narrow to have solved the gaseous discharge lamp operating voltage range of using traditional ignition device, the weakness of extinguishing easily during mains fluctuations.(table is seen the literary composition back)
Figure one is the light of several frequently seen gaseous discharge lamp, the curve that electrical quantity changes with the supply voltage effective value.Wherein (a) is that mercury lamp, (b) are metal halide lamp for sodium vapor lamp, (c), (d).Variable Ue is that supply voltage effective value, U are that light tube electric voltage, I are that lamp current, P are that power of lamp tube, F are that luminous flux, H are that fluorescent tube light efficiency, Tc are colour temperature.
Figure two is this setup time Ratio Analysis Diagrams.
Figure three is high-low pressure gaseous discharge lamp light dimming device circuit block diagrams.
Figure four is this device V/W modulation waveform figure.
Figure five is this device circuit figure.
Figure six is shape assumption diagrams of this device.
Embodiments of the invention are:
Device has comprised the gaseous discharge lamp required armamentarium of lighting a lamp, and therefore not only can be used as light modulating device and has used but also can be used as common ignition device and use, and can also use as the light dimming device of low-pressure gaseous discharge lamp.
1. not light modulation using method
K is connected to the 9V positive electrode of power with machine introskip line end, and K is connected to 9V power supply-utmost point.Output socket is connected the gaseous discharge lamp that is consistent with this device regulation, and power line is connected the 220V power supply, and the power turn-on switch gets final product operate as normal.
2. utilize this tractor driver to move light modulation
Wiring is with not light modulation using method, with trimmer potentiometer W in the machine
1Be changed to potentiometer and load onto knob, adjust W
1Can change the size of lamp works electric current, reach the purpose of light modulation.
3. manually/the computer remote light modulation
With 0-20mA(or 0-10mA) manually/computer control signal access socket K
1, K
2(note: K
1Meet+utmost point K
2Connect-utmost point), change manual/computer control signal and can change the size of lamp works electric current, reach the purpose of light modulation.The working control distance depends on the size of manual/computer control signal source electric current loop load capacity.
NG-250 sodium vapor lamp electricity/optical tests tables of data
The explanation of the total light efficiency lamp of electric current and voltage general power luminous flux power device efficient
（V） （A） （W） （Lm） （Lm/W） （W） （%）
242 3.20 390 30,800 79.0 Inductive ballasts
* 220 2.80 310 26,250 84.7 260 83.87% Inductive ballasts
198 2.50 250 20,650 82.6 Inductive ballasts
242 2.50 350 31,500 90.0 ignition devices
220 2.40 300 27,650 92.2 ignition devices
* 214 2.20 280 26,250 93.8 260 92.86% ignition devices
198 2.00 235 21,910 93.2 ignition devices
150 1.40 135 9,310 69.0 ignition devices
The high light efficiency metal halide lamp of DJZ-400 prototype experiment tables of data
The explanation of electric current and voltage power account for voltage current power
（V） （A） （W） （V） （A） （W）
235 2.44 573 230 2.38 547
225 2.31 520 220 2.25 495
215 2.15 462 210 2.10 441
205 2.00 410 200 1.92 384
195 1.83 357 190 1.72 327
185 1.63 302 180 1.53 275
175 1.46 256 170 1.37 233
165 1.28 211 160 1.20 192
155 1.11 172 150 1.03 154
145 0.94 136 135 0.78 105
130 0.70 91 125 0.00 0 extinguish
Claims (4)
1, a kind of high-low pressure Dimming for Discharge Lamps ignition device is made up of inductance, electric capacity, transformer, gaseous discharge lamp, it is characterized in that being made of trigger point circuit for lamp and light adjusting circuit:
A. the trigger point circuit for lamp is 220V, and the 50Hz power frequency supply is through diode D
10～D
13And capacitor C
11, C
12After rectifying and wave-filtering is converted to DC power supply, supply by Q
4, Q
5Pipe is formed the DC/AC power converter and is converted to high frequency electric source, by current detecting ring L
3, L
4And high frequency ballast L
5Provide high-frequency current to gaseous discharge lamp.When gaseous discharge lamp did not ignite, lamp current was zero, current detecting ring L
4There is not the output of the electric current of detection, transistor Q
3End diac D
14Make bidirectional thyristor SCR triggering and conducting, DC power supply is through R
12Fill at C
13On voltage, by SCR to L
6Discharge makes L
5On induce high-voltage pulse fluorescent tube puncture started, after fluorescent tube started, lamp current was greater than zero, L
4The output of the electric current of detection is arranged, transistor Q
3Conducting makes diac D
14And capacitor C
14Short circuit, thyristor SCR no longer is triggered, the out-of-work circuit of trigger.
B. light adjusting circuit is that current controling signal is by interface K
1, K
2Send into light/electric coupling IC
21,2 pin, from 5 pin output currents through R
2At IC as voltage/pulse width modulator
46 pin on produce a control voltage, output pulse width is modulated, simultaneously by trigger IC
3The square type CP frequency pulse of 13 pin output, through R
5, R
9Enter IC
4Control voltage end 5 pin and the circuit that compares modulation of the control voltage on 6 pin.
2, light dimming device according to claim 1 is characterized in that trigger IC
310,1 pin export two road 1/2 anti-phase each other frequency clock signals, be connected respectively to as the IC that divides phase modulation
56,2 pin, carry out phase-splitting modulation after, by transistor Q
1, Q
2Do to drive amplify and through transformer TR
2TR
3Isolate bi-directional voltage stabilizing pipe DW
1DW
2Behind the amplitude limit, send into field effect transistor Q
4, Q
5Grid form high frequency square wave power supply.
3, light dimming device according to claim 1 is characterized in that the choke L as high frequency ballast
5With trigger winding L
6On same pair of iron core.
4, light dimming device according to claim 1 is characterized in that trimmer potentiometer W in voltage/pulse-width modulation circuit
1Be used for the setting of maximum pulse width, trimmer potentiometer W
2Be used for the setting of minimum pulse width, trimmer potentiometer W
3Be used for adjusting of fluorescent tube overcurrent protection value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105763 CN1022453C (en) | 1990-02-01 | 1990-02-01 | Light-adjusting lighting device for high-low pressure gas discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105763 CN1022453C (en) | 1990-02-01 | 1990-02-01 | Light-adjusting lighting device for high-low pressure gas discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1044886A CN1044886A (en) | 1990-08-22 |
| CN1022453C true CN1022453C (en) | 1993-10-13 |
Family
ID=4879566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90105763 Expired - Fee Related CN1022453C (en) | 1990-02-01 | 1990-02-01 | Light-adjusting lighting device for high-low pressure gas discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022453C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001031981A1 (en) * | 1999-10-25 | 2001-05-03 | William Yu | Fluorescent lamp electronic ballast suitable for light-regulating |
| CN1708203B (en) * | 2005-04-08 | 2010-07-21 | 上海匣承机电科技有限公司 | Fluorescent/sodium lamp illumination power-saving device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166190A (en) * | 2011-12-19 | 2013-06-19 | 苏州能健电气有限公司 | Alternating current variable-pitch motor protection device and method |
| CN103166189A (en) * | 2011-12-19 | 2013-06-19 | 苏州能健电气有限公司 | Delayed alarm protection method for alternating current (AC) variable-pitch motor |
| CN104066261B (en) * | 2014-06-16 | 2017-03-15 | 广州斯全德灯光有限公司 | Sine wave dimming method and sinusoidal dimmer under overcurrent protection mechanism |
| CN107148127B (en) * | 2017-07-21 | 2018-06-26 | 肖旭华 | A kind of method for detecting power supply or dimming light source performance to be measured automatically |
-
1990
- 1990-02-01 CN CN 90105763 patent/CN1022453C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001031981A1 (en) * | 1999-10-25 | 2001-05-03 | William Yu | Fluorescent lamp electronic ballast suitable for light-regulating |
| CN1708203B (en) * | 2005-04-08 | 2010-07-21 | 上海匣承机电科技有限公司 | Fluorescent/sodium lamp illumination power-saving device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1044886A (en) | 1990-08-22 |
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