CN100579324C - LED color change device for synchronous control and switching of change mode - Google Patents
LED color change device for synchronous control and switching of change mode Download PDFInfo
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Abstract
The invention provides a LED color change device that can synchronously control and switch a change mode which acquires an AC power frequency by utilizing an AC power frequency sampling circuit and takes the AC power frequency as the reference for time calculation to carry out the synchronously control over the LED color change device. The synchronous color change can be maintained for a long time when the LED color change device in the same area reaches illumination and color change together. a power failure can be detected by means of a power failure detection circuit and a short-time emergency power which is necessary in power failure is provided by a storage unit and power circuit to the control circuit in order to switch to the next color change mode. In this manner, the user can freely switch to various color change modes by switching the power switch instead of staying to a single and fixed color change mode. The invention has another function that can automatically determine whether the AC power frequency is 60Hz or 50Hz and can automatically correct the errors which allows the time of color change of the invention is the same under the conditions of 60Hz or 50Hz.
Description
Affiliated technical field
The present invention is the control device of a kind of LED, refers to a kind of each LED of supply frequency Synchronization Control that utilizes especially, and can switch light-emitting diode changes luminance under multiple changing pattern control device arbitrarily.
Background technology
The manufacturing technology of light-emitting diode (LED) is after the monochromatic light restriction that breaks through originally, it is changeable to utilize the mixed light skill to make photochromic kind more enrich, and the advantage that possesses power saving, high brightness, make all significantly expansions of the application of light-emitting diode aspect each field, for example the light fixture manufacturer is convenient produces illumination miscellaneous or decorative lamp with light-emitting diode as the light source part.
After the LED of a plurality of single formulas assembled, cooperate specific drive circuit can become a LED allochroic bulb.And existing LED allochroic bulb promptly is to utilize most different photochromic LED to make as its light source spare, and only existing LED allochroic bulb faces the problem that is difficult to Synchronization Control also aspect practical application.
Because each light-emitting diode allochroic bulb all has an independently oscillator, the frequency of oscillation of utilizing this oscillator to produce is come the benchmark as Time Calculation, make the LED allochroic bulb can carry out the conversion of shades of colour and operating mode according to this time reference, but it is identical that the frequency of each oscillator is difficult to, still can have a little error each other, even can deserve to be called synchronization job reluctantly in each oscillator fashion of working at the beginning, but operating after after a while, because the accumulated time of error, make allochroic bulb synchronism each other lose fully, will present rambling variation so the action of bulb shows.
In addition, this LED color-changing device still has other shortcoming, is exactly that the variable color pattern can't be switched.For example, to adopt one second moment to become a kind of color for example red, blue, green, orange for some Color-changing lamps ....; Some Color-changing lamp is variable color pattern gradually in addition, for example by red to green, be slowly to transfer to pale redly by red, slowly change light green again and change green more gradually by light green.But, so will make the application of Color-changing lamp limited in case after selected good a kind of variable color pattern, in this single kind of pattern, can't change with regard to permanent set.And the user also can be bored with after having seen for a long time single kind of variable color pattern, thinks the another kind of variable color pattern of conversion.
Summary of the invention
As can be known with existing LED color-changing device, if several are difficult to synchronous problem just meet when lighting variable color together after a period of time running, and the fixing a kind of pattern of variable color pattern, can't switch the problem of variable color pattern by above stated specification.
The present invention solves above-mentioned two problems simultaneously, a kind of LED color-changing device that utilizes ac power frequency to carry out Synchronization Control promptly is provided, when allowing several LEDs color-changing devices light variable color together, even through still keeping synchronous variable color for a long time, and can be by the Switching power switch, switch its variable color pattern, can only not fix a kind of device of variable color pattern.
In addition, the present invention also automatically the identification ac power frequency be 50Hz or 60Hz system.For example, alternating current in the China's Mainland is the system that adopts 50Hz, if work out the words of a color of light-emitting diode each second variation according to this for benchmark, when in case change the AC power of using 60Hz in Taiwan into, then the action of LED changes and will be changed into by each second originally to just changing one time color in per 0.83 second.So will cause the error on the specification, therefore the present invention, the identification ac power frequency is 50Hz or 60Hz system automatically, revises this error automatically, allow the present invention's LED color-changing device no matter be applied in 50Hz or 60Hz system, its variable color time length is all consistent.
For reaching the purpose synchronous with ac power frequency, the present invention's control device consists predominantly of:
At least one AC/DC converting circuit is that an AC power is converted to DC power supply;
One ac power frequency sample circuit is to connect aforementioned AC power taking out the operating frequency of this AC power, and exports a pair of continuous pulse wave that should operating frequency;
One control circuit, have many group changing patteries in the system, this control circuit system connects aforementioned ac power frequency sample circuit receiving this continuous pulse wave, detects the operating frequency of AC power based on the continuous square wave that receives, and produces a control signal according to changing pattern and operating frequency;
One drive circuit is the output that connects aforementioned AC/DC converting circuit and control circuit, drives plural LED according to the control signal of this control circuit output, makes those LED synchronous workings.
Another object of the present invention system provides a kind of device that can switch changing pattern arbitrarily, is to allow the user, utilizes power change-over switch, selects a changing pattern to use control LED voluntarily, presents suitable color and the variation that flickers according to this pattern.
For reaching this purpose, be to be provided with a power failure detection circuit and an energy storage and power supply circuits between aforementioned AC/DC converting circuit and control circuit, be to utilize this power failure detection circuit to monitor DC power supply in real time to have or not outage, if there is outage to take place, when cutting off the power supply, provide an of short duration power supply by aforementioned energy storage and power supply circuits again, allow the of short duration by this power-on time of this control circuit, wait for that power supply recovers again, if in this of short duration power-on time, power supply can recover again, then can switch to next variable color pattern.If in this of short duration power-on time, power supply can't be sent a telegram in reply again, then when power supply was opened again next time, this Color-changing lamp was promptly reset (Reset), gets back to the most original state.
The present invention's another purpose is to provide a kind of can judge automatically that AC power is the device of which kind of operating frequency, and which kind of operating frequency no matter light-emitting diode be under, still can drive at interval with reasonable time/close.
For reaching aforementioned purpose, this control circuit system connects a timing circuit, obtains cycle of continuous pulse wave with this timing circuit, with the counter operating frequency of releasing AC power of this periodic quantity.
Relevant the present invention's all the other detailed circuits and explanation lie in graphic detailed description the in detail of cooperation in the following execution mode.
Description of drawings
Fig. 1: the circuit block diagram that is the present invention.
Fig. 2: the detailed circuit diagram that is ac power frequency sample circuit of the present invention.
Fig. 3: the schematic diagram that is control circuit detecting ac power frequency of the present invention.
Fig. 4: the circuit diagram that is energy storage of the present invention and power supply circuits and outage checking circuit.
Fig. 5: be that the present invention can use one of AC power embodiment schematic diagram.
Fig. 6: be another embodiment schematic diagram that the present invention can use AC power.
Fig. 7: the outside drawing that is one embodiment of the invention.
Fig. 8: the outside drawing that is another embodiment of the present invention.
Fig. 9: the outside drawing that is further embodiment of this invention.
The primary clustering symbol description
(1) LED color-changing device (10) AC/DC converting circuit
(20) ac power frequency sample circuit (21) optical coupler
(22) rectifier diode (23) current-limiting resistance
(24) output resistance (30) control circuit
(31) timing circuit (35) power failure detection circuit
(36) comparison circuit (40) energy storage and power supply circuits
(42) storage capacitor (43) diode
(50) drive circuit (60) light-emitting diode
(70) transformer (80) mains switch
Embodiment
At first seeing also shown in Figure 1ly, is the circuit block diagram of LED color-changing device of the present invention (1), includes:
At least one AC/DC converting circuit (10), its input system connects an AC power, and the AC power of importing is converted to DC power supply;
One ac power frequency sample circuit (20), its input system connects aforementioned AC power, taking out the frequency of this AC power, and sends the corresponding continuous pulse wave that is somebody's turn to do in its output;
One control circuit (30), have many group changing patteries in the system, this control circuit (30) one inputs system connects aforementioned ac power frequency sample circuits (20) receiving this continuous pulse wave, and pulse wave must be synchronous with ac power frequency by this, and produces a control signal according to changing pattern;
One energy storage and power supply circuits (40), its input system connects the DC power supply of aforementioned AC/DC converting circuit (10), under the power supply normal condition, the DC power supply system of AC/DC converting circuit (10) gives control circuit (30) via energy storage and power supply circuits (40) power supply, when outage, the own system of energy storage and power supply circuits (40) can provide an of short duration power supply to give control circuit (30);
One outage checking circuit (35), one input end system connects the DC power supply of aforementioned AC/DC converting circuit (10), another input system connects the output of aforementioned energy storage and power supply circuits (40), just judge whether cut off the power supply by two input terminal voltages relatively, and the result provided give control circuit (30);
One drive circuit (50), system connects the output of aforementioned AC/DC converting circuit (10) and control circuit (30), receive this DC power supply and control signal, to plural light-emitting diode (60), the work that makes light-emitting diode (60) have synchronous coordination changes according to this control signal output appropriate driving signal.
Aforementioned control circuit (30) can be learnt by aforementioned power failure detection circuit (35) and have or not the generation off-position, when cutting off the power supply, obtain an of short duration power supply by aforementioned energy storage and power supply circuits (40) again, make this control circuit (30) utilize this of short duration outage/telegram in reply to change, switch to another variable color pattern.
As shown in Figure 2, aforementioned ac power frequency sample circuit (20) mainly is to constitute with an optical coupler (21), the inner light-emitting diodes piping of this optical coupler (21) is connected with a rectifier diode (22) and a current-limiting resistance (23), the AC power system of input becomes the half-wave waveform after through this rectifier diode (22) and current-limiting resistance (23) rectification, the power drives of this light-emitting diodes piping after by this rectification; The inner photistor system of this optical coupler (21) is connected between an output resistance (24) and the ground connection again, and the other end of this output resistance (24) system connects this DC power supply.When the half-wave string ripple after the inner light-emitting diode of aforementioned optical coupler (21) is by rectification drives and lights, system can drive the photistor conducting, by photistor conduction and cut-off alternately, go up the continuous pulse wave that system can produce one-period property in output resistance (24).
See also shown in Figure 3ly, the continuous square wave system that aforementioned ac power frequency sample circuit (20) is sent inputs to this control circuit (30), and control circuit (30) judges according to square wave continuously the operating frequency of AC power is to be which kind of kenel.If AC power is 50Hz, each cycle approximately is 20ms after then converting, if AC power is that then each cycle approximately is 16.6ms to 60Hz, after power supply one activates, this control circuit (30) is after detecting first square wave, activate a timing circuit (31) immediately and pick up counting, after detecting next square wave, just stop timing.Present power supply is 60Hz if the interval between the two adjacent square waves is approximately 16.6ms Shi Ze representative, represents power supply to should be 50Hz if be approximately 20ms Shi Ze at interval.Control circuit (30) is just according to the benchmark of this operating frequency that detects out as LED variable color timing, therefore even be operated under different frequency 60Hz or the 50Hz, this control circuit (30) also can be controlled LED (for example each second, five seconds ...) variable color synchronously together in the fixing period accurately.
Please refer to shown in Figure 4, the circuit diagram that interconnects for energy storage and power supply circuits (40), power failure detection circuit (35) and control circuit (30).This energy storage and power supply circuits (40) consist predominantly of storage capacitor (42) and diode (43), this DC power supply system is connected to the positive pole of this diode (43), the negative pole system of this diode (43) is connected to the power input of control circuit (30) and an end of this storage capacitor (42), and the end in addition of this storage capacitor (42) is a ground connection.It is saturated to keep certain electric weight that wherein storage capacitor (42) lies in when working at ordinary times charging, therefore when outage, intercept by diode (43), storage capacitor (42) only can be at control circuit (30) and power failure detection circuit (35) power supply, and using provides an interim of short duration working power; This power failure detection circuit (35) consists predominantly of a comparison circuit (36), this comparison circuit (36) tool two inputs, its first input end system connects the DC power supply that this AC/DC converting circuit (10) is exported, second input system connects the output of this energy storage and power supply circuits (40), and this power failure detection circuit output system connects control circuit (30).
The action specification of Fig. 4 is as follows: when the DC power supply normal power supply, because there is a small pressure drop (for example 0.7V) in diode (43) itself, therefore DC power supply inputs to after comparison circuit (36) second inputs through diode (43), input voltage inevitable input voltage this moment of this comparison circuit (36) first input end greater than second input, so comparison circuit (36) is that the signal of exporting the first accurate position (for example high levle) is given control circuit (30).Simultaneously, this DC power supply system through diode (43) after, simultaneously storage capacitor (42) is charged and inputs to control circuit (30), as the working power of control circuit (30).When DC power supply is interrupted suddenly, this direct voltage of comparison circuit (36) first input end reduces to zero immediately suddenly, but the voltage of comparison circuit (36) second inputs is owing to be that storage capacitor (42) discharges gradually, allow voltage slowly reduce, therefore when the voltage of second input is higher than the voltage of first input end, cause the accurate position of comparison circuit (36) output to change (for example becoming low level), control circuit (30) is detected this change, learn and be outage, make control circuit (30) enter the emergency treatment pattern, because this storage capacitor (42) promptly is in charged state at ordinary times, so inner stored electric power can be exported immediately, as an interim power supply, make control circuit (30) and power failure detection circuit (35) can still normally keep work at short notice.
Suppose in this storage capacitor (42) can be kept the time that storage electric power is provided (for example 5 seconds), DC power supply has just been recovered normal power supply, then the output meeting of comparison circuit (36) transforms back into high levle from low level, and keep normal operation owing to control circuit (30) has the electric power of acquisition all the time, change so can detect the output state of comparison circuit (36), can will control the changing pattern forward impelling of light-emitting diode (60) to next changing pattern.
Can keep the time (for example 5 seconds) that stores electric power that provides if surpass this storage capacitor (42), because the storage electric power of storage capacitor (42) exhausts all, so can't keep the required power for operation of control circuit (30), after in case DC power supply is recovered, control circuit (30) will be reset (Reset) and enable first group of changing pattern of controlling light-emitting diode (60), can't be advanced into next changing pattern automatically.
So can allow LED color-changing device (1), by the pass of Switching power switch and the time length of opening, decision is to want LED color-changing device (1) replacement to get back to first LED variable color pattern, or will continue to switch to next LED variable color pattern.For example suitably select this storage capacitor (42), allow its stored electric energy, can allow control circuit (30) and 5 seconds of power failure detection circuit (35) work, then switch continuously in 5 seconds can allow LED color-changing device (1) be advanced into the changing pattern of next LED automatically; On the other hand if turn off LED color-changing device (1), surpass after 5 seconds power-on again, LED color-changing device (1) can be reset the changing pattern of getting back to first LED automatically.
In the aforementioned embodiment, the present invention has utilized an energy storage and power supply circuits (40) to provide Emergency Power to give power failure detection circuit (35) and control circuit (30) simultaneously, only example also can use two independently energy storage provide Emergency Power to give power failure detection circuit (35) and control circuit (30) respectively with power supply circuits.
In like manner in the aforementioned embodiment, the present invention has utilized an AC/DC converting circuit (10) to provide DC power supply to use to each circuit simultaneously, only example also can use at least one independently AC/DC converting circuit (10) to offer the less ac power frequency sample circuit (20) of power consumption respectively, energy storage and power supply circuits (40), power failure detection circuit (35), and the bigger drive circuit (50) of power consumption, light-emitting diode (60) uses.The use of dimension reality can determine according to each circuit required voltage and electric current.The variation of all genus equivalent structures all in like manner is contained in the present invention's the scope.About being set in the variable color pattern of this control circuit (30); can be with reference to the cited several aspects of following table; listed pattern is only for illustrating in table; visual demand is adjusted arbitrarily during actual the use; the switching that changes modelling can utilize a switch to implement; have or not working power and make control circuit (30) change present changing pattern with this switch control, its details is detailed later:
| Changing pattern | Explanation |
| Pattern one | Each second jumped the look circulation |
| Pattern two | Jumped the look circulation in per five seconds |
| Pattern three | Gradual change look circulation fast |
| Pattern four | Gradual change look circulation at a slow speed |
| Pattern five | The circulation of cool colour phyletic gradualism look |
| Pattern six | The circulation of warm colour phyletic gradualism look |
| Pattern seven | The gradual change look is jumped the circulation of look intersection |
| Pattern eight | Blueness is variable color pattern (transfer as a pale blue dark blue) |
| Pattern nine | Green is the variable color pattern |
| Pattern ten | Red colour system variable color pattern |
In practical application, aforementioned control circuit (30), timing circuit (31) can be formed a control IC altogether with this power failure detection circuit (35).Certainly also can allow control circuit (30), timing circuit (31) form a control IC altogether, and allow this power failure detection circuit (35) be an independent circuits.
See also Fig. 5, be one of LED color-changing device (1) Application Example, comprise a mains switch (80) and a plurality of LED color-changing device (1), these a plurality of LED color-changing devices (1) do not limit to the same space, and it can different floors, different buildings, different squares as long as mains switch (80) switches simultaneously, can switch to identical variable color pattern simultaneously.
See also shown in Figure 6, another embodiment for LED color-changing device (1), the present invention is when connecting AC power, can see through a transformer (70) and obtain AC power than low pressure, the primary side of this transformer (70) is connected to AC power (for example 110V or 220V), AC power via this transformer (70) step-down after, export a lower AC power (for example 12V) in its secondary side, provide to each LED color-changing device (1) with the AC power after this step-down, wherein LED color-changing device (1) is to connect with parallel way.
This mains switch (80) promptly in order to the changing pattern of control control switching circuit (30), the user is if in hold time by the electric power that storage capacitor (42) is provided, and Switching power switch (80) just switches to the selected changing pattern of user continuously.
See also shown in Fig. 7,8,9, the appearance and modeling of the present invention's LED color-changing device (1) is not limited to, and is to be a LED projecting lamp as Fig. 7, and Fig. 8 is to be the electricity-saving lamp that light emitting source constituted with LED, and Fig. 9 is to be the LED striation that light emitting source constitutes with LED.
As shown in the above description, the present invention utilizes the operating frequency of AC power to be benchmark, most light-emitting diode groups of may command produce the visual effect that changes synchronously, even be under the long operation, those light-emitting diode groups still can keep high harmony action.Moreover the present invention can utilize the control of mains switch to switch the variation of various display modes and glow color, for example:
1. the user can select different changing patteries according to the personal like.
2. can cooperate various division of day and night needs and change color, for example select warm colour light morning for use, select for use at dusk and use cold white light etc. at tangerine coloured light, night.
3. can cooperate the four seasons different and change, for example the cool colour that can use makes us feeling refrigerant spring and summer is a light, is light and can change warm colour the season of autumn and winter into.
4. can arrange in pairs or groups the indoor decoration tone and select suitable light colour system for use.
More than, the present invention not only can solve the shortcoming of existing light-emitting diode coordination for a long time, and with the advantage of more practicalities.
The present invention appended graphic only provide with reference to and explanation usefulness, be not to be used for to the present invention's limitr in addition.Only the above only is the present invention's preferable possible embodiments, and the non-so promptly inflexible claim of limitting the present invention so use specification of the present invention and the equivalent structure variation for it of icon content institute such as, all in like manner is contained in the present invention's the scope.
Claims (11)
1. but a Synchronization Control and switch the L E D color-changing device of changing pattern mainly comprises:
At least one AC/DC converting circuit, its input system connects AC power, and the AC power of importing is converted to DC power supply;
One ac power frequency sample circuit, its input system connects aforementioned AC power, taking out the frequency of this AC power, and sends a corresponding continuous pulse wave in its output;
One control circuit, have many group changing patteries in the system, this control circuit one input system connects aforementioned ac power frequency sample circuit receiving this continuous pulse wave, and continuous pulse wave must be synchronous with ac power frequency by this, and produces control signal according to changing pattern;
At least one energy storage and power supply circuits, its input system connects aforementioned DC power supply, and at least one output is to be connected in control circuit; When outage, this energy storage and power supply circuits itself provide an of short duration power supply;
One power failure detection circuit, one input end system connects aforementioned DC power supply, and another input system connects the output of aforementioned energy storage and power supply circuits, just judges whether cut off the power supply by comparing two input terminal voltages, and comparative result provided gives control circuit;
One drive circuit is to connect the aforementioned DC power supply and the output of control circuit, and drives plural LED according to the control signal of this control circuit;
Wherein, aforementioned control circuit can be learnt by aforementioned power failure detection circuit and have or not the generation off-position, when cutting off the power supply, obtain an of short duration power supply by aforementioned energy storage and power supply circuits again, make this control circuit utilize this of short duration outage/telegram in reply to change, switch to another variable color pattern.
2. but, it is characterized in that wherein this ac power frequency sample circuit also comprises as the Synchronization Control as described in the right 1 and switch the LED color-changing device of changing pattern:
One optical coupler, this optical coupler have a light-emitting diode and a photistor, and wherein this light-emitting diodes piping is connected to this AC power through a rectifier diode and a current-limiting resistance; This photistor system is connected between an output resistance and the ground connection, and the other end of this output resistance system connects this DC power supply.
3. but, it is characterized in that wherein this energy storage and power supply circuits mainly comprise as the Synchronization Control as described in the right 1 and switch the LED color-changing device of changing pattern:
One diode, its anodal this DC power supply that connects, its negative pole system connects the power input of this control circuit;
One storage capacitor is to be connected between aforementioned diodes negative pole and the ground connection, and wherein storage capacitor lies in charging when working at ordinary times, when outage, intercept by aforementioned diodes, only at control circuit and power failure detection circuit power supply, using provides an interim of short duration working power.
4. but, it is characterized in that wherein this power failure detection circuit mainly comprises as the Synchronization Control as described in right 1 or 3 and switch the LED color-changing device of changing pattern:
One comparison circuit, tool two inputs, one input end system connects this DC power supply, and another input system connects the output of this energy storage and power supply circuits, and this comparison circuit output system connects control circuit.
5. but as the Synchronization Control as described in the right 1 and switch the LED color-changing device of changing pattern, it is characterized in that this control circuit system connects a timing circuit, calculate the cycle of continuous pulse wave and learn the operating frequency of AC power with this timing circuit.
6. but, it is characterized in that wherein this control circuit and this timing circuit are formed a control IC altogether as the Synchronization Control as described in the right 5 and switch the LED color-changing device of changing pattern.
7. but, it is characterized in that wherein this control circuit and this timing circuit and this power failure detection circuit are formed a control IC altogether as the Synchronization Control as described in the right 5 and switch the LED color-changing device of changing pattern.
8. but as Synchronization Control as described in the right 1 and switch the LED color-changing device of changing pattern, it is characterized in that this provides the AC power system that gives AC/DC converting circuit to be provided by an AC power, be to be provided with a mains switch between this AC power and the AC/DC converting circuit, with the changing pattern of this mains switch control switching circuit.
9. but as Synchronization Control as described in the right 1 and switch the LED color-changing device of changing pattern, it is characterized in that this provide the AC power system that gives AC/DC converting circuit by an AC power via the transformer step-down after institute provide, be to be provided with a mains switch between this AC power and the AC/DC converting circuit, with the changing pattern of this mains switch control switching circuit.
10. but as Synchronization Control as described in the right 1 and switch the LED color-changing device of changing pattern, it is characterized in that wherein, see outside this LED color-changing device and be shaped to a LED projecting lamp, a LED electricity-saving lamp or a LED striation.
11. but as the Synchronization Control as described in right 1 or 2 and switch the LED color-changing device of changing pattern, it is characterized in that cording has two energy storage and power supply circuits, give control circuit and power failure detection circuit for an interim of short duration working power indescribably in the outage time-division, each energy storage and power supply circuits system comprise a diode and a storage capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610163995A CN100579324C (en) | 2006-11-24 | 2006-11-24 | LED color change device for synchronous control and switching of change mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610163995A CN100579324C (en) | 2006-11-24 | 2006-11-24 | LED color change device for synchronous control and switching of change mode |
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| CN101193480A CN101193480A (en) | 2008-06-04 |
| CN100579324C true CN100579324C (en) | 2010-01-06 |
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| CN200610163995A Expired - Fee Related CN100579324C (en) | 2006-11-24 | 2006-11-24 | LED color change device for synchronous control and switching of change mode |
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2006
- 2006-11-24 CN CN200610163995A patent/CN100579324C/en not_active Expired - Fee Related
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| TWI675532B (en) * | 2019-02-26 | 2019-10-21 | 群光電能科技股份有限公司 | Power convertor |
| CN111614275A (en) * | 2019-02-26 | 2020-09-01 | 群光电能科技股份有限公司 | Power supply conversion device |
| CN111614275B (en) * | 2019-02-26 | 2021-08-27 | 群光电能科技股份有限公司 | Power supply conversion device |
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|---|---|
| CN101193480A (en) | 2008-06-04 |
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