CN110572896A - Driver for an LED device, LED system and method for adapting an LED device - Google Patents
Driver for an LED device, LED system and method for adapting an LED device Download PDFInfo
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- CN110572896A CN110572896A CN201810575711.XA CN201810575711A CN110572896A CN 110572896 A CN110572896 A CN 110572896A CN 201810575711 A CN201810575711 A CN 201810575711A CN 110572896 A CN110572896 A CN 110572896A
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Abstract
a driver for a light emitting diode device is coupled between a ballast and the light emitting diode device and includes a rectifier, a current regulator, and a detection module. The rectifier is configured to be coupled to the ballast and configured to convert an alternating current from the ballast into a direct current. The current regulator is coupled between the rectifier and the light emitting diode device and is used for receiving direct current from the rectifier and outputting driving current to the light emitting diode device. The detection module is used for detecting a signal representing the output characteristic of the ballast in the starting phase of the light-emitting diode device. When the signal meets a preset condition, the current regulator is used for converting the direct current from the rectifier into the driving current, the value of the driving current is smaller than or equal to a preset current threshold value, and the preset current threshold value is smaller than the maximum current which can be borne by the light-emitting diode device under the condition of no damage.
Description
Technical Field
Embodiments of the invention relate to a driver for an LED arrangement, an LED system and an adaptation method of an LED arrangement.
Background
in recent years, the market for retrofit lighting has grown substantially. The LED lamp can be modified to replace the original fluorescent lamp, so that the luminous efficiency is improved, and the lighting effect is improved.
However, there is a problem of adaptation between the LED lamp and the ballast of the original fluorescent lamp. Because the current values output by different types of ballasts have large difference, different LED loads are generally required to be designed for different types of ballasts in the prior art, and the design and production cost is greatly increased.
Therefore, it is necessary to provide a new driver for LED device, an LED system and an adaptation method of LED device to solve the above problems.
Disclosure of Invention
a driver for a light emitting diode device is coupled between a ballast and the light emitting diode device for adapting the light emitting diode device to the ballast. The driver includes a rectifier, a current regulator, and a detection module. The rectifier is configured to be coupled to the ballast and configured to convert an alternating current from the ballast into a direct current. The current regulator is coupled between the rectifier and the light emitting diode device and is used for receiving direct current from the rectifier and outputting driving current to the light emitting diode device. The detection module is used for detecting a signal representing the output characteristic of the ballast in the starting phase of the light-emitting diode device. When the signal meets a preset condition, the current regulator is used for converting the direct current from the rectifier into the driving current, the value of the driving current is smaller than or equal to a preset current threshold value, and the preset current threshold value is smaller than the maximum current which can be borne by the light-emitting diode device under the condition of no damage.
A light emitting diode system comprises a light emitting diode device and a driver for the light emitting diode device for coupling between a ballast and the light emitting diode device and for adapting the light emitting diode device to the ballast. The driver includes a rectifier, a current regulator, and a detection module. The rectifier is configured to be coupled to the ballast and configured to convert an alternating current from the ballast to a direct current. The current regulator is coupled between the rectifier and the light emitting diode device and is used for receiving direct current from the rectifier and outputting driving current to the light emitting diode device. The detection module is used for detecting a signal representing the output characteristic of the ballast in the starting phase of the light-emitting diode device. When the signal meets a preset condition, the current regulator is used for converting the direct current from the rectifier into the driving current, the value of the driving current is smaller than or equal to a preset current threshold value, and the preset current threshold value is smaller than the maximum current which can be borne by the light-emitting diode device under the condition of no damage.
A method of adapting a light emitting diode device to a ballast, comprising: converting alternating current from the ballast into direct current through a rectifier; receiving, by a current regulator, a direct current from the rectifier and outputting a driving current to the light emitting diode device; detecting a signal characterizing an output characteristic of the ballast during a startup phase of the light emitting diode device; and when the signal meets a preset condition, converting the direct current from the rectifier into the driving current, wherein the value of the driving current is less than or equal to a preset current threshold value, and the preset current threshold value is less than the maximum current which can be borne by the light-emitting diode device under the condition of no damage.
Drawings
These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
FIG. 1 is a schematic diagram of an LED system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an LED system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of an LED system according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of an LED system according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of an LED system according to another embodiment of the present invention; and
fig. 6 is a flow chart illustrating a method for adapting an LED device and a ballast according to an embodiment of the present invention.
Detailed Description
To assist those skilled in the art in understanding the claimed subject matter, a detailed description of the invention is provided below along with accompanying figures. In the following detailed description of the embodiments, well-known functions or constructions are not described in detail in order to avoid unnecessarily obscuring the present disclosure.
unless otherwise defined, technical or scientific terms used in the claims and the specification should have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. As used in this specification and the appended claims, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms "a" or "an," and the like, do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "having", and the like, means that the element or item appearing before "comprises" or "having" covers the element or item listed after "comprising" or "having" and its equivalent, but does not exclude other elements or items.
Embodiments of the present invention relate to an LED driver, and an LED system including the same. The LED driver enables the LED device to be adapted to ballasts of various models, so that an LED system comprising the LED driver can be suitable for ballasts of various models.
fig. 1 is a schematic diagram of an LED system 100 according to an embodiment of the invention. Referring to fig. 1, the LED system 100 comprises an LED arrangement 120 and a driver 110 for the LED arrangement, the driver 110 being adapted to be coupled between a ballast 910 and the LED arrangement 120 and to adapt the LED arrangement 120 to the ballast 910, i.e.: the LED system 100 including the driver 110 can be normally operated after being coupled to the ballast 910.
Driver 110 includes a rectifier 111, a current regulator 113, and a detection module 115. The rectifier 111 is configured to be coupled to the ballast 910 and configured to convert an ac current from the ballast 910 into a dc current.
The current regulator 113 is coupled between the rectifier 111 and the LED device 120, and is configured to receive the dc current from the rectifier 111 and output a driving current to the LED device 120.
The detection module 115 is configured to detect a signal indicative of an output characteristic of the ballast 910 during a start-up phase of the LED apparatus 120; the start-up phase is a time period from the time when the ballast 910 is powered on to the time when the LED device is turned on, and is usually within 0.1 to 2 seconds from the time when the ballast is powered on to the time after the power is turned on. Since different types of ballasts have different output characteristics, when a signal representing the output characteristics of the ballast 910 is detected, the output current can be processed according to the output characteristics, so that the driving current finally output to the LED device 120 meets the operating requirements of the LED device.
When the signal satisfies a predetermined condition, that is: when the output characteristic of the ballast represented by the signal is not compatible with the LED device, the current regulator 113 converts the dc current from the rectifier 111 into a driving current, the value of the driving current is less than or equal to a preset current threshold value, and the preset current threshold value is less than the maximum current that the LED device 120 can bear without damage; this ensures that the LED device 120 operates normally under the driving of the driving current. For example, in some embodiments, the preset current threshold is set to 40% -80% of the maximum current.
When the signal does not satisfy the preset condition, that is: the current regulator 113 is configured to output the dc current from the rectifier 111 to the LED device 120 as a driving current when the output characteristic of the ballast characterized by the signal is compatible with or compatible with the LED device. In this case, the dc current output by the rectifier 111 is smaller than the preset current threshold, so the current regulator 113 can directly transmit the dc current to the LED device 120 by short-circuit or the like, so that the LED device operates normally.
as shown in fig. 1, in some embodiments, the detection module 115 is coupled between the output of the ballast 910 and the current regulator 113, and is configured to detect the ac current or the ac voltage output by the ballast 910 during the start-up phase of the LED device 120 and output the detected signal to the current regulator 113.
In some embodiments, the detection indicators are as follows: the ac current output by the ballast or the ac voltage output by the ballast sets a corresponding preset value range, and when the ac current or the ac voltage output by the ballast is within the corresponding preset value range, the dc current output by the ballast 910 after being rectified by the rectifier 111 can directly meet the working requirement of the LED device, that is: since the dc current output from the rectifier 111 is equal to or less than the predetermined current threshold, the current regulator 113 directly outputs the dc current from the rectifier 111 to the LED device as the driving current without processing the dc current.
When the ac current or the ac voltage output by the ballast exceeds the corresponding preset value range, it indicates that the dc current output by the rectifier 111 cannot meet the working requirement of the LED device 120, and therefore, the current regulator 113 is required to convert the dc current and provide the converted dc current to the LED device 120. Thus, the preset conditions are set to: the values of the ac current output by the ballast and the ac voltage output by the ballast exceed the corresponding preset value ranges, and when the preset condition is met, the current regulator 113 converts or regulates the dc current.
In some embodiments, by analyzing the ac current or ac voltage output by the ballast 910, the output frequency of the ballast can be obtained, and a determination can be made as to whether to process the dc current output by the rectifier. Specifically, when the frequency of the ac current or the ac voltage output by the ballast 910 is lower than the preset frequency threshold, the current regulator 113 is configured to convert the dc current from the rectifier 111 into the driving current, and the value of the driving current is smaller than or equal to the preset current threshold. Therefore, in this case, the preset conditions are: the frequency of the ac current or ac voltage output by the ballast 910 is below a predetermined frequency threshold. In some embodiments, the preset frequency threshold is in a range of about 10 hertz to about 99 hertz.
The current regulator 130 is configured to output the dc current from the rectifier 110 as a driving current to the LED device when the frequency of the ac current or the ac voltage output by the ballast 910 is higher than a preset frequency threshold.
With continued reference to fig. 1, the LED device 120 includes a plurality of LED chips 121, and the plurality of LED chips 121 are connected in series with each other. In this case, the maximum current that the LED device 120 can withstand without being damaged is approximately equal to the rated current of the LED chip 121.
In some embodiments, the current regulator 113 includes a comparison and determination unit (not shown) for comparing the signal detected by the detection module 115 with a preset value range or threshold, and then determining whether to process and convert the dc current from the rectifier 111.
Alternatively, in some other embodiments, the comparison and determination unit may be integrated into the detection module. Specifically, the detection module may include a sampling circuit configured to sample the signal, and a determination circuit configured to determine whether the sampled signal satisfies a preset condition, and output a determination result signal to the current regulator.
In some embodiments, the current regulator 113 comprises a current sealer for reducing the dc current of the rectifier output to a value less than or equal to said preset current threshold when the signal satisfies said preset condition. The current scaler may include a switching circuit, and the scaling down of the direct current may be set by setting a duty ratio of the switch.
In some embodiments, the current regulator 113 comprises a constant current control module (not shown) for adjusting the drive current to be substantially constant at a value equal to or less than the preset current threshold when the signal satisfies the preset condition. Specifically, the constant current control module includes a feedback unit configured to detect a driving current output from the current regulator 113 to the LED device and feed back a real-time value of the driving current to the adjustment unit, and an adjustment unit configured to adjust the driving current according to a difference between the real-time value of the driving current and a desired value of the driving current, so that the value of the driving current is stabilized around the desired value, where the desired value of the driving current may be preset and may be set to be less than or equal to the preset current threshold.
Fig. 2 is a schematic diagram of an LED system 200 according to another embodiment of the present invention. Referring to fig. 2, the LED system 200 includes an LED device 220 and a driver 210 for driving the LED device. Driver 210 includes rectifier 211, current regulator 213, and detection module 215. Rectifier 211 is adapted to be coupled to ballast 910 and current regulator 213 is coupled between rectifier 211 and LED arrangement 220. The detection module 215 is coupled between the output terminal of the rectifier 211 and the current regulator 213, and is configured to detect a dc current or a dc voltage output by the rectifier 211 during a start-up phase of the LED device and provide a detected signal to the current regulator 213.
The detection indexes are as follows: the dc current or dc voltage output by the rectifier 211 has a corresponding preset value range, and when the dc current or dc voltage output by the rectifier 211 is within the corresponding preset value range, the current regulator 213 is configured to output the dc current from the rectifier 211 as a driving current to the LED device.
When the dc current or the dc voltage output by the rectifier 211 exceeds the corresponding preset value range, the current regulator 213 converts the dc current from the rectifier 211 into a driving current, and the value of the driving current is less than or equal to a preset current threshold. Therefore, the preset condition is that the dc current or the dc voltage output by the rectifier 211 exceeds a corresponding preset value range.
In some embodiments, the LED device includes N groups of LED chips, the N groups of LED chips are connected in parallel with each other, wherein each group of LED chips includes a plurality of LED chips connected in series with each other, and the maximum current that the LED device can withstand without damage is substantially equal to N times of the rated current of each LED chip, where N is a natural number greater than or equal to 2.
As shown in fig. 2, in some embodiments, the LED device 220 includes 3 groups of LED chips connected in parallel, wherein each group of LED chips includes a plurality of LED chips connected in series, and the maximum current that the LED device 220 can withstand is approximately equal to 3 times the rated current of each LED chip.
The other functions and structures of the rectifier 211, the current regulator 213, and the detection module 215 are similar to those of the rectifier 111, the current regulator 113, and the detection module 115 in the embodiment shown in fig. 1, and are not described herein again.
Fig. 3 is a schematic diagram of an LED system 300 according to another embodiment of the present invention. Referring to fig. 3, the LED system 300 includes an LED device 320 and a driver 310. Driver 310 includes a rectifier 311, a current regulator 313, and a detection module 315. The rectifier 311 is for coupling to a ballast 910 and the current regulator 313 is coupled between the rectifier 311 and the LED arrangement 320.
the detection module 315 is coupled between the LED device 320 and the current regulator 313, and is configured to detect a current flowing through the LED device 320 during a start-up phase of the LED device and provide a detected signal to the current regulator 313.
the detection indexes are as follows: the current flowing through the LED device has a corresponding preset value range, and when the current flowing through the LED device is within the corresponding preset value range, the current regulator 313 is configured to output the direct current from the rectifier 311 to the LED device 320 as a driving current.
when the current flowing through the LED device 320 exceeds its corresponding predetermined value range, the current regulator 313 converts the dc current from the rectifier 311 into a driving current, and the value of the driving current is smaller than or equal to a predetermined current threshold, wherein the predetermined current threshold is smaller than the maximum current that the LED device can bear without being damaged. Therefore, the predetermined condition is that the current flowing through the LED device 320 exceeds the corresponding predetermined value range.
The other functions and structures of the rectifier 311, the current regulator 313 and the detection module 315 are similar to those of the rectifier 111, the current regulator 113 and the detection module 115 in the embodiment shown in fig. 1, and are not described herein again.
Fig. 4 is a schematic diagram of an LED system 400 according to another embodiment of the present invention. Referring to fig. 4, the LED system 400 includes an LED device 420 and a driver 410 coupled to the LED device 420. The driver 410 comprises an input module comprising a first input unit 417 and a second input unit 418, a rectifier comprising a first rectifying unit 411 and a second rectifying unit 412, a current regulator 413 and a detection module 415.
the first and second input units 417 and 418 are used for coupling with a ballast (not shown) and receiving an alternating current from the ballast. The first input unit 417 includes two input terminals coupled via a capacitor C4; similarly, the second input unit 418 comprises two input terminals coupled via a capacitor C8.
The first and second rectifying units 411 and 412 are used to convert ac current from the ballast into dc current. The first rectifying unit 411 includes a diode D1 and a diode D2 connected in series with each other, and the output terminal of the first input unit 417 is coupled to a node between the diodes D1 and D2. Similarly, the second rectifying unit 412 includes a diode D3 and a diode D4 connected in series with each other, and the output terminal of the second input unit 418 is coupled to a node between the diodes D3 and D4.
In some embodiments, the ac current of the ballast is input to the rectifier through the first and second input units 417 and 418, and the first and second rectifying units 411 and 412 operate simultaneously to convert the ac current into the dc current.
The detecting module 415 is coupled between the output terminal of the first input unit 417 and the current regulator 413, and is configured to detect the ac current or the ac voltage output by the ballast, determine whether the frequency of the ac current or the ac voltage output by the ballast is lower than a preset frequency threshold, and send a determination result signal to the current regulator 413.
Specifically, the detection module 415 includes a sampling circuit 416 and a determination circuit 419. The sampling circuit 416 comprises two capacitors C3 and C5, three diodes D9, D11 and D14, and two resistors R3 and R6; the determining circuit 419 includes a switch transistor M2 and a voltage regulator transistor D10. The diode D11, the diode D9, the resistor R3 and the diode D14 are sequentially connected in series. A first terminal of the capacitor C3 is coupled to the output terminal of the first input unit 417, and a second terminal of the capacitor C3 is coupled to a node between D9 and D11. The capacitor C5 has a first terminal coupled to the node between R3 and D14 and a second terminal coupled to the anode of D11. The cathode of D14 is coupled to the cathode of D10, the anode of D10 is coupled to the gate of switching tube M2, the drain of M2 is coupled to current regulator 413, and the source of M2 is coupled to the second terminal of C5. The first end of the R6 is coupled to the gate of M2, and the second end is coupled to the second end of C5.
When the frequency of the ac current or ac voltage output by the ballast is lower than a preset frequency threshold, the switching tube M2 is turned off, and an Enable signal (Enable) is output to the current regulator 413; when the frequency of the ac current or ac voltage output by the ballast is higher than the preset frequency threshold, the switching tube M2 is turned on, and a Disable signal (Disable) is output to the current regulator 413.
The current regulator 413 includes a first switch M1 and a switch controller 414 coupled to a control terminal of the first switch M1. Specifically, an output terminal of the switch controller 414 is coupled to a control terminal of the first switch M1; an input of the switch controller 414 is coupled to an output of the detection module 415, namely: drain of M2. The switch controller 414 is configured to send a control signal to the first switch M1 according to the determination result signal (i.e., the enable signal or the disable signal) from the detection module 415 to control the on/off or the duty ratio of the first switch M1, so as to control the magnitude of the driving current provided to the LED device 420.
When the switch controller 414 receives the enable signal from the detection module 415, it outputs a pulse signal with a certain duty ratio to the first switch M1 as a control signal of the first switch M1. The value of the driving current supplied from the current regulator 413 to the LED device 420 may be adjusted to be equal to or less than a preset current threshold by adjusting the duty ratio.
When the switch controller 414 receives the disable signal from the detection module 415, it outputs a continuous high signal to the first switch M1 to short the first switch M1, so that the current regulator outputs the dc current from the rectifiers 411, 412 as current to the LED device 420.
fig. 5 is a schematic diagram of an LED system 500 according to another embodiment of the invention. Referring to fig. 5, the LED system 500 includes an LED device 520 and a driver 510 coupled to the LED device 520. The driver 510 comprises an input module comprising a first input unit 517 and a second input unit 518, a rectifier comprising a first rectifying unit 511 and a second rectifying unit 512, a current regulator 513 and a detection module 515.
The first and second input units 517 and 518 and the first and second rectifying units 511 and 512 have the same structure and function as the first and second input units 417 and 418 and the first and second rectifying units 411 and 412 in the embodiment shown in fig. 4, respectively, and are not described herein again.
the detecting module 515 is coupled between the LED device 520 and the current regulator 513, and is configured to detect a current flowing through the LED device 520, determine whether the current value exceeds a preset value range, and output a determination result signal to the current regulator 513. When the current value of the LED device is within the preset value range, the detection module 515 outputs a disable signal to the current regulator 514, and when the current value of the LED device exceeds the preset value range, the detection module 515 outputs an enable signal to the current regulator 514.
in particular, the detection module 515 includes a sampling circuit 516 and a decision circuit 519. The sampling circuit 516 comprises resistors R1, R3 and a capacitor C3; the determination circuit 519 includes a comparator. Wherein R1 is connected in series with the LED device 520, which is coupled between the cathode of the LED device 520 and ground; a first terminal of R3 is coupled to the junction between R1 and LED device 520, and a second terminal thereof is coupled to an input terminal of comparator 519; c3 has a first terminal coupled to the input terminal of comparator 519 and a second terminal connected to ground; the output of the comparator 519 is coupled to the current regulator 513.
the current regulator 513 includes a first switch M1 and a switch controller 514 coupled to a control terminal of the first switch M1. Specifically, an output terminal of the switch controller 514 is coupled to a control terminal of the first switch M1; an input of the switch controller 514 is coupled to an output of the detection module 515, i.e.: an output of the comparator 519. The switch controller 514 is configured to send a control signal to the first switch M1 according to the determination result signal (i.e., the enable signal or the disable signal) from the detection module 515 to control the on/off or the duty ratio of the first switch M1, so as to control the magnitude of the driving current provided to the LED device 520.
When the switch controller 514 receives the enable signal from the detection module 515, it outputs a pulse signal with a certain duty ratio to the first switch M1 as a control signal of the first switch M1. The value of the driving current supplied from the current regulator 513 to the LED device 520 may be adjusted by adjusting the duty ratio so as to be equal to or less than a preset current threshold.
When the switch controller 514 receives the disable level signal from the detection module 515, it outputs a continuous high signal to the first switch M1 to short the first switch M1 so that the current regulator outputs the dc current from the rectifiers 511, 512 as current to the LED device 520.
Embodiments of the present invention also relate to a method of adapting an LED fixture and a ballast that enables the same LED fixture to be adapted to a plurality of different types of ballasts.
Fig. 6 is a flowchart illustrating an adaptation method 600 according to an embodiment of the invention.
In step 610, ac current from the ballast is converted to dc current by a rectifier.
In step 620, a direct current from the rectifier is received by a current regulator and a drive current is output to the LED device.
In step 630, a signal characterizing the ballast output characteristics is detected during a startup phase of the LED arrangement; wherein the signal comprises an alternating current output by the ballast, an alternating voltage output by the ballast, a direct current output by the rectifier, a direct voltage output by the rectifier, a current flowing through the LED device, or a combination thereof.
In step 640, it is determined whether the signal satisfies a predetermined condition. In some embodiments, the preset conditions are: the frequency of the alternating current or the alternating voltage output by the ballast is lower than a preset frequency threshold value. In other embodiments, the preset conditions are: the value of the alternating current output by the ballast, the alternating voltage output by the ballast, the direct current output by the rectifier, the direct voltage output by the rectifier or the current flowing through the LED device exceeds the corresponding preset value range.
If the signal does not satisfy the predetermined condition, step 660 is executed to: the dc current from the rectifier is output to the LED device as a drive current.
If the signal satisfies the predetermined condition, step 650 is executed, that is: and converting the direct current from the rectifier into the driving current, wherein the value of the driving current is less than or equal to a preset current threshold value, and the preset current threshold value is less than the maximum current which can be borne by the LED device under the condition of no damage.
In some embodiments, the step of converting the dc current comprises: step 650, comprising: and reducing the direct current output by the rectifier to a value less than or equal to the preset current threshold value. In other embodiments, step 650 includes: and adjusting the driving current to be approximately constant at a value less than or equal to the preset current threshold value.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that many modifications and variations can be made therein. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit and scope of the invention.
Claims (17)
1. A driver for a light emitting diode device for coupling between a ballast and the light emitting diode device and for adapting the light emitting diode device to the ballast, the driver comprising:
A rectifier for coupling with the ballast and for converting an alternating current from the ballast into a direct current;
A current regulator coupled between the rectifier and the light emitting diode device for receiving a direct current from the rectifier and outputting a drive current to the light emitting diode device; and
A detection module for detecting a signal characterizing an output characteristic of the ballast during a start-up phase of the light emitting diode device;
When the signal meets a preset condition, the current regulator is used for converting the direct current from the rectifier into the driving current, the value of the driving current is smaller than or equal to a preset current threshold value, and the preset current threshold value is smaller than the maximum current which can be borne by the light-emitting diode device under the condition of no damage.
2. The driver of claim 1, wherein the light emitting diode device comprises a plurality of light emitting diode chips connected in series with each other, the maximum current being substantially equal to a current rating of the light emitting diode chips.
3. The driver of claim 1, wherein the LED device comprises N groups of LED chips connected in parallel with each other, wherein each group of LED chips comprises a plurality of LED chips connected in series with each other, and the maximum current is substantially equal to N times a rated current of each LED chip, wherein N is a natural number greater than or equal to 2.
4. The driver of claim 1, wherein the current regulator is to output the direct current from the rectifier as the driving current to the light emitting diode device when the signal does not satisfy the preset condition.
5. The driver of claim 1, wherein the signal comprises an alternating current output by the ballast, an alternating voltage output by the ballast, a direct current output by the rectifier, a direct voltage output by the rectifier, a current flowing through the light emitting diode device, or a combination thereof.
6. The driver of claim 5, wherein the ballast output AC current, the ballast output AC voltage, the rectifier output DC current, the rectifier output DC voltage, or the current flowing through the LED device has a corresponding preset value range, and the preset condition is that: the value of the alternating current output by the ballast, the alternating voltage output by the ballast, the direct current output by the rectifier, the direct voltage output by the rectifier or the current flowing through the light emitting diode device exceeds the corresponding preset value range.
7. The driver of claim 5, wherein the preset condition is: the frequency of the alternating current or the alternating voltage output by the ballast is lower than a preset frequency threshold.
8. The driver of claim 1, wherein the current regulator comprises a current sealer to reduce the dc current output by the rectifier to a value less than or equal to the preset current threshold when the signal satisfies the preset condition.
9. The driver of claim 1, wherein the current regulator comprises a constant current control module for regulating the drive current to be substantially constant at a value equal to or less than the preset current threshold when the signal satisfies the preset condition.
10. The driver of claim 1, wherein the detection module comprises:
a sampling circuit for sampling the signal; and
And the judging circuit is used for judging whether the sampled signal meets a preset condition or not and outputting a judgment result signal to the current regulator.
11. A light emitting diode system comprising:
A light emitting diode device; and
A driver for the light emitting diode device for coupling between a ballast and the light emitting diode device and for adapting the light emitting diode device to the ballast, the driver comprising:
A rectifier for coupling with the ballast and for converting an alternating current from the ballast into a direct current,
A current regulator coupled between the rectifier and the light emitting diode device for receiving the direct current from the rectifier and outputting a drive current to the light emitting diode device, an
A detection module for detecting a signal characterizing an output characteristic of the ballast during a start-up phase of the light emitting diode arrangement,
When the signal meets a preset condition, the current regulator is used for converting the direct current from the rectifier into the driving current, the value of the driving current is smaller than or equal to a preset current threshold value, and the preset current threshold value is smaller than the maximum current which can be borne by the light-emitting diode device under the condition of no damage.
12. A method of adapting a light emitting diode device to a ballast, comprising:
Converting alternating current from the ballast into direct current through a rectifier;
Receiving, by a current regulator, a direct current from the rectifier and outputting a driving current to the light emitting diode device;
detecting a signal characterizing an output characteristic of the ballast during a startup phase of the light emitting diode device; and
and when the signal meets a preset condition, converting the direct current from the rectifier into the driving current, wherein the value of the driving current is less than or equal to a preset current threshold value, and the preset current threshold value is less than the maximum current which can be borne by the light-emitting diode device under the condition of no damage.
13. The method of claim 12, comprising: and when the signal does not meet the preset condition, outputting the direct current from the rectifier as the driving current to the light-emitting diode device.
14. The method of claim 12, wherein the signal comprises an alternating current output by the ballast, an alternating voltage output by the ballast, a direct current output by the rectifier, a direct voltage output by the rectifier, a current flowing through the light emitting diode device, or a combination thereof.
15. The method according to claim 14, wherein the preset conditions are: the frequency of the alternating current or the alternating voltage output by the ballast is lower than a preset frequency threshold.
16. The method of claim 12, wherein the step of converting the direct current comprises: and reducing the direct current to a value less than or equal to the preset current threshold value.
17. The method of claim 12, wherein the step of converting the direct current comprises: and adjusting the driving current to be approximately constant at a value less than or equal to the preset current threshold value.
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| WO2021051266A1 (en) * | 2019-09-17 | 2021-03-25 | 卡任特照明解决方案有限公司 | Driver for led device, led system, and adaptation method for led device |
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Address after: Ohio, USA Applicant after: Carent Lighting Solutions Co.,Ltd. Address before: Ohio, USA Applicant before: GE Lighting Solutions, LLC |
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Application publication date: 20191213 |