LED device and lighting device with the same

Abstract

Having a light-emitting diode, LED, device: a first LED string (111; 211; 411; 511; 611; 711; 1011; 1111) which is set up to emit light with a first color temperature; a second LED string (112; 212; 412; 512; 612; 712; 1012; 1112) which is connected in parallel with the first LED string (111; 211; 411; 511; 611; 711; 1011; 1111) and is configured to emit light with a second color temperature different from the first; a smart controller (120; 420; 520; 620; 822; 922; 1020; 1120) containing a controller (122; 422; 522; 622; 824; 924; 1022; 1122) configured to generate a control signal (CTR; CTR2) based on a control command received from an external controller, a circuit (123; 123A; 123B; 123C; 423; 523; 623; 825; 925; 1023; 1123) configured to control the brightness of one or a combination of the first LED string (111; 211; 411; 511; 611; 711; 1011; 1111) and the second LED string (112; 212; 412; 512; 612; 712; 1012; 1112) based on the control signal (CTR; CTR2), and a power supply (121; 421; 521; 621; 823; 923; 1021; 1121) configured to generate an internal power voltage for operation of the controller (122; 422; 522; 622; 824; 924; 1022; 1122) and the circuit (123; 123A; 123B; 123C; 423; 523; 623; 825; 925; 1023; 1123); and Dimming control switches (731) which are connected to nodes between a plurality of first LEDs contained in the first LED string (711) and nodes between a plurality of second LEDs contained in the second LED string (712).

Description

BACKGROUND

[0001] Methods, devices and systems corresponding to exemplary embodiments relate to an LED device and a lighting device containing the same.

[0002] Light-emitting diodes (LEDs) offer advantages such as low power consumption and a relatively long lifespan, and are increasingly replacing fluorescent and incandescent bulbs. Recently, various types of lighting devices using LEDs as light sources have been developed and sold, and research has also been actively conducted on lighting devices that offer functions beyond simple illumination. For example, a lighting device might be equipped with a function to control the color temperature and / or brightness of the light, or to monitor the operating status of the LEDs used as light sources.

[0003] US 2019 / 0 306 949 A1, DE 10 2012 205 349 A1, DE 10 2015 211 454 A1, US 2019 / 0234 567 A1, US 2011 / 0 235 328 A1, US 2018 / 0 159 354 A1 refer to lighting devices. SUMMARY

[0004] One or more exemplary embodiments provide an LED device in which various functions can be provided, while significantly reducing the need for replacement and / or upgrade of components contained in a lighting device, as well as a lighting device containing the same.

[0005] The invention is set out in the accompanying claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The above and other aspects, features and advantages will become clearer from the following description of exemplary embodiments in conjunction with the accompanying drawings, in which: Fig. 1 is a block diagram that schematically shows a lighting device according to an exemplary embodiment; Fig. 2 is a block diagram that schematically shows an LED device according to an exemplary embodiment; Fig. Figures 3 to 6 show an operation of LED devices according to an exemplary embodiment; Fig. 7 is a schematic diagram of an LED device according to an exemplary embodiment; Fig. 8 is a block diagram schematically showing an LED driver included in a lighting device according to an exemplary embodiment; Fig. 9 is a circuit diagram that schematically shows a converter circuit of an LED driver included in a lighting device according to an exemplary embodiment; Fig. 10 is a schematic view showing an LED device according to an exemplary embodiment; Fig. 11 and Fig. The 12 schematic views show lighting devices according to exemplary embodiments. Fig. 13 is a view showing a dimming function of an LED device according to an exemplary embodiment; Fig. 14 and Fig. 15 diagrams are shown, illustrating connection methods between an LED device and an LED driver according to exemplary embodiments; and Fig. 16 and Fig. The 17 schematic views show LED devices according to an exemplary embodiment. DETAILED DESCRIPTION

[0007] The above and other aspects will become clearer from the following description of exemplary embodiments in conjunction with the accompanying drawings, in which: Fig. 1 is a block diagram that schematically shows a lighting device according to an exemplary embodiment.

[0008] On Fig. 1. By reference, a lighting device 10 according to an exemplary embodiment can include an LED driver 20 connected to a power source 1 and an LED device 30. The LED device 30 can be connected to the LED driver 20 via a first driver node 21 and a second driver node 22, and the LED device 30 can be driven by the driver power V output by the LED driver 20. DRV can be operated. The LED driver 20 can, for example, supply an LED current I LED to operate an LED by outputting a constant current.

[0009] The LED driver 20 can be a rectifier circuit that converts the AC power (or alternating current) V output by the power source 1. ACrectifies into a DC power source (or direct current source), a converter circuit that converts the driver power V DRV generated using rectified DC power (or direct current), and includes the like. According to exemplary embodiments, an electromagnetic interference (EMI) filter or similar device can be connected between the power source 1 and the rectifier circuit. The structure and operation of the LED driver 20 are described later.

[0010] The LED device 30 can contain LED strings 31, a smart controller 32, and the like. The LED strings 31 contain a plurality of LEDs that function as a light source, and the plurality of LEDs can be controlled by the driver power V. DRV be switched on.

[0011] The majority of LEDs contained in the LED strings 31 can, for example, form a first LED string and a second LED string. The first LED string can emit light with a first color temperature, and the second LED string can emit light with a second color temperature. The first and second color temperatures can be different from each other. For example, the LEDs contained in the first LED string can emit cool white light, while the LEDs contained in the second LED string emit warm white light. The first and second LED strings can be connected in parallel. Furthermore, the number of LED strings contained in the LED strings 31 is not necessarily limited to two, and the LED strings 31 can contain three or more LED strings.

[0012] The Smart Controller 32 can contain a controller, a circuit, a power supply, and the like. The controller can be connected to an external controller or the like, which generates a predetermined control signal, and the circuit can operate according to the control signal. For example, the circuit can be directly connected to the LED strings 31 and control a plurality of LEDs contained in the LED strings 31 according to a control signal. The power supply can be powered using the driver power V. DRV generate an internal power voltage required for the operation of the controller and the circuit.

[0013] Fig. Figure 2 is a block diagram that schematically shows an LED device according to an exemplary embodiment.

[0014] On Fig. 2. By reference, an LED device 100 according to an exemplary embodiment can include LED strings 110, a smart controller 120, and the like. The LED strings 110 include a first LED string 111 and a second LED string 112, and as described above, the first LED string 111 and the second LED string 112 can be connected in parallel and emit light with different color temperatures.

[0015] The Smart Controller 120 can contain a power supply 121, a controller 122, a circuit 123, and the like. The power supply 121 can be powered using the driver power V. DRV a first internal power voltage V INT1 for the operation of the controller 122 and a second internal power voltage V INT2for the operation of the circuit 123. Depending on exemplary embodiments, the operating voltage of the controller 122 and the operating voltage of the switching module 123 can differ from each other, and the power supply 121 can provide the first internal power voltage V INT1 the controller 122 and the second internal power voltage V INT2 to provide the circuit 123. An example is a first quantity (or a first value or a first strength) of the first internal power voltage (V). INT1 ) different from a second quantity (or second value or second strength) of the second internal power voltage (V) INT2 The first value can be lower than the second value. The power supply 121 can include a first regulator that sets the first internal power voltage V. INT1 generated, and a second regulator that controls the second internal power voltage V INT2 generated.

[0016] The controller 122 can operate by supplying the first internal power voltage V INT1 The controller 122 receives a control signal and can generate a control signal CTR that controls the circuit 123. The control signal CTR can, for example, be a pulse-width modulation (PWM) signal. The controller 122 can adjust the relative duty cycle of the control signal CTR according to a control command received from an external controller.

[0017] According to exemplary embodiments, the controller 122 can be connected to an external controller via a wired or wireless communication link to receive a control command. For example, the controller 122 can include a wireless communication interface and be connected to an external controller via a wireless communication link such as BLUETOOTH™, ZIGBEE™, Wi-Fi, Li-Fi, or infrared communication. Alternatively, the controller 122 can include a wired communication interface and be connected to an external controller via a wired communication link such as Digital Addressable Lighting Interface (DALI) or Digital Multiplex (DMX).The Controller 122 can contain a microcontroller unit (MCU), a communication circuit, an antenna, an oscillator and similar components, and operate by being connected to an external controller via various wired and wireless communication paths.

[0018] The microcontroller unit of the Controller 122 can generate the control signal CTR using a control command received from an external controller via a communication circuit. As described above, the relative on-time of the control signal CTR can vary depending on the control command.

[0019] Circuit 123 can be connected to the first LED string 111 and the second LED string 112. In an exemplary embodiment, circuit 123 can include a switching device connected to the first LED string 111 and / or the second LED string 112, as well as a switch driver that controls the switching on and off of the switching device. Depending on the exemplary embodiment, the number of individual switching devices and switch drivers included in circuit 123 can vary. A detailed configuration of circuit 123 will be described later with reference to the Fig. 3 to 6 described.

[0020] On Fig. 2 Referring to this, the first LED string 111 can be connected between a first LED input node N IN1 and a first LED output node N OUT1 be switched, and the second LED string 112 can be connected between a second LED input node N IN2and a second LED output node N OUT2 be switched on. The first LED input node N IN1 and the second LED input node N IN2 can be interconnected, as in Fig. 2 shown, and can be directly connected via an external LED driver and a first driver node 101. The first LED output node N OUT1 and the second LED output node N OUT2 They can be separate (or isolated) from each other and connected to a second driver node 102 via circuit 123. The switching device contained in circuit 123 can be connected to the first LED output node N. OUT1 and / or the second LED output node N OUT2 be connected.

[0021] By disconnecting the first LED output node N OUT1 and the second LED output node N OUT2 from each other and a connection of the first and the second LED output node N OUT1 and N OUT2The output of the first LED string 111 and / or the second LED string 112 can be individually adjusted using circuit 123. Operation of circuit 123 is described in the following... Fig. 3 to 6 are described in more detail.

[0022] According to an exemplary embodiment, the LED strings 110 and the smart controller 120 can be implemented on a single package substrate. For example, the first LED string 111 and the second LED string 112 can be located on the front of the package substrate, and the power supply 121, the controller 122, the circuit 123, and the like can be located on the back of the package substrate. As described above, by implementing the LED strings 110 and the smart controller 120 on a single package substrate, the LED device 100 can be manufactured in a form compatible with the existing LED module connected to the LED driver.

[0023] However, the exemplary embodiments are not limited to these, and the smart controller 120 can also be implemented separately from the LED strings 110. For example, the first LED string 111 and the second LED string 112 of the LED strings 110 can be implemented with a plurality of LEDs mounted on a predetermined package substrate, and the smart controller 120 can be implemented with ICs and devices mounted on a package substrate separate from the LED strings 110. Accordingly, the smart controller 120 can be provided on a separate module that is separate from the first LED string 111 and the second LED string 112.If the Smart Controller 120 is implemented in a separate package from the LED strings 100, as described above, an antenna or similar component contained within the controller 122 of the Smart Controller 120, which communicates with an external controller, can be positioned in the light emission direction of the LED strings 110. This can improve the wireless communication performance between the external controller and the Smart Controller 120.

[0024] Fig. Figures 3 to 6 are views showing the operation of LED devices according to exemplary embodiments.

[0025] As in Fig. As shown in Figures 3 to 6, LED strings 110 can contain a first LED string 111 and a second LED string 112 connected in parallel. The first LED string 111 can contain the first LEDs LED1, and the second LED string 112 can contain the second LEDs LED2. The first LED string 111 is connected between a first input node N IN1 and a first output node N OUT1 switched, the second LED string 112 is between a second input node N IN2 and a second output node N OUT2 switched, and the first input node N IN1 and the second input node N IN2 can be interconnected. The first input node N IN1 and the second input node N IN2 are connected to the first driver node 101 and can provide a driver performance V DRV received.

[0026] As in Fig. As shown in Figure 3, the circuit 123 can contain a switching device SW and a switch driver SDV. The switching device SW can be connected between the second output node N OUT2 and the second driver node 102 is switched. The SDV switch driver is operated by the CTR control signal, and the CTR control signal can be a PWM signal generated by the controller, as above with reference to Fig. 2 described. For example, the switch driver SDV can control the switching device SW so that it is connected on and off according to the control signal CTR. The circuit 123 can, for example, control the relative on-time of the second LED string 112 according to the control signal CTR. The circuit 123 can, for example, control a color temperature of the light emitted by the LED strings 110 by controlling the relative on-time of the second LED string 112.

[0027] At the in Fig. In the exemplary embodiment shown in Figure 3, control of the first LED string 111 by the circuit 123 is not possible, and only the relative on-time of the control signal CTR supplied to the second LED string 112 can be adjusted by the circuit 123. Therefore, although the control range of the color temperature of the light emitted by the LED strings 110 may not be relatively large, production costs, power consumption, and the like can be reduced because the circuit 123 is configured with only one switching device SW and one switch driver SDV.

[0028] As in Fig. As shown in section 4, a circuit 123A can contain a first switching device SW1, a second switching device SW2, and a switch driver SDV. The first switching device SW1 can be connected between the first output nodes N OUT1and the second driver node 102 of the first LED string 111 is switched, and the second switching device SW2 can be connected between the second output node N OUT2 and the second driver node 102 should be switched on.

[0029] At the in Fig. In the exemplary embodiment shown in Figure 4, the first switching device SW1 can contain a PMOS transistor, and the second switching device SW2 can contain an NMOS transistor. Accordingly, the first LED string 111 and the second LED string 112 can be controlled by a single switching driver SDV. For example, the switching driver SDV can control the first switching device SW1 and the second switching device SW2 to be switched on and off according to the control signal CTR. For example, the first switching device SW1 and the second switching device SW2 can operate in opposite states according to the control signal CTR. For example, the circuit 123A can control the relative on-time of the first LED string 111 and the second LED string 112 according to the control signal CTR.For example, the circuit 123A can control the color temperature of the light emitted by the LED strings 110 by controlling the relative on-time of the first LED string 111 and the second LED string 112. However, since the first switching device SW1 and the second switching device SW2 are connected on and off by the same control signal CTR, it can be difficult to control the first LED string 111 and the second LED string 112 individually, and therefore the color temperature control range of the light emitted by the LED strings 110 may be limited.

[0030] On Fig. 5. Referring to this, an integrated circuit 123B can include a first switching device SW1, a second switching device SW2, a first switch driver SDV1, and a second switch driver SDV2. For example, the first switching device SW1 and the second switching device SW2 can each contain a PMOS transistor or an NMOS transistor. The first switch driver SDV1 can control the first switching device SW1 using a complementary signal of the control signal CTR received from the controller, and the second switch driver SDV2 can control the second switching device SW2 using the control signal CTR. For example, the first switching device SW1 and the second switching device SW2 can operate in opposite states according to the control signal CTR. For example, the integrated circuit 123B can control the relative on-time of the first LED string 111 and the second LED string 112 according to the control signal CTR.For example, the circuit 123A can control the color temperature of the light emitted by the LED strings 110 by controlling the relative on-time of the first LED string 111 and the second LED string 112.

[0031] The processes or functions of the in Fig. 4 and Fig. The 5 circuits shown, 123A and 123B, may be similar to each other. Fig. 5. By reference, if, for example, the relative duty cycle of the control signal CTR is 25%, the first switching device SW1 is controlled by a signal with a relative duty cycle of 75%, while the second switching device SW2 can be controlled by a signal with a relative duty cycle of 25%. Conversely, if the relative duty cycle of the control signal CTR is 75%, the first switching device SW1 is switched on / off by a signal with a relative duty cycle of 25%, while the second switching device SW2 can be switched on / off by a signal with a relative duty cycle of 75%.

[0032] On Fig. 6. Referring to this, a circuit 123C can contain a first switching device SW1, a second switching device SW2, a first switch driver SDV1, and a second switch driver SDV2. In the case of the Fig. In the exemplary embodiment shown in Figure 6, the first switch driver SDV1 and the second switch driver SDV2 can control the switching devices SW1 and SW2 by means of different control signals. The first switch driver SDV1 can control the first switching device SW1 by means of a first control signal CTR1, and the second switch driver SDV2 can control the second switching device SW2 by means of a second control signal CTR2.

[0033] The first control signal CTR1 and the second control signal CTR2 are signals generated by the controller contained in the smart controller along with the 123C circuit. The relative on-time of the first control signal CTR1 and the relative on-time of the second control signal CTR2 can be determined independently. Specifically, the relative on-time of the first control signal CTR1 can be determined independently of the relative on-time of the second control signal CTR2. For example, the 123C circuit can control the relative on-time of the first LED string 111 according to the first control signal CTR1 and control the relative on-time of the second LED string 112 according to the second control signal CTR2.For example, the circuit 123C can control the color temperature of the light emitted by the LED strings 110 by independently controlling the relative on-time of the first LED string 111 and the second LED string 112. Accordingly, compared to those referred to in . Fig. In the exemplary embodiments described in 3 to 5, the control range of the color temperature of the light emitted by the LED strings 110 can be increased, and the brightness of the light emitted by the LED strings 110 can also be adjusted.

[0034] In an exemplary embodiment, the first LED string 111 can emit cool white light, and the second LED string 112 can emit warm white light. It is assumed, by way of example, that the first color temperature of the light emitted by the first LED string 111 is approximately 6000 K, a cool white series, and the second color temperature of the light emitted by the second LED string 112 is approximately 2700 K, a warm white series. Therefore, the color temperature (CCT) of the light emitted by the LED strings 110 can be determined according to the relative on-time of the first control signal CTR1 to determine whether the first switching device SW1 is switched on or off, and the second control signal CTR2 to determine whether the second switching device SW2 is switched on or off, as shown in Table 1. [Table 1] relative Einschaltdauer desersten Steuersignals relative Einschaltdauer deszweiten Steuersignals Farbtemperatur des Lichts 100% 0% 6000K 75% 25% 5175K 50% 50% 4350K 25% 75% 3525K 0% 100% 2700K

[0035] The combination of relative duty cycles of the first control signal CTR1 and the second control signal CTR2 described as an example in Table 1 can also be used in circuits 123A and 123B of the [document / model]. Fig. 4 and Fig. The exemplary embodiments shown in 5 can be implemented. However, as described above, in the case of circuit 123C, according to the [reference to circuit diagram], the following can be implemented: Fig. In the exemplary embodiment shown in Figure 6, the color temperature of the light emitted by the LED strings 110 can be changed to have different values, since the first switching device SW1 and the second switching device SW2 are controlled by the first control signal CTR1 and the second control signal CTR2, which are individually generated by the controller.

[0036] Fig. Figure 7 is a schematic representation of an LED device according to an exemplary embodiment.

[0037] On Fig. 7. By reference, an LED device 200 according to an exemplary embodiment can include LED strings 210, a power supply 220, a controller 230, and an integrated circuit 240. The LED device 200 can be connected to an external LED driver via the first driver node 201 and the second driver node 202. In the Fig. In the exemplary embodiment shown in Figure 7, the configuration of the LED strings 210 and the circuit 240 can be similar to that described with reference to Figure 7. Fig. 6 was described.

[0038] For example, the LED strings 210 can contain a first LED string 211, which contains the first LEDs (LED1) emitting light of a first color temperature, and a second LED string 212, which contains the second LEDs (LED2) emitting light of a second color temperature. The circuit 240 can contain a first switching device SW1 connected to the first LED string 211, a second switching device SW2 connected to the second LED string 212, and switch drivers SDV1 and SDV2. Switching the first switching device SW1 on and off can be controlled by the first switch driver SDV1 according to the first control signal CTR1, and switching the second switching device SW2 on and off can be controlled by the second switch driver SDV2 according to the second control signal CTR2.

[0039] The power supply 220 can contain a first regulator 221 and a second regulator 222. Both the first regulator 221 and the second regulator 222 can contain an input terminal IN, an output terminal OUT, a resistor terminal ADJ connected to resistors, and the like.

[0040] The respective input terminals IN of the first regulator 221 and the second regulator 222 can be connected to a node between a first diode D1 and a first capacitor C1, and the first diode D1 can be connected to a first driver node 201. Accordingly, the driver power V can be DRVThe input terminal IN is supplied. The output terminal OUT can be connected to a second capacitor C2 or a third capacitor C3, which act as output capacitors. Additionally, the first resistor R1 and the second resistor R2 can be connected to the output terminal OUT of the first regulator 221. The junction between the first resistor R1 and the second resistor R2 is connected to the resistor terminal ADJ of the first regulator 221, and the magnitude of the first internal power voltage V is determined by this connection. INT1 The value of the first resistor R1 and / or the second resistor R2 can be determined depending on the resistance value. Similarly, the magnitude of the second internal power voltage V can be determined. INT2 corresponding to a resistance value from a third resistor R3 and / or a fourth resistor R4.

[0041] In an exemplary embodiment, the first internal power voltage is V INT1 one power voltage for operating the controller is 230V, the second internal power voltage is V INT2 is a power voltage for the operation of the circuit 240, and the magnitude of the first internal power voltage V INT1 may be lower than that of the second internal power voltage V INT2 However, the exemplary embodiments are not limited to this, and the respective magnitude of the first internal power voltage V INT1 and the second internal power voltage V INT2 This may vary depending on the exemplary embodiment.

[0042] The 230 controller can generate the first control signal CTR1 and the second control signal CTR2 as PWM signals. The first control signal CTR1 can be fed to the first switch driver SDV1 to control the first switching device SW1, and the second control signal CTR2 can be fed to the second switch driver SDV2 to control the second switching device SW2. In the Fig. In the exemplary embodiment shown in Figure 7, the switching on / off of the first switching device SW1 and the switching on / off of the second switching device SW2 are controlled independently of each other by the first control signal CTR1 and the second control signal CTR2, respectively, and the color temperature and / or the brightness of the light emitted by the LED strings 210 can be adjusted in various ways.

[0043] The Controller 230 can be connected to the external Controller 250 via various wired / wireless communication methods. For example, the external Controller 250 can be a mobile device such as a smartphone or tablet PC, or a lighting controller permanently installed in a room near the LED Device 200.

[0044] The user can check the status of the LED driver, which powers the LED device 200 with a driver power of V DRVThe LED device 200 supplies power and monitors the status of the LED strings 210 contained within the LED device 200 using the external controller 250. For example, if a fault occurs in at least one of the first LEDs (LED1), the voltage applied to the entire first LED string 211 may change. The LED device 200 monitors the voltage and current of the respective LED strings 211 and 212 to monitor whether LEDs LED1 and LED2 fail, as well as the power consumption.

[0045] The power consumption of the LED driver, which powers the LED device 200 with a driver power V DRVThe power supplied is determined by a maximum rated voltage and current of the LED driver and may be described in the LED driver specifications. However, if the forward voltage of the LEDs (LED1 and LED2) contained in the LED strings 210 is relatively low within the rated voltage range of the LED driver, a difference may occur between the power consumption described in the LED driver specifications and the power actually consumed by the LED strings 210. In an exemplary embodiment, the LED device 200 may include a voltage / current sensing circuit connected to the LED strings 210. Because of the voltage / current sensing circuit, the controller 230 can calculate the actual power consumption of the LED strings 210 and transmit the calculated power consumption to the external controller 250 to notify the user.

[0046] Furthermore, according to one exemplary embodiment, the LED device 200 can detect whether flickering occurs in the LED strings 210. As described above, the LED device 200 can include a voltage / current sensing circuit that detects the voltage / current of the LED strings 210 and transmits the detected voltage / current to the controller 230. In this case, the controller 230 can use a ripple component contained in the current detected by the LED strings 210 to determine whether flickering occurs and transmit the result of the detection to the external controller 250. Alternatively, a separate optical sensor for detecting the light emitted by the LED strings 210 can be added to the LED device 200, and the controller 230 can calculate an accurate flicker index using an output from the optical sensor.The flicker index is determined as a value between 0 and 1 and can have a higher value (i.e. closer to 1) as the flicker intensity increases.

[0047] Fig. Figure 8 is a block diagram schematically showing an LED driver included in a lighting device according to an exemplary embodiment.

[0048] On Fig. 8. By reference, an LED driver 300 according to an exemplary embodiment can include an EMI filter 310, a rectifier circuit 320, a converter circuit 330, and the like. The EMI filter 310 can dissipate AC power V. AC received and can be used in AC power V AC The rectifier circuit 320 can filter the AC power V filtered by the EMI filter 310. AC convert it into DC power. In an exemplary embodiment, the rectifier circuit 320 can include a diode bridge.

[0049] The converter circuit 330 supplies a plurality of LEDs with the driver power V. DRV and can be configured in various ways according to exemplary embodiments. For example, the converter circuit 330 can include a power factor correction converter (PFC converter) that improves the power factor and increases the voltage, as well as a DC-DC converter. The converter circuit 330 can provide a driver power V DRV to operate the majority of LEDs by generating a rectified power V REC used, which is generated by the rectifier circuit 320 converting the AC power V AC rectifies. The voltage level of the driver power V DRVThe current can be determined by the characteristics of a plurality of LEDs connected to the output terminal of the converter circuit 330, e.g., by the forward voltage of each of the LEDs or similar. In an exemplary embodiment, the LED driver 300 can supply an LED current I LED to operate the LED by outputting a constant current.

[0050] Fig. Figure 9 is a circuit diagram that schematically shows a converter circuit of an LED driver included in a lighting device according to an exemplary embodiment.

[0051] The in Fig. The converter circuit shown in Figure 9 could, for example, be the converter circuit 330, which is used in the LED driver 300 in the Fig. The exemplary embodiment shown in section 8 is included. Fig. 9. Referring to this, the converter circuit 330 can include a PFC converter 331, a DC-DC converter 332, a controller 333, and the like. The PFC converter 331 can operate as a boost converter circuit, which rectifies the voltage V. REC increased, and may include a first inductor L1, a first diode D1, a first capacitor C1, a first converter switch Q1 and the like.

[0052] When the first converter switch Q1 is turned on by the controller 333, a current flows through the rectified power V. REC to a switching resistor RS, which charges the first inductor L1 with energy. Conversely, when the controller 333 switches off the first converter switch Q1, the current charged in the first inductor L1 can be discharged, generating a voltage greater than the rectified voltage V. REC, which is fed to the PFC converter 331. In this case, a high-frequency component can be removed by the first capacitor C1, which is connected to the first diode D1.

[0053] The DC-DC converter 332, connected in series with the PFC converter 331, can operate as a buck converter circuit and includes a second inductor L2, a second diode D2, a second capacitor C2, and a second converter switch Q2. Similar to the first converter switch Q1, the second converter switch Q2 can also be controlled by the controller 333.

[0054] When the controller 333 switches on the second converter switch Q2, the second inductor L2 can be charged with energy while current flows to the second inductor L2. Conversely, when the controller 333 switches off the second converter switch Q2, a current flows through the energy stored in the second inductor L2, and the driver power V DRVcan be output. The second diode D2 provides a path through which current can flow when the second converter switch Q2 is disconnected, and the second capacitor C2 can act as a rectifier capacitor.

[0055] The LED current I LED The current output by the LED driver 300 to the majority of LEDs via the converter circuit 330 can be a fixed value. Furthermore, the LED driver 300 can have a nominal voltage within a predefined range, and the power consumption of the LED driver 300 can be limited by a maximum value for the nominal voltage and the LED current I. LED can be determined. The LED current I LED The nominal voltage and power consumption of the LED driver 300 can be provided as specifications of the LED driver 300.

[0056] In a case where the sum of the forward voltages of the majority of LEDs corresponds to a middle or lower part of the rated voltage range due to reasons such as the failure of at least some of the majority of LEDs connected to the LED driver 300, the power consumption of the majority of LEDs connected as a load to the LED driver 300 may be reduced. Accordingly, there may be a difference between the power consumption described in the specifications of the LED driver 300 and the power actually consumed by the LED driver 300 during operation.

[0057] In one exemplary embodiment, the above problem can be avoided by using a smart controller integrated into the LED device along with a plurality of LEDs connected to the LED driver 300. The smart controller can monitor the actual power consumed by the LED driver 300 by sensing the voltage applied to the plurality of LEDs and the current flowing through them. For example, if it is detected that a relatively low voltage is applied to one of the LED strings comprising the plurality of LEDs, it can be determined that some of the LEDs in that string have failed. The LED driver 300 can generate a signal indicating the failure of that portion of the LEDs. Accordingly, the condition of the LED strings connected to the LED driver 300, as well as the power consumption of the LED driver 300 itself, can be monitored.

[0058] As described above, the Smart Controller can be connected to an external controller via a wired or wireless communication link. The external controller can be a device such as a smartphone or similar device and can receive a notification that part of the LEDs has failed, for example, via a wireless message from the LED Driver 300. Therefore, the user can check the status of the LED Driver 300 and the LED strings using an application on the external controller that is paired with the Smart Controller.

[0059] Fig. Figure 10 is a schematic view showing an LED device according to an exemplary embodiment.

[0060] As in Fig. As shown in Figure 10, an LED device 400 according to an exemplary embodiment can comprise a master device 400A and a plurality of slave devices 400B and 400C. The master device 400A can comprise LED strings 410 and a smart controller 420. The smart controller 420 comprises a power supply 421, a controller 422, an integrated circuit 423, and the like, and the operation of the respective components can be similar to that shown above with reference to Fig. 2 described exemplary embodiment. The controller 422 can be communicatively connected to an external controller, such as a smartphone, a tablet PC, a remote control, a lighting control device, and the like.

[0061] The LED device 400 according to the in Fig. In the exemplary embodiment shown in Figure 10, the plurality of slave devices 400B and 400C can furthermore be connected to the master device 400A. In an exemplary embodiment, each of the plurality of slave devices 400B and 400C can contain only a plurality of LEDs. Fig. 10. With reference to this, the first slave device 400B can contain a first LED string 403 and a second LED string 404, and the second slave device 400C can contain a first LED string 406 and a second LED string 407. Specifically, the smart controller 420 cannot be included in every one of the majority of slave devices 400B and 400C.

[0062] The first LED strings 403, 406, and 411, contained in the master device 400A and the majority of slave devices 400B and 400C, can be connected in series, and the second LED strings 404, 407, and 412 can also be connected in series. Accordingly, the brightness of the first LED strings 403, 406, and 411 can be adjusted simultaneously, and the brightness of the second LED strings 404, 407, and 412 can be adjusted simultaneously, since the switching devices in the circuit 423 are connected and disconnected according to a predetermined relative duty cycle by the control signal CTR output by the controller 422 of the smart controller 420. In this way, a plurality of devices 400A, 400B and 400C, each containing a plurality of LEDs, can be controlled simultaneously by the Smart Controller 420, which is provided in only one of the devices, the master device 400A.

[0063] Fig. 11 and Fig. Figure 12 are views that schematically show lighting devices according to exemplary embodiments.

[0064] Fig. 11 and Fig. Figure 12 are diagrams illustrating lighting devices 500 and 600 that provide a dimming function. As shown in Fig. As shown in Figure 11, the lighting device can contain 500 LED strings (510), a smart controller (520), an LED driver (530), and the like. The LED driver (530) can supply an AC power V AC received and a driver power V DRV generate. According to exemplary embodiments, the LED strings 510 and the smart controller 520 can be contained in a single package and form an LED device, and the first LED string 511 and the second LED string 512 of the LED strings 510 can be driven by the driver power V DRVThe LED strings 510 and the smart controller 520 are connected to the LED driver 530 via the first driver node 501 and the second driver node 502 and can be combined in one package to form an LED device.

[0065] At the in Fig. In the exemplary embodiment shown in Figure 11, the smart controller 520 can include a power supply 521, a controller 522, an integrated circuit 523, a dimming controller 524, and the like. The power supply 521 provides a first internal power voltage V INT1 , a second internal power voltage V INT2 and a third internal power voltage V INT3 off, and the 522 controller can be powered by the first internal power voltage V INT1 be operated, and the 523 circuit can be powered by the second internal power voltage V INT2The controller 522 outputs a control signal CTR for controlling the circuit 523 and a dimming control signal CTR. DIM for controlling the dimming controller 524, and in an exemplary embodiment, the control signal CTR and the dimming control signal CTR can be DIM These are PWM signals. Detailed processes and functions of the power supply 521, the controller 522, and the circuit 523 can be understood with reference to the exemplary embodiments described above. The controller 522 can be communicatively connected to an external controller, such as a smartphone, a tablet PC, a remote control, a lighting control device, and so on.

[0066] The 524 dimming controller operates via the third internal power voltage V INT3 and can provide a dimming control voltage according to the dimming control signal CTR DIM generate. In the Fig. In the exemplary embodiment shown in Figure 11, the LED driver 530 can provide a dimming function and therefore include dimming control terminals DIM+ and DIM-, as shown in Figure 11. Fig. Shown in 11. The 524 dimming controller can operate according to the dimming control signal CTR. DIM Output the generated dimming control voltage to the dimming control terminals DIM+ and DIM-.

[0067] The dimming control signal CTR DIM This could be, for example, a PWM signal, and the 524 dimming controller can adjust the level of the dimming control voltage according to the relative duty cycle of the dimming control signal (CTR). DIM Determine. Assuming that the dimming control voltage that outputs the maximum brightness is, for example, 3 V, the dimming control voltage can be 1.5 V if the relative on-time of the dimming control signal CTR is DIM 50%. Additionally, the dimming control voltage can be 0.9 V if the relative duty cycle of the dimming control signal is CTR. DIM30%, and 2.4 V, when the relative duty cycle of the dimming control signal CTR DIM 80%. The magnitude of the LED current I output by the LED driver 530 LED The dimming control voltage is changed depending on its size, thus allowing the brightness of the light emitted by the 510 LED strings to be adjusted.

[0068] Next up Fig. 12. By reference, an LED device 600 can contain LED strings 610, a smart controller 620, an LED driver 630, and the like. The smart controller 620 can contain a power supply 621, a controller 622, a circuit 623, a dimming controller 624, and the like. The controller 622 can be communicatively connected to an external controller, such as a smartphone, a tablet PC, a remote control, a lighting control device, and so on. The controller can receive a control command from the external controller.

[0069] In contrast to the one in Fig. In the exemplary embodiment shown in 11, the LED driver 630 represents the Fig. The exemplary embodiment shown in 12 does not provide a dimming function and cannot include a dimming control connection. Accordingly, as described in reference to Fig. 11 described, the dimming function is not designed in such a way that the dimming controller 624 determines the magnitude of the dimming control voltage according to the relative on-time of the dimming control signal CTR. DIM certainly.

[0070] To implement the dimming function when connected to the LED driver 630, which does not provide a dimming function, the dimming controller 624 can be connected to the first LED string 611 and the second LED string 612 of the LED strings 610. For example, the dimming controller 624 can determine the number of LEDs actually emitting light in the first LED string 611 and in the second LED string 612 according to the relative on-time of the dimming control signal CTR. DIM adjust. Accordingly, the following can be done in Fig. 12 shown exemplary embodiment, although the magnitude of the LED current I output by the LED driver 630 is LED The intensity of the light emitted by the LED strings 610 does not change, which is described below with reference to Fig. 13 is described in more detail.

[0071] Fig. Figure 13 is a view showing the dimming function of the LED device according to an exemplary embodiment.

[0072] Fig. Figure 13 shows the operation or functionality of a dimming controller contained in an LED device connected to an LED driver that does not provide a dimming function. Fig. 13. By reference, an LED device 700 can contain LED strings 710, a circuit 720, a dimming controller 730, and the like. The circuit 720 can control the switching on and off of the first switching device SW1 and the second switching device SW2 by means of the first and second control signals CTR1 and CTR2 transmitted by the controller.

[0073] The dimming controller 730 contains a switching unit 731 and a switch control circuit 732, and the switching unit 731 can contain a plurality of dimming control switches DSW1-DSW3. The plurality of dimming control switches DSW1-DSW3 can be connected to the first LED string 711 and the second LED string 712. As shown in Fig. As shown in Figure 13, each of the plurality of dimming control switches DSW1-DSW3 can be connected to a node between the first LEDs LED1 and a node between the second LEDs LED2.

[0074] The switch control circuit 732 can switch the majority of dimming control switches DSW1-DSW3 on / off according to the dimming control signal CTR transmitted by the controller. DIM control. The dimming control signal CTR DIM This can be, for example, a PWM signal, and the 732 switch control circuit can control any of the majority of dimming control switches DSW1-DSW3 according to the relative on-time of the dimming control signal CTR. DIM to switch on or off. For example, if the relative on-time of the dimming control signal CTR DIMIf the duty cycle of the dimming control signal is 50%, the 732 switch control circuit can turn on the second dimming control switch DSW2 and turn off the first and third dimming control switches DSW1 and DSW3. Similarly, if the relative duty cycle of the dimming control signal is CTR, the 732 controller can DIM If the relative duty cycle of the dimming control signal CTR is 25%, the first dimming control switch DSW1 is switched on and the second and third dimming control switches DSW2 and DSW3 are switched off. In an exemplary embodiment, if the relative duty cycle of the dimming control signal CTR DIM If the relative duty cycle of the dimming control signal CTR is greater than 25% and less than 50%, the majority of dimming control switches DSW1 - DSW3 are connected in or out in the same way as if the relative duty cycle of the dimming control signal CTR DIM 50%.

[0075] At the in Fig. In the exemplary embodiment shown in Figure 13, a dimming function can be implemented even if the LED driver does not have dimming control terminals. If only one of the multiple dimming control switches DSW1-DSW3 is switched on, the current supplied to the LED strings 710 cannot flow through the circuit 720. Therefore, when the dimming function is activated, the color temperature of the light emitted by the LED strings 710 cannot be adjusted.

[0076] Fig. 14 and Fig. Figure 15 shows diagrams illustrating connection methods between an LED device and an LED driver according to exemplary embodiments.

[0077] Fig. Figure 14 is a diagram showing a connection method between an LED driver 810, which provides a dimming function, and an LED device 820. Fig. 14. Referring to this, the LED driver 810 can be connected to an input cable 811 and an output cable 815. The input cable 811 can contain a plurality of input terminals 812-814 that receive AC power, and the output cable 815 can contain a plurality of output terminals 816-819 that transmit the driver power generated by the LED driver to the LEDs. Among the plurality of output terminals, a first output terminal 816 and a second output terminal 817 can be terminals for outputting the driver power. The voltage output at the first terminal 816 can, for example, be greater than the voltage output at the second terminal 817.

[0078] The LED driver 810 can generate the driving power using the AC power received via the input cable 812. The LED driver 810 can include an EMI filter, a rectifier circuit, a converter circuit, a controller, and the like. The rectifier circuit converts AC power to DC power, and the converter circuit can generate driving power using DC power. Depending on the application of the lighting device 800, the LED driver 810 can be water- and dust-proof. In one exemplary embodiment, the LED driver 810 can be sealed with a sealing element that prevents the ingress of moisture and dust.

[0079] In an exemplary embodiment, the LED driver 810 can output a constant current to operate the LEDs connected to the output cable 815, and the magnitude of the constant current can be determined by the controller.

[0080] The controller can provide a dimming function that allows the magnitude of the constant current output by the 810 LED driver to be adjusted within a rated current range. The controller can adjust the magnitude of the constant current according to the dimming control signal input via the DIM+ and DIM- terminals.

[0081] On Fig. 14. Referring to this, the LED device 820 can include LED strings 821 and a smart controller 822, and the smart controller 822 can include a power supply 823, a controller 824, a circuit 825, a dimming controller 826, and the like. The controller 824 can be communicatively connected to an external controller, such as a smartphone, a tablet PC, a remote control, a lighting control device, and so on. When the controller 824 receives a control command to change the brightness of the light emitted by the LED strings 821 from an external controller via wired or wireless communication links, the controller 824 can convert the control command into a dimming control signal, which is a PWM signal, and transmit the converted signal to the dimming controller 826.The 826 dimming controller can determine a dimming control voltage based on the relative on-time of the dimming control signal and output this voltage to the DIM+ and DIM- dimming control terminals. Depending on the magnitude of the dimming control voltage received via the DIM+ and DIM- terminals, the constant current output by the 810 LED driver can increase or decrease.

[0082] Fig. Figure 15 is a diagram showing a connection method between an LED driver 910, which does not provide a dimming function, and an LED device 920. Fig. 15. Referring to this, the LED driver 910 can be connected to an input cable 911 and an output cable 915. The input cable 911 can contain a plurality of input terminals 912-914 that receive AC power, and the output cable 915 can contain a plurality of output terminals 916 and 917 for transmitting the driver power generated by the LED driver to the LEDs. Similar to the LED device 820 of Fig. 14 indicates the LED device 920 from Fig. Figure 15 shows a smart controller 922, which includes a power supply 923, a controller 924, a circuit 925, and a dimming controller 926. The controller 924 can be communicatively connected to an external controller, such as a smartphone, a tablet PC, a remote control, a lighting control device, and so on.

[0083] At the in Fig. In the exemplary embodiment shown in Figure 15, the LED driver 910 does not provide a dimming function, and therefore no separate dimming control connection is provided in the LED driver 910. Accordingly, the dimming controller 926 of the LED device 920, as shown in Figure 15, contains a dimming control connection for the LED device 920. Fig. In the exemplary embodiment shown in Figure 15, dimming control switches are connected to a node between the LEDs of the LED strings 921, and the dimming function can be implemented such that the number of LEDs actually emitting light is changed by switching the individual dimming control switches on or off. The dimming function can, for example, be implemented in the same way as in Figure 15. Fig. 13 is described.

[0084] Fig. 16 and Fig. Figure 17 are schematic views showing an LED device according to an exemplary embodiment.

[0085] According to the in the Fig. 16 and Fig. The exemplary embodiments shown in Figure 17 can include LED devices 1000 and 1100 and thermoelectric circuits 1030 and 1130. The thermoelectric circuits 1030 and 1130 each contain a thermoelectric element for converting heat into electrical energy. Fig. 16. By reference, the LED device can include 1000 LED strings 1010, a smart controller 1020, and the thermoelectric circuit 1030. The smart controller 1020 can include a power supply 1021, a controller 1022, and a circuit 1023. The controller 1022 can be communicatively connected to an external controller, such as a smartphone, a tablet PC, a remote control, a lighting control device, and so on. The thermoelectric circuit 1030 contains a thermoelectric element and is connected to the LED strings 1010 to convert the heat generated during the operation of the LED strings 1010 into electrical energy. In an exemplary embodiment, the thermoelectric element can be a device that utilizes the Seebeck effect, in which electrical energy is generated by a temperature difference between different metals or semiconductors.

[0086] Immediately after the LED strings 1010 in the LED device 1000 begin to emit light, almost no heat can be generated in the LED strings 1010. Accordingly, in the initial phase of operation of the LED device 1000, as described above, the power supply 1021 can maintain the internal power voltages V INT1 and V INT2 using the driver power V DRV generate. If the temperature of the LED strings 1010 rises after a certain time and electrical energy is generated in the thermoelectric circuit 1030, the electrical energy of the thermoelectric module 1030 can be supplied to the power supply 1021.

[0087] The power source 1021 can, for example, contain a capacitor that is charged with the electrical energy supplied by the thermoelectric circuit 1030. When the capacitor is charged, the internal power voltages V can be INT1 and V INT2The capacitor generates the power required to operate the controller 1022 and the circuit 1023. Accordingly, the controller 1022 and the circuit 1023 can be operated based on the power provided by the capacitor, and the smart controller 1020 can be operated in a state where the influence on the LED driver, which is connected to the LED device 1000 via the driver nodes 1001 and 1002, is significantly reduced.

[0088] Next, the Smart Controller 1120 can be used in the Fig. The exemplary embodiment shown in Figure 17 includes a battery 1124. The battery 1124 can, for example, include a lithium-ion battery, a charging circuit, and the like.

[0089] When the LED device 1100 is operated for the first time, the battery 1124 may be in a discharged state. Accordingly, the power source 1121 may not be able to supply the internal power voltages V. INT1and V INT2 using the driver power V DRV generates the LED driver connected via driver nodes 1101 and 1102.

[0090] If a predetermined time elapses after the operation of the LED strings 1110, the thermoelectric circuit 1130 releases electrical energy due to the heat generated by the LED strings 1110, and the battery 1124 can be charged with this energy. If the charge level of the battery 1124 exceeds a predetermined threshold, the power supply 1121 can supply the internal power voltages V INT1 and V INT2 generate by increasing the output power of battery 1124 and not the driver power V DRVused. Accordingly, the controller 1122 and the circuit 1123 can operate based on the power supplied by the battery 1124, and the influence of the smart controller 1120 on the LED driver, which is connected to the LED device 1100 via the driver nodes 1101 and 1102, can be significantly reduced. The controller 1122 can be communicatively connected to an external controller, such as a smartphone, a tablet PC, a remote control, a lighting control device, and so on.

[0091] As outlined above, exemplary embodiments allow the implementation of functions such as communication with an external controller, monitoring of the operating status, and adjustment of brightness and / or color temperature simply by replacing a light source containing an LED, without replacing or upgrading an existing LED driver or similar component in the lighting device. Therefore, a lighting device can be implemented that significantly enhances user comfort while substantially reducing waste from previously installed equipment.

Claims

[1] Having a light-emitting diode, LED, device: a first LED string (111; 211; 411; 511; 611; 711; 1011; 1111) which is set up to emit light with a first color temperature; a second LED string (112; 212; 412; 512; 612; 712; 1012; 1112) which is connected in parallel with the first LED string (111; 211; 411; 511; 611; 711; 1011; 1111) and is configured to emit light with a second color temperature different from the first; a smart controller (120; 420; 520; 620; 822; 922; 1020; 1120) containing a controller (122; 422; 522; 622; 824; 924; 1022; 1122) configured to generate a control signal (CTR; CTR2) based on a control command received from an external controller, a circuit (123; 123A; 123B; 123C; 423; 523; 623; 825; 925; 1023; 1123) configured to control the brightness of one or a combination of the first LED string (111; 211; 411; 511; 611; 711; 1011; 1111) and the second LED string (112; 212; 412; 512; 612; 712; 1012; 1112) based on the control signal (CTR; CTR2), and a power supply (121; 421; 521; 621; 823; 923; 1021; 1121) configured to generate an internal power voltage for operation of the controller (122; 422; 522; 622; 824; 924; 1022; 1122) and the circuit (123; 123A; 123B; 123C; 423; 523; 623; 825; 925; 1023; 1123); and Dimming control switches (731) which are connected to nodes between a plurality of first LEDs contained in the first LED string (711) and nodes between a plurality of second LEDs contained in the second LED string (712). [2] LED device according to claim 1, wherein the circuit (123; 123A; 123B; 123C) comprises a switch (SW; SW2) connected in series with the second LED string (112) and a switch driver (SDV; SDV2) configured to control the switch based on the control signal (CTR; CTR2). [3] LED device according to claim 1, wherein the circuit (123A) comprises a first switch (SW1) connected in series with the first LED string (111), a second switch (SW2) connected in series with the second LED string (112), and a switch driver (SDV) configured to control the first switch (SW1) and the second switch (SW2) based on the control signal (CTR). [4] LED device according to claim 3, wherein the switch driver (SDV) is configured to control the first switch (SW1) based on a PWM signal and to control the second switch (SW2) based on the PWM signal. [5] LED device according to claim 3, wherein the switch driver (SDV) is configured to provide a first PWM signal to the first switch (SW1), to provide a second PWM signal to the second switch (SW2), and wherein a first phase of the first PWM signal is opposite to a second phase of the second PWM signal. [6] LED device according to claim 3, wherein the switch driver (SDV) is configured to provide a first PWM signal to the first switch (SW1), to provide a second PWM signal to the second switch (SW2), and wherein the first PWM signal is different from the second PWM signal. [7] LED device according to any one of claims 1 to 6, wherein the controller (122; 422; 522; 622; 824; 924; 1022; 1122) is configured to provide the external controller with information indicating the states of the first LED string (111; 211; 411; 511; 611; 711: 1011; 1111) and the second LED string (112; 212; 412; 512; 612; 712: 1012; 1112). [8] LED device according to any one of claims 1 to 7, wherein the power supply has a first regulator configured to provide a first internal power voltage (V INT1 ) to generate for the operation of the controller (122), and has a second regulator configured to generate a second internal power voltage (V INT2 ) to generate for the operation of the circuit (123), wherein a first magnitude of the first internal power voltage (V INT1 ) from a second quantity of the second internal power voltage (V INT2 ) is different. [9] LED device according to claim 8, wherein the first size is smaller than the second size. [10] LED device according to any one of claims 1 to 9, wherein the smart controller (120; 420; 520; 620; 822; 922; 1020; 1120) is provided on a single module that is separated from the first LED string (111; 211; 411; 511; 611; 711: 1011; 1111) and the second LED string (112; 212; 412; 512; 612; 712: 1012; 1112). [11] LED device according to any one of claims 1 to 10, wherein the first LED string (111; 211; 411; 511; 611; 711; 1011; 1111) is connected between a first input node (N IN1 ) and a first output node (N OUT1 ) is switched, and the second LED string (112; 212; 412; 512; 612; 712; 1012; 1112) is connected between a second input node (N IN2 ) and a second output node (N OUT2 ) is switched, and where the first input node (N IN1 ) and the second input node (N IN2) are electrically connected to each other, and the first output node (N OUT1 ) from the second output node (N OUT2 ) is isolated. [12] LED device according to any one of claims 1 to 11, further comprising: a dimming controller (732) configured to control the dimming control switches (731) according to a relative on-time of a PWM signal generated by the controller based on the control command. [13] Lighting device comprising: an LED driver (20; 300; 530; 630; 810; 910) configured to generate driver power using alternating current (AC) power and to output the driver power via a first driver node (101; 401; 501; 601; 701; 1001; 1101) and a second driver node (102; 402; 502; 602; 702; 1002; 1102); a plurality of LED strings (31; 110; 410; 510; 610; 710; 821; 921; 1010; 1110) which have a first LED string (111; 411; 511; 611; 711; 1011; 1111) that is between the first driver nodes (101; 401; 501; 601; 701; 1001; 1101) and a first LED output node (N OUT1 ) is switched, and a second LED string (112; 412; 512; 612; 712; 1012; 1112) which is connected between the first driver nodes (101; 401; 501; 601; 701; 1001; 1101) and a second LED output node (N OUT2 ) is switched, wherein the first LED string (111; 411; 511; 611; 711; 1011; 1111) is configured to emit light with a first color temperature, and wherein the second LED string (112; 412; 512; 612; 712; 1012; 1112) is configured to emit light with a second color temperature; a smart controller (32; 120; 420; 520; 620; 822; 922; 1020; 1120) connected to the first driver node (101; 401; 501; 601; 701; 1001; 1101), the second driver node (102; 402; 502; 602; 702; 1002; 1102), the first LED output node (N OUT1 ) and the second LED output node (N OUT2 ), between the LED driver (20; 300; 530; 630; 810; 910) and the majority of LED strings (31; 410; 510; 610; 710; 821; 921; 1010; 1110), wherein the smart controller (32; 120; 420; 520; 620; 822; 922; 1020; 1120) has a circuit (123; 123A; 123B; 123C; 423; 523; 623; 720; 825; 925; 1023; 1123) which is connected to the first LED output node (N OUT1 ), the second LED output node (N OUT2) and the second driver node (102; 402; 502; 602; 702; 1002; 1102) and is configured to set the brightness of one or a combination of the first LED string (111; 411; 511; 611; 711; 1011; 1111) and the second LED string (112; 412; 512; 612; 712; 1012; 1112); and Dimming control switches (731) which are connected to nodes between a plurality of first LEDs contained in the first LED string (711) and nodes between a plurality of second LEDs contained in the second LED string (712). [14] Lighting device according to claim 13, wherein the LED driver (300) comprises a rectifier circuit (320) configured to rectify the AC power and a converter circuit (330) configured to generate the driver power using an output of the rectifier circuit (320). [15] Lighting device according to claim 13 or 14, wherein the first LED string (111; 411; 511; 611; 711; 1011; 1111) is configured to emit white light with the first color temperature, and the second LED string (112; 412; 512; 612; 712; 1012; 1112) is configured to emit white light with the second color temperature, and wherein the second color temperature is higher than the first color temperature. [16] Lighting device according to one of claims 13 to 15, further comprising a thermoelectric circuit (1030) attached to the plurality of LED strings (1010) and comprising a thermoelectric element configured to convert heat emitted by the plurality of LED strings (1010) into electrical energy. [17] Lighting device according to claim 16, wherein the smart controller (1020) further comprises a power supply (1021) which is connected to the first driver node (1001) and an output node of the thermoelectric circuit (1030) and is configured to generate an internal power voltage for at least one component of the controller (1022) using the driver power and the output power of the thermoelectric circuit (1030). [18] Lighting device according to claim 16, wherein the smart controller (1120) further comprises a battery (1124) connected to an output node of the thermoelectric circuit (1130) and a power supply (1121) configured to generate an internal power voltage using the output power of the battery (1124).

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