TW201028045A - Light emitting apparatus - Google Patents

Light emitting apparatus Download PDF

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Publication number
TW201028045A
TW201028045A TW98100789A TW98100789A TW201028045A TW 201028045 A TW201028045 A TW 201028045A TW 98100789 A TW98100789 A TW 98100789A TW 98100789 A TW98100789 A TW 98100789A TW 201028045 A TW201028045 A TW 201028045A
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TW
Taiwan
Prior art keywords
circuit
signal
illuminating
electrically
variable frequency
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Application number
TW98100789A
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Chinese (zh)
Inventor
Shao-Wei Chiu
Shi-Ming Chen
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Chi Mei Lighting Tech Corp
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Application filed by Chi Mei Lighting Tech Corp filed Critical Chi Mei Lighting Tech Corp
Priority to TW98100789A priority Critical patent/TW201028045A/en
Publication of TW201028045A publication Critical patent/TW201028045A/en

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Abstract

A light emitting apparatus includes plural light emitting diode (LED) modules and a variable-frequency control converter. The variable-frequency control converter is electrically connected to the LED modules and outputs a driving signal to drive the LED modules. The variable-frequency control converter includes a variable-frequency circuit, a switch driving circuit and a power conversion circuit. The variable-frequency circuit is electrically connected to the switch driving circuit, and the switch driving circuit is electrically connected to the power conversion circuit. The variable-frequency driving circuit outputs a variable-frequency signal according to plural feedback signals of the LED modules. The switch driving circuit outputs a switch-driving signal according to the variable-frequency signal. The power conversion circuit outputs the driving signal, which provides the substantially fixed current to each LED module, according to the switch-driving signal and a direct current (DC) signal.

Description

201028045 VI. Description of the Invention: [Technical Field] The present invention relates to a light-emitting device, and more particularly to a light-emitting device having a light-emitting diode. [Prior Art] Light Emitting Diode (LED) has low power consumption, long service life, high safety, short response time and small size, and has 10 times longer life than fluorescent tubes. And its luminous efficiency continues to increase. Therefore, in recent years, light-emitting diodes have been widely used in displays, indicator lights, and various electronic products. Figure 1 is a schematic illustration of a conventional LED lighting device. As shown in FIG. 1, the AC power supply Vs is supplied by the mains to sequentially output a certain current IC0N through an electromagnetic interference filtering circuit (EMI) circuit C, a power factor correction circuit C2 and a conversion circuit C3 to drive the plurality of LEDs. Group Lin — L0N, where current ICON is a fixed value and ICON = I! + I2 Η-----h ΙΝ. Since the LED lighting device uses the three-stage circuits C1 to C3 to drive the light-emitting diode modules Lfn_LoN, the power is consumed three times to reduce the use efficiency. In addition, if some of the light-emitting diode modules are damaged or removed due to the life-span, the current Icon will be evenly distributed to the remaining light-emitting diode modules so as to flow through the remaining light-emitting diode modules. The current becomes large, so that the luminance of each of the light-emitting diode modules becomes large and unstable, and even burns due to excessive current. Therefore, how to provide a light device capable of stabilizing current, voltage or power to avoid unstable or even burned light of the light-emitting diode is one of the current important topics. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a light-emitting device capable of stabilizing current, voltage or power. To achieve the above object, a light-emitting device according to the present invention comprises a plurality of light-emitting diode modules and a variable-frequency control converter. The variable frequency control converter 电 is electrically connected to the light emitting diode modules and generates a driving signal to drive the light emitting diode modules. The variable frequency control converter comprises a frequency conversion circuit, a switch drive circuit and an energy conversion circuit. The frequency conversion circuit is electrically connected to the switch drive circuit, the switch drive circuit is electrically connected to the energy conversion circuit, and the frequency conversion circuit outputs a frequency conversion signal according to the plurality of feedback signals of the light emitting diode modules, and the switch drive circuit is based on the frequency conversion The signal outputs a switch driving signal, and the energy conversion circuit is based on the switch driving signal and the _ a DC signal output driving signal to make the current enthalpy of each LED module a constant value. To achieve the above object, a light-emitting device according to the present invention comprises a plurality of light-emitting diode modules and a variable-frequency control converter. The variable frequency control converter is electrically connected to the light emitting diode modules and generates a driving signal to drive the light emitting diode modules. The variable frequency control converter comprises a frequency conversion circuit, a switch drive circuit and an energy conversion circuit. The frequency conversion circuit is electrically connected to the switch drive circuit, the switch drive circuit is electrically connected to the energy conversion circuit, and the frequency conversion circuit outputs a variable frequency signal according to the driving signal, and the driving circuit is driven according to the variable frequency signal to output a driving switch signal. The energy conversion circuit converts the voltage of each of the LED modules to a constant value according to the driving switch signal and the DC signal output driving signal. To achieve the above object, a light-emitting device according to the present invention comprises a plurality of light-emitting diode modules and a variable-frequency control converter. The variable frequency control converter is electrically connected to the light emitting diode modules and generates a driving signal to drive the light emitting diode modules. The variable frequency control converter comprises a frequency conversion circuit, a switch drive circuit and an energy conversion circuit. The frequency conversion circuit is electrically connected to the switch drive circuit, and the switch drive circuit is electrically connected to the energy conversion circuit, and the frequency conversion circuit outputs a frequency conversion signal according to the plurality of feedback machine numbers and driving signals of the light emitting diode modules, and the switch drive The circuit is based on the variable frequency signal output 'moving_signal' and the energy conversion circuit is based on the driving switch signal and the -dc signal output driving signal so that the power of each of the light emitting diode modules is substantially constant. Lu includes a frequency conversion circuit, an illumination device i of the invention, a variable frequency control converter, a switch drive circuit and an energy conversion circuit. change

In addition, the present invention can adjust the output due to the feedback of the feedback signal and/or the driving signal, so that the brightness of the remaining LEDs 6 201028045 module is stable without burning. [Embodiment] Hereinafter, a light-emitting device according to a preferred embodiment of the present invention will be described with reference to the related drawings. First Embodiment Referring to Fig. 2, Fig. 2 is a schematic view showing a light-emitting device 1 according to a first embodiment of the present invention. The light-emitting device 1 includes a plurality of light-emitting diode modules • Ln to L1N and a variable-frequency control converter 10. Each of the LED modules may include a plurality of LEDs connected in series and/or in parallel, and the inverter control converters 10 are electrically connected to the LED modules Ln L L1N, respectively, and generate one. The driving signal 11 drives the LED modules Ln to L1N. The variable frequency control converter 10 can generate the driving signal 11 according to the DC power source or the AC power source. In the embodiment, the AC power source is taken as an example. The variable frequency control converter 10 includes a frequency conversion circuit 1 and a switch drive circuit 102 and an energy conversion circuit 103, and the frequency conversion circuit 101 is electrically connected to the switch drive circuit 102, and the switch drive circuit 102 and the energy conversion circuit 103 are electrically connected. connection. The frequency conversion circuit 101 outputs a variable frequency signal 依据 according to the plurality of feedback signals 12 of the LEDs L1 to L1N, and the switch driving circuit 102 outputs a switching driving signal 14 according to the frequency conversion signal 13, and the energy conversion circuit The 103 system outputs the driving signal 11 according to the switch driving signal 14 and the constant current signal 17, so that the current for driving each of the LED modules Ln to L1N is substantially stabilized at a constant value. 7 201028045 Second Embodiment As shown in Fig. 3, Fig. 3 is a schematic view of a light-emitting device 2 according to a second embodiment of the present invention, which is applied to the structure of the light-emitting device 1. The illuminating device 2 includes a variable frequency control converter 2 复 and a plurality of illuminating diode modules. Groups Lu and La, and the variable frequency control converter 2 电 is electrically connected to the LED modules LZ1 and La and outputs A driving signal 21 drives the light-emitting one-pole modules Lai, La. In this embodiment, two sets of light-emitting diodes, the mold group 1 and La, are taken as an example, and the light-emitting diode modules [^ and [n each include two sets of three parallel-connected light-emitting diodes and one resistor. And a diode, the purpose of the package and the one pole are respectively to obtain the voltage and current limiting effect of the feedback signal 22. The variable frequency control converter 20 includes a frequency conversion circuit 201, a switch drive circuit 202, and an energy conversion circuit 203. The frequency conversion circuit 201 is electrically connected to the switch drive circuit 202, and the switch drive circuit 202 is electrically connected to the energy conversion circuit 203. In the present embodiment, the energy conversion circuit 203 is exemplified as a flyback converter circuit. The flyback converter circuit has the characteristics of low cost, mature circuit and simple structure, and each of them easily achieves the purpose of multiple sets of outputs, and its circuit architecture is a down converter (Buck_B〇〇st Converter) with isolation characteristics. In this embodiment, the system is applied to energy conversion and voltage reduction to drive the LED modules -L2! and L22. The flyback converter circuit is a conventional technique, and the detailed operation thereof will not be described herein. Referring to FIG. 3, the variable frequency control converter 20 further includes a comparison circuit 204 electrically connected to the LED module & b and the inverter circuit 2〇1 8 201028045. The comparison circuit 204 outputs a comparison signal 232 according to the LED module and the feedback signal 22 and a reference voltage νπ. 2 In this embodiment, the comparison circuit 2〇4 is, for example, a product having a comparator. Integrated circuit (1C). Taking the above drive as an example, the operation mode is. If the voltage of the feedback signal 22 is greater than the reference voltage, the output is at a high level, and if the input voltage is less than the reference voltage, the output is at a low level (for example, a ground level). The purpose is to make the output comparison signal 23 have a high or low level operating power. In the present embodiment, the comparison signal 23 is input to the frequency conversion circuit 2〇1, and after the action of the frequency conversion circuit 201, the frequency conversion signal 24 is generated, that is, the frequency of the frequency conversion signal 24 can be different at different times. It should be noted that the voltage of the comparison signal 23 has a corresponding relationship with the frequency of the frequency conversion signal 24, for example, a linear or nonlinear variation relationship, wherein the nonlinear variation relationship is, for example, exponentially changed. Fig. 4 is a schematic diagram of the inverter circuit 201, wherein the V2 is a reference voltage and VD is an operating voltage. In Fig. 4, the voltage of the input signal is proportional to the frequency of the output signal, that is, after the modulation of the circuit, the voltage of the comparison signal 23 and the frequency of the frequency conversion signal 24 are proportionally changed. As shown in FIG. 3, the variable frequency control converter 20 further includes a main power factor correction circuit 205, which is electrically connected to the comparison circuit 204 and the switch drive circuit 202, and generates a power factor according to the comparison signal 23. The correction signal 26 is input to the switch drive circuit 202. In the present embodiment, the active power factor correction circuit 205, the frequency conversion circuit 201, and the switch drive circuit 202 can be a product of 2010. The power factor correction signal 26 output by the active power factor correction circuit 205 can have a constant level of the low level of the pulse signal of the switch driving signal 25, thereby increasing the power factor to 0.9 or more, even Close to the extent of 1. The frequency conversion signal 24 outputted by the frequency conversion circuit 201 has the characteristics of frequency conversion and the power output of the active power factor correction circuit 205 can be used to correct the signal 26 to achieve high power characteristics, so that the switch driving circuit 202 outputs the switching drive signal 25 to drive energy conversion. The transistor 203 of the circuit 203 is turned on and off, and the current of the driving signal 21 outputted by the energy conversion circuit 203 is controlled. In addition, as shown in FIG. 3, the variable frequency control converter 20 further includes an EMI filter circuit 206 and a rectifier circuit 207, and the rectifier circuit 207 and the electromagnetic interference filter circuit 206 and the energy conversion circuit 203 are electrically connected. The DC signal 27 is connected and output to the energy conversion circuit 203. The electromagnetic interference filter circuit 206 is a low-pass filter, which bypasses the high-frequency noise contained in the input AC signal, and only passes the signal of a specific ❹ frequency (for example, 60 Hz) to avoid interference with the frequency conversion control conversion. The action of the device 20. The rectifying circuit 207 is, for example, a full-wave rectifying circuit that rectifies the alternating current signal of the electromagnetic interference filtering circuit 206 and filters the chopping component by the filtering capacitor to output the direct current signal 27. Third Embodiment - Referring to Fig. 5, Fig. 5 is a schematic view showing a light-emitting device 3 according to a third embodiment of the present invention, which is an architecture of a light-emitting device 1. The illuminating device 3 includes a variable frequency control converter 30 and a plurality of illuminating diode modules L31 and L32, and the variable frequency control converter 30 is electrically connected to the LED illuminating diodes 201028045 group L31 and L32 and outputs a driving. The signal 31 drives the LED modules L31 and L32. In this embodiment, two sets of LED modules L31 and L32 are taken as an example, and the LED modules L31 and L32 respectively comprise two sets of three LEDs connected in parallel, one resistor and one second. The pole body, the purpose of the resistor and the diode are respectively to obtain the voltage and current limiting action of the feedback signal 32. The variable frequency control converter 30 includes a frequency conversion circuit 301, a switch drive circuit 302 and an energy conversion circuit 303, and the frequency conversion circuit 301 is electrically connected to the open/close drive circuit 302, and the switch drive circuit 302 and the energy conversion circuit 303 are electrically connected. connection. The variable frequency control converter 30 further includes a comparison circuit 304 electrically connected to the light emitting diode modules L31 and L32 and the frequency conversion circuit 301. The comparison circuit 304 is based on the feedback signal 32 of the LED modules L31 and L32 and a reference voltage V3R to output a comparison signal 33. In addition, as shown in FIG. 5, the variable frequency control converter 30 further includes an electromagnetic interference filter circuit 306, a rectifier circuit 307, and a passive power factor correction circuit 305, and the rectifier circuit 307 and the electromagnetic interference filter circuit 306 and The passive power factor correction circuit 305 is electrically connected, and the passive power factor correction circuit 305 is electrically connected to the rectifier circuit 307 and the energy conversion circuit 303, and outputs a DC signal 37. - The function of the passive power factor correction circuit 305 is to adjust the waveform of the signal output from the rectifier circuit 307 so that the voltage waveform in the light-emitting device 3 is more consistent with the phase of the current waveform, thereby improving the power factor. The variable frequency control converter 30 of the third embodiment is different from the technical feature of the 1128028045 variable frequency control converter 20 of the second embodiment in that the variable frequency control converter 20 of the second embodiment includes an active power factor correction circuit. 205, while the variable frequency control converter 30 of the third embodiment includes a passive power factor correction circuit 305 for the purpose of improving the power factor and improving the circuit characteristics of the light emitting device. For the rest of the technical features and the manner of operation, reference may be made to the first embodiment, and details are not described herein again. As described above, the input signal of the alternating current is input to the variable frequency control converter 20 of the second embodiment or the variable frequency control converter 30 of the third embodiment, via the electromagnetic interference filter circuit 206 or 306 and the rectifier circuit 207 or 307. After the filter rectification, whether the active power factor correction circuit 205 or the passive power factor correction circuit 305 is used, the input of the switch driving circuit 502 or 602 uses the feedback signal 22 or the light emitting diode of the self-luminous diode modules L21 and L22. The feedback signal 32 of the body module L31 & L32 is controlled and modulated, and by the operation of the frequency conversion circuit 201 or 301, the switch driving signal 25 or 35 outputted by the switch driving circuit 202 or 302 has the characteristics of frequency conversion, thereby controlling The transistor T2 or T3 of the φ energy conversion circuit 203 or 303 is turned on and off, and the current of the driving signal 21 or 31 outputted by the energy conversion circuit 203 or 303 is adjusted by turning on and off the transistor D or Τ3 to drive the current. The current of each of the light-emitting diode modules L21 and L22 or L3 1 and L32 is kept constant. In addition, the variable frequency control converter 20 or 30 also increases the power factor of the illuminating device to reduce losses due to the use of the power factor correction circuit. When a certain group of LED modules is damaged or removed, the present invention can adjust the current of the driving signal 21 or 31 outputted by the energy conversion circuit 203 or 303 by changing the feedback signal 22 or 32, so as to drive the remaining LEDs. Pole 12 201028045 The current of the body module is kept at a certain value, so that the brightness of the light is kept stable and does not burn. Fourth Embodiment Referring to Fig. 6, Fig. 6 is a schematic view showing a light-emitting device 4 according to a fourth embodiment of the present invention. The light-emitting device 4 includes a plurality of light-emitting diode modules L41 to L4N and a variable-frequency control converter 40. Each of the LED modules may include a plurality of LEDs connected in series, in parallel, or in series and in parallel, and the inverter control converters 40 are electrically connected to the LED modules L41 to L4N, respectively. A driving signal 41 is generated to drive the LED modules L41 to L4N. The variable frequency control converter 40 includes a frequency conversion circuit 401, a switch drive circuit 402 and an energy conversion circuit 403, and the frequency conversion circuit 401 is electrically connected to the switch drive circuit 402, and the switch drive circuit 402 is electrically connected to the energy conversion circuit 403. The variable frequency circuit 401 outputs a variable frequency signal 43 according to the driving signal 41. The switch driving circuit 402 outputs a switching driving signal 44 according to the frequency conversion signal 43. The energy conversion circuit 403 outputs the driving signal according to the switching driving signal 44 and the constant current signal 47. 41, the voltage for driving each of the light-emitting diode modules L41 to L4N is substantially stabilized at a constant value. Fifth Embodiment Referring to Fig. 7, Fig. 7 is a schematic view showing a light-emitting device 5 according to a fifth embodiment of the present invention, which is applied to the structure of the light-emitting device 4. The illuminating device 5 includes a variable frequency control converter 50 and a plurality of illuminating diode modules L51 and L52, and the variable frequency control converter 50 is electrically connected to the LED dies 13 201028045 group L51 and L52 and outputs one. The driving signal 51 drives the LED modules L51 and L52. In this embodiment, two sets of light-emitting diode modules L51 & L52 are taken as an example, and the light-emitting diode modules L51 and L52 each comprise two sets of three serially connected light-emitting diodes and a resistor. The variable frequency control converter 50 includes a frequency conversion circuit 501, a switch drive circuit 502 and an energy conversion circuit 503, and the frequency conversion circuit 501 is electrically connected to the switch drive circuit 502, and the switch drive circuit 502 is electrically connected to the energy conversion circuit 503. Referring to FIG. 7, the variable frequency control converter 50 further includes a comparison circuit 504 and is electrically connected to the energy conversion circuit 503 and the frequency conversion circuit 501. The comparison circuit 504 outputs a comparison signal 53 according to one of the voltage division signal 58 and the reference voltage V5R generated by the driving signal 51. In this embodiment, the voltage dividing signal 58 is a voltage division caused by the driving signal 51 via the resistors R51 and R52, that is, the voltage of the voltage dividing signal 58 is equal to the voltage of the driving signal 51 multiplied by the resistor R52, and divided by the resistor (R51 + R52). The variable frequency control converter 50 further includes an active power factor correction circuit 505 electrically connected to the comparison circuit 504 and the switch drive circuit 502, and generates a power factor correction signal 56 according to the comparison signal 53 and input to the switch drive circuit 502. . In addition, as shown in FIG. 7, the variable frequency control converter 50 further includes an electromagnetic interference filter circuit 506 and a rectifier circuit 507, and the rectifier circuit 507 is electrically connected to the electromagnetic interference filter circuit 506 and the energy conversion circuit 503. And output a DC signal 57. The technical characteristics of the variable frequency control converter 50 of the fifth embodiment and the 1428028045 variable frequency control converter 20 of the second embodiment are mainly different in that the feedback signal 22 of the second embodiment is based on each of the light emitting diode modules. L21 and L22 are derived, and the voltage dividing signal 58 of the fifth embodiment is divided by the driving signal 51 through a resistor, and both are respectively input to the comparator. For the remaining technical features and operation modes of the illuminating device 5, reference may be made to the second embodiment, which will not be described again. Sixth Embodiment Referring to FIG. 8, FIG. 8 is a schematic view of a light-emitting device 6 according to a sixth embodiment of the present invention, which is applied to the structure of the light-emitting device 4. The illuminating device 6 includes a variable frequency control converter 60 and a plurality of LED modules L61 and L62, and the variable frequency control converter 60 is electrically connected to the LED modules L61 and L62 and outputs a driving signal. 61 to drive the LED modules L61, L62. In this embodiment, two sets of LED modules L61 and L62 are taken as an example, and the LED modules L61 and L62 each include two sets of three LEDs connected in series and one resistor. The variable frequency control converter 60 includes a frequency conversion circuit 601, a switch drive circuit 602 and an energy conversion circuit 603, and the frequency conversion circuit 601 is electrically connected to the switch drive circuit 602, and the switch drive circuit 602 is electrically connected to the energy conversion circuit 603. . The variable frequency control converter 60 further includes a comparison circuit 604 electrically connected to the light-emitting diode modules L61 and L62 and the frequency conversion circuit 601. The comparison circuit 604 outputs a comparison signal 63 according to a voltage division signal 68 and a reference voltage V6R generated after the driving signal 61 is divided. In this embodiment, the voltage dividing signal 68 is a partial voltage of the driving signal 61 caused by the resistors R61 and R62 15 201028045, that is, the voltage of the voltage dividing signal 68 is equal to the voltage of the driving signal 61 multiplied by the resistor R62, and divided by the resistor ( R61 + R62). In addition, as shown in FIG. 8 , the variable frequency control converter 60 further includes an electromagnetic interference filter circuit 606 , a rectifier circuit 607 and a passive power factor correction circuit 605 , and the rectifier circuit 607 and the electromagnetic interference filter circuit 606 and the passive power The correction circuit 605 is electrically connected, and the passive power factor correction circuit 605 is electrically connected to the rectifier circuit 607 and the energy conversion circuit 603, and outputs a DC signal 67. The function of the passive power factor correction circuit 605 is to adjust the phase of the rectified signal outputted by the rectifying circuit 607 so that the voltage waveform of the illuminating device 6 and the phase of the current waveform are relatively uniform. The technical characteristics of the variable frequency control converter 60 of the sixth embodiment are different from those of the variable frequency control converter 50 of the fifth embodiment in that the variable frequency control converter 50 of the fifth embodiment includes an active power factor correction circuit 505. The variable frequency control converter 60 of the sixth embodiment includes a passive power factor φ correction circuit 605, the purpose of which is to improve the power factor and improve the circuit characteristics of the light emitting device. For the remaining technical features and actuation modes of the illuminating device 6, reference may be made to the fifth embodiment, and details are not described herein again. As described above, the input signal of the alternating current is input to the inverter type control converter 50 of the fifth embodiment or the variable frequency control converter 60 of the sixth embodiment, via the electromagnetic interference filter circuit 506 or 606 and the rectifier circuit 507 or 607. After the filter rectification, whether the active power factor correction circuit 505 or the passive power factor correction circuit 605 is used, the input of the switch drive circuit 502 or 602 is divided by a self-drive signal 51 or 61 to generate a voltage division signal. 58 or 16 201028045 68 for control and modulation, and by the operation of the frequency conversion circuit 501 or 601, the switch drive signal 55 or 65 outputted by the switch drive circuit 502 or 602 has the characteristics of frequency conversion, thereby controlling the energy conversion circuit 503 or The transistor T5 or T6 of 603 is turned on and off, and the voltage of the driving signal 51 or 61 outputted by the energy conversion circuit 503 or 603 is adjusted by turning on and off the transistor T5 or T6 to drive the LED modules. The voltages of L51 and L52 or l61 and l62 are kept at a certain value. In addition, the variable frequency control converter also increases the power factor of the illuminating device by using the power factor correction circuit to reduce the loss. When a certain group of LED modules is damaged or removed, the present invention can adjust the voltage of the driving signal 51 or 61 output by the energy conversion circuit 503 or 603 through the change of the voltage dividing signal 58 or 68, so as to drive the remaining lights. The voltage of the diode module is kept constant, so that the brightness of the light is kept stable without burning. Seventh Embodiment @ Please refer to Fig. 9, which is a schematic view of a light-emitting device 7 according to a seventh embodiment of the present invention. The light-emitting device 7 includes a plurality of light-emitting diode modules L71 to L7N and a variable-frequency control converter 70. Each of the LED modules may include a plurality of LEDs connected in series, or in parallel, or in series and in parallel, and the inverter control converter 70 is electrically connected to the LED module - L71 to L7N, respectively. Connected, and a driving signal 71 is generated to drive the LED modules L71 to L7N. The variable frequency control converter 70 includes a frequency conversion circuit 701, a switch drive circuit 702 and an energy conversion circuit 703, and the frequency conversion circuit 701 is electrically connected to the switch 17 201028045 drive circuit 702, and the switch drive circuit 702 is electrically connected to the energy conversion circuit 703. . The variable frequency circuit 701 outputs a variable frequency signal 73 according to the plurality of feedback signals 72 and the driving signal 71 of the light emitting diode module, and the switch driving circuit 702 outputs a switching driving signal 74 according to the frequency conversion signal 73, and the energy conversion circuit 703 The driving signal 71 is outputted according to the switch driving signal 74 and the constant current signal 77, so that the power for driving the LED modules L71 to L7N is substantially stabilized at a constant value. Eighth Embodiment ® Referring to Fig. 10, Fig. 10 is a schematic view showing a light-emitting device 8 according to an eighth embodiment of the present invention, which is a structure in which the light-emitting device 7 is applied. The illuminating device 8 includes a variable frequency control converter 80 and a plurality of LED modules L81 and L82, and the variable frequency control converter 80 is electrically connected to the LED modules L81 and L82 and outputs a driving signal. 81 is used to drive the LED modules L81 and L82. In this embodiment, two sets of LED modules Lsi and Lg2 are taken as an example, and the LED modules Lgi and L82 each comprise φ 2 sets of 3 series connected LEDs, a resistor and a second. The polar body, and the purpose of the resistor and the diode are respectively to obtain the feedback signal 82 and the current limiting effect. The variable frequency control converter 80 includes a frequency conversion circuit 801, a switching drive circuit 802 and an energy conversion circuit 803, and the frequency conversion circuit 801 is electrically connected to the switch drive circuit 802, and the switch drive circuit 802 and the energy conversion circuit 803 are electrically connected. connection. Referring to FIG. 10, the variable frequency control converter 80 further includes a comparison circuit 804 electrically connected to the LED modules L81 and L82, the energy conversion circuit 18 201028045, and the frequency conversion circuit 801. The comparison circuit 804 outputs a comparison signal 83 according to the voltage division signal 88 generated by the driving signal 81, the feedback signal 82 of the LED modules L81 and L82, and a reference voltage V8R. In this embodiment, the voltage dividing signal 88 is the voltage division caused by the driving signal 81 through the resistors R81 and 82. That is, the voltage of the voltage dividing signal 88 is equal to the voltage of the driving signal 81 multiplied by the resistor R82, and divided by the resistor ( R81 + R82). In the present embodiment, the comparison circuit 804 includes, for example, a comparator 809 and a multiplier 808 (or an adder). The voltage dividing signal 88 and the feedback signal о 82 are first input to the multiplier 808 for multiplication. Since the power is equal to the voltage multiplied by the current, the output is compared to the input of the comparator 809, and compared with the reference voltage V8R, the output power is compared. Signal 83. The variable frequency control converter 80 further includes an active power factor correction circuit 805, which is electrically connected to the comparison circuit 804 and the switch drive circuit 802, and generates a power factor correction signal 86 according to the comparison signal 83 and inputs the switch drive circuit 802. In addition, as shown in FIG. 10, the variable frequency control converter 80 further includes an electromagnetic interference filter circuit 806 and a rectifier circuit 807, and the rectifier circuit 807 is electrically connected to the electromagnetic interference filter circuit 806 and the energy conversion circuit 803, and The output DC signal 87 is output. The technical characteristics of the variable frequency control converter 80 of the eighth embodiment and the variable frequency control converter 20 of the second embodiment are mainly different in that the feedback signal 22 of the second embodiment is based on each of the light emitting diode modules. L21 and L22 are derived, and the input of the comparator 809 of the eighth embodiment is the output of the multiplier 808, and the input of the multiplier 808 is 19, 201028045, the voltage dividing signal 88 from the driving signal 81, and each of the light emitting diodes. The feedback signal 82 of the modules L81 and L82. For the remaining technical features and operation modes of the illuminating device 8, reference may be made to the second embodiment and the fifth embodiment, and details are not described herein again. Ninth Embodiment Referring to Fig. 11, Fig. 11 is a schematic view showing a light-emitting device 9 according to a ninth embodiment of the present invention. The illuminating device 9 includes a variable frequency control converter 90 and a plurality of LED modules L91 and L92, and the variable frequency control converter 90 is electrically connected to the LED modules L91 and L92 and outputs a reference drive. The signal 91 drives the LED modules L91 and L92. In this embodiment, two sets of LED modules L91 and L92 are taken as an example, and the LED modules L91 & L92 each comprise two sets of three LEDs connected in series, one resistor and one pole. The purpose of the resistor and the diode is to obtain the feedback signal 92 and the current limiting effect, respectively. The variable frequency control converter 90 includes a frequency conversion circuit 901, a switch drive circuit 902 and an energy conversion circuit 903, and the frequency conversion circuit 901 is electrically connected to the open φ off drive circuit 902, and the switch drive circuit 902 and the energy conversion circuit 903 are electrically connected. connection. Referring to FIG. 11, the variable frequency control converter 80 further includes a comparison circuit 904 electrically connected to the LED modules L91 and L92, the energy conversion electric circuit 903 and the frequency conversion circuit 901. The comparison circuit 904 outputs a comparison signal 93 according to one of the voltage division signal 98 generated by the driving signal 91, the feedback signal 92 of the LED modules L91 and L92, and a reference voltage V9R. In this embodiment, the voltage dividing signal 98 is the voltage division caused by the driving signal 91 via the resistors R9i and R92, that is, the voltage of the voltage dividing signal 98 is equal to the voltage of the driving 20 201028045 signal 91 multiplied by the resistor R92, and divided by the resistor ( R91 + R92 ). In addition, as shown in FIG. 11 , the variable frequency control converter 90 further includes an electromagnetic interference filter circuit 906 , a rectifier circuit 907 , and a passive power factor correction circuit 905 , and the rectifier circuit 907 and the electromagnetic interference filter circuit 906 and the passive power The correction circuit 905 is electrically connected, and the passive power factor correction circuit 905 is electrically connected to the rectifier circuit 907 and the energy conversion circuit 903, and outputs a DC signal 97. The function of the passive power factor correction circuit 905 is to adjust the waveform of the signal output by the rectifier circuit 907 so that the voltage waveform in the light-emitting device 9 is more consistent with the phase of the current waveform, thereby improving the power factor. The technical characteristics of the variable frequency control converter 90 of the ninth embodiment and the variable frequency control converter 80 of the eighth embodiment are mainly different in that the variable frequency control converter 80 of the eighth embodiment includes an active power factor correction circuit 805. The variable frequency control converter 90 of the ninth embodiment includes a passive power factor correction circuit 905, the purpose of which is to improve the power factor and improve the circuit characteristics of the light-emitting device φ. For the remaining technical features and operation modes of the illuminating device 9, reference may be made to the eighth embodiment, and thus no further details are provided herein. As described above, the input signal of the alternating current is input to the variable frequency control converter 80 of the eighth embodiment or the variable frequency control converter 90 of the ninth embodiment via the electromagnetic interference filter circuit 806 or 906 and the rectifier circuit 807 or 907. After the filter rectification, whether the active power factor correction circuit 805 or the passive power factor correction circuit 905 is used, the input of the switch drive circuit 802 or 902 uses a voltage division signal 88 or 98 generated by the self-drive signal 81 or 91 and emits light. The feedback signal 82 of the diodes L81 and L82 or the feedback signal 92 of the LEDs L91 and L92 21 201028045 are first subjected to multiplication and then controlled and modulated, so that the switch drive signal of the switch drive circuit 802 or 902 is output 85. Or 95 has the characteristics of frequency conversion, thereby controlling the conduction and cutoff of the transistor D or A of the energy conversion circuit 803 or 903, and turning on and off by the transistor or the A to adjust the energy conversion circuit to hide the 9 9G3 The driving signal Μ • or the power of 91 'saves the power of each of the LED modules L81 and L82 or l91 and l92 to be constant. Further, the eighth embodiment and the nuisance control converter of the ninth embodiment also increase the power factor of the light-emitting device to reduce the loss by using the power factor correction circuit. When a certain group of LED modules is damaged or removed, the present invention can adjust the energy conversion circuit 803 < 9G3 output driving signal 81 or by changing the signal 88 or 98 and the feedback signal 82 or 92. The power of 91 'saves the power of driving the remaining LED modules to a certain value, so that the 7C of the light is kept stable without burning. In summary, the illuminating device of the present invention has a variable frequency control converter including a frequency conversion circuit, a switch driving circuit and an energy conversion circuit. The variable frequency circuit can output an output-frequency signal according to a plurality of feedback signals and/or driving signals of the LED module, and the switch driving circuit outputs a switch driving signal according to the frequency conversion signal. The switch driving signal is adjusted according to the feedback signal and/or the driving signal, and the driving signal output by the energy conversion circuit according to the switching driving signal is also adjusted, so that the current, voltage or power input to each LED module is input. The substance is fixed. Therefore, if some of the light-emitting diode modules are damaged or removed, the present invention can adjust the output by feedback and frequency conversion due to changes in the feedback signal and/or the driving signal, so that the remaining light-emitting diodes 22 201028045 module emit brightness. Stay stable without burning. In addition, the energy conversion circuit and the active power factor correction circuit of the present invention are combined into a single-stage circuit, and the electromagnetic interference filter circuit, the rectifier circuit and the passive power factor correction circuit are combined into a single-stage circuit, compared with the conventional LED illumination device. The invention saves the circuit of the first level, so as to reduce the power loss, thereby improving the power use efficiency. The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional LED light-emitting device; FIG. 2 is a schematic view of a light-emitting device according to a first embodiment of the present invention; FIG. 3 is a schematic view of a light-emitting device according to a second embodiment of the present invention; 4 is a schematic diagram of a frequency conversion circuit according to a preferred embodiment of the present invention; FIG. 5 is a schematic diagram of a light-emitting device according to a third embodiment of the present invention; FIG. 6 is a schematic diagram of a light-emitting device according to a fourth embodiment of the present invention; 7 is a schematic view of a light-emitting device according to a fifth embodiment of the present invention; FIG. 8 is a schematic view showing a light-emitting device according to a sixth embodiment of the present invention; FIG. 9 is a schematic view showing a light-emitting device according to a seventh embodiment of the present invention; 10 is a schematic view of a light-emitting device according to an eighth embodiment of the present invention; and FIG. 11 is a schematic view of a light-emitting device according to a ninth embodiment of the present invention. 23 201028045 [Explanation of main component symbols] I, 2, 3, 4, 5, 6, 7, 8, 9: Illumination devices 10, 20, 30, 40, 50, 60, 70, 80, 90: Variable frequency control conversion 101, 201, 301, 401, 501, 601, 701, 801, 901: frequency conversion circuits 102, 202, 302, 402, 502, 602, 702, 802, 902: switch drive circuits 103, 203, 303, 403 , 503, 603, 703, 803, 903: energy conversion circuits II, 21, 31, 41, 51, 61, 71, 81, 91: drive signals 12, 22, 32, 72, 82, 92: feedback signal 13, 24, 34, 43, 54, 64, 73, 84, 94 ··Frequency signals 14, 25, 35, 44, 55, 65, 74, 85, 95: switch drive signals 17, 27, 37, 47, 57, 67, 77, 87, 97: DC signals φ 204, 304, 504, 604, 804, 904: comparison circuits 205, 505, 805: active power factor correction circuits 206, 306, 506, 606, 806, 906, C1: Electromagnetic interference filter circuits 207, 307, 507, 607, 807, 907: rectifier circuits 23, 33, 53, 63, 83, 93: comparison signals 26, 56, 86: power factor correction signals 305, 605, 905: passive power Correction circuit 58, 68, 88 98: voltage division signal 808, 908: multiplier 24 201028045 809, 909: comparator C2: power factor correction circuit C3: conversion circuit, 1, In, Icon: current L01 ~ Lon, Ln ~ L1N, L21 ~ L22, L31 to L32, L4i to L4n, L51 to L52, L61 to L> 62, L71 to L7N, Lgi to Lg2, L91 to L92, LED module R5I, R52, ruler 61, Κ·62, R81, ruler 82, R9I, R92: resistance - τ2, τ3, τ5, τ6, τ8, τ9: transistor

Vl, V2, V2R, V3R, V5R, V6R, VgR, V9R: reference check voltage vD: working voltage Vs: AC power supply

25

Claims (1)

  1. 201028045 VII. The scope of the patent application: 1. A light-emitting device comprising: a plurality of light-emitting diode modules; and a variable-frequency control converter electrically connected to the light-emitting diode modules and generating a Driving the signal to drive the LED modules, and the 5H conversion control converter comprises a frequency conversion circuit, a switch driving circuit and an energy conversion circuit, and the frequency conversion circuit is electrically connected to the switch driving circuit, The switch drive circuit is electrically connected to the energy conversion circuit, and the variable frequency circuit outputs a variable frequency signal according to the plurality of feedback signals of the light emitting diode modules, and the switch driving circuit outputs a switch driving signal according to the variable frequency signal. And the energy conversion circuit outputs the driving signal according to the SYS switch driving signal and the DC signal to make the current of each of the LED modules substantially constant. 2. The illuminating device of claim 2, wherein each of the illuminating diode modules comprises a plurality of illuminating diodes connected in series and/or in parallel. 3. The illuminating device of claim 2, wherein the variable frequency control converter further comprises a comparison circuit, and the comparison circuit is electrically connected to the illuminating diode module and the frequency conversion circuit, And outputting a comparison signal according to the feedback signals and a reference voltage. 4. The illuminating device of claim 3, wherein the voltage of the comparison signal has a corresponding relationship with the frequency of the frequency conversion signal. 5. The illuminating device of claim 3, wherein the variable frequency control converter further comprises an active power factor correcting circuit electrically connected to the comparing circuit 26201028045 and the switch driving circuit, and according to the comparison The signal is generated to generate a power factor correction signal input to the switch drive circuit. 6. The illuminating device of claim 1, wherein the energy conversion circuit is a return-to-late converter circuit. 7. The illuminating device of claim 1, wherein the energy conversion circuit is configured to step down the DC signal. 8. The illuminating device of claim 1, wherein the variable frequency control converter further comprises an electromagnetic interference filtering circuit and a rectifying electric circuit, and the rectifying circuit and the electromagnetic interference filtering circuit and the energy conversion The circuit is electrically connected and outputs the DC signal. 9. The illuminating device of claim 8, wherein the rectifying circuit is a full wave rectifying circuit. 10. The illuminating device of claim 1, wherein the variable frequency control converter further comprises a passive power factor correcting circuit, the passive power factor correcting circuit is electrically connected to the energy converting circuit, and outputs the straight ❿ Stream signal. 11. A lighting device comprising: a plurality of light emitting diode modules; and a variable frequency control converter electrically coupled to the light emitting diode modules and generating a driving signal to drive the light emitting The inverter module includes a frequency conversion circuit, a switch drive circuit and an energy conversion circuit. The frequency conversion circuit is electrically connected to the switch drive circuit, and the switch drive circuit and the energy conversion circuit are electrically connected. Connected, and the frequency conversion circuit outputs a frequency conversion signal according to the driving signal at 27 201028045, the switch driving circuit outputs a switching driving signal according to the frequency conversion signal, and the energy conversion circuit is based on the switch driving signal and the direct current signal output. The driving signal makes the voltage of each of the LED modules substantially constant. 12. The illuminating device of claim 11, wherein each of the illuminating diode modules comprises a plurality of illuminating diodes connected in series and/or in parallel. The illuminating device of claim 11, wherein the variable frequency control converter further comprises a comparison circuit, and the comparison circuit is electrically connected to the frequency conversion circuit and the energy conversion circuit, and according to the driving The signal and a reference voltage output a comparison signal. 14. The illuminating device of claim 13, wherein the voltage of the comparison signal has a corresponding relationship with the frequency of the frequency conversion signal. 15. The illuminating device of claim 13, wherein the variable frequency control converter further comprises an active power factor correction circuit electrically connected to the comparison circuit and the switch driving circuit, and according to the comparison The signal is generated to generate a power factor correction signal input to the switch drive circuit. 16. The illuminating device of claim U, wherein the energy conversion circuit is a return-to-late converter circuit. 17. The illuminating device of claim U, wherein the responsive switching circuit is configured to step down the DC signal. 18. The illuminating device of claim U, wherein the variable frequency control converter further comprises an electromagnetic interference filtering circuit and an entire 28 201028045 flow circuit, and the rectifying circuit and the electromagnetic interference filtering circuit and the energy The conversion circuit is electrically connected and outputs the DC signal. 19. The illuminating device of claim 18, wherein the rectifying circuit is a full wave rectifying circuit. The illuminating device of claim 11, wherein the variable frequency control converter further comprises a passive power factor correcting circuit electrically connected to the energy converting circuit and outputting the direct current Signal. An illuminating device comprising: a plurality of illuminating diode modules; and a variable frequency control converter electrically connected to the illuminating diode modules and generating a driving signal to drive the illuminating diodes The variable frequency control circuit includes a frequency conversion circuit, a switch drive circuit and an energy conversion circuit, the frequency conversion circuit is electrically connected to the switch drive circuit, and the switch drive circuit is electrically connected to the energy conversion circuit, and The variable frequency circuit outputs a variable frequency signal according to the plurality of feedback signals of the light emitting diode module and the driving signal, and the switch driving circuit outputs a switching driving signal according to the variable frequency signal, and the energy conversion circuit is based on the The driving signals of the switch driving signal and the DC signal output the driving signals so that the power of each of the LED modules is substantially constant. The illuminating device of claim 21, wherein each of the illuminating diode modules comprises a plurality of illuminating diodes connected in series and/or in parallel. The illuminating device of claim 21, wherein the variable frequency control converter further comprises a comparison circuit, the comparison circuit and the illuminating diode module, the energy conversion circuit and the frequency conversion The circuit is electrically connected, and outputs a comparison signal according to the driving signal, the feedback signal and a reference voltage. The illuminating device of claim 23, wherein the voltage of the comparison signal has a corresponding relationship with the frequency of the frequency conversion signal. The illuminating device of claim 23, wherein the variable frequency control converter further comprises an active power factor correcting circuit electrically connected to the comparing circuit and the switch driving circuit, and generating according to the comparison signal A power is input to the switch drive circuit due to the correction signal. The illuminating device of claim 21, wherein the energy conversion circuit is a return-to-late converter circuit. 27. The illuminating device of claim 21, wherein the energy conversion circuit is configured to step down the DC signal. The illuminating device of claim 21, wherein the variable frequency control converter further comprises an electromagnetic interference filtering circuit and a rectifying circuit element, and the rectifying circuit and the electromagnetic interference filtering circuit and the energy conversion circuit Electrically connected and output the DC signal. The illuminating device of claim 28, wherein the rectifying circuit is a full-wave rectifying circuit. The illuminating device of claim 21, wherein the variable frequency control converter further comprises a passive power factor correcting circuit, wherein the passive 201028045 power factor correcting circuit is electrically connected to the energy converting circuit, and outputs the DC signal.
    31
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TWI471057B (en) * 2012-12-07 2015-01-21 Princeton Technology Corp A lighting system and controlling method thereof
TWI548304B (en) * 2015-01-05 2016-09-01 國立成功大學 Led driver and driving method thereof

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TWI420970B (en) * 2010-07-16 2013-12-21 Delta Electronics Inc Lighting devices
US8634781B2 (en) 2010-12-29 2014-01-21 Puu-Jiuh Co., Ltd. Remote-control method and emitter cooperated with personal communication device
TWI471057B (en) * 2012-12-07 2015-01-21 Princeton Technology Corp A lighting system and controlling method thereof
TWI548304B (en) * 2015-01-05 2016-09-01 國立成功大學 Led driver and driving method thereof

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