JP2010103217A - Energy saving drive unit for suppressing led radiation temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy saving drive unit for suppressing an LED (light emitting diode) radiation temperature. <P>SOLUTION: The energy saving drive unit 60 for suppressing the LED radiation temperature includes: a direct-current power supply 10; a pulse oscillator 11; a preamplifier 12; a carrier signal control unit 20; a voltage-current control unit 30; and a feedback signal circuit 50. The direct-current power supply 10 provides the power supply required by the LED load end 40. The carrier signal control unit 20 includes: a differential and integral calculus unit 21; a signal comparison circuit 22 connected to the differential and integral calculus unit 21; and at least three signal procesing units 23, 24, 25 connected to the signal comparison circuit 22. The signal processing units are separately connected to the signal difference amplifiers 231, 241, 251, and conducts the comparison and the processing of the signal voltage to an amplifying signal voltage V2 at least three times to output the comparison signal voltage V3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an LED energy-saving drive device, and more particularly to an energy-saving drive device that suppresses high-temperature overheating of an LED.

  As LED technology continues to advance and the brightness of LED products increases, LED lamps feature lighting and light sources featuring early display functions, current energy savings, ecology, long life, and small volume. Since it has progressed into products and has been widely used for general lighting, automobile lighting, road lighting and backlight plates, etc., the market size and growth potential have attracted a great deal of attention. It can be said that this is an industry. However, high efficiency LEDs convert 15 to 20% input efficiency into light energy and the remaining 80 to 85% input efficiency into heat energy. In particular, when heat energy is discharged to the outside without being efficiently processed, there is a problem that the wavelength is affected because the interface temperature of the LED chip is too high, the light emission efficiency is attenuated, and the lifetime is shortened. For this reason, the heat generation problem of the system is considered to be the key to determine the superiority or inferiority of the product functions. In addition, when dealing with conventional heat dissipation technology problems, it is common to make improvements in two aspects such as packaging inside LED and heat conduction and heat dissipation design of the lamp. It has a huge impact on weight and other restrictions. Therefore, not only are there high efficiency LED lamps on the market, but there is no product that does not use a metal case as a heat dissipation device.

  When an LED is driven to emit light for a long time, not only high heat is generated but also the light intensity (Lm) is likely to be affected. The light emission method by driving the LED at an early stage is to directly input a DC current, stimulate the LED, and generate light. The LED is mainly composed of GaAsP or GaP, and the wavelength and color of the emitted light differ depending on the material. When GaAsP is used, the color of the emitted light is red. When using GaP, the color of the emitted light is between yellow and green. As shown in FIG. 1A, the luminous intensity of the emitted light of the LED and the energization current are in a direct proportional relationship. Therefore, as shown in FIG. 1B, when adjusting the luminous intensity, the comparatively low (L) or relatively high (H) DC It can be controlled by inputting the current (I). However, such a driving method causes the LED to conduct and emit light over a long period of time, and thus raises the temperature within a short period of time. In addition, unless a good heat dissipation device is prepared, the brightness of the LED is attenuated and the reliability is lowered.

  As shown in FIGS. 2A and 2B, the conventional technique employs a PWM (Pulse Width Modulation) circuit for driving the LED, and the input voltage amplitude (shown in FIG. 2A) is a pulse having a certain width (shown in FIG. 2A). 2B). In other words, the main function is to convert the amplitude data into the pulse width, so it is possible not only to monitor and control the output state of the power circuit, but also to provide a control signal to the power unit and to achieve high efficiency It can be widely applied to the conversion circuit. However, the oscillation waveform and amplitude voltage of the PWM circuit are constant. For example, if the amplitude voltage for driving the LED is set to 5 V, the waveform and amplitude supply the voltage and current during operation according to this set value. This is one of the factors that make it difficult to lower the operating temperature of the LED.

  The reason LED lighting has not yet become popular is that the efficiency of achieving heat dissipation by LED packaging is limited. This is because a high temperature is generated unless the voltage and current during operation change. Therefore, even if heat radiation is achieved by packaging, it is difficult to achieve the desired effect. On the other hand, when a heat radiating device such as a plurality of heat radiating fins is added to the lamp, not only the volume is increased and the space design in the room is disadvantageous, but the surface of the lamp is still maintained at a high temperature. For example, when a lamp using an LED as a light source is used, the case is very hot, so that not only the case is heated, but also the use situation is affected. In addition, in order to avoid a situation in which deformation or burning occurs due to high temperature, there is a limitation that the lamp must use a metal case. Therefore, there is room for improvement as a whole.

  A main object of the present invention is to provide an energy-saving drive device that suppresses LED heat dissipation temperature. The energy-saving drive device that suppresses the LED heat dissipation temperature continuously compares the signal voltage obtained by the feedback signal voltage acquired through the load end with the calculus processor after the device that converts the signal voltage into operating energy is controlled. Modify the voltage and current control operation. As a result, it is possible to drive a high-brightness, high-efficiency LED according to the characteristics of the LED load under conditions of low voltage and low current, so that the problem of excessively high temperature does not occur and only an energy saving effect is obtained. Rather, it is possible to enhance the effect of safely protecting the environment.

In order to achieve the above-mentioned object, an energy-saving drive device that suppresses LED heat dissipation temperature according to the technical means of the present invention includes a DC power supply, a pulse oscillator (Pulse OSC), a preamplifier, a carrier signal control unit, a voltage current control unit, and a feedback signal circuit. Prepare.
The direct current power source provides a necessary power source for the LED load end.
The pulse oscillator (PulseOSC) generates a pulse signal voltage V1 by a current input from a DC power supply.

The preamplifier is connected to the output terminal of the pulse oscillator and amplifies the pulse signal voltage V1 to generate an amplified signal voltage V2.
The carrier signal control unit includes a calculus processor, a signal comparison circuit connected to the calculus processor, and at least three signal processors connected to the signal comparison circuit. The signal processor is separately connected to a signal difference amplifier, performs comparison and processing of the signal voltage with respect to the amplified signal voltage V2 at least three times, and outputs a comparison signal voltage V3.

  The voltage / current control unit modulates the comparison signal voltage V3 by the signal converter, and then performs processing by the DC voltage processor and the constant voltage circuit, and the DC current processor and the constant current circuit. Subsequently, the constant voltage V4 and the constant current I4 that have been compared and processed by the power amplifier are amplified and output to the LED load end.

  The feedback signal circuit is connected between the LED load end and the calculus processor. The feedback signal circuit obtains the load signal voltage V5 via the LED load terminal, subsequently obtains the comparison signal voltage V6 by feedback, and sends it to the input terminal of the calculus processor for processing. Subsequently, the signal processor performs adjustment and control operations of the software program at least three times, and the signal difference amplifier automatically adjusts, corrects and amplifies the attenuated signal voltage, and at the same time the DC voltage processor and the DC Connect to the current processor separately. Subsequently, since the power amplifier outputs a new operating voltage signal V4n and drives the LED load terminal again, the LED load terminal operates at a low voltage and a low current by adjusting and controlling the corrected operating voltage signal. In addition, the heat radiation temperature can be suppressed.

(One embodiment)
As shown in FIG. 3, the energy-saving drive device 60 for suppressing the LED heat dissipation temperature according to the embodiment of the present invention includes a DC power supply 10, a pulse oscillator (Pulse OSC) 11, a preamplifier 12, a carrier signal control unit 20, and a voltage / current control unit. 30 and a feedback signal circuit 50.

  The DC power source 10 provides a necessary power source for the LED load end 40.

  The pulse oscillator (PulseOSC) 11 generates a pulse signal voltage V <b> 1 by a current input from the DC power supply 10.

  The preamplifier 12 is connected to the output terminal of the pulse oscillator 11 and amplifies the pulse signal voltage V1 to generate an amplified signal voltage V2.

  The carrier signal control unit 20 includes a calculus processor 21, a signal comparison circuit 22 connected to the calculus processor 21, and at least three signal processors 23, 24, and 25 connected to the signal comparison circuit 22. The signal processors 23, 24, and 25 are connected to signal difference amplifiers 231, 241, and 251 separately, perform comparison and processing of the signal voltage with respect to the amplified signal voltage V 2 at least three times, and output the comparison signal voltage V 3. .

  The voltage / current control unit 30 modulates the comparison signal voltage V3 by the signal converter 31, and then performs processing by the DC voltage processor 32 and the constant voltage circuit 33, and the DC current processor 34 and the constant current circuit 35. Subsequently, the constant voltage V4 and the constant current I4, which have been compared and processed by the power amplifier 36, are amplified and output to the LED load terminal 40.

  The feedback signal circuit 50 is connected between the LED load end 40 and the calculus processor 31. The feedback signal circuit 50 obtains the load signal voltage V <b> 5 through the LED load terminal 40. Subsequently, the comparison signal voltage V6 is obtained by feedback and sent to the input terminal of the calculus processor 21 for processing. Subsequently, the signal processors 23, 24, and 25 perform software program adjustment and control operations at least three times. The signal difference amplifiers 231, 241, and 251 automatically adjust, correct, and amplify the attenuated signal voltage, and are separately connected to the DC voltage processor 32 and the DC current processor 34 at the same time. Subsequently, since the power amplifier 36 outputs a new operating voltage signal V4n and drives the LED load end 40 again, the LED load end 40 is adjusted to a low voltage and a low current by adjusting and operating the corrected operating voltage signal. It is possible to operate at a low temperature and to suppress the heat radiation temperature.

  FIG. 4 is a circuit diagram showing a state in which the energy saving drive device for suppressing the LED heat radiation temperature according to an embodiment of the present invention is applied to the LED load end 40. The energy-saving drive device 60 that suppresses the LED heat dissipation temperature according to an embodiment of the present invention is designed in an IC form, and components necessary for the energy-saving drive device 60 that suppresses the LED heat dissipation temperature are arranged in the periphery. Detailed description is omitted. The LED load end 40 may be a reflex spherical LED 40A as shown in FIG. 5A, a light bulb type LED as shown in FIG. 5B, or a fluorescent LED 40C as shown in FIG. 5C. Since the size of the drive circuit according to the present embodiment is very small (around 1.5 * 1.5 * 1.0 cm), it is easy to mount it inside the LED illumination described above.

  The upper graph in FIG. 6 is a graph showing general PWM, for example, a square wave having a voltage amplitude high of 5 V, a voltage amplitude Low of 0 V, and a frequency of 1 kHz. As shown in the lower graph of FIG. 6, in the present embodiment, the carrier signal control unit 20 and the voltage / current control unit 30 shown in FIG. The comparison signal V6 is obtained via the circuit 50, and then the signal voltage comparison is continuously performed via the calculus processor 21, and the adjustment and control operations of the software are performed at least three times, and the oscillation waveform, amplitude voltage, and By controlling the linearity of the waveform, the carrier is modulated into an irregular sawtooth shape as shown in the lower part of FIG. 6 and then amplified, and the shape is as shown in FIGS. 7A and 7B. In the carrier modulation shown in FIG. 7A, an amplitude voltage of about 1.8 V is input, followed by multi-order signal comparison such as primary signal comparison, secondary signal comparison, tertiary signal comparison, and quaternary signal comparison, and software program. Perform adjustment and control operations, and automatically adjust, correct and amplify the signal voltage attenuated by the signal difference amplifiers 231, 241, 251. Subsequently, the power amplifier 36 outputs a new operating voltage signal V4n, It is to correct the voltage and current. That is, the energy-saving drive device for suppressing the LED heat dissipation temperature according to the present invention achieves an output with energy-saving effect by adjusting the impedance matching of the voltage and current at the load end according to the load characteristics of the LED product and minimizing wear. It is possible. In the shaded area of FIG. 7A, f1 and f2 indicate the saved voltage and current. As shown in FIG. 7B, when the current is different, the amplitude is changed, that is, the waveform and the amplitude can be changed by controlling increase / decrease of the input current.

  As described above, the present invention drives the high-brightness and high-efficiency LED under low voltage and low current conditions by continuously performing the adjustment and control operation, thus having an energy saving effect and solving the heat dissipation problem. Not only is it possible, but it is also possible to achieve environmental protection and enhance safety effects.

  Tests and comparisons were performed on the driving device of the present invention applied to the LED by the technical means described above and the conventional driving device. The results are as shown in Table 1 below.

  As shown in Table 1 above, the driving device 60 according to the present invention acquires the comparison signal V6 via the LED load end and the feedback signal circuit, and then continuously performs the signal voltage comparison via the calculus processor 21. And at least three adjustments and control operations of the soft air, followed by automatic adjustment, correction and amplification of the signal voltage attenuated by the signal difference amplifier, followed by voltage and current by the new operating voltage signal. To correct, drive the LED under 0.16 (DCA) and 0.18 (DCA) low current conditions, the temperature is separately 39 ° C-40 ° C and 52 ° C-53 ° C without high temperature phenomenon Not only can it be maintained, but it is also possible to relatively increase the LED brightness (Lux) and reduce the power consumption W.

  As described above, since the present invention can drive a high-brightness and high-efficiency LED under low voltage and low current conditions, it has not only an energy saving effect but also a problem that the temperature becomes too high. Therefore, if the present invention is applied to the inside of a reflex bulb type LED 40A as shown in FIG. 5A, a light bulb type LED 40B as shown in FIG. 5B or a fluorescent light type LED 40C as shown in FIG. Not only is it possible to maintain the original volume without the need to add a heat dissipation device outside the product, but it is not necessary to replace the entire set of lamps, and compatibility with older lamps is realized. Therefore, it has convenience and practicality.

As described above, the technical means disclosed by the present invention has the requirements of claims such as “novelty”, “inventive step” and “can be used industrially”.
The above-described drawings and descriptions are merely examples for explaining the embodiment of the present invention. Therefore, it is not possible for a person familiar with this technology to make equivalent changes or modifications based on the scope of the present invention. It should belong to the claims of the present invention.

It is a graph which shows the relationship between the current and lumen of a conventional LED. It is a graph which shows the relationship of the electric current of conventional LED, and time. It is a graph which shows the conventional voltage amplitude. It is a graph which shows the PWM amplitude of the conventional LED drive circuit. It is a schematic diagram which shows the structure of the energy saving drive device which suppresses LED thermal radiation temperature by one Embodiment of this invention. It is a circuit diagram showing the state where the energy-saving drive device which controls LED heat dissipation temperature by one embodiment of the present invention was applied to LED load. It is a schematic diagram which shows the state by which the energy-saving drive device which suppresses LED thermal radiation temperature by one Embodiment of this invention was applied to the reflex spherical LED. It is a schematic diagram which shows the state by which the energy-saving drive device which suppresses LED thermal radiation temperature by one Embodiment of this invention was applied to the light bulb type LED. It is a schematic diagram which shows the state by which the energy-saving drive device which suppresses LED thermal radiation temperature by one Embodiment of this invention was applied to fluorescent lamp type LED. It is a graph which shows the amplitude of the energy-saving drive device which suppresses LED thermal radiation temperature by one Embodiment of this invention, and the amplitude of the conventional one. It is an enlarged view which shows the carrier amplitude modulation of FIG. It is an enlarged view which shows the carrier amplitude modulation of FIG.

Explanation of symbols

  10: DC power supply, 11 pulse oscillator, 12: preamplifier, 20: carrier signal control unit, 21: calculus processor, 22: signal comparison circuit, 23: signal processor, 24: signal processor, 25: signal processor, 231: Signal difference amplifier, 241: Signal difference amplifier, 251: Signal difference amplifier, 30: Voltage current control unit, 31: Signal converter, 32: DC voltage processor, 33: Constant voltage circuit, 34: DC current processor , 35: constant current circuit, 36 power amplifier, 40: LED load end, 40A: reflex bulb, 40B: bulb, 40C: fluorescent lamp, 50: feedback signal circuit, 60: drive device, I4: constant current, V1: pulse Signal voltage, V2: amplified signal voltage, V3: comparison signal voltage, V4: constant voltage, V4n: operating voltage signal, V5: load signal voltage, V6: comparison signal voltage

Claims (2)

A DC power supply that provides the necessary power to the LED load end;
A pulse oscillator that generates a pulse signal voltage (V1) by a current input from the DC power supply;
A preamplifier connected to the output terminal of the pulse oscillator and amplifying the pulse signal voltage (V1) to generate an amplified signal voltage (V2);
A carrier signal control unit having a calculus processor, a signal comparison circuit connected to the calculus processor, and at least three signal processors connected to the signal comparison circuit;
A voltage / current control unit having a signal converter, a DC voltage processor and a constant voltage circuit, a DC current processor and a constant current circuit, and a power amplifier;
A feedback signal circuit connected between the LED load end and the calculus processor,
The signal processor is separately connected to a signal difference amplifier, performs comparison and processing of the signal voltage on the amplified signal voltage (V2) at least three times, and outputs a comparison signal voltage (V3),
The voltage / current control unit modulates the comparison signal voltage (V3) by the signal converter, and then processes it by the DC voltage processor and the constant voltage circuit, and the DC current processor and the constant current circuit. And then amplifying the constant voltage (V4) and constant current (I4) compared and processed by the power amplifier, and output to the LED load end,
The feedback signal circuit obtains a load signal voltage (V5) via the LED load terminal, subsequently obtains a comparison signal voltage (V6) by feedback, and sends it to the input terminal of the calculus processor for processing. Subsequently, the signal processor performs adjustment and control operations of a software program at least three times, and the signal difference amplifier automatically adjusts, corrects and amplifies the attenuated signal voltage and at the same time the DC voltage processor. And separately connected to the DC current processor, and then the warp amplifier outputs a new operating voltage signal (V4n) and drives the LED load terminal again, so that the LED load terminal is a modified operating voltage signal. It is characterized by being able to drive at low voltage and low current and to control heat dissipation temperature by adjusting and controlling operation. Suppressing energy saving drive an LED radiating temperature.   The energy saving drive device for suppressing LED heat radiation temperature according to claim 1, wherein the LED load end includes any one of a reflex spherical LED, a light bulb type LED, and a fluorescent lamp type LED.

Images