JP2019046685A - Lighting apparatus - Google Patents

Abstract

To provide a lighting apparatus using an LED which is capable of obtaining stable light emission, eliminates the need of a smoothing capacitor, and is capable of excluding a switching regulator for voltage/current control and relatively reducing a loss in a voltage/current control element by optimizing operation efficiency of a current control circuit.SOLUTION: The present invention relates to a lighting apparatus using an LED which comprises a circuit structure change control circuit for changing an LED connection circuit structure dynamically correspondingly to an inputted AC waveform, optimizes an application voltage and a request voltage of an LED element that are successively changed, and optimizes operation energy efficiency of a current control circuit, thereby relatively reducing a loss in the control circuit and the element. A connection circuit structure pattern subjected to the change is preset and the lighting apparatus comprises a connection mechanism 1 corresponding to the preset connection circuit structure pattern. In accordance with control signal input which is supplied to the connection mechanism, the LED connection circuit structure is changed into a form suitable for an AC power waveform to be applied to an LED light-emitting element.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device using LEDs.

  Lighting devices using light emitting diodes (LED elements, hereinafter also simply referred to as LEDs) have characteristics of longer life and lower power consumption than conventional lighting fixtures such as fluorescent lamps and incandescent bulbs. It is expected to be a next-generation lighting device that excels in consideration. In the case of using an AC power source directly as a drive power source, the AC power source is full-wave rectified and supplied to the LED array.

  When the AC power supply is half-wave rectified, only a half-wave of one polarity (for example, plus side) of the AC alternating waveform becomes an intermittent pulsation waveform. On the other hand, when full-wave rectification is performed, a continuous pulsating waveform is obtained in which one polarity (for example, the positive side) and the other polarity (the negative side) half-wave are folded back. The AC direct drive is a system in which a power supply having such a pulsating waveform is directly applied to an LED to light it.

  An LED having a fixed circuit structure has a predetermined voltage for lighting (lighting voltage) and an operating current, and is turned off below the lighting voltage. When a full-wave rectified pulsating voltage is applied, the voltage of the pulsating waveform turns on (on) above the lighting voltage, turns off (off) below that voltage, and repeats this. The repetition of the period from the turn-off to the next turn-on (turn-off period) is so-called flicker (flickering of illumination light). In the case of a 50 Hz AC power supply, flicker occurs 100 times per second. 100HZ flickering is rarely perceived because of its faster speed than moving vision, but it is proved that this extinction period is unconsciously recognized as a psychologically unpleasant phenomenon and is physically affected. Has been.

  The generation of high-frequency noise from the LED drive circuit is extremely significant in the DC drive system currently employed by many LED lighting devices. The direct current drive system converts alternating current into a smooth direct current voltage and drives the LED with a predetermined level of direct current voltage and current. A high-frequency high energy is generated due to a switching operation in an AC / DC converter circuit used to convert an AC power source into a DC, that is, an inverter circuit.

  Further, such a power supply circuit has a large number of elements, which makes the circuit complicated and expensive. Further, the smoothing circuit in this case requires a large-capacity capacitor such as an electrolytic capacitor and a voltage transformer (transformer). Such an electrical component has a shorter life than an LED and is not preferable in combination with an LED, which is a long-life lighting means.

  For example, Patent Document 1 discloses a DC drive type LED technology as a disclosure of conventional technology relating to LED driving, and lighting with a DC smoothing voltage while reducing high-frequency components of commercial AC input current. An LED lighting device (LED drive circuit) that can obtain a light output equivalent to that of the above case is disclosed.

  On the other hand, Patent Document 2 is an LED drive circuit that drives an LED array having a plurality of LEDs connected in series, and includes a rectifier that rectifies an AC input, an operational amplifier, and an output group of the operational amplifier via a voltage dividing resistor. A constant current circuit having a plurality of driving transistors connected to each other, one end on the output side of the rectifier is connected to the input side of the LED string, and one end on the output side of the plurality of transistors is different in the LED string, respectively. An LED drive circuit is disclosed in which a plurality of transistors are selectively driven according to an AC input voltage by being connected to connection points corresponding to the number of LED groups.

JP 2009-134945 A JP 2013-20929 A

  However, as a result of considering the promotion of popularization, the LED drive circuit disclosed in Patent Document 2 also employs a circuit configuration that can be directly driven by an AC input. For example, an improved LED driving circuit that can follow current more finely with respect to the increase / decrease of the voltage that has been full-wave rectified 100 times per second is desired. In particular, when driving an LED string in which a large number of LEDs are connected in series, the period during which the LED string is not lit (extinguishment period) due to fluctuations in the AC input voltage becomes longer and flicker becomes noticeable.

    There is a need for an illuminating device using an LED that can further suppress flicker felt by human eyes, a driving circuit for the illuminating device using the LED, and a driving method for the illuminating device using the LED. Overall, it has a simple structure, can reduce the number of parts, can be manufactured at a low cost, has high reliability, and provides stable light emission that solves the problems of flicker and dark time. Therefore, it can be said that there is a demand for realizing low power consumption and long life.

   The authors have solved these problems, obtained stable light emission with a simple configuration, eliminate the need for a smoothing capacitor, reduce costs and improve reliability, achieve low power consumption, and switch to voltage-current control. We are eagerly developing a lighting device using an LED that can eliminate the regulator and does not generate electromagnetic noise, a driving circuit for the lighting device using the LED, and a driving method for the lighting device using the LED. (See Japanese Patent Application No. 2016-117619)

  The present invention further develops the conventional configuration, improves the operation efficiency of the structure-changing element by combining with the metal wiring, and optimizes the applied voltage and the required voltage of the element that change more and more sequentially by a plurality of coupling units. The present invention provides a lighting device using an LED characterized by relatively reducing loss in a control circuit and an element by optimizing the operation efficiency of a current control circuit.

  The present invention includes a plurality of LED light-emitting elements and an LED drive circuit for driving the LED light-emitting elements, and the LED light-emitting elements form an LED connection structure composed of the plurality of LED light-emitting elements. The control circuit has a configuration that dynamically changes the LED connection structure in response to the input AC waveform, minimizing the sequentially applied voltage and the required voltage of the element, and optimizing the operating efficiency of the current control circuit In the illumination device using the LED, which is characterized by relatively reducing loss in the control circuit and the element, the connection structure pattern to be changed in advance when the LED connection structure is changed A connection mechanism corresponding to the preset connection structure pattern, and corresponding to the preset connection structure pattern from the connection structure change control circuit. According to the control signal supplied to the connection mechanism, the loss heat generation due to the on-resistance of the switching element is reduced by dynamically changing the LED connection structure to a form suitable for the AC power waveform applied to the light emitting element. The lighting device is characterized in that, by optimizing the operation efficiency of the current control circuit, the energy efficiency is improved even with a small amount of power circuit resources, and a stable luminous flux is realized.

  Further, the present invention is characterized in that the connection structure change control circuit dynamically changes and controls the circuit structure of the light emitting element structure in response to a control signal input.

  Further, according to the present invention, the light emitting element, the connection mechanism corresponding to the preset connection structure pattern, and the connection structure change control circuit are formed in the vicinity of each other, and the light emitting element and the preset connection structure pattern Corresponding connection conductors and the connection structure change control circuit can be electrically connected to each other on the substrate, and the substrates connected by the structure capable of electrical connection are integrated by a semiconductor process. It is characterized by that.

  Further, the present invention is characterized in that the circuit structure changing control circuit is constituted by a switch element. Further, the present invention is characterized in that the switch element is a transistor. Furthermore, the present invention is characterized in that the transistor is any one of a MOSFET, JFET, bipolar transistor or the like constituted by a semiconductor structure.

  In addition, the present invention uses a semiconductor, a metal, and a transparent conductive material in which a connection mechanism corresponding to the preset connection structure pattern is selectively formed on a substrate substrate. It is characterized by being connected.

  Further, the present invention is configured such that the LED connection structure is an LED light-emitting element having the power of 2 or a combination structure LED light-emitting element that can have an equivalent electrical load characteristic, and the structure change control in the LED connection structure Is divided into light-emitting units constituted by light-emitting element groups having a combination power structure that can have an electric load characteristic equivalent to the power of 2 less than the total number of light-emitting elements, and changing the connection form of the light-emitting elements The connection mechanism corresponding to a preset connection structure pattern and the connection structure change control circuit are characterized in that the connection structure pattern is dynamically changed in response to an applied control signal input.

  In addition, the present invention constantly adjusts the matrix structure change control signal to the optimum value by constantly comparing the connection structure change control circuit with the normalized reference voltage corresponding to the AC power voltage waveform that changes sequentially. It is characterized by being confirmed.

  Further, according to the present invention, in accordance with the change of the dynamic LED connection structure in the voltage applied to each LED light emitting element, the lighting device dynamically changes to a preset total current specified value corresponding to each structure. A constant current control circuit that can be changed is provided, and the constant current control circuit performs current control by a feedback circuit regardless of a voltage applied to the same structure. Furthermore, the present invention is characterized in that the constant current control circuit is arranged as an individual constant current control circuit for each light emitting unit of the LED connection structure.

  The present invention also provides a power supply unit that supplies a full-wave rectified or both-wave rectified pulsating current from a commercial power supply to the LED connection structure, a synchronous waveform filter that generates a synchronization signal for the waveform of the input commercial power supply, and the synchronous waveform An operation state comparison detector for determining an operation state based on a signal from the filter, and a circuit structure change control element, a wiring structure, and a matrix array structure change for changing the connection structure of the LED matrix array to an arbitrary or optimum state And a control circuit.

  Further, the present invention is connected to a power supply unit that supplies a pulsating current that is full-wave rectified or both-wave rectified from a commercial power supply to an LED connection structure, and obtains a filtering signal from the pulsating current, It outputs to the operation state comparison detector to determine.

  Further, in the present invention, the power supply unit that supplies the pulsating current obtained by full-wave rectification or both-wave rectification from a commercial power supply to the LED connection structure and the synchronous waveform filter is a bridge rectifier, and the bridge rectifier includes the LED connection structure and the synchronous waveform. A pulsating flow that is full-wave rectified or both-wave rectified from a commercial power supply is output to both filters. Further, in the present invention, the power supply unit that supplies the pulsating current obtained by full-wave rectification or both-wave rectification from the commercial power supply to the LED connection structure and the synchronous waveform filter is a bridge rectifier, and the bridge rectifier is connected to the LED connection structure with the commercial power supply. A first bridge rectifier that outputs a full-wave rectified or double-wave rectified pulsating current and a second bridge rectifier that outputs a full-wave rectified or double-wave rectified pulsating current from a commercial power supply to the synchronous waveform filter. Features.

  The present invention also includes a state control current lookup table in which the lighting device controls a control element for circuit structure change by a constant current control circuit capable of dynamically changing a set value, and the normalized voltage and A stepwise constant current control is performed by a constant current control circuit by comparing a look-up table holding a current relationship with a sequentially changing AC voltage waveform.

  The lighting device using the LED according to the present invention can obtain stable light emission that solves the problems of flicker and dark time even with a simple circuit configuration, and eliminates the need for a smoothing capacitor after rectification and a large capacity electrolytic capacitor of a switching system. The device can be manufactured at low cost and long-term reliability is improved, and the problem of high-frequency noise is reduced by reducing the operating conditions of the current control circuit, and the applied voltage and elements that are successively changed effectively. Therefore, the operating energy efficiency of the current control circuit is optimized, and the control circuit and the lighting device using the LED, which is characterized by reducing loss in the element, can be provided. .

FIG. 1 is a conceptual diagram for explaining a configuration of an illumination device using an LED according to the present invention. FIG. 2 is a conceptual diagram for further explaining the configuration of the illumination device using the LED according to the present invention. FIG. 3 is a conceptual diagram showing an example of the configuration of the switch element 2 constituting the connection structure change control circuit. FIG. 4 is a diagram for explaining a driving method as a base of the present invention. FIG. 5 is an explanatory diagram for understanding the switch matrix operation in this embodiment. FIG. 6 is a conceptual diagram showing the AC voltage and state (states 2 to 6) after practical normalization, the switch timing of the LED array matrix, and the waveform synchronization pattern. FIG. 7 is a diagram for explaining an array shape change pattern of the LED array matrix. FIG. 8 is a diagram for explaining an array shape change pattern of the LED array matrix. FIG. 9 is a diagram for explaining that all the LEDs can be turned on when all LEDs exceed the minimum activation voltage VF of the LEDs. FIG. 10 is a diagram for explaining an example in which the configuration according to the present invention is integrated using semiconductor technology.

  Hereinafter, an illumination device using an LED according to the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram for explaining a configuration of an illumination device using an LED according to the present invention. An illumination device using an LED according to the present invention includes a plurality of LED light emitting elements and an LED drive circuit for driving the LED light emitting elements, and the LED light emitting elements form an LED connection structure including a plurality of LED light emitting elements, The LED connection structure has a configuration in which the LED connection structure is dynamically changed according to an input AC waveform by a structure change control circuit, and the applied voltage and the required voltage of the element that are sequentially changed are optimized, A lighting device using an LED characterized by relatively reducing loss in the control circuit and elements by optimizing the operation efficiency of the control circuit, for the purpose of changing the LED connection structure The connection structure pattern to be changed in advance is set, and the connection mechanism 1 corresponding to the preset connection structure pattern is provided, and the connection structure change control circuit 2 According to the control signal supplied to the connection mechanism corresponding to the connection structure pattern set for the purpose, the LED connection structure is changed to a form suitable for the AC power waveform applied to the light-emitting element, so that the on-resistance of the switch element is increased. A lighting device is realized, in which the heat loss caused by this is reduced, and the operating condition of the current control circuit is relaxed and the operating energy efficiency is improved by the optimized connection structure.

  FIG. 2 is a conceptual diagram for further explaining the configuration of the illumination device using the LED according to the present invention. A connection mechanism 1 corresponding to a preset connection structure pattern is prepared, and by selecting this, the LED connection structure can be changed to a form suitable for the AC power waveform applied to the light emitting element.

  FIG. 3 is a conceptual diagram showing an example of the configuration of the switch element 3 constituting the connection structure change control circuit. The circuit structure changing control circuit includes a switching element, and a transistor is preferably used as the switching element. In this embodiment, a MOSFET having a semiconductor structure is used as a transistor, but a JFET, a bipolar transistor, or the like may be used. With this configuration, the LED connection structure can be changed to a form suitable for the AC power waveform applied to the light emitting element.

  FIG. 4 is a diagram for explaining a driving method as a base of the present invention. In the present invention, a conventional LED element, which has been treated as an alternative to an analog light bulb, is handled like a digital bit string, so that stable light emission that solves the problems of flicker and dark time can be obtained with a simple configuration. The rectifying smoothing capacitor and the large-capacitance electrolytic capacitor for the switching regulator are not required and can be manufactured at low cost. The long-term reliability is improved and the operating conditions of the current control circuit are optimized. This is an illuminating device using an LED that realizes minimization of loss in the element and reduces high-frequency noise.

  The present invention includes a plurality of LED light-emitting elements and an LED drive circuit for driving the LED light-emitting elements, and the LED light-emitting elements form an LED connection structure composed of the plurality of LED light-emitting elements. The control circuit has a configuration that dynamically changes the LED connection structure according to the input AC waveform, optimizes the sequentially applied voltage and the required voltage of the element, and optimizes the operation efficiency of the current control circuit A lighting device using an LED characterized by relatively reducing loss in a control circuit and an element, and a connection structure pattern to be changed in advance is set when the LED connection structure is changed A connection mechanism corresponding to the preset connection structure pattern, and corresponding to the preset connection structure pattern from the connection structure change control circuit. By changing the LED connection structure to a form suitable for the AC power waveform applied to the light emitting element according to the control signal supplied to the connection mechanism, loss heat generation due to the ON resistance of the switching element is reduced and optimized The lighting device is characterized in that the operation efficiency of the current control circuit is improved by the connected structure.

  Further, the present invention is characterized in that the connection structure change control circuit dynamically changes and controls the circuit structure of the light emitting element structure in response to a control signal input.

  Further, according to the present invention, the light emitting element, the connection mechanism corresponding to the preset connection structure pattern, and the connection structure change control circuit are formed in the vicinity of each other, and the light emitting element and the preset connection structure pattern Corresponding connection conductors and the connection structure change control circuit can be electrically connected to each other on the substrate, and the substrates combined by the structure capable of electrical connection are the PCB substrate and the MCM substrate. Alternatively, it is integrated by a semiconductor process.

  Further, the present invention is characterized in that the circuit structure changing control circuit is constituted by a switching element. Furthermore, the present invention is characterized in that the switching element is a transistor. Furthermore, the present invention is characterized in that the transistor is any one of a MOSFET, JFET, bipolar transistor or the like constituted by a semiconductor structure.

  In addition, the present invention uses a semiconductor, a metal, and a transparent conductive material in which a connection mechanism corresponding to the preset connection structure pattern is selectively formed on a substrate substrate. It is characterized by being connected.

  Further, the present invention is configured such that the LED connection structure is an LED light-emitting element having the power of 2 or a combination structure LED light-emitting element that can have an equivalent electrical load characteristic, and the structure change control in the LED connection structure Is divided into light-emitting units constituted by light-emitting element groups having a combination power structure that can have an electric load characteristic equivalent to the power of 2 less than the total number of light-emitting elements, and changing the connection form of the light-emitting elements The connection mechanism corresponding to a preset connection structure pattern and the connection structure change control circuit are characterized in that the connection structure pattern is dynamically changed in response to an applied control signal input.

  In addition, the present invention constantly adjusts the matrix structure change control signal to the optimum value by constantly comparing the connection structure change control circuit with the normalized reference voltage corresponding to the AC power voltage waveform that changes sequentially. It is characterized by being confirmed.

  Further, according to the present invention, in accordance with the change of the dynamic LED connection structure in the voltage applied to each LED light emitting element, the lighting device dynamically changes to a preset total current specified value corresponding to each structure. A constant current control circuit that can be changed is provided, and the constant current control circuit performs current control by a feedback circuit regardless of a voltage applied to the same structure. Furthermore, the present invention is characterized in that the constant current control circuit is arranged as an individual constant current control circuit for each light emitting unit of the LED connection structure.

  The present invention also provides a power supply unit that supplies a full-wave rectified or both-wave rectified pulsating current from a commercial power supply to the LED connection structure, a synchronous waveform filter that generates a synchronization signal for the waveform of the input commercial power supply, and the synchronous waveform An operation state comparison detector for determining an operation state based on a signal from the filter, and a circuit structure change control element, a wiring structure, and a matrix array structure change for changing the connection structure of the LED matrix array to an arbitrary or optimum state And a control circuit.

  Further, the present invention is connected to a power supply unit that supplies a pulsating current that is full-wave rectified or both-wave rectified from a commercial power supply to an LED connection structure, and obtains a filtering signal from the pulsating current, It outputs to the operation state comparison detector to determine.

  Further, in the present invention, the power supply unit that supplies the pulsating current obtained by full-wave rectification or both-wave rectification from a commercial power supply to the LED connection structure and the synchronous waveform filter is a bridge rectifier, and the bridge rectifier includes the LED connection structure and the synchronous waveform. A pulsating flow that is full-wave rectified or both-wave rectified from a commercial power supply is output to both filters. Further, in the present invention, the power supply unit that supplies the pulsating current obtained by full-wave rectification or both-wave rectification from the commercial power supply to the LED connection structure and the synchronous waveform filter is a bridge rectifier, and the bridge rectifier is connected to the LED connection structure with the commercial power supply. A first bridge rectifier that outputs a full-wave rectified or double-wave rectified pulsating current and a second bridge rectifier that outputs a full-wave rectified or double-wave rectified pulsating current from a commercial power supply to the synchronous waveform filter. Features.

  The present invention also includes a state control current lookup table in which the lighting device controls a control element for circuit structure change by a constant current control circuit capable of dynamically changing a set value, and the normalized voltage and A stepwise constant current control is performed by a constant current control circuit based on a look-up table that holds a current relationship and an alternating voltage comparison that changes sequentially.

  The present invention is not a development type of a light bulb lighting device, but is a configuration that reasonably realizes a lighting power control method based on a new idea using digital technology, and it is also possible to use no switching regulator. This eliminates the need for a smoothing capacitor and contributes to cost reduction. Since all LED elements can emit light from a low voltage, it has good flicker performance and has no lifetime parts, so it is extremely reliable. A lighting device using a high LED, a driving circuit of the lighting device using LED, and a lighting device using LED are realized.

  The lighting device using the LED according to the present invention, the driving circuit of the lighting device using the LED, and the lighting device using the LED can be added with a dimming function, such as a street light, a crime prevention light, a hospital, a medical device, It can be suitably applied to amusement facilities, radio facilities, airplanes, etc., and as a product, it is preferably used for fluorescent lamp type straight tubes, base lights, downlights, floodlights, replaceable LED bulbs and the like. Further, since the circuit configuration is easy to make LSI, further cost reduction can be achieved in the future.

  FIG. 1 is a conceptual diagram for explaining a configuration of an illumination device using an LED according to the present invention. An illumination device using an LED according to the present invention includes a plurality of LED light emitting elements and an LED drive circuit for driving the LED light emitting elements, and the LED light emitting elements form an LED connection structure including a plurality of LED light emitting elements, The LED connection structure has a configuration in which the LED connection structure is dynamically changed according to an input AC waveform by a structure change control circuit, and the applied voltage and the required voltage of the element that are sequentially changed are optimized, A lighting device using LEDs characterized in that the loss in the control circuit and elements is relatively reduced by optimizing the operation efficiency of the control circuit, which is changed in advance when the LED connection structure is changed And a connection mechanism 11 corresponding to the preset connection structure pattern is provided, and the connection structure change control circuit 12 supplies the connection structure pattern. According to the control signal supplied to the connection mechanism corresponding to the set connection structure pattern, the LED connection structure is changed to a form suitable for the AC power waveform applied to the light emitting element, resulting in the on-resistance of the switch element. An illuminating device characterized in that the loss heat generation is reduced and the operating energy efficiency of the current control circuit is optimized.

  FIG. 2 is a conceptual diagram for further explaining the configuration of the illumination device using the LED according to the present invention. A connection mechanism 11 corresponding to a preset connection structure pattern is prepared, and by selecting this, the LED connection structure can be changed to a form suitable for the AC power waveform applied to the light emitting element.

  FIG. 3 is a conceptual diagram showing an example of the configuration of the switch element 12 constituting the connection structure change control circuit. The circuit structure changing control circuit includes a switching element, and a transistor is preferably used as the switching element. In this embodiment, a MOSFET having a semiconductor structure is used as a transistor, but a JFET, a bipolar transistor, or the like may be used. With this configuration, the LED connection structure can be changed to a form suitable for the AC power waveform applied to the light emitting element.

  FIG. 4 is a diagram for explaining a driving method as a base of the present invention, and a practical example of driving 128 LEDs in consideration of easy understanding and current LED element performance. As described above. Here, in the present embodiment, the number of units constituting the LED matrix has been described as 128. However, the present invention is not limited to such a configuration, and is configured by the number of elements that form a matrix of an arbitrary size. be able to. However, it is advantageous that the configuration is a power of two. Apart from the description of the present embodiment, for example, a configuration including 64, 32, or 256 units can be suitably applied.

  In the present invention, the LED light-emitting element forms an LED matrix composed of a plurality of LED light-emitting elements, and the LED matrix is dynamically changed in accordance with the input AC waveform by the matrix structure change control circuit. It has a configuration that changes the LED connection structure, optimizes the applied voltage and the required voltage of the device that change sequentially, and optimizes the operation efficiency of the current control circuit, thereby minimizing losses in the control circuit and the device.

  In the example shown in FIG. 4, since the number of bits is 128, the number of necessary binary digits is 7 bits when considered in terms of binary power. In this embodiment, a method of optimizing the voltage applied to the LED for each alternating waveform voltage that changes sequentially by changing the connection structure of the LED by sequentially switching the 7-bit LED for each number of digits. It shows.

  FIG. 5 is an explanatory diagram for understanding the switch matrix operation in this embodiment. In the voltage range exceeding the maximum operating voltage, as shown in the uppermost stage in the figure, all the LED light emitting elements are switched so as to be in series. When the voltage is ½ of the maximum operating voltage, the voltage is switched so as to be ½ series. Thereafter, the matrix is switched according to the number of bits, and finally, switching is performed in parallel in the case of 1/128 of the maximum operating voltage.

  Logically, 128 LEDs can be sequentially changed to a power of 2 and the required voltage can be applied at the same time. However, since the actual operating voltage of the LED element needs to be at least 3V, The required voltage in the form of a matrix switch does not necessarily match the periodic voltage waveform of AC 100V. Therefore, optimization of matrix structure control bits is performed by performing normalization. FIG. 6 shows an example of normalization in the present embodiment, and highly efficient driving is realized by such normalization.

  FIG. 7 is a conceptual diagram showing the AC voltage and state (states 2 to 6) after practical normalization, the switch timing of the LED array matrix, and the waveform synchronization pattern. Such normalization is necessary to determine the matrix structure switching method and the number of wirings on the substrate for practical use. As an operating mechanism, the LED matrix is dynamically deformed according to the operating state corresponding to the changing voltage of the AC power supply, and at the same time, the LED current required for the operating state according to the applied voltage of the LED element that changes sequentially. Also controls the value.

  FIG. 8 is a diagram for explaining an array shape change pattern of the LED array matrix. All LEDs can be lit at any operating voltage by switching the LED array matrix in series or parallel. The lighting device using the LED according to the present invention, the driving circuit of the lighting device using the LED, and the driving method of the lighting device using the LED are arranged in parallel with the alternating current waveform in which 128 LED array shapes are input, By changing the series structure, the applied voltage and the required voltage of the element are optimized, and the operating efficiency of the current control circuit is optimized, so that the loss (waste heat) in the control circuit and element can be minimized. .

  The lighting device using the LED according to the present invention, the driving circuit of the lighting device using the LED, and the driving method of the lighting device using the LED are all turned on when the minimum starting voltage VF of the LED is exceeded. Is possible. FIG. 6 is a diagram for explaining that all the LEDs can be turned on when all LEDs exceed the minimum activation voltage VF of the LEDs. Since the portion where the AC voltage is low is paralleled, it can be lit from a low voltage. Further, since all the LEDs are always lit, there is an advantage that no flicker occurs unlike a general capacitorless system.

  FIG. 9 is a conceptual diagram showing a functional block diagram of a drive circuit of a lighting device using LEDs according to the present invention. In the present invention, the LED light-emitting element forms an LED matrix composed of a plurality of LED light-emitting elements, and the LED matrix is dynamically changed in accordance with the input AC waveform by the matrix structure change control circuit. It has a configuration in which the LED connection structure is changed, and the applied voltage and the required voltage of the element that change sequentially are optimized, and the operation efficiency of the current control circuit is optimized. The present invention includes a constant current control circuit in which the current applied to each LED light emitting element is constant regardless of changes in the LED connection structure. As the collective control constant current control circuit, a constant current circuit including a constant current element (CRD), a field effect transistor (FET), and a bipolar transistor is preferably used.

  Here, in the series of explanations, the number of units constituting the LED matrix has been explained as 128. However, the present invention is not limited to such a configuration, and the number of elements that form a matrix of an arbitrary size is used. be able to. In other words, the LED connection structure may be configured by an LED light emitting element having a combination structure that can have an equivalent electrical load characteristic. However, as described above, it is advantageous in terms of circuit configuration to make the configuration a power of 2. In addition to the description of the present embodiment, for example, a configuration including 64 units, 32 units, or 256 units can be preferably applied.

  The configuration shown in FIGS. 1 to 3 according to the present embodiment optimizes the sequentially applied voltage and the required voltage of the element, and optimizes the operation efficiency of the current control circuit, thereby reducing the loss in the control circuit and the element. A lighting device using LEDs characterized in that the connection structure pattern to be changed is set in advance when the LED connection structure is changed, and is set in advance. AC power applied to the light emitting element in accordance with a control signal supplied from the connection structure change control circuit to the connection mechanism corresponding to the preset connection structure pattern. By changing the LED connection structure to a form suitable for the waveform, loss heat generation due to the ON resistance of the switch element is reduced, and the operating energy efficiency of the current control circuit is optimized. Lighting device was obtained.

  FIG. 10 is a diagram for explaining an example in which the configuration according to the present invention is integrated using semiconductor technology. By using the semiconductor technology in this way, it is possible to obtain a lighting device that has a very simple configuration, is compact and highly efficient, and relatively reduces losses in the control circuit and elements.

  The lighting device using the LED according to the present invention can achieve stable light emission that solves the problems of flicker and dark time with a simple configuration, and eliminates the need for a smoothing capacitor after rectification and a large-capacity electrolytic capacitor for a switching regulator. The control circuit can be manufactured at low cost and long-term reliability is improved, and the applied voltage and the required voltage of the device that are effectively sequentially changed are optimized, and the operating energy efficiency of the current control circuit is optimized. In addition, it is possible to provide an illuminating device using an LED that is characterized by minimizing loss in the element and reducing high-frequency noise, and it can be said that the industrial utility value is great.

DESCRIPTION OF SYMBOLS 1 Connection mechanism corresponding to preset connection structure pattern 2 Connection structure change control circuit 3 Switch element which comprises connection structure change control circuit

Claims (18)

A plurality of LED light emitting elements and an LED driving circuit for driving the LED light emitting elements are provided.
The LED light emitting element forms an LED connection structure composed of a plurality of LED light emitting elements,
The LED connection structure has a configuration in which the LED circuit structure change control circuit dynamically changes the LED connection circuit structure corresponding to the input AC waveform,
Lighting using LEDs characterized by relatively reducing losses in the control circuit and elements by optimizing the sequentially applied voltage and the required voltage of the element and optimizing the operation efficiency of the current control circuit A device,
In changing the LED connection circuit structure, the connection structure pattern to be changed in advance is set,
And having a connection mechanism corresponding to the preset connection circuit structure pattern,
In accordance with a control signal supplied from the connection circuit structure change control circuit to a connection mechanism corresponding to the preset connection circuit structure pattern, the LED connection circuit structure is in a form suitable for the AC power waveform applied to the light emitting element. A lighting device characterized in that, by changing, loss heat generation due to the on-resistance of the switch element is reduced, and the operating energy efficiency of the current control circuit is optimized to improve the power supply efficiency.
The connection circuit structure change control circuit is:
The circuit structure of the light emitting device structure is dynamically changed and controlled in response to a control signal input,
The lighting device according to claim 1. The light emitting element, the connection mechanism corresponding to the preset connection circuit structure pattern, and the connection circuit structure change control circuit are formed in the vicinity of each other,
The light emitting element, the connection mechanism corresponding to the preset connection circuit structure pattern, and the connection circuit structure change control circuit can be electrically connected to each other by a multi-layer conductor on the substrate. The substrate bonded by the structure capable of connecting to the substrate is integrated by a semiconductor process,
The lighting device according to claim 1. The control circuit for circuit structure change is
It is constituted by a switching element,
The lighting device according to any one of claims 1 to 3. The switching element is a transistor,
The lighting device according to claim 4. The transistor
It is any one of MOSFET, JFET, or bipolar transistor configured by a semiconductor structure,
The lighting device according to claim 5. The connection mechanism corresponding to the preset connection circuit structure pattern is:
Using a semiconductor, metal, or transparent conductive material that is selectively formed on the substrate substrate,
It is characterized in that the electrical connection is composed of multiple layers,
The illumination device according to any one of claims 1 to 6. The LED connection structure is composed of LED light emitting elements of the power of 2;
The circuit structure change control in the LED connection circuit structure is divided into light emitting units constituted by light emitting element groups having a power of 2 smaller than the total number of light emitting elements,
The connection mechanism corresponding to the preset connection circuit structure pattern for changing the connection circuit configuration of the light emitting element, and the connection circuit structure change control circuit, the connection circuit structure pattern corresponding to the applied control signal input Characterized by dynamically changing,

The lighting device according to any one of claims 1 to 7. The LED connection structure is composed of LED light emitting elements having a combination structure that can have equivalent electrical load characteristics,
The circuit structure change control in the LED connection circuit structure is divided into light emitting units constituted by a light emitting element group of a combination structure that can have an equivalent electrical load characteristic smaller than the total number of light emitting elements,
The connection mechanism corresponding to the preset connection circuit structure pattern for changing the connection circuit configuration of the light emitting element, and the connection circuit structure change control circuit, the connection circuit structure pattern corresponding to the applied control signal input Characterized by dynamically changing,
The lighting device according to any one of claims 1 to 7. The connection circuit structure change control circuit is:
Corresponding to the alternating-current power voltage waveform that changes sequentially, the matrix structure change control signal is determined to an optimum value by always performing a comparison with a normalized reference voltage,
The lighting device according to claim 8 or 9. The lighting device
According to the dynamic LED connection circuit structure change in the voltage applied to each LED light emitting element, it is characterized by comprising a constant current control circuit that can be dynamically changed to a preset specified value,
The illumination device according to any one of claims 8 to 10. The constant current control circuit is:
Regardless of the applied voltage, the feedback circuit dynamically performs constant current control,
The lighting device according to claim 11. The constant current control circuit is:
It is arranged as a constant current control circuit for each light emitting unit of the LED connection structure,
The lighting device according to claim 11 or 12. An illumination device using the light emitting element according to any one of claims 1 to 12,
A power supply unit that supplies a full-wave rectified or both-wave rectified pulsating current from a commercial power supply to the LED connection circuit structure, a synchronous waveform filter that generates a synchronous signal for the waveform of the input commercial power supply,
An operation state comparison detector for determining an operation state according to a signal from the synchronous waveform filter;
The circuit structure changing switch element that dynamically changes the connection circuit structure of the LED matrix array to an arbitrary or optimum state, a structure determining conductor pattern, and a matrix array structure changing control circuit are provided. ,
An illumination device using the light emitting element according to claim 1. The synchronous waveform filter is
It is connected to the power supply unit that supplies full-wave rectification or both-wave rectification pulsating current from the commercial power supply to the LED connection structure,
Obtaining a filtered signal from the pulsating flow;
Output to an operation state comparison detector for determining an operation state,
The lighting device according to claim 14. The power supply unit that supplies the pulsating current that is full-wave rectified or both-wave rectified from the commercial power supply to the LED connection structure and the synchronous waveform filter is a bridge rectifier,
The bridge rectifier outputs full-wave rectified or both-wave rectified pulsating current from a commercial power supply to both the LED connection structure and the synchronous waveform filter.
The lighting device according to claim 14 or 15. The power supply unit that supplies the pulsating current that is full-wave rectified or both-wave rectified from the commercial power supply to the LED connection structure and the synchronous waveform filter is a bridge rectifier,
The bridge rectifier is a first bridge rectifier that outputs a full-wave rectified or double-wave rectified pulsating current from a commercial power supply to the LED connection structure, and a full-wave rectified or double-wave rectified pulsating current from a commercial power supply to the synchronous waveform filter. A second bridge rectifier for outputting,
The illuminating device using LED as described in any one of Claims 14 thru | or 16. The lighting device
Including a state control current look-up table for controlling a control element for circuit structure change by a constant current control circuit capable of dynamically changing a set value;
A step-by-step constant current control by a constant current control circuit is performed by a lookup table that holds the normalized voltage and current relationship and an alternating voltage comparison that changes sequentially.
The lighting device according to any one of claims 14 to 17.