JP2017103193A - Illumination device using led, and drive circuit for illumination device using led - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device using an LED which obtains is capable of obtaining stable light emission and reducing the number of components, can be manufactured at low cost, improves long-term reliability and reduces power consumption, and a drive circuit for the illumination device using the LED.SOLUTION: An illumination device using the LED comprises a plurality of LED light-emitting elements and an LED drive circuit for driving the LED light-emitting elements. The LED drive circuit efficiently stabilizes a drive current to be supplied to the LED light-emitting elements and makes reliability and cost compatible by suppressing capacitor capacity to be used. The LED drive circuit includes a configuration in which a plurality of stabilization circuits is connected in parallel, and supplies output from the plurality of stabilization circuits including portions connected in parallel through a constant current control circuit to the LED light-emitting elements. Therefore, stable light emission can be obtained by removing ripple, and the reliability and the cost are made compatible by suppressing the capacitor capacity to be used.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an illumination device using an LED and a drive circuit for the illumination device using an LED.

  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.

  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 flow 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 LED has a predetermined voltage for lighting (lighting voltage) and a predetermined current (lighting current), and it is necessary to apply a current / voltage satisfying these conditions. Therefore, it is necessary to perform AC / DC conversion to smooth the pulsating current waveform to a predetermined voltage.

  In a general LED lighting device, the above pulsation waveform is made as close as possible to a direct current, and an LED driving circuit having a capacitor for accumulating electric power is used so that the pulsation waveform can be always lit even during a commercial power supply idle period. It is the mainstream to drive the LED element with a waveform that always emits light without blinking of the LED by the direct current voltage. However, this DC circuit requires a large capacity capacitor using a chemical reaction with a short life in order to realize good stability and uninterrupted light emission. The problem was that it led to a decline.

  The direct current drive method is a method in which alternating current is once converted into a smooth direct current voltage, and the LED is driven by a predetermined level of direct current. An AC / DC converter circuit used for converting an AC power source into a DC power source, that is, a power source circuit that performs a switching operation in a so-called inverter circuit, has a large number of elements, a complicated circuit, and a high cost. In this case, the rectifier circuit requires a large-capacity capacitor such as an electrolytic capacitor and a 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, in Japanese Patent Application Laid-Open No. 2004-260260, the power consumption generated in the constant current driving circuit during LED light emission driving is suppressed and reduced, and stable and normal operation of the constant current driving circuit is realized. And a headroom voltage monitoring circuit having a LED array, an LED driver IC, a DC-DC converter, a first feedback circuit composed of a voltage dividing resistor, a controller and a second feedback circuit, As for the feedback circuit 2, a form has been proposed in which the headroom voltage obtained at the current terminal of the LED driver IC is fed back to the DC-DC converter.

JP 2009-283542 A

    The three-dimensional structure can improve the direct current stability, and the circuit constant can be reduced by improving the performance. As a result, the number of parts can be reduced, and it can be manufactured at low cost, and the reliability is high. At the same time, there is a need for an LED driving circuit and an LED lighting device that can achieve stable light emission that solves the problems of flicker and dark time, and realizes low power consumption and long life.

    The present invention solves these problems, obtains stable light emission with a simple configuration, can reduce the number of components, can be manufactured at low cost, improves long-term reliability, and reduces power consumption. It is an object of the present invention to provide a lighting device using an LED and a driving circuit for the lighting device using the LED.

    By reducing the number of parts at the same time, the present invention can reduce the board size and make the entire lighting device compact, and by improving the performance, simple parts can be used, reducing the product cost and reducing the cost. It is intended to provide a lighting device using an LED that contributes to the above and a driving circuit for the lighting device using the LED.

    Furthermore, the present invention has a three-dimensional configuration and can enjoy the advantages of a redundant structure, and since fault tolerance is exhibited, functional operation continues even if some circuits stop during long-term continuous use. Therefore, it is an object of the present invention to provide an illumination device using an LED that contributes to improving reliability over a long period of time and a drive circuit for the illumination device using an LED.

    The present invention includes a plurality of LED light-emitting elements and an LED drive circuit that drives the LED light-emitting elements. The LED drive circuit efficiently stabilizes the drive current supplied to the LED light-emitting elements and suppresses the capacitor capacity to be used. The LED driving circuit includes a configuration in which a plurality of stable circuits are connected in parallel, and outputs from the plurality of stable circuits including the parallel-connected portions are constant current control circuits. By using the LED, it is possible to obtain stable light emission with ripples removed by supplying to the LED light-emitting element via the capacitor, and to reduce the capacitor capacity to be used and to achieve both reliability and cost. It is the drive circuit of the illuminating device and the illuminating device which used LED.

    Further, the present invention is an illumination device using an LED and an illumination device drive circuit using an LED, wherein the LED drive circuit is configured by connecting and connecting a plurality of stable circuits in a matrix. . Further, the matrix of the plurality of stable circuits included in the LED driving circuit is characterized in that the plurality of stable circuits constituting the matrix includes at least a plurality of rows and / or a plurality of columns.

Further, the present invention includes a configuration in which the plurality of stable circuits included in the LED driving circuit includes a plurality of stable circuits connected in parallel, and further, units connected in parallel and / or units connected in series are mixed. An illumination device using an LED and a drive circuit for the illumination device using an LED, including a configuration.

Furthermore, the invention is characterized in that the stabilization circuit used in the LED drive circuit is a switching regulator. Further, the stabilization circuit used in the LED driving circuit is a switching regulator, and the control method is any one of a voltage mode, a current mode, and a hysteresis control. Alternatively, the stabilization circuit used in the LED driving circuit is a switching regulator, and its operation method is either a pulse frequency modulation method or a pulse width modulation method. Alternatively, the ballast circuit used in the LED driving circuit is a switching regulator, and the switching regulator includes a chopper type ballast.

    Further, the present invention is a lighting device using an LED and a driving circuit for the lighting device using an LED, wherein the stabilization circuit used in the LED driving circuit is a linear regulator.

    Further, the present invention provides a constant current control circuit used in the LED driving circuit that outputs a constant current by changing an operating resistance of a switch by a load resistance so that a voltage drop across the current detection resistor is constant. An illumination device using an LED and a drive circuit for the illumination device using an LED, characterized by being a constant current control circuit.

    In the present invention, the constant current control circuit used in the LED driving circuit outputs a constant current by changing the operating resistance of the variable resistor by a feedback circuit so that the voltage drop across the current detection resistor is constant. An illumination device using an LED and a drive circuit for the illumination device using an LED, which are a linear constant current control circuit.

    The present invention also provides a lighting device using an LED and a driving circuit for the lighting device using an LED, wherein the resistance value in the constant current control circuit used in the LED driving circuit is controlled by a transistor. is there. Further, the transistor used in the constant current control circuit used in the LED drive circuit is any one of an FET transistor, a bipolar transistor, or an IGBT.

    Further, the present invention is characterized in that the plurality of ballast circuits of the LED driving circuit includes a portion where the ballast circuits are arranged and connected in parallel and a portion where the ballast circuits are arranged and connected in series. It is the drive circuit of the illuminating device using LED, and the illuminating device using LED.

  The illumination device using the LED and the drive circuit of the illumination device using the LED according to the present invention efficiently stabilize the drive current supplied to the LED light-emitting element, and suppress the capacitor capacity to be used, thereby reducing the reliability and cost. By supplying the output from a plurality of stable circuits including parts connected in parallel to the LED light-emitting element via a constant current control circuit, ripples are eliminated and stable light emission is obtained. In addition, the present invention provides an illumination device using an LED and a drive circuit for the illumination device using an LED, which can reduce the capacitor capacity used and achieve both reliability and cost.

FIG. 1 is a conceptual diagram for explaining functions of an illumination device using an LED according to the present invention and a drive circuit used therefor.

  Hereinafter, a lighting device using an LED and a driving circuit of the lighting device using the LED according to the present invention will be described with reference to the drawings.

FIG. 1 is a conceptual diagram for explaining functions of an illumination device using an LED according to the present invention and a drive circuit used therefor. The present invention relates to an illumination device using an LED and a drive circuit used for the illumination device, and includes a plurality of LED light emitting elements and an LED drive circuit for driving the LED light emitting elements, and the LED drive circuit supplies the LED light emitting elements. The LED drive circuit includes a configuration in which a plurality of stable circuits are connected in parallel, the current being efficiently stabilized, and a capacitor capacity to be used is suppressed to achieve both reliability and cost. By supplying the output from a plurality of stable circuits including the selected portion to the LED light-emitting element through a constant current control circuit, stable light emission can be obtained without ripples, and the capacitor capacity to be used can be suppressed and reliable. It is characterized by being able to achieve both performance and cost.

  In this embodiment, as conceptually shown in FIG. 1, a plurality of stabilizing circuits included in the LED driving circuit are arranged and connected in a matrix. Here, the matrix of the plurality of stable circuits included in the LED drive circuit is configured such that the plurality of stable circuits constituting the matrix includes at least a plurality of rows and / or a plurality of columns.

  Specifically, in the present embodiment, a plurality of stable circuits are connected in parallel (three rows are formed), and the columns include three columns. With this configuration, the load required for each stable circuit can be reduced, and the capacitor capacity to be used can be suppressed, thereby improving reliability and reducing costs at the same time.

  Note that a matrix with multiple stable circuits is more effective in eliminating ripple and reducing capacitor capacity as the number of elements increases in both matrices, but it also increases costs, so it is important to select a good number of elements by taking these factors into account. good.

  Here, it has been practiced to reduce the capacitor capacity to be used by using a plurality of stable circuits to achieve both reliability and cost. However, the configuration is exclusively connected by connecting a plurality of stable circuits in series. It was only reduced. By including a configuration in which at least a plurality of stable circuits according to the present invention are connected in parallel, ripples can be removed more effectively and stable light emission can be obtained, and the capacitance of the capacitors used can be suppressed and reliability and cost can be reduced. It became possible to achieve both.

    In the present invention, these problems are solved, stable light emission can be obtained with a simple configuration, the number of parts can be reduced, manufacturing can be performed at low cost, long-term reliability is improved, and low It was possible to provide a lighting device using an LED that achieves power consumption and a driving circuit for the lighting device using the LED.

    In addition, the present invention can reduce the board size by reducing the number of parts at the same time, and can make the whole lighting device compact, and by using high performance, simple parts can be used and the product cost can be reduced. It was possible to provide a lighting device using an LED that contributes to down and a driving circuit of the lighting device using the LED.

    Furthermore, the present invention can continue functional operation even if some circuits are stopped during continuous use over a long period of time, and therefore an illumination device using an LED that contributes to improving reliability over a long period of time and The drive circuit of the illuminating device using LED could be provided.

  In this embodiment, a switching regulator is used as a stable circuit used in the LED driving circuit, its control method is a voltage mode, and its operation method is a pulse frequency modulation method. Here, when a switching regulator is used as a stabilizing circuit used in the LED driving circuit, any one of a voltage mode, a current mode, and a hysteresis control is suitably used as the control method, and the operation method is a pulse frequency modulation method or Any of the pulse width modulation methods is preferably used. Further, the switching regulator may include a chopper type ballast.

  In this embodiment, as a constant current control circuit used in the LED drive circuit, a constant current is obtained by changing the operating resistance of the switch by the load resistance so that the voltage drop across the current detection resistor is constant. A switching type constant current control circuit that outputs is used. Here, the constant current control circuit used in the LED drive circuit is a linear current output by changing the operating resistance of the variable resistor by a feedback circuit so that the voltage drop across the current detection resistor is constant. A type constant current control circuit is also preferably used.

  In addition, it is effective that the resistance value in the constant current control circuit used in the LED drive circuit is controlled by a transistor, and further, the transistor used in the constant current control circuit used in the LED drive circuit is an FET. Any of a transistor, a bipolar transistor, or an IGBT may be used.

  With this configuration, the lighting device using the LED and the driving circuit of the lighting device using the LED according to the present invention efficiently stabilize the driving current supplied to the LED light emitting element and suppress the capacitor capacity to be used. It is also compatible with reliability and cost. By supplying the output from a plurality of stable circuits including parts connected in parallel to the LED light emitting element via a constant current control circuit, the ripple is eliminated and stable. It was possible to provide an illuminating device using an LED and a driving circuit for the illuminating device using an LED, which can achieve both the reliability and cost by suppressing the capacitor capacity to be used.

  In the present embodiment, a linear regulator was used as a stable circuit used in the LED driving circuit with respect to the configuration of the first embodiment. The resistance value in the constant current control circuit used in the LED drive circuit was controlled using an FET transistor.

  In this embodiment, a plurality of stable circuits are connected in parallel (two rows are formed), and one column is provided. With this configuration, the load required for each stable circuit can be reduced, and the capacitor capacity to be used can be suppressed, thereby improving reliability and reducing costs at the same time.

    The illumination device using the LED according to the present invention and the drive circuit of the illumination device using the LED according to the present invention efficiently stabilize the drive current supplied to the LED light emitting element and suppress the capacitor capacity to be used. It is also compatible with reliability and cost. By supplying the output from a plurality of stable circuits including parts connected in parallel to the LED light emitting element via a constant current control circuit, the ripple is eliminated and stable. Illuminating device using an LED and a driving circuit for the illuminating device using an LED, which can achieve both reliability and cost by suppressing the capacitor capacity to be used. The availability is great.

11 Full wave rectification or synchronous rectification circuit 12, 13, 14 Stabilization circuit 15 Constant current control circuit 16 LED light emitting element

Claims (28)

An illumination device using LEDs,
A plurality of LED light emitting elements and an LED driving circuit for driving the LED light emitting elements are provided.
The LED drive circuit stabilizes the drive current supplied to the LED light-emitting element efficiently, and suppresses the capacitor capacity to be used to achieve both reliability and cost.
The LED drive circuit includes a configuration in which a plurality of stable circuits are connected in parallel,
By supplying outputs from a plurality of stable circuits including the parallel-connected portions to the LED light-emitting elements via a constant current control circuit,
Ripple is removed, stable light emission is obtained, and the capacity of the capacitor to be used can be suppressed to achieve both reliability and cost.
Lighting device using LED. The LED drive circuit
A plurality of ballast circuits are arranged and connected in a matrix form,
An illumination device using the LED according to claim 1. A matrix of a plurality of stable circuits included in the LED driving circuit is:
The plurality of ballast circuits constituting the matrix includes at least a plurality of rows and / or a plurality of columns.
An illumination device using the LED according to claim 2. The plurality of ballast circuits included in the LED driving circuit are:
A plurality of stable circuits includes a configuration in which at least a plurality of stable circuits are connected in parallel, and further includes a configuration in which units connected in parallel and / or units connected in series are mixed.
An illumination device using the LED according to claim 1. The ballast circuit used in the LED drive circuit is:
It is a switching regulator,
The illuminating device using LED as described in any one of Claims 1 thru | or 4. The ballast circuit used in the LED drive circuit is a switching regulator,
The control method is either voltage mode, current mode or hysteresis control,
An illumination device using the LED according to claim 5. The ballast circuit used in the LED drive circuit is a switching regulator,
The operation method is either a pulse frequency modulation method or a pulse width modulation method,
An illumination device using the LED according to claim 5. The ballast circuit used in the LED drive circuit is a switching regulator,
The switching regulator includes a chopper-type ballast,
The illuminating device using LED as described in any one of Claims 5 thru | or 7. The ballast circuit used in the LED drive circuit is:
It is a linear regulator,
The illuminating device using LED as described in any one of Claims 1 thru | or 4. The constant current control circuit used in the LED driving circuit is:
A constant current is output by changing the operating resistance of the switch according to the load resistance so that the voltage drop across the current detection resistor is constant.
It is a switching type constant current control circuit,
The illuminating device using LED as described in any one of Claims 1 thru | or 9. The constant current control circuit used in the LED driving circuit is:
A constant current is output by changing the operating resistance of the variable resistor using a feedback circuit so that the voltage drop across the current detection resistor is constant.
It is a linear constant current control circuit,
The illuminating device using LED as described in any one of Claims 1 thru | or 9. Control of the resistance value in the constant current control circuit used in the LED drive circuit is as follows:
It is performed by a transistor,
The illuminating device using LED of Claim 11. The transistors used in the constant current control circuit used in the LED drive circuit are:
It is one of FET transistor, bipolar transistor or IGBT,
An illumination device using the LED according to claim 12. The plurality of ballast circuits of the LED driving circuit are:
The ballast circuit is configured to include a portion in which the ballast circuit is arranged and connected in parallel and a portion in which the ballast circuit is arranged and connected in series.
The illuminating device using LED as described in any one of Claims 1 thru | or 13. A driving circuit used in an illumination device using an LED,
The LED drive circuit stabilizes the drive current supplied to the LED light-emitting element efficiently, and suppresses the capacitor capacity to be used to achieve both reliability and cost.
The LED drive circuit includes a configuration in which a plurality of stable circuits are connected in parallel,
By supplying outputs from a plurality of stable circuits including the parallel-connected portions to the LED light-emitting elements via a constant current control circuit,
Ripple is removed, stable light emission is obtained, and the capacity of the capacitor to be used can be suppressed to achieve both reliability and cost.
A drive circuit used in an illumination device using an LED. The LED drive circuit
A plurality of ballast circuits are arranged and connected in a matrix form,
The drive circuit used for the illuminating device using LED of Claim 15. A matrix of a plurality of stable circuits included in the LED driving circuit is:
The plurality of ballast circuits constituting the matrix includes at least a plurality of rows and / or a plurality of columns.
The drive circuit used for the illuminating device using LED of Claim 16. The plurality of ballast circuits included in the LED driving circuit are:
A plurality of stable circuits includes a configuration in which at least a plurality of stable circuits are connected in parallel, and further includes a configuration in which units connected in parallel and / or units connected in series are mixed.
The drive circuit used for the illuminating device using LED of Claim 15. The ballast circuit used in the LED drive circuit is:
It is a switching regulator,
The drive circuit used for the illuminating device using LED as described in any one of Claims 15 thru | or 18. The ballast circuit used in the LED drive circuit is a switching regulator,
The control method is either voltage mode, current mode or hysteresis control,
The drive circuit used for the illuminating device using LED of Claim 19. The ballast circuit used in the LED drive circuit is a switching regulator,
The operation method is either a pulse frequency modulation method or a pulse width modulation method,
The drive circuit used for the illuminating device using LED of Claim 19. The ballast circuit used in the LED drive circuit is a switching regulator,
The switching regulator includes a chopper-type ballast,
The drive circuit used for the illuminating device using LED as described in any one of Claims 19 thru | or 21. The ballast circuit used in the LED drive circuit is:
It is a linear regulator,
The drive circuit used for the illuminating device using LED as described in any one of Claims 15 thru | or 18. The constant current control circuit used in the LED driving circuit is:
A constant current is output by changing the operating resistance of the switch according to the load resistance so that the voltage drop across the current detection resistor is constant.
It is a switching type constant current control circuit,
The drive circuit used for the illuminating device using LED as described in any one of Claims 15 thru | or 23. The constant current control circuit used in the LED driving circuit is:
A constant current is output by changing the operating resistance of the variable resistor using a feedback circuit so that the voltage drop across the current detection resistor is constant.
It is a linear constant current control circuit,
The drive circuit used for the illuminating device using LED as described in any one of Claims 15 thru | or 23. Control of the resistance value in the constant current control circuit used in the LED drive circuit is as follows:
It is performed by a transistor,
The drive circuit used for the illuminating device using LED of Claim 25. The transistors used in the constant current control circuit used in the LED drive circuit are:
It is one of FET transistor, bipolar transistor or IGBT,
The drive circuit used for the illuminating device using LED of Claim 26. The plurality of ballast circuits of the LED driving circuit are:
The ballast circuit is configured to include a portion in which the ballast circuit is arranged and connected in parallel and a portion in which the ballast circuit is arranged and connected in series.
A drive circuit used for an illumination device using the LED according to any one of claims 15 to 27.