JP2015011998A - Light emitting diode illumination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting diode illumination apparatus in which an illumination lamp including a light emitting diode can be kept in a stable light emission state corresponding to an unstable voltage environment.SOLUTION: A light emitting diode illumination apparatus is disclosed which is improved so that an illumination lamp constituted by a light emitting diode keeps a stable light emission state even for changes in a voltage environment, light emission corresponding to an unstable voltage region can be made to be blinded to achieve stable illumination, and even if the rectified voltage enters the unstable voltage region, excess current consumption and heat generation can be avoided.

Description

  The present invention relates to a light-emitting diode illuminating device, and more particularly, to a light-emitting diode illuminating device improved so that an illuminating lamp including the light-emitting diode maintains a stable light-emitting state even when a voltage environment changes.

  Lighting technology has been developed with a tendency to employ light emitting diodes (LEDs) as light sources to save energy. High brightness light emitting diodes have the advantage of being differentiated from other light sources in a variety of factors such as energy consumption, lifetime and light quality. The light emitting diode has a characteristic of being driven by a constant current. Therefore, the lighting device using a light emitting diode as a light source has a problem of requiring a large number of additional circuits depending on the characteristics of the light emitting diode.

  One example developed to solve the above problem is an AC direct type light emitting diode illumination device. In general, an AC direct light-emitting diode illuminating device is designed to emit light from a light-emitting diode using a rectified voltage obtained by rectifying a commercial power supply. The rectified voltage can have a ripple with a frequency about twice that of the commercial power source.

  The AC direct type light-emitting diode illuminating device directly uses a rectified voltage as an input voltage without using an inductor and a capacitor, and thus has a characteristic that a power factor is good. The light emitting diode illumination device can be manufactured in a bulb (BULB) type, an L-tube (L-TUBE) type, or the like. A number of light emitting diodes configured as light sources in the light emitting diode illumination device may be configured in series or in parallel on the substrate.

  The light-emitting diode illuminating device can operate normally when driven in a commercial power supply environment within a design range. The light-emitting diode illuminating device may include light-emitting diodes connected in series in two or more stages, and the light-emitting diodes sequentially emit light or extinguish in accordance with the rise or fall of the rectified voltage. A current path for light emission of the light emitting diode can be formed by current regulation.

JP 2014-109784 A JP 2014-110244 A

  In order for the light emitting diode to emit light normally at each stage, the rectified voltage must rise above the level necessary for light emission, and a sufficient voltage necessary for current regulation must be formed. The voltage required for current regulation means the drain-source voltage of the switching element for forming a current path. If the voltage environment is unstable or sufficient peak voltage is not guaranteed, the LED connected in series with the final stage will not be turned on, or the current regulation for light emission of the LED connected in series with the final stage will not The necessary sufficient voltage may not be formed. As a result, the light-emitting diode illuminating device may have a problem that the light-emitting diodes connected in series in the final stage do not emit light, or the amount of current flowing through the current path is limited by insufficient voltage, resulting in reduced brightness. Due to the above problem, the light emitting diode illuminating device may not be able to secure a desired light amount, and the light emission state may become unstable.

  An object of the present invention is to provide a light-emitting diode illuminating device that can maintain a stable light emission state of an illumination lamp including a light-emitting diode in response to an unstable voltage environment.

  Another object of the present invention is to provide a light-emitting diode illuminating device that employs an auxiliary part capable of blinding light emission corresponding to an unstable voltage region and can realize stable illumination.

  Furthermore, the present invention is a light-emitting diode illumination that can maintain light emission while avoiding excessive current consumption and heat generation even when entering a voltage region where the rectified voltage is unstable, and can realize stable illumination. Another object is to provide an apparatus.

  The light-emitting diode illuminating device according to the present invention includes one or more first light-emitting diodes, and is connected to the illuminating lamp that emits light by a rectified voltage in series with the illuminating lamp. It includes an auxiliary unit that receives a surplus voltage, and a current control circuit that provides at least a current path for light emission of the illuminating lamp.

  Therefore, according to the present invention, an auxiliary unit that provides a current path corresponding to an unstable voltage region including the peak value of the rectified voltage is employed, and the light emission of the auxiliary unit is blinded, thereby causing an unstable voltage. There is an effect that stable lighting corresponding to the area can be guaranteed.

  In addition, according to the present invention, even if the rectified voltage enters an unstable voltage region, there is an effect that stable illumination can be ensured while avoiding excessive current consumption and heat generation by the action of the auxiliary unit.

It is a circuit diagram which shows preferable embodiment of the light emitting diode illuminating device concerning this invention. FIG. 2 is an exploded perspective view illustrating that the light-emitting diode illuminating device of FIG. 1 is configured in a bulb shape. FIG. 3 is a schematic side view of the substrate of FIG. 2. It is a wave form diagram explaining operation | movement of embodiment of FIG. It is a circuit diagram which shows other embodiment of the light emitting diode illuminating device concerning this invention. It is a circuit diagram which shows another example of an illumination lamp and an auxiliary | assistant part.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Terms used in the specification and claims are not to be interpreted in a normal or lexical sense, but must be construed in a meaning and concept consistent with the technical matter of the invention.

  The embodiments described in the present specification and the configurations shown in the drawings are preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. There can be a variety of equivalents and variations.

  The embodiment according to the present invention discloses a light-emitting diode illuminating device driven by an AC direct method. Embodiments according to the present invention use a rectified voltage for light-emitting diode illumination in an AC direct manner. The rectified voltage means a voltage having a characteristic that the AC voltage is subjected to radio wave rectification, and the voltage level repeatedly rises and falls every half cycle of the AC voltage. In the embodiment according to the present invention, the rise or fall of the rectified voltage can be understood to mean the rise or fall of the ripple of the rectified voltage.

  As shown in FIG. 1, the embodiment according to the present invention includes a power supply unit, an illumination lamp 12, an auxiliary unit 16, and a current control circuit.

  The power supply part comprised by embodiment concerning this invention provides the rectified voltage into which the alternating voltage was converted. The power supply unit can include an AC power supply VAC that provides an AC voltage and a rectifier circuit 10 that rectifies the AC voltage and outputs a rectified voltage. Here, the AC power supply VAC may be a commercial power supply. The rectifier circuit 10 rectifies an AC voltage having a sine wave waveform by radio wave and outputs it as a rectified voltage.

  As shown in FIG. 1, the illuminating lamp 12 may include a plurality of light emitting diodes. FIG. 1 shows that the illuminating lamp 12 includes four light emitting diodes LED1, LED2, LED3, and LED4 connected in parallel. Illustrate. The illuminating lamp 12 of FIG. 1 is merely illustrative of an embodiment, and may include light emitting diodes connected in series, parallel, or series-parallel in various numbers depending on the manufacturer's intention. Further, the illuminating lamp 12 may include multi-stage light emitting diodes connected in series as shown in FIG. 5 described later according to the intention of the manufacturer. In this case, various numbers of light emitting diodes are included in each stage. Good.

  The auxiliary unit 16 is connected to the illuminating lamp 12 in series. The auxiliary unit 16 may be configured by an element capable of providing a current path for maintaining light emission while avoiding excessive current consumption and heat generation even when entering the voltage region where the rectified voltage is unstable. As described above, the light emitting diode LEDB may be used.

  The light emitting diode LEDB configured as the auxiliary unit 16 is preferably configured so that the light emission is blinded as shown in FIGS. The auxiliary unit 16 in FIG. 1 is merely an example of the embodiment, and may be configured as two parallel-connected light emitting diodes connected in series in two groups as shown in FIG. Although not specifically shown, the auxiliary unit 16 may include a plurality of series-connected light emitting diodes according to the intention of the manufacturer. In this case, various numbers of light emitting diodes are included in each stage. Good. That is, the auxiliary unit 16 may include two or more light emitting diodes that are connected in series, in parallel, or in series and parallel depending on the intention of the manufacturer.

  In addition to the light emitting diode, the auxiliary unit 16 can be implemented in various ways using an active element that performs switching corresponding to voltage rise or fall, or a passive element having a low resistance value.

  The embodiment according to the present invention may include a current control circuit, and the current control circuit may be configured to include a current control unit 14 and a current sensing resistor Rs.

  The illuminating lamp 12 and the auxiliary unit 16 sequentially emit or extinguish in response to the rise or fall of the rectified voltage, and the current control unit 14 includes the light emitting diodes LED1, LED2, LED3, LED4 and the auxiliary unit 16 of the illuminating lamp 12. The light emitting diode LEDB may include a current regulator that performs current regulation so as to provide a current path for light emission.

  In order to explain the operation of the embodiment of the present invention, the rectified voltage for causing the light emitting diodes LED1, LED2, LED3, and LED4 of the illuminating lamp 12 to emit light is defined as the light emitting voltage Vf1, and the light emitting diode LEDB of the auxiliary unit 16 emits light. The rectified voltage is defined as the light emission voltage Vf2. The light emission voltage Vf2 is higher than the light emission voltage Vf1. In the embodiment of FIG. 1, a voltage component higher than the light emission voltage Vf1 among the rectified voltage transmitted to the auxiliary unit 16 can be defined as a surplus voltage.

  The current control unit 14 includes a switching circuit 30_1 that provides a current path for the light emitting diodes LED1, LED2, LED3, and LED4 of the illuminating lamp 12, a switching circuit 30_2 that provides a current path for the light emitting diode LEDB of the auxiliary unit 16, and a reference voltage. And a reference voltage supply unit 32 for providing VREF1 and VREF2.

  The switching circuits 30_1 and 30_2 are commonly connected to a current sensing resistor Rs that provides a current sensing voltage for current regulation and formation of a current path.

  The switching circuits 30_1 and 30_2 compare the current sensing voltage sensed by the current sensing resistor Rs with the respective reference voltages VREF1 and VREF2 of the reference voltage supply unit 32, and select a current path for light emission of the illumination lamp 12. Form.

  Each of the switching circuits 30_1 and 30_2 includes a comparator 50 and a switching element, and the switching element is preferably composed of an NMOS transistor 52.

  The comparator 50 of each of the switching circuits 30_1 and 30_2 has a reference voltage applied to the positive input terminal (+), a current sensing voltage applied to the negative input terminal (−), and a reference voltage and a current sensing voltage applied to the output terminal. The comparison result is output.

  The NMOS transistors 52 of the switching circuits 30_1 and 30_2 perform a switching operation according to the output of each comparator 50 applied to the gate. The drain of the NMOS transistor 52 and the negative input terminal (−) of the comparator 50 are commonly connected to the current sensing resistor Rs.

  The current sensing voltage formed in the current sensing resistor Rs by the above configuration is applied to the input terminal (−) of the comparator 50, and the current sensing resistor Rs is one of the NMOS transistors 52 of the switching circuits 30_1 and 30_2. It can be used to form a current path corresponding to one turn-on.

  The reference voltage supply unit 32 provides two reference voltages VREF1 and VREF2. The reference voltage supply unit 32 can be realized as providing reference voltages VREF1 and VREF2 having different levels according to the intention of the manufacturer.

  The reference voltage supply unit 32 includes, for example, a plurality of resistors (not shown) connected in series to which a constant voltage is applied, and outputs reference voltages VREF1 and VREF2 having different levels for each node between the resistors. May be configured. Further, unlike the above, the reference voltage supply unit 32 may be configured to include independent voltage supply sources (not shown) that provide reference voltages VREF1 and VREF2 at different levels.

  Of the reference voltages VREF1 and VREF2, the reference voltage VREF1 can have a low voltage level and the reference voltage VREF2 can have a high voltage level.

  Here, the reference voltage VREF1 has a level for turning off the switching circuit 30_1 when the light emitting diode LEDB of the auxiliary unit 16 emits light. More specifically, the reference voltage VREF1 may be set to a level lower than the current sensing voltage formed in the current sensing resistor Rs when the light emitting diode LEDB emits light.

  The reference voltage VREF2 is set so that the switching circuit 30_2 is kept turned on in the normal state, and the current flowing through the current sensing resistor Rs is in a predetermined constant current form in the upper limit level region of the rectified voltage emitted from the light emitting diode LEDB. It is preferred that In addition, the reference voltage VREF2 may be set to have a level for preventing overvoltage. In this case, the switching circuit 30_2 is turned off when a current sensing voltage is applied at a level higher than the reference voltage VREF2. Light emission due to overvoltage can be blocked.

  In the embodiment of FIG. 1, the current control unit 14 can be realized with one chip, and is exemplified as having a channel that provides two current paths. However, according to the manufacturer's intention, the illuminating lamp 12 may include light emitting diodes divided into two or more groups connected in series, and correspondingly, the current control unit 14 includes the illuminating lamp 12. Can include more than one channel for providing a current path. In this case, the auxiliary unit 16 may be configured such that any one of the light emitting diode groups is selected.

  Further, when the illuminating lamp 12 or the illuminating lamp 12 and the auxiliary unit 16 are divided into a group having a number smaller than the number of channels provided by the current control unit 14, the illuminating lamp 12, or the illuminating lamp 12 and the auxiliary unit 16 The channel for this may be selected from those provided by the current controller 14.

  On the other hand, the embodiment according to the present invention configured as shown in FIG. 1 may be configured as a valve type as shown in FIG.

  Referring to FIG. 2, the embodiment according to the present invention includes a cap 100 and a base 102, and the cap 100 has a translucent material such as glass or quartz, and is configured in a hemispherical shape. The base 102 may have a structure in which an inlet is formed at one end and a connection portion 104 that can be coupled to a power socket is formed at the other end. The cap 100 may have a structure that can be coupled to the inlet of the base 102 by an interference fit or a screw coupling. Hereinafter, the valve-type case can be defined as including the base 102.

  The light emitting diodes LED 1, LED 2, LED 3, LED 4 forming the illumination lamp 12 are arranged on one surface of the illumination board 110, and the illumination board 110 is coupled to the entrance of the base 102. At this time, the illumination board 110 is disposed such that the surface on which the light emitting diodes LED1, LED2, LED3, and LED4 are arranged faces the hemispherical cap 100.

  The light emitting diode LEDB that forms the auxiliary unit 16 may be configured on the illumination substrate 110 and may be disposed on the same surface as the light emitting diodes LED1, LED2, LED3, and LED4. In this case, the light emitting diode LEDB may be blinded using a light shielding member (not shown). As the light emitting diode LEDB forming the auxiliary portion 16 is blinded in this way, the light emission of the light emitting diode LEDB does not affect the illumination.

  Further, in the embodiment according to the present invention, the light emitting diode LEDB of the auxiliary unit 16 is configured on the illumination board 110 like the light emitting diodes LED1, LED2, LED3, and LED4 of the illuminating lamp 12, but opposite to each other as shown in FIG. You may comprise as what is arrange | positioned on the surface of a side. In this case, the light emitting diode LEDB is mounted so as to face the inside of the base 102, and the light emission of the light emitting diode LEDB does not affect the illumination.

  Furthermore, the embodiment according to the present invention may be configured such that the light emitting diode LEDB of the auxiliary portion 16 is disposed in an inner space formed by the illumination board 110 and the base 102.

  At this time, another substrate 112 can be used for mounting the light emitting diode LEDB, and the substrate 112 is electrically connected through the illumination substrate 110 and the wiring 114 to provide a rectified voltage or perform current regulation. You may comprise as what mounts the components to perform.

The operation of the embodiment of the present invention configured as described above will be described with reference to FIG.
In FIG. 4, “CH1” means a section in which the light emitting diodes LED1, LED2, LED3, and LED4 of the illumination lamp 12 emit light by a rectified voltage having a level equal to or higher than the light emission voltage Vf1, and “CH2” indicates a light emission voltage Vf2 or higher. The light emitting diode LEDB of the auxiliary unit 16 emits light by a rectified voltage having a level of.

  The rectified voltage has a waveform in which a ripple that gradually increases from an initial level lower than the light emission voltage Vf1 to an upper limit level higher than the light emission voltage Vf2, and then returns to the initial level from the upper limit level is repeatedly formed.

  In a state where the rectified voltage has a level lower than the light emission voltage Vf1, the light emitting diodes LED1, LED2, LED3, LED4 of the illumination lamp 12 and the light emitting diode LEDB of the auxiliary unit 16 do not emit light, and the current sensing resistor Rs has a low level. Current sensing voltage is formed.

  At this time, the switching circuits 30_1 and 30_2 of the current control unit 14 have the reference voltages VREF1 and VREF2 applied to the positive input terminal (+) higher than the current sensing voltage applied to the negative input terminal (−). Both remain turned on.

  When the rectified voltage rises and reaches the light emission voltage Vf1, the light emitting diodes LED1, LED2, LED3, and LED4 of the illumination lamp 12 emit light, and the current path for light emission is a switching circuit in a state where the current control unit 14 is turned on. Provided by 30_1. That is, the current path is formed through the switching circuit 30_1 and the current sensing resistor Rs, and current flows through the switching circuit 30_1 and the current sensing resistor Rs due to the current regulation of the switching circuit 30_1.

  The level of the current sensing voltage of the current sensing resistor Rs increases due to the current flow through the switching circuit 30_1 of the current control unit 14. However, at this time, since the current sensing voltage is at a level lower than the reference voltage VREF1, the turn-on state of the switching circuits 30_1 and 30_2 of the current control unit 14 is not changed.

  Thereafter, the rectified voltage rises and the currents at the output terminals of the light emitting diodes LED1, LED2, LED3, and LED4 of the illuminating lamp 12 increase, and the switching circuit 30_1 of the current control unit 14 exceeds the limit value of the current that can be kept on. Then, the switching circuit 30_1 of the current control unit 14 is turned off by the current sensing voltage that is increased by the current sensing resistor Rs.

  At this time, the voltage at the input terminal of the light emitting diode LEDB of the auxiliary unit 16 reaches the light emitting voltage Vf2, and the light emitting diode LEDB emits light using the switching circuit 30_2 of the current control unit 14 as a current path. At this time, the light emitting diodes LED1, LED2, LED3, and LED4 of the illumination lamp 12 also maintain the light emitting state.

  The turn-off of the switching circuit 30_1 of the current control unit 14 is due to an increase in the level of the current sensing voltage of the current sensing resistor Rs. That is, as described above, when the rectified voltage reaches the light emission voltage Vf2 and the light emitting diode LEDB of the auxiliary unit 16 emits light, current sensing is performed by the current flow through the switching circuit 30_2 of the current control unit 14 that provides a current path. The level of the current sensing voltage of the resistor Rs increases.

  At this time, the level of the current sensing voltage is higher than the reference voltage VREF1. Therefore, the NMOS transistor 52 of the switching circuit 30_1 of the current control unit 14 is turned off by the output of the comparator 50. That is, the switching circuit 30_1 of the current control unit 14 is turned off, and the switching circuit 30_2 of the current control unit 14 provides a selective current path corresponding to the light emission of the light emitting diode LEDB of the auxiliary unit 16.

  Thereafter, even if the rectified voltage continues to rise, the reference voltage VREF2 provided to the switching circuit 30_2 of the current control unit 14 is higher than the current sensing voltage formed in the current sensing resistor Rs by the upper limit level of the rectified voltage. Therefore, the switching circuit 30_2 of the current control unit 14 maintains the turn-on state.

  As described above, when the illuminating lamp 12 and the auxiliary unit 16 sequentially emit light corresponding to the rise in the rectified voltage, the turn-on current corresponding to the light emission state also increases stepwise as shown in FIG.

  As described above, the rectified voltage starts to decrease after increasing to the upper limit level.

  When the rectified voltage drops below the light emission voltage Vf2, the light emitting diode LEDB of the auxiliary unit 16 is difficult to maintain light emission. At this time, the switching circuit 30_1 of the current control unit 14 is turned on when the current sensing voltage of the current sensing resistor Rs decreases. Therefore, the current path is formed by the switching circuit 30_1 of the current control unit 14, the light emitting diode LEDB of the auxiliary unit 16 is extinguished, and the light emission by the light emitting diodes LED1, LED2, LED3, and LED4 of the illumination lamp 12 is maintained.

  Thereafter, when the rectified voltage continues to decrease and falls below the light emission voltage Vf1, the light emitting diodes LED1, LED2, LED3, and LED4 of the illumination lamp 12 are extinguished.

  As described above, the embodiment according to the present invention sequentially emits and extinguishes the light emitting diodes included in the illumination lamp 12 and the auxiliary unit 16 in response to the rise and fall of the rectified voltage. It is possible to control current regulation and current path formation corresponding to quenching.

  In the embodiment according to the present invention described above, the peak value of the rectified voltage is 110V, the voltage necessary for the light emission of the illumination lamp 12 is set to 90V, and the voltage necessary for the light emission of the auxiliary unit 16 is set to 10V. Assume a case. At this time, the source-drain voltage of the NMOS transistor 52 for turning on the switching circuit 30_2 may require 5V.

  Therefore, when the voltage environment is changed and the peak value of the rectified voltage is reduced to the 100 V level, the voltage necessary for the light emission of the auxiliary unit 16 can be secured, but the source − of the NMOS transistor 52 of the switching circuit 30_2 for forming the current path It is difficult to guarantee the drain voltage.

  Therefore, in the embodiment according to the present invention, the illuminating lamp 12 can stably emit light, but the auxiliary unit 16 may be turned off or have a low illuminance due to a decrease in current.

  However, as described above, the auxiliary unit 16 according to the embodiment of the present invention is configured such that the light emission is blinded so as not to affect the illumination, or the light emission is performed internally like a bulb type case. Configured.

  That is, the embodiment according to the present invention has a configuration in which a voltage equal to or higher than the light emission voltage Vf1 that emits light from the illuminating lamp 12 is defined as a surplus voltage, and a change in the light emission state due to the surplus voltage is eliminated.

  Therefore, in the embodiment according to the present invention, the unstable voltage region including the peak value of the rectified voltage, that is, the light emission corresponding to the surplus voltage is blinded, so that the stable illumination corresponding to the unstable voltage region is achieved. It can be guaranteed.

  In the embodiment according to the present invention, even if the rectified voltage enters an unstable voltage region, a current path can be formed by the action of the auxiliary part. The auxiliary part is an active element having a low resistance component like a light emitting diode. By being realized by an element or a passive element, excessive current consumption and heat generation can be avoided, and stable illumination can be ensured.

  The present invention can implement various current paths for the auxiliary unit 16 that operates corresponding to the surplus voltage, and can be implemented such that a current path is provided as shown in FIG.

  Further, unlike the case shown in FIG. 5, the auxiliary portion 16 may be formed of light emitting diodes connected in parallel as shown in FIG. 6 according to the intention of the manufacturer.

  On the other hand, the embodiment of FIG. 5 includes the light emitting diodes LED21 and LED22 in which the illuminating lamps 12 are connected in series, and the light emitting diode LEDB of the auxiliary unit 16 is connected to the current sensing resistor Rs. There are structural differences.

  In the embodiment of FIG. 5 as well, a rectified voltage equal to or higher than the level at which the illumination lamp 12 emits light is applied to the auxiliary unit 16, and the auxiliary unit 16 and the current correspond to the voltage higher than the level at which the light emitting diode LEDB of the auxiliary unit 16 is turned on. A current path including the sensing resistor Rs can be formed. In the embodiment of FIG. 5, the rectified voltage transmitted to the auxiliary unit 16, that is, a voltage component higher than the light emission voltage Vf1 can be defined as a surplus voltage.

  The operation of the embodiment of FIG. 5 will be described in more detail.

  The illuminating lamp 12 emits light in response to the rise of the rectified voltage, and the rectified voltage equal to or higher than the level emitted by the illuminating lamp 12 is transmitted to the auxiliary unit 16 as a surplus voltage.

  The illumination lamp 12 includes light emitting diodes LED21 and LED22 connected in series. Therefore, the light emitting diodes LED21 and LED22 emit light sequentially in response to an increase in the rectified voltage. Since the switching circuits 30_1 and 30_2 are initially turned on, the switching circuits 30_1 and 30_2 can provide a selective current path corresponding to the light emission of the light emitting diodes LED21 and LED22. That is, when the light emitting diode LED21 emits light, the current path can be provided by the turned on switching circuit 30_1, and when the light emitting diode LED22 emits light, the current path can be provided by the turned on switching circuit 30_2. In response to the rectified voltage at the time when the light emitting diode LED22 is turned on, the current sensing voltage formed in the current sensing resistor Rs becomes higher than the reference voltage VREF1. Therefore, the switching circuit 30_1 is turned off.

  Thereafter, when the rectified voltage rises, the auxiliary unit 16 connected in series with the illumination lamp 12 is used for light emission of the illumination lamp 12 and receives the remaining surplus voltage.

  When the surplus voltage rises above a level at which the light emitting diode LEDB of the auxiliary unit 16 can emit light, the light emitting diode LEDB emits light, and the current path is formed including the light emitting diode LEDB and the current sensing resistor Rs.

  At this time, the light emitting diodes LED21 and LED22 included in the illumination lamp 12 maintain a light emitting state, and are formed in the current sensing resistor Rs corresponding to the rectified voltage when the light emitting diode LEDB of the auxiliary unit 16 is turned on. The current sensing voltage becomes higher than the reference voltage VREF2. Therefore, the switching circuit 30_2 is turned off.

  Thereafter, when the rectified voltage decreases, the light-emitting diode LEDB of the auxiliary unit 16 is turned off and the light-emitting diodes LED21 and LED22 of the illumination lamp 12 are sequentially turned off, and the current path is also shifted accordingly.

  In the embodiment of FIG. 5, even if the voltage environment is changed and the peak value of the rectified voltage is changed, the light emission of the illumination lamp 12 is not affected.

  For this reason, the auxiliary unit 16 whose light emission state changes in accordance with the change of the voltage environment is, as in the embodiment described in FIGS. 1 to 4, light emission blinded so as not to affect the illumination? Or it is comprised so that light emission may be performed inside like a bulb type case.

  Therefore, the embodiment of FIG. 5 also has a configuration that eliminates the change in the light emission state due to the surplus voltage.

Therefore, in the embodiment of FIG. 5 as well, the light emission corresponding to the unstable voltage region including the peak value of the rectified voltage, that is, the surplus voltage is blinded as in the embodiment described in FIGS. This makes it possible to guarantee stable illumination corresponding to an unstable voltage region.
Also, in the embodiment of FIG. 5, the auxiliary portion is realized by an active element or passive element having a low resistance component such as a light emitting diode, so that excessive current consumption and heat generation can be avoided, and stable illumination is ensured. It becomes possible.

DESCRIPTION OF SYMBOLS 10: Rectifier circuit 12: Illuminating lamp 14: Current control part 16: Auxiliary part 30_1, 30_2: Switching circuit 32: Reference voltage supply part 50: Comparator 52: NMOS transistor 100: Cap 102: Base 104: Connection part 110: Illumination Substrate 112: Substrate 114: Wiring

Claims (11)

An illuminating lamp including one or more first light emitting diodes and emitting light by a rectified voltage;
An auxiliary unit connected in series with the illuminating lamp, used for light emission of the illuminating lamp, and receiving a surplus voltage remaining;
And a current control circuit for providing a current path for light emission of the illuminating lamp.   The light emitting diode illuminating apparatus of claim 1, wherein the auxiliary unit provides a path for transmitting the surplus voltage to ground.   The light emitting diode illumination according to claim 1, wherein the current control circuit includes a grounded current sensing resistor for forming the current path, and the auxiliary unit is connected to the current sensing resistor. apparatus.   The light emitting diode illuminating apparatus according to claim 1, wherein the auxiliary unit includes one light emitting diode or two or more second light emitting diodes connected in series, parallel, or series-parallel.   The light emitting diode illuminating apparatus of claim 4, wherein the second light emitting diode is blinded using a light blocking member.   The illumination lamp and the second light emitting diode are mounted on the same illumination board assembled in a bulb-type case, and the second light emitting diode is mounted on a surface opposite to the surface on which the illumination lamp is mounted. The light-emitting diode illuminating device according to claim 4, wherein   The illumination lamp is mounted on an illumination board assembled in a bulb-type case, and the second light emitting diode is configured in an inner space formed by the illumination board and the bulb-type case. Item 5. The light-emitting diode illuminating device according to Item 4.   The light-emitting diode illuminating apparatus according to claim 1, wherein the illuminating lamp includes a plurality of the first light-emitting diodes connected in series, parallel, or series-parallel. The current control circuit is
Two or more switching circuits that provide the current paths corresponding to sequential light emission of the plurality of first light emitting diodes, and a reference voltage supply unit that provides reference voltages of different levels to the two or more switching circuits A current control unit including:
A current sensing resistor connected in common to two or more of the switching circuits and forming the current path;
The two or more switching circuits compare the current sensing voltage formed in the current sensing resistor with the reference voltage, and perform switching to form the current path. The light-emitting diode illuminating device described.   The light emitting diode illuminating apparatus of claim 1, wherein the current control circuit provides the current path for the auxiliary unit. The current control circuit is
Two or more switching circuits that selectively provide the current path to the illuminating lamp and the auxiliary unit in response to a change in the level of the rectified voltage, and the two or more switching circuits having different reference voltages A current control unit including a reference voltage supply unit that provides
A current sensing resistor connected in common to two or more of the switching circuits and forming the current path;
The two or more switching circuits compare the current sensing voltage formed in the current sensing resistor with the reference voltage, and perform switching to form the current path. The light-emitting diode illuminating device described.

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