JP2009230971A - Electric equipment and lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lamp device capable of setting a proper service life by a downsized and inexpensive constitution. <P>SOLUTION: A temperature fuse 53 in which a lighting circuit 21 is opened by operation recommendation time period shorter than a rated service life of an LED by having an effect of a temperature due to heat generation of an electronic parts 67 that is lower than operation temperature is installed. By the temperature fuse 53, a part of the lighting circuit 21 to control a lighted state of the LED is constituted. Power feeding to the lighting circuit 21 can be cut off surely and the proper service life can be set by the downsized and inexpensive constitution. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric device and a lamp device including a load control circuit that controls the operation of a load having a predetermined lifetime.

Conventionally, as a lamp device as this type of electrical equipment, a bent fluorescent lamp arc tube and an electronic circuit are integrated, and a light bulb shape that is a light source (light emitter) as a load that can be directly used in a socket of a light bulb A fluorescent lamp is generally known (for example, refer to Patent Document 1). In addition, LED bulbs using LEDs as light sources are also beginning to spread (for example, see Patent Document 2).
Japanese translation of PCT publication No. 2002-542588 (page 7-10, FIG. 1) Japanese translation of PCT publication No. 2002-525814 (page 7-8, FIG. 1)

  In general, a fluorescent lamp has a lifetime of several thousand to 10,000 hours, and a longer lifetime can be expected by increasing the amount of emitter applied to operate as a hot cathode or increasing the enclosed gas pressure. Further, if the temperature of the LED is within an appropriate range, it is unlikely that the LED will fail in tens of thousands of hours, and the LED will have a long life.

  However, even in the case of a fluorescent lamp or LED, the luminous flux gradually decreases as the lighting time elapses. Therefore, a lamp that continues to be lit in a state where it is below the expected illuminance is not preferable. In the case of a lamp device integrated with an electronic circuit, if the life of the light source becomes longer than the life of the electronic circuit, the electronic components of the electronic circuit will eventually become a life and the lamp device becomes inconspicuous. In such a case, if an unspecified electronic component fails in an unpredictable state, the electronic component may become a heat source, which may cause undesirable deterioration of the lamp structure. For example, there is a possibility that the electrolytic solution vaporized due to deterioration of the electrolytic capacitor in the electronic circuit may be discharged, the circuit component may be thermally damaged, or the resin portion may be thermally dissolved due to overheating.

  On the other hand, a method of forcibly shutting off the power supply with an appropriate lifetime using a relatively expensive and complicated circuit such as a microcomputer control method is also conceivable. However, assuming a lamp to be mounted on an incandescent light bulb such as an LED light bulb, it is not a good idea because it is required to reduce the size of the circuit and at the same time to have an inexpensive configuration.

  As described above, there is a demand for a lamp that is small and inexpensive, has a proper life set by the lamp itself, and safely cuts off the power supply, and particularly in the case of an LED bulb, the demand is increasing.

  This invention is made | formed in view of such a point, and it aims at providing the electric equipment which can set an appropriate lifetime with a small and cheap structure.

  The electric device according to claim 1 includes an electronic component and a load control circuit that controls an operation of the load; and constitutes a part of the load control circuit, and the influence of the temperature due to heat generation of the electronic component that is lower than the heat resistant temperature. And a temperature sensitive element that opens the load control circuit with a predetermined recommended operation time shorter than a predetermined life time of the load.

  As the load, for example, a fluorescent lamp or a light source such as an LED is used. However, the load is not limited thereto, and may be a power device such as a motor, an acoustic device, an information device, or the like.

  The load control circuit includes, for example, a power supply circuit and a control circuit, and is configured by mounting a plurality of electronic components on a circuit board.

  As the temperature-sensitive element, an electronic component constituting the load control circuit, for example, a thermal fuse, a capacitor, or an FET is used, but is not limited thereto.

  The temperature sensing element that forms part of the load control circuit is affected by the temperature of the electronic component that is lower than the heat-resistant temperature, thereby controlling the load with a predetermined recommended operation time shorter than the predetermined life time of the load. By opening the circuit, power supply is reliably cut off with a small and inexpensive configuration, and an appropriate life is set.

  The electrical device according to claim 2 is an electrical device according to claim 1, wherein the temperature sensitive element is a biasing means for biasing a pair of conducting portions and one conducting portion away from other conducting portions. In addition, the operating range of the urging means is regulated to maintain the state where the one conducting portion and the other conducting portion are conducted, and gradually, due to the influence of the heat generated by the electronic component lower than the predetermined rated temperature. A fusible body that relaxes the restriction of the operating range of the urging means with a predetermined recommended operation time shorter than the predetermined life time of the load and separates one conductive part from the other conductive part It is a thermal fuse provided.

  For example, a relatively fixed lead wire and a movable electrode movable with respect to the lead wire are used for the conductive portion.

  As the biasing means, for example, an elastic body having an elastic restoring force such as a coil spring is used.

  The soluble body is, for example, a pellet formed of a thermoplastic resin or the like.

  The pellets gradually sublimate due to the influence of the heat generated by the electronic component lower than the predetermined rated temperature and relax the restriction of the operating range of the urging means within a predetermined recommended operation time, so that the conducting part is energized by the urging means. By using a temperature fuse separated as a temperature-sensitive element so as to open the electrical connection between them, power supply is reliably cut off with a small and inexpensive configuration.

  The lamp device according to claim 3 comprises: a light source; and the electric apparatus according to claim 1 or 2 that controls the operation of the light source using the light source as a load, wherein the rated life time of the light source is a predetermined life of the load. The operation of the load control circuit of the electric device is stopped as time passes.

  The operation of the electric device according to claim 1 or 2 that controls the operation of the light source using the light source as a load is stopped by setting the rated life time of the light source as a predetermined life time of the load, thereby setting an appropriate life. .

  According to the electrical device of the first aspect, the temperature-sensitive element that constitutes a part of the load control circuit is affected by the temperature of the electronic component that is lower than the heat-resistant temperature, so that the predetermined lifetime of the load is exceeded. By opening the load control circuit with a short predetermined recommended operation time, it is possible to reliably cut off the power supply with a small and inexpensive configuration and set an appropriate life.

  According to the electric device according to claim 2, in addition to the effect of the electric device according to claim 1, the pellet is gradually sublimated due to the influence of the heat generated by the electronic component lower than the predetermined rated temperature, and the predetermined operation is performed. Small and inexpensive configuration by using as the temperature sensitive element a thermal fuse that is spaced apart so as to open the electrical connection between the conducting parts by the biasing means by relaxing the restriction of the operating range of the biasing means in the recommended time Can reliably cut off the power supply.

  According to the lamp device of claim 3, the operation of the electric device according to claim 1 or 2 that controls the operation of the light source with the light source as a load is stopped with the rated life time of the light source as a predetermined life time of the load. By this, an appropriate life can be set.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  Fig. 1 is a cross-sectional view of a part of the electric device, Fig. 2 is a cross-sectional view of a part of the electric device, Fig. 3 shows the operation of the temperature sensing element, and (a) shows the sensation under normal temperature conditions. Explanatory cross-sectional view showing the state of the temperature element, (b) is an explanatory cross-sectional view showing the state of the temperature-sensitive element under a temperature higher than the heat-resistant temperature, and (c) is the load under the temperature state higher than the recommended operating temperature. FIG. 4 is a graph showing the relationship between the dimension of the fusible body of the temperature sensing element and the cumulative operation time after the recommended operation time has elapsed.

  As shown in FIGS. 1 and 2, an LED bulb-like LED lamp device 11 that is a lamp device as an electric device has a disk-like substrate 14 disposed on a base 12 via a cover 13 as an outer member. Has been.

  The base 12 is, for example, a so-called E26 type base used for a general incandescent bulb or the like.

  The cover 13 is formed in a cylindrical shape whose diameter is expanded from the base 12 side to the substrate 14 side by a member such as a synthetic resin, for example, and a lighting circuit 21 as a load control circuit is disposed therein. The lighting circuit 21 is electrically connected to the base 12 and the substrate 14.

  The substrate 14 is formed in a disk shape with a metal such as aluminum or copper, for example, and is disposed so as to close the upper end portion of the cover 13. A plurality of LEDs 23 serving as a light source as a load are disposed at predetermined positions on the upper surface. This is an LED module in which a protruding portion 25 is provided. Further, the surface of each protrusion 25 is covered with a silver plating layer 27. Further, an insulating layer 32 is provided between the projecting portions 25 and 25 via an adhesive layer 31, and a conductor 33 is provided on each insulating layer 32. A light reflecting layer 34 is provided above the conductor 33. Is provided.

  The LED 23 has an element substrate 37 bonded to a silver plating layer 27 with a light-transmitting die bond material 36, for example, and a semiconductor light emitting layer 38 is laminated on the element substrate 37, and electrodes are formed on the semiconductor light emitting layer 38. Reference numerals 41 and 42 denote semiconductor chips disposed apart from each other. Further, these electrodes 41 and 42 are electrically connected to the conductors 33 and 33 by bonding wires 44 and 45. Accordingly, the LEDs 23 are connected to each other in series by the conductor 33. The LED 23 is sealed with a sealing member (not shown). In addition, these LEDs 23 have a predetermined rated life time until the LED 23 becomes inoperable (unsatisfactory), and have a predetermined recommended operation time shorter than the rated life time. Here, the recommended operation time refers to a time in which the luminous flux maintenance factor of the LED 23 is not less than a predetermined value, for example, not less than 70%. In other words, the recommended operation time is a time when the luminous flux maintenance factor of the LED 23 becomes less than 70% after the time. For example, the LED 23 has a rated life time of 50,000 hours or more and a recommended operation time of about 20,000 hours.

  The die bond material 36 is an adhesive made of, for example, a translucent silicone resin.

  The element substrate 37 is a sapphire substrate, for example, and the semiconductor light emitting layer 38 is an element that emits monochromatic light such as blue.

  The sealing member is made of, for example, a resin in which a phosphor (not shown) is mixed. This phosphor emits light of a color different from that of the LED 23 when excited by a part of the light emitted from the LED 23, for example. In this embodiment, yellow light is emitted with respect to the blue light of the LED 23. By doing so, it is configured to obtain white illumination light.

  Further, the protruding portion 25 is provided such that the height including the silver plating layer 27, for example, makes the height position of the upper surface of the LED 23 equal to or higher than the height position of the conductor 33.

  The silver plating layer 27 is provided at a time together with, for example, the light reflection layer 34 by electroless plating.

  The adhesive layer 31 is configured by impregnating a thermosetting adhesive resin into a sheet made of a fiber material such as paper or cloth.

  For the insulating layer 32, for example, a white glass epoxy substrate is used in order to obtain light reflection performance.

  Although not shown, the lighting circuit 21 includes a power supply circuit that performs AC-DC conversion of power from a commercial AC power supply, a lighting control circuit that operates by power feeding from the power supply circuit, and controls the lighting state of the LED 23, and the like. On the circuit board 51, various electronic components such as a rectifying element, a smoothing capacitor, a current limiting element, a resistor, and an FET are mounted.

  The electronic components constituting the lighting circuit 21 include a thermal fuse 53 as a temperature sensitive element that can open the lighting circuit 21. This thermal fuse 53 is preferably provided in, for example, an input line of a power supply circuit, etc., and does not operate in a normal temperature state, and electrical continuity can be obtained. When the temperature, that is, the operating temperature is exceeded, the open mode is set, and the power supply circuit of the lighting circuit 21 is opened so that the power supply to the LED 23 is cut off. Hereinafter, the normal temperature state refers to a temperature range in which the thermal fuse 53 is most desirable, that is, a state below the recommended temperature. The thermal fuse 53 has, for example, an operating temperature of 91 ° C., tolerances of + 3 ° C., and −1 ° C.

  The temperature fuse 53 has a lead wire 55 as a conducting portion inserted into one end side of a cylindrical case body 54 having conductivity such as metal, and is connected to the other end side of the case body 54. The lead wire 56 is attached, and the cylindrical insulator 57 is attached around the end portion of the one lead wire 55 in the case body 54, and the conducting portion facing the one lead wire 55 is provided in the case body 54. The movable electrode 58 is slidably accommodated in the axial direction, and the movable electrode 58 is urged toward the other end in the case body 54 by the coil spring 59 as the first urging means as the urging means. In addition, a pellet 60 as a fusible body is accommodated in the case body 54 on the opposite side of the movable electrode 58 from the coil spring 59. Further, the thermal fuse 53 is switched between a conduction mode and an open mode by the pellet 60 and the coil spring 59.

  A stepped portion 57a is formed on the outer peripheral surface of the insulator 57, and one end side of a coil spring 59 is attached to the stepped portion 57a. Accordingly, one end side of the coil spring 59 is held between the insulator 57 and the case body 54.

  The other end side of the coil spring 59 is in contact with one end surface of the movable electrode 58. A disc 63 is attached to the other end surface of the movable electrode 58, and one end of a coil spring 64 as second urging means is attached to the disc 63. The other end of the coil spring 64 is attached to a disk 65 attached to the pellet 60, and biases the movable electrode 58 and the pellet 60 in a direction away from each other. Further, the outer peripheral surface of the movable electrode 58 is in contact with the inner peripheral surface of the case body 54, and is electrically connected to the other lead wire 56 through the case body 54.

  The coil spring 59 is in a substantially contracted state at a normal temperature state, and one end surface of the movable electrode 58 contacts the tip of one lead wire 55 against the bias of the coil spring 59. As a result, the lead wire 55 and the movable electrode 58 (lead wire 56) are electrically connected.

  The coil spring 64 is sandwiched from both ends by the discs 63 and 65 and is positioned between the movable electrode 58 and the pellet 60. Further, the coil spring 64 is in a state of being contracted to a maximum at a normal temperature state.

  The pellet 60 is formed of, for example, a thermoplastic resin that melts at a predetermined operating temperature, is disposed between the disk 65 and the other end of the case body 54, and is in contact with the other lead wire 56. . In addition, the pellet 60 maintains the conduction between the lead wire 55 and the movable electrode 58 in a state in which the coil springs 59 and 64 are contracted by forming a solid at a normal temperature state shown in FIG. As shown in 3 (b), the restriction of the expansion of the coil springs 59 and 64 in the case body 54 is relaxed by melting at the heat-resistant temperature, that is, the operating temperature to form the liquid pellet 60a. Further, the pellet 60 sublimates (melts) at a predetermined temperature lower than the operating temperature and close to the operating temperature (higher than the recommended use temperature of the thermal fuse 53), and gradually increases the volume as shown in FIG. (Dimension) decreases.

  Therefore, even if the pellet 60 does not reach the original operating temperature, the thermal fuse 53 is a coil spring whose volume (dimension) is decreased when a predetermined time elapses at a predetermined temperature, as shown in FIG. By extending 59, the contact between the movable electrode 58 and the lead wire 55 is separated and the open mode is set. As described above, when the sublimation amount of the pellet 60 in which the thermal fuse 53 is in the open mode is S and the temperature of the thermal fuse 53 is TF, the function f (TF) which is the sublimation speed of the pellet 60 per unit time is used for sublimation. The quantity S is a time integral value of f (TF) dt. That is, the thermal fuse 53 is incorporated in the lighting circuit 21, and the thermal fuse 53 is disposed at a position where the predetermined operating temperature is obtained so that the sublimation amount S corresponding to the recommended operation time of the LED 23 can be obtained. Thus, the recommended operation time of the LED 23 is controlled.

  Specifically, the temperature fuse 53 has a predetermined temperature change during the operation of the LED lamp device 11, for example, so that the recommended operation time of the LED 23 is set to a predetermined time, in this embodiment, 20,000 hours. The position, for example, of the predetermined electronic components 66 constituting the lighting circuit 21, is attached in close contact with the electronic component 67 having the highest temperature through a non-conductive or insulating member such as a silicone resin. The heat generation of the electronic component 67 is directly transmitted to the thermal fuse 53. The electronic component 67 is set such that the surface temperature when the LED 23 is continuously lit is, for example, about 81 ° C.

  Next, the operation of the above embodiment will be described.

  The base 12 is screwed into a light bulb socket (not shown) and supplied with power from a commercial AC power supply, whereby the lighting circuit 21 performs AC-DC conversion and the voltage is adjusted, and the substrate 14 is connected via the conductor 33 and bonding wires 44 and 45. A predetermined voltage is applied to each of the LEDs 23, and these LEDs 23 light up.

  A part of the light emitted from the LED 23 passes through the sealing member without exciting the phosphor of the sealing member by exciting the phosphor mixed in the sealing member and emitting yellow light. The white light is mixed with the blue light from.

  As shown in FIG. 3A, the thermal fuse 53 is configured such that the extension of the coil springs 59 and 64 is restricted by the length of the pellet 60 and the movable electrode 58 contacts the lead wire 55 as shown in FIG. Thus, electrical continuity with the lead wire 55, the movable electrode 58, the case body 54, and the lead wire 56 is obtained. On the other hand, for example, when each electronic component 66, 67 of the lighting circuit 21 is overheated due to a failure or the like, if the temperature of the electronic component 66, 67 exceeds the operating temperature, as shown in FIG. 60 melts to form a liquid pellet 60a, and the coil springs 59 and 64 extend, so that the movable electrode 58 is separated from the lead wire 55 and the temperature fuse 53 is in an open mode between the lead wires 55 and 56. Electrical continuity is interrupted.

  Here, when the electronic components 66 and 67 generate heat due to the operation of the lighting circuit 21, the temperature (about 81 ° C.) due to the heat generation of the electronic component 67 directly attached with the temperature fuse 53 is higher than the operating temperature of the temperature fuse 53. Is lower than the recommended temperature (for example, 71 ° C.), the thermal fuse 53 is directly affected by the temperature due to the heat generated by the electronic component 67, and the pellet 60 gradually sublimates as shown in FIG. Become.

  When the recommended operation time of the LED 23 is reached, the size of the pellet 60 is reduced to the extent that the movable electrode 58 is separated from the lead wire 55 by the bias of the coil spring 59, as shown in FIG. As a result, the thermal fuse 53 enters the open mode, the electrical continuity between the lead wires 55 and 56 is cut off, the lighting circuit 21 is opened, and the LED 23 becomes unsatisfactory.

  In this way, the recommended operating time (approximately 20,000 hours) shorter than the rated life time (more than 50,000 hours) of the LED 23 due to the temperature fuse 53 being affected by the temperature of the electronic component 67 that is lower than the operating temperature. By opening the lighting circuit 21 with the open mode, the power supply to the lighting circuit 21 can be reliably cut off and a proper life span can be set with a small and inexpensive configuration without using expensive components such as a microcomputer. .

  In other words, when the cumulative operation time of the lighting circuit 21 becomes longer than the recommended operation time of the LED 23, the LED 23 itself can continue to be lit until the rated life time although the luminous flux maintenance factor is reduced, whereas the lighting circuit 21 (electronic component) Will reach the service life first. In this case, if an unspecified electronic component breaks down in an unpredictable state, the electronic component can become a heat source, which can adversely deteriorate the structure of the LED lamp device 11. For this reason, when the recommended operation time of the LED 23 is reached, the temperature fuse 53 is in the open mode and the lighting circuit 21 is opened, so that the failure of such an unspecified electronic component in an unexpected state can be prevented. And the service life of the LED lamp device 11 can be reliably set to the recommended operation time.

  Further, the pellet 60 gradually sublimates due to the influence of the temperature generated by the heat generation of the electronic component 67 lower than the operating temperature, and the restriction of the operating range of the coil spring 59 is relaxed by the recommended operating time of the LED 23. By using the temperature fuse 53 spaced apart so as to open the electrical connection between the lead wire 55 and the lead wire 55 as a temperature sensitive element, the power supply to the lighting circuit 21 can be reliably cut off with a small and inexpensive configuration.

  Furthermore, by using the load as a light source and stopping the operation of the LED lamp device 11 that controls the operation of this light source with the rated life time of the light source as the predetermined life time of the load, the appropriateness according to the luminous flux maintenance factor of the LED 23, etc. An LED lamp device 11 having a long life can be obtained. In particular, the LED 23 generally has a longer life and has a longer service life than the lighting circuit 21. Therefore, it is possible to expect the electronic components of the lighting circuit 21 by reliably shutting off the lighting circuit 21 within the recommended operation time. It is possible to reliably prevent such failures.

  The temperature fuse 53 has a function f (TF) that increases as the use temperature TF increases, and the recommended operation time of the LED lamp device 11 is set to be short. In addition, since the other electronic components of the lighting circuit 21 are greatly deteriorated, it is a reasonable choice to set the recommended operation time of the LED lamp device 11 used in a high temperature environment to be shorter by the temperature fuse 53. That is, by using the temperature fuse 53 for setting the service life of the LED lamp device 11 in this way, the lighting circuit 21 of the LED lamp device 11 can be opened with an appropriate life time corresponding to the heat generation temperature of the lighting circuit 21 and the like. .

  In the above-described embodiment, the thermal fuse 53 is located at a position where the pellet size changes so as to cut off the conduction between the lead wire 55 and the movable electrode 58 by the coil spring 59 during the desired recommended operation time of the LED 23. It is possible to arrange at any position.

  In addition, the structure of the thermal fuse 53 can obtain electrical continuity in a normal temperature state, the fusible body dissolves at a predetermined operating temperature to cut off the electrical continuity, and time elapses under the predetermined temperature. In addition, the structure is not limited to the above as long as the soluble body is gradually dissolved and the electrical conduction is interrupted after a predetermined time.

  Further, as the temperature sensitive element, in addition to the temperature fuse 53, for example, a capacitor constituting the lighting circuit 21 or an FET can be similarly operated. In this case, the temperature sensitive elements are arranged at a temperature lower than the heat-resistant temperature of each element and higher than the recommended temperature, and are set so as to be damaged in a desired recommended operation time of the LED 23. In this case, since the electronic component itself constituting the lighting circuit 21 is a temperature-sensitive element, it is not necessary to separately provide the temperature-sensitive element in the lighting circuit 21, and the lighting circuit 21 can be simplified.

  Further, although the LED lamp device 11 has been described, the light source can be handled as a fluorescent lamp.

  And it can respond similarly to the load control circuit which controls loads other than a light source.

It is sectional drawing which notched some electric devices which show one embodiment of this invention. It is sectional drawing of a part of electrical equipment same as the above. The operation of the temperature sensing element of the electrical equipment is shown, (a) is an explanatory sectional view showing the state of the temperature sensing element under a normal temperature state, (b) is a temperature sensing element under a temperature higher than the heat-resistant temperature FIG. 4C is an explanatory cross-sectional view showing the state of the temperature sensing element after the recommended operation time of the load has elapsed under a temperature state higher than the recommended operation temperature. It is a graph which shows the relationship between the dimension of the soluble body of the temperature sensing element of an electrical equipment same as the above, and cumulative operation time.

Explanation of symbols

11 LED lamp device which is a lamp device as electrical equipment
21 Lighting circuit as a load control circuit
23 LED as a light source as a load
53 Thermal fuse as a temperature sensing element
55 Lead wire as conducting part
58 Movable electrodes as conducting parts
59 Coil spring as biasing means
60 Pellets as soluble bodies
66 Electronic components
67 Electronic components

Claims (3)

A load control circuit comprising electronic components and controlling the operation of the load;
A part of this load control circuit is configured, and the load control circuit is opened at a predetermined recommended operation time shorter than the predetermined life time of the load by being affected by the temperature of heat generated by electronic components lower than the heat-resistant temperature. A temperature sensing element;
An electrical apparatus comprising: The temperature sensing element includes a pair of conducting parts, an urging means for urging one conducting part in a direction away from the other conducting part, and one conducting part by regulating an operating range of the urging means. And the other conductive part are maintained in a conductive state, and gradually sublimated due to the influence of the heat generated by the electronic component lower than the predetermined rated temperature, thereby reducing the predetermined life time of the load. The electrical fuse according to claim 1, wherein the temperature fuse includes a fusible body that relaxes the restriction of the operation range of the urging means during the recommended operation time and separates one conducting portion from the other conducting portion. machine. With a light source;
The electric device according to claim 1 or 2, wherein the operation of the light source is controlled by using the light source as a load.
An operation of a load control circuit of an electric device is stopped with a rated life time of the light source as a predetermined life time of the load.

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