JP3815640B2 - Light bulb-type fluorescent lamp and lighting fixture - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light bulb shaped fluorescent lamp and a lighting fixture.
[0002]
[Prior art]
A bulb-type fluorescent lamp using a high-frequency lighting circuit has a problem in that if the fluorescent lamp continues to be lit in the state where the end of its life is reached, the bulb temperature in the vicinity of the electrode excessively rises and damages peripheral components. For this reason, in general, a fuse is inserted in the power supply input section, and when the input current increases at the end of the life of the fluorescent lamp, the fuse is cut off to prevent the parts from being damaged. For example, a high-frequency lighting device for a light bulb shaped fluorescent lamp disclosed in Japanese Patent Application Laid-Open No. 2-162700 has a smoothing capacitor 22 and a MOS for smoothing after rectifying a commercial AC power supply Vs by a rectifier 21, as shown in FIG. A thermal fuse 23 is interposed between the field effect transistors 24. As shown in FIG. 7, the thermal fuse 23 is sandwiched between a heat radiation plate 24a of the MOS field effect transistor 24 and a heat radiation plate 25a of the MOS field effect transistor 25, and both the MOS field effect transistors 24, The circuit board 26 is thermally coupled to the circuit board 26. When the fluorescent lamp 27 reaches the end of its life or when an abnormality occurs in the operation of the high-frequency lighting device 20 and the lamp current increases, the circuit components of the high-frequency lighting device 20 abnormally generate heat. In particular, since a large lamp current flows through the MOS field effect transistors 24 and 25, the heat generation becomes extremely large. Thus, large heat is released to the heat sinks 24a and 25a, and as a result, the thermal fuse 23 is blown out in a short time. When the thermal fuse 23 is blown, the operation of the inverter circuit 28 is stopped and the fluorescent lamp 27 is not energized.
[0003]
[Problems to be solved by the invention]
In the above-described conventional fluorescent lamp, the heat from the MOS field effect transistors 24 and 25 is directly received by the thermal fuse 23. Therefore, at the end of the life of the fluorescent lamp 27, the operation of the inverter circuit 28 is stopped in a short time. It is something that can be done. However, since the above-described prior art bulb-type fluorescent lamp includes the thermal fuse 23, the number of components increases, and the thermal fuse 23 is disposed on the circuit board 26 so as to be sandwiched between the heat sinks 24a and 25a. Takes time, and as a result, there is a disadvantage that the product cost increases.
[0004]
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a bulb-type fluorescent lamp and a lighting fixture that can stop the oscillation operation of the inverter circuit with a simple configuration mainly at the end of the life of the fluorescent lamp. And
[0005]
[Means for Solving the Problems]
The light-bulb fluorescent lamp according to claim 1 includes a base having a base that can be electrically connected to a commercial AC power source; a fluorescent lamp attached to the base; and a circuit board supported by the base. The circuit board is mounted with an inverter that converts the commercial AC power supplied through the base into a direct current and outputs high-frequency power to the fluorescent lamp by oscillation of the switch element. The switch element faces the fluorescent lamp. A high-frequency lighting device that is arranged on one side of a circuit board that is disposed and has a heat-generating component arranged on the other side of the part where the switch element is arranged. To do.
[0006]
In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
[0007]
The fluorescent lamp is a lamp having a bent shape such as a U-shape or a bowl shape, and the tube diameter, length, power, type, etc. are not limited.
[0008]
Any number of switch elements may be used as long as they form an inverter such as a field effect transistor or a bipolar transistor by performing an on / off operation.
[0009]
The portion where the switch element is disposed is a place where the switch element disposed on one side of the circuit board occupies the circuit board, that is, the switch element is projected onto the circuit board from a direction perpendicular to the circuit board. The projected area is sometimes allowed, but if the heat generating component gives a thermal action to the switch element, its vicinity is allowed.
[0010]
The heat generating component is a component that increases the amount of heat generated as the lamp power increases, and constitutes a part of the circuit component of the high-frequency lighting device. Therefore, when there are a plurality of switching elements such as an inverter having a half bridge type, one of them is allowed to be a heat generating component.
[0011]
The switch element only needs to be disposed on the circuit board so as to be thermally affected by the heat-generating component when the heat-generating component abnormally generates heat, and does not need to be disposed in close proximity or close to the circuit board.
[0012]
Since the switch element is disposed to face the fluorescent lamp, the switch element is easily damaged by heat due to the thermal action from the fluorescent lamp.
[0013]
The bulb-type fluorescent lamp is supplied with power from a commercial AC power source through a base. The switching element of the inverter oscillates and outputs high frequency power to the fluorescent lamp, and the fluorescent lamp is lit. When the fluorescent lamp reaches the end of its life or the inverter operates abnormally, the input current increases, the heat generated by the heat generating component increases, and the heat generated by the switch element also increases. In addition to its own heat generation, the switch element is thermally destroyed within a short time due to the heat action from the heat generating components and the fluorescent lamp . As a result, the inverter stops oscillating and the fluorescent lamp is turned off.
[0014]
The high-frequency lighting device is configured such that the heat generating component is disposed on the other surface side of the part of the switch element disposed on the one surface side of the circuit board, and the switch element is opposed to the fluorescent lamp. Susceptible to heat from heat-generating components and fluorescent lamps . As a result, when the fluorescent lamp reaches the end of its life or when the inverter operates abnormally, it is possible to immediately destroy the switch element and stop the inverter.
[0015]
According to a second aspect of the present invention, there is provided a light-bulb fluorescent lamp having a base having a base that can be electrically connected to a commercial AC power source; a fluorescent lamp attached to the base; and a circuit board supported by the base. The circuit board is mounted with an inverter that converts the commercial AC power supplied through the base into a direct current and outputs high-frequency power to the fluorescent lamp by oscillation of the switch element. The switch element is mounted on one side of the circuit board. A heating component comprising an inductor element or a resistance element connected in series between a rectifier circuit for converting a commercial AC power source into a direct current and a switch element on the other side of the portion where the switch element is disposed And a high-frequency lighting device arranged and configured .
[0016]
The inductor element or the resistance element is an element for preventing an inrush current, and generates a large amount of heat as the input current increases at the end of the life.
[0017]
Since it is a heat-generating component that generates a large amount of heat as the input current increases due to the end of the life of the fluorescent lamp or an abnormal operation of the inverter, the switch element can be thermally damaged by heat acting on the switch element.
[0018]
According to a third aspect of the present invention, there is provided a light-bulb fluorescent lamp having a base having a base that can be electrically connected to a commercial AC power source; a fluorescent lamp attached to the base; and a thickness of 0 supported by the base. A circuit board having a thickness of 5 to 1.0 mm is mounted on the circuit board, and an inverter that converts the commercial AC power supplied through the base into a direct current and outputs high-frequency power to the fluorescent lamp by oscillation of a switch element is mounted. A high-frequency lighting device configured such that the switch element is disposed on one surface side of the circuit board and a heat generating component is disposed on the other surface side of the portion where the switch element is disposed. It is characterized by that .
[0019]
If the thickness of the circuit board is less than 0.5 mm, the mechanical strength of the circuit board is small and impractical, and if it is a circuit board on which components are mounted on both sides, the withstand voltage characteristic between the two faces is reduced. Also, if the thickness of the circuit board exceeds 1.0 mm, heat from the heat-generating component is not transferred well to the switch element via the circuit board, and the height dimension of the high-frequency lighting device increases, and the high-frequency lighting device has a high frequency in the base. In order to accommodate the lighting device, it is necessary to enlarge the base, and as a result, the bulb-type fluorescent lamp becomes large. Therefore, the thickness of the circuit board is set to 0.5 to 1.0 mm.
[0020]
Since the thickness of the circuit board is 0.5 to 1.0 mm, the heat-generating component can effectively act on the switch element and the height of the high-frequency lighting device can be reduced. Can be.
[0021]
The invention of a lighting fixture according to claim 4 comprises the bulb-type fluorescent lamp according to any one of claims 1 to 3 ; and a lighting fixture body that accommodates the bulb-type fluorescent lamp.
[0022]
The lighting fixture which has the effect | action of Claim 1 thru | or 3 and an effect can be provided.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0024]
FIG. 1 is a partially cutaway sectional view of a light bulb shaped fluorescent lamp showing a first embodiment of the present invention, and FIG. 2 is a circuit diagram of a lighting device for the light bulb shaped fluorescent lamp.
[0025]
A bulb-type fluorescent lamp 1 shown in FIG. 1 includes a fluorescent lamp 2, a base 3, a lighting device 4, and the like. The fluorescent lamp 2 is formed with a light emitting portion 2c bent in a U-shape, filled with an inert gas such as argon gas, and electrodes (not shown) are sealed at both ends 2a and 2b. The base 3 is formed of a heat-resistant synthetic resin such as PBT resin, a screw-type base 5 that can be electrically connected to a commercial AC power source is attached to one end 3a, and a fluorescent lamp 2 is made of resin or the like at the other end 3b. Used to secure. The base 3 has a circuit board 6 supported by the base 3, and a high-frequency lighting device 4 serving as a lighting device in which an inverter 7 having a switching element Q 1 is mounted on the circuit board 6 is accommodated. Has been. The circuit board 6 is formed of a glass epoxy material having a thickness of 0.5 to 1.0 mm, and one switch element Q1 constituting the inverter 7 is arranged on one side (lower side) and the switch element Q1 is arranged. A resistance element R1 as a heat generating component is disposed on the other surface side (upper surface side) of the provided portion. As a result of disposing the switch element Q1 on the lower surface side of the circuit board 6, the switch element Q1 faces the fluorescent lamp 2 and is easily subjected to the thermal action from the fluorescent lamp 2. The high-frequency lighting device 4 is electrically connected to the base 5 and the fluorescent lamp 2 through lead wires (not shown). The inverter 7 is supplied with power obtained by converting the commercial AC power supplied through the base 5 into direct current. The high frequency power is output to the fluorescent lamp 2 by the oscillation of the switch element Q1 to turn on the fluorescent lamp 2, and the operation is stopped when the switch element Q1 is destroyed. The base 5 may be a plug-in type.
[0026]
Next, the high frequency lighting device 4 shown in FIG. 2 will be described.
[0027]
In the high-frequency lighting device 4, a capacitor C1 is connected to a commercial AC power source Vs via a fuse F1, and an input terminal of a full-wave rectifier Rec1 is further connected via an inductor L1. The capacitor C1 and the inductor L1 constitute a noise filter. A smoothing capacitor C2 is connected to the output terminal of the full-wave rectifier Rec1 via a resistor R1 to constitute a DC power supply. The resistor R1 is an element for preventing inrush current, and the resistor R1 may be an inductor. The smoothing capacitor C2 is connected to an instant start type half-bridge type inverter circuit 7.
[0028]
Inverter circuit 7 has a smoothing capacitor C2 connected across a series circuit of a MOS-type N-channel field effect transistor Q1 and a MOS-type P-channel field effect transistor Q2 which are switching elements. One end of the filaments 2d and 2e of the fluorescent lamp 2 is connected between the drain and source of the field effect transistor Q2 via the ballast choke L2 and the DC cut capacitor C3, and one end of the filament 2d and the other end of the filament 2e. A preheating capacitor C4 is connected between them.
[0029]
A starting resistor R2 constituting the starting circuit 8 is connected between the connection point a of the resistor R1 and the smoothing capacitor C2, the gate of the field effect transistor Q1 and the gate of the field effect transistor Q2, and these field effects are connected. A series circuit of a capacitor C5 and a capacitor C6 is connected between the gate of the transistor Q1 and the gate of the field effect transistor Q2 and the connection point b of the field effect transistor Q1 and the field effect transistor Q2. A series circuit of a Zener diode ZD1 and a Zener diode ZD2 for protecting the gates of the field effect transistor Q1 and the field effect transistor Q2 is connected in parallel to the series circuit of the capacitor C6 of the control circuit 9. A secondary winding L3 is magnetically connected to the ballast choke L2, and a resonance circuit 10 of an inductor L4 and a capacitor C6 is connected to the secondary winding L3. Further, the resistor R3 of the starting circuit 8 is connected in parallel to the series circuit of the capacitor C5 and the inductor L4. Further, a parallel circuit of the resistor R4 of the starting circuit 8 and the switching improvement capacitor C7 is connected between the drain and source of the field effect transistor Q2.
[0030]
The components other than the commercial AC power supply Vs and the fluorescent lamp 2 of the high-frequency lighting device 4 are mounted on the circuit board 6. The N-channel field effect transistor Q1 is mounted on one surface side of the circuit board 6, the inrush current preventing resistor R1 is mounted on the other surface side of the portion where the N-channel field effect transistor Q1 is mounted, and the other surface side Parts are mounted.
[0031]
In addition, although the fluorescent lamp 2 uses the filament 2d as one-side preheating, it may be a double-sided preheating type lamp. The switch element mounted on one surface side of the circuit board 6 may be a P-channel field effect transistor Q2.
[0032]
Next, the operation of the first embodiment will be described.
[0033]
When the high-frequency lighting device 4 is turned on, the AC voltage of the commercial AC power supply Vs is full-wave rectified by the full-wave rectifier Rec1 and smoothed by the smoothing capacitor C2. A voltage is applied to the gate of the N-channel field effect transistor Q1 through the resistor R2, the field effect transistor Q1 is turned on, and a voltage is applied to the fluorescent lamp 2 through the ballast choke L2. Then, a voltage is induced in the secondary winding L3 of the ballast choke L2, the inductor L4 and the capacitor C6 of the control circuit 9 inherently resonate, and a voltage is alternately applied to the gates of the field effect transistor Q1 and the field effect transistor Q2, The field effect transistor Q1 and the field effect transistor Q2 are alternately turned on and off to light the fluorescent lamp 2. When the fluorescent lamp 2 is normally lit, the field effect transistors Q1, Q2 and the resistor R2 generate heat, but this heat generation is not so much that the field effect transistors Q1, Q2 are thermally destroyed.
[0034]
When the half-wave discharge occurs at the end of the life of the fluorescent lamp 2, the lamp voltage increases and the N-channel field effect transistor Q1 and the P-channel field effect of the inverter circuit 7 in which the asymmetrical direct current due to the half-wave discharge is formed of two stones and forms a half bridge. The current flows through the transistor Q2. Then, the drain current flowing in the N-channel field effect transistor Q1 and the P-channel field effect transistor Q2 and the on-off timing of the N-channel field effect transistor Q1 and the P-channel field effect transistor Q2 are shifted, and the N-channel field effect transistor Q1 and the P-channel field field The effect transistor Q2 is stressed and generates heat. As the life of the fluorescent lamp 2 progresses, the asymmetric current increases, and the heat generation of the N-channel field effect transistor Q1 and the P-channel field effect transistor Q2 increases. On the other hand, the input current flowing through the resistor R1 also increases as the life of the fluorescent lamp 2 progresses, and the heat generated by the resistor R1 increases. The N-channel field effect transistor Q1 is finally destroyed by heat due to its own heat generation , heat generation by the resistor R1, and heat generation by the fluorescent lamp 2 . As a result, the inverter circuit 7 stops oscillating and the fluorescent lamp 2 is turned off.
[0035]
Since the resistor R1 is disposed on the other surface side (upper surface side) of the portion of the N-channel field effect transistor Q1 disposed on one surface side (lower surface side) of the circuit board 6, the N-channel field effect transistor Q1 has resistance. It is susceptible to thermal action from R1. By addition, one surface of the circuit board 6 N-channel field effect transistor Q1 is disposed (bottom surface side), so faces the fluorescent lamp 2, N-channel field effect transistor Q1, the heat generation of the fluorescent lamp 2 Also receives heat effects . Therefore, when the fluorescent lamp 2 reaches the end of its life and half-wave discharge occurs, the N-channel field effect transistor Q1 is immediately thermally destroyed and the fluorescent lamp 2 is extinguished, so that the bulb-type fluorescent lamp 1 can be replaced immediately. Further, since the temperature fuse 23 shown in FIG. 7 is not specially assembled, the bulb-type fluorescent lamp 1 can be made inexpensive.
[0036]
FIG. 3 is a partially cutaway cross-sectional view of a light bulb shaped fluorescent lamp showing a second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.
[0037]
A bulb-type fluorescent lamp 11 shown in FIG. 3 includes a fluorescent lamp 12, a base 3, a lighting device 4, a globe 13, and the like. The fluorescent lamp 12 is bent in a bowl shape and has lamp characteristics such as 23 W and 25 W. The base 3 is formed of a heat-resistant synthetic resin such as PBT resin, a screw-type base 5 electrically connected to the commercial AC power source Vs is attached to one end 3a, and a fluorescent lamp 12 is resin or the like on the other end 3b. It is attached using. The fluorescent lamp 12 is covered with a translucent glove 13 attached to the other end 3 b of the base 3. A circuit board 6 supported by the base 3 is provided inside the base 3, and components of the high-frequency lighting device 4 shown in FIG. 2 are mounted on the circuit board 6. The high frequency lighting device 4 is electrically connected to the base 5 and the fluorescent lamp 12 by lead wires (not shown). A power source obtained by converting the commercial AC power source Vs supplied through the base 5 into a direct current is input to the inverter 7. Then, the high-frequency power is output to the fluorescent lamp 12 by the oscillation of the field effect transistors Q1 and Q2 serving as switching elements to turn on the fluorescent lamp 12, and the operation is stopped when the field effect transistor Q1 is destroyed. The base 3 and the globe 13 may be formed with holes for ventilation.
[0038]
When the fluorescent lamp 12 has a half-wave discharge at the end of its life, the N-channel field effect transistor Q1 is immediately destroyed by heat and the fluorescent lamp 12 is extinguished. The bulb-type fluorescent lamp 11 can be replaced immediately. In addition, since the fluorescent lamp 12 is covered with the globe 13, the appearance and merchantability of the bulb-type fluorescent lamp 11 are improved.
[0039]
Next, a third embodiment of the present invention will be described.
[0040]
FIG. 4 is a partially cutaway cross-sectional view of a luminaire showing a third embodiment of the present invention.
[0041]
The lighting fixture 14 shown in FIG. 4 is a portal lamp, and the bulb-type fluorescent lamp 1 shown in FIG. 1 is faced upward and accommodated in the fixture body 15.
[0042]
When the fluorescent lamp 2 reaches the end of its life, the lighting fixture 14 can be provided in which the bulb-type fluorescent lamp 1 is turned off.
[0043]
Next, a fourth embodiment of the present invention will be described.
[0044]
FIG. 5 is a partially cutaway cross-sectional view of a luminaire showing a fourth embodiment of the present invention.
[0045]
The lighting fixture 16 shown in FIG. 5 is a downlight embedded in a ceiling or the like, and the bulb-type fluorescent lamp 11 shown in FIG. 3 is faced down and accommodated in the fixture body 17.
[0046]
When the fluorescent lamp 12 reaches the end of its life, it is possible to provide a lighting fixture 16 in which the bulb-type fluorescent lamp 11 is turned off.
[0047]
In the above-described embodiment, the gate lamp and the downlight have been described as the lighting fixtures. However, the lighting fixture is not limited to these, and any lighting fixture may be used as long as the lighting fixture body accommodates the bulb-type fluorescent lamp of the present invention.
[0048]
【The invention's effect】
According to the first aspect of the present invention, the heat generating component is disposed on the other surface side of the portion of the switch element disposed on the one surface side of the circuit board, and the switch element is opposed to the fluorescent lamp . The switch element is susceptible to heat from the heat-generating component and the fluorescent lamp, and when the fluorescent lamp reaches the end of its life or when the inverter operates abnormally, the switch element can be immediately destroyed by heat to stop the inverter.
[0049]
According to the second aspect of the present invention, the inductor element or the resistive element is a heat-generating component that generates a large amount of heat when the input current increases. Therefore, at the end of the life of the fluorescent lamp, the switch element can be immediately thermally destroyed.
[0050]
According to the invention of claim 3 , since the thickness of the circuit board is 0.5 to 1.0 mm, the heat-generating component can effectively act on the switch element, and the height dimension of the high-frequency lighting device. Can be made small, and the bulb-type fluorescent lamp can be made small.
[0051]
According to the fourth aspect of the present invention, it is possible to provide a lighting fixture in which the bulb-type fluorescent lamp is turned off when the fluorescent lamp reaches the end of its life.
[Brief description of the drawings]
FIG. 1 is a partially cutaway cross-sectional view of a bulb-type fluorescent lamp showing a first embodiment of the present invention.
FIG. 2 is a circuit diagram of the high-frequency lighting device.
FIG. 3 is a partially cutaway cross-sectional view of a bulb-type fluorescent lamp showing a second embodiment of the present invention.
FIG. 4 is a partially cutaway cross-sectional view of a luminaire showing a third embodiment of the present invention.
FIG. 5 is a partially cutaway sectional view of a luminaire showing a fourth embodiment of the present invention.
FIG. 6 is a circuit diagram of a conventional high-frequency lighting device.
FIG. 7 is a state diagram showing the mounting of the thermal fuse on the circuit board.
[Explanation of symbols]
Q1... N-channel field effect transistor Q2 as a switching element... P-channel field effect transistor R1 as a switching element... …… Fluorescent lamp 3 ………… Substrate 4 ………… High-frequency lighting device 5 ………… Base 6 ………… Circuit board 7 ………… Inverters 14, 16 ... Lighting equipment 15 17 ... Lighting fixture body

Claims (4)

A base having a base electrically connectable with a commercial AC power source;
A fluorescent lamp attached to the substrate;
The circuit board is supported by the base, and the circuit board is mounted with an inverter that converts the commercial AC power supplied through the base into a direct current and outputs high-frequency power to the fluorescent lamp by oscillation of a switch element. A high-frequency lighting device in which the switch element is disposed on one surface side of the circuit board facing the fluorescent lamp, and a heat generating component is disposed on the other surface side of the portion where the switch element is disposed; ;
A bulb-type fluorescent lamp characterized by comprising: A base having a base electrically connectable with a commercial AC power source;
A fluorescent lamp attached to the substrate;
The circuit board is supported by the base, and the circuit board is mounted with an inverter that converts the commercial AC power supplied through the base into a direct current and outputs high-frequency power to the fluorescent lamp by oscillation of a switch element. The switch element is disposed on one side of the circuit board, and is connected in series between a rectifier circuit that converts a commercial AC power source into a direct current and the switch element on the other side of the portion where the switch element is disposed . A high-frequency lighting device configured by disposing a heat-generating component composed of an inductor element or a resistance element ;
A bulb-type fluorescent lamp characterized by comprising: A base having a base electrically connectable with a commercial AC power source;
A fluorescent lamp attached to the substrate;
A circuit board having a thickness of 0.5 to 1.0 mm supported by the base body is provided, and a commercial AC power supplied via the base is converted into a direct current from the circuit board, and high frequency power is generated by oscillation of the switch element. An inverter that outputs to the fluorescent lamp is mounted, and the switch element is disposed on one surface side of the circuit board, and a heat generating component is disposed on the other surface side of the portion where the switch element is disposed. With a high frequency lighting device;
A bulb-type fluorescent lamp characterized by comprising: A bulb-type fluorescent lamp according to any one of claims 1 to 3 ;
A luminaire body that houses the bulb-type fluorescent lamp;
The lighting fixture characterized by comprising.

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