JP2009177001A - Electric circuit, lighting device for discharge lamp, and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with a situation wherein a safety valve of an electrolytic capacitor operates and thereby an gasified electrolyte is discharged from inside the electrolytic capacitor. <P>SOLUTION: The electrolytic capacitor 200 includes the safety valve 201 for discharging a gasified electrolyte to prevent the blowout when the electrolyte inside the capacitor is gasified by an increase in temperature in the final stage of its life or for other reasons. An absorbing material 300 absorbs the electrolyte discharged through the safety valve 201 of the electrolytic capacitor 200, thus preventing the leakage of the electrolyte discharged through the safety valve 201 to the outside. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric circuit having an electrolytic capacitor.

When the internal electrolytic solution boils due to temperature rise, the electrolytic capacitor opens a safety valve (explosion-proof valve) to discharge the vaporized electrolytic solution to the outside in order to prevent bursting.
JP 2006-236666 A

When the electrolyte valve vaporized by opening the safety valve of the electrolytic capacitor is discharged to the outside, the discharged electrolyte solution is ejected as water vapor. The electrolyte itself is not dangerous to the human body, but a user who sees it may mistake it for smoke or fire.
Further, since the electrolytic capacitor in which the safety valve is opened and the internal electrolyte is discharged does not operate normally, it is necessary to detect that the safety valve of the electrolytic capacitor has been opened and stop the operation of the circuit.
The present invention has been made, for example, in order to solve the above-described problems. When the electrolytic valve is opened and the electrolytic solution is discharged, the discharged electrolytic solution is not ejected to the outside. The purpose is to deal with.

The electrical circuit according to the present invention is
An electrolytic capacitor having a safety valve for releasing the vaporized electrolyte when the electrolyte is vaporized;
And an absorbent that absorbs the electrolytic solution discharged from the safety valve of the electrolytic capacitor.

  According to the present invention, when the electrolytic solution is discharged from the safety valve of the electrolytic capacitor, the absorbing material absorbs the electrolytic solution, so that the electrolytic solution is not released to the outside, and the user mistakenly recognizes smoke or ignition. Can be prevented.

Embodiment 1 FIG.
Embodiment 1 will be described with reference to FIGS.

FIG. 1 is a perspective view showing an external appearance of a lighting fixture 800 in this embodiment.
The lighting fixture 800 is detachably electrically connected to the discharge lamp LA, applies the AC voltage generated by the discharge lamp lighting device inside the lighting fixture 800 to the electrically connected discharge lamp LA, and lights the discharge lamp LA. It has a lamp socket 801 (discharge lamp connecting portion).

FIG. 2 is a block configuration diagram showing a functional block configuration of the discharge lamp lighting device 810 in this embodiment.
The discharge lamp lighting device 810 includes a current interrupt circuit 811, a rectifier circuit 812, a DC voltage circuit 813, an inverter circuit 814, and a load circuit 815.

The current cut-off circuit 811 cuts off the input current when the current (hereinafter referred to as “input current”) input from the AC power source AC such as a commercial power source to the discharge lamp lighting device 810 becomes larger than a predetermined current. . The current cutoff circuit 811 has, for example, a fuse connected in series with an AC power supply, and cuts off the input current by burning out the fuse when an overcurrent flows.
The rectifier circuit 812 receives a low frequency AC voltage (for example, 100 V to 254 V, 50 Hz to 60 Hz) from the AC power supply AC, rectifies the input low frequency AC voltage, and generates a pulsating voltage. The rectifier circuit 812 has a diode bridge, for example, and full-wave rectifies the input low-frequency AC voltage.
The DC voltage circuit 813 receives the pulsating voltage rectified by the rectifier circuit 812 and generates a DC voltage. The DC voltage circuit 813 includes, for example, a step-up chopper circuit, and generates a high DC voltage (for example, 400 V) from the input pulsating voltage.
The inverter circuit 814 receives the DC voltage generated by the DC voltage circuit 813 and generates a high-frequency rectangular wave AC voltage (for example, 50 kHz to 80 kHz). The inverter circuit 814 has, for example, two or four switching elements, and generates a high-frequency rectangular wave AC voltage by alternately turning on and off the switching elements.
The load circuit 815 serves as a load for the inverter circuit 814 together with the discharge lamp LA electrically connected to the lamp socket 801. The load circuit 815 includes, for example, a choke coil for suppressing a current flowing through the discharge lamp LA, a coupling capacitor for cutting a DC component of a high-frequency rectangular wave AC voltage generated by the inverter circuit 814, and the discharge lamp LA It has a starting capacitor for generating a high voltage at both ends.

  The DC voltage circuit 813 has a large capacity capacitor in order to charge and stabilize the generated DC voltage. The DC voltage circuit 813 has a small and inexpensive electrolytic capacitor as a large-capacity capacitor.

FIG. 3 is a perspective view showing the appearance of a general electrolytic capacitor.
The electrolytic capacitor 200 has a safety valve 201, an anode terminal 202, and a cathode terminal 203, and has an electrolytic solution therein. The electrolytic solution is, for example, an ethylene baricol aqueous solution. The electrolytic capacitor 200 is sealed to prevent evaporation of the internal electrolyte. However, when the temperature of the electrolytic capacitor 200 rises due to the end of life, the electrolytic solution is vaporized, and the pressure inside the electrolytic capacitor 200 increases. If this is left as it is, there is a possibility that the electrolytic capacitor 200 may rupture. Therefore, when the pressure inside the electrolytic capacitor 200 exceeds a predetermined value, the safety valve 201 (explosion-proof valve) is opened, and the vaporized electrolyte is discharged to the outside.

FIG. 4 is a perspective view showing a general printed wiring board 110.
The electric circuit 100 of the discharge lamp lighting device 810 is configured by mounting an electronic component such as an electrolytic capacitor 200 on the printed wiring board 110.
The printed wiring board 110 mounts discrete components such as the electrolytic capacitor 200 on the mounting surface 111. The printed wiring board 110 has wiring formed on the surface (solder surface) opposite to the mounting surface 111 by etching a conductor such as copper foil. Inserting terminals such as an anode terminal 202 and a cathode terminal 203 of discrete components such as an electrolytic capacitor 200 into a through hole 112 provided in the printed wiring board 110, and fixing them to the wiring provided on the wiring surface by soldering or the like. Thus, the electric circuit 100 is formed.

FIG. 5 is a perspective view showing an absorbent material 300 in this embodiment.
The absorbent material 300 is bowl-shaped and has an opening 311 in one direction. The absorbent material 300 is placed on the electrolytic capacitor 200 so as to cover the electrolytic capacitor 200. The absorbent material 300 is an insulating material that can absorb liquid, and is made of a material that can withstand a high temperature of about 100 degrees Celsius (for example, absorbent cotton, sponge, etc.). The absorbent material 300 is fixed to the printed wiring board 110 with, for example, an adhesive or an adhesive.

FIG. 6 is a cutaway perspective view showing a part of the electric circuit 100 in this embodiment.
The absorbent material 300 covers the periphery of the electrolytic capacitor 200 so that the opening 311 is covered with the electrolytic capacitor 200 and no gap is formed between the absorbent material 300 and the printed wiring board 110. The absorbent material 300 is arranged so as not to prevent the safety valve 201 from opening. When the absorbent material 300 is a hard substance, a gap is provided between the absorbent material 300 and the safety valve 201. When the absorbent material 300 is a flexible material such as absorbent cotton, it is not necessary to provide a gap with the safety valve 201.

FIG. 7 is a cutaway perspective view showing how the safety valve 201 of the electrolytic capacitor 200 operates in the electric circuit 100 according to this embodiment.
When the temperature of the electrolytic capacitor 200 rises and the electrolytic solution is vaporized, the pressure inside the electrolytic capacitor 200 increases and the safety valve 201 opens. When the safety valve 201 is opened, the electrolytic solution in the electrolytic capacitor 200 is discharged from the safety valve 201 as high-temperature water vapor. Since the discharged electrolyte solution is absorbed by the absorbent material 300, it does not scatter to the outside of the absorbent material 300.
Therefore, the electrolytic solution is not discharged from the discharge lamp lighting device 810 like white smoke, and the user can be prevented from misidentifying it as smoke or fire.

The absorbent material 300 is preferably an amount that can completely absorb the electrolytic solution inside the electrolytic capacitor 200. This is because the electrolytic solution released from the safety valve 201 is a part of the electrolytic solution inside the electrolytic capacitor 200, but even if all the electrolytic solution is released, the absorbent material 300 can absorb it.
Moreover, it is preferable that the part facing the safety valve 201 in the absorbent material 300 has a sufficient thickness. This is to prevent the electrolytic solution released from the safety valve 201 from leaking outside through the absorbent material 300.

  The electric circuit 100 in this embodiment absorbs the electrolytic capacitor 200 having the safety valve 201 that discharges the evaporated electrolytic solution and the electrolytic solution released from the safety valve 201 of the electrolytic capacitor 200 when the electrolytic solution is vaporized. Since the absorbent 300 is included, the electrolyte discharged from the safety valve 201 is not released to the outside of the electric circuit 100, and it is possible to prevent the user (end user) from misidentifying it as smoke or fire.

  The absorbent material 300 in this embodiment covers the periphery of the electrolytic capacitor 200 and prevents the electrolytic solution discharged from the safety valve 201 from scattering to the outside, so that the electrolytic solution discharged from the safety valve 201 is transferred to the electric circuit 100. It can be prevented from being misidentified as smoke or fire.

  The discharge lamp lighting device 810 in this embodiment has the electric circuit 100, and the electric circuit 100 receives an AC voltage and generates an AC voltage to be applied to the discharge lamp from the input AC voltage. It is possible to prevent the electrolyte discharged from 201 from being discharged to the outside of the discharge lamp lighting device 810, and the user of the discharge lamp lighting device 810 from misidentifying it as smoke or fire.

  The lighting fixture 800 in this mounting form is a discharge lamp that detachably electrically connects the discharge lamp lighting device 810 and the discharge lamp LA, and applies an AC voltage generated by the discharge lamp lighting device 810 to the discharge lamp LA. Since it has an electric light connection part (lamp socket 801), the electrolyte discharged from the safety valve 201 is not released to the outside of the lighting fixture 800, and it is possible to prevent the user of the lighting fixture 800 from misidentifying it as smoke or ignition. it can.

  The discharge lamp device (discharge lamp lighting device 810) described above requires a DC voltage circuit 813 obtained by smoothing the pulsating voltage obtained by full-wave rectification of the commercial power supply (AC power supply AC) by the electrolytic capacitor 200. In the electric lamp apparatus, the absorbent 300 that absorbs water vapor is disposed near the head of the electrolytic capacitor 200 mounted on the printed circuit board (printed wiring board 110) of the discharge lamp apparatus. The liquid is not ejected as water vapor, and it can be prevented from being confused to the user without being mistaken for ignition and smoke.

  Further, in the case where the mounting form of the electrolytic capacitor 200 is arranged upright in the vertical direction of the substrate (printed wiring board 110), the shape of the absorbent 300 that absorbs water vapor is different from that of the electrolytic capacitor 200 in the head and Since the structure is covered, the electrolytic solution discharged from the safety valve 201 at the head of the electrolytic capacitor 200 can be efficiently absorbed.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS.
In addition, about the part which is common in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

FIG. 8 is a perspective view showing a state where the electrolytic capacitor 200 according to this embodiment is mounted on the printed wiring board 110.
In this embodiment, the case where the electrolytic capacitor 200 is mounted on the printed wiring board 110 in a state where it is tilted sideways as shown in FIG. 8 will be described.

FIG. 9 is a perspective view showing an absorbent material 300 in this embodiment.
The absorbent material 300 has a shape obtained by cutting the absorbent material 300 described in Embodiment 1 in half, and has an opening 311 and an opening 312 in two directions.

FIG. 10 is a cutaway perspective view showing a part of the electric circuit 100 in this embodiment.
The absorbent material 300 is installed so that the opening 311 covers the electrolytic capacitor 200 and covers the head portion of the electrolytic capacitor 200 with the safety valve 201. The bottom portion of the electrolytic capacitor 200 where the anode terminal 202 and the cathode terminal 203 are located protrudes from the opening 312 and is not covered with the absorbent material 300.

  The electrolytic solution released from the safety valve 201 is vigorously released to the front of the safety valve 201 by the pressure inside the electrolytic capacitor 200. If the absorbent material 300 located in front of the safety valve 201 sufficiently absorbs the electrolytic solution, the electrolytic solution can be prevented from scattering from the bottom side that is not covered by the absorbent material 300.

The absorbent material 300 may cover the entire side surface of the electrolytic capacitor 200 main body, or may cover approximately half of the electrolytic capacitor 200 main body.
Even when the electrolytic capacitor 200 is mounted sideways, the absorbent material 300 may completely cover the entire electrolytic capacitor 200 as in the first embodiment.

  In the discharge lamp device (discharge lamp lighting device 810) described above, when the head of the electrolytic capacitor 200 is disposed in the horizontal direction with respect to the printed circuit board (printed wiring board 110), the absorbent material 300 that absorbs water vapor. Is disposed on an extension line in the vicinity of the electrolytic capacitor 200 head, and is covered with a length longer than the side surface of the main body of the electrolytic capacitor 200, so that the electrolyte discharged from the safety valve 201 can be efficiently absorbed.

Embodiment 3 FIG.
A third embodiment will be described with reference to FIGS.
In addition, about the part which is common in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

FIG. 11 is an exploded perspective view showing the inside of the discharge lamp lighting device 810 in this embodiment.
Note that electronic components other than the electrolytic capacitor 200 are omitted.
The discharge lamp lighting device 810 has a case 820.
The printed wiring board 110 has an elongated plate shape.
Case 820 houses printed wiring board 110 on which electrolytic capacitor 200 is mounted.
The case 820 has a left side 821, a right side 822, and a bottom 823. The left side surface 821 and the right side surface 822 cover the short side direction of the printed wiring board 110, and the bottom surface 823 covers the solder surface of the printed wiring board 110. The other three directions are open.

FIG. 12 is a perspective view showing an absorbent material 300 in this embodiment.
The absorbent material 300 is U-shaped or U-shaped. The absorbent material 300 has an opening 311, an opening 312, and an opening 313 in three directions.

FIG. 13 is a cutaway perspective view showing a discharge lamp lighting device 810 in this embodiment.
The absorbent material 300 is disposed so as to cover the electrolytic capacitor 200. The absorbent material 300 has the opening 312 and the opening 313 facing the left side 821 and the right side 822 of the case 820, and covers the electrolytic capacitor 200 with the absorbent 300, the case 820, and the printed wiring board 110.

  Thus, if the electrolytic capacitor 200 is covered using the side surface of the case 820 or the like, the absorbent material 300 does not necessarily have to cover the entire periphery of the electrolytic capacitor 200.

Embodiment 4 FIG.
The fourth embodiment will be described with reference to FIGS.
In addition, the same code | symbol is attached | subjected about the part which is common in Embodiment 1 and Embodiment 3, and description is abbreviate | omitted here.

FIG. 14 is a perspective view showing the external appearance of the discharge lamp lighting device 810 in this embodiment.
The case 820 further has an upper surface 824, and two directions corresponding to the longitudinal direction of the printed wiring board 110 are opened.

FIG. 15 is a cutaway perspective view showing the inside of the discharge lamp lighting device 810 in this embodiment.
There are two absorbents 300 that close the opening of the case 820.
As a result, the electrolyte discharged from the safety valve 201 of the electrolytic capacitor 200 is prevented from splashing outside through the opening of the case 820.

  The electric circuit 100 in this embodiment has a case 820 that covers the periphery of the electrolytic capacitor 200 and has an opening, and the absorber 300 closes the opening of the case 820 and is discharged from the safety valve 201. Therefore, the electrolytic solution released from the safety valve 201 is not released to the outside of the case 820, and the user can be prevented from misidentifying smoke or fire.

  In the discharge lamp device (discharge lamp lighting device 810) described above, the longitudinal direction of the case 820 is sealed with the absorbent material 300, so that the electrolyte is not discharged outside the discharge lamp lighting device 810.

  In the discharge lamp lighting device 810, a terminal block for connecting a wiring connected to the AC power source AC or the discharge lamp LA is usually provided at the longitudinal end portion of the printed wiring board 110, so that an opening is formed around the terminal block. There is a department. In this embodiment, since the absorbent member 300 closes and seals the opening, the electrolyte discharged from the safety valve 201 is not released outside the discharge lamp lighting device 810.

  In a discharge lamp lighting device used outdoors or indoors, it is obliged to store a charging part (electrolytic capacitor 200) and an iron core part (coil, transformer, etc.) in a metal shell (case 820). Therefore, by sealing the opening of the case 820 with the absorbent material 300, the electrolyte discharged from the safety valve 201 can be prevented from being discharged outside the discharge lamp lighting device 810.

Embodiment 5 FIG.
The fifth embodiment will be described with reference to FIGS.
In addition, about the part which is common in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

FIG. 16 is a perspective view showing the appearance of case 400 in this embodiment.
The case 400 has a cup shape made of metal or resin, and has an opening 401 in one direction.
A fixed terminal 410 is provided at the edge of the opening 401. The fixed terminal 410 is a protrusion for fixing the case 400 by being inserted into the through hole 112 of the printed wiring board 110.
When the case 400 is made of metal, the fixing terminal 410 may be fixed by soldering to the printed wiring board 110. In that case, the fixed terminal 410 is electrically connected to the cathode terminal 203 of the electrolytic capacitor 200 so that the potential of the case 400 is the same as that of the main body of the electrolytic capacitor 200.

FIG. 17 is a cutaway perspective view showing a part of the electric circuit 100 in this embodiment.
The case 400 has an absorbent material 300 inside and is used by being placed on the electrolytic capacitor 200. The case 400 includes electrodes 431 and 432 connected to the absorbent material 300. A lead wire 421 is electrically connected to the electrode 431, and a lead wire 422 is electrically connected to the electrode 432.

The absorbent material 300 is positioned in front of the safety valve 201 of the electrolytic capacitor 200 and absorbs the electrolytic solution when the electrolytic solution is released from the safety valve 201.
An electrode 431 (first electrode) is connected to one side of the absorbent material 300, and an electrode 432 (second electrode) is connected to the opposite side of the electrode 431. The absorbent material 300 is made of an insulating material, and the electrode 431 and the electrode 432 are insulated when the absorbent material 300 does not absorb the electrolyte. Further, when the absorbing material 300 absorbs the electrolytic solution, the electrode 431 and the electrode 432 are electrically connected through the electrolytic solution absorbed by the absorbing material 300. Therefore, by measuring whether or not the lead wires 421 and 422 electrically connected to the electrodes 431 and 432 are electrically connected, whether or not the safety valve 201 of the electrolytic capacitor 200 is operated and the electrolytic solution is discharged is determined. I understand.

  Note that in the case where the case 400 is made of metal, the electrode 431 (or the electrode 432) is electrically connected to the case 400, and the lead wire 421 (or the lead wire 422) may be omitted.

  Further, in order for the safety valve 201 to operate normally, the distance (for example, 3 mm) or more recommended by the manufacturer of the electrolytic capacitor 200 is between the safety valve 201 and the absorbent material 300, the electrodes 431, 432, or the case 400. Need to be separated.

FIG. 18 is an electric circuit diagram showing a part of the circuit configuration of the discharge lamp lighting device 810 in this embodiment.
The current interrupt circuit 811 has a fuse F11.
The rectifier circuit 812 has a diode bridge DB.
The DC voltage circuit 813 has an electrolytic capacitor 200.
The switch 830 is an equivalent circuit of the electrodes 431 and 432 and the absorbent material 300.

  In this example, the lead wire 421 is electrically connected to the anode terminal 202 of the electrolytic capacitor 200, and the lead wire 422 is electrically connected to the cathode terminal 203 of the electrolytic capacitor 200. Therefore, the switch 830 is electrically connected in parallel with the electrolytic capacitor 200.

  When the electrolytic solution is discharged from the safety valve 201 of the electrolytic capacitor 200, the switch 830 is turned on (conduction between the electrode 431 and the electrode 432), and the electrolytic capacitor 200 is short-circuited. Then, a large current flows through a circuit including the AC power supply AC, the fuse F11, the diode bridge DB, and the switch 830, and the input current of the discharge lamp lighting device 810 becomes larger than the rated current of the fuse F11. Therefore, the fuse F11 is disconnected, Cut off the input current.

  Thereby, it is possible to detect that the electrolytic capacitor 200 is broken and to safely stop the operation of the discharge lamp lighting device 810.

  In this example, the switch 830 is electrically connected in parallel with the electrolytic capacitor 200, and the fuse F11 is disconnected when the electrolytic capacitor 200 fails to cut off the input current of the discharge lamp lighting device 810. However, the switch 830 It is also possible to provide a measurement circuit that measures whether or not is conducting, and the current interrupt circuit 811 blocks the input current based on the measurement result of the measurement circuit.

  The absorbent material 300 in this embodiment is an insulating material, and the electric circuit 100 is further connected to the first electrode 431 connected to the absorbent material 300 and the absorbent material 300, and the absorbent material 300 is When the electrolytic solution discharged from the safety valve 201 is absorbed, the first electrode 431 is electrically connected to the first electrode 431 through the electrolytic solution absorbed by the absorbent material 300. There is an effect that it is possible to detect that the electrolytic solution has been discharged from the safety valve 201 depending on whether or not the electrode 431 and the second electrode 432 are electrically connected.

  The electric circuit 100 in this embodiment further includes a current cut-off circuit 811 that cuts off an input current input by the electric circuit 100 when the first electrode 431 and the second electrode 432 are electrically connected. Therefore, when the electrolytic solution is discharged from the safety valve 201, the operation of the electric circuit 100 can be safely stopped.

  The first electrode 431 in this embodiment is electrically connected to one terminal (anode terminal 202) of the electrolytic capacitor 200, and the second electrode 432 is connected to the other terminal (cathode terminal 203) of the electrolytic capacitor 200. When the input current becomes larger than a predetermined current, the current cut-off circuit 811 cuts off the input current. Therefore, a circuit for detecting a failure of the electrolytic capacitor 200 or a current cut-off circuit 811 The structure is simple, the number of parts of the electric circuit 100 can be reduced, and the electric circuit 100 can be reduced in size, cost, and power consumption.

  The electric circuit 100 in this embodiment includes an electrolytic capacitor 200 having a safety valve 201 that discharges the vaporized electrolytic solution when the electrolytic solution is vaporized, covers the periphery of the electrolytic capacitor 200, and the safety valve 201 of the electrolytic capacitor 200. And the case 400 that prevents the electrolytic solution discharged from the outside from being scattered outside, even when the absorbent 300 cannot absorb the electrolytic solution discharged from the safety valve 201, the electrolytic solution is outside the case 400. It is not released, and it is possible to prevent users from misidentifying smoke and fire.

  Since the case 400 in this embodiment is a conductive substance (metal) and is electrically connected to the cathode terminal 203 of the electrolytic capacitor 200, there is an effect that the case 400 and the outer periphery of the electrolytic capacitor 200 have the same potential. Play. Therefore, it is safe even if the case 400 touches the outer periphery of the electrolytic capacitor 200.

  The discharge lamp device (discharge lamp lighting device 810) described above requires a DC voltage circuit 813 obtained by smoothing the pulsating voltage obtained by full-wave rectification of the commercial power supply (AC power supply AC) by the electrolytic capacitor 200. In the electric lamp apparatus (discharge lamp lighting apparatus 810), the metal case 400 covers the periphery of the electrolytic capacitor 200 mounted on the printed circuit board (printed wiring board 110) of the discharge lamp apparatus (discharge lamp lighting apparatus 810). Is not released to the outside of the case 400.

  Further, when the electrolytic solution is discharged, the electrolytic capacitor 200 is short-circuited and the fuse F11 is disconnected, so that the operation of the discharge lamp lighting device 810 can be safely stopped.

  Although the case where the electrolytic capacitor 200 is mounted on the printed wiring board 110 in an upright state has been described here, the electrolytic capacitor 200 may be mounted sideways.

Embodiment 6 FIG.
The sixth embodiment will be described with reference to FIGS.
Note that portions common to Embodiments 1 and 5 are denoted by the same reference numerals, and description thereof is omitted here.

FIG. 19 is a perspective view showing the appearance of case 400 in this embodiment.
The case 400 has a cylindrical shape made of resin or metal, and has an opening 401 in one direction and an opening 402 in a direction opposite to the opening 401.
At the edge of the opening 401, there is a claw-like protrusion 415 that warps outward. The claw-like projection 415 is a projection for fixing the case 400 by being inserted into the through hole 112 of the printed wiring board 110. When the claw-like protrusion 415 is inserted into the through hole 112, the tip curved outward of the claw-like protrusion 415 is caught by the printed wiring board 110, and the case 400 is fixed to the printed wiring board 110.

FIG. 20 is a cutaway perspective view showing a part of the electric circuit 100 in this embodiment.
Case 400 has an absorbent material 300 therein. The absorbent material 300 closes the opening 402 of the case 400 so that the electrolyte discharged from the safety valve 201 of the electrolytic capacitor 200 does not leak outside through the opening 402.

  Thus, by providing the case 400 that covers the electrolytic capacitor 200 alone and providing the absorbent material 300 inside the case 400, the electrolyte discharged from the safety valve 201 is not released to the outside of the case 400, and the user emits smoke.・ Prevents misidentification as fire.

  Although the case where the electrolytic capacitor 200 is mounted on the printed wiring board 110 in an upright state has been described here, the electrolytic capacitor 200 may be mounted sideways.

FIG. 3 is a perspective view illustrating an appearance of a lighting fixture 800 according to Embodiment 1. FIG. 3 is a block configuration diagram showing a functional block configuration of a discharge lamp lighting device 810 according to Embodiment 1. The perspective view which shows the external appearance of a general electrolytic capacitor. The perspective view which shows the general printed wiring board 110. FIG. FIG. 3 is a perspective view showing an absorbent material 300 according to Embodiment 1. FIG. 2 is a cutaway perspective view showing a part of electric circuit 100 in the first embodiment. FIG. 2 is a cutaway perspective view showing how the safety valve 201 of the electrolytic capacitor 200 operates in the electric circuit 100 according to the first embodiment. The perspective view which shows a mode that the electrolytic capacitor 200 in Embodiment 2 was mounted in the printed wiring board 110. FIG. The perspective view which shows the absorber 300 in Embodiment 2. FIG. FIG. 5 is a cutaway perspective view showing a part of electric circuit 100 in the second embodiment. FIG. 10 is an exploded perspective view showing the inside of a discharge lamp lighting device 810 according to Embodiment 3. FIG. 6 is a perspective view showing an absorbent material 300 according to Embodiment 3. FIG. 9 is a cutaway perspective view showing a discharge lamp lighting device 810 in the third embodiment. FIG. 10 is a perspective view showing an appearance of a discharge lamp lighting device 810 according to Embodiment 4. FIG. 6 is a cutaway perspective view showing the inside of a discharge lamp lighting device 810 according to Embodiment 4. FIG. 10 is a perspective view showing an appearance of a case 400 in the fifth embodiment. FIG. 10 is a cutaway perspective view showing a part of electric circuit 100 in the fifth embodiment. FIG. 10 is an electric circuit diagram showing a part of a circuit configuration of a discharge lamp lighting device 810 according to Embodiment 5. FIG. 20 is a perspective view showing an appearance of a case 400 in the sixth embodiment. FIG. 10 is a cutaway perspective view showing a part of electric circuit 100 in the sixth embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Electrical circuit, 110 Printed wiring board, 111 Mounting surface, 112 Through-hole, 200 Electrolytic capacitor, 201 Safety valve, 202 Anode terminal, 203 Cathode terminal, 300 Absorbent, 311 to 313, 401, 402 Opening, 400 Case, 410 Fixed terminal, 415 Claw-shaped protrusion, 421, 422 Lead wire, 431, 432 Electrode, 800 Lighting fixture, 801 Lamp socket, 810 Discharge lamp lighting device, 811 Current cut-off circuit, 812 Rectifier circuit, 813 DC voltage circuit, 814 Inverter circuit , 815 load circuit, 820 case, 821 left side, 822 right side, 823 bottom, 824 top, 830 switch, AC AC power supply, DB diode bridge, F11 fuse, LA discharge lamp.

Claims (10)

An electrolytic capacitor having a safety valve for releasing the vaporized electrolyte when the electrolyte is vaporized;
An electric circuit comprising: an absorbent that absorbs the electrolytic solution discharged from the safety valve of the electrolytic capacitor. The absorbent material is an insulating material,
The electrical circuit is
A first electrode connected to the absorber;
A second electrode connected to the absorbent material and electrically connected to the first electrode via the electrolytic solution absorbed by the absorbent material when the absorbent material absorbs the electrolytic solution discharged from the safety valve; The electric circuit according to claim 1, comprising: The electrical circuit is
3. The electric circuit according to claim 2, further comprising a current cut-off circuit that cuts off an input current input by the electric circuit when the first electrode and the second electrode are electrically connected. 4. The first electrode is electrically connected to one terminal of the electrolytic capacitor,
The second electrode is electrically connected to the other terminal of the electrolytic capacitor;
4. The electric circuit according to claim 3, wherein the current cut-off circuit cuts off the input current when the input current becomes larger than a predetermined current.   5. The electric circuit according to claim 1, wherein the absorbing material covers the periphery of the electrolytic capacitor and prevents the electrolytic solution discharged from the safety valve from scattering to the outside. The electrical circuit is
Covering the periphery of the electrolytic capacitor, having a case with an opening,
5. The electric circuit according to claim 1, wherein the absorbent material closes an opening of the case and prevents the electrolytic solution discharged from the safety valve from scattering to the outside. An electrolytic capacitor having a safety valve for releasing the vaporized electrolyte when the electrolyte is vaporized;
An electric circuit comprising a case that covers the periphery of the electrolytic capacitor and prevents the electrolytic solution discharged from the safety valve of the electrolytic capacitor from scattering to the outside.   8. The electric circuit according to claim 7, wherein the case is made of a conductive material and is electrically connected to a cathode terminal of the electrolytic capacitor. An electric circuit according to any one of claims 1 to 8,
The electric circuit receives an AC voltage and generates an AC voltage to be applied to the discharge lamp from the input AC voltage. A discharge lamp lighting device according to claim 9,
A lighting fixture comprising: a discharge lamp connecting portion that electrically connects the discharge lamp in a detachable manner and applies an AC voltage generated by the discharge lamp lighting device to the discharge lamp.

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