JP2002075677A - High-voltage electric discharge lamp lighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect effectively an electronic ballast and a high-voltage electric- discharge lamp when abnormalities like a half-wave discharge phenomenon or a slow leak phenomenon occur in the last stage of the life of the high-voltage electric-discharge lamp. SOLUTION: In high-voltage electric-discharge lamp lighting equipment equipped with power sources 1 and 2, electronic ballasts 2 and 3 which consist of printed circuit boards and electronic parts containing a protection element 29, and the high-voltage electric-discharge lamp 4, the protection element 29 is arranged in a part where the unusual phenomenon of the high-voltage electric- discharge lamp 4 like the half-wave discharge or the slow leak can be detected. For example, a thermal protector 29 as a protection element, is attached in a high-voltage pulse transformer 16 which is connected in series with the high- voltage electric-discharge lamp 4, and if an unusual temperature rise occurs, the power-source supply is intercepted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure discharge lamp device using a high-pressure discharge lamp lit by a ballast.
The present invention relates to a technique for detecting an abnormal state such as half-wave discharge and slow leak at the end of life of a high-pressure discharge lamp and protecting the high-pressure discharge lamp and the high-pressure discharge lamp lighting device.

[0002]

2. Description of the Related Art As a lighting device for lighting a high pressure discharge lamp, a copper iron ballast has conventionally been the mainstream. However, recently, so-called electronic ballasts using electronic components have been becoming mainstream for the purpose of reducing the weight, size, and enhancing the function of ballasts. This electronic ballast will be briefly described below.

FIG. 1 is a block diagram of a conventional electronic ballast. A DC power supply circuit 2 including a rectifier circuit is connected to an AC power supply 1, and a high-pressure discharge lamp 4 is connected to an output side of the DC power supply circuit 2 via an inverter circuit 3. The inverter circuit 3 adjusts and controls the power supplied to the high-pressure discharge lamp 4.

FIG. 2 is a diagram showing an example of a specific circuit of a conventional electronic ballast. This electronic ballast circuit includes a DC power supply circuit 2 and an inverter circuit 3. DC power supply circuit 2
Has a rectifier circuit 5, a chopper circuit and a control circuit 26 thereof. The chopper circuit includes an inductance 23, a switching element 24, a diode 25, and a capacitor 6. The DC power supply circuit 2 converts an AC voltage of the AC power supply 1 into a desired DC voltage.

The inverter circuit 3 includes a step-down chopper circuit 2
0, a polarity inversion circuit 21, an igniter circuit 22, and a control circuit 11. The step-down chopper circuit 20 includes a switching element 7, a diode 8, an inductance 9, and a capacitor 10. Since the operation of the step-down chopper circuit 20 is well known, the description is omitted. The polarity inversion circuit 21 includes switching elements 12 to 15, and these four switching elements constitute a bridge circuit.

FIG. 3 is a time chart showing the on / off state of each of the switching elements 12 to 15. The rectangular wave AC power is supplied to the high-pressure discharge lamp 4 by the switching elements 12 to 15 performing such an operation.

In FIG. 2, the igniter circuit 22 includes a pulse transformer 16, a capacitor 17, a switching element 18 (for example, a voltage responsive element such as a Sidac), and a resistor 19.

FIG. 4 is a time chart showing the operation of the igniter circuit 22. A rectangular wave voltage as shown in (a) is generated by the polarity inversion circuit 21, whereby the capacitor 17 is gradually charged according to the time constant of the resistor 19 and the capacitor 17. As a result, the capacitor 17
Has a waveform as shown in FIG. Capacitor 1
When the voltage at 7 reaches the breakover voltage Vbo of the switching element 18, the switching element 18 is turned on, and the electric charge accumulated in the capacitor 17 is discharged through the switching element 18 and the primary winding of the pulse transformer 16.

At this time, the pulse voltage generated in the primary winding of the pulse transformer 16 is boosted, and a high-voltage pulse voltage of several kV is generated in the secondary winding. Then, the high-pressure discharge lamp 4 starts discharging by the high-voltage pulse voltage, and shifts to a lighting state. Further, the control circuit 11 detects the lamp voltage V1a (which may be current or power) of the high-pressure discharge lamp 4, performs on / off control of the switching element 7 according to the lamp voltage, and controls the power supplied to the high-pressure discharge lamp 4. Make adjustments.

It is generally known that the following two kinds of phenomena occur at the end of the life of such a high-pressure discharge lamp. The first phenomenon is a half-wave discharge phenomenon in which, when the high-pressure discharge lamp 4 is AC-lit, it has a rectifying action in one polarity and discharge continues.

FIG. 5 shows a pseudo-circuit often used for explaining such a half-wave discharge phenomenon, which is a series-parallel circuit of a resistor and a diode.

The second phenomenon is a slow leak phenomenon in which gas in the arc tube of the high-pressure discharge lamp 4 leaks into the outer tube, and discharge continues at a lamp voltage lower than usual.

The operation of the electronic ballast when the above two kinds of abnormal phenomena occur in the lamp will be described.

FIG. 6 is a table showing a comparison of electrical characteristics when a 70 W metal halide lamp is turned on by an electronic ballast. As can be seen from this table, in an abnormal state of slow leak or half-wave discharge, the lamp current increases as compared with the rated lighting, but the power consumption is equal to or less than the rated lighting. Therefore, even if such an abnormal state occurs, the current fuse or the like provided at the input portion of the electronic ballast does not operate, and the electronic ballast continues to operate.

However, in such an abnormal state, since the lamp current is abnormally large as shown in FIG. 6, components (pulse transformer 16 and switching elements 12 to 12) in the electronic ballast through which the same current as the lamp current flows. Regarding 15), the loss increases and the temperature rise becomes abnormally large. Therefore, if the operation of the electronic ballast continues in such a state,
The stress on these components will increase and will shorten the life of the electronic ballast.

As a method for solving such a problem, a protection circuit has conventionally been provided which detects the lamp current and stops the operation of the electronic ballast if the lamp current does not rise to a predetermined voltage after a predetermined time has elapsed. It is used.

[0017]

Although such a protection circuit is effective for the through-leakage phenomenon, it does not work effectively for the half-wave discharge phenomenon in which the lamp voltage repeatedly rises and falls for each polarity.

A protection circuit may be considered in which the lamp current is detected and the operation of the electronic ballast is stopped if the lamp current does not drop below the predetermined current even after the predetermined time has elapsed. It works effectively on the leak phenomenon but not on the half-wave discharge phenomenon.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been developed in the event that an abnormality such as a half-wave discharge phenomenon or a slow leak phenomenon occurs at the end of the life of a high pressure discharge lamp. And high-pressure discharge lamps.

[0020]

According to a first aspect of the present invention, there is provided a high-pressure discharge lamp lighting apparatus comprising: a power supply; an electronic ballast including an electronic component including at least one protection element; a printed circuit board; In the high pressure discharge lamp lighting device provided, the protection element is disposed at a position where an abnormal phenomenon of the high pressure discharge lamp such as half-wave discharge or slow leak can be detected.

According to such a configuration, when a phenomenon such as half-wave discharge or slow leak occurs in the high-pressure discharge lamp,
Since the protection element can detect this and shut off the power supply, the high-pressure discharge lamp and the electronic ballast are protected.

A high pressure discharge lamp lighting device according to a second aspect is characterized in that the protection element is a thermal protector attached to a component connected in series to the high pressure discharge lamp.

A high pressure discharge lamp lighting device according to a third aspect is characterized in that the electronic component includes a high voltage pulse transformer that generates a high voltage pulse voltage for starting the high pressure discharge lamp.

A high pressure discharge lamp lighting device according to a fourth aspect is characterized in that the high pressure pulse transformer is connected in series to the high pressure discharge lamp, and the thermal protector is attached to the high pressure pulse transformer.

According to a fifth aspect of the present invention, in the high pressure discharge lamp lighting device, when the board block in which the electronic component is mounted on the printed board is housed in a case and the compound is filled to improve moisture proofing, A thermal protector is mounted at a position where the thermal protector is not buried in the compound.

According to a sixth aspect of the present invention, in the high pressure discharge lamp lighting device, the printed board includes an electronic component mounting portion and transport dummy portions formed on both sides thereof, and the transport dummy portion includes the printed board. Is used for fixing to the case.

According to a seventh aspect of the present invention, in the high pressure discharge lamp lighting device, the electronic component includes a plurality of semiconductor elements mounted on a radiator plate, and the radiator plate has two planes connected in an L-shaped cross section. A semiconductor element that operates at a high frequency among the plurality of semiconductor elements is mounted on one plane, and a semiconductor element that operates at a low frequency is mounted on the other plane.

[0028] In the high pressure discharge lamp lighting device according to claim 8, the electronic component includes a plurality of semiconductor elements mounted on a radiator plate, and the radiator plate has a plurality of positioning holes formed in the printed board. A plurality of foot portions to be inserted into the heat sink, the protrusion length of the foot portion is formed longer than the protrusion length of the lead of the plurality of semiconductor elements attached to the heat sink, and the plurality of semiconductor elements are attached. After the heat sink is positioned and inserted into the printed circuit board, notches are formed on both sides of the foot so that the tip of the foot can be cut off.

In the high pressure discharge lamp lighting device according to the ninth aspect, the electronic component includes a plurality of semiconductor elements mounted on a radiator plate, and the radiator plate has a plurality of positioning holes formed in the printed circuit board. A plurality of foot portions to be inserted into the heat sink, the protrusion length of the foot portion is formed longer than the protrusion length of the lead of the plurality of semiconductor elements attached to the heat sink, and the plurality of semiconductor elements are attached. A cutout is formed on one side of the foot so that the tip of the foot can be bent after the heat sink is positioned and inserted into the printed circuit board.

A high pressure discharge lamp lighting device according to claim 10 is
The electronic ballast includes a DC power supply circuit including a rectifier circuit, a step-down chopper circuit connected to an output side of the DC power supply circuit, and a polarity inversion circuit connected to an output side of the step-down chopper circuit, The step-down chopper circuit includes at least one switching element, a diode, an inductance, and a capacitor, and the polarity inversion circuit converts a current supplied to a high-pressure discharge lamp connected as a load to an output side thereof into an AC current. And

A high pressure discharge lamp lighting device according to claim 11 is
The polarity inversion circuit includes two sets of switching paths connected in parallel to an output side of the step-down chopper circuit, and each switching path includes two switching elements connected in series. The high-pressure discharge lamp is connected between the other switching path and the center point.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 shows a circuit configuration of the high pressure discharge lamp lighting device according to the first embodiment of the present invention.
This embodiment is different from the conventional electronic ballast shown in FIG. 2 in that the thermal protector 2 is connected to the input circuit of the DC power supply circuit 2.
9 and the thermal protector 29 is attached so as to be close to the pulse transformer 16 through which the lamp current flows. Thereby, when the high-pressure discharge lamp 4 enters a slow leak state or a half-wave discharge state, the thermal protector 29 detects a temperature rise of the pulse transformer 16 and
The power supply to the DC power supply circuit 2 is cut off. Thus, the lamp (high-pressure discharge lamp) 4 and the electronic ballast are protected.

The thermal protector 29 is not limited to a return type thermal protector, but may be a thermal fuse. However, if the lamp abnormal phenomenon occurs multiple times during the life of the electronic ballast, it is better to use a return-type thermal protector.

FIG. 8 shows an example of the structure of a high pressure discharge lamp lighting device according to a second embodiment of the present invention. FIG. 8B
Now, a block in which a thermal protector 29 is attached to the pulse transformer 16 and mounted on the printed circuit board 31 (hereinafter referred to as a block)
(Referred to as a substrate block) in a case 30. In FIG. 8A, the compound 32 is further filled to increase the moisture resistance of the substrate block. At this time, the thermal protector 29 is attached at a position that is not buried in the compound 32.

In this way, the thermal protector 29 operates at the same temperature when the compound 32 is filled or not depending on the application using the common substrate block. If the thermal protector 29 is buried in the compound 32,
The rise in the temperature of the pulse transformer 16 and its effect on the thermal protector 29 are different from those when the compound is not buried in the compound 32, and the thermal protector 29 does not operate at the same temperature. In this case, it is necessary to use thermal protectors 29 having different operating temperatures. In this embodiment, since the thermal protector 29 is mounted at a position that is not buried in the compound 32, a common substrate block can be used even when the compound 32 is not filled depending on the application.

FIG. 9 shows an example of a printed circuit board used in a high pressure discharge lamp lighting device according to a third embodiment of the present invention. In the embodiment shown in FIG. 8, in the case of (a), the compound 32 is filled in the case 30, so that it is not always necessary to fix the printed circuit board 31 to the case 30. However, in the case of (b), since the compound is not filled, it is necessary to fix the printed circuit board 31 to the case 30 by some method.

In this embodiment, the transport dummy portions DP necessary for flowing the printed board 31 into the solder bath are provided on both sides of the electronic component mounting portion AP.
The printed circuit board 31 is fixed to the case 30 by diverting the transfer holes HL formed in P. For example, the hole HL for conveyance is also used as a hole for screwing. In the case of FIG.
Unnecessary dummy portions DP can be removed. In this way, in the embodiment shown in FIG. 8, the printed circuit board can be shared between the case (a) and the case (b).

FIG. 10 shows an example of the arrangement of circuit components on a printed circuit board used in a high pressure discharge lamp lighting device according to a fourth embodiment of the present invention. When the components of the circuit shown in FIG. 2 are mounted on the printed circuit board 31, the input lines and the output lines are connected to the printed circuit board 31 as shown in FIG. It is preferable that they are connected to the same side. In this case, it is preferable that the circuit components are arranged from the input side to the output side as shown by arrows in FIG.

In the case of an electronic ballast suitable for a lamp of 100 W or more, the temperature rise of each circuit component is large. In particular, the semiconductor elements 5, 7, 8, 12 to 15, 24, and 25 need to be attached to a heat sink. . In the present embodiment, as shown in FIG. 10, an L-shaped radiator plate 33 is provided along two sides of the printed board 31, and the radiator plate 33 includes
7, 8, 12-15, 24, 25 are attached. Moreover, the semiconductor elements 7, 8, 24, 25 operating at a high frequency
And the semiconductor elements 12 to 15 operating at a low frequency are separately arranged on different surfaces. Thus, the influence of noise generated from the semiconductor elements 7, 8, 24, 25 operating at a high frequency on the semiconductor elements 12 to 15 operating at a low frequency is reduced.

FIG. 11 shows a structure of a heat radiating plate used for a printed circuit board of a high pressure discharge lamp lighting device according to a fifth embodiment of the present invention. At both ends of the heat sink 33, FIG.
As shown in (a), a foot 33a is formed to be inserted into a positioning hole (or notch) formed in the printed circuit board 31. As shown in FIG. 11B, the foot 33a is formed with a thinned portion cut from both sides, and can be easily cut at this portion.

The reason why the foot 33a is formed to be long including the tip to be cut is to make the operation of mounting the heat sink 33 to which the plurality of semiconductor components SC are mounted on the printed circuit board 31 as easy as possible. It is. That is, the feet 33 of the heat sink 33 are separated from the leads of the plurality of semiconductor elements SC.
By increasing the length of the printed circuit board 31
After the foot 33a of the heat sink 33 is inserted into the positioning hole, the lead of each semiconductor element SC may be inserted into each insertion hole, so that the insertion operation can be performed relatively easily. If the length of the foot portion 33a of the heat radiating plate 33 is shorter than the tip ends of the leads of the plurality of semiconductor elements SC, the leads of each semiconductor element SC are inserted into the respective insertion holes first, so that positioning is difficult, Insertion work becomes difficult.

After the heat sink 33 to which the plurality of semiconductor components SC are attached is inserted into the printed board 31, the protruding portions of the leads of each semiconductor element SC from the solder surface are cut to an appropriate length, and the printed board 31 is cut. Flowed into the solder bath. At this time, the projecting portion of the foot portion 33a of the heat radiating plate 33 from the solder surface also hinders the cutting, so that the cut portion is cut at both sides as described above.

FIG. 12 shows a structure of a heat sink according to a modification of the above embodiment. In this embodiment, the protruding portion of the foot portion 33a of the heat sink 33 from the solder surface is bent instead of being cut. By doing so, the heat sink 33
Is fixed to the printed circuit board 31, so that the semiconductor element SC
The effect of reducing the mechanical stress on the lead is also obtained.

FIG. 13 shows a circuit configuration of a high pressure discharge lamp lighting device according to a sixth embodiment of the present invention. The circuit configuration of this embodiment is different from the circuit configuration of the first embodiment shown in FIG. 7 in that the step-down chopper circuit 20 (see FIG. 2 for the internal circuit) and the polarity inversion circuit 21 are formed by a full bridge circuit. It is a point.

FIG. 14 is a timing chart showing the relationship between the on / off operation of the switching elements 35 to 38 and the lamp current in the circuit of FIG. Hereinafter, the operation of the circuit configuration of the present embodiment will be described with reference to this timing chart.

A pair of switching elements 35 and 38;
The pair of switching elements 36 and 37 alternately repeats high frequency switching as shown in FIG. Therefore, the operations of these switching elements correspond to the operations of the five switching elements 7, 12 to 15 in the circuit of FIG.

While the switching elements 35 and 38 are performing high-frequency switching, the switching element 35
When 38 and 38 are off, the stored energy of inductance 9 is returned to the power supply through diodes 40 and 41. While the switching elements 36 and 37 are performing high-frequency switching, the switching elements 36 and 37
Is turned off, the energy stored in the inductance 9 is fed back to the power supply through the diodes 39 and 42. That is, the function of the four diodes 39 to 42 corresponds to the function of the diode 8 in the circuit of FIG.

With the above operation, the rectangular wave AC power can be supplied to the high-pressure discharge lamp (lamp) 4, similarly to the circuit configuration of the first embodiment shown in FIG. Further, when a phenomenon of slow leak or half-wave discharge occurs in the high-pressure discharge lamp 4, a thermal protector detects a temperature rise of the pulse transformer 16 or the inductance 9 through which the lamp current flows,
Since the power supply to the DC power supply circuit 2 is cut off, the high-pressure discharge lamp 4 and the electronic ballast are protected.

In this embodiment, the switching element 3
As the elements 5 to 38, diodes 39 to 42 can be omitted by using elements with a built-in diode such as FETs. As a result, the required number of switching elements and diodes is increased from six in the first embodiment to four.
Can be reduced to one. As a result, it is advantageous in terms of cost and miniaturization.

FIG. 15 shows a circuit configuration of a high pressure discharge lamp lighting device according to a seventh embodiment of the present invention. The circuit configuration of this embodiment is different from that of the first embodiment shown in FIG. 7 in that the step-down chopper circuit 20 (see FIG. 2 for the internal circuit) and the polarity inversion circuit 21 are formed by a half-bridge circuit. It is a point.

FIG. 16 is a timing chart showing the relationship between the on / off operation of the switching elements 44 and 45 and the lamp current in the circuit of FIG. Hereinafter, the operation of the circuit configuration of the present embodiment will be described with reference to this timing chart.

The switching elements 44 and 45 are arranged as shown in FIG.
As shown in (1), high frequency switching is repeated alternately.
Therefore, the operation of these switching elements is shown in FIG.
5 switching elements 7, 12 to 15 in the circuit of FIG.
Operation.

While the switching element 45 is performing high-frequency switching, the energy stored in the inductance 9 when the switching element 45 is off is fed back to the capacitor 6 through the diode 46. In addition, while the switching element 44 is performing high-frequency switching, the energy stored in the inductance 9 when the switching element 44 is off is fed back to the capacitor 6 ′ through the diode 47. That is, the two diodes 46
And 47 correspond to the function of the diode 8 in the circuit of FIG.

With the above operation, as in the circuit configuration of the first embodiment shown in FIG. 7 and the circuit configuration of the sixth embodiment shown in FIG.
Can be supplied to Further, when a phenomenon of slow leak or half-wave discharge occurs in the high-pressure discharge lamp 4, the temperature rise of the pulse transformer 16 or the inductance 9 through which the lamp current flows is detected by the thermal protector, and the DC power supply circuit 2
Since the power supply to the electronic ballast is cut off, the high-pressure discharge lamp 4 and the electronic ballast are protected.

Also in this embodiment, the diodes 46 and 47 can be omitted by using elements with built-in diodes such as FETs as the switching elements 44 and 45. Thereby, the required number of switching elements and diodes can be reduced from six in the first embodiment to two. As a result, it is advantageous in terms of cost and miniaturization.

The high pressure discharge lamp lighting device according to the present invention has been described according to various embodiments. However, the present invention is not limited to the above embodiment, but can be implemented in various other forms.

[0057]

As described above, according to the high pressure discharge lamp lighting device of the present invention, protection which is activated when an abnormal phenomenon such as half-wave discharge or slow leak occurs in the high pressure discharge lamp at the end of its life. By providing the element, the electronic ballast and the high-pressure discharge lamp can be protected.

[Brief description of the drawings]

FIG. 1 is a block diagram of a conventional electronic ballast.

FIG. 2 is a diagram showing an example of a specific circuit of a conventional electronic ballast.

FIG. 3 is a time chart showing an on / off state of each switching element in the circuit of FIG. 2;

FIG. 4 is a time chart showing an operation of the igniter circuit in the circuit of FIG. 2;

FIG. 5 is a pseudo circuit often used to explain a half-wave discharge phenomenon, and is a series-parallel circuit of a resistor and a diode.

FIG. 6 is a table comparing electric characteristics when a 70 W metal halide lamp is turned on by an electronic ballast.

FIG. 7 is a diagram showing a circuit configuration of the high pressure discharge lamp lighting device according to the first embodiment of the present invention.

FIG. 8 is a diagram showing an example of the structure of a high pressure discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 9 is a diagram illustrating an example of a printed circuit board used for a high pressure discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 10 is a diagram showing an example of the arrangement of circuit components on a printed circuit board used in a high-pressure discharge lamp lighting device according to a fourth embodiment of the present invention.

FIG. 11 is a view showing a structure of a heat sink used for a printed circuit board of a high pressure discharge lamp lighting device according to a fifth embodiment of the present invention.

FIG. 12 is a view illustrating a structure of a heat sink according to a modification of the fifth embodiment.

FIG. 13 is a diagram showing a circuit configuration of a high pressure discharge lamp lighting device according to a sixth embodiment of the present invention.

14 is a timing chart showing the relationship between the on / off operation of each switching element and the lamp current in the circuit of FIG.

FIG. 15 is a diagram showing a circuit configuration of a high pressure discharge lamp lighting device according to a seventh embodiment of the present invention.

16 is a timing chart showing the relationship between the on / off operation of each switching element and the lamp current in the circuit of FIG.

[Explanation of symbols]

 2 DC power supply circuit 4 High-pressure discharge lamp (lamp) 16 High-voltage pulse transformer 20 Step-down chopper circuit 21 Polarity inverting circuit 29 Protective element (thermal protector) 30 Case 31 Printed circuit board 32 Compound 33 Heat sink 33a Foot AP Electronic component mounting part DP transport Dummy part SC semiconductor element

Continuation of front page (72) Inventor Jun Kumagai 1048 Kazuma Kadoma, Osaka Prefecture F-term in Matsushita Electric Works, Ltd. (reference) 3K072 AA11 AA13 BA05 EA01 EB04 GB18 GC04 3K083 AA24 BA25 BA26 BC47 BE22 BE40 CA33

Claims (11)

[Claims] 1. A high-pressure discharge lamp lighting device comprising: a power supply; an electronic ballast including an electronic component including at least one protection element; and a printed board; and a high-pressure discharge lamp. A high pressure discharge lamp lighting device, which is disposed at a location where abnormal phenomena of the high pressure discharge lamp such as discharge and slow leak can be detected. 2. The high pressure discharge lamp lighting device according to claim 1, wherein the protection element is a thermal protector attached to a component connected in series to the high pressure discharge lamp. 3. The high pressure discharge lamp lighting device according to claim 2, wherein said electronic component includes a high voltage pulse transformer for generating a high voltage pulse voltage for starting said high pressure discharge lamp. 4. The high pressure discharge lamp lighting device according to claim 3, wherein the high voltage pulse transformer is connected in series to the high pressure discharge lamp, and the thermal protector is attached to the high voltage pulse transformer. 5. A board block in which the electronic component is mounted on the printed circuit board is housed in a case, and when the compound is filled to improve moisture resistance, the thermal protector is located at a position where the compound is not embedded in the compound. The high pressure discharge lamp lighting device according to claim 4, wherein the lighting device is attached. 6. The printed circuit board includes an electronic component mounting portion and transfer dummy portions formed on both sides thereof, and the transfer dummy portion is used for fixing the printed circuit board to the case. The high pressure discharge lamp lighting device according to claim 5, wherein 7. The electronic component includes a plurality of semiconductor elements attached to a radiator plate, the radiator plate has two planes connected in an L-shaped cross section, and the plurality of semiconductor elements are arranged on one plane. 7. The high pressure discharge lamp lighting device according to claim 4, wherein a semiconductor element operable at a high frequency is mounted, and a semiconductor element operable at a low frequency is mounted on the other plane. 8. The electronic component includes a plurality of semiconductor elements mounted on a radiator plate, and the radiator plate has a plurality of feet inserted into a plurality of positioning holes formed in the printed circuit board. The projecting length of the foot portion is formed longer than the projecting length of the leads of the plurality of semiconductor elements attached to the heat sink, and the heat sink to which the plurality of semiconductor elements are attached is positioned on the printed circuit board. After insertion, so that the tip of the foot can be cut off,
8. The high pressure discharge lamp lighting device according to claim 4, wherein notches are formed on both sides of the foot portion. 9. The electronic component includes a plurality of semiconductor elements attached to a radiator plate, and the radiator plate has a plurality of feet inserted into a plurality of positioning holes formed in the printed circuit board. The projecting length of the foot portion is formed longer than the projecting length of the leads of the plurality of semiconductor elements attached to the heat sink, and the heat sink to which the plurality of semiconductor elements are attached is positioned on the printed circuit board. 8. The high pressure discharge lamp lighting according to claim 4, wherein a notch is formed on one surface of the foot so that the tip of the foot can be bent after the insertion. apparatus. 10. The electronic ballast includes a DC power supply circuit including a rectifier circuit, a step-down chopper circuit connected to an output side of the DC power supply circuit, and a polarity inversion circuit connected to an output side of the step-down chopper circuit. The step-down chopper circuit includes at least one switching element, a diode, an inductance, and a capacitor, and the polarity inversion circuit converts a current supplied to a high-pressure discharge lamp connected as a load to an output side into an AC current. The high pressure discharge lamp lighting device according to any one of claims 4 to 9, wherein conversion is performed. 11. The polarity reversing circuit includes two sets of switching paths connected in parallel to an output side of the step-down chopper circuit. Each switching path includes two switching elements connected in series, and one of the switching paths is connected to the other. The high pressure discharge lamp lighting device according to claim 10, wherein the high pressure discharge lamp is connected between a midpoint of the path and a midpoint of the other switching path.