JPS58198898A - Device for firing discharge lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a discharge lamp lighting device for lighting a discharge lamp at high frequency.

[Technical background of the invention and its drawbacks]

It has been conventionally known that when lighting a discharge lamp, the luminous efficiency of the lamp is higher for the same lamp input when it is lit at high frequency AC than at commercial AC frequency. When lighting a lamp using such high-frequency alternating current, the circuit configuration generally has the configuration shown in FIG. That is, a smoothing capacitor 2 is connected to a rectifier circuit 1 connected to a commercial power source, and a high frequency transistor inverter 3 is further connected. A discharge lamp, for example, a fluorescent lamp 4 is connected to this high frequency transistor inverter 3.

When the discharge lamp is a fluorescent lamp as shown in FIG. 1, a preheating starting circuit 5 is connected in parallel with the fluorescent lamp 4. still,
6 is a stabilizer.

This high frequency transistor inverter 3 has the following configuration. That is, a parallel circuit of a single oscillation transformer 7 and an oscillation capacitor 8, and a switching transistor 9 whose collector terminal is connected in series to this parallel circuit are connected in parallel to the smoothing capacitor 2. However, a feedback winding 10 is inserted between the emitter terminal of the switching transistor 9 and the negative terminal of the smoothing capacitor 2. The base terminal of the switching transistor 9 is connected to the positive terminal of the smoothing capacitor 2 via an inductance 11 and a starting resistor 12. Furthermore, a diode 13 and a resistor 14 are connected between the connection point of the inductance 11 and the starting resistor 12 and the negative terminal of the smoothing capacitor 2 as part of a transistor drive circuit including the feedback winding 10.
and a capacitor 15 connected in parallel to this series circuit.

The operation of the discharge lamp lighting device having the above configuration will be explained. The alternating voltage is converted into a pulsating voltage through a full-wave rectifier circuit 1, and this pulsating voltage is further smoothed by a smoothing capacitor 2 and applied to a high frequency transistor inverter A. When a voltage is applied to the high frequency transistor inverter 3.

A current flows through the starting resistor 12 and the inductance 11 to the transistor 9, and the transistor 9 is turned on. Thereafter, the transistor 9 is repeatedly turned on and off, and the oscillation transformer 7 is
and oscillation capacitor 8 connect the oscillation. The oscillation energy at this time is supplied to the fluorescent lamp 4 and the starting circuit 5 via the ballast 6, and the fluorescent lamp 4 is started and lit by the action of the starting circuit 5.

A discharge lamp lighting device has such a circuit configuration.

Since the smoothing capacitor 2 is connected between the rectifier circuit 1 and the high frequency inverter, the power factor of the nine circuits is poor. Furthermore, it is vulnerable to surges such as lightning surges, and has the disadvantage that the transistor 9 is damaged.

Moreover, instead of the ballast used in the recently developed self-ballasted fluorescent lamp device, the circuit shown in Figure 1 is used.
If an attempt is made to reduce the weight of the bulb-type fluorescent lamp device with metal fittings, it has the disadvantage that not only the transistor may be damaged, but also ignition or smoke may occur.

This is a bulb-shaped fluorescent lamp device with a metal fitting, in which a fluorescent lamp shaped approximately in the shape of a saddle is mounted in a translucent envelope together with a choke-shaped ballast or the circuit shown in Figure 1. (Tata) with a screw-type cap attached to it. In other words, due to this structure, the inside of the envelope becomes high temperature due to the heat generation effect of the lamp while the lamp is on, and if a lightning surge etc. is applied to the circuit in this state, the transistor can easily be damaged or instantaneous damage may occur. There is a danger that overcurrent will flow and circuit components including transistors will catch fire or emit smoke. The cause of such ignition and smoke is often due to damage to the transistor.

[Purpose of the invention]

An object of the present invention is to provide a discharge lamp lighting device that improves the circuit power factor and further has a transistor protection function against surges.

[Summary of the invention]

The present invention relates to a full-wave rectifier circuit connected to an AC power source.

A smoothing capacitor for smoothing this rectified pulsating output, a high frequency transistor inverter connected to the output terminal of this smoothing capacitor, and a discharge lamp including a discharge lamp, such as a fluorescent lamp, energized by this high frequency transistor inverter. In the device, one-circuit power factor is improved by inserting a resistive element between the connection point between the positive input terminal of the high-frequency transistor inverter and the positive terminal of the smoothing capacitor, and the positive output terminal of the full-wave rectifier circuit. death,
It is characterized by protecting the transistor against surges.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 shows a bulb-shaped fluorescent lamp device equipped with a discharge lamp lighting device of the present invention. In this fluorescent lamp device, a fluorescent lamp 4 and a lighting device 17 are mounted in a transparent envelope 16. A screw cap 18 is attached to the envelope 16 and is electrically connected to the fluorescent lamp 4 and the lighting device 17 inside. The fluorescent lamp 4 has a substantially saddle shape in which a straight pulp tube is bent into a U-shape to form a central bent part, and both ends and the central bent part are bent again into a U-shape. I am doing it.

FIG. 3 shows the circuit configuration of the lighting device 17 together with the fluorescent lamp 4. Here, the detailed explanation of the parts similar to the conventional example shown in FIG. 1 will be omitted.

The difference between this embodiment and the conventional example is that a resistor element 19 is inserted between the positive output terminal of the full-wave rectifier circuit 1, the positive output terminal of the smoothing capacitor 2, and the connection point with the high-frequency transistor inverter. It is that you are. Further, since the basic operation of the circuit is exactly the same as that of the conventional example, the explanation will be omitted.

Here, the load output power of the fluorescent lamp 4 is 8W.

The resistance to surge was measured for the 14W and 20W circuits by changing the resistance value of the resistance element 19. Regarding surges, we applied the pulse voltage specified for lighting equipment under the Electrical Appliances and Materials Control Law to the input terminal of the power supply to check for damage to the circuit.

The pulse to be applied is a positive polarity standard impulse voltage waveform -1-
(1×40) μs, and the peak voltage was 6 KV. Each measurement was repeated, and those with no damage after 10 repetitions were evaluated as 0. Those with one damage after 10 repetitions were evaluated as Δ, and those with damage twice were evaluated as ×. The results are shown in Table 1.

Regarding the surge in Table 1, the resistance value of resistor element 19 is 1
It turns out that it is sufficient if it is Ω or more.

On the other hand, the input power factor was measured by changing the resistance value of the resistance element 19. The load output power of the fluorescent lamp is 8W and 14W, respectively, when the resistive element 19 is not inserted.

A power source of 20W was used. The results are shown in FIG. From this result, it can be seen that inserting a resistive element increases the input power factor, and the higher the resistance value, the higher the input power factor.

However, on the other hand, by inserting a resistive element, resistance loss increases and the efficiency of one circuit tends to deteriorate. The load output power of the fluorescent lamp is 8W and 14W.

The resistance loss coefficient (resistance loss/input power) was measured for each of 20 W, and the results are shown in FIG. It is practically undesirable if the resistance loss coefficient exceeds 10 inches. Therefore, the resistance loss coefficient is suppressed to about 10% or less, and the resistance value range of the resistance element 19 is about 50 [Ω] and 29 [Ω], respectively.
It is preferable to set the value to 1, 20 (ff or less).Generally, the resistance value R [Ω] of the resistor element 19 is in the range of 8W to 20W with respect to the lamp load output power P (W)K. when.

00 R≦1 [Ω] You can set it within the range.

As mentioned above, a resistor with a resistance value of 1 [Ω] or more is inserted between the positive output terminal of the full-wave rectifier circuit 1 and the smoothing capacitor 20, so the circuit is protected against surges.

Mainly, the protection of the transistor 9 can be ensured. Moreover, when the lighting device 17 is installed in the envelope 16 together with the fluorescent lamp 4 as in this embodiment, the inside of the envelope 16 is at a high temperature even when the fluorescent lamp 4 is lit normally. Therefore, when a surge is applied there, if the resistor element 19 is not inserted, there is a risk that the circuit will be damaged or a fire will occur, but by inserting the resistor element 19, damage to the circuit, especially the transistor, can be prevented. Therefore, it is possible to prevent ignition, etc.

Further, by inserting the resistive element 19, the input power factor can be improved.

Although the above example uses a fluorescent lamp, it is not limited to this, and even when a general discharge lamp is used, the circuit protection input power factor against surges can be improved, and the resistance value also changes depending on the load output of the lamp. You can choose appropriately. Moreover, the same effect can be expected even if the fluorescent lamp and lighting device are not integrated.

〔Effect of the invention〕

As explained above, in the present invention, a resistance element is inserted between the positive output of the full-wave rectifier circuit and the smoothing capacitor, so that circuit protection against surges is achieved and reliability is improved.
Moreover, an improvement in input power factor can be achieved.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of a conventional discharge lamp lighting device, FIG. 2 is a configuration diagram of a nine bulb type fluorescent lamp device equipped with a discharge lamp lighting device of the present invention, and FIG. 3 is a diagram of a fluorescent lamp device according to the present invention. FIG. 4 is a circuit configuration diagram showing an example of the above. FIG. 5 shows a circuit characteristic diagram of the embodiment. 1...Full-wave rectifier circuit, 2...Smoothing, capacitor, 3...High frequency transistor inverter, 4...Discharge lamp (fluorescent lamp), 19...Resistance element. αυ Figure 1 Figure 2 Procedural amendment (voluntary) 1. Display of the case 2, Name of the invention Discharge lamp lighting device 3, Person making the amendment Relationship to the case Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4, Agent 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100 Tokyo Shibaura Electric Co., Ltd. Tokyo Office Specifications and Drawings Pulse voltage waveform + (I X40 ) μS, and peak voltage was 6 kV. " is corrected to "The standard impulse voltage waveform (IX40) μS with a peak voltage of 6 kV is repeated for 10 cycles alternately in positive and negative directions." (2) Two corrections have been made to Figures 4 and 5 in the attached sheet. Jurisdiction L □ Conspiracy Zheng Bing 隨 RR Book procedural amendment (spontaneous) 1. Indication of the case Patent Application No. 57-81634 2. Name of the invention Discharge lamp lighting device 3. Person making the amendment Relationship with the case Patent application Person (307) Tokyo Shibaura Electric Co., Ltd. 4, Agent Address: 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100 Tokyo Shibaura Electric Co., Ltd. Tokyo Office (7317) Patent Attorney Kensuke Norichika 5, Full text of the specification subject to amendment 6. Contents of the amendment Correction specification 1 Name of the invention Discharge lamp lighting device 2 Scope of claims (1) A full-wave rectifier circuit connected to an AC power supply and smoothing of the pulsating output of this full-wave rectifier circuit In a discharge lamp lighting device that includes a smoothing capacitor, a high-frequency transistor inverter driven by the smoothed output, and a discharge lamp energized by the high-frequency transistor inverter, the positive input terminal of the high-frequency transistor inverter and the smoothing capacitor are connected to each other. A discharge lamp lighting device characterized in that a resistive element is inserted between a connection point with a positive terminal and a positive output terminal of a full-wave rectifier circuit. (2) The load output power of the discharge lamp is s (w) <: p (w)
≦20[:W], the resistive element inserted between the connection point between the positive input terminal of the high-frequency transistor inverter and the positive terminal of the smoothing capacitor, and the positive output terminal of the full-wave rectifier circuit. Resistance value R [Ω] is 1 R≦ 4
00. The discharge lamp lighting device according to claim (1), characterized in that: 3. Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a discharge lamp lighting device for lighting a discharge lamp at high frequency. [Technical Background of the Invention and Its Disadvantages] When lighting a discharge lamp, it has been conventionally known that the luminous efficiency of the lamp is higher for the same lamp input when it is lit at a high frequency AC than when it is lit at a commercial AC frequency. Well known. When lighting a lamp using such high-frequency alternating current, the circuit configuration generally has the configuration shown in FIG. In other words, smoothing is applied to the rectifier circuit H' connected to the commercial power supply? - Idenser 2 is connected, and a high frequency transistor inductor is further connected. A discharge lamp, for example, a fluorescent lamp 4 is connected to this high frequency transistor inverter. When the discharge lamp is a fluorescent lamp as shown in FIG. 1, a preheating starting circuit 5 is connected in parallel with the fluorescent lamp 4. In addition, 6 is a stabilizer. This high frequency transistor inverter 3 has the following configuration. In other words, a parallel circuit of nine oscillating transformers 7 and oscillating capacitors 8, and a switching transistor 9 whose collector terminal is connected in series to this parallel circuit form a smoothing capacitor/
2 in parallel. However, a feedback winding 10 is inserted between the emitter terminal of the switching transistor 9 and the negative terminal of the smoothing capacitor 2. The base terminal of the switching transistor 9 is connected to the positive terminal of the smoothing capacitor 2 via an inductance 1 and a starting resistor 12. Furthermore, a diode 13 and a resistor 14 are connected between the connection point of the inductance 11 and the starting resistor 12 and the negative terminal of the smoothing capacitor 2 as part of a transistor drive circuit including the feedback winding 10.
and a capacitor 15 connected in parallel to this series circuit. The operation of the discharge lamp lighting device having the above configuration will be explained. The alternating voltage is converted into a pulsating voltage through a full-wave rectifier circuit 1, and this pulsating voltage is further smoothed by a smoothing capacitor 2 and applied to a high frequency transistor inverter. Once the voltage is applied to the high frequency transistor inverter. A current flows to the base of the transistor 9 via the starting resistor 12 and the inductance 11, and the transistor 9 is turned on. Thereafter, the transistor 9 is repeatedly turned on and off, and the oscillation transformer 7 is turned on and off in accordance with the on and off of the transistor 9.
And the oscillation capacitor 8 continues the Zhu Ning vibration. The oscillation energy at this time is supplied to the fluorescent lamp 4 and the starting circuit through the power transformer 6, and the fluorescent lamp 4 is started and lit by the action of the starting circuit. A discharge lamp lighting device has such a circuit configuration. Since the smoothing capacitor 2 is connected between the rectifier circuit 1 and the high frequency inverter, the power factor of the nine circuits is poor. Furthermore, it is vulnerable to surges such as lightning surges, and has the disadvantage that the transistor 9 is damaged. Moreover, the circuit shown in Figure 1 is used for the ballast used in the recently developed bulb-type fluorescent lamp device with metal fittings.
If an attempt is made to reduce the weight of the bulb-type fluorescent lamp device with metal fittings, it has the disadvantage that not only the transistor may be damaged, but also ignition or smoke may occur. This is a bulb-shaped fluorescent lamp device with a metal fitting, in which a fluorescent lamp shaped approximately in the shape of a saddle is mounted in a translucent envelope together with a choke-shaped ballast or the circuit shown in Figure 1. This is because it has a screw-type cap attached to it. In other words, due to this structure, the inside of the envelope becomes high temperature due to the heat generation effect of the lamp while the lamp is on, and if a lightning surge etc. is applied to the circuit in this state, the transistor can easily be damaged or instantaneous damage may occur. There is a danger that overcurrent will flow and circuit components including transistors will catch fire or emit smoke. The cause of such ignition and smoke is often due to damage to the transistor. [Object of the Invention] An object of the present invention is to provide a discharge lamp lighting device which improves the circuit power factor and has a transistor protection function against surges. [Summary of the Invention] The present invention provides a full-wave rectifier circuit connected to an AC power source. A smoothing capacitor that smoothes this rectified pulsating output, a high frequency transistor inverter connected to the output terminal of this smoothing capacitor, and a discharge lamp including a non-discharge lamp such as a fluorescent lamp energized by this high frequency transistor inverter. In the device, two-circuit power factor can be reduced by inserting a resistive element between the connection point between the positive input terminal of the high-frequency transistor inverter and the positive terminal of the smoothing capacitor, and the positive output terminal of the full-wave rectifier circuit. improve the
It is characterized by protecting the transistor against surges. [Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 shows a bulb-shaped fluorescent lamp device equipped with a discharge lamp lighting device of the present invention. In this fluorescent lamp device, a fluorescent lamp 4 and a lighting device 17 are mounted in a transparent envelope 16. A screw cap 18 is attached to the envelope 16 and is electrically connected to the fluorescent lamp 4 and the lighting device 17 inside. The fluorescent lamp 4 has a central curved portion formed by bending a single straight tube bulb into a U-shape, and then both ends and the central curved portion are bent again into a U-shape to form a substantially saddle structure. It has a shape. FIG. 3 shows the circuit configuration of the lighting device 170 together with the fluorescent lamp 4. Here, the detailed explanation of the parts similar to the conventional example shown in FIG. 1 will be omitted. The difference between this embodiment and the conventional example is that a resistive element 19 is inserted between the positive output terminal of the full-wave rectifier circuit 1, the positive output terminal of the smoothing capacitor 2, and the connection point between the high-frequency transistor inverter and the high-frequency transistor inverter. It is that you are. Further, since the basic operation of the circuit is exactly the same as that of the conventional example, the explanation will be omitted. Here, the load output power of the fluorescent lamp 4 is 8W. The resistance to surge was measured for the 14W and 20W circuits by changing the resistance value of the resistance element 19. Regarding surges, we applied the pulse voltage specified for lighting equipment under the Electrical Appliances and Materials Control Law to the input terminal of the power supply to check for damage to the circuit. The pulse to be applied is a positive polarity standard impulse voltage waveform + (IX40) μS with a peak voltage of 6 kV, which is repeated for 10 cycles in positive and negative directions alternately. Each measurement was repeated, and those with no damage after 10 repetitions were evaluated as Δ, those with one damage after 0.10 repetitions were evaluated as Δ, and those with two damages were evaluated as ×. The results are shown in Table 1. Table 1 From this table, regarding surge, the resistance value of resistor element 19 is 1
It turns out that it is sufficient if it is Ω or more. On the other hand, the input power factor was measured by changing the resistance value of the resistance element 19. The load output power of the fluorescent lamp is 8W and 14W, respectively, when the resistive element 19 is not inserted. A power source of 20W was used. The results are shown in FIG. From this result, it can be seen that inserting a resistive element increases the input power factor, and the higher the resistance value, the higher the input power factor. However, if a resistive element is inserted, resistance loss increases and circuit efficiency tends to deteriorate. The load output power of the fluorescent lamp is s w , 14 W. The resistance loss coefficient (resistance loss/input power) was measured for each of 20 W, and the results are shown in FIG. It is practically undesirable if the resistance loss coefficient exceeds 10%. Therefore, it was decided to suppress the resistance loss coefficient to about 10% or less, and the resistance value range of the resistance element 19 was about 60 [Ω] and 29 (Ω), respectively.
), i”o (Ω) or less.Generally, for the load output power p (w) of the lamp, the resistance value R [Ω] of the resistor element 19 is set when the load output power of the lamp is from 8W to 20W. If it is within the range, R≦stop [Ω].As described above, connect a resistor with a resistance value of l [Ω] or more between the positive output terminal of the full-wave rectifier circuit 1 and the smoothing capacitor 20. Since it is inserted, the circuit is protected against surges.Mainly, the transistor 9 can be reliably protected.Furthermore, when the lighting device 17 is installed in the envelope 16 together with the fluorescent lamp 4 as in this embodiment, the outer envelope The inside of the device 16 is at a high temperature even when the fluorescent lamp 4 is lit normally, so when a surge is applied there, the circuit may be damaged or a fire may occur if the resistive element 19 is not inserted. However, by inserting the resistor element 19, it is possible to prevent the 9 circuits, especially the transistors, from being connected, which in turn can prevent fires, etc. Furthermore, the insertion of the resistor element 19 can reduce the input power factor. Although the above example uses a fluorescent lamp, it is not limited to this, and even when a general discharge lamp is used, the circuit protection input power factor against surges can be improved, and the resistance value is also the same as that of the lamp. It can be selected appropriately depending on the load output.Furthermore, the fluorescent lamp and the lighting device may be used as an integrated set.In this case, when the fluorescent lamp starts, the incandescent lamp is also in the early stage of lighting, and its resistance value is low, so high frequency Sufficient current and power are given to the transistor inverter and the fluorescent lamp, and the fluorescent lamp starts easily.After the fluorescent lamp starts, the incandescent lamp lights up and its resistance changes to a steady state, which improves the power factor and prevents surges. [Effects of the Invention] As explained above, in the present invention, a resistance element is inserted between the positive output of the full-wave rectifier circuit and the smoothing capacitor, so that the circuit can be protected against surges. Protection is achieved, reliability is improved,
Moreover, an improvement in input power factor can be achieved. 4. Brief description of the drawings Figure 1 is a circuit diagram of a conventional discharge lamp lighting device, and Figure 2 is a diagram of a bulb-shaped fluorescent lamp device with metal fittings equipped with the discharge lamp lighting device of the present invention. , FIG. 3 is a circuit configuration diagram showing an embodiment of the present invention, and FIG. 4 is a circuit diagram showing an embodiment of the present invention. FIG. 5 shows a circuit characteristic diagram of the embodiment. 1...Full wave rectifier circuit, 2...Smoothing capacitor. dan...high frequency transistor inverter, 4...discharge lamp (fluorescent lamp), 19...resistance element. Agent Patent Attorney Noriyuki Chika

Claims (2)

[Claims] (1) A full-wave rectifier circuit connected to an AC power source, a smoothing capacitor that smoothes the pulsating output of the full-wave rectifier circuit, a high-frequency transistor inverter driven by this smoothed output, and a high-frequency transistor inverter that is driven by the smoothed output. In a discharge lamp lighting device equipped with a discharge lamp to be energized, a resistor is connected between the connection point between the positive input terminal of the high-frequency transistor inverter and the positive terminal of the smoothing capacitor and the positive output terminal of the full-wave rectifier circuit. A discharge lamp lighting device characterized in that an element is inserted. (2) The load output power of the discharge lamp is set to 8[Wl≦P(Wl≦2
011J, the resistance value R [Ω ] is 00 1≦R≦−d−. The discharge lamp lighting device according to claim 1, wherein: