JPH03171595A - Lighting apparatus for discharge lamp - Google Patents

Abstract

PURPOSE:To obtain a lighting apparatus for a discharge lamp with lightweight and small size and high power efficiency by connecting a plurality of peak proceeding phase ballasts in the output side of an inverter and connecting a discharge lamp with each of peak proceeding phase ballasts. CONSTITUTION:Electric power from an electric power source 112 with a commercial frequency is converted into high frequency current by a voltage-type inverter 114. Voltage having high frequency is put out of the inverter 114 and supplied to peak proceeding phase ballasts 130a, 130b, 130c. Voltage hightened in each ballast 130 is applied to capacitors 132a, 132b, 132c, and discharge lamps 118a, 118b, 118c and current limited by the capacitor 132 runs and each discharge lamp 118 is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a discharge lamp lighting device, and more particularly to an improvement of a discharge lamp lighting device using a voltage type inverter.

[Prior Art] Generally, in order to light a discharge lamp, a discharge lamp lighting device including a ballast is required.

Traditionally, steel-type ballasts have been used as ballasts for such discharge lamp lighting devices, but they have the disadvantage of being large and heavy.In order to make the ballasts smaller and lighter, high-frequency inverter-type ballasts have been used. has been used.

However, the cost of inverter-type ballasts is higher than that of steel-type ballasts, which has hindered their widespread use.

For this reason, for example, a discharge lamp lighting device as shown in FIG. 3(A) can be considered.

The discharge lamp lighting device 10 shown in the figure includes a voltage type inverter 14 to which a driving current is supplied from a commercial power supply l2, and high frequency choke coils 16a and 16b connected in parallel to the output side of the voltage type inverter 14. Each choke coil 16
discharge lamps 18a and 18b connected in series to a and 16b;
including.

These choke coils 16a, 16b are smaller, lighter, and less expensive than those for commercial frequencies, and since they share an expensive inverter, the entire device can be made smaller, lighter, and less expensive. .

However, in such a discharge lamp lighting device 10, the power factor of the choke portion is poor and the number of connectable discharge lamps is small, so that the cost cannot be reduced sufficiently.

In addition, the inverter 14 and each choke coil 16a 1
Since the distance between the wires 6b is often long and the power factor is low, the wire between the wires must be made thicker, resulting in an increase in construction costs.

For this reason, an improved discharge lamp lighting device 10 as shown in FIG. 3(B) is also considered.

The discharge lamp lighting device 10 shown in the figure includes a choke coil 16
Power factor correction capacitor 20a in parallel with a, 16b, 16c
, 20b, 20c are arranged.

According to such a family electric lamp lighting device, the power factor itself can be improved compared to the device shown in FIG. 3(A).

[Problems to be Solved by the Invention] However, in the discharge lamp lighting device provided with the power factor correction capacitors 20a, 20b, and 20c as shown in FIG. There was a problem that the water could flow and destroy the ballast.

The present invention has been made in view of the problems of the prior art described above, and its object is to provide a compact and lightweight discharge lamp lighting device with a high power factor.

[Means for Solving the Problems] In order to achieve the above object, a discharge lamp lighting device according to the present invention includes an inverter and a plurality of ballasts, and the ballasts are connected to the output side of the inverter. It is characterized by consisting of a plurality of peak phase advance type ballasts.

[Function] Since the discharge lamp lighting device according to the present invention has the above-described means, the ballast may be small and lightweight since it is driven by a high frequency current.

Furthermore, since the ballast is a peak-advanced ballast, the excitation current of the secondary core of the transformer is used to achieve a high power factor, and there is no inrush current and a high power factor can be achieved.

Therefore, since the discharge lamp lighting device according to the present invention uses a ballast with a high power factor, it is possible to connect a large number of ballasts, which is economical, and also because of the high peak current supplied from the voltage type inverter. It is possible to reliably prevent the device itself from being destroyed.

[Example] Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a discharge lamp lighting device according to an embodiment of the present invention, and parts corresponding to those in FIG. 3 are denoted by 100.
will be added and the explanation will be omitted.

A characteristic feature of the present invention is that a plurality of peak phase advance type ballasts are connected to the output side of the inverter, and a discharge lamp is connected to each ballast.

For this reason, in this embodiment, peak phase advance type ballasts 130a, 130b, 13 are provided on the output side of the voltage type inverter 114.
0c are connected in parallel.

The discharge lamp lighting device 110 according to this embodiment is roughly configured as described above, and its operation will be explained next.

First, power from a commercial frequency power source 112 is converted into a high frequency current by a voltage type inverter 114. In addition,
Since this inverter 114 is of a voltage type, its output impedance is low and a plurality of loads can be connected in parallel.

Then, a high-frequency voltage is output from the inverter 114 and supplied to each of the stabilizers 130a, 130b, and 130c.

The voltage further boosted inside each ballast 130 is applied to capacitors 132a, 132b, 132c and discharge lamp 118a.
, 118b, 118c, and a current limited by the capacitor 132 flows to light each discharge lamp 118.

In addition, since each ballast 130 is driven by a high frequency voltage at this time, it is possible to use a small and lightweight one.

In addition, the ballast 130 is a phase advance type that limits the current with a capacitor 132, but it uses the excitation current of the secondary core of the step-up transformer to achieve a high power factor, so there is no inrush current and a high power factor. It has become.

FIG. 2 shows the core of the peak phase advance type ballast used in this embodiment.

The core 140 shown in the figure includes a primary core 142 around which a primary coil is wound, and a secondary core 144 around which a secondary coil is wound.
and, including.

Further, leaks (shunts) 146a and 146b are provided on both sides of the connecting position of each core 142 and 144, and the magnetic coupling between the primary side and the secondary side is made rough and an inductance component is generated.

In addition, a slot 148 is formed approximately in the middle of the secondary core 144 to reduce core loss while ensuring a high peak voltage for starting the discharge lamp, and to reduce core loss at high frequencies where core loss accounts for a large proportion. It has important significance in the field.

[Effects of the Invention] As explained above, according to the discharge lamp lighting device according to the present invention, a plurality of lead peak type ballasts are connected to the output side of the inverter, and the discharge lamp is lit by each ballast. Therefore, there is no inrush current from the inverter and the power factor is high. As a result, it is possible to connect a large number of ballasts and lamps to the output side of the inverter, and it is possible to reduce costs and make the ballast smaller and lighter.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a discharge lamp lighting device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the core of a ballast used in the device shown in Fig. 1, and Fig. 3 is a diagram of a conventional discharge lamp lighting device. FIG. 2 is an explanatory diagram of a circuit configuration of a lamp lighting device. 10 110...Discharge lamp lighting device 12, 112...Commercial power source 14,114...Voltage type inverter 18, 118...Discharge lamp 130...Peak advance phase ballast

Claims (1)

[Claims] (1) An inverter that converts a power supply voltage to a higher frequency, and a plurality of peak phase advance type ballasts connected to the output side of the inverter, and a discharge lamp is connected to each of the peak phase advance type ballasts. A discharge lamp lighting device characterized by: