JP3483495B2 - Ballast for discharge lamp - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballast for various discharge lamps such as a discharge mercury lamp, a sodium lamp and a fluorescent lamp. 2. Description of the Related Art In recent years, discharge mercury lamps have been used on highways and factories, and sodium lamps have been used in fluorescent lamps (hereinafter, referred to as tunnels).
These are referred to as "discharge lamps") for homes, offices, factories,
It is widely used in hospitals and many other places . [0003] However, the discharge lamp is
Since the phenomenon is used, the current is shown in FIG.
As much as the distorted harmonic peak current (harmonic noise
Flow) A is included. In addition, it is generated by the discharge arc of the discharge lamp.
Generated high-frequency noise (hereinafter referred to as
Stop it and call it “obstacle wave”). Since such a disturbance wave flows into the power supply circuit from the discharge lamp, noise or radio interference occurs in various devices using the power supply circuit as a common power supply, for example, a hospital MIR diagnostic device, a life support electronic device, a computer, and the like. These devices may malfunction, causing problems for the information equipment industry, and the solution is poor. In particular,
In the case of life-sustaining electronic devices, a malfunction can result in a major accident involving human life. In addition, electromagnetic waves generated from the discharge lamp also have an adverse effect on other devices. The rate of fluctuation (allowable fluctuation standard) of a generally supplied power supply voltage was 100 V ± 3 V in the past, but recently the permissible width has increased to 101 V ± 6 V. For this reason, the variation of the current flowing through the discharge lamp increases with this variation, and the brightness of the discharge lamp (Lx: looks)
Fluctuation range becomes large (unstable), power consumption increases, overcurrent flows to the discharge lamp, shortening the life (usable time) of the discharge lamp, and the discharge lamp overheating There was also a danger that a flammable material near the building, such as a curtain, could burn out and cause a fire. [0005] [Means for Solving the Problems An object of the present invention, the harmonic
And obstacle waves from flowing into the power circuit of the discharge lamp,
An object of the present invention is to prevent noise and radio interference from occurring in the various devices connected to the same power distribution circuit as the power supply circuit. Further, the power consumption of the discharge lamp can be reduced, the desired brightness (luminous intensity) can be obtained with a small amount of power, and the fluctuation of the input current and the luminous intensity accompanying the fluctuation of the input power supply voltage (fluctuation within the standard) can be reduced. (Good stability), the input current does not fluctuate much, so overcurrent does not flow through the discharge lamp, preventing damage to the discharge lamp due to overcurrent, shortening the life of the discharge lamp, and preventing fire from occurring due to overheating. To be able to do it. A ballast for a discharge lamp according to the present invention comprises: an iron core;
Primary winding with terminals and intermediate terminals, and multiple secondary windings
And a secondary winding connected to the intermediate terminal and one end of the discharge lamp.
And a capacitor connected between the
Between the secondary windings connected to the other end of the source terminal and the discharge lamp
By providing a connected choke coil,
Source-choke coil-discharge lamp-capacitor-intermediate terminal-
A series resonance circuit consisting of a winding and a power source that is part of the primary winding
Can be formed, and the formed series resonance circuit
Impedance whose impedance value resonates with the third harmonic
Of the capacitor and choke coil so that
Set the actance, and connect one end of the discharge lamp to the power supply.
The winding connected between the other end of the discharge lamp and the power supply
And the choke coil connected between the
Waves and obstacle waves from the power supply.
You. (Embodiment 1) An embodiment of a ballast for a discharge lamp according to the present invention will be described with reference to FIG. The ballast 30 for a discharge lamp of the present invention shown in FIG.
Are the power terminals 27, 28, 29 and the intermediate terminals
20, a plurality of secondary windings 33a, 3
3b, 33c and the choke coil 22 are provided.
One end of the sensor 24 is connected to the intermediate terminal 20 of the primary winding 21
The other end is connected to the secondary winding 33c, and the choke coil 2
2 is connected to the power terminal 27 of the primary winding 21,
The other end 25 is connected to the secondary winding 33a. this
The discharge lamp ballast 30 includes a filament 32 of the fluorescent lamp 31a.
a of the fluorescent lamps 31a and 31b.
The secondary winding 33 is formed by connecting the filaments 32b and 32c in parallel.
b, and secondary to the filament 32d of the fluorescent lamp 31b.
The winding 33c is connected and used. Specifically, the power terminal
100V power supply between 27 and 28 or power supply terminals 27 and 29
When 200V power is supplied during this time, the discharge lamp ballast 30
And fire by the current from the secondary windings 33a, 33b, 33c.
Filaments 32a, 32b, 3 of light lamps 31a, 31b
2c and 32d are heated, and thermionic emission starts and
The voltage boosted by the ballast 30 is connected to the terminal 25 and the intermediate terminal.
Fluorescent lamp 3 connected from the capacitor 20 via the capacitor 24
1a, 31b is applied between the filaments 32a, 32d.
And the fluorescent light comes on. [0008] Here, in the above-mentioned use, the power supply
Il 22-discharge lamps 31a, 31b- condenser 24-medium
Between terminal 20 and winding 34 (intermediate terminal of primary winding 21)
Winding between 20 and power supply terminal 28 (or 29)-power supply
Series resonance circuit (LCR series resonance circuit)
This is apparent from FIG. Furthermore, this discharge lamp
In the ballast 30, the impedance of the series resonance circuit is
Value should be an impedance value that resonates with the third harmonic
The reactor of the choke coil 22 and the capacitor 24
Is set. Therefore, in the discharge lamp ballast 30 shown in FIG.
When the discharge lamps 31a and 31b are turned on, the choke coil 22 and the
And the capacitor 24 resonate with the third harmonic and receive super-regenerative reception
The impedance of the entire circuit is set to a certain value
Become normal. When such a resonance state is formed, the power supply
The voltage supplied between terminals 27 and 28 or between 27 and 29 is
Even if it fluctuates, the discharge state of the fluorescent lamps 31a and 31b is constant.
The lighting state is extremely stable. Prove such action
The ballast for a discharge lamp of the present invention shown in FIG.
(Ballast without capacitor 24 in FIG. 1)
Input current and luminous intensity when the supply voltage is varied.
Table 1 shows the results of measuring the fluctuation. [Table 1] The results in Table 1 are shown in the figure and the safety for the discharge lamp in FIG.
FIG. 2 shows a comparison between the ballast 30 and the conventional ballast.
You. 2 and Table 1, the discharge lamp ballast 30 shown in FIG.
When used, fluorescent lamps 31a, 3
It is determined that the lighting state of 1b is operating extremely stably.
You. In addition, in the conventional ballast, the luminous intensity fluctuation is close to 50%.
In contrast, the discharge lamp ballast 30 shown in FIG.
Due to the quality, the luminous intensity changes only about 6%, and the luminous intensity changes almost
You can see that they don't. Further, the conventional ballast and the safety for the discharge lamp shown in FIG.
Each lighting at the time of emitting the same luminous intensity using the fixed unit 30
When the partial potential was measured, the results shown in Table 2 were obtained. This measured value
Therefore, for example, the choke voltage at 100 V is the conventional 152 V
In contrast, in the case of the discharge lamp ballast 30 of FIG.
The difference of 58V is the effective voltage (shared) due to the resonance of the third harmonic.
Vibration voltage). Also, the power factor is close to 100%
You can also see that he's moving forward. These things are traditionally stable
The vessel was burned due to overheating and the life was said to be 7 to 8 years
However, the ballast 30 for a discharge lamp shown in FIG.
The next current is nearly half of the conventional type, so the calorific value is also (1/2)
² = about 1/4, the ballast burns like a conventional ballast
No worries and significantly extends lifespan
I do. [Table 2] FIG. 1 shows a ballast for a discharge lamp according to the present invention.
30 is used, the discharge voltage of the fluorescent lamps 31a and 31b
The waveform is slightly concave as shown in FIG. In contrast,
Fig. 4 shows the discharge voltage waveform when a ballast is used.
You. FIG. 5 shows both of these for comparison.
You. Further, the discharge lamp ballast 30 of the present invention shown in FIG.
When used, the discharge current waveforms of the fluorescent lamps 31a and 31b are shown in FIG.
As shown in Fig. 6, the discharge current when using the conventional ballast
The waveform is as shown in FIG. As can be seen from these figures,
Book that uses resonance of yoke coil 22 and capacitor 24
In the discharge lamp ballast 30 of the present invention, the choke coil 22
The electric charge stored in the condenser 24 is changed to the fluorescent lamps 31a, 31
The two ends of b differ in phase by 90 degrees with respect to the discharge current, respectively.
Since it acts as a voltage, the discharge voltage waveform
Waveform rises again in the middle of going up and turning off
A waveform containing the third harmonic with a typical flow (Fig.
4), the discharge current waveform is between the ends of the AC half-wave
It works in the middle of the work (Fig. 6). As a result,
A time-effective light-emitting effect appears, and the fluorescent light 31a,
The light emission of 31b is increased, and the flicker is reduced. this
Using the ballast 30 for a discharge lamp of FIG. 1 and a conventional ballast.
In order to generate approximately the same luminous intensity, it is necessary to use the discharge lamp safety lamp shown in FIG.
A small voltage is required for the fixed unit 30, resulting in significant labor saving.
Means Incidentally, the discharge lamp ballast 30 shown in FIG.
Input when generating approximately the same luminous intensity using conventional ballast
The current of the power supply is about 0.80 A in the discharge lamp ballast 30 of FIG.
The conventional ballast was 1.21A. That is, 0.80 / 1.21 = 0.
66, saving about 40% in required electrical capacity
You. The choke coil 22 and the capacitor 2
4 is a discharge lamp ballast 30 of FIG. 1 that resonates with the third harmonic.
Is that most of the third harmonic is
Efficiently absorbed and extinguished and leaking into the power circuit
Absent. Furthermore, since the third harmonic disappears, the third harmonic
The higher-order harmonics associated with are also extinguished. In addition, the figure
In the ballast 30 for discharge lamp 1, the filament of the discharge lamp 31a
The choke coil 22 between the
Are inserted in series, and the filament 32d of the discharge lamp 31b is inserted.
Winding 34 is inserted in series between the power supply terminal 28 or 29
Have been. Therefore, harmonics are completely eliminated by the resonance.
Even if not fully absorbed, the remaining harmonic
Leakage to the power supply circuit due to reactance of coil and winding
Exit is blocked. In addition, the same principle applies
Leakage into the source circuit is also prevented. When the ballast 30 for a discharge lamp shown in FIG . 1 is used.
And harmonics at power terminals 27, 28, or 29
The results of the measurement of the harmful wave leakage are shown in the waveform diagram of FIG.
The oscillograph of the examination of the Government-Academic Exchange Center
Was. In contrast, harmonics and disturbances when using the conventional ballast
The wave leakage measurement results were as shown in the waveform diagram of FIG. FIG.
See harmonics and disturbances that leak into the power supply
You can see that it is. In FIG. 8, harmonics and interference waves are seen.
Not. Examination summary of the Tokyo Denki University Industry-Government-Academia Exchange Center
Is as follows. Table 3 shows the results of this test.
It was right. 1. Requested test name: Characteristics test of ballast for discharge lamp in FIG . Test location: 4th floor, Building 11 of Tokyo Denki University Kanda School Building
Electrical engineering laboratory 3. Tester: Hitoshi Ishiyama, Department of Electrical Engineering, Faculty of Engineering, Tokyo Denki University
Lecturer 4. Examination date: July 7, 1998 and 1998
July 17 5. Measuring equipment: Product name Standard Manufacturer Digital power meter WT130 2535-03-C2-OM YEW synchroscope SS-7811 Iwasaki communication equipment universal close-up device US-8 Iwatsu electronic analog illuminometer TYPE3281A YOKOGAWA [Table 3] The impedance value of the series resonance circuit (5
0 cycle) is the impedance that resonates with the third harmonic.
In order to obtain a dance value, for example, the choke coil 2
2 has an effective reactance of about 500 to 3000Ω,
The capacity of the capacitor 24 is appropriately selected from the range of about 1 to 6 μF.
It is desirable to use other values in some cases.
They can be combined. The ballast for a discharge lamp according to the present invention has a power supply
Work coil-discharge lamp-capacitor-intermediate terminal-winding-electric
A series resonance circuit consisting of
The impedance value of the column resonance circuit resonates with the third harmonic
The capacitor and cho
The reactance of the work coil is set. Also discharge
The capacitor connected between one end of the lamp and the power supply;
Coil connected to the other end of the discharge lamp and the power supply.
Harmonic and disturbance waves are generated by the yoke coil and winding
It is made to be cut off from. Therefore, the following effects
There is fruit. 1. Harmonic and disturbance waves flowing into the power circuit (power system)
Is blocked, and other electronic devices or
Computer malfunction, noise interference to those devices, etc.
The negative effects are wiped out. 2. The choke coil and capacitor resonate at the third harmonic
The third harmonic and higher order
Harmonics are effectively eliminated by resonance. Therefore, the power supply
Malfunction of other electronic devices or computers connected to the circuit
No crops or bad effects. 3. In the conventional ballast, the luminous intensity fluctuation is close to 50%
On the other hand, in the ballast for a discharge lamp of the present invention, it is only about 6%.
And the luminosity hardly changes. 3. Consumption required to obtain the same amount of light using the same fluorescent lamp
The power consumption was reduced by about 20% compared to the past. Therefore, the highway
Use a large number of discharge mercury lamps and fluorescent lamps
Or if you use many sodium lamps in the tunnel
Can achieve significant power savings. 4. The component circuit of the ballast for the discharge lamp
Take the power of today's distribution circuit circuits with a lot of reactive power loads
It also helps improve the rate. 5. Choke connected between the other end of the discharge lamp and the power supply
Harmonics and disturbances due to coil and winding reactance
And is prevented from leaking into the power supply circuit. Originally harmonic
Or a four-terminal network filter to block
The present invention devises a lighting circuit.
This achieves this goal. 6. ± 6V fluctuation from power supply voltage of 95V to 107V
Input current change ± 1.15% and luminous intensity change ± 1%
And has extremely good stability. 7. The discharge voltage waveform of the fluorescent lamp is as shown in FIG.
Lighting time is longer compared to half wave,
Time is shorter. Therefore, the amount of light increases and flickers
There is little feeling. Look at the examination results of the industry-government-academia exchange center in Table 1.
As a result, it was possible to obtain a result with a large amount of light emission with labor saving.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram showing an example of a ballast for a discharge lamp according to the present invention. FIG. 2 shows the stability of the conventional ballast and the discharge lamp of the present invention.
Of input current against input power supply voltage fluctuation when using a switch
FIG. FIG. 3 shows discharge lamp discharge when the ballast for a discharge lamp of the present invention is used.
Voltage waveform diagram. FIG. 4 shows a discharge lamp discharge voltage waveform when a conventional ballast is used.
FIG. FIG. 5 is a superimposition comparison diagram of the discharge voltage waveforms of FIGS. FIG. 6 shows points of a discharge lamp when the ballast for a discharge lamp of the present invention is used.
Lamp current waveform diagram. FIG. 7: Lighting current wave of a discharge lamp when using a conventional ballast
form. FIG. 8 shows harmonic noise leakage at the power supply terminal of the present invention .
FIG. FIG. 9 shows harmonic noise leakage at a conventional power supply terminal.
FIG. FIG. 10 shows current waveforms in a conventional discharge lamp system.
FIG. DESCRIPTION OF SYMBOLS 20 Intermediate terminal 21 Primary winding 22 Choke coil 23 Iron core 24 Capacitor 25 Other end of choke coil 26 One end of choke coil 27, 28, 29 Power supply terminal 30 Discharge ballasts 31a, 31b of the present invention Electric lights 32a, 32b, 32c, 32d Filaments 33a, 33b, 33c Secondary winding 34 Winding

Continuation of the front page (56) References JP-A-1-100894 (JP, A) JP-A-57-187898 (JP, A) JP-A-52-118972 (JP, A) Jpn. , U) Special Table Hei 8-511901 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 41/16-41/29

Claims (1)

(57) Claims 1. An iron core, a primary winding having a power supply terminal and an intermediate terminal, a plurality of secondary windings, and the intermediate terminal and one end of a discharge lamp connected to the intermediate terminal. And a choke coil connected between a power supply terminal of the primary winding and a secondary winding connected to the other end of the discharge lamp. The power supply-choke coil-discharge lamp-capacitor-intermediate terminal-winding that is a part of the primary winding-
A series resonance circuit consisting of a power supply can be formed, and
The capacitor so that the impedance value of the formed series resonance circuit becomes an impedance value that resonates with the third harmonic.
Set the reactance of service and the choke coil, further, the Kimaki line before being connected between one end side and the power of the discharge lamp, connected to said Cho between the other end side and the power of the discharge lamp < A ballast for a discharge lamp, wherein a harmonic coil and a disturbance wave are cut off from a power supply by a brake coil.