JPS60250597A - Discharge lamp starter - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Kono] This invention relates to a discharge lamp starting device for fluorescent lamps, HID lamps, and the like.

(Background Art) FIG. 4 shows a conventional example. In the figure, 1 is an AC power supply, 2
is an inductive ballast, 3 is a discharge lamp, f, , f2 is its electrode,
5 is a pulse transformer, W, and W2 are its primary winding and secondary winding, 6 is a two-terminal sirisk, and 7 is a charging/discharging capacitor.

This conventional example is also called an electronic starter method, which improves the shortcomings of the general glow lamp method and has a long life and
It has the effect of instant lighting.

The operation is exactly as shown. That is, when the power supply voltage is applied, the voltage across the capacitor 7 increases, and when it reaches the breakover voltage of the S1 list, the charge on the capacitor 7 is transferred to the primary winding W1 of the pulse transformer 5. Discharge occurs in a closed circuit passing through the thyristor 6, a high voltage pulse voltage is applied to the secondary winding w2 of the pulse transformer 5, and this is repeated to start the discharge lamp l using the preheating current and pulse voltage.

This conventional example has the following problems. That is, 2
The operating point of the terminal thyristor 6 must be set between the peak value of the lamp voltage during lighting and the peak value of the power supply voltage. There is a problem that the pulse width is narrow, the generated pulse voltage is low, and the starting performance of the discharge lamp 3 is poor.

In addition, both electrodes f1゜f2 of the discharge lamp 3 immediately after the power supply voltage is applied
Since pulses are generated from a low temperature, cold cathode discharge occurs and the life of the discharge lamp 3 is shortened.

Another conventional example is shown in FIGS. 5 and 6. $11 for the figure.
N, 8 is a capacitor, and 9 is a switch such as a push button. This is an example of a switch-start starting method used in fluorescent lamp stands and the like.

By turning on the switch 9 for about 1 second, both electrodes f,
, f2 is preheated and then when switch 9 is turned off,
゛Due to the action of the inductance of the ballast 2, the switch 9
A kick voltage is generated between both ends a and b, and an arc is generated between the contacts of the switch 9, resulting in the appearance of a sawtooth wave as shown in FIG.

That is, when the switch 9 is turned off at time t], the current flowing through the stabilizer 2 becomes a charging current for the capacitor 8, and the voltage between both ends a and b increases from time t1 to v
When the voltage reaches a high voltage of 200 to 700 (1), an arc occurs between both contacts of the switch 9, and due to the negative characteristics of the arc, the charge on the capacitor 8 is instantaneously relayed at time t2, causing the voltage to rise between both ends. a.

The voltage between 5 and 5 quickly decreases to zero, and discharge 1 ends.Then, the arc between the contacts disappears, and 5 returns to the insulated state. Then, charging of the capacitor 8 is started again, and the same process is repeated thereafter to oscillate and start and light the discharge lamp 3.

However, this had the problem of requiring careful switch operation, which often resulted in starting errors. , 5.9 [Object of the invention] ・ ・ ・ ・ ・ The purpose of this invention is to improve the discharge lamp startability ψ, to eliminate cold cathode discharge, to extend the lamp life, and to provide a lamp that is inexpensive and has excellent operability. It is an object of the present invention to provide a discharge lamp starting position. ,
, [Disclosure of the invention] 1.

The discharge lamp starting device of the present invention includes a ballast having an inductive impedance connected to a power source, a discharge lamp connected to the ballast, and a normally closed time limit switch connected to the non-power side of the electrode of the discharge lamp. 1, which is connected to this time limit switch and becomes energized or de-energized by turning on or off this time limit switch.
A pulse transformer having a secondary winding, and a secondary winding in the pulse transformer connected to the non-power supply side of the electric lamp to start and light the discharge lamp by applying a pulse. It is something that In this configuration, a first embodiment of the present invention will be described based on FIG. 1.

Stabilizer 2. Heater 11. One electrode f1 of the discharge lamp 3, the secondary winding W21 of the pulse transformer 5. Thermal switch as a normally closed time limit switch 10. The other electrode of the discharge lamp 3 (2,
A series circuit of is connected to an AC power supply 1. At least one of the contacts 12 and 13 of the thermal switch 10 uses a thermally responsive element such as a bimetal. A series circuit of a secondary winding W1° of a pulse transformer 5 and a capacitor 7 is connected between both contacts 12 and 13.

When the AC power source 1 is turned on, a current flows through the series circuit passing through the heater 11, and both electrodes f, r2 are heated. At the same time, the thermal switch 10 is heated by the heater 11, and after a certain period of about 1 second, the contacts of the thermal switch 10 are turned off, and an arc is generated between both contacts 12 and 13. Sawtooth oscillations occur between both contacts 12,13. As a result, the capacitor 7 is repeatedly charged and discharged, and when the discharge current of the capacitor 7 flows to the primary winding W1 of the pulse transformer 5, the secondary winding W
Since a high voltage pulse voltage is induced in the discharge lamp 2 and applied between both terminals of the discharge lamp 3, the discharge lamp 3 starts immediately.

After the discharge lamp 3 is started, the lamp lighting current continues to flow through the heater 11, so the thermal switch 10 is maintained in its OFF state, and the discharge lamp 3 continues to be lit.

This embodiment has the following advantages over the conventional example. In other words, (11 The difference in charging and discharging voltage of capacitor is thyristor 6
In this case, the discharge lamp 3 could not be started unless it was set lower than the peak value of the power supply voltage, but in this embodiment, the difference in charging and discharging voltage is more than double to 200 to 400 (V). and the pulse voltage peak becomes higher.In other words,
Starting performance has been improved.

(2) Since the thermal switch 10 is in a short-circuit state during preheating, a larger preheating current flows through the thermal switch 10 than through the thyristor 6 of the conventional example, and the starting performance of the electric lamp 3 is faster by a fraction thereof. Become.

(3) In the conventional example, the thyristor 6 conducts at low temperatures, causing startup failure, but in this example, the thermal switch 10 is heated by the heater 11 during lighting, and the off state is maintained, so the discharge lamp 3. Even if the re-ignition voltage becomes high due to the low temperature, the engine will not fail to start.

(4) Before starting, the thermal switch 10 maintains the on state for a certain period of time and does not generate pulse voltage during preheating, so cold cathode emission does not occur and the lamp life is extended. Become.

(5) Compared to thyristor 6, thermal switch 10 is cheaper.

A second embodiment will be described based on FIG. 2.

Stabilizer 2. One electrode f1 of the discharge lamp 3. First dual switch 10. A series circuit of the primary winding w+ of the pulse transformer 5 and the other electrode f2 of the discharge lamp 3 is connected to the AC power source 1be). diode 1
4 connects its cathode to Sanimal Sui Nochi 1'0.

A secondary winding W2 of the pulse transformer 5 is connected to a conductor a provided near the center of the discharge lamp 3 via a capacitor 18, and is connected between the electrodes f, f2 of the discharge lamp 3 for heating the thermal switch 19. Heater 15° Said first diode 14
and a second diode 16. of opposite polarity. A series circuit of resistor 17 is connected. The first diode 4 and the second diode 16 are cathode-to-cathode connected, and a heater 15 is connected between the connection point and the anode of the first diode 14.
5 are connected.

Further, on the non-power supply side, a series circuit of a capacitor 38 and a small resistor 19 is connected between both electrodes fl+f2.

. , - Since the other parts are the same as those in the first embodiment, the same parts are given the same reference numerals and the explanation will be omitted.

Tiode 14. Thermal switch edge 10. Primary winding W
A half-wave preheating current of the AC power supply 1 is passed through the AC power source 1 through the AC power supply 1, and a current is passed through the heater 15 through the second diode 16 in the opposite half-wave to heat the thermal switch 10. After a certain period of time, the thermal switch 10 turns off, and both contacts 12.13
An arc force is generated between the two. At the same time, pulse transformer 5
The high-voltage pulse voltage generated in the secondary winding W2 is applied to the central conductor a of the discharge lamp 3 via the capacitor 18, and this assists in starting, thereby making it possible to stably start the discharge lamp 3. .

After the discharge lamp 3 is turned on, the resistor 17. Since current continues to flow through the heater 15 via the diode 16, the thermal switch 10 is maintained in the off state. capacitor 8
A small resistor 19 connected in series with the capacitor 8 suppresses the peak of the discharge current from the capacitor 8.

According to this second embodiment, in addition to the effects (1) to (5) above, it is possible to reduce the suppressing force of inductance based on half-wave preheating and increase the preheating current, thereby reducing the starting time. This has the effect of being able to shorten the time.

A third embodiment will be described based on FIG.

The discharge lamp 3 is a non-preheating type such as an HID, and the stable N2 is a leakage transformer type.

Thermal switch 10. Heater 15 for heating the thermal switch 10. A series circuit of the primary winding W of the pulse transformer 5 connects both electrodes f1. of the discharge lamp 3. f2, and a secondary winding W2 of the pulse transformer 5 is connected to a conductor 20 wound around the discharge lamp 3.

A capacitor 21 is connected to the AC power source 1 between the electrodes r, f2 of the discharge lamp 3.

The thermal switch 10 is arranged near the discharge lamp 3 so as to easily receive the heat generated from the discharge lamp 3.

When the thermal switch 10 is turned off, the current flowing through the heater 15 disappears, the heater 15 is cooled down, and the thermal switch 10 is turned on again to heat the heater 15.

By repeating this, a pulse voltage is intermittently applied to the discharge lamp 3, and as a result, the discharge lamp 3 is started. When the discharge lamp 3 is turned on, the heat generated from the discharge lamp 3 continues to heat the thermal switch 10 near the discharge lamp 3, and maintains the off state.

The effects of this third embodiment are also similar to those of the previous two embodiments.

〔Effect of the invention〕

According to this invention, the startability of the discharge lamp is improved, cold cathode discharge is prevented, and the lamp life can be extended.
Moreover, it has the effect of providing excellent operability at low levels.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of the first embodiment of the present invention, Fig. 2 is an electric circuit diagram of the second embodiment, Fig. 3 is an electric circuit diagram of the third embodiment, and Fig. 4 is a conventional electrical circuit diagram. FIG. 5 is an electric circuit diagram of an example, and FIG. 6 is a waveform diagram of one set of electric circuits of another conventional example.
・□' 1... AC power supply, 2... regulator, 3... discharge lamp,
5...Pulse transformer, 7...Capacitor, 8...
・Capacitor, 10... Thermal switch (time limit switch), 11... Heater, 14... Diode, 1
5・□・Heater, 1゛8・Capacitor, 20・・
・Conductor, a... Conductor", fl. f2... Electrode, Wl... Primary winding, w2... Secondary winding, ''' 111 1 to 211I 4WA 2 Fig. 5 □ Poem Figure 6

Claims (1)

[Claims] ゛(l) A ballast having an inductive impedance connected to a power source, and a discharge lamp connected to the ballast;
)'□ A normally closed time-limit switch connected to the non-power supply il of the electrode of the discharge lamp, and a pulse transformer having a primary winding that is energized and de-energized by being connected to this time-limit switch and turned off. and a secondary winding in the pulse transformer connected to the non-power supply side of the discharge lamp to start and light the discharge lamp by applying pulses. (2) the time limit switch; is a thermal switch, and the thermal switch is connected to the secondary winding, the discharge lamp electrode, and the heater for this thermal switch.A series circuit of the ballast is connected to the thermal switch, and the primary winding is connected to the thermal switch. 1. For charging and discharging: a discharge lamp starting device according to claim (1), in which a series circuit of capacitors is connected; (3) the time limit switch is a thermal switch;
A series circuit consisting of a first diode, the primary winding, and one electrode of the discharge lamp is connected to this thermal switch, and the secondary winding is provided near the center of the discharge lamp via a capacitor. A heating heater of the thermal switch is connected to a conductor, and a series circuit of a diion of opposite polarity to that of the first diode is connected between the control electrodes of the discharge lamp. The discharge lamp starting device according to item (1). (4) The time limit switch is a thermal switch, and a series circuit of the circuit switch, a heater of the thermal switch, and the primary winding is connected to both electrodes of the discharge lamp, and the secondary winding A discharge lamp starting device 6 according to claim (1), wherein the wire is connected to a conductor provided near the discharge lamp.