JPS5916296A - Device for starting 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] The present invention relates to a discharge lamp starting device.

Figure 1 shows the conventional single-light market starting equipment. That is, by applying the power supply voltage Vs, the redundant device 1, the filament island of the discharge illusion 2, the terminal a, the guide wire 4. Normally closed thermal switch 3.
@Chisu, a half-wave preheating current flows through two filaments F, and in the half cycle of the shell, υ due to the voltage at both terminals of the diode 40.
The main heater 5 lights up, heats the main bimetal 3ai of the thermal switch 3, and - after a short period of time, the bimetal 3a moves in the direction of arrow At the beginning of the larva extraction when the terminals a and b luj become low 1, the constant voltage diode 8〃) is turned off, and the diode 72 foot voltage tie auto 8. Resistance9. No current flows through the circuit of the heater IO, and a current smaller than that during preheating flows through the main heater 5 through the resistor 6, causing the main heater 5 to switch to the point iJ T
h Continue - Continue the open state of the Mars suite 0 If the discharge lamp 2 fails to light up, tJ, terminal a.

What is the voltage between 6? ”＞%(Jl?, voltage rises to 0, so the foot voltage exceeds diode 8 and resistor 9.
A current flows through the auxiliary heater lO for follow-up 1, heating the compensating bimetal 3bi provided in opposition to the BC main bimetal in front of the thermal switch 3, and heating the main bimetal 3a.
After a short period of time, the thermal switch 3 closes and enters preheating again, repeating this operation.

In the above device, when the filament of the discharge lamp reaches the end of its life and reaches the emissionless state, the thermal switch 3- repeatedly opens and closes and blinks, causing discomfort, resulting in unnecessary power consumption and safety concerns. There are disadvantages such as overheating of the device and wear and tear of the contacts of the thermal switch 3. The present invention was proposed in order to improve the runner-up point, and in a discharge lamp starting device using a thermal switch, when the lamp reaches the end of its life such as Emiles, a start discrimination circuit is used using a thermistor or CR timer. By locking the thermal switch after one hour and keeping the thermal switch open, the starter stops blinking, eliminating the discomfort caused by flickering, reducing wasted power consumption, and preventing overheating of the ballast, etc. It is something to do.

Next, FIG.

FIG. 2 shows one embodiment of the present invention.

In contrast to the circuit diagram shown in Fig. 1, a heat-sensitive element 11 such as a thermistor is installed in parallel with the auxiliary heater lO for 1M71'' heating, and is thermally coupled to a heating element such as a resistor 9. When a state such as discharge burns and no emission occurs, the resistance of the auxiliary heater decreases after one hour due to heating of the thermistor, and the auxiliary heater flows. The thermal switch 3 is continuously kept open without bending to the bimetal 3a side, the preheating current is cut off, and the starter is stopped.

FIG. 3 shows another embodiment, in which a transistor 12' is provided in parallel with the auxiliary heater lO, and a resistor 13 is provided.

Due to the CR timer of the capacitor 14, the voltage across the capacitor increases due to the current flowing to the capacitor C, and after a certain period of time, the voltage across the capacitor increases through the constant voltage diode 1G to the transistor 1.
The base current of the transistor 2' is distorted, the transistor 12'i is cut off, and the starter operation is stopped in the same way as in FIG. 12.

FIG. 4 shows another embodiment, in which resistors 18 and 19 are used as a start determination circuit in place of the constant voltage diode 80 in FIG.
The voltage is divided by voltage regulator diode 21, transistor 2
When the discharge lamp 2 is normally lit, the transistor 22 is turned off, the transistor 27 is also turned off, the auxiliary heater 10 is stopped, and the thermal switch 3 is kept open. The transistors 22 and 23 remain on, the auxiliary heater IO operates, and the thermal switch repeats opening and closing, but after a certain period of time, the temperature of the thermistor 26 rises due to heating of the resistor 24, the resistance value decreases, and the transistor 27 is turned off, the auxiliary heater is opened, and the starter operation is stopped.
6 and a resistor 30 instead of the heating resistor 24. capacitor 31
CR timer and π voltage diode transistor 34
The transistor 36 is turned off and the auxiliary heater is opened by the switch of FIG. The element (PTC) 12 is connected, the PTC 12ji is heated using the heat generated by the constant voltage tie auto 8, etc., and as the resistance value increases, the auxiliary heater voltage is decreased and the starter is stopped.

FIG. 7 shows another embodiment of the present invention. In this device, when the discharge burner 2 fails to light up, the voltage between terminals a and b also increases due to the power supply voltage, so that the constant voltage does not change. The iode 44 is conductive, the transistor 45 is conductive, the auxiliary heater lO for approaching is turned on, and the iC in front of the thermal switch 3 is turned on.
The supplementary bimetal 3bk installed in opposition to the main bimetal 3a heats up, bends toward the main bimetal, and after a short period of time, the thermal switch 3 closes and enters re-preheating tC, repeats the operation, and starts discharging or firing. leading to.

When a discharge lamp reaches the end of its life, such as when it becomes emitterless.

The contact point of the thermal switch 3 blinks and repeats, but the transistor 45 turns on and the resistor 43 generates heat, which heats the 46 heat-sensitive elements such as thermistors that are thermally coupled to the resistor 43.
After a short period of time, the resistance value of the thermistor 12 decreases, the preload voltage across the voltage dividing resistor 42 becomes low, and the base voltage tN to the transistor via the constant voltage diode 44 becomes 0, the transistor 43 is cut off, and the auxiliary heater lO will be released. As a result, when the auxiliary bimetal cools and no longer bends, the thermal switch 3 is opened, stopping the starter operation, causing discomfort due to flickering, wasted power consumption, overheating of the ballast, etc.? It can be prevented.

Figures m8 and 9 show another embodiment 7 of the invention.In this device, in the circuit shown in Figure 7, the voltage across the voltage dividing resistor 42 is further divided by two heat sensitive elements 46 and 47 such as thermistors. The heating resistor 43 is thermally coupled to the thermistor 46 connected to the emitter side of the transistor 4S.

Even if the ambient temperature changes, the resistance values of heat-sensitive elements 46 and 47 such as thermistors change at the same ratio, and the heat-sensitive elements 46 and 47 of the thermistor 47 are heated by the heating resistor 43, and the periphery of the thermistor 47 is constantly warmed and rises due to constant temperature expansion.

Therefore, when the ambient temperature changes by 1, the partial pressure ratio changes. Therefore, when the I-run raster 45 is in the cut-off state, 1 [j] will burn even if the ambient temperature is still low. It becomes constant.

Figure 9 is another embodiment of the non-invention, and Figure 8 is an implementation? 1l
``'L for eC: IiJ, l1 of anti-mark and thermistor 46
ffllfi is simply replaced, and as in the embodiment shown in Fig. 8, the operating time is always VC-foot due to changes in ambient temperature. Fig. 1O shows another embodiment of the invention. is used as an auxiliary heater to generate heat from the constant voltage diode 54,
A thermistor lli is connected in parallel with the constant voltage guide 54, and the thermistor 55' (f) is thermally coupled to the series resistor 53.

At normal temperature, the thermistor resistance value is very low, and when the rung is on, the preload voltage at both ends of a and b is low, so no current flows beyond the constant voltage diode 54, and the current flows through the resistor 53. is very small and the amount of heat generated by the resistor & is also small and the temperature of the thermistor 55 does not rise, so it remains in the 1 state.

When the discharge lamp reaches the emissive state at the end of its life, the voltage between terminals a and b exceeds the threshold 11fL of the constant voltage diode 54, causing the diode 52, resistor 53. Current flows through the series circuit of the constant voltage diode 54, and the resistor 53
The constant voltage diode 54 generates heat, and the constant voltage diode 54 is connected to the auxiliary bimetal 3b' (f-
It heats up, the thermal switch closes, the re-preheating operation VC enters, and the operation sound returns υ. On the other hand, the thermistor 55 is heated by the heat generated by the low resistance 53, and the resistance value of the thermistor 55 decreases as the temperature of the thermistor increases. Resistance value (voltage of constant voltage diode 54/resistance of thermistor)
After that, the current flowing through the constant voltage diode 54 becomes zero, the auxiliary bimetal is no longer heated, and the thermal switch 3 reliably maintains the open tumor. In this way, by locking the VC after a certain period of time by the timer circuit of the discharge phantom start discrimination circuit and cutting off the auxiliary heater, the starter operation is stopped. - (b) It has excellent effects such as suppressing wasteful power consumption, preventing deterioration of the Hiff ballast due to overheating, and (ii) eliminating wear and tear on the contacts of the thermal switch.

[Brief explanation of the drawing]

FIG. 1 shows an example of this plum release illusion starting device, FIG. 2 shows an embodiment of the invention, and FIGS. 3 to 1O show another embodiment 7 of the invention. 1...Ballast %2...Discharge lamp, 3...
...Thermal switch s 3a...Main bimetal, 3b...Auxiliary bimetal, 4...
...Diode, 5...Main heater, 6...
・・Resistance, 7・・Taiyoto, 8・・・・
・Redundant voltage diode, 9... Resistor, 10...
...1 Sode assistant heater, 11... Thermistor, 12'... Transistor Patent applicant Matsushita Electric Works Co., Ltd. 1st figure 2nd figure 3rd figure 4th figure 5th figure et al. Figure 6 Procedures No. 1n Authorized (spontaneous) 1゜August 29, 1988 2゜Director of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent Application No. 110732 2, Name of the invention Discharge lamp Starter device 3, relationship to the amended case Name of patent applicant (583) Matsushita Electric Works Co., Ltd. 4, Agent
Person: 160 Address: 1'-5, 7th floor, 2nd Mizota Building, 7-5-10 Nishi-Shinjuku, Shinjuku-ku, Tokyo, Column 6 of "Detailed Description of the Invention" of the specification to be amended, Attachment to the contents of the amendment The 5th line of page 7 of the specification is corrected to read ``Thermistor 12+ is r thermistor 46.''"Transistor43" on page 7, line 8 is corrected to "transistor 45."

Claims (1)

[Claims] A series circuit consisting of an inductive ballast and a discharge lamp connected to a commercial power source, a main thermally responsive element in parallel with the discharge lamp, and an auxiliary thermally responsive element installed opposite the main thermally responsive element. A thermal switch is connected, a main heater is provided on the main thermally responsive element, an auxiliary heater is provided on the auxiliary thermally responsive element, a start discrimination circuit is provided in parallel with the thermal switch, and when starting fails, an output signal of the start discrimination circuit is used to In a device that lights up the auxiliary heater, completely recloses the thermal switch, and restarts the device,
A timer circuit is provided that is activated by the starting operation of the discharge lamp.
A discharge lamp starting device characterized in that a thermal switch is opened by decreasing and stopping an auxiliary heater current after a short period of time, and stopping an initial #iJJ operation.