JPS6039795A - 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 [Technical Field] The present invention relates to a discharge lamp starting device for starting a hot cathode type discharge lamp.

[Background technology]

Conventionally, a Jiro starter has been widely used as a starting device for a discharge lamp with a preheating filament, especially a fluorescent lamp. The disadvantage is that the time required from turning on the power to starting the fluorescent lamp is long, several seconds, and the lifespan of the Giro starter is shorter than that of the lighting device itself. Ta. On the other hand, in order to shorten the time required to start a discharge lamp, a so-called electronic starter that combines a semiconductor switching element and a high-voltage pulse generation transformer has been proposed, but it is expensive and shortens the life of the discharge lamp. ◇ In addition, such conventional starting devices have the disadvantage that the emitter of the discharge lamp (
When the discharge lamp reaches the end of its lifespan due to wear and tear of the electronic radioactive materials (electronic radioactive materials) (hereinafter referred to as the 13-starless state), the starting operation of the discharge lamp is repeated, and power loss due to preheating current increases.・The lighting device had the disadvantage of causing an abnormal temperature rise in the main body. [Object of the Invention] The present invention has been made in view of the above-mentioned problems. It is an object of the present invention to provide a discharge lamp starting device which is capable of repeatedly stopping the starting operation and preventing abnormal temperature rise, and which has a shorter starting time than one using a Giro starter and has a longer life. This is the purpose.

[Disclosure of the invention]

The present invention will be explained in detail below. First, FIG. 1(a) is a circuit diagram showing the basic configuration of a discharge lamp starting device according to the present invention. In the circuit shown in the figure, a commercial power supply Vs and an inductive current-limiting element Bl (an inductive current-limiting element may be used with equal constraints due to a leakage flux transformer).
and a discharge lamp DL with a preheating filament are connected in series, and the starting device A of the discharge lamp is connected to two terminals on the lamp non-power supply side among the terminals of the preheating filament of the discharge lamp DL. Yes □This discharge lamp starting device A has a switch means SWI, which is normally closed.When starting the discharge lamp DL, when the commercial power supply VS is turned on, the discharge lamp DL is turned on for a certain period of time. The filament is preheated and opened after the same period of time, and by the inductive current limiting element Bs,
A Norse voltage is generated across the discharge lamp DL, and the discharge lamp D
Start L. The switch means SW1 has a structure in which two bimetals are formed, and opposing contacts are formed on the bimetals.The operation of the bimetals is as follows: At least one of the two bimetals r At least one thermally coupled For bimetal heating - Controlled by -9 and the same -
The switch has a function of circuiting the switch means SW+ at the time of starting the discharge lamp, and a holding function of keeping the switch means SWI in the open state while the discharge lamp DL is lit. Good □Furthermore, a contact point C1 is formed close to either one of the two bimetals, and the switching means SW> is repeatedly opened and closed when the discharge lamp DL is emitterless.

During operation, one of the curved bimetals and contact point C1
It is detected that the discharge lamp DL is at the end of its lifespan and is in a stagnant state by contact with the discharge lamp DL, and performs the following urine protection operation.

(2) The switch means SWs is held in an open state or a closed state to stop repeating the preheating operation of the filament of the discharge lamp DL.

■ Contact between the switch means SWz or at least one bimetal and the contact CI forms a closed circuit to continue the preheating state of the filament of the discharge lamp DL, and the preheating current of the filament causes the positive temperature thermistor (PT
C) Alternatively, provide a protective measure that shuts off the preheating current after a certain period of time by activating a device that combines a temperature fuse or thermal protector that opens at high temperatures and a resistor as a heating element, or a timer. Suppress filament preheating current.

The uninvented structure will be explained in detail below with reference to a specific embodiment. ・Figure 1(b) is a circuit diagram of one embodiment of the present invention. The current-limiting element B1, which contains a typical impedance, is connected to the filament F1 through a series circuit with H1. A discharge lamp DL having Fte is connected. On the non-power side of the discharge lamp DL, a switch means SW1 and a diode DL for supplying half-wave preheating current are provided.
and the series circuit of positive characteristic thermistor P1 is connected to H1, which is attached to the surface of one bimetal BMI of the two bimetals composing the switch means SWs, that is, bimetal BMs and BMt. . When this bimetallic BM is heated, it is driven in the direction in which the contacts open. Furthermore, when the bimetal BM■ is heated, it is driven in the direction in which the contacts close. A contact C1 is provided at a close position on the bimetal BM1. The switch means SWt is J\Imetal BMi.

This switch has a contact on 13M5, and is closed when the discharge lamp DL is started. AC fuiVs in this state
When input, a preheating current flows through the current limiting element B1, the diode H1, the filament F1, the diode Dl, the switch element SW1, the positive temperature coefficient thermistor P1, and the filament F, and the preheating current flows through the filaments Fl, F! is preheated. Furthermore, the bimetallic BMs thermally coupled to the bimetallic BMl are heated at the same time, so that the bimetallic BMs is thermally bent and the switch SWt is opened.

At this time, since the preheating current of the filaments F+ and Ft is cut off, high voltage starting SSS soot is generated at both ends of the discharge lamp DL due to the current limiting element BL including inductive impedance, and the discharge lamp DL is started. After starting, the heater H1 is heated by the tube current of the discharge lamp DL, and the open state of the switch element SWs is maintained.

When the discharge lamp DL becomes 1 or 3 starless, the switch means SWs is repeatedly turned on and off. Conventionally, the life of the contacts of the switch means SW+ is shortened. In the worst case, the contacts may be welded. There is a problem that the current limiting element B1 having an inductive voltage rises abnormally in temperature, but in the present invention, when the curvature of the bimetal BMs becomes large due to repeated oscillations of the switch means SWl.・Contact C1 close to bimetal BMs
and bimetal BM1 come into contact, and diode D! Since a closed circuit is formed between the bimetal BM+, the contact C1, and the positive temperature coefficient thermistor Pl, the switch H1 is heated continuously.The contact between the contact C1 and the bimetal BMI is maintained.This causes the filament to The preheating current flows for a while, but eventually the positive temperature coefficient thermistor (PTC) Pt becomes high in resistance due to heat generation, and the filament preheating current is suppressed.
Abnormal temperature rise of the inductive current limiting element Bz is prevented. The circuit shown in Fig. 1(c) is the circuit shown in Fig. 1(b) with the diode D1 for half-wave preheating removed, and in order to perform double-wave preheating, the impedance of the inductive current limiting element Bl Although the tank is larger and the filament preheating current is slightly smaller than in the case of half-wave preheating, the operation is similar to that shown in FIG. 1(b).

FIG. 2(a) is a circuit diagram of another embodiment of the present invention. In this embodiment, a zener diode zD1 is connected in parallel with the switch means SW+ in the circuit of FIG. 1(b). , resistor R1, and an auxiliary resistor Hf are connected in series. In the embodiment of FIG. 1(b) described above, the discharge lamp D
If L fails to start or once the AC power supply Vsf is turned on while the light is on? c When disconnecting and immediately turning on the power again to perform a so-called restart, use a curved bimetal BM.
Although it takes some time for I to return to its original position, the embodiment shown in Figure 2 (a) is an improvement on this point. below@
2. Explaining the operation of the circuit shown in Fig. 2(a). When restarting the discharge lamp DL, the voltage at the two terminals C and D on the non-power supply side of the discharge lamp DL is 0 is equal to the power supply voltage, where ``J'' diode ZDl
The Zener voltage of is set to be in a conductive state when the power supply voltage is applied, and to be non-conductive at the tube voltage while the discharge lamp DL is lit. Therefore, when restarting the discharge lamp DL, the auxiliary voltage is set to H8 is energized and heated. Assist and have sex all night! is thermally coupled with the bimetal BM1, and the bimetal 48M is assisted by the bimetal BM1. The bimetal BM deforms in the contact closing direction due to heating from
Since the time it takes to restore contact between + and bimetal BM3 can be shortened, restart time can be shortened.
Next, when the discharge lamp DL is in the 13-pointless state, the 13 Imetal B
The contact C1 close to MI and the bimetal BMi come into contact with each other, and thereafter maintain this contact state due to the heat generated by the heater H1, thereby stopping the repeated opening/closing operation of the contact of the switch means SWI, and the discharge lamp DL. Since the preheating current can be suppressed by the positive temperature coefficient thermistor P1, it is possible to prevent an abnormal temperature rise in the current limiting element B1. The circuit of FIG. 2(b) removes the half-wave preheating diode D1 from the circuit of FIG. 2(a), and also replaces the Zener diode zD! - It is added in series with the zener diode zD1, and it supports the positive and negative cycle of the AC power supply Vs as explained in Fig. 2 (a) above, and heats the H3 overnight. The other functions are the same as those in FIG. 2(a).

FIG. 3 is a circuit diagram of still another embodiment of the present invention. In the circuit shown in FIG. 3, the basic operation of the main heater H1 and the auxiliary Ito Is is the same as in the above embodiment, but in this embodiment, when restarting the discharge lamp DL, that is, the main When a substantially power supply voltage is applied to both ends of the discharge lamp DL with the switch SWu open, a voltage value determined by the resistance values of the heater H1 and the resistor Rx is applied to the heater Hs, and the heater H1 is heated. Bimetallic BMI is curved,
As a result, the bimetal BM1 performs an operation that follows the bimetal BMI by heating for a short time overnight.However, even in this embodiment, when the discharge lamp DL becomes the emitterless state, the bimetal BMs and BM ■ is curved due to repeated heating of the main Ht and the auxiliary BMs, and the bimetal BMI and the contact C1
, and from then on, this state is maintained and the switch means S
In addition to stopping the repeated opening and closing operations of W1, the E-characteristic thermistor Ps suppresses the preheating current. When contact CI and bimetal BMI are in contact, a bypass path passing through diode D, bimetal BM1, and contact C1 is formed during the positive half cycle of AC power supply Vs. No heating takes place. Also, in the negative half cycle of AC power supply VS...
Since the resistor R is short-circuited due to the contact between the contact C1 and the bimetal BMs, the heating of -91(l) is intensified, and there is a monomer that maintains the closed circuit state of the contact C1 and the JS bimetal BMI. During the half cycle, the diode DI is present, so it still assists and does not get heated overnight.

FIG. 4 is a circuit diagram of another embodiment of the present invention.

In FIG. 4, the main operations of Itoyo H1 and auxiliary Itoyo Mountain are the same as in the above-mentioned embodiment. In this embodiment, while the discharge lamp DL is lit, the AC power supply During the negative half cycle of Vs, a voltage approximately equal to the Zener voltage of the Zener diode ZD4 is applied across Hs. That is, in this embodiment, the AC power supply V
During the negative half cycle of S, the transistor Q1 is on and both ends of the Zener diode ZDs are shorted, so the voltage applied to H1 is basically equal to the Zener voltage of the Zener diode ZD4. The voltages are approximately equal and the voltage is constant. Now, consider the three-pointless state of the discharge lamp DL.0 Due to the repeated opening and closing operations of the switch means SWI, the bimetal BMu bends and contacts the contact C1, and the base current of the transistor Q1 is bypassed by the diode D1, so that one transistor Ql
is turned off. Therefore, another Zener diode ZDI is connected in series with the Zener diode ZDa. During the negative half cycle of the AC power supply VS, the voltage applied across H1 is mainly the Zener diode ZDI. Tiode 2
08. This is the sum of the Zener voltages of Zn2. Therefore, the heating of the main heater H1 is strengthened. The contact state between the contact C1 and the bimetal BM1 is maintained. For Zenataiode ZD
1. Since three of them, ZDl and ZD4, are connected in series, the voltage applied to Ha decreases by the Zener voltage of the Zener diode ZDI, and the heating of H3 weakens. , the curvature of bimetallic BM snow is reduced,
The switch means SWI is stable in the open state. In the case of the method shown in FIG.
This eliminates the need for a protective element such as a positive characteristic thermistor (PTC) to suppress the preheating current of the filament because it is stable in the open state. This is because a positive temperature coefficient thermistor (PTC) for limiting the preheating current is not required because the preheating current is interposed.

Next, FIG. 5 is a circuit diagram of yet another uninvented embodiment. In the previous embodiments, the contact C1 is in contact with the bimetal BMt which is thermally coupled to the main terminal H1, and is in a closed circuit state. In the example shown in FIG. 5, the contact point C1 is held.
This is an example of maintaining the repeated preheating operation of the discharge lamp DL in the three-pointless state by contact with the bimetallic BMl. It is connected to the connection point with the diode Dm. 2. When the discharge lamp DL becomes one or three starless state. The bimetallic BMl thermally coupled with the auxiliary -9Is also curves, and the bimetallic BM! The contact point C1 is in contact with the contact point C1 which is close to the contact point C1. At this time, in the positive half cycle of the AC power supply VS, the current is interrupted by the diode D3, so Ih continues to heat the contact C.
The closed circuit state between 1 and bimetal BM3 is maintained @ Also, in the negative half cycle of the AC power supply Vs, the current is bypassed by the diode Ds, so the main heater H1
No voltage is applied to the main heater H1, which stops heating.
Bimetal BM1 returns to original position/switch means SW
I is stable in the closed state O Thus the switch means SWI
When the circuit is closed, the current flowing in the positive half cycle is also bypassed by the diode D1, so that the current is suppressed due to the increase in resistance due to the heat generated by the positive temperature coefficient thermistor P1, and the protection state is entered. The difference between the unimplemented example and each of the above-mentioned examples is that the position of the contact point Ct does not depend on the position of the contact point Ct. ,? In the example, the switch means S
FIG. 6 shows another embodiment of the present invention, in which W l itself is closed and stable.
As in the case of the illustrated embodiment, the contact C1 is located close to the bimetal BMz at position 1. Also, when the discharge lamp DL is in an emitterless state, the main switch Sw1 is closed and stabilized. That is, in the unimplemented example, when the discharge lamp DL is emitterless, due to the curvature of the bimetal BMi,
The contact C1 and the bimetal BMg come into contact with each other at tP, and the Zener diode ZDx is short-circuited. For this purpose, the subsidy is −9T(t
The applied voltage increases and the heating becomes stronger. With this, Bimetal BM! The chasing motion for the bimetal BM1 becomes large, and the bimetal BM3 maintains an open circuit state with the contact C1 for a while, and then presses the bimetal BMI and contacts C1.
and bimetal BM1. The three parties in B come into contact and close the circuit,
The preheating current continues to flow through the filament of the discharge lamp DL via the diode D1. This filament preheating current is cut off by a positive temperature coefficient thermistor P1 in the same way as in the embodiment of FIG. 5.Furthermore, FIG. Figure 3 is an example in which the embodiment is applied to a multi-phase current limiting element Bs, Bi
・Positive characteristic thermistor Ps, Pν, Ta, I, t: □-do Di + Dl' % D mushroom, Dl', and noise prevention capacitors CN, CN', etc., for each discharge lamp DL, DL'. Although they are designed to be installed individually, the parts surrounded by the two-dot chain line S are shared, reducing the cost per lamp and making it possible to start multiple discharge lamps at once. It is.

〔Effect of the invention〕

The present invention is constructed as described above. Between the two non-power supply side terminals of the filament of the discharge lamp, a normally closed switch means made of two bimetals is connected, and the switch At least one bimetal heating heater is provided which is thermally coupled to at least one of the two bimetal sheets in the means and opens the switch means when the discharge lamp is started; When the switch means is repeatedly opened and closed when the discharge lamp fails to emit electrons, it contacts one of the curved bimetals to form a closed circuit and maintains the switch means in an open or closed state. and a contact for stopping the repeated preheating operation of the filament of the discharge lamp, the preheating current of the filament of the discharge lamp being energized through the closure formed by the contact between the at least one bimetal and the contact. Since it has a protective means such as a positive temperature coefficient thermistor that suppresses electron emission, the contact length of the switch means can be stabilized in an open or closed state in a relatively short period of time in the event of an electron emission failure of the discharge lamp. This has the effect of extending the life of the product. Also, it is equipped with a protective means such as a positive temperature coefficient thermistor that suppresses the preheating current flowing through the closed circuit formed by the contact between the bimetal and the contact. Inconveniences such as overheating of the current limiting element due to the preheating current can be prevented.

In addition, in the present invention, if the contact disposed close to one of the two bimetal sheets constituting the switch means is made of bimetal, an ambient temperature compensation function can be added. It is.

[Brief explanation of drawings]

FIG. 1(a) is a circuit diagram showing the basic configuration of the present invention, FIG. 1(b) is a circuit diagram of one embodiment of the same, and FIG. 1(C) is a circuit diagram of another embodiment of the same. Figure 2(a), Figure 2(b),
3 to 7 are circuit diagrams of different embodiments of the present invention. Vs is an AC power source bBl is a current limiting element, Hs is mainly -9, H
a is auxiliary -9, SWs is switch means・B M s
, BMx is a bimetal, C1 is a contact, Pl is a positive characteristic thermistor, and DL is a discharge lamp. Agent Patent Attorney Ishi 1) Chief Figure 1 (0)

Claims (1)

[Claims] (1) In a discharge lamp lighting device in which a commercial power source, an inductive current limiting element, and a discharge lamp with a preheating filament are connected in series, two terminals on the non-power supply side of the preheating filament terminals of the discharge lamp are connected. A discharge lamp starting device comprising a switch means that is normally closed and that, when starting the discharge lamp, conducts a current to preheat the filament of the discharge lamp for a certain period of time after turning on the commercial power supply, and opens after the same period of time has elapsed. In the device, the switch means is composed of two bimetals that are normally closed, and the at least one bimetal is thermally coupled to at least one of the two bimetals and opens the switch means when the discharge lamp is started. It is used for heating and is placed close to one of the two bimetals.
When the switch means repeatedly opens and closes when the discharge lamp fails to emit electrons, it comes into contact with one of the curved bimetals to form a closed circuit, and the switch means is kept in an open state or an open state, and the filament of the discharge lamp has a contact QAt that stops the repetition of the preheating operation of the at least one bimetal, and a closed w! formed by the contact between the at least one bimetal and the contact. Discharge lamp, starting and operating device, characterized in that it comprises protective means, such as a positive temperature coefficient thermistor, for suppressing the preheating current of the filament of the discharge lamp, which is energized through the discharge lamp.