JPH1031981A - Metal vapor discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely stop the generation of pulse voltage when a lamp is not lighted by interposing a conductive member for interrupting heat transfer in series to the heating resistance of a nonlinear ferroelectric ceramic capacitor on the opposite side thereto. SOLUTION: This metal vapor discharge lamp has a conductive member 19 such as tungsten coil interposed in series to the heating resistance 18 of a nonlinear ferroelectric ceramic capacitor (FEC) 14 on the opposite side to the FEC 14. The heat generated in the resistance 18 is efficiently transferred to the FEC to heat it to the Curie temperature or more, whereby generation of pulse voltage for starting can be surely stopped. Consequently, the absorption of the generated pulse voltage is minimized by the use of the resistance 18 having a proper resistance value, whereby the lamp is easily started. Namely, even in a lamp having a power source of 100V class, generation of pulse voltage in non-lighting of the lamp can be surely stopped without reducing the resistance value of the resistance 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a starting circuit for a metal vapor discharge lamp such as a high-pressure sodium lamp.

[0002]

2. Description of the Related Art Among high-pressure sodium lamps having a non-linear ferroelectric ceramic capacitor (hereinafter referred to as FEC) as an element of an in-lamp starter, a function of stopping generation of a pulse voltage for starting when a lamp is in a failure (pulse stop) The lamp having the function (1) is a circuit configuration diagram as shown in FIG. In the figure, 1 is an arc tube, 2 is an external auxiliary conductor, 3 is a bimetal switch, 4 is FEC, 5 is a semiconductor switch, 6
Is a resistor for stabilizing the phase in which the pulse is generated, 7 is a pyroelectric current bypass resistor also serving as an FEC heating resistor, and 8 is a current control resistor for preventing a large current from flowing through the circuit when it is damaged.

(Role of resistor) In FIG. 2, a resistor 7 is
An action to bypass the pyroelectric current (pyroelectric current bypass) and an action to stop the generation of the pulse by heating the FEC temperature to the Curie temperature or more when the lamp is out of sight (pulse stop function)
And have Here, the pyroelectric current is a current generated when the temperature of the FEC 4 exceeds the Curie temperature of the FEC. Actually, when the temperature inside the lamp rises after the lamp starts and the bimetal switch 3 is open, the FEC
It flows on the circuit of 4-resistance 7-resistance 6-resistance 8.

[0004] The FEC 4 is heated by mainly conducting the heat of the resistor 7 by conduction. The resistance value of the resistor 7 must heat the FEC above its Curie temperature (about 90 ° C.) in order to stop the generated pulse when the lamp fails. 3 when ballast secondary voltage is 200V class
It is about 0 to 100 kΩ.

(Absorption of Generated Pulse Voltage by Resistor) The resistor 7 has a function of absorbing the generated pulse voltage in addition to the pyroelectric current bypass and the pulse stop function.
The lower the resistance value, the greater the action of absorbing the pulse voltage.

The circuit of FIG. 2 is normally fully functional,
There is no problem at the time of starting the lamp, restarting the lamp, and at the time of lamp abnormality. Here, the time when the lamp is abnormal is a case of outer bulb leakage, arc tube leakage, or the like. In other words, at the time of starting the lamp and restarting the lamp, the lamp is surely turned on,
When the lamp does not start for some reason, the generated pulse is stopped, and in the case of an outer sphere leak, an arc tube leak or the like, the generated pulse can be stopped by self-destruction.

[0007]

[Problems to be solved by the invention]

(Problems in the 100V class) However, when the power supply (secondary voltage of the ballast) for lighting the lamp is 100V class, the lamp is surely turned on when the lamp is started and when the lamp is restarted. When the lamp does not start, it is difficult to select the resistance value of the resistor 7 in order to surely stop the generated pulse voltage.

(Reason for the problem in the 100V class) This is due to the following reason. Although the pulse stop function is realized by causing the resistor 7 to generate heat, the resistance value of the resistor 7 in the 100 V class must be set lower than that in the 200 V class in order to secure the heat generation amount.
However, when the resistance value decreases, the absorption of the generated pulse voltage by the resistor 7 increases, and as a result, the generated pulse voltage decreases. Therefore, the lamp is difficult to start.

The present invention has been made in view of the above, and the present invention is applied to the case where the power source for lighting the lamp is 100 V class.
Without making the resistance of the EC heating resistor too low,
An object of the present invention is to provide a metal vapor discharge lamp capable of surely stopping generation of a pulse voltage when a lamp is out of order and having a function of stopping generation of a pulse voltage when a lamp is out of order.

[0010]

In order to achieve the above object, a non-linear ferroelectric ceramic capacitor is provided as an element of a starter with a built-in lamp, and a heating resistor is connected in parallel with the capacitor when the lamp is not in a spot. By heating above the Curie temperature, it has the function of stopping the generation of a pulse voltage for starting, and conducting heat in series with the capacitor heating resistor and on the opposite side to the capacitor to block heat conduction. By interposing a conductive member, the ceramic capacitor is efficiently heated to ensure that the pulse is stopped.

[0011]

According to the above construction, the heat generated by the FEC heating resistor is efficiently transmitted to the FEC without escaping to the other and heats it, so that the generated pulse voltage can be surely stopped. In addition, as a result, since the FEC heating resistor having an appropriate resistance value can be employed, absorption of the generated pulse voltage is small, and the lamp can be easily started. As a result, the heat generated by the FEC heating resistor efficiently
Can be heated, the generated pulse voltage is reliably stopped, and an FEC heating resistor having an appropriate resistance value can be employed, so that the lamp can be easily started.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 11 denotes an arc tube made of translucent alumina, and electrodes are sealed at both ends. An external auxiliary conductor 12 is attached to the outer periphery of such an arc tube. or,
A series circuit including a bimetal switch 13, a non-linear ferroelectric ceramic capacitor (FEC) 14, a conductor switch 15, and a current control resistor 16 for preventing a large current from flowing through the circuit when the FEC is damaged is arranged in parallel with the arc tube 11. It is connected. Further, a resistor 17 for stabilizing the phase of a pulse generated in parallel with the semiconductor switch 15 is connected. Furthermore, a series circuit of an FEC heating resistor 18 as a heating element for heating the FEC in parallel with the FEC 14 and a conductive member 19 for interrupting heat conduction on the opposite side to the FEC 14 are connected. .

Next, an experimental example will be described. A high-pressure sodium lamp of 100 V class (40 to 50 W) composed of the resistance value for FEC heating and the presence or absence of a conductive member as shown in Table 1 was prototyped, and its starting characteristics and pulse stop time were investigated. The conductive member is a tungsten coil (MG = 18.4, coil length = 10 mm)
It was used. Table 1 shows the results. (Hereinafter, margin)

[0014]

[Table 1]

As is apparent from Table 1, the lamp according to the present invention has good starting characteristics and a pulse stop time of 2 hours.
Good within minutes. This is because the conductive member is interposed to cut off the heat conduction of the FEC heating resistor, so the heat generated by the FEC heating resistor is efficiently transmitted to the FEC without escaping to other parts, and the generated pulse is transmitted. It can be stopped reliably.

[0016]

As described above, in the metal vapor discharge lamp according to the present invention, since the conductive member is inserted in series with the FEC heating resistor and on the opposite side to the FEC, the generated heat is less efficient. The pulse is transmitted to the FEC, and the generated pulse can be reliably stopped. As a result, the FEC with the appropriate resistance value
Since a heating resistor can be employed and the generated pulse voltage is less absorbed, the lamp is easier to start. And
Even if the power supply is a 100V class lamp, the function to stop the generation of the pulse voltage when the lamp is out of order without stopping the resistance value of the FEC heating resistor, and to stop the generation of the pulse voltage when the lamp is out of order Is obtained.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a high-pressure sodium lamp according to one embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a conventional high-pressure sodium lamp.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Arc tube 12 External auxiliary conductor 13 Bimetal switch (thermal response switch) 14 Nonlinear ferroelectric ceramic capacitor 15 Semiconductor switch 16 Resistance for stabilizing the phase which generates a pulse 17 Pyrocurrent bypass resistance which also serves as FEC heating resistance 18 FEC damage A current control resistor that prevents a large current from flowing in the circuit at times.

Claims (1)

[Claims] 1. A starting device comprising a non-linear ferroelectric ceramic capacitor as an element of a starter with a built-in lamp, and when the lamp is at a point of failure, heating by a heating resistor connected in parallel with the capacitor to a temperature higher than its Curie temperature. In a discharge lamp having a function of stopping generation of a pulse voltage for, in series with the capacitor heating resistor, and by interposing a conductive member for blocking heat conduction on the opposite side of the capacitor, the A metal vapor discharge lamp characterized in that a ceramic condenser is efficiently heated to ensure a pulse stop.