JPS6226790A - Pulse generation switch with discharge lamp lighting protection circuit - 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 (a) Industrial Application Field The present invention relates to a switch for generating pulses used in an instantaneous automatic lighting circuit for a discharge lamp, and more specifically to protection in the event of an abnormality in which a discharge lamp deteriorates and does not turn on. The present invention relates to a switch equipped with a circuit.

(b) Prior Art Conventional instantaneous lighting devices for discharge lamps include those that use leakage transformers, and various electronic starting devices that utilize the dynamic characteristics of two-terminal bidirectional xyristors such as SSS have been proposed. However, it required a special ballast, the circuit was complex, and pulse trasis was required.

Therefore, JP-A-59-205195, JP-A-59-20
．． Publication No. 5196 discloses a relay (hereinafter referred to as a hot wire relay) that opens and closes by moving the contacts by heating the resistance wire when a current flows through it and elongating the resistance wire due to thermal expansion, and a choke coil and a choke coil. A diode is used to generate a high-voltage pulse, and an electromagnetic relay is used to limit the operation of the hot-wire relay contact to only one time, lighting the discharge lamp with a single pulse, and activating the hot-wire relay after the discharge lamp is lit. A discharge lamp lighting circuit has been proposed that prevents this from occurring.

Further, the present inventor has disclosed in Japanese Patent Application No. 58-126584 that a diode (2) is connected in parallel to the hot wire relay [1] as shown in FIG.
), and a cocidizer (3) are connected, and a ballast (4) consisting of a choke coil is connected in series to generate a high-voltage pulse, and after the discharge lamp is lit, a cytac (5) is connected.
In addition to blocking current to this pulse generation circuit,
A lighting circuit has been disclosed which protects the hot wire relay by heating the bimetal (6) and opening the contact (7) by repeating the arc of opening and closing the contacts of the hot wire relay f+l in the event of an abnormality in which the discharge lamp does not light up.

(C) The problem to be solved by the invention
The discharge lamp lighting circuits disclosed in No. 9-205195 and Japanese Patent Application Laid-open No. 59-205196 use a delayed one-no circuit with a kind of self-holding circuit. It is difficult to select and adjust the operating characteristics of the hot wire υ-, and the structure becomes complicated.

In the lighting circuit disclosed in Japanese Patent Application No. 58-126584, a hot wire relay operates multiple times to generate multiple pulses until the discharge lamp lights up, and a protection circuit using bimetal is used in the event of an abnormality in which the discharge lamp cannot be lit due to deterioration. This is designed to prevent burnout due to continuous operation of the hot wire relay, but the bimetal (6) is heated and bent by the arc of the hot wire relay contact, causing the contact (7) to open and the hot wire relay stops operating. However, after some time has passed, the bimetal cools down and the contact (7) returns, and the hot wire relay starts operating again.
The disadvantage is that these operations are repeated.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the inventor of the present invention has conducted extensive research, and as a result, we have developed relays such as hot-wire relays or electromagnetic relays, and bimetallic relays that are activated by arc heat at the contacts of the relays. In addition to combining a protection circuit using a switch, a small-capacity electrothermal resistor is placed close to the bimetal to prevent the bimetal switch from returning once activated, thereby keeping the bimetal switch warm and in operation. Keep the bimetallic switch in the operating state until the cause of the abnormal lighting is removed.
By discovering that it is possible to protect relays, and by integrating these relays, bimetallic switches, and electrothermal resistors into a small case, we have made the switch for generating discharge lamp pulses used in instantaneous lighting circuits small and inexpensive. The present invention has been completed based on the discovery that the present invention can be configured as follows.

That is, the present invention fixes the fixed contacts of a hot wire relay or the fixed contacts of an electromagnetic relay, which open and close the contacts by moving the contacts by thermal expansion caused by current heating of the resistance wire, to the fixed end of the bimetal of the bimetal switch, and also closes the contacts to the bimetal. The subject matter is a switch for generating discharge lamp lighting pulses, characterized in that an electrothermal resistor is arranged.

Next, the present invention will be explained in detail with reference to the drawings. FIG. 1 is a front view of an example of the switch of the present invention, and FIG. 3 is an example of a circuit diagram of a lighting circuit for a discharge lamp using the same switch.

In Fig. 1, (8) is a switch case, and one end of a leaf spring (9) made of phosphor bronze or the like is located inside the case as a fulcrum (lO
), and the other end is the movable contact (11) of the hot wire relay.
) is fixed at a position facing the fixed point (1).The leaf spring (9) is biased in a direction in which the movable contact (11) is separated from the fixed contact (12+).(13) is a thin electric heating resistor. One end of the wire is fixed to a movable contact (near the river) and the other end is fixed to the movable contact (9) when the electric heating resistance wire is cooled, so that the wire contacts the fixed contact (1 匈). Leaf spring (
9) and the hot wire terminal (fixed to the case (8)).
14). Resistance line (13) is 0.001 to several I
A nichrome wire or the like having a resistance of CIQ and a diameter of 0.05 to 0.3 wire is used, preferably a resistance wire of 60 Ω/m or less.

The fixed contact of the hot wire relay (1) is fixed to the fixed end of the bimetal (6) of the bimetal switch, and the bimetal (
6) The movable end (in some countries, the fixed contact of a bimetal switch (
A movable contact (18) is provided at a position facing Ino. An electrothermal resistor (19) is arranged near the bimetal (6), and one end of the electric heating resistor (19) is connected to the fixed contact (17) of the bimetal switch.
) to the fixed contact terminal (a), and the other end to the resistance terminal (21). FIG. 4 shows another embodiment of the switch according to the invention, which is similar to that of FIG. 1 but further provided with a bimetallic terminal (3) connected to a bimetallic terminal (6).

The above-mentioned components are arranged in a small case (8) and are integrally configured as a 3-terminal or 4-terminal switch.

FIG. 5 shows a switch circuit using an electromagnetic relay instead of the hot wire relay of the above switch, and (b) is an electromagnetic coil with an iron core, and a movable piece (24) equipped with a movable contact (11). The fixed contact (11) provided at one end of the movable contact (11) and the bimetal (6) is
I2 is now closed.

(e) Function Next, a lighting circuit for a discharge lamp using the switch of the present invention will be explained.◇In Fig. 6, (A) is the pulse generation switch of the present invention, and (A) is the filamentous preheating type. It is a discharge lamp with a filament (b) and a kiln at both ends. One end of the AC power source 4 is connected to the pulse generating switch of the present invention (2 yen resistance terminal (21)) via the ballast 14) and one filament sheet. Furthermore, between the resistance terminal (21) and the hot wire terminal (I4) Connect a diode and a rectifier in parallel, and then connect this in series with the Cytac.The contact terminal □□□ is connected to the other end of the power supply via the other filament of the discharge lamp.The breakdown voltage of the Cytac ■Select T30 higher than the peak value of the terminal voltage when lighting the discharge lamp and lower than the peak value of the power supply voltage.In addition, (30)
is a zabo koshijishisa.

When the circuit is configured in this way and current is passed through, the ballast (4)
, Firameshito cutting power, Cytac (5), Taiode (
2), resistance wire (13), normally closed contact (!■), (12
1. Bimetal (6), normally closed contacts (17), (18)
), a half-wave current flows through the filament. resistance line 0
The resistance wire (13) is heated by the current flowing through the resistance wire (13), and the resistance wire (I3) expands and stretches, and the contacts (11) and (1) open after a certain period of time due to the elasticity of the leaf spring (9). At this time, the discharge lamp is immediately turned on by the pulse induced in the coil of the ballast (4).Since the preheating current of the filament sheet flows in only one direction due to the diode, the ballast (4) is heated by the DC component flowing to the ballast. When it is saturated, the preheating current of the filler metal increases and it is preheated in a short time.
As shown in No. 9-295195, lighting is ensured no matter which phase of the half-wave current the contacts (11) and (12) open. Once the discharge lamp is lit, the terminal voltage of the discharge lamp decreases and becomes below the VBO of the Cytac, so the pulse generation circuit no longer operates. If the discharge lamp deteriorates and does not light up with a single pulse, the resistance wire (13) will heat up and open the contacts (11) and (12), and no current will flow through the resistance wire (13). It is adiabatically cooled, contracts, and pulls together the contact (!I) and closes the contact (!I).Then, current flows through the resistance wire 01 again, and the above operation is repeated again.

If the light does not light up even after generating pulses many times, the contact (
11), (1) Due to the arc when opening the contact (12I
, the bimetal (6) is heated, the bimetal (6) is bent, the contact (10, (country) is opened, and the generation of pulses stops. Furthermore, the small current flowing through the electrothermal resistor (19) causes the resistor (I9) to is heated, the bimetal (6) adjacent to it is kept warm, and the contacts Oη, (l→ are kept open. Once the power is turned off and the degraded discharge lamp is replaced, the bimetal (6) cools down during that time. Contacts (17) and (181) automatically return to normal operation, and the pulse generation circuit begins to operate.

Note that the diode (2) is exactly the same even if it is oriented in the opposite direction as shown in the figure.

FIG. 6 shows a lighting circuit using the four-terminal switch shown in FIG. 4 of the present invention. In this case, in FIG. Furthermore, a diode (2) and a stiffener (3) are connected in parallel between the hot wire terminal 04) and the bimetal terminal.

Similar to the circuit shown in Fig. 3, in this circuit, a high voltage pulse is generated when the contacts (11) and (12) of the hot wire relay ft) are opened, but the light does not turn on with one pulse, and when the pulse is repeated several times, While the contacts (11) and (12+) are open, the filament is rapidly heated by the half-wave current flowing through the diode (2), leading to lighting.The operation of the protection circuit when the discharge lamp deteriorates using the bimetal switch is as follows. The circuit is exactly the same as the circuit shown in FIG.

FIG. 7 shows an example of a lighting circuit using an embodiment of the switch of the present invention using the electromagnetic relay shown in FIG.
Its operation is similar to the circuit using the hot wire relay shown in Fig. 6, and when the electromagnetic coil (23) is energized, the contact (II)
(121 closes and current no longer flows through the electromagnetic coil, so the contacts (11) and (12) open again. At this time, a high voltage pulse is generated. While the pulse is generated several times, the filament sheet (28) heats up. The discharge begins.

Furthermore, the switch circuit shown in FIG. 5 may be used in the circuit shown in FIG. 3, and an electromagnetic relay may be used instead of the hot wire relay (1).

FIG. 8 shows another embodiment of a lighting circuit using the switch of the present invention. The circuit shown in Fig. 8 is the same as the lighting circuit shown in Fig. 3 except that an electromagnetic relay nose having a normally closed contact 43) 1 is provided in place of the sight tag (5). ), hot wire relay contacts (11), (+21) and bimetal switch contacts θη, (18) are closed, no current flows through the coil (3 (support)) of electromagnetic relay 02, so the normally closed contact ( 3)) remains closed. When the hot wire relay operates and contacts (11) and (121) open, a pulse is generated and the discharge lamp lights up, at the same time the coil (3)
3), the normally closed contact (3) opens, and even if the resistance wire (I3) of the hot wire relay (1) cools down and the hot wire relay contacts (11) and (I2) return to normal and close, Normally closed contact (
3)) is held open, so the hot wire relay (1) no longer operates and generates a pulse. Also, even if the discharge lamp does not light up with the first pulse, the normally closed contact (3) opens at the same time as the pulse and remains in that state, so even if the discharge lamp has deteriorated, the lighting operation will be repeated. There is no problem, and safety is doubled with the protection circuit using the bimetal switch.

(f) Effects According to the switch for generating discharge lamp lighting pulses of the present invention, the discharge lamp can be reliably turned on instantaneously, and if the discharge lamp has deteriorated and does not turn on, the lighting operation can be repeated as many times as necessary. A protection circuit using a bimetal and a heat-retaining resistor stops the lighting operation, so the switch contacts will not be damaged.

The circuit configuration is extremely simple, and by integrating a hot wire relay or electromagnetic relay, bimetal, and heat-insulating electric heating resistor into the case, stable operation can be ensured, and discharge lamps can be easily installed. It has the effect of being able to be incorporated into lighting equipment.

[Brief explanation of drawings]

Fig. 1 is a front view of an example of a pulse generation switch with a discharge lamp lighting protection circuit according to the present invention, Fig. 2 is a conventional discharge lamp lighting circuit diagram, and Fig. 3 is a discharge lamp lighting circuit using the switch of the present invention. An example diagram, FIGS. 4 and 5 are diagrams showing other embodiments of the switch of the present invention, and FIGS. 6, 7, and 8 are diagrams showing other embodiments of a lighting circuit using the switch of the present invention. FIG. 2 is a circuit diagram showing an example. (11...Hot wire relay (2)...Taio °-
(3)...Cosidedecisor (4)...Stabilizer (6)
... Cytac (61... Bimetal (7)
...Contact [8] ...Switch case (9)...
Leaf spring (10)...Fully point (11)...Movable contact - (12)...Fixed contact θ turbidity...Electrical resistance wire (14)...Hot wire terminal θ position...1 fixed end
(16)...Movable end (lη...Fixed contact
(18)...Movable contact H...Electrothermal resistor
(20)...Contact terminal C toe/resistance terminal (
22... Bilateral terminal... Electromagnetic coil (
24)...Movable piece (to)...Pulse generation switch (A)...Discharge lamp (27!, Furameshito (A)...AC power supply (30)...
Noise prevention cosidedecisor (3))...Normally closed contact (3
2)...Electromagnetic Relay Princess...Coil.

Claims (4)

[Claims] (1) The fixed contacts of a hot wire relay or electromagnetic relay, which opens and closes the contacts by moving the contacts due to thermal expansion caused by current heating of the resistance wire, are fixed to the fixed end of the bimetal of the bimetal switch, and are placed in close proximity to the bimetal. A pulse generation switch with a discharge lamp lighting protection circuit, characterized by the arrangement of an electric heating resistor for bimetal heat retention. (2) The hot wire relay has a movable contact at one end of the leaf spring,
The movable contact urges the leaf spring in a direction away from a fixed contact fixed to one end of the bimetal, and one end of the leaf spring is fixed near the movable contact, and at room temperature, the leaf spring is pulled to close both contacts. The pulse generation switch with a discharge lamp lighting protection circuit according to claim 1, which is a hot wire relay equipped with a thin electric heating resistance wire that closes. (3) A pulse generation switch with a discharge lamp lighting protection circuit according to claim 1 or 2, wherein the hot wire relay or electromagnetic relay, the bimetallic switch, and the electrothermal resistor are integrally mounted in a case. (4) The hot wire terminal connected to the resistance wire in the case, the contact terminal connected to the fixed contact of the bimetal switch and one end of the electric heating resistor, and the resistance terminal connected to the other end of the electric heating resistor can be connected to the outside. Claim No. 3 provided in
Pulse generation switch with discharge lamp lighting protection circuit.