JPH09126454A - Igniter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the size of circuit components to the minimum, secure the miniaturization, and further produce larger secondary output voltage. SOLUTION: This igniter includes a transformer 60 a primary side of which is connected with a commercial power supply 10, and an electric discharge gap 70 provided on a secondary side of the transformer 60. In the igniter, one end of the primary side of the transformer 60 is connected with one end of the commercial power supply 10 through a diode 34, and the other end of the primary side of the transformer 60 is connected with the other end of the commercial power supply 10 through a capacitor 50. Further, an anode of a phototriac 80 and T1 are connected with a connection part of the diode 34 and the transformer 60. A cathode of the phototriac 80 is connected between the commercial power supply 10 and the diode 34. T2 of the phototriac 80 is connected with a connection part of the capacitor 50 and the commercial power supply 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an igniter which uses a commercial power source as a power source and discharges in synchronization with the cycle of the power source.

[0002]

2. Description of the Related Art A circuit diagram of a conventional igniter is shown in FIG. In FIG. 2, the anode of the diode 34 is connected to one end of the commercial power supply 10 via the resistor 20, and the cathode is connected to the anode of the thyristor 40 and one end of the transformer 60 on the primary side. The other end is connected to the anode of the diode 30 through the capacitor 50, and the cathode is connected to the other end of the commercial power supply. The cathode of the thyristor 40 is connected between the capacitor 50 and the diode 30, and the gate thereof is connected to the anode of the diode 30 via the resistor 24 and to the cathode of the diode 30 via the resistor 22, respectively. The cathode of the diode 32 is connected between the resistor 20 and the diode 34, and the anode of the diode 32 is connected to the anode of the diode 30. A discharge gap 70 is provided on the secondary side of the transformer.

Next, the operation of the circuit having the above configuration will be described. When one end of the commercial power supply 10 is positive and the other end is negative, the other end of the commercial power supply 10 passes from one end of the commercial power supply 10 through the resistor 20, the diode 34, the primary coil of the transformer 60, the capacitor 50, and the diode 30. The current flows through the capacitor 50, so that the capacitor 50 is charged.

Contrary to the above, when the other end of the commercial power supply 10 is positive and the other end is negative, the other end of the commercial power supply 10 passes through the resistor 22, the gate of the thyristor 40 through the cathode, and the diode 32,
A current flows through the resistor 20 and returns to one end of the commercial power supply 10. This current triggers the gate of the thyristor 40 to bring the anode and cathode of the thyristor 40 into conduction. As a result, the electric charge charged in the capacitor 50 flows as a rapid current to the primary coil of the transformer 60. A pulse voltage is generated in the primary coil of the transformer 60 by this current. This pulse voltage is boosted by the transformer 60 and the discharge gap 70
Is discharged.

[0005]

In the circuit having the above configuration, the thyristor 40 is used as the main driving element. As is well known, the thyristor 40 has a polarity and the reverse current cannot flow due to the resonance of the transformer 60 and the capacitor 50.
34 is needed. For this reason, unnecessary circuit components are required for the original circuit operation, and miniaturization of the circuit itself cannot be realized.

The secondary output voltage value of the transformer 60 is proportional to the amount of change in current. Here, if the reverse current cannot flow, the current changes only from the positive peak to zero, so the secondary output voltage value is smaller than that of the reverse current flow.

In view of the above problems, it is an object of the present invention to provide an igniter which can minimize the number of circuit constituent elements, can be downsized, and can generate a larger secondary output voltage value.

[0008]

In order to solve the above problems, according to the present invention, there is provided an igniter having a transformer 60 for connecting a primary side connected to a commercial power source 10 and a discharge gap 70 on a secondary side of the transformer 60. , The primary side of the transformer 60 is connected to one end of the commercial power source 10 via the diode 34, and the other end of the commercial power source 10 is connected to the other end of the commercial power source 10 via the capacitor 50. The anode of the phototriac 80 and the T1 are connected to the connection portion of the phototriac 80, and the cathode of the phototriac 80 is connected between the commercial power source 10 and the diode 34.
Is an igniter characterized in that it is connected to the connection portion between the capacitor 50 and the commercial power source 10, respectively.

[0009]

1 is a circuit diagram of an igniter according to the present invention. In FIG. 1, the anode of the diode 34 and one end of the resistor 82 are connected to one end of the commercial power supply 10 via the resistor 20,
The cathode of the diode 34 is connected to one end of the transformer 60 on the primary side. The other end is connected to the other end of the commercial power supply 10 via a capacitor 50. The diode 34
The cathode of is also connected to the anode of the phototriac 80 and T1, respectively. This cathode is connected to the other end of the resistor 82, and T2 is connected to the connecting portion between the capacitor 50 and the commercial power source 10. A discharge gap 70 is provided on the secondary side of the transformer.

Next, the operation of the circuit having the above configuration will be described. When one end of the commercial power supply 10 is positive and the other end is negative, a current flows from one end of the commercial power supply 10 to the other end of the commercial power supply 10 through the resistor 20, the diode 34, the primary coil of the transformer 60, and the capacitor 50. As a result, the capacitor 50 is charged.

Contrary to the above, when the other end of the commercial power source 10 is positive and this one end is negative, the capacitor 50,
A current flows to one end of the commercial power supply 10 through the primary coil of the transformer 60, the anode-cathode of the phototriac 80, the resistor 82, and the resistor 20. This current triggers the phototriac 80 to bring the T1-T2 of the phototriac 80 into a conductive state. At this time, a rapid current flows in the primary coil of the transformer 60 due to the electric charge charged in the capacitor 50, and a pulse voltage is generated in the primary coil of the transformer 60 by this current. This pulse voltage is boosted by the transformer 60, and discharge is generated in the discharge gap 70.

[0012]

According to the above structure, the diodes 30 and 32 and the resistor 24 are unnecessary, the number of elements can be reduced as compared with the conventional circuit, and the circuit structure of the wiring board can be miniaturized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an igniter according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a conventional igniter.

[Explanation of symbols]

 In the drawings, the same reference numerals indicate the same or corresponding parts. 10 Commercial power supply 60 Transformer 80 Phototriac

Claims (1)

[Claims] 1. An igniter having a transformer for connecting a primary side to a commercial power source and a discharge gap on a secondary side of the transformer, wherein the transformer is connected to one end of the primary side of the transformer via a diode at one end of the commercial power source. , The other end of this phototriac is connected to the other end of the commercial power supply via a capacitor, and the anode of the phototriac and T1 are connected to the connection part between the diode and the transformer, and the cathode of this phototriac is connected to the commercial power supply and the diode. An igniter that is connected between the two and the T2 of the phototriac is connected to the connection between the capacitor and the commercial power source.