JPS5845518Y2 - Ignition device for combustion appliances - Google Patents

Description

[Detailed explanation of the idea] This proposal relates to an ignition device for a combustion appliance.

Conventionally, this type of ignition device is as shown in Figure 1.
AC power supply 10, capacitor 2, pulse transformer 3 on both ends
A primary winding, a series circuit of a three-pole bidirectional thyristor 4, and a series circuit of a resistor 5 and a resistor 6 are connected in parallel, and the connection point between the resistor 5 and the resistor 6 is connected to the three-pole bidirectional thyristor. 4 gates have been proposed.

In this case, by setting the resistor 5.6 so as to conduct the three-pole bidirectional thyristor 4 slightly before the AC supply voltage reaches its half-cycle maximum value, as shown in FIG. 2a. , a voltage as shown in Fig. 2 is applied to the series circuit of the capacitor 2 and the primary winding of the pulse transformer 3, and a pulse-like voltage as shown in Fig. 2C is applied to the secondary winding of the pulse transformer 3. It is configured to occur at a frequency corresponding to the time constants of the capacitor 2 and pulse transformer 3.

However, the discharge energy Q from the capacitor
is the terminal voltage of the capacitor, and the capacitance of the capacitor is C.
Then, since Q-=CV2, an expensive and large capacitor is required to obtain high discharge energy.
Inevitably, the entire ignition system had the disadvantage of being bulky.

The object of the present invention is to provide an ignition device for a combustion appliance that eliminates the drawbacks of conventional ignition devices, increases discharge energy, prevents the device from becoming large, and allows for a low-profile design.

The main proposal will be explained in detail below along with the drawings.

FIG. 3 shows an embodiment of the ignition device for combustion appliances of the present invention, in which a series circuit of a capacitor 12, a primary winding of a pulse transformer 13, and a three-pole bidirectional thyristor 14 is connected to both terminals of an AC power source 11. A series circuit of a resistor 15 and a capacitor 16 is connected in parallel to the above series circuit.

Further, a connection point P between the resistor 15 and the capacitor 16 is connected to the gate of the three-pole bidirectional thyristor 14 via a bi-directional diode 17, and the gate of the three-pole bidirectional thyristor 14 and the three-pole A resistor 18 is connected between the bidirectional thyrisk 14 and the connection point of the primary winding of the pulse transformer 13.
, and a series circuit of diodes 19 are connected.

20 is a discharge gap provided on the secondary winding side of the pulse transformer 13.

Furthermore, the operation of the present invention will be explained in detail.

The ignition device of the present invention is characterized in that the three-pole bidirectional thyristor 14 is ignited through different paths in each positive and negative half cycle of the AC power source 11.
8. Three-pole bidirectional thyristor 1 via diode 19
Fire the gate of 4 directly and resistor 15 in the positive half cycle.
, and a capacitor 16 in series to provide an appropriate delay, and then ignition occurs via a bidirectional diode 17.

Here, the tripolar bidirectionality 92 in the negative half cycle
2140 ignition is to charge the capacitor 12 almost to the peak value of the AC power supply 110, and to ignite the three-pole bidirectional thyristor 14 at a low voltage at the rising edge of the negative half cycle, the resistor 18 is set to a relatively small value. selected.

Also, the tripolar bidirectional rhino 922 in the positive half cycle
140 ignition is to generate a high-voltage pulse to ignite, so each constant is set so that the trigger is activated near the maximum value of the power supply voltage (around 90 degrees in phase) due to the delay effect of the resistor 15 and capacitor 16. is selected.

Generally, since the capacitor 16 has a medium capacity t, the inflow current is small, so a relationship between resistors 15 and 18 occurs, but this is not the gist of the present invention.

Next, to explain the operation in each half cycle, in the negative half cycle of the AC power supply 11, that is, the half cycle in which the capacitor 12 side becomes negative, the resistor 18 is selected to have a small value as described above. , three-pole bidirectional thyristor 1
The gate of No. 4 is triggered in the negative mode by the path of diode 19 → resistor 18 → primary winding of pulse transformer 13 → capacitor 12 → AC power supply 11, and is fired at a conduction angle near zero degree of the power supply voltage.

Therefore, the capacitor 12 is connected to the three-pole bidirectional thyristor 14.
, through the primary winding of the pulse transformer 13, the winding side is charged to almost the peak value of the AC power supply 11.

Note that as charging progresses, the diode 19 becomes cut-off, and the charging current decreases due to the sinusoidal drop in power supply voltage and the completion of charging, and when it reaches the holding current of the three-pole bidirectional thyristor 14, the diode 19 cuts off. 14 is turned off and is not fired until the next half cycle, so the charging voltage on capacitor 12 remains constant until the next cycle.

Then, when the voltage of the AC power source 11 enters a positive half cycle, the series circuit of the resistor 1'8 and the diode 19 is in an open state due to the polarity discrimination action of the diode 19, and the three-pole bidirectional thyristor 14 is triggered at the conduction angle where the maximum oscillating voltage is obtained due to the time constant of the resistor 15 and capacitor 16.

The voltage waveforms of each part of the button for the above operation are shown in Figure 4, where a is the voltage waveform of the AC power supply 11, and b is the voltage waveform of the AC power source 11.
indicates the terminal voltage of the capacitor 12, the broken line section of C indicates the voltage applied across the series circuit of the primary winding of the pulse transformer 13 and the bipolar bidirectional thyristor 14, and the solid line section indicates the voltage applied to the primary winding.

Therefore, a voltage approximately twice the peak value of the AC power source 110 is applied to the primary winding of the pulse transformer 13, and the maximum amplitude of the capacitor 12 reaches approximately twice the peak value of the AC power source 110 during vibration.

In other words, since the discharge energy Q from the capacitor 12 is proportional to the square of the terminal voltage, the discharge energy Q quadruples as the terminal voltage doubles.

Conversely, if the discharge energy Q is the same as that of the conventional product, the capacitor capacity can be reduced to 1/4 of that of the conventional product.

According to the igniter for a combustion appliance of the present invention configured as described above, the discharge energy can be reduced, and the ignition device can achieve remarkable effects such as being able to achieve miniaturization and the ability to have a low floor.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional ignition device, FIG.
FIGS. 4a to 4c are the same waveform diagrams. 11... AC power supply, 12... Capacitor, 13... Pulse transformer, 14...
・Three-pole bidirectional thyristor, 15... Resistor, 1
6... Capacitor, 17... Bidirectional diode, 18... Resistor, 19...
Diode, 20...discharge gap.

Claims (1)

[Scope of utility model registration request] A series circuit of a capacitor 12, the primary winding of a pulse transformer 13, and a three-pole bidirectional thyristor 14 is connected to both terminals of the AC power supply 11, and a series circuit of a resistor 15 and a capacitor 16 is connected in parallel to the series circuit. and connect the connection point of the resistor 15 and capacitor 16 to the three-pole bidirectional thyristor 1.
A bidirectional diode 17 is connected between the gate of 4 and
and the gate of the three-pole bidirectional thyristor 14 and the three-pole bidirectional thyristor 14 of the pulse transformer 13.
An ignition device for a combustion appliance comprising a series circuit of a resistor 18 and a diode 19 connected between the connection points.