JPS5921920A - Controller of burning device - Google Patents

Abstract

PURPOSE:To improve reliability, by a method wherein, through utilization of a voltage generated at a pulse transformer for driving an electromagnetic valve, an ignitor is actuated to perform flickering of a combustion display lamp through utilization of the current of the ignitor. CONSTITUTION:When gas is fed to a burner, a high voltage, being as high as hundred and several tens V, is generated at a pulse transformer 29, and a capacitor 24 is charged up through a resistor 28, a combustion lamp 27, and a diode 26. When the voltage attains the breakover voltage of a Shockley diode 23, the Shockley diode 23 is energized. The charge voltage of a capacitor is discharged through a high voltage transformer 25, a high voltage, being as high as tens kV, is generated at the secondary side of the high voltage transformer 25, and a spark voltage is sparked toward raw gas in the vicinity of a burner. This permits elimination of a transformer, supplying a voltage necessary to the ignitor, and an oscillating circuit actuating a combustion display lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a solenoid valve drive circuit and an igniter circuit of a combustion control system 1 used in gas combustion appliances and the like.

Configuration of conventional example and its problems For example, a hot air fan heater 1 shown in FIG.
is equipped with the control circuit shown in Fig. 2, and when the solenoid valve 2 disposed in the fuel passage is driven by Q31, or when the solenoid valve 2 is left open due to a failure in the drive circuit 3. In order to prevent a major accident from occurring when raw scum flows out when the flames blow out, many efforts have been made to prevent this.

One of them is the intersection 7511, connection, and drive system of the solenoid valve 2. This is performed via the pulse transformer 4, which is necessary for opening and maintaining the solenoid valve 1.1. In other words, the solenoid valve 2 is driven by exciting the primary side of the pulse transformer 4 with a signal from the fuel (L) sensor, and opening the solenoid valve 2 with the secondary voltage. The transistor which energizes the side is turned on = + -1 - failure, open Even if the failure occurs, the pulse transformer ← 1 is not energized, no voltage is supplied to the solenoid valve and it is opened, 1, a very fail-safe circuit. In addition, in general, 1 for this excitation is performed most efficiently, 2
It is performed at 0 KHz to 40 KHz.

On the other hand, combustion appliances must have an ignition circuit 5 that charges up the capacitor and then generates high pressure.
・Discharge occurs through a transistor or the like through the primary side of the lamp, and a high 1 varnish spark of more than 10 KV is generated on the secondary side. Generally, this charge-up requires a voltage of 10 oV or more, but since this igniter is controlled by a circuit with a voltage of several volts to several tens of volts, the voltage higher than 10 oV is further controlled by a separate transformer 6 that controls the voltage of the control circuit. The voltage was increased to over 100v.

In addition, a combustion indicator lamp 7 is provided (in order to indicate whether or not the combustion appliance is burning normally). In order to distinguish between the period of forced holding and the period of time when forced holding is ended and combustion is indicated by combustion detection by the combustion sensor, the combustion indicator lamp is blinked by an oscillator 8 during forced holding.

Therefore, an oscillator 8 was required to blink the fuel Il1 indicator lamp 7 at the start of combustion.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the conventional art, and eliminates the transformer that supplies the voltage necessary for the igniter and the oscillation circuit that drives the combustion indicator lamp 1, thereby improving economy and reliability. The purpose is to

Structure of the Invention In order to achieve the object described in the first structure of the present invention, the igniter is driven once using the voltage generated in the pulse transformer for driving the solenoid valve, which is different from the conventional igniter. ') The transformer for A is removed, and the second configuration is j: The combustion indicator lamp blinks at the start of combustion, the igniter Tti flow is changed to the solenoid valve 9,
The pulse transformer that drives it is shown at 10, and the igniter is shown at 11. A combustion indicator lamp is also shown at 12. The driving voltage of the igniter 11 is taken from the spike voltage on the primary side of the two-pulse transformer 10, and the current of the lamp 12 is placed in its current path.

1B is AC 1QOv power supply, 1. a4;
15 is a power transformer, 16 is a rectifier :), 17(
The energized lamp is shown. Also, 18 is an oscillation circuit, 19), [
2 timer circuit, 20 indicates a combustion detection circuit, 4, 21 indicates J, pulse transformer, drive transistor, 22 indicates a transistor that stops the igniter, 23 indicates a 7-point switch, 24 indicates a capacitor, and 25 indicates a high voltage transformer. .

26 is a guioto, 27 is a combustion confirmation lamp, and 28 is a resistor. Further, 29 is a pulse transformer, 30 is a diode, 31 is a capacitor, 32 is a diode, and 33 is a solenoid valve disposed in the fuel passage of the combustion appliance.

These operations will be explained following the operation of the instrument.

First, when you open the gas cock, switch 1 linked to it
4 enters. Then 15 power supplies lances and rectifiers 16
A voltage reduced to about 10V is supplied to the control circuit, and 17 energizing lamps are turned on. Further, the oscillation of 18 is started, and the l transistor 21 is oscillated by the timer 19 regardless of the resistance value of the sensor B, and the pulse transformer 29 is excited. The excited pulse transformer generates an AC voltage on the secondary side, which is rectified by a diode 30 and a capacitor 31, resulting in a DC voltage of 3.
The solenoid valve opens and sends gas to the burner (not shown), and the pulse transformer 29 connects to N1J with AC coupling to the primary side to increase transmission efficiency. Since the flyback method is used, a high voltage of 100-odd volts is generated, and a combustion lamp of 1.27 in.
24 capacitors are charged up through 26 diodes. , When the voltage of f-■- reaches the voltage of the diode of 23, 2
The shock 1/- diode of 3 conducts, and the charge voltage d of the capacitor is discharged through the high voltage transformer of 25. 1, thus the raw gas is ignited and combustion begins. In addition, the capacitor 24 discharged by the power supply auto 23 is turned off due to voltage drop, and the pulse transformer voltage 29 is supplied to charge up the capacitor 24. Then, when the breakover voltage is reached, the Shockley diode is again rendered conductive and non-sparking occurs. Sparks occur several times a second when 22 transistors are turned off by a timer 20.
It is done with the sweetness of N.

Therefore, the combustion lamp d: is blinking during this time.

Combustion has started, and the timer 19 is operating when the sensor a is sufficiently heated, but when the operation is completed, the transistor 21 oscillates with a signal from only the combustion detection circuit 20. If the combustion flame blows out, it will stop and the solenoid valve 33
When the voltage is no longer available, the valve closes to prevent raw gas from flowing out, thereby preventing accidents caused by gas leaks. Also, the transistor 21
If there is a failure, there will be no oscillation, so the pulse transformer will not be energized and the solenoid valve will not open.

Effects of the Invention As described above, the present invention uses the voltage of more than 100 V required for the igniter as a drive transformer for the solenoid valve, so there is no need for a transformer to operate the igniter as in the past, making it economical. Excellent in
It has high usability value.

Also, when the solenoid valve is forcibly held, the combustion lamp blinks even without an oscillator, making it very easy to use.

[Brief explanation of the drawing]

Figure 1 is an external perspective view of a conventional gas hot air fan heater.
Fig. 2 is a block diagram of the same combustion control circuit, Fig. 3 is a block diagram of the 11 side corner circuits of the combustion control circuit according to an embodiment of the present invention, and Fig. 4 is a block diagram of the same control circuit. 11...Igniter, 27...Combustion indicator lamp, 29...Pulse transformer, 33...
・・Electric (1'ti j "6゜I41 names F" Satoshi Nakao Satoshi SoJ and 1 other person Figure 1 Ho 2

Claims (2)

[Claims] (1) A solenoid valve arranged in a fuel passage to control fuel supply, a pulse transformer that supplies the current necessary for the solenoid valve by AC coupling, and an igniter driven by the voltage on the primary side of the pulse transformer. A control g-l for a combustion appliance comprising:
. (2) a solenoid valve arranged in a fuel passage to control fuel supply; a pulse transformer that supplies the current necessary for the solenoid valve through AC coupling; and an igniter driven by the voltage on the primary side of the pulse transformer; A control device for a combustion appliance, comprising: a light-emitting indicator in a current path for supplying the igniter.