JPH04102595U - Battery-powered gas igniter - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a battery-powered gas ignition device that prevents spark discharge from occurring when the voltage of the battery drops below a specified value due to battery consumption. [Structure] In a battery-powered gas ignition device comprising a battery 1, a blocking oscillation circuit 2 connected to the battery 1, and a spark discharge circuit 4 connected to the output side of the oscillation circuit 2, the battery A switching circuit 5 is provided which turns on the blocking oscillation circuit 2 when the voltage is above a specified value, and turns off the blocking oscillation circuit 2 when the battery voltage is depleted below the specified value.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention consists of a battery used as a power source, a blocking oscillation circuit, and a spark discharge circuit. Regarding gas ignition devices, especially when the voltage drops below the specified value due to battery consumption. The battery is designed to turn off the oscillation circuit and prevent spark discharge when the This relates to a type gas ignition device.

0002

[Conventional technology]

The DC voltage of the battery is converted to AC voltage by a blocking oscillation circuit, and this is converted into an AC voltage by a diode. The capacitor is once charged by rectifying it with an ode, and the charging voltage is the same as that of a thyristor, etc. When the breakover voltage of the semiconductor switching element is exceeded, the capacitor's current The load is discharged to the primary side of the ignition transformer, inducing high voltage on the secondary side and causing a fire in the discharge gap. A flower discharge is generated, which ignites the gas ejected from the gas burner. Battery-powered gas igniters are known.

0003 In such an ignition device, the battery voltage reaches the specified value (approximately 0.8 to 0.9 volts). If the battery is used continuously until it reaches a specified value or lower, the battery will be replaced.

0004

[Problem that the idea aims to solve]

By the way, due to battery consumption, the battery voltage drops below the specified value, for example, to 0.5 volts. Blocking oscillation occurs even when the battery is replaced, causing spark discharge. is often lost. This increases the time it takes to charge the capacitor and causes a fire. Flower discharge will occur later than usual.

[0005] This delay in spark discharge occurs when the gas combustion appliance is filled with a considerable amount of gas. It may ignite, producing a loud explosion or damaging equipment with the blast wave. There was a danger that.

[0006]

[Means to solve the problem]

For this reason, the present invention prevents the above-mentioned blocking when the battery voltage falls below the specified value. A switching circuit is installed to turn off the oscillation circuit and reliably suppress the occurrence of spark discharge. The configuration was as follows.

[0007]

【Example】

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a battery, the positive electrode of which is a switch. Positive line L via switch 3₁ , the negative electrode is the negative line L₂ connected to each has been done. 2 is a transistor-type blocking oscillation circuit, in which the oscillation transistor T r₁and oscillation transformer T₁ The oscillation transformer T₁ One end of the primary coil is resistor R ₁ through the transistor Tr₁on the base side of the transistor Tr, and the other end is the transistor Tr.₁collector of The middle point of the primary coil receives DC voltage from the battery. Ruyo Plus Line L₁ It is connected to the. Also, the oscillation transistor Tr₁emmy negative line L on the side₂ and further connected to the oscillation transistor Tr as necessary.₁ A capacitor C is connected between the base and emitter of₁ is connected.

[0008] 4 is connected to the secondary coil side of the oscillation transformer T1 of the blocking circuit 2. In the spark discharge circuit, diode D₁ and charging/discharging capacitor C₁ and thyristors etc. semiconductor switching element S and ignition transformer T₂ and diode D ₁ and capacitor C₁ is the ignition transformer T₂ in series with the primary coil of the switch. The switching elements S are connected in parallel. Also, ignition transformer T₂ There is a ga It connects a spark gap G installed near a burner (not shown). Kokoma The configuration is conventionally known.

[0009] Next, 5 shows a switching circuit according to the present invention, in which the first to fourth transistors Tr₂~Tr_Fiveand multiple resistors R₂ ~R₇ , Zener diode Z, and diode D₂ and the first transistor Tr₂The base side of is a Zener diode Z and Resistance R₂ and the collector side is connected to the resistor R₃ respectively through the plus line L ₁ connected to the first transistor Tr₂The emitter side of is resistor R_Four Maina via Sline L₂ are connected to each. Also, the second transistor Tr₃base of The side is the first transistor Tr₂The collector side is connected to the collector side of the In L₂ It is connected to the. Also, the second transistor Tr₃The emitter side of is the third Transistor Tr_Fouralong with the emitter side of the resistor R_Five plus line L through₁ connect to has been done. Furthermore, a third transistor Tr_FourThe collector side of is the fourth transistor Tr_Fiveis connected to the base side of the the third transistor Tr_FourThe base side of series resistance R₆ , resistance R₇ connected between. Said fourth transistor T r_FiveDiode D between the base and emitter of₂ is connected, and the fourth transistor Tr_Five The collector side of is the oscillation transistor T of the blocking oscillation circuit 2.₁ connected to the base side of It is continued.

The breakdown voltage of the Zener diode Z is determined so as to apply a reference voltage (approximately 0.8 volts) to the base of the first transistor Tr ₂ . A diode may also be used. However, from the point of view of temperature characteristics, it is desirable to use a Zener diode Z.

[0011]Furthermore, it is preferable that the first to fourth transistors Tr ₂ to _{Tr 5} have a direct current amplification factor (h _FE ) of 1000 or more in order to stably perform the switching operation.

The operation of the switching circuit according to the present invention will be explained below. a) When the battery voltage is high enough. When the switch 3 is closed, the reference voltage is supplied by the Zener diode Z to the base of _the first transistor Tr 2 through the Zener diode Z and the resistor R ₂ , so that the transistor Tr ₂ is turned on. When this transistor Tr ₂ is turned on, current is also supplied to the base of the second transistor Tr ₃ through the resistor R ₃ and the transistor Tr ₃ is also turned on. When this transistor Tr ₃ is turned on, its emitter voltage becomes the base voltage (+V _BE ). The emitter voltage of the second transistor Tr ₃ and the emitter voltage of the third transistor Tr ₄ are the same value, and at this time, the base voltage of the third transistor Tr ₄ (divided voltage of series resistors R ₆ and R ₇ ) When is higher than the emitter voltage (-V _BE ), the transistor Tr ₄ is turned off, no current is supplied to the base side of the fourth transistor Tr ₅ , and the fourth transistor Tr ₅ is also turned off. By turning off the fourth transistor Tr ₅ , the oscillation transistor Tr ₁ of the blocking oscillation circuit receives the battery voltage and oscillates as usual together with the oscillation transformer T ₁ , which is converted into an alternating current voltage. The voltage is boosted and output to the secondary coil side of _T1 . This AC output is rectified by diode D ₁ and charges capacitor C ₁ . When the charging voltage reaches the breakover voltage of the semiconductor switching element S, the switching element S becomes conductive, and the charge in the capacitor _C1 is released to the primary coil side of the ignition transformer _T1 , resulting in a high voltage on the secondary coil side. spark discharge is induced in the discharge gap G and ignites the gas ejected from the gas burner.

b) When the battery voltage drops below the specified value due to exhaustion or the like. When the switch 3 is closed, since the battery voltage has dropped below 0.8 volts, the Zener diode Z is in a blocking state, and the reference voltage is not supplied to the base of the first transistor Tr ₂ , which is turned off and the second The transistor _Tr3 is also turned off. When the second transistor Tr ₃ is turned off, the emitter voltage of the third transistor Tr ₄ becomes higher than the base voltage (+V _BE ), and the third transistor Tr 4 is turned on. When the third transistor Tr ₄ is turned on, current is supplied to the base of the fourth transistor Tr ₅ through the resistor R ₅ , turning the fourth transistor Tr ₅ on.

[0014]By turning on the fourth transistor _Tr5 , the oscillation transistor _Tr1 of the blocking oscillation circuit 2 is short-circuited, making it impossible to oscillate. As a result, no sparks are generated in the discharge gap G.

[0015]

[Effect of the idea]

According to the present invention, when the battery voltage drops below the specified value due to exhaustion, etc. , since the blocking oscillation circuit does not oscillate and the induction of spark discharge can be reliably suppressed. If the ignition does not ignite after the ignition operation, it is easy to see that the battery voltage is below the specified value. Not only can you accurately know when it is time to replace the battery, but you can also This eliminates the possibility of explosion noise caused by delayed flower discharge and damage to equipment, allowing for safe ignition. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

[Explanation of code] 1 Battery 2 Blocking oscillation circuit 4 Spark discharge circuit 5 Switching circuit

Claims (1)

[Scope of utility model registration request] a battery; a blocking oscillation circuit connected to the battery;
and a spark discharge circuit connected to the output side of the oscillation circuit, when the battery voltage is above a specified value, the blocking oscillation circuit is turned on, and when the battery voltage is below the specified value. A battery-powered gas ignition device characterized in that a switching circuit is provided to turn off the blocking oscillation circuit when the battery is exhausted.