JP3606476B2 - Combustion control circuit - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a combustion control circuit that forcibly blocks combustion by flowing a reverse current through an electromagnetic safety valve in a combustion safety device including a thermocouple and an electromagnetic safety valve.
[0002]
[Prior art]
As shown in FIG. 5, a conventional combustion control circuit of this type includes a transistor Q ₁ ′ and a transistor Q ₂ ′ that flow excitation currents in opposite directions to the electromagnetic safety valve Mg ′, and both transistors Q ₁ ′, Q 2 connect _'to connect the collector to each other of the electromagnetic safety valve Mg' ₂ in and the emitter of the transistors 'connected to the switches SW' cell E alternating the base current to the transistor Q _{1 ',} Q _2' by switching When the ignition switch SW ′ is turned on and the ignition switch SW ′ is turned on, the common terminal C and the normally open terminal NO are connected, and the body ground and the negative of the battery E ′ are connected, whereby the transistor Q ₁ ′ is connected. base current 'flows in, the capacitor _{C 1'} capacitor _{C 1} transistor _{Q 1} until the charged up 'is turned on, the electromagnetic safety valve Mg' in Current flows in the direction shown SW _ON to hold the electromagnetic safety valve Mg 'in the open state. When the ignition switch SW ′ is turned off to cut off the combustion, the common terminal C is connected to the normally closed terminal NC, thereby connecting the body ground and the positive of the battery E ′, and the transistor Q ₁ ′ is connected to the capacitor Q ₁ ′. C 1 transistor Q ₁ stops flowing base current _'negative battery E' of which is connected to the positive _'is turned off, the transistor Q _2' the base current of _'flow in, the capacitor C _2' capacitor C ₂ is charged The transistor Q ₂ ′ is turned on until it is _{turned on} , and a reverse current flows from the battery E ′ to the SW _OFF shown in the figure through the electromagnetic safety valve Mg ′. A combustion control circuit is proposed to close the electromagnetic safety valve Mg ′ and forcibly cut off combustion. Has been.
[0003]
[Problems to be solved by the invention]
As described in the prior art, the reverse current that flows to the electromagnetic safety valve is a method that flows directly from the battery by a transistor, so it is difficult to adjust the reverse current that flows from the battery to the electromagnetic safety valve, and when the battery is exhausted However, since the voltage applied to the electromagnetic safety valve cannot be increased, the electromagnetic safety valve cannot be reliably closed.
Furthermore, since the body ground is not always connected to the negative side of the battery, it is very difficult to develop the circuit configuration even if the voltage applied to the electromagnetic safety valve is to be doubled or n-fold. there were.
[0004]
In view of such problems of the prior art, the present invention charges a capacitor by a charge command signal, causes the charge charged to the capacitor to flow as a reverse current to the electromagnetic safety valve by a cutoff command signal, and closes the electromagnetic safety valve. The purpose of the present invention is to provide a combustion control circuit that can forcibly cut off combustion and increase the voltage applied to the electromagnetic safety valve. An object of the present invention is to provide a combustion control circuit that can be applied, and can reliably close an electromagnetic safety valve and forcibly cut off combustion even when the battery voltage drops.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a combustion control circuit according to claim 1 of the present invention is a combustion control circuit that closes an electromagnetic safety valve by forcing an exciting current in the reverse direction to the electromagnetic safety valve Mg to forcibly cut off combustion. in, turned on by the charging command signal, a first switching element Q ₁ to turn off the interruption command signal, turns off the charge instruction signal, and a second switching element Q ₂ to which is turned on by the interruption command signal, the first switching A circuit for connecting the capacitor C ₁ to the battery E via the element Q ₁ , a circuit for connecting the capacitor C ₁ to the electromagnetic safety valve Mg and the transistor Q ₃ via the second switching element Q ₂ , and discharging a capacitor C ₄ to double the initial voltage is inserted connected between the electromagnetic safety valve Mg and the transistor Q _3, the capacitor C ₄ second When the first switching element Q ₁ is connected to one switching element Q ₁ and the first switching element Q ₁ is turned on by the charge command signal, the capacitor C ₁ and the capacitor C ₄ are respectively connected to the battery E to form a charging circuit, and the second switching is performed by the cutoff command signal when element Q ₂ is turned on, so as to constitute a discharge circuit of the electromagnetic safety valve Mg the capacitor C _1, C capacitor C ₁ turns on the transistor Q ₃ by the charge voltage of ₄ and capacitor C ₄ are connected in series To do .
[0006]
According to a second aspect of the present invention, there is provided a combustion control circuit that closes the electromagnetic safety valve by forcing an exciting current in the reverse direction to the electromagnetic safety valve Mg to forcibly cut off combustion. turned, the first switching element Q ₁ to turn off the interruption command signal, turns off the charge instruction signal, and a second switching element Q ₂ to which is turned on by the interruption command signal, via the first switching element Q ₁ a circuit for connecting the capacitor C ₁ to the battery E, via the second switching element Q ₂ is provided a circuit for connecting the capacitor C ₁ to the electromagnetic safety valve Mg and transistor Q _3, and, in order to double the initial discharge voltage The transistor Q ₄ that is turned on when the capacitor C ₂ and the second switching element Q ₂ are turned on is applied with the capacitor charging voltage. The doubling circuit A ₁ is a set, and the doubling circuits A ₁ and A ₂ are connected in parallel to the first switching element Q ₁ and connected to the capacitor C ₁ in parallel. when the first switching element Q ₁ is turned on, when each capacitor constitute a charging circuit connected to the battery E, the second switching element Q ₂ is turned on by interruption command signal, the transistors Q _3, Q _4, Q ₅ Is turned on and the capacitors are connected in series to form a discharge circuit to the electromagnetic safety valve Mg .
[0007]
[Action]
The combustion control circuit according to claim 1, wherein the invention, when the first switching element Q ₁ is turned on by the charging command signal, capacitor C ₁ and the capacitor C ₄ is charged respectively connected to the battery E. The first switching element Q ₁ is turned off by interrupting the command signal to stop the combustion in the combustion by the action of a timer or the like, the second switching element Q ₂ is turned on. As a result, the charging voltage of the capacitors C _{1 and} C ₄ is applied to the transistor Q ₃ to be turned on, and the discharging circuit of the capacitor C ₁ → the second switching element Q ₂ → the electromagnetic safety valve Mg → the capacitor C ₄ → the transistor Q ₃ is configured. The electric charges charged in the capacitors C ₁ and C ₄ flow to the electromagnetic safety valve Mg, and the electromagnetic safety valve Mg is closed to stop the combustion.
In this case, the capacitor C ₁ and capacitor C ₄ are connected in series in the discharge circuit, approximately twice the discharge initial voltage is applied to the electromagnetic safety valve Mg.
[0008]
Further, combustion control circuit according to claim 2, wherein the invention, a doubling circuit A ₁ comprising a capacitor C ₂ and the transistor Q ₄ as one set, was inserted connecting the plurality of sets A _1, A ₂ the doubling circuit in parallel Therefore, when the first switching element Q ₁ is turned on, the capacitors C ₁ , C ₂ , C ₃ , and C ₄ are connected to the battery E and charged, respectively, and when the second switching element Q ₂ is turned on, the capacitor C ₁ → second switching. The discharge circuit of element Q ₂ → electromagnetic safety valve Mg (→ capacitor C ₄ ) → transistor Q ₃ → capacitor C ₃ → transistor Q ₅ → capacitor C ₂ → transistor Q ₄ is configured, and the electromagnetic safety valve Mg includes capacitors C ₁ and C. ₂ , C ₃ and C ₄ are charged, and an initial discharge voltage of about 3 times (4 times) is applied to the electromagnetic safety valve Mg. The Note that () is written when the capacitor C ₄ is inserted and connected between the electromagnetic safety valve Mg and the transistor Q ₃ .
[0009]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0010]
In FIG. 1, a series circuit of a transistor Q ₁ , a diode D ₁ , a capacitor C ₁ and a resistor R ₁ is connected to a battery E to form a capacitor charging circuit, and a common of the switch SW for inputting a charging command signal and a cutoff command signal connecting the base of the terminal C of the transistor Q ₁ via the resistor R _8, transistor Q ₁ base current flows is turned to the common terminal C and the normally open terminal NO of the switch SW is connected transistors Q _1, The capacitor C ₁ is charged from the battery E through a path of the transistor Q ₁ → the diode D ₁ → the capacitor C ₁ → the resistor R ₁ . At this time MOSFET Q ₂ and the transistor _{Q 3} are in the OFF state.
[0011]
The MOSFET Q ₂ has a drain connected between the diode D ₁ and the capacitor C ₁ of the capacitor charging circuit, a gate connected to the common terminal C of the switch SW, a source connected to one end of the resistor R ₁ and the negative side of the battery, a transistor The base resistance R _{5 of} Q ₃ is connected to the electromagnetic safety valve Mg.
Transistor Q ₃ are the collector electromagnetic safety valve Mg, the emitter is connected between the capacitor C ₁ and resistor R ₁ of the charging circuit. TC is a thermocouple connected to the electromagnetic safety valve Mg, and when heated by a burner flame, an excitation current is passed through the electromagnetic safety valve Mg to keep the electromagnetic safety valve Mg open.
[0012]
When the switch command signals to cut-off side switch SW common terminal C and the normally closed terminal NC shutoff signal is connected to the gate of MOSFET Q ₂ is input MOSFET Q ₂ is turned on to charge voltage transistor _{Q 3} of the capacitor _{C 1} of is applied between the emitter and the base and between the emitter and the collector, the transistor _{Q 3} is turned on, the discharge circuit of the capacitor _{C 1} → MOSFET Q ₂ → electromagnetic safety valve Mg → transistor _{Q 3} is formed, is charged in the capacitor _{C 1} The charged electric charge flows into the electromagnetic safety valve Mg, the electromagnetic safety valve Mg is closed, and the combustion can be forcibly stopped.
[0013]
2, in the above embodiments, another capacitor C ₄ is inserted and connected between the collectors of the electromagnetic safety valve Mg and the transistor Q _3, a resistor R ₄ between the diode D ₁ and capacitor C ₁ of the charging circuit When the transistor Q ₁ is turned on by the charge command signal, the capacitor C ₁ is charged through the same path as described above, and the path through the diode D ₁ , the resistor R ₄ , the capacitor C ₄ , and the electromagnetic safety valve Mg. When the capacitor C ₄ is charged and the switch SW is switched to the cut-off side, the transistor Q ₁ is turned off and the MOSFET Q ₂ is turned on to form a discharge circuit of the capacitor C ₁ → MOSFET Q ₂ → electromagnetic safety valve Mg → capacitor C ₄ → transistor Q _3. The electric charges charged in the capacitors C ₁ and C ₄ flow to the electromagnetic safety valve Mg. In this case, the initial discharge voltage of the capacitor applied to the electromagnetic safety valve Mg is approximately doubled.
[0014]
3 and 4, the diode _{D 2,} a capacitor _{C 2,} a series circuit including a resistor _{R 2,} a diode _{D 2} and a collector connected between the capacitor _{C 2,} the base resistor _{R 6} to one end of the resistor _{R 2} a doubling circuit _{a 1} comprising transistors _{Q 4} connected to base via a likewise diode _{D 3,} capacitor _{C 3,} resistor _{R 3,} the transistors _{Q 5} and doubling circuit _{a 2} consisting of a base resistor _{R 7} Figure 1 or In the embodiment of FIG. 2, the diode D ₁ , the capacitor C ₁ and the resistor R ₁ are connected in parallel, and the emitters of the transistors Q ₄ and Q ₅ are connected between the capacitor and the resistor in the previous stage. .
[0015]
According to this circuit, when the switch SW to the charging side transistor _{Q 1} is turned on the capacitors _{C 1, C 2, C 3} (C 1 in the case of FIG. _{4, C 2, C 3,} C 4) is charged When the switch SW is turned off, the MOSFET Q ₂ is turned on, and the capacitor C ₁ → MOSFET Q ₂ → the electromagnetic safety valve Mg → (capacitor C _{4 in} the case of FIG. ₄ ) → transistor Q ₃ → capacitor C ₃ → transistor Q ₅ → capacitor C ₂ → The discharge circuit of the transistor Q ₄ is configured, and capacitors C ₁ , C ₂ , C ₃ (in the case of FIG. 4, C ₁ , C ₂ , C ₃ , C ₄ ) are connected in series and applied to the electromagnetic safety valve that the discharge initial voltage of the capacitor when the n connecting the circuit a ₁ in parallel, can be approximately n times.
[0016]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0017]
In the combustion control circuit according to claim 1, two capacitors are connected and charged in parallel with the battery by the charge command signal, and the charge voltage of the capacitor is turned on by the cutoff command signal to connect the two capacitors in series. Since the electric charge charged in the capacitor can flow as a reverse current to the electromagnetic safety valve, the initial discharge voltage of the capacitor applied to the electromagnetic safety valve when the electromagnetic safety valve is closed can be approximately doubled by a simple circuit configuration. Even if the battery is exhausted and the voltage drops, the electromagnetic safety valve can be reliably closed and combustion can be stopped.
[0018]
In the combustion control circuit of claim 2, the doubling circuit consisting of a capacitor and a transistor is set as one set, and a plurality of doubling circuits are connected in parallel, so that the initial discharge voltage applied to the electromagnetic safety valve can be freely increased to about n times. Even if the battery voltage decreases, the electromagnetic safety valve can be reliably closed and the combustion can be shut off.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a combustion control circuit according to the present invention.
FIG. 2 is a circuit diagram of a combustion control circuit in which an initial discharge voltage is approximately doubled.
FIG. 3 is a circuit diagram of a combustion control circuit in which an initial discharge voltage is increased approximately n times.
FIG. 4 is a circuit diagram of a different combustion control circuit in which the initial discharge voltage is increased approximately n times.
FIG. 5 is a circuit diagram of a conventional combustion control circuit.
[Explanation of symbols]
Q ₁ first switching element _{Q 2} second switching element _{Q 3, Q 4, Q 5} transistors E cell _{C 1, C 2, C 3} , C 4 capacitors Mg electromagnetic safety valve _A 1, _{A 2} doubling circuit

Claims (2)

A first switching element that is turned on by a charge command signal and turned off by a shutoff command signal in a combustion control circuit that closes the electromagnetic safety valve by forcing an exciting current in the reverse direction to the solenoid safety valve (Mg) to forcibly cut off combustion (Q ₁ ) and a second switching element (Q ₂ ) that is turned off by a charge command signal and turned on by a cutoff command signal, and a capacitor (E) is connected to the battery (E) via the first switching element (Q ₁ ). A circuit for connecting C ₁ ), a circuit for connecting the capacitor (C ₁ ) to the electromagnetic safety valve (Mg) and the transistor (Q ₃ ) via the second switching element (Q ₂ ), and an initial stage of discharge It is inserted connected between said capacitor _{(C 4)} to double the voltage electromagnetic safety valve (Mg) and a transistor _{(Q 3),} the capacitor _{(C 4)} first Connected to switching elements (Q _1), constituting the charging circuit capacitor (C ₁₎ and a capacitor (C ₄₎ is connected to each cell (E) when the first switching element (Q ₁₎ is turned on by the charge command signal When the second switching element (Q ₂ ) is turned on by the shutoff command signal, the transistor (Q ₃ ) is turned on by the charging voltage of the capacitor (C ₁ ) (C ₄ ), and the capacitor (C ₁ ) and the capacitor (C ₄ ) Combustion control circuit characterized in that a discharge circuit to an electromagnetic safety valve (Mg) is configured by being connected in series. A first switching element that is turned on by a charge command signal and turned off by a cutoff command signal in a combustion control circuit that closes the electromagnetic safety valve by forcing an exciting current in the reverse direction to the electromagnetic safety valve (Mg) to forcibly cut off combustion (Q ₁ ) and a second switching element (Q ₂ ) that is turned off by a charge command signal and turned on by a cutoff command signal, and a capacitor (E) is connected to the battery (E) via the first switching element (Q ₁ ). A circuit for connecting C ₁ ), a circuit for connecting the capacitor (C ₁ ) to the electromagnetic safety valve (Mg) and the transistor (Q ₃ ) via the second switching element (Q ₂ ), and the initial stage of discharge for doubling the voltage, the capacitor (C ₂₎ and transistor the charging voltage of the capacitor when the second switching element (Q ₂₎ is turned on is turned on is applied Q ₄₎ consisting of a doubling circuit _{(A 1)} as one set, the capacitor with respectively connecting the doubling circuit into a plurality sets _(A 1) _{(A 2)} the first switching device and in parallel _{(Q 1)} ( C ₁ ) is connected in parallel, and when the first switching element (Q ₁ ) is turned on by the charge command signal, the charging circuit of each capacitor is configured, and the second switching element (Q ₂ ) is turned on by the cutoff command signal when the transistor _{(Q 3) (Q 4)} (Q 5) is turned on combustion control circuit characterized in that it constitutes a discharge circuit of each capacitor is connected in series to the electromagnetic safety valve (Mg).

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