JP3061557B2 - Gas equipment control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to ignition, opening and closing of gas valves,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit for a gas appliance that performs other control electrically and reduces consumption of a dry battery used as a power supply.

2. Description of the Related Art Conventionally, as a control circuit for a gas appliance of this kind, an ignition switch S ₁ ′ interlocking with an ignition operation and a water flow switch S ₂ ′ for detecting the presence or absence of a water flow are shown in FIG.
If, connects' the microcomputer 3 'flame detection circuit 2 for detection of the flame based on the output voltage of the battery 7' is directly connected to the constantly flame detection sensor 1 'is a power to, and the ignition switch S _1' water flow switch S ₂ 'on the a signal with off, the flame detection circuit 2' based on the output signal from the opening and closing of the microcomputer 3 gas valve 4 by 'the gas valve drive circuit 5 connected to the output side of the'' 2. Description of the Related Art Control circuits for controlling gas appliances are known.

[0003]

In the prior art, an ignition switch S ₁ ′ is turned on by an ignition operation, a water flow switch S ₂ ′ is turned on in accordance with the flow of water, and the output of a flame detection sensor 1 ′ is further increased. When ignition of the ignition burner is confirmed from the voltage by the flame detection circuit 2 ', a control signal is sent from the microcomputer 3' to the gas valve drive circuit 5 'to open the gas valve 4' and the main burner starts combustion to supply hot water. but those not ignited operated ignition switch S ₁ 'is when is off, or is ignited operated ignition switch S _1' is is passed through by not flow switch S ₂ even on 'a clear Even when the so-called gas appliance is in the standby state, the dry cell 7 'as a power supply is directly connected to the flame detection circuit 2', so that the presence of the flame is always detected.

Therefore, even when the gas appliance is in a standby state and it is not necessary to detect the flame, the flame detection circuit 2 'is energized and the power is wasted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method in which gas equipment is stopped or ignition is performed, but water is not supplied. In the so-called standby state,
The microcomputer enters the low power consumption mode, stops supplying power to various detection and control circuits such as the flame detection circuit, suppresses power consumption, and serves as a power supply without deteriorating the usability of gas equipment. An object of the present invention is to provide a control circuit for a gas appliance in which consumption of a dry battery used is reduced.

[0006]

In order to achieve the above object, the present invention provides an ignition switch S ₁ which is linked to an ignition operation, for example, as shown in FIGS. 1 and 2 corresponding to the embodiment. And a water flow switch S ₂ for detecting the presence or absence of a water flow
And various detection and control circuits 2 such as a flame detection circuit and the like, connected to a microcomputer 3, and a control circuit of a gas appliance that opens and closes a gas valve 4 based on an output signal of the microcomputer 3. said ignition in decommissioning the microcomputer 3 switches S ₁ and the water flow switch S ₂
There standby state in the off, or have been ignited operation enters the low power consumption mode when the ignition switch S ₁ is not the water flow is turned on, the water flow switch S ₂ is in the standby state turned off, the ignition manipulated also it is additionally provided a function to operate return when both the ignition switch S ₁ and the water flow switch S ₂ is turned on by operation command state water flow, upon entering connected to the output side of the microcomputer 3 to the low power consumption mode An energization control circuit 8 for stopping the energization and energizing when the operation is restored is provided. The power supply 7 such as a dry battery and a signal required for the microcomputer 3 such as a flame detection circuit to return to an operation via the energization control circuit 8 are provided. It is connected to various detection and control circuits 2 other than the emitting circuit. In addition, a transistor switching circuit that controls the energization by switching the transistor Tr based on the output signal of the computer 3 may be used as the energization control circuit 8.

[0007]

[Action] water flow switch S for detecting the presence or absence of the ignition switch S ₁ and the water flow linked to the ignition operation gas appliance is in use is stopped
If ₂ is off, or the ignition operation is when the ignition switch S ₁ is not passed through the on-water flow switch S ₂ off, when the so-called gas appliances is in the standby state, the ignition switch S ₁ on a water jet switch S _2, an oFF signal is inputted to the microcomputer 3, the microcomputer 3 enters a low power consumption mode, to maintain the current supply control circuit 8 connected to the oFF state, various such flame detection circuit Power supply 7 such as a dry battery to the detection and control circuit 2
The power supply from is stopped.

Accordingly, since signals such as ignition confirmation are not input to the microcomputer 3 from the flame detection circuit and other detection and control circuits 2, the microcomputer 3 is connected to the output side of the microcomputer 3 and controlled by an operation signal. The gas valve 4 remains closed.

[0009] Then, when the ignition operation is passed through the both turned on the ignition switch S ₁ and the water flow switch S _2, a microcomputer 3 by these signals the operation returns turned operation command state from the low power consumption mode Then, the power supply control circuit 8 is turned on, and the power supply 7 such as a dry battery is connected to the various detection and control circuits 2 such as a flame detection circuit to start supplying power. Along with this, a signal such as ignition confirmation is input from the flame detection circuit and other detection and control circuits 2 to the microcomputer 3 and connected to the output side of the microcomputer 3 to open the gas valve 4 by the operation signal. The main burner burns and supplies hot water.

When a transistor switching circuit is used as the energization control circuit 8, the transistor Tr is turned on and off by an output signal of the microcomputer 3 to perform a switching operation. Of electric power from a dry battery or the like to the circuit 2 for use in the vehicle.

As described above, when the microcomputer 3 is in the low power consumption mode, various detection and control circuits such as a flame detection circuit are used.
Detects circuits other than those that output signals necessary for operation return,
Only when the microcomputer 3 is in the operation command state and returns to the operation state is not in the control posture, the detection and control posture is entered.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a control circuit for gas appliances according to the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, S ₁ is an ignition switch that is turned on and off in conjunction with an ignition operation, is connected to a dry battery 7 via a resistor R ₁ , and S ₂ is turned on by detecting the presence or absence of water flow. , The water flow switch to turn off, the resistance R
_The microcomputer 3 is connected so that signals associated with turning on and off the ignition switch S ₁ and the water flow switch S ₂ can be input to the microcomputer 3.

[0014] The microcomputer 3 if not the ignition operation based on the signal, i.e. the ignition switch S ₁ is turned off the water flow switch S ₂ and the time off, or is ignited operated ignition switch S ₁ is turned on there when water flow switch S ₂ is not passed through is off, so when the gas appliance is in a standby state enters a low power mode, the ignition operation is an ignition switch S ₁ and the water flow switch S ₂ are both turned on to operate It has a function of returning to operation when it enters the command state.

Reference numeral 8 denotes a transistor switching circuit which is connected to the output terminal 6 of the microcomputer 3 and turns on and off when the transistor Tr performs a switching operation. The transistor switching circuit 8 is provided between the dry cell 7 and the flame detection circuit 2 so that the microcomputer 3 When in the power consumption mode, the transistor Tr is in the off state, the power supply to the flame detection circuit 2 is stopped, and when the microcomputer 3 returns to the operation command state and returns to the operation, the transistor Tr is turned on.
This is to energize the flame detection circuit 2.

The flame detection circuit 2 is connected to a flame detection sensor 1, such as a thermocouple, installed facing the upper part of the ignition burner. The flame detection circuit 2 determines the ignition burner based on the magnitude of the generated thermoelectromotive force of the sensor 1. It is detected whether or not ignition has occurred. When ignition is confirmed, an ignition confirmation signal is input from the flame detection circuit 2 to the microcomputer 3.

Further, a gas valve driving circuit 5 is connected to the output side of the microcomputer 3, and the opening and closing of the gas valve 4 connected to the gas valve driving circuit 5 is controlled by an output signal from the microcomputer 3. I have. When an operation signal is output from the microcomputer 3, the gas valve drive circuit 5 operates to open the gas valve 4 to supply gas to the main burner, and the ignition burner starts combustion of the main burner to supply hot water. is there.

In the above embodiment, the microcomputer 3 having a function to enter a low power consumption mode based on a signal accompanying turning on and off of the ignition switch S ₁ and the water flow switch S ₂ and a function to return to operation are used. But
In gas appliances such as no stove water flow switch-on of only the ignition switch S _1, and based off signal enters the low power consumption mode function, using the microcomputer 3 has a function to operate return, The consumption of a dry battery used as a power source for a gas range or the like can be suppressed.

[0019]

Since the present invention is configured as described above, when the ignition device is not operated, or when the ignition device is operated but the water is not passed, the so-called gas appliance is in a standby state. In other words, the supply of electric power from a power supply such as a dry battery to various detection and control circuits such as a flame detection circuit is stopped by the power supply control circuit.

Therefore, in the standby state, the various detection and control circuits such as the flame detection circuit are not energized, so that the consumption of the dry battery can be reduced. Since there is no need to operate various detection and control circuits, there is no inconvenience in use.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit of a gas appliance according to the present invention.

FIG. 2 is a flowchart illustrating an operation state of a control circuit of a gas appliance according to the present invention.

FIG. 3 is a block diagram showing a control circuit of a conventional gas appliance.

[Explanation of symbols]

S ₁ ignition switch S ₂ water flow switch 2 various detection and control circuits 3 microcomputer 4 gas valve 7 power supply 8 power supply control circuit

Claims (2)

(57) [Claims] A microcomputer is connected to an ignition switch linked to an ignition operation, a water flow switch for detecting the presence or absence of a water flow, and various detection and control circuits such as a flame detection circuit. In the control circuit of the gas appliance that opens and closes the gas valve based on the output signal, the microcomputer switches the ignition switch and the water flow switch off or the ignition switch is on when the water flow switch is in a standby state of the low power consumption mode. When both the ignition switch and the water flow switch are turned on and the operation command state is reached, a function to return to operation is added.When connected to the output side of the microcomputer and entering the low power consumption mode, the power supply is stopped, and the operation is stopped. An energization control circuit is provided to energize when returning, and various power supplies such as a dry battery and a flame detection circuit are provided through the energization control circuit. A control circuit for a gas appliance to which a circuit for detecting and controlling a gas is connected. 2. The control circuit for a gas appliance according to claim 1, wherein the energization control circuit is a transistor switching circuit that controls the energization by switching a transistor according to an output signal of the microcomputer.