JPH08210627A - Control circuit for gas equipment - Google Patents

Abstract

PURPOSE: To reduce the consumption of a dry cell used as the power source of the control circuit for a gas equipment. CONSTITUTION: A control circuit for a gas equipment comprises an ignition switch S1 a water stream switch S2 , and a flame detector 2 connected to a microcomputer 3 to switch a gas valve 4 according to the output signal of the microcomputer 3, wherein when the microcomputer 3 has functions of setting the switches S1 and S2 to a standby state upon turning ON, OFF of the microcomputer 3 to a low power consumption mode and resetting the operation upon operation commanding state, and a conduction control circuit 8 is connected to the output side of the microcomputer 3. A dry cell 7 is connected to the detector 2 via the circuit 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to ignition, opening and closing of gas valves,
The present invention relates to a control circuit for a gas device that reduces consumption of a dry battery used as a power source in a control circuit for a gas device that electrically performs other control.

Conventionally, as a control circuit of this type of gas equipment, an ignition switch S ₁ ′ interlocked with ignition operation and a water flow switch S ₂ ′ for detecting the presence or absence of 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'' A control circuit of a gas device for controlling is known.

[0003]

In the prior art, the ignition switch S ₁ ′ is turned on by the ignition operation, the water flow switch S ₂ ′ is also turned on along with the passage of water, and the output of the flame detection sensor 1 ′ is further produced. 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'and the gas valve 4'is opened to start combustion by the main burner to supply hot water. However, when the ignition operation is not performed and the ignition switch S ₁ ′ is off, or when the ignition operation is performed and the ignition switch S ₁ ′ is on, water is not passed and the water flow switch S ₂ ′ is off. Even when the so-called gas appliance is in the standby state, the dry battery 7 ', which is a power source, is directly connected to the flame detection circuit 2', so that it is always ready to detect the presence or absence of flame.

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

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to cut off the water supply while the gas equipment is stopped or ignited. In the so-called standby state that is not done,
The microcomputer enters the low power consumption mode, stops the power supply to various detection and control circuits such as the flame detection circuit, suppresses the power consumption, and as a power supply without degrading the usability of gas equipment. An object of the present invention is to provide a control circuit for gas equipment in which the consumption of dry batteries used is reduced.

[0006]

In order to achieve the above object, the present invention provides an ignition switch S _{1 which} operates in conjunction with an ignition operation, as shown in FIGS. 1 and 2 corresponding to an embodiment. And a water flow switch S ₂ for detecting the presence or absence of water flow
And a circuit 2 for various detection and control such as a flame detection circuit and the like to a microcomputer 3, and a gas device control circuit for opening and closing a gas valve 4 based on an output signal of the microcomputer 3, When the microcomputer 3 is not in use, the ignition switch S ₁ and the water flow switch S ₂
Is off, or when ignition is being operated but water is not flowing and ignition switch S ₁ is on and water flow switch S ₂ is off and in standby mode, low power consumption mode is entered and ignition is operated. When water is passed and both the ignition switch S ₁ and the water flow switch S ₂ are turned on and the operation command state is reached, a function for returning to operation is additionally provided, and the function is connected to the output side of the microcomputer 3 to enter the low power consumption mode. An energization control circuit 8 that energizes when power is stopped and returns to operation is provided. Through the energization control circuit 8, a power supply 7 such as a dry battery and a signal necessary for the microcomputer 3 such as a flame detection circuit to return to operation are provided. Various detection and control circuits 2 other than the emitting circuit are connected. The energization control circuit 8 may be a transistor switching circuit that controls energization by switching the transistor Tr according to the output signal of the computer 3.

[0007]

[Operation] Ignition switch S ₁ interlocked with ignition operation when gas equipment is not in use and water flow switch S for detecting the presence or absence of water flow
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 An on / off signal from the water flow switch S ₂ is input to the microcomputer 3, the microcomputer 3 enters a low power consumption mode, keeps the energization control circuit 8 connected thereto in the off state, and various types of flame detection circuits and the like. Power source 7 such as a dry battery to the circuit 2 for detecting and controlling
Keep the power supply from the power supply stopped.

Along with this, signals such as ignition confirmation are not input from the flame detection circuit and other detection and control circuits 2 to the microcomputer 3, so that they are connected to the output side of the microcomputer 3 and controlled by the operation signal. The gas valve 4 that remains remains closed.

When the ignition operation is performed and water is passed, both the ignition switch S ₁ and the water flow switch S ₂ are turned on, and the microcomputer 3 is brought into the operation command state from the low power consumption mode by these signals, and the operation is restored. Then, the energization control circuit 8 is turned on, the power source 7 such as a dry battery is connected to the various detection and control circuits 2 such as the flame detection circuit, and the supply of electric power is started. Along with this, signals such as ignition confirmation are input to the microcomputer 3 from the flame detection circuit and other detection and control circuits 2 and are connected to the output side of the microcomputer 3 to open the gas valve 4 by an 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 the output signal of the microcomputer 3 to perform a switching operation, and various detection and control operations such as a flame detection circuit are performed. The supply of electric power from a dry battery or the like to the power supply circuit 2 is controlled.

As described above, when the microcomputer 3 is in the low power consumption mode, various circuits for detection and control such as a flame detection circuit are used for the microcomputer 3.
Is detected except for the circuit that outputs the signal necessary for operation recovery,
It is not in the control posture, and only when the microcomputer 3 enters the operation command state and returns to the operation, the detection and control posture is entered.

[0012]

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

In FIGS. 1 and 2, S ₁ is an ignition switch which is turned on and off in association with an ignition operation, which is connected to the dry battery 7 through a resistor R ₁ and S ₂ is turned on by detecting the presence or absence of a water flow. , A water flow switch to turn off the resistance R to the dry battery 7 in the same manner.
₂ and is connected so that signals associated with turning on and off of the ignition switch S ₁ and the water flow switch S ₂ can be input to the microcomputer 3.

When the ignition operation is not performed based on the signal, the microcomputer 3 operates when the ignition switch S ₁ is off, when the water flow switch S ₂ is off, or when the ignition operation is performed and the ignition switch S ₁ is on. If water is not passed through and the water flow switch S ₂ is off, and the so-called gas equipment is in the standby state, the low power consumption mode is entered, ignition operation is performed, and both the ignition switch S ₁ and the water flow switch S ₂ are turned on and activated. It has a function of returning to the operation when the command state is entered.

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 is installed between the dry battery 7 and the flame detection circuit 2 and the microcomputer 3 is turned on. When the power consumption mode is entered, the transistor Tr is in the off state, the energization of the flame detection circuit 2 is stopped, and when the microcomputer 3 enters the operation command state and the operation is restored, the transistor Tr is turned on,
The flame detection circuit 2 is energized.

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, and the flame detection circuit 2 detects the ignition burner based on the magnitude of thermoelectromotive force generated by the sensor 1. Whether or not ignition has occurred is detected, and when ignition is confirmed, an ignition confirmation signal is input from the flame detection circuit 2 to the microcomputer 3.

Further, a gas valve drive circuit 5 is connected to the output side of the microcomputer 3, and the gas valve 4 connected to the gas valve drive circuit 5 is controlled to be opened and closed by an output signal from the microcomputer 3. There is. Then, when an operation signal is output from the microcomputer 3, the gas valve drive circuit 5 is operated, the gas valve 4 is opened, gas is supplied to the main burner, and the main burner starts combustion by the ignition burner to supply hot water. is there.

In the above embodiment, the microcomputer 3 having the function of entering the low power consumption mode on the basis of the signals accompanying the turning on and off of the ignition switch S ₁ and the water flow switch S ₂ and the function of returning to the operation is used. But
In a gas appliance such as a gas range without a water flow switch, if a microcomputer 3 having a function of entering a low power consumption mode based on an ON / OFF signal of only the ignition switch S ₁ and a function of returning to operation is used, It is possible to suppress the consumption of dry batteries used as a power source for a gas range or the like.

[0019]

EFFECTS OF THE INVENTION The present invention is configured as described above, and therefore, when the ignition operation is not performed, or when the ignition operation is performed but water is not supplied, so-called gas equipment is in a standby state. Then, the power supply control circuit stops the supply of electric power from a power source such as a dry battery to various detection and control circuits such as the flame detection circuit.

Therefore, in the standby state, since the various detection and control circuits such as the flame detection circuit are not energized, it is possible to reduce the consumption of the dry battery, and in the standby state, the flame detection circuit, etc. Since various detection and control circuits do not need to operate, there is no inconvenience in use.

[Brief description of drawings]

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

FIG. 2 is a flow chart illustrating an operating state of a control circuit of a gas device 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 Energization control circuit

Claims (2)

[Claims] 1. An ignition switch interlocked with an ignition operation, a water flow switch for detecting the presence or absence of water flow, and various detection and control circuits such as a flame detection circuit are connected to a microcomputer, and In a control circuit of a gas device that opens and closes a gas valve based on an output signal, a low power consumption mode when the microcomputer is in a standby state in which an ignition switch and a water flow switch are turned off, or an ignition switch is turned on When the ignition switch and the water flow switch are both turned on and the operation command state is reached, a function to return to operation is attached, and when the power is connected to the output side of the microcomputer and the low power consumption mode is entered, the energization is stopped and the operation is performed. An energization control circuit that energizes when restored is provided, and various types of power supplies such as dry batteries and flame detection circuits are provided through the energization control circuit. A control circuit for gas equipment, characterized in that a detection circuit and a control circuit are connected. 2. The control circuit for gas equipment according to claim 1, wherein the energization control circuit is a transistor switching circuit for controlling energization by switching the transistor in response to an output signal of the microcomputer.