JP2001280688A - Method for detecting trouble in safety pulse circuit of water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for detecting trouble in a safety pulse circuit of a water heater in which safety of the water heater can be secured, and the circuit can be simplified. SOLUTION: A condition of power source which is supplied through the safety pulse circuit to a gas solenoid-valve operation circuit is fed back to a microcomputer, safety pulses are switched on/off to judge whether or not any trouble exists in the circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a failure in a safety pulse circuit of a control device of a water heater, and more particularly to simplifying the circuit, and in particular, detecting a failure in the safety pulse circuit of the control device and ensuring safety in response to the failure. The present invention relates to a method for detecting a failure of a safety pulse circuit for a water heater that is suitable for improving the performance.

[0002]

2. Description of the Related Art A safety pulse circuit for supplying power to a gas solenoid valve drive circuit for a water heater uses a microcomputer to run out of control or to latch up, thereby shutting off the power supply to the gas solenoid valve drive circuit and causing an accident such as gas leakage. Although the safety pulse is always output from the microcomputer or the output of the safety pulse is ON / OFF while the power is supplied to the water heater, the failure judgment of the safety pulse circuit itself is performed. Had not been done.

[0003]

However, even if the safety pulse circuit breaks down and power remains supplied to the gas solenoid valve drive circuit, it is not possible to determine that a failure has occurred and the water heater can be safely stopped. Since it was not possible, it was necessary to ensure the safety of the water heater by, for example, duplicating the safety pulse circuit and preventing a dangerous state such as a gas leak accident.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to simplify a safety pulse circuit and to secure and improve safety without impairing usability of a water heater. It is to provide a circuit method capable of doing things.

[0005]

To achieve the above object, the present invention is characterized in that the safety pulse output is turned ON / OFF and the power supply detection circuit determines the power supply state, whereby the failure of the safety pulse circuit is prevented. Judgment can be made, and the circuit can be simplified.

According to a second aspect of the present invention, when the power is supplied even when the safety pulse is not output, it is determined that a failure has occurred, and the safety stop is performed. .

According to a third aspect of the present invention, when power is not supplied despite the output of the safety pulse, the safety pulse circuit is determined to be faulty and the safety stop is performed, thereby determining the fault of the safety pulse circuit. Is improved.

According to a fourth aspect of the present invention, a safety pulse is output only during a period when the operation switch of the remote controller is ON and power is supplied to the gas solenoid valve driving circuit, so that the safety of the water heater can be maintained without impairing usability. Nature can be secured.

According to a fifth aspect of the present invention, even when the operation switch of the remote controller is on, the safety pulse is temporarily stopped when the water heater is not burning and the safety pulse circuit is not burning, and the failure of the safety pulse circuit is determined. By doing so, safety is improved.

According to a sixth aspect of the present invention, the safety pulse can be stopped and the safety pulse can be output immediately after confirming that the power supply is turned off, thereby ensuring the safety without impairing the usability.

According to a seventh aspect of the present invention, the safety is improved by performing the failure determination of the safety pulse after the lapse of a fixed time period.

According to the present invention, the safety is improved by performing the failure judgment of the safety pulse circuit after the end of the combustion.

According to a ninth aspect of the present invention, safety can be ensured by performing a failure determination of the safety pulse circuit when a predetermined time has elapsed even during operation ON.

According to a tenth aspect, by turning off the output of the safety pulse during operation OFF, power is not supplied to the gas solenoid valve drive circuit, so that safety is improved without impairing usability.

According to the eleventh aspect, the power supply state is constantly monitored while the operation is OFF, and if the state where the power is not supplied continues, a safety pulse is output immediately when the operation is changed to ON, thereby impairing usability. Safety can be ensured.

According to a twelfth aspect of the present invention, the power supply state is constantly monitored while the operation is OFF, and when the power supply state is detected, the safety pulse ON failure is determined immediately after the operation is changed to the ON state. Safety can be ensured without impairing usability.

According to the thirteenth aspect, if it is determined that the safety pulse circuit has failed, the water heater is safely stopped, thereby ensuring safety.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to make the contents of the present invention easier to understand, the present invention will be described below with reference to embodiments.

[0019]

FIG. 1 is a block diagram of the present invention. A water heater main body 1 shown in FIG. 1 has a control board 2 for controlling combustion of the water heater therein.
, A gas solenoid valve 3 for supplying gas to the burner, a remote controller 9 for setting the temperature of the water heater, and the like. The gas solenoid valve 3 is opened and closed by a command from the control board 2,
Controls combustion. The water heater 1 can burn only during the period when the operation switch of the remote controller 9 is ON.

The control board 2 has a microcomputer 4 and a safety pulse circuit 5 capable of supplying power to the solenoid valve drive circuit block 7 while the safety pulse is being output from the microcomputer. A power supply state monitoring circuit block 6 that feeds back to the microcomputer 4 is provided. In the conventional system, the power supply state monitoring block 6 is not provided, and two safety pulse circuits 5 are provided to supply power to the solenoid valve drive circuit block 7.

This embodiment will be described with reference to FIG. The microcomputer 4 outputs a safety pulse, and the safety pulse circuit 5 outputs the following solenoid valve driving circuit 7 only during the period when the safety pulse is output.
The power supply state is monitored by a power supply state monitoring block 6, and the power supply state is fed back to the microcomputer 4. Here, the microcomputer 4 outputs a safety pulse while the operation switch of the remote controller 9 is ON, supplies power to the solenoid valve driving circuit 7, and checks the power supply state by a feedback signal from the power supply state monitoring block 6. When the power is not supplied despite the output of the safety pulse, the safety pulse circuit 5
Is determined to be a failure, and the water heater body is safely stopped. Further, even when the remote controller 9 is in operation ON, the safety pulse is temporarily stopped when the water heater 1 is in a non-combustion state, and the safety pulse circuit 5 is determined to be faulty. A pulse is output, and if an abnormality is detected, the operation stops safely.

When the SW of the remote controller 9 is turned off, the output of the safety pulse is stopped, and the fact that the power is not supplied is notified by the feedback signal of the power supply state monitoring block 6.
Monitoring is performed by the microcomputer 4, and if an abnormality is confirmed, a safety pulse is output again when the operation switch of the remote controller 9 is turned on to determine a failure, and if an abnormality is confirmed, an error is displayed from the remote controller 9, Stop the machine safely. Here, the failure determination is performed again. However, once a failure determination is made, an error may be displayed immediately and the vehicle may be safely stopped. The safety pulse is stopped to confirm that power is not supplied when the switch of the remote controller is turned off. However, when the water heater 1 is not burning, the safety pulse is not determined at any time. May be stopped and a failure determination may be made. Further, the number of failure determinations and the determination cycle may be arbitrarily set.

[0023]

According to the present invention, the following effects are exhibited by the above configuration. Since the power supply state can be monitored, there is no need to duplicate the safety pulse circuit, and the circuit can be simplified. In addition, since the power supply state can be monitored, the failure of the safety pulse circuit can be determined and the safety is improved.

[Brief description of the drawings]

FIG. 1 is an overall connection diagram of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water heater main body, 2 ... Control board which controls a hot water heater, 3 ... Gas solenoid valve which supplies gas to a burner, 4 ... Microcomputer mounted on control board 2 5 ... Safety pulse is output from microcomputer 4 Period
Safety pulse circuit capable of supplying power to the gas solenoid valve drive circuit 6 Power supply state monitoring circuit block for feeding back to the microcomputer 4 whether or not power is being supplied 7 Gas solenoid valve for driving the gas solenoid valve 3 Drive circuit block, 8 ... Power supply, 9 ... Remote control which can set temperature of water heater

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuji Tsujimaru 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka

Claims (13)

[Claims] A safety pulse circuit for supplying power to a gas solenoid valve drive circuit for driving the opening and closing of a gas solenoid valve during a period in which a safety pulse is output from a microcomputer; In the control device for a water heater having a power supply detection circuit capable of monitoring a power supply state, the output of the pulse is turned ON / OFF, and the power supply state is monitored by the power supply detection circuit to determine a failure of the safety pulse circuit. A method for detecting a failure of a water heater safety pulse circuit. 2. The method for detecting a failure in a water heater safety pulse circuit according to claim 1, wherein a failure is determined when the safety pulse is not output and power is supplied. . 3. The method for detecting a failure of a safety pulse circuit according to claim 1, wherein when the safety pulse is output and power is not supplied, a failure is determined. . 4. A remote controller which is connected to a control device of the water heater and which can remotely control the water heater, and outputs a safety pulse and supplies power only while the operation switch of the remote controller is ON. 4. The method according to claim 1, wherein
Safety pulse circuit failure detection method described. 5. Even during a period in which the operation switch of the remote controller is ON, when the water heater is not burning and is not burning,
5. The safety pulse circuit failure detection method according to claim 4, wherein the safety pulse is temporarily stopped to determine the failure of the safety pulse circuit. 6. The safety pulse circuit fault detecting method according to claim 1, wherein when the safety pulse is stopped, the safety pulse is output immediately after confirming that the power supply is turned off. 7. The safety pulse circuit failure detection method according to claim 1, wherein a failure determination of the safety pulse circuit is performed when a non-burning time of the water heater has elapsed for a predetermined time. 8. The safety pulse circuit failure detection method according to claim 1, wherein a failure determination of the safety pulse circuit is performed after the completion of combustion of the water heater. 9. Periodically during operation of the remote controller,
6. The safety pulse circuit failure detection method according to claim 4, wherein the failure of the safety pulse circuit is determined. 10. The safety pulse output is turned off while the operation of the remote controller is turned off.
Safety pulse circuit failure detection method described. 11. The power supply state is constantly monitored while the remote controller is turned off, and if the power is not supplied, a safety pulse is output immediately when the remote control is turned on. Item 10. The safety pulse circuit failure detection method according to any one of Items 1 to 10. 12. The power supply state is constantly monitored while the remote controller is off, and if a power supply state is detected, the safety pulse is kept stopped even after the operation is turned on, and the safety pulse is stopped again. 12. The safety pulse circuit failure detection method according to claim 1, wherein a failure determination of the safety pulse circuit is performed. 13. The water heater is safely stopped when it is determined that the safety pulse circuit has failed.
13. A method for detecting a failure of a safety pulse circuit according to any one of claims to 12.