JP3536702B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hot water supply device,
More specifically, the present invention relates to a technique for reducing the power consumption of a hot water supply device in a hot water supply standby state.

[0002]

2. Description of the Related Art In recent years, in the field of hot water supply devices, various functions such as a function of dropping hot water into a bathtub, a function of reheating a bath, a hot water heating function, and the like, as well as a function of supplying hot water to a curan or a shower. Is provided. On the other hand, the control technology of hot water supply temperature and hot water supply amount (water level control of bathtub hot water) has been advanced year by year, and furthermore, the above-mentioned functions and the like are realized, for example, a remote control device is used to improve user convenience. For this purpose, the number of components required for electrical components (for example, various sensors such as a water amount sensor and a flame detection circuit, and a remote control device installed in a bathroom or a kitchen) tends to increase.

[0003] By the way, the form of power supply (specifically, the structure of the control board) to the above-mentioned various electrical components in the hot water supply device which has recently made remarkable progress has been as shown in FIG. The configuration is suitably employed.

That is, the control board a shown in FIG.
A DC power supply (DC 15 V and DC 5 V in the illustrated example) supplied from a power supply board (not shown) is supplied as a drive power supply for the various electrical components. The supplied DC 5 V power is supplied to the water volume sensor b, the microcomputer c, and the communication interface i, and also supplied to the DC 5 V circuit d via the DC 5 V circuit d.
Other electrical components driven by a power supply of V (hereinafter, these electrical components are collectively referred to as "DC 5 V system load")
e. Similarly, a 15 V DC power supply supplied from a power supply board (not shown) is supplied to the remote control device f and the water volume sensor b, and also a 15 V DC circuit g.
And supplied to other electrical components (hereinafter referred to as a DC 15 V system load) h driven by another DC 15 V.

The power supply to the remote controller f is performed by a communication interface i provided in the control board a.
A so-called superimposed transmission method is adopted, and various signals for control can be transmitted and received between the remote controller f and the microcomputer c.

[0006]

However, in the power supply system having such a circuit configuration, the DC power supply (5 V, 15 V DC) supplied from a power supply board (not shown) can be operated by the hot water supply device either in operation or in standby. Even in the state, the electric power is supplied to all the electrical components. For example, when the operation switch of the remote control device f is in the off state, or even when the operation switch is in the on state, the hot water supply and the bath reheating are performed. Even when the hot water supply device is in a standby state, as in the case where there is no hot water supply (standby only), power is supplied to each circuit in the control board and electrical components connected thereto, so The power consumption by these electrical components is not small.

[0007] On the other hand, in order to suppress wasteful power consumption during the hot water supply standby, a circuit (power supply shutoff circuit) for interrupting power supply to these circuits and electrical components during the hot water supply standby may be provided. However, in equipment equipped with a combustion device such as a hot water supply device, it is not preferable in terms of device safety or performance to shut off power supply unconditionally and unlimitedly by such a power supply cutoff circuit, and it is necessary to consider such a point. Met.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a hot water supply apparatus capable of shutting off power supply to a circuit or a load that does not require power supply during hot water supply standby. Its primary purpose is to provide.
Further, in the present invention, it is another object of the present invention to ensure smooth and safe operation of the water heater.

[0009]

In order to achieve the above object, a water heater according to the present invention comprises: a power supply means for converting an AC power supply into a DC power supply as a drive power supply for various electric components;
DC power output from the power supply means and a power supply means for supplying a driving power source of the electrical component, said power supply means, branching into at least two systems or more power path DC power output supplied from said power supply means A power supply shutoff circuit configured to be capable of shutting off power supply on at least one of the branched power supply paths, and the hot water supply device is in a standby state on the power supply path provided with the power supply cutoff circuit. In addition to the electrical components that may shut off the power supply when the water supply device is connected, other electrical components that need to continue power supply even when the water heater is in a standby state are connected to the other power supply paths. The hot water supply, wherein the power supply
The supply means implements a microcomputer for controlling the operation state of the water heater.
And the power cutoff circuit
The power supply is cut off according to the operation state of the water heater by the output signal.
Combustion device configured to switch power supply
In the power cutoff circuit,
The timing of switching to energization is
It is assumed that a combustion command for the combustion section of the water heater is detected.
It is characterized by having.

That is, in the hot water supply apparatus according to the present invention, among various electric components which receive power supply from the power supply means of the hot water supply apparatus, the power supply may be stopped when the hot water supply apparatus is in a standby state. Since there are many electrical components without power supply, such electrical components that can cut off the power supply are provided with a power supply cutoff circuit on the power supply path to which DC power is supplied from the power supply means, and this circuit supplies hot water. The power supply during standby is cut off, and the power supply to unnecessary electrical components is cut off, thereby reducing the power consumption of the entire water heater.

[0011]

In such a hot water supply apparatus, the timing of switching from power supply cutoff to power supply energization in the power supply cutoff circuit is determined when the microcomputer detects a combustion command for the combustion section of the water supply apparatus. here,
As a specific case in which a combustion command is issued to the combustion unit, for example, when a hot water circulation device (bath circulation channel) is formed in the hot water supply device, the bath circulation channel may be used. Is detected, or when the minimum operating water flow required for combustion in the combustion section on the hot water supply path is detected (when MOQ is on).

By the way, electric components which do not require power supply when the water heater is in the standby state include a flame detecting circuit of a combustion part of the water heater. This flame detection circuit utilizes the rectifying action of the flame generated during combustion, and flows electricity between an electrode (frame rod) provided at the tip of the flame and a burner constituting the combustion section, and the flame is detected. The presence or absence of flame by detecting the presence or absence of rectification of the flame that occurs at the time,
That is, the configuration has been widely known as a device for detecting the presence or absence of combustion.

In such a conventional flame detection circuit,
Since the circuit includes a capacitive element, if the power supply is temporarily stopped by the above-described power supply cutoff circuit and then restarted (when the power supply is switched from the power cutoff state to the power supply state), the circuit is normal. There is a time delay before the operation starts. Therefore, when such a flame detection circuit is connected to the power shutoff circuit, the determination of the presence or absence of a flame is delayed at the time of hot water re-starting after standby for hot water supply. As a result, it is not possible to shift to the combustion mode, or the hot-water discharge characteristics at the time of hot water re-starting. Will be worsened.

Therefore, in order to solve such a problem,
In the present invention, when the flame detection circuit of the water heater is connected to the power cutoff circuit, the microcomputer sets the power cutoff circuit to the power cutoff state after a lapse of a predetermined time from the transition of the water heater to the standby state. It is constituted so that.

That is, if the power supply cutoff circuit immediately shuts off the power supply at the time of transition from the hot water supply state to the hot water supply standby state, the above-described problem occurs at the time of hot water supply again. By maintaining the power supply state until a predetermined time elapses after that, it is configured to be able to cope with the re-hot water during this time.

In such a flame detection circuit,
There is a so-called pseudo-flame problem. That is, since the flame detection circuit electrically detects the presence or absence of a flame, it may be determined that there is a flame on the circuit due to a circuit failure or the like even though the combustion part is not ignited. Furthermore, if the flame detection circuit is connected to the power cutoff circuit without solving the problem of the pseudo flame, when the combustion command is given and the power cutoff circuit is turned on, the flame is detected by the pseudo flame. The circuit may determine that there is a flame, in which case the ignition operation is stopped by the determination of the presence of a flame, which causes a serious safety problem such as release of raw gas without ignition of the combustion part. . As a method of solving such a problem of the pseudo flame, for example, when a combustion command is given and power supply to the flame detection circuit is started, the flame is waited until the flame detection circuit starts up, and the flame is generated in that state. It is also conceivable to shift to the ignition operation for the first time when no hot water is detected, but this is unfavorable because the hot water discharge characteristics at the start of hot water discharge are reduced.

Therefore, in the present invention, in order to solve such a problem, when the flame detecting circuit of the water heater is connected to the power cutoff circuit, the microcomputer shifts the water heater to a standby state, and It is preferable that the power cutoff circuit is configured to shift to the power supply energized state for a predetermined period of time at a predetermined cycle after the power cutoff circuit is set to the power cutoff state.

That is, when the hot water supply device is in the standby state, the power supply cutoff circuit is turned on in a predetermined cycle, and when it is determined that there is a flame in the power supply state at this time, it is determined that the above-described pseudo flame is present. I can judge. In other words, it is impossible for the hot water supply apparatus to have a flame despite being in the standby state due to the configuration of the apparatus. In such a case, it is possible to determine that the flame is a pseudo flame and to perform a predetermined alarm operation. . In this case, the power cutoff circuit is intermittently energized, and the energization time at that time is set to at least exceed the time required for the flame detection circuit to operate normally.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a hot water supply apparatus according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a block diagram showing a schematic configuration of a control board (power supply means) 1 for controlling the operation of each part of the hot water supply apparatus according to the present invention. Means 2 (see FIG. 3) supplies a DC 5V power supply and a DC 15V power supply.

More specifically, the control board 1 controls the operation of each part of the water heater and controls various electric components (water sensor A, remote controller B,
A power supply for supplying a driving DC power supply to a DC 15 V system load C, a DC 5 V system load D, etc., and power supply terminals X _{1 to} X ₃ connected to the power supply board 2, A microcomputer 3 for controlling an operation state, a power cutoff circuit 4,
A DC 15 V system circuit 5 and a DC 5 V system circuit 6 are configured as main parts.

In the illustrated example, reference numeral 7 denotes a communication interface for communication between the remote controller B and the microcomputer 3, and reference numeral 8 denotes a detection amount of the water sensor A by the remote controller B (communication interface). 7 shows an interface circuit for transmission.

A water amount sensor denoted by reference numeral A in the figure is a sensor for detecting the flow rate of hot water supplied from the hot water supply device, which is disposed on the hot water supply path of the hot water supply device. It is determined whether or not hot water that exceeds the minimum operation water flow (the minimum water flow required to operate the combustion unit of the hot water supply device) flows on the path. The remote control device B is a remote control device for remotely controlling the hot water supply device. The remote control device B is provided with various switches and a display unit for remotely controlling the hot water supply device.
Further, a DC 15 V system load indicated by reference symbol C and a DC 5 V system load indicated by reference symbol D are various electrical components (specifically, described later) connected to a DC 15 V system circuit 5 and a DC 5 V system circuit 6 described below. As described above, it is used as a general term for electrical components that can safely shut off the power supply when the water heater is in a standby state.

The power supply board 2 is connected to an AC power supply (commercial power supply) (not shown). The AC power supply is used as a power supply for driving various electric components of the hot water supply apparatus. ) And outputs the same, and the configuration is the same as that of a conventionally known power supply board.

[0026] Then, DC 15V power supply output from the power supply board 2 is supplied to the power supply terminal X _1, also DC 5V power source is supplied to the power supply terminal X ₂ and X _3. Specifically, the power supply terminal X ₁ is connected to the water flow sensor A, the communication interface 7 and the power supply cutoff circuit 4 via the branch point Y ₁ , whereby the power supply path of DC 15 V to each of the above-mentioned electrical components ( in the illustrated example DC 15V power source is branched to the power supply path of the three systems by the branch point Y ₁₎ is constructed. Similarly, the power terminal X ₂ is
Branching point Y ₂ of the communication interface 7 via are connected to the microcomputer 3 and the power supply cut-off circuit 4, thereby the DC 5V supply in the power supply path (illustrated example of DC 5V for each electrical component by the branch point Y ₂ 3 (Branched to the power supply path of the system). In addition, power supply terminal X ₃
Supplies power to the interface circuit 8.

By the way, the configuration of such a power supply path is as follows.
It is performed according to the following criteria.

That is, as described above, the electric components of each part of the hot water supply device require power supply even when the hot water supply device is in the standby state, and cut off the power supply when the hot water supply device is in the standby state. They are broadly divided into those that may be used.

For this reason, in the configuration of the power supply path, DC power is supplied via the power supply cutoff circuit 4 to electric components which may be cut off when the water heater is in a standby state. configured to, hot water supply apparatus of a DC power source directly from the respective power supply terminals X ₁ to X ₃ without using the power-off circuit 4 for electrical components that need to continue even power supply when in the standby state It is configured to be able to supply. Examples of electrical components that can shut off power supply when the hot water supply device is in a standby state include, for example, a fan motor drive circuit for supplying air, a water amount detection circuit that detects a bath drop flow rate, and the like.

On the other hand, the microcomputer 3 is a microcomputer for controlling each part of the hot water supply apparatus. In the present invention, the microcomputer 3 instructs the power cutoff circuit 4 to perform a power cutoff / power supply operation. A control signal (output signal) can be output.

The power supply cutoff circuit 4 is a circuit configured to be able to cut off the power supplied from the power supply board 2. The power supply cutoff circuit 4 is controlled by the control signal from the microcomputer 3.
The switching operation between the power cutoff and the power supply of the DC power input to the DC power supply is enabled.

Specifically, for example, a circuit as shown in FIG. 2 is employed as the power supply cutoff circuit 4. Power shutoff circuit 4 shown in Figure 2, shows the power cutoff circuit to cut off the power supply path of the DC 15V, together with the emitter terminal of the power source terminal X ₁ and a PNP transistor Tr is connected, the The collector terminal of the transistor Tr is connected to the DC 15 V circuit 5, and the base terminal of the transistor Tr is supplied with a control signal from the microcomputer 3. In FIG. 2, reference numeral 41 denotes an IC for driving the transistor Tr, and reference numeral R denotes a resistor.

The power supply cutoff circuit 4 is provided with a water heater.
Is in the operating state, the control signal from the microcomputer 3
Applies a voltage “Lo” to the base terminal via IC 41
And the transistor Tr is on (power supply is on)
It has been. And the water heater shifted to the standby state
In this case, the base signal is
The pressure is set to “Hi” and the transistor Tr is cut off
(Power cutoff state). In addition,
This power supply cutoff circuit 4 cuts off the DC 5V power supply path
If so, X₁Power supply terminal
Child X_Two(Branch point Y _Two) Is connected and DC 15
DC 5V system circuit 6 is connected instead of V system circuit 5
Needless to say.

FIG. 3 shows another embodiment of the power supply cutoff circuit 4. The power supply cutoff circuit of FIG. 3 is a case where a cutoff circuit of a 15 V DC power supply path is configured using a relay circuit instead of the transistor of FIG. In particular,
Constituted by the branch point Y ₁ and relay contact 42 provided between the DC 15V system circuit 5, a relay driving circuit 43 for driving the relay contact 42. Relay drive circuit 43
Is composed of a relay body 43a and a relay driving IC 43b, and a control signal from the microcomputer 3 is transmitted to the relay driving IC 43b.
The relay contact 42 is configured to open and close by being supplied to 43b. The diode indicated at 44 in the figure is a current feedback diode at the time of the relay contact 42 is turned off, also by the relay body 43a is connected to the branch point Y _1, relay body 4
A power of 15 V DC is always supplied from the power supply board 2 to 3a.

In the power supply shut-off circuit shown in FIG. 3, when the water heater is in the operating state, the relay contact 42 is short-circuited (power supply) by the control signal from the microcomputer 3 as in the case of FIG. (Water supply state), and when the water heater 3 is in a standby state, the relay contact 42 is controlled to be in an open state (power cutoff state). In the case of interrupting the power supply path of the DC 5V power supply cutoff circuit of FIG. 3, the branch point Y ₂ and DC 5V
It is configured that a relay contact 42 is arranged between the system circuit 6.

The DC 15 V system circuit 5 is a circuit for supplying DC power to the above-described DC 15 V system load C. Similarly, the DC 5 V system circuit 6 is provided with the DC 5 V system load D. 1 shows a circuit for supplying a DC power supply. Each of these circuits 5 and 6 is connected to the respective power supply terminals X _{1 and} X ₂ via the power supply cut-off circuit 4 described above.

The communication interface 7 is a communication interface for communication between the remote controller B and the microcomputer 3 as described above, and is connected to the power supply line between the remote controller B and the remote controller B by the communication interface 7. So-called superimposed transmission in which a control signal is superimposed is performed. The coil indicated by the symbol L in the figure is an AC blocking coil for preventing a control signal for a remote controller from flowing around the power supply board 2.

In the control board 1 thus configured, the hot water supply device is in a hot water supply standby state, in other words, the operation switch of the remote control device B is turned off,
Alternatively, when the operation switch is on but the hot water supply (or reheating of the bath) is stopped (specifically, the amount detected by the water amount sensor A is less than the minimum operation water amount,
Or, when the circulation of hot water in the bath circuit is stopped),
This state is detected by the microcomputer 3 based on signals from sensors for detecting these states.

When the hot water supply apparatus shifts to the hot water supply standby state, the microcomputer 3 interrupts the power supply to the DC 15 V system circuit 5 and the DC 5 V system circuit 6 with respect to the power cutoff circuit 4. The control signal causes the power cutoff circuit 4 to shift to a power cutoff state, and the DC 15V system circuit 5 and the DC 5
The power supply to the V-related circuit 6 is cut off.

As a result, no DC power is supplied from the power supply board 2 to the DC 15 V system load C and the DC 5 V system load D connected to the DC 15 V system circuit 5 and the DC 5 V system circuit 6. Power consumption by these loads C and D is suppressed. On the other hand, electrical components that require power supply even when the hot water supply device is in a standby state, that is, in the illustrated example, the microcomputer 3 and the communication interface 7
(And the remote controller B connected thereto) and the interface circuit 8 (and the water amount sensor A connected thereto) are constantly supplied with power from the power supply board 2. Normal operation is continued even at times.

The operation of restoring the power supply when the power supply is cut off in this way will be described below.

The restart of power supply in the power supply cutoff circuit 4 is executed when the water heater shifts from the standby state to the operating state. That is, the transition of the hot water supply device to the operating state is as follows.
For example, when the operation switch of the remote control device B is turned on and water is detected on the hot water supply path at a flow rate equal to or greater than the minimum operating water flow amount, or the bath reheating switch of the remote control device B is turned on, and the bath reheating device is turned on. A command from the microcomputer 3 is issued by detecting the circulation of hot and cold water on the circulation path. That is, in such a case, the hot water supply device issues a combustion command to the combustion section, and the transition to the operation state is executed by detecting the combustion command.

When the microcomputer 3 detects the combustion command, a control signal for restarting power supply to the power supply cutoff circuit 4 is output, contrary to the power supply cutoff operation described above. As a result, the power cutoff circuit 4 shifts to the energized state. As a result, the power supply to the DC 15 V system circuit 5 and the DC 5 V system circuit 6 is restarted, and the power supply to the electrical components connected to these circuits is restarted.

As described above, in the hot water supply apparatus of the present invention, even when the hot water supply apparatus is in a standby state, the operation of the hot water supply apparatus can be monitored and controlled, and the electric equipment for remotely operating the hot water supply apparatus can be controlled. On the other hand, since the power supply is continued, when the water heater returns from the standby state to the operating state, the power supply cutoff circuit 4 can be promptly shifted to the energized state. Then, the operation can be resumed and the operation can be continued.

When a flame detection circuit is connected to the power supply cutoff circuit 4 in the hot water supply apparatus configured as described above, there are problems of hot water discharge characteristics at the time of hot water re-start and pseudo flame as described above. In connection, it is preferable to adopt a configuration different from the case of ordinary electrical components. The configuration of this flame detection circuit is shown in FIG. 4, and the specific configuration will be described below.

FIG. 4 shows the structure of the flame detection circuit.
The flame detection circuit determines the presence or absence of combustion by detecting the rectifying action of the flame, and includes a flame detection IC (frame rod) 9 and a frame rod body 10.
The flame detection IC 9 in the illustrated example is conventionally known, and is provided with a power supply cutoff circuit from the power supply board 2 (for the flame detection circuit, a separate power supply cutoff circuit independent of the other electrical components is provided). 4 receives a power of 15 V DC supplied through an AC power supply 4 and receives an AC 10 V by an internal oscillation circuit (not shown).
0F is applied, and this AC 100V is applied to the frame rod body 10.
The detection result at C9 is input to the microcomputer 3.

In the drawing, reference numeral E denotes a combustion portion (burner) of the hot water supply device, and reference numeral F denotes a burner flame. Further, in the illustrated example, reference numeral 11 denotes a water flow switch detection circuit for detecting a water flow circulating in the bath circulation path at the time of bath reheating, and the water flow switch detection circuit 11 is a water flow switch provided in the bath circulation path. Is connected to Although FIG. 4 shows a case where a water flow switch detection circuit is connected to the microcomputer 3, the microcomputer 3 includes a water flow detection circuit for detecting the flow rate of water flowing in the hot water supply path and a water flow detection circuit as shown in FIG. Sensor A is also connected.

However, in the flame detection circuit, when the water heater is in the standby state as described above, the microcomputer 3
Power supply cutoff circuit 4 by control signal from
In this case, the power supply to the power supply 9 is interrupted. In this case, the water heater shifts to a standby state (specifically, when the microcomputer 3 confirms that the microcomputer 3 has turned off the MOQ or stopped the circulation in the bath circulation path) (for example, After the elapse of 5 minutes), the microcomputer 3 outputs a control signal to the power cutoff circuit 4 to instruct power cutoff.

That is, if the power supply is shut off immediately after the hot water supply apparatus shifts to the standby state, the hot water supply characteristic at the time of re-starting hot water deteriorates as described above. Therefore, in this embodiment, the hot water supply apparatus shifts to the standby state. It is configured to supply power only for a certain period of time. At this time, how long the predetermined time is set can be freely selected as appropriate,
Even if it is set for an excessively long time, the can body temperature will decrease. Therefore, it is preferable to set the time such that the can body temperature does not decrease.

Further, in the present embodiment, after the power cutoff circuit 4 shifts to the power cutoff state, the power cutoff circuit 4 is shifted to the power supply state for a predetermined period of time at a predetermined period.

The reason why the power supply is intermittently switched to the power-on state after the power is turned off is to eliminate the problem of the pseudo flame in the flame detection circuit. That is, in the present embodiment, the flame detection circuit is periodically started temporarily by shifting to the energized state intermittently as described above. If a flame is detected by this circuit at this time, a pseudo flame That is, it can be determined that the flame detection circuit has failed. This is because no flame is detected when the hot water supply device is in the standby state, and it is considered that a failure is detected by the flame detection circuit in this state to determine that there is a flame.

Therefore, if the microcomputer 3 determines that there is a flame when the flame detection circuit is intermittently energized as described above, in that case, the failure is determined according to a predetermined alarm procedure provided in the water heater. Is displayed, a warning sound is transmitted, and the like.

As described above, the flame detection circuit is connected to the independent power supply cut-off circuit 4 which is different from the above-mentioned normal electric components,
Accordingly, by performing unique control on the power supply cutoff circuit 4, it is possible to solve the problem of the hot water discharge characteristic and the problem of the simulated flame.

The above-described embodiment shows a preferred embodiment of the present invention, and the present invention is not limited to the above-described embodiment, and various design changes can be made within the scope of the present invention. is there.

For example, in the above embodiment, the power supply board 2
The water supply sensor A, the remote control device B, the microcomputer 3 and the like are described as electrical components directly supplied with power from the power supply board 2, but these other electrical components are also directly transmitted from the power supply board 2 without passing through the power cutoff circuit 4. It is also possible to configure so as to receive power supply. For example, when the hot water supply device is provided with an ambient temperature detection circuit for preventing freezing, power can be supplied without passing through the power supply cutoff circuit 4. In the case of this ambient temperature detection circuit,
Similar to the above flame detection circuit, a separate power supply cutoff circuit 4
May be provided to supply power periodically.

Further, in the above embodiment, the DC voltage is 15 V,
Although a configuration is adopted in which all the power supply paths of DC 5 V are branched into three systems in the branch path Y, the number thereof can be changed as appropriate according to the number and type of the electrical components to be connected. Also, in the example shown in FIG. 1, the configuration in which only one system is connected to the power cutoff circuit 4 for both the 15 V DC and 5 V DC power paths is shown.
It is also possible to connect to.

[0057]

As described above in detail, according to the hot water supply apparatus of the present invention, the power supply means branches the DC power output supplied from the power supply means into at least two or more power supply paths. A power supply cutoff circuit is provided on at least one of the branched power supply paths, and power supply to the power supply path provided with the power supply cutoff circuit may be cut off when the water heater is in a standby state. Since the electrical components are connected, the electrical supply that does not require power supply when the hot water supply device is in the standby state can be cut off by the power cutoff circuit, so that the power consumption by these electrical components can be reduced. It is possible to suppress the total power consumption of the hot water supply device during the hot water supply standby state to be smaller than before.

In addition, for electric components whose power supply is desired to be cut off during the standby state of the hot water supply device, the power supply can be easily cut off through the above-mentioned power cutoff circuit. The degree of freedom is high, and various types of hot water supply devices provided today can be widely supported in consideration of the form and function.

In the flame detection circuit, the power supply is cut off after a predetermined time has elapsed after the hot water supply apparatus has shifted to the standby state, and after the power supply is cut off, the power supply state is shifted to the power supply state for a predetermined time in a predetermined cycle. Therefore, there is no decrease in the tapping characteristics at the time of tapping again, and furthermore, the danger such as generation of raw gas due to the simulated flame can be avoided, which is advantageous in terms of safety measures for the apparatus.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a control board in a hot water supply apparatus according to the present invention.

FIG. 2 is a circuit configuration diagram showing an example of a power cutoff circuit of the control board.

FIG. 3 is a circuit configuration diagram showing another example of the power cutoff circuit of the control board.

FIG. 4 is a schematic block diagram showing an example of a case where a flame detection circuit is mounted on the control board.

FIG. 5 is a block diagram showing a configuration of a control board in a conventional hot water supply apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Control board (power supply means) 2 Power supply board (power supply means) 3 Microcomputer 4 Power cutoff circuit 5 DC 15 V system circuit 6 DC 5 V system circuit 7 Communication interface 8 Interface 9 Flame detection IC (Flame detection circuit) 10 Frame rod body A Water flow sensor B Remote control device C DC 15 V system load D DC 5 V system load X _{1 to} X ₃ Power supply terminals Y _1, Y ₂ Branch point

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoru Matsumura 93 Edocho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Hironobu Fujii 93rd Edocho, Chuo-ku, Kobe-shi, Hyogo Pref. 72) Inventor: Toyoya Shindo 93, Edo-cho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd. (56) References JP-A-4-240350 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/10 301 F24H 1/00 602

Claims (5)

(57) [Claims] 1. A power supply means for converting an AC power supply into a DC power supply as a drive power supply for various electrical components and outputting the DC power supply, and a power supply means for supplying a DC power output from the power supply means as a drive power supply for the electrical components. The power supply means branches the DC power output supplied from the power supply means into at least two or more power supply paths, and can shut off power supply on at least one of the branched power supply paths A power supply circuit which may cut off the power supply when the hot water supply device is in a standby state is connected to a power supply path provided with the power supply cutoff circuit. The power supply path is a hot water supply device to which electric components that need to continue power supply even when the hot water supply device is in a standby state are connected , wherein the power supply unit is in an operating state of the hot water supply device. Control my
The power cutoff circuit
The power is supplied according to the operation status of the water heater by the output signal of the icon.
It is configured to switch between power supply cutoff / power supply
In the combustion device, switching from power cutoff to power supply energization in the power cutoff circuit.
The replacement timing is the time when the microcomputer
A hot water supply apparatus characterized in that it is determined when a combustion command to the combustion section is detected . 2. An AC power source is used as a power source for driving various electrical components.
Power supply means for converting the power to DC power and outputting
Supply the DC power output from the stage as drive power for electrical components
Power supply means, wherein the power supply means
DC power output from the power source means at least two systems
Branch into the above power supply path,
Power supply can be cut off on at least one of the source paths
Power supply shut-off circuit
The hot water supply device is on standby in the power path provided with the circuit.
Electrical components that may shut off the power supply when connected
At the same time, the hot water supply unit is on standby in other power paths
Electrical equipment that needs to be continuously powered even when
A hot water supply device, wherein the power supply means controls an operation state of the hot water supply device.
The power cutoff circuit
The power is supplied according to the operation status of the water heater by the output signal of the icon.
It is configured to switch between power supply cutoff / power supply
In the combustion device, a flame detection circuit of a hot water supply device is connected to the power cutoff circuit.
If the water heater is in standby mode,
After a lapse of a predetermined time from the shift, the power cutoff circuit is turned on.
Characterized in that it is configured to be in a cutoff state
Water heater. 3. An AC power source is used as a power source for driving various electrical components.
Power supply means for converting the power to DC power and outputting
Supply the DC power output from the stage as drive power for electrical components
Power supply means, wherein the power supply means
DC power output from the power source means at least two systems
Branch into the above power supply path,
Power supply can be cut off on at least one of the source paths
Power supply shut-off circuit
The hot water supply device is on standby in the power path provided with the circuit.
Electrical components that may shut off the power supply when connected
At the same time, the hot water supply unit is on standby in other power paths
Electrical equipment that needs to be continuously powered even when
A hot water supply device, wherein the power supply means controls an operation state of the hot water supply device.
The power cutoff circuit
The power is supplied according to the operation status of the water heater by the output signal of the icon.
It is configured to switch between power supply cutoff / power supply
In the combustion device, a flame detection circuit of a hot water supply device is connected to the power cutoff circuit.
If the water heater is in standby mode,
By shifting, the power cutoff circuit is set to the power cutoff state.
After that, the power cutoff circuit is turned on for a certain period of time at a predetermined cycle.
It is configured to shift to the power supply energized state.
Hot water supply device. 4. The power supply cutoff circuit is in the form of a transistor interposed on a power supply path, and the transistor is turned on / off by an output signal from the microcomputer, thereby switching between power supply cutoff and power supply. 4. The method according to any one of claims 1 to 3, wherein
Water heater. 5. The power supply cutoff circuit is in the form of a relay contact interposed on a power supply path, and a power supply cutoff is performed by controlling a relay drive circuit for driving the relay contact by an output signal from the microcomputer. 4. The method according to claim 1 , wherein switching of power supply is performed.
A hot water supply device as described in Crab.