JP6862783B2 - Hot water supply device with sterilization function - Google Patents

Description

The present invention relates to a hot water supply device with a sterilization function.

For example, as disclosed in Patent Document 1 below, conventionally, in a hot water supply device with a bath reheating function, a disinfectant lamp (sterilization lamp) such as a UV lamp is provided in the middle of a reheating circulation hot water supply channel to follow up. Some sterilize the hot water flowing through the reheating circulation hot water supply channel by turning on the germicidal lamp during the burning operation. That is, in the embodiment disclosed in FIG. 2 of Patent Document 1, a germicidal lamp drive circuit is connected to a control microcomputer (CPU) that controls hot water supply via an input / output interface (I / O), and a command from the control microcomputer is given. The germicidal lamp can be turned on and operated, and the germicidal lamp drive circuit detects the disconnection of the germicidal lamp and outputs the disconnection detection signal to the control microcomputer.

Japanese Unexamined Patent Publication No. 9-126556

By the way, a configuration in which the drive power of the disinfectant lamp is generated and output by an inverter circuit is also well known (for example, Japanese Patent No. 3741491), but the inverter circuit is mounted on the same substrate as the control unit that controls the hot water supply. Therefore, if the operation command is issued from the control microcomputer, noise associated with high frequency switching in the inverter circuit may be propagated to the control microcomputer, which may adversely affect the hot water supply control operation.

In addition, some models are equipped with a disinfectant function and some are not equipped with a disinfectant function. However, if an inverter circuit for a disinfectant lamp is mounted on a control board or power supply board, some models do not have a disinfectant function. It occupies an unnecessary board area, and if the board is standardized, it will hinder the miniaturization of the device of the model that does not have the sterilization function. It becomes impossible to reduce the amount.

Therefore, the first object of the present invention is to suppress the influence of noise generated by the operation of the disinfectant lamp drive circuit on the control operation even when the disinfectant lamp drive circuit is mounted. A second object of the present invention is to provide an apparatus configuration capable of flexibly adding a sterilization function.

In order to achieve the above object, the present invention has taken the following technical measures.

That is, the hot water supply device with a sterilization function of the present invention drives the sterilization lamp when the hot water supply passage, the sterilization lamp provided in the middle of the hot water supply passage, and the sterilization lamp drive command signal are supplied. A sterilization lamp drive circuit that generates driving power for the sterilization lamp and outputs the sterilization lamp to the sterilization lamp, a control unit that outputs the sterilization lamp drive command signal, and the sterilization lamp drive command signal from the control unit. The command signal transmission means is provided with a command signal transmission means for transmitting to the sterilization light drive circuit, and the command signal transmission means transmits the sterilization light drive command signal while electrically insulating the control unit and the sterilization light drive circuit. It is characterized by having an insulating portion for transmitting from the control unit side to the disinfectant lamp drive circuit side (claim 1).

According to the hot water supply device with a sterilization function of the present invention, the sterilization light drive command signal can be transmitted from the control unit to the sterilization light drive circuit while electrically insulating the control unit and the sterilization light drive circuit. Therefore, it is possible to suppress the propagation of electrical noise caused by the generation of the disinfectant lamp drive power in the disinfectant lamp drive circuit to the control unit, and reduce the influence on various other control operations in the control unit. it can.

The control unit is preferably mainly composed of a microcomputer (microcomputer) and may control the hot water supply operation from the hot water supply path. When the hot water supply operation is performed, a disinfection light drive command is given from a predetermined output port. It can be configured to output a signal. Further, the hot water supply channel in the present invention is preferably a reheating hot water supply channel for reheating and heating the hot water in the bathtub, but is a hot water supply channel for a hot water tap or a hot water supply channel for dropping hot water into the bathtub. There may be. Further, the disinfectant lamp is preferably composed of a UV lamp, the driving power thereof may be high frequency to low frequency AC power, and the disinfectant lamp drive circuit is typically mainly composed of an inverter circuit.

In the hot water supply device with a sterilization function of the present invention, the control unit is mounted on a control board, and the sterilization light drive circuit is mounted on a sterilization light drive board different from the control board to control the control. The substrate has a control power supply line, the insulating portion is composed of a photocoupler mounted on the disinfectant lamp drive substrate, and the drive voltage of the built-in light emitting element of the photocoupler is supplied from the control power supply line. not good have been so that configuration. According to this, the disinfectant lamp drive command signal can be transmitted from the control board to the disinfectant lamp drive board in the mode of whether or not to supply the drive voltage to the built-in light emitting element of the photocoupler, and the built-in light emitting element of the photocoupler and Since the drive voltage supply line connected to the element is electrically isolated from the disinfectant lamp drive circuit by the photocoupler on the disinfectant lamp drive substrate, electricity generated due to the generation of the disinfectant lamp drive power is generated. It is possible to prevent the noise from being propagated to the control board. Further, when the sterilization function is not required, it is not necessary to provide the sterilization light drive board, and it is possible to flexibly configure the device whether or not to add the sterilization function, and when the sterilization light drive board is not provided. Can also divert the drive voltage output unit to the built-in light emitting element of the photocoupler as a voltage output unit to another substrate or device, further improving the flexibility of device design.

Further, a first power supply unit for the control unit and a second power supply unit for the disinfectant lamp are further provided, and the second power supply unit includes an isolated converter that generates DC power from commercial AC power. The sterilization lamp drive circuit includes an inverter that generates the drive power from the DC power generated by the isolation converter, and a sterilization lamp ON / OFF circuit, and is a power source for the switching element that constitutes the inverter. The voltage may be supplied from the isolated converter via the sterilization lamp ON / OFF circuit, and the sterilization lamp drive command signal may cause the sterilization lamp ON / OFF circuit to be electrically operated. No. According to this, by providing the second power supply unit for the disinfectant lamp separately from the first power supply unit for the control unit, the noise generated in the disinfectant lamp drive circuit via the power supply unit is transmitted to the control unit. It can be avoided to be propagated. Further, the disinfection light ON / OFF circuit conducts the power supply voltage supply path when the disinfection light drive command signal is supplied, and connects the power supply voltage supply path when the disinfection light drive command signal is not supplied. By providing a disinfectant lamp ON / OFF circuit in the power supply voltage supply path for the switching element that constitutes the inverter, instead of the DC power supply path for the drive power of the disinfectant lamp, the disinfectant lamp is cut off. Even when the DC power for the driving power of the inverter is a relatively large voltage such as 100V, the power supply voltage for the switching element is a relatively small voltage of about 10 to 20V, so that the withstand voltage performance of the insulating portion is low. This makes it possible to further improve reliability and reduce component costs.

Further, the first power supply unit is mounted on a substrate different from both the control unit and the sterilization lamp drive circuit, and the second power supply unit is the same substrate as the sterilization lamp drive circuit (sterilization lamp drive substrate). It not good is mounted on the top. According to this, the addition or deletion of the sterilization function can be flexibly and easily performed depending on whether or not the sterilization lamp drive substrate is provided.

Further, the disinfection light drive circuit further includes a disconnection detection circuit that outputs a disconnection detection signal according to the energized state of the disinfection lamp, and the disconnection detection signal is the disconnection detection circuit via a detection signal transmission means. The detection signal transmission means controls the disconnection detection signal from the disconnection detection circuit side while electrically insulating the control unit and the disinfectant lamp drive circuit. Ru can have an insulating portion for transmitting to the parts side. According to this, even when a disconnection detection circuit for the disinfectant lamp is provided, noise is propagated from the disinfectant lamp drive circuit to the control unit via the detection signal transmission means for transmitting the disconnection detection signal to the control unit. Can be suppressed.

As described above, according to the present invention, even when the disinfectant lamp drive circuit is mounted, the influence of noise generated by the operation of the disinfectant lamp drive circuit on the control operation can be suppressed and eliminated. The device configuration can be such that the fungal function can be flexibly added.

It is an operation principle figure of the hot water supply apparatus with a sterilization function which concerns on one Embodiment of this invention. It is a circuit block diagram which shows the main part of the control part, the sterilization lamp drive circuit, and the power-source part of the hot water supply device.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a hot water supply device 1 with a sterilization function according to an embodiment of the present invention, in which the hot water supply device 1 is a main hot water supply channel that realizes a hot water supply function to a hot water tap using purified water such as tap water as a water supply source. 2. Reheating hot water supply channel that realizes the reheating hot water supply function that reheats the hot water in the tub using the hot water in the tub as the water supply source and then returns it to the tub. It is provided with a hot water supply channel 4 for pouring hot water to supply hot water to the reheating hot water supply channel 3. Since the configurations and operations of the main hot water supply passage 2 and the hot water supply passage 4 for pouring are well known in the past, detailed description thereof will be omitted.

The reheating hot water supply path 3 is mainly composed of a return path 6 and an outward path 7 piped between the circulation adapter of the bathtub (not shown) and the reheating heat exchanger 5 in order to realize the reheating function. It is composed of a circulation circuit, and the bathtub hot water filled in the bathtub can be reheated to a predetermined temperature and heated. That is, the operation of the circulation pump 8 supplies the reheating heat exchanger 5 from the tub through the return path 6, and the tub hot water is heated by the reheating heat exchanger 5 by the combustion heat generated by the combustion burner 9. It is configured to be exchange-heated and reheated, and the hot water after reheating is returned to the bathtub via the outward path 7, and is reheated until the temperature of the hot water passing through the return path 6 reaches a predetermined target temperature. It has become. The circulation pump 8 is interposed in either the return path 6 or the outbound path 7 (return path 6 in the illustrated example). The return path 6 is provided with a water flow switch 10 that detects the flow and outputs a detection signal to the microcomputer 20 (control unit) described later, and a return temperature sensor 11 that detects the temperature of the bathtub hot water passing through the return path 6. Has been done. The outbound route 7 is provided with an outbound temperature sensor 12 that detects the temperature of hot water after reheating.

Further, a UV unit having a built-in UV lamp 18 (sterilization lamp) is provided in the middle of the return path 6, and the bathtub hot water is emitted by the ultraviolet rays emitted by the UV lamp 18 when the bathtub hot water passes through the UV unit. Can be sterilized.

Reference numeral 13 in FIG. 1 is a gas supply pipeline for supplying fuel gas to the hot water supply combustion burner 14 and the reheating combustion burner 9, and the gas supply pipeline 13 has a source gas electromagnetic valve. Multiple capacities for switching the combustion capacity of the SV, the gas proportional valve 15, the reheating electromagnetic valve 16 for switching whether or not to supply fuel gas to the reheating combustion burner 9, and the hot water supply combustion burner 14. A switching valve 17 is provided.

Further, the hot water supply device 1 of the present embodiment includes a microcomputer 20 (microcomputer) as a control unit for controlling each hot water supply operation by the main hot water supply passage 2, the reheating hot water supply passage 3, and the hot water supply passage 4 for pouring. There is. The microcomputer 20 is mounted on the control board B1, and although not shown on the control board B1, various sensors including the water flow switch 10, the return temperature sensor 11, and the forward temperature sensor 12, a circulation pump 8, and a source gas solenoid valve are used. Input / output interface circuits for various actuators including an SV, a proportional valve 15, a reheating solenoid valve 16, and a capacity switching valve 17 are mounted.

Further, the hot water supply device 1 generates drive power for driving the power supply unit P1 (first power supply unit) and the UV lamp 18, and outputs the drive power to the UV lamp 18 via the wire harness W (UV controller substrate B2 (1st power supply unit). A sterilization lamp drive board) is provided as a unit separate from the control board B1, and commercial AC power is supplied to the power supply unit P1 and the UV controller board B2 as a main power source via an earth leakage breaker 19. ..

FIG. 2 shows the main parts of the circuit configuration of the power supply unit P1, the control board B1 and the UV controller board B2. The power supply unit P1 may have an appropriate power supply circuit configuration known in the past, but is typically configured by an isolated converter. In the illustrated example, a constant voltage controlled 15V DC voltage is supplied from the power supply unit P1 to the control power supply line VC15 on the control board B1 as a control power supply voltage. The power supply board of the power supply unit P1 can be configured separately from both the control board B1 and the UV controller board B2.

A control power supply line VC5 to which a 5V DC voltage is supplied is also mounted on the control board B1, and the 5V DC voltage supplied to the control power supply line VC5 is the above 15V DC voltage supplied by the three-terminal regulator 21. Although it is generated on the control board B1 by conversion, the power supply unit P1 can also be configured to generate a 5V DC voltage and supply it to the control power supply line VC5. Further, the ground C-GND of the control board B1 is wired and connected to the ground terminal of the power supply unit P1.

On the UV controller substrate B2, a second power supply unit P2 composed of an isolated converter (preferably a flyback converter) that generates 100V DC power controlled by a constant voltage from commercial AC power, and the 100V DC power are removed from the above. A sterilization lamp drive circuit 22 that generates and outputs the fungus lamp drive power is mounted.

The isolated converters constituting the second power supply unit P2 are provided on the transformer 23, the noise filter 24 provided on the primary side of the transformer 23, the rectifying smoothing circuit 25 and the switching circuit 26, and the secondary side of the transformer 23. It is provided with a secondary side circuit 27. The secondary circuit 27 has an output constant voltage control function, and outputs constant voltage controlled 100 V DC power. Further, the circuit is configured so that the feedback signal is transmitted from the secondary side circuit 27 to the primary side switching circuit 26 via the photocoupler 28 while being electrically isolated. Further, the secondary side circuit 27 outputs a DC15V voltage that is not controlled by a constant voltage. This DC15V voltage may be the output voltage in the middle of winding of the transformer 23 as it is. In addition, on the UV controller board B2, P-GND which is the ground of the primary side of the isolated converter P2 and S-GND which is the ground of the secondary side are separately provided, and the output voltage of the secondary circuit 27 is provided. Is output as a voltage with the secondary side ground S-GND as a reference potential.

The disinfectant lamp drive circuit 22 is mainly composed of an inverter 30 that converts and outputs high-frequency to low-frequency disinfectant lamp drive power (AC power) from the 100 V DC power. The inverter 30 typically outputs an inverter bridge formed by connecting a plurality of switching elements in a bridge, an inductor provided on the output side of the inverter bridge, and a drive pulse signal PWM-controlled by the switching element. It is configured to include a conversion control unit. The power supply voltage for the operation of the conversion control unit of the inverter 30 (power supply voltage for the switching element constituting the inverter) is also required separately from the above 100V DC power, but in the present embodiment, the DC15V output of the secondary side circuit 27 Is converted and output to a 12V power supply voltage via a sterilization lamp ON / OFF circuit 31 and a constant voltage control circuit 32 (three-terminal regulator, etc.), and the 12V power supply voltage is supplied to the inverter 30 as a power supply voltage for conversion control operation. It is configured as follows.

The disinfectant lamp ON / OFF circuit 31 can be configured by an appropriate switching element such as a transistor, and when a disinfectant lamp drive command signal is supplied from the microcomputer 20 on the control board B1, the disinfectant lamp drive operation is performed and the disinfectant lamp is driven. It is configured to shut off when the command signal is not supplied.

The microcomputer 20 receives a sterilization operation command from the outside, and while the hot water circulation of the reheating hot water supply path 3 is being performed, the sterilization light drive for driving the sterilization light from a predetermined output port. It is configured to output a command signal, and the sterilization light drive command signal is transmitted to the sterilization light ON / OFF circuit 31 of the sterilization light drive circuit 22 via the command signal transmission means. The command signal transmission means may change the state of the signal during signal transmission as long as the command content can be retained. For example, the alternative command signal for driving the disinfectant lamp is (driving = High signal, not driving = Low signal), (driving = Low signal, not driving = High signal), ( Command in various signal states such as drive = pulse signal, not drive = constant potential), (drive = voltage supply, not drive = voltage supply not), (drive = LED on, not drive = LED off) It may indicate the content.

In the middle of the command signal transmission means, an insulating portion that electrically insulates the microcomputer 20 and the disinfectant lamp drive circuit 22 and transmits a disinfectant lamp drive command signal from the control unit side to the disinfectant lamp drive circuit side. In this embodiment, the insulating portion is composed of a photocoupler 33 mounted on the UV controller substrate B2. The drive voltage of the built-in light emitting element 33a of the photocoupler 33 is configured to be supplied from the control power supply line VC15 of the control board B1. That is, the control board B1 includes a voltage external output terminal a connected to the control power supply line VC15 and a ground external connection terminal b connected to the ground C-GND of the control board B1 via the switching element Q1. When the high signal is output from the microcomputer 20 as the disinfectant light drive command signal, the switching element Q1 conducts and supplies a voltage between the terminals a and b, and when the disinfectant light drive command signal is not output (microcomputer 20 output). (When the output is Low), the switching element Q1 is cut off and the terminal b is opened, so that the voltage supply between the terminals a and b is not performed.

On the other hand, the UV controller board B2 is provided with a connection terminal c connected to the positive side of the built-in light emitting element 33a of the photocoupler 33 and a connection terminal d connected to the negative side of the built-in light emitting element 33a. The terminal a of B1 and the terminal c of the UV controller board B2, and the terminal b of the control board B1 and the terminal d of the UV controller board B2 are connected by wiring, respectively.

Therefore, when the microcomputer 20 outputs a High signal as a sterilization lamp drive command signal, the switching element Q1 conducts and a drive voltage is supplied to the built-in light emitting element 33a of the photocoupler 33, whereby the built-in light receiving element of the photocoupler 33 is supplied. 33b (phototransistor) is conducted, and the disinfectant lamp drive command signal input unit of the disinfectant lamp ON / OFF circuit 31 is conducted to the secondary side ground S-GND of the UV controller board B2, whereby the Low signal is removed. It is input to the sterilization lamp ON / OFF circuit 31 as a sterilization lamp drive command signal (a signal indicating that the sterilization lamp is driven). Further, when the microcomputer 20 outputs a Low signal instructing not to drive the disinfectant lamp, the switching element Q1 is cut off and the drive voltage is not supplied to the built-in light emitting element 33a of the photocoupler 33, whereby the photocoupler is not supplied. The built-in light receiving element 33b of 33 shuts off, and the disinfectant lamp drive command signal input unit of the disinfectant lamp ON / OFF circuit 31 is connected to the DC15V line via a pull-up resistor, so that a High signal is transmitted to the input unit. It is input as a signal indicating that the disinfection lamp is not driven.

Further, the disinfectant lamp drive circuit 22 of the present embodiment further includes a disconnection detection circuit 34 that outputs a disconnection detection signal according to the energized state of the UV lamp 18. The disconnection detection circuit 34 may be mainly composed of, for example, a current transformer (CT) that detects a current supplied from the inverter 30 to the UV lamp 18, and is High when the UV lamp 18 is energized. It is output as a disconnection detection signal indicating that the signal is energized, and when the UV lamp 18 is disconnected and is not energized, it is output as a disconnection detection signal indicating that the Low signal is disconnected. ing.

The disconnection detection signal is configured to be transmitted from the disconnection detection circuit 34 to a predetermined input port of the microcomputer 20 via the detection signal transmission means. The detection signal transmission means can have the same configuration as the command signal transmission means. In the present embodiment, the disconnection detection signal is detected while electrically insulating the microcomputer 20 and the disinfectant lamp drive circuit 22. A photocoupler 35 mounted on the UV controller board B2 is provided as an insulating portion for transmission from the circuit 34 side to the microcomputer 20 side. A disconnection detection signal is supplied to the positive electrode side terminal of the built-in light emitting element 35a of the photocoupler 35, and the negative electrode side terminal is connected to the secondary side ground S-GND. Further, the UV controller substrate B2 is provided with a connection terminal g connected to the positive electrode side of the built-in light receiving element 35b of the photocoupler 35 and a connection terminal h connected to the negative electrode side of the built-in light receiving element 35b.

On the other hand, the detection signal input port of the microcomputer 20 of the control board B1 is connected to the ground C-GND of the control board B1 via the switching element Q2. Further, the control board B1 is provided with a connection terminal e connected to the control signal input terminal (base in the illustrated example) of the switching element Q2 and a connection terminal f connected to the ground C-GND, and the control board B1 is provided. The terminal e and the terminal g of the UV controller board B2, and the terminal f of the control board B1 and the terminal h of the UV controller board B2 are connected by wiring. The detection signal input port of the microcomputer 20 is connected to the control power supply line VC15 via a pull-up resistor, and the control signal input terminal of the switching element Q2 is connected to the control power supply line VC5 via a pull-up resistor.

Therefore, when the driving power is applied to the UV lamp 18 and the UV lamp 18 is lit, a current flows through the light emitting element 35a of the photocoupler 35 to emit light, whereby the light receiving element 35b becomes conductive. Then, the control signal input terminal of the switching element Q2 is conducted to the ground C-GND, the switching element Q2 is turned off, the detection signal input port of the microcomputer 20 is pulled up, and the High signal is energized to the input port. Is input as a disconnection detection signal indicating.

Further, when the UV lamp 18 is disconnected, no current flows through the light emitting element 35a of the photocoupler 35 and the light receiving element 35b becomes non-conducting, so that the control signal input terminal of the switching element Q2 is pulled up and turned on. Then, since the detection signal input port of the microcomputer 20 is conducted to the ground C-GND, it is input to the input port as a disconnection detection signal indicating that the Low signal is disconnected.

The disconnection determination of the UV lamp 18 in the microcomputer 20 is performed when the Low signal is input as the disconnection detection signal even though the disinfectant lamp drive command signal for driving the UV lamp 18 to be lit is output. It can be configured to determine that the UV lamp 18 is broken, and if such a disconnection determination is made, notify the disconnection of the UV lamp.

According to the hot water supply device according to the present embodiment, the drive power for driving the UV lamp 18 is generated from the second power supply unit P2 for the UV lamp 18 and the DC power output by the second power supply unit P2. The fungus lamp drive circuit 22 is provided on the UV controller board B2, and the secondary side of the second power supply unit P2 and the ground S-GND of the disinfectant light drive circuit 22 are the second ground S-GND of the control board B1. Insulated from the ground P-GND on the primary side of the power supply unit P2, the signal transmission means of the sterilization light drive command signal from the microcomputer 20 on the control board B1 to the sterilization light drive circuit 22, and the sterilization light drive circuit. Since all of the signal transmission means of the disconnection detection signal transmitted from the 22 to the microcomputer 20 are configured to be able to transmit the signal while being electrically insulated by the photocouplers 33 and 35, the noise generated by the switching operation in the inverter 30 is generated by the control board. It is possible to suppress transmission to B1 and avoid the effects of abnormal operation of the microcomputer 20 due to noise and unstable hot water supply operation due to noise on the input / output signals of the microcomputer 20. it can.

Further, when the sterilization function is not required, it is not necessary to provide the UV controller board B2, which makes it possible to reduce the size of the device or replace it with a circuit board for other additional functions. Even in such a case, the terminals a, b, e, and f of the control board B1 can be diverted.

The present invention is not limited to the above embodiment, and the design can be changed as appropriate. For example, if insulation is performed on a substrate, the microcomputer 20 and the disinfectant lamp drive circuit 22 may be mounted on the same substrate. Further, the configuration of the insulating portion of the command signal transmission means and the detection signal transmission means may be various. For example, the control board B1 and the UV controller board B2 are connected by an optical fiber cable, and a light emitting diode is connected to one of the boards. Can also be configured to provide a phototransistor on the other substrate. Further, the disinfectant lamp ON / OFF circuit may be configured to switch whether or not to supply 100 V DC power to the inverter 30.

1 Hot water supply device 3 Hot water supply channel (reheating hot water supply channel)
18 UV lamp (sterilization lamp)
20 Microcomputer (control unit)
22 Bactericidal lamp drive circuit 30 Inverter 31 Bactericidal lamp ON / OFF circuit 33 Photocoupler as an insulating part of the command signal transmission means 35 Photocoupler as an insulating part of the detection signal transmission means B1 Control board VC15 For control on the control board Power line B2 UV controller board (sterilization light drive board)
P1 1st power supply unit P2 2nd power supply unit

Claims (4)

The hot water supply passage, the disinfectant lamp provided in the middle of the hot water supply passage, and the disinfectant lamp by generating drive power for driving the disinfectant lamp when a disinfectant lamp drive command signal is supplied. A sterilization light drive circuit that outputs to, a control unit that outputs the sterilization light drive command signal, and a command signal transmission means that transmits the sterilization light drive command signal from the control unit to the sterilization light drive circuit. The command signal transmission means transmits the sterilization light drive command signal from the control unit side to the sterilization light drive circuit side while electrically insulating the control unit and the sterilization light drive circuit. the insulation site to possess,
The control unit is mounted on a control board, the sterilization light drive circuit is mounted on a sterilization light drive board different from the control board, the control board has a control power supply line, and the insulation The portion is composed of a photocoupler mounted on the disinfectant lamp drive substrate, and the drive voltage of the built-in light emitting element of the photocoupler is configured to be supplied from the control power supply line. Hot water supply device with fungus function. The hot water supply device with a sterilization function according to claim 1, further includes a first power supply unit for the control unit and a second power supply unit for the sterilization lamp, and the second power supply unit is commercially available. An isolated converter that generates DC power from AC power is provided, and the disinfectant lamp drive circuit includes an inverter that generates the drive power from the DC power generated by the isolated converter and a disinfectant lamp ON / OFF circuit. The power supply voltage for the switching element constituting the inverter is configured to be supplied from the isolated converter via the sterilization lamp ON / OFF circuit, and the sterilization lamp drive command signal is the sterilization lamp ON. A hot water supply device with a sterilization function, which is characterized in that the / OFF circuit is electrically operated. In the hot water supply device with a sterilization function according to claim 2 , the first power supply unit is mounted on a substrate different from both the control unit and the sterilization lamp drive circuit, and the second power supply unit is the sterilization lamp. A hot water supply device with a sterilization function, which is characterized by being mounted on the same board as the drive circuit. In the hot water supply device with a sterilization function according to any one of claims 1 to 3, the sterilization lamp drive circuit further includes a disconnection detection circuit that outputs a disconnection detection signal according to the energized state of the sterilization lamp. The disconnection detection signal is configured to be transmitted from the disconnection detection circuit to the control unit via the detection signal transmission means, and the detection signal transmission means electrically connects the control unit and the disinfectant lamp drive circuit. A hot water supply device with a sterilization function, which has an insulating portion for transmitting the disconnection detection signal from the disconnection detection circuit side to the control unit side while being insulated from the wire.

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