TW201908746A - UV LED disconnection detection circuit and method, water collection distributor and pure water manufacturing device - Google Patents

Abstract

A disconnection detection circuit that detects disconnection of an ultraviolet LED comprises a constant-current power source which is connected to the anode and cathode of an ultraviolet LED and supplies DC power to the ultraviolet LED, and a relay having an input section connected in parallel between the anode and the cathode. A rise in the voltage between the anode and cathode as a result of disconnection of the ultraviolet LED activates the relay, thus detecting the disconnection.

Description

Disconnection detection circuit and method of ultraviolet LED, water collecting distributor and pure water manufacturing device

The invention relates to a disconnection detection circuit and method for detecting disconnection of an ultraviolet light emitting diode (LED: Light Emitting Diode), and a water collection distributor and a pure water manufacturing device having the disconnection detection circuit.

In fields such as biotechnology, the experimental results or analysis results are affected when the number of bacteria in pure water is large, so the number of bacteria in pure water needs to be reduced. Therefore, conventionally, water has been sterilized by irradiating water with ultraviolet rays. As an ultraviolet light source required for sterilization, a mercury lamp has been commonly used since ancient times. However, in recent years, a short-wavelength and high-output ultraviolet LED can be obtained, so an ultraviolet LED is used instead of the mercury lamp. For example, Patent Document 1 discloses that an ultraviolet sterilization device is incorporated in a pure water production device that processes treated water to produce pure water. The ultraviolet sterilization device irradiates the treated water with ultraviolet rays generated by ultraviolet LEDs for sterilization. Further, as a device for sterilizing water used in a laboratory or the like, Patent Document 2 discloses a device in which an ultraviolet light source composed of an ultraviolet LED is provided at an end of a tube, and water is introduced to the tube. In order to perform sterilization, Patent Document 3 discloses a configuration in which a UV light source composed of an ultraviolet LED is provided on a lid portion of a container to sterilize treated water in the container. Ultraviolet LEDs are smaller than mercury lamps, and undergo repeated light emission and extinction with less degradation. Therefore, they are also expected to be used in areas where mercury lamps are difficult to apply. [Advanced Patent Literature] [Patent Literature]

Patent Document 1: Japanese Patent Application Publication No. 2016-123930 Patent Document 2: Japanese Patent Application Publication No. 2016-523594 Patent Document 3: Japanese Patent Application Publication No. 2016-525906

[Questions to be solved by the invention]

Ultraviolet LEDs are electronic components with a risk of disconnection. For example, when using an ultraviolet LED as an ultraviolet light source for sterilizing pure water, if the ultraviolet LED is disconnected, the pure water that has not been sterilized is supplied, and the results of experiments using the pure water are significant. Impact. The same applies to the use of ultraviolet LEDs in applications other than sterilization, and the disconnection of ultraviolet LEDs has a significant effect. Therefore, in the case of using UV LEDs, we must review the circuit set to detect the disconnection of UV LEDs. However, disconnection detectors currently on the market are expensive, and there is a need to reduce the cost of the components required to detect disconnections.

An object of the present invention is to provide a disconnection detection circuit and method capable of detecting disconnection of an ultraviolet LED with a simple structure and low cost, and a water collection distributor having the disconnection detection circuit. [Means for solving problems]

The disconnection detection circuit of the present invention is used to detect the disconnection of ultraviolet LEDs. It has a constant current power supply that is connected to the anode and cathode of ultraviolet LEDs and supplies DC power to the ultraviolet LEDs; and a relay that has a parallel connection on the The input part between the anode and the cathode; the relay operates by detecting the increase in voltage between the anode and the cathode when the ultraviolet LED is disconnected, and the disconnection is detected.

The method of the present invention is used to detect the disconnection of ultraviolet LEDs. It connects a constant current power source to the anodes and cathodes of ultraviolet LEDs, and drives the ultraviolet LEDs at a constant current. The rise in the inter-voltage causes the relay having an input portion connected in parallel between the anode and the cathode to operate, and detects a disconnection.

The water production distributor of the present invention is a water production distributor used for pure water production, which includes: a solenoid valve connected to a pure water source; a nozzle for discharging pure water; a flow path connected to the outlet and the nozzle of the solenoid valve; Ultraviolet LED is configured to irradiate pure water flowing in the flow path with ultraviolet light; constant current power is connected to the anode and cathode of the ultraviolet LED and supplies DC power to the ultraviolet LED; a relay has a parallel connection between the anode and The input section between the cathodes and the control section control the opening and closing of the solenoid valve, and when the solenoid valve is opened, the constant current power supply is operated, the relay operation is detected, and the disconnection of the ultraviolet LED is detected, and the detected Generate an alarm when disconnected.

The pure water manufacturing device of the present invention has at least a water storage tank for storing pure water, which includes: an ultraviolet LED, which is installed in the water storage tank and is configured to irradiate the pure water in the water storage tank with ultraviolet light; The anode and cathode of the LED are connected and supply DC power to the ultraviolet LED; the relay has an input section connected in parallel between the anode and the cathode; and the control section controls the opening and closing of the solenoid valve, and when the solenoid valve is opened The constant current power supply is operated, the relay is detected, the disconnection of the UV LED is detected, and an alarm is generated when the disconnection has been detected. [Effect of Invention]

According to the present invention, the disconnection of the ultraviolet LED can be detected with a simple structure and low cost.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the structure of a disconnection detection circuit according to an embodiment. When driving an ultraviolet LED, it is generally necessary to make the value of the forward current not exceed the rated value. Therefore, a mechanism for limiting the current flowing to the ultraviolet LED is required. The disconnection detection circuit of this embodiment detects a disconnection of the ultraviolet LED 11 and includes a constant current power source 12 and a relay 13. The constant current power source 12 supplies direct current power to the ultraviolet LED 11 while limiting the current, and determines the ultraviolet LED 11. Current driven. The positive output (+) of the constant current power supply 12 is connected to the anode A of the ultraviolet LED 11, and the negative output (-) is connected to the cathode K. The input portion 14 of the relay 13 is connected in parallel between the anode A and the cathode K of the ultraviolet LED 11. In the figure, the relay 13 is a mechanical relay, and the input unit 14 is constituted by an operating coil of the relay 13, that is, an electric solenoid. The output 15 of the relay 13 has three contacts 16 to 18. The contact 16 is a common contact COM, and the contact 17 is a normally-closed contact NC, which is a contact that is electrically connected to the contact 16 only when there is no predetermined input in the input section 14, that is, when the action coil is not operated. The contact 18 is a normally open contact NO, and is a contact that is electrically connected to the contact 16 when the input coil 14 has a predetermined input, that is, when the action coil operates. Here, the relay 13 is a mechanical relay, but the relay 13 may be, for example, a solid state relay or a semiconductor relay.

When the ultraviolet LED 11 is driven with a constant current, the voltage between the anode A and the cathode K, that is, the forward voltage is determined according to the forward current and voltage characteristics of the ultraviolet LED 11, but it is about 2 to 4V. On the other hand, the constant current power supply 12 is supplied with a slightly higher voltage in order to stably output a predetermined current. Therefore, the open-state voltage of the constant-current power supply 12, that is, the output voltage when no load is, for example, about 10-20V. Here, the operating voltage of the relay 13 is considered to be higher than the forward voltage of the ultraviolet LED 11 and lower than the open-state voltage of the constant current power supply 12. If the UV LED 11 operates normally, the voltage applied to the input portion 14 of the relay 13 is the forward voltage of the UV LED 11, so the relay 13 will not operate. On the other hand, if the UV LED 11 becomes disconnected, it will act on the input. The voltage of the unit 14 becomes the open-state voltage of the constant-current power supply 12, so the relay 13 operates. In this disconnection detection circuit, for example, the power supply voltage VDD is applied to the contact 18 of the relay 13 which is the normally open contact NO, and the ground potential GND is applied to the contact 17 which is the normally closed contact NC, and it is determined that the common connection is The potential of the contact 16 at the point COM is the power supply voltage VDD or the ground potential GND, whereby the disconnection of the ultraviolet LED 11 can be detected.

When the ultraviolet LED 11 is disconnected and the potential of the contact 16 of the relay 13 becomes, for example, the power supply voltage VDD, an alarm signal may be generated based on a signal from the contact 16. Further, the equipment related to the ultraviolet LED 11 where the disconnection may occur may be stopped as necessary.

Next, a device in which an ultraviolet LED is provided and a disconnection detection circuit according to the present invention is applied will be described. Here, as a device provided with an ultraviolet LED, a water collection distributor is illustrated as an example. This water collection distributor is connected to a pure water production device and the like, and discharges pure water as needed. Of course, the machine system to which the disconnection detection circuit according to the present invention is applied is not limited to a water collection distributor.

When pure water is used in research institutes and the like, relatively small pure water production equipment is often used to produce pure water. Furthermore, at the point of use, in order to collect pure water into, for example, beakers, bottles, test tubes, etc., a water collection dispenser connected to a pure water production apparatus is widely used. The water production distributor includes: a nozzle for discharging pure water; and an on-off valve, which is provided on the path of the pure water to the nozzle, supplies pure water to the nozzle, and cuts off the supply. The water collection distributor is generally installed at a point of use that is far from the system of the pure water production device, and is connected to the pure water outlet of the body of the pure water production device by a pipe. The user operates the on-off valve to discharge pure water from the nozzle, whereby the user can collect pure water in an amount corresponding to a required amount. As the on-off valve, for example, a solenoid valve can be used. When using a solenoid valve, control the solenoid valve with a button switch that can be operated by a finger or a foot switch that can be operated by a foot, so that pure water is discharged from the nozzle. Furthermore, by combining a flow sensor and a solenoid valve, the solenoid valve can be opened until the flow rate measured by the flow sensor reaches a predetermined value during one switching operation. Pure water is collected.

Fig. 2 shows a pure water production device and a water production distributor. The pure water production device is basically composed of a primary pure water production device 30 and a subsidiary system 50. The primary pure water production device 30 is supplied with tap water and the like to generate primary pure water, and the subsidiary system 50, that is, a secondary pure water system. The primary pure water produced by the primary pure water production apparatus 30 is supplied through the piping 45 to produce pure water with higher purity. The sub-system 50 includes a circulation purification system. In the primary pure water production apparatus 30, a supply water system such as tap water is introduced into an activated carbon cylinder (CC) 32 via a valve 31. The outlet water of the activated carbon cylinder 32 is sent to a reverse osmosis device (RO) 35 provided with a reverse osmosis membrane via a pressure switch (PS) 33 and a pump 34. A pipe 43 having an orifice 36 is connected to the concentration side of the reverse osmosis device 35, and the drainage system from the concentration side is discharged through this pipe 43. The orifice 36 is provided to maintain a constant pressure on the concentration side of the reverse osmosis device 35. The water system that has passed through the reverse osmosis membrane of the reverse osmosis device 35 is then sequentially diverted to non-renewable ion exchange devices (CP: also known as Cartridge Polisher) 39 and 41 arranged in two stages. The non-regenerating ion exchange devices 39 and 41 are both filled with a strongly acidic cation exchange resin and a strongly basic anion exchange resin in a mixed bed. A piping between the reverse osmosis device 35 and the non-regenerating ion exchange device 39 in the first stage is connected to a conductivity meter (CI) 37 that measures the conductivity and temperature of water sent to the non-regeneration ion exchange device 39, respectively. And thermometer (TI) 38. A conductivity meter 40 is also provided in the piping between the non-regenerating ion exchange devices 39 and 41 in the first and second steps. A check valve 42 is provided at the outlet of the non-regenerative ion exchange device 41. An outlet of the check valve 42 is an outlet of the primary pure water production apparatus 30 and is connected to a pipe 45.

The sub-system 50 includes a water storage tank 51 that is supplied with primary pure water from a pipe 45 through a valve 52. The water storage tank 51 is provided with an ultraviolet irradiation device 53 for irradiating pure water in the water storage tank 51 for sterilization; a water level sensor (LS) 54 for detecting pure water in the water storage tank 51 Water level; and aeration filter 55. The water storage tank 51 communicates with the atmosphere through the ventilation filter 55, and maintains the pressure in the water storage tank 51 at atmospheric pressure. As the ultraviolet irradiation device 53, for example, a person using an ultraviolet LED, a person using an ultraviolet lamp, or the like can be used.

At the outlet of the water storage tank 51, a pump 56 for supplying pure water in the water storage tank 51 is provided. At the outlet of the pump 56, an ultraviolet oxidation device (UV) 57 is sequentially installed, and two stages of non-regenerating ion exchange devices are arranged in series. 58, 59 and Ultrafiltration Unit (UF) 60. A pipe 101 branched from an outlet pipe of the pump 56 is provided, and an outlet port 71 is provided at a front end of the pipe 101. The ultrafiltration device 60 is provided with a pipe 106 for discharging water on the primary side of the ultrafiltration membrane, and a valve 107 is provided in the pipe 106. At the outlet of the ultrafiltration device 60, a pipe 102 connected to the outlet port 72 is connected, and a resistivity meter (RI) 63 and a thermometer 64 that measure the resistivity and temperature of the flowing pure water are connected to the pipe 102, respectively. At the outlet of the ultrafiltration device 60, a pipe 103 for returning pure water to the water storage tank 51 side is also provided, and a constant flow valve 61 is installed at the front end of the pipe 103. A piping 103 is connected to a TOC meter (TOCI) 62 that measures the total organic carbon (TOC) concentration of the flowing pure water. An outlet of the constant flow valve 61 is connected to a pipe 104 returning to the water storage tank 51 and a pipe 105 connected to the outlet port 73. A back pressure valve 65 is provided in the pipe 105. A sampling valve 66 used for sampling pure water is attached to the piping 104.

In the sub-system 50, a circulation purification system that returns from the water storage tank 51 to the water storage tank 51 via the pump 56, the ultraviolet oxidation device 57, the non-renewable ion exchange devices 58, 59, the ultrafiltration device 60, and the constant flow valve 61 is formed. Pure water is purified between the circulation purification systems, thereby obtaining pure water that can be supplied to the point of use. The ultraviolet oxidizing device 57 is used to decompose total organic carbon in pure water and also has a bactericidal effect. However, the cycle purification system may stop operating at night or on holidays. In order to suppress the bacterial growth in the water storage tank 51 during this stop period, It is also preferable to provide an ultraviolet irradiation device 53 in the water storage tank 51 in addition to the reproduction with the ultraviolet oxidation device 57. Since it is necessary to be able to be hydrolyzed, a low-pressure mercury lamp is generally used as an ultraviolet source in the ultraviolet oxidation device 57. In the sub-system 50, a valve 68 is connected to the piping 45 in order to directly discharge the primary pure water from the piping 45 as drainage. A valve 69 for draining water from the water storage tank 51 is also provided at the outlet of the water storage tank 51. A check valve 67 is provided between the drain side of the valve 69 and the inlet side of the water storage tank 51. Furthermore, in order to control the overall operation of the pure water production apparatus, a main control device 70 is provided. A sensor may be connected to the main control device 70 to detect a water leak in the pure water production device.

The outlet ports 71 to 73 provided in the sub-system 50 are ports that serve as a connection position of the water collection distributor 80. The water production distributor 80 is connected to any one of the outlet ports 71 to 73 through, for example, a flexible pipe 75. Here, three outlet ports 71 to 73 are provided, but the connection points to the outlet ports of the circulation purification system are not limited to those shown in FIG. 2. However, from the viewpoint of water quality and pressure, it is better to connect the water production distributor 80 to the outlet port 72. The number of outlet ports with the circulation purification system is not limited to three, but can be increased or decreased. For example, a plurality of outlet ports connected to the outlet of the ultrafiltration device 60 may be provided, and a water collection distributor 80 may be connected to each of these outlet ports.

Next, the water collection dispenser 80 will be described. The circulation purification system of the sub-system 50 is provided with an ultraviolet irradiation device 53 or an ultraviolet oxidation device 57 to sterilize the pure water circulating in the circulation purification system. However, for example, pipes 75, 101, and 102 are branched from the circulation purification system. The piping of 105 and the pure water system inside the water collection distributor 80 do not circulate, so the possibility of bacterial growth at these locations remains. Therefore, the water-collecting dispenser 80 described here uses an ultraviolet sterilizing mechanism equipped with an ultraviolet LED, and can always supply pure water that reduces the number of contained bacteria.

The water collection dispenser 80 is roughly composed of a head portion 80a and a main body portion 80b, and the head portion 80a and the main body portion 80b are connected by a flexible pipe 84. As a use form of the water collection dispenser 80, for example, there is a user who continuously injects pure water into a plurality of test tubes arranged in a row on an experimental table. Therefore, the control mechanism and the like required to function as the water collection dispenser 80 are provided on the main body portion 80b, and the portion that actually becomes the injection port of pure water is provided on the head 80a, which is held by the user Hold and move to the desired position.

The head portion 80a discharges pure water supplied from the main body portion 80b through the pipe 84, and includes a flow path 85 connected to the pipe 84, and a nozzle 86 provided at the end of the flow path 85 and discharging pure water; and ultraviolet rays. The irradiating section 87 irradiates the pure water flowing through the flow path 85 with ultraviolet rays. The ultraviolet irradiation unit 87 functions as an ultraviolet sterilization mechanism, and an ultraviolet LED is used as an ultraviolet source in the ultraviolet irradiation unit 87. Further, the head 80a is provided with a switch 88 operated by the user in order to discharge pure water in response to the needs of the user.

The main body portion 80b is provided with a piping 81, one end of which is connected to a piping 75 from the sub-system 50, a flow sensor (FI) 82, which is provided on the piping 81, and a solenoid valve 83, which is installed on the other of the piping 81. One end; the control section 90 controls the operation of the water-collection distributor 80; and an operation panel 89 connected to the control section 90. The solenoid valve 83 is opened based on a drive signal from the control unit 90. The operation panel 89 receives, for example, a setting of a water collection amount or a water collection mode from a user, and displays necessary information to the user. The water collection mode is, for example, a quantitative mode or an arbitrary quantity mode. The control unit 90 performs overall control of the water collection distributor 80. For example, it receives a water collection request from a user inputted through the switch 88 of the head 80a, and when the water collection mode is a quantitative mode, it is created by The solenoid valve 83 is opened until the accumulated value of the flow rate detected by the flow rate sensor 82 becomes a set value, and the head 80 a is supplied with pure water in an amount indicated by the set value. On the other hand, when the water collection mode is an arbitrary amount mode, the control unit 90 performs control to open the solenoid valve 83 only while the switch 88 is being operated. The control unit 90 is controlled to drive the ultraviolet LED in the ultraviolet irradiation unit 87 only when the solenoid valve 83 is opened regardless of the water collection mode. Further, the control unit 90 may be connected to the main control device 70 of the pure water production device through wiring (not shown), and display information such as water quality and the like obtained from the main control device 70 on the operation panel 89.

FIG. 3 shows the external appearance and the internal structure of the head part 80a of the water collection dispenser 80. As shown in FIG. The head 80a is provided with a handle 118 or a handle, and a button 119 is provided at a position where a user who holds the handle 118 can easily operate with his or her fingers. The button 119 is mechanically connected to the switch 88 (not shown in FIG. 3), and the switch 88 is operated by pressing the button 119. The flow path 85 is provided with a joint 111 to be connected to the piping 84, a housing 112 connected to the joint 111 and having a through-flow path 114 inside, a coupler 115 connected at one end to the outlet of the through-flow path 114 of the housing 112, and a prevention The other end of the backflow mechanism 117 and the coupler 115 are connected to the inlet of the backflow prevention mechanism 117 via the third joint portion 116. The exit of the backflow prevention mechanism 117 is opened outside the head 80a, and the nozzle 86 is mounted there by screws, for example.

The ultraviolet irradiation section 87 is composed of a substrate 94 on which the ultraviolet LED 11 is mounted on the first surface and a heat sink 95, and the radiator 95 is mounted on the substrate 94 on the opposite side from the first surface. The second side. The heat sink 95 is used to dissipate heat generated when the ultraviolet LED 11 is driven. A curved portion is provided in the through-flow path 114 of the housing 112, and a hollow portion 113 is formed from the curved portion to one side of the housing 112. When viewed from the through-flow path 114 side, it is provided at the innermost portion of the hollow portion 113 for ultraviolet introduction. Window of quartz glass plate 96. The quartz glass plate 96 is provided so as to face the first surface of the substrate 94, and the ultraviolet rays emitted from the ultraviolet LED 11 pass through the quartz glass plate 96 and the hollow portion 113 and enter the through-flow path 114. The head 80 a is configured to irradiate pure water flowing through the flow path 85 with ultraviolet rays, and perform ultraviolet sterilization treatment on the pure water. As a material constituting the casing 112, by using a material that sufficiently reflects ultraviolet rays such as polytetrafluoroethylene (PTFE) or polyvinylidene fluoride (PVDF), pure water can be efficiently irradiated with ultraviolet rays. In particular, in this embodiment, as shown in FIG. 3, since ultraviolet rays are irradiated to the position of the bent portion penetrating the flow path 114, by using PTFE, PVDF, or the like, which constitutes the inner wall of the joint 111 or the pipe 84, As shown by the arrow marked UV in FIG. 3, ultraviolet rays can be radiated into the pipe 84, and pure water can be irradiated with ultraviolet rays more efficiently.

Mercury lamps, which have been used as ultraviolet light sources in the past, are large in size and are not suitable for frequent opening and closing operations. Therefore, the installation of a water dispenser, especially the head, makes it difficult to turn on the lamp only when pure water is needed. The water-collecting distributor 80 shown here uses ultraviolet LED11 to perform ultraviolet sterilization of pure water at a position immediately before the position where the water-collecting distributor 80 discharges pure water. The sterilization process can be performed reliably.

FIG. 4 shows a circuit configuration of the water production distributor 80. The water dispenser that discharges pure water that has been sterilized by ultraviolet LEDs may discharge pure water containing bacteria when the ultraviolet LEDs are disconnected. Therefore, the water collection distributor 80 shown in FIG. 4 is provided with a constant current power supply 12 for driving the ultraviolet LED 11 formed on the head 80a; and a relay 13 for detecting the disconnection of the ultraviolet LED 11; And constitute the same disconnection detection circuit as that shown in FIG. 1. Although not shown in FIG. 2, the constant-current power supply 12 and the relay 13 are provided in the main body portion 80 b. The constant current power supply 12 is turned on / off based on a signal from the control unit 90. The control unit 90 is connected to the operation panel 89 and the switch 88 of the head 80 a, and a flow rate detection value is input from the flow rate sensor 82. In accordance with these inputs, the control unit 90 controls the solenoid valve 83 and the constant current power source 12 to start the constant current power source 12 at the timing when the solenoid valve 83 is opened, and stops the constant current power source 12 at the timing when the solenoid valve 83 is closed. The ultraviolet LED 11 and the switch 88 provided on the head portion 80 a and the main body portion 80 b are electrically connected by, for example, a wiring (not shown) provided in parallel with the piping 84.

In the disconnection detection circuit, the contact 17 of the relay 13 which is the normally closed contact NC is connected to the ground potential, and the power supply voltage is applied to the contact 18 which is the normally open contact NO. The contact 16 which is a common contact COM is connected to the control unit 90. When the constant current power supply 12 is stopped, because the input of the relay 13 does not exist, the potential of the contact 16 is the ground potential (that is, the L level). When the constant-current power supply 12 is operating and the ultraviolet LED 11 is also operating normally, as described above, the relay 13 does not operate, so the potential of the contact 16 is the ground potential. In contrast, when the constant-current power supply 12 operates, but the ultraviolet LED 11 is disconnected, the relay 13 operates, and the potential of the contact 16 is the power supply voltage or a value close to the power supply voltage, which becomes the H level. Therefore, the control unit 90 detects the failure, and detects the disconnection of the ultraviolet LED 11 by detecting that the voltage of the signal transmitted from the contact 16 of the relay 13 becomes the H level.

The control unit 90 detects a disconnection of the ultraviolet LED 11. For example, the control unit 90 can display an alarm for the purpose of the disconnection on the operation panel 89. Alternatively, after the alarm is displayed, in order to prevent the water collection by the water collection distributor 80 from being performed, the control of stopping the water supply by the solenoid valve 83 without sending a drive signal may be performed. In the case where a plurality of water collection distributors 80 are connected to the sub-system 50, even if the water collection distributor that has broken the ultraviolet LED 11 stops supplying water, the influence is small.

As described above, the case of detecting the disconnection of the ultraviolet LED 11 provided in the water collection distributor 80 has been described. However, the disconnection detection circuit according to the present invention irradiates pure water in the water storage tank 51 with ultraviolet rays for sterilization. It is also possible to detect the disconnection of the ultraviolet LED used in the ultraviolet irradiation device 53. When a disconnection of the ultraviolet LED used in the ultraviolet irradiation device 53 is detected, the output of the disconnection detection circuit is supplied to the main control device 70, for example. The main control device 70 detects the disconnection of the ultraviolet LED in the ultraviolet irradiation device 53, and can display an alarm for the purpose of disconnection on a display device (not shown) or the operation panel 89 of the water dispenser 80.

The above-mentioned pure water production device includes a sub-system 50 having a water storage tank 51, a pump 56, a UV oxidizing device 57, a non-regenerative ion exchange device 58, 59, an ultrafiltration device 60, and a constant flow valve 61. However, in order to sterilize the pure water stored in the water storage tank, the ultraviolet LED 11 is used, and the disconnection of the ultraviolet LED is detected by the disconnection detection circuit according to the present invention. This is not only applicable to a pure water manufacturing apparatus having a sub system. For a pure water manufacturing device that does not have a sub-system but has a water storage tank for storing pure water, an ultraviolet irradiation device with an ultraviolet LED may be provided for sterilizing the pure water in the water storage tank, and a disconnection detection circuit according to the present invention may be provided. .

11‧‧‧ UV LED

12‧‧‧Constant current power supply

13‧‧‧ Relay

14‧‧‧Input Department

15‧‧‧Output Department

16‧‧‧ contact

17‧‧‧Contact

18‧‧‧ contact

50‧‧‧ subsystem

51‧‧‧ water tank

53‧‧‧Ultraviolet irradiation device

70‧‧‧Main control device

90‧‧‧Control Department

A‧‧‧Anode

K‧‧‧ cathode

NC‧‧‧Normally closed contact

NO‧‧‧Normally open contact

COM‧‧‧Common Contact

＋ ‧‧‧ Positive side output

－‧‧‧ Negative side output

[Fig. 1] A circuit diagram showing a configuration of a disconnection detection circuit according to an embodiment. [Fig. 2] A flowchart showing an example of the configuration of a pure water production device and a water collection distributor. [Fig. 3] is a front view showing the internal structure of the water distributor. [Figure 4] is a circuit diagram showing the disconnection detection circuit installed in the water distributor.

Claims (7)

A disconnection detection circuit for detecting a disconnection of an ultraviolet LED includes: a constant current power supply connected to an anode and a cathode of the ultraviolet LED and supplying a direct current power to the ultraviolet LED; and a relay having a parallel connection to the anode An input between the cathode and the cathode; the relay is activated by the voltage rise between the anode and the cathode when the ultraviolet LED is disconnected, and the disconnection is detected. For example, the disconnection detection circuit of the first patent application range, wherein the relay is a mechanical relay, and the input section is an action coil of the relay. For example, the disconnection detection circuit of item 1 or 2 of the patent application scope has a control unit that controls the solenoid valve used to switch on and off the supply of pure water, and generates it when the disconnection is detected. Control of alarms. A disconnection detection method for detecting disconnection of an ultraviolet LED includes: connecting a constant current power source to an anode and a cathode of the ultraviolet LED, and driving the ultraviolet LED at a constant current; when the ultraviolet LED is disconnected, The increase in the voltage between the anode and the cathode activates a relay having an input portion connected in parallel between the anode and the cathode, and detects the disconnection. A water collection distributor for pure water, including: a solenoid valve connected to a pure water source: a nozzle that discharges pure water; a flow path that connects the outlet of the solenoid valve to the nozzle; an ultraviolet LED that is configured to Pure water flowing through the flow path is irradiated with ultraviolet light; a constant-current power supply is connected to the anode and cathode of the ultraviolet LED and supplies DC power to the ultraviolet LED; a relay having an input connected in parallel between the anode and the cathode And a control unit for controlling the opening and closing of the solenoid valve, and activating the constant current power supply when the solenoid valve is opened, detecting that the relay is activated, and detecting the disconnection of the ultraviolet LED, and detecting An alarm is generated when this disconnection occurs. For example, the water dispenser of item 5 of the patent application scope, wherein the control section performs control to maintain the solenoid valve in a closed state when the disconnection has been detected. A pure water manufacturing device includes at least a water storage tank for storing pure water, including: an ultraviolet LED installed in the water storage tank and configured to irradiate ultraviolet light to the pure water in the water storage tank; a constant-current power supply connected to the ultraviolet LED The anode and the cathode are connected and supply DC power to the ultraviolet LED; the relay has an input portion connected in parallel between the anode and the cathode; and the control portion controls the opening and closing of the solenoid valve, and when the solenoid valve is opened The constant current power supply is operated, the relay operation is detected, the disconnection of the ultraviolet LED is detected, and an alarm is generated when the disconnection has been detected.