JP2009204295A - Heater control module for water heater, and heater device for water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heater control device for a water heater capable of coping with various power source specifications with a simple constitution, improving workability and reducing costs. <P>SOLUTION: This heater control device comprises a three phase input terminals 1, with which a three phase AC power source can be connected, heater connecting terminals 2, 3, with which three heaters R1, R2, R3 for the three phase AC power source are connected, and a change over unit for switching the heaters R1, R2, R3 into the Y-connection or delta connection with the three phase AC power source connected with the three phase input terminals 1, when the three phase AC power source is connected with the three phase input terminals 1 so that the heaters R1, R2, R3 having substantially identical resistances are driven by the three phase AC voltage. When a single phase AC power source is connected with the two terminals of the three phase input terminals so that the two heater units for the single phase AC power source are driven with a single phase AC voltage, the change over unit switches between connection of the two heater units for the single phase AC power source in series with or connection of one of the two heater units with the single phase AC power source which is connected with the three phase input terminals 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a heater control module for a water heater and a heater device for a water heater.

  2. Description of the Related Art Conventionally, as a hot water storage type heater / water heater, there is one provided with a heater unit for heating water in a hot water storage tank (see, for example, Japanese Patent Application Laid-Open No. 2006-329581 (Patent Document 1)). In such a hot water storage type heating water heater, in order to perform capacity control from the viewpoint of energy saving, a control device that controls the heater is provided.

By the way, in Europe, it is necessary to prepare a plurality of types of heaters in order to cope with various power supply specifications such as single-phase / three-phase or 230V / 400V depending on local power supply conditions. For this reason, it is necessary to change the control circuit for single-phase AC power supplies and three-phase AC power supplies, and it is necessary to prepare multiple types of control devices that control the heater, which can result in poor workability and high cost. There is a problem of doing.
JP 2006-329581 A

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heater control module for a water heater that can cope with different power supply specifications with a simple configuration, has good workability, and can reduce costs, and a heater device for a water heater using the heater control module for the water heater. It is to provide.

In order to solve the above problems, a heater control module for a hot water heater of the present invention is:
A heater control module for a water heater used in a water heater provided with three heater parts for three-phase AC power source for heating water or two heater parts for single-phase AC power source,
A three-phase input terminal having first, second and third terminals to which a three-phase AC power supply can be connected;
A first heater connection terminal having first, second, and third terminals to which the first, second, and third terminals of the three-phase input terminal are respectively connected;
A second heater connection terminal having first, second and third terminals to which the first, second and third terminals of the three-phase input terminal respectively correspond;
A first switch for connecting or disconnecting the first, second and third terminals of the second heater connection terminal corresponding to the first, second and third terminals of the three-phase input terminal;
A second switch for connecting the first, second and third terminals of the second heater connecting terminal to each other to short-circuit or disconnect;
A control unit for controlling the first switch and the second switch;
With
The control unit
Three heater portions for the three-phase AC power supply are connected externally between the first heater connection terminal and the second heater connection terminal, and the three-phase AC power supply is connected to the three-phase input terminal, When driving the three heater parts for the three-phase AC power source having substantially the same resistance value with a three-phase AC voltage, the three-phase input terminal is controlled by controlling the first switch and the second switch. For the connected three-phase AC power supply, the three heater parts for the three-phase AC power supply are switched to Y connection or Δ connection,
Two heaters of the single-phase AC power source between the first heater connecting terminal and the second heater connecting terminal is connected with an external single-phase AC power supply to the two terminals of the three phase input terminal When the two heater units for the single-phase AC power supply are driven with a single-phase AC voltage, the first switch and the second switch are controlled to connect to the three-phase input terminal. against the single-phase AC power source, Ru switched either to connect one of the two heater for or the single-phase AC power source two heater portions for series connection of the single-phase AC power supply and wherein a call.

  Here, a single heater may be used as the heater unit as one heater unit, or a single heater unit may be configured by combining a plurality of heaters.

According to the above configuration, when the three-phase AC power source is connected to the three-phase input terminal and the three heater units for the three-phase AC power source having substantially the same resistance value are driven by the three-phase AC voltage, the control unit By controlling the first switch and the second switch , the three heaters for three-phase AC power supply are Y-connected or Δ-connected to the three-phase AC power supply connected to the three-phase input terminal Switch. In addition, when a single-phase AC power source is connected to two of the three-phase input terminals and the two heater units for the single-phase AC power source are driven with a single-phase AC voltage, the control unit is connected to the first switch. By controlling the second switch and the second switch, two heater units for a single-phase AC power supply are connected in series to the single-phase AC power source connected to the three-phase input terminal, or one of the two heater units. Switch the connection. In this way, it is possible to cope with different power supply specifications with a simple configuration without preparing a plurality of types according to the power supply specifications, the workability during installation is good, and the cost can be reduced.

In one embodiment of the heater control module for a water heater, the three-phase AC power supply is provided between the three-phase input terminal and the first heater connection terminal and between the three-phase input terminal and the first switch. Or the interruption | blocking apparatus which interrupts | blocks the alternating voltage from the said single phase alternating current power supply was provided.

According to the above-described embodiment, the three-phase AC power source or the single-phase AC power source is provided in the event of an abnormality by the interrupting device provided between the three-phase input terminal and the first heater connection terminal and between the three-phase input terminal and the first switch. By interrupting the AC voltage from the circuit, damage to circuits such as the heater unit and the switching unit (control unit, first switch, second switch) can be minimized.

In one embodiment of the heater control module for a water heater, the three-phase AC power source is detected by detecting an overheating state of the three heater units for the three-phase AC power source or the two heater units for the single-phase AC power source. And a safety device that cuts off the connection between the three heaters for the three-phase AC power supply or cuts off the connection between the single-phase AC power supply and the two heater parts for the single-phase AC power supply.

According to the embodiment, the three-phase AC power source (or the single-phase AC power source) is detected by the safety device that detects the overheating state of the three heater units for the three-phase AC power source (or the two heater units for the single-phase AC power source). By disconnecting the connection between the heater part and the heater part, it is possible to prevent deterioration and damage of the circuits such as the heater part and switching part (control part, first switch, second switch) against abnormal overheating of the heater part. Can be improved.

In one embodiment of the heater control module for a hot water heater, the safety device is disposed between the three-phase input terminal and the first heater connection terminal and between the three-phase input terminal and the first switch. Has been.

According to the above embodiment, the safety device is disposed between the three-phase input terminal and the first heater connection terminal and between the three-phase input terminal and the first switch, whereby the three-phase input terminal and the first, The safety device can be made into a common module together with the second heater connection terminal and the switching unit (control unit, first switch, second switch) , and both power specifications can be used for three-phase AC power and single-phase AC power. The cost can be reduced while improving the reliability.

In the heater device for a hot water heater of the present invention,
Any one of the above-mentioned heater control modules for a water heater;
Two heater portions for the single-phase AC power source connected between the first heater connection terminal and the second heater connection terminal of the heater control module for the water heater,
The two heater parts for the single-phase AC power supply have substantially the same resistance value.

According to the above embodiment, a single-phase AC power source is connected to two of the three-phase input terminals, and two heater units for a single-phase AC power source having substantially the same resistance value are driven with a single-phase AC voltage. When the control unit controls the first switch and the second switch, the two heater units for the single-phase AC power source are connected in series to the single-phase AC power source connected to the three-phase input terminal. Or switching between connecting one of the two heater sections. As a result, the ratio of the power when two heater units for a single-phase AC power source are connected in series to the power when one of the two heater units is connected is 1: 2, and the ratio is 1: 2. Step control of the power ratio is possible.

In the heater device for a hot water heater of the present invention,
Any one of the above-mentioned heater control modules for a water heater;
Two heater portions for the single-phase AC power source connected between the first heater connection terminal and the second heater connection terminal of the heater control module for the water heater,
One of the two heater parts for the single-phase AC power source is a heater pair in which two heaters having substantially the same resistance value and resistance value of the other heater part are connected in parallel,
The control unit controls the first switch and the second switch to connect the heater pair and the other heater unit in series with respect to the single-phase AC power source connected to the three-phase input terminal. Or only the heater pair is connected.

According to the above configuration, when the single-phase AC power supply is connected to two of the three-phase input terminals and the two heater units for the single-phase AC power supply are driven by the single-phase AC voltage, the control unit By controlling one switch and the second switch , a heater pair (the other heater) is one of the two heater units for the single-phase AC power supply with respect to the single-phase AC power supply connected to the three-phase input terminal. The two heaters having substantially the same resistance value and resistance value are connected in parallel) and the other heater unit are connected in series or the heater pair is connected. As a result, the ratio of the power when the heater pair and other heater units are connected in series to the power when the heater pair is connected is 1: 3, and step control with a power ratio of 1: 3 is possible. Become.

In the heater device for a hot water heater of the present invention,
Any one of the above-mentioned heater control modules for a water heater;
Two heater portions for the single-phase AC power source connected between the first heater connection terminal and the second heater connection terminal of the heater control module for the water heater,
One of the two heater parts for the single-phase AC power source is a heater pair in which two heaters having substantially the same resistance value and resistance value of the other heater part are connected in parallel,
The control unit controls the first switch and the second switch to connect the heater pair and the other heater unit in series with respect to the single-phase AC power source connected to the three-phase input terminal. Or only the other heater part is connected.

According to the above configuration, when the single-phase AC power source is connected to two of the three-phase input terminals and the two heater units for the single-phase AC power source are driven by the single-phase AC voltage, the control unit is By controlling the first switch and the second switch , a heater pair that is one of the two heater units for the single-phase AC power supply (the other of the two-phase AC power supply connected to the three-phase input terminal) The two heaters having substantially the same resistance value and resistance value are connected in parallel) and the other heater unit is connected in series or the other heater unit is connected. As a result, the ratio of the power when the heater pair and the other heater unit are connected in series to the power when the other heater unit is connected is 2: 3, and the step control of the power ratio of 2: 3 is performed. It becomes possible.

In the heater device for a hot water heater of the present invention,
Any one of the above-mentioned heater control modules for a water heater;
Two heater portions for the single-phase AC power source connected between the first heater connection terminal and the second heater connection terminal of the heater control module for the water heater,
One of the two heater parts for the single-phase AC power source is a heater pair in which two heaters having substantially the same resistance value and resistance value of the other heater part are connected in parallel,
The control unit controls the first switch and the second switch to connect the heater pair and the other heater unit in series with respect to the single-phase AC power source connected to the three-phase input terminal. Or only one of the heater pairs is connected.

According to the above configuration, when the single-phase AC power source is connected to two of the three-phase input terminals and the two heater units for the single-phase AC power source are driven by the single-phase AC voltage, the control unit is By controlling the first switch and the second switch , a heater pair that is one of the two heater units for the single-phase AC power supply (the other of the two-phase AC power supply connected to the three-phase input terminal) The two heaters having substantially the same resistance value and resistance value are connected in parallel) and the other heater unit are connected in series or only one of the heater pairs is connected. As a result, the ratio of the power when the heater pair and the other heater unit are connected in series to the power when only one of the heater pairs is connected is 2: 3, and the step control is performed at a power ratio of 2: 3. Is possible.

In the heater device for a hot water heater of the present invention,
Any one of the above-mentioned heater control modules for water heaters;
Including three heater portions for the three-phase AC power source connected between the first heater connection terminal and the second heater connection terminal of the heater control module for the water heater,
The resistance value of the three heater parts for the three-phase AC power source used in the low voltage region where the AC voltage of the three-phase AC power source is at least 230V and the high voltage region where the AC voltage of the three-phase AC power source is at least 400V. The ratio of the resistance values of the three heater units for the three-phase AC power supply is approximately 1: 3.

  According to the above configuration, when driving a three-phase AC power source in which a three-phase AC power source is connected to a three-phase input terminal, the three-phase AC power source 3 used in a low voltage region where the AC voltage of the three-phase AC power source is at least 230V. By setting the ratio of the resistance values of the three heater units and the resistance values of the three heater units for the three-phase AC power source used in a high voltage region where the AC voltage of the three-phase AC power source is at least 400V to about 1: 3, the heater unit The power and step control are substantially the same. Therefore, regardless of whether the AC voltage of the three-phase AC power supply is in a low voltage region such as 230V or a high voltage region such as 400V, the heating capacity for hot water supply is approximately equal by the two types of heaters having different resistance values. Can be.

As is clear from the above, according to the heater control module for hot water heater of the present invention, it is possible to realize a heater control module for hot water heater that can cope with different power supply specifications with a simple configuration, has good workability and can reduce costs. it can.

Moreover, according to the heater control module for a hot water heater of one embodiment, the three-phase at the time of abnormality is provided by the shut-off device provided between the three-phase input terminal and the heater connection terminal and between the three-phase input terminal and the first switch. By interrupting the AC voltage from the AC power source or the single-phase AC power source, damage to the heater unit and the control circuit can be minimized.

In addition, according to the heater control module for a hot water heater of an embodiment, the safety device that detects the overheating state of the three heater parts for the three-phase AC power supply (or the two heater parts for the single-phase AC power supply) By cutting off the connection between the phase AC power supply (or single-phase AC power supply) and the heater section, deterioration and damage of the circuits such as the heater section and switching section can be prevented against abnormal overheating of the heater section, improving reliability. it can.

Moreover, according to the heater control module for a hot water heater of one embodiment, by disposing a safety device between the three-phase input terminal and the first heater connection terminal and between the three-phase input terminal and the first switch , The safety device can be made into a common module together with the three-phase input terminal, heater connection terminal, and switching part, and it can be used for both power specifications for three-phase AC power supply and single-phase AC power supply, improving reliability However, the cost can be reduced.

Further, according to the heater device for a hot water heater of the present invention, the heater control module for the hot water heater and 2 for a single-phase AC power source connected between the first and second heater connection terminals of the heater control module for the hot water heater. In a heater device for a water heater provided with two heater parts, a single-phase AC power source is connected to two of the three-phase input terminals, and two heater parts having substantially the same resistance value are connected with a single-phase AC voltage. When driving, the control unit controls the first switch and the second switch, so that the two heater units are connected in series to the single-phase AC power source connected to the three-phase input terminal, or the two heater units By switching whether one of them is connected, step control with a power ratio of 1: 2 becomes possible.

Further, according to the heater device for a hot water heater of the present invention, the heater control module for the hot water heater and 2 for a single-phase AC power source connected between the first and second heater connection terminals of the heater control module for the hot water heater. In a heater device for a water heater provided with two heater units, two heater units for a single-phase AC power source having substantially the same resistance value, with a single-phase AC power source connected to two of the three-phase input terminals Is driven by a single-phase AC voltage, the control unit controls the first switch and the second switch, so that the single-phase AC power source connected to the three-phase input terminal is connected to the heater pair (the resistance of the other heater unit). By switching between connecting the other heater unit in series or the above heater pair, a 1: 3 power is obtained. Proportional step control is possible That.

Further, according to the heater device for a hot water heater of the present invention, the heater control module for the hot water heater and 2 for a single-phase AC power source connected between the first and second heater connection terminals of the heater control module for the hot water heater. In a heater device for a water heater provided with two heater units, two heater units for a single-phase AC power source having substantially the same resistance value, with a single-phase AC power source connected to two of the three-phase input terminals Is driven by a single-phase AC voltage, the control unit controls the first switch and the second switch, so that the single-phase AC power source connected to the three-phase input terminal is connected to the heater pair (the resistance of the other heater unit). By switching whether the other heater unit is connected in series or the other heater unit is connected 2: 3, two heaters having substantially the same value and resistance value are connected in parallel) The power ratio step control is The ability.

Further, according to the heater device for a hot water heater of the present invention, the heater control module for the hot water heater and 2 for a single-phase AC power source connected between the first and second heater connection terminals of the heater control module for the hot water heater. In a heater device for a water heater having two heater units, a single-phase AC power source is connected to two of the three-phase input terminals, and the two heater units for the single-phase AC power source are connected with a single-phase AC voltage. When driving, the control unit controls the first switch and the second switch, so that one of the two heater units for the single-phase AC power supply is applied to the single-phase AC power supply connected to the three-phase input terminal. A heater pair (two heaters each having substantially the same resistance value and resistance value connected in parallel) and the other heater part are connected in series or only one of the heater pairs. Switch the connection. As a result, the ratio of the power when the heater pair and the other heater unit are connected in series to the power when only one of the heater pairs is connected is 2: 3, and the step control is performed at a power ratio of 2: 3. Is possible.

According to the heater device for a hot water heater of the present invention, the heater control module for the hot water heater and the three-phase AC power supply 3 connected between the first and second heater connection terminals of the heater control module for the hot water heater. In a heater device for a water heater having two heater sections, when the three-phase AC power supply is driven with a three-phase AC power supply connected to the three-phase input terminal, the AC voltage of the three-phase AC power supply is at least in a low voltage region of 230V. By setting the ratio of the resistance value of the heater unit used and the resistance value of the heater unit used in a high voltage region where the AC voltage of the three-phase AC power supply is at least 400V to about 1: 3, the AC voltage of the three-phase AC power supply is 230V, etc. The heating capacity for hot water supply can be made substantially equal in either the low voltage area or the high voltage area such as 400V.

Hereinafter, a heater control module for a water heater and a heater device for a water heater according to the present invention will be described in detail with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1 shows a circuit diagram of a heater device for a hot water heater in which a heater unit is driven by a three-phase AC power source using the heater control module for the hot water heater of the first embodiment of the present invention. A heater device for a water heater provided with this heater control module for a water heater is used for a water heater provided with a heater for heating water.

As shown in FIG. 1, the heater control module for a hot water heater according to the first embodiment includes a three-phase AC power source heater unit that is substantially the same in resistance as the three-phase input terminal 1 to which a three-phase AC power source can be connected. As an example, the first and second heater connecting terminals 2 and 3 to which the heaters R1, R2 and R3 are connected, and the first and second heaters connected between the three-phase input terminal 1 and the second heater connecting terminal 3 are connected. 2 magnet switches M1 and M2 and a controller 11 for controlling the first and second magnet switches M1 and M2. The first and second magnet switches M1 and M2 and the control unit 11 constitute a switching unit. Further, the three-phase input terminal 1, the first and second heater connection terminals 2 and 3, the first and second magnet switches M1 and M2 and the control unit 11 are integrated to form a common module 10 which is a heater control module for a hot water heater. Is forming.

  As shown in FIG. 1, the R-phase of the three-phase AC power supply is connected to the first terminal of the three-phase input terminal 1, the S-phase of the three-phase AC power supply is connected to the second terminal of the three-phase input terminal 1, The T-phase of the three-phase AC power supply is connected to the third terminal of the phase input terminal 1. The first terminal of the three-phase input terminal 1 is connected to the first terminal of the first heater connection terminal 2, the second terminal of the three-phase input terminal 1 is connected to the second terminal of the first heater connection terminal 2, and three The third terminal of the phase input terminal 1 is connected to the third terminal of the first heater connection terminal 2.

  One end of the heater R1 is connected to the first terminal of the first heater connection terminal 2, and the other end of the heater R1 is connected to the first terminal of the second heater connection terminal 3. One end of the heater R2 is connected to the second terminal of the first heater connection terminal 2, and the other end of the heater R2 is connected to the second terminal of the second heater connection terminal 3. One end of the heater R3 is connected to the third terminal of the first heater connection terminal 2, and the other end of the heater R3 is connected to the third terminal of the second heater connection terminal 3.

  The first and second magnet switches M1 and M2 each have three a contacts that open and close simultaneously. The first terminal of the second heater connection terminal 3 is connected to the terminal 1 of the first a contact of the second magnet switch M2. The second terminal of the second heater connection terminal 3 is connected to the terminal 3 of the second a contact of the second magnet switch M2. The third terminal of the second heater connection terminal 3 is connected to the terminal 5 of the third a contact of the second magnet switch M2. The terminal 2 and the terminal 4 of the second magnet switch M2 are connected, and the terminal 4 and the terminal 6 of the second magnet switch M2 are connected.

  The terminal 1 of the first a contact of the second magnet switch M2 and the terminal 6 of the third a contact of the first magnet switch M1 are connected. The terminal 3 of the second a contact of the second magnet switch M2 and the terminal 4 of the second a contact of the first magnet switch M1 are connected. The terminal 5 of the third a contact of the second magnet switch M2 is connected to the terminal 2 of the first a contact of the first magnet switch M1.

  The terminal 1 of the first a contact of the first magnet switch M1 is connected to the first terminal of the three-phase input terminal 1, and the terminal 3 of the second a contact of the first magnet switch M1 is connected to the three-phase input terminal 1. Connected to the third terminal, the terminal 5 of the third a contact of the first magnet switch M1 is connected to the second terminal of the three-phase input terminal 1.

  The control unit 11 includes a first drive circuit 11a that drives the first magnet switch M1 and a second drive circuit 11b that drives the second magnet switch M2.

In the water heater heater device having the heater control module having the above-described configuration, the second magnet switch M2 is turned on by the second drive circuit 11b, while the first magnet switch M1 is turned off by the first drive circuit 11a. Thus, the heaters R1, R2, and R3 are Y-connected to the three-phase AC power supply (R-phase, S-phase, and T-phase) connected to the three-phase input terminal 1. In addition, the first drive circuit 11a turns on the first magnet switch M1, while the second drive circuit 11b turns off the second magnet switch M2, so that the three-phase AC power supply (R The heaters R1, R2, and R3 are Δ-connected to the (phase, S phase, T phase).

  When the switching unit 11 switches on the opposite magnet switch from the state in which one of the first and second magnet switches M1 and M2 is on and the other is off, the first and second magnet switches Control is performed so that both M1 and M2 are switched off after a predetermined time. Accordingly, both the first and second magnet switches M1 and M2 are not turned on at the same time, and it is possible to reliably prevent the occurrence of an abnormality such as a short circuit.

For example, when each resistance value of the heaters R1, R2, and R3 is r and the line voltage is V, the power of the three heaters R1, R2, and R3 in the Y connection is
(V / √3) ² / r × 3 = V ² / r
It is represented by On the other hand, the power of the three heaters R1, R2, R3 in the △ connection is
V ² / r × 3
It is represented by That is, the ratio of the power at the Y connection to the power at the Δ connection is 1: 3.

According to the heater device for a water heater provided with the heater control module having the above-described configuration, three three-phase AC power supplies (R phase, S phase, T phase) connected to the three-phase input terminal 1 have three By switching whether the heaters R1, R2, R3 are Y-connected or △ -connected, it is possible to cope with different power supply specifications with a simple configuration, and without preparing multiple types of heater control modules for hot water heaters. Workability is good and the cost can be reduced.

Further, when driving a three-phase AC power source in which a three-phase AC power source is connected to the three-phase input terminal 1, the resistance values of the heaters R1, R2, and R3 used when the AC voltage of the three-phase AC power source is 230V and the three-phase AC power source. By setting the ratio of the resistance values of the heaters R1, R2, and R3 used when the AC voltage of the power supply is 400V to about 1: 3, hot water supply is possible regardless of whether the AC voltage of the three-phase AC power supply is 230V or 400V. The heating capacity for can be made substantially equal. In the heater device for a water heater provided with the heater control module for the water heater of the present invention, the AC voltage of the three-phase AC power source is not only a constant voltage region of 230V or a high voltage region of 400V, but also 200V, 220V, 240V, etc. May be used in a low voltage area of 380V, a high voltage area such as 380V, 415V, or 460V.

For example, when the AC voltage of a three-phase AC power supply is 230 V, the power of the three heaters R1, R2, and R3 in the Δ connection is r, where the resistance values of the heaters R1, R2, and R3 are r.
230 ² / r × 3 = 52900 × 3 / r = 158700 / r [W]
It is represented by On the other hand, when the AC voltage of the three-phase AC power supply is 230 V, the power of the three heaters R1, R2, and R3 in the Δ connection is 3r when the resistance values of the heaters R1, R2, and R3 are 3r.
400 ² / r = 16,000 / r [W]
The heating capacity for hot water supply is substantially the same regardless of whether the AC voltage of the three-phase AC power supply is 230V or 400V.

FIG. 2 is a circuit diagram of a heater device for a water heater that drives the heater unit with a single-phase AC power source using the heater control module for the water heater. In FIG. 2, the common module 10 shown in FIG. 1 is used.

  The L side of the single-phase AC power supply is connected to the first terminal of the three-phase input terminal 1 of the common module 10, and the N side of the single-phase AC power supply is connected to the second terminal of the three-phase input terminal 1. Further, one end of a heater R11 as an example of a heater section for a single-phase AC power supply is connected to the first terminal of the first heater connection terminal 2, and the other end of the heater R11 is connected to the first terminal of the second heater connection terminal 3. Connected to the terminal. One end of a heater R12 as an example of a heater unit for a single-phase AC power supply is connected to the second terminal of the first heater connection terminal 2, and the other end of the heater R12 is connected to the second terminal of the second heater connection terminal 3. is doing.

In the heater control module for a water heater having the above-described configuration, the second magnet switch M2 is turned on by the second drive circuit 11b, while the first magnet switch M1 is turned off by the first drive circuit 11a. The heaters R11 and R12 are connected in series to the single-phase AC power source connected to the. Further, by turning on the first magnet switch M1 by the first drive circuit 11a and turning off the second magnet switch M2 by the second drive circuit 11b, a single-phase AC power source connected to the three-phase input terminal 1 is supplied. Thus, only the heater R11 is connected.

When the heaters R11 and R12 are connected in series, for example, if the resistance value of the heaters R11 and R12 is r and the line voltage is V, the power of the heaters R11 and R12 is
V ² / (2r)
It is represented by On the other hand, the power of only the heater R11 is
V ² / r
It is represented by That is, the ratio between the power when the heaters R11 and R12 are connected in series and the power when only the heater R11 is connected is 1: 2.

In the heater device for a water heater provided with the heater control module for a water heater shown in FIG. 2, two heaters having substantially the same resistance value are connected to two of the three-phase input terminals 1 with a single-phase AC power supply. When driving R11 and R12 with a single-phase AC voltage, the switching unit 11 connects two heaters R11 and R12 in series to the single-phase AC power source connected to the three-phase input terminal 1, or only the heater R11. By switching whether to connect, step control with a power ratio of 1: 2 becomes possible.

FIG. 3 shows another circuit diagram in which the heater unit is driven by a single-phase AC power source using the heater control module for the hot water heater. The heater control module for hot water heater shown in FIG. 3 has the same configuration as the heater control module for hot water heater shown in FIG. 2 except for the heater R13.

The heater device for a water heater provided with the heater control module for the water heater shown in FIG. 3 is formed by connecting a heater R13 to the heater R11 in parallel to form a heater pair as an example of a heater section for a single-phase AC power supply. This is different from the heater device for the water heater provided with the heater control module for the water heater shown in FIG.

In the water heater heater device having the heater control module having the above-described configuration, the second magnet switch M2 is turned on by the second drive circuit 11b, while the first magnet switch M1 is turned off by the first drive circuit 11a. Thus, the heater pair (R11, R13) and the heater R12 as an example of the heater unit for the single-phase AC power supply are connected in series to the single-phase AC power supply connected to the three-phase input terminal 1. Further, by turning on the first magnet switch M1 by the first drive circuit 11a and turning off the second magnet switch M2 by the second drive circuit 11b, a single-phase AC power source connected to the three-phase input terminal 1 is supplied. Thus, only the heater pair (R11, R13) is connected.

When the heater pair (R11, R13) and the heater R12 are connected in series, for example, if each resistance value of the heaters R11, R12, R13 is r and the line voltage is V, the power of the heaters R11, R12, R13 Is
V ² / (r + r / 2)
It is represented by On the other hand, the power of only the heater pair (R11, R13)
V ² / (r / 2)
It is represented by That is, the ratio of the power when the heater pair (R11, R13) and the heater R12 are connected in series to the power when only the heater pair (R11, R13) is
^{V 2 / (r + r /} 2): V 2 / (r / 2) = 1: 3
It becomes.

The heater device for a water heater provided with the heater control module for the water heater shown in FIG. 3 has three heaters having substantially the same resistance value by connecting a single-phase AC power source to two of the three-phase input terminals 1. When driving R11, R12, and R13 with a single-phase AC voltage, the switching unit 11 connects the heater pair (R11, R13) and the other heater R12 to the single-phase AC power source connected to the three-phase input terminal. By switching between connecting in series or connecting only the heater pair (R11, R13), step control with a power ratio of 1: 3 becomes possible.

Also, Figure 4 shows another circuit diagram of a water heater for heater control device for driving the heater unit in the single-phase AC power source using a heater control module for the water heater. The heater device for a water heater provided with the heater control module for the water heater shown in FIG. 3 has the same configuration as the heater device for the water heater provided with the heater control module for the water heater shown in FIG. 2 except for the heater R13. Yes.

The heater device for a water heater provided with the heater control module for a water heater shown in FIG. 4 is formed by connecting a heater R13 to the heater R12 in parallel to form a heater pair as an example of a heater section for a single-phase AC power supply. This is different from the heater control module for the water heater shown in FIG.

In the water heater heater device having the heater control module having the above-described configuration, the second magnet switch M2 is turned on by the second drive circuit 11b, while the first magnet switch M1 is turned off by the first drive circuit 11a. Thus, the heater R11 and the heater pair (R12, R13) are connected in series to the single-phase AC power source connected to the three-phase input terminal 1. Further, by turning on the first magnet switch M1 by the first drive circuit 11a and turning off the second magnet switch M2 by the second drive circuit 11b, a single-phase AC power source connected to the three-phase input terminal 1 is supplied. Thus, only the heater R11 is connected.

When the heater R11 and the heater pair (R12, R13) are connected in series, for example, assuming that the resistance values of the heaters R11, R12, R13 are r and the line voltage is V, the power of the heaters R11, R12, R13 Is
V ² / (r + r / 2)
It is represented by On the other hand, the power of only the heater R11 is
V ² / r
It is represented by That is, the ratio of the power when the heater R11 and the heater pair (R12, R13) are connected in series to the power when only the heater R11 is
^{V 2 / (r + r /} 2): V 2 / r = 2: 3
It becomes.

The heater device for a water heater provided with the heater control module for the water heater shown in FIG. 4 has three heaters having substantially the same resistance value by connecting a single-phase AC power source to two of the three-phase input terminals 1. When driving R11, R12, and R13 with a single-phase AC voltage, the switching unit 11 connects the heater pair (R12, R13) and the other heater R11 to the single-phase AC power source connected to the three-phase input terminal. By switching between connecting in series or connecting only the other heater R11, step control of a power ratio of 2: 3 is possible.

[Second Embodiment]
FIG. 5 shows a circuit diagram of a heater device for a hot water heater in which the heater unit is driven by a three-phase AC power source using the heater control module for the hot water heater of the second embodiment of the present invention. A heater device for a water heater provided with this heater control module for a water heater is used for a water heater provided with a heater for heating water.

As shown in FIG. 5, the heater control module for a hot water heater of the second embodiment includes a three-phase AC power source heater unit that is substantially the same in resistance as the three-phase input terminal 1 to which a three-phase AC power source can be connected. An example of a shut-off device connected between the first and second heater connecting terminals 2 and 3 to which the heaters R1, R2 and R3 are connected as an example, and between the three-phase input terminal 1 and the first heater connecting terminal 2 A third magnet switch M3, first and second magnet switches M1, M2 connected between the third magnet switch M3 and the second heater connection terminal 3, and the first and second magnet switches M1, A control unit 111 that controls M2 and an abnormality detection terminal 4 connected to the control unit 111 are provided. The first to third magnet switches M1, M2, M3 and the control unit 111 constitute a switching unit. Further, the three-phase input terminal 1, the first and second heater connection terminals 2 and 3, the abnormality detection terminal 4, the first to third magnet switches M1, M2, and M3 and the control unit 111 are integrated to form a common module 110. Is forming.

  As shown in FIG. 5, the R-phase of the three-phase AC power supply is connected to the first terminal of the three-phase input terminal 1, the S-phase of the three-phase AC power supply is connected to the second terminal of the three-phase input terminal 1, The T-phase of the three-phase AC power supply is connected to the third terminal of the phase input terminal 1.

  The first to third magnet switches M1, M2, and M3 each have three a contacts that simultaneously open and close. The first terminal of the three-phase input terminal 1 is connected to the terminal 1 of the first a contact of the third magnet switch M3, and the terminal 2 of the first a contact of the third magnet switch M3 is connected to the first heater connection terminal. 2 is connected to the first terminal. The second terminal of the three-phase input terminal 1 is connected to the terminal 3 of the second a contact of the third magnet switch M3, and the terminal 4 of the second a contact of the third magnet switch M3 is connected to the first heater connection terminal. 2 is connected to the second terminal. The third terminal of the three-phase input terminal 1 is connected to the third a contact terminal 5 of the third magnet switch M3, and the third a contact terminal 6 of the third magnet switch M3 is connected to the first heater connection terminal. 2 is connected to the third terminal.

  The first b contact of the first overheat detection device 21 is connected to the first terminal of the first heater connection terminal 2 by connecting the terminal 1 of the first b contact of the first overheat detection device 21 as an example of a safety device. One end of the heater R 1 is connected to the terminal 2, and the other end of the heater R 1 is connected to the first terminal of the second heater connection terminal 3. The second b-contact terminal 3 of the first overheat detection device 21 is connected to the second terminal of the first heater connection terminal 2, and the second b-contact terminal 4 of the first overheat detection device 21 is connected to the terminal 4 of the heater R2. One end is connected, and the other end of the heater R2 is connected to the second terminal of the second heater connection terminal 3. The first b contact of the second overheat detection device 22 is connected to the third terminal of the first heater connection terminal 2 by connecting the terminal 1 of the first b contact of the second overheat detection device 22 as an example of a safety device. Terminal 2 is connected to one end of the heater R 3, and the other end of the heater R 3 is connected to the third terminal of the second heater connection terminal 3.

  Bimetal thermostats are used for the first and second overheat detection devices 21 and 22, and the first and second contacts of each overheat detection device perform an opening operation in conjunction with overheating.

  The first terminal of the second heater connection terminal 3 is connected to the terminal 1 of the first a contact of the second magnet switch M2. The second terminal of the second heater connection terminal 3 is connected to the terminal 3 of the second a contact of the second magnet switch M2. The third terminal of the second heater connection terminal 3 is connected to the terminal 5 of the third a contact of the second magnet switch M2. The terminal 2 and the terminal 4 of the second magnet switch M2 are connected, and the terminal 4 and the terminal 6 of the second magnet switch M2 are connected.

  The terminal 1 of the first a contact of the second magnet switch M2 and the terminal 6 of the third a contact of the first magnet switch M1 are connected. The terminal 3 of the second a contact of the second magnet switch M2 and the terminal 4 of the second a contact of the first magnet switch M1 are connected. The terminal 5 of the third a contact of the second magnet switch M2 is connected to the terminal 2 of the first a contact of the first magnet switch M1.

  The terminal 1 of the first a contact of the first magnet switch M1 is connected to the second terminal of the third magnet switch M3, and the terminal 3 of the second a contact of the first magnet switch M1 is connected to the third magnet switch M3. Connected to the sixth terminal, the terminal 5 of the third a contact of the first magnet switch M1 is connected to the fourth terminal of the third magnet switch M3.

  The control unit 111 includes a first drive circuit 111a that drives the first magnet switch M1, a second drive circuit 111b that drives the second magnet switch M2, and a third drive circuit 111c that drives the third magnet switch M3. And an abnormality detection circuit 111d.

  The first terminal of the abnormality detection terminal 4 is connected to one input of the abnormality detection circuit 111d, and the first terminal of the abnormality detection terminal 4 is connected to the terminal 3 of the second b contact of the second overheat detection device 22. is doing. Further, the second terminal of the abnormality detection terminal 4 is connected to the terminal 4 of the second b contact of the second overheat detection device 22, and the second terminal of the abnormality detection terminal 4 is connected to the other input of the abnormality detection circuit 111d. Connected.

  When the second overheat detection device 22 detects an overheat state and operates, the b contact between the terminals 1 and 2 and between the terminals 3 and 4 opens, and the b contact between the terminals 3 and 4 of the second overheat detection device 22 opens. By the opening operation, the abnormality detection circuit 111d outputs an abnormality signal to the third drive circuit 111c. In response to the abnormality signal from the abnormality detection circuit 111d, the third drive circuit 111c turns off the third magnet switch M3 to cut off the AC voltage from the three-phase AC power supply.

  When the first overheat detection device 21 operates by detecting an overheat state, the b contact between the terminals 1 and 2 and the terminals 3 and 4 of the first overheat detection device 21 is opened, and the voltage to the heaters R1 and R2 Supply is cut off.

  Here, if the set value (overheat protection value) of the overheat detection temperature of the second overheat detection device 22 is set lower than the set value (overheat protection value) of the overheat detection temperature of the first overheat detection device 21, Since the second overheat detection device operates faster than the first overheat detection device and the voltage supply to all the heaters is cut off, a safer system can be provided for overheat protection.

In the heater device for a water heater provided with the heater control module having the above-described configuration, the second drive circuit 111b and the third drive circuit 111c turn on the second and third magnet switches M2 and M3, while the first drive circuit. By turning off the first magnet switch M1 by 111a, the three-phase AC power heaters R1, R2 for the three-phase AC power supply (R-phase, S-phase, T-phase) connected to the three-phase input terminal 1 are used. , R3 is Y-connected. Further, the first drive circuit 111a and the third drive circuit 111c turn on the first and third magnet switches M1 and M3, while the second drive circuit 111b turns off the second magnet switch M2, thereby providing a three-phase input terminal. The three-phase AC power heaters R1, R2, and R3 are Δ connected to the three-phase AC power source (R phase, S phase, and T phase) connected to 1.

In the heater device for a water heater provided with the heater control module for the water heater, the ratio between the power at the Y connection and the power at the Δ connection is 1: 3 as in the first embodiment.

Furthermore, in the heater control module for a hot water heater, a third magnet switch M3 provided between the three-phase input terminal 1 and the first heater connection terminal 2 and closer to the three-phase input terminal 1 than the magnet switches (M1, M2). By interrupting the AC voltage from the three-phase AC power source in the event of an abnormality, damage to circuits such as the heaters R1, R2, R3 and the switching unit can be minimized.

  In addition, the first and second overheat detecting devices 21 and 22 that detect the overheated state of the heaters R1, R2, and R3 disconnect the connection between the three-phase AC power source and the heaters R1, R2, and R3, so that the heater R1 , R2, R3 can be prevented from deterioration and damage to circuits such as the heaters R1, R2, R3 and the switching unit against abnormal overheating, and reliability can be improved.

  When the switching unit 111 switches on the opposite magnet switch from the state in which one of the first and second magnet switches M1 and M2 is on and the other is off, the first and second magnet switches Control is performed so that both M1 and M2 are switched off after a predetermined time. Accordingly, both the first and second magnet switches M1 and M2 are not turned on at the same time, and it is possible to reliably prevent the occurrence of an abnormality such as a short circuit.

  The switching unit 111 turns off the third magnet switch M3 when turning on the opposite magnet switch from the state in which one of the first and second magnet switches M1 and M2 is on and the other is off. Control is performed so that the first and second magnet switches M1 and M2 are switched after a predetermined time has elapsed. Alternatively, when the switching unit 111 switches on the reverse magnet switch from the state in which one of the first and second magnet switches M1 and M2 is on and the other is off, Control is performed so that all of the magnet switches M1, M2, and M3 are switched to the OFF state after a predetermined time. Thereby, even when both the first and second magnet switches M1 and M2 are simultaneously turned on at the time of switching, it is possible to reliably prevent the occurrence of an abnormality such as a short circuit.

In addition, the heater apparatus for water heaters provided with the heater control module for water heaters of the said 2nd Embodiment is the heater apparatus for water heaters provided with the heater control module for water heaters shown in FIGS. 2-4 of 1st Embodiment. Similarly to the above, the heater unit can be driven by a single-phase AC power source.

FIG. 6 shows a circuit diagram of another example of a heater device for a water heater provided with the heater control module for the water heater of the second embodiment. The heater device for a water heater provided with the heater control module for the water heater shown in FIG. 6 has the same configuration as the heater device for the water heater provided with the heater control module for the water heater shown in FIG. 5 except for the overheat detection device. ing.

  As shown in FIG. 6, a first b-contact terminal 1 of a first overheat detection device 21 as an example of a safety device is connected to the first terminal of the first heater connection terminal 2, and the first overheat detection device 21 is connected. One end of the heater R 1 is connected to the terminal 2 of the first b contact, and the other end of the heater R 1 is connected to the first terminal of the second heater connection terminal 3.

  Further, the terminal 1 of the first b contact of the second overheat detection device 22 is connected to the second terminal of the first heater connection terminal 2, and the heater is connected to the terminal 2 of the first b contact of the second overheat detection device 22. One end of R2 is connected, and the other end of the heater R2 is connected to the second terminal of the second heater connection terminal 3.

  In addition, the terminal 1 of the first b contact of the third overheat detection device 23 as an example of a safety device is connected to the third terminal of the first heater connection terminal 2, and the first of the third overheat detection device 23 is connected. The terminal 2 of the b contact is connected to one end of the heater R3, and the other end of the heater R3 is connected to the third terminal of the second heater connection terminal 3.

  The first to third overheat detection devices 21 to 23 detect the overheat state of the heaters R1, R2, and R3 using a bimetal thermostat. At the time of overheating, the first and second contacts of each overheat detecting device perform an opening operation in conjunction with each other.

  The first terminal of the abnormality detection terminal 4 is connected to one input of the abnormality detection circuit 111d, and the first terminal of the abnormality detection terminal 4 is connected to the terminal 3 of the second b contact of the first overheat detection device 21. is doing. The second b contact terminal 4 of the second overheat detection device 22 is connected to the second b contact terminal 4 of the second overheat detection device 22 and the second b contact terminal 3 of the second overheat detection device 22. 4 and the terminal 3 of the second b contact of the third overheat detecting device 23 are connected. Then, the second terminal of the abnormality detection terminal 4 is connected to the terminal 4 of the second b contact of the third overheat detection device 23, and the second terminal of the abnormality detection terminal 4 is connected to the other input of the abnormality detection circuit 111d. Connected. When at least one of the first to third overheat detection devices 21 to 23 detects an overheat state and operates, the b-contact between the terminals 1 and 2 and between the terminals 3 and 4 opens, and the first to third overheat detection devices 21. The abnormality detection circuit 111d outputs an abnormality signal to the third drive circuit 111c by the opening operation of the b contact between any of the terminals 3 and 4 of .about.23.

The water heater heater device provided with the water heater heater control module shown in FIG. 6 has the same effect as the water heater heater device provided with the water heater heater control module shown in FIG. When at least one of the third overheat detecting devices 21 to 23 detects the overheated state of the heaters R1, R2, and R3 and operates, the third magnet switch M3 is turned off, and the AC voltage from the three-phase AC power source is reliably obtained in the event of an abnormality. Can be blocked.

[Third Embodiment]
FIG. 7 shows a circuit diagram of a heater device for a water heater that drives a heater portion with a three-phase AC power source using the heater control module for a water heater according to the third embodiment of the present invention. The third water heater heater apparatus having a heater control module water heater embodiment, first, the heater control module water heater shown in FIG. 2 of the first embodiment except for the second magnet switch and the control unit The same configuration as that of the heater device for a water heater provided with the same reference numerals is assigned to the same components, and the description thereof is omitted.

The heater control module for hot water heater shown in FIG. 7 is different from the heater control module for hot water heater shown in FIG. 2 in the circuit for driving the first and second magnet switches M11 and M12.

  That is, one end of the drive coil CL1 of the first magnet switch M11 is connected to one of the control outputs of the first drive circuit 211a, and the other end of the drive coil CL1 is connected to the terminal 8 of the b contact of the second magnet switch M12. The terminal 7 of the b contact of the second magnet switch M12 is connected to the other control output of the first drive circuit 211a.

  One end of the drive coil CL2 of the second magnet switch M12 is connected to one of the control outputs of the second drive circuit 211b, and the other end of the drive coil CL2 is connected to the terminal 8 of the b contact of the first magnet switch M11. The terminal 7 of the b contact of the first magnet switch M11 is connected to the other control output of the second drive circuit 211b.

  As a result, when one of the first and second magnet switches M11 and M12 is in the on operation, the b contact between the terminals 7 and 8 on the on operation side is open. The circuits 211a and 211b cannot turn on the other of the first and second magnet switches M11 and M12. That is, one of the first and second magnet switches M11 and M12 is turned on unless both the first and second magnet switches M11 and M12 are off and the contact b between the terminals 7 and 8 is closed. I can't.

  Therefore, the first and second magnet switches M11 and M12 are not turned on at the same time, and a short circuit between the power supply lines can be reliably prevented.

  In the said 3rd Embodiment, although the interruption | blocking apparatus (a 3rd magnet switch M3 as an example) and the overheat detection apparatus are not provided, you may provide them.

[Fourth Embodiment]
FIG. 8 shows a circuit diagram of a heater device for a hot water heater in which the heater unit is driven by a three-phase AC power source using the heater control module for the hot water heater of the fourth embodiment of the present invention. The heater control module for the hot water heater of the fourth embodiment has the same configuration as the heater control module for the hot water heater of the second embodiment except for the overheat detection device, and the same components are denoted by the same reference numerals. ing. A heater device for a water heater provided with this heater control module for a water heater is used for a water heater provided with a heater for heating water.

As shown in FIG. 8, the heater control module for a hot water heater of the fourth embodiment includes a three-phase AC power source heater unit that can be connected to a three-phase AC power source, and a three-phase AC power source heater unit having substantially the same resistance value. An example of a shut-off device connected between the first and second heater connecting terminals 2 and 3 to which the heaters R1, R2 and R3 are connected as an example, and between the three-phase input terminal 1 and the first heater connecting terminal 2 A third magnet switch M3, first and second magnet switches M1, M2 connected between the third magnet switch M3 and the second heater connection terminal 3, and the first and second magnet switches M1, The control part 111 which controls M2, and the 1st, 2nd overheat detection apparatuses 21 and 22 as an example of the safety device connected between the 3rd magnet switch M3 and the 1st heater connection terminal 2 are provided. . The first to third magnet switches M1, M2, M3 and the control unit 111 constitute a switching unit. The three-phase input terminal 1, the first and second heater connection terminals 2, 3, the first to third magnet switches M 1, M 2, M 3, the first and second overheat detection devices 21, 22 and the control unit 111 are integrated. The common module 310 is formed.

  As shown in FIG. 8, the R-phase of the three-phase AC power supply is connected to the first terminal of the three-phase input terminal 1, the S-phase of the three-phase AC power supply is connected to the second terminal of the three-phase input terminal 1, The T-phase of the three-phase AC power supply is connected to the third terminal of the phase input terminal 1.

  The first to third magnet switches M1, M2, and M3 each have three a contacts that simultaneously open and close. The first terminal of the three-phase input terminal 1 is connected to the terminal 1 of the first a contact of the third magnet switch M3, and the terminal 2 of the first a contact of the third magnet switch M3 is connected to the first overheat detecting device. 21 is connected to the terminal 1 of the first b contact. The terminal 2 of the first b contact of the first overheat detection device 21 is connected to the first terminal of the first heater connection terminal 2. The second terminal of the three-phase input terminal 1 is connected to the terminal 3 of the second a contact of the third magnet switch M3, and the terminal 4 of the second a contact of the third magnet switch M3 is connected to the first overheat detecting device. 21 is connected to the terminal 3 of the second b contact. The terminal 4 of the second b contact of the first overheat detection device 21 is connected to the second terminal of the first heater connection terminal 2. The third terminal of the three-phase input terminal 1 is connected to the terminal 5 of the third a contact of the third magnet switch M3, and the terminal 6 of the third a contact of the third magnet switch M3 is connected to the second overheat. It is connected to the terminal 1 of the first b contact of the detection device 22. The terminal 2 of the first b contact of the second overheat detection device 22 is connected to the third terminal of the first heater connection terminal 2.

  One end of the heater R1 is connected to the first terminal of the first heater connection terminal 2, and the other end of the heater R1 is connected to the first terminal of the second heater connection terminal 3. One end of the heater R2 is connected to the second terminal of the first heater connection terminal 2, and the other end of the heater R2 is connected to the second terminal of the second heater connection terminal 3. One end of the heater R3 is connected to the third terminal of the first heater connection terminal 2, and the other end of the heater R3 is connected to the third terminal of the second heater connection terminal 3.

  Bimetal thermostats are used for the first and second overheat detection devices 21 and 22, and the first and second contacts of each overheat detection device perform an opening operation in conjunction with overheating.

  The first terminal of the second heater connection terminal 3 is connected to the terminal 1 of the first a contact of the second magnet switch M2. The second terminal of the second heater connection terminal 3 is connected to the terminal 3 of the second a contact of the second magnet switch M2. The third terminal of the second heater connection terminal 3 is connected to the terminal 5 of the third a contact of the second magnet switch M2. The terminal 2 and the terminal 4 of the second magnet switch M2 are connected, and the terminal 4 and the terminal 6 of the second magnet switch M2 are connected.

  The terminal 1 of the first a contact of the second magnet switch M2 and the terminal 6 of the third a contact of the first magnet switch M1 are connected. The terminal 3 of the second a contact of the second magnet switch M2 and the terminal 4 of the second a contact of the first magnet switch M1 are connected. The terminal 5 of the third a contact of the second magnet switch M2 is connected to the terminal 2 of the first a contact of the first magnet switch M1.

  The terminal 1 of the first a contact of the first magnet switch M1 is connected to the terminal 2 of the first b contact of the first overheat detection device 21. The terminal 3 of the second a contact of the first magnet switch M1 is connected to the terminal 2 of the first b contact of the second overheat detection device 22. The terminal 5 of the third a contact of the first magnet switch M1 is connected to the terminal 4 of the second b contact of the first overheat detection device 21.

  The control unit 111 includes a first drive circuit 111a that drives the first magnet switch M1, a second drive circuit 111b that drives the second magnet switch M2, and a third drive circuit 111c that drives the third magnet switch M3. And an abnormality detection circuit 111d.

  One input of the abnormality detection circuit 111d is connected to the terminal 3 of the second b contact of the second overheat detection device 22. Further, the terminal 4 of the second b contact of the second overheat detection device 22 is connected to the other input of the abnormality detection circuit 111d.

  When the second overheat detection device 22 detects an overheat state and operates, the b contact between the terminals 1 and 2 and between the terminals 3 and 4 opens, and the b contact between the terminals 3 and 4 of the second overheat detection device 22 opens. By the opening operation, the abnormality detection circuit 111d outputs an abnormality signal to the third drive circuit 111c. In response to the abnormality signal from the abnormality detection circuit 111d, the third drive circuit 111c turns off the third magnet switch M3 to cut off the AC voltage from the three-phase AC power supply.

  When the first overheat detection device 21 operates by detecting an overheat state, the b contact between the terminals 1 and 2 and the terminals 3 and 4 of the first overheat detection device 21 is opened, and the voltage to the heaters R1 and R2 Supply is cut off.

  Here, if the set value (overheat protection value) of the overheat detection temperature of the second overheat detection device 22 is set lower than the set value (overheat protection value) of the overheat detection temperature of the first overheat detection device 21, Since the second overheat detection device operates faster than the first overheat detection device and the voltage supply to all the heaters is cut off, a safer system can be provided for overheat protection.

In the heater device for a water heater provided with the heater control module having the above-described configuration, the second drive circuit 111b and the third drive circuit 111c turn on the second and third magnet switches M2 and M3, while the first drive circuit. By turning off the first magnet switch M1 by 111a, the three-phase AC power heaters R1, R2 for the three-phase AC power supply (R-phase, S-phase, T-phase) connected to the three-phase input terminal 1 are used. , R3 is Y-connected. Further, the first drive circuit 111a and the third drive circuit 111c turn on the first and third magnet switches M1 and M3, while the second drive circuit 111b turns off the second magnet switch M2, thereby providing a three-phase input terminal. The three-phase AC power heaters R1, R2, and R3 are Δ connected to the three-phase AC power source (R phase, S phase, and T phase) connected to 1.

The heater device for a water heater provided with the heater control module for the water heater according to the fourth embodiment has the same effect as the heater device for a water heater provided with the heater control module for the water heater according to the second embodiment.

In addition, the heater apparatus for water heaters provided with the heater control module for water heaters of the said 4th Embodiment is the heater apparatus for water heaters provided with the heater control module for water heaters shown in FIGS. 2-4 of 1st Embodiment. Similarly to the above, the heater unit can be driven by a single-phase AC power source.

Also, FIG. 9A shows a water heater for heater control module another circuit diagram for driving a single-phase AC power supply to the heater portion with the heater control module for the water heater.

The heater device for a water heater provided with the heater control module for a water heater shown in FIG. 9A has one end of the heater R11 connected to the first terminal of the first heater connection terminal 2, and the other end of the heater R11 connected to the second heater connection terminal. 3 to the first terminal. One end of the heater R12 is connected to the second terminal of the first heater connection terminal 2, and the other end of the heater R12 is connected to the second terminal of the second heater connection terminal 3. One end of the heater R12 is connected to one end of the heater R13, and the other end of the heater R13 is connected to the third terminal of the second heater connection terminal 3. A heater pair as an example of a heater section for a single-phase AC power supply is formed by connecting a heater R13 in parallel with the heater R12.

In the heater device for a water heater provided with the heater control module having the above-described configuration, the second drive circuit 111b and the third drive circuit 111c turn on the second and third magnet switches M2 and M3, while the first drive circuit. The heater R11 and the heater pair (R12, R13) are connected in series to the single-phase AC power source connected to the three-phase input terminal 1 by turning off the first magnet switch M1 by 111a. Further, the first and third magnet switches M1 and M3 are turned on by the second drive circuit 111b and the third drive circuit 111c, while the second magnet switch M2 is turned off by the second drive circuit 111b, so that the three-phase input terminal is turned on. Only the heater R11 is connected to the single-phase AC power source connected to 1.

A heater apparatus for a water heater provided with a heater control module for a water heater shown in FIG. 9A has three heaters having substantially the same resistance value by connecting a single-phase AC power source to two of the three-phase input terminals 1. When driving R11, R12, and R13 with a single-phase AC voltage, the switching unit 111 connects the heater pair (R12, R13) and the other heater R11 to the single-phase AC power source connected to the three-phase input terminal. By switching between connecting in series or connecting only the other heater R11, step control of a power ratio of 2: 3 is possible.

  In the heater device for a hot water heater of the fourth embodiment, the second terminal of the first heater connection terminal 2 is connected to one end of the heater R13, and the other end of the heater R13 is the third terminal of the second heater connection terminal 3. However, as shown in FIG. 9B, the heater R13 may be connected in parallel to the heater R11. In this case, step control with a power ratio of 1: 3 is possible.

[Fifth Embodiment]
FIG. 10A shows a circuit diagram of a heater device for a hot water heater that drives a heater portion with a single-phase AC power source using the heater control module for a hot water heater of the fifth embodiment of the present invention. The heater device for a water heater provided with the heater control module for the water heater of the fifth embodiment is different from the heater control module for the water heater shown in FIG. 5 of the second embodiment except for the power supply side connection of the first overheat detecting device. It has the same configuration as the heater device for the hot water heater provided. A heater device for a water heater provided with this heater control module for a water heater is used for a water heater provided with a heater for heating water.

In the heater device for a water heater of the fifth embodiment, the L side of the single-phase AC power supply is connected to the second terminal of the three-phase input terminal 1 of the common module 110, and the single-phase AC is connected to the third terminal of the three-phase input terminal 1. The N side of the power supply is connected. Further, the difference from the heater control module for water heater shown in FIG. 5 is that the first terminal of the first heater connection terminal 2 and the terminal 1 of the first b contact of the first overheat detecting device 21 are not connected. The first b-contact terminal 1 of the first overheat detecting device 21 is connected to the second b-contact terminal 3.

A heater apparatus for a water heater provided with a heater control module for a water heater shown in FIG. 10A has three heaters having substantially the same resistance value by connecting a single-phase AC power source to two of the three-phase input terminals 1. When driving R11, R12, and R13 with a single-phase AC voltage, the switching unit 111 connects the heater pair (R11, R12) and the other heater R13 to the single-phase AC power source connected to the three-phase input terminal. By switching between connecting in series or connecting only the heater R12, step control of a power ratio of 2: 3 becomes possible.

  According to the heater device for a water heater in the fifth embodiment, it has the same effect as the heater device for a water heater in the second embodiment.

  The heater device for a hot water heater of the fifth embodiment is used when the overheat detection device 21 is activated by connecting two wires connected to the heater pair (R11, R12) to one overheat detection device 21. Since energization to either of the pair of heaters connected in parallel is cut off, energization to all the heaters R11, R12, R13 can be cut off as a result.

  Further, the heater device for a water heater of the fifth embodiment is similarly applied to a heater connection with a power ratio of 1: 1 as shown in FIG. 2 and a heater connection with a power ratio of 2: 3 as shown in FIG. Is possible.

  Further, as shown in FIG. 10B, the other end of the heater R11 may be connected to the other end of the heater R12 without connecting the other end of the heater R11 to the first terminal of the second heater connection terminal 3. In this case, step control with a power ratio of 1: 3 is possible.

[Sixth Embodiment]
FIG. 11A shows a circuit diagram of a heater device for a hot water heater that uses a heater control module for a hot water heater according to a sixth embodiment of the present invention to drive the heater section with a single-phase AC power supply. The sixth water heater heater apparatus having a heater control module water heater embodiments, a heater control module water heater shown in FIG. 10A of the fifth embodiment except for the connection of heater pairs and overheat detection device It has the same configuration as the heater device for the hot water heater. A heater device for a water heater provided with this heater control module for a water heater is used for a water heater provided with a heater for heating water.

In the heater device for a water heater of the sixth embodiment, the L side of the single-phase AC power supply is connected to the second terminal of the three-phase input terminal 1 of the common module 110, and the single-phase AC is connected to the third terminal of the three-phase input terminal 1. The N side of the power supply is connected. Further, the difference from the heater control module for hot water heater shown in FIG. 10A is as follows.

(i) Without connecting the first terminal of the first heater connection terminal 2 and the terminal 1 of the first b contact of the first overheat detection device 21, the first terminal of the first heater connection terminal 2 and the first terminal The point which has connected with the terminal 1 of the 1st b contact of the overheat detection apparatus 21. FIG.
(ii) One end of the heater R12 is not connected to the terminal 4 of the second b contact of the first overheat detection device 21 but connected to the terminal 2 of the first b contact of the first overheat detection device 21. .
(iii) The first terminal of the abnormality detection terminal 4 and the terminal 3 of the second b contact of the first overheat detection device 21 are connected, and the terminal 4 of the second b contact of the first overheat detection device 21 and the second 2 The point of connecting the terminal 3 of the second b contact of the overheat detection device 22.

A heater device for a water heater provided with a heater control module for a water heater shown in FIG. 11A has three heaters having substantially the same resistance value by connecting a single-phase AC power source to two of the three-phase input terminals 1. When driving R11, R12, and R13 with a single-phase AC voltage, the switching unit 111 connects the heater pair (R11, R12) and the other heater R13 to the single-phase AC power source connected to the three-phase input terminal. By switching between connecting in series or connecting only one of the heater pairs (heater R12), step control of a power ratio of 2: 3 becomes possible.

  According to the heater device for a water heater in the sixth embodiment, it has the same effect as the heater device for a water heater in the second embodiment.

  Moreover, according to the heater device for a hot water heater of the sixth embodiment, when one of the first and second overheat detection devices 21 and 22 detects overheating, the third magnet switch M3 is in an open state. The heaters R11, R12, and R13 are not energized. As a result, the single-phase power supply is cut off on the most power supply side, so that any of the heaters R11, R12, R13, the first and second overheat detection devices 21, 22 and the subsequent stage of the third magnet switch M3 of the common module 110 can be used. Since no voltage is applied, there is no risk of electric shock.

  Further, the heater device for a hot water heater of the sixth embodiment is similarly applied to a heater connection with a power ratio of 1: 1 as shown in FIG. 2 and a heater connection with a power ratio of 2: 3 as shown in FIG. Is possible.

  Further, as shown in FIG. 11B, the other end of the heater R11 may be connected to the other end of the heater R12 without connecting the other end of the heater R11 to the first terminal of the second heater connection terminal 3. In this case, step control with a power ratio of 1: 3 is possible.

  In the first to sixth embodiments, each of the heater portions is a single heater portion including a single heater R1, R2, R3, R11, R12, R13, or two heaters are connected in parallel to form a heater pair. However, at least one heater unit may be configured by combining three or more heaters.

  In the first to sixth embodiments, the example using the magnet switch (M1, M2, M3) as the switching unit is shown. However, the present invention is not limited to the magnet switch, and for example, a semiconductor switch may be used. .

FIG. 1 is a circuit diagram of a heater device for a hot water heater in which a heater unit is driven by a three-phase AC power source using the heater control module for the hot water heater according to the first embodiment of the present invention. FIG. 2 is a circuit diagram of a heater device for a water heater that drives the heater unit with a single-phase AC power source using the heater control module for the water heater. FIG. 3 is another circuit diagram of a heater device for a water heater that drives the heater unit with a single-phase AC power source using the heater control module for the water heater. FIG. 4 is another circuit diagram of a heater device for a water heater that drives the heater unit with a single-phase AC power source using the heater control module for the water heater. FIG. 5 is a circuit diagram of a heater device for a water heater that uses a heater control module for a water heater according to the second embodiment of the present invention to drive the heater unit with a three-phase AC power source. FIG. 6 is a circuit diagram showing another example of a heater device for a water heater provided with the heater control module for the water heater according to the second embodiment. FIG. 7 is a circuit diagram of a heater device for a water heater that uses a heater control module for a water heater according to a third embodiment of the present invention to drive the heater unit with a three-phase AC power source. FIG. 8 is a circuit diagram of a heater device for a water heater that uses a heater control module for a water heater according to a fourth embodiment of the present invention to drive the heater unit with a three-phase AC power source. FIG. 9A is a circuit diagram illustrating another example of a heater device for a water heater provided with the heater control module for the water heater according to the fourth embodiment. FIG. 9B is a circuit diagram of a heater device for a water heater in another example of the fifth embodiment. FIG. 10A is a circuit diagram of a heater device for a hot water heater that drives a heater portion with a single-phase AC power source using the heater control module for a hot water heater of the fifth embodiment of the present invention. FIG. 10B is a circuit diagram of a heater device for a water heater in another example of the fifth embodiment. FIG. 11A is a circuit diagram of a heater device for a water heater that drives a heater portion with a single-phase AC power source using the heater control module for a water heater according to the sixth embodiment of the present invention. FIG. 11B is a circuit diagram of a heater device for a water heater in another example of the sixth embodiment.

DESCRIPTION OF SYMBOLS 1 ... Three-phase input terminal 2 ... 1st heater connection terminal 3 ... 2nd heater connection terminal 4 ... Abnormality detection terminal M1, M11 ... 1st magnet switch M2, M12 ... 2nd magnet switch M3 ... 3rd magnet switch 11, 111, 211: Control unit 11a, 111a, 211a ... First drive circuit 11b, 111b, 211b ... Second drive circuit 111c ... Third drive circuit 111d ... Abnormality detection circuit 10, 110, 210, 310 ... Common module 21 ... First DESCRIPTION OF SYMBOLS 1 Overheat detection device 22 ... 2nd overheat detection device 23 ... 3rd overheat detection device R1, R2, R3, R11, R12, R13 ... Heater

Claims (9)

For water heaters used in water heaters equipped with three heater sections (R1, R2, R3) for three-phase AC power supply for heating water or two heater sections (R11, R12, R13) for single-phase AC power supplies A heater control device,
A three-phase input terminal (1) to which a three-phase AC power supply can be connected;
A heater connection terminal (2, 3) to which the three heater sections (R1, R2, R3) for the three-phase AC power supply or the two heater sections (R11, R12, R13) for the single-phase AC power supply are connected; ,
The three-phase AC power source is connected to the three-phase input terminal (1), and the three heaters (R1, R2, R3) for the three-phase AC power source having substantially the same resistance value are supplied with a three-phase AC voltage. When driving, the three heater parts (R1, R2, R3) for the three-phase AC power supply are Y-connected to the three-phase AC power supply connected to the three-phase input terminal (1) or ΔWhether to connect or not, a single-phase AC power supply is connected to two of the three-phase input terminals, and the two heater units (R11, R12, R13) for the single-phase AC power supply are single-phased. When driving with AC voltage, the two heater units (R11, R12, R13) for the single-phase AC power supply are connected in series to the single-phase AC power supply connected to the three-phase input terminal (1). Or connect one of the two heater parts (R11, R12, R13) for the single-phase AC power supply. Switching unit for switching the Luca (M1, M2, M11, M12,11,111,211) and water heater heater control apparatus characterized by comprising a. In the heater control device for a hot water heater according to claim 1,
The three-phase AC power source is disposed between the three-phase input terminal (1) and the heater connection terminal (2, 3) and closer to the three-phase input terminal (1) than the switching unit (M1, M2, 111). Alternatively, a heater control device for a hot water heater comprising a shut-off device (M3) for shutting off an AC voltage from the single-phase AC power source. In the heater control device for a hot water heater according to claim 1 or 2,
The three-phase AC power supply is detected by detecting an overheating state of the three heater sections (R1, R2, R3) for the three-phase AC power supply or the two heater sections (R11, R12, R13) for the single-phase AC power supply. Is disconnected from the three heater units (R1, R2, R3) for the three-phase AC power source or the two heater units (R11, R12, R13 for the single-phase AC power source and the single-phase AC power source). A heater control device for a hot water heater, comprising safety devices (21, 22, 23) for cutting off the connection with the heater. In the heater control device for a hot water heater according to claim 3,
The safety device (21, 22) includes the three-phase input terminal (1) between the three-phase input terminal (1) and the heater connection terminal (2, 3) and more than the switching unit (M1, M2, 111). 1) A heater control device for a hot water heater, which is arranged on the side. A heater controller for a water heater according to any one of claims 1 to 4,
Two heater parts (R11, R12) for the single-phase AC power source connected to the heater connection terminals (2, 3) of the heater controller for the hot water heater,
A heater device for a water heater, wherein the resistance values of the two heater portions (R11, R12) for the single-phase AC power supply are substantially the same. A heater controller for a water heater according to any one of claims 1 to 4,
Two heater parts (R11, R12, R13) for the single-phase AC power source connected to the heater connection terminals (2, 3) of the heater controller for the hot water heater,
One of the two heater parts (R11, R12, R13) for the single-phase AC power source is connected in parallel with two heaters having substantially the same resistance value as the other heater part (R12). A heater pair (R11, R13),
The switching units (M1, M2, 11) are connected to the heater pair (R11, R13) and the other heater unit (R12) with respect to the single-phase AC power source connected to the three-phase input terminal (1). Are switched in series or only the heater pair (R11, R13) is connected. A heater controller for a water heater according to any one of claims 1 to 4,
Two heater parts (R11, R12, R13) for the single-phase AC power source connected to the heater connection terminals (2, 3) of the heater controller for the hot water heater,
One of the two heater units (R11, R12, R13) for the single-phase AC power source is connected in parallel with two heaters having substantially the same resistance value as the other heater unit (R11). A heater pair (R12, R13),
The switching unit (M1, M2, 11) is connected to the single-phase AC power source connected to the three-phase input terminal (1) with respect to the heater pair (R12, R13) and the other heater unit (R11). Are connected in series or only the other heater part (R11) is switched. A heater controller for a water heater according to any one of claims 1 to 4,
Two heater parts (R11, R12, R13) for the single-phase AC power source connected to the heater connection terminals (2, 3) of the heater controller for the hot water heater,
One of the two heater parts (R11, R12, R13) for the single-phase AC power source is connected in parallel with two heaters having substantially the same resistance value as the other heater part (R13). A heater pair (R11, R12),
The switching unit (M1, M2, 111) is connected to the single-phase AC power source connected to the three-phase input terminal (1) with respect to the heater pair (R11, R12) and the other heater unit (R13). Are connected in series or only one of the heater pairs (R11, R12) is switched. A heater controller for a water heater according to any one of claims 1 to 4,
Three heater parts (R1, R2, R3) for the three-phase AC power source connected to the heater connection terminals (2, 3) of the heater controller for the hot water heater,
The resistance values of the three heater units (R1, R2, R3) for the three-phase AC power source used in the low voltage region where the AC voltage of the three-phase AC power source is at least 230V and the AC voltage of the three-phase AC power source are at least 400V. A heater device for a hot water heater, characterized in that the ratio of the resistance values of the three heater parts (R1, R2, R3) for the three-phase AC power source used in a high voltage area is about 1: 3.

Images