JP2006138529A - Electronic controller for hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of necessary control terminals in a microcomputer of an electronic controller for a hot water supply device. <P>SOLUTION: The electronic controller 100 is provided with a delay circuit 210 outputting a drive signal for starting operation of a bathtub system electric actuator 25 after passage of a certain period when a control signal outputted from the microcomputer 140 is received. When output of the control signal by the microcomputer 140 is stopped, connection between a power circuit 150 and the bathtub system electric actuator 25 is cut off by a power source cutoff circuit 200, and output of the drive signal is stopped by the delay circuit 210. By this, since not only control of the power source cutoff circuit 200, but also control of the delay circuit 210 is carried out by one control signal from the microcomputer 140, only one control terminal outputting the control signal to one electric actuator is used in the microcomputer 140. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic control device for a hot water supply apparatus incorporating a microcomputer for controlling an electric actuator.

  2. Description of the Related Art Conventionally, there is an electronic control device for a hot water supply device that includes a microcomputer that controls various electric actuators of electromagnetic valves and mixing valves, and a power cut-off circuit that cuts off between the electric actuator and the power supply (for example, Patent Documents). 1).

In this case, for example, when it is not necessary to supply power to a predetermined electric actuator, the microcomputer controls the power cut-off circuit to cut off between the electric actuator and the power supply, thereby consuming the hot water supply device in the standby state. The amount of power is being reduced.
Japanese Patent No. 3536702

  By the way, in the above-described electronic control device, the electric actuator and the power cutoff circuit are controlled by a microcomputer, and a drive signal for controlling the drive of the electric actuator and a power control signal for controlling the power cutoff circuit are provided. It is necessary to output from the microcomputer.

  For this reason, in addition to the control terminal that outputs the drive signal to the electric actuator, the microcomputer also needs a control terminal that outputs the power control signal to the power cut-off circuit. Therefore, in order to connect a large number of electric actuators and sensors to the microcomputer, it is necessary to select a microcomputer having a large number of terminals, which causes a problem that the degree of freedom in selecting the microcomputer is reduced.

  Although it is conceivable to simultaneously control the electric actuator and the power cut-off circuit by using one control signal output from the microcomputer, if an electric actuator having a built-in control circuit is used, the electric actuator There is a case where it is necessary to offset the timing for starting the power supply to the actuator and the timing for outputting the drive signal to the electric actuator, and it is impossible to control the electric actuator and the power cutoff circuit with only one control signal. Is possible.

  An object of the present invention is to increase the degree of freedom of selection of a microcomputer in an electronic control unit for a hot water supply apparatus in view of the above points.

In order to achieve the above object, in the invention described in claim 1,
An electronic control device for a hot water supply device applied to a hot water supply device including an electric actuator (24, 25, 26) that operates by being supplied with electric power from a power source (150),
An actuator power shut-off circuit (200) for shutting off or connecting between the power source and the electric actuator; and
A microcomputer (140) for outputting a control signal for connecting between the power source and the electric actuator to the actuator power cut-off circuit;
When receiving a control signal output from the microcomputer, an actuator delay circuit (210) for outputting a drive signal for starting the operation of the electric actuator to the electric actuator after a predetermined period (T2) has elapsed, With
When the output of the control signal is stopped by the microcomputer, the actuator power supply cut-off circuit cuts off the power supply and the electric actuator, and the actuator delay circuit stops the drive signal output. It is characterized by that.

  Therefore, since the actuator delay circuit is employed, it is possible to control not only the actuator power cut-off circuit but also the actuator delay circuit with one control signal output from the microcomputer. Accordingly, it is possible to output and stop the drive signal to the electric actuator in addition to supplying and stopping power to the electric actuator with only one control signal. For this reason, in the microcomputer, only one control terminal that outputs one control signal is used when controlling one electric actuator, so that the number of necessary control terminals is reduced compared to the conventional one, and the selection of the microcomputer is reduced. Will increase the degree of freedom.

  By the way, in the above-mentioned prior art, since the electric actuator and the power cutoff circuit are individually controlled by the microcomputer, the microcomputer can store a control program for controlling the power cutoff circuit in addition to the control program for controlling the electric actuator. It is necessary to secure a memory area. Therefore, it is necessary to select a microcomputer having a wide memory area, and the degree of freedom in selecting a microcomputer is further reduced.

  On the other hand, according to the first aspect of the present invention, the actuator power cut-off circuit and the electric actuator are controlled by one control signal output from the microcomputer. For this reason, the microcomputer only needs to execute a control program for outputting the one control signal, and it is not necessary to secure a larger area than the conventional memory area. The degree of freedom can be expanded.

  In the invention described in claim 2, the hot water supply device is provided with two or more electric actuators (24, 25, 26), and the power-off circuit for the actuator includes the two or more electric actuators. In addition, the power supply is cut off or connected between the power supplies.

  Therefore, it is possible to supply and stop the power by commonly using one actuator power cutoff circuit for two or more electric actuators. Therefore, the circuit configuration can be reduced as compared with the case where the actuator power supply cutoff circuits are individually provided for two or more electric actuators.

  Specifically, as in the third aspect of the present invention, the actuator power cutoff circuit may include an integrating circuit.

According to a fourth aspect of the present invention, the hot water supply device is provided with a sensor (50) that is supplied with electric power from the power source, detects a detection target state, and outputs a detection output to an input terminal of the microcomputer. And
A power-off circuit for a sensor (200) that cuts off or connects between the power source and the sensor, and
When the control signal output from the microcomputer is received, the sensor power supply cutoff circuit connects the power supply and the sensor, and when the output of the control signal by the microcomputer is stopped, the power supply and the sensor It is characterized by blocking between the sensors.

  According to the fourth aspect of the present invention, the sensor power supply cutoff circuit is controlled using the control signal output from the microcomputer to cut off and connect between the power supply and the sensor. Therefore, the microcomputer does not need to output control signals independently to the actuator power shut-off circuit and the sensor power shut-off circuit, and the number of control terminals is not limited when controlling the sensor power shut-off circuit. Will not Increase. Therefore, the degree of freedom in selecting a microcomputer is further increased.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
In this embodiment, the electronic controller for a hot water supply apparatus according to the present invention is applied to a hot water supply apparatus for general households, and FIG. 1 is an overall configuration diagram of the hot water supply apparatus for general households. A schematic configuration of the hot water supply apparatus will be described.

  A general household hot water supply apparatus is roughly divided into a heat pump unit 10 and a hot water storage tank unit 20. The heat pump unit 10 includes a known heat exchanger that generates high-temperature hot water. The hot water storage tank unit 20 has a vertically long hot water storage tank 21, and the high-temperature hot water heated by the heat pump unit 10 passes through the hot water pipe 80. It flows into the hot water storage tank 21 from the hot water supply port at the top of 21. And hot water flows in into the heat exchanger of the heat pump unit 10 through the hot water piping 81 from the exit of the bottom part of the hot water storage tank 21 by the electric pump which is not illustrated.

  Here, a water supply inlet 82 for supplying tap water or the like is provided at the bottom of the hot water storage tank 21. A water supply pipe 84 is branched from the middle of the water supply pipe 83 connected to the water supply inlet 82. The water supply pipe 84 is branched into water supply pipes 84 a and 84 b and connected to the mixing valves 22 and 23. Here, the hot water storage tank 21 is provided with a plurality of thermistors (temperature sensors) 30a to 30g for detecting the temperature of the hot water therein at different heights in the tank vertical direction.

  A three-way valve 21 is connected in series to the hot water pipe 81 connected to the outlet of the hot water storage tank 21, and the three-way valve 21 connects between the hot water pipes 81 and 80.

  On the other hand, the mixing valve 22 joins the water supply pipe 84a and the hot water supply pipe 85a through which hot water flows from the hot water supply port at the top of the hot water storage tank 21, and the hot water mixed by the mixing valve 22 is supplied with the hot water supply pipe. It flows through a hot water outlet 71 such as a shower and a washroom through 87.

  Here, the mixing valve 22 adjusts the temperature of hot water discharged from the hot water outlet 71 to the hot water outlet 71 by adjusting the mixing ratio of the tap water flowing in the hot water supply pipe 84a and the high temperature hot water flowing in the hot water supply pipe 85a. Will do. The hot water supply pipe 87 is provided with a thermistor 31 and a flow rate counter 50 for detecting the temperature of hot water flowing through the pipe and the flow rate of hot water.

  On the other hand, the mixing valve 23 joins the water supply pipe 84b and the hot water supply pipe 85b through which high-temperature hot water flows from the hot water supply port at the top of the hot water storage tank 21, and the hot water mixed in the mixing valve 23 is indicated by the arrow Y1. As described above, the hot water is discharged into the bathtub 74 through the hot water supply pipe 86 and the three-way valve 24.

  The mixing valve 23 adjusts the temperature of the hot water discharged into the bathtub 74 by adjusting the mixing ratio of the tap water flowing in the water supply pipe 84b and the high temperature hot water flowing in the hot water supply pipe 85b.

  Here, an electromagnetic valve 25, a flow counter 51, check valves 72 and 73, and a flow switch 60 are arranged in series in the hot water supply pipe 86, and the electromagnetic valve 25 is provided between the mixing valve 23 and the bathtub 74. The flow switch 60 is a sensor that detects the flow of hot water in the hot water supply pipe 86 by opening and closing the switch. A thermistor 32 that detects the temperature of hot water discharged from the hot water supply pipe 86 into the bathtub 74 is provided.

  Further, when the hot water in the bathtub 74 is kept warm, the three-way valve 24 is switched to form a closed circuit through which the hot water flows as indicated by the arrow Y2, and this closed circuit causes the bath 74 and the bath heat exchanger 70 to exchange heat. Hot water is circulated by the circulation pump 61.

  Here, the bath thermal insulation heat exchanger 70 is disposed in the hot water storage tank 21, and exchanges heat between the high temperature hot water in the hot water storage tank 21 and the hot water flowing in the hot heat exchanger 70. Heat the warm water.

  The motor-operated valve 26 is arranged in series in the closed circuit, and the motor-operated valve 26 is a valve that opens and closes between the bathtub 74 and the circulation pump 61. In addition, the code | symbol 71 in FIG. 1 is a thermostat for tank protection, and the code | symbol 71 is a water stop cock.

  Next, the electrical circuit configuration of the hot water supply apparatus of the present embodiment will be described with reference to FIG.

  That is, the hot water supply apparatus of the present embodiment includes the electronic control device 100 shown in FIG. 2, and the electronic control device 100 includes an input circuit 110, an output circuit 120, a communication circuit 130, a microcomputer 140, and a power supply circuit 150. I have.

  The input circuit 110 includes an integration circuit which will be described later. The integration circuit performs signal processing such as waveform shaping on the detection signals output from the thermistors 30a to 30g and 31 to 34 and outputs the result to the microcomputer 140. .

  The detection signals of the thermistors 30a to 30g determine the gradient of the hot water temperature in the tank vertical direction, and based on the gradient, whether or not there is a required amount of high-temperature hot water at a predetermined temperature (for example, 60 ° C.) or higher in the upper part of the hot water storage tank 21. That is, it can be determined whether or not there is a hot water condition. When the hot water storage tank 21 does not have a required amount of high-temperature hot water of a predetermined temperature (for example, 60 ° C.) or more, it is determined that the hot water has run out, and the heating operation of the heat pump unit 10 is started to prevent the hot water from running out. It comes to prevent.

The input circuit 110 is provided with an integration circuit corresponding to each of the flow rate counters 50 and 51, and each integration circuit responds to a detection signal indicating the hot water flow rate detected by the flow rate counters 50 and 51. The signal processing such as waveform shaping is then performed and output to the microcomputer 140.
Further, the input circuit 110 is provided with an integration circuit corresponding to each of the water level sensor 40 and the flow switch 60, and each integration circuit corresponds to a detection signal output from the water level sensor 40 and the flow switch 60. Signal processing such as waveform shaping is performed and output to the microcomputer 140.

  Further, the input circuit 110 is provided with a power cutoff circuit that cuts off and connects between the flow rate counter 51 and the power supply circuit 150. The power supply cutoff circuit supplies power from the power supply circuit 150 to the flow rate counter 51 and Make that stop.

  On the other hand, the output circuit 120 supplies electric power supplied from the power supply circuit 150 to each of the electric actuators such as the circulation pump 61, the electromagnetic valve 25, the electric valve 26, the three-way valves 21, 24, the mixing valves 22, 23, and the like. The control signal from the microcomputer 140 is output to each electric actuator.

  In particular, a power shut-off circuit is provided for each of the electromagnetic valve 25, the motor-operated valve 26, and the three-way valve 24. Each power shut-off circuit is based on a control signal output from the microcomputer 140. (For example, circulation pump 61) and power supply circuit 150 are disconnected and connected. Further, the output circuit 120 is provided with a delay circuit corresponding to the electromagnetic valve 25, the motor-operated valve 26, and the three-way valve 24. The delay circuit receives a control signal from the microcomputer 140, and after a certain period of time has elapsed. And outputs a drive signal for starting the operation of the electric actuator.

  Here, the reason why the power cut-off circuit is individually adopted corresponding to the electromagnetic valve 25, the electric valve 26, and the three-way valve 24 will be explained. The three bath electric actuators such as the electromagnetic valve 25, the electric valve 26, and the three-way valve 24 are as follows. It operates in a bath mode in which hot water is discharged into the bathtub 74 or hot water in the bathtub 74 is kept warm.

  For this reason, it is not necessary to supply electric power to the solenoid valve 25, the motor-operated valve 26, and the three-way valve 24, except when taking out hot water in the bathtub 74 or in a bath mode for keeping warm water in the bathtub 74. Therefore, in order to stop the power supply to the electromagnetic valve 25, the electric valve 26, and the three-way valve 24 except during the bath mode, a power cut-off circuit is adopted for each bath electric actuator.

  The communication circuit 130 communicates between the kitchen remote controller R1, the bathroom remote controller R2, and the microcomputer 140.

  The microcomputer 140 includes a circulation pump 61, a remote controller R2, a bathroom remote controller R2, thermistors 30a to 30g, 31 to 34, flow counters 50 and 51, water level sensor 40, and flow switch 60 based on the individual detection signals. Electric actuators such as the electromagnetic valve 25, the three-way valves 21 and 24, and the mixing valves 22 and 23 are controlled. Furthermore, the power supply circuit 150 generates DC 12V and 5V based on the AC power supply voltage supplied from the commercial power supply.

  Next, the output circuit 120 will be described with reference to FIGS.

  First, the details of the circuit configuration of the output circuit 120 will be described with reference to FIG. 3 taking the power cutoff circuit 200 and the delay circuit 210 provided corresponding to the electromagnetic valve 25 as an example. FIG. 3 is an electronic circuit diagram showing a circuit configuration of the power cutoff circuit 200 and the delay circuit 210.

  The power shut-off circuit 200 inverts the logic of the control signal (pulse signal) output from the control terminal of the microcomputer 140 and outputs an inverted signal, and the inverter circuit 201 inputs through the resistance elements 202 and 203. Switching between the output terminal (5V) of the power supply circuit 150 and the power supply terminal (+) of the electromagnetic valve 25 by switching based on the inverted signal, and the common connection of the resistance elements 202 and 203 And a capacitor 205 connected between the terminal and the ground.

  Specifically, the microcomputer 140 outputs a high level signal as a control signal from the control terminal. That is, as shown in FIG. 4A, when the output voltage of the control terminal changes from the low level to the high level, the output signal of the output terminal of the inverter 201 also changes from the high level to the low level. For this reason, the electric charge stored in the capacitor 205 flows toward the output terminal of the inverter 201 through the resistance element 202. Accordingly, as shown in FIG. 4B, the voltage at the base terminal of the transistor 204 (hereinafter referred to as base voltage) also gradually decreases from the high level.

  Therefore, when the time T1 elapses after the base voltage starts to decrease, the voltage value becomes less than a certain voltage value, and the transistor 204 transitions from the off state to the on state. That is, the transistor 204 connects between the output terminal (5V) of the power supply circuit 150 and the power supply terminal (+) of the electromagnetic valve 25 in order to connect the emitter and the collector. Accordingly, as shown in FIG. 4C, energization from the power supply circuit 150 to the electromagnetic valve 25 is started.

  Further, since the control signal (that is, the high level signal) output from the microcomputer 140 is also input to the delay circuit 210, and the capacitor 212 stores electric charges based on the control signal, FIG. As shown, the voltage at the positive terminal of the capacitor 212 gradually increases. Therefore, when the time T2 elapses after the control signal is input, the voltage at the positive terminal exceeds a certain voltage value, and the output voltage of the inverter 213 starts to output a low level signal as a drive signal to the control terminal of the solenoid valve 25. To do. For this reason, as shown in FIG.4 (e), the solenoid valve 25 will change to a drive state from a non-drive state.

  When the control signal is output and the time T0 has elapsed, the microcomputer 140 stops outputting the control signal. In other words, as shown in FIG. 4A, the output signal output from the control terminal of the microcomputer 140 is switched from the high level signal to the low level signal. Along with this, the output signal of the inverter 201 also changes from the low level to the high level. For this reason, a current flows from the inverter 201 to the capacitor 205 through the resistance element 202 and charges are stored.

  Accordingly, as shown in FIG. 4B, when the base voltage of the transistor 204 also rises and the time T5 elapses, the voltage value becomes equal to or higher than a certain voltage value, and the transistor 204 changes from the on state to the off state. Transition to. That is, the transistor 204 cuts off between the output terminal (5V) of the power supply circuit 150 and the power supply terminal (+) of the electromagnetic valve 25 in order to cut off between the emitter and the collector. Along with this, as shown in FIG. 4C, energization from the power supply circuit 150 to the electromagnetic valve 25 is stopped (power supply is cut off).

  Further, when the output of the control signal from the microcomputer 140 (that is, the high level signal) is stopped, the voltage of the control terminal of the microcomputer 140 changes to the low level, as shown in FIG. The voltage at the positive terminal of the capacitor 212 gradually decreases. For this reason, when the time T6 elapses from the stop of the output of the control signal, the voltage of the positive terminal becomes less than a certain voltage value, and the output voltage of the inverter 213 starts to output a high level signal to the control terminal of the electromagnetic valve 25. For this reason, as shown in FIG.4 (e), the solenoid valve 25 will change from a drive state to a non-drive state.

  Next, the effect of this embodiment is demonstrated. That is, in the present embodiment, the electronic control device 100 is applied to a hot water supply device including bath-type electric actuators 24, 25, and 26 such as solenoid valves that are operated by being supplied with power from the power circuit 150. A power cut-off circuit 200 that cuts off or connects between the bath electric actuators 24, 25, and 26, and a control signal for connecting the power circuit 150 and the bath electric actuators 24, 25, and 26. When the microcomputer 140 output to the power shutoff circuit 200 and the control signal output from the microcomputer 140 are received, the operation of the bath-type electric actuators 24, 25, and 26 is started after a certain period (T2) has elapsed. The delay circuit 2 that outputs the drive signal of 1 to the bath electric actuators 24, 25, 26 And a 0, a.

  When the microcomputer 140 stops outputting the control signal, the power cutoff circuit 200 shuts off the power supply circuit 150 and the bath electric actuators 24, 25, and 26, and the delay circuit 210 outputs the drive signal. It is characterized by being stopped.

  Therefore, one control signal output from the microcomputer 140 can control not only the power cutoff circuit 200 but also the delay circuit 210. Along with this, in addition to supplying and stopping power to the bath-type electric actuators 24, 25, and 26, only one control signal outputs and stops driving signals to the bath-type electric actuators 24, 25, and 26. be able to. Therefore, since only one control terminal that outputs a control signal is used for one electric actuator in the microcomputer 140, the number of necessary control terminals is reduced as compared with the conventional one. The freedom of choice will increase.

  By the way, in the above-mentioned prior art, since the electric actuator and the power cutoff circuit are individually controlled by the microcomputer, the microcomputer can store a control program for controlling the power cutoff circuit in addition to the control program for controlling the electric actuator. It is necessary to secure a memory area. Therefore, it is necessary to select a microcomputer having a wide memory area, and the degree of freedom of selection of the microcomputer is narrowed.

  On the other hand, according to the present embodiment, the power cutoff circuit 200 and the bath electric actuators 24, 25, and 26 are controlled by one control signal output from the microcomputer 140. For this reason, the microcomputer 140 only needs to execute a control program for outputting the one control signal, and it is not necessary to secure a larger area than the conventional memory area. The degree of freedom of selection can be expanded.

(Second Embodiment)
In the above-described first embodiment, the example in which the power shut-off circuit 200 is individually adopted for the bath electric actuator 24 (25, 26) has been described. However, the present invention is not limited to this, and for example, two or more bath systems A single power cut-off circuit 200 may be commonly used for the electric actuator. A circuit configuration in this case is shown in FIG.

  In FIG. 5, one power supply cutoff circuit 200 is provided for the two bath electric actuators 25 and 26, and the bath electric actuators 25 and 26 are connected to the collector terminal of the transistor 204 of the power supply cutoff circuit 200. Power supply terminals (+) are connected to each other. For this reason, the power shutoff circuit 200 can supply power from the power circuit 150 to the bath electric actuators 25 and 26 and stop the power based on the control signal from the microcomputer 140.

  Further, the microcomputer 140 outputs control signals independently to the control terminals of the bath electric actuators 25 and 26, respectively. Here, a control signal is sent to the control terminal of the bath electric actuator 26 via the inverter 213a.

  Next, the function and effect of the second embodiment will be described. That is, in the electronic control device 100 of the second embodiment, one power shut-off circuit 200 is provided for the two bath-type electric actuators 25 and 26, and one power shut-off circuit 200 is used in common. The power supply from 150 to the two bath electric actuators 25 and 26 can be stopped and stopped. Therefore, the circuit configuration can be reduced as compared with the case where the power shut-off circuit 200 is individually provided for the two bath electric actuators 25 and 26.

  In the second embodiment described above, an example has been described in which one power shut-off circuit 200 is commonly used to supply power from the power circuit 150 to the two bath-type electric actuators 25 and 26 and stop the power. However, the present invention is not limited to this, and the power supply circuit 150 may be commonly used to supply power to the three or more bath-type electric actuators and stop the power supply circuit 150.

(Third embodiment)
In the second embodiment described above, the capacitor 205 is employed in the power cut-off circuit 200, and the transistor 204 is turned on after a certain period of time has elapsed after receiving a control signal from the microcomputer 140, and the microcomputer 140 outputs the control signal. The example in which the delay circuit is configured so that the transistor 204 is turned off after a certain period of time has elapsed after the stop has been described. However, the present invention is not limited to this, and as illustrated in FIG. May be.

  In the circuit configuration shown in FIG. 6, the delay circuit 210 that outputs a drive signal to the control terminal of the bath electric actuator 25 is not connected to the control terminal of the microcomputer 140 as shown in FIG. It is connected to the collector terminal of the transistor 204 of the cutoff circuit 200.

(Fourth embodiment)
In the first embodiment described above, the example in which the power cutoff circuit 200 provided corresponding to the electromagnetic valve 25 is configured to be controlled based on the control signal from the microcomputer 140 has been described. The circuit configuration may be as shown in FIG.

  That is, in the circuit configuration shown in FIG. 7, the power cutoff circuit 200 a is provided corresponding to the flow rate counter 51, and the power cutoff circuit 200 is provided corresponding to the bath electric actuator 25. The power cutoff circuit 200a operates based on the potential of the positive terminal of the capacitor 205 of the power cutoff circuit 200.

  Specifically, the power cutoff circuit 200a includes a PNP transistor 204a connected to a base terminal via a backflow prevention diode D1 and a resistance element 203a, and the collector terminal of the PNP transistor 204a is connected to the flow counter 50. The emitter terminal is connected to the power supply terminal (5V) of the power supply circuit 150.

  Therefore, the microcomputer 140 outputs a control signal to the inverter circuit 201, and the inverter circuit 201 outputs a low level signal. Along with this, when the potential of the positive terminal of the capacitor 205 decreases, a current flows from the power supply terminal (12V) of the power supply circuit 150 between the emitter terminal and the base terminal of the transistor 204a, and the resistance element 203a and the backflow prevention diode D1. Through the capacitor 205. Thereafter, the transistor 204a is turned on to connect the power supply circuit 150 and the flow rate counter 51, so that power is supplied from the power supply circuit 150 to the flow rate counter 51.

  That is, the transistor 204a connects between the power shut-off circuit 200a and the flow rate counter 51 based on a control signal from the microcomputer 140.

  On the other hand, when the microcomputer 140 stops outputting the control signal, that is, when a low level signal is output to the inverter circuit 201, the inverter circuit 201 outputs a high level signal. Accordingly, when the potential of the positive terminal of the capacitor 205 rises, no current flows from the transistor 204a base terminal side to the capacitor 205 side. Therefore, since the transistor 204a is turned off and the power supply circuit 150 and the flow rate counter 51 are disconnected, power supply from the power supply circuit 150 to the flow rate counter 51 is stopped.

That is, the transistor 204a blocks between the power supply circuit 150 and the flow rate counter 51 based on the stop of the output of the control signal by the microcomputer 140.
According to the present embodiment, the transistor 204a of the power cutoff circuit 200a connects and disconnects between the power supply circuit 150 and the flow rate counter 51 in accordance with a control signal from the microcomputer 140. Therefore, the microcomputer 140 does not need to output control signals independently to the power cutoff circuits 200 and 200a, and it is not necessary to increase the number of control terminals when controlling the power cutoff circuit 20a. Therefore, the degree of freedom of selection of the microcomputer 140 is further increased.

(Other embodiments)
In each of the above-described embodiments, the example in which the PNP transistor is used as the transistor 204a of the power cutoff circuit 200, 200a has been described. However, the present invention is not limited to this, and various semiconductor switches and mechanical relays such as a field effect transistor are employed. May be.

  In the above-described embodiment, an example in which a general household hot water supply device is applied as the hot water supply device according to the present invention has been described. However, the present invention is not limited thereto, and a commercial hot water supply device may be applied as the hot water supply device according to the present invention. .

  Hereinafter, the correspondence relationship between the embodiment and the configuration of the scope of the claims will be described. The power supply circuit 150 corresponds to the power supply according to claim 1, and the cutoff circuit 200 configured in the output circuit 120 is claimed. The delay circuit 210 configured in the output circuit 120 corresponds to the actuator power cut-off circuit according to claim 1, the delay circuit 210 configured in the output circuit 120 corresponds to the actuator delay circuit according to claim 1, and the bath electric actuators 25 and 26 are claimed. 2 corresponds to the two electric actuators, and the flow rate counter 51 corresponds to “a sensor that detects a detection target state and outputs a detection output to an input terminal of the microcomputer”.

It is a schematic diagram which shows schematic structure of the hot water supply apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows the electric circuit structure of the hot water supply apparatus of FIG. FIG. 3 is an electric circuit diagram showing in detail the circuit configuration of a part of the electronic control device of FIG. 2. It is a timing chart for demonstrating the action | operation of the electric circuit diagram of FIG. It is an electric circuit diagram which shows the partial circuit structure of the electronic controller for hot water supply apparatuses which concerns on 2nd Embodiment of this invention. It is an electric circuit diagram which shows the partial circuit structure of the electronic controller for hot water supply apparatuses which concerns on 3rd Embodiment of this invention. It is an electric circuit diagram which shows the partial circuit structure of the electronic controller for hot water supply apparatuses which concerns on 4th Embodiment of this invention.

Explanation of symbols

24-26 ... Bath electric actuator,
100: Electronic controller for hot water supply device, 140: Microcomputer,
200: power shutoff circuit, 210: delay circuit.

Claims (4)

An electronic control device for a hot water supply device applied to a hot water supply device including an electric actuator (24, 25, 26) that operates by being supplied with electric power from a power source (150),
An actuator power shut-off circuit (200) for shutting off or connecting between the power source and the electric actuator; and
A microcomputer (140) for outputting a control signal for connecting between the power source and the electric actuator to the actuator power cut-off circuit;
When receiving a control signal output from the microcomputer, an actuator delay circuit (210) for outputting a drive signal for starting the operation of the electric actuator to the electric actuator after a predetermined period (T2) has elapsed, With
When the output of the control signal is stopped by the microcomputer, the actuator power supply cut-off circuit cuts off the power supply and the electric actuator, and the actuator delay circuit stops the drive signal output. An electronic control device for a hot water supply device, characterized in that: The hot water supply device is provided with two or more electric actuators (24, 25, 26),
2. The electronic control device for a hot water supply apparatus according to claim 1, wherein the power supply cutoff circuit for the actuator performs one of cutoff and connection between the two or more electric actuators and the power supply. . The electronic control device for a hot water supply apparatus according to claim 1 or 2, wherein the actuator power supply cutoff circuit includes an integration circuit. The hot water supply device is provided with a sensor (50) that is supplied with power from the power source, detects a detection target state, and outputs a detection output to an input terminal of the microcomputer,
A power-off circuit for a sensor (200) that cuts off or connects between the power source and the sensor, and
When the control signal output from the microcomputer is received, the sensor power supply cutoff circuit connects the power supply and the sensor, and when the output of the control signal by the microcomputer is stopped, the power supply and the sensor The electronic control device for a hot water supply device according to any one of claims 1 to 3, wherein a gap between the sensors is cut off.

Images