JPH0735920B2 - Control device for hot water storage type electric water heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a controller for a hot water storage type electric water heater that uses late-night power.

(Prior Art) Conventionally, there is known a hot water storage electric water heater configured to count the number of reserved days set by a reservation function by detecting the start of energization of midnight power.
In this hot water storage type electric water heater, the time from the start time of power supply of the midnight power to the time of start power supply of the next night power is calculated as a unit of one day.

(Problems to be Solved by the Invention) However, in the above-described conventional hot water storage type electric water heater,
Midnight power (200V) energizing time (eg P.M11: 00-AM
For example, if there is a power failure at A.M2: 00 at 7:00) and a power failure is restored at A.M3: 00, the number of days set by the reservation function is counted at A.M3: 00 and the second day begins. I will judge that. Therefore, there is a problem that the reservation content is controlled on the day before the reserved day.

(Means for Solving the Problem) The present invention has been made in view of the above circumstances, and a counting means for counting the reservation function and the number of reservation days set by the reservation function by detecting the start of energization of midnight power. In a hot water storage type electric water heater equipped with, a measuring means for measuring a constant time from the start to the end of energization of midnight power, and a backup power source for backing up the measuring means, and measuring the constant time by the measuring means. Is designed not to operate the counting means.

(Operation) The measuring means measures a fixed time from the start to the end of the power supply of the midnight power, and determines the end of the power supply of the night power depending on whether or not the predetermined time has passed. As a result, even if there is a power failure of the midnight power while the midnight power is being supplied, the measuring means is measuring for a certain period of time, so even if the power is restored during this time, the number of reserved days set by the counting means is counted. There is nothing to do.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic block diagram of a control device for a hot water storage type electric water heater according to the present invention.

In the figure, 1 is a hot water storage tank, 2 is a temperature detection unit, 3 is a boiling capacity setting unit, 4 is a reservation function setting unit, 5 is a midnight power input detection unit, 6 is a midnight power conduction time measuring unit, and 7 is a memory. Reference numeral 8 is a boiling control unit, 9 is a power failure detection unit, 10 is a reservation counter, and 11 is an external timer. This control device calculates from the start time of power supply of the midnight power to the start time of power supply of the next night on the next day as a unit of one day. That is, one day is counted by detecting the start of energization of midnight power by the midnight power input detection unit 5.

The temperature detector 2 detects the temperature of hot water in the hot water storage tank 1 via a thermistor (not shown) attached to the hot water storage tank 1, and inputs it to the storage unit 7.

The boiling capacity setting unit 3 is composed of a non-locking type switch. The boiling capacity setting unit 3 performs settings such as setting the boiling temperature to 85 ° C., for example, and inputs the setting data into the storage unit 7.

The reservation function setting unit 4 is composed of a non-locking type switch. The reservation function setting unit 4 performs reservation setting such as boiling the hot water temperature to 85 ° C. after three days, and inputs the reservation data into the storage unit 7.

The midnight power energization time measuring unit 6 is configured to detect the midnight power energization start time detected by the midnight power input detection unit 5 (for example, P.M1
The measurement is started from 1:00), and in this example, the end of energization of midnight power is judged by measuring 8 hours until A.M7: 00 on the next day. The midnight power energization time measuring unit 6 includes a storage unit 7
It is backed up by a backup power supply (not shown) together with the midnight power input detection unit 5, the power failure detection unit 9, and the like.

The boiling control unit 8 reads various data stored in the storage unit 7 to control boiling of the hot water storage tank 1, and
The boiling control by the midnight power is controlled by a control signal input from the external timer 11 via the reservation counter 10. Further, when a power failure is detected by the power failure detection unit 9, this detection data is input to the storage unit 7 via the boiling control unit 8.

The storage unit 7 performs a power outage process based on the detection data from the power outage detection unit 9 and the measurement result from the midnight power energization time measurement unit 6.

This processing will be described with reference to the flowchart of FIG.

That is, when the 200V power failure is detected in the step, it is determined again whether or not the 200V power is supplied in the step.
If there is no energization, it is determined in step whether or not 8 hours have elapsed from the start of 200V energization, and if it has elapsed, normal processing is performed in step, that is, processing for ending the 200V energization time. On the other hand, if 8 hours have not elapsed in step, the process returns to step. And again 200V
If the power is turned on, the 200V power outage process is performed in step. In other words, the number of reserved days set by the reservation function setting unit 4 is not counted, and the processing is performed assuming that 200V is energized on the same day as before the power failure. As a result, the reservation function and other processing can be performed without being affected by the power failure.

(Effects of the Invention) As described above, according to the control device for a hot water storage type electric water heater according to the present invention, even if there is a power outage during the supply of late-night power, the number of reserved days set by the reservation function is incorrect. Since there is no such thing, it is possible to surely execute the reservation content.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a control device for a hot water storage type electric water heater according to the present invention, and FIG. 2 is a flowchart. 1 ... Hot water storage tank, 2 ... Temperature detection unit 3 ... Boiling capacity setting unit, 4 ... Reservation function setting unit 5 ... Midnight power input detection unit, 6 ... Midnight power conduction time measurement unit, 7 ... Storage unit , 8 …… Boiling control section 9 …… Power failure detection section, 10 …… Reservation counter 11 …… External timer

Claims (1)

[Claims] 1. A hot water storage electric water heater having a reservation function and counting means for counting the number of reservation days set by the reservation function by detecting the start of energization of midnight power. Hot water storage characterized in that it comprises a measuring means for measuring a fixed time until the end and a backup power supply for backing up the measuring means, and the counting means is not operated while the fixed time is being measured by the measuring means. Control device for electric water heater.