JPS6329497B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load control device that centrally controls a plurality of loads, such as a heater system.

Conventionally, as this type of load control device, there is one that has been adopted for controlling electric heating, for example. This device is equipped with a heat generating device such as a heater in the heated room, connects this heater to a power source via a thyristor phase control device, and also provides a sensor to detect the indoor temperature in the heated room, and sets the output of this sensor and the preset value. There is a heater which controls the heat generation of the heater by controlling the conduction angle of the thyristor phase control device based on the output compared with the output corresponding to the temperature.

By the way, if such a device is used in a place with a large number of heated rooms, such as a school, the entire device becomes large because it is necessary to prepare the same number of heaters with the above-mentioned configuration as there are heaters for each heated room. It's getting bigger.

However, in the case of the above-mentioned schools, not all of the heated rooms are always used, and they are divided into those that are always used, such as general classrooms, and those that are occasionally used, such as special classrooms. Accordingly, heaters are divided into high-priority heaters that are always used and low-priority heaters that are only occasionally used.

However, even with this type of usage, for example, at the beginning of school, all classrooms may be heated uniformly to a predetermined temperature, and the heaters in all classrooms are turned on at the same time, causing all heaters to stop operating. May be temporarily concentrated.

Therefore, if you take this into consideration and set the power supply capacity according to the installed capacity of the heater, there will be no problem with the power capacity for equipment operation, but it is recommended to set a large power supply capacity for heaters that are not used very often. This is extremely disadvantageous economically as it increases equipment costs and electricity rates.

Therefore, in the past, priority was determined on the load (heater) side as described above, and when an overload occurs and the supplied power exceeds a predetermined level, the stop operation is forcibly executed starting with the load with the lowest priority, and then When the load becomes lighter and the supplied power falls below a predetermined value, a measure is taken in which the power is turned on sequentially starting from the load with the highest priority.

However, when such measures are taken, heating may be stopped continuously in a heated room with a low priority load, i.e., a heater, and the person using the room may feel cold despite the heating equipment. There was an inconvenience that forced me to do so.

This invention was made in order to eliminate the above-mentioned drawbacks, and provides a load control device that can suppress power consumption to a predetermined value, can always expect a stable heating effect, and can also reduce the size and cost of the device. The purpose is to provide

An embodiment of the present invention will be described below with reference to the drawings. By the way, first, the idea of this invention will be briefly explained. If we prioritize the load (heater) as described above and stop it every time the supplied power is exceeded, one load will be stopped continuously, so only the temperature of the room containing this load (heater) will be reduced. decreases significantly.

Therefore, in order to avoid this, the above-mentioned extreme situation can be avoided by lowering the indoor temperature in order of decreasing priority based on predetermined priorities.

Therefore, in this invention, a load with a low priority among all loads, that is, a heater system that is subject to power suppression control, is set in advance for a predetermined channel, and when the total power supply exceeds a predetermined level, that is, a suppression level, this total supply The power supplied to the heater system is sequentially decreased by a predetermined amount of power until the power falls below a predetermined level, thereby lowering the temperature of the corresponding room by a predetermined amount. Of course, in this case, when the total power supply recovers to a predetermined level, the power supply to each channel heater system is restored to its original state by performing the procedure opposite to that described above.

Next, a specific configuration of the present invention will be explained with reference to FIG. In this case, FIG. 1 shows an example in which a plurality of loads, such as a heater system, are subjected to intensive program control over time. In the figure, 1 is a main controller, which includes a memory 2, an operation stop designation circuit 3, a switching circuit 4, a time designation circuit 5, a clock circuit 6, an oscillator 7, a memory control circuit 8, and a write command switch 9. Consisting of
The operation stop data of the operation stop designation circuit 3 and the time data of the time designation circuit 5 are stored in the memory 2 in advance before the turn-on of the write command switch 9, and the above-mentioned time data are stored in the memory 2 in advance by the time output of the clock circuit 6 driven by the oscillator 7. Memory 2 stores the operation stop output corresponding to
The buffer register 10 is configured to read the data and store it in the buffer register 10.

Then, the output of this register 10 is given to the heater power control device 11 corresponding to the above-mentioned heater system, and the heater is programmed to stop operating as time passes. The heater power control device 11 is provided for each room to be heated, and connects a heater 12, which is a heat generating device, to a power supply bus 14 via a control device, for example, a thyristor phase control device 13, and a sensor 15 that detects the indoor temperature. Comparator 17 compares the output of temperature setter 16 with the output of
The heat generation of the heater 12 is controlled by controlling the conduction angle of the thyristor phase control device 13 based on the comparative output of the thyristor phase control device 13. Note that the control device may be a relay or the like in addition to the phase control device.

Here, in the illustrated example, heater power control devices 11 to be subjected to power suppression control are provided for 15 channels, that is, for 11 ₁ to 11 ₁₅ minutes.

Next, a power suppression control device 18 is provided between the power supply bus 14 and the heater power control device 11.

In this case, the power suppression control device 18 is configured as shown in FIG. That is, a transformer, for example, a current transformer 19 is inserted into the power supply bus 14 to which the heater power control device 11 described above is connected, and the current transformer 19
The output end of is connected to analog comparators 21 and 22 via a DC converter 20. The analog comparator 21 is a setting device for setting the above-mentioned suppression level, such as the setting value of the current setting device 23 and the above-mentioned setting value.
Power bus 14 provided via DC converter 20
The output corresponding to the supplied power is compared, and an output is generated when the output corresponding to the supplied power exceeds the suppression level. Further, the analog comparator 22 is connected to the setting value of a setting device, for example, the current setting device 24, which sets the above-mentioned return level.
Power bus 14 provided via DC converter 20
The output corresponding to the supplied power is compared, and an output is generated when the output corresponding to the supplied power falls below the recovery level.

Then, the output terminal of the analog comparator 21 is connected to the up terminal UP of the up/down counter 27 via the differentiating circuit 25 and the OR circuit 26.
The output terminal of the analog comparator 22 is connected to the down terminal DN of the up/down counter 27 via a differentiating circuit 28 and an OR circuit 29. This up-down counter 27 counts up the count every time an input is given to the up terminal UP, and down-counts the count every time an input is given to the down terminal DN.

Further, the output terminals of the analog comparators 21 and 22 are connected to a clock generator 31 via an OR circuit 30. This clock generator 31 generates a pulse output when the output of the comparator 21 or 22 continues for a predetermined period of time.

The output terminal of the clock generator 31 is connected to the up terminal UP of the up-down counter 27 via the AND circuit 32 and the OR circuit 26, and also connects to the up-down terminal UP of the up-down counter 27 via the AND circuit 33 and the OR circuit 29. Connect to down terminal DN of counter 27.

Here, the AND circuit 32 generates an output when an AND condition between the output of the comparator 21 and the output of the clock generator 31 is satisfied,
The AND circuit 33 generates an output when an AND condition between the output of the comparator 22 and the output of the clock generator 31 is satisfied.

The output terminal of the up-down counter 27 is connected to a code converter 34. This code converter 34 has the same number of output terminals t ₁ , t _{2 .} . . t ₁₅ as the heater power control device 11 described above, that is, 15 channels in the illustrated example.
When the count content of 7 is "1", output is generated only to output terminal t ₁ , and when the count content is "2", output is generated to output terminals t ₁ and t ₂ , and the following count content is generated in the same way. Outputs are generated at output terminals t ₁ to _{t 15} according to the output voltage. Here, the code converter 34 specifically includes decoders 35 and 36 that convert the BCD code representing the count contents of the up-down counter 27 into a decimal code, as shown in FIG. Ten
It is composed of gates such as OR circuits 37 ₁ , 37 ₂ . . . 37 ₁₄ that generate outputs of channels 1 to 15 from the base code.

Output buffers 38 ₁ , 38 ₂ . . _. are connected to the output terminals t ₁ , t ₂ .
38 ₁₅ is connected.

Next, returning to FIG. 1, the power suppression control device 1
8 output terminals, that is, the above output buffers 38 ₁ , 38 ₂
...38 ₁₅ the heater power control device 11 ₁ , 1
Connect the relays 39 provided every 1 ₂ ... 11 ₁₅ .
This relay 39 has a normally open contact 391 connected in parallel to the temperature setting device 16 via a resistor 40, and the operation of the relay 39 forcibly lowers the temperature setting by a predetermined amount.

In addition, 4I in FIG. 1 indicates each power control device 11 ₁ , 1
A monitor 42 is a driver for this monitor 41 for monitoring the power supplied to the devices 1 ₂ . . . 11 ₅ .

Next, the operation of the apparatus constructed as above will be described. Now, the heater control devices 11 ₁ , 11 ₂ ,
...11 ₁₅ is assumed to be in operation.

In this state, if another load is applied, the power supply bus 1
4 exceeds the suppression level (in this case, the power of each heater may be increased), that is, when the output of the DC converter 20 corresponding to the supplied power exceeds the setting value of the setting device 23, the comparator 21 generates an output, which is passed through the differentiating circuit 25 to the up terminal UP of the up down counter 27.
is given and counted as 1. Then, due to the count value "1" of the counter 27 at this time, an output is generated only at the output terminal _t1 of the code converter 34.

Therefore, the relay 39 of the heater power control device 11 ₁ operates via the output buffer 38 ₁ and the contact 3
By closing 91, the temperature setting by the temperature setting device 16 is forcibly lowered by a predetermined temperature. As a result, the power supplied to the heater 12 of the heated room corresponding to the heater power control device 11 ₁ is reduced, the room temperature is forcibly lowered, and the total power supplied is suppressed accordingly.

However, this alone may not bring the total power supply below the suppression level. In this case, the output of the analog comparator 21 continues. Therefore, if this state continues for a predetermined period of time, the clock generator 31 generates a pulse output. Then, the up-down counter 27 also counts this pulse output and sets the count content to "2" this time.

As a result, the code converter 34 becomes an output terminal.
Output will be generated at t ₁ and t ₂ . Therefore, the relays 39 of the heater power control devices 11 ₁ , 11 ₂ are operated via the output buffers 38 ₁ , 38 ₂ , and
In the same manner as described above, these heater power control devices 1
The room temperature of the heated rooms corresponding to 1 ₁ and 11 ₂ is forcibly lowered, and the total power supply is further suppressed.

Similarly, if the total power supply does not fall below the suppression level, the comparator 21 continues to output, and the clock generator 31 sequentially generates pulse outputs, which are counted by the counter 27. In the same manner as described above, the room temperature is forced to rise. As the number of heated rooms increases, the supply voltage is suppressed.

Thereafter, when the supplied power becomes less than the suppression level, the output of the comparator 21 is stopped, so that the supplied power is stabilized in a suppressed state according to the count content of the counter 27 at this time.

Next, when another load is tripped from this state and the supplied power becomes below the recovery level, that is, when the output of the DC converter 20 corresponding to the supplied power becomes below the set value of the setting device 24, An output is generated from the comparator 22 and is applied to the down terminal DN of the up/down counter 27 via the differentiating circuit 28. Therefore, the counter 27 counts down the count by 1, so that the count for one system is restored by the procedure opposite to that described above.

Similarly, when the supplied power does not fall below the recovery level, the comparator 22 continues to output, and the clock generator 31 generates a pulse output.
This sequentially decreases the count of the counter 27, so that the operating state of the heater system is restored.

As described above, according to the present invention, when the total power supply exceeds the suppression level, it is possible to reduce the power supply to the heaters in the number of heated rooms corresponding to the overpower level, so the total power supply is always suppressed. Can be controlled below level. This means that the capacity of the power supply equipment can be reduced compared to the conventional system in which the power supply capacity is set according to the total load, and the device can be made smaller and less expensive. In addition, since we are only trying to lower the room temperature in each heated room, priority is given to conventional loads, and the operation of lower priority loads is continuously stopped every time the supplied power is exceeded. You can also expect stable heating effects at all times.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications within the scope without changing the gist.
For example, in the embodiment described above, a resistor 40 was connected in parallel to the temperature setting device 16 via the contact 391 as a means for lowering the set temperature, but as shown in FIG. A subtraction level temperature setter 44 may be connected to this circuit 43 via a contact 391. Moreover, the load is not limited to electric heating equipment, but can also be applied to other loads such as lighting equipment. Further, in the above-described embodiment, a case has been described in which the heater power control device subject to power suppression control has 15 channels, but it is of course possible to use another number of channels. If the number of channels increases significantly, the power suppression control device may include a plurality of up-down counters and code converters arranged in parallel. Furthermore, in the above description, the control target is the one with the lowest priority among the total loads, but the entire load may be the target of control. Furthermore, a plurality of loads (heater system) may be sequentially turned off in one group. Furthermore, although the main control section is program-controlled, it is of course applicable to other systems.

As described above, according to the present invention, it is possible to provide a load control device that can suppress power consumption to a predetermined value, can always expect a stable heating effect, and can be made smaller and less expensive.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a power suppression control device used in the embodiment, and FIG. 3 is a block diagram showing a code converter used in the embodiment. FIG. 4 is a block diagram showing a part of another embodiment of the present invention. 1...Main control device, 2...Memory, 3...Operation stop designation circuit, 4...Switching circuit, 5...Time designation circuit, 6
... Clock circuit, 7... Oscillator, 8... Memory control circuit, 9... Command switch, 10... Buffer register, 11... Heater power control device, 12... Heater, 13... Thyristor phase control device, 14... Bus bar, 15... Sensor , 16... Temperature setting device, 17... Comparator, 18... Power suppression control device, 19... Current transformer,
20...DC converter, 21,22...analog comparator, 23,24...current setter, 25,28...
Differential circuit, 26, 29, 30, 37 ₁ , 37 ₃ ...3
7 ₁₄ ...OR circuit, 27...Up-down counter,
31... Clock generator, 32, 33... AND circuit, 34... Code converter, 35, 36...
Decoder, 38 ₁ , 38 ₂ ...38 ₁₅ ...Output buffer, 39...Relay, 391...Normally open contact, 40...Resistor, 41...Monitor, 42...Monitor driver,
43...Subtraction circuit, 44...Temperature setting device.

Claims (1)

[Claims] 1. A plurality of loads; a main control device that centrally controls the shutdown of these loads; a means for comparing the electric power supplied to the plurality of loads with a predetermined value set in advance; and a power suppression control device having means for sequentially reducing the power supplied to the plurality of loads by a predetermined power for each load based on a comparative output when the supplied power exceeds the predetermined value. load control device. 2. The load control device according to claim 1, wherein the number of loads to which supplied power is reduced is sequentially reduced in accordance with the reduction in the comparison output.