JP4137632B2 - Demand control system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a demand control system that controls a load so that demand power falls within a predetermined range.
[0002]
[Prior art]
In recent years, in order to suppress the peak of power consumption, electricity tariff contracts between power supply companies and large consumers of power, such as factories, high-rise commercial buildings, hotels, hospitals, etc., are based on demand power. The basic usage fee is determined. The demand power is the power consumption measured during the demand power measurement period (currently 30 minutes), and the power consumption of the maximum power consumption among the power consumption during each demand power measurement period throughout the demand period (currently one year). The basic usage fee for one year's electricity charge is determined based on this demand power (maximum power consumption during the demand power measurement period). For this reason, large consumers are trying to reduce demand for electricity by reducing demand.
[0003]
In general, power consumption reaches a peak in summer and power consumption in winter is about half that in summer. This is because an air conditioner (air conditioner, air conditioner, etc.) is used in the summer, and the power consumption becomes very large due to the operation of the air conditioner, thereby increasing the demand power. On the other hand, even if the air conditioner is temporarily stopped, the environmental temperature will rise slightly, and there will be no adverse effects on the production activities of the factory and the commercial activities of the commercial buildings. Can be reduced, and thereby, the electricity charge can be reduced.
[0004]
For this reason, a demand power monitoring device for monitoring the demand power so as to be within the target demand power has been proposed and put into practical use. This type of demand power monitoring apparatus is provided attached to a power meter that measures power consumption, and a pulse converter is disposed between the power meter and the demand power monitoring apparatus. The power meter generates a measurement pulse signal corresponding to the power consumption, and the measurement pulse signal is converted into a monitoring pulse signal by the pulse converter, and the demand power monitoring device uses this monitoring pulse signal to Monitor power.
[0005]
[Problems to be solved by the invention]
In the above-described conventional system, a pulse converter is interposed between the power meter and the demand power monitoring device. The pulse converter converts a measurement pulse signal from the power meter into a monitoring pulse signal, and a demand signal. The signal from the power monitoring device is prevented from flowing to the power meter side. A pulse converter having these functions is expensive, and there is a problem that the installation cost is high when it is attempted to install a demand power monitoring device in order to suppress demand power.
[0006]
The objective of this invention is providing the demand control system which can utilize the blink display produced | generated according to power consumption with an electric power meter as a monitoring pulse signal of a demand power monitoring apparatus.
[0007]
Another object of the present invention is to provide a demand control system capable of controlling the operation of the adjustment load so as to achieve the target demand power without giving a large load to the adjustment load.
[0008]
[Means for Solving the Problems]
The present invention includes a power meter that measures power supplied to a load, and a demand power monitoring device that monitors demand power consumed by a fixed load and a regulated load, the demand power monitoring device comprising: In the demand control system that forcibly stops the adjustment load when the power consumption during the measurement period is likely to exceed the target demand power,
The power meter is flashing with a power status display means varying blinking state in accordance with the consumption state of the power, in relation to the power consumption state display means, for detecting a blinking state of the power status display means State detection means is provided, and the demand power monitoring device further includes demand power calculation means for calculating demand power based on a blink detection signal from the blink state detection means, and partial measurement in which the demand power measurement period is divided. Power comparison means for comparing partial demand power of a period with partial target demand power corresponding to the partial measurement period, operation control means for operating control of the adjustment load, and emergency for emergency stop of the adjustment load Stop means, and forced operation prohibiting means for prohibiting the operation of the adjustment load continuously during the partial measurement period when the emergency stop is performed by the emergency stop means , It includes a,
The demand power calculation means is configured to calculate demand power using a blinking state of the power consumption state display means, and the demand power of the demand power measurement period and a partial measurement period obtained by dividing the demand power measurement period When the partial demand power in the partial measurement period exceeds the partial target demand power corresponding to the partial measurement period, the operation control means continuously stops the adjustment load for a predetermined time. Further, the demand power calculating means calculates the fine partial demand power of the fine portion measurement period further subdivided for the final partial measurement period of the partial measurement periods, and the power comparing means The sub-partial demand power in the measurement period is compared with the sub-part target power demand corresponding to the sub-part measurement period, and the sub-part measurement period When the sub-part demand power exceeds a sub-part target power demand corresponding to the sub-part measurement period, the emergency stop means stops the adjustment load, and the forced operation prohibition means stops the adjustment load operation. The partial measurement period is prohibited continuously .
[0009]
According to the present invention, the power meter includes the power consumption state display means, the blinking state detection means detects the display state of the power consumption state display means, and the demand power calculation means of the demand power monitoring device detects the blinking state. The demand power is calculated using the blinking detection signal from the detection means. Thus, instead of using the pulse signal generated by the power meter, the blinking display state of the power consumption state display means for visually confirming the power usage state is detected. The demand power can be calculated by simply and easily detecting the power consumption state in the disconnected state. Therefore, it is possible to provide an inexpensive system without requiring an expensive pulse converter. The demand power calculation means is a demand power measurement period (for example, 30 minutes) demand power and a partial measurement period (a measurement period obtained by dividing the demand power measurement period, and one partial measurement period is about 1 to 5 minutes. The partial power demand of the partial measurement period is calculated, and the partial demand power of the partial measurement period is compared with the partial target demand power corresponding to the partial measurement period. Then, when the partial demand power in the partial measurement period exceeds the partial target demand power corresponding to the partial measurement period, the operation control means stops the operation of the adjustment load (for example, the air conditioner) so that the power becomes the target demand power. Reduce consumption. Since the power comparison by the power comparison means is performed in comparison with the partial target demand power throughout the demand power measurement period, the power consumption is also adjusted throughout the demand power measurement period, and the adjustment load is activated during the latter half of the measurement period. The stop does not concentrate. In addition, when the adjustment load is deactivated, the deactivation continues for a predetermined time (for example, a partial measurement period, for example, 2 minutes), so that adverse effects on the adjustment load due to short-time operation and deactivation are avoided. can do. For example, if an air conditioner is included as an adjustment load, repeated operation and stoppage in a short time will cause a large load to act on the compressor of the air conditioner and cause a failure, but such a problem may occur. Nor. In addition, for the final partial measurement period of the partial measurement periods, the fine partial demand power of the fine partial measurement period (about 10 to 30 seconds, for example, set to 20 seconds) is calculated. The fine partial demand power is compared with the fine partial target demand power corresponding to the fine measurement period. When the fine part demand power in the fine part measurement period exceeds the fine part target demand power corresponding to this fine part measurement period, the emergency stop means stops the adjustment load, so the demand power in the demand power measurement period is the target power. Exceeding demand power can be avoided more. In addition, when the adjustment load is urgently stopped during this final partial measurement period, the forced operation prohibiting means continuously prohibits the adjustment load from operating during the partial measurement period, so there is also an adverse effect on the adjustment load due to short-time operation and operation stoppage. It can be avoided.
[0014]
Further, in the present invention, the power consumption state display means is constituted by a liquid crystal display device, the blinking state detection means is a light emitting element that irradiates light toward the liquid crystal display device, and reflected light from the liquid crystal display device. The light receiving signal of the light receiving element is sent to the demand power monitoring device as the blinking detection signal.
[0015]
According to the present invention, since the blinking state detecting means is composed of a combination of a light emitting element and a light receiving element, the blinking state of the liquid crystal display device of the power meter can be accurately detected with a relatively simple configuration. Thus, demand power can be accurately monitored.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a demand control system according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram schematically illustrating an embodiment of a demand control system according to the present invention, FIG. 2 is a block diagram schematically illustrating a main part of the demand control system of FIG. 1, and FIG. FIG. 4 is a flowchart showing control by the demand control system of FIG. 1, and FIG. 4 is a diagram for explaining monitoring of demand power by the flowchart of FIG.
[0017]
1 and 2, the illustrated demand control system includes a composite power meter 2 as a power meter and a demand power monitoring device 4 that monitors demand power. The composite power meter 2 measures the power consumption of various loads 6 and the demand power of these loads 6. The various loads 6 are classified into an adjustment load 8 that is controlled by the demand power monitoring device 4 and a fixed load 10 that is not controlled by the demand power monitoring device 4. The adjustment load 8 corresponds to a device that does not cause a problem even if the operation is stopped depending on the state of demand power. In this embodiment, the first load air conditioner 12, the second air conditioner 14, and the like are included. Further, the fixed load 10, corresponds the device the problem occurs when it stops working on the state of the demand power, the illumination device 16 in this embodiment shaped condition, various devices 18 (for example, in the case of plants, various production equipment such as Is included). The adjustment load 8 and the fixed load 10 are appropriately set by the business operator who installs the demand power monitoring device 4 according to the circumstances of the business office.
[0019]
The illustrated composite power meter 2 includes a box-shaped device housing 20, and three liquid crystal display devices, that is, first, second, and third liquid crystal display devices 22, 24, and 26 are provided on the front surface thereof. The first liquid crystal display device 22 functions as a power consumption state display means, and blinks according to the power consumption state consumed by the adjustment load 8 and the fixed load 10. When the power consumption is large, the blinking interval is shortened, and the power consumption When is small, the blinking interval becomes long. The first liquid crystal display device 22 may be provided with a display unit indicating an unmetered state and / or a display unit indicating a power failure state. The second liquid crystal display device 24 displays the demand power, and the third liquid crystal display device 26 displays the power consumption in an integrated manner. The composite power meter 2 is further provided with an operation lamp 28 for indicating that the power is being measured.
[0020]
Next, the illustrated demand power monitoring device 4 will be described. The demand power monitoring device 4 includes a controller 30, an input unit 32, and an alarm unit 34 for monitoring the demand power and controlling the adjustment load 8. Yes. The controller 30 is composed of, for example, a microprocessor, and includes an average power calculation means 36, a demand power calculation means 38, a power comparison means 40, and an operation control means 42. The average power calculation means 36 calculates the partial target demand power based on the set target demand power. In this embodiment, the demand power measurement period (currently set to 30 minutes) is divided into 15, and each partial measurement period is set to an interval of 2 minutes, for example. In such a case, if the target demand power is set to P _0, as shown in FIG. 4, the average power calculation unit 36, the partial target demand power P1 of the first part measuring periods, P1 = P _0/15 And the partial target demand power P2 of the second partial measurement period is calculated as P2 = (2 × P ₀ ) / 15, and the third partial measurement period (fourth...) the partial target demand power P3 (P4 ···), P3 = (3 × P 0/15) _{[P4 = 4 × P 0/15} ) ··· ] and computing. This demand power measurement period can be divided into an appropriate number.
[0021]
The demand power calculation means 38 calculates the demand power during the demand measurement period as described later, and calculates the partial demand power during each partial measurement period. The power comparison means 40 compares the partial demand power in the partial measurement period with the partial target demand power corresponding to the partial measurement period. As understood from FIG. 4, the power comparing means 40 corresponds to the partial demand power of the first partial measurement period and the first partial measurement period when the first partial measurement period has elapsed. subgoal demand power P1 (P1 = P 0/15 ) and to compare, during the elapsed second th partial measuring period, part demand power and the second part measurement period up to the second part measurement period Is compared with the partial target demand power P2 [P2 = (2 × P0) / 15], and when the third (fourth ...) partial measurement period has elapsed, the third (fourth) ...) And the third (fourth...) Partial target demand power P3 (P4...) Are compared.
[0022]
The operation control means 42 controls the adjustment load 8 as will be described later. In this embodiment, the operation control means 42 performs the operation control of the adjustment load 8 for each partial measurement period, and when the adjustment load 8 operates, the operation state is continuously maintained for this partial measurement period (for example, 2 minutes), When the operation of the adjustment load 8 stops, the stopped state is continuously maintained throughout the partial measurement period. Thus, by performing the operation and the operation stop for each partial measurement period, it is avoided that the operation is repeatedly performed and stopped in a short time, and a large load acts on the first and second air conditioners 12 and 14 and the like. Can be avoided.
[0023]
The controller 30 further includes first and second memories 44 and 46 and timing means 48. The first memory 44 stores target demand power set as described later and partial target demand power calculated by the average power calculation means 36. The second memory 46 stores demand power and partial demand power calculated as described later. The time measuring means 48 measures the time, and measures the demand power measurement period and the partial measurement period.
[0024]
The input unit 32 includes, for example, various operation buttons provided on the front surface of a device housing (not shown) of the demand power monitoring device 4, and the target demand power is set by performing an input operation on the input unit 32. . The alarm means 34 is composed of an alarm lamp and / or an alarm buzzer, and issues an alarm to the user by an alarm light in the case of an alarm lamp and by an alarm sound in the case of an alarm buzzer.
[0025]
In this system, a blinking state detection unit 50 is provided in association with the first liquid crystal display device 22. The blinking state detection means 50 shown in the figure is composed of a photoelectric sensor 52, and the photoelectric sensor 52 is composed of a combination of a light emitting element 54 and a light receiving element 56. The light emitting element 54 emits light toward the surface of the first liquid crystal display device 22, and the light receiving element 56 receives reflected light from the surface of the first liquid crystal display device 22. By using such a photoelectric sensor 52, The blinking state of the first liquid crystal display device 22 can be detected easily and accurately with a relatively simple configuration. The blink detection signal from the light receiving element 56 of the photoelectric sensor 52 is sent to the controller 30 of the demand power monitoring device 4.
[0026]
Next, mainly the control by the demand control system described above will be described with reference to FIGS. When the demand power is monitored by the demand control system described above, first, the target demand power is set by performing an input operation on the input means 32 (step S1). Thus, when the target demand power is set, this target demand power is stored in the first memory 44. The average power calculation means 36 calculates the partial target demand power for the partial measurement period (step S2), and the calculated partial target demand power is stored in the first memory 44. When a predetermined time, which is a partial measurement period, elapses, the process proceeds from step S3 to step S4, and demand power for the predetermined time (first partial measurement period) is calculated. This demand power calculation uses a flashing detection signal from the photoelectric sensor 52 that detects the flashing state of the first liquid crystal display device 22, and the demand power calculation means 38 calculates based on this flashing detection signal. The demand power is stored in the second memory 46.
[0027]
Thereafter, power comparison is performed by the power comparison means 40 (step S5). That is, the power comparing means 40 compares the partial demand power in the first partial measurement period with the partial target demand power P1 corresponding to the first partial measurement period, and the partial demand power is the partial target demand power. When P1 is exceeded, the process proceeds from step S6 to step S7, and the operation control means 42 stops the operation of the adjustment load 8 (step S7). Thus, power consumption is suppressed by stopping the operation of the adjustment load 8 , and thus power consumption exceeding the target demand power can be suppressed.
[0028]
On the other hand, when the partial demand power is less than or equal to the partial target demand power P1, the process proceeds from step S6 to step S8, where it is determined whether or not the adjusting means 8 is inactive. In step S9, the operation control means 42 operates the adjustment load 8. If the adjustment load 8 is operating, the operation state of the adjustment load 8 is maintained. In this case, even if the adjustment load 8 is in the activated state, the target demand power is rarely exceeded, and the adjustment load 8 is activated.
[0029]
Then, the process returns from step S10 to step S3 until the demand measurement period elapses, and when the second partial measurement period elapses, the demand power of the second partial measurement period is calculated (step S4). The calculated partial demand power is stored in the second memory 46. Next, as described above, power comparison is performed by the power comparison means 40 (step S5), and the partial target demand corresponding to the second partial measurement period corresponds to the partial demand power in the second partial measurement period. When the electric power P2 is exceeded, the operation control means 42 stops the operation of the adjustment load 8 (step S7). On the other hand, when the partial demand power is equal to or less than the partial target demand power P2, if the adjustment load 8 is stopped, the operation control means 42 operates the adjustment load 8 (step S9). The operating state of the adjustment load 8 is maintained. As described above, steps S3 to S10 are repeatedly performed until the demand measurement period elapses.
[0030]
When the demand measurement period elapses, the demand power calculation means 38 calculates the demand power for this demand measurement period (step S11), and if this demand power is greater than the demand power stored in the second memory 46, this demand power Is newly registered in the second memory 46 (step S13). On the other hand, when the demand power is smaller than the demand power stored in the second memory 46, the demand power is not registered, and the demand power registered in the second memory 46 is maintained. Thereafter, the process returns to step S3, and the above-described monitoring of the demand power is performed in the next demand measurement period, and the demand power is monitored by the demand power monitoring device 4 in this way.
[0031]
FIG. 5 shows a modified form of the demand power monitoring apparatus. In this modified form, substantially the same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted. In this modification, the final partial measurement period of the partial measurement period of the demand power measurement period is further subdivided to calculate the fine partial demand power of the fine partial measurement period, and the fine part corresponding to this fine partial power measurement period The adjustment load is operated and controlled in comparison with the target demand power.
[0032]
In FIG. 5, the controller 30A of the demand power monitoring device 4A of this modified embodiment includes an emergency stop means 62 and a forced operation in addition to the average power calculation means 36A, the demand power calculation means 38A, the power comparison means 40A, and the operation control means 42. Inhibiting means 64 is included. Based on the target demand power set by the input means 32, the average power calculation means 36A is divided into, for example, a partial target demand power in the partial measurement period that divides the demand power measurement period into 15, for example, and a final partial measurement period, for example, six. The fine portion target demand power of the fine portion measurement period (for example, set to about 20 seconds) to be subdivided is calculated in the same manner as described above.
[0033]
Similarly to the above, the demand power calculation unit 38A calculates the demand power during the demand power measurement period and the partial demand power during the partial measurement period based on the blink detection signal from the photoelectric sensor 52, and the final partial measurement period. For, the sub-part demand power for the sub-part measurement period is calculated.
[0034]
Further, the power comparison means 40 compares the partial demand power of the partial measurement period with the partial target demand power corresponding to the partial measurement period when the partial measurement period elapses, and the partial demand power determines the partial target demand power. If it exceeds, the operation control means 42 stops the operation of the adjustment load 8 so as to be within the target demand power. Further, the power comparing means 40 compares the fine partial demand power of the fine partial measurement period with the fine partial target demand power corresponding to the fine partial measurement period at the elapse of the fine partial measurement period of the final partial measurement period. To do. Then, when the fine portion measurement power of the fine portion measurement period exceeds the fine portion target demand power corresponding to the fine portion measurement period when the fine portion measurement period of the final portion measurement period has elapsed, the emergency stop means 62 adjusts the adjustment load. The operation of 8 is urgently stopped. Thus, by making an emergency stop by the emergency stop means 62, it is possible to suppress power consumption even during the final partial measurement period and not to exceed the target demand power. When the operation of the adjustment load 8 is stopped in the fine partial measurement period of the final partial measurement period, the forced operation prohibiting means 64 forces the adjustment load 8 to operate for a predetermined set time (for example, set to the same time as the partial measurement period). The adjustment load 8 is not operated during this predetermined set period. By restricting the operation of the adjustment load 8 in this way, it is possible to prevent a large load from acting on the adjustment load 8. Other configurations of the demand power monitoring apparatus 4A of this modification are substantially the same as those of the embodiment shown in FIGS.
[0035]
As mentioned above, although the embodiment of the demand control system according to the present invention has been described, the present invention is not limited to such an embodiment, and various changes and modifications can be made without departing from the scope of the present invention.
[0036]
For example, in the above-described embodiment, when the partial demand power exceeds the partial target demand power, the entire adjustment load 8 is stopped. However, instead of this configuration, for example, the following may be performed. Good. For example, when the adjustment load 8 is classified into a plurality of groups (for example, three) and the partial target demand power is exceeded, the first group of the adjustment load 8 is stopped, and when the partial target demand power is exceeded again, the adjustment load 8 The second group may be deactivated, and the group of adjustment loads 8 that are deactivated in this way may be sequentially switched. Alternatively, the adjustment load 8 is classified into a plurality of groups (for example, three), and when the partial target demand power is exceeded, the entire adjustment load 8 is deactivated. When the first group is activated and the entire operation is continuously stopped, the second group of the adjustment loads 8 may be activated, and the groups of the adjustment loads 8 to be operated exceptionally in this way may be sequentially switched. .
[0037]
【The invention's effect】
According to the demand control system of claim 1 of the present invention, since the blinking display state of the power consumption state display means for visually confirming the power usage state is detected by the blinking state detection means, the demand power is calculated. The power consumption can be calculated simply and easily by detecting the power consumption state in a state completely separated from the above measurement. The demand power calculation means calculates the demand power in the demand power measurement period and the partial demand power in the partial measurement period, and the power comparison means calculates the partial demand power in the partial measurement period and the partial target demand power corresponding to the partial measurement period. When the partial demand power in the partial measurement period exceeds the partial target demand power corresponding to the partial measurement period, the operation control means stops the operation of the adjustment load. Consumption can be suppressed. In addition, since the power comparison by the power comparison means is performed in comparison with the partial target demand power throughout the demand power measurement period, the power consumption is also adjusted throughout the demand power measurement period, and the adjustment load is adjusted in the latter half of the measurement period. There is no concentration of stoppages. Further, for the final partial measurement period of the partial measurement periods, the fine partial demand power of the fine partial measurement period further subdivided is calculated, and the fine partial demand power and the fine partial target corresponding to the fine partial measurement period are calculated. The demand power is compared with the demand power, and when the sub-part demand power in the sub-part measurement period exceeds the sub-part target power demand corresponding to this sub-part measurement period, the emergency stop means stops the adjustment load, so the demand power measurement period It is possible to further avoid that the demand power exceeds the target demand power.
[0040]
Further, according to the demand control system according to claim 2 of the present invention, since the blinking state detection means is composed of a combination of a light emitting element and a light receiving element, a relatively simple blinking state of the liquid crystal display device of the power meter configuration Can be detected accurately.
[Brief description of the drawings]
FIG. 1 is a diagram schematically illustrating an embodiment of a demand control system according to the present invention.
FIG. 2 is a block diagram schematically showing a main part of the demand control system of FIG. 1;
FIG. 3 is a flowchart showing control by the demand control system of FIG. 1;
FIG. 4 is a diagram for explaining monitoring of demand power according to the flowchart of FIG. 3;
FIG. 5 is a block diagram schematically showing a modification of the demand power monitoring apparatus.
[Explanation of symbols]
2 Composite power meter 4, 4A Demand power monitoring device 6 Load 8 Adjustment load 10 Fixed load 22, 24, 26 Liquid crystal display device 30, 30A Controller 36, 36A Average power calculation means 38, 38A Demand power calculation means 40, 40A Power Comparison means 42 Operation control means 50 Flashing state detection means 52 Photoelectric sensor 62 Emergency stop means 64 Forced operation prohibition means

Claims (2)

A power meter that measures the power supplied to the load, and a demand power monitoring device that monitors the demand power consumed by the fixed load and the regulated load, wherein the demand power monitoring device consumes during the demand power measurement period In a demand control system that forcibly shuts down the regulated load when power is about to exceed target demand power,
The power meter is flashing with a power status display means varying blinking state in accordance with the consumption state of the power, in relation to the power consumption state display means, for detecting a blinking state of the power status display means State detection means is provided, and the demand power monitoring device further includes demand power calculation means for calculating demand power based on a blink detection signal from the blink state detection means, and partial measurement in which the demand power measurement period is divided. Power comparison means for comparing partial demand power of a period with partial target demand power corresponding to the partial measurement period, operation control means for operating control of the adjustment load, and emergency for emergency stop of the adjustment load Stop means, and forced operation prohibiting means for prohibiting the operation of the adjustment load continuously during the partial measurement period when the emergency stop is performed by the emergency stop means , It includes a,
The demand power calculation means is configured to calculate demand power using a blinking state of the power consumption state display means, and the demand power of the demand power measurement period and a partial measurement period obtained by dividing the demand power measurement period When the partial demand power in the partial measurement period exceeds the partial target demand power corresponding to the partial measurement period, the operation control means continuously stops the adjustment load for a predetermined time. Further, the demand power calculating means calculates the fine partial demand power of the fine portion measurement period further subdivided for the final partial measurement period of the partial measurement periods, and the power comparing means The sub-partial demand power in the measurement period is compared with the sub-part target power demand corresponding to the sub-part measurement period, and the sub-part measurement period When the sub-part demand power exceeds a sub-part target power demand corresponding to the sub-part measurement period, the emergency stop means stops the adjustment load, and the forced operation prohibition means stops the adjustment load operation. A demand control system characterized by continuously prohibiting a partial measurement period . The power consumption state display means includes a liquid crystal display device, and the blinking state detection means includes a light emitting element that emits light toward the liquid crystal display device, and a light receiving element that receives reflected light from the liquid crystal display device. consists, demand control system according to claim 1 in which the light receiving signal of the light receiving element, characterized in that it is fed to the demand power monitoring device as the blink detection signal.

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