KR101906965B1 - Direct current input cooling system in computer room - Google Patents

Abstract

The present invention relates to a DC input type computer room cooling system using a BLDC motor. According to the present invention, the system comprises: a rectifier (110) receiving AC power and rectifying the AC power to DC; a storage battery (120) connected to an output terminal of the rectifier (110) and charged by a DC current supplied from the rectifier (110), and then supplying DC power to a cooling cycle (150) at the time of power failure of the AC power; a room temperature sensor (142) installed in the computer room to be cooled so as to measure the room temperature and outputting the measured room temperature to a controller (140); a controller (140) generating an inverter control signal proportional to the received room temperature value and outputting the inverter control signal to an inverter (130) when the room temperature received from the room temperature sensor (142) is equal to or higher than a predetermined reference room temperature; and the inverter (130) converting the DC power supplied from the rectifier (110) into three phases (U, V, W) AC power, calculating an operating voltage and an operating frequency (Hz) of a compressor (151) on the basis of the inverter control signal input from the controller (140), and outputting a compressor drive control signal to a compressor (151) on the basis of the calculated operating voltage and operating frequency. According to the present invention, air conditioning can be maintained even in the case of power failure.

Description

Technical Field [0001] The present invention relates to a DC input type computer cooling system using a BLDC motor,

The present invention relates to a computer room cooling system, and more particularly, to a DC input type computer room cooling system using a BLDC motor adapted to supply cooling power of a computer room by supplying DC power of a battery in a cooling cycle in the event of a power failure.

Generally, communication equipment (for example, network equipment, servers, communication exchanges, etc.) is provided in a computer room such as a computer room of an enterprise, a bank, a school, a building, a laboratory, And the room temperature is always increased. If it is not cooled, there is a fear that the communication equipment may malfunction due to the overheating. Therefore, the room should be maintained at a proper temperature by using a separate air conditioner.

Therefore, most computer rooms are equipped with air conditioners such as air conditioners and thermostats and hygrostats, and the room temperature is properly maintained by appropriately cooling the room.

Because of the nature of the computer room, it is essential to operate the air conditioner or air conditioner 24 hours a day because of the heat of the communication equipment.

However, if there is a power failure, or if a power failure occurs, the operation of the cooling system in the computer room is stopped.

In order to solve this problem, most of the organizations that are operating and maintaining a spare power source such as a generator are required to have a certain time necessary for the operation of the power source. As a result, the temperature of the corresponding space accumulates heat generated by the equipment, An emergency situation such as a shut-down can not be avoided.

The most important electric load is the battery installed in preparation for such an emergency situation. However, the battery is a device capable of supplying (discharging) by direct current (DC), and when it is applied to the air conditioner, (Air-conditioning) facilities were not available.

In order to cool the computer room, a large amount of electric power was consumed, which resulted in a large electric charge, which was a great burden for maintaining the computer room.

Therefore, a method to reduce electric power charges in a computer room cooling system is becoming a problem.

Document 1: Published Patent Application No. 10-2010-0033803 (Publication date: March 31, 2010) Document 2: Published Japanese Patent Application No. 10-2016-0007845 (Publication date: Jan. 21, 2016)

The object of the present invention is to provide a DC input type computer room cooling system using a BLDC motor according to the present invention,

First, by allowing the battery to supply power even when the power supply is interrupted (for example, in the case of power failure of the AC power supply or abnormality of the self-electric power supply system), normal operation of the cooling cycle is enabled, So that the operation reliability of the communication equipment of the computer room can be ensured,

Second, the DC power of the battery can be supplied to the compressor automatically due to the voltage difference of the battery. Thus, since no separate switching means or switching operation is required, the number of parts can be reduced,

Third, the DC input type power supply system can realize a highly efficient cooling system in which power consumption is significantly reduced compared with the conventional AC power supply system,

Fourth, by adopting BLDC motor, it is possible to improve the output efficiency relative to the input DC voltage,

Fifth, it is possible to protect the compressor when the pressure inside the compressor becomes high,

Sixth, when a control value such as a threshold power control reference value and a threshold power control reference time is set and an incoming power greater than the threshold power control reference value is to be supplied at a power supply supplier critical power holding time or more, To reduce the incoming power value by supplying power to the cooling cycle so as to prevent the "critical power" value, which is a criterion for calculating the basic charge in the electric power charge, from rising, that is, Of the total amount,

Seventh, by allowing the threshold power value to be managed and controlled to be equal to or less than the threshold power-based set value, the base rate in the electricity rate can be lowered,

Eighth, a DC input type using a BLDC motor which is adapted to more precisely control the threshold power by using the output power value of the battery as a basis of the threshold power control and to prevent unnecessary waste of electric power To provide a computer room cooling system.

To achieve the above object, a DC input type computer room cooling system using a BLDC motor according to the present invention includes a cooling cycle including a compressor, a condenser, an expansion valve, and an evaporator, a rectifier that receives AC power and rectifies the DC power into DC, An accumulator connected to an output terminal of the rectifier for charging by a DC current supplied from a rectifier and supplying DC power in a cooling cycle at the time of power interruption of the AC power supply, A controller for generating an inverter control signal proportional to the received room temperature value and outputting an inverter control signal to the inverter when the room temperature received from the room temperature sensor is equal to or higher than a predetermined reference room temperature; , The DC power supplied from the rectifier is converted into three-phase (U, V, W) AC power An inverter for calculating an operation voltage and an operation frequency of the compressor based on an inverter control signal inputted from the controller and outputting a compressor drive control signal to the compressor based on the calculated operation voltage and the operation frequency, And the compressor is driven in accordance with a compressor drive control signal output from the inverter.

The DC input type computer room cooling system using the BLDC motor having the above-described configuration has the following effects.

First, by allowing the battery to supply power even when the power supply is interrupted (for example, in the case of power failure of the AC power supply or abnormality of the self-electric power supply system), normal operation of the cooling cycle is enabled, And as a result, the operation reliability of the communication equipment of the computer room can be secured.

Secondly, the DC power of the battery can be automatically supplied to the compressor by the voltage difference of the battery. As a result, there is no need for any separate switching means or switching operation, thereby reducing the number of components and reducing system construction cost.

Third, there is an effect that a highly efficient cooling system in which power consumption is significantly reduced by the DC input type power supply system rather than the conventional AC power supply system can be realized.

Fourth, the adoption of BLDC motor has the effect of improving the output efficiency compared to the input DC voltage.

Fifth, when the pressure inside the compressor becomes high, it is possible to protect the compressor.

Sixth, when a control value such as a threshold power control reference value and a threshold power control reference time is set and an incoming power greater than the threshold power control reference value is to be supplied at a power supply supplier critical power holding time or more, It is possible to reduce the incoming power value by supplying power to the cooling cycle, and as a result, it is possible to prevent an increase in the "critical power" Or more can be prevented.

Seventh, by allowing the threshold power value to be managed and controlled to be equal to or less than the threshold power reference set value, the base rate of the electricity rate can be lowered, and the electric power charge can be reduced.

Eighth, by using the output power value of the battery as a basis of the threshold power control, the threshold power control can be made more precise, and unnecessary power can be prevented from being wasted.

1 is a block diagram of a DC input type computer room cooling system using a BLDC motor according to an embodiment of the present invention.
2 is a block diagram of a DC input type computer room cooling system using a BLDC motor according to another embodiment of the present invention.
3 is a flowchart of a control method using a DC input type computer room cooling system using a BLDC motor according to an embodiment of the present invention.

Hereinafter, preferred embodiments of a DC input type computer room cooling system using the BLDC motor of the present invention will be described in detail with reference to the accompanying drawings.

1, a DC input type computer room cooling system using a BLDC motor according to an embodiment of the present invention includes a compressor 151, a condenser 152, an expansion valve 153, and an evaporator 154 A rectifier 110 connected to the output terminal of the rectifier 110 and charged with a direct current supplied from the rectifier 110, A room temperature sensor 142 installed in the computer room to measure the room temperature and outputting the measured room temperature to the controller 140; A controller 140 for generating an inverter control signal proportional to the received indoor temperature value and outputting an inverter control signal to the inverter 130 when the indoor temperature received from the indoor temperature sensor 142 is equal to or higher than a predetermined reference indoor temperature ), And phase (U, V, W) AC power supplied from the rectifier 110 to the AC power of three phases (U, V, W) And a compressor (151) for outputting a compressor drive control signal to the compressor (151) based on the calculated operation voltage and the operation frequency, wherein the compressor (151) 130) according to the compressor driving control signal.

According to this, when the power supply from the AC power source is interrupted, for example, in the case of instantaneous power failure, the cooling cycle can be operated using the DC power source charged in the battery 120, There is an advantage that can be maintained.

Particularly, in a normal state without a power failure, since the storage battery 120 always uses the direct current supplied from the rectifier 110 and is charged, the battery 120 is always in a fully charged state. Therefore, a separate power supply for supplying the DC power It is not necessary to receive.

When there is a power failure, since the voltage of the battery 120 is higher than the voltage of the rectifier 110, since the battery 120 is fully charged, the voltage of the battery 120 is higher than the voltage of the cooling cycle, The DC power of the storage battery 120 can be automatically supplied to the cooling cycle 150 by the car so that no separate switching means or boosting device is required.

The DC input type computer room cooling system using a BLDC motor according to an embodiment of the present invention further includes a speed sensor 151b for detecting the rotational speed of the BLDC motor 110. The compressor 151 is configured to detect the rotational speed of the BLDC motor 110, The controller 140 controls the rotation of the BLDC motor 151a from the speed sensor 151b and controls the rotation of the BLDC motor 151a by the rotation of the BLDC motor 151a, And generates a control signal for controlling the rotation of the BLDC motor 151a according to the received rotation speed and outputs the control signal to the inverter 130. The inverter 130 drives the BLDC motor 151a, And outputs a drive control signal.

As described above, by adopting the BLDC motor 151a as the configuration for driving the compressor 151, there is an advantage that the output efficiency relative to the input DC voltage can be improved.

In a DC input type computer room cooling system using a BLDC motor according to an embodiment of the present invention, the inverter 130 is preset and stored with a low pressure stop pressure set value and a high pressure stop pressure set value, and the compressor 151 And outputs a drive control signal for stopping the driving of the compressor 151 when the pressure of the compressor 151 received is equal to or lower than the low pressure stop pressure set value or the high pressure stop pressure set value do.

A block diagram of a DC input type computer room cooling system using a BLDC motor according to another embodiment of the present invention is shown.

2, in a DC input type computer room cooling system using a BLDC motor according to another embodiment of the present invention, a switching operation is performed in response to a switching on / off control signal output from the controller 140, A power switch SW1 for interrupting the power supply to the rectifier 110 and a power meter Vm for detecting the power supplied to the rectifier 110 from the AC power source.

At this time, the controller 140 determines whether or not the "critical power control time period ", which is set to be shorter than the " critical power time" Quot ;, and "threshold power control reference value" are stored in the internal memory, and the power value received from the power meter (Vm) is input to compare the incoming power value with the threshold power control reference value, And outputs a switching off control signal for opening the power switch SW1 to the power switch SW1 when it is determined that the power control value is equal to or greater than the power control reference value.

Then, the controller 140 blocks the supply of power that is greater than the threshold power control reference value to the supply power at or above the "threshold power control reference time ", so that the threshold power value determined by the power supply company is less than a predetermined threshold power control reference value To be prevented from being increased.

The "critical power control reference time" (t) is a time period during which the power supply company (for example, KEPCO) sets the threshold power control time (15 minutes in case of KEPCO), for example, 14 minutes, which is smaller than 15 minutes.

The reason why the threshold power control reference time is set is that even if a power higher than the critical power control reference value is used in the computer room, it is not the "critical power" It is intended to control the total used power amount of the computer room as the control value of the threshold power control reference time.

The "critical power control reference value" is a value smaller than the contracted power value, which is the maximum amount of power that can be supplied by the contract with the power supplier, and is a control value for preventing the threshold power value from being set beyond the threshold power control reference value.

According to the above configuration, when the incoming power having a value equal to or greater than the "threshold power control reference value" is supplied, the supply power value is lowered before the power supply company's " ), There is an advantage that the threshold power, which is a criterion for estimating the electric power base charge, can be prevented from being formed at a value larger than the threshold power control reference value.

As a result, it is possible to manage and control the critical power, which is a criterion for calculating the basic charge in the electric power charges, so as not to exceed the "threshold electric power control reference value"

In the DC input type computer room cooling system using the BLDC motor according to another embodiment of the present invention, the controller 140 reads the voltage value of the battery 120, and when the read voltage value is smaller than the set minimum reference voltage value And a switching-on control signal is output to the power switch SW1.

If the voltage value that is read is smaller than the reference voltage value, a reverse current may flow and an operation error of the cooling system may occur. Therefore, the AC power is sent to the rectifier to operate the cooling cycle.

The operation of the DC input type computer room cooling system using the BLDC motor according to one embodiment of the present invention will be described below.

The power supplied from the AC power source is rectified to DC from the rectifier 110, and the DC current is charged to the battery 120, so that the voltage of the battery 120 is maintained in the full charge state.

The DC power supplied from the rectifier 110 is converted into three-phase (U, V, W) AC power by the inverter 130 to calculate the operating voltage and the operating frequency (Hz) of the compressor 151, And outputs the compressor drive control signal to the compressor 151 based on the operation voltage and the operation frequency, so that the compressor is driven and the cooling cycle is operated.

If there is a power failure due to a cause, the current does not flow to the output terminal of the rectifier 110, and therefore the DC power is automatically applied to the inverter 130 by the voltage difference in the fully charged battery 120.

Therefore, since the current of the battery 120 is directly supplied to the cooling cycle immediately after the power failure, no separate control operation is required.

Next, a control method for saving electric power charges will be described.

First, "critical power control reference time" (e.g., 14 minutes less than 15 minutes) and "critical power control reference value" are stored in advance in the internal memory of the controller 140.

When the power meter Vm detects the incoming power Pt and sends it to the controller 140, the controller 140 compares the set threshold power control reference value with the incoming power value (S312).

If it is determined that the input power value is larger than the threshold power control reference value (S314), the controller 140 drives an internal timer (S316).

If the controller 140 determines that the S314 state is maintained until the switching control reference time is reached (S318), that is, if the incoming power value is greater than the threshold power control reference value, the controller 140 controls the power switch SW1, And outputs a switching-off control signal (S320).

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is self-evident to those who have.

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

110: rectifier
SW1: Power switch
Vm: Power meter
120: Battery
130: inverter
140:
142: Room temperature sensor
151: Compressor
151a: BLDC motor
151b: Speed sensor

Claims (4)

A cooling cycle 150 including a compressor 151, a condenser 152, an expansion valve 153, and an evaporator 154,
A rectifier 110 for receiving an AC power source and rectifying it to DC,
A battery 120 connected to an output terminal of the rectifier 110 and charged with a DC current supplied from the rectifier 110 and supplying DC power to the cooling cycle 150 during a power failure of the AC power source,
A room temperature sensor 142 installed in the computer room to measure the room temperature and outputting it to the controller 140,
A controller 140 for generating an inverter control signal proportional to the received indoor temperature value and outputting an inverter control signal to the inverter 130 when the indoor temperature received from the indoor temperature sensor 142 is equal to or higher than a predetermined reference indoor temperature )Wow,
(U, V, W) AC power supplied from the rectifier 110 to the AC power of the compressor 151 based on the inverter control signal input from the controller 140, And an inverter (130) for calculating a frequency (Hz) and outputting a compressor drive control signal to the compressor (151) based on the calculated operation voltage and the operation frequency,
Wherein the compressor (151) is driven according to a compressor drive control signal output from the inverter (130).
The method according to claim 1,
A speed sensor 151b for detecting the rotational speed of the BLDC motor 151a,
The compressor 151 has a built-in BLDC motor 151a. The compressor 151 is driven by the rotation of the built-in BLDC motor 151a to operate the cooling cycle,
The controller 140 receives the rotation speed of the BLDC motor 151a from the speed sensor 151b and generates a control signal for controlling the rotation of the BLDC motor 151a according to the received rotation speed, ),
And the inverter (130) outputs a compressor drive control signal to the BLDC motor (151a). The DC input type computer room cooling system using the BLDC motor.
The method of claim 2,
The inverter 130 stores the low-pressure stop pressure set value and the high-pressure stop pressure set value in advance,
And outputs a drive control signal for stopping the operation of the compressor 151 when the compressor 151 receives the pressure and the pressure of the compressor 151 received is equal to or lower than the low pressure stop pressure set value or the high pressure stop pressure set value A DC input type computer room cooling system using a BLDC motor.
The method according to claim 1,
A power switch SW1 for performing a switching operation in accordance with the switching on / off control signal outputted from the controller 140 to intermittently supply power from the AC power source to the compressor 151,
Further comprising a power meter (Vm) for detecting power drawn from the AC power source to the rectifier (110)
The controller (140)
The threshold power control reference time and the threshold power control reference value are stored in the internal memory and the total power amount inputted from the power meter Vm into the computer room is inputted to compare the power value inputted into the computer room with the threshold power control reference value Off control signal for opening the power switch (SW1) to the power switch (SW1) when it is determined that the incoming power value is maintained at the threshold power control reference value or more for the threshold power control reference time In addition,
It is possible to prevent the incoming power greater than the threshold power control reference value from being supplied in excess of the "threshold power control reference time" so as to prevent the threshold power value set by the power supply company from exceeding a predetermined threshold power control reference value DC input type computer room cooling system using BLDC motor.

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