CN211790720U

CN211790720U - Machine room power monitoring and protecting system

Info

Publication number: CN211790720U
Application number: CN202020330838.8U
Authority: CN
Inventors: 熊家兴
Original assignee: Wuxi Shengminghua Technology Co ltd
Current assignee: Wuxi Shengminghua Technology Co ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-10-27
Anticipated expiration: 2030-03-16

Abstract

The utility model relates to the field of cabinet power monitoring, and discloses a machine room power monitoring protection system, which comprises a current transformer, a power supply, a first comparator, a second comparator, a reverser, a reference voltage circuit, a first photoelectric coupler, a second photoelectric coupler, a first intermediate relay and a second intermediate relay, wherein the current transformer outputs detection voltage, the reference voltage circuit generates high-voltage threshold voltage and low-voltage threshold voltage, the first comparator compares the detection voltage with the high-voltage threshold voltage, when the detection voltage is higher than the high-voltage threshold voltage, the first comparator drives the first intermediate relay to be electrified through the first photoelectric coupler, the second comparator compares the detection voltage with the low-voltage threshold voltage, when the detection voltage is lower than the low-voltage threshold voltage, and the second comparator drives the second intermediate relay to be electrified through the second photoelectric coupler, so that power-off protection is realized. The utility model discloses simple structure, it is with low costs, direct action when the power control protection moreover, no signal conversion process.

Description

Machine room power monitoring and protecting system

Technical Field

The utility model relates to a computer lab power control protection field, concretely relates to computer lab power control protection system.

Background

When the data center machine room runs, the power supply of each cabinet needs to be monitored and protected, when the input power supply voltage of each cabinet is too high or too low, the power supply needs to be disconnected in time, and otherwise, the electronic equipment in the cabinets can be damaged. The common power monitoring system adopts a current transformer to adopt the power voltage, the control unit performs AD conversion on an analog quantity signal output by the current transformer through the AD converter, converts the analog quantity signal into a digital quantity signal, judges whether the voltage is excessive or low through the digital quantity signal, and timely disconnects a cabinet power supply when abnormity occurs, so that power monitoring protection is realized, but the scheme has higher use cost, and the signal output by the current transformer needs to be converted and calculated, so that certain time delay exists.

SUMMERY OF THE UTILITY MODEL

In view of the deficiency of the background art, the utility model provides a computer lab power supply monitoring protection system, the technical problem that solve is that current power supply monitoring protection system use cost is high, has certain time delay when monitoring the protection.

For solving the technical problem, the utility model provides a following technical scheme: a machine room power monitoring and protecting system comprises a current transformer, a power supply, a first comparator, a second comparator, an inverter, a reference voltage circuit, a first photoelectric coupler, a second photoelectric coupler, a first intermediate relay and a second intermediate relay;

a reference voltage circuit electrically connected to the power supply and configured to output a high voltage threshold voltage and a low voltage threshold voltage; the current transformer is configured to detect the magnitude of the input current of the cabinet, the output end of the current transformer is electrically connected with the positive input end of the first comparator and the positive input end of the second comparator, the negative input end of the first comparator is connected with the high-voltage threshold voltage, the negative input end of the second comparator is connected with the low-voltage threshold voltage, the output end of the first comparator is electrically connected with the optocoupler input end of the first optocoupler, one output end of the first optocoupler is electrically connected with the power supply through the first resistor, the other output end of the first optocoupler is electrically connected with the control coil of the first intermediate relay, and the power supply is also electrically connected with the control coil of the first intermediate relay through a pair of normally open contacts of the first intermediate;

the output end of the second comparator is electrically connected with the input end of the reverser, the output end of the reverser is electrically connected with the optocoupler input end of the second optoelectronic coupler, one output end of the second optoelectronic coupler is electrically connected with a power supply through a second resistor, the other output end of the second optoelectronic coupler is electrically connected with a control coil of a second intermediate relay, and the power supply is also electrically connected with the control coil of the second intermediate relay through a pair of normally open contacts of the second intermediate relay; and the cabinet power supply is connected into the cabinet through the normally closed contact of the first intermediate relay and the normally closed contact of the second intermediate relay.

The reference voltage circuit comprises a third resistor, a fourth resistor and a fifth resistor which are sequentially connected in series, the third resistor is electrically connected with the power supply, and the fifth resistor is grounded.

The power supply is a 24V direct current power supply.

The power supply is also electrically connected with the overcurrent indicating lamp through the normally open contact of the first intermediate relay, and the power supply is also electrically connected with the low-current indicating lamp through the normally open contact of the second intermediate relay.

The utility model discloses the theory of operation is as follows, current transformer exports detection voltage according to the input current size, first comparator carries out the comparison to detection voltage and high-pressure threshold voltage, when detection voltage is higher than high-pressure threshold voltage, first comparator exports high level to first optoelectronic coupler, first optoelectronic coupler's output switches on, first auxiliary relay's control coil circular telegram, its normally closed contact disconnection, normally open contact is closed, disconnection rack power, the power still inserts control coil through first auxiliary relay's normally open contact, when first comparator does not have high level signal output, first auxiliary relay's control coil still is electrified, realize self-locking control.

The second comparator compares detection voltage and low pressure threshold voltage, when detection voltage is less than low pressure threshold voltage, the second comparator inputs low level signal to the reverser, the reverser inputs high level signal to the second photoelectric coupler, the output of second photoelectric coupler switches on, the control coil of second auxiliary relay circular telegram, its normally closed contact disconnection, normally open contact closure, disconnection rack power, the power still inserts its control coil through the normally open contact of second auxiliary relay, when the reverser does not have high level signal output, the control coil of second auxiliary relay still gets electric, realize self-locking control.

Compared with the prior art, the utility model beneficial effect who has is: the detection voltage output by the voltage sensor is compared through the comparator, signal conversion processing is not needed, the protection action time is shortened, in addition, the structure is simple, and the use cost is reduced.

Drawings

The utility model discloses there is following figure:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of a reference voltage circuit according to the present invention;

fig. 3 is a schematic diagram of the connection between the first photoelectric coupler and the first intermediate relay according to the present invention;

fig. 4 is a schematic diagram of the connection between the second photoelectric coupler and the second intermediate relay according to the present invention.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1, a machine room power monitoring and protecting system includes a current transformer 2, a power supply 1, a first comparator C1, a second comparator C2, an inverter a1, a reference voltage circuit 3, a first photocoupler 4, a second photocoupler 6, a first intermediate relay 5 and a second intermediate relay 7;

in fig. 2, the reference voltage circuit 3 includes a third resistor R3, a fourth resistor R4, and a fifth resistor R5, the third resistor R3 is electrically connected to the power supply 1, the power supply 1 is a direct current voltage of 24V, the power supply 1 outputs a high voltage threshold voltage V1 through the third resistor R3, and outputs a low voltage threshold voltage V2 through the third resistor R3 and the fourth resistor R4;

the current transformer 2 is configured to detect the magnitude of the cabinet input current, the output end of the current transformer 2 is electrically connected with the positive input end of the first comparator C1 and the positive input end of the second comparator C2, the negative input end of the first comparator C1 is connected with the high-voltage threshold voltage V1, and the negative input end of the second comparator C2 is connected with the low-voltage threshold voltage V2;

IN fig. 3, the output terminal of the first comparator C1 is electrically connected to the optocoupler input terminal IN1 of the first optocoupler 5, one output terminal OUT1 of the first optocoupler is electrically connected to the power supply 1 through the first resistor R1, the other output terminal OUT2 is electrically connected to the control coil KM1 of the first intermediate relay 5, and the power supply 1 is further electrically connected to the control coil KM1 of the first intermediate relay 5 through a pair of normally open contacts of the first intermediate relay 5; the power supply 1 is also electrically connected with an overcurrent indicator light LED1 through a normally open contact of the first intermediate relay 4, when the power supply of the cabinet is overvoltage, the control coil KM1 of the first intermediate relay 4 is electrified, the normally open contact is closed, and the overcurrent indicator light LED1 is electrified to give out light for prompting.

IN fig. 4, the output terminal of the second comparator C2 is electrically connected to the input terminal of the inverter a1, the output terminal of the inverter a1 is electrically connected to the optical coupling input terminal IN1 of the second photoelectric coupler 6, one output terminal OUT1 of the second photoelectric coupler 6 is electrically connected to the power supply 1 through the second resistor R2, the other output terminal OUT2 is electrically connected to the control coil KM2 of the second intermediate relay 7, and the power supply 1 is further electrically connected to the control coil KM2 of the second intermediate relay 7 through a pair of normally open contacts of the second intermediate relay 7; a cabinet power supply is connected into the cabinet through a normally closed contact of the first intermediate relay 5 and a normally closed contact of the second intermediate relay 6; the power supply 1 is also electrically connected with a low-current indicator lamp LED2 through a normally open contact of the second intermediate relay 7, when the cabinet power supply is in low voltage, the control coil KM2 of the second intermediate relay 7 is electrified, the normally open contact is closed, and the low-current indicator lamp LED2 is electrified to give out light.

In this embodiment, VCC also represents the power supply 1.

When carrying out the control protection to the rack power, current transformer 2 output detection voltage, first comparator C1 compares detection voltage and high-voltage threshold voltage V1, when detection voltage is higher than high-voltage threshold voltage V1, first comparator C1 exports the high level to first photoelectric coupler 4, the output of first photoelectric coupler 4 switches on, the control coil KM1 of first intermediate relay 5 circular telegram, its normally closed contact disconnection, normally open contact closure, the disconnection rack power, power 1 still inserts control coil KM1 through the normally open contact of first intermediate relay 4, when first comparator C1 does not have high level signal output, the control coil KM1 of first intermediate relay 4 still gets electricity, realize self-locking control.

The second comparator C2 compares the detection voltage with the low-voltage threshold voltage V2, when the detection voltage is lower than the low-voltage threshold voltage V2, the second comparator C2 inputs a low-level signal to the inverter A1, the inverter A2 inputs a high-level signal to the second photoelectric coupler 6, the output end of the second photoelectric coupler 6 is conducted, the control coil KM2 of the second intermediate relay 7 is electrified, the normally closed contact of the second intermediate relay is disconnected, the normally open contact of the second intermediate relay is closed, the cabinet power supply is disconnected, the power supply 1 is also connected to the control coil KM2 through the normally open contact of the second intermediate relay 7, and when the inverter A1 does not output a high-level signal, the control coil KM2 of the second intermediate relay 7 is still electrified, and self-locking control is realized.

In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a computer lab power monitoring protection system, includes current transformer, its characterized in that: the circuit also comprises a power supply, a first comparator, a second comparator, an inverter, a reference voltage circuit, a first photoelectric coupler, a second photoelectric coupler, a first intermediate relay and a second intermediate relay;

the reference voltage circuit is electrically connected with the power supply and is configured to output a high voltage threshold voltage and a low voltage threshold voltage; the current transformer is configured to detect the magnitude of input current of the cabinet, the output end of the current transformer is respectively and electrically connected with the positive input end of the first comparator and the positive input end of the second comparator, the negative input end of the first comparator is connected with a high-voltage threshold voltage, the negative input end of the second comparator is connected with a low-voltage threshold voltage, the output end of the first comparator is electrically connected with the optocoupler input end of the first optocoupler, one output end of the first optocoupler is electrically connected with a power supply through a first resistor, the other output end of the first optocoupler is electrically connected with a control coil of the first intermediate relay, and the power supply is also electrically connected with the control coil of the first intermediate relay through a pair of normally open contacts of the first intermediate relay;

2. The machine room power monitoring and protecting system according to claim 1, wherein: the reference voltage circuit comprises a third resistor, a fourth resistor and a fifth resistor which are sequentially connected in series, the third resistor is electrically connected with the power supply, and the fifth resistor is grounded.

3. The machine room power monitoring and protecting system according to claim 1, wherein: the power supply is a 24V direct current power supply.

4. The machine room power monitoring and protecting system according to claim 1, wherein: the power supply is also electrically connected with the overcurrent indicating lamp through the normally open contact of the first intermediate relay, and the power supply is also electrically connected with the low-current indicating lamp through the normally open contact of the second intermediate relay.