CN117420384A - Redundant power supply power failure alarm method and circuit - Google Patents
Redundant power supply power failure alarm method and circuit Download PDFInfo
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- CN117420384A CN117420384A CN202311325005.7A CN202311325005A CN117420384A CN 117420384 A CN117420384 A CN 117420384A CN 202311325005 A CN202311325005 A CN 202311325005A CN 117420384 A CN117420384 A CN 117420384A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000002159 abnormal effect Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001149 cognitive effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16509—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using electromagnetic relays, e.g. reed relay
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to the technical field of alarm circuits, in particular to a redundant power supply power failure alarm method and a circuit, which take the characteristic that a power supply indicates that the voltage at two ends of an LED luminous tube is a fixed value as a reference end+ of a voltage comparator, adopt a voltage dividing circuit to divide the power supply voltage and then connect the power supply voltage into a negative end-of the comparator to be compared with the reference end+, output is effective when the power supply voltage is larger than the reference voltage, a relay is attracted to indicate that the power supply is normal, and when the voltage value after the voltage division is smaller than the voltage of the reference end, the output of the voltage comparator is invalid, the relay is released and the indication voltage is abnormal. The invention has accurate identification of the power supply voltage, has a fixed threshold value, can judge whether the power exists or not, and can identify whether the voltage is in a normal range or not; when the power supply loop adopts any brand of safety terminal with fusing indication to supply power, the safety is fused, and the alarm can be normally given.
Description
Technical Field
The invention relates to the technical field of alarm circuits, in particular to a redundant power supply power failure alarm method and a circuit.
Background
The signal conversion system of the existing DCS/PLC control system comprises two types of discrete element wire connection and integrated wiring. Because the industrial device is larger and larger in scale, the system is often thousands of in scale, the debugging and maintenance workload is very large, and the maintenance risk is high, the integrated scheme gradually becomes the main stream of engineering, and the modularized wiring terminal board is more and more commonly used in DCS systems at home and abroad.
Along with the expansion of the scale of the industrial device, the scale of a DCS/PLC control system is also larger and larger, the DCS/PLC control system consists of thousands of meters, the failure risk of a single device is higher and higher, the quality problem of a large-scale product can be caused when the single device is serious, even serious production accidents and device accidents occur, and the normal operation and the production stability of the industrial device are seriously threatened. Meanwhile, the safety production is more and more emphasized from top to bottom in the whole society, and the life safety of staff is emphasized. The safe operation of the device depends on various interlocking protection systems, and the basis of normal operation of the protection systems is a stable power supply. The power supply safety and quality requirements for the control system are thus increasing. In either mode, because of too many direct current electricity meters, the power supply breaking control and protection cost is higher, and a mode that only one path of power supply is provided by a single device is generally adopted. For example, a large number of meters such as safety grids and isolators are used in the system, one set of device can reach tens of thousands of devices, and a group (8 or 16) of devices share one power supply, and the safety terminals are generally adopted for simple overcurrent protection and breaking control. Once a certain instrument is accidentally short-circuited, the power supply insurance of the group is fused, and all the instruments of the group are powered off. Operators find that the production fluctuates greatly and is connected with the presence treatment of maintenance personnel, so that no small loss is caused. The power supply stability and safety of the instrument are ensured, the occurrence of faults is early warned in time, and the instrument is a new requirement provided by a process control system.
To solve this problem, the configuration and monitoring of the power quality and stability of the dc system should satisfy 3 basic requirements:
1. redundant power supply, each device provides two paths of direct current power supply input, and any path of direct current power supply input can maintain normal power utilization of the device;
2. power supply protection, including overvoltage protection and overcurrent protection;
3. abnormal alarms, including under-voltage alarms and power failure alarms.
The power failure alarm circuit in the traditional mode is completed by adopting a direct current relay. As shown in figure 1, the relay coil is directly connected to the power input end, when the direct current power supply is connected, the relay is attracted, and the outside of the contact points are led into the alarm.
Practice proves that the scheme has great defects limited by the electrical characteristics of the relay. Whether the relay acts or not cannot be necessarily related to whether the power supply voltage is normal or not. Taking DC24V as an example, the pull-in voltage of the relay coil is about 50% -150% of the rated voltage, about 12V-35V. But most meters cannot work normally under the condition of being lower than 20V, the suction of the relay represents that the power supply is not normal; secondly, the maintaining current of the relay is smaller, and when the rated voltage of the coil is greater than 5%, the coil can still be maintained in the pull-in state and cannot be released, that is, when the power supply voltage is reduced to 5% from the normal voltage, the relay can still be in the pull-in state, and the electric equipment is powered off.
The latter case has been found in recent years mainly because cabinet power supply designs widely use fuse terminals with fuse indications. The terminal is internally provided with the fusing indicating circuit, the LED luminous tube is connected with the current limiting resistor in series and then connected to the protective tube (as shown in figure 4), and after the fuse is fused, the LED indicating lamp prompts the fuse to be burned out, so that great convenience is brought to maintenance personnel to find out fault points in time. However, after the terminal is blown, a leakage current passes, so that an outlet voltage is not 0 after the fuse is blown, and the relay maintains a suction state. The leakage current of the safety terminal with the LED indication amount of 24VDC on the market is 1-8 mA. Meanwhile, with the progress of electronic technology, the power consumption of the relay is lower and lower, the lower limit of the release voltage reaches 5% of rated voltage, and the lower limit exceeds the cognitive range of people, so that the failure of the power failure alarm function can be caused, and the potential safety hazard is brought to the system operation.
Therefore, the redundant power supply power failure alarm method and circuit are designed, and a simple voltage failure alarm circuit is designed to accurately judge whether the voltage meets the requirements of electric equipment or not, and various abnormal conditions of a power supply loop are shielded.
Disclosure of Invention
The invention provides a redundant power supply power failure alarming method and a circuit for overcoming the defects in the prior art.
A redundant power supply power failure alarm circuit comprises a single-circuit power supply power failure alarm circuit and a double-circuit power supply power failure alarm circuit:
the single-circuit power supply power failure alarm circuit comprises a voltage comparator, wherein the voltage comparator is a high-precision voltage comparator, a power failure detection point is connected into the circuit through a first guide diode, a current limiting resistor and a reference & indication LED provide reference voltages for the positive end of the voltage comparator, and the detection voltages reach a specified threshold value through a first voltage dividing resistor and a second voltage dividing resistor and are connected into the negative end of the voltage comparator; the first redundant diode of the single-circuit power supply power failure alarm circuit is connected with a first pull-up resistor, and the first pull-up resistor is used for improving the potential of a reference end to eliminate interference when the channel is powered down;
the double-circuit power supply power failure alarm circuit comprises a double-channel voltage comparator, the double-channel voltage comparator is a high-precision voltage comparator, a power supply is connected into the circuit through a power supply terminal negative end, a first power supply terminal positive end and a second power supply terminal positive end, the power supply is connected into the input end of the double-channel voltage comparator through a square fuse power supply safety resistor, a piezoresistor, a second guide diode, a third guide diode, a fifth voltage dividing resistor, a third guide diode, a third voltage dividing resistor, a fourth voltage dividing resistor, a second pull-up resistor, a third pull-up resistor, a first power supply indicator lamp and a second power supply indicator lamp, the output end of the double-channel voltage comparator is connected with an alarm relay, and the alarm relay comprises a second relay and a third relay.
A redundant power supply power failure alarm method is characterized in that: the characteristic that the power supply indicates that the voltage at the two ends of the LED is a fixed value is used as a reference end+ of the voltage comparator, a voltage dividing circuit is used for dividing the power supply voltage and then connecting the divided power supply voltage to the negative end-of the comparator to be compared with the reference end+, when the power supply voltage is larger than the reference voltage, the output is effective, the relay is attracted, the power supply is indicated to be normal, when the voltage value after the voltage division is smaller than the voltage of the reference end, the output of the voltage comparator is ineffective, the relay is released, and the indication voltage is abnormal; the action threshold of the power failure alarm can be controlled by adjusting the resistance value of the voltage dividing resistor; a freewheeling diode is arranged on the relay coil to prevent the reverse electromotive force generated when the coil is released from damaging the voltage comparator.
Further, in order to better realize the invention, when the circuit is a single-circuit power supply power failure alarm circuit, the specific method is as follows:
when the power supply voltage of the circuit is higher than a threshold value, the output of the voltage comparator is low, the first relay can be normally attracted, the contact is closed, and the power supply voltage is indicated to be normal; when the power supply voltage is below a threshold value, the voltage comparator output is reversed, the first relay is opened, the contacts are opened, and the power failure or the voltage is identified as being below a specified limit value.
Further, in order to better realize the invention, when the circuit is a double-circuit power supply power failure alarm circuit, the specific method is as follows:
the circuit can identify a fixed voltage threshold, when the power supply voltage is higher than the threshold value, the output of the dual-channel voltage comparator is low, the second relay and the third relay can be normally attracted, the relay contacts are closed, and the power supply voltage is identified to be normal; when the power supply voltage is lower than 21V, the output of the dual-channel voltage comparator is reversed, the second relay and the third relay are disconnected, and the relay contacts are disconnected, so that the power failure or the voltage is identified to be lower than a specified limit value.
The beneficial effects of the invention are as follows:
the voltage comparator is matched with the circuit parameters which are accurately calculated and selected to accurately judge the voltage, so that the power supply can be timely alarmed when the power supply is lower than the normal range of the electric equipment; the characteristic that the voltages at two ends of the LED are relatively fixed is utilized, and the power supply indication LED is simultaneously used as a reference end of the reference voltage of the comparator, so that a circuit is greatly simplified; the common output power supply is used as a reference end to configure a pull-up resistor, so that the potential of the reference end can be pulled up to more than 1.5V when the circuit is powered off, and the anti-interference capability of the comparator is greatly improved; avoiding the influence of leakage current of the power supply loop.
The invention has accurate identification of the power supply voltage, has a fixed threshold value, can judge whether the power exists or not, and can identify whether the voltage is in a normal range or not; when the power supply loop adopts any brand of safety terminal with fusing indication to supply power, the safety is fused, and the alarm can be normally given.
Drawings
FIG. 1 is a diagram of a power loss alarm circuit in a conventional mode;
FIG. 2 is a schematic diagram of a single-circuit power supply failure alarm circuit of the invention;
FIG. 3 is a schematic diagram of a dual-circuit power supply loss alarm circuit of the present invention;
FIG. 4 is a schematic diagram of a fuse terminal with a fuse indication;
fig. 5 is a schematic diagram of a fuse with fuse indicating safety terminal connected to the power failure alarm circuit of the present design.
In the drawing the view of the figure,
1. the first redundant diode, 2, the first guiding diode, 3, the first pull-up resistor, 4, the current limiting resistor, 5, the reference & indication LED,6, the first voltage dividing resistor, 7, the second voltage dividing resistor, 8, the voltage comparator, 9, the first freewheeling diode, 10, the first relay, 11, the negative terminal of the power supply terminal, 12, the positive terminal of the first power supply terminal, 13, the positive terminal of the second power supply terminal, 14, the power failure warning terminal, 15, the power insurance, 16, the piezoresistor, 17, the third voltage dividing resistor, 18, the second relay, 19, the second freewheeling diode, 20, the first power indicator, 21, the fourth voltage dividing resistor, 22, the third relay, 23, the third freewheeling diode, 24, the second power indicator, 25, the two-channel voltage comparator, 26, the second guiding diode, 27, the fifth voltage dividing resistor, 28, the second pull-up resistor, 29, the third guiding diode, 30, the third voltage dividing resistor, 31, the third pull-up resistor, 32, the second redundant diode and 33.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Fig. 1-3 show a specific embodiment of the present invention, which is a redundant power supply power failure alarm method and circuit, and mainly solves the problem of voltage judgment of an alarm circuit formed by simple devices.
The characteristic that the power supply indicates that the voltage at two ends of the LED is a fixed value is utilized as a reference end (+) of the voltage comparator, the voltage dividing circuit is adopted to divide the power supply voltage and then connected into a negative end (-) of the comparator to be compared with the reference end, and when the power supply voltage is larger than the reference voltage, the output is effective, the relay is attracted, and the normal power supply is indicated. When the voltage value after voltage division is smaller than the voltage of the reference end, the output of the voltage comparator is invalid, the relay is released, and the indication voltage is abnormal. And the action threshold of the power failure alarm can be controlled by adjusting the resistance value of the voltage dividing resistor.
Because the amplification factor of the voltage comparator is larger, the common output power supply is used as the reference end to configure the pull-up resistor in the scheme, and the potential of the reference end can be pulled up to more than 1.5V when the circuit is powered down, so that the input end of the voltage comparator has larger deviation, and the anti-interference capability of the comparator is greatly improved. The relay coil is provided with a freewheel diode to prevent the reverse electromotive force generated when the coil is released from damaging the voltage comparator.
As shown in fig. 2, the single-circuit power supply power failure alarm circuit in this embodiment includes a voltage comparator 8, the voltage comparator 8 is a high-precision voltage comparator, a power failure detection point is connected to the circuit through a first guiding diode 2, a current limiting resistor 4 and a reference & indication LED5 provide reference voltages for the positive end of the voltage comparator 8, and the detection voltages reach a specified threshold value through a first voltage dividing resistor 6 and a second voltage dividing resistor 7 and are connected to the negative end of the voltage comparator 8; the first redundant diode 1 of the single-circuit power supply power failure alarm circuit is connected with a first pull-up resistor 3, and the first pull-up resistor 3 is used for improving the potential of a reference end to eliminate interference when the channel is powered down; when the power supply voltage of the circuit is higher than a threshold value, the output of the voltage comparator 8 is low, the first relay 10 can be normally attracted, and the contacts are closed, so that the power supply voltage is indicated to be normal; when the power supply voltage is lower than the threshold value, the output of the voltage comparator 8 is inverted, the first relay 10 is opened, and the contact is opened, and the power loss is identified.
As shown in fig. 3, the dual-path power supply power failure alarm circuit comprises a dual-path voltage comparator 25, the dual-path voltage comparator 25 is a high-precision voltage comparator, a power supply is connected into the circuit through a power supply terminal negative terminal 11, a first power supply terminal positive terminal 12 and a second power supply terminal positive terminal 13, an alarm relay is connected to an output end of the dual-path voltage comparator 25 through a square fuse power supply safety 15, a piezoresistor 16, a second guide diode 26, a third guide diode 29, a fifth voltage dividing resistor 27, a third guide diode 29, a third voltage dividing resistor 17, a fourth voltage dividing resistor 21, a second pull-up resistor 28, a third pull-up resistor 31, a first power supply indicator lamp 20 and a second power supply indicator lamp 24, and the alarm relay comprises a second relay 18 and a third relay 22. The circuit can identify a fixed voltage threshold, when the power supply voltage is higher than the threshold value, the output of the dual-channel voltage comparator 25 is low, the second relay 18 and the third relay 22 can be normally attracted, the relay contacts are closed, and the power supply voltage is identified to be normal; when the power supply voltage is lower than 21V, the output of the two-channel voltage comparator 25 is reversed, the second relay 18 and the third relay 22 are disconnected, and the relay contacts are disconnected and identified as power failure.
Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a redundant power supply loses electric alarm circuit, includes single-circuit power supply loses electric alarm circuit and double-circuit power supply loses electric alarm circuit, its characterized in that:
the single-circuit power supply power failure alarm circuit comprises a voltage comparator (8), wherein the voltage comparator (8) is a high-precision voltage comparator, a power failure detection point is connected into the circuit through a first guide diode (2), a current limiting resistor (4) and a reference & indication LED (5) provide reference voltages for the positive end of the voltage comparator (8), and the detection voltages reach a specified threshold value through a first voltage dividing resistor (6) and a second voltage dividing resistor (7) and are connected into the negative end of the voltage comparator (8); the reference & indication LED (5) of the single-circuit power supply power failure alarm circuit is connected with a first pull-up resistor (3), and the first pull-up resistor (3) is used for improving the potential of a reference end to eliminate interference when the channel is powered off;
the double-circuit power supply power failure alarm circuit comprises a double-channel voltage comparator (25), the double-channel voltage comparator (25) is a high-precision voltage comparator, a power supply is connected into the circuit through a power supply terminal negative end (11), a first power supply terminal positive end (12) and a second power supply terminal positive end (13), an alarm relay is connected to the output end of the double-channel voltage comparator (25) through a square fuse power supply insurance (15) and a piezoresistor (16), a second guide diode (26), a third guide diode (29), a fifth voltage dividing resistor (27), a third guide diode (29), a third voltage dividing resistor (17), a fourth voltage dividing resistor (21), a second pull-up resistor (28), a third pull-up resistor (31), a first power supply indicator lamp (20) and a second power supply indicator lamp (24), and the alarm relay comprises a second relay (18) and a third relay (22).
2. A redundant power supply power failure alarm method is characterized in that: the characteristic that the power supply indicates that the voltage at the two ends of the LED is a fixed value is used as a reference end+ of the voltage comparator, a voltage dividing circuit is used for dividing the power supply voltage and then connecting the divided power supply voltage to the negative end-of the comparator to be compared with the reference end+, when the power supply voltage is larger than the reference voltage, the output is effective, the relay is attracted, the power supply is indicated to be normal, when the voltage value after the voltage division is smaller than the voltage of the reference end, the output of the voltage comparator is ineffective, the relay is released, and the indication voltage is abnormal; the action threshold of the power failure alarm can be controlled by adjusting the resistance value of the voltage dividing resistor; a freewheeling diode is arranged on the relay coil to prevent the reverse electromotive force generated when the coil is released from damaging the voltage comparator.
3. The redundant power supply loss alarm method according to claim 2, wherein when the circuit is a single-circuit power supply loss alarm circuit, the specific method is as follows:
when the power supply voltage of the circuit is higher than a threshold value, the output of the voltage comparator (8) is low, the first relay (10) can be normally attracted, and the contact is closed, so that the power supply voltage is indicated to be normal; when the power supply voltage is lower than a threshold value, the output of the voltage comparator (8) is reversed, the first relay (10) is opened, and the contact is opened and is identified as power failure.
4. The redundant power supply loss alarm method according to claim 2, wherein when the circuit is a two-way power supply loss alarm circuit, the specific method is as follows:
the circuit can identify a fixed voltage threshold, when the power supply voltage is higher than the threshold value, the output of the dual-channel voltage comparator (25) is low, the second relay (18) and the third relay (22) can be normally attracted, the relay contacts are closed, and the power supply voltage is identified to be normal; when the power supply voltage is lower than 21V, the output of the dual-channel voltage comparator (25) is reversed, the second relay (18) and the third relay (22) are disconnected, and the relay contacts are disconnected, so that the power failure or the voltage is identified to be lower than a specified limit value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311325005.7A CN117420384A (en) | 2023-10-13 | 2023-10-13 | Redundant power supply power failure alarm method and circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311325005.7A CN117420384A (en) | 2023-10-13 | 2023-10-13 | Redundant power supply power failure alarm method and circuit |
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| CN117420384A true CN117420384A (en) | 2024-01-19 |
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| CN202311325005.7A Pending CN117420384A (en) | 2023-10-13 | 2023-10-13 | Redundant power supply power failure alarm method and circuit |
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