CN111999662B - Method for detecting external switch state of battery of UPS - Google Patents
Method for detecting external switch state of battery of UPS Download PDFInfo
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- CN111999662B CN111999662B CN202010984347.XA CN202010984347A CN111999662B CN 111999662 B CN111999662 B CN 111999662B CN 202010984347 A CN202010984347 A CN 202010984347A CN 111999662 B CN111999662 B CN 111999662B
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The invention provides a method for detecting the external switch state of a battery of a UPS, which comprises the following steps: the method comprises the following steps: monitoring a battery current of the UPS; step two: if the battery current is lower than a preset current threshold value, turning off a battery charger of the UPS for a period of time and monitoring the battery voltage of the UPS during the period of time; and a third step: and if the battery voltage is lower than a preset voltage threshold value, judging that an external switch of the battery is disconnected.
Description
Technical Field
The invention belongs to the field of power supplies, and particularly relates to a novel method for detecting the external switch state of a battery of an uninterruptible power supply.
Background
An Uninterruptible Power Supply (UPS) is a power supply device that provides uninterrupted, high-quality, reliable ac power to a load, has the functions of real-time protection and monitoring of the power supply state, and plays an important role in improving the power supply quality and ensuring the normal operation of the device. Specifically, the UPS connects an energy storage device (e.g., a storage battery, which is mostly a lead-acid maintenance-free storage battery) to the host, and once the mains power supply is interrupted, the storage battery immediately supplies power to the inverter to ensure the ac output voltage of the UPS power supply. Therefore, in the application of the UPS, whether the battery is correctly connected to the host directly relates to whether uninterrupted power supply can be achieved, and it is necessary to detect the state of an external switch of the battery.
See fig. 1 for a battery charging circuit for the UPS topology. The battery 1 is connected to the charger 3 through the external switch 2, the charger 3 comprises three switching tubes Q1, Q2 and Q3 which are connected in series with each other and diodes D1, D2 and D3 which are respectively connected with the switching tubes Q1, Q2 and Q3 in parallel, in a mains supply working mode, the UPS charges the battery 1 through the charger 3 while supplying power to a load, a current signal SI of the battery detected by the current detection part 5 and a voltage signal SV of the battery detected by the voltage detection part 6 are transmitted to the UPS data processing unit 4, and the battery 1 is connected with a capacitor 7 for filtering high-frequency ripples in parallel. When the battery capacity is saturated soon, the charging current is less, and at this moment, if external switch disconnection, because the battery charger normal work can charge for the electric capacity, the normal voltage that UPS still can detect will be mistaken for external switch normal connection. In order to solve this problem, the prior art uses a special component (not shown in the figure) to detect the state of the external switch and transmit the state signal SS of the external switch to the UPS data processing unit 4, but this requires an external signal line to determine the state of the external switch by detecting a hardware signal connected to the battery terminal.
Disclosure of Invention
Accordingly, it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and to provide a method for detecting an external switch status of a battery of a UPS, comprising the steps of:
the method comprises the following steps: monitoring a battery current of the UPS;
step two: if the battery current is lower than a preset current threshold value, turning off a battery charger of the UPS for a period of time and monitoring the battery voltage of the UPS during the period of time; and
step three: and if the battery voltage is lower than a preset voltage threshold value, judging that an external switch of the battery is disconnected.
According to the method for detecting the external switch state of the battery of the UPS of the present invention, preferably, in the step one, the battery current of the UPS is periodically monitored.
According to the method for detecting the external switch state of the battery of the UPS in the first step, the battery current of the UPS is preferably monitored once every one hour.
According to the method for detecting the external switch status of the battery of the UPS of the present invention, preferably, in the second step, the period of time is set depending on a specific circuit model of the UPS.
According to the method for detecting the external switch state of the battery of the UPS of the present invention, preferably, the period of time depends on a falling slope of a voltage across a capacitor connected in parallel with the battery in the UPS.
The present invention also provides another method for detecting an external switch status of a battery of a UPS, comprising the steps of:
the method comprises the following steps: increasing a charging voltage of a battery of the UPS and limiting a charging current of the battery of the UPS while monitoring the battery voltage;
step two: determining that an external switch of the battery is open if the monitored battery voltage reaches a target value within a preset time.
According to another method for detecting the external switch status of the battery of the UPS of the present invention, preferably, in the first step, the charging voltage is increased by a preset magnitude.
According to another method for detecting the external switch status of the battery of the UPS of the present invention, preferably, the preset amplitude is 10V.
According to another method for detecting the external switch state of the battery of the UPS of the present invention, preferably, the target value is equal to a voltage that can be reached across a capacitor connected in parallel with the battery for the preset time.
Compared with the prior art, the invention has the advantages that: the external switch state of the battery can be detected without arranging special parts, the operation is simple, and the cost is low.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
FIG. 1 is a battery charging circuit for a UPS topology;
FIG. 2 is a flowchart of a method of detecting an external switch state of a battery of a UPS according to a first embodiment of the present invention;
FIG. 3 illustrates changes in the charging current, charging voltage, battery current, external switch state, charger state, and corresponding switch state detection results for a UPS battery according to a first embodiment of the present invention;
FIG. 4 is a flowchart of a method of detecting an external switch state of a battery of a UPS according to a second embodiment of the present invention; and
fig. 5 illustrates changes in the charging current, the battery voltage, the battery current, the external switch state, the charger voltage, and the corresponding switch state detection results of a UPS battery according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
First embodiment
This embodiment provides a method for detecting the external switch status of a battery of a UPS, see the flow chart of the method shown in fig. 2, which includes the steps of:
the method comprises the following steps: controlling the UPS to work in a commercial power mode so as to charge a battery of the UPS;
step two: monitoring a battery current of the UPS;
step three: if the battery current of the UPS is lower than a preset current threshold, turning off a battery charger of the UPS for a period of time and monitoring the battery voltage of the UPS during the period of time, where the current threshold is set according to the current of the battery under the condition of being substantially fully charged, generally 1A by default, and may be set to 0.5A for a battery with a smaller capacity, those skilled in the art can understand that in the field of batteries, a small-density battery (i.e., a small-capacity battery) is generally smaller than 18AH, a large-density battery (i.e., a large-capacity battery) is generally larger than 200AH, and a medium-density battery (i.e., a medium-capacity battery) is arranged between the small-density battery and the large-density battery, and a period of time for disconnecting the charger is set according to the specific circuit model of the UPS, and particularly depends on the descending slope of the voltage across the capacitor;
step four: if the monitored battery voltage of the UPS is stable, judging that an external switch of the battery is closed; if the monitored battery voltage of the UPS decreases to a preset voltage threshold value, the external switch of the battery is judged to be open, and the voltage threshold value depends on the discharge rate of the capacitor and the set time interval (namely the time period for turning off the charger).
To help understand this first embodiment, the present inventors explain a state detection process of an external switch of a battery by means of fig. 3. Fig. 3 shows the charging current of the battery of the UPS, the battery voltage detected by the UPS, the charging voltage, the voltage threshold, the current threshold, the external switch state and the charger state over time, and the corresponding switch state detection results according to the first embodiment of the present invention.
First, a UPS battery is charged with a constant current, preferably a constant large current (for example, a battery with a capacity of 100AH, a default large charging current generally given by a manufacturer is 100AH x (0.15 to 0.25) =15A to 20A). At this time, the UPS detects that the battery voltage rises, the battery voltage reaches a set threshold value at time t1, the battery is charged with a constant voltage, the charging current gradually decreases, the battery voltage reaches equilibrium after slightly falling back, and the battery capacity gradually approaches saturation and is fully charged. During this process, the external switch of the battery is always in a closed state. At time t2, the charging current is below the current threshold set by the current, at which time the battery charger is turned off until time t3, during which time the external switch is closed, and therefore the battery voltage detected by the UPS is always normal, the result of the detection is that the external switch is closed. The battery charger is turned on at time t3 to continue charging the battery. At time t4 the external switch of the battery is opened (either manually or due to a fault), and if the charger remains charged, the detected battery voltage does not change due to the presence of its parallel capacitance, and the UPS can mistakenly assume that the external switch of the battery is closed. To correctly determine the state of the external switch, the charger is turned off at time t5, at which time if the external switch is off, the UPS detects a drop in battery voltage provided by the capacitor connected across the battery in parallel, and at time t6, when the detected battery voltage drops below a set voltage threshold, the external switch is determined to be off, as shown in fig. 3. If the external switch is closed, the voltage detected by the UPS is provided by the battery, and the voltage of the battery is stable.
In an implementation, in order to ensure normal charging of the battery, the battery current is periodically monitored and the battery charger is disconnected when the current is below a threshold value to perform the detection of the switch state, i.e. the battery current is monitored once every period, which depends on the battery charging period of the UPS, i.e. the time required from the start of charging to the full charge, for example 1 hour, the charging periods of different UPS circuits and battery models are different. That is, in this embodiment, the external switch state of the battery is detected on the premise that the battery is fully charged.
Second embodiment
This embodiment provides a method for detecting the external switch status of a battery of a UPS, see the flow chart of the method shown in fig. 4, which includes the steps of:
the method comprises the following steps: controlling the UPS to work in a commercial power mode so as to charge a battery of the UPS;
step two: increasing the charging voltage (preferably by a preset magnitude (e.g. 10V)) and limiting the charging current while monitoring the battery voltage, in particular the charging current value is set according to the battery capacity, e.g. 1A, and the battery capacity hour may be set to 0.5A;
step three: and if the monitored battery voltage reaches the target value within the preset time, judging that the external switch of the battery is disconnected. In this embodiment, the target value depends on the charging current, the charging time and the capacitance value of a capacitor connected in parallel with the battery. The judgment basis is as follows: the battery is equivalent to a capacitor with a larger capacity, and a longer time is needed for charging the battery to a set target voltage by adopting a preset charging current, but if an external switch of the battery is turned off, the charger charges the capacitor connected in parallel with the battery, and the charging current with the same magnitude can enable two ends of the capacitor to reach the target voltage in a shorter time.
For example, if the battery charger normally charges the battery at 540V, the UPS system increases the charging voltage to 550V and limits the charging current to 1A, and if the external switch of the battery is open, the detected battery voltage will reach a target value, e.g., 550V, for a period of time (e.g., 1 s). The target value can be artificially set according to specific situations.
To facilitate understanding of this second embodiment, the inventors explain a state detection process of an external switch of a battery with the aid of fig. 5. Fig. 5 shows the charging current, detected battery voltage, external switch state, target voltage, current threshold and voltage threshold over time for a UPS battery according to an embodiment of the invention and corresponding switch state detection results.
In this embodiment, a UPS battery is charged with a constant large current, the battery voltage rises, and then when the battery voltage reaches a set threshold at time t1, the battery is charged with a constant voltage, the charging current gradually decreases, the battery voltage reaches a balance after slightly falling back, and the battery capacity slowly approaches saturation and is fully charged. During this process, the external switch of the battery is always in a closed state.
At time t2 when the battery is substantially fully charged, the target voltage of the charger is raised until time t3, the time interval between t2 and t3 being set according to the rising slope of the voltage on the capacitor. The voltage on the capacitor is calculated by the formula: (charging current x charging time)/capacitance value.
Since the charging current is limited, the battery voltage does not change significantly during this time even if the charging voltage rises. However, if the external switch of the battery is turned off, the external switch is turned off at time t4 as shown in fig. 5, and the charging voltage is raised again, for example, the charging voltage is raised at time t5 to time t6, and the charger charges the capacitor in the process, so that the voltage across the capacitor can reach a very high voltage in a very short time. For example, if a capacitor of 384 μ F is charged with a current of 1A for 0.5s, the voltage across the capacitor can reach 1302V, and if the detected voltage reaches the target value, it is judged that the external switch of the battery is turned off.
The method for detecting the external switch state of the UPS battery does not need to arrange a special detection part, and has simple operation and low cost.
Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.
Claims (9)
1. A method for detecting an external switch status of a battery of a UPS, the battery being connected to a charger of the UPS via the external switch, a series circuit of the battery and the external switch being connected in parallel with a capacitor, the method comprising the steps of:
the method comprises the following steps: monitoring a battery current of the UPS;
step two: if the battery current is lower than a preset current threshold value, a battery charger of the UPS is closed for a period of time, and the battery voltage of the UPS is monitored in the period of time, wherein the battery voltage is the voltage at two ends of the capacitor; and
step three: and if the battery voltage is lower than a preset voltage threshold value, judging that an external switch of the battery is disconnected.
2. The method of claim 1, wherein in the first step, the battery current of the UPS is periodically monitored.
3. The method for detecting the external switch status of the battery of the UPS of claim 2, wherein in step one, the battery current of the UPS is monitored once every one hour.
4. A method for detecting the status of an external switch of a battery of a UPS as recited in claim 1, wherein in step two, the period of time is set depending on the specific circuit model of the UPS.
5. A method for detecting an external switch state of a battery of a UPS according to claim 4, wherein the period of time is dependent on a falling slope of the voltage across the capacitor.
6. A method for detecting an external switch status of a battery of a UPS, the battery being connected to a charger of the UPS via the external switch, a series circuit of the battery and the external switch being connected in parallel with a capacitor, the method comprising the steps of:
the method comprises the following steps: increasing a charging voltage of a battery of the UPS and limiting a charging current of the battery of the UPS, and simultaneously monitoring a battery voltage, wherein the battery voltage is a voltage across the capacitor;
step two: if the monitored battery voltage reaches a target value within a preset time, it is determined that an external switch of the battery is turned off.
7. The method of claim 6, wherein in step one, the charging voltage is increased by a predetermined magnitude.
8. The method for detecting the external switch state of the battery of the UPS of claim 7 wherein the predetermined magnitude is 10V.
9. A method for detecting an external switch state of a battery of a UPS according to claim 6, wherein the target value is equal to the voltage that can be reached across the capacitor within the preset time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010984347.XA CN111999662B (en) | 2020-09-18 | 2020-09-18 | Method for detecting external switch state of battery of UPS |
| TW110134393A TW202212850A (en) | 2020-09-18 | 2021-09-15 | New method for detecting the status of the external breaker of the battery of ups |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010984347.XA CN111999662B (en) | 2020-09-18 | 2020-09-18 | Method for detecting external switch state of battery of UPS |
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| Publication Number | Publication Date |
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| CN111999662A CN111999662A (en) | 2020-11-27 |
| CN111999662B true CN111999662B (en) | 2023-01-06 |
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| CN202010984347.XA Active CN111999662B (en) | 2020-09-18 | 2020-09-18 | Method for detecting external switch state of battery of UPS |
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| CN (1) | CN111999662B (en) |
| TW (1) | TW202212850A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI762372B (en) * | 2021-07-06 | 2022-04-21 | 大陸商美律電子(深圳)有限公司 | Energy storage device and method thereof for supplying power |
| CN114019389A (en) * | 2021-10-22 | 2022-02-08 | 杭州华塑科技股份有限公司 | Battery open circuit detection method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3330232B2 (en) * | 1994-07-15 | 2002-09-30 | 山洋電気株式会社 | AC / DC uninterruptible power supply |
| CN2600968Y (en) * | 2003-01-17 | 2004-01-21 | 朱惠勇 | UPS uninterruption power supply device |
| CN202815145U (en) * | 2012-10-12 | 2013-03-20 | 广东易事特电源股份有限公司 | UPS storage battery circuit break detection apparatus |
| KR101440531B1 (en) * | 2012-07-09 | 2014-09-17 | 주식회사 엘지화학 | Apparatus and method for diagnosis of electric contactor |
| CN204967356U (en) * | 2015-09-18 | 2016-01-13 | 国网山西省电力公司大同供电公司 | UPS power supply circuit |
| CN103645412B (en) * | 2013-12-25 | 2017-08-25 | 华为技术有限公司 | Battery detection method and device |
| CN105259516B (en) * | 2015-11-11 | 2018-02-13 | 漳州科华技术有限责任公司 | A kind of off-line UPS input switch abnormal detector |
| CN107785987A (en) * | 2016-08-25 | 2018-03-09 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | On-Line UPS |
-
2020
- 2020-09-18 CN CN202010984347.XA patent/CN111999662B/en active Active
-
2021
- 2021-09-15 TW TW110134393A patent/TW202212850A/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3330232B2 (en) * | 1994-07-15 | 2002-09-30 | 山洋電気株式会社 | AC / DC uninterruptible power supply |
| CN2600968Y (en) * | 2003-01-17 | 2004-01-21 | 朱惠勇 | UPS uninterruption power supply device |
| KR101440531B1 (en) * | 2012-07-09 | 2014-09-17 | 주식회사 엘지화학 | Apparatus and method for diagnosis of electric contactor |
| CN202815145U (en) * | 2012-10-12 | 2013-03-20 | 广东易事特电源股份有限公司 | UPS storage battery circuit break detection apparatus |
| CN103645412B (en) * | 2013-12-25 | 2017-08-25 | 华为技术有限公司 | Battery detection method and device |
| CN204967356U (en) * | 2015-09-18 | 2016-01-13 | 国网山西省电力公司大同供电公司 | UPS power supply circuit |
| CN105259516B (en) * | 2015-11-11 | 2018-02-13 | 漳州科华技术有限责任公司 | A kind of off-line UPS input switch abnormal detector |
| CN107785987A (en) * | 2016-08-25 | 2018-03-09 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | On-Line UPS |
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| Publication number | Publication date |
|---|---|
| TW202212850A (en) | 2022-04-01 |
| CN111999662A (en) | 2020-11-27 |
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