CN108832686B - Charging circuit and charging circuit detection method - Google Patents
Charging circuit and charging circuit detection method Download PDFInfo
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- CN108832686B CN108832686B CN201810691076.1A CN201810691076A CN108832686B CN 108832686 B CN108832686 B CN 108832686B CN 201810691076 A CN201810691076 A CN 201810691076A CN 108832686 B CN108832686 B CN 108832686B
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000004146 energy storage Methods 0.000 claims abstract description 45
- 230000002159 abnormal effect Effects 0.000 claims description 9
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- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000005856 abnormality Effects 0.000 claims description 6
- 230000005236 sound signal Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 9
- 230000006872 improvement Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
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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
Abstract
The invention provides a charging loop and a detection method thereof, wherein the charging loop is used for charging an energy storage module, and the detection method of the charging loop comprises the following steps: a. detecting the voltage of an energy storage module in a charging loop through a voltage detection module; b. the control module compares the detected voltage of the energy storage module with a preset value; c. when the voltage of the energy storage module accords with the preset voltage value, starting charging; and when the voltage of the energy storage module is not consistent with the preset voltage value, an alarm is given out through an alarm device. According to the charging loop detection method provided by the invention, when the connection is broken due to an emergency in the charging process, the alarm information can be sent out in time to inform relevant personnel to process, so that the risk of insufficient power of the energy storage module due to the failure of effective charging is avoided.
Description
Technical Field
The invention relates to a charging circuit and a charging circuit detection method.
Background
With the development of human society and technology, rechargeable energy storage modules are used in more and more application scenes. The rechargeable energy storage module can be used as a main energy source to directly supply power to equipment, such as electric toys, electric tools, electric bicycles, electric automobiles and the like. The wind power generation variable pitch system can also be used as a backup power supply of equipment, and when a main power supply of the equipment is accidentally disconnected, the equipment is guaranteed to continue to normally work, such as an uninterruptible power supply of a server, the backup power supply of the wind power generation variable pitch system and the like.
Rechargeable energy storage modules are typically recharged in a short-circuit situation using a charger. The charger generally has a protection function, and when the energy storage module is charged, the charger can detect parameters such as voltage, current and temperature of the energy storage module in real time, and when the parameters reach preset values, the charger can judge whether the energy storage module is fully charged or abnormal, and stop charging when the conditions occur.
However, the conventional charger does not have a charging loop detection function. In the charging process, if the charging loop is abnormal and normal charging cannot be continued, for example, when the loop is connected and opened/disconnected due to some reason, the conventional charger cannot timely judge that the abnormality occurs and send out a warning signal to inform related personnel to process the abnormality.
It may be less important in a typical application scenario if this condition is detected, but it may be more important in some application scenarios where power cannot be turned off. For example, an uninterruptible power supply of a server, a backup power supply of a wind power generation pitch control system, and the like, in these systems, the electric quantity of the energy storage module must be constantly kept in a full-electric state or a state with more electric quantity, and if the energy storage module is in a power-deficient state due to the fact that a loop is disconnected, the energy storage module cannot be normally charged, failure risk may be brought to the whole system, and improvement is urgently needed.
Disclosure of Invention
The invention aims to provide a charging circuit and a charging circuit detection method.
In order to achieve one of the above objects, the present invention provides a method for detecting a charging loop, including the steps of: a. detecting the voltage of an energy storage module in a charging loop through a voltage detection module; b. the control module compares the detected voltage of the energy storage module with a preset value; c. when the voltage of the energy storage module accords with the preset voltage value, starting charging; and when the voltage of the energy storage module is not consistent with the preset voltage value, an alarm is given out through an alarm device.
As a further improvement of the present invention, in the step b, the detected magnitude and polarity of the voltage of the energy storage module are compared with a preset value.
As a further improvement of the present invention, the method for detecting a charging loop further comprises the steps that the control module accesses a dummy load in the charging loop according to a preset time interval; comparing the voltage variation value of the dummy load during the access period with a preset standard value; when the variation value of the voltage is smaller than the preset standard value, the charging loop operates normally; when the variation value of the voltage is larger than the preset standard value, the charging circuit has an abnormality.
As a further improvement of the present invention, when there is an abnormality in the charging circuit, an alarm is issued by an alarm device.
As a further improvement of the present invention, the predetermined time interval is 10 seconds.
As a further improvement of the present invention, the dummy access duration is 5 milliseconds.
To achieve one of the above objects, the present invention provides a charging circuit for charging an energy storage module, including: the power conversion module converts alternating current into direct current for charging the energy storage module; the voltage detection module is used for detecting the voltage in the charging loop; the control module controls the charging loop to work in a preset mode; the charging circuit further comprises an alarm device and a dummy load module, the control module is connected into the dummy load module in the charging circuit in a preset mode, the voltage change condition of the charging circuit during the connection of the dummy load module is detected, and when the voltage change is larger than a preset value, the alarm device sends out alarm information.
As a further improvement of the present invention, the dummy load module includes a power resistor, and a ratio of the output voltage Uo of the power conversion module to the resistance R of the power resistor is greater than the maximum load current Io output by the power conversion module.
As a further improvement of the invention, the alarm device comprises an LED lamp, and the LED lamp emits light signals to warn.
As a further improvement of the invention, the alarm device comprises a loudspeaker, and the alarm device emits an acoustic signal alarm through the loudspeaker.
Compared with the prior art, the charging loop and the charging loop detection method provided by the invention can detect the condition of the charging loop in the charging process, and when the charging loop has a fault, such as switch tripping, fuse fusing, poor contact of a connector and the like, alarm information is sent in time to inform related personnel of processing. The risk that the whole system is out of work due to the fact that the energy storage module cannot be normally charged when the charging loop is disconnected is avoided. In addition, the charging loop and the charging loop detection method provided by the invention have the advantages of lower cost and accurate detection result, and the reliability and safety of the whole energy storage system are improved.
Drawings
Fig. 1 is a schematic diagram of a charging circuit provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a voltage detection circuit of a charging circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a dummy load circuit of the charging circuit provided by the embodiment of the invention;
fig. 4 is a flowchart of a charging loop detection method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. The present invention is not limited to the embodiment, and structural, methodological, or functional changes made by one of ordinary skill in the art according to the embodiment are included in the scope of the present invention.
Fig. 1 is a schematic diagram of a charging circuit according to the present invention. The charging loop is used for charging the energy storage module when the energy storage module is in power shortage. The energy storage module is typically a rechargeable battery, such as a lead-acid battery, a nickel-metal hydride battery, a lithium ion battery, or the like.
The charging loop comprises a power conversion module, a control module, a voltage detection module, a dummy load module and an alarm device. The power conversion module can convert alternating current into direct current for charging the energy storage module; the voltage detection module is used for detecting voltage change in the charging loop; the dummy load module is used for accessing a load in the charging loop; the control module is usually a microprocessor, which controls the charging process or sends out warning information through an alarm device based on various detected parameters in the charging loop. Preferably, the control module uses TI's TMS320F28034 PNT.
Fig. 2 is a circuit diagram of a voltage detection circuit of a charging loop according to the present invention. The voltage detection circuit is composed of resistors R31, R24, R134, R128, and a differential operational amplifier U12-B. Preferably, the differential operational amplifier employs LM2904 MX. One end of the resistor R31 is connected with the negative electrode BAT-of the charging circuit, and the other end is connected with the inverting input end of the differential operational amplifier U12-B. One end of the resistor R24 is connected with the anode BAT + of the charging circuit, and the other end is connected with the positive input end of the differential operational amplifier U12-B. One end of the resistor R128 is connected with the inverting input end of the differential operational amplifier U12-B, and the other end is connected with the output end of the differential operational amplifier U12-B. One end of the resistor R134 is connected with the positive input end of the differential operational amplifier U12-B, and the other end is connected with the bias voltage with the voltage of 1.65V. The output of the differential operational amplifier U12-B is connected to the AD sampling port V-BAT of the microprocessor. The resistance of the resistor R24 is the same as the resistance of the resistor R31, and the resistance of the resistor R128 is the same as the resistance of the resistor R134. The relation between the voltage output to the AD sampling port of the microprocessor and the voltage VBAT of the charging loop is as follows: v _ BAT =1.65+ VBAT R134/R24.
Fig. 3 is a circuit diagram of a dummy load circuit of the charging circuit according to the present invention. The dummy load circuit is composed of resistors R87, R88, R89 and R92, a comparator U3A and a switch tube T4. Preferably, the comparator is LM239 DG. One end of the resistor R87 is connected with the +12V power supply, and the other end is connected with the inverting input end of the comparator U3A. One end of the resistor R88 is connected with the inverted input end of the comparator U3A, and the other end is connected with the battery cathode BAT-. One end of the resistor R89 is connected to the output end of the comparator U3A, and the other end is connected to the gate of the switch transistor T4. The positive input CTL of the comparator U3A is connected to the IO port of the microprocessor. The resistor R92 is a power resistor, one end of which is connected to the battery anode BAT +, and the other end is connected to the drain of the switch tube T4. The source of the switch transistor T4 is connected to the battery negative BAT-.
The output voltage of the charging loop is Uo, and the output maximum load current is Io. The relationship between the magnitude of the resistance of the resistor R92 and the output voltage Uo and the maximum load current Io is: UO/R92 > Io. When the energy storage module is charged by the charging loop, the microprocessor controls the switching tube T4 to be conducted at preset time intervals, and the power resistor R92 is loaded between the battery anode BAT + and the battery cathode BAT-. When the energy storage module is not properly connected to the charging loop, the voltage VBAT of the charging loop may drop significantly because the current Uo/R generated by the power resistor R92 is greater than the maximum load capacity Io of the charging loop. The microprocessor can judge that the charging loop is abnormal by detecting the change of the voltage. When the energy storage module is normally connected to the charging loop, and the power resistor R92 is loaded between the battery anode BAT + and the battery cathode BAT-, the current (Uo/R92-Io) exceeding the load capacity of the charging loop is supplemented by the energy of the energy storage module, and the voltage VBAT of the charging loop does not change obviously, so that the microprocessor can judge that the charging loop operates normally.
When the charging loop is abnormal, the microprocessor controls the alarm device to give an alarm. The alarm device comprises a relay and a warning device. The relay is used for controlling the work of the warning device, so that the warning device can generate the effect different from the normal state to warn. In the embodiment, the alarm device adopts a normally closed relay and an LED lamp, and when the charging loop normally operates, the LED lamp emits normal light; when the charging loop is abnormal, the microprocessor controls the relay to be switched off, and the LED lamp is turned off or is in a color different from the normal state to warn. Of course, it will be appreciated by those skilled in the art that other types of combinations of the alarm device may be selected, for example, the relay may be a normally open relay, and the relay may be closed only when an abnormality occurs in the charging circuit. The warning device can be a loudspeaker, and when the charging loop normally operates, the loudspeaker does not make a sound; when the charging loop is abnormal, the loudspeaker gives a warning by making a sound.
Referring to fig. 4, the method for detecting a charging loop provided by the present invention includes the following steps:
step S0: and starting the system. The charging circuit is energized through the input terminal.
Step S1: the charging loop voltage is detected. After the charging loop is started, the control module starts to work at first. The control module detects the voltage condition in the loop through the voltage detection module.
Step S2: and judging whether the detected loop voltage is abnormal or not. The control module compares the detected loop voltage with a preset standard value. If the energy storage module is correctly connected in the charging circuit, the voltage of the energy storage module can be detected in the charging circuit. The control module compares the detected voltage condition with a preset standard value to judge whether the detected voltage value is normal or not. If the detected voltage value is not in accordance with the preset standard value, for example, no battery voltage exists, or the detected voltage value is smaller than the preset voltage value, or the polarities are different, it is determined that the energy storage device is not correctly connected into the charging loop at the moment, and the control module controls the alarm device to send an alarm signal to inform a worker to process the alarm signal.
Step S3: charging is started. In step S2, it is determined that the detected loop voltage is not abnormal, and the control module sends an enable signal to operate the power conversion module, and outputs a normal charging voltage and current to charge the connected energy storage module.
Step S4: the dummy load is connected into the charging loop at regular time. After the charging is started, the control module sends a pulse signal with the duration of T to the dummy load circuit at regular time to the switching tube T4 to be conducted. Preferably, the control module sends a pulse signal with a duration of 5 milliseconds to the dummy load module every 10 seconds.
Step S5: and detecting and judging whether the voltage variation in the loop is normal or not. During the time that the dummy load is switched into the charging loop, the switching in of the dummy load causes the loop voltage to change. The control module detects the voltage variation during the dummy load access period and compares the detected voltage variation with a preset standard value. And if the variation is larger than a preset standard value, judging that the charging circuit has a fault, and sending an alarm to inform related personnel for processing. If the amount of change is smaller than the set criterion, it is determined that the charging circuit is normal, and the process returns to step S3, and thus the state of the charging circuit is continuously detected.
In summary, the charging circuit and the method for detecting the charging circuit provided by the invention can detect the condition of the charging circuit in the charging process, and when the charging circuit has a fault, such as a switch trip, a fuse, a poor contact of a connector, and the like, alarm information is sent out in time to inform relevant personnel of processing. In addition, the charging loop and the charging loop detection method provided by the invention have the advantages of lower cost and accurate detection result, and the reliability and safety of the whole energy storage system are improved.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. A charging loop detection method, wherein the charging loop is used for charging an energy storage module, and the charging loop detection method comprises the following steps:
a. detecting the voltage of an energy storage module in a charging loop through a voltage detection module;
b. the control module compares the detected voltage of the energy storage module with a preset value;
c. when the voltage of the energy storage module accords with the preset voltage value, starting charging; when the voltage of the energy storage module is not consistent with the preset voltage value, an alarm device gives an alarm;
the detection method of the charging loop also comprises the following steps that the control module accesses a dummy load in the charging loop according to a preset time interval; comparing the voltage variation value of the dummy load during the access period with a preset standard value; when the variation value of the voltage is smaller than the preset standard value, the charging loop operates normally; when the variation value of the voltage is larger than the preset standard value, the charging circuit has an abnormality.
2. The charging loop detection method of claim 1, wherein: and in the step b, comparing the detected voltage and polarity of the energy storage module with a preset value.
3. The charging loop detection method of claim 1, wherein: and when the charging loop is abnormal, an alarm is given out through an alarm device.
4. The charging loop detection method of claim 1, wherein: the preset time interval is 10 seconds.
5. The charging loop detection method of claim 1, wherein: the dummy load access duration is 5 milliseconds.
6. A charging circuit for charging an energy storage module, comprising:
the power conversion module converts alternating current into direct current for charging the energy storage module;
the voltage detection module is used for detecting the voltage in the charging loop;
the control module controls the charging loop to work in a preset mode;
the charging circuit is characterized by further comprising an alarm device and a dummy load module, wherein the control module is connected into the dummy load module in the charging circuit in a preset mode, detects the voltage change condition of the charging circuit during the connection of the dummy load module, and sends out alarm information through the alarm device when the voltage change is larger than a preset value.
7. The charging circuit of claim 6, wherein: the dummy load module comprises a power resistor, and the ratio of the output voltage Uo of the power conversion module to the resistance value R of the power resistor is larger than the maximum load current Io output by the power conversion module.
8. The charging circuit of claim 6, wherein: the alarm device comprises an LED lamp, and the LED lamp sends out light signals to warn.
9. The charging circuit of claim 6, wherein: the alarm device comprises a loudspeaker, and sound signals are sent out through the loudspeaker to warn.
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| CN109873473A (en) * | 2019-03-28 | 2019-06-11 | 维沃移动通信有限公司 | A kind of charging circuit and mobile terminal |
| KR20210097481A (en) * | 2020-01-30 | 2021-08-09 | 주식회사 엘지에너지솔루션 | Device and method for monitoring common mode voltage |
| CN111157831B (en) * | 2020-03-10 | 2021-02-05 | 浙江禾川科技股份有限公司 | Performance test method, device and equipment for power-on buffer resistor |
| CN116228205B (en) * | 2023-03-29 | 2023-11-21 | 东莞先知大数据有限公司 | Charging pile outage risk diagnosis method, device and storage medium |
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