CN104953701A - Isolation type battery power supply scheme - Google Patents
Isolation type battery power supply scheme Download PDFInfo
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- CN104953701A CN104953701A CN201510368593.1A CN201510368593A CN104953701A CN 104953701 A CN104953701 A CN 104953701A CN 201510368593 A CN201510368593 A CN 201510368593A CN 104953701 A CN104953701 A CN 104953701A
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Abstract
The invention provides an isolation type battery power supply scheme. A lithium battery, a resistor R1, a capacitor C1, a flyback isolation power supply chip, a transformer, an enable circuit, a clock power circuit and an alternating current mains supply circuit are adopted in the scheme. The scheme is characterized in that under the alternating current supply condition, the working voltage of the clock power circuit is provided by the alternating current mains supply circuit while the lithium battery only provides quiescent current for the flyback isolation power supply chip; under the alternating current outage condition, the lithium battery is used as a standby power supply by a system and provides the working voltage for the clock power circuit. Meanwhile, the power supply scheme has a lithium battery capacity detection function and sends out a battery replacement notice when the battery capacity is lower. With the adoption of the scheme, a lithium battery power supply system and a circuit of an alternating current mains supply system are isolated, that is, battery replacement electric shock hazards due to the fact that the battery power supply system is common-grounded with the alternating current mains supply system are avoided, and impact damage caused by direct connection of the battery with an MCU (micro controller unit) to MCU pins is also effectively avoided.
Description
Technical field
The present invention relates to electrical equipment technical field and integrated circuit (IC) design field, specifically refer to the isolated powered battery scheme of the one be applied in intelligent electric meter.
Background technology
According to national grid intelligent electric energy meter functional specification, intelligent electric meter adopts lithium battery as the stand-by power supply that there is situation clock circuit without alternating current, for providing the operating voltage of clock circuit, avoids the clock entanglement because clock circuit power down causes.As stand-by power supply when existing without electric main, how designing powered battery scheme has become important step in intelligent meter design process.
Powered battery scheme conventional in current intelligent electric meter has: non-isolated lithium battery power supply scheme, and namely lithium battery power supply circuit and clock circuit are all using electric main as publicly; Isolation lithium battery power supply scheme, namely lithium battery power supply circuit and clock circuit adopt independent ground wire respectively, realize the isolation with electric main.Above-mentioned two kinds of lithium battery power supply schemes, equal Shortcomings part.The shortcoming of non-isolated lithium battery power supply scheme is, the operation changing battery is exposed in forceful electric power environment completely, add Danger Electric shock risk when changing battery, simultaneously because battery is directly for MCU powers, adds and change the battery-operated electrostatic impact risk to MCU pin brought.Isolation lithium battery power supply scheme, although avoid Danger Electric shock risk when changing battery, because lithium battery is still directly for MCU powers, still exists and operates because changing battery etc. the electrostatic impact risk to MCU pin brought.
Summary of the invention
For solving Problems existing in existing intelligent electric meter powered battery scheme, the invention provides a kind of isolated powered battery scheme.This isolated powered battery scheme, not only achieves the isolation of lithium battery power supply circuit and clock circuit ground wire, avoids the Danger Electric shock risk that may exist in battery altering process; And avoid battery and be communicated with the direct of MCU pin, eliminate and operate because changing battery etc. the electrostatic impact risk to MCU pin brought.
The isolated powered battery scheme of one of the present invention, it is characterized in that, described isolated powered battery scheme comprises a lithium battery, a resistance R1, a capacitor C1, a flyback insulating power supply chip, a transformer, an enable circuits, a clock supply circuit and an AC mains circuit.Wherein,
Described lithium battery, as the stand-by power supply of intelligent electric meter clock circuit when existing without alternating current, for providing the operating voltage of clock circuit, avoids the clock entanglement because clock circuit power down causes.
The first input end of described flyback insulating power supply chip is connected with lithium battery anode VCC, as chip power input; Second input is connected by resistance R1 and VCC, and producing size for battery electric quantity testing process is the pull-down current of I; 3rd input is connected by capacitor C1 and GND1, for generation of patrolling and examining signal; Four-input terminal is connected with cathode of lithium battery GND1, and as chip ground wire input, output is connected to lithium battery anode VCC by transformer main coil L1.
Described transformer main coil L1 two ends are connected to lithium battery anode VCC and flyback isolating chip output respectively, secondary coil L2 two ends are connected to clock supply circuit first input end and ground wire GND2 respectively, for completing the energy transferring of lithium battery to clock supply circuit.
Described enable circuits is connected between clock supply circuit first input end and ground wire GND2, for opening the battery electric quantity measuring ability of lithium battery power supply system.
Described clock supply circuit first input end is connected with transformer, and the second input is connected with AC mains circuit, and output voltage VO is as the power supply of clock circuit; Under electric main exists situation, this clock supply circuit exports VDD for power supply with AC mains circuit, provides clock circuit operating voltage VO; Under electric main powering-off state, this clock supply circuit is stand-by power supply with lithium battery, provides clock circuit operating voltage VO.
Described AC mains circuit, using electric main as power supply, exports as voltage VDD, and under electric main exists situation, output voltage VDD provides operating voltage for clock supply circuit.
The isolated powered battery scheme of described one, is characterized in that, flyback insulating power supply chip is low speed paper tape reader static power disspation power supply chip, greatly reduces the electric quantity of lithium battery loss that flyback insulating power supply chip self brings.
Operation principle of the present invention is as follows:
1, electric main powering-off state
Under electric main powering-off state, the operating voltage of clock supply circuit is provided by lithium battery.Under flyback insulating power supply chip controls, lithium battery is the process that clock supply circuit is powered in the form of a pulse continuously, is defined as charge mode; Lithium battery terminates as the process that clock supply circuit is powered, and is defined as standby mode.In charge mode, under flyback insulating power supply chip controls the break-make of transformer, electric power system completes the transfer of lithium battery energy to clock supply circuit, and voltage VO increases gradually.And, in charge mode, the size of flyback insulating power supply chip moment to voltage VO detects: if voltage VO < V1 detected, then lithium battery power supply system keeps charge mode, continue clock supply circuit charging, voltage VO continues to raise; If clock power VO > V1 detected, then lithium battery power supply system finishing charge mode, system enters standby mode, and voltage VO starts to reduce.In standby mode, lithium battery terminates as clock supply circuit and powers, and voltage VO reduces gradually.And, in standby mode, flyback insulating power supply chip carries out timing to voltage VO size and patrols and examines, and detects the size of clock voltage VO in time: if clock voltage VO > V2 detected, then lithium battery power supply system keeps standby mode, and voltage VO continues to lower; If power supply VO < V2 detected, lithium battery power supply system finishing charge mode, system enters charge mode, and voltage VO starts to raise.By the audit function of flyback isolating chip to clock voltage VO size, lithium battery power supply system switches back and forth between charge mode and standby mode, under completing electric main powering-off state, the energy content of battery, to the transmission of clock supply circuit, avoids the clock entanglement because the power down of clock supply circuit output voltage VO causes.
Threshold voltage V1 is clock power Typical operating voltages; Threshold voltage V2 meets lower than clock power Typical operating voltages, and is greater than the minimum power supply voltage, that clock circuit normally works.This two threshold voltages magnitude relationship is V2 < V1.
2, electric main electric power thus supplied is had
Under having electric main electric power thus supplied, clock supply circuit operating voltage is provided by AC mains circuit VDD, and lithium battery power supply system is in standby mode.In standby mode, what produced by flyback insulating power supply chip and capacitor C1 patrols and examines signal, lithium battery power supply timing opens inspection function, namely by the regular check of open system to voltage VO, know the size of voltage VO in time, avoid because electric main interrupts, because lithium battery can not participate in powering the clock entanglement causing voltage VO power down to cause in time.Meanwhile, in standby mode, lithium battery mainly provides the static working current of flyback insulating power supply chip.The design of low speed paper tape reader static power disspation power supply chip, reduces the loss of chip to electric quantity of lithium battery, extends the useful life of lithium battery.
3, electric quantity of lithium battery measuring ability
When lithium battery is in electric quantity consumption edge, its internal resistance can significantly increase.According to this characteristic, enable circuits timing is enable opens once, starts lithium battery power supply system battery electric quantity detection function.After battery electric quantity measuring ability is opened, flyback insulating power supply chip is discharged with electric current I to lithium battery by resistance R1, and the size of lithium battery output voltage VCC under detecting this discharge level, the situation of change of the internal resistance of cell is known with this.By the above-mentioned detection to lithium battery internal resistance situation of change, whether acquisition lithium battery is in electricity exhausts edge.This battery electric quantity testing process, if record cell voltage VCC > V4, then thinks that battery electric quantity is sufficient; If record cell voltage VCC < V4, then think that battery electric quantity is in and exhaust edge, now system output alarm signal, and send dead battery capability notice by intelligent electric meter, notice need change battery.
Threshold voltage V4 is the output voltage that the dead battery capability edge selected according to lithium battery characteristic is corresponding.
This flyback isolation powered battery scheme, achieves the isolation of battery feed circuit and clock circuit ground wire, avoids the Danger Electric shock risk that may exist in battery altering process; Avoid battery to be communicated with the direct of MCU pin simultaneously, eliminate and change the battery-operated electrostatic impact risk to MCU pin brought.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is a kind of isolated powered battery scheme.
Fig. 2 is the schematic diagram of one embodiment of the invention.
Fig. 3 is flyback isolating chip structural representation in the present invention.
Fig. 4 is standby mode of the present invention and charge mode switching controls flow graph.
Embodiment
Clearly understand for making the object, technical solutions and advantages of the present invention, below in conjunction with embodiment of the present invention accompanying drawing, description clear, complete is further done to the technical scheme in the embodiment of the present invention, obviously, described embodiment is the one of the embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 2, be the present invention one embodiment schematic diagram.Lithium battery 1 positive pole VCC is as the power end of transformer 5 main coil lateral circuit, and negative pole GND1 is as the ground terminal of transformer 5 main coil lateral circuit.The first input end of flyback isolating chip 4 is connected with the positive pole VCC of lithium battery 1, and this input is the power input of flyback isolating chip 4; Second input is connected with lithium battery 1 positive pole VCC by resistance 2, and in battery electric quantity testing process, this input coordinates resistance 2 to produce constant pull-down current I; 3rd input is connected with the negative pole GND1 of lithium battery 1, for generation of patrolling and examining clock signal by the first capacitor 3; Four-input terminal is connected with the negative pole GND1 of lithium battery, as the ground terminal of flyback isolating chip 4; The output SW of flyback isolating chip 4 is connected with the positive pole VCC of lithium battery 1 by the main coil 6 of transformer 5.One end SW1 of the secondary coil 7 of transformer 5 is connected with the 3rd diode 9 positive pole with the first diode 8 respectively; The other end of the secondary coil 7 of transformer 5 is connected with ground wire GND2, and ground wire GND2 is as transformer 5 secondary coil lateral circuit ground terminal.First diode 8, second diode 12 forms clock supply circuit together with the second capacitor 10, and wherein the positive pole of the first diode 8 is held with transformer SW1 and is connected; Negative pole is connected with GND2 by the second capacitor 10; The positive pole of the second diode 12 is connected with AC mains circuit output end VDD; Negative pole is connected to the common port of the first diode 8 and the second capacitor 10; Second capacitor 10 both end voltage VO is the output voltage of clock supply circuit, and this voltage is the supply voltage of clock circuit.AC mains circuit 13 is connected to the second capacitor 10 two ends by the second diode 12, under alternating current exists situation, provides the operating voltage of clock supply circuit.The negative pole of the 3rd diode 9 is connected with the drain terminal of NMOS tube 11, and the source of NMOS tube 11 is connected with ground wire GND2; The grid end of NMOS tube 11 is connected with control signal CTR, signal CTR control under, the 3rd diode 9 together with NMOS tube 11 as the enable circuits of lithium battery power supply system battery electric quantity detection function.
Before carrying out system work process description, first illustrate that control signal CTR is always low level in without specified otherwise situation, the SW1 that namely the 3rd diode 9 and NMOS tube 11 form enable circuits holds GND2 path to be in off-state all the time.
1, during electric main power-off, the course of work is as follows
Due to electric main power-off, AC mains circuit 13 cannot provide operating voltage for clock supply circuit because of the supply voltage lost needed for self work.Now for ensureing the normal operation of clock circuit, lithium battery 1 starts to work as stand-by power supply.Due to electric main exist time, lithium battery power supply system is in standby mode, electric main disconnect after, along with the operation of clock circuit, the both end voltage VO of the second capacitor 10 reduces gradually.In this process, the signal timing of patrolling and examining produced by flyback insulating power supply chip 4 and the first capacitor 3 is triggered lithium battery power supply system and enters charge mode.In charge mode, flyback insulating power supply chip 4 take cycle as the break-make of main coil 6 in the switching signal control transformer 5 of T: main coil 6 conducting phase, according to reversed nature and the diode reverse cut-off characteristics of transformer 5, now secondary coil 7 is in off-state, this process completes the storage of lithium battery 1 energy to transformer 5, is designated as normal shock process; Main coil 6 disconnected phase, can not the forward conduction characteristic of catastrophe characteristics and the first diode 8 according to inductive current, now secondary coil 7 is that the second capacitor 10 charges by the first diode 8, is designated as flyback process.In flyback process, flyback voltage SW includes the size information of voltage VO.Therefore, the size by detecting this process voltage SW can know the size information of voltage VO.In standby mode, trigger lithium battery power supply system force the course of work after entering charge mode to be by patrolling and examining signal, the flyback cycle, by the detection of counterattack insulating power supply chip 4 couples of voltage SW, know the size information of clock voltage VO: as VO > V2, flyback insulating power supply chip 4 controls lithium battery power supply system finishing charge mode, and lithium battery power supply system continues to keep standby mode; As VO < V2, flyback insulating power supply chip 4 controls lithium battery power supply system finishing standby mode, and lithium battery power supply system enters charge mode.In charge mode, flyback insulating power supply chip 4 is that the switching signal control lithium battery 1 of T continues to charge to the second capacitor 10 with cycle, voltage VO rises gradually, and in each flyback cycle, flyback insulating power supply chip 4 all can detect to voltage SW size the size information knowing voltage VO: as VO < V1, and flyback insulating power supply chip 4 controls lithium battery power supply system and keeps charge mode; As VO > V1, flyback insulating power supply chip 4 controls lithium battery power supply system finishing charge mode, and lithium battery power supply system enters standby mode.Under electric main powering-off state, by the detection of flyback insulating power supply chip 4 couples of voltage VO, control lithium battery power supply system and switch back and forth between standby mode and charge mode, and then complete lithium battery as stand-by power supply providing clock supply circuit energy.The whole course of work.Under ignoring the overshoot condition of testing process voltage VO, voltage VO meets: V2 < VO < V1.
Threshold voltage V1 is clock power Typical operating voltages; Threshold voltage V2 meets lower than clock power Typical operating voltages, and is greater than the minimum power supply voltage, that clock circuit normally works.This two threshold voltages magnitude relationship is V2 < V1.
2, when electric main exists, the course of work is as follows
When electric main exists, the operating voltage of clock supply circuit is provided by AC mains circuit 13.Under this power supply environment, due to each polling period, flyback insulating power supply chip 4 all can detect power supply VO > V2, and therefore lithium battery power supply system is in standby mode all the time.Now, lithium battery 1 mainly provides the static working current of flyback insulating power supply chip 4.Flyback insulating power supply chip 4 is low speed paper tape reader static power disspation power supply chip, reduces lithium battery power supply system self to the loss of electric quantity of lithium battery, extends the useful life of lithium battery.Meanwhile, in standby mode, the design of inspection function avoids because electric main interrupts, and causes voltage VO power down and the clock entanglement that causes because lithium battery 1 can not participate in powering in time.
3, electric quantity of lithium battery measuring ability
When lithium battery 1 is in electric quantity consumption edge, its internal resistance can significantly increase.According to this characteristic, timing closes NMOS tube 11 by control signal CTR, and by the 3rd diode 9 force drag down SW1 terminal voltage patrol and examine pulse arrive time, due to the 3rd diode 9 and the strong pull-down effect of NMOS tube 11, flyback insulating power supply chip 4 can detect voltage VO < V3.The magnitude relationship of voltage V1, V2 and V3 is, V1 > V2 > V3, therefore using enable information that VO < V3 detects as battery electric quantity.Battery electric quantity detect enable after, 4, flyback insulating power supply core is discharged with electric current I by resistance 2 to lithium battery 1, and the size of lithium battery 1 output voltage VCC under detecting this discharge level, learns the situation of change of lithium battery 1 internal resistance with this.By the above-mentioned description to lithium battery 1 inner resistance and internal resistance detection method, in battery electric quantity testing process, if record the output voltage VCC > V4 of lithium battery 1, then think that battery electric quantity is sufficient; If record the output voltage VCC < V4 of lithium battery 1, then think that battery electric quantity is in and exhaust edge, now system exports under-voltage signal, and is sent because dead battery capability need change the notice of battery by intelligent electric meter.
Fig. 3 is flyback insulating power supply chip 4 structural representation.As shown in the figure, in flyback insulating power supply chip, reference circuit 14 is as the base modules of whole chip, for each module of chip provides reference voltage needed for work and reference current.The first input end of battery detection circuit 15 is as chip pin TR; Second input is connected with reference circuit 14 first output; 3rd input is connected with flyback testing circuit 17 second output OC, for opening battery electric quantity measuring ability; First output OA is connected with pierce circuit 16 second input, electric quantity of lithium battery testing process, if dead battery capability information detected, then changed the operating frequency of pierce circuit 16 by this output end signal, and the criterion whether exhausted using this frequency change as electricity.Pierce circuit 16 first input end is connected with the second output of reference circuit 14; 3rd input is connected with the first output OB of flyback testing circuit 17, for the detection according to flyback testing circuit 17 pairs of voltage VO sizes, controls lithium battery power supply system and switches between standby mode and charge mode; First output is connected with output logic circuit 19 first input end, output switching signal OSC, as switching signal during system works.Flyback testing circuit 17 first input end is connected with reference circuit 14 the 3rd output; Second input is connected with the output of patrolling and examining clock circuit 18, realizes the inspection function of lithium battery power supply system under standby mode; 3rd input is connected with chip pin SW; Second output OC is connected with battery detection circuit 15 the 3rd input, as the enable signal of battery detection circuit 15, controls battery detection circuit 15 and whether starts battery detecting function.4th output of the first input end and reference circuit 14 of patrolling and examining clock circuit 18 is connected; Second input is as chip pin TIM; Output OD is connected with flyback testing circuit 17 second input, realizes the inspection function of lithium battery power supply system under standby mode.Flyback insulating power supply chip 4 as the control chip of lithium battery power supply system, switching signal when producing electric power system charge mode by pierce circuit 16; By battery detection circuit 15, complete the inspection of battery electric quantity, and the criterion whether switching frequency outputed signal by changing pierce circuit 16 exhausts as electricity; Detected the size of voltage VO by flyback testing circuit 17, determine the charge mode of electric power system, and determine whether to need to open battery electric quantity measuring ability; Control timing when electric power system is in standby mode detect the size of patrolling and examining voltage VO by patrolling and examining clock circuit 18, avoid because electric main interrupts, cause voltage VO power down and the clock entanglement that causes because lithium battery 1 can not participate in powering in time.
Fig. 4 is standby mode of the present invention and charge mode switching controls flow graph.Signal VO is clock circuit operating voltage; Signal V1 and V2 is the threshold voltage differentiating clock voltage VO size; The switching signal that signal OSC pierce circuit 16 produces, this signal is as the switching signal of lithium battery power supply system under charge mode; Signal OD be patrol and examine clock circuit 18 export patrol and examine signal; Signal OB is the output signal of flyback testing circuit 17, and this signal reflects the size of voltage VO.As shown in the figure, in charge mode, because flyback testing circuit 17 detects voltage VO < V1, signal OB maintenance low level now oscillator exports continuous switching signal, and complete the transmission of lithium battery energy to electric capacity 10, output voltage raises gradually; Along with the rising of output voltage, in the t1 moment, when flyback testing circuit 17 detects clock voltage VO > V1, now signal OB becomes high level, the switching signal of closing in pierce circuit exports, and lithium battery power supply system enters standby mode.In standby mode, along with the power consumption of clock circuit, voltage VO reduces gradually, the t2 moment patrols and examines signal OD and produces, and forced oscillation device circuit 16 exports a switching signal, switching signal flyback testing circuit 17 completes the detection to voltage VO whereby, and now owing to VO > V2 being detected, lithium battery power supply system keeps standby mode; After multiple polling period, t3 moment flyback testing circuit 17 detects VO < V2, and lithium battery power supply system finishing standby mode, circuit enters charge mode.And so forth, without electric main electric power thus supplied, by detecting the size of voltage VO, controlling lithium battery power supply system and switching back and forth between standby mode and charge mode, and then completing lithium battery as stand-by power supply providing clock circuit energy.
In sum, a kind of isolated powered battery scheme provided by the invention not only achieves the isolation of battery feed circuit and clock circuit ground wire, avoids the Danger Electric shock risk that may exist in battery altering process; And avoid the connecting path of battery and MCU pin, eliminate and change the battery-operated electrostatic impact risk to MCU pin brought.
Finally it should be noted that, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that; It still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (2)
1. an isolated powered battery scheme, it is characterized in that, described isolated powered battery scheme comprises a lithium battery, a resistance R1, a capacitor C1, a flyback insulating power supply chip, a transformer, an enable circuits, clock supply circuit and an AC mains circuit.Wherein,
Described lithium battery, as the stand-by power supply of intelligent electric meter clock circuit when existing without electric main, for providing the operating voltage of clock circuit, avoids the clock entanglement because clock circuit power down causes;
The first input end lithium battery anode VCC of described flyback insulating power supply chip is connected, as chip power input; Second input is connected by resistance R1 and VCC, and producing size for battery electric quantity testing process is the pull-down current of I; 3rd input is connected by capacitor C1 and GND1, for generation of patrolling and examining signal; Four-input terminal is connected with GND1, and as chip ground wire input, output is connected to lithium battery anode VCC by transformer main coil L1;
Described transformer main coil L1 two ends are connected to positive pole VCC and the flyback isolating chip output of lithium battery respectively, transformer secondary coil L2 two ends are connected to clock supply circuit first input end and positive input terminal and ground wire GND2 respectively, for completing the energy transferring of lithium battery to clock supply circuit;
Described enable circuits is connected between clock supply circuit first input end and ground wire GND2, for opening the battery electric quantity measuring ability of lithium battery power supply system;
Described clock supply circuit first input end is connected with transformer, and the second input is connected with AC mains circuit, and output voltage VO is as the power supply of clock circuit; Under electric main exists situation, this clock supply circuit exports VDD for power supply with AC mains circuit, provides clock circuit operating voltage VO; Under electric main powering-off state, this clock supply circuit is stand-by power supply power supply with lithium battery, provides clock circuit operating voltage VO;
Described AC mains circuit is the low-tension supply produced using electric main as power supply, under electric main exists situation, provides the operating voltage of clock supply circuit.
2. a kind of isolated powered battery scheme as claimed in claim 1, it is characterized in that, flyback insulating power supply chip is low speed paper tape reader static power disspation power supply chip, greatly reduces the electric quantity of lithium battery loss that flyback insulating power supply chip self brings.
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| CN106644143A (en) * | 2016-11-15 | 2017-05-10 | 国网河南省电力公司漯河供电公司 | Power source system of single-phase intelligent electricity meter |
| CN109802152A (en) * | 2019-02-20 | 2019-05-24 | 广西睿奕新能源股份有限公司 | Monitor the circuit structure of lithium disposable battery capacity |
| CN110932559A (en) * | 2019-12-03 | 2020-03-27 | 成都长城开发科技有限公司 | Power module of ammeter |
| CN112217273A (en) * | 2019-12-30 | 2021-01-12 | 蜂巢能源科技有限公司 | Monitoring method and monitoring device for battery management system |
| CN116707121A (en) * | 2023-08-10 | 2023-09-05 | 青岛鼎信通讯股份有限公司 | Electric energy meter clock nursing method, device and medium |
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| CN116707121B (en) * | 2023-08-10 | 2023-11-14 | 青岛鼎信通讯股份有限公司 | Electric energy meter clock nursing method, device and medium |
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