CN104953701B - A kind of isolated battery powdered device - Google Patents
A kind of isolated battery powdered device Download PDFInfo
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- CN104953701B CN104953701B CN201510368593.1A CN201510368593A CN104953701B CN 104953701 B CN104953701 B CN 104953701B CN 201510368593 A CN201510368593 A CN 201510368593A CN 104953701 B CN104953701 B CN 104953701B
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Abstract
The invention provides a kind of isolated battery powdered device, including a lithium battery, a resistance R1, a capacitor C1, a flyback insulating power supply chip, a transformer, an enable circuit, a clock supply circuit and an AC mains circuit.Characterized in that, in the case of AC-powered, clock supply circuit operating voltage is provided by AC mains circuit, lithium battery only provides flyback insulating power supply chip inspection operating current；Under AC-powered powering-off state, system provides operating voltage using lithium battery as stand-by power supply for clock supply circuit.Meanwhile, the electric supply installation has the function of detection electric quantity of lithium battery, and sends when battery electric quantity is relatively low replacing battery and notify.Isolate the arrangement achieves lithium battery power supply system with the circuit of electric main electric power system, avoid because battery power supply system and electric main electric power system altogether caused by change battery Danger Electric shock risk, also effectively prevent the impact damage to MCU pin caused by battery is directly connected with MCU.
Description
Technical field
The present invention relates to electrical equipment technical field and IC design field, specifically refer to be applied in intelligent electric meter
A kind of isolated battery powdered device.
Background technology
According to national grid intelligent electric energy meter functional specification, there is situation in intelligent electric meter using lithium battery as without alternating current
The stand-by power supply of clock circuit, the operating voltage for providing clock circuit, it is to avoid clock is wrong caused by clock circuit power down
Disorderly.Turn into intelligent meter design process as without the stand-by power supply in the presence of electric main, how to design battery powdered device
Important step.
The battery powdered device commonly used in current intelligent electric meter has：Non-isolated lithium battery power supply device, i.e. lithium battery power supply
Circuit is with clock circuit using electric main as publicly；Isolate lithium battery power supply device, i.e. lithium battery power supply circuit and when
Independent ground wire is respectively adopted in clock circuit, and realization is isolated with electric main.Above two lithium battery power supply device, equal Shortcomings
Part.Non-isolated lithium battery power supply device the disadvantage is that, change battery operation be fully exposed in forceful electric power environment, add
Change Danger Electric shock risk during battery, simultaneously because battery is directly powered for MCU, add change that battery operation brings to MCU
The electrostatic impact risk of pin.Isolate lithium battery power supply device, although avoid Danger Electric shock risk when changing battery, but due to lithium
Battery is still directly powered for MCU, is still existed because changing the electrostatic impact risk to MCU pin that the operation such as battery is brought.
The content of the invention
To solve problem present in existing intelligent electric meter battery powdered device, the invention provides a kind of isolated battery
Electric supply installation.The isolated battery powdered device, not only realizes isolating for lithium battery power supply circuit and clock circuit ground wire, keeps away
Danger Electric shock risk that may be present during battery altering is exempted from；And avoid battery and connected with the direct of MCU pin, eliminate
Because changing the electrostatic impact risk to MCU pin that the operation such as battery is brought.
A kind of isolated battery powdered device of the present invention, it is characterised in that the isolated battery powdered device
Circuit, a period of time are enabled including a lithium battery, a resistance R1, a capacitor C1, a flyback insulating power supply chip, a transformer, one
Clock power circuit and an AC mains circuit, wherein,
The lithium battery is as the stand-by power supply without intelligent electric meter clock circuit in the presence of alternating current, for providing clock electricity
The operating voltage on road, it is to avoid the clock entanglement caused by clock circuit power down.
The first input end of the flyback insulating power supply chip is connected with lithium battery anode VCC, defeated as chip power
Enter end；Second input is connected by resistance R1 with VCC, and drop-down electricity of the size for I is produced for battery electric quantity detection process
Stream；3rd input is connected by capacitor C1 with GND1, for producing inspection signal；4th input and cathode of lithium battery
GND1 is connected, as chip ground wire input, and output end is connected to lithium battery anode VCC by transformer main coil L1.
The transformer main coil L1 two ends are respectively connecting to lithium battery anode VCC and flyback isolating chip output end, secondary
Coil L2 two ends are respectively connecting to clock supply circuit first input end and ground wire GND2, for completing lithium battery to clock power
The energy transmission of circuit.
The enable circuit is connected between clock supply circuit first input end and ground wire GND2, for opening lithium battery
The battery electric quantity detection function of electric power system.
The clock supply circuit first input end is connected with transformer, the second input and AC mains circuit
Be connected, output voltage VO as clock circuit power supply；In the case of electric main is present, the clock supply circuit is to hand over
It is that there is provided clock circuit operating voltage VO for power supply to flow mains circuit output VDD；Under electric main powering-off state, the clock
There is provided clock circuit operating voltage VO by stand-by power supply of lithium battery for power circuit.
The AC mains circuit is output as voltage VDD, deposited in electric main using electric main as power supply
In the case of, output voltage VDD provide operating voltage for clock supply circuit.
Described a kind of isolated battery powdered device, it is characterised in that flyback insulating power supply chip is low speed paper tape reader static power disspation
The electric quantity of lithium battery loss that power supply chip, greatly reduction flyback insulating power supply chip itself are brought.
The operation principle of the present invention is as follows：
1st, electric main powering-off state
Under electric main powering-off state, the operating voltage of clock supply circuit is provided by lithium battery.In flyback insulating power supply
Under chip controls, the process that lithium battery is continuously powered for clock supply circuit in the form of a pulse is defined as charge mode；Lithium electricity
Pond terminates as the process that clock supply circuit is powered, and is defined as standby mode.In charge mode, in flyback insulating power supply chip pair
Under the break-make control of transformer, electric power system completes lithium battery energy to the transfer of clock supply circuit, and voltage VO gradually increases
Greatly.Also, in charge mode, the flyback insulating power supply chip moment is detected to voltage VO size：If detecting voltage VO
＜ V1, then lithium battery power supply system holding charge mode, persistently charges to clock supply circuit, and voltage VO continues to raise；If inspection
Clock power VO ＞ V1 are measured, then lithium battery power supply system finishing charge mode, system enters standby mode, voltage VO starts drop
It is low.In standby mode, lithium battery terminates as clock supply circuit and powered, and voltage VO is gradually reduced.Also, in standby mode, instead
Swash insulating power supply chip and inspection is timed to voltage VO sizes, in time detection clock voltage VO size：If detecting clock
Voltage VO ＞ V2, then lithium battery power supply system keep standby mode, voltage VO continue lower；If detecting power supply VO ＜ V2, lithium
Battery power supply system complete charge pattern, system enters charge mode, and voltage VO starts rise.During by flyback isolating chip pair
The audit function of clock voltage VO sizes, lithium battery power supply system is toggled between charge mode and standby mode, completes to hand over
Flow under civil power powering-off state, the transmission of the energy content of battery to clock supply circuit, it is to avoid because clock supply circuit output voltage VO is fallen
Clock entanglement caused by electric.
Threshold voltage V1 is clock power Typical operating voltages；Threshold voltage V2 is met less than clock power exemplary operation electricity
Pressure, and more than the minimum power supply voltage, of clock circuit normal work.The two threshold voltages magnitude relationship is V2 ＜ V1.
2nd, there is electric main electric power thus supplied
Have under electric main electric power thus supplied, clock supply circuit operating voltage is provided by AC mains circuit VDD, lithium
Battery power supply system is in standby mode.In standby mode, the inspection produced by flyback insulating power supply chip and capacitor C1
Signal, lithium battery power supply timing opens inspection function, the i.e. regular check by open system to voltage VO, knows in time
Voltage VO size, it is to avoid because electric main is interrupted, cause voltage VO power down to cause because lithium battery can not participate in power supply in time
Clock entanglement.Meanwhile, in standby mode, lithium battery mainly provides the static working current of flyback insulating power supply chip.It is low
The design of quiescent dissipation power supply chip, reduces loss of the chip to electric quantity of lithium battery, extends the service life of lithium battery.
3rd, electric quantity of lithium battery detection function
When lithium battery is in electric quantity consumption edge, its internal resistance can be dramatically increased.According to this characteristic, enabling circuit timing makes
It can open once, start lithium battery power supply system battery electric quantity detection function.After battery electric quantity detection function is opened, flyback isolation electricity
Source chip is discharged lithium battery by resistance R1 with electric current I, and detects lithium battery output voltage VCC under the discharge level
Size, 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, lithium battery is obtained
Whether edge is exhausted in electricity.The battery electric quantity detection process, if measuring cell voltage VCC ＞ V4, then it is assumed that battery electric quantity
It is sufficient；If measuring cell voltage VCC ＜ V4, then it is assumed that battery electric quantity, which is in, exhausts edge, now system output alarm signal, and
Dead battery capability is sent by intelligent electric meter to notify, notice need to change battery.
Threshold voltage V4 is the corresponding output voltage in dead battery capability edge selected according to lithium battery characteristic.
The flyback isolates battery powdered device, realizes isolating for battery feed circuit and clock circuit ground wire, it is to avoid
Danger Electric shock risk that may be present during battery altering；Avoid battery simultaneously to connect with the direct of MCU pin, eliminate replacing
The electrostatic impact risk to MCU pin that battery operation is brought.
Brief description of the drawings
In order to illustrate more clearly the embodiments of the present invention or technique device of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without having to pay creative labor, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.In the accompanying drawings：
Fig. 1 is a kind of isolated battery powdered device.
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 control flow graph.
Embodiment
For the purpose of the present invention, technical method and advantage is more clearly understood, with reference to embodiment of the present invention accompanying drawing,
Further clear, complete description is done to the technique device in the embodiment of the present invention, it is clear that described embodiment is the present invention
One kind of embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, the scope of protection of the invention is belonged to.
As shown in Fig. 2 being embodiment schematic diagram of the invention.The positive pole VCC of lithium battery 1 is used as the main coil side of transformer 5
The power end of circuit, negative pole GND1 as the main coil lateral circuit of transformer 5 ground terminal.First input of flyback isolating chip 4
End is connected with the positive pole VCC of lithium battery 1, and the input is the power input of flyback isolating chip 4；Second input passes through
Resistance 2 is connected with the positive pole VCC of lithium battery 1, and the input coordinates resistance 2 to produce constant drop-down electricity in battery electric quantity detection process
Flow I；3rd input is connected by the first capacitor 3 with the negative pole GND1 of lithium battery 1, for producing inspection clock signal；
4th input is connected with the negative pole GND1 of lithium battery, is used as the ground terminal of flyback isolating chip 4；Flyback isolating chip 4
Output end SW is connected by the main coil 6 of transformer 5 with the positive pole VCC of lithium battery 1.One end of the secondary coil 7 of transformer 5
SW1 is connected with the first diode 8 and the positive pole of the 3rd diode 9 respectively；The other end and ground wire of the secondary coil 7 of transformer 5
GND2 is connected, and ground wire GND2 is used as the secondary coil lateral circuit ground terminal of transformer 5.First diode 8, the second diode 12 and
Two capacitors 10 constitute clock supply circuit together, wherein the positive pole of the first diode 8 is connected with transformer SW1 ends；Negative pole
It is connected by the second capacitor 10 with GND2；The positive pole of second diode 12 and AC mains circuit output end VDD phases
Connection；Negative pole is connected to the common port of the first diode 8 and the second capacitor 10；When the both end voltage VO of second capacitor 10 is
The output voltage of clock power circuit, the voltage is the supply voltage of clock circuit.AC mains circuit 13 passes through the two or two
Pole pipe 12 is connected to the two ends of the second capacitor 10, and there is provided the operating voltage of clock supply circuit in the case of alternating current presence.The
The negative pole of three diodes 9 is connected with the drain terminal of NMOS tube 11, and the source of NMOS tube 11 is connected with ground wire GND2；NMOS tube 11
Grid end be connected with control signal CTR, under signal CTR controls, the 3rd diode 9 is with NMOS tube 11 together as lithium battery
Electric power system battery electric quantity detects the enable circuit of function.
Carry out before system work process description, illustrate that control signal CTR is always in the case of without specified otherwise first
The SW1 ends that low level, i.e. the 3rd diode 9 constitute enable circuit with NMOS tube 11 are off all the time to GND2 paths.
1st, the course of work is as follows when electric main is powered off
Due to electric main power-off, AC mains circuit 13 can not because of the supply voltage needed for losing itself work
Operating voltage is provided for clock supply circuit.It is now the normal operation of guarantee clock circuit, lithium battery 1 is opened as stand-by power supply
Beginning works.In the presence of electric main, lithium battery power supply system be in standby mode, electric main disconnect after, with when
The operation of clock circuit, the both end voltage VO of the second capacitor 10 is gradually reduced.During being somebody's turn to do, pass through flyback insulating power supply chip 4
The inspection signal timing triggering lithium battery power supply system produced with the first capacitor 3 enters charge mode.In charge mode, flyback
The break-make of main coil 6 in switching signal control transformer 5 of the insulating power supply chip 4 using the cycle as T：The conducting phase of main coil 6, root
According to reversed nature and the diode reverse cut-off characteristics of transformer 5, now secondary coil 7 is off, and the process completes lithium
The energy of battery 1 is designated as normal shock process to the storage of transformer 5；The disconnected phase of main coil 6, spy can not be mutated according to inductive current
Property with the forward conduction characteristic of the first diode 8, now secondary coil 7 charged by the first diode 8 for the second capacitor 10, note
For flyback process.During flyback, flyback voltage SW includes voltage VO size information.Therefore, by detecting process electricity
The size for pressing SW is the size information that would know that voltage VO.In standby mode, lithium battery power supply system is triggered by inspection signal strong
The course of work that system enters after charge mode is in the flyback cycle, by strikeing back detection of the insulating power supply chip 4 to voltage SW, to obtain
Know clock voltage VO size information：As VO ＞ V2, the control lithium battery power supply system finishing charging of flyback insulating power supply chip 4
Pattern, lithium battery power supply system continues to keep standby mode；As VO ＜ V2, the control lithium battery of flyback insulating power supply chip 4 is supplied
Electric system terminates standby mode, and lithium battery power supply system enters charge mode.In charge mode, flyback insulating power supply chip 4 with
Cycle is persistently charged for T switching signal control lithium battery 1 to the second capacitor 10, and voltage VO is gradually increasing, and each
Flyback cycle, flyback insulating power supply chip 4 all can be detected to know voltage VO size information to voltage SW sizes：Work as VO
During ＜ V1, the control lithium battery power supply system of flyback insulating power supply chip 4 keeps charge mode；As VO ＞ V1, flyback isolation electricity
Source chip 4 controls lithium battery power supply system finishing charge mode, and lithium battery power supply system enters standby mode.Electric main is powered off
In the case of, by 4 detection to voltage VO of chip of flyback insulating power supply, control lithium battery power supply system is in standby mode and charging
Toggled between pattern, and then offer of the lithium battery as stand-by power supply to clock supply circuit energy is provided.Whole work
Process.Under the overshoot condition for ignoring detection process voltage VO, voltage VO is met：V2 ＜ VO ＜ V1.
Threshold voltage V1 is clock power Typical operating voltages；Threshold voltage V2 is met less than clock power exemplary operation electricity
Pressure, and more than the minimum power supply voltage, of clock circuit normal work.The two threshold voltages magnitude relationship is V2 ＜ V1.
2nd, the course of work is as follows in the presence of electric main
In the presence of electric main, the operating voltage of clock supply circuit is provided by AC mains circuit 13.The power supply
Under environment, due to each polling period, flyback insulating power supply chip 4 can all detect power supply VO ＞ V2, therefore lithium battery power supply
System is in standby mode all the time.Now, the main static working current for carrying flyback insulating power supply chip 4 of lithium battery 1.Instead
It is low speed paper tape reader static power disspation power supply chip to swash insulating power supply chip 4, reduces damage of the lithium battery power supply system itself to electric quantity of lithium battery
Consumption, extends the service life of lithium battery.Meanwhile, the design of inspection function is avoided because electric main is interrupted in standby mode,
Because lithium battery 1 can not participate in clock entanglement caused by power supply causes voltage VO power down in time.
3rd, electric quantity of lithium battery detection function
When lithium battery 1 is in electric quantity consumption edge, its internal resistance can be dramatically increased.According to this characteristic, timing leads to
Control signal CTR closure NMOS tubes 11 are crossed, and when forcing to drag down SW1 terminal voltage inspections pulse arrival by the 3rd diode 9, by
Acted in the 3rd diode 9 and the strong pull-down of NMOS tube 11, flyback insulating power supply chip 4 can detect voltage VO ＜ V3.Voltage
V1, V2 and V3 magnitude relationship is, V1 ＞ V2 ＞ V3, therefore the enable information that VO ＜ V3 are detected as battery electric quantity.Battery
After the enable of electric power detection, 4, flyback insulating power supply core is discharged lithium battery 1 by resistance 2 with electric current I, and detection should
The output voltage VCC of lithium battery 1 size, the situation of change of the internal resistance of lithium battery 1 is learnt with this under discharge level.By above-mentioned to lithium
In the description of the inner resistance of battery 1 and internal resistance detection method, battery electric quantity detection process, if measuring the output voltage of lithium battery 1
VCC ＞ V4, then it is assumed that battery electric quantity is sufficient；If measuring the output voltage VCC ＜ V4 of lithium battery 1, then it is assumed that battery electric quantity is in
Edge is exhausted, now system exports under-voltage signal, and is sent by intelligent electric meter because dead battery capability need to change the logical of battery
Know.
Fig. 3 is the structural representation of flyback insulating power supply chip 4.As illustrated, reference circuit in flyback insulating power supply chip
14 as whole chip base modules, for the reference voltage and reference current needed for each module offer work of chip.Battery is examined
The first input end of slowdown monitoring circuit 15 is used as chip pin TR；Second input is connected with the output end of reference circuit 14 first；The
Three inputs are connected with the flyback detection output end OC of circuit 17 second, for opening battery electric quantity detection function；First output
End OA is connected with the input of pierce circuit 16 second, electric quantity of lithium battery detection process, if detecting dead battery capability letter
Breath, then change the working frequency of pierce circuit 16, and be turned to whether electricity consumes with the change of this frequency by the output end signal
Most criterion.The first input end of pierce circuit 16 is connected with the second output end of reference circuit 14；3rd input
The the first output end OB for detecting circuit 17 with flyback is connected, for detecting inspection of the circuit 17 to voltage VO sizes according to flyback
Survey, control lithium battery power supply system switches between standby mode and charge mode；First output end and output logic circuit 19
First input end is connected, output switching signal OSC, switching signal when being worked as system.Flyback detects circuit 17 first
Input is connected with the output end of reference circuit 14 the 3rd；Second input is connected with the output end of inspection clock circuit 18,
Realize the inspection function of lithium battery power supply system under standby mode；3rd input is connected with chip pin SW；Second output
End OC is connected with the input of battery detection circuit 15 the 3rd, is used as the enable signal of battery detection circuit 15, control battery inspection
Whether slowdown monitoring circuit 15 starts battery detecting function.4th output of the first input end of inspection clock circuit 18 and reference circuit 14
End is connected；Second input is used as chip pin TIM；Output end OD is connected with the flyback detection input of circuit 17 second,
Realize the inspection function of lithium battery power supply system under standby mode.Flyback insulating power supply chip 4 is used as lithium battery power supply system
Control chip, switching signal during electric power system charge mode is produced by pierce circuit 16；By battery detection circuit 15,
The inspection of battery electric quantity is completed, and by changing what whether the switching frequency of the output signal of pierce circuit 16 exhausted as electricity
Criterion；The detection voltage VO of circuit 17 size is detected by flyback, the charge mode of electric power system is determined, and determined whether
Need to open battery electric quantity detection function；Electric power system is controlled regularly to be detected when being in standby mode by inspection clock circuit 18
Inspection voltage VO size, it is to avoid because electric main is interrupted, because lithium battery 1 can not participate in power supply in time cause voltage VO to fall
Clock entanglement caused by electricity.
Fig. 4 is standby mode of the present invention and charge mode switching control flow graph.Signal VO is clock circuit operating voltage；Letter
Number V1 and V2 is differentiates the threshold voltage of clock voltage VO sizes；The switching signal that signal OSC pierce circuits 16 are produced, the letter
Number as lithium battery power supply system under charge mode switching signal；Signal OD is the inspection letter that inspection clock circuit 18 is exported
Number；Signal OB is the output signal that flyback detects circuit 17, and the signal reflects voltage VO size.As illustrated, charging mould
In formula, because flyback detection circuit 17 detects voltage VO ＜ V1, signal OB keeps low level now oscillator output continuously to open
OFF signal, completes lithium battery energy to the transmission of electric capacity 10, output voltage gradually rises；With the rise of output voltage, during t1
Carve, when flyback detection circuit 17 detects clock voltage VO ＞ V1, now signal OB is changed into high level, closes pierce circuit
In switching signal output, lithium battery power supply system enters standby mode.In standby mode, with the power consumption of clock circuit, electricity
Pressure VO is gradually reduced, and t2 moment inspection signals OD is produced, and forces pierce circuit 16 to export a switching signal, whereby switch letter
Number flyback detection circuit 17 completes the detection to voltage VO, and now due to detecting VO ＞ V2, lithium battery power supply system keeps treating
Machine pattern；After multiple polling periods, t3 moment flyback detection circuit 17 detects VO ＜ V2, and lithium battery power supply system finishing is treated
Machine pattern, circuit enters charge mode.And so on, no electric main electric power thus supplied, passes through detection voltage VO size, control
Lithium battery power supply system is toggled between standby mode and charge mode, and then when completing lithium battery as stand-by power supply pair
The offer of clock circuit energy.
In summary, a kind of isolated battery powdered device for providing of the present invention not only realize battery feed circuit and when
The isolation of clock circuit ground, it is to avoid Danger Electric shock risk that may be present during battery altering；And avoid battery and MCU pipes
The connecting path of pin, eliminates and changes the electrostatic impact risk to MCU pin that battery operation is brought.
Finally it should be noted that above example is only to illustrate technique device of the invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to the foregoing embodiments for pipe, it will be understood by those within the art that；It is still
Technique device described in previous embodiment can be modified, or equivalent is carried out to which part technical characteristic；
And these modifications or replacement, the essence of relevant art device is departed from the spirit and model of embodiment of the present invention technique device
Enclose.
Claims (2)
1. a kind of isolated battery powdered device, it is characterised in that the isolated battery powdered device includes a lithium battery, one
Resistance R1, a capacitor C1, a flyback insulating power supply chip, a transformer, one enable circuit, clock supply circuit and an exchange
Mains circuit, wherein,
The lithium battery is as the stand-by power supply without intelligent electric meter clock circuit in the presence of electric main, for providing clock circuit
Operating voltage, it is to avoid the clock entanglement caused by clock circuit power down；
The first input end of the flyback insulating power supply chip is connected with lithium battery anode VCC, is used as chip power input；
Second input is connected by resistance R1 with VCC, and the pull-down current that size is I is produced for battery electric quantity detection process；The
Three inputs are connected by capacitor C1 with GND1, for producing inspection signal；4th input is connected with GND1, as
Chip ground wire input, output end is connected to lithium battery anode VCC by transformer main coil L1；
The transformer main coil L1 two ends are respectively connecting to the positive pole VCC and flyback isolating chip output end of lithium battery, transformation
Device secondary coil L2 two ends are respectively connecting to clock supply circuit first input end and ground wire GND2, for completing lithium battery to clock
The energy transmission of power circuit；
The enable circuit is connected between clock supply circuit first input end and ground wire GND2, for opening lithium battery power supply
The battery electric quantity detection function of system；
The clock supply circuit first input end is connected with transformer, and the second input is connected with AC mains circuit
Connect, output voltage VO as clock circuit power supply；In the case of electric main is present, the clock supply circuit is to exchange city
Electric power circuit output VDD is that there is provided clock circuit operating voltage VO for power supply；Under electric main powering-off state, the clock power
There is provided clock circuit operating voltage VO by stand-by power supply of lithium battery for circuit；
The AC mains circuit is the low-tension supply produced using electric main as power supply, is existed in electric main
In the case of there is provided the operating voltage of clock supply circuit.
2. a kind of isolated battery powdered device as claimed in claim 1, it is characterised in that flyback insulating power supply chip is low
The electric quantity of lithium battery loss that quiescent dissipation power supply chip, greatly reduction flyback insulating power supply chip itself are brought.
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| CN106644143B (en) * | 2016-11-15 | 2019-02-15 | 国网河南省电力公司漯河供电公司 | A kind of power-supply system of single-phase intelligent electric energy meter |
| CN109802152B (en) * | 2019-02-20 | 2022-04-05 | 广西睿奕新能源股份有限公司 | Application of circuit structure for monitoring capacity of lithium disposable battery |
| CN110932559A (en) * | 2019-12-03 | 2020-03-27 | 成都长城开发科技有限公司 | Power module of ammeter |
| CN112217273B (en) * | 2019-12-30 | 2022-04-08 | 蜂巢能源科技有限公司 | Monitoring method and monitoring device for battery management system |
| 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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