CN105006859A - Storage battery detection apparatus and detection method thereof based on BUCK charger - Google Patents
Storage battery detection apparatus and detection method thereof based on BUCK charger Download PDFInfo
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- CN105006859A CN105006859A CN201510423832.9A CN201510423832A CN105006859A CN 105006859 A CN105006859 A CN 105006859A CN 201510423832 A CN201510423832 A CN 201510423832A CN 105006859 A CN105006859 A CN 105006859A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a storage battery detection apparatus and a detection method thereof based on a BUCK charger. The voltage value Uout of an output terminal of the BUCK charger is acquired in real time via a voltage acquisition module, and the output terminal of the BUCK charger is connected to a storage battery; the voltage value Uout of the output terminal of the BUCK charger and a storage battery low-voltage threshold Ulow are compared, and the storage battery is not connected to the BUCK charger if Uout<=Ulow; N output voltage values Uout of the BUCK charger acquired in real time are stored via a determination module, and the maximum Umax and the minimum Umin of the voltage values Uout of the output terminal of the BUCK charger are obtained; whether the difference between the maximum Umax and the minimum Umin of the voltage values of the output terminal of the BUCK charger is more than or equal to Uset is determined via the determination module, wherein Uset is a preset work voltage, and the storage battery is not connected to the BUCK charger if Umax-Umin>=Uset. The beneficial effects of the detection apparatus and the detection method thereof are that whether the connection of the storage battery is abnormal can be determined on-line, the determination method is simple, and real-time determination can be realized.
Description
Technical field
The present invention relates to ice storing time field, particularly relate to a kind of detecting device for storage battery based on BUCK charger and detection method thereof.
Background technology
The output of BUCK charger has direct voltage to exist always under normal circumstances, whether storage battery is connect or abnormal is difficult to make effective judgement, if because storage battery does not connect or abnormal and cause load power down will to be a very serious problem.
Existing storage battery does not connect detection technique patent and mainly contains as follows:
General conventional way has two kinds:
(1) battery discharge method is adopted, when battery charge comparatively small (or not having electric current), pressure turns battery discharge, whether detect battery by the method for battery discharge to connect, the shortcoming of the method, one is that battery cannot frequently discharge if being obvious, so also just cannot detect that battery does not connect in real time, in addition, discharge frequently and easily cause storage battery aging, affect capacity and the useful life of battery.
(2) another is method of perturbation, judges cell voltage reduces how much judged whether whether battery is also articulated in system by closing driving.There is a shortcoming in the method: be exactly that output voltage current waveform there will be intermittently to cause and exports jagged, and control ring rood is made and closed corresponding process such as driving.
Publication number is: CN 102901903, and patent name is " UPS storage battery disconnection detection device ", at charger, oneself opens, if charging current is enough large, then judge that storage battery does not have open circuit, if charging current is very little, by battery tension, charge closing device judges whether storage battery does not connect.Existing problems: 1. this checkout gear needs charging current detecting circuit; 2. when performing a test must charge closing device, this just makes UPS that charging voltage and battery tension can not be adopted separately to input as power supply, otherwise can cause power interruptions.
Another publication number is CN 103176100, and patent name is " detecting method and device that battery do not connect in a kind of UPS " is by control ChargeOn/Off switch, control charging panel relay whether to charge to battery, then by judging that cell voltage detects battery and whether connects normally.The problem that rear UPS can not adopt separately charging voltage and cell voltage to input as power supply is closed in same existence charging, otherwise has the risk of power interruptions equally.
Summary of the invention
The object of the invention is for above weak point, provide a kind of detecting device for storage battery based on BUCK charger and detection method thereof, realize judging online the whether access exception of storage battery.
The scheme that technical solution problem of the present invention adopts is: a kind of detecting device for storage battery based on BUCK charger, comprise a BUCK charger, the output of described BUCK charger is connected to a storage battery, described BUCK charger is by a switching device Q1, one sustained diode 1 and an inductance L 1 are formed, the collector electrode of described switching device Q1 is connected to the positive input terminal Bus+ of described BUCK charger, the emitter of described switching device is connected to the negative electrode of described sustained diode 1 and one end of described inductance L 1 respectively, the anode of described sustained diode 1 is connected to described BUCK charger negative input end Bus-, the output of described BUCK charger is parallel with a virtual impedance circuit, described virtual impedance circuit is made up of an electric capacity C1 resistance R1 in parallel, one end of described electric capacity C1 is connected with the other end of described inductance L 1, the other end of this electric capacity C1 is connected to the negative input end Bus-of described BUCK charger, described BUCK charger is also connected with one for Real-time Collection BUCK charger output voltage values Uout voltage acquisition module, the collection period of this voltage acquisition module is Ts, Ts=Tws/N, wherein Tws is the PWM cycle of the switching device Q1 of BUCK charger, N is positive integer and N >=5, and R1C1 >=2Tws, the magnitude of voltage of collection is inputed to a judge module being used for judging whether storage battery does not connect by described voltage acquisition module.
Further, when described BUCk charger is not in charged state, now by the low pressure threshold Ulow of described judge module more described BUCK charger output voltage values Uout and storage battery, as Uout < Ulow, then storage battery does not access BUCK charger, as Uout >=Ulow, then storage battery access BUCK charger; When described BUCk charger is in charged state, now obtain maximum Umax in N number of BUCK charger output voltage values Uout and minimum value Umin by described judge module, as Umax-Umin >=Uset, then storage battery does not access BUCK charger, otherwise storage battery access BUCK charger, wherein Uset is predeterminated voltage.
Further, also comprise one for sending the alarm module of alarm signal when described storage battery does not access BUCK charger, described alarm module is electrically connected with described judge module.
Further, also comprise one for the current acquisition module of Real-time Collection BUCK charger charging current, described current acquisition module is electrically connected with described judge module.
Further, the collection period of described current acquisition module is Tp, Tp=Tws/M, M is positive integer and M>=5, if described BUCK charger has accessed described storage battery, by M charging current value Ibat1 of described current acquisition module acquires, Ibat2 ..., IbatM inputs to described judge module and simulates the current curve of BUCK charger output
, and M the BUCK charger output voltage values Uout1 gathered by described voltage acquisition module, Uout2 ..., UoutM simulates the voltage curve of BUCK charger output
, wherein M is positive integer and M < N, and according to
,
matching accumulator internal resistance
, wherein
.
Further, the present invention also provides a kind of detection method of the detecting device for storage battery based on above-mentioned BUCK charger, comprises the following steps:
Step S1: by the magnitude of voltage Uout extremely described judge module of described voltage acquisition module Real-time Collection BUCK charger output, collection period is Ts, Ts=Tws/N, and wherein Tws is the PWM cycle of the switching device Q1 of BUCK charger, and N is positive integer and N >=5;
Step S2: whether conducting judges whether described BUCK charger is in charged state according to described switching device Q1, if the non-conducting of switching device Q1, then described BUCK charger is not in charged state, proceeds to step S3; If switching device Q1 conducting, then described BUCK charger is in charged state, proceeds to step S4;
Step S3: by the low pressure threshold Ulow of described judge module more described BUCK charger output voltage values Uout and storage battery, as Uout < Ulow, then storage battery does not access BUCK charger; As Uout >=Ulow, then storage battery access BUCK charger;
Step S4: obtain maximum Umax in N number of BUCK charger output voltage values Uout and minimum value Umin by described judge module, as Umax-Umin >=Uset, then storage battery does not access BUCK charger, otherwise storage battery access BUCK charger, wherein Uset is predeterminated voltage.
Further, in step s 4 which, when described storage battery accesses described BUCK charger, further comprising the steps of:
Step S40: by the charging current value Ibat of a current acquisition module Real-time Collection BUCK charger, collection period is Tp, Tp=Tws/M, and wherein Tws is the cycle of the PWM switch of BUCK charger, and M is positive integer and M >=5;
Step S41: by M charging current value Ibat1 of described current acquisition module acquires, Ibat2 ..., IbatM inputs to described judge module and simulates the current curve of BUCK charger output
, and M the BUCK charger output voltage values Uout1 gathered by described voltage acquisition module, Uout2 ..., UoutM simulates the voltage curve of BUCK charger output
, wherein M is positive integer and M < N;
Step S42: the current curve simulated according to described judge module
with the voltage curve simulated
matching accumulator internal resistance curve
, wherein
;
Step S43: if described accumulator internal resistance
set, wherein
set is preset resistance, then trigger an alarm module through described judge module and produce alarm signal.
Further, the ice storing time method based on BUCK charger according to claim 7, in described step S3 or step S4, if storage battery does not access BUCK charger, then described judge module triggers described alarm module and sends alarm signal.
Compared with prior art, the present invention has following beneficial effect:
(1) judgement that do not connect storage battery of the present invention is without the need to detecting charging current, be for connecing battery and not connecing storage battery, BUCK charger output voltage waveforms there are differences, according to the difference on BUCK charger output voltage waveforms, can judge that whether the access of storage battery is abnormal online, and without the need to powered-down, possess that determination methods is simple, the advantage of real-time judge.
(2) interruption causing power supply when adopting charging voltage or battery tension to input as UPS working power is avoided, storage battery keeps in real time in charging, even if storage battery does not connect can not cause power interruptions yet, efficiently solve UPS in prior art and perform the problem that when storage battery does not connect test, charger turns off.
(3) in the conducting phase of the switching device Q1 of BUCK charger, by output voltage, the charging current detection computations accumulator internal resistance of BUCK charger, accumulator property is judged, for the performance of auxiliary judgment battery.
(4) avoid causing battery discharging due to detection thus reduce the charge efficiency of storage battery and useful life, having the harmless feature of battery.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, patent of the present invention is further illustrated.
Fig. 1 is the circuit structure block diagram of the embodiment of the present invention.
Fig. 2 is the BUCK charger of the embodiment of the present invention and the circuit theory diagrams of virtual impedance circuit.
Fig. 3 is the curve chart of BUCK charger output voltage Uout under different conditions of the embodiment of the present invention.
Fig. 4 is the BUCK charger voltage of the embodiment of the present invention, electric current and PWM curve chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in figures 1-4, the present embodiment provides a kind of detecting device for storage battery based on BUCK charger, comprise a BUCK charger, the output of described BUCK charger is connected to a storage battery, described BUCK charger is by a switching device Q1, one sustained diode 1 and an inductance L 1 are formed, the collector electrode of described switching device Q1 is connected to the positive input terminal Bus+ of described BUCK charger, the emitter of described switching device is connected to the negative electrode of described sustained diode 1 and one end of described inductance L 1 respectively, the anode of described sustained diode 1 is connected to described BUCK charger negative input end Bus-, the output of described BUCK charger is parallel with a virtual impedance circuit, described virtual impedance circuit is made up of an electric capacity C1 resistance R1 in parallel, one end of described electric capacity C1 is connected with the other end of described inductance L 1, the other end of this electric capacity C1 is connected to the negative input end Bus-of described BUCK charger, described BUCK charger is also connected with one for Real-time Collection BUCK charger output voltage values Uout voltage acquisition module, the collection period of this voltage acquisition module is Ts, Ts=Tws/N, wherein Tws is the PWM cycle of the switching device Q1 of BUCK charger, N is positive integer and N >=5, and R1C1 >=2Tws, the magnitude of voltage of collection is inputed to a judge module being used for judging whether storage battery does not connect by described voltage acquisition module.
In the present embodiment, when described BUCk charger is not in charged state, now by the low pressure threshold Ulow of described judge module more described BUCK charger output voltage values Uout and storage battery, as Uout < Ulow, then storage battery does not access BUCK charger, as Uout >=Ulow, then storage battery access BUCK charger; When described BUCk charger is in charged state, now obtain maximum Umax in N number of BUCK charger output voltage values Uout and minimum value Umin by described judge module, as Umax-Umin >=Uset, then storage battery does not access BUCK charger, otherwise storage battery access BUCK charger, wherein Uset is predeterminated voltage.
In the present embodiment, also comprise one for sending the alarm module of alarm signal when described storage battery does not access BUCK charger, described alarm module is electrically connected with described judge module.
In the present embodiment, also comprise one for the current acquisition module of Real-time Collection BUCK charger charging current, described current acquisition module is electrically connected with described judge module.
In the present embodiment, the collection period of described current acquisition module is Tp, Tp=Tws/M, M is positive integer and M>=5, if described BUCK charger has accessed described storage battery, by M charging current value Ibat1 of described current acquisition module acquires, Ibat2 ..., IbatM inputs to described judge module and simulates the current curve of BUCK charger output
, and M the BUCK charger output voltage values Uout1 gathered by described voltage acquisition module, Uout2 ..., UoutM simulates the voltage curve of BUCK charger output
, wherein M is positive integer and M < N, and according to
,
matching accumulator internal resistance
, wherein
.
The present invention also provides a kind of detection method of the detecting device for storage battery based on above-mentioned BUCK charger, comprises the following steps:
Step S1: by the magnitude of voltage Uout extremely described judge module of described voltage acquisition module Real-time Collection BUCK charger output, collection period is Ts, Ts=Tws/N, and wherein Tws is the PWM cycle of the switching device Q1 of BUCK charger, and N is positive integer and N >=5;
Step S2: whether conducting judges whether described BUCK charger is in charged state according to described switching device Q1, if the non-conducting of switching device Q1, then described BUCK charger is not in charged state, proceeds to step S3; If switching device Q1 conducting, then described BUCK charger is in charged state, proceeds to step S4;
Step S3: by the low pressure threshold Ulow of described judge module more described BUCK charger output voltage values Uout and storage battery, as Uout < Ulow, then storage battery does not access BUCK charger; As Uout >=Ulow, then storage battery access BUCK charger;
Step S4: obtain maximum Umax in N number of BUCK charger output voltage values Uout and minimum value Umin by described judge module, as Umax-Umin >=Uset, then storage battery does not access BUCK charger, otherwise storage battery access BUCK charger, wherein Uset is predeterminated voltage.
In the present embodiment, in step s 4 which, when described storage battery accesses described BUCK charger, further comprising the steps of:
Step S40: by the charging current value Ibat of a current acquisition module Real-time Collection BUCK charger, collection period is Tp, Tp=Tws/M, and wherein Tws is the cycle of the PWM switch of BUCK charger, and M is positive integer and M >=5;
Step S41: by M charging current value Ibat1 of described current acquisition module acquires, Ibat2 ..., IbatM inputs to described judge module and simulates the current curve of BUCK charger output
, and M the BUCK charger output voltage values Uout1 gathered by described voltage acquisition module, Uout2 ..., UoutM simulates the voltage curve of BUCK charger output
, wherein M is positive integer and M < N;
Step S42: the current curve simulated according to described judge module
with the voltage curve simulated
matching accumulator internal resistance curve
, wherein
;
Step S43: if described accumulator internal resistance
set, wherein
set is preset resistance, then trigger an alarm module through described judge module and produce alarm signal.
In the present embodiment, the ice storing time method based on BUCK charger according to claim 7, in described step S3 or step S4, if storage battery does not access BUCK charger, then described judge module triggers described alarm module and sends alarm signal.
Judging whether BUCK charger is in charged state is whether have PWM drive singal according to the control pole of switching device Q1.As shown in Figure 3, the voltage waveform of BUCK charger voltage sampling circuit sampling under different operating mode is discrepant:
Under BUCK charger does not connect storage battery situation, control when BUCK charger carries out charging, at BUCK charger conducting phase Tdty, voltage sampling circuit sampling BUCK charger output voltage values Uout is that a fixed value is charged to R1C1 in virtual impedance circuit, in BUCK charger off-phases, R1C1 discharges, voltage sampling circuit sampling BUCK charger output voltage values Uout;
Under BUCK charger has connect storage battery situation, waveform is as shown in Figure 3 the waveform of mounting battery charging, and this waveform is comparatively straight, in BUCK charger conducting phase, cell voltage present slightly on lift trend, and the stage that BUCK charger turns off, due to the existence of inductance L 1 afterflow, voltage can present downward trend slightly, because battery is equivalent to the existence of voltage source, therefore, whole change in voltage is not very large, presents a boss and a concave station in waveform one-period.
As shown in Figure 4, when storage battery normally accesses BUCK charger, at current PWM control cycle, switching device Q1 conducting phase, control module is according to M charging current value Ibat1, Ibat2 ... IbatM matching
and M BUCK charger output voltage values Uout1, Uout2 ... UoutM matching
, described M is positive integer and M < N, and according to
,
matching accumulator internal resistance
.Work as accumulator internal resistance
, described judge module also can produce alarm signal, reports to the police.
In sum, the detecting device for storage battery based on BUCK charger provided by the invention and detection method thereof, can judge that storage battery access is whether abnormal online, possesses that determination methods is simple, the advantage of real-time judge.
Above-listed preferred embodiment provided by the invention; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the detecting device for storage battery based on BUCK charger, comprise a BUCK charger, the output of described BUCK charger is connected to a storage battery, described BUCK charger is by a switching device Q1, one sustained diode 1 and an inductance L 1 are formed, the collector electrode of described switching device Q1 is connected to the positive input terminal Bus+ of described BUCK charger, the emitter of described switching device is connected to the negative electrode of described sustained diode 1 and one end of described inductance L 1 respectively, the anode of described sustained diode 1 is connected to described BUCK charger negative input end Bus-, it is characterized in that: the output of described BUCK charger is parallel with a virtual impedance circuit, described virtual impedance circuit is made up of an electric capacity C1 resistance R1 in parallel, one end of described electric capacity C1 is connected with the other end of described inductance L 1, the other end of this electric capacity C1 is connected to the negative input end Bus-of described BUCK charger, described BUCK charger is also connected with one for Real-time Collection BUCK charger output voltage values Uout voltage acquisition module, the collection period of this voltage acquisition module is Ts, Ts=Tws/N, wherein Tws is the PWM cycle of the switching device Q1 of BUCK charger, N is positive integer and N >=5, and R1C1 >=2Tws, the magnitude of voltage of collection is inputed to a judge module being used for judging whether storage battery does not connect by described voltage acquisition module.
2. the detecting device for storage battery based on BUCK charger according to claim 1, it is characterized in that: when described BUCk charger is not in charged state, now by the low pressure threshold Ulow of described judge module more described BUCK charger output voltage values Uout and storage battery, as Uout < Ulow, then storage battery does not access BUCK charger, as Uout >=Ulow, then storage battery access BUCK charger; When described BUCk charger is in charged state, now obtain maximum Umax in N number of BUCK charger output voltage values Uout and minimum value Umin by described judge module, as Umax-Umin >=Uset, then storage battery does not access BUCK charger, otherwise storage battery access BUCK charger, wherein Uset is predeterminated voltage.
3. the detecting device for storage battery based on BUCK charger according to claim 1, it is characterized in that: also comprise one for sending the alarm module of alarm signal when described storage battery does not access BUCK charger, described alarm module is electrically connected with described judge module.
4. the detecting device for storage battery based on BUCK charger according to claim 1, is characterized in that: also comprise one for the current acquisition module of Real-time Collection BUCK charger charging current, described current acquisition module is electrically connected with described judge module.
5. the detecting device for storage battery based on BUCK charger according to claim 4, it is characterized in that: the collection period of described current acquisition module is Tp, Tp=Tws/M, M is positive integer and M>=5, if described BUCK charger has accessed described storage battery, by M charging current value Ibat1 of described current acquisition module acquires, Ibat2 ..., IbatM inputs to described judge module and simulates the current curve of BUCK charger output
, and M the BUCK charger output voltage values Uout1 gathered by described voltage acquisition module, Uout2 ..., UoutM simulates the voltage curve of BUCK charger output
, wherein M is positive integer and M < N, and according to
,
matching accumulator internal resistance
, wherein
.
6. the detection method of the detecting device for storage battery based on BUCK charger according to claim 1, is characterized in that, comprise the following steps:
Step S1: by the magnitude of voltage Uout extremely described judge module of described voltage acquisition module Real-time Collection BUCK charger output, collection period is Ts, Ts=Tws/N, and wherein Tws is the PWM cycle of the switching device Q1 of BUCK charger, and N is positive integer and N >=5;
Step S2: if described BUCK charger is not in charged state, proceed to step S3; If BUCK charger is in charged state, proceed to step S4;
Step S3: by the low pressure threshold Ulow of described judge module more described BUCK charger output voltage values Uout and storage battery, as Uout < Ulow, then storage battery does not access BUCK charger; As Uout >=Ulow, then storage battery access BUCK charger;
Step S4: obtain maximum Umax in N number of BUCK charger output voltage values Uout and minimum value Umin by described judge module, as Umax-Umin >=Uset, then storage battery does not access BUCK charger, otherwise storage battery access BUCK charger, wherein Uset is predeterminated voltage.
7. the ice storing time method based on BUCK charger according to claim 6, is characterized in that: in step s 4 which, when described storage battery accesses described BUCK charger, further comprising the steps of:
Step S40: by the charging current value Ibat of a current acquisition module Real-time Collection BUCK charger, collection period is Tp, Tp=Tws/M, and wherein Tws is the cycle of the PWM switch of BUCK charger, and M is positive integer and M >=5;
Step S41: by M charging current value Ibat1 of described current acquisition module acquires, Ibat2 ..., IbatM inputs to described judge module and simulates the current curve of BUCK charger output
, and M the BUCK charger output voltage values Uout1 gathered by described voltage acquisition module, Uout2 ..., UoutM simulates the voltage curve of BUCK charger output
, wherein M is positive integer and M < N;
Step S42: the current curve simulated according to described judge module
with the voltage curve simulated
matching accumulator internal resistance curve
, wherein
;
Step S43: if described accumulator internal resistance
set, wherein
set is preset resistance, then trigger an alarm module through described judge module and produce alarm signal.
8. the ice storing time method based on BUCK charger according to claim 7, is characterized in that: in described step S3 or step S4, if storage battery does not access BUCK charger, then described judge module triggers described alarm module and sends alarm signal.
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| CN112994168A (en) * | 2021-03-19 | 2021-06-18 | 成都市菱奇半导体有限公司 | Charging circuit and charger for detecting battery load plugging state |
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| CN105006859B (en) | 2018-06-08 |
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