CN100355181C - A charging circuit and charging method and equalizing charger therefor - Google Patents
A charging circuit and charging method and equalizing charger therefor Download PDFInfo
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- CN100355181C CN100355181C CNB2004100226080A CN200410022608A CN100355181C CN 100355181 C CN100355181 C CN 100355181C CN B2004100226080 A CNB2004100226080 A CN B2004100226080A CN 200410022608 A CN200410022608 A CN 200410022608A CN 100355181 C CN100355181 C CN 100355181C
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 23
- 230000001681 protective effect Effects 0.000 claims description 14
- 230000000052 comparative effect Effects 0.000 claims description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
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- 230000009466 transformation Effects 0.000 description 1
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Abstract
The present invention relates to a charger, and provides a charging circuit which comprises an overvoltage protecting unit for the charging circuit, a second overvoltage protecting unit and a third overvoltage protecting unit, wherein triple protecting units respectively sample the charging voltage of a battery to be charged, the sampled charging voltages are respectively compared with a first reference voltage V1, a second reference voltage V2 and a third reference voltage V3, when VC is larger than the reference voltage, the corresponding overvoltage protecting unit performs the function of protection, and the first voltage reference, the second voltage reference and the third voltage reference forms the relationship that V3>V2>V1. The present invention designs triple overvoltage protecting circuits so as to ensure the safety and the reliability of the battery in a charging process.
Description
[technical field]
The present invention relates to a kind of charger, relate in particular to a kind of charging circuit and charging method, and the equalizing charger of using this charging circuit.
[background technology]
Along with chargeable battery in the application more and more widely of various fields, the useful life and the fail safe of chargeable battery are also more and more paid close attention to by people.Chargeable battery is because of the characteristics of itself, overcharges the life-span that can shorten battery, more seriously may blast, and lithium ion battery especially, because of inside battery contains organic solvent, the ability that overcharges that it can bear is littler, easier generation security incident.Generally can self overvoltage crowbar of design in charger, but when charger breaks down, himself overvoltage crowbar no longer works, and still can cause battery charge too high, cause chargeable battery to overcharge, thereby it is dangerous to cause this chargeable battery.For bigger power being provided and every batteries capacity being consistent in its life cycle; people utilize equalizing charger to charge; generally design has aforesaid self overvoltage crowbar in each single-unit charger; but when certain joint charger self overvoltage crowbar breaks down, the overcharging of this uncontrollable this batteries of joint charger.
[summary of the invention]
Main purpose of the present invention is exactly the problem that can't guarantee chargeable battery charging safety in the prior art in order to solve; a kind of charging circuit and charging method thereof are provided; when charger self overvoltage crowbar breaks down, still can effectively protect chargeable battery not overcharged, safe and reliable.
Main purpose of the present invention just provides a kind of equalizing charger, when certain joint charger self overvoltage crowbar breaks down, still can effectively protect this batteries not overcharged.
For achieving the above object, the present invention proposes a kind of charging circuit, comprising:
Charhing unit: input is connected with power supply, and output B+, B-are respectively applied for and connect the both positive and negative polarity that is recharged the pond;
First Overvoltage protecting unit: the output B+, the B-that connect described charhing unit respectively, be recharged the charging voltage in pond with sampling, compare with first reference voltage, be used for when charging voltage VC rises above the first reference voltage V1, transmitting control signal 11 to charhing unit, the control charhing unit stops continuing charging to being recharged the pond, wherein VC is the charging voltage that is recharged the pond, and V1 is first reference voltage;
Second Overvoltage protecting unit: charging voltage sampling end 21,22 connects output B+, the B-of described charhing unit respectively, being used to sample is recharged the charging voltage in pond, and the cut-off signals pin of described second Overvoltage protecting unit is coupled to the power control switch of charhing unit; Described second Overvoltage protecting unit is used for charging voltage VC is compared with second reference voltage; when rising above the second reference voltage V2, charging voltage VC sends the power control switch of cut-off signals Poff1 to charhing unit; charhing unit is automatically shut down; wherein V2 is second reference voltage, described V2＞V1.
The 3rd Overvoltage protecting unit, the charging voltage sampling end 31,32 of described the 3rd Overvoltage protecting unit connects output B+, the B-of described charhing unit respectively, being used to sample is recharged the charging voltage in pond, and the cut-off signals pin of described the 3rd Overvoltage protecting unit is coupled to the power control switch of charhing unit; Described the 3rd Overvoltage protecting unit is used for charging voltage VC is compared with the 3rd reference voltage; be used for when charging voltage VC rises above the 3rd reference voltage V3, sending the power control switch of cut-off signals Poff 2 to charhing unit; the control charhing unit automatically shuts down; wherein V3 is the 3rd reference voltage, described V3＞V2＞V1.
For achieving the above object, the invention allows for a kind of charging method, may further comprise the steps:
The voltage acquisition step: to being recharged in the charging process of pond, each protective circuit is sampled respectively and is recharged the charging voltage VC in pond, and wherein VC is the charging voltage that is recharged the pond;
The first protection step: the first reference voltage V1 that will be recharged charging voltage VC and charger self Overvoltage protecting unit in pond compares, and when VC＜V1, continues charging, when VC＞V1, stops continuing to charge to being recharged the pond;
The second protection step: the charging voltage VC that will be recharged the pond compares with the second reference voltage V2 of second Overvoltage protecting unit; when VC＜V2; second Overvoltage protecting unit is failure to actuate; when VC＞V2; second Overvoltage protecting unit sends the power control switch of cut-off signals to charhing unit; charhing unit is automatically shut down, wherein V2＞V1.
The 3rd protection step: the charging voltage VC that will be recharged the pond compares with the 3rd reference voltage V3 of the 3rd Overvoltage protecting unit; when VC＜V3; the 3rd Overvoltage protecting unit is failure to actuate; when VC＞V3; the 3rd Overvoltage protecting unit sends the power control switch of cut-off signals to charhing unit; charhing unit is automatically shut down, wherein V3＞V2＞V1.
For the above-mentioned charging circuit of better utilization, the invention provides a kind of equalizing charger, comprise two or more identical charging circuits that are connected in parallel, described charging circuit comprises:
Charhing unit: input is connected with power supply, and output B+, B-are respectively applied for and connect the both positive and negative polarity that is recharged the pond;
First Overvoltage protecting unit: the output B+, the B-that connect described charhing unit respectively, be recharged the charging voltage in pond with sampling, compare with first reference voltage, be used for when charging voltage VC rises above the first reference voltage V1, producing control signal 11 to charhing unit, termination continues charging to being recharged the pond, wherein VC is the charging voltage that is recharged the pond, and V1 is first reference voltage;
Second Overvoltage protecting unit: charging voltage sampling end 21,22 connects output B+, the B-of described charhing unit respectively, being used to sample is recharged the charging voltage in pond, and the cut-off signals pin of described second Overvoltage protecting unit is coupled to the power control switch of charhing unit; Described second Overvoltage protecting unit is used for charging voltage VC is compared with second reference voltage, be used for when charging voltage VC rises above the second reference voltage V2, sending the power control switch of cut-off signals Poff 1 to charhing unit, charhing unit is automatically shut down, wherein V2 is second reference voltage, described V2＞V1;
The 3rd Overvoltage protecting unit, the charging voltage sampling end 31,32 of described the 3rd Overvoltage protecting unit connects output B+, the B-of described charhing unit respectively, being used to sample is recharged the charging voltage in pond, and the cut-off signals pin of described the 3rd Overvoltage protecting unit is coupled to the power control switch of charhing unit; Described the 3rd Overvoltage protecting unit is used for charging voltage VC is compared with the 3rd reference voltage V3; be used for when charging voltage VC rises above the 3rd reference voltage V3, sending the power control switch of cut-off signals Poff 2 to charhing unit; the control charhing unit automatically shuts down; wherein V3 is the 3rd reference voltage, described V3＞V2＞V1.
First Overvoltage protecting unit is in the process of battery charge; constantly detect the charging voltage that is recharged the pond; and with first reference voltage of setting relatively, when the charging voltage that is recharged the pond reaches first reference voltage of setting, rechargeable battery is carried out the ground floor protection.For preventing that single-unit charger self overvoltage crowbar from breaking down; the present invention has also designed second Overvoltage protecting unit; in the whole process of battery charge; second Overvoltage protecting unit is also constantly detecting the charging voltage that is recharged the pond; and continuous and second reference voltage comparison; when VC＞V2, send cut-off signals to charhing unit, control this charhing unit and automatically shut down charge circuit.Because second reference voltage of second Overvoltage protecting unit of setting is greater than first reference voltage, so work as first Overvoltage protecting unit just often, second Overvoltage protecting unit does not shield; When first Overvoltage protecting unit break down, when not shielding, second Overvoltage protecting unit just shields.
In order to give rechargeable battery with reliable protection more; the present invention also comprises the 3rd Overvoltage protecting unit; described the 3rd Overvoltage protecting unit is constantly sampled and is recharged the charging voltage in pond; compare with the 3rd reference voltage V3; when VC＞V3; send cut-off signals to charhing unit, control this charhing unit and automatically shut down charge circuit.Because V3＞V2＞V1, so the 3rd Overvoltage protecting unit just shields when first Overvoltage protecting unit and second Overvoltage protecting unit are all out of control.
Decision design of the present invention is: first Overvoltage protecting unit is original self Overvoltage protecting unit of charger; second Overvoltage protecting unit is to realize by the MCU that is embedded with the overvoltage protection program (microcontroller), and the 3rd Overvoltage protecting unit is to be that the over-charge protective special chip is realized by hardware.
The invention has the beneficial effects as follows: 1) the present invention is except first Overvoltage protecting unit; also increased by second Overvoltage protecting unit; under the situation that first Overvoltage protecting unit breaks down; second Overvoltage protecting unit is protected rechargeable battery; to guarantee that rechargeable battery does not overcharge, prevent security incident.2) for reliable protection more; the present invention has designed three-layer protection; three layers of Overvoltage protecting unit not only increase on reference voltage gradually; and it is also more and more reliable on implementation; second layer protection realizes by software; accuracy; reliability is good than first Overvoltage protecting unit; but software is out of control easily when being subjected to misoperation or receiving rub-out signal; and three-layer protection is realized by the overvoltage protection special chip; accuracy not only; good reliability; and overcome the program problem easily out of control that the second layer is protected, so the present invention guarantees that from the software and hardware dual mode charging process of battery is safe and reliable.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 represents the circuit diagram of the most preferred embodiment of charging circuit of the present invention;
Fig. 2 represents the charging overvoltage protection flow chart of the most preferred embodiment of charging method of the present invention;
Fig. 3 represents the circuit diagram of the most preferred embodiment of equalizing charger of the present invention.
[embodiment]
Specific embodiment one, be illustrated in figure 1 as the most preferred embodiment of charging circuit of the present invention; existing charger 5 comprises i.e. first Overvoltage protecting unit of charhing unit and self Overvoltage protecting unit; the input of charhing unit connects electric main; can connect 220VAC or 380VAC as required; through after transformation, rectification and the voltage stabilizing, its output B+, B-connect the both positive and negative polarity that is recharged the pond.The charging voltage collection terminal of charger self Overvoltage protecting unit connects output B+, B-respectively.The charging voltage collection terminal 21,22 of second Overvoltage protecting unit connects output B+, B-respectively, and the cut-off signals pin 23 that is used to produce cut-off signals Poff 1 is coupled to first input end of logic OR circuit.The charging voltage collection terminal 31,32 of the 3rd Overvoltage protecting unit connects output B+, B-respectively; the cut-off signals pin 33 that is used to produce cut-off signals Poff2 is coupled to second input terminal of logic OR circuit, and the output of logic OR circuit is coupled to the power control switch of charhing unit.
When charger self Overvoltage protecting unit detects the charging voltage during greater than the first reference voltage V1 that is recharged the pond; output control signal 11 is to charhing unit; protect being recharged the pond; make charging current very little; the charge circuit that is recharged the pond keeps a kind of dynamic equilibrium, and charging voltage maintains on the first reference voltage V1 substantially.Charger self Overvoltage protecting unit also can directly be controlled charger and be stopped charging detecting the charging voltage during greater than the first reference voltage V1 that is recharged the pond.Described second Overvoltage protecting unit can be to embed the MCU that the overvoltage protection program is arranged, and MCU carries out analog-to-digital conversion with the charging voltage that samples earlier, compares by the software and the second reference voltage V2 again, sends control signal according to comparative result; Second Overvoltage protecting unit also can be the special chip of overvoltage protection, realize overvoltage protection by hardware, for example comprise comparison circuit, the first input end response charging voltage VC of comparison circuit, second input responds the second reference voltage V2, when VC＜V2, comparison circuit is exported first level, when VC＞V2, and the comparison circuit upset, export second level, second level is that the power control switch of cut-off signals Poff1 control charhing unit turn-offs; Special chip can also be chip S-8241ABCMC4.35V/2.3V.
Described the 3rd Overvoltage protecting unit can be to embed the MCU that the overvoltage protection program is arranged equally, also can be the special chip of overvoltage protection.
The best fit mode of second Overvoltage protecting unit and the 3rd Overvoltage protecting unit is that second Overvoltage protecting unit is to embed the MCU that the overvoltage protection program is arranged, and realizes software protection; The 3rd Overvoltage protecting unit is the special chip of overvoltage protection, realizes hardware protection.
Charging flow of the present invention may further comprise the steps as shown in Figure 2:
1) charhing unit is to battery charge, the charging voltage VC of each Overvoltage protecting unit sampling battery;
2) first Overvoltage protecting unit compares the VC and the first reference voltage V1, if VC＜V1 then continues charging and sampling charging voltage, if VC＞V1, the then first Overvoltage protecting unit effect makes charhing unit keep dynamic equilibrium;
3) in case first Overvoltage protecting unit breaks down, then battery is continued charging, and each protective circuit continues the charging voltage VC that sampling is recharged the pond;
4) the second Overvoltage protecting unit MCU compares the VC and the second reference voltage V2, if VC＜V2, then continue charging and sampling charging voltage, if VC＞V2, then the second Overvoltage protecting unit MCU sends cut-off signals Poff1, export the power control switch of charhing unit after cut-off signals Poff1 and the computing of cut-off signals Poff2 logic OR to, power control switch responds this logic OR signal and automatically shuts down this charhing unit;
5) in case the second Overvoltage protecting unit MCU is out of control, then battery is continued charging, and each protective circuit continues the charging voltage VC that sampling is recharged the pond;
6) the overvoltage protection special chip compares VC and the 3rd reference voltage V3; if VC＜V3; then continue charging and sampling charging voltage; if VC＞V3; then the overvoltage protection special chip sends cut-off signals Poff2; export the power control switch of charhing unit after cut-off signals Poff2 and the computing of cut-off signals Poff1 logic OR to, power control switch responds this logic OR signal and automatically shuts down this charhing unit.
For second protective circuit can be played a protective role reliably, the relation of the second reference voltage V2 and the first reference voltage V1 is also very important, and second reference voltage is set to V2=V1+0.15V usually, and the 3rd reference voltage is set to V3=V2+0.1V.For example, the first reference voltage V1=4.1V can be set, the second reference voltage V2=4.25V, the 3rd reference voltage V3=4.35V for lithium ion battery group equalizing charge system.
Certainly, the cut-off signals pin 33 of the cut-off signals pin 23 of second Overvoltage protecting unit and the 3rd Overvoltage protecting unit can also couple directly to the power control switch of charhing unit respectively.
Specific embodiment two, in reality charging is used because each batteries capacity is all variant, therefore remedy by all filling successively, reach consistent to guarantee every batteries capacity by all filling.All filling in the process, guaranteeing every batteries charge independence, charging current is: less than 0.2C.In the existing equalizing charger; generally all has single-unit charger self overvoltage crowbar; every joint of sampling is recharged the charging voltage of battery; when the charging voltage that detects certain batteries during greater than the first reference voltage V1; single-unit charger self overvoltage crowbar is protected this batteries; make charging current very little, the charge circuit of this batteries keeps a kind of dynamic equilibrium, and charging voltage maintains on the first reference voltage V1 substantially.
Equalizing charger of the present invention comprises two or more above-mentioned charging circuits that are connected in parallel.Each single-unit charging circuit comprises two-layer Overvoltage protecting unit at least, so that when the ground floor Overvoltage protecting unit breaks down, second layer Overvoltage protecting unit continues monitoring to rechargeable battery, prevents over-charging of battery.
The most preferred embodiment of equalizing charger of the present invention is as shown in Figure 3: equalizing charger comprises the identical charging circuit that is connected in parallel of two or more (can reach 80); charging circuit comprises the single-unit charger; second Overvoltage protecting unit; the 3rd Overvoltage protecting unit; the single-unit charger comprises charhing unit; first Overvoltage protecting unit; the input of each single-unit charger is connected with the electric main source; output connects the both positive and negative polarity that is recharged the pond; second Overvoltage protecting unit and the voltage sample end of the 3rd Overvoltage protecting unit are connected the output of charhing unit respectively, and its cut-off signals pin is respectively by the logic OR which couple or couple directly to this single-unit charger.
Second Overvoltage protecting unit is the inner MCU that the over-charge protective program is arranged that embeds; in equalizing charger; for the charged state of monitoring every batteries and carry out corresponding control; design has equalizing charge management system single-chip microcomputer; equalizing charge management system single-chip microcomputer is connected with the pond of being managed that is recharged; in order to save element and space; the over-charge protective program is embedded in the equalizing charge management system single-chip microcomputer, sends the signal that turn-offs corresponding single-unit charger by software detection, judgement and control equalizing charge management system single-chip microcomputer.The charging voltage sampling pin of described equalizing charge management system single-chip microcomputer links to each other with the output of charhing unit respectively, and the cut-off signals pin is coupled to corresponding single-unit charger.Each above-mentioned equalizing charge management system single-chip microcomputer is linked together by bus, and be connected with main MCU (being host microcontroller) and be used for producing communication by CAN bus and other modules.
The 3rd Overvoltage protecting unit is the battery management chip S-8241ABCMC4.35V/2.3V of overvoltage protection special use, and the charging voltage sampling pin of this chip links to each other with the output of charhing unit respectively, and the cut-off signals pin is coupled to corresponding single-unit charger and links to each other.Connect by bus between described each lithium ion special chip S-8241ABCMC4.35V/2.3V, and is connected with main MCU and is used for by CAN bus and other modules generation communication.
The present invention protects layer by layer to rechargeable battery, and the protection of adopting software and hardware to combine of second and third protective circuit, has saved the volume of charger, and the reliability of circuit working also improves.
Claims (10)
1. charging circuit comprises:
Charhing unit: input is connected with power supply, and output (B+, B-) is respectively applied for and connects the both positive and negative polarity that is recharged the pond;
First Overvoltage protecting unit: the output (B+, B-) that connects described charhing unit respectively, be recharged the charging voltage VC in pond with sampling, compare with the first reference voltage V1, be used for transmitting control signal (11) to charhing unit when charging voltage VC rises above the first reference voltage V1, the control charhing unit stops continuing charging to being recharged the pond;
Second Overvoltage protecting unit: charging voltage sampling end (21,22) connects the output (B+, B-) of described charhing unit respectively, being used to sample is recharged the charging voltage VC in pond, and the cut-off signals pin of described second Overvoltage protecting unit is coupled to the power control switch of charhing unit; Described second Overvoltage protecting unit is used for charging voltage VC is compared with the second reference voltage V2, when charging voltage VC rises above the second reference voltage V2, send cut-off signals (Poff 1), charhing unit is automatically shut down to the power control switch of charhing unit; It is characterized in that also comprising:
The 3rd Overvoltage protecting unit: the charging voltage sampling end of described the 3rd Overvoltage protecting unit (31,32) connects the output (B+, B-) of described charhing unit respectively, being used to sample is recharged the charging voltage VC in pond, and the cut-off signals pin of described the 3rd Overvoltage protecting unit is coupled to the power control switch of charhing unit; Described the 3rd Overvoltage protecting unit is used for charging voltage VC is compared with the 3rd reference voltage V3; be used for when charging voltage VC rises above the 3rd reference voltage V3, sending the power control switch of cut-off signals (Poff 2) to charhing unit; the control charhing unit automatically shuts down described V3＞V2＞V1.
2. charging circuit as claimed in claim 1; it is characterized in that: described second Overvoltage protecting unit is the inner microcontroller that the over-charge protective program is arranged that embeds; the charging voltage sampling pin of described microcontroller links to each other with the output (B+, B-) of charhing unit respectively, and the cut-off signals pin is coupled to the power control switch of charhing unit.
3. charging circuit as claimed in claim 1; it is characterized in that: described second Overvoltage protecting unit is the overvoltage protection special chip; described chip comprises the comparison circuit that charging voltage VC and the second reference voltage V2 are compared; the signal of the cut-off signals pin output of described chip overturns according to the comparative result variation of comparison circuit, and the cut-off signals pin of described chip is coupled to the power control switch of charhing unit.
4. charging circuit as claimed in claim 2; it is characterized in that: described the 3rd Overvoltage protecting unit is the over-charge protective special chip; described chip comprises the comparison circuit that charging voltage VC and the 3rd reference voltage V3 are compared; the signal of the cut-off signals pin output of described chip overturns according to the comparative result variation of comparison circuit, and the cut-off signals pin of described chip is coupled to the power control switch of charhing unit.
5. charging circuit as claimed in claim 4; it is characterized in that: the cut-off signals pin of described second Overvoltage protecting unit and the cut-off signals pin of the 3rd Overvoltage protecting unit are by the power control switch of logic OR which couple to charhing unit; the cut-off signals pin (23) of second Overvoltage protecting unit and the cut-off signals pin (33) of the 3rd Overvoltage protecting unit are coupled respectively to the first input end and second input of described logic OR circuit, and the output of logic OR circuit is coupled to the power control switch of charhing unit.
6. charging circuit as claimed in claim 4 is characterized in that: the described second reference voltage V2=V1+0.15V, the 3rd reference voltage V3=V2+0.1V.
7. charging method may further comprise the steps:
The voltage acquisition step: to being recharged in the charging process of pond, each protective circuit sample respectively be recharged the pond charging voltage VC, wherein VC is the charging voltage that is recharged the pond;
The first protection step: will be recharged the pond the first reference voltage V1 of charging voltage VC and charger self Overvoltage protecting unit compare, when VC＜V1, continue charging, when VC＞V1, stop continuing to charge to being recharged the pond;
The second protection step: the charging voltage VC that will be recharged the pond compares with the second reference voltage V2 of second Overvoltage protecting unit, when VC＜V2, second Overvoltage protecting unit is failure to actuate, when VC＞V2, second Overvoltage protecting unit sends the power control switch of cut-off signals to charhing unit, and charhing unit is automatically shut down; It is characterized in that also comprising:
The 3rd protection step: the charging voltage VC that will be recharged the pond compares with the 3rd reference voltage V3 of the 3rd Overvoltage protecting unit; when VC＜V3; the 3rd Overvoltage protecting unit is failure to actuate; when VC＞V3; the 3rd Overvoltage protecting unit sends the power control switch of cut-off signals to charhing unit; charhing unit is automatically shut down, wherein V3＞V2＞V1.
8. charging method as claimed in claim 7; it is characterized in that: the cut-off signals of the cut-off signals of described second Overvoltage protecting unit and the 3rd Overvoltage protecting unit carried out the logic OR computing earlier before being sent to the power control switch of charhing unit, the result of logic OR computing is used for controlling the power control switch of charhing unit.
9. an equalizing charger comprises two or more identical charging circuits that are connected in parallel, and it is characterized in that: described charging circuit comprises:
Charhing unit: input is connected with power supply, and output (B+, B-) is respectively applied for and connects the both positive and negative polarity that is recharged the pond;
First Overvoltage protecting unit: the output (B+, B-) that connects described charhing unit respectively, be recharged the charging voltage VC in pond with sampling, compare with the first reference voltage V1, be used for transmitting control signal (11) to charhing unit when charging voltage VC rises above the first reference voltage V1, the control charhing unit stops continuing charging to being recharged the pond;
Second Overvoltage protecting unit: charging voltage sampling end (21,22) connects the output (B+, B-) of described charhing unit respectively, being used to sample is recharged the charging voltage VC in pond, and the cut-off signals pin of described second Overvoltage protecting unit is coupled to the power control switch of charhing unit; Described second Overvoltage protecting unit is used for charging voltage VC is compared with the second reference voltage V2, be used for when charging voltage VC rises above the second reference voltage V2, sending cut-off signals (Poff 1), charhing unit is automatically shut down to the power control switch of charhing unit; It is characterized in that also comprising:
The 3rd Overvoltage protecting unit: the charging voltage sampling end of described the 3rd Overvoltage protecting unit (31,32) connects the output (B+, B-) of described charhing unit respectively, being used to sample is recharged the charging voltage VC in pond, and the cut-off signals pin of described the 3rd Overvoltage protecting unit is coupled to the power control switch of charhing unit; Described the 3rd Overvoltage protecting unit is used for charging voltage VC is compared with the 3rd reference voltage V3; be used for when charging voltage VC rises above the 3rd reference voltage V3, sending the power control switch of cut-off signals (Poff 2) to charhing unit; the control charhing unit automatically shuts down described V3＞V2＞V1.
10. equalizing charger as claimed in claim 9, it is characterized in that: described second Overvoltage protecting unit is the inner microcontroller that the over-charge protective program is arranged that embeds, the charging voltage sampling pin of described microcontroller links to each other with the output (B+, B-) of charhing unit respectively, and its cut-off signals pin is coupled to the power control switch of charhing unit; Described the 3rd Overvoltage protecting unit is the over-charge protective special chip; described chip comprises the comparison circuit that charging voltage VC and the 3rd reference voltage V3 are compared; the signal of the cut-off signals pin output of described chip overturns according to the comparative result variation of comparison circuit, and the cut-off signals pin of described chip is coupled to the power control switch of charhing unit.
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| CNB2004100226080A CN100355181C (en) | 2004-05-18 | 2004-05-18 | A charging circuit and charging method and equalizing charger therefor |
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| CN108448681B (en) * | 2018-04-10 | 2021-09-07 | 广东力科新能源有限公司 | Charger online detection method of battery management system |
| CN111049118A (en) * | 2020-01-07 | 2020-04-21 | 珠海格力电器股份有限公司 | Overvoltage protection device and method for power utilization circuit and circuit with overvoltage protection |
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| US6014013A (en) * | 1998-12-16 | 2000-01-11 | Space Systems/Loral, Inc. | Battery charge management architecture |
| CN2514502Y (en) * | 2001-12-25 | 2002-10-02 | 深圳市比亚迪电子有限公司 | Protective circuit for chargeable cell |
| CN2598788Y (en) * | 2002-11-19 | 2004-01-14 | 比亚迪股份有限公司 | Lithium secondary battery charge-discharge management device for driving electric vehicle |
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|---|---|
| CN1700558A (en) | 2005-11-23 |
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