CN104836294A - Charging control method for pre-charging circuit - Google Patents
Charging control method for pre-charging circuit Download PDFInfo
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- CN104836294A CN104836294A CN201510234294.9A CN201510234294A CN104836294A CN 104836294 A CN104836294 A CN 104836294A CN 201510234294 A CN201510234294 A CN 201510234294A CN 104836294 A CN104836294 A CN 104836294A
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Abstract
The invention discloses a charging control method for a pre-charging circuit, which comprises the steps of acquiring charging current of the pre-charging circuit and the voltage difference of a relay in a sampling time period; and determining whether the voltage difference of the relay is smaller than a preset voltage value and whether the charging current is smaller than a preset current value, and if yes, pre-charging is finished. The charging control method effectively determines whether the charging process is finished through simultaneously determining the voltage difference and the charging current.
Description
Technical field
The present invention relates to recharge technique field, particularly relate to a kind of charge control method of pre-charge circuit.
Background technology
At present, carry out precharge by pre-charge circuit and mainly adopt following two kinds of modes, one is that direct attracting electric relay after busbar voltage reaches set point, another kind is attracting electric relay postpone a period of time from pre-charge circuit powers on after by detecting busbar voltage.Applicant finds that above-mentioned two kinds of methods all effectively cannot judge whether pre-charge process completes after deliberation, also cannot judge pre-charge circuit whether fault, can bring adverse effect to pre-charge process.First method busbar voltage when pre-charge circuit breaks down cannot reach set point thus controller cannot be worked; Second method pre-charge current when pre-charge circuit breaks down cannot reach set point, after time arrives, attracting electric relay can cause very large attract current, this electric current is harmful to relay, even directly can cause the adhesion of relay contacts end, so that the life-span of reduction relay.
Summary of the invention
The invention provides a kind of charge control method of pre-charge circuit, in the process of precharge, effectively can judge whether pre-charge process completes.
The invention provides a kind of charge control method of pre-charge circuit, comprising:
In pre-charge process, obtain pre-charge circuit charging current and within the sampling time voltage difference of relay;
Judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value, if judge, the voltage difference of described relay is less than voltage preset value, and described charging current is less than electric current preset value then:
Precharge completes.
Preferably, judge if described whether the voltage difference of described relay is less than voltage preset value, and the result whether described charging current is less than electric current preset value is no, then:
Judge whether the voltage difference of described relay is greater than described voltage preset value, and whether described charging current is greater than described electric current preset value, if judge, the voltage difference of described relay is greater than described voltage preset value, and described charging current is greater than described electric current preset value then:
Proceed precharge.
Preferably, described in pre-charge process, obtain pre-charge circuit charging current and within the sampling time relay voltage difference before also comprise:
When precharge starts, arrange for judging that the counting of the pre-charge circuit whether failure counter of fault starts counting after resetting;
The voltage difference of the described relay of described judgement is greater than described voltage preset value, and after described charging current is greater than the result of described electric current preset value, also comprises:
Judge whether the count value of described failure counter is greater than preset failure value, if judge, the count value of described failure counter is less than or equal to preset failure value, then:
Proceed precharge.
Preferably, judge that if described the result whether count value of described failure counter is greater than preset failure value is yes, then:
Judge pre-charge circuit fault, terminate precharge.
Preferably, if the voltage difference of the described relay of described judgement is greater than described voltage preset value, and described charging current is less than or equal to described electric current preset value; Or judge that the voltage difference of described relay is less than or equal to described voltage preset value, and described charging current is greater than described electric current preset value, then:
Arrange failure counter counting and add N, wherein N is positive integer.
Preferably, arrange described failure counter and subtract M after arrival first Preset Time, wherein M is positive integer.
Preferably, describedly judge whether the voltage difference of described relay is less than voltage preset value, and described charging current also comprises before whether being less than electric current preset value:
Judge whether precharge time is less than the second Preset Time, be more than or equal to the second Preset Time precharge time if judge:
Arrange failure counter counting and add N, wherein N is positive integer.
Preferably, describedly judge whether precharge time is less than the second Preset Time, be less than the second Preset Time precharge time if judge:
Judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value.
Preferably, described voltage preset value is 1V-5V.
Preferably, described electric current preset value is 0-0.5A.
From such scheme, the charge control method of a kind of pre-charge circuit provided by the invention, by obtain in pre-charge process pre-charge circuit charging current and within the sampling time voltage difference of relay, by judging whether voltage difference is less than voltage preset value, and whether charging current is less than electric current preset value, when meeting simultaneously, complete precharge.By judging while voltage difference and charging current, effectively can judge whether pre-charge process completes.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The charge control method flow chart of Fig. 1 a kind of pre-charge circuit disclosed in the embodiment of the present invention;
The charge control method flow chart of Fig. 2 a kind of pre-charge circuit disclosed in another embodiment of the present invention;
The charge control method flow chart of Fig. 3 a kind of pre-charge circuit disclosed in another embodiment of the present invention;
The charge control method flow chart of Fig. 4 a kind of pre-charge circuit disclosed in another embodiment of the present invention;
The charge control method flow chart of Fig. 5 a kind of pre-charge circuit disclosed in another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of charge control method of pre-charge circuit disclosed in the embodiment of the present invention, comprising:
S101, in pre-charge process, obtain pre-charge circuit charging current and within the sampling time voltage difference of relay;
S102, judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value, if then enter step S103:
S103, precharge complete.
Concrete, the operation principle of above-described embodiment is: in pre-charge process, by constantly detecting the voltage of the relay of former and later two times in sampling time, get the voltage difference of relay within the sampling time, detect the electric current flowing through pre-charge circuit simultaneously in real time, get the charging current of pre-charge circuit.Then judge whether the voltage difference of relay is less than voltage preset value, wherein, voltage preset value is the preset value pre-set according to different relays; Judge whether charging current is less than electric current preset value, wherein, electric current preset value is the preset value pre-set according to different relays simultaneously.When the voltage difference of relay is less than voltage preset value, and when the charging current of pre-charge circuit is less than electric current preset value, then judge that described pre-charge circuit completes pre-charge process.The present embodiment is in the process of precharge, by judging while voltage difference and charging current, relative in prior art, by detecting busbar voltage or time delay a period of time attracting electric relay, effectively can judge whether pre-charge process completes, and the problem that can solve because only detecting the frequent adhesive of relay that busbar voltage or time delay a period of time bring with regard to attracting electric relay, extend the useful life of relay.。
As shown in Figure 2, a kind of charge control method of pre-charge circuit disclosed in another embodiment of the present invention, comprising:
S201, in pre-charge process, obtain pre-charge circuit charging current and within the sampling time voltage difference of relay;
S202, judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value, if then enter step S203, then enters step S204 if not:
S203, precharge complete;
S204, judge whether the voltage difference of relay is greater than described voltage preset value, and whether charging current is greater than described electric current preset value, if then enter step S205:
S205, proceed precharge.
Concrete, the operation principle of above-described embodiment is: in pre-charge process, by constantly detecting the voltage of the relay of former and later two times in sampling time, get the voltage difference of relay within the sampling time, detect the electric current flowing through pre-charge circuit simultaneously in real time, get the charging current of pre-charge circuit.
Then judge whether the voltage difference of relay is less than voltage preset value, wherein, voltage preset value is the preset value pre-set according to different relays, is generally 1V-5V; Judge whether charging current is less than electric current preset value, wherein, electric current preset value is the preset value pre-set according to different relays, is generally 0-0.5A simultaneously.
When the voltage difference of relay is less than voltage preset value, and when the charging current of pre-charge circuit is less than electric current preset value, then judge that described pre-charge circuit completes pre-charge process.
When the voltage difference of relay is greater than voltage preset value, and when the charging current of pre-charge circuit is greater than electric current preset value, then judge that described pre-charge process not yet completes, control described pre-charge circuit and proceed precharge.
The present embodiment is in the process of precharge, by judging while voltage difference and charging current, by detecting busbar voltage or time delay a period of time attracting electric relay, effectively can judge whether pre-charge process completes, and the problem that can solve because only detecting the frequent adhesive of relay that busbar voltage or time delay a period of time bring with regard to attracting electric relay, extend the useful life of relay.
The present invention on the basis of above-described embodiment, also by arranging failure counter to judge whether pre-charge circuit breaks down.When precharge starts, arrange for judging that the counting of the pre-charge circuit whether failure counter of fault resets in pre-charge circuit, when pre-charge process does not meet pre-conditioned, failure counter starts counting.In pre-charge process, whether be greater than preset failure value by the counting of failure judgement counter and judge whether pre-charge circuit breaks down.Concrete, to the implementation of the control of pre-charge circuit and breakdown judge as mentioned below.
As shown in Figure 3, a kind of charge control method of pre-charge circuit disclosed in another embodiment of the present invention, comprising:
S301, when precharge starts, arrange for judging that the counting of the pre-charge circuit whether failure counter of fault starts counting after resetting;
S302, in pre-charge process, obtain pre-charge circuit charging current and within the sampling time voltage difference of relay;
S303, judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value, if then enter step S304, then enters step S305 if not:
S304, precharge complete;
S305, judge whether the voltage difference of relay is greater than described voltage preset value, and whether charging current is greater than described electric current preset value, if then enter step S306, then enters step S307 if not:
S306, proceed precharge;
S307, arrange failure counter counting add N, wherein N is positive integer;
S308, judge whether the count value of described failure counter is greater than preset failure value, if not, then enters step S306, if then enter step S309:
S309, judge pre-charge circuit fault, terminate precharge.
Concrete, the operation principle of above-described embodiment is: when precharge starts, and will be used for judging that the counting of the pre-charge circuit whether failure counter of fault starts counting after resetting.
In pre-charge process, by constantly detecting the voltage of the relay of former and later two times in sampling time, getting the voltage difference of relay within the sampling time, detecting the electric current flowing through pre-charge circuit simultaneously in real time, getting the charging current of pre-charge circuit.
Then judge whether the voltage difference of relay is less than voltage preset value, wherein, voltage preset value is the preset value pre-set according to different relays, is generally 1V-5V; Judge whether charging current is less than electric current preset value, wherein, electric current preset value is the preset value pre-set according to different relays, is generally 0-0.5A simultaneously.
When judging whether the voltage difference of relay is less than voltage preset value, and judge that result that whether charging current is less than electric current preset value is when being, then judge that described pre-charge circuit completes pre-charge process.
When the voltage difference of described relay is more than or equal to voltage preset value, and described charging current is more than or equal to electric current preset value, continues to judge whether the voltage difference of relay is greater than voltage preset value, and whether the charging current of pre-charge circuit is greater than electric current preset value.When judging whether the voltage difference of relay is greater than voltage preset value, and the result whether charging current of pre-charge circuit is greater than electric current preset value is when being, controls pre-charge circuit and proceeds precharge; When judging whether the voltage difference of relay is greater than voltage preset value, and when the result whether charging current of pre-charge circuit is greater than electric current preset value is no, arrange failure counter counting and add N, wherein N is positive integer;
In whole pre-charge process, whether the count value of real-time judge failure counter is greater than preset failure value, when judged result is no, control pre-charge circuit and proceed precharge, when judged result is for being, judge that pre-charge circuit now breaks down, control pre-charge circuit and terminate precharge.
The present embodiment is in the process of precharge, by judging while voltage difference and charging current, relative in prior art, by detecting busbar voltage or time delay a period of time attracting electric relay, effectively can judge whether pre-charge process completes, and the problem that can solve because only detecting the frequent adhesive of relay that busbar voltage or time delay a period of time bring with regard to attracting electric relay, extend the useful life of relay.Simultaneously, when judging whether the voltage difference of relay is greater than voltage preset value, whether the charging current of pre-charge circuit is greater than electric current preset value, when only having the judged result of one of them for being in these two conditions, increase the counting of failure counter, in whole pre-charge process, by the count value of real-time failure judgement counter, can judge whether pre-charge circuit breaks down in pre-charge process.
As shown in Figure 4, a kind of charge control method of pre-charge circuit disclosed in another embodiment of the present invention, comprising:
S401, when precharge starts, arrange for judging that the counting of the pre-charge circuit whether failure counter of fault starts counting after resetting;
S402, in pre-charge process, obtain pre-charge circuit charging current and within the sampling time voltage difference of relay;
S403, judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value, if then enter step S404, then enters step S405 if not:
S404, precharge complete;
S405, judge whether the voltage difference of relay is greater than described voltage preset value, and whether charging current is greater than described electric current preset value, if then enter step S406, then enters step S407 if not:
S406, proceed precharge;
S407, arrange failure counter counting add N, wherein N is positive integer;
S408, arrange described failure counter subtract M after arrival first Preset Time, wherein M is positive integer;
S409, judge whether the count value of described failure counter is greater than preset failure value, if not, then enters step S406, if then enter step S410:
S410, judge pre-charge circuit fault, terminate precharge.
Concrete, the operation principle of above-described embodiment is: when precharge starts, and will be used for judging that the counting of the pre-charge circuit whether failure counter of fault starts counting after resetting.
In pre-charge process, by constantly detecting the voltage of the relay of former and later two times in sampling time, getting the voltage difference of relay within the sampling time, detecting the electric current flowing through pre-charge circuit simultaneously in real time, getting the charging current of pre-charge circuit.
Then judge whether the voltage difference of relay is less than voltage preset value, wherein, voltage preset value is the preset value pre-set according to different relays, is generally 1V-5V; Judge whether charging current is less than electric current preset value, wherein, electric current preset value is the preset value pre-set according to different relays, is generally 0-0.5A simultaneously.
When judging whether the voltage difference of relay is less than voltage preset value, and judge that result that whether charging current is less than electric current preset value is when being, then judge that described pre-charge circuit completes pre-charge process.
When the voltage difference of described relay is more than or equal to voltage preset value, and described charging current is more than or equal to electric current preset value, continues to judge whether the voltage difference of relay is greater than voltage preset value, and whether the charging current of pre-charge circuit is greater than electric current preset value.When judging whether the voltage difference of relay is greater than voltage preset value, and the result whether charging current of pre-charge circuit is greater than electric current preset value is when being, controls pre-charge circuit and proceeds precharge.
When judging whether the voltage difference of relay is greater than voltage preset value, and the result whether charging current of pre-charge circuit is greater than electric current preset value is when being no, namely when judging whether the voltage difference of relay is greater than voltage preset value, whether the charging current of pre-charge circuit is greater than electric current preset value, when only having the judged result of one of them for being in these two conditions, arrange failure counter counting and add N, wherein N is positive integer, such as, be 1; In whole pre-charge process, when failure counter is after arrival first Preset Time, arrange failure counter counting and subtract M, wherein M is positive integer.Such as automatically subtract 1 every the first Preset Time failure counter, by arranging certainly subtracting of failure counter, part interference can be eliminated, be equivalent to filter action.
In whole pre-charge process, whether the count value of real-time judge failure counter is greater than preset failure value, when judged result is no, control pre-charge circuit and proceed precharge, when judged result is for being, judge that pre-charge circuit now breaks down, control pre-charge circuit and terminate precharge.
The present embodiment is in pre-charge process, by judging while voltage difference and charging current, relative in prior art, by detecting busbar voltage or time delay a period of time attracting electric relay, effectively can judge whether pre-charge process completes, and the problem that can solve because only detecting the frequent adhesive of relay that busbar voltage or time delay a period of time bring with regard to attracting electric relay, extend the useful life of relay.Simultaneously, when judging whether the voltage difference of relay is greater than voltage preset value, whether the charging current of pre-charge circuit is greater than electric current preset value, when only having the judged result of one of them for being in these two conditions, increase the counting of failure counter, when failure counter is after arrival first Preset Time, reduce the counting of failure counter, in whole pre-charge process, by the count value of real-time failure judgement counter, can judge whether pre-charge circuit breaks down in pre-charge process.
As shown in Figure 5, a kind of charge control method of pre-charge circuit disclosed in another embodiment of the present invention, comprising:
S501, when precharge starts, arrange for judging that the counting of the pre-charge circuit whether failure counter of fault starts counting after resetting;
S502, in pre-charge process, obtain pre-charge circuit charging current and within the sampling time voltage difference of relay;
S503, judge whether precharge time is less than the second Preset Time, if then enter step S504, then enter step S508 if not:
S504, judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value, if then enter step S505, then enters step S506 if not:
S505, precharge complete;
S506, judge whether the voltage difference of relay is greater than described voltage preset value, and whether charging current is greater than described electric current preset value, if then enter step S507, then enters step S508 if not:
S507, proceed precharge;
S508, arrange failure counter counting add N, wherein N is positive integer;
S509, arrange described failure counter subtract M after arrival first Preset Time, wherein M is positive integer;
S510, judge whether the count value of described failure counter is greater than preset failure value, if not, then enters step S507, if then enter step S511:
S511, judge pre-charge circuit fault, terminate precharge.
Concrete, the operation principle of above-described embodiment is: when precharge starts, and will be used for judging that the counting of the pre-charge circuit whether failure counter of fault starts counting after resetting.
In pre-charge process, by constantly detecting the voltage of the relay of former and later two times in sampling time, getting the voltage difference of relay within the sampling time, detecting the electric current flowing through pre-charge circuit simultaneously in real time, getting the charging current of pre-charge circuit.
In whole pre-charge process, whether the real-time time judging precharge is less than the second Preset Time, if judged result is no, namely when in whole pre-charge process, the time of precharge is greater than the second Preset Time, then arrange failure counter counting and add N, wherein N is positive integer, such as, be 1; Meanwhile, in whole pre-charge process, whether the real-time voltage difference judging relay is less than voltage preset value, and wherein, voltage preset value is the preset value pre-set according to different relays, is generally 1V-5V; Judge whether charging current is less than electric current preset value, wherein, electric current preset value is the preset value pre-set according to different relays, is generally 0-0.5A simultaneously.
When judging whether the voltage difference of relay is less than voltage preset value, and judge that result that whether charging current is less than electric current preset value is when being, then judge that described pre-charge circuit completes pre-charge process.
When judging whether the voltage difference of relay is greater than voltage preset value, and the charging current of pre-charge circuit whether be greater than electric current preset value result for being time, control pre-charge circuit and proceed precharge.
When judging whether the voltage difference of relay is greater than voltage preset value, and the result whether charging current of pre-charge circuit is greater than electric current preset value is when being no, namely when judging whether the voltage difference of relay is greater than voltage preset value, whether the charging current of pre-charge circuit is greater than electric current preset value, when only having the judged result of one of them for being in these two conditions, arrange failure counter counting and add N, wherein N is positive integer, such as, be 1; In whole pre-charge process, when failure counter is after arrival first Preset Time, arrange failure counter counting and subtract M, wherein M is positive integer.Such as automatically subtract 1 every the first Preset Time failure counter, by arranging certainly subtracting of failure counter, part interference can be eliminated, be equivalent to filter action.
In whole pre-charge process, whether the count value of real-time judge failure counter is greater than preset failure value, when judged result is no, control pre-charge circuit and proceed precharge, when judged result is for being, judge that pre-charge circuit now breaks down, control pre-charge circuit and terminate precharge.
The present embodiment is in pre-charge process, by judging while voltage difference and charging current, relative in prior art, by detecting busbar voltage or time delay a period of time attracting electric relay, effectively can judge whether pre-charge process completes, and the problem that can solve because only detecting the frequent adhesive of relay that busbar voltage or time delay a period of time bring with regard to attracting electric relay, extend the useful life of relay.
Meanwhile, when the time of precharge in whole pre-charge process is greater than the second Preset Time, increase the counting of failure counter; When judging whether the voltage difference of relay is greater than voltage preset value, and whether the charging current of pre-charge circuit is greater than electric current preset value, when only having the judged result of one of them for being in these two conditions, increase the counting of failure counter; When failure counter is after arrival first Preset Time, reduce the counting of failure counter, in whole pre-charge process, by the count value of real-time failure judgement counter, can judge whether pre-charge circuit breaks down in pre-charge process.
If the function described in the present embodiment method using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computing equipment read/write memory medium.Based on such understanding, the part of the part that the embodiment of the present invention contributes to prior art or this technical scheme can embody with the form of software product, this software product is stored in a storage medium, comprising some instructions in order to make a computing equipment (can be personal computer, server, mobile computing device or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various can be program code stored medium.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, between each embodiment same or similar part mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a charge control method for pre-charge circuit, is characterized in that, comprising:
In pre-charge process, obtain pre-charge circuit charging current and within the sampling time voltage difference of relay;
Judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value, if judge, the voltage difference of described relay is less than voltage preset value, and described charging current is less than electric current preset value then:
Precharge completes.
2. method according to claim 1, is characterized in that, judge whether the voltage difference of described relay is less than voltage preset value, and the result whether described charging current is less than electric current preset value is if described no, then:
Judge whether the voltage difference of described relay is greater than described voltage preset value, and whether described charging current is greater than described electric current preset value, if judge, the voltage difference of described relay is greater than described voltage preset value, and described charging current is greater than described electric current preset value then:
Proceed precharge.
3. method according to claim 2, is characterized in that, described in pre-charge process, obtain pre-charge circuit charging current and within the sampling time relay voltage difference before also comprise:
When precharge starts, arrange for judging that the counting of the pre-charge circuit whether failure counter of fault starts counting after resetting;
The voltage difference of the described relay of described judgement is greater than described voltage preset value, and after described charging current is greater than the result of described electric current preset value, also comprises:
Judge whether the count value of described failure counter is greater than preset failure value, if judge, the count value of described failure counter is less than or equal to preset failure value, then:
Proceed precharge.
4. method according to claim 3, is characterized in that, judges that the result whether count value of described failure counter is greater than preset failure value is yes if described, then:
Judge pre-charge circuit fault, terminate precharge.
5. method according to claim 3, is characterized in that, if the voltage difference of the described relay of described judgement is greater than described voltage preset value, and described charging current is less than or equal to described electric current preset value; Or judge that the voltage difference of described relay is less than or equal to described voltage preset value, and described charging current is greater than described electric current preset value, then:
Arrange failure counter counting and add N, wherein N is positive integer.
6. method according to claim 3, is characterized in that, arrange described failure counter and subtract M after arrival first Preset Time, wherein M is positive integer.
7. method according to claim 3, is characterized in that, describedly judges whether the voltage difference of described relay is less than voltage preset value, and described charging current also comprises before whether being less than electric current preset value:
Judge whether precharge time is less than the second Preset Time, be more than or equal to the second Preset Time precharge time if judge:
Arrange failure counter counting and add N, wherein N is positive integer.
8. method according to claim 7, is characterized in that, describedly judges whether precharge time is less than the second Preset Time, is less than the second Preset Time precharge time if judge:
Judge whether the voltage difference of described relay is less than voltage preset value, and whether described charging current is less than electric current preset value.
9. method according to claim 1, is characterized in that, described voltage preset value is 1V-5V.
10. method according to claim 1, is characterized in that, described electric current preset value is 0-0.5A.
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| CN201510234294.9A CN104836294B (en) | 2015-05-08 | 2015-05-08 | A kind of charge control method of pre-charge circuit |
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| CN201510234294.9A CN104836294B (en) | 2015-05-08 | 2015-05-08 | A kind of charge control method of pre-charge circuit |
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| CN109624788A (en) * | 2018-12-28 | 2019-04-16 | 蜂巢能源科技有限公司 | Power battery pre-charge state judges system and judgment method |
| CN114295974A (en) * | 2021-12-30 | 2022-04-08 | 上海儒竞智控技术有限公司 | Detection method and detection circuit for failure of pre-charging relay |
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| CN114295974A (en) * | 2021-12-30 | 2022-04-08 | 上海儒竞智控技术有限公司 | Detection method and detection circuit for failure of pre-charging relay |
| CN114295974B (en) * | 2021-12-30 | 2023-11-10 | 上海儒竞智控技术有限公司 | Method and circuit for detecting failure of precharge relay |
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