CN201937236U - Locking type short-circuit protection circuit in vehicle electronic system - Google Patents
Locking type short-circuit protection circuit in vehicle electronic system Download PDFInfo
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- CN201937236U CN201937236U CN201120039899XU CN201120039899U CN201937236U CN 201937236 U CN201937236 U CN 201937236U CN 201120039899X U CN201120039899X U CN 201120039899XU CN 201120039899 U CN201120039899 U CN 201120039899U CN 201937236 U CN201937236 U CN 201937236U
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- locking
- vehicle electric
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Abstract
The utility model discloses a locking type short-circuit protection circuit in a vehicle electronic system, comprising a short-circuit detection module, a short-circuit protection module and a locking unit, wherein the short-circuit detection module judges whether short-circuit occurs through detection on current of the output end of the system; the short-circuit protection module is connected with the short-circuit detection module and stops the operation of the system after short circuit occurs; and the locking unit is connected with the short-circuit protection module to maintain the normal operation of the short-circuit protection module till the system restarts. The circuit of the utility model has the advantages of simple structure, fast response and high reliability.
Description
Technical field
The utility model relates to the short-circuit protection circuit technical field, particularly relates to the locking-typed short-circuit protection circuit in a kind of vehicle electric system.
Background technology
Owing to reasons such as in the process of moving friction of automobile, vibrations; the lead short circuit may take place; this just needs short-circuit protection circuit in order to avoid the damage system; the generator voltage regulating system of automobile particularly, the single-chip voltage regulator for automobile circuit that possesses this system does not now all have short-circuit protection function.
And the short-circuit protection circuit of in some other systems of forming by discrete device, using, traditional way is to separate device with relay 102, switch 101, fuse 103 etc. to constitute as shown in Figure 1, the shortcoming of this way is the slow cost height of reaction; In addition, shield, can only bring into play direct action,, just must change in case fuse 103 is disconnected with fuse 103.
Therefore, how to design a kind of locking-typed short-circuit protection circuit that reacts in fast, the safe and reliable vehicle electric system, become one of technical barrier that current urgent need solves.
The utility model content
In view of this, the purpose of this utility model is to provide the locking-typed short-circuit protection circuit in a kind of vehicle electric system, and is simple in structure, reaction is fast, reliability is high.
Circuit described in the utility model comprises: the short-circuit detecting module, detect by output end current system, and judge whether to be short-circuited; The short-circuit protection module is connected with the short-circuit detecting module, in the operation of back halt system that is short-circuited; Lock cell is connected with the short-circuit protection module, keeps the normal operation of short-circuit protection module, restarts up to system.
In the specific embodiment, described vehicle electric system is the automobile current generator voltage-regulating system; And the locking-typed short-circuit protection circuit in the described vehicle electric system is integrated in the chip.
Described short-circuit detecting module comprises current detection circuit, and comparator, and detected current feedback signal of current detection circuit and internal reference voltage signal are compared, if current feedback signal greater than the internal reference voltage signal, then is judged as is short-circuited.
Described short-circuit protection module comprises the switch element that is connected between system input and the ground, and when being short-circuited, the switch element closure drags down the system input signal; Described lock cell comprises the rest-set flip-flop that electrify restoration circuit and clear terminal are connected with electrify restoration circuit output, and the output connection of described rest-set flip-flop is also controlled described switch element.
This circuit by lock cell will by the short-circuit detecting module detect be short-circuited after; again by the locking of the state after out of service of short-circuit protection module with system; promptly; keep system out of service always; after system restart; lock cell is just removed this state, thereby circulation repeatedly makes that this short-circuit protection circuit reaction is fast, reliability is high.In addition, this circuit and automobile current generator voltage-regulating system are integrated in the chip, no outward element, simple in structure.
Description of drawings
Fig. 1 is the block diagram of existing short-circuit protection circuit;
Fig. 2 is the block diagram of the locking-typed short-circuit protection circuit in the vehicle electric of the present utility model system;
Fig. 3 A is the concrete enforcement circuit diagram of the locking-typed short-circuit protection circuit in the vehicle electric of the present utility model system;
Fig. 3 B is a kind of enforcement circuit diagram of electrify restoration circuit POR among Fig. 3 A.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.
In view of this, the purpose of this utility model is to provide the locking-typed short-circuit protection circuit in a kind of vehicle electric system, and is simple in structure, reaction is fast, reliability is high.
See also Fig. 2, as shown in the figure, locking-typed short-circuit protection circuit in the vehicle electric of the present utility model system comprises: short-circuit detecting module 202, short-circuit protection module 203 and lock cell 204, wherein, described short-circuit detecting module 202 detects by output 201 electric currents to system 20, judges whether to be short-circuited; Short-circuit protection module 203 is connected with short-circuit detecting module 202, in the operation of back halt system 20 that is short-circuited; Lock cell 204 is connected with short-circuit protection module 203, keeps the normal operation of short-circuit protection module 203, restarts up to system.
Please in conjunction with Fig. 3 A; it is the concrete enforcement circuit diagram of the locking-typed short-circuit protection circuit in the vehicle electric of the present utility model system; as shown in the figure; described short-circuit detecting module 202 can comprise current detection circuit; and comparator 2; detected current feedback signal of current detection circuit and internal reference voltage signal are compared, be short-circuited if current feedback signal greater than the internal reference voltage signal, then is judged as.Described short-circuit protection module 203 can comprise the switch element 4 that is connected between system input and the ground, and when being short-circuited, switch element 4 closures drag down the system input signal; Described lock cell 204 can comprise the rest-set flip-flop 3 that electrify restoration circuit 1 and clear terminal are connected with electrify restoration circuit 1 output, and the output connection of described rest-set flip-flop 3 is also controlled described switch element 4.
The scheme that specifically can adopt in conjunction with the foregoing circuit components and parts: the emitter of power output NPN transistor 6 connects current feedback resistance 7, feedback resistance 7 other end ground connection, the output feedback signal of transistor 6 and feedback resistance 7 is to the positive input terminal of comparator 2, the negative input end of comparator 2 meets internal reference voltage signal Vref, the S reset terminal of the output termination rest-set flip-flop 3 of comparator 2, the R clear terminal of rest-set flip-flop 3 connects the output of electrify restoration circuit (POR) 1, and the output of rest-set flip-flop 3 connects the base stage of switch NPN transistor 4.
When current feedback signal is higher than internal reference voltage Vref, comparator 2 output high level, rest-set flip-flop 3 is output as Gao Ping, 4 conductings of switch NPN transistor, power output NPN transistor 6 is turn-offed.After having only by the time again Switching Power Supply, electrify restoration circuit 1 output one high level pulse signal, the output low level of rest-set flip-flop 3, switch NPN transistor 4 is turn-offed, and power output NPN transistor 6 states are by internal control signal (Control_Signal) decision of system input.
Need to prove that above-mentioned vehicle electric system can be the automobile current generator voltage-regulating system; And the locking-typed short-circuit protection circuit in the described vehicle electric system can with this system integration in a chip, promptly realize single chip architecture, simple in structure.
In addition, seeing also Fig. 3 B, is a kind of enforcement circuit diagram of electrify restoration circuit among Fig. 3 A, need to prove, this kind of only giving an example here implemented circuit, and other implement the function that circuit can be finished above-mentioned electrify restoration circuit equally, do not enumerate one by one here.
More than to the locking-typed short-circuit protection circuit in a kind of vehicle electric provided by the utility model system, be described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, part in specific embodiments and applications all can change.In sum, this description should not be construed as restriction of the present utility model.
Claims (6)
1. the locking-typed short-circuit protection circuit in the vehicle electric system is characterized in that, comprising:
The short-circuit detecting module detects by the output end current to system, judges whether to be short-circuited;
The short-circuit protection module is connected with the short-circuit detecting module, in the operation of back halt system that is short-circuited;
Lock cell is connected with the short-circuit protection module, keeps the normal operation of short-circuit protection module, restarts up to system.
2. the locking-typed short-circuit protection circuit in the vehicle electric according to claim 1 system is characterized in that, described vehicle electric system is the automobile current generator voltage-regulating system.
3. the locking-typed short-circuit protection circuit in the vehicle electric according to claim 1 and 2 system is characterized in that, the locking-typed short-circuit protection circuit in the described vehicle electric system is integrated in the chip.
4. the locking-typed short-circuit protection circuit in the vehicle electric according to claim 1 system; it is characterized in that; described short-circuit detecting module comprises current detection circuit; and comparator; detected current feedback signal of current detection circuit and internal reference voltage signal are compared; if greater than the internal reference voltage signal, then being judged as, current feedback signal is short-circuited.
5. the locking-typed short-circuit protection circuit in the vehicle electric according to claim 1 system; it is characterized in that described short-circuit protection module comprises the switch element that is connected between system input and the ground, when being short-circuited; the switch element closure drags down the system input signal.
6. the locking-typed short-circuit protection circuit in the vehicle electric according to claim 5 system; it is characterized in that; described lock cell comprises the rest-set flip-flop that electrify restoration circuit and clear terminal are connected with electrify restoration circuit output, and the output connection of described rest-set flip-flop is also controlled described switch element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120039899XU CN201937236U (en) | 2011-02-16 | 2011-02-16 | Locking type short-circuit protection circuit in vehicle electronic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120039899XU CN201937236U (en) | 2011-02-16 | 2011-02-16 | Locking type short-circuit protection circuit in vehicle electronic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201937236U true CN201937236U (en) | 2011-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120039899XU Expired - Fee Related CN201937236U (en) | 2011-02-16 | 2011-02-16 | Locking type short-circuit protection circuit in vehicle electronic system |
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| CN (1) | CN201937236U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520359A (en) * | 2011-12-02 | 2012-06-27 | 苏州冠硕新能源有限公司 | Battery management system and method for short circuit detection and turn-off by adopting same |
| CN105870876A (en) * | 2016-05-23 | 2016-08-17 | 深圳市蓝希领地科技有限公司 | Short-circuit protection circuit and system |
| CN110657056A (en) * | 2019-11-19 | 2020-01-07 | 江苏浩峰汽车附件有限公司 | Glow plug controller based on intelligent switching tube |
-
2011
- 2011-02-16 CN CN201120039899XU patent/CN201937236U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520359A (en) * | 2011-12-02 | 2012-06-27 | 苏州冠硕新能源有限公司 | Battery management system and method for short circuit detection and turn-off by adopting same |
| CN105870876A (en) * | 2016-05-23 | 2016-08-17 | 深圳市蓝希领地科技有限公司 | Short-circuit protection circuit and system |
| CN110657056A (en) * | 2019-11-19 | 2020-01-07 | 江苏浩峰汽车附件有限公司 | Glow plug controller based on intelligent switching tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110817 Termination date: 20160216 |