CN105048425A - Protection device and protection method of vehicle low-voltage power supply line - Google Patents
Protection device and protection method of vehicle low-voltage power supply line Download PDFInfo
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- CN105048425A CN105048425A CN201510503789.7A CN201510503789A CN105048425A CN 105048425 A CN105048425 A CN 105048425A CN 201510503789 A CN201510503789 A CN 201510503789A CN 105048425 A CN105048425 A CN 105048425A
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Abstract
The invention relates to a protection device and protection method of a vehicle low-voltage power supply line. The protection device comprises a lead front-end detection device and a lead tail-end detection device; the lead front-end detection device is connected in series to a power supply connecting terminal at the power supply line; the lead tail-end detection device is connected in series to a load device power supply connecting terminal at the power supply line; and the power supply line for providing power for the load device is arranged between the lead front-end detection device and the lead tail-end detection device. According to the invention, the lead front-end detection device and the lead tail-end detection device collect currents and voltages of the front end and tail end of the power supply line respectively and comparison are carried out, thereby effectively detecting the using state of the power supply line and providing short-circuit protection, overload protection, overheating protection, and electricity leakage protection for the power supply line effectively.
Description
Technical field
The present invention relates to a kind of line protective devices, particularly relate to a kind of vehicle low-voltage supply line protective device and guard method thereof.
Background technology
In existing vehicle low-voltage circuit, just string has a fuse, only has simple overcurrent protection function.When conductive line resistance values after aging circuit become large or crust damaged cause electric leakage time, electric conduction fails to be convened for lack of a quorum and wire or conductive contact place temperature is raised, and now electric current does not have the rated value of over insurance silk, and the long condition of high temperature may cause the spontaneous combustion of circuit.
Current automobile repacking is increasingly general, increases the power consumption equipments such as some lamp decorations comparatively general to the love car of oneself.The power consumption equipment increased generally all needs to increase current supply line, and the wire used in vehicle is more, and the probability gone wrong is also just relatively larger.
Summary of the invention
The object of the present invention is to provide a kind of vehicle low-voltage supply line protective device and guard method thereof, solve in prior art, vehicle supply line easily causes leaking electricity because aging circuit resistance becomes large or crust is damaged and causes the problem of security incident.
For solving the problem, the technical solution used in the present invention is:
A kind of vehicle low-voltage supply line protective device, comprise wire front-end detection device and wire end checkout gear, the power supply link of described wire front-end detection device serial connection in supply line, described wire end checkout gear is serially connected in the load equipment power connector end in supply line, is the supply line to load equipment energy supply between described wire front-end detection device and wire end checkout gear;
Described wire front-end detection device is made up of current sensing means, voltage check device, supply line's on-off switch, data processing controller and communication device, wherein said current sensing means and described supply line on-off switch are all serially connected on the circuit of power supply link, described voltage check device is connected in parallel on the circuit of power supply link, and described data processing controller is connected with current sensing means, voltage check device, supply line's on-off switch, communication device signal respectively;
Described wire end checkout gear is made up of current sensing means, voltage check device, data processing controller and communication device, wherein said current detection circuit is serially connected on the circuit of load equipment power connector end, described voltage check device is connected in parallel on the circuit of load equipment power connector end, and described data processing controller is connected with current sensing means, voltage check device, communication device signal respectively.
Further, described supply line on-off switch is P channel power MOS pipe or have can the switching tube of control switch and relay.
The guard method of a kind of vehicle low-voltage supply line, comprises the following steps:
Step one, the power supply link place serial connection wire front-end detection device in vehicle low-voltage supply line, the load equipment power connector end place serial connection wire end checkout gear in vehicle low-voltage supply line;
Step 2, described wire end checkout gear collects the current signal at load equipment power connector end place and voltage signal and is sent to wire front-end detection device;
Step 3, described wire front-end detection device collects current signal and the voltage signal at power supply link place, and compares with the current signal at the load equipment power connector end place received and voltage signal;
Step 4, after relatively, if electric current exceedes rated current or voltage difference exceedes safe threshold, wire front-end detection device then disconnects vehicle low-voltage supply line.
Further, described wire front-end detection device is made up of current sensing means, voltage check device, supply line's on-off switch, data processing controller and communication device, wherein said current sensing means and described supply line on-off switch are all serially connected on the circuit of power supply link, described voltage check device is connected in parallel on the circuit of power supply link, and described data processing controller is connected with current sensing means, voltage check device, supply line's on-off switch, communication device signal respectively; Described wire end checkout gear is made up of current sensing means, voltage check device, data processing controller and communication device, wherein said current detection circuit is serially connected on the circuit of load equipment power connector end, described voltage check device is connected in parallel on the circuit of load equipment power connector end, and described data processing controller is connected with current sensing means, voltage check device, communication device signal respectively.
Further, electric current, the voltage data of the load equipment power connector end that described data processing controller received current checkout gear and voltage check device collect, and the communication device of wire front-end detection device is transferred to by communication device, finally transfer to the data processing controller of wire front-end detection device, the electric current of the load equipment power connector end that the data processing controller of described wire front-end detection device comes according to the electric current of the power supply link collected and voltage data and the transmission of wire end checkout gear and voltage data compare judgement.
Further, the line resistance of setting wire for R, contact resistance be r, measure error be Vi, voltage difference V between described wire front-end detection and wire end detect is greater than I* (R+r)+Vi, then wire front-end detection device then disconnects vehicle low-voltage supply line.
The beneficial effect adopting technique scheme to produce is: the present invention gathers electric current and the voltage of supply line front end and end respectively by wire front-end detection device and wire end checkout gear; and compare; effectively can detect the using state of supply line, effectively can carry out short-circuit protection, overload protection, overtemperature protection, earth leakage protective to current supply line.
Accompanying drawing explanation
Fig. 1 is a kind of vehicle low-voltage supply line protective device position of the present invention installation diagram.
Fig. 2 is the circuit connection diagram of wire front-end detection device and wire end checkout gear in the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 and Fig. 2 shows an embodiment of a kind of vehicle of the present invention low-voltage supply line protective device: a kind of vehicle low-voltage supply line protective device, comprise wire front-end detection device and wire end checkout gear, the power supply link of described wire front-end detection device serial connection in supply line, described wire end checkout gear is serially connected in the load equipment power connector end in supply line, is the supply line to load equipment function between described wire front-end detection device and wire end checkout gear;
Described wire front-end detection device is made up of current sensing means, voltage check device, supply line's on-off switch, data processing controller and communication device, wherein said current sensing means and described supply line on-off switch are all serially connected on the circuit of power supply link, described voltage check device is connected in parallel on the circuit of power supply link, and described data processing controller is connected with current sensing means, voltage check device, supply line's on-off switch, communication device signal respectively;
Described wire end checkout gear is made up of current sensing means, voltage check device, data processing controller and communication device, wherein said current detection circuit is serially connected on the circuit of load equipment power connector end, described voltage check device is connected in parallel on the circuit of load equipment power connector end, and described data processing controller is connected with current sensing means, voltage check device, communication device signal respectively.
According to another embodiment of a kind of vehicle low-voltage supply line of the present invention protective device, described supply line on-off switch is P channel power MOS pipe or have can the switching tube of control switch and relay.
According to the various embodiments described above, operation principle of the present invention is: the electric current collected when described front-end detection device or difference equal with the electric current that described terminal end detecting collects does not exceed predetermined safety value, and when not exceeding the rated current allowing wire to pass through, supply line's safety, described gate-controlled switch can not be closed.
When the electric current that the electric current that described front-end detection device collects collects much larger than described terminal end detecting, difference exceedes predetermined safety value, and illustrate that there is the place of electric leakage in supply line, described gate-controlled switch can be closed.
When the electric current that described front-end detection device collects and the electric current that described terminal end detecting collects are greater than wire rated current, wire overloading is described, described gate-controlled switch can be closed.
When the voltage that described front-end detection device collects and the voltage that described terminal end detecting collects do difference its difference exceed predetermined safety value time, the large conductor overheating of resistive in wire is described, described gate-controlled switch can be closed.
An embodiment according to the guard method of a kind of vehicle of the present invention low-voltage supply line: the guard method of a kind of vehicle low-voltage supply line, comprises the following steps:
Step one, the power supply link place serial connection wire front-end detection device in vehicle low-voltage supply line, the load equipment power connector end place serial connection wire end checkout gear in vehicle low-voltage supply line;
Step 2, described wire end checkout gear collects the current signal at load equipment power connector end place and voltage signal and is sent to wire front-end detection device;
Step 3, described wire front-end detection device collects current signal and the voltage signal at power supply link place, and compares with the current signal at the load equipment power connector end place received and voltage signal;
Step 4, after relatively, if electric current exceedes rated current or voltage difference exceedes safe threshold, wire front-end detection device then disconnects vehicle low-voltage supply line.
According to a preferred embodiment of a kind of vehicle low-voltage supply line of the present invention guard method, described wire front-end detection device is by current sensing means, voltage check device, supply line's on-off switch, data processing controller and communication device are formed, wherein said current sensing means and described supply line on-off switch are all serially connected on the circuit of power supply link, described voltage check device is connected in parallel on the circuit of power supply link, described data processing controller respectively and current sensing means, voltage check device, supply line's on-off switch, communication device signal connects, described wire end checkout gear is made up of current sensing means, voltage check device, data processing controller and communication device, wherein said current detection circuit is serially connected on the circuit of load equipment power connector end, described voltage check device is connected in parallel on the circuit of load equipment power connector end, and described data processing controller is connected with current sensing means, voltage check device, communication device signal respectively.
According to another preferred embodiment of a kind of vehicle low-voltage supply line of the present invention guard method, the electric current of the load equipment power connector end that described data processing controller received current checkout gear and voltage check device collect, voltage data, and the communication device of wire front-end detection device is transferred to by communication device, finally transfer to the data processing controller of wire front-end detection device, the electric current of the load equipment power connector end that the data processing controller of described wire front-end detection device comes according to the electric current of the power supply link collected and voltage data and the transmission of wire end checkout gear and voltage data compare judgement.
According to another preferred embodiment of a kind of vehicle low-voltage supply line of the present invention guard method; the line resistance of setting wire for R, contact resistance be r, measure error be Vi; voltage difference V between described wire front-end detection and wire end detect is greater than I* (R+r)+Vi, then wire front-end detection device then disconnects vehicle low-voltage supply line.The resistance of its center line and contact resistance can be measured with universal instrument, and the resistance measured and load current value can manually be written in equipment, and equipment can calculate setting safe threshold automatically.
For U.S. AWG-10 line: resistance value is 3.36 (0hm/km), and the electric current that can pass through is 23.7A (rated current), and therefore under this electric current, the pressure reduction of every meter is 0.08V.When the conductor length of reality is 3m, under nominal current conditions, normal pressure drop is 0.24V.And the actual pressure drop obtained can slightly larger than 0.24V.The part be greater than is contact resistance Vr.The pressure reduction V=0.08L+Vr+Vi that actual measurement is arrived, now V is safe pressure differential.When pressure reduction exceedes this value, fore device can cut off electric current automatically.
The electric current of the present invention by detecting; assist protective effect; no matter whether the pressure reduction namely measured reach safe threshold; as long as measure electric current exceeded rated current will shutdown switch, meanwhile, can also former and later two current values of comparison; the pressure reduction measured may not reach safe threshold; but wire has leakage current to be not sufficient to make its total current reach load current value, but be that the large electric current below of electric current is above little certainly, at this moment want on-off switching tube equally.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and execution mode, these amendments and execution mode will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the distortion carried out building block and/or layout and improving, to those skilled in the art, other purposes also will be obvious.
Claims (6)
1. a vehicle low-voltage supply line protective device, it is characterized in that: comprise wire front-end detection device and wire end checkout gear, the power supply link of described wire front-end detection device serial connection in supply line, described wire end checkout gear is serially connected in the load equipment power connector end in supply line, is the supply line to load equipment energy supply between described wire front-end detection device and wire end checkout gear;
Described wire front-end detection device is made up of current sensing means, voltage check device, supply line's on-off switch, data processing controller and communication device, wherein said current sensing means and described supply line on-off switch are all serially connected on the circuit of power supply link, described voltage check device is connected in parallel on the circuit of power supply link, and described data processing controller is connected with current sensing means, voltage check device, supply line's on-off switch, communication device signal respectively;
Described wire end checkout gear is made up of current sensing means, voltage check device, data processing controller and communication device, wherein said current detection circuit is serially connected on the circuit of load equipment power connector end, described voltage check device is connected in parallel on the circuit of load equipment power connector end, and described data processing controller is connected with current sensing means, voltage check device, communication device signal respectively.
2. a kind of vehicle low-voltage supply line protective device according to claim 1, is characterized in that: described supply line on-off switch is P channel power MOS pipe or have can the switching tube of control switch and relay.
3. a vehicle low-voltage supply line guard method, is characterized in that comprising the following steps:
Step one, the power supply link place serial connection wire front-end detection device in vehicle low-voltage supply line, the load equipment power connector end place serial connection wire end checkout gear in vehicle low-voltage supply line;
Step 2, described wire end checkout gear collects the current signal at load equipment power connector end place and voltage signal and is sent to wire front-end detection device;
Step 3, described wire front-end detection device collects current signal and the voltage signal at power supply link place, and compares with the current signal at the load equipment power connector end place received and voltage signal;
Step 4, after relatively, if electric current exceedes rated current or voltage difference exceedes safe threshold, wire front-end detection device then disconnects vehicle low-voltage supply line.
4. a kind of vehicle low-voltage supply line according to claim 3 guard method, it is characterized in that: described wire front-end detection device is by current sensing means, voltage check device, supply line's on-off switch, data processing controller and communication device are formed, wherein said current sensing means and described supply line on-off switch are all serially connected on the circuit of power supply link, described voltage check device is connected in parallel on the circuit of power supply link, described data processing controller respectively and current sensing means, voltage check device, supply line's on-off switch, communication device signal connects, described wire end checkout gear is made up of current sensing means, voltage check device, data processing controller and communication device, wherein said current detection circuit is serially connected on the circuit of load equipment power connector end, described voltage check device is connected in parallel on the circuit of load equipment power connector end, and described data processing controller is connected with current sensing means, voltage check device, communication device signal respectively.
5. a kind of vehicle low-voltage supply line according to claim 4 guard method, it is characterized in that: the electric current of the load equipment power connector end that described data processing controller received current checkout gear and voltage check device collect, voltage data, and the communication device of wire front-end detection device is transferred to by communication device, finally transfer to the data processing controller of wire front-end detection device, the electric current of the load equipment power connector end that the data processing controller of described wire front-end detection device comes according to the electric current of the power supply link collected and voltage data and the transmission of wire end checkout gear and voltage data compare judgement.
6. a kind of vehicle low-voltage supply line guard method according to claim 3-5 any one; it is characterized in that: the line resistance of setting wire for R, contact resistance be r, measure error be Vi; voltage difference V between described wire front-end detection and wire end detect is greater than I* (R+r)+Vi, then wire front-end detection device then disconnects vehicle low-voltage supply line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510503789.7A CN105048425A (en) | 2015-08-18 | 2015-08-18 | Protection device and protection method of vehicle low-voltage power supply line |
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| CN201510503789.7A CN105048425A (en) | 2015-08-18 | 2015-08-18 | Protection device and protection method of vehicle low-voltage power supply line |
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| CN107994645A (en) * | 2017-12-21 | 2018-05-04 | 杭州普创电子有限公司 | A kind of charge protection method, device, equipment and computer-readable recording medium |
| CN108599290A (en) * | 2018-03-29 | 2018-09-28 | 珠海市魅族科技有限公司 | A kind of charge protection method, device, terminal device and storage medium |
| CN109792156A (en) * | 2016-11-26 | 2019-05-21 | 华为技术有限公司 | A kind of method and apparatus of the real-time monitoring of the case where charging link |
| CN109996064A (en) * | 2019-04-09 | 2019-07-09 | 环胜电子(深圳)有限公司 | The power protection system of camera cable |
| US20210359504A1 (en) * | 2020-05-14 | 2021-11-18 | Infineon Technologies Ag | Wire integrity check |
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