CN101207301A - Heat switching method for vehicle load - Google Patents
Heat switching method for vehicle load Download PDFInfo
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- CN101207301A CN101207301A CNA2006101701131A CN200610170113A CN101207301A CN 101207301 A CN101207301 A CN 101207301A CN A2006101701131 A CNA2006101701131 A CN A2006101701131A CN 200610170113 A CN200610170113 A CN 200610170113A CN 101207301 A CN101207301 A CN 101207301A
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Abstract
The invention relates to a vehicle heat-switching method, which is characterized in that vehicle heat-switching method is used for switching a vehicle power-source system and a standby power-source system. The invention includes the steps that first the vehicle power-source system is provided with a first power source, and the first power source is outputted to a vehicle computer device through a first switch unit, and then the voltage of the vehicle power-source system is detected for whether the sudden decrease of the voltage happens; if the sudden decrease of the voltage happens, the first switch unit is closed to block the output of the first power source; in addition, a second switch unit is opened to connect the backup power source provided by the standby power-source system for the vehicle computer device. Therefore, the invention can realize the direct-switching between the vehicle power-source system and the standby power-source system according to the voltage of the vehicle power-source system through controlling the on-off of the first switch unit and the second switch unit.
Description
Technical field
The present invention relates to a kind of hot change-over method, particularly a kind of heat switching method for vehicle load that is used to switch the different electrical power system.
Background technology
Because the quick growth of automobile industry, in development now, many high-tech electronic products and outfit in the script automobile, have been added, though be in manufacturing, encapsulation, design or the relevant car of car dress product chips electronic installation as: multimedia video product, monitoring arrangement even to LED Related product and global positioning system (GPS) etc., huge business opportunity is all arranged, and this makes auto electronic become one of development in future key project.But what auto electronic was emphasized is safe and stable, and authenticated time is also very long relatively, and this is different with product speed and update cycle that present electronics industry is stressed.
Yet, Vehicular power system is that the auto electronic most critical also is one of the most basic important document, vehicle computing machine or relevant auto electronic ancillary equipment must provide main power supply source by Vehicular power system in running, but when vehicle-mounted fooled engine start, please refer to Fig. 1, variation in voltage schematic diagram for the known technology Vehicular power system, it can produce the electric current of approximate short circuit because of the moment of engine start, cause the voltage of Vehicular power system to have the phenomenon generation of bust and produce the unsettled situation of power supply, for example: reduce to (about 3.6V) below the 4V from voltage 12.6V moment originally, and about 2 seconds time such as need is just returned to the required minimum voltage of enough supply vehicle electronic devices (about 11V) again.And also just therefore, any vehicle electronic device can lose efficacy and cause electronic equipment to produce the phenomenon that moment closes and restart because of the moment of vehicle power under open state, thereby caused the damage of electronic equipment easily.
Therefore, being that the uninterruptible power system (UPS) of can arranging in pairs or groups on vehicle-mounted reaches the effect of voltage stabilizing output on the present settling mode, damage the vehicle computing machine with the instability that prevents vehicle power.But in this mode, uninterruptible power system must be finished the effect of voltage stabilizing by at least one group of voltage stabilizing circuit, therefore on hardware designs will the higher element cost of generation, and the voltage stabilizing circuit of uninterruptible power system must be in opening always could be when the power-fail that Vehicular power system provided, in time make the processing in source fully is provided, and this just can reduce the usefulness of Vehicular power system and the current sinking that increases uninterruptible power system.Therefore with present settling mode, in vehicle power supply, management and control, still have its further space of improvement.
Summary of the invention
In view of this, technical problem to be solved by this invention is, by simple circuit design, come the keying of control circuit switch element with the switch of control loop, and can directly switch use different electrical power system, and then reach the purpose that the vehicle computing machine is exported in voltage stabilizing in the mode of hot-swap.
In order to address the above problem, according to scheme proposed by the invention, a kind of heat switching method for vehicle load is provided, it is characterized in that, be used for switching use one Vehicular power system and a standby power system, its step comprises: at first, provide one first power supply by Vehicular power system, and export first power supply to the vehicle computing machine via one first switch element, whether the voltage that then detects Vehicular power system produces bust, if this voltage produces bust, then closes first switch element to block the output of first power supply, in addition, opening a second switch unit uses to the vehicle computing machine with the stand-by power supply that the conducting standby power system is provided.Therefore, can reach the purpose that Vehicular power system and standby power system are used in hot-swap by the keying of control first switch element and second switch unit.
Below, in conjunction with specific embodiments and shown in accompanying drawing, the present invention is described in further detail.
Description of drawings
Fig. 1 is the variation in voltage schematic diagram of known technology Vehicular power system;
Fig. 2 is the embodiment calcspar of vehicle mounted hot-swap device of the present invention; And
Fig. 3 is the embodiment flow chart of heat switching method for vehicle load of the present invention.
[reference numeral explanation]
Vehicle mounted hot-swap device 1
Standby power system 10
Vehicular power system 2
First switch element 20
Vehicle computing machine 3
Second switch unit 30
Voltage detection unit 40
Comparison circuit 41
Resistance circuit 42
Filter unit 50
Circuit protection unit 60
Embodiment
Please refer to Fig. 2, embodiment calcspar for vehicle mounted hot-swap device of the present invention, as shown in the figure, the invention provides a kind of vehicle mounted hot-swap device 1, it is applied between a Vehicular power system 2 and the vehicle computing machine 3, wherein, vehicle computing machine 3 for example can be for car dress computer (Car PC), industrial computer or or even with the driving computer of car collocation etc.And the fervent device 1 of vehicle mounted comprises: a standby power system 10, one first switch element 20, a second switch unit 30 and a voltage detection unit 40, standby power system 10 is all types of storage battery, be used to provide a stand-by power supply, and first switch element 20 is electrically connected at Vehicular power system 2, is used for switch one first power supply of the Vehicular power system 2 vehicle computing machine 3 that offers originally; In addition, second switch unit 30 is electrically connected at standby power system 10, is used for the output of switch stand-by power supply, can offer 3 runnings of vehicle computing machine when losing efficacy in first power supply moment to use.Wherein first switch element 20 and second switch unit 30 can be merely to utilize at least one thyristor (as: metal oxide semiconductor field effect is answered transistor MOSFET) (figure does not show) to design on hardware designs, also can for example be the designs that is realized first switch element 20 and second switch unit 30 by same switching chip (figure does not show).
And voltage detection unit 40 is used to detect the voltage of Vehicular power system 2, and control the keying of first switch element 20 and second switch unit 30 at any time in real time according to the difference of this voltage, and then switch first power supply and stand-by power supply only to allow one of them offer vehicle computing machine 3 simultaneously.Expression is just started moment or running intermittent variation of vehicle when voltage detection unit 40 detects Vehicular power system 2 at car engine, and make when Vehicular power system 2 has voltage die to take place, just can close first switch element 20 to block the supply of first power supply, make stand-by power supply be supplied to vehicle computing machine 3 smoothly and change unlatching second switch unit 30 simultaneously into, when Vehicular power system 2 recovered the regular supply burning voltage by the time, switching to Vehicular power system 2 originally again provided first power supply to vehicle computing machine 3 via first switch element 20.What deserves to be mentioned is: above-mentioned change action need not be closed any power source system and can directly be carried out the action of hot-swap.
And in voltage detection unit 40, can further comprise a comparison circuit 41 and a resistance (RC) circuit 42, the voltage bust whether that detects Vehicular power system 2 is finished in the comparison that a reference voltage that makes voltage detection unit 40 be provided by comparison circuit 41 carries out voltage; And the time of delay that resistance circuit 42 opens and closes in order to the exchange of mating first switch element 20 and second switch unit 30 for voltage detection unit 40.
In addition; vehicle mounted hot-swap device 1 more can further comprise: a filter unit 50 and a circuit protection unit 60; wherein filter unit 50 is for being electrically connected between Vehicular power system 2 and the voltage detection unit 40; when exporting first power supply, disturb the noise that produces in order to filtering Vehicular power system 2 because of engine; to avoid voltage detection unit 40 when detecting the voltage of Vehicular power system 2, to produce the situation of erroneous judgement; and on hardware designs, filter unit 50 is filter element such as inductor or capacitor for example.And circuit protection unit 60 is electrically connected between the output and vehicle computing machine 3 of first switch element 20 and second switch unit 30; to detect the unusual of first power supply or stand-by power supply; and then produce a cut-off signals and close first switch element 20 and second switch unit 30; and get rid of the back in this unusual situation of detecting and recover to open first switch element 20 and second switch unit 30; wherein this unusual situation can for example be the situation that short circuit or overcurrent take place; and close first switch element 20 and second switch unit 30 mainly in order to block first power supply and stand-by power supply continue provide; avoiding each position element in the vehicle mounted hot-swap device 1 can't bear the output of super-high-current and to damage, and more can further protect the fail safe of vehicle computing machine 3.
Please refer to Fig. 3, embodiment flow chart for heat switching method for vehicle load of the present invention, as shown in the figure, the invention provides a kind of heat switching method for vehicle load, be used to switch Vehicular power system 2 and standby power system 10, its step comprises: at first, preestablish and open first switch element 20 and close second switch unit 30 (S301), and then make Vehicular power system 2 that first power supply is provided, and the output of first power supply is used (S303) to be supplied to vehicle computing machine 3 via first switch element 20.Then, provide voltage detection unit 40 whether to produce bust (S305) with the voltage that detects Vehicular power system 2 by one of them comparison circuit 41, wherein comparison circuit 41 provides a reference voltage whether to be lower than this reference voltage and to produce bust with the voltage that compares Vehicular power system 2, if the testing result of step (S305) is for being, the voltage of expression Vehicular power system 2 may be for example causes voltage that the situation of moment bust is arranged because of the startup of car engine, just can close first switch element 20 to block first power supply (S307) this moment, and open second switch unit 30 simultaneously and continue to use (S309) with the stand-by power supply that conducting standby power system 10 is provided to vehicle computing machine 3, with this problem that remedies the unstable of moment first power supply or lost efficacy.And in step (S309) afterwards, repeat step (S305) detecting the voltage condition of Vehicular power system 2 at any time, and then judge whether Vehicular power system 2 has recovered the regular supply power supply.
If the testing result of step (S305) is for denying, the voltage of expression Vehicular power system 2 there is no the situation that produces bust and can supply stable power, this moment, just but execution in step (S303) directly provided first power supply to vehicle computing machine 3 by Vehicular power system 2 with under first situation that switch element 20 is opened and second switch unit 30 is closed constantly.
And in said method; more can provide a circuit protection unit 60 for example; whether produce unusual situation to monitor first power supply or stand-by power supply at any time; wherein this unusual situation can for example be the situation that short circuit or overcurrent take place; and if produce unusual situation; circuit protection unit 60 is just in time closed first switch element 20 and second switch unit 30 and is not damaged with protective circuit, and etc. abnormal case just recover to open first switch element 20 and second switch unit 30 after removing to continue normal operation.
Thus, voltage condition according to Vehicular power system 2, to control the keying of first switch element 20 and second switch unit 30, and then Vehicular power system 2 or standby power system 10 are used in switching, and do not need directly to carry out closing under any power source system, to reach the holding function of hot-swap.
In sum, the present invention not only need not pass through voltage stabilizing circuit, and directly control to reach the effect of voltage stabilizing output as switch by thyristor, can save the element cost of hardware designs, more have when in first power supply and the stand-by power supply one when opening, another group is just closed fully, must open always and increase the problem of power consumption stream with the voltage stabilizing circuit of avoiding similar uninterruptible power system, and therefore also can increase the usefulness of Vehicular power system 2 indirectly.And under the advantage low at cost, that power consumption stream is low and usefulness is high, be more suitable for using in the system or device of vehicle mounted.
Claims (8)
1. a heat switching method for vehicle load is characterized in that, is used for switching using a Vehicular power system and a standby power system, and its step comprises:
One first switch element is provided, is used to control one first power supply to the vehicle computing machine that this Vehicular power system provides;
One second switch unit is provided, is used to control a stand-by power supply that this standby power system provides to this vehicle computing machine;
Whether the voltage that detects this Vehicular power system produces bust; And
Control the keying of this first switch element and this second switch unit;
Wherein, by controlling the keying of this first switch element and this second switch unit, switch and use this Vehicular power system and this standby power system.
2. heat switching method for vehicle load as claimed in claim 1 is characterized in that, whether the voltage of described this Vehicular power system of detection produces bust is the comparison of carrying out voltage by a comparison circuit.
3. heat switching method for vehicle load as claimed in claim 2 is characterized in that, it is that this voltage is lower than the reference voltage that this comparison circuit provides that the voltage of described Vehicular power system produces bust.
4. heat switching method for vehicle load as claimed in claim 1 is characterized in that, when the voltage of this Vehicular power system produces bust, then closes this first switch element and opens this second switch unit.
5. heat switching method for vehicle load as claimed in claim 1 is characterized in that, when the voltage of this Vehicular power system does not produce bust, then opens this first switch element and closes this second switch unit.
6. heat switching method for vehicle load as claimed in claim 1 is characterized in that, further comprises:
Default this first switch element of unlatching is also closed this second switch unit; And
Provide a circuit protection unit whether to produce unusual situation to monitor this first power supply or this stand-by power supply.
7. heat switching method for vehicle load as claimed in claim 6 is characterized in that, if produce this unusual situation, then closes this first switch element and this second switch unit.
8. heat switching method for vehicle load as claimed in claim 6 is characterized in that, described unusual situation is the situation that short circuit or overcurrent take place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101701131A CN101207301A (en) | 2006-12-22 | 2006-12-22 | Heat switching method for vehicle load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101701131A CN101207301A (en) | 2006-12-22 | 2006-12-22 | Heat switching method for vehicle load |
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| Publication Number | Publication Date |
|---|---|
| CN101207301A true CN101207301A (en) | 2008-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101701131A Pending CN101207301A (en) | 2006-12-22 | 2006-12-22 | Heat switching method for vehicle load |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841184A (en) * | 2010-03-12 | 2010-09-22 | 英华达（南京）科技有限公司 | Power supply switching device and method thereof |
| CN101888114A (en) * | 2010-07-14 | 2010-11-17 | 朱光怀 | Multifunctional power supply of vehicular automotive electronic device |
| US8217530B2 (en) | 2009-06-30 | 2012-07-10 | O2Micro, Inc | System for managing power based on current monitoring |
| CN104412480B (en) * | 2012-07-06 | 2017-08-29 | 日立汽车系统株式会社 | Vehicle-mounted supply unit |
| CN114204788A (en) * | 2022-02-17 | 2022-03-18 | 苏州浪潮智能科技有限公司 | Power supply circuit |
-
2006
- 2006-12-22 CN CNA2006101701131A patent/CN101207301A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8217530B2 (en) | 2009-06-30 | 2012-07-10 | O2Micro, Inc | System for managing power based on current monitoring |
| CN101841184A (en) * | 2010-03-12 | 2010-09-22 | 英华达（南京）科技有限公司 | Power supply switching device and method thereof |
| CN101888114A (en) * | 2010-07-14 | 2010-11-17 | 朱光怀 | Multifunctional power supply of vehicular automotive electronic device |
| CN101888114B (en) * | 2010-07-14 | 2013-03-27 | 朱光怀 | Multifunctional power supply of vehicular automotive electronic device |
| CN104412480B (en) * | 2012-07-06 | 2017-08-29 | 日立汽车系统株式会社 | Vehicle-mounted supply unit |
| US9932003B2 (en) | 2012-07-06 | 2018-04-03 | Hitachi Automotive Systems, Ltd. | In-vehicle power supply apparatus |
| CN114204788A (en) * | 2022-02-17 | 2022-03-18 | 苏州浪潮智能科技有限公司 | Power supply circuit |
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Open date: 20080625 |