CN104977858A - Control method of vehicle-mounted electronic device turn-on and turn-off - Google Patents
Control method of vehicle-mounted electronic device turn-on and turn-off Download PDFInfo
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- CN104977858A CN104977858A CN201410135009.3A CN201410135009A CN104977858A CN 104977858 A CN104977858 A CN 104977858A CN 201410135009 A CN201410135009 A CN 201410135009A CN 104977858 A CN104977858 A CN 104977858A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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Abstract
A control method of vehicle-mounted electronic device turn-on and turn-off is characterized in that a turn-on voltage and a turn-off voltage of an electronic device are set as V1 and V2 respectively; the voltage of a vehicle-mounted power supply is detected; when the electronic device is in a turn-off state, and the voltage of the vehicle-mounted power supply exceeds V1, the electronic device is turned on; and when the electronic device is in a turn-on state and the voltage of the vehicle-mounted power supply is less than V2, the electronic device is turned off. When the voltage of the vehicle-mounted power supply is detected, a double voltage detection circuit is used. The control method of the present invention can avoid the problem that the device may be turned on and turned off continuously and automatically on a single voltage detection condition and when the voltage of the power supply is exactly nearby a detection voltage, protects the vehicle-mounted electronic device, and enables a security coefficient to be improved. Moreover, a circuit can be composed of the discrete devices, is low in cost, and facilitates the production.
Description
Technical field
The present invention relates to vehicle power detect, particularly a kind of according to vehicle power twin voltage testing result to the control method of vehicle electronic device switching on and shutting down.
Background technology
Automobile power source there will be the too low or too high abnormal voltage of supply voltage in the situations such as igniting, throw load; thus may vehicle electronic device be damaged; in order to avoid on-vehicle information amusement equipment are damaged, need to detect abnormal voltage and to on-vehicle information amusement equipment circuit take protect corresponding measure.
What vehicle carried power voltage testing circuit common was at present taked is the method that univoltage detects, such as the switching on and shutting down voltage detecting point of on-vehicle information amusement equipment is set to 9V, when voltage opens equipment from low toward when rising to 9V, when voltage is from high toward turn-off apparatus when dropping to 9V, but due to the existence of line loss, when supply voltage is just near 9V, this design then there will be the problem of the continuous automatic switching of equipment.
Summary of the invention
In view of this, the technical problem to be solved in the present invention be to provide a kind of low cost, the control method of the onboard system facility switching machine of the problem that can solve the continuous automatic switching of on-vehicle information amusement equipment.
For solving the problems of the technologies described above, technical scheme provided by the invention is: a kind of control method of vehicle electronic device switching on and shutting down, the start voltage of electronic equipment and shutdown voltage are set to V1 and V2, detect the voltage of vehicle power, when system equipment in the power-offstate, when vehicle carried power voltage is more than V1, electronic equipment is started shooting; When electronic equipment is under open state, when vehicle carried power voltage is lower than V2, electronic equipment shuts down.
Preferably, twin voltage testing circuit is adopted when detecting the voltage of vehicle power, described twin voltage testing circuit input end connects on-vehicle battery jointly, output terminal is connected to the main control chip according to the switching on and shutting down of testing result control system equipment jointly, comprise two the voltage detecting paths be made up of respectively triode T1 and T2, the detection path be made up of triode T1 comprises the testing circuit that multiple divider resistance and triode T1 form the voltage V1 that starts shooting, the described detection path be made up of triode T2 comprises the testing circuit of the shutdown voltage V2 that multiple divider resistance and triode T2 form.
Preferably, described triode T1 and T2 is NPN type triode.
Preferably, the divider resistance that the base stage of described triode T1 consists of resistance R4, R6 is connected to cell input terminal BATTERY, the collector of described triode T1 is connected to the normal power supply of circuit by a resistance R5, the collector of described triode T1 is connected to supply voltage and detects output terminal BAT_DET, the base stage of described triode T2 connects supply voltage by the divider resistance of resistance R1, R2 composition and detects output terminal BAT_DET, and the collector of described triode T2 passes through the base stage of a resistance R3 connecting triode T1.
Compared with prior art, tool of the present invention has the following advantages:
The invention provides a kind of control method of vehicle electronic device switching on and shutting down, the start voltage of electronic equipment and shutdown voltage are set to V1 and V2, detect the voltage of vehicle power, when system equipment in the power-offstate, when vehicle carried power voltage is more than V1, electronic equipment is started shooting; When electronic equipment is under open state; when vehicle carried power voltage is lower than V2; electronic equipment shuts down; can avoid under univoltage detection case when supply voltage just when detecting near voltage equipment may occur that the problem of continuous automatic switching occurs; protect vehicle electronic device, improve safety coefficient, and this circuit can be made up of discrete device; cost is low, is beneficial to production.
Accompanying drawing explanation
Fig. 1 is the particular circuit configurations schematic diagram of the embodiment of the present invention.
Embodiment
The present invention to be explained in further detail below in conjunction with accompanying drawing and embodiment for the ease of it will be appreciated by those skilled in the art that.
Embodiment
A kind of control method of vehicle electronic device switching on and shutting down, the start voltage of electronic equipment and shutdown voltage are set to V1 and V2, V1 is set to 9.5V by the present embodiment, V2 is set to 9.0V, then the voltage of vehicle power is detected, when system equipment in the power-offstate, when vehicle carried power voltage is more than 9.5V, system equipment start shooting; When system equipment is under open state, when vehicle carried power voltage is lower than 9.0V, system equipment shuts down.
Twin voltage testing circuit is as shown in Figure 1 adopted when detecting the voltage of vehicle power, described twin voltage testing circuit input end connects on-vehicle battery jointly, output terminal is connected to the main control chip controlling electronic equipment machine according to testing result jointly, comprise two the voltage detecting paths be made up of respectively triode T1 and T2, the detection path be made up of triode T1 comprises the testing circuit that multiple divider resistance and triode T1 form the voltage V1 that starts shooting, the described detection path be made up of triode T2 comprises the testing circuit of the shutdown voltage V2 that multiple divider resistance and triode T2 form.
Twin voltage testing circuit as shown in Figure 1, comprise two NPN triode T1 and T2 and realize two-line voltage synthesis, the base stage of described triode T1 is connected to cell input terminal BATTERY by a resistance R6, the collector of described triode T1 is connected to supply voltage test side BAT_DET, the grounded emitter of described triode T1, the base stage of described triode T2 is connected with supply voltage test side BAT_DET by a resistance R1, the collector of described triode T2 is connected to cell input terminal BATTERY by a resistance R3 and resistance R6, described triode T2 grounded emitter.The base stage of described triode T1 is also by a resistance R4 ground connection, and the collector of described triode T1 is also connected to the normal power supply source of circuit by a resistance R5.The base stage of described triode T2 is also by a resistance R2 ground connection.
Twin voltage testing circuit as shown in Figure 1, BATTERY end is connected to on-vehicle battery positive pole, and+V is the normal power supply source of battery BATTERY after the step-down of vehicle electronic device internal circuit, voltage stabilizing.When battery is lower than start voltage V1 ,+V makes the complete conducting of T2 through R1, R2 dividing potential drop, and C, E voltage across poles of T2 is shorted to ground close to 0V, R3; Cell voltage BATTERY is not enough to make T1 conducting through the branch pressure voltage of R6, R3//R4, and BAT_DET is high level, controls vehicle electronic device and remain on off-mode when main control chip detects that BAT_DET is high level.
When BATTERY rises to start voltage V1, cell voltage BATTERY makes T1 conducting through the branch pressure voltage of R6, R3//R4, C, E voltage across poles of T1 is close to 0V, BAT_DET becomes the low level close to 0V, at this moment T2 cut-off, R3 is unsettled, and BATTERY still keeps T1 conducting through the branch pressure voltage of R6, R4, controls vehicle electronic device and be in open state when main control chip detects that BAT_DET is low level.
When BATTERY drops to start voltage V1, BATTERY still can keep T1 conducting through the branch pressure voltage of R6, R4, BAT_DET is still the low level close to 0V, controls vehicle electronic device and be still in open state when main control chip detects that BAT_DET is low level; When cell voltage BATTERY continues to drop to shutdown voltage V2, BATTERY is not enough to make T1 conducting through the branch pressure voltage of R6, R4, T1 ends, at this moment+V makes the complete conducting of T2 through R1, R2 dividing potential drop, C, E voltage across poles of T2 is close to 0V, R3 is shorted to ground, and BATTERY is still not enough to make T1 conducting through the branch pressure voltage of R6, R3//R4, controls vehicle electronic device and be in off-mode when main control chip detects that BAT_DET is high level.
The present embodiment is the method that twin voltage detects by original univoltage detection improvement; according to the actual value such as line loss, starup current, switching on and shutting down are detected voltage and be set to different magnitudes of voltage; can avoid under univoltage detection case when supply voltage just when detecting near voltage equipment may occur that the problem of continuous automatic switching occurs; protect vehicle electronic device; improve safety coefficient; and this circuit can be made up of discrete device, cost is low, is beneficial to production.
Be more than wherein specific implementation of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.
Claims (4)
1. the control method of vehicle electronic device switching on and shutting down, it is characterized in that: the start voltage of electronic equipment and shutdown voltage are set to V1 and V2, detect the voltage of vehicle power, when electronic equipment in the power-offstate, when vehicle carried power voltage is more than V1, system equipment is started shooting; When electronic equipment is under open state, when vehicle carried power voltage is lower than V2, system equipment shuts down.
2. the control method of vehicle electronic device switching on and shutting down according to claim 1, it is characterized in that: when detecting the voltage of vehicle power, adopt twin voltage testing circuit, described twin voltage testing circuit input end connects on-vehicle battery jointly, output terminal is connected to the main control chip controlling electronic equipment machine according to testing result jointly, comprise two the voltage detecting paths be made up of respectively triode T1 and T2, the detection path be made up of triode T1 comprises the testing circuit that multiple divider resistance and triode T1 form the voltage V1 that starts shooting, the described detection path be made up of triode T2 comprises the testing circuit of the shutdown voltage V2 that multiple divider resistance and triode T2 form.
3. the control method of vehicle electronic device switching on and shutting down according to claim 2, is characterized in that: described triode T1 and T2 is NPN type triode.
4. the control method of vehicle electronic device switching on and shutting down according to claim 3, it is characterized in that: the base stage of described triode T1 is by resistance R4, the divider resistance of R6 composition is connected to cell input terminal BATTERY, the collector of described triode T1 is connected to the normal power supply of circuit by a resistance R5, the collector of described triode T1 is connected to supply voltage and detects output terminal BAT_DET, the base stage of described triode T2 is by resistance R1, the divider resistance of R2 composition connects supply voltage and detects output terminal BAT_DET, the collector of described triode T2 passes through the base stage of a resistance R3 connecting triode T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410135009.3A CN104977858B (en) | 2014-04-04 | 2014-04-04 | A kind of control method of vehicle electronic device switching on and shutting down |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410135009.3A CN104977858B (en) | 2014-04-04 | 2014-04-04 | A kind of control method of vehicle electronic device switching on and shutting down |
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| CN104977858A true CN104977858A (en) | 2015-10-14 |
| CN104977858B CN104977858B (en) | 2017-12-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054705A (en) * | 2016-06-12 | 2016-10-26 | 江苏辰汉电子科技有限公司 | Multifunctional vehicle-mounted center console starting circuit |
| CN107977067A (en) * | 2017-12-21 | 2018-05-01 | 上海寰果信息科技有限公司 | A kind of mobile unit system automatic switching protective device |
| CN110031692A (en) * | 2018-01-10 | 2019-07-19 | 厦门雅迅网络股份有限公司 | A kind of auxiliary mobile unit accurately identifies the method and circuit of ACC state |
| CN111301313A (en) * | 2020-02-26 | 2020-06-19 | 北京嘀嘀无限科技发展有限公司 | A protection device and on-vehicle electronic equipment for on-vehicle electronic equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054705A (en) * | 2016-06-12 | 2016-10-26 | 江苏辰汉电子科技有限公司 | Multifunctional vehicle-mounted center console starting circuit |
| CN107977067A (en) * | 2017-12-21 | 2018-05-01 | 上海寰果信息科技有限公司 | A kind of mobile unit system automatic switching protective device |
| CN110031692A (en) * | 2018-01-10 | 2019-07-19 | 厦门雅迅网络股份有限公司 | A kind of auxiliary mobile unit accurately identifies the method and circuit of ACC state |
| CN110031692B (en) * | 2018-01-10 | 2023-07-21 | 厦门雅迅网络股份有限公司 | Method and circuit for assisting vehicle-mounted equipment in accurately identifying ACC (active control) state |
| CN111301313A (en) * | 2020-02-26 | 2020-06-19 | 北京嘀嘀无限科技发展有限公司 | A protection device and on-vehicle electronic equipment for on-vehicle electronic equipment |
| CN111301313B (en) * | 2020-02-26 | 2022-05-06 | 北京嘀嘀无限科技发展有限公司 | A protection device and on-vehicle electronic equipment for on-vehicle electronic equipment |
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| Publication number | Publication date |
|---|---|
| CN104977858B (en) | 2017-12-22 |
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Address after: 516006 Guangdong city of Huizhou province Huizhou Zhongkai high tech Zone and five West Road No. 103 Applicant after: HUIZHOU DESAY SV AUTOMOTIVE CO., LTD. Address before: 516006 Guangdong city of Huizhou province Huizhou Zhongkai high tech Zone and five West Road No. 103 Applicant before: Huizhou Desay SV Auto. Electronics Co., Ltd. |
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