CN110690880B - Vehicle-mounted instrument circuit structure capable of realizing immediate starting after micro power-off of whole vehicle in extremely-low dark current sleep environment - Google Patents
Vehicle-mounted instrument circuit structure capable of realizing immediate starting after micro power-off of whole vehicle in extremely-low dark current sleep environment Download PDFInfo
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- CN110690880B CN110690880B CN201911021048.XA CN201911021048A CN110690880B CN 110690880 B CN110690880 B CN 110690880B CN 201911021048 A CN201911021048 A CN 201911021048A CN 110690880 B CN110690880 B CN 110690880B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
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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
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
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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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2637—Vehicle, car, auto, wheelchair
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Abstract
The invention relates to a vehicle-mounted instrument circuit structure which is started immediately after micro power-off of a whole vehicle is realized in an extremely-low dark current sleep environment, and the vehicle-mounted instrument circuit structure comprises an enabling input pin, a power supply chip and a storage battery power supply, wherein the enabling input pin is connected between the power supply chip and the storage battery power supply and is used for controlling enabling of the power supply chip through the storage battery power supply; and the diode is connected between the storage battery power supply and the Vin power supply and used for enabling the storage battery power supply to control the power supply chip through the unidirectional conductivity of the diode. By adopting the vehicle-mounted instrument circuit structure which is used for realizing the immediate start of the whole vehicle after micro power-off in the extremely low dark current sleep environment, the vehicle-mounted instrument sleeps when the dark current is very small, and does not turn a key when the power supply is restored after 1-2 seconds of power-off, and the singlechip is started by resetting the instrument without sending a message for awakening. The invention uses the power chip enable input pin, and can immediately close the output of the 5V power supply as long as the enable input end is at low level, thereby solving the new problem that the instrument is immediately started after power failure and recovery under the condition of low dark current dormancy.
Description
Technical Field
The invention relates to the field of automobile electronic control, in particular to the field of automobile combination instrument power supply design, and specifically relates to a vehicle-mounted instrument circuit structure which can be started immediately after micro power-off of a whole automobile in an extremely-low dark current sleep environment.
Background
At present, the dark current of the vehicle-mounted instrument is required to be higher and higher in the whole vehicle factory, and even the requirement of reaching within 1mA is proposed. The purpose can be achieved through the selection of the power supply chip and the system optimization design, but a new problem is brought, and the smaller the dark current is, the smaller the storage battery micro-power-off recovery mode is, the single chip microcomputer cannot recover to start from the dormancy.
The reason that the traditional combination meter can meet the network requirement of the whole automobile factory is often that the dark current requirement is low. Only 3mA/12V or 5mA/24V is typically required. The dark current is large, and the voltage can rapidly drop to reach the reset threshold after the storage battery is in power failure.
The single chip microcomputer has two methods for starting from dormancy. One is wake-up source wakeup and the other is reset startup. Because the load consumption is small, the 5V voltage does not drop and the total power supply is recovered. At this point the meter is neither getting an external wake-up signal nor being able to reach a reset condition and therefore cannot start.
The reset chip must be enabled when the voltage crosses a threshold of less than 5V. If the input voltage is not changed by 5V, the reset signal output is not triggered
The precondition that the power supply chip normally works and outputs 5V drop generally has to be that the input voltage is less than 7V. Because the vehicle electrical environment is severe, the instrument needs strong power supply filtering capability, and a large capacitor needs to be hung at an input end (24V), which generally exceeds 470uF, so that the contradiction is more prominent in the vehicle-mounted instrument. After the total power is cut off, a large energy storage device exists, so that the dropping speed of a 24V power supply system is very slow, and the threshold 7V voltage value of the output dropping of the power supply chip can be reached after a long time.
Network testing in a host factory has special requirements that the instrument can work and normally receive and send messages when the power supply of the storage battery is required to be recovered after being disconnected for 3 seconds.
In the prior art, the structure of a power supply input circuit is shown in figures 1 and 2, and only 1mA current is supplied to a battery power supply + after an instrument is dormant. After the disconnection, the 24V voltage drops too slowly due to the large capacitance on VIN, so that 5V cannot be reset without change for a long time. The singlechip is not reset and is not awakened, so that the effect of powering on again and starting immediately can not be achieved when the singlechip is asleep continuously. And the whole vehicle requires that CAN messages are sent out at the moment. Thus, the requirements cannot be satisfied. The reset circuit of the prior art outputs a reset signal whenever the input voltage is greater than 4.63V, as shown in fig. 3. The waveform effect diagram of the prior art is shown in fig. 4. The blue line is a main power supply network, and the yellow line is 5V output of the power supply chip. The voltage of 5V fluctuates after 18 seconds of total power loss. There is an opportunity to reset after 19 seconds. The 5V output will be turned off only if the total power supply drops to a certain extent. This problem has been compounded by the inability of the meter to recover from hibernation after a longer period of outage, not just a minor outage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a vehicle-mounted instrument circuit structure which is high in efficiency, simple in structure and wide in application range and can be started immediately after the micro power-off of the whole vehicle is realized in an extremely low dark current sleep environment.
In order to achieve the purpose, the vehicle-mounted instrument circuit structure which realizes the immediate start of the whole vehicle after micro power-off in the extremely low dark current sleep environment has the following structure:
this realize vehicle-mounted instrument circuit structure that whole car immediately starts after cutting off the power supply a little under extremely low dark current dormancy environment, circuit structure is including consecutive storage battery power, Vin power, power chip and singlechip, its key feature is, circuit structure including enabling the input foot, connect between power chip and storage battery power for enable through storage battery power control power chip.
Preferably, the circuit structure further comprises a diode, wherein the diode is connected between the storage battery power supply and the Vin power supply and used for enabling the storage battery power supply to control the enabling of the power supply chip through the unidirectional conductivity of the diode.
Preferably, the circuit structure further comprises a reset chip connected between the power supply chip and the single chip for outputting a reset signal under the condition that the voltage is abnormally reduced.
Preferably, the enable input pin stops outputting when being at a low level.
By adopting the vehicle-mounted instrument circuit structure which is used for realizing the immediate start of the whole vehicle after micro power-off in the extremely low dark current sleep environment, the vehicle-mounted instrument sleeps when the dark current is very small, and does not turn a key when the power supply is restored after 1-2 seconds of power-off, and the singlechip is started by resetting the instrument without sending a message for awakening. The invention uses the power chip enable input pin, and the output of the 5V power supply can be immediately closed as long as the enable input end is at low level. The end voltage of the front end of the power chip is not required to be lower than 7V, and the one-way conduction performance of the diode is used for controlling the enabling pin of the power chip by the storage battery power network at the front end of the diode so as to achieve the final purpose. The novel problem that the instrument is started immediately after power failure and recovery under the condition of low dark current dormancy is solved.
Drawings
Fig. 1 is a schematic diagram of a power input circuit in the prior art.
Fig. 2 is a schematic circuit diagram of a power chip in the prior art.
Fig. 3 is a diagram of a reset circuit of the prior art.
Fig. 4 is a diagram of waveform effects of the prior art.
Fig. 5 is a schematic diagram of a power input circuit structure in a vehicle-mounted instrument circuit structure for realizing immediate startup after micro power-off of a whole vehicle in an extremely low dark current sleep environment.
Fig. 6 is a schematic diagram of a power chip circuit structure in a vehicle-mounted instrument circuit structure for realizing immediate startup after micro power-off of the whole vehicle in an extremely low dark current sleep environment.
Fig. 7 is a waveform effect diagram of a circuit structure of a vehicle-mounted instrument which is started immediately after micro power-off of the whole vehicle is realized in an extremely low dark current sleep environment.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The vehicle-mounted instrument circuit structure for realizing the immediate start of the whole vehicle after the micro power-off in the extremely-low dark current sleep environment comprises a storage battery power supply, a Vin power supply, a power chip and a single chip microcomputer which are sequentially connected, wherein an enabling input pin is connected between the power chip and the storage battery power supply and used for controlling the enabling of the power chip through the storage battery power supply.
As a preferred embodiment of the invention, the circuit structure further comprises a diode, wherein the diode is connected between the storage battery power supply and the Vin power supply and used for enabling the storage battery power supply to control the enabling of the power supply chip through the unidirectional conductivity of the diode.
As a preferred embodiment of the present invention, the circuit structure further includes a reset chip connected between the power supply chip and the single chip for outputting a reset signal when the voltage is abnormally decreased.
In a preferred embodiment of the present invention, the power supply chip stops outputting when the enable input pin is at a low level.
In the specific implementation mode of the invention, the vehicle-mounted instrument sleeps when dark current is very small, and after 1-2 seconds of power failure, a key is not turned when a power supply is restored, and the single chip microcomputer is reset and started by the instrument without sending a message for awakening.
The storage battery power supply refers to a storage battery power supply of a whole vehicle, and is connected to an instrument connector through a wire harness. The Vin power supply refers to the power supply from the battery power supply to the connector after entering the inside of the instrument. Vin is the internal meaning. The power supply is generally a power supply of a storage battery power supply after being filtered by a large capacitor. In the prior art, a storage battery power supply and a Vin power supply are directly connected, and a diode is connected between the two power supply networks in series.
As shown in fig. 5, the circuit structure of the present invention satisfies the following three conditions at the same time:
1. the input pin is enabled using the power chip. The output of the 5V power supply can be turned off immediately as long as the enable input terminal is low. It is not necessary to wait until the power chip front end voltage is lower than 7V. Whether the system is reset depends on whether the output of the 5V power supply is less than 4.63V.
2. And selecting an input enabling end. It is not acceptable if only the VIN power network is used to divide the voltage. Since the voltage drop speed is still very slow due to the large capacitance E2, a control terminal that cannot be affected by the large capacitance E2 must be used for the total power supply voltage division strategy. The invention uses a method of dividing a storage battery power supply and a VIN power supply network, uses the storage battery power supply to control the enabling of a power supply chip, and has a circuit structure as shown in figure 6.
3. The original reset chip is used, and the reset signal can be output as long as the voltage of 5V is abnormally reduced
The core of the invention is to string a diode between VIN and the power connector. The one-way conduction performance of the diode is used, and the battery power supply network at the front end of the diode is used for controlling an enabling pin of the power supply chip to achieve the final purpose.
At the moment, the large capacitance of the instrument does not influence the enabling control end any more. The return flow path of the white arrows of fig. 6 does not occur. So that the 5V output is already turned off when the voltage of VIN is also slowly dropping. After the main power supply is recovered, a reset signal can be sent out to start the instrument singlechip. Although the anti-interference capability of the finished automobile power supply directly used by the enabling control end is poor, the power supply chip can be prevented from being turned off accidentally by setting a method far larger than an enabling threshold value.
After the voltage of the control end resistor is divided, the control enable pin can ensure that the voltage is far greater than the enable threshold voltage of the power chip under the condition of normal work of 16V-32V by arranging two resistors. Meanwhile, the low-frequency filter is added without influence on the low frequency.
The waveform effect diagram of the invention is shown in fig. 6, the blue line is the battery power supply voltage, and the yellow line is the 5V voltage output by the power supply chip. It can be seen that the external power supply drops rapidly without delay, and 5V voltage drops obviously after the total power supply is turned off for more than 1 second. A reset may be triggered after the main power supply is restored. It can be seen from the figure that the reset start of the single chip microcomputer can be ensured by re-charging the battery power supply after the power failure for 1 second.
The specific embodiment of the invention in a 7 inch TFT meter is as follows:
(1) using the VIN bus to control the power chip enable pin attempts to turn off the 5V output in the event of a drop in the bus, but this alternative fails because the 5V power cannot be turned off through the EN enable pin of the power chip due to the large capacitance on VIN.
(2) A diode is connected between VIN and a power connector in series, and the one-way conduction performance of the diode is used to control the enabling pin of the power chip by the storage battery voltage power supply network at the front end of the diode, so as to achieve the final purpose. At the moment, the large capacitance of the instrument does not influence the enabling control end any more.
The two points are used in instrument products at the same time, which is an innovative point of the design and solves the new problem that the instrument is started immediately after power failure and recovery under the condition of low dark current dormancy.
By adopting the vehicle-mounted instrument circuit structure which is used for realizing the immediate start of the whole vehicle after micro power-off in the extremely low dark current sleep environment, the vehicle-mounted instrument sleeps when the dark current is very small, and does not turn a key when the power supply is restored after 1-2 seconds of power-off, and the singlechip is started by resetting the instrument without sending a message for awakening. The invention uses the power chip enable input pin, and the output of the 5V power supply can be immediately closed as long as the enable input end is at low level. The end voltage of the front end of the power chip is not required to be lower than 7V, and the one-way conduction performance of the diode is used for controlling the enabling pin of the power chip by the storage battery power network at the front end of the diode so as to achieve the final purpose. The novel problem that the instrument is started immediately after power failure and recovery under the condition of low dark current dormancy is solved.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (2)
1. A circuit structure of a vehicle-mounted instrument for realizing immediate start after micro power-off of a whole vehicle in an extremely low dark current sleep environment comprises a storage battery power supply, a Vin power supply, a power chip and a single chip microcomputer which are sequentially connected, wherein the Vin power supply refers to a power supply filtered by a large capacitor after the storage battery power supply enters the inside of the instrument through a connector;
the circuit structure also comprises a diode, wherein the diode is connected between the storage battery power supply and the Vin power supply and is used for enabling the storage battery power supply to control the enabling of the power supply chip through the unidirectional conductivity of the diode;
and when the enable input pin is at a low level, the power supply chip stops outputting.
2. The vehicle-mounted instrument circuit structure capable of being started immediately after micro power-off of the whole vehicle in the extremely low dark current sleep environment according to claim 1, wherein the circuit structure further comprises a reset chip connected between the power supply chip and the single chip microcomputer and used for outputting a reset signal under the condition that the voltage is abnormally reduced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911021048.XA CN110690880B (en) | 2019-10-25 | 2019-10-25 | Vehicle-mounted instrument circuit structure capable of realizing immediate starting after micro power-off of whole vehicle in extremely-low dark current sleep environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911021048.XA CN110690880B (en) | 2019-10-25 | 2019-10-25 | Vehicle-mounted instrument circuit structure capable of realizing immediate starting after micro power-off of whole vehicle in extremely-low dark current sleep environment |
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| CN110690880A CN110690880A (en) | 2020-01-14 |
| CN110690880B true CN110690880B (en) | 2021-11-26 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6037676A (en) * | 1998-08-03 | 2000-03-14 | Foree; Richard V | Electrical current measuring and circuit breaking device |
| EP1810887A2 (en) * | 2006-01-20 | 2007-07-25 | Fujitsu Ten Limited | Vehicle control unit and vehicle control method |
| CN101578203A (en) * | 2007-01-23 | 2009-11-11 | 欧陆汽车有限责任公司 | Device, system and method for reducing the consumption of closed-circuit current of a motor vehicle |
| CN205791486U (en) * | 2016-05-27 | 2016-12-07 | 浙江吉利控股集团有限公司 | A kind of switch controlling device being automatically prevented from vehicle feed |
| CN108173422A (en) * | 2018-01-24 | 2018-06-15 | 深圳市朗仁科技有限公司 | The anti-point sparking reset circuit of vehicular data acquisition box |
-
2019
- 2019-10-25 CN CN201911021048.XA patent/CN110690880B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6037676A (en) * | 1998-08-03 | 2000-03-14 | Foree; Richard V | Electrical current measuring and circuit breaking device |
| EP1810887A2 (en) * | 2006-01-20 | 2007-07-25 | Fujitsu Ten Limited | Vehicle control unit and vehicle control method |
| CN101578203A (en) * | 2007-01-23 | 2009-11-11 | 欧陆汽车有限责任公司 | Device, system and method for reducing the consumption of closed-circuit current of a motor vehicle |
| CN205791486U (en) * | 2016-05-27 | 2016-12-07 | 浙江吉利控股集团有限公司 | A kind of switch controlling device being automatically prevented from vehicle feed |
| CN108173422A (en) * | 2018-01-24 | 2018-06-15 | 深圳市朗仁科技有限公司 | The anti-point sparking reset circuit of vehicular data acquisition box |
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| CN110690880A (en) | 2020-01-14 |
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