CN111865281B - Startup and shutdown control circuit of automobile ADAS equipment - Google Patents
Startup and shutdown control circuit of automobile ADAS equipment Download PDFInfo
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- CN111865281B CN111865281B CN202010496392.0A CN202010496392A CN111865281B CN 111865281 B CN111865281 B CN 111865281B CN 202010496392 A CN202010496392 A CN 202010496392A CN 111865281 B CN111865281 B CN 111865281B
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Classifications
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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
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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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
- H03K17/28—Modifications for introducing a time delay before switching
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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
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/284—Modifications for introducing a time delay before switching in field effect transistor switches
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Abstract
The invention provides a startup and shutdown control circuit of automobile ADAS equipment, wherein a VSYS end is connected with the ADAS equipment, a VCC12V end is connected to an automobile storage battery for normal electricity, an ACC12V end is connected to an ACC control switch of the automobile, a VCC3V3 end is connected to a power supply of an ADAS equipment main control chip, the VSYS end is connected with the VCC12V end through a PMOS pipe, a grid electrode of the PMOS pipe is connected with the VCC12V end through a 5 th resistor and grounded through a third NMOS pipe, a grid electrode of the third NMOS pipe is connected with the ACC12V end through a 4 th resistor, a 3 rd diode and a 9 th resistor, and a capacitor and the 12 th resistor are connected between the grid electrode of the third NMOS pipe and a grounding end in parallel. The control circuit triggers the starting up and delay shutdown through the automobile ACC.
Description
Technical Field
The design relates to the technical field of automobile electronics, in particular to an on-off control circuit of automobile ADAS equipment.
Background
In the fields of automobile assisted driving and automatic driving, ADAS refers to an advanced driving assistance system (ADVANCED DRIVER ASSISTANCE SYSTEM), and ADAS devices include binocular cameras and the like. The technology of performing environment sensing only through a single camera is more and more difficult to meet the requirement of complex road condition detection, and along with the development of sensor technology and machine vision technology, more and more image processing devices based on double-path cameras (hereinafter referred to as binocular cameras) are developed, target detection is performed based on parallax algorithm, parallax images are analyzed to obtain obstacle information, and the technology is mainly applied to the field of intelligent automobiles at present.
In the prior art, two main control modes of turning on/off the automobile are available at present, one is to connect with the automobile VCC (normal electricity), so long as the storage battery is electrified, the circuit will always have electricity, and the equipment on the circuit will always consume electricity. The other is connected with the automobile ACC, and the automobile ACC circuit is powered by the ACC directly, and only after an automobile key is pulled to an ACC gear, the automobile ACC circuit can be powered. When the ACC is powered down, the devices on its path will be powered down immediately. These two modes have the following defects: connecting the automobile VCC can cause the circuit to consume electricity all the time; the connection of the automobile ACC can be immediately powered off after the ACC is powered off, and the power off can not be controlled by the ADAS equipment according to the situation of the ADAS equipment, so that the situations of data loss, hardware equipment damage and the like can be possibly caused.
Disclosure of Invention
The invention aims to provide a startup and shutdown control circuit of automobile ADAS equipment, which can use an automobile ACC for startup and shutdown signals, can trigger startup and can delay shutdown.
According to the on-off control circuit of the automobile ADAS equipment, a VSYS end is connected with the ADAS equipment, a VCC12V end is connected to an automobile storage battery for normal electricity, an ACC12V end is connected to an ACC control switch of the automobile, a VCC3V3 end is connected to a power supply of an ADAS equipment main control chip, the VSYS end is connected with the VCC12V end through a PMOS tube, a grid electrode of the PMOS tube is connected with the VCC12V end through a 5 th resistor and grounded through a third NMOS tube, a grid electrode of the third NMOS tube is connected with the ACC12V end through a4 th resistor, a 3 rd diode and a 9 th resistor, and a capacitor and the 12 th resistor are connected between the grid electrode of the third NMOS tube and a grounding end in parallel.
The ACC_Detect signal end and the SW_Down signal end are connected to an I/O pin of an ADAS equipment main control chip, the ACC_Detect signal end is grounded through a first NMOS pipe, a grid electrode of the first NMOS pipe is connected with an ACC12V end through a4 th resistor and a 6 th resistor and grounded through a 7 th resistor, and the ACC_Detect signal end is also connected with a VCC3V3 end through a1 st resistor.
The capacitor is grounded through a fourth NMOS (N-channel metal oxide semiconductor) at the joint of the capacitor and the grid electrode of the third NMOS tube, the grid electrode of the fourth NMOS tube is connected with the SW_Down signal end and grounded through an 8 th resistor, and the capacitor and the 2 nd voltage stabilizing diode are connected between the grid electrode of the third NMOS tube and the grounding end in parallel.
Wherein the grid voltage of the first NMOS tube is larger than the threshold value, the voltage calculation formula is as follows, ACC is ACC12V end voltage, R4, R6, R7, R9 and R12 are resistance values of corresponding resistors,
Wherein the grid voltage of the third NMOS tube is larger than the threshold value, the voltage calculation formula is as follows, ACC is ACC12V end voltage, R4, R6, R7, R9 and R12 are resistance values of corresponding resistors,
Further, the button_detect signal end and the power_hold signal end are connected to an I/O pin of an ADAS equipment main control chip in a signal mode, one end of a key is grounded, the other end of the key is connected with a grid electrode of a PMOS tube through a2 nd diode, the other end of the key is connected with a VCC12V end through a2 nd resistor, the 1 st diode is connected with the button_detect signal end, the 1 st diode is connected with a VCC3V end through a1 st diode and a 3 rd resistor, the grid electrode of the PMOS tube is grounded through a second NMOS tube, and the grid electrode of the second NMOS tube is connected with the power_hold signal end and grounded through an 11 th resistor.
In the on-off control circuit, one or more NMOS tubes can be replaced by NPN type triodes, and PMOS tubes can be replaced by relays.
The on-off control circuit as described above, wherein the ADAS device may be a binocular camera.
The beneficial effects of the invention include:
The invention adopts a control mode of combining automobile ACC and VCC, the power supply is from VCC, the ACC is used for control, and the ACC does not power the equipment. Even if the ACC is powered off, the device can not be powered off immediately, the device itself controls the power supply condition (delayed power down) preferentially, enough time is reserved for the ADAS device to execute the power-off operation, and the direct power down is prevented from damaging the hardware device.
The manual key control on-off function is added, on-off operation can be manually realized under the condition that ACC triggering is not available, initial debugging and maintenance of equipment are facilitated, and convenience in operation in a laboratory test debugging stage or a loading installation debugging stage is ensured.
And a passive device is adopted, so that the circuit structure is simple.
The resistance and capacitance of the resistor in the circuit can be adjusted according to the requirements, so that the shutdown time threshold of ADAS equipment can be reasonably adjusted, a 12V/24V automobile power supply system can be easily adapted, and the flexibility is higher.
The invention is particularly suitable for an automobile binocular camera, and provides an on-off control circuit of the automobile binocular camera. The control method can solve the problems of the control mode of the automobile binocular camera device in the prior art.
Drawings
Fig. 1 is a circuit diagram of embodiment 1 of the present invention.
List of elements:
resistors R1-R9, R11, R12;
A capacitor C1;
A PMOS tube Q1;
NMOS transistors Q2 to Q5;
Diodes D1 to D3;
the zener diodes D4, D6;
Button S1
Detailed Description
Embodiments of the present invention are described below with reference to the accompanying drawings.
As shown in fig. 1, embodiment 1 of the present invention is shown. The VSYS terminal is connected with the ADAS equipment to control the switching on and switching off of the ADAS equipment, and the switching on and switching off of the ADAS equipment are performed when the voltage of the VSYS terminal is high and the switching off of the VSYS terminal is low.
The VCC12V terminal is connected to the normal electricity of the automobile storage battery. The ACC12V terminal is connected to the ACC control switch of the car. The VCC3V3 end is connected to the power supply of ADAS equipment main control chip, and normally after the ADAS equipment is normally started, the VCC3V3 end has voltage.
The ACC_detection signal end, the button_detection signal end, the power_Hold signal end and the SW_Down signal end are connected to an I/O pin of the ADAS device master control chip.
VSYS end is connected VCC12V end through PMOS pipe Q1. The grid electrode 1PIN of the PMOS tube Q1 is connected with the VCC12V end through a resistor R5 and grounded through an NMOS tube Q4. The gate 1PIN of the NMOS transistor Q4 is connected with the capacitor C1. The capacitor C1 is connected with the end of ACC12V through a resistor R4, a diode D3 and a resistor R9.
The ACC_Detector signal end is grounded through an NMOS tube Q2, a grid electrode 1PIN of the NMOS tube Q2 is connected with an ACC12V end through resistors R4 and R6 and grounded through a resistor R7, and the grid electrode 1PIN of the NMOS tube Q2 is grounded through a zener diode D4 to provide stable voltage for the grid electrode 1 PIN. The acc_detect signal terminal is also connected to the VCC3V3 terminal through a resistor R1.
The capacitor C1 is grounded through the NMOS tube Q5 at the connection part with the grid electrode 1PIN of the NMOS tube Q4, and the grid electrode 1PIN of the NMOS tube Q5 is connected with the SW_Down signal end and grounded through the resistor R8. The capacitor C1, the resistor R12 and the zener diode D6 are connected in parallel between the gate 1PIN of the NMOS transistor Q4 and the ground terminal. The capacitor C1 is connected with the end of the ACC12V through a resistor R4, a diode D3 and a resistor R9.
One end of the key S1 is grounded. The other end of the key S1 is connected with a grid electrode 1PIN of the PMOS tube Q1 through a diode D2, connected with a VCC12V end through a resistor R2, connected with a button_detection signal end through the diode D1, and connected with a VCC3V end through the diode D1 and a resistor R3.
The grid electrode 1PIN of the PMOS tube Q1 is grounded through the NMOS tube Q3, and the grid electrode 1PIN of the NMOS tube Q3 is connected with the power_Hold signal end and grounded through a resistor R11.
As an example, the resistances R1 to R9, R11, and R12 are all 100K; the capacitance C1 is 10Uf;
the control process of the circuit is as follows:
ACC triggered power on
The VCC12V end in the circuit is connected to the normal electricity of the automobile storage battery. The ACC12V terminal is connected to an ACC control switch of the car, the car is not firing, the VCC12V terminal voltage is 12V, and the ac 12V terminal voltage is 0. Because the grid electrode 1PIN of the PMOS tube Q1 is pulled up to the VCC12V end through the resistor R5, the PMOS tube Q1 is cut off, the voltage of the VSYS end is 0, and the ADAS equipment is started without being electrified. When the automobile ignites, the voltage of the end ACC12V is equal to 12V, and the end ACC12V charges the capacitor C1 through the resistor R4, the diode D3 and the resistor R9. In the charging process of the capacitor C1, the voltage of the gate 1PIN of the NMOS transistor Q4 gradually increases, and when the voltage is higher than the threshold Vgs of the NMOS transistor Q4, the NMOS transistor Q4 is turned on, and the voltage of the drain 3PIN of the NMOS transistor Q4 is 0, so that the voltage of the gate 1PIN of the PMOS transistor Q1 is 0. So the PMOS tube Q1 is conducted, the voltage of the VSYS end is 12V, and the ADAS equipment is powered on. Meanwhile, the ACC12V end is divided by the resistors R4, R6 and R7, the grid electrode 1PIN of the NMOS tube Q2 is high, the NMOS tube Q2 is on, the ACC_Detector signal end is low level, and the ADAS equipment master control detects that the ACC is electrified at the moment.
ACC triggered shutdown
When the voltage of the end of the ACC12V is changed from 12V to 0, due to the existence of the capacitor C1, the internal charge of the capacitor C1 is discharged through the resistor R12, and a certain time is required to reduce the voltage of the two ends of the capacitor C1 to the cut-off voltage of the NMOS tube Q4, so that after the ACC is powered down, the NMOS tube Q4 is required to be turned off, and the PMOS tube Q1 is turned off, so that the ADAS equipment is powered off. The process is a hardware forced power-down process, and delay power-down is realized.
The larger the resistance of the resistor R12, the larger the capacitance of the capacitor C1, the longer the discharge time, and the slower the voltage drop of the grid electrode 1PIN of the NMOS tube Q4. The turn-off time of the NMOS tube Q4 is correspondingly adjusted by adjusting the resistance value of the resistor R12 and the capacitance value of the capacitor C1, so that the turn-off time threshold of the ADAS device is adjusted.
When the ACC is powered Down, the voltage of the ACC12V end is 0, the grid electrode 1PIN of the NMOS tube Q2 is low, the NMOS tube Q2 is cut off, the ACC_detection signal end is pulled up to the VCC3V3 end through the resistor R1 and is at a high level of 3.3V, the main control of the ADAS device detects that the ACC is powered Down at the moment, shutdown preparation operations such as starting and storing are started, and the SW_Down signal end is pulled up after the completion, the NMOS tube Q5 is conducted, so that the capacitor C1 is rapidly discharged, the ADAS device is rapidly powered Down, and the shutdown waiting time is reduced.
Key-triggered start-up
The VCC12V end in the circuit is connected to the normal electricity of the automobile storage battery. The ACC12V terminal is connected to an ACC control switch of the car, the car is not firing, the VCC12V terminal voltage is 12V, and the ac 12V terminal voltage is 0. At this time, the key S1 is pressed, the low level is turned on, and the gate 1PIN voltage of the PMOS transistor Q1 is made to be 0 through the diode D2. So the PMOS tube Q1 is conducted, the voltage of the VSYS end is 12V, and the ADAS equipment is powered on. After the Power-on, the ADAS device master control pulls the power_Hold signal end high, so that the NMOS tube Q3 is conducted, at the moment, even if the key S1 is released (the 1 st PIN of the diode D2 is connected with the high level of the VCC12V end, but due to the unidirectional action of the diode, the voltage cannot influence the 2 nd PIN voltage of the diode D2), the grid 1PIN voltage of the PMOS tube Q1 still keeps 0, the PMOS tube Q1 is continuously conducted, the voltage of the VSYS end is kept to be 12V, and the ADAS device is continuously powered on.
Key-triggered shutdown
After the system is started, the Button S1 is pressed for a long time, the button_detect signal terminal is pulled down, when the low level reaches the designated time (the designated time is defined in advance), the ADAS equipment master control judges that the system is in shutdown operation, after shutdown preparation operations such as saving and the like are completed, the power_hold signal terminal is pulled down directly, so that the NMOS tube Q3 is turned off, the PMOS tube Q1 is turned off, and the ADAS equipment is powered off.
The above embodiment 1 of the present invention is based on the vehicle battery voltage of 12V. At present, most of small-sized automobiles adopt 12V power supply systems, and most of medium-sized automobiles adopt 24V power supply systems. The application of the invention is not limited to 12V power supply systems, but can also be applied to 24V power supply systems, wherein VCC12V terminal, ACC12V terminal will be 24V.
When the power supply system is suitable for a 24V power supply system, the circuit structure is unchanged, and only the size of the resistor is required to be adjusted. The resistors R1, R2, R3, R5, R8 and R11 are pull-up and pull-down resistors, and the change of the resistance value has no obvious influence on the whole function. Only the resistances R4, R6, R7, R9, R12 are affected. The on condition of the NMOS transistor Q2 is that the gate 1PIN voltage is greater than its threshold Vgs (the device characteristic parameters of the NMOS transistor Q2, different device parameters are different). The calculation formula of the grid electrode 1PIN voltage of the NMOS tube Q2 is as follows (assuming that D3 is an ideal device), wherein ACC is the voltage of the 12V end of ACC, 12V is used for a 12V power supply system, 24V is used for a 24V power supply system, and R4, R6, R7, R9 and R12 are the resistance values of corresponding resistors.
When the ACC is changed to 24V, the threshold Vgs of the NMOS tube Q2 is unchanged, and the resistance values of the resistors R4, R6, R7, R9 and R12 are required to be adjusted according to a formula so that the grid 1PIN voltage of the NMOS tube Q2 is larger than the threshold Vgs, and the detection of whether the ACC is electrified or not by the ADAS equipment main control is realized.
The on condition of the NMOS transistor Q4 is that the gate 1PIN voltage thereof is greater than the threshold Vgs thereof (the device characteristic parameter of the NMOS transistor Q4). The calculation formula of the grid electrode 1PIN voltage of the NMOS tube Q4 is as follows, wherein ACC is the voltage of an ACC12V end, 12V is used for a 12V power supply system, 24V is used for a 24V power supply system, and R4, R6, R7, R9 and R12 are the resistance values of corresponding resistors.
As can be seen from the above formula, the on state of the NMOS transistor Q4 is related to the resistance values of the resistors R4, R6, R7, R9, R12, the ACC terminal voltage, and the threshold Vgs of the NMOS transistor Q4. When ACC is changed to 24V, the threshold value Vgs is unchanged, and the resistance values of the resistors R4, R6, R7, R9 and R12 are required to be adjusted according to a formula so that the grid 1PIN voltage of the NMOS tube Q4 is larger than the threshold value Vgs, the NMOS tube Q4 is conducted, the PMOS tube Q1 is conducted, and the power-on and power-on of ADAS equipment are realized.
The voltage stabilizing diode D6 in the circuit can ensure that the switching-on and switching-off time can be consistent under the requirements of different 12V/24V power supply equipment. And simultaneously, the NMOS tube Q4 can be prevented from being broken down.
In addition, in the specific implementation, those skilled in the art may perform device replacement, for example, NMOS transistors Q2, Q3, Q4, and Q5 may be replaced with NPN transistors, and PMOS transistor Q1 may be replaced with a relay or the like.
The above embodiments are only preferred embodiments of the present invention, and it is intended that the common variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the scope of the present invention.
Claims (6)
1. The on-off control circuit of the automobile ADAS equipment is characterized in that a VSYS end is connected with the ADAS equipment, a VCC12V end is connected to an automobile storage battery for normal electricity, an ACC12V end is connected to an ACC control switch of the automobile, a VCC3V3 end is connected to a power supply of a main control chip of the ADAS equipment, the VSYS end is connected with the VCC12V end through a PMOS tube (Q1), a grid (1 PIN) of the PMOS tube (Q1) is connected with the VCC12V end through a 5 th resistor (R5) and grounded through a third NMOS tube (Q4), a grid (1 PIN) of the third NMOS tube (Q4) is connected with the ACC12V end through a 4 th resistor (R4), a 3 rd diode (D3) and a 9 th resistor (R9), and a capacitor (C1) and a 12 th resistor (R12) are connected between the grid (1 PIN) of the third NMOS tube (Q4) and a grounding end in parallel;
The ACC_Detect signal end and the SW_Down signal end are connected to an I/O PIN of an ADAS equipment main control chip, the ACC_Detect signal end is grounded through a first NMOS tube (Q2), a grid electrode (1 PIN) of the first NMOS tube (Q2) is connected with an ACC12V end through a 4 th resistor (R4) and a 6 th resistor (R6), and is grounded through a 7 th resistor (R7), and the ACC_Detect signal end is also connected with a VCC3V3 end through a 1 st resistor (R1);
the voltage of the grid electrode (1 PIN) of the first NMOS tube (Q2) is larger than the threshold value, and the voltage is calculated as follows:
The ACC is ACC12V terminal voltage, and R4, R6, R7, R9 and R12 are resistance values of corresponding resistors.
2. The power on/off control circuit according to claim 1, wherein the capacitor (C1) is grounded through a fourth NMOS transistor (Q5) at a junction with the gate (1 PIN) of the third NMOS transistor (Q4), the gate (1 PIN) of the fourth NMOS transistor (Q5) is connected to the sw_down signal terminal and is grounded through an 8 th resistor (R8), and the capacitor (C1) and the 2 nd zener diode (D6) are connected in parallel between the gate (1 PIN) of the third NMOS transistor (Q4) and the ground terminal.
3. The power on/off control circuit according to claim 1, wherein the gate (1 PIN) voltage of the third NMOS transistor (Q4) is greater than the threshold value thereof, the voltage calculation formula is as follows, wherein ACC is ACC12V terminal voltage, R4, R6, R7, R9, R12 are the resistance values of the corresponding resistors,
4. The Power on/off control circuit according to claim 1, wherein the button_detect signal terminal and the power_hold signal terminal are connected to an I/O PIN of an ADAS device master control chip, one end of a key (S1) is grounded, the other end of the key (S1) is connected to a gate (1 PIN) of a PMOS tube (Q1) through a 2 nd diode (D2), the VCC12V terminal is connected through a 2 nd resistor (R2), the button_detect signal terminal is connected through a1 st diode (D1), and the VCC3V terminal is connected through a1 st diode (D1) and a 3 rd resistor (R3), the gate (1 PIN) of the PMOS tube (Q1) is also grounded through a second NMOS tube (Q3), and the gate (1 PIN) of the second NMOS tube (Q3) is connected to the power_hold signal terminal and grounded through an 11 th resistor (R11).
5. The switching on/off control circuit according to any one of claims 1 to 4, characterized in that one or more of the NMOS transistors (Q2, Q3, Q4, Q5) are replaced with NPN transistors and/or the PMOS transistor (Q1) is replaced with a relay.
6. The on-off control circuit according to any one of claims 1 to 4, wherein the ADAS device is a binocular camera.
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| CN104244522B (en) * | 2014-09-12 | 2016-08-17 | 乐清市八达光电科技股份有限公司 | A kind of automobile lamp intelligence power-off protector |
| CN108944746A (en) * | 2018-08-31 | 2018-12-07 | 华勤通讯技术有限公司 | A kind of mobile unit and automobile |
| CN111114591B (en) * | 2020-01-16 | 2021-12-07 | 中车南京浦镇车辆有限公司 | Awakening logic control circuit |
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| CN205769122U (en) * | 2016-06-01 | 2016-12-07 | 安徽超远信息技术有限公司 | Vehicle power control system |
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