CN211908360U - Camera power supply protection circuit - Google Patents
Camera power supply protection circuit Download PDFInfo
- Publication number
- CN211908360U CN211908360U CN202020676551.0U CN202020676551U CN211908360U CN 211908360 U CN211908360 U CN 211908360U CN 202020676551 U CN202020676551 U CN 202020676551U CN 211908360 U CN211908360 U CN 211908360U
- Authority
- CN
- China
- Prior art keywords
- current
- limiting protection
- chip
- capacitor
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a camera power supply protection circuit, it includes power module, MCU module, current-limiting protection module and video receiving module, and current-limiting protection module includes current-limiting protection IC circuit and band elimination filter circuit, and video receiving module, current-limiting protection module all are connected with the MCU module, and band elimination filter circuit is connected to the video signal input of video receiving module, and the output of video receiving module exports MIPI signal to main control unit; the current-limiting protection IC circuit is connected with the camera through the band-elimination filter circuit. The MCU module is used for detecting the power supply current of the camera and controlling the power supply switch of the camera; the current-limiting protection module is used for setting the power supply voltage of the camera, and meanwhile, a current-limiting point is set for the power supply current of the camera, and when the power supply of the camera is in short circuit with the ground, the current is clamped at the current-limiting point and cannot be further increased. This scheme is applicable to the monocular camera of car.
Description
Technical Field
The utility model belongs to the technical field of car image equipment and specifically relates to a camera power supply protection circuit is related to, specifically is applied to car monocular remote camera, for example the preceding car collision detection camera or the rearview camera that backs a car in ADAS (Advanced Driving Assistance System) application.
Background
The monocular camera power supply mode in the existing market is supplied power by the control box basically, for example, the one-way forward-looking camera, blind area detection left-right-looking camera, back-up rearview camera and the like in ADAS application, the control box gets electricity from the original vehicle battery and directly supplies power to the camera after passing through the filter circuit, and the power supply mode has the following risks: 1. during installation, if an installer operates improperly, the wires can be extruded and damaged, and the power line, the signal line and the ground line are short-circuited; 2. when the camera is used, internal devices fail to cause short circuit between a power supply and the ground. Above two kinds of failure modes all can draw the power that the camera was supplied with to the control box to the ground potential, cause the electric current sudden change in the twinkling of an eye, not only can lead to the control box function to lose, serious even can burn control box power module or because of the electric current is too big and generate heat the fire.
In addition, the input voltage of the camera generally has various voltage specifications such as 3.3V, 5V, 9V, 12V, and the like, the control box directly takes electricity from the vehicle body, filters the electricity and then supplies more 12V to the camera, and the camera with the lower voltage specification is not suitable, so that the control box is difficult to adapt to the cameras with different voltage specifications under the condition of not modifying the circuit design, and the compatibility is low.
Disclosure of Invention
The utility model discloses solve the technical problem that prior art exists can not carry out effective protection to camera power supply to ground short-circuit fault, provide a camera power supply protection circuit that can not cause serious consequence even take place to ground short circuit.
The utility model discloses to above-mentioned technical problem mainly can solve through following technical scheme: a camera power supply protection circuit comprises a power supply module, an MCU module, a current limiting protection module and a video receiving module, wherein the current limiting protection module comprises a current limiting protection IC circuit and a band-stop filter circuit; the current-limiting protection IC circuit comprises a current-limiting protection chip U5, the current-limiting protection chip U5 is S-19700A00A-E8, a pin 1 of the current-limiting protection chip U5 is connected with a power supply 12V through a resistor R20, a pin 2 of the current-limiting protection chip U5 is connected with the power supply 12V through a resistor R19, a pin 3 of the current-limiting protection chip is connected with the power supply 12V, a first end of a capacitor C16 is connected with a pin 3 of a current-limiting protection chip U5, a second end of the capacitor C16 is grounded, and a capacitor C17 is connected with a capacitor C16 in parallel; pins 4 and 5 of the current-limiting protection chip U5 are connected with the MCU module, the first end of the capacitor C15 is connected with the pin 4 of the current-limiting protection chip U5, the second end of the capacitor C15 is grounded, and the resistor R21 is connected with the capacitor C15 in parallel; pins 6 and 9 of the current-limiting protection chip U5 are grounded; the 7 feet of the current-limiting protection chip U5 are grounded through a resistor R23, a resistor R22 is bridged between the 7 feet and the 8 feet of the current-limiting protection chip U5, the first end of a capacitor C18 is connected with the 8 feet of the current-limiting protection chip U5, the second end of a capacitor C18 is grounded, the capacitor C19 and the capacitor C18 are connected in parallel, the 8 feet of the current-limiting protection chip U5 output voltage to a band-elimination filter circuit, and the band-elimination filter circuit is connected with a camera.
The MCU module is used for detecting the power supply current of the camera and controlling the power supply switch of the camera; the current-limiting protection module is used for setting power supply voltage of the camera, output voltage can be set through two external feedback resistors R22 and R23, a current-limiting point is also set for power supply current of the camera, when a power supply of the camera is in short circuit with the ground, the current is clamped at the current-limiting point and cannot be further increased, a real-time current value is fed back to the MCU in a voltage mode, the MCU can close or open the power supply output of the current-limiting protection IC through an ON/OFF pin connected with the current-limiting protection IC, and the band-stop filter circuit is used for isolating received serial high-speed video signals from the power supply and does not influence the normal transmission of the video signals; the video receiving module converts the received serial high-speed video signal into an MIPI signal and outputs the MIPI signal to the main controller for image processing and storage.
Preferably, the band-elimination filter circuit comprises an inductor L1, an inductor L2 and an inductor L3, wherein a first end of the inductor L3 is connected with an 8-pin of a current-limiting protection chip U5, a second end of the inductor L3 is connected with a first end of an inductor L1 through an inductor L2, and a second end of the inductor L1 is connected with a camera through a terminal J1; the video receiving module comprises a resistor R9, an inductor L3, a resistor R8, an inductor L2, a resistor R7, an inductor L1, a first end of a capacitor C8 is connected with a first end of the inductor L3, a second end of the capacitor C8 is grounded, a capacitor C7 and a capacitor C8 are connected in parallel, a first end of a capacitor C3 is connected with a second end of the inductor L1, and a second end of a capacitor C3 is connected with the video receiving module.
Preferably, the MCU module includes an MCU chip U2, the MCU chip U2 is N76E003AQ20, a pin 16 of the MCU chip U2 is connected to a pin 5 of the current limiting protection chip U5, a pin 17 of the MCU chip U2 is connected to a pin 4 of the current limiting protection chip U5, and pins 11 and 12 of the MCU chip U2 are connected to the video receiving module.
Preferably, the video receiving module includes a deserializing chip U1, the deserializing chip U1 is MAX9288GTM, pin 14 of the deserializing chip U1 is connected to pin 11 of the MCU chip U2, pin 13 of the deserializing chip U1 is connected to pin 12 of the MCU chip U2, and pin 7 of the deserializing chip U1 is connected to the second end of the capacitor C3 in the band elimination filter circuit through a resistor C34.
Preferably, the power module comprises an interface filter circuit, a primary LDO circuit and a secondary LDO circuit, wherein the input end of the interface filter circuit is connected with a vehicle body power supply, the output end of the interface filter circuit outputs 12V voltage, the input end of the primary LDO circuit is connected with the 12V power supply, and the output end of the primary LDO circuit outputs 3.3V voltage; the input end of the secondary LDO circuit is connected with 3.3V voltage, and the output end of the secondary LDO circuit outputs 1.8V voltage.
The interface filter circuit supplies power to the current limiting chip and the first-level LDO filter, the first-level LDO output supplies power to the second-level LDO, the MCU module and the video receiving module, and the second-level LDO supplies power to the video receiving module.
The utility model has the advantages that the current is ensured not to cause abnormal function or damage of the control box due to the short circuit between the power supply and the ground or the wire harness generates heat and fires due to overlarge current, the accident caused by overlarge current on the camera line can be completely avoided, and different output voltages can be set to adapt to the cameras with different voltage requirements; the current that can real-time supervision camera consumed for judge the operating condition of camera.
Drawings
Fig. 1 is a block circuit diagram of the present invention;
fig. 2 is a current limiting protection IC circuit diagram of the present invention;
fig. 3 is a circuit diagram of a band-resistance filter circuit according to the present invention;
fig. 4 is a circuit diagram of an MCU module of the present invention;
fig. 5 and 6 are circuit diagrams of a video receiving module according to the present invention;
fig. 7 is a circuit diagram of a power module of the present invention;
in the figure: 1. a power supply module; 2. an MCU module; 3. a current limiting IC protection circuit; 4. a band-stop filter; 5. a video receiving module; 6. a camera is provided.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example (b): the camera power supply protection circuit of this embodiment, as shown in fig. 1, including power module 1, MCU module 2, current-limiting protection module and video receiving module 4, current-limiting protection module includes current-limiting protection IC circuit 3 and band elimination filter circuit 4, and the automobile body power is connected to the power module input, and MCU module, current-limiting protection module and video receiving module are connected to the power module output, video receiving module and MCU module connection, and band elimination filter circuit is connected to video receiving module's video signal input, and video receiving module's output MIPI signal is to main control unit.
As shown in fig. 2, the current-limiting protection IC circuit includes a current-limiting protection chip U5, the current-limiting protection chip U5 is S-19700a00A-E8, pin 1 of the current-limiting protection chip U5 is connected to the power supply 12V through a resistor R20, pin 2 of the current-limiting protection chip U5 is connected to the power supply 12V through a resistor R19, pin 3 of the current-limiting protection chip is connected to the power supply 12V, a first end of a capacitor C16 is connected to pin 3 of the current-limiting protection chip U5, a second end of the capacitor C16 is grounded, and a capacitor C17 is connected in parallel to the capacitor C16; pins 4 and 5 of the current-limiting protection chip U5 are connected with the MCU module, the first end of the capacitor C15 is connected with the pin 4 of the current-limiting protection chip U5, the second end of the capacitor C15 is grounded, and the resistor R21 is connected with the capacitor C15 in parallel; pins 6 and 9 of the current-limiting protection chip U5 are grounded; the 7 feet of the current-limiting protection chip U5 are grounded through a resistor R23, a resistor R22 is bridged between the 7 feet and the 8 feet of the current-limiting protection chip U5, the first end of a capacitor C18 is connected with the 8 feet of the current-limiting protection chip U5, the second end of a capacitor C18 is grounded, the capacitor C19 and the capacitor C18 are connected in parallel, the 8 feet of the current-limiting protection chip U5 output voltage to a band-elimination filter circuit, and the band-elimination filter circuit is connected with the camera 6.
As shown in fig. 3, the band-stop filter circuit includes an inductor L1, an inductor L2, and an inductor L3, a first end of the inductor L3 is connected to the 8-pin of the current-limiting protection chip U5, a second end of the inductor L3 is connected to a first end of the inductor L1 through an inductor L2, and a second end of the inductor L1 is connected to the camera through a terminal J1; the video receiving module comprises a resistor R9, an inductor L3, a resistor R8, an inductor L2, a resistor R7, an inductor L1, a first end of a capacitor C8 is connected with a first end of the inductor L3, a second end of the capacitor C8 is grounded, a capacitor C7 and a capacitor C8 are connected in parallel, a first end of a capacitor C3 is connected with a second end of the inductor L1, and a second end of a capacitor C3 is connected with the video receiving module.
As shown in fig. 4, the MCU module includes an MCU chip U2, the MCU chip U2 is N76E003AQ20, pin 16 of the MCU chip U2 is connected to pin 5 of the current limiting protection chip U5, pin 17 of the MCU chip U2 is connected to pin 4 of the current limiting protection chip U5, and pins 11 and 12 of the MCU chip U2 are connected to the video receiving module.
As shown in fig. 5 and 6, the video receiving module includes a deserializing chip U1, the deserializing chip U1 is MAX9288GTM, pin 14 of the deserializing chip U1 is connected to pin 11 of the MCU chip U2, pin 13 of the deserializing chip U1 is connected to pin 12 of the MCU chip U2, and pin 7 of the deserializing chip U1 is connected to the second end of the capacitor C3 in the band rejection filter circuit through a resistor C34.
As shown in fig. 7, the power module includes an interface filter circuit, a first-stage LDO circuit, and a second-stage LDO circuit, an input end of the interface filter circuit is connected to the vehicle body power supply, an output end of the interface filter circuit outputs 12V voltage, an input end of the first-stage LDO circuit is connected to the 12V power supply, and an output end of the first-stage LDO circuit outputs 3.3V voltage; the input end of the secondary LDO circuit is connected with 3.3V voltage, and the output end of the secondary LDO circuit outputs 1.8V voltage.
The power supply module supplies power to other modules; for example, the voltage requirement of the camera is 5V, the current requirement is 0.2A, the current-limiting protection chip U5 outputs a voltage and a current to the camera, the output voltage is set by resistors R22 and R23, Vout =3.3(1+ R22/R23), R22 and R23 take values of 5.15K and 10K, respectively, then Vout =3.3V = (1+5.15K/10K) =5V, the output current threshold is set by R19, R20, R21, Imax = (Vcso = R19)/(R20 = R21), Vcso is a fixed value of 2.55V, R19, R20, R21 are 100 Ω, 1K, respectively, then Imax = (2.55V = 100 Ω)/(1 Ω = 0.255A), the power supply voltage is calculated by the above formula, and the threshold voltage is 0.255V, and the current-limiting point is 5.255. If the power supply of the camera is shorted to the ground, 5V is pulled to 0V, and the current is clamped at 0.255A and does not increase continuously. The current consumed by the camera can be fed back to the MCU in real time through the CSO pin, the voltage Vcso of the CSO pin is not = (I R20R 21)/R19= (I1 Ω 1000 Ω)/100 Ω =10I, if the MCU detects that the voltage of the CSO pin is always 2.55V, the voltage and current output of the current-limiting protection IC can be closed by pulling down the level of the ON/OFF pin, and the direct current power output by the current-limiting protection IC is supplied to the camera through the video-power isolation circuit; the video receiving module receives the serial high-speed video signal transmitted by the camera, converts the serial high-speed video signal into an MIPI signal and transmits the MIPI signal to the main controller for processing. The circuit logic can ensure that the current cannot be abnormal or damaged due to the short circuit between the power supply and the ground or the wiring harness generates heat and fires due to overlarge current, and can completely avoid accidents caused by overlarge current on the camera line.
The specific embodiments described herein are merely illustrative of the principles of the invention. Various modifications, additions and substitutions for the specific embodiments described herein will occur to those skilled in the art without departing from the principles of the invention or exceeding the scope of the invention as defined by the appended claims.
Although the terms current limiting protection chip, MCU etc. are used more here, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any one of the additional limitations that fall within the spirit of the invention.
Claims (5)
1. A camera power supply protection circuit is characterized by comprising a power supply module, an MCU (microprogrammed control unit) module, a current limiting protection module and a video receiving module, wherein the current limiting protection module comprises a current limiting protection IC (integrated circuit) circuit and a band-stop filter circuit; the current-limiting protection IC circuit comprises a current-limiting protection chip U5, the current-limiting protection chip U5 is S-19700A00A-E8, a pin 1 of the current-limiting protection chip U5 is connected with a power supply 12V through a resistor R20, a pin 2 of the current-limiting protection chip U5 is connected with the power supply 12V through a resistor R19, a pin 3 of the current-limiting protection chip is connected with the power supply 12V, a first end of a capacitor C16 is connected with a pin 3 of a current-limiting protection chip U5, a second end of the capacitor C16 is grounded, and a capacitor C17 is connected with a capacitor C16 in parallel; pins 4 and 5 of the current-limiting protection chip U5 are connected with the MCU module, the first end of the capacitor C15 is connected with the pin 4 of the current-limiting protection chip U5, the second end of the capacitor C15 is grounded, and the resistor R21 is connected with the capacitor C15 in parallel; pins 6 and 9 of the current-limiting protection chip U5 are grounded; the 7 feet of the current-limiting protection chip U5 are grounded through a resistor R23, a resistor R22 is bridged between the 7 feet and the 8 feet of the current-limiting protection chip U5, the first end of a capacitor C18 is connected with the 8 feet of the current-limiting protection chip U5, the second end of a capacitor C18 is grounded, the capacitor C19 and the capacitor C18 are connected in parallel, the 8 feet of the current-limiting protection chip U5 output voltage to a band-elimination filter circuit, and the band-elimination filter circuit is connected with a camera.
2. The camera power supply protection circuit according to claim 1, wherein the band-rejection filter circuit comprises an inductor L1, an inductor L2 and an inductor L3, a first end of the inductor L3 is connected with an 8-pin of a current-limiting protection chip U5, a second end of the inductor L3 is connected with a first end of the inductor L1 through an inductor L2, and a second end of the inductor L1 is connected with the camera through a terminal J1; the video receiving module comprises a resistor R9, an inductor L3, a resistor R8, an inductor L2, a resistor R7, an inductor L1, a first end of a capacitor C8 is connected with a first end of the inductor L3, a second end of the capacitor C8 is grounded, a capacitor C7 and a capacitor C8 are connected in parallel, a first end of a capacitor C3 is connected with a second end of the inductor L1, and a second end of a capacitor C3 is connected with the video receiving module.
3. The camera power protection circuit according to claim 2, wherein the MCU module comprises an MCU chip U2, the MCU chip U2 is N76E003AQ20, pin 16 of the MCU chip U2 is connected to pin 5 of the current limiting protection chip U5, pin 17 of the MCU chip U2 is connected to pin 4 of the current limiting protection chip U5, and pins 11 and 12 of the MCU chip U2 are connected to the video receiving module.
4. The camera power supply protection circuit of claim 3, wherein the video receiving module comprises a deserializing chip U1, the deserializing chip U1 is MAX9288GTM, a 14 pin of the deserializing chip U1 is connected to an 11 pin of the MCU chip U2, a 13 pin of the deserializing chip U1 is connected to a 12 pin of the MCU chip U2, and a 7 pin of the deserializing chip U1 is connected to the second end of the capacitor C3 in the band elimination filter circuit through a resistor C34.
5. The camera power supply protection circuit according to claim 1 or 4, wherein the power supply module comprises an interface filter circuit, a first-stage LDO circuit and a second-stage LDO circuit, an input end of the interface filter circuit is connected with a vehicle body power supply, an output end of the interface filter circuit outputs 12V voltage, an input end of the first-stage LDO circuit is connected with the 12V power supply, and an output end of the first-stage LDO circuit outputs 3.3V voltage; the input end of the secondary LDO circuit is connected with 3.3V voltage, and the output end of the secondary LDO circuit outputs 1.8V voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020676551.0U CN211908360U (en) | 2020-04-28 | 2020-04-28 | Camera power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020676551.0U CN211908360U (en) | 2020-04-28 | 2020-04-28 | Camera power supply protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211908360U true CN211908360U (en) | 2020-11-10 |
Family
ID=73277263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020676551.0U Active CN211908360U (en) | 2020-04-28 | 2020-04-28 | Camera power supply protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211908360U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113097968A (en) * | 2021-04-10 | 2021-07-09 | 深圳市豪恩汽车电子装备股份有限公司 | Power supply circuit for automobile camera |
-
2020
- 2020-04-28 CN CN202020676551.0U patent/CN211908360U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113097968A (en) * | 2021-04-10 | 2021-07-09 | 深圳市豪恩汽车电子装备股份有限公司 | Power supply circuit for automobile camera |
| CN113097968B (en) * | 2021-04-10 | 2022-12-02 | 深圳市豪恩汽车电子装备股份有限公司 | Power supply circuit for automobile camera |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102343877B (en) | Low voltage bus stability | |
| CN108819779B (en) | Charging system and electric automobile | |
| CN105711520A (en) | Power management circuit of vehicle control unit and control method thereof | |
| DE102012202130A1 (en) | Electric power supply system | |
| US8928175B2 (en) | Junction box, energy system and method for controlling the same | |
| CN204436765U (en) | A kind of precharge protective gear of passenger car variable-frequency air conditioner direct current compressor | |
| CN109693625A (en) | Automobile standby power supply module and automobile power supply system comprising it | |
| CN211908360U (en) | Camera power supply protection circuit | |
| CN204340887U (en) | Electric telescopic pedal | |
| CN109532496A (en) | A kind of intelligent high-pressure block terminal based on CAN bus network | |
| CN201766247U (en) | Multifunctional energy-saving socket | |
| CA2792870A1 (en) | Electronic control unit | |
| CN110667381A (en) | Standby power supply system for realizing multiple protection of parking controller | |
| CN110356232A (en) | A kind of monitoring device and vehicle for vehicle | |
| CN103600662B (en) | For the high pressure control management system of super capacitor pure electric coach | |
| EP0783994A1 (en) | Vehicle alternator control system | |
| CN210652696U (en) | New energy automobile and low-voltage power supply circuit thereof | |
| DE102011017274B4 (en) | Method, energy storage device management system and circuit arrangement for charging a vehicle battery with the vehicle electrical system switched off | |
| CN219096584U (en) | Electronic controller and vehicle | |
| CN207686892U (en) | A kind of bus startup control circuit | |
| CN203071561U (en) | Device for detecting faults of motor controller pre-charging circuit | |
| CN211420991U (en) | Road sweeping vehicle line safety arrangement | |
| CN214001351U (en) | Range-extended pure electric vehicle safety interlocking loop signal detection loop | |
| CN205429701U (en) | Safety protection circuit of pure electric vehicles motor | |
| CN109130860B (en) | Multisource monitored control system and power module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 318000 1st floor, building 1, No. 818, east section of Kaifa Avenue, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Zhejiang Woder Technology Group Co.,Ltd. Address before: 318000 No.1, building 1, No.818, east section of Kaifa Avenue, Jiaojiang District, Taizhou City, Zhejiang Province Patentee before: ZHEJIANG WODELL TECHNOLOGY Co.,Ltd. |