CN112180183A - State monitoring circuit and method for vehicle-mounted electronic equipment - Google Patents
State monitoring circuit and method for vehicle-mounted electronic equipment Download PDFInfo
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- CN112180183A CN112180183A CN201910585233.5A CN201910585233A CN112180183A CN 112180183 A CN112180183 A CN 112180183A CN 201910585233 A CN201910585233 A CN 201910585233A CN 112180183 A CN112180183 A CN 112180183A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
- G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16523—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using diodes, e.g. Zener diodes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
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Abstract
A state monitoring circuit and method of vehicle-mounted electronic equipment comprises a microprocessor, a serializer/deserializer, a DCDC power module and a camera module, wherein the DCDC power module is connected with the serializer/deserializer, and data communication is realized between the microprocessor and the camera module through the serializer/deserializer; the method is characterized in that: the device also comprises a current detection module, a comparison module and a switch module; the switch module is connected with the DCDC power supply module to control the on or off of power supply; the input end of the current detection module is connected with the output end of the DCDC power supply module so as to detect output current and convert the output current into voltage; the input end of the comparison module is connected with the output end of the current detection module to carry out voltage comparison; the microprocessor is connected with the output end of the comparison module to control the state of the switch module according to the comparison result. The circuit of the invention has simple structure, easy realization, low circuit cost and strong universality.
Description
Technical Field
The invention relates to the field of vehicle-mounted equipment, in particular to a state monitoring circuit and method of vehicle-mounted electronic equipment.
Background
With the rapid development of the automobile market, the application of the vehicle-mounted electronic equipment on the automobile is more and more extensive, and meanwhile, the requirements of customers on vehicle-mounted video display are higher and higher, such as backing video display and driving record video monitoring. In order to meet the video display effect of vehicle-mounted high resolution, the high-definition LVDS camera is popular with customers. The LVDS high-definition camera is generally suitable for an LVDS high-definition camera in a vehicle-mounted special environment, requires long-distance transmission and high anti-interference capacity, and is usually transmitted and controlled in a mode of an FPD-Link serializer/deserializer. At present, a more mature scheme such as TI. adopts a twisted pair or a coaxial cable as a transmission medium between a serializer and a deserializer to realize the transmission of high-speed signals, so that the vehicle-mounted display equipment can be far away from a high-definition camera by more than a few meters.
In the practical application process, because the engineering wiring on the vehicle is considered, the cost is saved, and meanwhile, the working hours are shortened, the connection between the high-definition LVDS camera and the vehicle-mounted display terminal generally adopts a coaxial transmission mode, and at the moment, on a coaxial line, a high-definition video signal and a related control signal are transmitted, and a power supply is transmitted. In practical use, because the LVDS camera is required to normally work, the vehicle-mounted display equipment is required to supply power to the LVDS camera and initialize the relevant register configured in the serializer of the LVDS camera, and after the LVDS camera normally works, the LVDS camera transmits a high-definition video signal to the vehicle-mounted display terminal through the internal serializer in a transparent transmission mode to normally display the high-definition video signal. However, in the process of powering on the LVDS high-definition camera and realizing normal operation during initialization, if the power-on sequence is not correct, the initialization of the serializer fails, or a fault of the camera itself, such as an internal short circuit or a circuit break, will cause the camera to fail to operate normally.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art and provides a state monitoring circuit and a state monitoring method for electronic equipment, wherein the circuit is simple in structure, easy to implement, low in circuit cost and high in universality.
The invention adopts the following technical scheme:
a state monitoring circuit of vehicle-mounted electronic equipment comprises a microprocessor, a serializer/deserializer, a DCDC power module and a camera module, wherein the DCDC power module is connected with the serializer/deserializer, and data communication is realized between the microprocessor and the camera module through the serializer/deserializer; the method is characterized in that: the device also comprises a current detection module, a comparison module and a switch module; the switch module is connected with the DCDC power supply module to control the on or off of power supply; the input end of the current detection module is connected with the output end of the DCDC power supply module so as to detect output current and convert the output current into voltage; the input end of the comparison module is connected with the output end of the current detection module to carry out voltage comparison; the microprocessor is connected with the output end of the comparison module to control the state of the switch module according to the comparison result.
Preferably, the current detection module is a current detection amplifier.
Preferably, the comparing module includes a first comparator, a power source VCC, a resistor R11, a resistor R12, a diode D3, a diode D5, a resistor R13, and a resistor R14; the positive input end of the first comparator is connected with the cathode of a diode D3, and the anode of a diode D3 is connected with the output end of the current detection module; the negative input end of the first comparator is connected with the negative electrode of the diode D5, one end of the resistor R12 and one end of the resistor R11; the other end of the resistor R11 is connected with a power supply VCC, and the other end of the resistor R12 and the anode of the diode D5 are grounded; one end of the resistor R13 is connected with the output end of the first comparator, and the other end of the resistor R14 is connected with one end of the resistor R14 and the microprocessor; the other end of the resistor R14 is connected to ground.
Preferably, the comparison module includes a second comparator, a power source VCC, a resistor R3, a resistor R4, a resistor R6, a diode D4, and a diode D1; the positive input end of the second comparator is connected with the negative electrode of a diode D4, and the positive electrode of a diode D4 is connected with the output end of the current detection module; the negative input end of the second comparator is connected with the negative electrode of the diode D1, one end of the resistor R4 and one end of the resistor R3; the other end of the resistor R3 is connected with a power supply VCC, and the other end of the resistor R4 and the anode of the diode D1 are grounded; one end of the resistor R5 is connected with the output end of the second comparator, and the other end of the resistor R6 is connected with one end of the resistor R6 and the microprocessor; the other end of the resistor R6 is connected to ground.
Preferably, the switch module comprises a transistor Q1 and a resistor R1; the base electrode of the triode Q1 is connected with one end of a resistor R1, the collector electrode is connected with the DCDC power supply module, and the emitting electrode is grounded; the other end of the resistor R1 is connected to the microprocessor.
Preferably, the system further comprises a status indication module connected with the microprocessor.
Preferably, the status indicating module comprises a transistor Q2, a light emitting diode D2 and a resistor R10; the base electrode of the triode Q2 is connected with the microprocessor, the collector electrode is connected with the negative electrode of the light emitting diode D2, and the emitter electrode is grounded; the anode of the LED D2 is connected to one end of a resistor R10, and the other end of R10 is connected to a power supply VCC.
Preferably, the status indicating module comprises a transistor Q3, a light emitting diode D6 and a resistor R10; the base electrode of the triode Q3 is connected with the microprocessor, the collector electrode is connected with the negative electrode of the light emitting diode D6, and the emitter electrode is grounded; the anode of the LED D6 is connected to one end of a resistor R10, and the other end of R10 is connected to a power supply VCC.
A state monitoring method of vehicle-mounted electronic equipment is used for detecting the working state of a camera module; the camera module and the microprocessor realize data communication through a serializer/deserializer and supply power through a DCDC power module; the method is characterized in that: and the current detection module is used for detecting the output current of the DCDC power supply module and converting the output current into voltage, the voltage is input into the comparison module for voltage comparison, and the DCDC power supply module is controlled to keep or close power supply or control the restart of the camera module according to the comparison result.
Preferably, the comparison result includes that the camera is in a normal working state or is not normally started or is in an open circuit or in an overcurrent state.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
1. the circuit and the method adopt the matching of the current detection module, the comparison module and the switch module, compare the voltage by detecting the output current of the DCDC power supply module and converting the output current into the voltage, and control the DCDC power supply module to keep or close power supply or control the camera module to restart according to the comparison result.
2. The circuit and the method of the invention utilize the detection principle of the current detection amplifier and the voltage functional characteristics of the voltage comparator, and have high-precision detection.
3. The circuit provided by the invention combines the detection control technology of the I/O port, the transparent transmission control technology of the FPD-Link serializer/deserializer and the POC power supply technology to realize the state detection and control of the vehicle-mounted LVDS high-definition camera, so that the high-definition camera can be monitored and controlled in real time when a fault occurs, and the fault troubleshooting of the high-definition camera in the actual application is facilitated.
4. The circuit and the method provided by the invention are provided with the state indicating module, and the working state of the camera module is reminded through the light-emitting diode, so that the installation and debugging of a high-definition camera on a vehicle are facilitated.
Drawings
FIG. 1 is a circuit diagram of the present invention;
FIG. 2 is a flow chart of the present invention.
Detailed Description
The invention is further described below by means of specific embodiments.
Fig. 1 is a state monitoring circuit of a vehicle-mounted electronic apparatus, which includes a microprocessor, a serializer/deserializer, a DCDC power module U11, a camera module, and the like. The DCDC power module U11 is connected to a serializer/deserializer, and data communication is realized between the microprocessor and the camera module through the serializer/deserializer. The serializer/deserializer comprises a serializer U2 and a deserializer U3, and data interaction is carried out between the serializer U3 and the deserializer U2 through a coaxial line. Serializer U2 may be an FPD-Link serializer (e.g., TI DS90UB935-Q1), and deserializer U3 may be an FPD-Link deserializer (e.g., TI DS90UB 936-Q1).
The DCDC power module U11 has an input terminal VIN, an enable terminal EN, and an output terminal VOUT. The input end VIN is connected to the power supply front end U10, and the power supply front end U10 includes a surge protection circuit, a front end filter circuit, and the like. The U10 input is connected to the vehicle's power supply B +, which is typically 24V. A resistor R9 is connected between the input terminal VIN and the enable terminal EN as a pull-up resistor, and filter capacitors C1 and C2 are connected to the output terminal thereof. When the enable end EN is high, the DC-DC power supply module outputs voltage; when the EN end of the enabling end is low, the DC-DC power supply module has no output.
The camera module can be an LVDS high-definition camera, and comprises a power supply module U6, an ISP module U4, a SENSOR module U5 and the like. The power module U6 includes a DC-DC and LDO inside to supply power to U3, U4, and U5, respectively. The power module is powered by a DCDC power module U11. Specifically, the POC power supply circuit comprises two Bias Tee circuits for realizing POC power supply. One path is connected between the power module and the coaxial line of the serializer/deserializer and comprises a magnetic bead L1, a magnetic bead L6, a capacitor C4, an inductor L5, a resistor R8, a capacitor C7 and a capacitor C8. The capacitor C4 is a high-frequency coupling capacitor, one end of the capacitor C4 is connected with the input end of the serializer U3, the other end of the capacitor C4 is connected with one end of a magnetic bead L1, the other end of the magnetic bead L1 is connected with one end of an inductor L5, and the resistor R8 is connected with the inductor L5 in parallel. The other end of the inductor L5 is connected with one end of a capacitor C7, a capacitor C8 and a magnetic bead L6, the other end of the magnetic bead L6 is connected with the input end of the power supply module, and the capacitors C7 and C8 are filter capacitors.
The other path is connected between the DCDC power supply module U11 and the coaxial line and comprises a magnetic bead L2, a magnetic bead L3, a capacitor C3, an inductor L4, a resistor R7, a capacitor C5 and a capacitor C6. The capacitor C3 is a high-frequency coupling capacitor, one end of the capacitor C3 is connected with the output end of the deserializer U2, the other end of the capacitor C3 is connected with one end of a magnetic bead L2, the other end of the magnetic bead L2 is connected with one end of an inductor L4, and a resistor R7 is connected with the inductor L4 in parallel. The other end of the inductor L4 is connected with one end of a capacitor C5, a capacitor C6 and a magnetic bead L3, the other end of the magnetic bead L3 is connected with the output end of the DCDC power supply module U11, and the capacitors C5 and C6 are filter capacitors
The invention also comprises a current detection module, a comparison module, a switch module and the like. The switch module is connected to the DCDC power module U11 to control the power on or off. The switch module may employ an NPN transistor or other switching element. Preferably, the transistor Q1 and the resistor R1 are included; the base electrode of the triode Q1 is connected with one end of a resistor R1, the collector electrode of the triode Q1 is connected with the enable end EN of a DCDC power supply module U11, and the emitter electrode of the triode Q1 is grounded; the other end of the resistor R1 is connected to the microprocessor U1. R1 is a current limiting resistor.
The input end of the current detection module is connected with the output end of the DCDC power supply module U11 to detect the output current and convert the output current into voltage. The current detection module may employ a current detection amplifier U9, for example, a meixin MAX9938 in practical applications. The output end of the DCDC power supply module U11 is provided with a resistor R2 as a current detection resistor, the input end of U9 is connected with the two ends of the current detection resistor, and the output end is connected with the comparison module.
The input end of the comparison module is connected with the output end of the current detection module to perform voltage comparison. It can be implemented using a plurality of comparator circuits, preferably two. The method comprises the following specific steps:
one comparison circuit comprises a first comparator U7, a power supply VCC, a resistor R11, a resistor R12, a diode D3, a diode D5, a resistor R13 and a resistor R14; the positive input end of the first comparator U7 is connected with the cathode of a diode D3, and the anode of a diode D3 is connected with the output end of the current detection module; the negative input end of the first comparator U7 is connected with the negative electrode of the diode D5, one end of the resistor R12 and one end of the resistor R11; the other end of the resistor R11 is connected with a power supply VCC, and the other end of the resistor R12 and the anode of the diode D5 are grounded; one end of the resistor R13 is connected with the output end of the first comparator, and the other end is connected with one end of the resistor R14 and the microprocessor; the other end of the resistor R14 is connected to ground. The comparison circuit is used for judging whether the camera module is normally started or internally broken.
The other comparison circuit comprises a second comparator U8, a resistor R3, a resistor R4, a resistor R6, a diode D4 and a diode D1; the positive input end of the second comparator U8 is connected with the cathode of a diode D4, and the anode of a diode D4 is connected with the output end of the current detection module; the negative input end of the second comparator U8 is connected with the negative electrode of the diode D1, one end of the resistor R4 and one end of the resistor R3; the other end of the resistor R3 is connected with a power supply VCC, and the other end of the resistor R4 and the anode of the diode D1 are grounded; one end of the resistor R5 is connected with the output end of the second comparator U8, and the other end is connected with one end of the resistor R6 and the microprocessor; the other end of the resistor R6 is connected to ground. The comparison circuit is used for judging whether the camera module is in overcurrent or not.
In the comparison circuit, the diode D1 and the diode D5 are different voltage-stabilizing diodes, the resistor R3, the resistor R4, the resistor R11 and the resistor R12 are voltage-dividing resistors, and the diode D3 and the diode D4 are diodes with the same parameters.
The resistor R5 and the resistor R6 are voltage dividing resistors at the output end of the second comparator U8, so that the high level output from the second comparator U8 to the I/O port of the microprocessor U1 is ensured not to exceed the supply voltage (generally 3.3V) of the I/O port. The resistor R13 and the resistor R14 are voltage dividing resistors at the output end of the first comparator U7, so that the high level output from the first comparator U7 to the I/O port of the microprocessor U1 is ensured not to exceed the supply voltage (generally 3.3V) of the I/O port.
The system also comprises a status indication module which is connected with the microprocessor. The camera module comprises at least one state indicating circuit for prompting the state of the camera module. Preferably two, in particular as follows:
the state indicating circuit comprises a transistor Q2, a light emitting diode D2 and a resistor R10; the base electrode of the triode Q2 is connected with the microprocessor, the collector electrode is connected with the negative electrode of the light emitting diode D2, and the emitter electrode is grounded; the anode of the LED D2 is connected to one end of a resistor R10, and the other end of R10 is connected to a power supply VCC.
The other state indicating circuit comprises a transistor Q3, a light emitting diode D6 and a resistor R10; the base electrode of the triode Q3 is connected with the microprocessor, the collector electrode is connected with the negative electrode of the light emitting diode D6, and the emitter electrode is grounded; the anode of the LED D6 is connected to one end of a resistor R10, and the other end of R10 is connected to a power supply VCC.
Wherein: the resistor R10 is a current limiting resistor and the transistor Q2, and the transistor Q3 is an NPN transistor. The flash of the light emitting diode D2 can be set to indicate that the camera module works normally, the light emitting diode D2 is normally on to indicate that the current is too low, the camera module is not normally started, and the light emitting diode D6 is normally on to indicate that the internal current of the camera module is too high, and a short circuit can possibly occur inside.
The microprocessor U1 is connected to the output of the comparison module to control the state of the switch module based on the comparison. The microprocessor U1 is a core system module, which contains a CPU, a DDR3, an EMMC, a PMIC and the like, has an audio/video coding and decoding function, contains a two-way LVDS interface, an HDMI interface, an MIPI _ CSI interface, and contains a combination circuit of WIFI, Bluetooth, GPS and the like, and actually operates under an android platform, wherein I/O1, I/O2, I/O3 and I/O4 are internal GPIO ports of U1, I/O1 and I/O2 are configured such that input ports are respectively connected with output ends of two comparison circuits, I/O3, I/O4 and I/O5 are output ports, I/O3 is connected with a base electrode of a triode Q2, I/O4 is connected with a resistor R1, and I/O5 is connected with a base electrode of the triode Q3.
I2C communication and MIPI _ CSI interface communication are carried out between the microprocessor U1 and the serializer U2; the U1 initializes the deserializer U3 through I2C configuration related registers at power-on initialization, so that the camera module and the microprocessor U1 can communicate normally.
The invention also provides a state monitoring method of the vehicle-mounted electronic equipment, which is used for detecting the working state of the camera module. The current detection module is used for detecting the output current of the DCDC power supply module and converting the output current into voltage, the voltage is input into the comparison module for voltage comparison, and the DCDC power supply module is controlled to keep or close power supply or control the restarting of the camera module according to the comparison result. The comparison result comprises that the camera is in a normal working state or is not normally started or is in an open circuit or in an overcurrent state and the like. The method comprises the following steps:
when the LVDS high-definition camera normally works, the total current passing through the resistor R2 is set to be I1; the total current through R2 for the current test is I2; when I2 is equal to I1, the operating state of the LVDS high-definition camera is indicated, when I2 is less than I1, the LVDS high-definition camera is not normally started or has an internal open circuit, and when I2> I1, a short circuit may occur inside the LVDS camera, which may cause an excessive current.
The voltage of a point A of the first comparator U7 is represented by VA, and the lower limit value of the point B defaulted to be the normal voltage is VB; the voltage at the point P of the second comparator U8 is represented by VP, and the upper limit voltage value VN of the normal voltage is defaulted at the point N; the voltage drops of D3 and D4 are V3 and V4 (in practice, V3 is approximately equal to V4), and VN > VB is set.
In practical applications, if U9 adopts meixin MAX 9938: VA R2 Rout/Rin-V3,
VP ═ I × R2 × Rout/Rin-V4, where VA is approximately equal to VP.
When VA is greater than VB and VP is less than VN, the working normal state of the LVDS high-definition camera is represented, and the current monitored by U9 is within a normal range; when VA is less than VB, the LVDS high-definition camera is not normally started or has an internal open circuit, and the current monitored by the U9 is smaller than the normal working current range; when VP > VN, it is indicated that a short circuit may occur inside the LVDS high-definition camera, so that the current is too large, and the current monitored by U9 exceeds the normal current range.
The concrete steps are shown in figure 2
The device is powered on and initialized, the current passing through the resistor R2 is monitored through the current detection amplifier U9, the converted voltage is output to the first voltage comparator U7, the voltage is compared in the second voltage comparator U8, when VA is greater than VB and VP is less than VN, the microprocessor U1 detects that I/O1 is high level and I/O2 is low level, at the moment, the microprocessor U1 keeps the output of I/O4 low, and meanwhile, the I/O3 outputs a waveform with fixed frequency F, so that the light emitting diode D2 flickers to indicate that the LVDS camera is in a normal working state.
When VA < VB, the microprocessor U1 detects that I/O1 is low level, I/O2 is low level, which indicates that the LVDS camera is not normally started or internally disconnected, and the microprocessor U1 controls the output of I/O3 to be high level, so that the light-emitting diode D2 is normally on to remind a fault, and simultaneously controls the output of I/O4 to be high; after time T1, the I/O4 and the I/O3 are pulled down again, and at the same time, the microprocessor U1 remotely transmits the information to the deserializer U3 through the I2C and the serializer U2 to configure internal relevant registers, so that the LVDS high-definition camera is initialized again, the LVDS high-definition camera is restarted once again, the microprocessor U1 performs the I/O1, and the I/O2 performs detection and processing, which includes the following steps:
if the I/O1 is at a low level and the I/O2 is at a low level, the microprocessor U1 controls the I/O3 to be high, so that the light-emitting diode D2 is always on to remind of a fault, and simultaneously controls the I/O4 to be high, the DCDC power supply module U11 is turned off to output power, and power is not supplied to the LVDS camera any more;
if the I/O1 is at a high level, the I/O2 is at a low level, the microprocessor U1 keeps the I/O4 at a low level, and the I/O3 outputs a waveform with a fixed frequency F, so that the light emitting diode D2 flickers to indicate that the LVDS camera is in a normal working state;
if the I/O1 is at a high level and the I/O2 is at a high level, which indicates that the LVDS high-definition camera is in an overcurrent state and a short circuit may occur inside the LVDS high-definition camera, the microprocessor U1 controls the I/O4 to output the high level, disconnects the output power of the DCDC power module U11, stops supplying power to the LVDS high-definition camera, and simultaneously the microprocessor U1 controls the I/O5 to output the high level, so that the light-emitting diode D6 is normally on to prompt an overcurrent abnormality.
When VP > VN, the microprocessor U1 detects that I/O1 is at a high level, I/O2 is at a high level, which indicates that the LVDS high-definition camera is in an overcurrent state, and there is a possibility of an internal short circuit, the microprocessor U1 controls the I/O4 to output a high level, disconnects the output power supply of the DCDC power module U11, stops supplying power to the LVDS high-definition camera, and at the same time, the microprocessor U1 controls the I/O5 to output a high level, so that the light emitting diode D6 is normally on, and performs an overcurrent abnormal prompt.
The invention is applied to the vehicle-mounted display terminal with the LVDS high-definition camera function, is used for realizing the state detection and control and the fault reminding of the vehicle-mounted LVDS high-definition camera, and is convenient for the installation and the debugging of the high-definition camera on the vehicle. The method has the advantages of low cost, convenient application, automatic real-time monitoring, fault reminding and the like.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. A state monitoring circuit of vehicle-mounted electronic equipment comprises a microprocessor, a serializer/deserializer, a DCDC power module and a camera module, wherein the DCDC power module is connected with the serializer/deserializer, and data communication is realized between the microprocessor and the camera module through the serializer/deserializer; the method is characterized in that: the device also comprises a current detection module, a comparison module and a switch module; the switch module is connected with the DCDC power supply module to control the on or off of power supply; the input end of the current detection module is connected with the output end of the DCDC power supply module so as to detect output current and convert the output current into voltage; the input end of the comparison module is connected with the output end of the current detection module to carry out voltage comparison; the microprocessor is connected with the output end of the comparison module to control the state of the switch module according to the comparison result.
2. The status monitoring circuit of an in-vehicle electronic apparatus according to claim 1, wherein: the current detection module is a current detection amplifier.
3. The status monitoring circuit of vehicular electronic equipment according to claim 1, wherein the comparing module comprises a first comparator, a power source VCC, a resistor R11, a resistor R12, a diode D3, a diode D5, a resistor R13 and a resistor R14; the positive input end of the first comparator is connected with the cathode of a diode D3, and the anode of a diode D3 is connected with the output end of the current detection module; the negative input end of the first comparator is connected with the negative electrode of the diode D5, one end of the resistor R12 and one end of the resistor R11; the other end of the resistor R11 is connected with a power supply VCC, and the other end of the resistor R12 and the anode of the diode D5 are grounded; one end of the resistor R13 is connected with the output end of the first comparator, and the other end of the resistor R14 is connected with one end of the resistor R14 and the microprocessor; the other end of the resistor R14 is connected to ground.
4. The status monitoring circuit of claim 1, wherein the comparing module comprises a second comparator, a power source VCC, a resistor R3, a resistor R4, a resistor R6, a diode D4, a diode D1; the positive input end of the second comparator is connected with the negative electrode of a diode D4, and the positive electrode of a diode D4 is connected with the output end of the current detection module; the negative input end of the second comparator is connected with the negative electrode of the diode D1, one end of the resistor R4 and one end of the resistor R3; the other end of the resistor R3 is connected with a power supply VCC, and the other end of the resistor R4 and the anode of the diode D1 are grounded; one end of the resistor R5 is connected with the output end of the second comparator, and the other end of the resistor R6 is connected with one end of the resistor R6 and the microprocessor; the other end of the resistor R6 is connected to ground.
5. The status monitor circuit for vehicular electronic equipment according to claim 1, wherein said switch module comprises a transistor Q1 and a resistor R1; the base electrode of the triode Q1 is connected with one end of a resistor R1, the collector electrode is connected with the DCDC power supply module, and the emitting electrode is grounded; the other end of the resistor R1 is connected to the microprocessor.
6. The status monitoring circuit of an in-vehicle electronic apparatus according to claim 1, wherein: and the state indicating module is connected with the microprocessor.
7. The status monitoring circuit of an in-vehicle electronic apparatus according to claim 6, wherein: the state indicating module comprises a triode Q2, a light emitting diode D2 and a resistor R10; the base electrode of the triode Q2 is connected with the microprocessor, the collector electrode is connected with the negative electrode of the light emitting diode D2, and the emitter electrode is grounded; the anode of the LED D2 is connected to one end of a resistor R10, and the other end of R10 is connected to a power supply VCC.
8. The status monitoring circuit of an in-vehicle electronic apparatus according to claim 6, wherein: the state indicating module comprises a triode Q3, a light emitting diode D6 and a resistor R10; the base electrode of the triode Q3 is connected with the microprocessor, the collector electrode is connected with the negative electrode of the light emitting diode D6, and the emitter electrode is grounded; the anode of the LED D6 is connected to one end of a resistor R10, and the other end of R10 is connected to a power supply VCC.
9. A state monitoring method of vehicle-mounted electronic equipment is used for detecting the working state of a camera module; the camera module and the microprocessor realize data communication through a serializer/deserializer and supply power through a DCDC power module; the method is characterized in that: and the current detection module is used for detecting the output current of the DCDC power supply module and converting the output current into voltage, the voltage is input into the comparison module for voltage comparison, and the DCDC power supply module is controlled to keep or close power supply or control the restart of the camera module according to the comparison result.
10. The state monitoring method of a vehicle-mounted electronic device according to claim 9, characterized in that: the comparison result comprises that the camera is in a normal working state or is not normally started or is in an open circuit or in an overcurrent state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910585233.5A CN112180183A (en) | 2019-07-01 | 2019-07-01 | State monitoring circuit and method for vehicle-mounted electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910585233.5A CN112180183A (en) | 2019-07-01 | 2019-07-01 | State monitoring circuit and method for vehicle-mounted electronic equipment |
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| CN112180183A true CN112180183A (en) | 2021-01-05 |
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| CN201910585233.5A Pending CN112180183A (en) | 2019-07-01 | 2019-07-01 | State monitoring circuit and method for vehicle-mounted electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113400937A (en) * | 2021-04-15 | 2021-09-17 | 浙江吉利控股集团有限公司 | Vehicle entertainment information display system and vehicle |
| CN114760409A (en) * | 2021-11-24 | 2022-07-15 | 广州汽车集团股份有限公司 | Vehicle camera control method and device |
-
2019
- 2019-07-01 CN CN201910585233.5A patent/CN112180183A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113400937A (en) * | 2021-04-15 | 2021-09-17 | 浙江吉利控股集团有限公司 | Vehicle entertainment information display system and vehicle |
| CN114760409A (en) * | 2021-11-24 | 2022-07-15 | 广州汽车集团股份有限公司 | Vehicle camera control method and device |
| CN114760409B (en) * | 2021-11-24 | 2023-03-28 | 广州汽车集团股份有限公司 | Vehicle camera control method and device |
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