Vehicle sensing system, electronic controller unit, sensor power supply and power supply circuit

Abstract

The invention provides a vehicle sensing system, an electronic controller unit, a sensor power supply and a power supply circuit, which are applied to the technical field of vehicle sensor power supply, and the power supply circuit comprises two diodes, an operational amplifier, an electronic switch and a detection control unit, the electronic switch and the detection control unit form a core circuit unit for short circuit detection and protection, and electronic devices of the power supply circuit can be domestic mature and universal devices, can be quickly obtained in a commercially available mode, and can be quickly integrated to form a functional circuit unit. And the devices can also be subjected to integrated circuit design, so that a rapid alternative scheme is provided for imported integrated circuits in the domestic automobile industry.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle sensor power supply, and in particular to a vehicle sensor system and an electronic controller unit, a sensor power supply, and a power supply circuit. Background Art

[0002] In electronic control units such as ECU (Electronic Control Unit, also known as the "on-board computer" of a car), it is often necessary to power external circuits (such as sensors). For example, the power supply voltage requirement is generally 5V, and the current requirement is 70-100mA per channel.

[0003] Since the ECU supplies power to external sensors through external wiring harnesses, and these wiring harnesses may cause short circuit faults in the power supply lines in actual use, it is necessary to consider short circuit protection of the 5V power supply output in the ECU to ensure that the hardware circuits in the ECU are not damaged in the event of a short circuit fault.

[0004] In the existing solutions, short-circuit protection of external sensor power supply in ECU is implemented by using imported integrated circuit devices, which are usually called trackers, such as TLE4254 provided by Infineon Technologies and BD42540FJ-C provided by Rohm.

[0005] However, this type of imported integrated circuit device not only has complex circuits, but can only provide short-circuit protection when a short circuit occurs. The ECU cannot correctly diagnose what type of fault it is, making it inconvenient to repair the fault and also inconvenient to use in more occasions. Summary of the invention

[0006] In view of this, the embodiments of this specification provide a vehicle sensor system and an electronic controller unit, a sensor power supply, and a power supply circuit, so as to provide a power supply and fault detection solution to replace the imported integrated circuit Tracker in situations where the working voltage accuracy requirement is not high.

[0007] The embodiments of this specification provide the following technical solutions:

[0008] The embodiments of this specification provide 1. a power supply circuit, comprising: a first diode, a second diode, an operational amplifier, a detection control unit, and an electronic switch;

[0009] The cathode of the first diode is connected to the reference voltage, the anode of the first diode is connected to the non-inverting input terminal of the operational amplifier and connected to the first potential, and the inverting input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, so that the voltage output from the output terminal of the operational amplifier follows the change of the first potential, wherein the voltage value of the reference voltage minus the first potential is the voltage drop of the first diode;

[0010] An anode of the second diode is connected to the output terminal of the operational amplifier, and a cathode of the second diode is connected to the input terminal of the electronic switch;

[0011] The control end of the electronic switch is connected to the control output end of the detection control unit, and the output end of the electronic switch is connected to the detection end of the detection control unit and serves as a power supply end for providing a power supply voltage to the outside;

[0012] Wherein, the detection control unit is used to detect the supply voltage and determine whether the supply voltage has a short-circuit fault based on the detection result; wherein, when it is determined that a short-circuit fault exists, the short-circuit fault type corresponding to the short-circuit fault is recorded, and a shutdown signal is sent to the control end of the electronic switch to put the electronic switch in an off state; when it is determined that no short-circuit fault exists, an open signal is sent to the control end of the electronic switch to put the electronic switch in an on state.

[0013] Preferably, the first diode and the second diode are both diodes with a positive temperature coefficient, or the first diode and the second diode are both diodes with a negative temperature coefficient.

[0014] Preferably, the model and specification of the first diode are the same as the model and specification of the second diode.

[0015] Preferably, the detection control unit includes a sampling feedback unit and a processing circuit, the sampling feedback unit is used to sample the supply voltage to form a feedback voltage; the processing circuit is used to detect the feedback voltage to determine whether the supply voltage has a short circuit fault based on the detection result of the feedback voltage.

[0016] Preferably, the processing circuit comprises a first comparator and a second comparator;

[0017] The first comparator is used to detect whether the power supply voltage is short-circuited to the power supply terminal according to the feedback voltage, and output a first comparison result when the power supply voltage is short-circuited to the power supply terminal;

[0018] The second comparator is used for detecting whether the supply voltage is short-circuited to the ground according to the feedback voltage, and outputting a second comparison result when the supply voltage is short-circuited to the ground.

[0019] Preferably, the processing circuit comprises an analog-to-digital conversion circuit, wherein the analog-to-digital conversion circuit is used to convert the feedback voltage into a corresponding digital quantity, and the numerical value of the digital quantity is used to indicate whether there is a short-circuit fault in the power supply voltage and the short-circuit fault type corresponding to the short-circuit fault;

[0020] Wherein, the conversion bit number of the analog-to-digital conversion circuit includes at least one of the following bit numbers: 8 bits, 10 bits, 12 bits, 14 bits, and 16 bits.

[0021] Preferably, the first comparator, the second comparator or the analog-to-digital conversion circuit is a circuit unit in a microcontroller.

[0022] An embodiment of the present specification also provides a vehicle sensor power supply, comprising an external wiring harness and a plurality of power supply circuits as described in any one of the embodiments of the present specification, wherein the output port in each of the power supply circuits provides a working voltage to the vehicle sensor through the corresponding external wiring harness.

[0023] An embodiment of this specification also provides a vehicle electronic controller unit, the vehicle electronic controller unit comprising a vehicle sensor power supply as described in any one of the embodiments of this specification, wherein the vehicle sensor power supply is used to provide an operating voltage to a vehicle sensor;

[0024] Alternatively, the vehicle electronic controller unit includes several power supply circuits as described in any one of the items in this specification, wherein the power supply circuit is arranged on a printed circuit board of the vehicle electronic controller unit to provide an operating voltage to other circuits arranged on the printed circuit board, or to provide an operating voltage to a sensor circuit located outside the printed circuit board through an external wiring harness.

[0025] The embodiments of this specification also provide a vehicle sensing system, comprising: a plurality of sensors, a power supply harness, and a vehicle electronic controller unit as described in any one of the embodiments of this specification;

[0026] Wherein, the vehicle electronic controller unit provides working voltage to several sensors respectively through the power supply harness.

[0027] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0028] By using multiple mature conventional devices such as diodes and operational amplifiers, a power supply circuit with external power supply, short-circuit detection and short-circuit protection is built. While supplying power to external sensors and realizing short-circuit protection, the type of short-circuit fault can be detected in time. Moreover, because the devices used in the overall circuit are all mature and common domestic electronic components, they can not only be commercially available in the domestic market and not easily affected by the supply capacity of imported devices, but these devices can also be quickly integrated together to form new circuit units, or even new integrated circuit devices, which solves the dilemma of no relevant alternative solutions in China, and also provides a new research and development idea for the domestic research and development of foreign imported integrated device Trackers, making up for the technical shortcomings of domestic technicians who do not have corresponding research and development experience, and can improve the speed and efficiency of domestic technology research and development in this technical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of the power supply circuit in this application;

[0031] Figure 2 It is a schematic diagram of the simulation result of the circuit for forming the power supply voltage in this application. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0033] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0034] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0035] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0037] At present, the power supply scheme of external sensors used in vehicles basically adopts imported integrated device Tracker to realize power supply and short circuit detection. Although this imported device can provide an integrated solution of power supply and short circuit protection, it can only perform short circuit protection after a short circuit occurs, and cannot indicate what type of short circuit fault it is, which is very inconvenient to locate the fault, and troubleshooting and repair are very difficult.

[0038] Among them, the types of short circuits may include: short circuit to power supply and short circuit to ground. Any short circuit failure may easily cause a vehicle (or a vehicle electronic control unit, ECU) to fail, or even cause a vehicle accident.

[0039] In addition, such imported integrated circuit devices are provided by foreign component suppliers. Given the increasing shortage of semiconductor devices in recent years, the supply of such devices is tight and the lead time is long. Moreover, there is still no relevant alternative solution in China. Even if such devices are self-developed in China, due to the lack of relevant R&D experience and the extremely long R&D cycle, the corresponding integrated circuit cannot be formed as an alternative solution in the short term, which cannot alleviate the current urgent application needs for such imported integrated circuit devices.

[0040] Therefore, the embodiments of this specification propose a power supply circuit solution that can provide working voltage for vehicle sensors: by using multiple mature conventional devices such as diodes and operational amplifiers, a power supply circuit with external power supply, short-circuit detection and short-circuit protection is built, so that the short-circuit fault type can be detected in time while powering the external sensor and realizing short-circuit protection. At the same time, because the devices used in the overall circuit are all general mature devices, not only can they be commercially available in the domestic market, but these devices can also be quickly integrated together to form new circuit units, or even new integrated circuit devices, which solves the dilemma of no relevant alternative solutions in China, and also provides a new idea for the domestic research and development of foreign device Trackers, making up for the technical shortcomings of domestic technicians who do not have corresponding research and development experience, and can improve the speed and efficiency of domestic technology research and development in this technical field.

[0041] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0042] like Figure 1 As shown, a power supply circuit for a vehicle sensor provided in an embodiment of the present specification includes: a first diode D1, a second diode D2, an operational amplifier A1, a detection control unit 10 and an electronic switch SW1.

[0043] In implementation, the connection relationship between various circuit components is shown as follows:

[0044] The cathode of the first diode D1 is connected to a reference voltage (eg Figure 1 The anode of the first diode D1 is connected to the non-inverting input terminal of the operational amplifier A1 and is connected to the first potential V1 (eg Figure 1 As shown in the figure, the first potential V1 is a potential obtained by dividing the power supply VDD1 by resistors R1 and R2, and the inverting input terminal of the operational amplifier A1 is connected to the output terminal of the operational amplifier to form a voltage follower, so that the voltage output from the output terminal of the operational amplifier A1 follows the change of the first potential;

[0045] The anode of the second diode D2 is connected to the output terminal of the operational amplifier A1, and the cathode of the second diode D2 is connected to the input terminal of the electronic switch SW1;

[0046] The control end of the electronic switch SW1 is connected to the control output end of the detection control unit 10 , and the output end of the electronic switch SW1 is connected to the detection end of the detection control unit 10 and serves as a power supply end for providing a power supply voltage to the outside.

[0047] Under the aforementioned circuit connection relationship, the working principle of the overall circuit is shown as follows:

[0048] First, the first power source VDD forms a first potential V1 at the non-inverting input terminal of the operational amplifier A under the voltage division of the resistors R1 and R2, and under the joint action of the reference voltage VCC and the first diode D1, wherein the first potential V1, the reference voltage VCC and the voltage drop of the first diode D1 (abbreviated as Vd1_drop) satisfy the following relationship: V1=VCC+Vd1_drop;

[0049] Then, when the operational amplifier is a voltage follower, the first potential V1 is transmitted to the anode of the second diode D2, and after the voltage drop of the second diode D2, the second potential V2 is formed, wherein the second potential V2, the first potential V1 and the voltage drop of the second diode D2 (abbreviated as Vd2_drop) satisfy the following relationship: V2 = V1-Vd2_drop, that is, V2 = VCC+(Vd1_drop-Vd2_drop); therefore, if the voltage drops of the first diode D1 and the second diode D2 are the same (for example, the two diodes are exactly the same model), the voltage value of the second potential V2 will be the same as the reference voltage VCC, and the current size can be determined by the operational amplifier A1;

[0050] Finally, the electronic switch SW1 forms a circuit or an open circuit under the control of the detection control unit 10 (or the processing circuit 101), wherein when the electronic switch SW1 is in the on state, after the second potential V2 is outputted by the electronic switch SW1, the power supply voltage Vout is outputted at the power supply end of the power supply circuit, wherein Vout=V2 (assuming that the voltage drop when the electronic switch SW1 is in the on state is zero), that is, Vout=VCC+(Vd1_drop-Vd2_drop), and when the electronic switch SW1 is in the open circuit state, the second potential V2 cannot be outputted by the electronic switch SW1, and at this time, there is no voltage at the power supply end of the power supply circuit, that is, Vout=0;

[0051] In addition, when the electronic switch SW1 is in the on state, that is, the power supply output terminal outputs the power supply voltage Vout, the detection control unit 10 performs real-time voltage value detection on the power supply voltage Vout, so that the processing circuit 101 can determine whether there is a short circuit fault in the power supply voltage Vout according to the detection result.

[0052] The process of short circuit detection performed by the detection control unit 10 (or the processing circuit 101) is shown as follows:

[0053] Through the sampling circuit (such as Figure 1 The voltage-dividing feedback branch formed by the resistors R3 and R4 shown in the figure) obtains the corresponding feedback voltage V from the supply voltage Vout FB When the processing circuit 101 determines that there is a short-circuit fault, it sends a shut-off signal to the control end of the electronic switch SW1 in real time to put the electronic switch in a shut-off state, and the processing circuit 101 also records the short-circuit fault type corresponding to the short-circuit fault in time, so as to facilitate subsequent maintenance according to the recorded short-circuit fault type;

[0054] When the processing circuit 101 determines that there is no short circuit fault, an opening signal is sent to the control terminal of the electronic switch SW1 to put the electronic switch into a conducting state.

[0055] For example, when the power supply terminal is short-circuited, the feedback voltage V detected by the detection control unit 10 is FB The feedback voltage will be much higher than that corresponding to normal operation (it can be judged by setting a threshold), and it can be recorded as a short circuit to the power supply fault type;

[0056] For example, when short-circuited to ground, the feedback voltage V detected by the detection control unit 10 is FB The feedback voltage will be much lower than that corresponding to normal operation (which can be determined by setting a threshold), and at this time it can be recorded as a short circuit to ground fault type.

[0057] However, the existing solution of using imported integrated circuit Trackers for short-circuit protection cannot determine the type of short-circuit fault, which makes subsequent maintenance inconvenient. It is also easily affected by the supply factors of imported integrated circuits and cannot carry out normal production and maintenance.

[0058] The purpose of each component in the power supply circuit is briefly described as follows:

[0059] The first diode D1, the second diode D2 and the operational amplifier A1 together form a stable voltage as the power supply voltage, wherein the first diode D1 and the second diode D2 are arranged in the circuit in a manner that can be used to offset the influence of the two diodes on the output power supply voltage as much as possible; therefore, when the difference between the first diode D1 and the second diode D2 is small (such as the difference in diodes that can meet the application requirements of the power supply voltage), for example, after the two diodes are preferably diodes of the same model, even if the voltage drop of the diode changes greatly with its own temperature, the voltage drop output by all the second diodes D2 is compensated by the voltage drop of D1, thereby ensuring the stability of the output voltage at different temperatures.

[0060] For the power supply needs of external circuits, such as voltage needs, this can be achieved by setting the reference voltage VCC; and for the need for working current, this can be achieved by selecting the operational amplifier;

[0061] In addition, the second diode D2 can also realize a protection function in the event of a short circuit. For example, when the external circuit is short-circuited to the power supply, the second diode D2 is called an anti-reverse connection diode to protect subsequent devices such as the operational amplifier; for example, when the external circuit is short-circuited to the ground, the operational amplifier and the second diode constitute a current limit to avoid device burning after a short circuit to the ground.

[0062] Therefore, after adopting the aforementioned power supply circuit, not only are the devices mature general devices that can be obtained from the market at any time, but these devices are also very convenient to develop, design, and produce in China, and there is no need to worry about the impact of device supply factors. In addition, the aforementioned power supply circuit completes power supply voltage sampling detection through a detection control unit. The power supply circuit can timely record the fault type corresponding to the short-circuit fault and complete reliable shutdown through an electronic switch. No matter what type of short circuit, it can play a good protective role and is very convenient to carry out later maintenance according to the recorded short-circuit fault type. It is even very convenient to provide the maintenance personnel with the fault type, so that the maintenance personnel can inspect the damage of other circuits connected to the power supply circuit.

[0063] In some embodiments, the circuit form of the electronic switch may preferably be a transistor, or may preferably be an electronic device in other circuit forms (such as an electronic switch of an integrated circuit).

[0064] In some examples, the electronic switch may include at least one of the following transistors: a triode, a field effect transistor. By selecting a transistor, not only can the function of the electronic switch be realized, but the cost of the transistor is lower, the device reliability is higher, the device size is smaller, and it is easier to integrate the design in the power supply circuit. It should be noted that the transistor model specifications are not limited here.

[0065] In some implementations, by selecting two diodes, not only the device selection process can be simplified, but also the power supply voltage output by the power supply circuit can be ensured to be more accurate.

[0066] In one example, the first diode D1 and the second diode D2 are selected as diodes with positive temperature coefficients, or the first diode D1 and the second diode D2 are selected as diodes with negative temperature coefficients. Therefore, the power supply voltage Vout is not easily affected by the diodes, wherein Vout=VCC+(Vd1_drop-Vd2_drop), and since the temperature coefficients of the two diodes are both positive temperature coefficients or negative temperature coefficients, the diodes have little effect on the output power supply voltage.

[0067] In one example, two diodes with the same temperature coefficient or a small difference can be preferred. For example, the model specifications of the first diode D1 and the second diode D2 are selected to be the same model specifications. In this case, the voltage drops of the two diodes are the same, so the output power supply voltage is the same as the reference voltage VCC, that is, Vout = VCC.

[0068] like Figure 2 As shown, for the circuit simulation of the above power supply circuit, the two diodes can be selected as 1N4148, the op amp can be selected as ADA4891, and the other resistors can be selected as Figure 2 As shown in the figure, assuming that the load RLoad is 100Ω, the simulation results of the probe terminal Probe2 show that the supply voltage Vout is about 4.85V and the current is about 48mA. Moreover, through the selection of the op amp, the supply current of this power supply circuit can reach 200mA, so this power supply circuit can meet the power supply needs of most circuits in the vehicle for 5V power supply.

[0069] In addition, after the resistors R4 and R5 divide the output power supply voltage Vout for sampling, the sampling result can be sent to the analog-to-digital port (AD Port) of the microcontroller (MCU) for processing, and then according to the processing result, it can be timely known whether there is a short circuit fault and the corresponding short circuit fault type when a short circuit occurs.

[0070] In some implementations, the output power supply voltage may be sampled and processed, and the on-off control of the electronic switch may be performed according to the processing result.

[0071] like Figure 1Schematically, the detection control unit 10 includes a sampling feedback unit and a processing circuit, wherein the sampling feedback unit is used to sample the supply voltage to form a feedback voltage V FB For example, a voltage divider circuit composed of resistors R3 and R4 is used as a sampling feedback unit to form a feedback voltage V FB ; The processing circuit 101 is used to feedback voltage V FB Detection is performed based on the feedback voltage V FB The detection result determines whether the power supply voltage Vout has a short circuit fault.

[0072] It should be noted that the feedback voltage V FB The processing can be in the form of a circuit based on analog signal processing or in the form of digital signal processing based on analog-to-digital conversion.

[0073] In one example, a comparator is used to compare the feedback voltage V FB Detection processing, so that by setting the comparison threshold of the comparator, the two short-circuit faults can be detected and judged.

[0074] Specifically, the processing circuit includes a first comparator and a second comparator. The first comparator is used to calculate the feedback voltage V BF The second comparator is used to detect whether the power supply voltage Vout is short-circuited to the power supply terminal, and output a first comparison result when the power supply voltage Vout is short-circuited to the power supply terminal; the second comparator is used to detect whether the power supply voltage Vout is short-circuited to the power supply terminal according to the feedback voltage V BF It is detected whether the power supply voltage Vout is short-circuited to the ground, and a second comparison result is output when the power supply voltage Vout is short-circuited to the ground.

[0075] The feedback voltage is detected and judged by two comparators respectively, so that the electronic switch can be controlled according to the comparison results output by the comparators. For example, whether the first comparator or the second comparator determines that there is a short circuit fault, the electronic switch is controlled to switch to the off state. In addition, the processing circuit can also record the first comparison result that the first comparator detects a short circuit to the power supply terminal as a short circuit to the power supply fault type, and the second comparison result that the second comparator detects a short circuit to the ground is recorded as a short circuit to the ground fault type.

[0076] For example, when the external line is short-circuited to the positive pole of the power supply, the power supply voltage Vo must be higher than the voltage value in the normal state, so the comparator circuit outputs the corresponding comparison output result to reflect the abnormal state of the short circuit to the power supply; for another example, when the external line is short-circuited to the ground, the power supply voltage Vo must be lower than the voltage value in the normal state, so the comparator circuit outputs the corresponding comparison output result to reflect the abnormal state of the short circuit to the ground. Therefore, based on the comparison output result of the comparator, the processor can not only detect the existence of a short circuit fault in a timely manner, but also detect the corresponding short circuit fault type.

[0077] It should be noted that the comparator circuit is a circuit unit with a comparator as the core. One of the inputs in the comparator can be the aforementioned feedback voltage signal, and the other inputs can set corresponding reference voltages, wherein the reference voltage can be directly or indirectly derived from the second voltage output by the second regulator, which is not limited here.

[0078] In implementation, it is preferred that a window comparator constitutes the core unit of the aforementioned comparator circuit, and then the window comparator can obtain the comparison output result corresponding to the short-circuit fault according to the feedback voltage. Specifically, the comparator circuit includes a window comparator, wherein the window comparator is used to trigger the output of the corresponding comparison output result according to the input feedback voltage, so as to reflect the type of short-circuit fault. For example, in the window comparator, when the feedback voltage is higher than the first reference voltage, the corresponding level is flipped to reflect the existence of a short-circuit fault, and the fault type represents a short circuit to the power supply; for another example, when the feedback voltage is lower than the second reference voltage, the corresponding level is flipped to reflect the existence of a short-circuit fault, and the fault type represents a short circuit to the ground; for example, when the feedback voltage is between the first reference voltage and the second reference voltage, no flip output occurs to reflect that no short-circuit fault occurs, that is, there is no short-circuit fault.

[0079] In one example, an analog-to-digital converter is used to convert the feedback voltage V FB Detection and processing, so that the two types of short-circuit faults can be detected and judged by the size of the digital quantity.

[0080] Specifically, the processing circuit includes an analog-to-digital conversion circuit, wherein the analog-to-digital conversion circuit is used to convert the feedback voltage V BF Converted into a corresponding digital quantity, wherein the value of the digital quantity is used to characterize whether there is a short-circuit fault in the power supply voltage Vout and the short-circuit fault type corresponding to the short-circuit fault.

[0081] In implementation, the conversion bit number of the analog-to-digital conversion circuit includes at least one of the following bit numbers: 8 bits, 10 bits, 12 bits, 14 bits, 16 bits, 24 bits, etc.

[0082] By adopting an analog-to-digital converter, the normal digital quantity corresponding to the power supply voltage, the digital quantity short-circuited to the power supply end, the digital quantity short-circuited to the ground, etc. can be set according to different application scenarios.

[0083] In some implementations, a microprocessor (also referred to as a microcontroller, MCU) having the aforementioned comparator, analog-to-digital converter and other circuit units may be used, that is, the aforementioned first comparator, second comparator, analog-to-digital conversion circuit, etc. may be circuit units in the microcontroller, thereby simplifying the circuit form and improving processing capabilities. It should be noted that this type of MCU is also a mature general-purpose circuit in China, and is therefore not easily affected by the supply of imported components.

[0084] In some embodiments, the processing circuit can use the indicating unit to indicate and alarm the detected short-circuit fault type data, which is convenient for later maintenance and detection. Therefore, the power supply circuit can also include an indicating unit (not shown in the figure), wherein the indicating unit is used to indicate the corresponding state of the short-circuit fault type output by the processor. It should be noted that the indicating unit can be an indicator light, an audible and visual alarm, a data display, etc., which is not specifically limited here.

[0085] In summary, in view of the fact that there are no alternative solutions for imported integrated circuit trackers in China, various embodiments of this specification provide different circuit solutions based on mature and common domestic devices, and the circuit solutions are also very convenient for integrated circuit design in China, providing a very worthy reference for the industry to break through the constraints of imported devices. In addition, since the circuits are all based on mature and common electrical components of domestic people, in terms of integrated circuit design, they can make up for the lack of R&D experience of industry personnel, and can quickly form the mentioned solutions in the industry.

[0086] Based on the same inventive concept, an embodiment of the present specification further provides a vehicle sensor power supply, wherein the vehicle sensor power supply is used to provide working power for vehicle sensors.

[0087] In implementation, the vehicle sensor power supply includes an external wiring harness and a plurality of power supply circuits as described in any of the foregoing embodiments in this specification, wherein the output port in each power supply circuit provides an operating voltage to the vehicle sensor through the corresponding external wiring harness.

[0088] It should be noted that the operating voltage can be set according to the power supply requirements of the vehicle sensor, that is, the reference voltage VCC in the aforementioned power supply circuit can meet the power supply voltage requirements, and the required operating current can be provided by selecting the operational amplifier.

[0089] Based on the same inventive concept, the embodiment of this specification also provides a vehicle electronic controller unit (ECU).

[0090] In one example, the vehicle sensor power supply described in any of the foregoing items in this specification can be set in a vehicle electronic controller unit, such as a printed circuit board of an ECU, so that each vehicle sensor power supply can provide an operating voltage to a corresponding vehicle sensor.

[0091] In one example, the power supply circuit described in any of the foregoing items in this specification can be set in a vehicle electronic controller unit, such as a printed circuit board of an ECU, so that each power supply circuit can provide an operating voltage to other circuits arranged on the printed circuit board of the ECU in the vehicle electronic controller unit (ECU), or provide an operating voltage to a sensor circuit located outside the printed circuit board of the ECU through an external wiring harness.

[0092] Based on the same inventive concept, an embodiment of this specification also provides a vehicle sensing system, comprising: a plurality of sensors, a power supply harness, and a vehicle electronic control unit (ECU) as described in any of the aforementioned embodiments in this specification. The vehicle electronic control unit provides working voltage to the plurality of sensors through the power supply harness.

[0093] In this specification, the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiments described later, the description is relatively simple, and the relevant parts can be referred to the partial description of the previous embodiments.

[0094] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A power supply circuit, characterized in that: include: A first diode, a second diode, an operational amplifier, a detection control unit and an electronic switch; The cathode of the first diode is connected to the reference voltage, the anode of the first diode is connected to the non-inverting input terminal of the operational amplifier and connected to the first potential, and the inverting input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, so that the voltage output from the output terminal of the operational amplifier follows the change of the first potential, wherein the voltage value of the reference voltage minus the first potential is the voltage drop of the first diode; An anode of the second diode is connected to the output terminal of the operational amplifier, and a cathode of the second diode is connected to the input terminal of the electronic switch; The control end of the electronic switch is connected to the control output end of the detection control unit, and the output end of the electronic switch is connected to the detection end of the detection control unit and serves as a power supply end for providing a power supply voltage to the outside; Wherein, the detection control unit is used to detect the supply voltage and determine whether the supply voltage has a short-circuit fault based on the detection result; wherein, when it is determined that a short-circuit fault exists, the short-circuit fault type corresponding to the short-circuit fault is recorded, and a shutdown signal is sent to the control end of the electronic switch to put the electronic switch in an off state; when it is determined that no short-circuit fault exists, an open signal is sent to the control end of the electronic switch to put the electronic switch in an on state.

2. The power supply circuit according to claim 1, characterized in that: The first diode and the second diode are both diodes with positive temperature coefficients, or the first diode and the second diode are both diodes with negative temperature coefficients.

3. The power supply circuit according to claim 2, characterized in that: The model and specification of the first diode are the same as the model and specification of the second diode.

4. The power supply circuit according to claim 1, characterized in that: The detection control unit includes a sampling feedback unit and a processing circuit. The sampling feedback unit is used to sample the supply voltage to form a feedback voltage; the processing circuit is used to detect the feedback voltage to determine whether the supply voltage has a short circuit fault based on the detection result of the feedback voltage.

5. The power supply circuit according to claim 4, characterized in that: The processing circuit includes a first comparator and a second comparator; The first comparator is used to detect whether the power supply voltage is short-circuited to the power supply terminal according to the feedback voltage, and output a first comparison result when the power supply voltage is short-circuited to the power supply terminal; The second comparator is used for detecting whether the supply voltage is short-circuited to the ground according to the feedback voltage, and outputting a second comparison result when the supply voltage is short-circuited to the ground.

6. The power supply circuit according to claim 4, characterized in that: The processing circuit includes an analog-to-digital conversion circuit, wherein the analog-to-digital conversion circuit is used to convert the feedback voltage into a corresponding digital quantity, and the value of the digital quantity is used to indicate whether there is a short-circuit fault in the power supply voltage and the type of short-circuit fault corresponding to the short-circuit fault; Wherein, the conversion bit number of the analog-to-digital conversion circuit includes at least one of the following bit numbers: 8 bits, 10 bits, 12 bits, 14 bits, and 16 bits.

7. The power supply circuit according to any one of claims 5 to 6, characterized in that: The first comparator, the second comparator or the analog-to-digital conversion circuit is a circuit unit in a microcontroller.

8. A vehicle sensor power supply, characterized in that: It comprises an external wiring harness and a plurality of power supply circuits as claimed in any one of claims 1 to 7, wherein the output port in each of the power supply circuits provides a working voltage to a vehicle sensor through a corresponding external wiring harness.

9. A vehicle electronic controller unit, characterized in that: The vehicle electronic controller unit comprises the vehicle sensor power supply as claimed in claim 8, wherein the vehicle sensor power supply is used to provide an operating voltage to a vehicle sensor; Alternatively, the vehicle electronic controller unit includes several power supply circuits as described in any one of claims 1 to 7, wherein the power supply circuit is arranged on a printed circuit board of the vehicle electronic controller unit to provide an operating voltage to other circuits arranged on the printed circuit board, or to provide an operating voltage to a sensor circuit located outside the printed circuit board through an external wiring harness.

10. A vehicle sensing system, characterized in that: include: Several sensors; Power supply harness; The vehicle electronic controller unit as claimed in claim 9; Wherein, the vehicle electronic controller unit provides working voltage to several sensors respectively through the power supply harness.

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