Power supply circuit, ultrasonic radar and vehicle

Abstract

The present invention provides a power supply circuit, an ultrasonic radar and a vehicle. The power supply circuit includes a protection diode, whose input end is connected to a voltage source; a filter detection circuit, one end of which is connected between the voltage source and the protection diode and the other end is grounded, and the filter detection circuit is configured to filter the voltage of the voltage source and detect the voltage amplitude of the voltage source; a voltage stabilizing circuit, which is connected between the output end of the protection diode and the voltage output port of the power supply circuit and is configured to output a stable voltage; and a filter circuit, one end of which is connected between the voltage output port and the voltage stabilizing circuit and the other end is grounded, and is configured to filter the voltage output by the voltage stabilizing circuit. The power supply circuit of the present invention can achieve stable voltage output through the synergistic effect of the protection diode, the filter detection circuit, the voltage stabilizing circuit and the filter circuit, and is suitable for a wider input voltage range.

Description

Technical Field

[0001] The present invention generally relates to the field of circuit technology, and in particular to a power supply circuit, an ultrasonic radar and a vehicle. Background Art

[0002] Ultrasonic radar is a device that uses ultrasonic waves to detect targets and measure distance and speed. It is widely used in automobiles, robots, drones and other fields. In ultrasonic radar systems, the signal amplification circuit is a key part, and its function is to amplify the received weak ultrasonic signal for subsequent processing and analysis.

[0003] The existing power supply circuit solutions for vehicle-mounted ultrasonic radars have a relatively limited range of power input voltage values, and it is difficult to meet a wide range of input voltage values; it is also difficult to pass the industry test ISO 7637-2-2004 experimental pulse 5a and ISO16750-2 load dump (pulse P5a) ​​test, and the matching requirements of various electronic components are relatively high, and the cost is high, making it difficult to meet popular needs. In addition, the power output voltage of the existing vehicle-mounted ultrasonic radar power supply circuit is unstable, and it is difficult to meet the stable voltage required by users. Therefore, how to reduce costs, reduce the difficulty of matching various electronic components, and realize a power supply circuit with a wide input voltage range and stable output voltage is a technical problem that needs to be solved in the field of vehicle-mounted ultrasonic radars.

[0004] The contents of the background technology section are merely the technologies known to the inventors and do not necessarily represent the prior art in the field. Summary of the invention

[0005] In view of one or more of the problems existing in the prior art, the present invention provides a power supply circuit, the power supply circuit comprising:

[0006] a protection diode having its input terminal connected to a voltage source;

[0007] A filter detection circuit, one end of which is connected between the voltage source and the protection diode, and the other end of which is grounded, wherein the filter detection circuit is configured to filter the voltage of the voltage source and detect the voltage amplitude of the voltage source;

[0008] a voltage stabilizing circuit connected between the output end of the protection diode and the voltage output port of the power supply circuit and configured to output a stable voltage; and

[0009] The filter circuit has one end connected between the voltage output port and the voltage stabilizing circuit and the other end grounded, and is configured to filter the voltage output by the voltage stabilizing circuit.

[0010] Optionally, the voltage stabilizing circuit includes a first resistor, a second resistor, a voltage stabilizing diode, a first transistor and a second transistor, the emitter of the first transistor is connected to the output end of the protection diode, the first resistor and the voltage stabilizing diode are connected in series, one end of the first resistor is connected to the output end of the protection diode and the emitter of the first transistor, and the other end is connected to the cathode of the voltage stabilizing diode.

[0011] Optionally, the base of the first transistor is connected to the collector of the second transistor, and the collector of the first transistor is connected to the voltage output port.

[0012] Optionally, the base of the second transistor is connected between the first resistor and the voltage-stabilizing diode, and the emitter of the second transistor is connected to the second resistor and grounded through the second resistor.

[0013] Optionally, the collector of the first transistor is connected between the emitter of the second transistor and the second resistor; and the anode of the voltage regulator diode is grounded.

[0014] Optionally, the first transistor includes a PNP transistor; and the second transistor includes an NPN transistor.

[0015] Optionally, the filtering detection circuit includes a first capacitor, a second capacitor, a third capacitor, a third resistor, a fourth resistor and a detection chip interface; wherein the first capacitor and the second capacitor are connected in series, one end of the first capacitor is connected between the voltage source and the protection diode, the other end of the first capacitor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; the detection chip interface is configured to detect the voltage amplitude of the voltage source.

[0016] Optionally, the third resistor and the fourth resistor are connected in series, one end of the third resistor is connected between the voltage source and the protection diode, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded.

[0017] Optionally, the third resistor and the fourth resistor are connected in series, and the detection chip interface is connected between the third resistor and the fourth resistor.

[0018] Optionally, the third capacitor is connected in parallel with the fourth resistor, one end of the third capacitor is connected to the detection chip interface, and a branch circuit formed by the first capacitor and the second capacitor is connected in parallel with a branch circuit formed by the third resistor and the fourth resistor.

[0019] Optionally, the filtering circuit includes a plurality of fourth capacitors connected in parallel, one end of the plurality of fourth capacitors connected in parallel is connected between the voltage stabilizing circuit and the voltage output port, and the other end is grounded.

[0020] Optionally, the power supply circuit is used for a radar, and the radar includes an ultrasonic radar.

[0021] The present invention also provides an ultrasonic radar, comprising:

[0022] a transmitter configured to transmit ultrasonic waves;

[0023] A receiver configured to receive an echo of the ultrasonic wave reflected by an object;

[0024] a processor, coupled to the receiver, configured to determine object information based on the echo; and

[0025] The power supply circuit as described above is configured to output a stable voltage to provide power to at least one of the transmitter, the receiver and the processor.

[0026] The present invention also provides a vehicle, comprising the ultrasonic radar as described above.

[0027] The power supply circuit of the present invention can achieve stable voltage output through the synergistic effect of the protection diode, the filter detection circuit, the voltage stabilizing circuit and the filter circuit, is applicable to a wider input voltage range, reduces the difficulty and cost of matching various electronic components, is applicable to vehicle-mounted ultrasonic radar, meets the requirements of ISO 7637-2—2004 experimental pulse 5a and ISO16750-2 load dump (pulse P5a) ​​experiment, and meets popular needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 Schematic diagram of a power supply circuit according to some embodiments of the present invention is shown.

[0030] Figure 2 Schematic diagrams of power supply circuits according to some preferred embodiments of the present invention are shown.

[0031] Figure 3 The experimental curves obtained based on the input parameters of Table 3 according to some embodiments of the present disclosure are shown.

[0032] Figure 4 A schematic diagram of an ultrasonic radar according to some embodiments of the present invention is shown.

[0033] Figure 5 A schematic diagram of a vehicle according to some embodiments of the present invention is shown. DETAILED DESCRIPTION

[0034] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0039] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] The invention provides a power supply circuit. Figure 1 Schematic diagram of a power supply circuit 100 according to some embodiments of the present invention is shown. Figure 1 As shown, the power supply circuit 100 includes a protection diode D1, a filter detection circuit 10, a voltage stabilizing circuit 20 and a filter circuit 30. The input end of the protection diode D1 is connected to the voltage source POWER. One end of the filter detection circuit 10 is connected between the voltage source POWER and the protection diode D1, and the other end is grounded. The filter detection circuit 10 is configured to filter the voltage of the voltage source POWER and detect the voltage amplitude of the voltage source POWER. The voltage stabilizing circuit 20 is connected between the output end of the protection diode D1 and the voltage output port VCC of the power supply circuit, and is configured to output a stable voltage. One end of the filter circuit 30 is connected between the voltage output port VCC and the voltage stabilizing circuit 20, and the other end is grounded, and is configured to filter the voltage output by the voltage stabilizing circuit 20.

[0041] Figure 2 Schematic diagrams of power supply circuits according to some preferred embodiments of the present invention are shown. Figure 2 As shown, the input terminal of the protection diode D1 (for example, Figure 2 The first end of the protection diode D1 shown is connected to the voltage source POWER, the output end (for example, Figure 2 The second end of the protection diode D1 shown in the figure is connected to the voltage stabilizing circuit 20. The protection diode D1 is connected between the power input port and the voltage stabilizing circuit, so that the voltage stabilizing circuit can work normally and avoid the voltage provided by the voltage source POWER being too high or having a large amplitude to damage the electronic components. The voltage stabilizing circuit 20 is connected between the output end of the protection diode D1 and the voltage output port VCC of the power circuit, and is configured to output a stable voltage. The other end of the voltage stabilizing circuit 20 is grounded.

[0042] like Figure 2 As shown, the voltage stabilizing circuit 20 includes a first resistor R1, a second resistor R2, a voltage stabilizing diode Z1, a first transistor Q1, and a second transistor Q2. The first resistor R1 and the voltage stabilizing diode Z1 are connected in series, one end of the first resistor R1 is connected between the output end of the protection diode D1 and the emitter e of the first transistor Q1, and the other end is connected to the negative electrode of the voltage stabilizing diode Z1. The positive electrode of the voltage stabilizing diode Z1 is grounded. The emitter e of the first transistor Q1 is connected to the output end of the protection diode D1, the base b of the first transistor Q1 is connected to the collector c of the second transistor Q2, and the collector c of the first transistor Q1 is connected to the voltage output port VCC. The collector c of the first transistor Q1 is also connected between the emitter e of the second transistor Q2 and the second resistor R2. The base b of the second transistor Q2 is connected between the first resistor R1 and the voltage stabilizing diode Z1, and the emitter e of the second transistor Q2 is connected to the second resistor R2, and is grounded through the second resistor R2. The first transistor Q1 can be a PNP transistor. The second transistor Q2 may be an NPN transistor.

[0043] The voltage source POWER provides a power supply voltage to the base b of the second transistor Q2 through the protection diode D1 and the first resistor R1. The current limiting of the first resistor R1 can protect the voltage zener diode Z1 and the second transistor Q2. The first resistor R1 and the voltage zener diode Z1 are connected in series so that the two (for example, Figure 2 The voltage at the connection point A) shown is a relatively stable voltage value, that is, the voltage connected to the base b of the second transistor Q2 is a relatively stable value, which can provide a stable voltage to the second transistor Q2, so that the voltage input to the second transistor Q2 can be a reference voltage. The voltage regulator diode Z1 plays a role in power supply clamping protection. When the power supply voltage is higher than the voltage regulation value of the voltage regulator diode Z1, the part of the voltage exceeding the voltage regulation value can pass through the voltage regulator diode Z1 to the ground, so that the voltage regulator diode Z1, the second transistor Q2, and the first resistor R1 connection point always maintain a preset voltage.

[0044] When the base b and the emitter e of the second transistor Q2 are turned on, the voltage at the connection point between the emitter e of the second transistor Q2 and the second resistor R2 (for example, Figure 2 The connection point B shown is the voltage of the connection point of the voltage stabilizing diode Z1, the second transistor Q2, and the first resistor R1 (for example, Figure 2The voltage drop (0.6V) between the base b and the emitter e of the second transistor Q2 is subtracted from the connection point A shown in the figure. When the base b and the emitter e of the second transistor Q2 are turned on, the collector c and the emitter e of the second transistor Q2 are turned on synchronously, so that the first transistor Q1 is also turned on synchronously, that is, the base b and the collector c of the first transistor Q1 are turned on synchronously, so that the collector c of the first transistor Q1 has a voltage output, and the voltage output port VCC has a voltage output. The output voltage is the connection point of the voltage stabilizing diode Z1, the second transistor Q2, and the first resistor R1 (for example, Figure 2 The voltage at the connection point A) shown is minus the voltage drop of 0.6V between the base b and the emitter e of the second transistor Q2.

[0045] The emitter e of the second transistor Q2 is connected to the collector c of the first transistor Q1 to form a complementary amplifier circuit, which can increase the output current of the emitter e of the second transistor Q2, increase the output current of the collector c of the first transistor Q1, increase the output current capacity of the power supply circuit, and increase the gain of the power supply circuit. The voltage clamp of the second resistor R2 can prevent the emitter e of the second transistor Q2 from connecting to the second resistor R2 (for example, Figure 2 The potential of the connection point B) shown in the figure suddenly changes, so that the voltage at the connection point between the emitter e of the second transistor Q2 and the second resistor R2 is a stable voltage, further ensuring the voltage stability of the voltage output port VCC.

[0046] In some embodiments, the input voltage range of the voltage source POWER can be 0 to 80V (or even higher), and the voltage of the voltage output port VCC can maintain a relatively stable voltage value. For example, the input voltage of the voltage source POWER is 40V, and the voltage of the voltage output port VCC is about 8.5V. For another example, the input voltage of the voltage source POWER is 60V, and the voltage of the voltage output port VCC is about 8.5V. For another example, the input voltage of the voltage source POWER is 80V, and the voltage of the voltage output port VCC is about 8.5V. It should be noted that this is only an exemplary description and does not constitute a limitation of the present invention. The input voltage of the voltage source POWER can take any voltage value between 0 and 80V. The output voltage of the voltage output port VCC depends on the voltage stabilization value of the voltage stabilizing diode Z1, the voltage drop between the base b and the emitter e of the second transistor Q2, and the voltage division of the second resistor R2. For example, the voltage regulation value of the voltage stabilizing diode Z1 is 9.1V, the resistance value of the second resistor R2 is 10000Ω, the voltage at the connection point A minus the conduction voltage drop of the second transistor Q2 (the voltage drop between the base b and the emitter e) 0.6V, the voltage at the connection point B is stabilized at about 8.5V, the voltage of the voltage output port VCC is maintained at about 8.5V, and the output voltage of the power supply circuit is maintained at about 8.5V.

[0047] The voltage regulator circuit stabilizes and reduces the voltage of the circuit. The voltage reaching the power output port through the voltage regulator circuit branch is a stable voltage. The voltage at the power output port will not fluctuate greatly due to the large voltage change at the power input port, and a stable voltage can be output. At the same time, the voltage source can provide input voltage in a wider range, which can improve the selection range of the input voltage of the power circuit and meet the industry ISO 7637-2-2004 experimental pulse 5a and ISO16750-2 load dump (pulse P5a) ​​test requirements.

[0048] Table 1 shows the ISO 7637-2—2004 test pulse 5a test standard:

[0049]

[0050] (Table 1)

[0051] Table 2 shows the ISO16750-2 load dump (pulse P5a) ​​test standard:

[0052]

[0053] (Table 2)

[0054] Table 3 shows the test results of pulse 5a according to some embodiments of the present disclosure. The test results of Table 3 are obtained by inputting corresponding parameters in accordance with the standard requirements of Table 1 and / or Table 2 above and on the test software. Among them, Us is the input voltage of the voltage source POWER; Tr is the rise time of the input voltage of the voltage source POWER from 0V to 80V; Ri is the source impedance; Td is the pulse width; T1 is the pulse interval. Figure 3 The experimental curves obtained based on the input parameters in Table 3 are shown.

[0055] It is easy for a person skilled in the art to understand that the test result is OK, indicating that the technical solution of the present application meets the test requirements of ISO 7637-2—2004 experimental pulse 5a and ISO16750-2 load dump (pulse P5a).

[0056]

[0057] (Table 3)

[0058] It should be noted that the present invention does not limit the specific resistance values ​​of the first resistor R1 and the second resistor R2. The first resistor R1 is used for current limiting protection, and the resistance value can be appropriately large, so that the power is relatively large, which can effectively protect the subsequent components and effectively reduce power consumption. The second resistor R2 is mainly used for voltage clamping. The resistance value of the second resistor R2 can consider the conditions for the second transistor Q2 to be turned on, and also the power consumption that the second transistor Q2 can withstand. In practical applications, it can be comprehensively considered.

[0059] The filter detection circuit can play a filtering role, reduce noise interference, and detect the voltage at the input end of the voltage source POWER to ensure the normal operation of the circuit. Figure 2 As shown, the filter detection circuit 10 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a third resistor R3, a fourth resistor R4 and a detection chip interface T. The first capacitor C1 and the second capacitor C2 are connected in series, one end of the first capacitor C1 is connected between the voltage source POWER and the protection diode D1, the other end of the first capacitor C1 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded. The first capacitor C1 and the second capacitor C2 form a protection branch circuit. The third resistor R3 and the fourth resistor R4 are connected in series, one end of the third resistor R3 is connected between the voltage source POWER and the protection diode D1, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded. The third resistor R3 and the fourth resistor R4 are connected in series to form a voltage divider branch circuit. The detection chip interface T is connected between the third resistor R3 and the fourth resistor R4. The detection chip interface T is configured to detect the voltage amplitude of the voltage source POWER. The third capacitor C3 is connected in parallel with the fourth resistor R4, and one end of the third capacitor C3 is connected to the detection chip interface T. The third capacitor C3 plays a filtering role, which can filter out interference signals and improve the accuracy of the detection signal of the detection chip interface T. The branch circuit formed by the first capacitor C1 and the second capacitor C2 is connected in parallel with the branch circuit formed by the third resistor R3 and the fourth resistor R4. The first capacitor C1 and the second capacitor C2 are connected in series to form a filter circuit, which plays a filtering role, and can avoid the normal operation of the circuit being affected by abnormal input voltage.

[0060] In some embodiments, the filter circuit may include a plurality of fourth capacitors connected in parallel, one end of the plurality of fourth capacitors connected in parallel is connected between the voltage stabilization circuit and the voltage output port, and the other end is grounded. Figure 2 As shown, for example, the filter circuit 30 includes three fourth capacitors connected in parallel, namely C4-1, C4-2, and C4-3. One end of the fourth capacitors C4-1, C4-2, and C4-3 connected in parallel is connected between the voltage stabilizing circuit 20 and the voltage output port VCC, and the other end is grounded. The parallel connection of multiple fourth capacitors in the filter circuit mainly plays a filtering role, which can reduce noise interference and prevent voltage fluctuations from affecting the normal operation of the circuit. It should be noted that the number of the fourth capacitors is not limited to this and can be flexibly set according to actual needs.

[0061] In some embodiments, the power supply circuit 100 may be used for a radar, and the radar may be an ultrasonic radar.

[0062] The invention also provides an ultrasonic radar. Figure 4FIG. 2 shows a schematic diagram of an ultrasonic radar 200 according to some embodiments of the present invention. Figure 4 As shown, the ultrasonic radar 200 includes a transmitter 210, a receiver 220, a processor 230, and a power supply circuit 100. The transmitter 210 is configured to transmit an ultrasonic wave u. The receiver 220 is configured to receive an echo e reflected by the ultrasonic wave u from the object OB. The processor is coupled to the receiver 220 and configured to determine object information based on the echo e, and the object information may be, for example, the distance and speed of the object. The power supply circuit 100 is configured to output a stable voltage to provide power to at least one of the transmitter 210, the receiver 220, and the processor 230.

[0063] In some embodiments, the processor may include a processing circuit, a central processing unit (CPU), and may also include other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. Other general-purpose processors may be, for example, microcontrollers (MCU).

[0064] The present invention also provides a vehicle. Figure 5 A schematic diagram of a vehicle 300 according to some embodiments of the present invention is shown. Figure 5 As shown, the vehicle 300 includes the ultrasonic radar 200 described above, and the ultrasonic radar 200 includes the power supply circuit 100 described above.

[0065] In some embodiments, the vehicle may include a device equipped with an ultrasonic radar, such as a car, an autonomous vehicle, a truck, a van, an electric car, a bus, a train, a high-speed train, a motorcycle, a golf cart, an off-road vehicle, an agricultural vehicle, an engineering vehicle, or any other vehicle (e.g., a robot, a logistics vehicle, an unmanned delivery vehicle, a suitcase, a cart, a boat, an airplane, a helicopter, a drone, a lawn mower, a submarine, amusement park equipment or vehicle, warehouse equipment or vehicle, production equipment, etc.).

[0066] In some embodiments, the ultrasonic radar can be installed in the front, rear, side, etc. of the vehicle. If installed on the front and rear bumpers of the car, it can be used as a reversing radar. If installed on the side of the vehicle, it can be used to measure side obstacles. By adopting the above power supply circuit, the accuracy of the measurement results can be improved, and the safety of the vehicle can be improved.

[0067] The power supply circuit of the present invention can realize a wide range of voltage input and a stable voltage output through a voltage stabilizing circuit. When the voltage source provides a wide range of input voltage, the voltage output port can maintain a stable voltage output, and the output voltage will not fluctuate greatly due to the wide range and large fluctuation of the input voltage. Therefore, the selection range of the input voltage can be relatively large, and a wide range of input voltage requirements can be met. The entire power supply circuit system can work stably and reliably, meeting the testing and working requirements of the power supply circuit.

[0068] The power supply circuit of the present invention can achieve stable voltage output through the synergistic effect of the protection diode, the filter detection circuit, the voltage stabilizing circuit and the filter circuit, is applicable to a wider input voltage range, reduces the difficulty and cost of matching various electronic components, is applicable to vehicle-mounted ultrasonic radar, meets the requirements of ISO 7637-2—2004 experimental pulse 5a and ISO16750-2 load dump (pulse P5a) ​​experiment, and meets popular needs.

[0069] The ultrasonic radar of the present invention, by adopting the above power supply circuit, is applicable to a wider input voltage range and can achieve stable voltage output, which is beneficial to improving the effectiveness and reliability of the detection results.

[0070] The vehicle of the present invention, by adopting the above-mentioned ultrasonic radar, is applicable to a wider input voltage range, can achieve stable voltage output, can improve the accuracy of measurement results, can improve the safety of vehicle use, and enhance the driving experience.

[0071] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power supply circuit for a radar, wherein the radar includes an ultrasonic radar, and the power supply circuit includes: a protection diode having its input terminal connected to a voltage source; A filter detection circuit, one end of which is connected between the voltage source and the protection diode, and the other end of which is grounded, wherein the filter detection circuit is configured to filter the voltage of the voltage source and detect the voltage amplitude of the voltage source; a voltage stabilizing circuit connected between the output end of the protection diode and the voltage output port of the power supply circuit and configured to output a stable voltage; and a filter circuit, one end of which is connected between the voltage output port and the voltage stabilizing circuit, and the other end of which is grounded, and is configured to filter the voltage output by the voltage stabilizing circuit; Wherein, the voltage stabilizing circuit includes a first resistor, a voltage stabilizing diode, a first transistor, a second transistor and a second resistor, the emitter of the first transistor is connected to the output end of the protection diode; the first resistor and the voltage stabilizing diode are connected in series, one end of the first resistor is connected to the output end of the protection diode and the emitter of the first transistor, and the other end of the first resistor is connected to the cathode of the voltage stabilizing diode; the anode of the voltage stabilizing diode is grounded; the base of the first transistor is connected to the collector of the second transistor; the base of the second transistor is connected between the first resistor and the voltage stabilizing diode; the emitter of the second transistor is connected to the second resistor and is grounded through the second resistor; the collector of the first transistor is connected between the emitter of the second transistor and the second resistor; the collector of the first transistor is connected to the voltage output port. 2 . The power supply circuit according to claim 1 , wherein the first transistor comprises a PNP transistor; and the second transistor comprises an NPN transistor.

3. The power supply circuit according to claim 1 or 2, wherein the filtering detection circuit comprises a first capacitor, a second capacitor, a third capacitor, a third resistor, a fourth resistor and a detection chip interface; wherein the first capacitor and the second capacitor are connected in series, one end of the first capacitor is connected between the voltage source and the protection diode, the other end of the first capacitor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; the detection chip interface is configured to detect the voltage amplitude of the voltage source.

4. The power supply circuit according to claim 3, wherein the third resistor and the fourth resistor are connected in series, one end of the third resistor is connected between the voltage source and the protection diode, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded. 5 . The power supply circuit according to claim 3 , wherein the third resistor and the fourth resistor are connected in series, and the detection chip interface is connected between the third resistor and the fourth resistor.

6. The power supply circuit according to claim 3, wherein the third capacitor is connected in parallel with the fourth resistor, one end of the third capacitor is connected to the detection chip interface, and a branch circuit formed by the first capacitor and the second capacitor is connected in parallel with a branch circuit formed by the third resistor and the fourth resistor.

7. The power supply circuit according to claim 1 or 2, wherein the filtering circuit comprises a plurality of fourth capacitors connected in parallel, one end of the plurality of fourth capacitors connected in parallel is connected between the voltage stabilizing circuit and the voltage output port, and the other end is grounded.

8. An ultrasonic radar, comprising: a transmitter configured to transmit ultrasonic waves; A receiver configured to receive an echo of the ultrasonic wave reflected by an object; a processor, coupled to the receiver, configured to determine object information based on the echo; and The power supply circuit according to any one of claims 1 to 7, configured to output a regulated voltage to provide power to at least one of the transmitter, the receiver and the processor.

9. A vehicle comprising the ultrasonic radar according to claim 8.

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