Ultrasonic radar communication circuit and ultrasonic radar communication system

Abstract

The utility model provides an ultrasonic radar communication circuit and an ultrasonic radar communication system, the ultrasonic radar communication circuit comprises a control chip, a power supply module, a switch module and a radar communication module, the control chip controls the on-off of the switch module based on different working modes, and the radar communication module is connected with the control chip according to the on-off of the switch module. And controlling whether the power supply module supplies power to the radar communication module. In the ultrasonic radar communication circuit, a radar communication module at least comprises a communication chip and a filtering unit, and the filtering unit is arranged at the signal end of the communication chip, so that the quality of an output signal DSI3 is improved, a large number of burrs and harmonic waves in the signal are filtered out, and the possibility of crosstalk between a real vehicle and other wire harnesses is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply control, in particular to an ultrasonic radar communication circuit and an ultrasonic radar communication system. Background Art

[0002] Currently, automobile intelligence is becoming more and more advanced, and various assisted driving are indispensable for smart cars. Ultrasonic radar is a commonly used module in assisted driving. Its main functions are parking, lateral driving assistance, etc. The detection principle is to emit ultrasonic waves, detect echoes, and measure distance through time difference.

[0003] There are many mature ultrasonic radar modules on the market. Figure 1 , Figure 1 This is a schematic diagram of the mainstream ultrasonic radar system framework of the ZCU (region controller) architecture in the existing technology. The functional architecture based on the communication chip in FAW PDC can also be referred to Figure 1 The MCU (micro control unit) 11 interacts with the ultrasonic radar communication module 13 through the SPI protocol. The ZCU1.0 sends a voltage drive signal to the ultrasonic radar communication module 13 and returns a current signal. The high-side output of the ZCU1.0 supplies power to the ultrasonic radar communication module 13. At the same time, the ground end of the ultrasonic radar component 20 is connected to the ground of the vehicle body nearby.

[0004] Figure 1 The hardware circuit corresponding to the ultrasonic radar system framework shown has been applied in multiple batch production projects. However, when ZCU1.0 enters sleep mode, the power module 12 continues to supply power to the ultrasonic radar communication module 13, increasing the static power consumption of the circuit and the system. Furthermore, in EMI testing (Electromagnetic Interference Test, electromagnetic compatibility test or electromagnetic interference test), ultrasonic radar signals often crosstalk with other signals, resulting in a certain frequency band exceeding the standard, BCI (Bulk Current Injection) test failure, and crosstalk between radar, wiring harness and controller. These problems have always been more difficult in radar hardware design. Utility Model Content

[0005] The purpose of the present utility model is to provide an ultrasonic radar communication circuit and an ultrasonic radar communication system to solve at least one of the problems of traditional ultrasonic radar communication circuits and systems, such as high static power consumption, crosstalk coupling between ultrasonic radar signals and other signals resulting in exceeding the standard in a certain frequency band or even failure of BCI tests.

[0006] In order to solve the above technical problems, the utility model provides an ultrasonic radar communication circuit, comprising: a control chip, a power module, a switch module and a radar communication module;

[0007] The power supply end of the power supply module is connected to the first input end of the switch module, and the output end of the switch module is connected to the first input end of the radar communication module; the power supply module supplies power to the radar communication module through the switch module;

[0008] The first output terminal of the control chip is connected to the second input terminal of the switch module; based on different working modes, the control chip controls the on and off of the switch module;

[0009] The second output terminal of the control chip is connected to the second input terminal of the radar communication module; based on the synchronous serial communication protocol, the control chip and the radar communication module perform data transmission;

[0010] The radar communication module at least includes: a communication chip and a filtering unit, and the filtering unit is connected to the signal end of the communication chip.

[0011] Optionally, in the ultrasonic radar communication circuit, the filtering unit is a CRC structure.

[0012] Optionally, in the ultrasonic radar communication circuit, the filtering unit includes: a first capacitor, a second capacitor, a first resistor, a second resistor, a third capacitor and a fourth capacitor, the first resistor is connected to the first signal end of the communication chip, one end of the first capacitor is connected to one end of the first resistor, the other end of the first capacitor is grounded, the other end of the first resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded; the second resistor is connected to the second signal end of the communication chip, one end of the second capacitor is connected to one end of the second resistor, the other end of the second capacitor is grounded, the other end of the second resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded.

[0013] Optionally, in the ultrasonic radar communication circuit, the switch module includes: a transistor, a PMOS tube, a first voltage regulator tube, a fifth capacitor, a sixth capacitor, a third resistor, a fourth resistor, a second voltage regulator tube and a third voltage regulator tube, wherein,

[0014] The fifth capacitor, the third resistor and the first voltage regulator tube are connected in parallel, one end of the fifth capacitor is respectively connected to the power supply end of the power supply module and the source of the PMOS tube, the other end of the fifth capacitor is respectively connected to one end of the fourth resistor and the gate of the PMOS tube, the other end of the fourth resistor is connected to the collector of the transistor, the base of the transistor is connected to the first output end of the control chip, the emitter of the transistor is connected to the ground end, the drain of the PMOS tube is respectively connected to one end of the sixth capacitor and the first input end of the radar communication module, the other end of the sixth capacitor is connected to the ground end, the second voltage regulator tube and the third voltage regulator tube are connected in reverse series, the anode of the second voltage regulator tube is connected to the source of the PMOS tube, and the anode of the third voltage regulator tube is connected to the gate of the PMOS tube.

[0015] Optionally, in the ultrasonic radar communication circuit, the operating modes include: normal mode and sleep mode; wherein,

[0016] In the normal mode, the control chip outputs a high-level control signal to the switch module to control the switch module to be turned on, and the power supply module supplies power to the radar communication module;

[0017] In the sleep mode, the control chip outputs a low-level control signal to the switch module to control the switch module to be turned off, and the power supply from the power supply module to the radar communication module is cut off through the switch module.

[0018] Optionally, in the ultrasonic radar communication circuit, the synchronous serial communication protocol is the SPI protocol.

[0019] Optionally, in the ultrasonic radar communication circuit, the control chip is a SOC chip or an MCU chip.

[0020] Based on the same inventive concept, the present application also provides an ultrasonic radar communication system, including: multiple groups of ultrasonic radars and the ultrasonic radar communication circuit, the ultrasonic radar and the ultrasonic radar communication circuit share a common ground, and the radar communication module of the ultrasonic radar communication circuit is connected to the ultrasonic radar.

[0021] The technical solution of this application has at least the following advantages:

[0022] First, in the ultrasonic radar communication circuit of the present application, the radar communication module includes at least: a communication chip and a filtering unit. The present application improves the quality of the output signal DSI3 by setting a filtering unit at the signal end of the communication chip, filters out a large number of burrs and harmonics in the signal, and reduces the possibility of crosstalk between the actual vehicle and other wiring harnesses;

[0023] Second, the ultrasonic radar communication circuit provided by this application can control the on / off of the switch module based on different operating modes, and control whether the power module supplies power to the radar communication module according to the on / off of the switch module. This application introduces a switch module with a soft start function, which can shut down the power supply of the radar communication module when the ultrasonic radar communication circuit enters the sleep mode, thereby reducing the static power consumption of the entire circuit;

[0024] Third, the soft-start function of the switch module of the present application can prevent a large capacitive load in the subsequent stage from pulling down the high level provided by the power supply at the moment of startup, thereby causing undervoltage in other integrated circuits sharing the power supply and even causing the control chip to reset.

[0025] Fourth, in the ultrasonic radar communication system provided by this application, the ultrasonic radar and the ultrasonic radar communication circuit share a common ground, which avoids the situation in which the ultrasonic radar signal is crosstalked with other signals during EMI testing, resulting in a certain frequency band exceeding the standard and the BCI test failing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the mainstream ultrasonic radar system framework of the ZCU architecture in the existing technology;

[0027] Figure 2 This is a schematic structural diagram of an ultrasonic radar communication circuit according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the circuit structure of the switch module of an embodiment of the present utility model;

[0029] Figure 4 1 is a schematic diagram of the circuit structure of the radar communication module of an embodiment of the present utility model;

[0030] Figure 5 It is a structural diagram of an ultrasonic radar communication system according to an embodiment of the present utility model;

[0031] The description of the accompanying drawings is as follows:

[0032] 10-ZCU, 11-MCU, 12-power module, 13-ultrasonic radar communication module, 20-ultrasonic radar assembly;

[0033] 30-control chip, 40-power module, 50-switch module, 60-radar communication module, 61-filter unit, 62-communication chip, 70-ultrasonic radar. DETAILED DESCRIPTION

[0034] The ultrasonic radar communication circuit and ultrasonic radar communication system proposed in the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer based on the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structures shown in the drawings are often part of the actual structure. In particular, each drawing needs to show different focuses, and sometimes different proportions are used.

[0035] The utility model provides an ultrasonic radar communication circuit, referring to Figure 2 , Figure 2 3 is a schematic structural diagram of an ultrasonic radar communication circuit according to an embodiment of the present invention. The ultrasonic radar communication circuit includes: a control chip 30 , a power module 40 , a switch module 50 and a radar communication module 60 .

[0036] Among them, the power supply end of the power supply module 40 is connected to the first input end of the switch module 50, and the output end of the switch module 50 is connected to the first input end of the radar communication module 60; through the switch module 50, the power supply module 40 supplies power to the radar communication module 60.

[0037] The first output terminal of the control chip 30 is connected to the second input terminal of the switch module 40 ; based on different working modes, the control chip 30 controls the on and off of the switch module 40 .

[0038] The second output terminal of the control chip 30 is connected to the second input terminal of the radar communication module 60 ; based on a synchronous serial communication protocol, the control chip 30 and the radar communication module 60 perform data transmission.

[0039] Better, reference Figure 4 , Figure 4 Schematic diagram of the circuit structure of the radar communication module of the embodiment of the present invention. The radar communication module 60 at least includes: a communication chip 62 and a filter unit 61. The filter unit 61 is connected to the signal end of the communication chip 62.

[0040] In this embodiment, the power supply voltage VCC of the communication chip 62 is 5V.

[0041] Preferably, the filtering unit 61 is a CRC structure. Specifically, the filtering unit 61 includes: a first capacitor C4, a second capacitor C5, a first resistor R10, a second resistor R11, a third capacitor C6, and a fourth capacitor C7. The first resistor R10 is connected to the first signal terminal DSI1 of the communication chip 62, one end of the first capacitor C4 is connected to one end of the first resistor R10, and the other end of the first capacitor C4 is grounded. The other end of the first resistor R10 is connected to one end of the third capacitor C6, and the other end of the third capacitor C6 is grounded. The second resistor R11 is connected to the second signal terminal DSI2 of the communication chip 62, one end of the second capacitor C5 is connected to one end of the second resistor R11, and the other end of the second capacitor C5 is grounded. The other end of the second resistor R11 is connected to one end of the fourth capacitor C7, and the other end of the fourth capacitor C7 is grounded.

[0042] In this embodiment, the third capacitor C6 and the fourth capacitor C7 are 4.7 nf common-mode capacitors to ground.

[0043] In this application, a filter unit 61 is provided at the signal end of the communication chip 62 to improve the quality of the output signal DSI3, filter out a large number of glitches and harmonics in the signal, and reduce the possibility of crosstalk between the actual vehicle and other wiring harnesses. In this embodiment, the synchronous serial communication protocol is the SPI protocol.

[0044] Furthermore, the control chip 30 can be a SOC chip or MCU chip conventionally used in vehicle-mounted radar communication. This application does not limit the specific model of the control chip 30. It only requires that the control chip 30 can output a high-level control signal or a low-level control signal MCU_VBAT_RADAR_SWITCH to the switch module 50 according to different working modes.

[0045] refer to Figure 3 , Figure 3: This is a schematic diagram of the circuit structure of the switch module of an embodiment of the present utility model. The switch module 50 includes: a transistor T1300, a PMOS tube M1, a first voltage regulator tube D1, a fifth capacitor C1, a sixth capacitor C2, a third resistor R1, a fourth resistor R2, a second voltage regulator tube D2 and a third voltage regulator tube D3, wherein the fifth capacitor C1, the third resistor R1 and the first voltage regulator tube D1 are connected in parallel, one end of the fifth capacitor C1 is respectively connected to the power supply end of the power module 40 and the source of the PMOS tube M1, the other end of the fifth capacitor C1 is respectively connected to one end of the fourth resistor R2 and the gate of the PMOS tube M1, the fifth capacitor C1 is respectively connected to the power supply end of the power module 40 and the source of the PMOS tube M1, ... fifth capacitor C1 is respectively connected to the power supply end of the power module 40 and the source of the PMOS tube M1, the fifth capacitor C1 is respectively connected to the power supply end of the power module 40 and the source of the PMOS tube M1, the fifth capacitor C1 is respectively connected to the power supply end of The other end of the four resistors R2 is connected to the collector of the transistor T1300, the base of the transistor T1300 is connected to the first output end of the control chip 30, the emitter of the transistor T1300 is connected to the ground end, the drain of the PMOS transistor M1 is respectively connected to one end of the sixth capacitor C2 and the first input end (pin 6 / VBAT) of the radar communication module 60, the other end of the sixth capacitor C2 is connected to the ground end, the second voltage regulator transistor D2 and the third voltage regulator transistor D3 are connected in reverse series, the anode of the second voltage regulator transistor D2 is connected to the source of the PMOS transistor M1, and the anode of the third voltage regulator transistor D3 is connected to the gate of the PMOS transistor M1.

[0046] Among them, due to the circuit structure of the above-mentioned switch module 40, the switch module 40 has a soft start function, which can prevent the high level provided by the power module 40 from being pulled down by the subsequent capacitive load due to the large subsequent capacitive load at the moment of startup, thereby causing undervoltage in other integrated circuits sharing the power module 40 and even causing the control chip to reset.

[0047] In this embodiment, the operating modes of the ultrasonic radar communication circuit include: normal mode and sleep mode.

[0048] Specifically, in normal mode, the control chip 30 outputs a high-level control signal (MCU_VBAT_RADAR_SWITCH=1) to the switch module 50, the transistor T1300 is turned on, the high-level VBAT_D provided by the power module 40 is divided by the third resistor R1 and the fourth resistor R2, the voltage across the gate and source of the PMOS tube M1 is greater than the conduction voltage drop, the PMOS tube M1 is turned on, and the level signal VBAT_RADAR is output to the subsequent radar communication module 60, that is, the switch module 50 is turned on, and the power module 40 supplies power to the radar communication module 60 (level signal VBAT_RADAR).

[0049] Furthermore, in sleep mode, the control chip outputs a low-level control signal (MCU_VBAT_RADAR_SWITCH=0) to the switch module, the transistor T1300 is turned off, the PMOS tube M1 is turned off, and thus the switch module 50 is turned off. Through the switch module 50, the power supply from the power supply module 40 to the radar communication module 60 is cut off, the radar communication module 60 does not work, and the static power consumption of the ultrasonic radar communication circuit is reduced.

[0050] In this application, the ultrasonic radar communication circuit can control the on and off of the switch module based on different working modes, and control whether the power module supplies power to the radar communication module according to the on and off of the switch module. This application introduces a switch module with a soft start function, which can cut off the power supply of the radar communication module when the ultrasonic radar communication circuit enters the sleep mode, thereby reducing the static power consumption of the overall circuit.

[0051] Based on the same inventive concept, the present application also provides an ultrasonic radar communication system, including: multiple groups of ultrasonic radars 70 and the ultrasonic radar communication circuit, the ultrasonic radar 70 and the ultrasonic radar communication circuit share a common ground, and the radar communication module 60 of the ultrasonic radar communication circuit is connected to the ultrasonic radar 70.

[0052] Among them, the communication chip 62 integrates a communication unit, a control unit and a power supply unit, etc. Pins 7 and pins 9 of the communication chip 62 are used to communicate with the external ultrasonic radar 70. From right to left on the communication line are the filter unit 61, the unidirectional TVS (D4, D5) and the bidirectional TVS (D6-D9); the communication between the communication chip 62 and the control chip 30 is completed through pins 1-4; the operation of the ultrasonic radar 70 is controlled through pins 14-18; the others are radar power supply pins.

[0053] In normal mode, the control chip 30 outputs a high-level control signal (MCU_VBAT_RADAR_SWITCH = 1) to the switch module 50, turning on transistor T1300 and PMOS transistor M1, which then outputs a level signal VBAT_RADAR to the downstream radar communication module 60. This turns on the switch module 50, and the power module 40 supplies power to the radar communication module 60 (level signal VBAT_RADAR). The radar communication module 60 sends a voltage drive signal to the ultrasonic radar 70, which in turn returns a ternary current signal. The radar communication module 60 and the control chip 30 interact via the SPI protocol. The external ultrasonic radar 70 is powered by the high-side output of the ultrasonic radar communication circuit, and the ultrasonic radar 70 and the ultrasonic radar communication circuit share a common ground.

[0054] In the ultrasonic radar communication system provided in the present application, the control chip can control the on and off of the switch module based on different working modes, and control whether the power supply module supplies power to the radar communication module according to the on and off of the switch module. When the ultrasonic radar communication circuit enters the sleep mode, the power supply of the radar communication module and the ultrasonic radar can be turned off, thereby reducing the static power consumption of the ultrasonic radar communication system; furthermore, the ultrasonic radar and the ultrasonic radar communication circuit share a common ground, which avoids the situation in which the ultrasonic radar signal is crosstalked with other signals during the EMI test, resulting in exceeding the standard in a certain frequency band and failure of the BCI test.

[0055] The above description is only a description of the preferred embodiment of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An ultrasonic radar communication circuit, characterized in that: Including: control chip, power module, switch module and radar communication module; The power supply end of the power supply module is connected to the first input end of the switch module, and the output end of the switch module is connected to the first input end of the radar communication module; the power supply module supplies power to the radar communication module through the switch module; The first output terminal of the control chip is connected to the second input terminal of the switch module; based on different working modes, the control chip controls the on and off of the switch module; The second output terminal of the control chip is connected to the second input terminal of the radar communication module; Based on the synchronous serial communication protocol, the control chip and the radar communication module perform data transmission; The radar communication module at least includes: a communication chip and a filtering unit, and the filtering unit is connected to the signal end of the communication chip.

2. The ultrasonic radar communication circuit according to claim 1, characterized in that: The filtering unit is a CRC structure.

3. The ultrasonic radar communication circuit according to claim 2, characterized in that: The filtering unit includes: a first capacitor, a second capacitor, a first resistor, a second resistor, a third capacitor and a fourth capacitor, the first resistor is connected to the first signal end of the communication chip, one end of the first capacitor is connected to one end of the first resistor, the other end of the first capacitor is grounded, the other end of the first resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded; the second resistor is connected to the second signal end of the communication chip, one end of the second capacitor is connected to one end of the second resistor, the other end of the second capacitor is grounded, the other end of the second resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded.

4. The ultrasonic radar communication circuit according to claim 1, characterized in that: The switch module includes: a transistor, a PMOS tube, a first voltage regulator tube, a fifth capacitor, a sixth capacitor, a third resistor, a fourth resistor, a second voltage regulator tube and a third voltage regulator tube, wherein: The fifth capacitor, the third resistor and the first voltage regulator tube are connected in parallel, one end of the fifth capacitor is respectively connected to the power supply end of the power supply module and the source of the PMOS tube, the other end of the fifth capacitor is respectively connected to one end of the fourth resistor and the gate of the PMOS tube, the other end of the fourth resistor is connected to the collector of the transistor, the base of the transistor is connected to the first output end of the control chip, the emitter of the transistor is connected to the ground end, the drain of the PMOS tube is respectively connected to one end of the sixth capacitor and the first input end of the radar communication module, the other end of the sixth capacitor is connected to the ground end, the second voltage regulator tube and the third voltage regulator tube are connected in reverse series, the anode of the second voltage regulator tube is connected to the source of the PMOS tube, and the anode of the third voltage regulator tube is connected to the gate of the PMOS tube.

5. The ultrasonic radar communication circuit according to claim 1, wherein: The working modes include: normal mode and sleep mode; wherein, In the normal mode, the control chip outputs a high-level control signal to the switch module to control the switch module to be turned on, and the power supply module supplies power to the radar communication module; In the sleep mode, the control chip outputs a low-level control signal to the switch module to control the switch module to be turned off, and the power supply from the power supply module to the radar communication module is cut off through the switch module.

6. The ultrasonic radar communication circuit according to claim 1, characterized in that: The synchronous serial communication protocol is the SPI protocol.

7. The ultrasonic radar communication circuit according to claim 1, characterized in that: The control chip is a SOC chip or an MCU chip.

8. An ultrasonic radar communication system, characterized in that: include: Multiple groups of ultrasonic radars and the ultrasonic radar communication circuit according to any one of claims 1 to 7, the ultrasonic radars and the ultrasonic radar communication circuit share a common ground, and the radar communication module of the ultrasonic radar communication circuit is connected to the ultrasonic radar.

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