Power management circuit of millimeter wave radar

Abstract

The utility model relates to the technical field of millimeter-wave radars, and discloses a power management circuit of a millimeter-wave radar, which comprises a filter circuit; a switching voltage stabilizing circuit; a linear voltage stabilizing circuit; a protection circuit; a power supply regulation and control circuit; the filter circuit, the switching voltage stabilizing circuit and the linear voltage stabilizing circuit are connected in sequence, and the filter circuit, the switching voltage stabilizing circuit, the linear voltage stabilizing circuit and the protection circuit are electrically connected with the power supply regulation and control circuit. According to the utility model, through the design of the filter circuit, unwanted frequencies in signals can be filtered out, the signal-to-noise ratio of the radar is improved, and the purposes of eliminating noise and enhancing the signals are achieved; through the design of the switching voltage stabilizing circuit, the stability of output voltage can be ensured, the influence of voltage fluctuation on the performance of the millimeter wave radar can be reduced, through the design of the linear voltage stabilizing circuit, the circuit structure can be optimized, a filter network can be added, the circuit noise can be reduced, normal work can be realized under the condition of small input and output voltage difference, and the power supply utilization rate can be improved.

Description

Technical Field

[0001] This utility model relates to the field of millimeter-wave radar technology, and more particularly to the field of power management for millimeter-wave radar, specifically a power management circuit for millimeter-wave radar. Background Technology

[0002] Millimeter-wave radar is a radar sensor that operates in the millimeter-wave frequency band. It transmits millimeter-wave signals through an antenna; these signals are reflected when they encounter a target, and the radar receives the reflected signals. Good power management ensures that the radar system receives a stable and reliable power supply under various operating conditions, thus guaranteeing its normal operation.

[0003] A search revealed that patent application number CN202322263588.7 discloses a power management system for an automotive millimeter-wave radar device, comprising: a step-down module, the input of which is connected to the vehicle's power supply terminal, and the output voltage of the step-down module being 3.3V; a voltage conversion module, the output of which is connected to the input of the step-down module, and the voltage conversion module having three output terminals: a first output terminal, a second output terminal, and a third output terminal, with the first output terminal having an output voltage of 5V, the second output terminal having an output voltage of 1.8V, and the third output terminal having an output voltage of 1.25V; and a voltage regulator module, the third output terminal of which is connected to the input of the voltage regulator module, and the output voltage of the voltage regulator module being 1V. This utility model's power management system for an automotive millimeter-wave radar device has a simple structure, low implementation cost, and high reliability, and can meet user needs.

[0004] Current power management circuits for millimeter-wave radar have poor step-down conversion performance, resulting in high output voltage and low power conversion efficiency. Furthermore, large voltage fluctuations significantly impact the performance of millimeter-wave radar. Millimeter-wave radar is also susceptible to interference from external environmental factors and irrelevant signals during operation, which reduces the radar's signal-to-noise ratio. Therefore, we need to propose a power management circuit for millimeter-wave radar. Utility Model Content

[0005] The purpose of this invention is to provide a power management circuit for millimeter-wave radar. Through the design of a filter circuit, unwanted frequencies in the signal can be filtered out, improving the signal-to-noise ratio of the radar and achieving the purpose of noise elimination and signal enhancement. Through the design of a switching regulator circuit, the output voltage can be stabilized, reducing the impact of voltage fluctuations on the performance of millimeter-wave radar. Through the design of a linear regulator circuit, the circuit structure can be optimized, a filter network can be added, circuit noise can be reduced, and normal operation can be achieved when the input and output voltage difference is small, thereby improving power utilization and solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a power management circuit for millimeter-wave radar, comprising:

[0007] A filter circuit used to remove ripple from the rectified output voltage;

[0008] A switching regulator circuit that can convert high input voltage to low input voltage;

[0009] A linear voltage regulator circuit that maintains a small voltage difference between the input and output voltages and provides a low-noise power supply voltage;

[0010] Protection circuit for protecting the power supply of millimeter-wave radar;

[0011] Power regulation circuit used for automatically adjusting power supply voltage and current;

[0012] The filter circuit, switching voltage regulator circuit, and linear voltage regulator circuit are connected in sequence, and the filter circuit, switching voltage regulator circuit, linear voltage regulator circuit, and protection circuit are all electrically connected to the power supply regulation circuit.

[0013] Preferably, the filtering circuit includes amplifier U10, amplifier U20, terminal block J1, terminal block J2, and terminal block J3. Resistors R4 and R5 are connected in series between pin 1 of amplifier U10 and pin 5 of amplifier U20. Capacitor C1 is connected between pin 3 of amplifier U10 and pin 1 of terminal block J1. Capacitor C5 is connected between pin 7 of amplifier U20 and pin 1 of terminal block J2. Pin 4 of amplifier U10 is connected to terminal block J3.

[0014] Preferably, the switching regulator circuit includes a chip U1. A resistor R16 is connected between pins 2 and 6 of the chip U1. A capacitor C36, a capacitor C16, a capacitor C26, and a diode D16 are connected in parallel to pin 2 of the chip U1. A resistor R26 and a capacitor C56 are connected between pins 5 and 3 of the chip U1. An inductor L1, a resistor R46, and a resistor R36 are connected between pins 3 and 8 of the chip U1. A resistor R56 is connected to the terminals of resistors R46 and R36. A capacitor C96 is connected in parallel to resistor R46.

[0015] Preferably, the linear voltage regulator circuit includes chip U11 and chip U21. An inductor L17 is connected between pin 2 of chip U11 and pin 3 of chip U21. A capacitor C17 and a capacitor C37 are connected in parallel between pin 1 and pin 3 of chip U11. A diode D17 is connected between pin 2 and pin 3 of chip U11. A capacitor C27 and a capacitor C47 are connected in parallel between pin 1 and pin 3 of chip U21. A capacitor C67 and a capacitor C57 are connected in parallel on pin 4 of chip U21.

[0016] Preferably, the protection circuit includes chip U12, chip U4, common mode inductor L38, and terminal block P2. Pin 7 of chip U12 is connected to pin 1 of chip U4, pin 5 of chip U12 is connected to pin 4 of chip U4, and a resistor R68 is connected between pin 6 of chip U4 and pin 4 of common mode inductor L38, and between pin 7 of chip U4 and pin 1 of common mode inductor L38. Resistors R58 and R78 are connected to the two ends of resistor R68, respectively.

[0017] A circuit breaker F4 is connected between pin 3 of the common mode inductor L38 and pin 1 of the terminal block P2. A circuit breaker F5 is connected between pin 2 of the common mode inductor L38 and pin 2 of the terminal block P2. A diode D68 is connected between pin 2 and pin 3 of the common mode inductor L38.

[0018] Preferably, the power regulation circuit includes a chip U3, a capacitor C18 is connected to pin 2 of the chip U3, a resistor R48 and a capacitor C48 are connected between pins 3 and 5 of the chip U3, an inductor L18, a resistor R18, and a resistor R38 are connected between pins 3 and 8 of the chip U3, and a grounded capacitor C28 is connected to the terminals of the inductor L18 and the resistor R18, and a grounded resistor R28 is connected to the terminals of the resistor R18 and the resistor R38.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This utility model, through the design of a filter circuit, can filter out unwanted frequencies in the signal, improve the signal-to-noise ratio of the radar, and achieve the purpose of eliminating noise and enhancing the signal;

[0021] 2. This utility model, through the design of a switching voltage regulator circuit, can ensure the stability of the output voltage and reduce the impact of voltage fluctuations on the performance of millimeter-wave radar;

[0022] 3. This utility model, through the design of a linear voltage regulator circuit, can optimize the circuit structure, increase the filter network, reduce circuit noise, and operate normally when the input and output voltage difference is small, thereby improving power supply utilization. Attached Figure Description

[0023] Figure 1 This is a system block diagram of the present invention;

[0024] Figure 2 This is a circuit diagram of the filter circuit of this utility model;

[0025] Figure 3 This is a circuit diagram of the switching voltage regulator circuit of this utility model;

[0026] Figure 4This is a circuit diagram of the linear voltage regulator circuit of this utility model;

[0027] Figure 5 This is a circuit diagram of the protection circuit of this utility model;

[0028] Figure 6 This is a circuit diagram of the power regulation circuit of this utility model. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-6 This utility model provides a technical solution: a power management circuit for millimeter-wave radar, comprising:

[0031] A filter circuit used to remove ripple from the rectified output voltage;

[0032] The filtering circuit includes amplifier U10, amplifier U20, terminal block J1, terminal block J2, and terminal block J3. Resistors R4 and R5 are connected in series between pin 1 of amplifier U10 and pin 5 of amplifier U20. Capacitor C1 is connected between pin 3 of amplifier U10 and pin 1 of terminal block J1. Capacitor C5 is connected between pin 7 of amplifier U20 and pin 1 of terminal block J2. Pin 4 of amplifier U10 is connected to terminal block J3.

[0033] Capacitors C1 and C5 are input coupling capacitors, used to block DC and pass AC, preventing DC signals from entering the amplifier. Resistor R1 is the input resistor, used to set the input impedance. Resistors R2 and R3 are both feedback resistors, forming a feedback network that determines the amplification factor. Capacitors C2, C3, C4, C6, and C7 are power supply filter capacitors, used to filter out high-frequency noise in the power supply. Resistors R4 and R5 are both feedback resistors, forming a feedback network that determines the amplification factor. Resistor R6 is the output resistor, used to set the input impedance.

[0034] A switching regulator circuit that can convert high input voltage to low input voltage; the switching regulator circuit selected is a BUCK type switching regulator circuit.

[0035] The switching regulator circuit includes a chip U1. A resistor R16 is connected between pins 2 and 6 of the chip U1. A capacitor C36, a capacitor C16, a capacitor C26, and a diode D16 are connected in parallel to pin 2 of the chip U1. A resistor R26 and a capacitor C56 are connected between pins 5 and 3 of the chip U1. An inductor L1, a resistor R46, and a resistor R36 are connected between pins 3 and 8 of the chip U1. A resistor R56 is connected to the terminals of resistors R46 and R36. A capacitor C96 is connected in parallel to resistor R46.

[0036] Diode D16 is a transient voltage suppression diode at the input terminal, used to protect the circuit from voltage spikes. Capacitors C26, C16, and C36 are input filter capacitors used to filter out high-frequency noise in the input power supply. R16 is a feedback resistor used to set the chip's startup threshold.

[0037] For the pin functions of chip U1: IN (pin 2): Input power supply pin, connected to +12V power supply; EN / SYNC (pin 6): Enable / synchronization pin, used to control the chip's power-on and synchronization functions; VCC (pin 7): Chip power supply pin, filtered by capacitor C46; AAM (pin 1): Automatic mode pin, used to control the chip's operating mode; BST (pin 5): Boost diode pin, used to drive the switching transistor; SW (pin 3): Switch node pin, connected to inductor L1; FB (pin 8): Feedback pin, used for voltage feedback control; GND (pin 4): Ground pin.

[0038] Inductor L1 is used for energy storage and filtering. Capacitors C66 and C76 are output filter capacitors used to filter out high-frequency noise in the output voltage. Resistors R36, R46, and R56 form a feedback resistor network used to set the output voltage. Capacitor C96 is a compensation capacitor used to stabilize the feedback loop.

[0039] A linear regulator circuit that maintains a small voltage difference between the input and output voltages and provides a low-noise power supply voltage; a low-dropout linear regulator (LDO) is selected as the linear regulator circuit.

[0040] The linear voltage regulator circuit includes chip U11 and chip U21. An inductor L17 is connected between pin 2 of chip U11 and pin 3 of chip U21. A capacitor C17 and a capacitor C37 are connected in parallel between pin 1 and pin 3 of chip U11. A diode D17 is connected between pin 2 and pin 3 of chip U11. A capacitor C27 and a capacitor C47 are connected in parallel between pin 1 and pin 3 of chip U21. A capacitor C67 and a capacitor C57 are connected in parallel on pin 4 of chip U21.

[0041] The IN pin of chip U11 is the input voltage terminal; the ON / OFF pin of chip U11 is the enable terminal, used to control the switching state of the chip; the FB pin of chip U11 is the feedback terminal, used to adjust the output voltage.

[0042] Inductor L17 is used to smooth the output voltage; diode D17 is used to prevent reverse current flow; capacitors C17, C27, C37, C47, C57, and C67 are used for filtering and stabilizing the voltage; resistor R17 is used to limit the current; and LED1 is used to indicate the circuit's operating status.

[0043] The input voltage is filtered by capacitors C17 and C37 before entering the input terminal of the LM2596S-5.0. The LM2596S-5.0 converts the input voltage into a 5V output voltage. The 5V voltage is further smoothed and filtered by inductor L17 and diode D17. The 5V voltage is further converted into a 3.3V output voltage by AMS1117-3.3. The 3.3V voltage is then filtered by capacitors C67 and C57 before being output.

[0044] Protection circuit for protecting the power supply of millimeter-wave radar;

[0045] The protection circuit includes chip U12, chip U4, common mode inductor L38, and terminal block P2. Pin 7 of chip U12 is connected to pin 1 of chip U4, pin 5 of chip U12 is connected to pin 4 of chip U4, and a resistor R68 is connected between pin 6 of chip U4 and pin 4 of common mode inductor L38, and between pin 7 of chip U4 and pin 1 of common mode inductor L38. Resistors R58 and R78 are connected to the two ends of resistor R68 respectively.

[0046] Chip U12 is a digital isolator chip used to isolate the RS485 signal from the main circuit, providing electrical isolation and preventing noise and interference. Chip U4 is an RS485 transceiver chip used to convert TTL level to RS485 level to realize data transmission and reception. Capacitor C28 is used for filtering and stabilizing the power supply voltage. Resistors R58, R68, and R78 are used to set the operating mode and matching impedance of the RS485 transceiver.

[0047] A circuit breaker F4 is connected between pin 3 of the common mode inductor L38 and pin 1 of the terminal block P2. A circuit breaker F5 is connected between pin 2 of the common mode inductor L38 and pin 2 of the terminal block P2. A diode D68 is connected between pin 2 and pin 3 of the common mode inductor L38.

[0048] Inductor L38 is used for filtering and suppressing electromagnetic interference, and diode D6 is used to prevent reverse current.

[0049] Power regulation circuit used for automatically adjusting power supply voltage and current;

[0050] The power regulation circuit includes a chip U3. A capacitor C18 is connected to pin 2 of the chip U3. A resistor R48 and a capacitor C48 are connected between pins 3 and 5 of the chip U3. An inductor L18, a resistor R18, and a resistor R38 are connected between pins 3 and 8 of the chip U3. The terminals of the inductor L18 and the resistor R18 are connected to a grounded capacitor C28. The terminals of the resistor R18 and the resistor R38 are connected to a grounded resistor R28.

[0051] Chip U3 is responsible for controlling the operation of the entire circuit, converting the input voltage into a stable output voltage. VIN: Input voltage terminal, filtered by capacitor C18 (22μF) to provide a stable input voltage; BST pin of chip U3: Used to drive the boost converter of the switching transistor, filtered and stabilized by resistor R48 (22Ω) and capacitor C48 (0.1μF); SW pin of chip U3: Switching node, connected to inductor L18 (10μH) for switching operation; EN / SYNC pin of chip U3: Enable / synchronization terminal, filtered by capacitor C38 (0.1μF) to control the chip's enable and synchronization functions; FB: Feedback terminal, provided by voltage division using resistors R18 (41.2kΩ) and R28 (13kΩ) to provide a feedback signal for adjusting the output voltage.

[0052] Inductor L18 is used for energy storage and filtering, converting the input voltage into the output voltage; capacitor C28 is the output capacitor, used for filtering and stabilizing the output voltage; resistor R38 is the feedback resistor, used to regulate the output voltage.

[0053] The filter circuit, switching voltage regulator circuit, and linear voltage regulator circuit are connected in sequence, and the filter circuit, switching voltage regulator circuit, linear voltage regulator circuit, and protection circuit are all electrically connected to the power supply regulation circuit.

[0054] In summary, the filtering circuit can filter out interference from various environmental factors and irrelevant signals during the operation of the radar system, improve the signal-to-noise ratio of the radar system, separate and extract the reflected signals of multiple targets, so that the information of each target can be displayed and processed separately, adapt the signal bandwidth to different application requirements, and improve the sensitivity and resolution of the system.

[0055] The switching regulator circuit can adjust the output voltage, has high conversion efficiency, can ensure the stability of the output voltage, reduce the impact of voltage fluctuations on the performance of millimeter-wave radar, and control the average value of the output voltage by adjusting the duty cycle of the switch, which is highly flexible.

[0056] Linear voltage regulator circuits provide stable, low-noise power supply voltages to power sensitive circuits such as radio frequency low-noise amplifiers (LNAs) in millimeter-wave radars. By optimizing the circuit structure and adding filtering networks, circuit noise is reduced, meeting the power supply requirements of sensitive circuits such as LNAs. It can still operate normally when the input-output voltage difference is small, improving power utilization efficiency and facilitating integration into the integrated circuits of millimeter-wave radars, thus reducing circuit size and complexity.

[0057] When the output voltage exceeds the safe value, the protection circuit triggers a protection signal to cut off the power supply or reduce the voltage to prevent circuit damage. When a short circuit occurs due to load changes, it limits the current to prevent excessive current from damaging the circuit. The protection circuit can respond quickly to abnormal situations and take timely measures to protect the circuit safety.

[0058] The power regulation circuit provides high-precision, high-efficiency power conversion and voltage regulation functions to meet the power performance requirements of millimeter-wave radar.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power management circuit for a millimeter wave radar, characterized by, include: A filter circuit used to remove ripple from the rectified output voltage; A switching regulator circuit that can convert high input voltage to low input voltage; A linear voltage regulator circuit that maintains a small voltage difference between the input and output voltages and provides a low-noise power supply voltage; Protection circuit for protecting the power supply of millimeter-wave radar; Power regulation circuit used for automatically adjusting power supply voltage and current; The filter circuit, switching voltage regulator circuit, and linear voltage regulator circuit are connected in sequence, and the filter circuit, switching voltage regulator circuit, linear voltage regulator circuit, and protection circuit are all electrically connected to the power supply regulation circuit.

2. The power management circuit for a millimeter wave radar according to claim 1, wherein: The filtering circuit includes amplifier U10, amplifier U20, terminal block J1, terminal block J2, and terminal block J3. Resistors R4 and R5 are connected in series between pin 1 of amplifier U10 and pin 5 of amplifier U20. Capacitor C1 is connected between pin 3 of amplifier U10 and pin 1 of terminal block J1. Capacitor C5 is connected between pin 7 of amplifier U20 and pin 1 of terminal block J2. Pin 4 of amplifier U10 is connected to terminal block J3.

3. The power management circuit for a millimeter wave radar of claim 1, wherein: The switching regulator circuit includes a chip U1. A resistor R16 is connected between pins 2 and 6 of the chip U1. A capacitor C36, a capacitor C16, a capacitor C26, and a diode D16 are connected in parallel to pin 2 of the chip U1. A resistor R26 and a capacitor C56 are connected between pins 5 and 3 of the chip U1. An inductor L1, a resistor R46, and a resistor R36 are connected between pins 3 and 8 of the chip U1. A resistor R56 is connected to the terminals of resistors R46 and R36. A capacitor C96 is connected in parallel to resistor R46.

4. The power management circuit for a millimeter wave radar of claim 1, wherein: The linear voltage regulator circuit includes chip U11 and chip U21. An inductor L17 is connected between pin 2 of chip U11 and pin 3 of chip U21. A capacitor C17 and a capacitor C37 are connected in parallel between pin 1 and pin 3 of chip U11. A diode D17 is connected between pin 2 and pin 3 of chip U11. A capacitor C27 and a capacitor C47 are connected in parallel between pin 1 and pin 3 of chip U21. A capacitor C67 and a capacitor C57 are connected in parallel on pin 4 of chip U21.

5. The power management circuit for a millimeter wave radar of claim 1, wherein: The protection circuit includes chip U12, chip U4, common mode inductor L38, and terminal block P2. Pin 7 of chip U12 is connected to pin 1 of chip U4, pin 5 of chip U12 is connected to pin 4 of chip U4, and a resistor R68 is connected between pin 6 of chip U4 and pin 4 of common mode inductor L38, and between pin 7 of chip U4 and pin 1 of common mode inductor L38. Resistors R58 and R78 are connected to the two ends of resistor R68 respectively. A circuit breaker F4 is connected between pin 3 of the common mode inductor L38 and pin 1 of the terminal block P2. A circuit breaker F5 is connected between pin 2 of the common mode inductor L38 and pin 2 of the terminal block P2. A diode D68 is connected between pin 2 and pin 3 of the common mode inductor L38.

6. The power management circuit for a millimeter wave radar of claim 1, wherein: The power regulating circuit comprises a chip U3, a capacitor C18 is connected to the 2-pin of the chip U3, a resistor R48 and a capacitor C48 are connected between the 3-pin and the 5-pin of the chip U3, an inductor L18, a resistor R18 and a resistor R38 are connected between the 3-pin and the 8-pin of the chip U3, and the connection end of the inductor L18 and the resistor R18 is connected with a grounded capacitor C28, and the connection end of the resistor R18 and the resistor R38 is connected with a grounded resistor R28.

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