Boost conversion circuit for supplying power to CAN circuit and millimeter wave radar

Abstract

The utility model relates to the technical field of electronic circuits, and discloses a boost conversion circuit for supplying power to a CAN circuit and a millimeter wave radar, which comprise a DCDC converter, a power management module, a switched capacitor boost converter and a CAN transceiver. One end of the DCDC converter is connected with a battery power supply, and the other end is connected with the switched capacitor boost converter and the power management module; the power management module is connected with the switched capacitor boost converter, the power management module controls the switched capacitor boost converter to work, and the switched capacitor boost converter is used for boosting a first voltage signal output by the DCDC converter according to a working voltage value required by the CAN transceiver and then outputting a second voltage signal; the CAN transceiver is connected with the switched capacitor boost converter and the DCDC converter. According to the boost converter based on the switched capacitor, the circuit is simpler, large-scale elements such as an inductor do not need to be configured, the circuit design is simplified, and the PCB space is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field, especially a kind of boost conversion circuit and millimeter wave radar for CAN circuit power supply. BACKGROUND

[0002] Electrification, intelligentization, automation has become the significant trend of current automobile development. With the continuous improvement of electrification integration, the number of automobile electronic control unit (ECU) is also increasing. In this process, as the core protocol of automobile electronic component control, the importance of Controller Area Network (CAN) network protocol is increasingly prominent. Therefore, in the design of ECU unit, CAN circuit has become an indispensable component.

[0003] According to the SOC (System on Chip) power supply characteristics, in the power supply design, especially when providing peripheral power supply for CAN circuit, the design of power rail becomes a crucial problem. For radar products, the radar product power supply design scheme usually adopts the architecture of first-level DC-DC (Direct Curren-Direct Curren) + second-level PMIC (Power Management Chip).

[0004] Since the input power supply voltage requirement of radar processor chip (such as AM2732 chip) is 3.3V, the first-level power supply system usually selects the DCDC power supply scheme with 3.3V output. However, the power rail of CAN needs to provide 5V power input. In order to meet this demand, in the design of peripheral power supply circuit, a power supply circuit capable of boosting 3.3V voltage to 5V is needed. In the prior art, BOOST boost circuit is usually used to realize it. However, BOOST boost circuit can meet the basic boost requirement, but there are some problems in actual application. For example, the peripheral configuration of BOOST boost circuit is relatively complex, and output inductance and other elements need to be configured, which not only increases the cost of circuit, but also occupies a large PCB space. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a boost conversion circuit and millimeter wave radar for CAN circuit power supply, to solve the problems existing in the prior art.

[0006] In the first aspect, the utility model provides a boost conversion circuit for CAN circuit power supply, comprising: DCDC converter, power management module, switched capacitor boost converter and CAN transceiver.

[0007] One end of the DCDC converter is connected with a battery power supply, and the other end is connected with the switch capacitor boost converter and the power management module;

[0008] The power management module is connected with the switch capacitor boost converter, the power management module controls the switch capacitor boost converter to work, and the switch capacitor boost converter is used for boosting the first voltage signal output by the DCDC converter to a second voltage signal according to the working voltage value required by the CAN transceiver;

[0009] The CAN transceiver is connected with the switch capacitor boost converter and the DCDC converter.

[0010] According to the boost conversion circuit for the CAN circuit provided by the utility model, the VIN pin of the switch capacitor boost converter is connected with the DCDC converter;

[0011] The first node is arranged between the VIN pin and the DCDC converter, the first node is connected with a first capacitor, and the other end of the first capacitor is grounded;

[0012] The EN pin of the switch capacitor boost converter is connected with the power management module;

[0013] The C1+ and C1- pins of the switch capacitor boost converter are connected with two ends of a second capacitor;

[0014] The GND pin of the switch capacitor boost converter is grounded;

[0015] The VOUT pin of the switch capacitor boost converter is connected with a second node and outputs the second voltage signal, the second node is connected with a third capacitor, and the other end of the third capacitor is grounded.

[0016] According to the boost conversion circuit for the CAN circuit provided by the utility model, the PFM pin of the switch capacitor boost converter is connected with the VIN pin, and the switch capacitor boost converter is arranged in a pulse frequency modulation mode to run, so that the output frequency is dynamically adjusted.

[0017] According to the boost conversion circuit for the CAN circuit provided by the utility model, the OUTDIS pin of the switch capacitor boost converter is connected with the VIN pin.

[0018] According to the boost conversion circuit for the CAN circuit provided by the utility model, the types of the first capacitor, the second capacitor and the third capacitor include ceramic capacitors or film capacitors.

[0019] The capacitance value range of the first capacitor and the third capacitor is 2-10uF, and the capacitance value of the second capacitor is 1uF.

[0020] The DCDC converter is used for stabilizing the voltage output by the battery power supply to 3.3V, and the switched capacitor boost converter is used for boosting the 3.3V voltage to 5V.

[0021] The working voltage range of the switched capacitor boost converter is 3.1V-5.5V, and the output current of 200mA at most is provided in the working voltage range.

[0022] In a first aspect, the utility model provides a kind of millimeter wave radar, comprising: the boost conversion circuit of any one described above, radar processor, at least one radio frequency transceiver and communication module;

[0023] DCDC converter connects the radar processor and the communication module;

[0024] Power management module connects the at least one radio frequency transceiver.

[0025] According to the utility model provides a kind of millimeter wave radar, the power management module is used for converting the voltage signal output by DCDC converter into multi-path voltage signal, to meet the working voltage required by the at least one radio frequency transceiver.

[0026] The utility model provides a kind of boost conversion circuit and millimeter wave radar for CAN circuit power supply, it include: DCDC converter, power management module, switched capacitor boost converter and CAN transceiver;One end of DCDC converter connects battery power supply, the other end connects switched capacitor boost converter and power management module;Power management module connects switched capacitor boost converter, power management module controls switched capacitor boost converter work, switched capacitor boost converter is used for the first voltage signal output by DCDC converter is boosted according to the working voltage value required by CAN transceiver and exports second voltage signal;CAN transceiver connects switched capacitor boost converter and DCDC converter.Compared with BOOST circuit peripheral configuration complex, needs to configure output inductance component and other needs, the utility model is simpler based on the circuit of switched capacitor boost converter, greatly simplifies circuit design.Switched capacitor boost converter does not need inductor and other large components, can significantly save circuit cost.Meanwhile also greatly save PCB space, so that the whole circuit is more compact, portable, it is favorable to promote the integration and aesthetic property of product. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0028] Figure 1 A logic structure schematic diagram of a boost conversion circuit for supplying power to a CAN circuit is provided for the embodiment of the present application.

[0029] Figure 2 A circuit schematic diagram of a switched capacitor boost converter is provided for the embodiment of the present application.

[0030] Figure 3 A structure schematic diagram of a millimeter wave radar is provided for the embodiment of the present application.

[0031] Reference signs:

[0032] 1, DCDC converter; 2, power management module; 3, switched capacitor boost converter; 4, CAN transceiver; 5, radar processor; 6, video transceiver; 7, communication module. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting” should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements or the interaction between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the following description, the order words used to distinguish elements, such as “first”, “second”, “third” and “fourth”, etc. are only for the convenience of the description of the present application, and have no specific meaning and order relationship.

[0036] Refer toFigure 1 The utility model discloses an embodiment provides a kind of boost conversion circuit for CAN circuit power supply, comprising: DCDC converter 1, power management module 2, switched capacitor boost converter 3 and CAN transceiver 4;

[0037] One end of DCDC converter 1 is connected to battery power supply, and the other end is connected to switched capacitor boost converter 3 and power management module 2;

[0038] Power management module 2 connects switched capacitor boost converter 3, and power management 2 controls switched capacitor boost converter 3 work, and switched capacitor boost converter 3 is used to output second voltage signal after the first voltage signal output by DCDC converter 1 is boosted according to the operating voltage value required by CAN transceiver 4;

[0039] CAN transceiver 4 connects switched capacitor boost converter 3 and DCDC converter 1.

[0040] Specifically, DCDC converter 1 is used as the starting part of the circuit, which is responsible for converting the voltage provided by the battery power supply into a voltage suitable for subsequent circuit processing. This voltage can be one of the operating voltages required by some components in the CAN transceiver. Switched capacitor boost converter 3 receives the first voltage signal output by DCDC converter 1 and performs voltage boosting processing to output a second voltage signal according to the control signal of power management module 2. Since different components inside CAN transceiver 4 may require different operating voltages, i.e. the design of CAN power rail needs to provide different voltage inputs than the first voltage signal, CAN transceiver 4 is connected to DCDC converter 1 and switched capacitor boost converter 3 respectively to obtain two different operating voltages.

[0041] Further, switched capacitor boost converter 3 can automatically or in response to the control signal output by power management module 2 to adjust its output voltage to meet the operating requirements of different components or devices.

[0042] For example, in the case of automotive electronics, CAN circuit is used to connect various electronic control units (ECU) of the car, such as engine control, brake control, body control, etc. CAN bus technology is one of the most commonly used communication protocols in the field of automotive electronics, enabling information sharing and coordinated control between various systems within the car. At this time, the battery power supply connected by DCDC converter 1 can be a 12V or 24V car battery. With its high reliability, flexibility and real-time performance, CAN transceiver has been widely used in automotive electronics, industrial automation, medical devices, robots and security monitoring fields.

[0043] Compared with the BOOST circuit peripheral configuration, the circuit design of the switch capacitor boost converter 3 is more simple. It does not need an inductor, but only through the capacitor equipped inside to realize the boost function, which greatly simplifies the circuit design and reduces the circuit complexity. Since no large components such as inductors are used, the circuit cost can be significantly saved. At the same time, the use of small capacitors in the switch capacitor boost converter 3 also greatly saves the PCB space, making the entire circuit more compact and portable, which is conducive to improving the integration and aesthetics of the product. Therefore, the boost function of the switch capacitor boost converter enables the circuit to adapt to CAN transceivers with different working voltages, enhancing the adaptability and flexibility of the system. Whether in automotive electronics, industrial control or other fields, it can provide stable and reliable CAN circuit power supply solutions.

[0044] In this embodiment, referring to Figure 2 The device in the dashed box is a switch capacitor boost converter 3, and the VIN pin is connected to the DCDC converter 1.

[0045] A first node N1 is provided between the VIN pin and the DCDC converter, the first node N1 is connected to a first capacitor C1, and the other end of the first capacitor C1 is grounded.

[0046] The EN pin of the switch capacitor boost converter 3 is connected to the power management module 2.

[0047] The C1+ and C1- pins of the switch capacitor boost converter 3 are connected to the two ends of a second capacitor C2.

[0048] The GND pin of the switch capacitor boost converter 3 is grounded.

[0049] The VOUT pin of the switch capacitor boost converter 3 is connected to a second node N2 and outputs a second voltage signal, the second node N2 is connected to a third capacitor C3, and the other end of the third capacitor C3 is grounded.

[0050] The VIN pin is an input voltage pin and is directly connected to the battery to provide initial power to the circuit. In this embodiment, the Battery connected to the VIN pin can be a stabilized power supply output by the DCDC converter 1. The EN pin is an enable pin connected to the power management module 2, used to control the start and stop of the switch capacitor boost converter 3. The output voltage VOUT pin provides the converted stable voltage to the power receiving module in the subsequent system system.

[0051] The circuit further comprises two first capacitors C1 and third capacitors C3, the first capacitor C1 is an input end filter capacitor, because the voltage output by the DCDC converter 1 can contain some high-frequency noise or fluctuations, the input end capacitor (C1) can absorb these high-frequency components, so that the voltage input to the switched capacitor boost converter is more stable. Similarly, the voltage output by the switched capacitor boost converter 3 can generate some ripple or noise due to switching action, the output capacitor (C3) can filter out these unwanted components, so that the output voltage is smoother and more stable. While the second capacitor C2 acts as a key energy storage element, it can store and transfer charge during the switching process of the converter, thereby achieving voltage boost. When the switch of the switched capacitor boost converter 3 is in a certain state, C2 will charge and store energy; when the switching state is switched, C2 will release the stored energy to help boost the output voltage. Therefore, by adjusting the duty cycle of the switch, changing the capacitance value of the capacitor, etc., precise control of the output voltage can be achieved.

[0052] Exemplarily, the capacitance value of the first capacitor C1 and the third capacitor C3 is in the range of 2-10uF, and the capacitance value of the second capacitor C2 is 1uF. The first capacitor C1 and the third capacitor C3 are filter and voltage stabilizing capacitors, and the selection of their capacitance values needs to ensure that they can effectively filter out high-frequency noise and ripple in the circuit, while providing stable DC voltage output for the back-end load. The second capacitor C2 is affected by factors such as the power demand, dynamic frequency response and stability requirements of the back-end load. For example, in a high-frequency circuit, the second capacitor C2 needs to select a capacitor with a smaller capacitance value to reduce the influence of parasitic inductance and resistance and improve the high-frequency performance of the circuit.

[0053] Exemplarily, the types of the first capacitor C1, the second capacitor C2 and the third capacitor C3 include ceramic capacitors or thin-film capacitors. Ceramic capacitors have the characteristics of good high-frequency response and high temperature stability, while thin-film capacitors have the advantages of small size, light weight and low price. For example, the second capacitor C2 is a key energy storage capacitor in the circuit, and a ceramic capacitor with good high-frequency response and high temperature stability needs to be selected to ensure the stability of the circuit in high frequency and wide temperature range. For capacitors that play a role in filtering and voltage stabilization in the circuit, thin-film capacitors can be a suitable choice because of their low price, small size and stable quality.

[0054] In this embodiment, the PFM pin of the switched capacitor boost converter 3 is connected to the VIN pin, which is used to set the switched capacitor boost converter 3 to operate in pulse frequency modulation (PFM) mode to dynamically adjust the output frequency. In the circuit, reducing its own static current by operating in PFM mode is an important function that can be achieved by connecting the PFM pin to the high-level VIN pin. When the PFM pin is connected to the high-level VIN pin, the circuit enters PFM mode. In this mode, the circuit dynamically adjusts the output frequency according to the load condition, thereby optimizing energy efficiency. For example, in a light load or standby state, the PFM mode can significantly reduce the static current of the circuit, because the circuit does not need to run at full speed, but can reduce energy consumption by reducing the frequency. Therefore, by dynamically adjusting the output frequency, the PFM mode can ensure that the circuit operates at the optimal energy efficiency under different load conditions.

[0055] In this embodiment, the OUTDIS pin of the switched capacitor boost converter 3 is connected to the VIN pin. When the OUTDIS pin is set to high level, the output voltage will be pulled to GND (ground potential) at the moment when the switched capacitor is turned off, in order to achieve the purpose of making the rear-end load power down as soon as possible. Conversely, when the OUTDIS pin is set to low level, the switched capacitor boost converter 3 is kept in a high-impedance state, which means that the connection between the converter and the load is disconnected or greatly weakened, so that it temporarily stops supplying power to the load under certain conditions.

[0056] In this embodiment, the DCDC converter 1 is used to stabilize the voltage output by the battery power supply to 3.3V, and the switched capacitor boost converter 3 is used to boost the 3.3V voltage to 5V. In the peripheral power supply circuit of the CAN circuit, many microcontrollers and sensors work at 3.3 volts, but certain specific CAN applications may require 5 volts to drive certain peripherals or actuators, such as certain types of solenoid valves, relays, etc. In view of the fact that the CAN power rail also needs to be designed to provide a 5V power input, the 3.3V voltage is boosted to 5V to meet the compatibility, driving capability or specific application requirements of different elements. Therefore, by reasonable power supply design, the DCDC converter and the switched capacitor boost converter are used to meet the different input voltage requirements of 3.3V and 5V in the design of the CAN power rail.

[0057] In this embodiment, the operating voltage range of the switched capacitor boost converter 3 is 3.1V to 5.5V, and it provides a maximum output current of 200mA within the operating voltage range.

[0058] Exemplarily, the model of the switch capacitor voltage booster converter 3 used in the embodiment can be LM2775-Q1. This model is a voltage-stabilized switch capacitor doubler with inductorless solution, with low noise output voltage characteristics. Only 3 small ceramic capacitors need to be set internally, and it can provide an output current of up to 200mA in a working voltage range of 3.1V to 5.5V, can reduce its own static current by running in pulse frequency modulation (PFM) mode, and has current limiting and overheat protection functions to ensure that the device can safely operate in abnormal conditions. The 2MHz switching frequency has friendly electromagnetic interference (EMI) compatibility characteristics, and is widely used in millimeter wave radar, ADAS camera power supply and other products.

[0059] Referring to Figure 3 The utility model embodiment further provides a millimeter wave radar, comprising: the boost conversion circuit, the radar processor 5, at least one radio frequency transceiver 6 and the communication module 7 described in the above embodiment;

[0060] The DCDC converter 1 is connected with the radar processor 5 and the communication module 7.

[0061] The power management module 2 is connected with at least one radio frequency transceiver 6.

[0062] In the embodiment, the power management module 2 is used to convert the voltage signal output by the DCDC converter 1 into a plurality of voltage signals to meet the working voltage required by at least one radio frequency transceiver 6.

[0063] Specifically, when designing the power supply of the millimeter wave radar product, a power supply scheme of a one-stage DCDC+two-stage PMIC power supply topology structure is generally adopted. This power supply scheme is optimized based on the SOC power supply characteristics. And the SOC usually needs multiple PMICs (Power Management ICs) to manage multiple different power rails, and each power rail can provide appropriate voltage and current for different components in the system.

[0064] Exemplarily, the DCDC converter 1 can select LM62460-Q1 as a one-stage DCDC power chip. The radar processor 5 can select AM2732 chip. The CAN transceiver can select TJA1145 chip. The communication module 7 can select RTL9000BRG chip. The power management module 2 can select LP876242-Q1 chip as the power supply chip of the radio frequency transceiver 6. The radio frequency transceiver 6 can select AWR2243 chip. The power management module 2 provides voltage signals of multiple different voltage levels such as 1.2V and 1.8V to the radio frequency transceiver 6, such as providing multiple different input voltages of 1V, 1.2V, 1.8V and the like for the radio frequency transceiver 6, to ensure that the radio frequency transceiver 6 can stably transmit and receive millimeter wave signals.

[0065] The embodiment meets the 5V power supply requirement (CAN_VCC) of the CAN circuit, and considers cost and circuit differences, discards the BOOST circuit of the prior art, and selects a switch capacitor voltage converter 3 of model LM2775-Q1, with a maximum output current of 200mA, which can meet the maximum current requirement of VCC / 65mA, and compared with the peripheral configuration of the BOOST circuit, the peripheral configuration is more complex, such as the requirement of configuring an output inductor element, and has the defects of higher circuit cost and larger occupied PCB space. The radar power supply design scheme of the embodiment selects the switch capacitor voltage converter scheme of model LM2775-Q1 to replace the BOOST voltage boosting circuit, and under the condition of meeting the maximum current of CAN VCC, has lower noise output voltage, the circuit is simpler, the circuit complexity is reduced, and the product cost control is more friendly. Meanwhile, more PCB space can be saved, so that the entire circuit is more compact and light, and is beneficial to improving the integration and aesthetics of the product.

[0066] In conclusion, the boost conversion circuit and the millimeter wave radar for supplying power to the CAN circuit are proposed, compared with the BOOST circuit peripheral configuration, the circuit based on the switch capacitor voltage converter is simpler, and the circuit design is greatly simplified. The switch capacitor voltage converter does not need large elements such as inductors, and can significantly save circuit cost. Meanwhile, the PCB space is greatly saved, so that the entire circuit is more compact and light, and is beneficial to improving the integration and aesthetics of the product.

[0067] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0068] The above is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application, and any changes and modifications made in the shape, structure, features and spirit of the present application within the scope of the present application should be included in the scope of the present application.

Claims

1. A boost conversion circuit for powering a CAN circuit, characterized by The application relates to a voltage boosting circuit, and relates to a radar processor, at least one radio frequency transceiver and a communication module. The DCDC converter is connected with a battery power supply at one end and connected with the switch capacitor voltage boosting converter and the power management module at the other end. The power management module is connected with the switch capacitor voltage boosting converter, and the power management module controls the switch capacitor voltage boosting converter to work, and the switch capacitor voltage boosting converter is used for boosting a first voltage signal output by the DCDC converter to a second voltage signal according to a working voltage value required by the CAN transceiver. The CAN transceiver is connected with the switch capacitor voltage boosting converter and the DCDC converter. The VIN pin of the switch capacitor voltage boosting converter is connected with the DCDC converter.

2. The boost conversion circuit of claim 1, wherein, A first node is arranged between the VIN pin and the DCDC converter, and the first node is connected with a first capacitor, and the other end of the first capacitor is grounded. The EN pin of the switch capacitor voltage boosting converter is connected with the power management module. The C1+ and C1- pins of the switch capacitor voltage boosting converter are connected with two ends of a second capacitor. The GND pin of the switch capacitor voltage boosting converter is grounded. The VOUT pin of the switch capacitor voltage boosting converter is connected with a second node and outputs the second voltage signal, the second node is connected with a third capacitor, and the other end of the third capacitor is grounded. The PFM pin of the switch capacitor voltage boosting converter is connected with the VIN pin, and is used for setting the switch capacitor voltage boosting converter to work in a pulse frequency modulation mode to dynamically adjust an output frequency.

3. The boost conversion circuit of claim 2, wherein, The OUTDIS pin of the switch capacitor voltage boosting converter is connected with the VIN pin.

4. The boost conversion circuit of claim 2, wherein, The types of the first capacitor, the second capacitor and the third capacitor include ceramic capacitors or thin film capacitors.

5. The boost conversion circuit of claim 2, wherein, The capacitance value of the first capacitor and the third capacitor ranges from 2 to 10uF, and the capacitance value of the second capacitor is 1uF.

6. The boost conversion circuit of claim 2 or 5, wherein, The DCDC converter is used for stabilizing a voltage output by the battery power supply to 3.3V, and the switch capacitor voltage boosting converter is used for boosting the 3.3V voltage to 5V.

7. The boost conversion circuit of claim 1, wherein, The working voltage range of the switch capacitor voltage boosting converter is 3.1V to 5.5V, and the switch capacitor voltage boosting converter provides a maximum output current of 200mA in the working voltage range.

8. The boost conversion circuit of claim 1, wherein, The application relates to a voltage boosting circuit, and relates to a radar processor, at least one radio frequency transceiver and a communication module.

9. A millimeter wave radar, characterized by, The DCDC converter is connected with the radar processor and the communication module. The power management module is connected with the at least one radio frequency transceiver. The power management module is used for converting a voltage signal output by the DCDC converter into multiple voltage signals to meet a working voltage required by the at least one radio frequency transceiver. ​ 10. The millimeter wave radar of claim 9, wherein, ​

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