Passive braking circuit and smart mobile device

Abstract

The utility model provides a kind of passive brake circuit and intelligent mobile device, it is related to motor drive control field, the circuit includes: energy storage module and brake module, brake module includes: main control unit, drive control unit and switch unit;Energy storage module is respectively connected with the first phase line, second phase line and third phase line of motor to be braked, and it generates and stores electric energy when passive rotation of motor to be braked;Main control unit is electrically connected with energy storage module, for sending brake control signal to drive control unit;Drive control unit is electrically connected with main control unit, for sending drive signal to switch unit based on brake control signal;Switch unit is respectively connected with the first phase line, second phase line and third phase line of motor to be braked, for making at least two of first phase line, second phase line and third phase line short-circuit based on drive signal.The application has realized the kinetic energy recovery and safety braking after motor to be braked power off, and has promoted brake reliability and security.

Description

Technical Field

[0001] This application relates to the field of motor drive control, and more specifically, to a passive braking circuit and an intelligent mobile device. Background Technology

[0002] With the development of intelligent technology, smart mobile devices are being used more and more widely in daily life and work. These devices often need to operate or move on uneven terrain, and their operation relies on battery-powered motors to achieve walking function. When the battery is powered normally, stable driving and braking can be achieved through motor control; however, when the battery is de-energized, the device poses a safety hazard on slopes. Therefore, how to achieve motor braking in the absence of external power supply has become an urgent technical problem to be solved. Utility Model Content

[0003] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a passive braking circuit and a smart mobile device. This utility model provides the following technical solution: In a first aspect, this application provides a passive braking circuit for braking a motor under passive conditions. The circuit includes an energy storage module and a braking module. The braking module includes a main control unit, a drive control unit, and a switching unit. The energy storage module is electrically connected to the first phase line, the second phase line and the third phase line of the motor to be braked, respectively, so as to generate and store electrical energy when the motor to be braked is passively rotating. The main control unit is electrically connected to the energy storage module and operates based on the electrical energy stored in the energy storage module. The main control unit is used to send braking control signals to the drive control unit. The drive control unit is electrically connected to the main control unit and is used to send a drive signal to the switching unit based on the braking control signal. The switching unit is electrically connected to the first phase line, the second phase line, and the third phase line of the motor to be braked, respectively, and is used to short-circuit at least two of the first phase line, the second phase line, and the third phase line based on the drive signal.

[0004] In one embodiment, the circuit further includes a braking detection module, which is electrically connected to the motor to be braked and the main control unit, respectively, and is used to convert the rotation of the shaft of the motor to be braked into a braking signal and transmit it to the main control unit; the main control unit is also used to generate the braking control signal based on the braking signal.

[0005] In one embodiment, the braking detection module includes an emergency stop button.

[0006] In one embodiment, the circuit further includes: a voltage conversion module electrically connected to the motor to be braked; the voltage conversion module is used to acquire the back electromotive force of the motor to be braked, convert the back electromotive force into a target voltage, and store it in the energy storage module.

[0007] In one embodiment, the voltage conversion module includes a voltage conversion chip, which is electrically connected to the energy storage module.

[0008] In one embodiment, the switching unit includes a three-phase bridge arm, which includes a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a fifth switch transistor, and a sixth switch transistor. The control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are respectively electrically connected to the drive control unit to receive the drive signal; The input terminals of the first switch, the second switch, and the third switch are electrically connected to the output terminal of the energy storage module, respectively. The output terminals of the fourth switch, the fifth switch, and the sixth switch are respectively grounded; The output terminal of the first switch is electrically connected to the first phase line and the input terminal of the fourth switch, respectively. The output terminal of the second switch is electrically connected to the second phase line and the input terminal of the fifth switch, respectively; The output terminal of the third switch is electrically connected to the third phase line and the input terminal of the sixth switch, respectively.

[0009] In one embodiment, the main control unit includes: a main control chip and a NAND gate logic processing chip; The input terminal of the main control chip is electrically connected to the output terminal of the energy storage module; The output terminal of the main control chip is electrically connected to the first input terminal of the NAND gate logic processing chip; The first input terminal of the NAND gate logic processing chip is also electrically connected to the output terminal of the energy storage module. The output of the NAND gate logic processing chip is electrically connected to the drive control unit.

[0010] In one embodiment, the main control unit further includes a seventh switch, the control terminal of which is electrically connected to the brake switch, the input terminal of which is electrically connected to the output terminal of the energy storage module and the second input terminal of the NAND gate logic processing chip, and the output terminal of which is grounded.

[0011] In one embodiment, the drive control unit includes a decoding chip and a drive chip. The input terminal of the decoding chip is electrically connected to the output terminal of the NAND gate logic processing chip, and the output terminal of the decoding chip is electrically connected to the input terminal of the drive chip. The output terminal of the drive chip is electrically connected to the control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch, respectively.

[0012] Secondly, this application provides an intelligent mobile device, including: a motor to be braked and the passive braking circuit described in the first aspect.

[0013] This application provides a passive braking circuit and an intelligent mobile device. The circuit includes an energy storage module and a braking module. The braking module includes a main control unit, a drive control unit, and a switching unit. The energy storage module is electrically connected to the first, second, and third phase lines of the motor to be braked, respectively, to generate and store electrical energy when the motor rotates passively. The main control unit is electrically connected to the energy storage module and operates based on the electrical energy stored in the energy storage module. The main control unit is used to send a braking control signal to the drive control unit. The drive control unit is electrically connected to the main control unit and is used to send a drive signal to the switching unit based on the braking control signal. The switching unit is electrically connected to the first, second, and third phase lines of the motor to be braked, respectively, and is used to short-circuit at least two of the first, second, and third phase lines based on the drive signal. This application realizes kinetic energy recovery and safe braking after the motor to be braked is de-energized, improving braking reliability and safety.

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the passive braking circuit provided in an embodiment of this application is shown; Figure 2 This paper shows another structural schematic diagram of the passive braking circuit provided in an embodiment of this application; Figure 3 This illustration shows another structural schematic diagram of the passive braking circuit provided in an embodiment of this application; Figure 4 A circuit diagram of the switching unit provided in an embodiment of this application is shown; Figure 5 A circuit diagram of the main control chip provided in an embodiment of this application is shown; Figure 6 A circuit diagram of the NAND gate logic processing chip provided in an embodiment of this application is shown; Figure 7 A circuit diagram of the decoding chip provided in an embodiment of this application is shown; Figure 8 A schematic diagram of the structure of a smart mobile device provided in an embodiment of this application is shown.

[0017] Explanation of key component symbols: 100-Passive braking circuit; 110-Energy storage module; 120-Braking module; 121-Main control unit; 122-Drive control unit; 123-Switch unit; 130-Braking detection module; 140-Voltage conversion module; 200-Motor to be braked; 800-Intelligent mobile device. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Example 1 With the widespread use of smart mobile devices, such as snowplows, automatic lawnmowers, and security patrol vehicles, there is a safety hazard of sliding down uneven surfaces, such as slopes, when these devices are operating or moving. To achieve intelligent braking after a power outage, please refer to [link to relevant documentation]. Figure 1 This application provides a passive braking circuit 100, including an energy storage module 110 and a braking module 120. The braking module 120 includes a main control unit 121, a drive control unit 122, and a switching unit 123. The energy storage module 110 is electrically connected to the first phase line, the second phase line, and the third phase line of the motor 200 to be braked, respectively, to generate and store electrical energy when the motor 200 is passively rotating. The main control unit is electrically connected to the energy storage module 110 and operates based on the electrical energy stored in the energy storage module 110. The main control unit is used to send a braking control signal to the drive control unit 122. The drive control unit is electrically connected to the main control unit and is used to send a drive signal to the switching unit 123 based on the braking control signal. The switching unit is electrically connected to the first phase line, the second phase line, and the third phase line of the motor 200 to be braked, respectively, and is used to short-circuit at least two of the first phase line, the second phase line, and the third phase line based on the drive signal.

[0022] In this embodiment, on uneven ground, such as a ramp, when the trolley equipped with the braking motor loses power or its battery is depleted, it will slide down the ramp under the influence of gravity. To avoid accidents, the trolley needs to be braked to allow it to slide down at a slow speed. Specifically, the electrical energy generated during the first phase of sliding down activates the braking system to perform the braking action, during which the trolley's speed decreases. After the electrical energy generated during the first phase of sliding down is consumed, the electrical energy generated during the second phase of sliding down is used to reactivate the braking system to perform the braking action. By cyclically performing the braking action, the trolley slides down the ramp at a low speed.

[0023] Specifically, the energy storage module 110 is connected to the three phase lines of the motor 200 to be braked. When the motor 200 is in a passive rotation state, it generates electrical energy through electromagnetic induction. The energy storage module 110 acquires and stores this electrical energy. The main control unit 121 is electrically connected to the energy storage module 110 and uses the electrical energy stored in the energy storage module 110 as its working power source. It can operate without external power supply and generates and sends a braking control signal to the drive control unit 122. After receiving the braking control signal, the drive control unit 122 converts it into a drive signal that can be recognized by the switch unit 123 and outputs it. The switch unit 123 is also connected to the three phase lines of the motor. After receiving the drive signal, it will trigger an action to short-circuit at least two of the three phase lines of the motor. Then, the electromagnetic damping force generated by the short circuit of the motor windings will be used to resist the rotation of the rotor, and finally the passive braking of the motor 200 to be braked will be achieved.

[0024] If the motor to be braked slides down when the power is off, the main control unit 121 will determine whether to issue a braking control signal based on the signals from the brake button and the main control unit 121. Specifically, the logic is active low; if any input is low, the output signal will be high.

[0025] In one implementation, please refer to Figure 2 The passive braking circuit 100 further includes a braking detection module 130, which is electrically connected to the motor to be braked 200 and the main control unit 121, respectively, and is used to convert the rotation of the shaft of the motor to be braked 200 into a braking signal and transmit it to the main control unit 121; the main control unit 121 is also used to generate the braking control signal based on the braking signal.

[0026] In this embodiment, the brake detection module 130 monitors the rotation state of the motor shaft in real time and converts the monitored rotation into a brake signal that meets the recognition standard of the main control unit 121 through a signal conversion mechanism. The brake signal is then transmitted to the main control unit 121. In addition to its original functions, the main control unit 121 also determines whether the motor needs to brake based on the received brake signal, and then accurately generates the corresponding brake control signal to provide accurate instructions for the subsequent drive control unit 122 and switch unit 123 to trigger the braking action.

[0027] In one embodiment, the braking detection module 130 includes an emergency stop button.

[0028] In one implementation, please refer to Figure 3 The passive braking circuit 100 further includes a voltage conversion module 140, which is electrically connected to the energy storage module 110 of the motor 200 to be braked. The voltage conversion module 140 is used to acquire the back electromotive force of the motor 200 to be braked, convert the back electromotive force into a target voltage, and store it in the energy storage module 110.

[0029] In this embodiment, when the motor to be braked reverses downwards, the back electromotive force generated by the rotor of the motor to be braked cutting the magnetic field is acquired by the voltage conversion module. Then, through rectification, voltage stabilization and other processing, the unstable back electromotive force is converted into a target voltage that meets the working requirements of each module and stored in the energy storage module 110. The energy storage module 110 supplies power to the main control unit 121, the switching unit 123 and the drive control unit 122.

[0030] It is understandable that energy recovery can be achieved by utilizing the back electromotive force generated during the reversal of the motor to be braked. This eliminates the need for external power supply to ensure the continuous operation of the passive braking circuit and enable braking of the motor to be braked. This not only improves energy utilization efficiency but also ensures the stable execution of the braking logic in the event of a power outage, thus avoiding braking failure due to power interruption.

[0031] When the vehicle rolls off the ramp, the rotor of the brake motor 200 reverses direction with the wheel, cutting the magnetic field and generating a back electromotive force (EMF). The voltage conversion module 140 acquires this back EMF, rectifies and regulates it to convert it into the target voltage, and stores it in the energy storage module 110. The energy storage module 110 then supplies power to the brake detection module 130, the main control unit 121, the drive control unit 122, and the switching unit 123. The brake detection module 130 monitors the motor shaft reversal in real time and converts this state into a brake signal, which is transmitted to the main control unit 121. The main control unit 121 generates a brake control signal based on this signal and sends it to the drive control unit 122. The drive control unit 122 further outputs a drive signal to trigger the switching unit 123. At least two phase wires of the motor 200 to be braked are short-circuited, and electromagnetic damping force is used to impede the rotation of the motor, thereby reducing the speed of the trolley. When the trolley decelerates due to the damping force and the motor speed decreases, resulting in a weakening of the back electromotive force, the energy storage module 110 releases the stored electrical energy to maintain the continuous operation of each unit. At the same time, the motor 200 to be braked will continue to rotate as the trolley slowly slides down and generate new back electromotive force. After being converted by the voltage conversion module 140, it is replenished to the energy storage module 110, forming a cycle of trolley reversal to generate electricity - energy storage to supply electricity - triggering braking deceleration - continuous rotation to generate electricity again. Through this cycle, the back electromotive force is continuously used to supply energy and apply braking damping, ultimately enabling the trolley to slowly and smoothly descend from the slope in a passive state, avoiding the safety hazards caused by rapid trolley sliding.

[0032] In one embodiment, the voltage conversion module 140 includes a voltage conversion chip, which is electrically connected to the energy storage module 110.

[0033] In this embodiment, the voltage conversion chip is electrically connected to the energy storage module 110 to acquire the back electromotive force generated when the motor 200 to be braked reverses. Through internal rectification and voltage regulation circuits, the unstable back electromotive force is converted into a target voltage that meets the storage requirements of the energy storage module 110 and the subsequent working requirements of each control unit. The converted stable voltage is then transmitted to the energy storage module 110 for storage, providing continuous power support for the braking-generating-braking cycle and ensuring that the passive braking circuit 100 can still operate stably when there is no external power supply.

[0034] In one embodiment, the switching unit 123 includes a three-phase bridge arm, which includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch. The control terminals of the first, second, third, fourth, fifth, and sixth switches are electrically connected to the drive control unit 122. The input terminals of the first, second, and third switches are electrically connected to the output terminal of the energy storage module. The output terminals of the fourth, fifth, and sixth switches are grounded. The output terminal of the first switch is electrically connected to the first phase line and the input terminal of the fourth switch, respectively; the output terminal of the second switch is electrically connected to the second phase line and the input terminal of the fifth switch, respectively; the output terminal of the third switch is electrically connected to the third phase line and the input terminal of the sixth switch, respectively.

[0035] In this embodiment, the switching unit 123 includes a three-phase bridge arm composed of a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a fifth switching transistor, and a sixth switching transistor. The control terminals of each switching transistor are electrically connected to the drive control unit 122 to receive drive signals and turn on or off according to the drive signals. The input terminals of the first, second, and third switching transistors are all connected to the output terminal of the voltage conversion module 140 to obtain the operating voltage from the voltage conversion module; the output terminals of the fourth, fifth, and sixth switching transistors are grounded. Simultaneously, the output terminal of the first switching transistor is connected to the input terminal of the fourth switching transistor, the output terminal of the second switching transistor is connected to the input terminal of the fifth switching transistor, and the output terminal of the third switching transistor is connected to the input terminal of the sixth switching transistor, forming three sets of upper and lower bridge arm structures. The three-phase bridge arm, through the on / off control of each switching transistor by the drive control unit 122, can realize the circuit switching of the three-phase lines of the motor to be braked, providing a hardware foundation for subsequent braking via phase line short circuit.

[0036] Please combine Figure 4 , Figure 4 A circuit diagram of a switching unit 123 provided in an embodiment of this application is shown. In the diagram, Q6 represents the first switching transistor, Q7 represents the second switching transistor, Q8 represents the third switching transistor, Q9 represents the fourth switching transistor, Q10 represents the fifth switching transistor, and Q11 represents the sixth switching transistor. Figure 4 In the diagram, BLDC_LA, BLDC_LB, and BLDC_LC represent the first phase line, second phase line, and third phase line of the motor 200 to be braked, respectively.

[0037] In one embodiment, the main control unit 121 includes: a main control chip and a NAND gate logic processing chip; the input terminal of the main control chip is electrically connected to the output terminal of the energy storage module; the output terminal of the main control chip is electrically connected to the first input terminal of the NAND gate logic processing chip; the first input terminal of the NAND gate logic processing chip is also electrically connected to the output terminal of the voltage conversion module; and the output terminal of the NAND gate logic processing chip is electrically connected to the drive control unit 122.

[0038] In this embodiment, please refer to Figure 5 and Figure 6 , Figure 5 A circuit diagram of the main control chip provided in an embodiment of this application is shown. Figure 6 A circuit diagram of a NAND gate logic processing chip provided in an embodiment of this application is shown. Figure 5 In the diagram, U5 represents the main control chip, specifically model GD32F303CBT6; SIG_MCU_TERM represents the braking control signal output by the main control chip to the NAND gate logic processing chip; and ADC_LESC_CUR represents the braking signal obtained from the braking detection module. Figure 6 In the diagram, U19 represents the NAND gate logic processing chip, specifically model SN74LVC1GOODBVR, and SIG_LESC_BREAK represents the output signal of the NAND gate logic processing chip. Figure 5 and Figure 6 In this context, +3.3V represents the voltage obtained from the energy storage module 110.

[0039] The input terminal of the main control chip is electrically connected to the output terminal of the energy storage module 110, and is used to obtain power from the energy storage module 110 and power on. After power-on, the main control chip sends an enable signal to the first input terminal of the NAND gate logic processing chip, i.e. Figure 5 and Figure 6 The SIGN_MCU_TERM shown.

[0040] It is understood that the first input terminal of the NAND gate logic processing chip is electrically connected to the output terminal of the energy storage module 110. When obtaining power from the voltage conversion module 140, the first input terminal of the NAND gate logic processing chip is set to a high level, and when obtaining an enable signal from the main control chip, it is set to a low level.

[0041] In one embodiment, the main control unit 121 further includes a seventh switch transistor, the control terminal of which is electrically connected to the brake switch, the input terminal of which is electrically connected to the output terminal of the energy storage module and the second input terminal of the NAND gate logic processing chip, and the output terminal of which is grounded.

[0042] In this embodiment, please refer to Figure 6 , Figure 6 In the diagram, Q1 represents the seventh switch, which is a field-effect transistor. Its control terminal is electrically connected to the brake switch. In response to user operation, the brake switch sends a conduction control signal to the control terminal of the seventh switch to control the seventh switch to conduct.

[0043] The input terminal of the seventh switch is electrically connected to the output terminal of the energy storage module 110 and the second input terminal of the NAND gate logic processing chip, respectively. When the seventh switch is off, the second input terminal of the NAND gate logic processing chip obtains power from the output terminal of the voltage conversion module and is set to a high level; when the seventh switch is on, the second output terminal of the NAND gate logic processing chip is grounded and set to a low level, and its signal input is... Figure 6 In Chinese, it is represented by SIG_TERM.

[0044] It is understood that when the first or second input terminal of the NAND gate logic processing chip is at a low level, a control signal is sent to the drive control unit 122 to control the braking of the motor to be braked. That is, the passive braking circuit 100 provided in this application can not only automatically brake in response to the back electromotive force generated when the braked motor reverses, but also manually brake in response to user operation through the brake switch.

[0045] In one embodiment, the drive control unit 122 includes a decoding chip and a drive chip. The input terminal of the decoding chip is electrically connected to the output terminal of the NAND gate logic processing chip, and the output terminal of the decoding chip is electrically connected to the input terminal of the drive chip. The output terminal of the drive chip is electrically connected to the control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch, respectively.

[0046] In this embodiment, the drive control unit 122 consists of a decoding chip and a drive chip, which form a cascaded relationship for signal processing and execution: the input terminal of the decoding chip is connected to the output terminal of the NAND gate logic processing chip in the main control unit 121, and is responsible for receiving the control signal received from the NAND gate after logic verification, and decoding the signal, such as converting the serial control signal into a parallel signal that can drive the subsequent circuit, or parsing the logic instruction to control the switching transistors to turn on and off; after decoding, the decoding chip transmits the processed signal to the input terminal of the drive chip through the output terminal; the drive chip, as a power drive stage, has its output terminal connected to the control terminals of the six switching transistors (the first to the sixth switching transistors) in the switching unit 123, and can convert the low-power logic signal output by the decoding chip into a drive signal with sufficient driving capability, directly controlling the conduction and cutoff of each switching transistor, thereby realizing precise control of the three-phase bridge arm switching state and providing key drive support for the short-circuit braking of the motor phase lines.

[0047] Please see Figure 7 , Figure 7 A circuit diagram of a decoding chip provided in an embodiment of this application is shown. Figure 7 In this context, U3 represents the decoding chip, specifically the XL33035. L_LA, L_LB, and L_LC represent the signals output to the decoding chip, specifically the EG2134. Also, please refer to section 4 again. Figure 4 In this context, U4 represents the driver chip.

[0048] The passive braking circuit 100 provided in this embodiment includes an energy storage module 110 and a braking module 120. The braking module 120 includes a main control unit 121, a drive control unit 122, and a switching unit 123. The energy storage module 110 is electrically connected to the first phase line, the second phase line, and the third phase line of the motor 200 to be braked, respectively, to generate and store electrical energy when the motor 200 is passively rotating. The main control unit 121 is electrically connected to the energy storage module 110 and, based on the... The energy storage module 110 stores electrical energy for operation. The main control unit 121 sends a braking control signal to the drive control unit 122. The drive control unit 122 is electrically connected to the main control unit 121 and sends a drive signal to the switch unit 123 based on the braking control signal. The switch unit 123 is electrically connected to the first phase line, the second phase line, and the third phase line of the motor 200 to be braked, and is used to short-circuit at least two of the first phase line, the second phase line, and the third phase line based on the drive signal. This application realizes kinetic energy recovery and safe braking of the motor 200 after power failure, improving braking reliability and safety.

[0049] Example 2 In addition, please see Figure 8 This application provides a smart mobile device 500, including: a motor to be braked 200 and a passive braking circuit 100 as described in Embodiment 1, wherein the passive braking circuit 100 is electrically connected to the motor to be braked 200.

[0050] Specifically, the passive braking circuit 100 includes an energy storage module 110 and a braking module 120. The braking module 120 includes a main control unit 121, a drive control unit 122, and a switching unit 123. The energy storage module 110 is electrically connected to the first phase line, the second phase line, and the third phase line of the motor 200 to be braked, respectively, to generate and store electrical energy when the motor 200 is passively rotating. The main control unit 121 is electrically connected to the energy storage module 110 and operates based on the electrical energy stored in the energy storage module 110. The main control unit 121 is used to send a braking control signal to the drive control unit 122. The drive control unit 122 is electrically connected to the main control unit 121 and is used to send a drive signal to the switch unit 123 based on the braking control signal. The switch unit 123 is electrically connected to the first phase line, the second phase line, and the third phase line of the motor 200 to be braked, respectively, and is used to short-circuit at least two of the first phase line, the second phase line, and the third phase line based on the drive signal.

[0051] In one embodiment, the passive braking circuit 100 further includes a braking detection module 130, which is electrically connected to the motor to be braked 200 and the main control unit 121, respectively, and is used to convert the rotation of the shaft of the motor to be braked 200 into the braking signal and transmit it to the main control unit 121; the main control unit 121 is also used to generate the braking control signal based on the braking signal.

[0052] In one embodiment, the braking detection module 130 includes an emergency stop button.

[0053] In one embodiment, the passive braking circuit 100 further includes a voltage conversion module 140, which is electrically connected to the motor to be braked 200 and the energy storage module 110, respectively. The voltage conversion module 140 is used to acquire the back electromotive force of the motor 200 to be braked, convert the back electromotive force into a target voltage, and store it in the energy storage module 110.

[0054] In one embodiment, the voltage conversion module 140 includes a voltage conversion chip, which is electrically connected to the motor to be braked 200 and the energy storage module 110, respectively.

[0055] In one embodiment, the switching unit 123 includes a three-phase bridge arm, which includes a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a fifth switch transistor, and a sixth switch transistor. The control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are respectively electrically connected to the drive control unit 122 to receive the drive signal; The input terminals of the first switch, the second switch, and the third switch are electrically connected to the output terminal of the energy storage module 110, respectively. The output terminals of the fourth switch, the fifth switch, and the sixth switch are respectively grounded; The output terminal of the first switch is electrically connected to the first phase line and the input terminal of the fourth switch, respectively. The output terminal of the second switch is electrically connected to the second phase line and the input terminal of the fifth switch, respectively; The output terminal of the third switch is electrically connected to the third phase line and the input terminal of the sixth switch, respectively.

[0056] In one embodiment, the main control unit 121 includes: a main control chip and a NAND gate logic processing chip; the input terminal of the main control chip is electrically connected to the output terminal of the energy storage module 110; the output terminal of the main control chip is electrically connected to the first input terminal of the NAND gate logic processing chip; the first input terminal of the NAND gate logic processing chip is also electrically connected to the output terminal of the energy storage module 110; and the output terminal of the NAND gate logic processing chip is electrically connected to the drive control unit 122.

[0057] In one embodiment, the main control unit 121 further includes a seventh switch transistor, the control terminal of which is electrically connected to the brake switch, the input terminal of which is electrically connected to the output terminal of the energy storage module 110 and the second input terminal of the NAND gate logic processing chip, and the output terminal of which is grounded.

[0058] In one embodiment, the drive control unit 122 includes a decoding chip and a drive chip, wherein the input terminal of the decoding chip is electrically connected to the output terminal of the NAND gate logic processing chip, and the output terminal of the decoding chip is electrically connected to the input terminal of the drive chip. The output terminal of the driver chip is electrically connected to the control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch, respectively.

[0059] The intelligent mobile device 500 provided in this embodiment of the present invention can realize the function of the passive braking circuit 100 provided in the above embodiment 1. To avoid repetition, it will not be described again here.

[0060] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0061] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0062] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A passive braking circuit, characterized in that, The circuit is used to brake the motor under passive conditions. The circuit includes an energy storage module and a braking module. The braking module includes a main control unit, a drive control unit, and a switching unit. The energy storage module is electrically connected to the first phase line, the second phase line and the third phase line of the motor to be braked, respectively, so as to generate and store electrical energy when the motor to be braked is passively rotating. The main control unit is electrically connected to the energy storage module and operates based on the electrical energy stored in the energy storage module. The main control unit is used to send braking control signals to the drive control unit. The drive control unit is electrically connected to the main control unit and is used to send a drive signal to the switching unit based on the braking control signal. The switching unit is electrically connected to the first phase line, the second phase line, and the third phase line of the motor to be braked, respectively, and is used to short-circuit at least two of the first phase line, the second phase line, and the third phase line based on the drive signal.

2. The passive braking circuit according to claim 1, characterized in that, The circuit also includes a brake detection module, which is electrically connected to the motor to be braked and the main control unit, respectively, and is used to convert the rotation status of the shaft of the motor to be braked into a brake signal and transmit it to the main control unit. The main control unit is also used to generate the braking control signal based on the braking signal.

3. The passive braking circuit according to claim 2, characterized in that, The braking detection module includes an emergency stop button.

4. The passive braking circuit according to claim 3, characterized in that, The circuit further includes a voltage conversion module, which is electrically connected to the motor to be braked and the energy storage module respectively; The voltage conversion module is used to acquire the back electromotive force of the motor to be braked, convert the back electromotive force into a target voltage, and store it in the energy storage module.

5. The passive braking circuit according to claim 4, characterized in that, The voltage conversion module includes a voltage conversion chip, which is electrically connected to the motor to be braked and the energy storage module.

6. The passive braking circuit according to any one of claims 1-5, characterized in that, The switching unit includes a three-phase bridge arm, which includes a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a fifth switch transistor, and a sixth switch transistor. The control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are respectively electrically connected to the drive control unit to receive the drive signal; The input terminals of the first switch, the second switch, and the third switch are electrically connected to the output terminal of the energy storage module, respectively. The output terminals of the fourth switch, the fifth switch, and the sixth switch are respectively grounded; The output terminal of the first switch is electrically connected to the first phase line and the input terminal of the fourth switch, respectively. The output terminal of the second switch is electrically connected to the second phase line and the input terminal of the fifth switch, respectively; The output terminal of the third switch is electrically connected to the third phase line and the input terminal of the sixth switch, respectively.

7. The passive braking circuit according to claim 6, characterized in that, The main control unit includes: a main control chip and a NAND gate logic processing chip; The input terminal of the main control chip is electrically connected to the output terminal of the energy storage module; The output terminal of the main control chip is electrically connected to the first input terminal of the NAND gate logic processing chip; The first input terminal of the NAND gate logic processing chip is also electrically connected to the output terminal of the energy storage module. The output of the NAND gate logic processing chip is electrically connected to the drive control unit.

8. The passive braking circuit according to claim 7, characterized in that, The main control unit further includes a seventh switch, the control terminal of which is electrically connected to the brake switch, the input terminal of which is electrically connected to the output terminal of the energy storage module and the second input terminal of the NAND gate logic processing chip, and the output terminal of which is grounded.

9. The passive braking circuit according to claim 8, characterized in that, The drive control unit includes a decoding chip and a drive chip. The input terminal of the decoding chip is electrically connected to the output terminal of the NAND gate logic processing chip, and the output terminal of the decoding chip is electrically connected to the input terminal of the drive chip. The output terminal of the driver chip is electrically connected to the control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch, respectively.

10. A smart mobile device, characterized in that, include: The motor to be braked and the passive braking circuit according to any one of claims 1-9.

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