Brake circuit, motor and electronic equipment

Abstract

The utility model discloses a brake circuit, a motor and electronic equipment. The brake circuit comprises a first transistor, a first resistor module, a switch module and a brake resistor, the first transistor is connected with a control signal so as to respond to the control signal to be alternately switched on or switched off; the switch module is used for being switched on in response to the voltage difference of the first resistor module when the first transistor is switched on and being switched off when the first transistor is switched off; the brake resistor is used for being connected with the grounding end through the switched-on switch module and the first transistor when the switch module is switched on so as to consume the brake voltage of the voltage output end of the motor, and is used for disconnecting the electric connection with the grounding end when the switch module is switched off. The brake resistor and the grounding end are alternately electrically connected or disconnected, the brake voltage of the voltage output end of the motor is consumed intermittently, energy consumption is effectively ensured, model selection of the brake resistor is optimized, and the optimal matching of cost and performance is achieved.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a braking circuit, a motor, and an electronic device. Background Art

[0002] Electric control, namely the abbreviation of electronic control, is a technical means of using electronic technology to control various machines and devices. At present, electric control technology has been widely applied in all walks of life. For example, Programmable Logic Controller (PLC) and Distributed Control System (DCS) in the industrial field, and automobiles in the transportation field, etc.

[0003] As a key component of electric control technology, the braking resistor is also under increasing pressure. In a variable frequency speed regulation system, the speed reduction and shutdown of the motor are achieved by gradually reducing the frequency. At the moment when the frequency decreases, the synchronous speed of the motor decreases accordingly, and due to the action of mechanical inertia, the rotor speed of the motor remains unchanged. When the synchronous speed is less than the rotor speed, the phase of the rotor current changes by almost 180°, and the motor will change from the electric state to the generating state; at the same time, the torque on the motor shaft becomes a braking torque, causing the speed of the motor to drop rapidly, and the motor is in the regenerative braking state. The electric energy regenerated by the motor will be fully rectified by the freewheeling diode and fed back to the DC circuit. Since the electric energy in the DC circuit cannot be fed back to the power grid through the rectifier bridge and can only be absorbed by the capacitors of the frequency converter itself, although other parts of the circuit can also consume electric energy, there is still a short-term charge accumulation in the capacitors, forming a "pump-up voltage", which causes the DC voltage to rise, and the excessive DC voltage will damage each part of the device.

[0004] In the related art, a braking resistor is used to consume the regenerative energy of the motor in the form of heat energy. Due to the advantages of easy tight installation, easy attachment of radiators, and beautiful appearance of aluminum alloy resistors, they are currently widely used. However, the greater the power consumption of the aluminum alloy resistor, the larger its volume, resulting in difficult assembly and higher costs. Summary of the Utility Model

[0005] In view of the above problems, this application provides a braking circuit, a motor, and an electronic device to solve the above technical problems.

[0006] In a first aspect, this application provides a braking circuit, which includes a first transistor, a first resistor module, a switch module, and a braking resistor. The braking resistor is connected to the motor voltage output terminal and the switch module;

[0007] The control terminal of the first transistor is connected to a control signal and alternately conducts or disconnects in response to the control signal. The first end of the first transistor is connected to the first end of the first resistor module and the switch module, the second end of the first transistor is connected to the ground terminal, and the second end of the first resistor module is connected to the drive voltage output terminal and the switch module;

[0008] The switch module is configured to conduct in response to the voltage difference of the first resistor module when the first transistor conducts, and to disconnect when the first transistor disconnects. The voltage difference of the first resistor module is generated based on the drive voltage provided by the drive voltage output terminal;

[0009] The braking resistor is configured to connect to the ground terminal through the conducting switch module and the first transistor when the switch module conducts, so as to consume the braking voltage of the motor voltage output terminal, and to disconnect the electrical connection with the ground terminal when the switch module disconnects.

[0010] In a possible implementation manner of the present application, the braking circuit further includes a main control module, and the main control module is connected to the control terminal of the first transistor to output a control signal to the first transistor. Wherein, the control signal is a pulse width modulation signal.

[0011] In a possible implementation manner of the present application, the first resistor module includes at least one resistor, and the at least one resistor is connected in series between the drive voltage output terminal and the first end of the first transistor.

[0012] In a possible implementation manner of the present application, the braking circuit further includes a current limiting module connected to the control terminal of the first transistor, and the current limiting module is configured to limit the current flowing into the control terminal of the first transistor.

[0013] In a possible implementation manner of the present application, the current limiting module includes at least one current limiting resistor, and the at least one current limiting resistor is connected in series to the control terminal of the first transistor.

[0014] In a possible implementation manner of the present application, the switch module includes a second transistor, the control terminal of the second transistor is connected to the first end of the first transistor, the first end of the second transistor is connected to the drive voltage output terminal, and the second end of the second transistor is connected to the braking resistor.

[0015] In a possible implementation manner of the present application, the switch module further includes a resistor-capacitor filtering unit. The resistor-capacitor filtering unit includes a filtering capacitor connected in parallel between the control terminal and the first end of the second transistor, and a filtering resistor connected in series between the first end of the first transistor and the control terminal of the second transistor.

[0016] In a possible implementation manner of the present application, the braking circuit further includes a diode connected in parallel with the braking resistor, and the anode of the diode is connected to the switch module, and the cathode of the diode is connected to the motor voltage output terminal.

[0017] In a second aspect, the present application also provides a motor, which includes a motor main body and a braking circuit as described in the first aspect provided on the motor main body.

[0018] In a third aspect, the present application also provides an electronic device, which includes a device main body and a braking circuit as described in the first aspect or a motor as described in the second aspect provided on the device main body.

[0019] From the above content, it can be concluded that the present application has the following beneficial effects:

[0020] In the present application, a braking resistor is connected to the motor voltage output terminal and a switching module, and the switching module is connected to a first transistor. The control terminal of the first transistor accesses a control signal, and the first transistor is controlled to conduct or disconnect alternately through the control signal, so that the switching module also conducts or disconnects alternately with the first transistor. When conducting, the braking resistor is electrically connected between the conducting switching module and the first transistor and the ground terminal to consume the braking voltage at the motor voltage output terminal. When disconnecting, the electrical connection between the braking resistor and the ground terminal is disconnected, realizing the alternate electrical conduction or disconnection between the braking resistor and the ground terminal, and intermittently consuming the braking voltage at the motor voltage output terminal. It can not only effectively ensure the energy consumption, but also optimize the selection of the braking resistor, achieving the best match between cost and performance. Compared with the aluminum alloy resistor in the related technology, it reduces power consumption, reduces volume, makes the circuit easy to assemble, and saves costs. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is a schematic diagram of the principle of a braking circuit in the related technology;

[0023] Figure 2 is a schematic structural diagram of the braking circuit provided in the embodiment of the present application;

[0024] Figure 3 is another schematic structural diagram of the braking circuit provided in the embodiment of the present application;

[0025] Figure 4 is a schematic circuit diagram of the braking circuit provided in the embodiment of the present application. Detailed Embodiments

[0026] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where 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 by referring to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0027] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0028] In the embodiments of the present application, it should be noted that, in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0029] Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that an article or device including a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the article or device including the element.

[0030] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, explanations or descriptions. Any embodiment or design solution described as "for example" or "example" in the embodiments of the present application is not construed as being more preferred or having more advantages than another embodiment or design solution. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0031] In addition, "a plurality of" in the embodiments of the present application means two or more. In view of this, "a plurality of" in the embodiments of the present application can also be understood as "at least two". "At least one" can be understood as one or more, for example, understood as one, two or more. For example, including at least one means including one, two or more, and does not limit which ones are included. For example, including at least one of A, B, and C, then what can be included are A, B, C, A and B, A and C, B and C, or A and B and C.

[0032] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, when A is connected to B, it can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0033] In the embodiments of the present application, the first pole / first end of each transistor is one of the source and the drain, and the second pole / second end of each transistor is the other of the source and the drain. Since the source and the drain of a transistor can be symmetric in structure, there may be no difference between its source and drain in structure. That is to say, there may be no difference between the first pole / first end and the second pole / second end of the transistors in the embodiments of the present application in structure. Exemplarily, when the transistor is a P-type transistor, the first pole / first end of the transistor is the source, and the second pole / second end is the drain; Exemplarily, when the transistor is an N-type transistor, the first pole / first end of the transistor is the drain, and the second pole / second end is the source.

[0034] In the circuit structure provided by the embodiments of the present application, nodes such as the first node and the second node do not represent actually existing components, but represent the convergence points of relevant couplings in the circuit diagram. That is to say, these nodes are nodes equivalent to the convergence points of relevant couplings in the circuit diagram.

[0035] Before introducing the braking circuit, the motor and the electronic device of the present application, the relevant background information of the embodiments of the present application will be introduced first.

[0036] As Figure 1 shown, Figure 1 is a schematic diagram of the principle of a braking circuit in the related art. The socket CN11 in the figure is connected to a braking resistor ( Figure 1 not shown), U11 is a driving chip, and VDC' is the motor voltage. Specifically, the fixed-level signal BRK_Con from the Microcontroller Unit (MCU) is input to the input terminal INA of the driving chip U11 after passing through the resistor R11. After level conversion by the driving chip U11, the driving signal output by the output terminal OUTA of the driving chip U11 drives the transistor Q11 to the transistor Q11, thereby driving the transistor Q11 to conduct. The braking resistor connected to the socket CN11 starts to work, consuming the motor voltage VDC' and realizing the consumption of the regenerative energy during motor braking.

[0037] However, the braking resistors in the related art usually use at least two parallel aluminum alloy resistors. The greater the power consumption, the more the number of parallel aluminum alloy resistors, and thus the larger the volume, resulting in problems of difficult assembly and high cost during the assembly of the aluminum alloy resistors into the motor.

[0038] Based on this, embodiments of the present application provide a braking circuit, a motor, and an electronic device. The braking circuit controls the switch module to conduct or disconnect alternately, so as to control the electrical connection or disconnection between the braking resistor and the ground terminal alternately, and intermittently consume the braking voltage at the motor voltage output terminal, which can effectively ensure the energy consumption. Moreover, by using the braking circuit of the embodiments of the present application, only one aluminum alloy resistor or other types of resistors can be used, and it is not limited to selecting aluminum alloy resistors. Therefore, compared with the form of using multiple aluminum alloy resistors in parallel in the related art, the selection of the braking resistor can be optimized, the overall volume can be reduced, and it is convenient to be assembled into the motor, achieving the best match between cost and performance.

[0039] The braking circuit, the motor, and the electronic device provided by the present application will be introduced in detail below.

[0040] First, embodiments of the present application provide a braking circuit, which can be used for a motor or an electronic device integrating the motor. The electronic device can be an electric control product such as a lifting product, a treadmill, or a motor-based strength training device.

[0041] Please refer to Figure 2 , Figure 2 , which is a schematic structural diagram of the braking circuit provided in the embodiments of the present application. The braking circuit 100 may include a first transistor QM1, a first resistor module 110, a switch module 120, and a braking resistor 130. The braking resistor 130 is connected to the motor voltage output terminal and the switch module 120.

[0042] Among them, the control terminal of the first transistor QM1 accesses a control signal to conduct or disconnect alternately in response to the control signal. The first end of the first transistor QM1 is connected to the first end of the first resistor module 110 and the switch module 120, and the second end of the first transistor QM1 is connected to the ground terminal GND. The second end of the first resistor module 110 is connected to the drive voltage output terminal and the switch module 120.

[0043] The switch module 120 can be used to conduct in response to the voltage difference of the first resistor module 110 when the first transistor QM1 conducts, and disconnect when the first transistor QM1 disconnects. The voltage difference of the first resistor module 110 is generated based on the drive voltage provided by the drive voltage output terminal.

[0044] The braking resistor 130 can be used to connect to the ground terminal GND through the conducting switch module 120 and the first transistor QM1 to consume the braking voltage at the motor voltage output terminal when the switch module 120 conducts, and disconnect the electrical connection with the ground terminal GND when the switch module 120 disconnects.

[0045] In the embodiments of the present application, the first transistor QM1 may adopt any existing controllable switch device, including but not limited to a triode, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), etc., and can be specifically determined according to the actual application scenario.

[0046] Referring to Figure 2 , as an example, if the first transistor QM1 is an NPN-type triode, the control terminal of the triode, i.e., the base, can be connected to a control signal. The first terminal of the triode, i.e., the collector, is connected to the first resistor module 110 and the switch module 120, and the second terminal of the triode, i.e., the emitter, is connected to the ground terminal GND. The triode can change its own on or off state according to the level of the control signal applied to its base.

[0047] When the control signal is at a high level, the first transistor QM1 is turned on, and the branch where the first resistor module 110 is located is electrically turned on based on the driving voltage provided by the driving voltage output terminal. When the branch is electrically turned on, there will be a voltage difference across the two ends of the first resistor module 110, thereby driving the switch module 120 to turn on. At this time, both the switch module 120 and the first transistor QM1 are turned on, and the branch where the braking resistor 130 is located, i.e., Figure 2 the branch indicated by the red arrow in

[0048] is turned on, that is, there is electrical conduction between the braking resistor 130 and the ground terminal GND, so that the braking resistor 130 is energized to consume the braking voltage output by the motor voltage output terminal.

[0049] In the embodiments of the present application, the braking resistor 130 is connected to the motor voltage output terminal and the switching module 120, and the switching module 120 is connected to the first transistor QM1. The control terminal of the first transistor QM1 is connected to a control signal. The first transistor QM1 is controlled to conduct or disconnect alternately through the control signal, so that the switching module 120 also conducts or disconnects alternately with the first transistor QM1. When conducting, the braking resistor 130 is electrically connected to the ground terminal GND through the conducting switching module 120 and the first transistor QM1 to consume the braking voltage at the motor voltage output terminal. When disconnecting, the electrical connection between the braking resistor 130 and the ground terminal GND is disconnected, realizing the alternate electrical conduction or disconnection between the braking resistor 130 and the ground terminal GND, intermittently consuming the braking voltage at the motor voltage output terminal, which can not only effectively ensure the energy consumption, but also optimize the selection of the braking resistor, achieving the best match between cost and performance, reducing power consumption, reducing volume, making the circuit easy to assemble, and saving costs.

[0050] Next, continue to Figure 2 elaborate in detail on each unit module shown and the specific implementation manners that may be adopted in practical applications.

[0051] As Figure 3 shown, in some embodiments of the present application, the braking circuit 100 may further include a main control module 140. The main control module 140 is connected to the control terminal of the first transistor QM1 to output a control signal to the first transistor QM1, where the control signal is a pulse width modulation signal.

[0052] In the embodiments of the present application, the main control module 140 may be a controller such as an MCU or a central processing unit (CPU), and the control signal may be a pulse width modulation (PWM) signal.

[0053] The main control module 140 outputs a PWM signal to the first transistor QM1, which can cause the first transistor QM1 to switch between two states of conduction and disconnection according to the high and low levels of the PWM signal.

[0054] In the embodiments of the present application, the control signal may be a PWM signal with adjustable frequency and duty cycle. In practical applications, the duty cycle of the PWM signal can be dynamically adjusted according to the energy that the braking resistor 130 needs to consume, so as to adjust the conduction and disconnection duration of the first transistor QM1, which is equivalent to adjusting the power-on and power-off duration of the braking resistor 130, and adjusting the optimal energy consumption scheme, so as to balance the energy consumption and the selection of the braking resistor 130, achieving the best match between cost and performance.

[0055] For example, the braking resistor 130 is selected as an aluminum alloy resistor. When the motor brakes, the braking resistor 130 needs to consume X joules of energy. According to the performance parameters of the aluminum alloy resistor and multiple experiments, when the duty cycle of the PWM signal is 70%, it can ensure that the temperature rise meets the requirements and achieve the optimal energy consumption while consuming energy. Therefore, in practical applications, the duty cycle of the PWM signal output by the main control module 140 can be adjusted to 70%, so that within one clock cycle, the conduction duration of the first transistor QM1 accounts for 70% of the clock cycle, that is, the energization duration of the braking resistor 130 for energy consumption accounts for 70% of the clock cycle, and the disconnection duration of the first transistor QM1, that is, the power-off duration of the braking resistor 130, accounts for 30% of the clock cycle.

[0056] It can be understood that when the selection of the braking resistor 130, the energy to be consumed by the braking resistor 130, and / or the application scenario change, by adjusting the duty cycle of the PWM signal, the energization and power-off durations of the braking resistor 130 can be controlled, so as to achieve the optimal energy consumption scheme.

[0057] Please refer to Figure 4 , in some embodiments of the present application, the first resistor module 110 may include at least one resistor, and at least one resistor is connected in series between the driving voltage output terminal and the first end of the first transistor QM1.

[0058] As an example, the driving voltage output terminal can output a 15V driving voltage. The first resistor module 110 includes a first resistor RM1, and the first resistor RM1 is connected in series between the first end of the first transistor QM1 and the driving voltage output terminal, so as to generate a voltage difference based on the 15V driving voltage of the driving voltage output terminal to drive the switching module 120 to conduct when the first transistor QM1 conducts. It can be understood that in some other embodiments, the first resistor module 110 may further include 2, 3 or more resistors, and multiple resistors can be connected in series between the driving voltage output terminal and the first end of the first transistor QM1 in sequence. The number of series-connected resistors can be determined according to the actual application scenario and is not limited here.

[0059] Please continue to refer to Figure 3 , in some embodiments of the present application, the braking circuit 100 may further include a current limiting module 150 connected to the control end of the first transistor QM1. The current limiting module 150 can be used to limit the current flowing into the control end of the first transistor QM1 to protect the first transistor QM1.

[0060] In some embodiments of the present application, the current limiting module 150 may include at least one current limiting resistor, and at least one current limiting resistor is connected in series to the control end of the first transistor QM1.

[0061] Please continue to refer to Figure 4, in the embodiments of the present application, a current-limiting resistor RD1 can be connected in series to the control terminal of the first transistor QM1 to limit the current input to the control terminal of the first transistor QM1, thereby preventing the transistor from being damaged due to excessive current.

[0062] It can be understood that in some other embodiments, the current-limiting module 150 may further include more current-limiting resistors, that is, two, three or more current-limiting resistors can be connected in series to the control terminal of the first transistor QM1. The number of series-connected current-limiting resistors can be determined according to the actual application scenario and is not limited herein.

[0063] Please continue to refer to Figure 4 , in some embodiments of the present application, the switch module 120 may include a second transistor QM2. The control terminal of the second transistor QM2 is connected to the first end of the first transistor QM1. The first end of the second transistor QM2 is connected to the driving voltage output terminal. The second end of the second transistor QM2 is connected to the braking resistor 130. In the embodiments of the present application, the braking resistor 130 is connected to the second end of the second transistor QM2 through the first socket CN1.

[0064] The second transistor QM2 can be any existing MOS transistor, including but not limited to P-type MOS transistors and N-type MOS transistors, and can be specifically determined according to the actual application scenario.

[0065] In the embodiments of the present application, the second transistor QM2 is a P-type MOS transistor. When the first transistor QM1 is turned on, there is a voltage drop across the first resistor RM1, causing a voltage difference between the gate G and the source S of the second transistor QM2, and the voltage of the source S is greater than the voltage of the gate G, thereby driving the second transistor QM2 to conduct. When the second transistor QM2 conducts, the braking resistor 130 connected to the first socket CN1 is electrically connected to the ground terminal GND through the conducting second transistor QM2, the first resistor RM1, and the first transistor QM1, and the braking resistor 130 is energized to consume the braking voltage VDC output from the motor voltage output terminal;

[0066] When the first transistor QM1 is turned off, the branch is open, there is no voltage difference between the gate G and the source S of the second transistor QM2, so the second transistor QM2 is turned off, causing the braking resistor 130 to be electrically disconnected from the ground terminal GND, and the braking resistor 130 is de-energized and does not consume the braking voltage VDC output from the motor voltage output terminal.

[0067] In some embodiments of the present application, the switch module 120 may further include a resistor-capacitor filtering unit, such as Figure 4As shown, the RC filtering unit may include a filtering capacitor CM1 connected in parallel between the control terminal and the first terminal of the second transistor QM2, and a filtering resistor RM2 connected in series between the first terminal of the first transistor QM1 and the control terminal of the second transistor QM2.

[0068] In the embodiments of the present application, the RC filtering unit can filter out the clutter mixed in the voltage signal flowing to the second transistor QM2, ensuring that the second transistor QM2 is not interfered by the clutter.

[0069] In some embodiments of the present application, the braking circuit 100 may further include a diode D1 connected in parallel with the braking resistor 130, and the anode of the diode D1 is connected to the switch module 120, and the cathode of the diode D1 is connected to the motor voltage output terminal.

[0070] As Figure 4 shown, the anode of the diode D1 may be connected to the drain of the second transistor QM2, the cathode of the diode D1 is connected to the motor voltage output terminal, and the diode D1 may be a fast recovery rectifier diode.

[0071] In the embodiments of the present application, when the first transistor QM1 or the second transistor QM2 fails and is accidentally disconnected, the diode D1 and the braking resistor 130 connected to the first socket CN1 can form a consumption loop, so that the braking resistor 130 can continue to consume the residual energy at the motor voltage output terminal until it is consumed completely to protect the motor.

[0072] The braking circuit in the embodiments of the present application uses general resistors, capacitors, small signal switching diodes, triodes, MOS transistors, etc. in the industry, with obvious cost advantages, extremely low power consumption of the power supply, and the switches are not turned on during normal operation of the device, with basically no power consumption, and basically no impact on the efficiency of the power supply and standby power consumption, saving electric energy and being environmentally friendly.

[0073] Based on the braking circuit in the above embodiments, on the basis of the above embodiments, the embodiments of the present application further provide a motor, which may include a motor main body and a braking circuit as described in Figures 2 to 4 any corresponding embodiment.

[0074] Since the motor includes the braking circuit in the present application as Figures 2 to 4 described in any corresponding embodiment, therefore, all the beneficial effects that can be achieved by the braking circuit in any corresponding embodiment of the present application can be realized. For details, please refer to the previous description and will not be repeated here. Figures 2 to 4

[0075] Figures 2 to 4 On the basis of the above embodiments, the embodiments of the present application further provide an electronic device, which may include a device main body and a braking circuit as described in Figures 2 to 4Corresponding to the braking circuit or the motor in any embodiment.

[0076] The electronic device can be an electronically controlled product such as a lifting product, a treadmill, a motor-based strength training device, etc.

[0077] Since the electronic device includes the braking circuit of the present application as Figures 2 to 4 corresponding to the braking circuit in any embodiment, therefore, the present application as Figures 2 to 4 can achieve all the beneficial effects that the braking circuit in any embodiment can achieve. For details, see the previous description and will not be repeated here.

[0078] The above are only the preferred embodiments of the present application and do not impose any formal restrictions on the present application. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present application. However, as long as it does not depart from the content of the technical solution of the present application, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A braking circuit, characterized in that: It includes a first transistor, a first resistor module, a switch module and a brake resistor, wherein the brake resistor is connected to the motor voltage output terminal and the switch module; The control end of the first transistor is connected to a control signal so as to be alternately turned on or off in response to the control signal, the first end of the first transistor is connected to the first end of the first resistor module and the switch module, the second end of the first transistor is connected to the ground end, and the second end of the first resistor module is connected to the driving voltage output end and the switch module; The switch module is configured to be turned on in response to a voltage difference of the first resistor module when the first transistor is turned on, and to be turned off when the first transistor is turned off, the voltage difference of the first resistor module being generated based on the driving voltage provided by the driving voltage output terminal; The braking resistor is used to connect the ground terminal through the turned-on switching module and the first transistor when the switching module is turned on, so as to consume the braking voltage at the motor voltage output terminal, and to disconnect the electrical connection with the ground terminal when the switching module is turned off.

2. The brake circuit according to claim 1, characterized in that: The braking circuit further includes a main control module, which is connected to the control end of the first transistor to output the control signal to the first transistor, wherein the control signal is a pulse width modulation signal.

3. The brake circuit according to claim 1, characterized in that: The first resistor module includes at least one resistor, and the at least one resistor is connected in series between the driving voltage output terminal and the first terminal of the first transistor.

4. The brake circuit according to claim 1, characterized in that: The braking circuit further includes a current limiting module connected to the control end of the first transistor, and the current limiting module is used to limit the current flowing into the control end of the first transistor.

5. The brake circuit according to claim 4, characterized in that: The current limiting module includes at least one current limiting resistor, and the at least one current limiting resistor is connected in series to the control end of the first transistor.

6. The brake circuit according to claim 1, characterized in that: The switch module includes a second transistor, a control end of the second transistor is connected to a first end of the first transistor, a first end of the second transistor is connected to the driving voltage output end, and a second end of the second transistor is connected to the braking resistor.

7. The brake circuit according to claim 6, characterized in that: The switch module further includes a RC filter unit, which includes a filter capacitor connected in parallel between the control terminal and the first terminal of the second transistor, and a filter resistor connected in series between the first terminal of the first transistor and the control terminal of the second transistor.

8. The brake circuit according to any one of claims 1 to 7, characterized in that: The braking circuit further includes a diode connected in parallel with the braking resistor, wherein an anode of the diode is connected to the switch module, and a cathode of the diode is connected to the motor voltage output terminal.

9. A motor, characterized in that: The invention comprises a motor body and a brake circuit as claimed in any one of claims 1 to 8 arranged on the motor body.

10. An electronic device, characterized in that: The invention comprises a device body and a brake circuit as claimed in any one of claims 1 to 8 or a motor as claimed in claim 9 arranged on the device body.

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