Direct current motor multiplexing control circuit and control method

Abstract

The invention discloses a direct current motor multiplexing control circuit and control method, the circuit comprises a multiplexing module, a plurality of power bridge arms and a plurality of load motors, the plurality of power bridge arms are arranged in parallel, and one load motor is arranged between each power bridge arm and the multiplexing module; the first pole of the multiplexing module and the first poles of the plurality of power bridge arms connected in parallel are connected to a power supply voltage VCC and are used for supplying power to the whole circuit; and the second pole of the multiplexing module and the second poles of the plurality of power bridge arms connected in parallel are connected to the negative pole of the power voltage or grounded, and are used for protecting the circuit or returning current. The multi-load motor is overlapped and multiplexed through the multiplexing module, the utilization rate is improved, the multiplexing module is a half bridge of the H-bridge circuit, a plurality of power bridge arms are arranged in the other bridge arm direction, driving control over one or more load motors can be achieved in the same circuit, the number of devices is effectively reduced, the cost is reduced, and the reliability of the circuit is improved. The mutual inductance and electromagnetic interference of the device on the PCB are further reduced, and the reliability of the circuit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of DC motor control, and particularly to a multiplexed control circuit and control method for DC motors. Background Art

[0002] DC motors have the advantages of strong adaptability, high reliability, and easy control, and are widely used in industrial fields, transportation, household appliances, medical fields, etc. With the continuous progress of technology and the increasing application requirements, most systems require multiple DC motors to work together to achieve precise motion control and operation.

[0003] The existing DC motor control method uses an H-bridge topology to complete single-motor control. Therefore, in a system that requires multiple motors to work together, when applying multiple motors, it is mainly completed by arranging multiple H-bridge topologies in parallel. In the multi-motor collaborative control circuit formed by arranging multiple H-bridge topologies in parallel, each H-bridge sub-circuit requires at least 4 transistors and corresponding drive circuits and control interfaces, and the H-bridge sub-circuits in the multi-motor collaborative control circuit will increase with the increase in the number of motor controls. Therefore, this results in a complex power unit structure and low utilization rate of the existing multi-motor collaborative control circuit. On the other hand, each circuit unit needs to be configured with corresponding drive circuits and control interface resources, which all increase the hardware cost, wiring difficulty, and reduce the reliability, resulting in a low cost performance of the system.

[0004] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0005] Existing multi-motor collaborative control circuits are all separate independent control systems. When introduced into a PCB circuit board, they are complex in design, have low utilization rate, large power loss, high device cost, large stray interference between devices, and reduced circuit reliability. Summary of the Invention

[0006] The purpose of the present invention is to provide a multiplexed control circuit and control method for DC motors to solve the technical problems in the prior art that existing multi-motor collaborative control circuits are all separate independent control systems, which are complex in design, have low utilization rate, large power loss, high device cost, large stray interference between devices, and reduced circuit reliability when introduced into a PCB circuit board.

[0007] The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A DC motor multiplexing control circuit provided by the present invention includes a multiplexing module, a plurality of power bridge arms, and a plurality of load motors. The plurality of power bridge arms are arranged in parallel, and one of the load motors is arranged between each power bridge arm and the multiplexing module; the first pole of the multiplexing module and the first poles of the plurality of power bridge arms after parallel connection are both connected to the power supply voltage VCC for supplying power to the entire circuit; the second pole of the multiplexing module and the second poles of the plurality of power bridge arms after parallel connection are both connected to the negative pole of the power supply voltage or grounded for protecting the circuit or current return.

[0010] Optionally, the multiplexing module includes a multiplexing transistor Q1 and a multiplexing transistor Q2. The multiplexing transistor Q1 and the multiplexing transistor Q2 are arranged in parallel. The first pole of the multiplexing transistor Q1 is connected to the power supply voltage VCC. The second pole of the multiplexing transistor Q1 and the first pole of the multiplexing transistor Q2 are both connected to the first stage of the plurality of load motors. The second pole of the multiplexing transistor Q2 is connected to the negative pole of the power supply voltage or grounded.

[0011] Optionally, each power bridge arm includes a first power transistor and a second power transistor. The first power transistor and the second power transistor are arranged in series. The second poles of the plurality of load motors are respectively connected between the first power transistor and the second power transistor of the corresponding power bridge arm; the first pole of the first power transistor is connected to the power supply voltage VCC, and the second pole of the second power transistor is connected to the negative pole of the power supply voltage or grounded.

[0012] Optionally, when the load motor rotates forward, the multiplexing transistor Q1 and the second power transistor corresponding to the forward-rotating load motor are turned on, and the multiplexing transistor Q2 and the first power transistor corresponding to the forward-rotating load motor are turned off; when the load motor rotates reversely, the multiplexing transistor Q1 and the second power transistor corresponding to the reversely-rotating load motor are turned off, and the multiplexing transistor Q2 and the first power transistor corresponding to the reversely-rotating load motor are turned on.

[0013] Optionally, it further includes a chopper voltage regulation module. The chopper voltage regulation module is arranged between the first pole of the multiplexing transistor Q1 and the power supply voltage VCC, and the chopper voltage regulation module is connected to the negative pole of the power supply voltage or grounded.

[0014] Optionally, the chopper voltage regulation module includes a chopper voltage regulation triode Q0, an inductor L1, a freewheeling diode D1, a capacitor C1, and a capacitor C2. The chopper voltage regulation triode Q0 and the inductor L1 are arranged between the first pole of the multiplexing transistor Q1 and the power supply voltage VCC, and the second pole of the chopper voltage regulation triode Q0 is connected to the first pole of the inductor L1; the first pole of the freewheeling diode D1 is connected between the chopper voltage regulation triode Q0 and the inductor L1, and the second pole of the freewheeling diode D1 is connected to the negative pole of the power supply voltage or the ground pole; the first pole of the capacitor C1 is connected between the power supply voltage VCC and the chopper voltage regulation triode Q0, and the second pole of the capacitor C1 is connected to the negative pole of the power supply voltage or the ground pole; the first pole of the capacitor C2 is connected between the inductor L1 and the first pole of the multiplexing transistor Q1, and the second pole of the capacitor C2 is connected to the negative pole of the power supply voltage or the ground pole.

[0015] Optionally, it further includes a detection resistor R1. The first pole of the detection resistor R1 is connected to the power supply voltage VCC, and the second pole of the detection resistor R1 is connected to the first pole of the multiplexing module and the first poles of multiple power bridge arms; the detection resistor R1 is used to detect the current information of the DC motor multiplexing control circuit, so that the DC motor multiplexing control circuit adjusts the switching states of the multiplexing module and the above-mentioned power bridge arms according to the collected current information.

[0016] A DC motor multiplexing control method is applied to any one of the above-mentioned DC motor multiplexing control circuits, and includes:

[0017] Sending a first driving signal to the DC motor multiplexing control circuit;

[0018] The DC motor multiplexing control circuit controls the target multiplexing transistor of the multiplexing module and the target power transistor of the power bridge arm corresponding to the target load motor to be in the conducting state according to the first driving signal, so that the target load motor operates.

[0019] Optionally, the DC motor multiplexing control circuit controls the target multiplexing transistor of the multiplexing module and the target power transistor of the power bridge arm corresponding to the target load motor to be in the conducting state according to the first driving signal, so that the target load motor operates, including:

[0020] If the first driving signal is a load motor forward rotation signal, the DC motor multiplexing control circuit controls the multiplexing transistor Q1 and the second power transistor corresponding to the target load motor to be in the conducting state, and at the same time controls the multiplexing transistor Q2 and the first power transistor corresponding to the target load motor to be in the off state, so that the target load motor rotates forward;

[0021] If the first driving signal is a reverse signal for the load motor, the DC motor multiplexing control circuit controls the multiplexing transistor Q2 and the first power transistor corresponding to the target load motor to be in the on state, and simultaneously controls the multiplexing transistor Q1 and the second power transistor corresponding to the target load motor to be in the off state, so that the target load motor rotates in reverse.

[0022] Optionally, the method further includes:

[0023] Sending a second driving signal to the chopper voltage regulation module of the DC motor multiplexing control circuit, so that the chopper voltage regulation module adjusts the output voltage or current of the DC motor multiplexing control circuit according to the second driving signal.

[0024] Implementing one of the above technical solutions of the present invention has the following advantages or beneficial effects:

[0025] 1. By multiplexing the multiplexing module for multiple load motors, the present invention improves the utilization rate. By combining the multiplexing module with multiple power bridge arms, the driving control of one or more load motors can be realized in the same electrical topology structure, effectively reducing the number of devices by 2×(n - 1), where n is the number of half-bridge structures cooperating with the multiplexing bridge arm or the number of load motors to be driven, reducing costs, further reducing the mutual inductance and electromagnetic interference of the devices on the PCB circuit board, and improving the reliability of the circuit.

[0026] 2. The multiplexing module of the present invention can form an H-bridge power circuit with any other single power bridge arm and act on the corresponding load motor; the multiplexing module can also form a multiplexing H-bridge structure with several parallel power bridge arms and act on the corresponding load motor, and can synchronously control the operation of one or more H-bridges, saving the control cost of power devices and improving the control efficiency.

[0027] 3. By adding a chopper voltage regulation module to the DC motor multiplexing control circuit, the present invention can quickly respond to load changes and maintain the stability of the output voltage or current. At the same time, through the high-frequency switching operation of the chopper voltage regulation triode, energy transfer is realized. Moreover, when the switching device is on, the resistance is small, and when it is off, the leakage current is small, reducing power loss. Compared with a linear voltage regulator, the present invention has higher efficiency and less power loss energy loss.

[0028] 4. For the control circuit provided by the present invention, regardless of how the external load operates (the load motor rotates forward or backward), the control circuit can detect the magnitude and overcurrent state of the current in the entire loop and feedback it to the external control circuit. The external control circuit adjusts the power supply voltage VCC and the corresponding transistor driving signal to achieve power regulation, ensuring the safety and stability of the entire control circuit during operation.

[0029] 5. The DC motor multiplexing control method provided by the present invention controls the corresponding transistors in the multiplexing module and several power bridge arms through control signals, enabling one or more motors to operate in the same direction. The control mode is simple, which can ensure the consistency of each transistor in the forward and reverse operating states, and further ensure the stability and reliability of the control circuit operation.

[0030] 6. The control method of the present invention realizes multi-aspect control of the control circuit through the first driving signal, with high integration and low cost. At the same time, it can be adjusted according to the real-time operating conditions of the multiplexing module, power bridge arm, and load motor in the DC motor multiplexing control circuit, ensuring the safety and stability of the DC motor multiplexing control circuit operation, and further ensuring the stability of the external load motor application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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 invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings:

[0032] Figure 1 is the circuit diagram of Embodiment 1 of the present invention;

[0033] Figure 2 is the circuit diagram of one load motor rotating forward in Embodiment 1 of the present invention;

[0034] Figure 3 is the circuit diagram of one load motor rotating in reverse in Embodiment 1 of the present invention;

[0035] Figure 4 is the circuit diagram of multiple load motors rotating forward in Embodiment 1 of the present invention;

[0036] Figure 5 is the circuit diagram of multiple load motors rotating in reverse in Embodiment 1 of the present invention;

[0037] Figure 6 is the circuit diagram of Embodiment 2 of the present invention;

[0038] Figure 7 is the first circuit diagram of Embodiment 3 of the present invention;

[0039] Figure 8 is the second circuit diagram of Embodiment 3 of the present invention;

[0040] Figure 9 is the circuit diagram of one load motor rotating forward in Embodiment 3 of the present invention;

[0041] Figure 10It is the circuit diagram of one load motor reversing in the third embodiment of the present invention;

[0042] Figure 11 It is the circuit diagram of multiple load motors rotating forward in the third embodiment of the present invention;

[0043] Figure 12 It is the circuit diagram of multiple load motors reversing in the third embodiment of the present invention;

[0044] Figure 13 It is the flowchart of the fourth embodiment of the present invention. Detailed implementation manners

[0045] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, various exemplary embodiments to be described below will refer to the corresponding drawings, which form a part of the exemplary embodiments and describe various exemplary embodiments that may be adopted to implement the present invention. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. It should be understood that they are only examples of processes, methods, devices, etc. consistent with some aspects of the present invention disclosed in detail in the appended claims. Other embodiments may also be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and essence of the present invention.

[0046] In the description of the present invention, it should be understood that terms such as "center", "longitudinal", "lateral", etc. indicate the orientation or positional relationship based on the orientation shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. Terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. The meaning of the term "multiple" is two or more. The terms "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. The term " / and" includes any and all combinations of one or more of the related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In order to illustrate the technical solutions described in the present invention, the following will be described through specific embodiments, and only the parts related to the embodiments of the present invention are shown.

[0048] Embodiment 1:

[0049] AsFigure 1 As shown in Figure 1 , the present invention provides a DC motor multiplexing control circuit, which includes a multiplexing module, a plurality of power bridge arms, and a plurality of load motors. The plurality of power bridge arms are arranged in parallel, and a load motor is provided between each power bridge arm and the multiplexing module. The first pole of the multiplexing module and the first poles of the plurality of power bridge arms after parallel connection are both connected to the power supply voltage VCC for powering the entire circuit. The second pole of the multiplexing module and the second poles of the plurality of power bridge arms after parallel connection are both connected to the negative pole of the power supply voltage or grounded for protecting the circuit or current return. Specifically, the multiplexing module cooperates with one or more power bridge arms to control one or more load motors. The plurality of load motors include M1, M2,..., Mn, and the specific quantity is set according to actual requirements. The quantity of the power bridge arms is adaptively set according to the quantity of the load motors. Each load motor is correspondingly provided with a power bridge arm. Compared with the traditional control circuit, the DC motor multiplexing control circuit of the present invention can save at least 2×(n - 1) power devices, where n is the quantity of the power bridge arms cooperating with the multiplexing bridge arm or the quantity of the motors to be driven, greatly reducing the application cost of motor drive.

[0050] The present invention improves the utilization rate by multiplexing the multiplexing module for multiple load motors. By combining the multiplexing module with a plurality of power bridge arms, it can realize the drive control of one or more load motors in the same electrical topology structure, effectively reducing the quantity of devices, lowering the cost, further reducing the mutual inductance and electromagnetic interference of the devices on the PCB circuit board, and improving the reliability of the circuit. At the same time, the multiplexing module of the present invention can form an H-bridge power circuit with any other single power bridge arm and act on the corresponding load motor; the multiplexing module can also form a multiplexing H-bridge structure with several parallel power bridge arms and act on the corresponding load motor, and can synchronously control the operation of one or more H-bridges, saving the control cost of power devices and improving the control efficiency.

[0051] As an alternative embodiment, the multiplexing module includes a multiplexing transistor Q1 and a multiplexing transistor Q2. The multiplexing transistor Q1 and the multiplexing transistor Q2 are arranged in parallel. The first pole of the multiplexing transistor Q1 is connected to the power supply voltage VCC. The second pole of the multiplexing transistor Q1 and the first pole of the multiplexing transistor Q2 are both connected to the first stage of a plurality of load motors. The second pole of the multiplexing transistor Q2 is connected to the negative pole of the power supply voltage or grounded. Specifically, the on / off states of the multiplexing transistor Q1 and the multiplexing transistor Q2 are controlled by drive signals, and the multiplexing transistor Q1 and the multiplexing transistor Q2 are not turned on simultaneously. When the load motor rotates forward, the multiplexing transistor Q1 is turned on and the multiplexing transistor Q2 is turned off. When the load motor rotates in reverse, the multiplexing transistor Q1 is turned off and the multiplexing transistor Q2 is turned on. That is, when the control circuit is working, the switch states of the multiplexing transistor Q1 and the multiplexing transistor Q2 are complementary. Further, the transistors of the present invention can be MOSFETs, IGBTs or other triode switch devices. Exemplarily, the present invention preferably uses MOSFET switch devices. The first pole of the multiplexing module and the first pole of the plurality of power bridge arms after parallel connection are both the drain or D pole of the MOSFET. The second pole of the multiplexing module and the second pole of the plurality of power bridge arms after parallel connection are both the source or S pole of the MOSFET. In addition, the third pole of the transistor is the gate or G pole of the MOSFET, which is used to receive an external drive control signal to realize the switching of the corresponding MOSFET. Preferably, the power supply voltage VCC is a DC power supply, and the voltage range of this solution is preferably 0V - 12V.

[0052] As an alternative embodiment, each power bridge arm includes a first power transistor and a second power transistor. The first power transistor and the second power transistor are arranged in series. The second poles of the plurality of load motors are respectively connected between the first power transistor and the second power transistor of the corresponding power bridge arm. The first pole of the first power transistor is connected to the power supply voltage VCC. The second pole of the second power transistor is connected to the negative pole of the power supply voltage or grounded. Specifically, the first power transistor is an upper bridge switch tube, including Q3, Q5,......, Q2n + 1, and the second power transistor is a lower bridge switch tube, including Q4, Q6,....., Q2n + 2. In each power bridge arm, the first pole of the first power transistor is connected to the power supply voltage VCC and the first pole of the multiplexing module. The second pole of the first power transistor is connected to the first pole of the second power transistor and the second pole of the corresponding load motor. The second pole of the second power transistor is connected to the negative pole of the power supply voltage or grounded. The switch states of the first power transistor and the second power transistor are complementary.

[0053] As an alternative embodiment, when the load motor rotates forward, the multiplexing transistor Q1 and the second power transistor corresponding to the forward rotating load motor are turned on, and the multiplexing transistor Q2 and the first power transistor corresponding to the forward rotating load motor are turned off. When the load motor rotates in reverse, the multiplexing transistor Q1 and the second power transistor corresponding to the reverse rotating load motor are turned off, and the multiplexing transistor Q2 and the first power transistor corresponding to the reverse rotating load motor are turned on. Specifically, when the load motor rotates forward, the multiplexing transistor Q1 and the second power transistor corresponding to the forward rotating load motor are turned on, and the multiplexing transistor Q2 and the first power transistor corresponding to the forward rotating load motor are turned off, ensuring that the current flowing out of the power supply voltage VCC will sequentially pass through the multiplexing transistor Q1, the forward rotating load motor, and the second power transistor corresponding to the forward rotating load motor, and finally flow to GND. The turning off of the multiplexing transistor Q2 and the first power transistor corresponding to the forward rotating load motor can control the current flow direction. When the load motor rotates in reverse, the multiplexing transistor Q1 and the second power transistor corresponding to the forward rotating load motor are turned off, and the multiplexing transistor Q2 and the first power transistor corresponding to the forward rotating load motor are turned on, ensuring that the current flowing out of the power supply voltage VCC will sequentially pass through the first power transistor corresponding to the reverse rotating load motor, the reverse rotating load motor, and the multiplexing transistor Q2, and finally flow to GND. The turning off of the multiplexing transistor Q1 and the second power transistor corresponding to the reverse rotating load motor can control the current flow direction.

[0054] The working principle of the protection DC motor multiplexing control circuit in this embodiment is as follows:

[0055] Exemplarily, when the control circuit drives 1 load motor to work, such as Figure 2 As shown, when the motor M1 rotates forward, the multiplexing transistor Q1 and the second power transistor Q4 are turned on, and the multiplexing transistor Q2 and the first power transistor Q3 are turned off. The current starts from the power supply voltage VCC, sequentially passes through the multiplexing transistor Q1, the motor M1, and the second power transistor Q4, and finally flows to GND; as Figure 3 shown, when the motor M1 rotates in reverse, the multiplexing transistor Q1 and the second power transistor Q4 are turned off, and the multiplexing transistor Q2 and the first power transistor Q3 are turned on. The current starts from the power supply voltage VCC, sequentially passes through the first power transistor Q3, the motor M1, and the multiplexing transistor Q2, and finally flows to GND.

[0056] Exemplarily, when multiple motors need to be driven externally, such as Figure 4As shown, when the load motors (M1, M2,....., Mn) rotate forward, the multiplexing transistor Q1 and the second power transistors (Q4, Q6,....., Q2n+2) are turned on, and the multiplexing transistor Q2 and the first power transistors (Q3, Q5,......, Q2n+1) are turned off. The current starts from the power supply voltage VCC, successively passes through the multiplexing transistor Q1, each load motor, and the second power transistor corresponding to each load motor, and finally flows to GND; as Figure 5 As shown, when the load motors (M1, M2,....., Mn) rotate in reverse, the multiplexing transistor Q1 and the second power transistors (Q4, Q6,....., Q2n+2) are turned off, and the multiplexing transistor Q2 and the first power transistors (Q3, Q5,......, Q2n+1) are turned on. The current starts from the power supply voltage VCC, successively passes through the first power transistor corresponding to each load motor, each load motor, and the multiplexing transistor Q2, and finally flows to GND.

[0057] The solution of this embodiment can achieve rapid switching of the production line drive at low cost in the production line, improving production efficiency; in the fields of automotive interconnection and motor drive, it can use the master control to synchronously turn on multiple terminal devices such as seat ventilation, seat massage, and windows, saving costs compared with traditional control, and improving the application control efficiency and device performance.

[0058] Embodiment 2:

[0059] As Figure 6 As shown, on the basis of Embodiment 1, it further includes a chopper voltage regulation module. The chopper voltage regulation module is arranged between the first pole of the multiplexing transistor Q1 and the power supply voltage VCC, and the chopper voltage regulation module is connected to the negative pole of the power supply voltage or grounded. Specifically, integrating the chopper voltage regulation module on the control circuit can quickly respond to load changes, and use PWM technology to finely adjust the power circuit, maintaining the stability of the output voltage or current, improving the safety and reliability of the application terminal, and can also be flexibly configured according to requirements, supporting multi-stage series or parallel connection to meet different power and voltage requirements. Integrating the chopper voltage regulation module with the application load improves the integration degree. The chopper voltage regulation module of the present invention adopts a buck chopper circuit that converts a higher input voltage into a lower output voltage.

[0060] As an alternative embodiment, the chopper voltage regulation module includes a chopper voltage regulation triode Q0, an inductor L1, a freewheeling diode D1, a capacitor C1, and a capacitor C2. The chopper voltage regulation triode Q0 and the inductor L1 are disposed between the first pole of the multiplexing transistor Q1 and the power supply voltage VCC, and the second pole of the chopper voltage regulation triode Q0 is connected to the first pole of the inductor L1. The first pole of the freewheeling diode D1 is connected between the chopper voltage regulation triode Q0 and the inductor L1, and the second pole of the freewheeling diode D1 is connected to the negative pole of the power supply voltage or the ground pole. The first pole of the capacitor C1 is connected between the power supply voltage VCC and the chopper voltage regulation triode Q0, and the second pole of the capacitor C1 is connected to the negative pole of the power supply voltage or the ground pole. The first pole of the capacitor C2 is connected between the inductor L1 and the first pole of the multiplexing transistor Q1, and the second pole of the capacitor C2 is connected to the negative pole of the power supply voltage or the ground pole. Specifically, the chopper voltage regulation triode Q0 serves as the switching tube of the chopper circuit. The chopper voltage regulation triode Q0 controls the energy transfer from the power supply to the load through rapid conduction and turn-off. Moreover, when the switching device is conducting, its resistance is small, and when it is turned off, the leakage current is small, reducing power loss. Compared with a linear voltage regulator, the efficiency of the present invention is higher, and the power loss energy loss is smaller. When the chopper voltage regulation triode Q0 is conducting, the current flows from the power supply to the load; when the chopper voltage regulation triode Q0 is turned off, the current is interrupted, and the voltage across the load decreases. At the same time, in this embodiment, the output voltage can also be precisely controlled by adjusting the conduction time of the switching tube, i.e., the chopper voltage regulation triode Q0. For example, during buck chopping, by extending the conduction time of the chopper voltage regulation triode Q0, a higher duty cycle is generated in the circuit, thereby generating a higher output voltage; by shortening the conduction time of the chopper voltage regulation triode Q0, a lower duty cycle is generated in the circuit, thereby generating a lower output voltage.

[0061] Further, when the chopper voltage regulating triode Q0 is turned on, the power supply voltage VCC supplies power to the load through the inductor L1, and at the same time, the inductor L1 stores energy. At this time, the current in the inductor L1 gradually increases, and the energy stored in it exists in the form of a magnetic field. When the chopper voltage regulating triode Q0 is turned off, the magnetic field in the inductor L1 begins to decay, and the energy stored in it is released through the freewheeling diode D1 or the load. More specifically, during the energy release process, the inductor L1 enables the current in the circuit to continue to flow, ensuring that the current on the load does not suddenly interrupt even during the off period of the chopper voltage regulating triode Q0, ensuring the continuity of the output current and the stability of the operation of the load application circuit. The freewheeling diode D1 can provide a freewheeling path and suppress the back electromotive force, ensuring the safety and stability of the circuit. The capacitors C1 and C2 are used for energy storage and energy transfer, ensuring the safety and stability of the circuit operation. For example, when there is a sudden change in the power supply in the power circuit application, the circuit will not suddenly stop working, causing the applied transistors to be damaged due to the voltage mutation, but the circuit can stop working smoothly, ensuring the safety of the terminal application. In this embodiment, the output voltage or current is adjusted by changing the duty cycle of the chopper voltage regulating triode Q0. When the chopper voltage regulating triode Q0 is turned on, the input power supply VCC directly supplies power to the load, the inductor L1 stores energy, and the current increases linearly; when the chopper voltage regulating triode Q0 is turned off, the current in the inductor L1 does not stop immediately, but continues to flow to the load through the freewheeling diode D1, while releasing the stored energy to keep the current continuous.

[0062] The working principle of the protection DC motor multiplexing control circuit in this embodiment is as follows:

[0063] Exemplarily, when the control circuit drives 1 load motor to work, for example, when the motor M1 rotates forward, the chopper voltage regulating triode Q0, the multiplexing transistor Q1, and the second power transistor Q4 corresponding to the motor M1 are turned on, the multiplexing transistor Q2 and the first power transistor Q3 corresponding to the motor M1 are turned off, and the current starts from the power supply voltage VCC, passes through the chopper voltage regulating triode Q0, the inductor L1, the multiplexing transistor Q1, the motor M1, and the second power transistor Q4 in sequence, and finally flows to GND; when the motor M1 rotates backward, the chopper voltage regulating triode Q0, the multiplexing transistor Q2, and the first power transistor Q3 corresponding to the motor M1 are turned on, the multiplexing transistor Q1 and the second power transistor Q4 corresponding to the motor M1 are turned off, and the current starts from the power supply voltage VCC, passes through the chopper voltage regulating triode Q0, the inductor L1, the first power transistor Q3, the motor M1, and the multiplexing transistor Q2 in sequence, and finally flows to GND.

[0064] Exemplarily, when multi-motor drive operation is required externally, for example, when the load motors (M1, M2,....., Mn) rotate forward, the chopper voltage regulating triode Q0, the multiplexing transistor Q1, and the second power transistors (Q4, Q6,......, Q2n+2) corresponding to each load motor (M1, M2,....., Mn) are turned on, the multiplexing transistor Q2 and the first power transistors (Q3, Q5,......, Q2n+1) corresponding to each load motor (M1, M2,....., Mn) are turned off. The current starts from the power supply voltage VCC, sequentially passes through the chopper voltage regulating triode Q0, the inductor L1, the multiplexing transistor Q1, each load motor, and the second power transistors corresponding to each load motor, and finally flows to GND. When the load motors (M1, M2,....., Mn) rotate in reverse, the chopper voltage regulating triode Q0, the multiplexing transistor Q2, and the first power transistors (Q3, Q5,......, Q2n+1) corresponding to each load motor (M1, M2,....., Mn) are turned on, the multiplexing transistor Q1 and the second power transistors (Q4, Q6,......, Q2n+2) corresponding to each load motor (M1, M2,....., Mn) are turned off. The current starts from the power supply voltage VCC, sequentially passes through the chopper voltage regulating triode Q0, the inductor L1, the first power transistors corresponding to each load motor, each load motor, and the multiplexing transistor Q2, and finally flows to GND.

[0065] In this embodiment, by adding a chopper voltage regulating module to the control circuit structure, it can quickly respond to load changes and maintain the stability of the output voltage or current. At the same time, energy transfer is achieved through the high-frequency switching operation of the chopper voltage regulating triode Q0. Moreover, when the switching device is turned on, the resistance is small, and when it is turned off, the leakage current is small, reducing power loss. Compared with the linear voltage regulator, the efficiency of this embodiment is higher, and the power loss energy loss is smaller. In addition, in this embodiment, the chopper voltage regulating module is integrated with the application load, with a high degree of integration, and can also be flexibly configured according to requirements, supporting multi-stage series or parallel connection to meet different power and voltage requirements. Furthermore, after setting the chopper voltage regulating circuit, the control circuit of this embodiment can also use PWM technology to finely adjust the power circuit to ensure the stability of the output voltage or current, improving the safety and reliability of the application terminal.

[0066] Embodiment Three:

[0067] As Figure 7 and Figure 8As shown, on the basis of Embodiment 1 or Embodiment 2, it further includes a detection resistor R1. The first pole of the detection resistor R1 is connected to the power supply voltage VCC, and the second pole of the detection resistor R1 is connected to the first pole of the multiplexing module and the first poles of multiple power bridge arms. The detection resistor R1 is used to detect the current information of the DC motor multiplexing control circuit, so that the DC motor multiplexing control circuit adjusts the switching states of the multiplexing module and the power bridge arms according to the collected current information. Specifically, on the basis of Embodiment 1, the first pole of the detection resistor R1 is directly connected to the power supply voltage VCC. On the basis of Embodiment 2, the first pole of the detection resistor R1 is connected to the power supply voltage VCC through a chopper voltage regulation module, that is, the first pole of the detection resistor R1 is connected to the common terminal of the second pole of the inductor L1 and the first pole of the capacitor C2. On the basis of Embodiment 1 or Embodiment 2, the second pole of the detection resistor R1 is connected to the common terminal of the first poles of the multiple power bridge arms after being connected in parallel and the first pole of the multiplexing transistor Q1. The detection resistor R1 is used to detect the magnitude of the current flowing back, further protecting the DC motor multiplexing control circuit and improving the circuit safety.

[0068] The working principle of protecting the DC motor multiplexing control circuit in this embodiment is as follows:

[0069] When the control circuit drives 1 load motor to work, such as Figure 9 As shown, when the motor M1 rotates forward, the chopper voltage regulation triode Q0, the multiplexing transistor Q1, and the second power transistor Q4 corresponding to the motor M1 are turned on, and the multiplexing transistor Q2 and the first power transistor Q3 corresponding to the motor M1 are turned off. The current starts from the power supply voltage VCC and sequentially passes through the chopper voltage regulation triode Q0, the inductor L1, the detection resistor R1, the multiplexing transistor Q1, the motor M1, and the second power transistor Q4, and finally flows to GND; as Figure 10 As shown, when the motor M1 rotates in reverse, the chopper voltage regulation triode Q0, the multiplexing transistor Q2, and the first power transistor Q3 corresponding to the motor M1 are turned on, and the multiplexing transistor Q1 and the second power transistor Q4 corresponding to the motor M1 are turned off. The current starts from the power supply voltage VCC and sequentially passes through the chopper voltage regulation triode Q0, the inductor L1, the detection resistor R1, the first power transistor Q3, the motor M1, and the multiplexing transistor Q2, and finally flows to GND.

[0070] Similarly, when multiple motors need to be driven externally, such as Figure 11As shown, when the load motors (M1, M2,....., Mn) rotate forward, the chopper voltage-regulating triode Q0, the multiplexing transistor Q1, and the second power transistors (Q4, Q6,......, Q2n+2) corresponding to each load motor (M1, M2,....., Mn) are turned on, the multiplexing transistor Q2 and the first power transistors (Q3, Q5,......, Q2n+1) corresponding to each load motor (M1, M2,....., Mn) are turned off, and the current starts from the power supply voltage VCC and successively passes through the chopper voltage-regulating triode Q0, the inductor L1, the detection resistor R1, the multiplexing transistor Q1, each load motor, and the second power transistors corresponding to each load motor, and finally flows to GND; as Figure 12 As shown, when the load motors (M1, M2,....., Mn) rotate in reverse, the chopper voltage-regulating triode Q0, the multiplexing transistor Q2, and the first power transistors (Q3, Q5,......, Q2n+1) corresponding to each load motor (M1, M2,....., Mn) are turned on, the multiplexing transistor Q1 and the second power transistors (Q4, Q6,......, Q2n+2) corresponding to each load motor (M1, M2,....., Mn) are turned off, and the current starts from the power supply voltage VCC and successively passes through the chopper voltage-regulating triode Q0, the inductor L1, the detection resistor R1, the first power transistors corresponding to each load motor, each load motor, and the multiplexing transistor Q2, and finally flows to GND.

[0071] For the control circuit provided in this embodiment, regardless of whether the load motor rotates forward or in reverse, the detection resistor R1 is used to detect the magnitude of the current flowing back and the overcurrent state, and feeds the detected information back to the DC motor multiplexing control circuit, and the DC motor multiplexing control circuit adjusts the driving signals of the power supply voltage VCC and the corresponding transistors (Q0, Q1, Q2, Q3,....., Q2n+1, Q2n+2), so as to achieve power adjustment and ensure the safety and stability of the entire control circuit during operation.

[0072] Embodiment 4:

[0073] As Figure 1 As shown, a DC motor multiplexing control method is applied to the DC motor multiplexing control circuit of Embodiment 1, Embodiment 2, and Embodiment 3, and includes:

[0074] S10. Send a first driving signal to the DC motor multiplexing control circuit;

[0075] S20. The DC motor multiplexing control circuit controls the target multiplexing transistor of the multiplexing module and the target power transistor of the power bridge arm corresponding to the target load motor to be in the on state according to the first driving signal, so that the target load motor operates. Specifically, after obtaining the first driving signal, the DC motor multiplexing control circuit controls the target multiplexing transistor of the multiplexing module and the target power transistor of the power bridge arm corresponding to the target load motor to be in the on state, so that the target load motor rotates forward or backward, and multiple load motors cooperate to achieve precise motion control and operation.

[0076] The present invention realizes multi-faceted control of the control circuit through the first driving signal, with high integration and low cost. At the same time, it can be adjusted according to the real-time working conditions of the multiplexing module, power bridge arm and load motor in the DC motor multiplexing control circuit, ensuring the safety and stability of the operation of the DC motor multiplexing control circuit and further ensuring the stability of the application of the load motor.

[0077] As an optional implementation manner, the DC motor multiplexing control circuit controls the target multiplexing transistor of the multiplexing module and the target power transistor of the power bridge arm corresponding to the target load motor to be in the on state according to the first driving signal, so that the target load motor operates, including:

[0078] If the first drive signal is a signal for the load motor to rotate forward, the DC motor multiplexing control circuit controls the multiplexing transistor Q1 and the second power transistor corresponding to the target load motor to be in the conducting state, and at the same time controls the multiplexing transistor Q2 and the first power transistor corresponding to the target load motor to be in the off state, so that the target load motor rotates forward. If the first drive signal is a signal for the load motor to rotate backward, the DC motor multiplexing control circuit controls the multiplexing transistor Q2 and the first power transistor corresponding to the target load motor to be in the conducting state, and at the same time controls the multiplexing transistor Q1 and the second power transistor corresponding to the target load motor to be in the off state, so that the target load motor rotates backward. Specifically, when the first drive signal received by the DC motor multiplexing control circuit is a signal for controlling the target load motor to rotate forward, the DC motor multiplexing control circuit controls the multiplexing transistor Q1 and the second power transistor corresponding to the target load motor to be in the conducting state, and at the same time controls the multiplexing transistor Q2 and the first power transistor corresponding to the target load motor to be in the off state, thereby controlling the current flow direction, so that the current starts from the power supply voltage VCC, passes through the multiplexing transistor Q1, the target load motor and the second power transistor corresponding to the target load motor in sequence, and finally flows to GND, causing the target load motor to rotate forward. When the first drive signal received by the DC motor multiplexing control circuit is a signal for controlling the target load motor to rotate backward, the DC motor multiplexing control circuit controls the multiplexing transistor Q2 and the first power transistor corresponding to the target load motor to be in the conducting state, and at the same time controls the multiplexing transistor Q1 and the second power transistor corresponding to the target load motor to be in the off state, thereby controlling the current flow direction, so that the current starts from the power supply voltage VCC, passes through the first power transistor corresponding to the target load motor, the target load motor and the multiplexing transistor Q2 in sequence, and finally flows to GND, causing the target load motor to rotate backward.

[0079] As an alternative embodiment, the method further includes: sending a second driving signal to the chopper voltage regulating module of the DC motor multiplexing control circuit, so that the chopper voltage regulating module adjusts the output voltage or current of the DC motor multiplexing control circuit according to the second driving signal. Specifically, when a chopper voltage regulating module is provided in the DC motor multiplexing control circuit, the chopper voltage regulating module can output an adjustment signal to the control circuit according to the obtained second driving signal, quickly respond to load changes, adjust the voltage or current of the control circuit, ensure the stability of the output voltage or current of the control circuit, and ensure the safety of the circuit. More specifically, if the second driving signal is the conduction signal of the chopper voltage regulating triode Q0 of the chopper voltage regulating module, the DC motor multiplexing control circuit controls the chopper voltage regulating triode Q0 to conduct, so that the current of the DC motor multiplexing control circuit flows from the power supply voltage VCC to the load motor. If the second driving signal is the turn-off signal of the chopper voltage regulating triode Q0 of the chopper voltage regulating module, the DC motor multiplexing control circuit controls the chopper voltage regulating triode Q0 to turn off, so that the current of the DC motor multiplexing control circuit is interrupted, thereby reducing the voltage of the load motor. At the same time, the chopper voltage regulating module can also control the conduction time of the chopper voltage regulating triode Q0 according to the second driving signal. If the second driving signal is a signal to increase the output voltage of the DC motor multiplexing control circuit, the DC motor multiplexing control circuit controls the conduction time of the chopper voltage regulating triode Q0 to be extended, so that the circuit generates a higher duty cycle and thus generates a higher output voltage. If the second driving signal is a signal to decrease the output voltage of the DC motor multiplexing control circuit, the DC motor multiplexing control circuit controls the conduction time of the chopper voltage regulating triode Q0 to be shortened, so that the circuit generates a lower duty cycle and thus generates a lower output voltage.

[0080] For the control method provided in this embodiment, on the one hand, by controlling the control signal to control the corresponding transistors in the multiplexing module and several power bridge arms, one or more motors can work in the same direction. The control mode is simple, which can ensure the consistency of each transistor in the forward and reverse working states, and further ensure the stability and reliability of the control circuit. On the other hand, it can realize multi-aspect control of the control circuit through one control module (external control system), with high integration and low cost. At the same time, it can be adjusted according to the real-time working conditions of the drive circuit, ensuring the safety and stability of the control circuit, and further ensuring the stability of the external load motor application.

[0081] Exemplarily, the driving loads of the present invention are all described by using motors. Those skilled in the art know that without substantial changes in the drive circuit, the driving load can also be other applications that need to be driven, such as PTC heating elements, electronic speed controllers, power supplies, etc. There is no fixed load limit here.

[0082] The above are only the preferred embodiments of the present invention. Those skilled in the art will know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.

Claims

1. A DC motor multiplexing control circuit, characterized in that: It includes a multiplexing module, multiple power bridge arms and multiple load motors, the multiple power bridge arms are arranged in parallel, and one load motor is arranged between each power bridge arm and the multiplexing module; the first pole of the multiplexing module and the first poles of the multiple power bridge arms after being connected in parallel are both connected to a power supply voltage VCC for powering the entire circuit; the second pole of the multiplexing module and the second pole of the multiple power bridge arms after being connected in parallel are both connected to the negative pole of the power supply voltage or grounded for protecting the circuit or current reflux.

2. The DC motor multiplexing control circuit according to claim 1, characterized in that: The multiplexing module includes a multiplexing transistor Q1 and a multiplexing transistor Q2, the multiplexing transistor Q1 and the multiplexing transistor Q2 are arranged in parallel, the first pole of the multiplexing transistor Q1 is connected to the power supply voltage VCC, the second pole of the multiplexing transistor Q1 and the first pole of the multiplexing transistor Q2 are both connected to the first stage of the multiple load motors, and the second pole of the multiplexing transistor Q2 is connected to the negative pole of the power supply voltage or grounded.

3. The DC motor multiplexing control circuit according to claim 2, characterized in that: Each of the power bridge arms includes a first power transistor and a second power transistor, the first power transistor and the second power transistor are arranged in series, and the second poles of the multiple load motors are respectively connected between the first power transistor and the second power transistor of the corresponding power bridge arm; the first pole of the first power transistor is connected to the power supply voltage VCC, and the second pole of the second power transistor is connected to the negative pole of the power supply voltage or is grounded.

4. The DC motor multiplexing control circuit according to claim 3, characterized in that: When the load motor rotates forward, the multiplexing transistor Q1 and the second power transistor corresponding to the load motor rotating forward are turned on, and the multiplexing transistor Q2 and the first power transistor corresponding to the load motor rotating forward are turned off; when the load motor rotates reversely, the multiplexing transistor Q1 and the second power transistor corresponding to the load motor rotating reversely are turned off, and the multiplexing transistor Q2 and the first power transistor corresponding to the load motor rotating reversely are turned on.

5. The DC motor multiplexing control circuit according to any one of claims 1 to 4, characterized in that: It also includes a chopping voltage regulation module, which is arranged between the first electrode of the multiplexing transistor Q1 and the power supply voltage VCC, and the chopping voltage regulation module is connected to the negative electrode of the power supply voltage or grounded.

6. The DC motor multiplexing control circuit according to claim 5, characterized in that: The chopper voltage regulation module includes a chopper voltage regulation transistor Q0, an inductor L1, a freewheeling diode D1, a capacitor C1 and a capacitor C2. The chopper voltage regulation transistor Q0 and the inductor L1 are arranged between the first electrode of the multiplexing transistor Q1 and the power supply voltage VCC, and the second electrode of the chopper voltage regulation transistor Q0 is connected to the first electrode of the inductor L1; the first electrode of the freewheeling diode D1 is connected between the chopper voltage regulation transistor Q0 and the inductor L1, and the second electrode of the freewheeling diode D1 is connected to the negative electrode of the power supply voltage or the ground; the first electrode of the capacitor C1 is connected between the power supply voltage VCC and the chopper voltage regulation transistor Q0, and the second electrode of the capacitor C1 is connected to the negative electrode of the power supply voltage or the ground; the first electrode of the capacitor C2 is connected between the inductor L1 and the first electrode of the multiplexing transistor Q1, and the second electrode of the capacitor C2 is connected to the negative electrode of the power supply voltage or the ground.

7. The DC motor multiplexing control circuit according to claim 1 or 6, characterized in that: It also includes a detection resistor R1, a first pole of the detection resistor R1 is connected to the power supply voltage VCC, and a second pole of the detection resistor R1 is connected to the first pole of the multiplexing module and the first poles of the plurality of power bridge arms; the detection resistor R1 is used to detect the current information of the DC motor multiplexing control circuit, so that the DC motor multiplexing control circuit adjusts the switching state of the multiplexing module and the power bridge arm according to the collected current information.

8. A DC motor multiplexing control method, characterized in that: A DC motor multiplexing control circuit as claimed in any one of claims 1 to 7, comprising: Sending a first driving signal to a DC motor multiplexing control circuit; The DC motor multiplexing control circuit controls the target multiplexing transistor of the multiplexing module and the target power transistor of the power bridge arm corresponding to the target load motor to be in the on state according to the first driving signal, so as to make the target load motor work.

9. The DC motor multiplexing control method according to claim 8, characterized in that: The DC motor multiplexing control circuit controls the target multiplexing transistor of the multiplexing module and the target power transistor of the power bridge arm corresponding to the target load motor to be in a conducting state according to the first driving signal, so that the target load motor works, including: If the first driving signal is a load motor forward rotation signal, the DC motor multiplexing control circuit controls the multiplexing transistor Q1 and the second power transistor corresponding to the target load motor to be in an on state, and controls the multiplexing transistor Q2 and the first power transistor corresponding to the target load motor to be in an off state, so that the target load motor rotates forward; If the first drive signal is a load motor reversal signal, the DC motor multiplexing control circuit controls the multiplexing transistor Q2 and the first power transistor corresponding to the target load motor to be in the on state, and at the same time controls the multiplexing transistor Q1 and the second power transistor corresponding to the target load motor to be in the off state, so as to reverse the target load motor.

10. The DC motor multiplexing control method according to claim 9, characterized in that: The method further comprises: A second driving signal is sent to the chopping voltage regulating module of the DC motor multiplexing control circuit, so that the chopping voltage regulating module adjusts the output voltage or current of the DC motor multiplexing control circuit according to the second driving signal.

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