Motor driving circuit and control system

Abstract

The utility model provides a motor driving circuit and a control system. The motor driving circuit comprises a driving circuit; the driving circuit is connected with a first power supply VCC as a working power supply; a timing management circuit; the first end of the time sequence management circuit is connected to a first power supply VCC, and the second end outputs a second power supply VDD; a logic conversion circuit; the logic conversion circuit is connected with the second end of the time sequence management circuit so as to be connected with a second power supply VDD as a working power supply; the logic conversion circuit is connected with the driving circuit so as to process the received motor Hall signal and output six paths of driving signals to the driving circuit; a three-phase bridge circuit; and the three-phase bridge circuit is connected with the driving circuit so as to receive the driving signal amplified by the driving circuit, perform power conversion and output the driving signal to a motor to drive the motor to work. According to the motor driving circuit provided by the invention, a time sequence management function of internal power supply can be realized, and the problem that a motor cannot be normally started due to power-on time sequence variation is effectively solved.

Description

Technical Field

[0001] The present application relates to the field of motor drive control, and in particular to a motor drive circuit and control system. Background Art

[0002] The three-phase brushless motor driver is mainly composed of a logic conversion circuit, a drive circuit and a three-phase bridge circuit. The main function of the logic conversion circuit is to process the three-way Hall signal of the motor and output six-way drive signals; the main function of the drive circuit is to amplify the six-way drive signals and drive the three-phase bridge circuit; the main function of the three-phase bridge circuit is to perform power conversion according to the drive signal.

[0003] A commonly used driver solution is that the logic conversion circuit uses CD4000 series logic gates, the drive circuit uses IR2113, and the three-phase bridge circuit uses six N-channel MOS tubes. The current driver solution has internal circuit timing problems, that is, the start-up sequence of the logic conversion circuit and the drive circuit changes when powered on, which may cause the motor to not work properly when powered on. Summary of the invention

[0004] In order to solve the above problems, the present application provides a motor drive circuit that can implement the timing management function of the internal power supply, and effectively solve the problem that the motor cannot start normally due to changes in the power-on timing.

[0005] In order to achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] A motor drive circuit, comprising:

[0007] Driving circuit; the driving circuit is connected to a first power supply VCC as a working power supply;

[0008] Timing management circuit; the first end of the timing management circuit is connected to the first power supply VCC, and the second end outputs the second power supply VDD;

[0009] A logic conversion circuit; the logic conversion circuit is connected to the second end of the timing management circuit to access the second power supply VDD as a working power supply; the logic conversion circuit is connected to the drive circuit to output a drive signal to the drive circuit;

[0010] A three-phase bridge circuit; the three-phase bridge circuit is connected to the drive circuit to receive the drive signal amplified by the drive circuit and perform power conversion.

[0011] Furthermore, the timing management circuit includes:

[0012] Switch branch; the switch branch is provided with a first end, a second end and a control end; the first end of the switch branch is connected to a first power supply VCC, and the second end outputs a second power supply VDD;

[0013] A first control branch; the first control branch is connected to the control end of the switch branch;

[0014] A second control branch; the second control branch is connected to the first control branch; the second control branch is connected to the first end of the switch branch;

[0015] Delay branch; the delay branch is connected to the second end of the switch branch.

[0016] Furthermore, the switch branch includes a transistor Q2; the emitter of the transistor Q2 serves as the first end of the switch branch, the collector serves as the second end of the switch branch, and the base serves as the control end of the switch branch.

[0017] Furthermore, the first control branch includes a resistor R4, a resistor R3, a resistor R2 and a transistor Q1; the first end of the resistor R4 is connected to the first end of the switch branch; the second end of the resistor R4 is connected to the first end of the resistor R3 and then connected to the control end of the switch branch; the second end of the resistor R3 is connected to the collector of the transistor Q1; the emitter of the transistor Q1 is grounded, and the base is connected to the first end of the resistor R2; the second end of the resistor R2 is connected to the second control branch.

[0018] Furthermore, the second control branch includes a voltage regulator tube D1 and a resistor R1; the cathode of the voltage regulator tube D1 is connected to the first end of the switch branch; the anode of the voltage regulator tube D1 is connected to the first end of the resistor R1 and then connected to the second end of the resistor R2; the second end of the resistor R1 is grounded.

[0019] Furthermore, the delay branch includes a capacitor C1; a first end of the capacitor C1 is connected to a second end of the switch branch; and a second end of the capacitor C1 is grounded.

[0020] A motor control system comprises the motor driving circuit as described above.

[0021] Beneficial effects:

[0022] 1. It can realize the timing management function of the internal power supply, effectively solving the problem of the motor not being able to start normally due to changes in the power-on timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a motor drive circuit;

[0024] Figure 2 It is a structural diagram of the timing management circuit. DETAILED DESCRIPTION

[0025] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0026] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0027] Embodiment 1

[0028] like Figure 1 The figure shows a schematic diagram of the structure of a motor drive circuit, including:

[0029] Driving circuit; the driving circuit is connected to the first power supply VCC as a working power supply; the driving circuit is a driving circuit based on the IR2113 driving chip, and is used to amplify the driving signal;

[0030] Timing management circuit; the first end of the timing management circuit is connected to the first power supply VCC, and the second end outputs the second power supply VDD; the timing management circuit is used to have an undervoltage protection function, and is used to determine whether to input the second power supply VDD according to the size of the first power supply VCC;

[0031] A logic conversion circuit; the logic conversion circuit is connected to the second end of the timing management circuit to access the second power supply VDD as a working power supply; the logic conversion circuit is connected to the drive circuit to process the received motor Hall signal and output six drive signals to the drive circuit;

[0032] A three-phase bridge circuit; the three-phase bridge circuit is connected to the drive circuit to receive the drive signal amplified by the drive circuit and perform power conversion, and output it to the motor to drive the motor to work.

[0033] The present application provides a motor drive circuit, which can realize the timing management function of the internal power supply, and effectively solve the problem that the motor cannot start normally due to the change of the power-on timing. First, the second power supply VDD of the power supply of the logic conversion circuit is isolated from the first power supply VCC of the power supply of the drive circuit, and then an undervoltage protection function (that is, the function of the timing management circuit) is added to the logic conversion circuit, and the undervoltage point of the timing management circuit is set above the undervoltage point of the drive circuit IR2113 chip, so that in the process of the first power supply VCC boosting, when the IR2113 chip undervoltage point is reached, the drive circuit starts running first, and then the first power supply VCC continues to boost to reach the undervoltage point of the timing management circuit. When the timing management circuit outputs the second power supply VDD to the logic conversion circuit, the logic conversion circuit starts running. After the logic conversion circuit is turned on, the received motor Hall signal is processed, six drive signals are output to the drive circuit, and amplified by the already turned on drive circuit, the three-phase bridge circuit is controlled to complete the power conversion, and the motor is driven to work, then the motor can start normally.

[0034] In a specific implementation, the timing management circuit includes: a switch branch; the switch branch is provided with a first end, a second end and a control end; the first end of the switch branch is connected to the first power supply VCC, and the second end is used as the output end of the second power supply VDD. A first control branch; the first control branch is connected to the control end of the switch branch to control the opening or closing of the switch branch. A second control branch; the second control branch is connected to the first control branch; the second control branch is connected to the first end of the switch branch; the second control branch sends a control signal to the first control branch according to the voltage of the first power supply VCC, and then the first control branch controls the switch branch to be opened or closed. A delay branch; the delay branch is connected to the second end of the switch branch, and is used to further delay the rise of the voltage when the second end of the switch branch outputs the second power supply VDD.

[0035] In a specific implementation, the switch branch includes a transistor Q2; the emitter of the transistor Q2 serves as the first end of the switch branch, the collector serves as the second end of the switch branch, and the base serves as the control end of the switch branch. After the transistor Q2 is turned on, the first power supply VCC is output through the transistor Q2 to become the second power supply VDD.

[0036] In a specific implementation, the second control branch includes a voltage regulator tube D1 and a resistor R1; the cathode of the voltage regulator tube D1 is connected to the first end of the switch branch; the anode of the voltage regulator tube D1 is connected to the first end of the resistor R1 and then to the second end of the resistor R2; the second end of the resistor R1 is grounded.

[0037] In a specific implementation, the first control branch includes a resistor R4, a resistor R3, a resistor R2 and a transistor Q1; the first end of the resistor R4 is connected to the first end of the switch branch; the second end of the resistor R4 is connected to the first end of the resistor R3 and then connected to the control end of the switch branch; the second end of the resistor R3 is connected to the collector of the transistor Q1; the emitter of the transistor Q1 is grounded, and the base is connected to the first end of the resistor R2; the second end of the resistor R2 is connected to the second control branch.

[0038] In a specific implementation, the delay branch includes a capacitor C1; a first end of the capacitor C1 is connected to a second end of the switch branch; and a second end of the capacitor C1 is grounded.

[0039] When the circuit starts, the voltage of the first power supply VCC rises. When the voltage rises to a value greater than the undervoltage point of the IR2113 driver chip, the driver power starts to run; when the voltage continues to rise to a value greater than the voltage regulator D1, the voltage regulator is turned on, the first power supply VCC continues to rise, and the BE junction of the transistor Q1 is turned on; after the transistor Q1 is turned on, current will flow through the resistor R4, the resistor R3 and the transistor Q1, and a voltage drop will be generated on the resistor R4. This voltage drop causes the EB junction of the transistor Q2 to turn on. After the transistor Q2 is turned on, the capacitor C1 is charged, and the voltage of the second power supply VDD rises accordingly, and finally the function of sequential management of the power supply of the logic conversion circuit and the driver circuit is realized. The undervoltage point of the timing management circuit is mainly determined by the voltage regulator D1.

[0040] In the specific implementation, since the driving circuit, the logic conversion circuit, and the three-phase bridge circuit are existing mature technologies, the specific circuit structure will not be described in detail in this application.

[0041] Embodiment 2

[0042] A motor control system comprises the motor driving circuit as described above.

[0043] The present application provides a motor drive circuit, including: a drive circuit; the drive circuit is connected to a first power supply VCC as a working power supply; a timing management circuit; the first end of the timing management circuit is connected to the first power supply VCC, and the second end outputs the second power supply VDD; the timing management circuit is used to have an undervoltage protection function, and is used to determine whether to input the second power supply VDD according to the size of the first power supply VCC; a logic conversion circuit; the logic conversion circuit is connected to the second end of the timing management circuit to connect the second power supply VDD as a working power supply; the logic conversion circuit is connected to the drive circuit to process the received motor Hall signal and output six drive signals to the drive circuit; a three-phase bridge circuit; the three-phase bridge circuit is connected to the drive circuit to receive the drive signal amplified by the drive circuit and perform power conversion, and output it to the motor to drive the motor to work. The present application provides a motor drive circuit, which can realize the timing management function of the internal power supply, and effectively solve the problem that the motor cannot start normally due to the change of the power-on timing.

[0044] In the description of the present invention, it should be understood that the terms "middle", "length", "up", "down", "front", "back", "vertical", "horizontal", "inside", "outside", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In the present invention, unless otherwise clearly specified and limited, the first feature "on" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The above is only for explaining the implementation mode of the utility model and is not used to limit the utility model. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the utility model without creative work should be included in the protection scope of the utility model.

Claims

1. A motor drive circuit, characterized in that: include: Driving circuit; The driving circuit is connected to a first power source VCC as a working power source; Timing management circuit; The first end of the timing management circuit is connected to the first power supply VCC, and the second end outputs the second power supply VDD; A logic conversion circuit; the logic conversion circuit is connected to the second end of the timing management circuit to access the second power supply VDD as a working power supply; the logic conversion circuit is connected to the drive circuit to output a drive signal to the drive circuit; A three-phase bridge circuit; the three-phase bridge circuit is connected to the drive circuit to receive the drive signal amplified by the drive circuit and perform power conversion.

2. The motor drive circuit according to claim 1, characterized in that: The timing management circuit comprises: Switch branch; the switch branch is provided with a first end, a second end and a control end; the first end of the switch branch is connected to a first power supply VCC, and the second end outputs a second power supply VDD; A first control branch; the first control branch is connected to the control end of the switch branch; A second control branch; the second control branch is connected to the first control branch; the second control branch is connected to the first end of the switch branch; Delay branch; the delay branch is connected to the second end of the switch branch.

3. The motor drive circuit according to claim 2, characterized in that: The switch branch includes a transistor Q2; the emitter of the transistor Q2 serves as the first end of the switch branch, the collector serves as the second end of the switch branch, and the base serves as the control end of the switch branch.

4. The motor drive circuit according to claim 2, characterized in that: The first control branch includes a resistor R4, a resistor R3, a resistor R2 and a transistor Q1; the first end of the resistor R4 is connected to the first end of the switch branch; the second end of the resistor R4 is connected to the first end of the resistor R3 and then connected to the control end of the switch branch; the second end of the resistor R3 is connected to the collector of the transistor Q1; the emitter of the transistor Q1 is grounded, and the base is connected to the first end of the resistor R2; the second end of the resistor R2 is connected to the second control branch.

5. The motor drive circuit according to claim 4, characterized in that: The second control branch includes a voltage regulator tube D1 and a resistor R1; the cathode of the voltage regulator tube D1 is connected to the first end of the switch branch; the anode of the voltage regulator tube D1 is connected to the first end of the resistor R1 and then to the second end of the resistor R2; the second end of the resistor R1 is grounded.

6. The motor drive circuit according to claim 2, characterized in that: The delay branch includes a capacitor C1; a first end of the capacitor C1 is connected to a second end of the switch branch; and a second end of the capacitor C1 is grounded.

7. A motor control system, characterized in that: The motor driving circuit comprises the motor driving circuit as claimed in any one of claims 1 to 6.

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