Split motor processing circuit

Abstract

The invention discloses a split type motor processing circuit in the technical field of integrated circuits, the split type motor processing circuit is applied to a linear motor, the split type motor processing circuit comprises a signal processing unit and a power driving unit, and the signal processing unit is used for obtaining a feedback signal of the linear motor and calculating and generating an SPWM wave signal through a corresponding PID control algorithm; the power driving unit is used for acquiring the SPWM wave signal and converting the SPWM wave signal into a sine wave signal for driving the linear motor; the power driving unit comprises a three-phase bridge driver, an H-bridge circuit and an inverter circuit; the three-phase bridge driver controls the on-off of the H-bridge circuit according to the acquired SPWM wave signal, and the inverter circuit is used for inverting an output signal of the H-bridge circuit to generate a sine wave signal. Closed-loop feedback control is performed on the linear motor by adopting the signal processing unit and the power driving unit, and the linear motor has a speed regulation function and power driving. The circuit structure is simple, the function units are clear, the number of components is small, and circuit miniaturization is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to a split motor processing circuit. Background Art

[0002] Linear motor, also known as linear motor, is a motor that can generate linear motion. Linear motor can convert electrical energy into mechanical energy of linear motion without any intermediate transmission conversion device. Therefore, it is more efficient than the linear motion formed by the conversion device of the rotary motor. Existing linear motors are often used for laser cutting, CNC machining or for lifting goods. The control method of linear motor is mainly to adjust the duty cycle of the SPWM wave and the intensity of the motor drive, and it has speed regulation function and power drive. Existing drive circuits are often complex in structure, which is not conducive to miniaturization application. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a split motor processing circuit to solve the technical problem that the existing drive circuit has a complex structure and is not conducive to miniaturization application.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions: The present invention provides a split motor processing circuit, which is applied to a linear motor and includes a signal processing unit and a power driving unit. The signal processing unit is used to obtain a feedback signal of the linear motor and calculate and generate an SPWM wave signal through a corresponding PID control algorithm; the power driving unit is used to obtain the SPWM wave signal and convert it into a sinusoidal wave signal for driving the linear motor; the power driving unit includes a three-phase bridge driver, an H-bridge circuit and an inverter circuit; the three-phase bridge driver controls the on-off of the H-bridge circuit according to the obtained SPWM wave signal, and the inverter circuit is used to invert the output signal of the H-bridge circuit to generate a sinusoidal wave signal.

[0005] Optionally, the signal processing unit adopts an MCU chip or a DSP chip.

[0006] Optionally, a sensor component is provided on the linear motor, and the sensor component is used to collect a working status signal of the linear motor and use it as a feedback signal.

[0007] Optionally, the H-bridge circuit includes a MOS tube V1, a MOS tube V2, a MOS tube V3 and a MOS tube V4, the gates of the MOS tube V1, the MOS tube V2, the MOS tube V3 and the MOS tube V4 are all connected to the control end of the three-phase bridge driver, the source of the MOS tube V1 and the MOS tube V3 are connected and grounded, the drain of the MOS tube V2 and the MOS tube V4 are connected and connected to a power supply VDC, the drain of the MOS tube V1 and the source of the MOS tube V2 are connected and serve as the first output end of the H-bridge circuit; the drain of the MOS tube V3 and the source of the MOS tube V4 are connected and serve as the second output end of the H-bridge circuit.

[0008] Optionally, the inverter circuit includes a common-mode inductor L1, a common-mode inductor L2, a capacitor C1, a capacitor C2 and a capacitor C3; one end of the common-mode inductor L1 and the common-mode inductor L2 are respectively connected to the first output end and the second output end of the H-bridge circuit, and the other ends of the common-mode inductor L1 and the common-mode inductor L2 serve as the first output end and the second output end of the inverter circuit respectively; the first output end and the second output end of the inverter circuit are connected through the capacitor C1; the first output end and the second output end of the inverter circuit are grounded through the capacitor C2 and the capacitor C3 respectively.

[0009] Optionally, the output end of the inverter circuit is also connected to a bandpass filter.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a split motor processing circuit, which uses a signal processing unit and a power drive unit to perform closed-loop feedback control on a linear motor, and has a speed regulation function and power drive. The signal processing unit and the power drive unit are formed by general devices, and the circuit structure is simple and the functional units are clear. The motor speed can be changed by directly adjusting the SPWM wave duty cycle, and real-time adjustment can be achieved, and the adjustment is simple and fast. A small number of components are used, the circuit is small in size, light in weight, and low in cost, and the circuit is miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a structural diagram of a split motor processing circuit provided by an embodiment of the present invention; Figure 2 is a circuit diagram of a signal processing unit provided by an embodiment of the present invention; Figure 3 is a circuit diagram of a three-phase bridge driver and an H-bridge circuit provided by an embodiment of the present invention; Figure 4 is a circuit diagram of an inverter circuit provided by an embodiment of the present invention; Figure 5It is a waveform comparison diagram before and after filtering of the bandpass filter provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0013] Embodiment 1:

[0014] like Figure 1 As shown, the present invention provides a split motor processing circuit, which is applied to a linear motor, and includes a signal processing unit and a power drive unit. The signal processing unit is used to obtain the feedback signal of the linear motor and calculate and generate an SPWM wave signal through a corresponding PID control algorithm; the power drive unit is used to obtain the SPWM wave signal and convert it into a sinusoidal wave signal for driving the linear motor; the power drive unit includes a three-phase bridge driver, an H-bridge circuit and an inverter circuit; the three-phase bridge driver controls the on-off of the H-bridge circuit according to the obtained SPWM wave signal, and the inverter circuit is used to invert the output signal of the H-bridge circuit to generate a sinusoidal wave signal.

[0015] The signal processing unit uses an MCU chip or a DSP chip. Figure 2 As shown, this embodiment uses an MCU chip as a signal processing unit. The operating voltage range of the chip is 2.0V to 5.5V. The chip can recognize and calculate external feedback signals and provide input signals (SPWM waves) for the three-phase bridge driver.

[0016] Specifically in this embodiment, a sensor assembly is provided on the linear motor, and the sensor assembly is used to collect the working state signal of the linear motor and use it as a feedback signal. The sensor assembly includes but is not limited to a Hall sensor, a photoelectric encoder, a temperature sensor, a pressure sensor, and a magnetic field sensor, which can collect phase current signals, speed signals, temperature signals, pressure signals, and magnetic field signals respectively, and send them to the signal processing unit as feedback signals.

[0017] like Figure 3 As shown, the H-bridge circuit includes a MOS tube V1, a MOS tube V2, a MOS tube V3 and a MOS tube V4. The gates of the MOS tubes V1, V2, V3 and V4 are all connected to the control end of the three-phase bridge driver N2. The sources of the MOS tubes V1 and V3 are connected and grounded. The drains of the MOS tubes V2 and V4 are connected and connected to the power supply VDC. The drain of the MOS tube V1 is connected to the source of the MOS tube V2 and serves as the first output end of the H-bridge circuit; the drain of the MOS tube V3 is connected to the source of the MOS tube V4 and serves as the second output end of the H-bridge circuit.

[0018] The turn-on sequence of the MOS tube can be GHA, GLB as a group → GHB, GLA as a group, but it must not be turned on as GHA, GLA or GHB, GLB. Therefore, the staggered response time of the MOS tube in closing and opening is taken into account, otherwise when the upper arm (or lower arm) is not completely closed, the lower arm (or upper arm) is already turned on, resulting in a short circuit between the upper and lower arms and burning of the MOS tube. The dead time of this circuit is set to 450ns by the three-phase bridge driver N2, which effectively avoids the staggered conduction of GHA, GLA or GHB, GLB.

[0019] like Figure 4 As shown, the inverter circuit includes a common-mode inductor L1, a common-mode inductor L2, a capacitor C1, a capacitor C2 and a capacitor C3; one end of the common-mode inductor L1 and the common-mode inductor L2 are respectively connected to the first output end and the second output end of the H-bridge circuit, and the other ends of the common-mode inductor L1 and the common-mode inductor L2 serve as the first output end and the second output end of the inverter circuit respectively; the first output end and the second output end of the inverter circuit are connected through the capacitor C1; the first output end and the second output end of the inverter circuit are grounded through the capacitor C2 and the capacitor C3 respectively.

[0020] The output end of the inverter circuit is also connected to a bandpass filter. A bandpass filter is a filter that allows signals within a specific frequency range to pass through while suppressing signals below and above the frequency range. Specifically in this embodiment, the bandpass filter is based on the low-frequency fundamental wave and high-frequency carrier frequency of the driving sine wave signal, according to the formula , a bandpass filter composed of a specific capacitor C and inductor L. Figure 5 As shown, (a) is the sine wave signal before filtering, and (b) is the sine wave signal after filtering. The bandpass filter can make the sine wave signal smoother when passing through the zero point, thereby reducing the current fluctuation when the motor is running and improving the overall efficiency.

[0021] In summary, this embodiment has the following features: 1) It is composed of common devices such as MCU chip, three-phase bridge driver, MOS tube, capacitor and resistor, with simple circuit structure and clear functional units.

[0022] 2) By collecting the feedback signal of the motor and calculating it through the single-chip computer, the SPWM wave duty cycle is adjusted to change the motor speed. At the same time, by collecting the drive output current, the current limiting protection function is achieved, which can achieve real-time adjustment, fast and accurate adjustment.

[0023] 3) Filter the sinusoidal wave signal driving the linear motor to make the sinusoidal wave smoother when crossing the zero point, thereby reducing the current fluctuation when the motor is running and improving the overall efficiency.

[0024] 4) All components used are general components, with a small number, small circuit size, light weight and low cost, thus realizing circuit miniaturization.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A split motor processing circuit, applied to a linear motor, characterized in that: It includes a signal processing unit and a power driving unit. The signal processing unit is used to obtain the feedback signal of the linear motor and calculate and generate an SPWM wave signal through a corresponding PID control algorithm; the power driving unit is used to obtain the SPWM wave signal and convert it into a sine wave signal for driving the linear motor; the power driving unit includes a three-phase bridge driver, an H-bridge circuit and an inverter circuit; the three-phase bridge driver controls the on-off of the H-bridge circuit according to the obtained SPWM wave signal, and the inverter circuit is used to invert the output signal of the H-bridge circuit to generate a sine wave signal.

2. The split motor processing circuit according to claim 1, characterized in that: The signal processing unit adopts an MCU chip or a DSP chip.

3. The split motor processing circuit according to claim 1, characterized in that: The linear motor is provided with a sensor component, and the sensor component is used to collect the working state signal of the linear motor and use it as a feedback signal.

4. The split motor processing circuit according to claim 1, characterized in that: The H-bridge circuit includes a MOS tube V1, a MOS tube V2, a MOS tube V3 and a MOS tube V4. The gates of the MOS tube V1, the MOS tube V2, the MOS tube V3 and the MOS tube V4 are all connected to the control end of the three-phase bridge driver. The sources of the MOS tube V1 and the MOS tube V3 are connected and grounded. The drains of the MOS tube V2 and the MOS tube V4 are connected and connected to a power supply VDC. The drain of the MOS tube V1 and the source of the MOS tube V2 are connected and serve as the first output end of the H-bridge circuit; the drain of the MOS tube V3 and the source of the MOS tube V4 are connected and serve as the second output end of the H-bridge circuit.

5. The split motor processing circuit according to claim 1, characterized in that: The inverter circuit includes a common-mode inductor L1, a common-mode inductor L2, a capacitor C1, a capacitor C2 and a capacitor C3; one end of the common-mode inductor L1 and the common-mode inductor L2 are respectively connected to the first output end and the second output end of the H-bridge circuit, and the other ends of the common-mode inductor L1 and the common-mode inductor L2 serve as the first output end and the second output end of the inverter circuit respectively; the first output end and the second output end of the inverter circuit are connected through the capacitor C1; the first output end and the second output end of the inverter circuit are grounded through the capacitor C2 and the capacitor C3 respectively.

6. The split motor processing circuit according to claim 1, characterized in that: The output end of the inverter circuit is also connected to a bandpass filter.

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