TWI420800B - Mcu-less motor-driven module and the motor-control system thereof - Google Patents

Description

Motor drive module with adjustable output PWM control signal without micro control mode and motor control system thereof

The invention relates to a motor drive module with an adjustable motor speed, in particular to a motor drive module used in a micro-control mode, which is designed by an external circuit and a motor drive device. The PWM speed signal output by the driving device can be adjusted according to an external circuit.

Due to the diversified characteristics of consumer products, and in order to reduce the manufacturing cost of products, some consumer products without micro-control devices (Non-MCU), such as: hair dryers, microwave ovens, ovens, instruments or LED lighting devices, Micro-control devices are not configured; in addition, the heat dissipation requirements of these products are also different. Therefore, when a motor drive module is used in an operation mode without a micro control signal, since there is no micro control device to provide a PWM control signal relationship, this type of motor drive module cannot generate a control motor speed via a PWM signal. Therefore, this type of motor drive module can only drive the motor at a fixed speed to achieve heat dissipation.

In order to make these motor drive modules used in the micro-control mode can generate the required motor speed according to the heat dissipation requirements of the product, there are several ways to adjust the motor speed. The first one is to change the motor load, such as Figure 1A shows the second; the second is the mode of changing the operating voltage, as shown in Figure 1B. However, both methods have their application limitations. In the way of changing the motor load as shown in Figure 1A, this method has its winding limit when applied to some small-sized and low-load fans. . In the manner of changing the operating voltage as shown in Figure 1B, there is a minimum operating voltage limit and the complexity that the voltage must change for different applications. At present, the way to change the voltage is to connect a resistor in series with the load to meet different application requirements, as shown in Figure 1A. However, this method has a big disadvantage in that it increases power consumption and thus reduces the efficiency of the fan motor.

In order to solve the foregoing problems, one of the main purposes of the present invention is to disclose a circuit external to the motor drive module, whereby the design of the external circuit allows the motor drive module to generate different PWM output signals. In the absence of a micro-control device, the present invention can accommodate the application of different products to motor speed. In addition to improving the voltage and motor winding limitations, the efficiency of the motor is improved because no resistors are connected in series at the load end.

According to the above object, the present invention provides a motor drive module capable of adjusting an output PWM control signal. The motor drive module is composed of a motor drive device, a circuit formed outside the motor drive device, and a frequency adjustment circuit. The motor drive module is characterized in that: the motor driving device comprises a comparator having a first input end and a second input end, and the first input end thereof is connected in series with a pair of resistors, wherein the pair of resistors is One end is connected to a voltage, and the second end of the pair of resistors is connected to the ground point to generate a fixed voltage (Vrs) connected to the first input end of the comparator at one of the pair of resistors; a triangular wave generator, the output end of which is connected to the second input end of the comparator, and the input end thereof is connected to the capacitor; after the first input end of the comparator is compared with the second input end, a PWM control signal is outputted from the output end .

The invention further provides a motor control system, which is a motor drive module that can adjust the output PWM control signal, an output unit connected to the motor drive module, and a motor connected to the output unit, and the motor drive module includes a motor driving device, a voltage adjusting circuit formed outside the motor driving device, and a frequency adjusting circuit formed outside the motor driving device, wherein the motor control system is characterized in that the motor driving device comprises a comparator having a first An input end and a second input end, wherein the first input end is connected in series with the pair of resistors, wherein a first end of the pair of resistors is connected to a voltage, and a second end of the pair of resistors is connected to the ground point Generating a fixed voltage at one of the pair of resistors to be coupled to the first input of the comparator; a triangular wave generator having an output coupled to the second input of the comparator and having an input coupled to the capacitor; After comparing the first input end and the second input end of the comparator, a PWM control signal is outputted from the output end of the motor driving device, and the PWM control is performed The signal sent to the output unit to drive the rotation of the motor.

In order to clearly illustrate the operation of the motor drive module of the present invention, a single-phase motor will be described as an embodiment in the following description; however, the application of the present invention is not limited to the application of a single-phase motor. It can also be used in applications with multiphase motors. At the same time, the single-phase motor or the multi-phase motor to be driven by the motor drive module of the present invention is the same as the motor currently used, so in the following description, the driving mode of the single-phase motor or the multi-phase motor is not detailed. Description. In the following description, the motor driving device of the present invention is mainly disclosed in detail.

First, please refer to Figures 2A and 2B first, which are schematic diagrams of the motor driving device and voltage level adjustment of the present invention. As shown in FIG. 2A, the external voltage adjusting circuit may be a resistor pair R1/R2 connected in series with the motor driving device 10, wherein the first end of the resistor R1 is connected to a voltage, and the voltage may be a Hall voltage ( VHB); the second end of the resistor R1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the ground point (GND); and the second end of the resistor R1 is connected to the first end of the resistor R2. Connected to a pin of the motor drive unit 10; at this time, the function of R1/R2 is to provide a fixed voltage (Vrs) as an input signal to the motor drive unit 10. The VRS voltage level can be changed by adjusting the resistance values of the resistor R1 and the resistor R2 as shown in FIG. 2B. In addition, the motor driving device 10 further provides a CPWM pin and is connected to a capacitor Cv; the triangular wave can be generated by the charging and discharging function of the external capacitor Cv, so the frequency of the triangular wave can be adjusted by the external capacitor Cv.

Next, please refer to FIG. 3, which is a functional block diagram of the motor drive module of the present invention that can adjust the output PWM control signal. As shown in FIG. 3, the motor driving module of the present invention is composed of a motor driving device 10, a voltage adjusting circuit 20 formed outside the motor driving device 10, and an external frequency adjusting circuit 30 formed in the motor driving device 10. The motor driving device 10 includes: a comparator 11 having a first input terminal connected to a resistor R3 and a second input terminal connected to a triangular wave generator 13 for comparing the two input voltages through the comparator 11 11 outputs a PWM output voltage signal C _out from the output terminal; a PWM controller 15 whose input terminal is connected with the PWM output voltage C _out outputted from the output end of the comparator 11, and the PWM controller 15 can further convert the PWM output voltage signal C _{out is} converted into a voltage-adjusted (ie level-shift) PWM control signal to control a motor drive unit (not shown in this figure). In an embodiment of the present invention, the motor driving device 10 can be fabricated as a wafer having a plurality of pins, so that the resistor R3 can be used as a protection circuit for preventing electrostatic discharge (ESD), and a current limiting function; obviously, The motor driving device 10 of the present invention may also choose not to dispose the resistor R3. Meanwhile, in order to make the triangular wave generator 13 of the present invention have a function of adjusting the frequency of the triangular wave, an external frequency adjusting circuit 30 is further provided, and the additional frequency adjusting circuit 30 and the triangular wave generator 13 in the motor driving device 10 are provided. By connecting, the triangular frequency of the triangular wave generator 13 can be adjusted by the external frequency adjusting circuit 30. In addition, it should be emphasized that the PWM controller 15 in this embodiment has the most important purpose of performing voltage adjustment on the PWM output voltage C _out outputted by the comparator 11 to respond to different voltage systems; for example, converting a 3V signal into 5V or 12V output. The PWM controller 15 can also be omitted if the system does not need to adjust the voltage.

Next, please refer to FIG. 4, which is a schematic diagram of an embodiment of a motor drive module of the present invention that can adjust the output PWM control signal. As shown in FIG. 4, the connection mode of the comparator 11, the triangular wave generator 13, and the PWM controller 15 in the motor driving device 10 of this embodiment is the same as that of FIG. 3; in the present embodiment, the external circuit is further disclosed. And an embodiment of an external frequency adjustment circuit and an embodiment thereof.

Referring to FIG. 4, the external voltage adjusting circuit 20 may be a resistor pair R1/R2 connected in series with the motor driving device 10, wherein the first end of the resistor R1 is connected to a voltage, and the voltage may be a Hall voltage ( VHB); the second end of the resistor R1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the ground point (GND); and the second end of the resistor R1 is connected to the first end of the resistor R2. Connected to a pin of the motor driving device 10, and the pin is connected to the first input end of the comparator 11; the piezoelectric transformer formed by the resistance values of the resistor R1 and the resistor R2 according to different rotational speed requirements The circuit adjusts the VRS voltage level, wherein the Hall voltage connected to the first end of the resistor R1 may be disposed in the motor driving device 10, which may also be provided by a voltage source external to the motor driving device 10; In a preferred embodiment, the Hall voltage is configured in the motor In the drive device 10.

Next, the external frequency adjusting circuit 30 of the present embodiment is a capacitor Cv, which is connected to a pin formed by the input end of the triangular wave generator 13 in the motor driving device 10; therefore, the present embodiment can be used by a capacitor The capacitance value of Cv is selected to adjust the frequency of the triangular wave generated by the triangular wave generator 13.

After the resistance of the external voltage adjustment circuit 20 to the resistance value of R1/R2 and the Hall voltage connected to the resistor R1 have been designed and determined, the VRS voltage level of the first input terminal of the comparator 11 can be determined; When the capacitor Cv of the external frequency adjusting circuit 30 has also been designed and determined, the triangular wave generator 13 generates a triangular wave of a specific frequency (ie, a CPWM signal) according to the capacitance value of the capacitor Cv, and is calculated by the comparator 11 2 input input. Therefore, the comparator 11 in the motor driving device 10 of the present invention can be cut by the VRS voltage level input from the first terminal and the triangular wave generated by the triangular wave generator 13 to generate a PWM signal and is controlled by the comparator 11. Output output, as shown in Figure 5; for example, when the triangular wave of a specific frequency is determined, it can be cut by the VRS voltage level and the triangular wave. When the VRS voltage level is closer to the high level, the PWM signal is cut. The smaller the DUTY CYCLE is, the larger the DUTY CYCLE of the PWM signal is cut when the VRS voltage level is closer to the lower level. After the PWM signal cut by the PWM controller 15 is voltage-adjusted, a PWM control signal for controlling the motor speed can be output. Obviously, designed by the heat dissipation requirements of the product After the resistance value of the voltage adjustment circuit 20 and the capacitance value of the external frequency adjustment circuit 30, a specific PWM signal can be generated. Therefore, after the design of the external voltage adjusting circuit 20 and the external frequency adjusting circuit 30, the motor driving device 10 can also adjust the output PWM control signal of the motor driving device 10 without the PWM control signal provided by the micro control unit. To meet the cooling needs of each product. Similarly, it should be emphasized here that the PWM controller 15 in this embodiment has the most important purpose of level-shifting the PWM signal outputted by the comparator 11 to respond to different voltage systems; for example, converting a 3V signal into 5V or 12V output; therefore, the PWM controller 15 can be configured as needed.

According to the above, the external circuit of the motor drive module disclosed in the present invention is externally connected with a circuit, so that the design of the external circuit enables the motor drive module to generate different PWM output signals, so even without the micro control device. In this case, the invention can still be adapted to the application of different products to the motor speed. In addition to improving the voltage and motor winding restrictions, the motor drive module does not require a resistor in series at the load end, thereby improving the operating efficiency of the motor.

First, please refer to Fig. 6, which is a schematic diagram of the motor drive system of the present invention. As shown in FIG. 6, the motor drive system 1 includes a motor drive unit 10 and a single-phase motor 300 output unit 200. The motor drive unit 10 includes a comparator 11, a triangular wave generator 13, an external voltage adjustment circuit 20, and an external frequency. The adjustment circuit 30 is composed of. When the PWM control signal outputted by the motor driving device 10 is sent to the output unit 200, the output voltage of the output circuit 210 and the output circuit 220 is controlled to be supplied to the motor 300 by a driving voltage formed by the DUTY CYCLE of the PWM control signal output (for example, a single type) The coil on the phase motor is rotated by the drive motor 300. Next, the Hall element 310 on the motor 300 sends the commutation signal of the motor 300 to the output unit 200 to determine whether the motor 300 is continuously rotating. When it is determined that the motor 300 has been continuously rotated, the PWM control signal outputted by the motor driving device 10 is continuously sent to the output unit 200. It is to be noted that the PWM control signal provided by the motor driving device 10 in the motor drive system 1 is the same as that of the embodiment of FIG. 4 and will not be described herein.

It is to be noted that the above embodiments are an embodiment of the present invention. Obviously, the present invention can also be used to fabricate the external capacitor Cv in the above embodiment, which can also achieve the adjustment of the motor driving device 10. The PWM control signal that is output. Furthermore, the present invention does not limit that R1 and R2 must be connected to the VHB terminal; the same effect can be achieved when R1 and R2 are connected to the internal power supply of the chip or to the power supply circuit thereof.

In addition, the PWM control signal outputted by the motor driving device 10 of the present invention can be used to control a three-phase motor in addition to driving the single-phase motor 300; when the motor driving device 10 of the present invention is used to control a three-phase horse When the time is up, the PWM control signal outputted by the motor driving device 10 can also be sent to the U/V/W coil on the three-phase motor (not shown in the figure). It is used to drive the rotation of the three-phase motor; since the construction of the three-phase motor is the same as the conventional technology, it will not be described again.

The above description of the preferred embodiments of the present invention is intended to be illustrative, and is not intended to limit the precise form of the invention. It is possible to make certain modifications from the above teachings or the embodiments of the invention. Therefore, the technical idea of the present invention will be determined by the following claims and their equals.

10‧‧‧Motor drive

11‧‧‧ Comparator

13‧‧‧ Triangle Wave Generator

15‧‧‧PWM controller

17‧‧‧ Hall voltage

20‧‧‧External voltage adjustment circuit

30‧‧‧External frequency adjustment circuit

200‧‧‧Output unit

210/220‧‧‧Output circuit

300‧‧‧Motor

1A is a schematic diagram of a motor driving device for changing a motor load in the prior art; FIG. 1B is a schematic diagram of a motor driving device for changing a working voltage in a prior art; FIGS. 2A and 2B are a motor driving of the present invention. Schematic diagram of the device and the voltage level adjustment; FIG. 3 is a functional block diagram of the motor drive module of the adjustable output PWM control signal of the present invention; FIG. 4 is a motor drive module of the adjustable output PWM control signal of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a schematic diagram of an output signal of a motor driving device of the present invention; and FIG. 6 is a schematic diagram of a single-phase motor for controlling a motor driving system of the present invention.

10‧‧‧Motor drive

11‧‧‧ Comparator

13‧‧‧ Triangle Wave Generator

15‧‧‧PWM controller

17‧‧‧ Hall voltage

20‧‧‧External voltage adjustment circuit

30‧‧‧External frequency adjustment circuit

Claims (10)

A motor drive module capable of adjusting an output PWM control signal without a micro control mode, the motor drive module being composed of a motor drive device, a circuit formed outside the motor drive device, and a frequency adjustment circuit, the motor The driving module is characterized in that: the motor driving device comprises a comparator having a first input end and a second input end, and the first input end is connected to the external circuit, and the external circuit is a pair of resistors Connected to the motor driving device in series, wherein a first end of the pair of resistors is connected to a voltage, and a second end of the pair of resistors is connected to a ground point, and one of the pair of resistors is intermediate with the comparator The first input terminal is connected to provide a first voltage; a triangular wave generator has an output end connected to the second input end of the comparator, and an input end is connected to the frequency adjustment circuit for outputting a triangular wave signal to the second input end of the comparator; and after comparing the first voltage with the triangular wave signal by the comparator, one output of the comparator is connected to a PWM control And outputting, by the PWM controller, a voltage-adjusted PWM control signal, wherein when the first voltage is closer to a high level, a duty cycle of the PWM control signal is smaller, and the closer to the first voltage is When the low level is on time, the duty cycle of the PWM control signal is larger. The motor drive module of the adjustable output PWM control signal without the micro control mode according to the first aspect of the patent application, wherein the motor drive device is a wafer. The motor drive module of the adjustable output PWM control signal without the micro control mode according to the first aspect of the patent application, wherein the frequency adjustment circuit is a capacitor. A motor control system without micro control mode is a motor drive module with an adjustable output PWM control signal without a micro control mode, an output unit connected to the motor drive module, and a motor connected to the output unit Composed of The motor drive module includes a motor drive device, a circuit formed outside the motor drive device, and a frequency adjustment circuit. The motor control system is characterized in that the motor drive device includes a comparator having a first input. And a second input end connected to the external circuit, wherein the external circuit is a pair of resistors connected in series with the motor driving device, wherein the first end of the pair of resistors is connected to a voltage, And a second end of the pair of resistors is connected to the ground point, and one of the pair of resistors is connected to the first input end of the comparator for providing a first voltage; a triangular wave generator, the output end of which is The second input end of the comparator is connected, and the input end is connected to the frequency adjustment circuit for outputting a triangular wave signal to the second input end of the comparator; the first voltage and the triangular wave signal are used by the comparator After the comparison, a PWM control signal is outputted from the output end of the comparator, wherein when the first voltage is closer to a high level, the duty cycle of the PWM control signal is smaller, when The closer the voltage is to a low level, the greater the duty cycle of the PWM control signal; and after the first input of the comparator is compared with the second input, an output is coupled to a PWM controller, and The PWM controller outputs a voltage-adjusted PWM control signal, and sends the PWM control signal to the output unit to drive the motor to rotate. A motor control system without micro control mode according to claim 4, wherein the motor driving device is a wafer. A motor control system without micro control mode according to claim 5, wherein the voltage connected to the first end of the pair of resistors is a Hall voltage disposed in the wafer. A motor control system without micro control mode according to claim 6 of the patent application, wherein the motor is a single phase motor. Motor control system without micro control mode according to item 7 of the patent application scope The motor is a three-phase motor. A motor control system without micro control mode according to claim 4, wherein the frequency adjustment circuit is a capacitor. A motor control system without micro control mode according to claim 4, wherein the frequency adjustment circuit is formed outside the motor drive unit.