TWI674744B - Four-External-Wire Motor Control System and Data Setting Method and Wirings Therefor - Google Patents

Abstract

The invention proposes a motor control system, which has only and exactly four lines to the outside: a power source positive line, a power source negative line, a PWM speed control input line, and a speed detection output line, wherein the power source positive line and the power source negative line are used for Provide motor control system positive and negative voltage; PWM speed control input circuit is used to transmit a PWM speed control signal to control a motor speed during a motor control phase; speed detection output circuit is used to transmit the detected externally during this motor control phase. To the motor speed; among which, the PWM speed control input line is suitable for transmitting data from a data setting source to the inside of the motor control system in a single-line signal transmission mode.

Description

External four-line motor control system and data recording method and circuit thereof

The invention relates to a data burning method for a motor control system, and in particular, it only requires four wires, and when the motor controller chip is already installed on the motor control system, the parameter data can be directly set without disassembly. Data burning method of the motor control system.

The motor control system has a variety of uses, such as to control the speed of the fan. In a four-wire PWM (Pulse Width Modulation) motor speed control system, only four external pins (corresponding to four lines) can be used, two of which are the positive and negative poles of the power supply, and the other is PWM speed control input pin (this is a unidirectional input pin), one pin is a speed detection output pin (this is a unidirectional output pin); in the prior art, when the motor controller chip has been installed in the motor After controlling the system, these four lines / pins cannot be used to set the internal parameter data of the system. If you want to set the parameter data of the system from the outside, there are only a few methods available in the prior art: one is to set the parameter data of the motor controller chip before the motor controller chip is installed in the motor control system Controller chip has other exposed feet available); Second, after the motor controller chip has been installed on the motor control system, remove the motor controller chip from the motor control system to set the parameter data (same reason as above); After the motor controller chip has been installed on the motor control system, the system is disassembled, and the other pins of the motor controller chip are connected to the data writer to set the parameter data (the reason is the same as above). In addition, the overall structure must be changed to use a five-wire or more structure. Only after the motor controller chip has been installed on the motor control system, the internal programming of the in-system programming (ISP) Parameter data. For example, currently known communication interface protocols include UART, I2C, JTAG, etc. Among them, UART requires one input and one output line; I2C requires two bidirectional input / output lines; JTAG requires four lines. In other words, if these communication interface protocols are used, corresponding lines must be added. In the original four wires, the line used for the PWM speed control input cannot be used in conjunction with the above-mentioned various communication interface protocols, because the PWM speed control input line transmits the PWM signal, and its working ratio is modulated, and these The communication interface protocol requires that the lengths of the signal levels are approximately the same.

Obviously, the above methods are either very cumbersome, increase costs, or cause incompatible architectures. The present invention proposes a solution to the above problems.

According to one aspect, the present invention provides an external four-line motor control system for controlling a motor. The external four-line motor control system includes: a motor controller chip including a decoder; The power positive circuit, the power negative circuit, the PWM speed control input circuit, and the speed detection output circuit coupled to the motor controller chip, wherein the power positive circuit and the power negative circuit are used to provide the motor control system and the motor controller chip. Positive and negative voltage; the PWM speed control input line is used to transmit a PWM speed control signal to control the speed of the motor in a motor control phase; the speed detection output line is used to transmit the detected Motor speed; wherein the PWM speed control input line is coupled to the decoder, and the PWM speed control input line is suitable for transmitting data to the decoder from a data setting source in a single-line signal transmission mode; wherein the motor control The system only has these four lines to the outside, and in a parameter data setting stage, the data When the clock signal is not transmitted to the other line is set between the source and the motor controller wafer.

In a preferred embodiment, the PWM speed control input line is a bi-directional transmission line, and the motor controller chip further includes an encoder, and the data to be read is externally transmitted through the PWM speed control input line. Send.

In another aspect, the present invention provides a data burning method for an external four-wire motor control system, wherein the motor control system has only and exactly four external communication lines, including a power positive line, a power negative line, and PWM speed control. An input line and a speed detection output line, wherein the power positive line and the power negative line are used to provide positive and negative voltages of the motor control system; the PWM speed control input line is used to transmit a PWM speed control signal during a motor control phase, To control the speed of a motor; the speed detection output circuit is used to transmit the detected motor speed to the outside during the motor control phase, the method includes: in a parameter data setting phase, using a single-line signal transmission mode, from a data setting The source transmits data to the inside of the motor control system, and when transmitting the data, the clock signal is not transmitted between the data setting source and the motor control system through other lines.

In a preferred embodiment, the PWM speed control input line is a bi-directional transmission line, and in the parameter data setting stage, the internal data of the motor control system is read from the outside through the PWM speed control input line.

In another aspect, the present invention provides a circuit for an external four-wire motor control system, which has only and exactly four external communication lines, including: a power positive line and a power negative line, the power positive line and the power negative The circuit is used to provide positive and negative voltages of the motor control system. A PWM speed control input circuit is used to transmit a PWM speed control signal in a motor control stage to control a motor speed. A speed detection output circuit It is used to transmit the detected motor speed to the outside during the motor control stage. The PWM speed control input line is suitable for transmitting data from a data setting source to a data setting source in a parameter data setting stage. The motor control system is internal.

In one of the preferred implementation types, in the parameter data setting stage, the clock signal is not transmitted through other lines between the data setting source and the motor control system.

In one preferred embodiment, the PWM speed control input line is a bidirectional transmission line.

Detailed descriptions will be provided below through specific embodiments to make it easier to understand the purpose, technical content, features and effects of the present invention.

The drawings in the present invention are schematic, and are mainly intended to show the relationship between the components of each circuit. As for the shapes and dimensions, they are not drawn to scale.

Fig. 1 shows a first embodiment of the present invention. Referring to FIG. 1, in the present invention, the motor control system 10 includes a motor controller chip 12; the motor control system 10 has only four external lines, which are a power supply positive VDD, a power supply negative GND, a PWM speed control input line PWML, and a speed Detection output line TACH (referred to as FG in some products, TACH in the present invention). The motor control system 10 is used to control the motor M. The data setting source may be, but is not limited to, a writer. The other parts of the motor control system 10 are not relevant to the present invention, and are therefore omitted.

The positive power supply VDD and the negative power supply GND are used to provide the positive and negative voltages of the motor control system 10 and the motor controller chip 12; The PWM speed control input line PWML is used to transmit a PWM speed control signal during the motor control phase to control the speed of the motor; The detection output line TACH is used to transmit the detected motor speed to the outside during the motor control phase.

The difference between the present invention and the prior art is that in the present invention, the PWM speed control input line PWML is arranged as a single-line signal transmission line for setting parameter data in the system. Generally speaking, the transmission of data requires a clock, so usually two lines are needed to communicate between the sender and the receiver, one to pass the data and one to the clock. If the receiver does not know the clock, for example, a high-level signal with a length of one microsecond is a single digit if the clock frequency is 1 MHz, and is ten if the clock frequency is 10 MHz. Single digit 1111111111. However, in the present invention, in the parameter data setting stage, the data setting source communicates with the motor controller chip 12 only through the PWM speed control input line PWML in a single-line signal transmission mode, and does not transmit the clock signal through other lines. The "parameter data setting stage" may be when the motor controller chip 12 has been mounted on the motor control system 10, and of course, it may also be when the motor controller chip 12 has not been mounted on the motor control system 10.

Referring to FIG. 2, there are many ways of single-line signal transmission, which can be applied to the present invention; the present invention is not limited to any one of them, and this embodiment is merely an example. As shown in Figure 2, in this embodiment, the working ratio of the PWM signal can be used to define 1 and 0. For example, the time length of the high level is greater than the time length of the low level (working ratio> 50%) , It represents a binary 1 and when the length of the high level is less than the length of the low level (working ratio <50%), it represents a binary 0. Of course, the opposite definition is also possible.

Or, please refer to Fig. 3, it can be defined that when the working ratio is> 60%, it represents a binary 1; when the working ratio is <40%, it represents a binary 0; and when the working ratio is between 40% and 60% Time, indicating the start code and end code of the transmission.

Figure 4 shows an example: the signal transmitted according to the definition in Figure 3 has the meaning of 11010010, and includes the start code and the end code before and after.

It should be noted that, in the above definition, the cycle length of each digit does not have to be the same, only the relationship between the high and low levels (or the relationship between the high level and the period) can be met.

In addition to the above definitions, there can be many other definitions, and the present invention is not limited to any of them. For example, it can be defined that when the length of time of the high level is greater than the critical time is 1, and the time of less than the critical time is 0, the time of the low level needs to be longer than another critical time, and vice versa.

Returning to FIG. 1, the motor controller chip 12 includes a decoder 14. This decoder can decode the received signal according to the signal definition of the single-line signal transmission to set the internal parameter data of the system.

In a preferred embodiment, the PWM speed control input line PWML can be a bidirectional transmission line. On the one hand, parameter data can be set from the outside to the internal, and on the other hand, internal parameter data can be read to the outside. In this case, please refer to FIG. 5. The motor controller chip 12 may include an encoder 16, which encodes the data to be read according to the transmission definition, and then transmits it through the PWM speed control input line PWML.

The present invention has been described above with reference to the preferred embodiments, but the above is only for making those skilled in the art easily understand the content of the present invention, and is not intended to limit the scope of rights of the present invention. In the same spirit of the invention, those skilled in the art can think of various equivalent changes. For example, the definition of signal level can be interchanged; for example, two components or two circuits directly connected as shown in the circuit diagram of the embodiment can be interposed between components or circuits that do not affect the main function of the overall circuit, such as switches, buffers, Resistance, etc. The scope of the invention should cover the above and all other equivalent variations.

10‧‧‧Motor control system

12‧‧‧Motor controller chip

14‧‧‧ decoder

16‧‧‧ Encoder

M‧‧‧Motor

VDD‧‧‧ power positive

GND‧‧‧ Negative power

PWML‧‧‧PWM speed control input circuit

TACH‧‧‧Speed detection output circuit

Fig. 1 shows a first embodiment of the present invention. Figure 2-3 shows an example of the definition of single-line signal transmission. Figure 4 shows an example of the signal transmitted according to the definition in Figure 3. Fig. 5 shows a second embodiment of the present invention.

Claims (7)

An external four-wire motor control system for controlling a motor. The external four-wire motor control system includes: a motor controller chip including a decoder; and a power supply positive line externally coupled to the motor controller chip Power negative circuit, PWM speed control input circuit, and speed detection output circuit, wherein the power positive circuit and the power negative circuit are used to provide positive and negative voltages for the motor control system and the motor controller chip; the PWM speed control input circuit is used In a motor control stage, a PWM speed control signal is transmitted to control the motor speed; the speed detection output circuit is used to transmit the detected motor speed to the motor control stage; wherein, the PWM speed control input The circuit is coupled with the decoder, and the PWM speed control input circuit is suitable for transmitting binary data from a data setting source to the decoder in a single-line signal transmission mode; wherein, the motor control system is only externally and precisely There are four lines, and in a parameter data setting stage, the clock signal is not transmitted between the data setting source and the motor controller chip through other lines. The external four-wire motor control system as described in item 1 of the patent scope, wherein the PWM speed control input line is a bidirectional transmission line, and the motor controller chip also includes an encoder to read the desired data, External transmission is carried out through the PWM speed control input line. A data burning method for an external four-wire motor control system, wherein the motor control system has only and exactly four external communication lines, including a power supply positive line, a power supply negative line, a PWM speed control input line, and a speed detection output line, Wherein, the power supply positive line and the power supply negative line are used to provide positive and negative voltages of the motor control system; the PWM speed control input line is used to transmit a PWM speed control signal to control a motor speed during a motor control stage; the speed detection The output circuit is used to transmit the detected motor speed to the motor during the motor control phase. The method includes: transmitting the binary bit data from a data setting source to the motor in a parameter data setting phase using a single-line signal transmission method Inside the control system, and when transmitting the binary bit data, no clock signal is transmitted between the data setting source and the motor control system through other lines. The data burning method of the external four-wire motor control system as described in item 3 of the patent scope, wherein the PWM speed control input line is a bidirectional transmission line, and in the parameter data setting stage, the PWM speed control input is further used The circuit reads the internal data of the motor control system from the outside. A circuit for an external four-wire motor control system, which has only and exactly four external communication lines, including: a power supply positive circuit and a power supply negative circuit, the power supply positive circuit and the power supply negative circuit are used to provide positive and negative voltages of the motor control system A PWM speed control input circuit, the PWM speed control input circuit is used to transmit a PWM speed control signal to control a motor speed in a motor control stage; a speed detection output circuit is used to transmit externally in the motor control stage The detected motor speed, wherein the PWM speed control input circuit is suitable for transmitting binary data from a data setting source to the inside of the motor control system in a parameter data setting stage using a single-line signal transmission method. The circuit of the external four-wire motor control system as described in item 5 of the patent scope, wherein in the parameter data setting stage, the clock signal is not transmitted between the source of the data setting and the motor control system through other lines. The circuit of the external four-wire motor control system as described in item 5 of the patent application scope, wherein the PWM speed control input circuit is a bidirectional transmission line.