TWI749857B - Motor controller - Google Patents

Abstract

A motor controller is configured to obtain a plurality of physical parameters. The motor controller comprises a selecting circuit, a Hall signal processing unit, a temperature sensor, a transistor, a control unit, and a driving circuit. The Hall signal processing unit is configured to generate a Hall signal. The temperature sensor is configured to generate a temperature signal. The control unit comprises a judging unit and the judging unit is configured to determine whether the motor controller is operated in a normal operation mode or a test mode. The judging unit is used for informing the selecting circuit to output the temperature signal or the Hall signal based on a first test enabling signal or a second test enabling signal.

Description

Motor controller

The present invention relates to a motor controller, in particular to a motor controller that can obtain a plurality of physical parameters in a test mode.

At present, some motor controllers have built-in multiple sensing elements (such as Hall sensors, temperature sensors, etc.) for internal control signals. However, users cannot obtain the physical parameters output by these sensing elements through external measurements. In the conventional technology, a pulse width modulation (Pulse Width Modulation) pin can be used to receive a test start signal to enter the test mode, and a pulse width modulation pin can be used to output a Hall signal. Since the number of pins will affect the packaging cost, the number of pins will be minimized on the premise of cost saving to enhance the competitiveness of the product. Therefore, how to make good use of the existing pins to enter the test mode to obtain the required physical parameters is actually an important issue that needs to be solved at present.

In view of the foregoing problems, the purpose of the present invention is to provide a motor controller that can output multiple physical parameters in a test mode.

According to the present invention, the motor controller is provided. The motor controller is used to drive a motor. The motor controller has a command pin, a rotation speed signal pin, a selection circuit, a Hall signal processing unit, a temperature sensor, a transistor, a control unit, and a drive circuit. The choice of electricity The circuit is coupled to the speed signal pin. The driving circuit is used to provide a motor current to the motor. The Hall signal processing unit is used to generate a Hall signal. The temperature sensor is used to generate a temperature signal. The control unit has a judging unit and the judging unit is used to determine the motor controller to operate in a normal operation mode or a test mode. The judgment unit is coupled to the command pin. The judging unit is used for notifying the selection circuit to output a temperature signal via the rotation speed signal pin according to a first start test signal. The judging unit is used to notify the selection circuit to output a Hall signal via the rotation speed signal pin according to a second start test signal.

10: Motor controller

VCC: Voltage supply pin

GND: ground pin

OUT1: The first output pin

OUT2: The second output pin

SO: Speed signal pin

CMD: Command pin

L: Motor coil

110: select circuit

120: Hall signal processing unit

130: temperature sensor

140: Transistor

150: control unit

160: drive circuit

Vhb, Vm: voltage source

121: Hall sensor

122: Amplifier

IN1: the first input

IN2: second input

131: Double carrier transistor

CS: current source

151: Judgment Unit

Vh: Hall signal

Vb: Reference voltage

Vt: temperature signal

Vs: Speed signal

SEL: Digital signal

Vp: Pulse width modulation signal

Figure 1 is a pinout diagram of a motor controller according to an embodiment of the present invention.

Figure 2 is a schematic diagram of a motor controller according to an embodiment of the present invention.

The following description will make the purpose, features, and advantages of the present invention more obvious. The preferred embodiments according to the present invention will be described in detail with reference to the drawings.

Figure 1 is a pinout diagram of a motor controller 10 according to an embodiment of the present invention. The motor controller 10 is used to drive a motor, wherein the motor has a motor coil L. The motor controller 10 has a voltage supply pin VCC, a ground pin GND, a command pin CMD, a first output pin OUT1, a second output pin OUT2, and a speed signal pin SO. The voltage supply pin VCC and the ground pin GND are coupled to a voltage source Vm to supply the voltage required by the motor controller 10. The command pin CMD receives a pulse width modulation signal to adjust the speed of the motor. The speed signal pin SO is used to output a speed signal. The first output pin OUT1 and the second output pin OUT2 are coupled to the motor coil L to drive the motor.

Figure 2 is a schematic diagram of a motor controller 10 according to an embodiment of the present invention. The motor controller 10 further has a selection circuit 110, a Hall signal processing unit 120, a temperature sensor 130, a transistor 140, a control unit 150, and a driving circuit 160. The Hall signal processing unit 120 has a Hall sensor 121 and an amplifier 122, wherein the Hall sensor 121 is disposed near the motor to sense the change of the magnetic field of the motor. The Hall sensor 121 is coupled to a voltage source Vhb to generate a first output signal and a second output signal. The amplifier 122 has a first input terminal IN1 and a second input terminal IN2. The first input terminal IN1 is coupled to the first output signal and the second input terminal IN2 is coupled to the second output signal to generate a Hall signal Vh. To selection circuit 110. In addition, the Hall signal Vh is related to a physical parameter, such as a magnetic field.

The temperature sensor 130 has a dual carrier transistor 131 and a current source CS. The bi-carrier transistor 131 has an emitter, a base, and a collector. The collector of the bipolar transistor 131 is coupled to the voltage source Vm. The base of the bipolar transistor 131 is coupled to a reference voltage Vb, where the reference voltage Vb has a zero temperature coefficient. The emitter of the dual carrier transistor 131 is coupled to the current source CS to generate a temperature signal Vt to the selection circuit 110, wherein the temperature signal Vt changes with the temperature by a factor of about 25mV/°C. As shown in Figure 2, the bi-carrier transistor 131 can be an NPN-type bi-carrier transistor. In addition, the temperature signal Vt is related to a physical parameter, such as temperature.

The control unit 150 is coupled to the transistor 140 for generating a rotation speed signal Vs to the selection circuit 110. The control unit 150 has a judging unit 151 and the judging unit 151 is used to determine the motor controller 10 to operate in a normal operation mode or a test mode. The judging unit 151 is coupled to the command pin CMD for generating an N-bit digital signal SEL to the selection circuit 110 and generating a pulse width modulation signal Vp to the driving circuit 160, where N=2. The driving circuit 160 is used to provide a motor current to the motor. The driving circuit 160 may have an H-bridge circuit.

When the command pin CMD receives a normal pulse width modulation signal, the judgment unit 151 can set the digital signal SEL to 00 to notify the selection circuit 110 to couple the speed signal Vs to the speed signal pin SO. At this time, the motor controller 10 is in the normal operation mode, and the judging unit 151 couples the pulse width modulation signal Vp to Close to the command pin CMD to control the motor operation. When the command pin CMD receives a first start test signal, the judgment unit 151 can set the digital signal SEL to 01 to notify the selection circuit 110 to couple the temperature signal Vt to the speed signal pin SO. At this time, the motor controller 10 is in the test mode. When the command pin CMD receives a second start test signal, the judgment unit 151 can set the digital signal SEL to 10 to notify the selection circuit 110 to couple the Hall signal Vh to the rotation speed signal pin SO. At this time, the motor controller 10 is also in the test mode.

Specifically, there are various ways to generate the first start test signal and the second start test signal to enter the test mode. The first start-up test signal of an embodiment of the present invention may be a high-frequency signal and has a first frequency. The second start test signal can also be a high-frequency signal and has a second frequency. The first frequency is greater than a first predetermined frequency and the first frequency is less than a second predetermined frequency. The second frequency is greater than a third predetermined frequency and the second frequency is less than a fourth predetermined frequency. The first predetermined frequency is less than the second predetermined frequency. The third predetermined frequency is less than the fourth predetermined frequency. The second predetermined frequency is less than the third predetermined frequency.

The motor controller 10 of an embodiment of the present invention can be applied to a single-phase motor or a multi-phase motor. The motor controller 10 is used to drive a motor. The motor controller 10 has a command pin CMD, a rotation speed signal pin SO, a selection circuit 110, a control unit 150, and a drive circuit 160. The driving circuit 160 is used to provide a motor current to the motor. The control unit 150 has a judgment unit 151. The determining unit 151 is used to determine whether the motor controller 10 is operated in a normal operation mode or a test mode. The judging unit 151 is coupled to the command pin CMD. The judging unit 151 obtains a plurality of physical parameters according to the first start-up test signal and the second start-up test signal. The selection circuit 110 is coupled to the rotation speed signal pin SO, and the selection circuit 110 is used to output a Hall signal and a temperature signal. The Hall signal and the temperature signal are related to a plurality of physical parameters. The advantage of the present invention is that multiple physical parameters can be obtained in the test mode without adding additional pins.

Although the present invention has been described with the preferred embodiment as an example, it should be understood that the present invention is not limited to the disclosed embodiment. On the contrary, the present invention is intended to cover those who are familiar with the art For those of you, there are obvious modifications and similar configurations. Therefore, the scope of the patent application should be based on the broadest interpretation to include all such modifications and similar configurations.

The foregoing descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

10: Motor controller

SO: Speed signal pin

CMD: Command pin

110: select circuit

120: Hall signal processing unit

130: temperature sensor

140: Transistor

150: control unit

160: drive circuit

Vhb, Vm: voltage source

121: Hall sensor

122: Amplifier

IN1: the first input

IN2: second input

131: Double carrier transistor

CS: current source

151: Judgment Unit

Vh: Hall signal

Vb: Reference voltage

Vt: temperature signal

Vs: Speed signal

SEL: Digital signal

Vp: Pulse width modulation signal

Claims (7)

A motor controller is used to drive a motor. The motor controller includes: a first pin; a second pin; a selection circuit coupled to the second pin; and a drive circuit for providing a motor current to The motor; a temperature sensor for generating a temperature signal, wherein the temperature sensor includes: a dual carrier transistor, coupled to a first voltage source; and a current source, coupled to the dual carrier Transistor for generating the temperature signal to the selection circuit; and a control unit having a judging unit, wherein the judging unit is used for determining that the motor controller is operated in a normal operation mode or a test mode, the judging unit Coupled to the first pin, the judging unit is used to notify the selection circuit to output the temperature signal through the second pin according to a first start test signal. The motor controller described in item 1 of the scope of patent application, wherein the first start-up test signal has a first frequency, the first frequency is greater than a first predetermined frequency, the first frequency is less than a second predetermined frequency, the The first predetermined frequency is less than the second predetermined frequency. In the motor controller described in item 1 of the scope of patent application, the first pin is a command pin and the second pin is a speed signal pin. For the motor controller described in item 1 of the scope of patent application, the judging unit is used to notify the selection circuit to output a Hall signal via the second pin according to a second start test signal. For the motor controller described in item 4 of the scope of patent application, the second start test signal has a second frequency, the second frequency is greater than a third predetermined frequency, the second frequency is less than a fourth predetermined frequency, the The third predetermined frequency is less than the fourth predetermined frequency. According to the motor controller described in claim 4, the motor controller further includes a Hall signal processing unit and the Hall signal processing unit is used to generate the Hall signal. According to the motor controller described in claim 6, wherein the Hall signal processing unit includes: a Hall sensor coupled to a second voltage source for generating a first output signal and a second output signal Output signal; and an amplifier having a first input terminal and a second input terminal, wherein the first input terminal is coupled to the first output signal and the second input terminal is coupled to the second output signal for generating The Hall signal to the selection circuit.

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