CN114499337B - motor controller - Google Patents

Abstract

A motor controller to obtain multiple physical parameters. The motor controller has a selection circuit, a hall signal processing unit, a temperature sensor, a transistor, a control unit and a driving circuit. The Hall signal processing unit is used for generating 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 whether the motor controller operates in a normal operation mode or a test mode. The judging unit is used to notify the selection circuit to output the temperature signal or the Hall signal according to a first start-up test signal or a second start-up test signal.

Description

motor controller

technical field

The present invention relates to a motor controller, in particular to a motor controller capable of obtaining multiple physical parameters in a test mode.

Background technique

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 measurement. In the prior art, a pulse width modulation (PWM) 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 reduced as much as possible to improve the competitiveness of the product under the premise of saving costs. Therefore, how to make good use of the existing pins to enter the test mode to obtain the required physical parameters is an important issue to be solved at present.

Contents of the invention

In view of the aforementioned problems, the object of the present invention is to provide a motor controller capable of outputting multiple physical parameters in a test mode.

The motor controller is provided according to the invention. The motor controller is used to drive a motor. The motor controller has a command pin, a rotational speed signal pin, a selection circuit, a Hall signal processing unit, a temperature sensor, a transistor, a control unit and a driving circuit. The selection circuit is coupled to the speed signal pin. The driving circuit is used for providing a motor current to the motor. The Hall signal processing unit is used for generating 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 whether the motor controller operates in a normal operation mode or a test mode. The judging unit is coupled to the command pin. The judging unit is used to notify the selection circuit to output a temperature signal through the rotation speed signal pin according to a first start-up test signal. The judging unit is used for notifying the selection circuit to output a Hall signal through the rotational speed signal pin according to a second start-up test signal.

Description of drawings

FIG. 1 is a pin diagram of a motor controller according to an embodiment of the present invention.

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

Explanation of reference numerals: 10—motor controller; VCC—voltage supply pin; GND—grounding pin; OUT1—first output pin; OUT2—second output pin; SO—speed signal pin; CMD—command Pin position; L-motor coil; 110-selection 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-first input terminal; IN2-second input terminal; 131-bipolar 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.

Detailed ways

The following description will make the objects, features and advantages of the present invention more apparent. Preferred embodiments according to the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a pin 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. As shown in FIG. 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.

FIG. 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, wherein 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 for generating a Hall signal Vh to the 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 bipolar transistor 131 and a current source CS. The BJT 131 has an emitter, a base and a collector. The collector of bipolar transistor 131 is coupled to a voltage source Vm. The base of the BJT 131 is coupled to a reference voltage Vb, wherein the reference voltage Vb has a zero temperature coefficient. The emitter of the bipolar transistor 131 is coupled to the current source CS for generating a temperature signal Vt to the selection circuit 110, wherein the temperature signal Vt varies with temperature by a factor of about 25 mV/°C. As shown in FIG. 2 , the BJT 131 can be an NPN type BJT. 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 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 whether the motor controller 10 operates 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 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, wherein the driving circuit 160 may have an H-bridge circuit.

When the command pin CMD receives a normal PWM signal, the judging 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 the command pin CMD to control the operation of the motor. When the command pin CMD receives a first start-up test signal, the judging 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 point, the motor controller 10 is in a test mode. When the command pin CMD receives a second start-up test signal, the judging unit 151 can set the digital signal SEL to 10 to notify the selection circuit 110 to couple the Hall signal Vh to the 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-up test signal and the second start-up test signal to enter the test mode. The first start-up test signal in an embodiment of the present invention may be a high-frequency signal and has a first frequency. The second start-up 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 smaller 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 speed signal pin SO, a selection circuit 110 , a control unit 150 and a driving circuit 160 . The driving circuit 160 is used for providing a motor current to the motor. The control unit 150 has a judging unit 151 . The judging unit 151 is used to determine whether the motor controller 10 operates 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 speed signal pin SO, wherein the selection circuit 110 is used to output the Hall signal and the temperature signal. Hall signals and temperature signals are related to several physical parameters. The advantage of the present invention is that multiple physical parameters can be obtained in the test mode without adding extra pins.

Although the present invention has been described by way of illustration of preferred embodiments, it should be understood that the present invention is not limited to the disclosed embodiments. On the contrary, the invention is intended to cover various modifications and similar arrangements apparent to those skilled in the art. Accordingly, the scope of claims should be construed in the broadest way to encompass all such modifications and similar arrangements.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (9)

1. A motor controller for driving a motor, characterized in that the motor controller comprises: a first foot position; a second foot position; a selection circuit coupled to the second pin; a drive circuit for providing a motor current to the motor; and A control unit has a judging unit, wherein the judging unit is used to determine whether the motor controller operates in a normal operation mode or a test mode, the judging unit is coupled to the first pin, and the judging unit is activated according to a first The test signal is used to notify the selection circuit to output a temperature signal through the second pin, and the first start-up test signal is a high-frequency signal. 2. The motor controller according to claim 1, wherein the first start-up test signal has a first frequency, the first frequency is greater than a first predetermined frequency, and the first frequency is lower than a second predetermined frequency , the first predetermined frequency is less than the second predetermined frequency. 3. The motor controller as claimed in claim 1, wherein the first pin is a command pin and the second pin is a speed signal pin. 4. The motor controller as claimed in claim 1, further comprising a temperature sensor and the temperature sensor is used to generate the temperature signal. 5. The motor controller of claim 4, wherein the temperature sensor comprises: a bipolar transistor coupled to a first voltage source; and A current source, coupled to the bipolar transistor, is used to generate the temperature signal to the selection circuit. 6 . The motor controller according to claim 1 , wherein the judging unit is used to notify the selection circuit to output a Hall signal through the second pin according to a second startup test signal. 7. The motor controller according to claim 6, wherein the second start-up test signal has a second frequency, the second frequency is greater than a third predetermined frequency, and the second frequency is lower than a fourth predetermined frequency , the third predetermined frequency is less than the fourth predetermined frequency. 8 . The motor controller as claimed in claim 6 , further comprising a Hall signal processing unit, and the Hall signal processing unit is used to generate the Hall signal. 9. The motor controller according to claim 8, wherein the Hall signal processing unit comprises: a Hall sensor coupled to a second voltage source for generating a first output signal and a second 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.