TWI668954B - Motor controller - Google Patents

Abstract

The invention discloses a motor controller comprising a control circuit and a voltage adjustment circuit, and the control circuit outputs a control signal. The voltage adjustment circuit is coupled to the control circuit and an input power source, and generates an output voltage according to the input power source, and the voltage adjustment circuit receives the control signal, and adjusts a voltage level of the output voltage according to the control signal, wherein the input power source A voltage level is higher than the voltage level of the output voltage, or the voltage level of the output voltage is higher than the voltage level of the input power source.

Description

Motor controller

The present invention relates to a controller, and more particularly to a motor controller.

With the rapid development of industrial automation technology, the control of electric motors has also become an important technology. Among them, the control of the motor is very important. There are many types of motors, but they can be roughly divided into DC motors and AC motors. DC motors use DC power as the power source to make the coils pass current. There is a permanent magnet next to the coils to electromagnetically induce the rotation to rotate. The speed of the AC motor is proportional to the frequency, so the higher the frequency, the faster the speed. Therefore, there is a frequency converter next to the AC motor on the common conveyor belt to control the transmission speed. Therefore, various controls for the AC motor, such as the output response of the motor, the modulation of the motor drive voltage, and the motor speed, are all items that the industry wants to control. However, none of the controllers currently can control the above functions.

In view of the above-mentioned deficiencies of the prior art, the present invention provides a motor controller that can control the output response of the AC motor, the driving voltage, and the motor speed, and is not limited by the level of the power source when driving the AC motor.

It is an object of the present invention to provide a motor controller that controls an output response, a drive voltage, and a motor speed of an AC motor.

The invention discloses a motor controller comprising a control circuit and a voltage adjustment circuit, and the control circuit outputs a control signal. The voltage adjustment circuit is coupled to the control circuit and an input power source, and generates an output voltage according to the input power source, and the voltage adjustment circuit receives the control signal, and adjusts a voltage level of the output voltage according to the control signal, wherein the input power source A voltage level is higher than the voltage level of the output voltage, or the voltage level of the output voltage is higher than the voltage level of the input power source.

Certain terms are used throughout the description and subsequent claims to refer to particular elements. It should be understood by those of ordinary skill in the art that the manufacturer may refer to the same component by different nouns. This specification and the scope of the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the difference in the overall technical characteristics of the elements as the criterion for distinguishing. The term "comprising" as used throughout the scope of the specification and subsequent patent applications is an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is coupled to a second device, the first device can be directly electrically connected to the second device, or can be indirectly electrically connected to the second device through other devices or other connection means.

In order to give your reviewers a better understanding and understanding of the features and effects of the present invention, please refer to the examples and the detailed descriptions, as explained below:

Please refer to the first figure, which is a schematic diagram of an embodiment of a motor controller of the present invention. As shown, a power source 10 is coupled (electrically coupled) to a motor controller 20 and generates an input power source S10 to the motor controller 20. The motor controller 20 is coupled to an AC motor 30 and generates a driving voltage S80 to the AC motor 30 according to the input power source S10. The voltage level change of the driving voltage S80 can adjust the output response of the AC motor 30. The motor controller 20 includes a voltage adjustment circuit 40. The voltage adjustment circuit 40 is coupled to the power source 10 to receive the input power source S10, and generates an output voltage S40 according to the input power source S10. The voltage level of the output voltage S40 can be higher than the voltage level of the input power source S10, or the voltage level of the input power source S10 can be higher than the voltage level of the output voltage S40, so the voltage adjusting circuit 40 can be a bidirectional buck-boost circuit.

The motor controller 20 includes a communication module 50, which can store various related information of the vehicle, such as battery SOC, battery temperature, motor speed or/and brake status, and output an adjustment data S50 according to various related information. . The motor controller 20 includes a control circuit 60. The control circuit 60 is coupled to the communication module 50 to receive the adjustment data S50, and outputs a control signal S60 according to the adjustment data S50. The control circuit 60 is coupled to the voltage adjustment circuit 40, and outputs the control signal S60 to the voltage adjustment circuit 40 after processing the adjustment data S50. Therefore, the control circuit 60 can be a control chip and includes a processing circuit for processing various related information of the vehicle. The output voltage S40 of the voltage adjustment circuit 40. The control circuit 60 further adjusts the signal S62 according to the output.

The motor controller 20 includes a phase circuit 70 coupled to the control circuit 60 for receiving the adjustment signal S62. The phase circuit 70 outputs a phase signal S70 according to the adjustment signal S62. Therefore, the adjustment signal S62 is used to adjust the phase signal S70; the phase signal S70 is used to adjust an output phase of the driving voltage S80. The motor controller 20 includes a voltage output circuit 80. The voltage output circuit 80 is coupled to the voltage adjustment circuit 40 to receive the output voltage S40, and outputs a driving voltage S80 according to the output voltage S40. Further, the voltage output circuit 80 is coupled to the phase circuit 70. Receiving the phase signal S70, the voltage output circuit 80 outputs the phase of the different driving voltage S80 according to the phase signal S70. The voltage output circuit 80 can be a six-arm circuit, including six MOS transistors or six insulated gate bipolar transistors (IGBTs), so the phase circuit 70 is based on the adjustment signal as shown in the first embodiment. S62 outputs six phase signals S70, and the high and low levels of the six phase signals S70 can determine the output phase of the driving voltage S80.

Please refer to the second figure, which is a schematic diagram of a first embodiment of a voltage adjustment circuit of the present invention. As shown, the power source 10 can be a battery 12 that provides a battery voltage S12 to a voltage regulation circuit 40. The voltage adjustment circuit 40 includes a pulse width modulation circuit (PWM) 42. The pulse width modulation circuit 42 is coupled to the control circuit 60 to receive the control signal S60. The pulse width modulation circuit 42 generates a working signal according to the control signal S60. S42, the duty cycle (Duty) of the work signal S42 is adjusted according to the control signal S60. In other words, the duty cycle of the work signal S42 is adjusted according to the adjustment data S50 of the communication module 50 of the first figure. The voltage adjusting circuit 40 includes a voltage generating circuit 44 that is coupled to the battery 12 to receive the battery voltage S12 and generates an output voltage S40 according to the battery voltage S12. The voltage generating circuit 44 is coupled to the pulse width modulation circuit 42 to receive the working signal S42. The voltage generating circuit 44 adjusts the voltage level of the output voltage S40 according to the working signal S42. Therefore, the voltage of the output voltage S40 is controlled by the operation signal S42. The bit can be lower or higher than the voltage level of the battery voltage S12, and thus the voltage level of the motor driving voltage S80 can be modulated. Therefore, the motor controller 20 of the embodiment can drive the high voltage AC motor with a lower voltage power source or a low voltage AC motor with a higher voltage power source.

The voltage generating circuit 44 includes a switch SW, a diode D, an inductive component L, a capacitive component C, and a resistive component R. The switch SW is coupled between the battery 12 and the diode D, and is inductive. The component L is coupled to the circuit node between the switch SW and the diode D, and the diode D is coupled to the capacitive component C and the resistive component R, the diode D, the inductive component L, the capacitive component C, and the resistor The element R is coupled to a reference level, and the reference level is the potential of the negative terminal of the battery 12. Therefore, the voltage level of the output voltage S40 is determined by controlling the charge and discharge of the voltage generating circuit 44 by the switching of the control switch SW via the operation signal S42.

Please refer to the third figure, which is a schematic diagram of a second embodiment of the voltage adjustment circuit of the present invention. As shown, the output of the voltage adjustment circuit 40 of the second embodiment is coupled to the voltage output circuit 80 and the control circuit 60, and the output of the voltage adjustment circuit 40 of the first embodiment is coupled to the voltage output circuit 80 but is not coupled to the control. Circuit 60. In this way, the motor controller 20 can use the output of the voltage adjustment circuit 40 to feed back to the control circuit 60, and after detecting the output voltage S40, the output voltage S40 is adjusted by the pulse width modulation circuit 42 to ensure that the output voltage S40 conforms to the communication module. 50 adjustment data S50.

Please refer to the fourth figure, which is a schematic diagram of a first embodiment of a control circuit of the present invention. As shown in the figure, the control circuit 60 includes an operation unit 62 coupled to the voltage adjustment circuit 40. In other words, the operation unit 62 is coupled to the circuit node between the voltage generation circuit 44 and the voltage output circuit 80, that is, the control circuit. The circuit 60 is coupled to a circuit node between the voltage generating circuit 44 and the voltage output circuit 80. Moreover, the operation unit 62 receives a voltage demand command Vreq; the operation unit 62 operates the voltage demand command Vreq and the output voltage S40 of the voltage adjustment circuit 40 to output a control signal S60 to the pulse width modulation circuit 42, wherein the voltage demand command Vreq can The command for the user to adjust the output voltage S40, or the command generated by the motor controller 20 based on the relevant information of the vehicle.

Please refer to the fifth figure, which is a schematic diagram of a second embodiment of a control circuit of the present invention. As shown, the control circuit 60 includes a closed loop control circuit 64 coupled between the arithmetic unit 62 and the pulse width modulation circuit 42. The operation unit 62 calculates an operation signal S62 according to the voltage demand command Vreq and the output voltage S40, and the closed loop control circuit 64 receives the operation signal S62 to generate the control signal S60 to the pulse width modulation circuit 42, thereby adjusting the voltage of the driving voltage S80. Level.

Please refer to the sixth figure, which is a schematic diagram of a third embodiment of the control circuit of the present invention. As shown, the control circuit 60 includes a voltage command unit 66 coupled to the arithmetic unit 62 and receiving battery SOC, battery temperature, motor speed, or/and brake status. Therefore, the voltage command unit 66 generates a voltage demand command Vreq according to the battery SOC, the battery temperature, the motor speed, and/or the brake state. In other words, the voltage command unit 66 can be coupled between the communication module 50 and the computing unit 62. Therefore, in the embodiment of the fifth to sixth figures, when the AC motor 30 exceeds the rated rotational speed, the output voltage S40 can be raised to raise the voltage level of the driving voltage S80, overcoming the back electromotive force (voltage) of the AC motor 30, The AC motor 30 is allowed to get more current in and out, thereby increasing the speed of the AC motor 30. Furthermore, when the vehicle performs braking or deceleration during high-speed travel, the back electromotive force of the AC motor 30 is high, and thus the recharging flow from the voltage output circuit 80 and the voltage generating circuit 44 to the battery 12 is high, so The control circuit 60 uses the voltage adjustment circuit 40 to change the return charging voltage and adjust the return charging current according to the information such as the battery SOC, the battery temperature, the motor speed, and/or the braking state, so that the charging voltage is recharged at an appropriate voltage level. Battery 12 does not affect the operation of the vehicle.

However, the foregoing is only a part of the embodiments of the present invention, and is not intended to limit the scope of the embodiments of the present invention. Therefore, the structures, circuits, features and spirits described in the patent application scope of the present invention. Equivalent changes and modifications are intended to be included in the scope of the invention.

10‧‧‧Power supply

12‧‧‧Battery

20‧‧‧Motor controller

30‧‧‧AC motor

40‧‧‧Voltage adjustment circuit

42‧‧‧ Pulse width modulation circuit

44‧‧‧Voltage generation circuit

50‧‧‧Communication module

60‧‧‧Control circuit

62‧‧‧ arithmetic unit

64‧‧‧Closed loop control circuit

66‧‧‧Voltage command unit

70‧‧‧ phase circuit

80‧‧‧Voltage output circuit

C‧‧‧Capacitive components

D‧‧‧ diode

L‧‧‧Inductive components

R‧‧‧Resistive components

S10‧‧‧ input power

S12‧‧‧ battery voltage

S40‧‧‧ output voltage

S42‧‧‧ work signal

S50‧‧‧Adjustment information

S60‧‧‧ control signal

S62‧‧‧Adjustment signal

S70‧‧‧ phase signal

S80‧‧‧ drive voltage

SW‧‧ switch

Vreq‧‧‧Voltage Demand Command

1 is a schematic view showing an embodiment of a motor controller of the present invention; FIG. 2 is a schematic view showing a first embodiment of a voltage regulating circuit of the present invention; A schematic diagram of a second embodiment of the adjustment circuit; a fourth diagram: a schematic diagram of a first embodiment of the control circuit of the present invention; and a fifth diagram: a schematic diagram of a second embodiment of the control circuit of the present invention And the sixth figure: it is a schematic diagram of a third embodiment of the control circuit of the present invention.

Claims (6)

A motor controller comprising: a control circuit for outputting a control signal; a voltage adjustment circuit coupled to the control circuit and an input power source, generating an output voltage according to the input power source, receiving the control signal, according to the control signal Adjusting a voltage level of the output voltage, a voltage level of the input power source is higher than the voltage level of the output voltage, or the voltage level of the output voltage is higher than the voltage level of the input power source; The pulse width modulation circuit generates a working signal, coupled to the control circuit to receive the control signal, and adjusts a working period of the working signal according to the control signal, the voltage level of the output voltage is determined according to the working signal Adjusting the duty cycle; a voltage output circuit coupled to the voltage adjusting circuit, receiving the output voltage, outputting a driving voltage according to the output voltage; and a phase adjusting circuit coupled to the voltage output circuit to output a phase signal to the a voltage output circuit, the phase signal adjusts an output phase of the driving voltage, and is coupled to the control circuit to receive an adjustment signal , According to the adjustment signal to adjust the phase of the signal. The motor controller of claim 1, comprising: a voltage generating circuit coupled to the pulse width modulation circuit and the input power source, receiving the input power source, and generating the output voltage according to the input power source, Receiving the working signal, adjusting the voltage level of the output voltage according to the working period of the working signal. The motor controller of claim 1, comprising: a communication module coupled to the control circuit, outputting an adjustment data to the control circuit, the control circuit adjusting the output voltage according to the adjustment data Voltage level. The motor controller of claim 1, wherein the control circuit is coupled to a circuit node between a voltage generating circuit and a voltage output circuit, receives the output voltage, and generates the control according to the output voltage. The signal adjusts a voltage level of a driving voltage. A motor controller includes: a control circuit that outputs a control signal, the control circuit includes a voltage command unit and an operation unit, the voltage command unit receives a command signal to generate a voltage demand signal; and a voltage adjustment circuit And coupling the control circuit and an input power source, generating an output voltage according to the input power source, receiving the control signal, and adjusting a voltage level of the output voltage according to the control signal, wherein a voltage level of the input power source is higher than the The voltage level of the output voltage, or the voltage level of the output voltage is higher than the voltage level of the input power source; wherein the computing unit is coupled to the voltage command unit, and coupled to a voltage generating circuit and a A circuit node between the voltage output circuits receives the voltage demand signal and the output voltage, generates the control signal according to the voltage demand signal and the output voltage, and adjusts a voltage level of a driving voltage. A motor controller includes: a control circuit that outputs a control signal, the control circuit includes a voltage command unit, an arithmetic unit, and a closed loop control circuit, the voltage command unit receives a command signal to generate a voltage demand signal And a voltage adjustment circuit coupled to the control circuit and an input power source, generating an output voltage according to the input power source, receiving the control signal, adjusting a voltage level of the output voltage according to the control signal, and the input power source The voltage level is higher than the voltage level of the output voltage, or the voltage level of the output voltage is higher than the voltage level of the input power source; The computing unit is coupled to the voltage command unit, and coupled to a circuit node between a voltage generating circuit and a voltage output circuit, and receives the voltage demand signal and the output voltage according to the voltage demand signal and the output. The voltage generates an operation signal; the closed loop control circuit is coupled to the operation unit, receives the operation signal, generates the control signal according to the operation signal, and adjusts a voltage level of a driving voltage.