Motor phase angle automatic control system

Abstract

This invention discloses an automatic control system for motor phase angle. A current detection circuit detects the motor's current signal and outputs a current detection signal. A control circuit outputs a control signal based on the time point at which the current signal reaches zero, as indicated by the current detection signal. A drive circuit outputs a drive signal based on the control signal. An output circuit operates based on the drive signal to output a motor operation adjustment signal to the motor, thereby adjusting the motor's operating state.

Description

Technical Field

[0001] This invention relates to motors, and more particularly to an automatic control system for motor phase angle. Background Technology

[0002] In electronic devices, fan motors are used to cool heat-generating components such as processors. Precise control of the motor's operation is crucial for optimal cooling performance during this process. However, existing motor controllers are not compatible with various fans, resulting in inefficient motor operation and high noise levels. Summary of the Invention

[0003] The technical problem this invention aims to solve is to provide an automatic motor phase angle control system, addressing the shortcomings of existing technologies. This system includes a current detection circuit, a control circuit, a drive circuit, and an output circuit, applicable to motors. The current detection circuit is configured to detect the motor's current signal and output a current detection signal. The control circuit is connected to the current detection circuit. The control circuit is configured to determine whether to adjust the motor's operating state based on the time point when the current value indicated by the current detection signal reaches zero, and outputs a control signal. The drive circuit is connected to the control circuit. The drive circuit is configured to output a drive signal based on the control signal. The output circuit is connected to the drive circuit and the motor. The output circuit is configured to operate based on the drive signal and output a motor operation adjustment signal to the motor to adjust its operating state.

[0004] In this embodiment, the control circuit determines whether the time when the current value of the motor's current signal reaches zero falls within the dead time, in order to decide whether to adjust the motor's operating state so that the time when the current signal reaches zero falls within the dead time.

[0005] In this embodiment, when the control circuit determines that the time point when the current value of the motor's current signal reaches zero falls before the dead time, the control circuit controls the drive circuit to drive the output circuit to reduce the phase angle of the motor's current signal.

[0006] In this embodiment, when the control circuit determines that the time point when the current value of the motor's current signal reaches zero falls after the dead time, the control circuit controls the drive circuit to drive the output circuit to increase the phase angle of the motor's current signal.

[0007] In this embodiment, the control circuit determines whether to adjust the motor's operating state based on the waveform of the current signal indicated by the current detection signal.

[0008] In this embodiment, when the control circuit determines that the phase angle of the current signal does not conform to the predicted phase angle based on the current values ​​at multiple time points on the waveform of the current signal, the control circuit decides to adjust the operating state of the motor.

[0009] In this embodiment, when the control circuit determines that the phase angle of the current signal is greater than the predicted phase angle based on the current values ​​at multiple time points on the waveform of the current signal, the control circuit decides to reduce the phase angle of the motor to output a control signal.

[0010] In this embodiment, when the control circuit determines that the phase angle of the current signal is less than the predicted phase angle based on the current values ​​at multiple time points on the waveform of the current signal, the control circuit decides to increase the phase angle of the motor to output a control signal.

[0011] In this embodiment, the output circuit includes multiple upper-bridge switches and multiple lower-bridge switches. The control circuit controls the drive circuit to simultaneously turn off each upper-bridge switch and each lower-bridge switch within the dead time.

[0012] In this embodiment, during a back EMF detection time after the dead time, the control circuit detects the back EMF of the motor to determine the position of the motor rotor, and controls the drive circuit to drive the output circuit accordingly.

[0013] In this embodiment, the motor is a single-phase motor or a three-phase motor.

[0014] As described above, the present invention provides an automatic motor phase angle control system that can detect the current value of the current signal of various electronic devices such as fans, and determine whether to automatically correct the phase angle of the motor based on the time point when the current value of the motor current signal reaches zero, so as to reduce the vibration noise of the motor.

[0015] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0016] Figure 1 This is a block diagram of the automatic motor phase angle control system according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the automatic motor phase angle control system and motor configuration according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the current signal of the motor controlled by the automatic motor phase angle control system in an embodiment of the present invention, showing the phase angle of the motor.

[0019] Figure 4This is a schematic diagram of the current signal when the phase angle of the motor controlled by the automatic motor phase angle control system in an embodiment of the present invention is insufficient.

[0020] Figure 5 This is a schematic diagram of the current signal with too much phase angle of the motor controlled by the automatic motor phase angle control system of this embodiment of the invention. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. Furthermore, the accompanying drawings of the present invention are for simple illustrative purposes only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention. In addition, the term "or" as used herein may, depending on the actual situation, include any combination of any one or more of the associated listed items.

[0022] Please see Figure 1 This is a block diagram of the automatic motor phase angle control system according to an embodiment of the present invention. Figure 1 As shown, the automatic motor phase angle control system of this embodiment of the invention may include a current detection circuit 10, a control circuit 20, a drive circuit 30, and an output circuit 40, and can be applied to motors MT such as single-phase motors or three-phase motors.

[0023] The current detection circuit 10 can be connected to the control circuit 20 and the drive circuit 30. The output circuit 40 can be connected to the drive circuit 30 and the motor MT.

[0024] The current detection circuit 10 can detect the current signal of the motor MT and output a current detection signal. The control circuit 20 can determine whether it is necessary to adjust the operating state of the motor MT based on the current detection signal received from the current detection circuit 10 and the time point when the current value of the motor MT reaches zero, as indicated by the current detection signal, and output a control signal.

[0025] The drive circuit 30 can receive a control signal from the control circuit 20 and output a drive signal based on the control signal. The output circuit 40 can operate based on the drive signal received from the drive circuit 30 and output a motor operation adjustment signal to the motor MT to adjust the operating state of the motor MT.

[0026] Please see Figure 1 and Figure 2 ,in Figure 1This is a block diagram of the automatic motor phase angle control system according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the automatic motor phase angle control system and motor configuration according to an embodiment of the present invention.

[0027] like Figure 1 The output circuit 40 shown may include multiple upper bridge switches, for example... Figure 2 The first upper bridge switch HD1, the second upper bridge switch HD2, and the third upper bridge switch HD3 shown, as well as multiple lower bridge switches, are illustrated. Figure 2 The first lower bridge switch LD1, the second lower bridge switch LD2, and the third lower bridge switch LD3 are shown. These upper bridge switches and lower bridge switches can be transistors of various forms, and the present invention is not limited thereto.

[0028] The first terminal of the first upper bridge switch HD1 can be coupled to the first input voltage VINU. The second terminal of the first upper bridge switch HD1 can be connected to the first terminal of the first lower bridge switch LD1. The second terminal of the first lower bridge switch LD1 can be coupled to the first reference voltage VGU, for example, ground. The node NU between the second terminal of the first upper bridge switch HD1 and the first terminal of the first lower bridge switch LD1 can be connected to the first terminal of the first coil CLU of the U phase of the motor MT, for example, a three-phase motor. The second terminal of the first coil CLU can be connected to the shared terminal COM of the motor MT.

[0029] The first terminal of the second upper bridge switch HD2 can be coupled to the second input voltage VINV. The second terminal of the second upper bridge switch HD2 can be connected to the first terminal of the second lower bridge switch LD2. The second terminal of the second lower bridge switch LD2 can be coupled to the second reference voltage VGV, for example, ground. The node NV between the second terminal of the second upper bridge switch HD2 and the first terminal of the second lower bridge switch LD2 can be connected to the first terminal of the second coil CLV of the V phase of the motor MT, for example, a three-phase motor. The second terminal of the second coil CLV can be connected to the shared terminal COM of the motor MT.

[0030] The first terminal of the third upper bridge switch HD3 can be coupled to the third input voltage VINW. The second terminal of the third upper bridge switch HD3 can be connected to the first terminal of the third lower bridge switch LD3. The second terminal of the third lower bridge switch LD3 can be coupled to the third reference voltage VGW, for example, ground. The node NW between the second terminal of the third upper bridge switch HD3 and the first terminal of the third lower bridge switch LD3 can be connected to the first terminal of the third coil CLW of the W phase of the motor MT, for example, a three-phase motor. The second terminal of the third coil CLW can be connected to the shared terminal COM of the motor MT.

[0031] The current detection circuit 10 can be electrically connected to or in contact with the first terminal of the first coil CLU of phase U, the first terminal of the second coil CLV of phase V, and the first terminal of the third coil CLW of phase W of the motor MT, such as a three-phase motor. The current detection circuit 10 can detect the current signal flowing through any one or each of the first coil CLU of phase U, the second coil CLV of phase V, and the third coil CLW of phase W of the motor MT, such as a three-phase motor.

[0032] Alternatively, the current detection circuit 10 can be connected or electrically contacted to node NU between the second terminal of the first upper bridge switch HD1 and the first terminal of the first lower bridge switch LD1, node NV between the second terminal of the second upper bridge switch HD2 and the first terminal of the second lower bridge switch LD2, and node NW between the second terminal of the third upper bridge switch HD3 and the first terminal of the third lower bridge switch LD3. The current detection circuit 10 can detect the current signal flowing through any one or each of nodes NU, NV, and NW.

[0033] The current detection circuit 10 can output a current detection signal to the control circuit 20 based on the detected current signal. It is worth noting that the control circuit 20 can determine whether the operating state of the motor MT needs to be adjusted based on the time point when the current value of any phase of the motor MT indicated by the current detection signal reaches zero, and output multiple control signals to the drive circuit 30.

[0034] The drive circuit 30 can be connected to the control terminal of the first upper bridge switch HD1, the control terminal of the first lower bridge switch LD1, the control terminal of the second upper bridge switch HD2, the control terminal of the second lower bridge switch LD2, the control terminal of the third upper bridge switch HD3, and the control terminal of the third lower bridge switch LD3.

[0035] The drive circuit 30 can output multiple drive signals to the control terminals of the first upper bridge switch HD1, the first lower bridge switch LD1, the second upper bridge switch HD2, the second lower bridge switch LD2, the third upper bridge switch HD3, and the third lower bridge switch LD3 of the output circuit 40 respectively, based on the multiple control signals received from the control circuit 20, so as to control the operation of the output circuit 40 and thereby adjust the operating state of the motor MT.

[0036] Please refer to the following: Figures 1 to 5 ,in Figure 3 This is a schematic diagram of the current signal of the motor controlled by the automatic motor phase angle control system in an embodiment of the present invention, showing the phase angle of the motor being exactly the same. Figure 4 This is a schematic diagram of the current signal indicating insufficient phase angle of the motor controlled by the automatic motor phase angle control system in an embodiment of the present invention. Figure 5This is a schematic diagram of the current signal with too much phase angle of the motor controlled by the automatic motor phase angle control system of this embodiment of the invention.

[0037] like Figure 1 The control circuit 20 shown can control the drive circuit to drive each upper bridge switch of the output circuit 40 (e.g., Figure 2 The first upper bridge switch HD1, the second upper bridge switch HD2, and the third upper bridge switch HD3 shown) and each lower bridge switch (e.g. Figure 2 The first lower bridge switch LD1, the second lower bridge switch LD2, and the third lower bridge switch LD3 shown are in the following configuration: Figure 3 The device is shut down simultaneously within the dead time T1 shown.

[0038] The control circuit 20 can determine whether the time point when the current value of the current signal of the motor MT reaches zero falls within the dead time T1 of the motor MT, so as to decide whether to adjust the operating state of the motor MT so that the time point when the current signal of any phase of the motor MT reaches zero falls within the dead time T1.

[0039] When the control circuit 20 determines that the time point when the current value of the motor MT reaches zero falls before the dead time T1, the control circuit 20 can output a control signal with a phase angle reduction indication message to control the drive circuit 30 to drive the output circuit 40 to adjust the operating state of the motor MT, so as to reduce the phase angle of the current signal of the motor MT.

[0040] Conversely, when the control circuit 20 determines that the time point when the current value of the motor MT reaches zero falls after the dead time T1, the control circuit 20 outputs a control signal with an increased phase angle indication message to control the drive circuit 30 to drive the output circuit 40 to adjust the operating state of the motor MT, so as to increase the phase angle of the current signal of the motor MT.

[0041] The control circuit 20 can also determine whether to adjust the operating state of the motor MT based on the current values ​​at multiple time points indicated by the waveform of the current signal of the motor MT as indicated by the current detection signal.

[0042] When the control circuit 20 determines that the phase angle of the current signal of the motor MT does not conform to a predicted phase angle based on the current value at multiple time points of the current signal waveform, the control circuit 20 decides to adjust the operating state of the motor MT.

[0043] For example, such as Figure 4As shown, the phase angle of the current signal IL01 of the motor MT is insufficient. At this time, the vibration and noise of the motor MT are high, which can easily lead to misjudgment of the commutation point of the motor MT. When the control circuit 20 determines that the phase angle of the current signal IL01 is less than the predicted phase angle based on the current values ​​at multiple time points of the waveform of the current signal IL01 of the motor MT, the control circuit 20 decides to output a control signal with an increased phase angle indication message to the drive circuit 30. The drive circuit 30 drives the output circuit 40 according to this control signal, causing the motor MT to generate... Figure 3 The current signal IL shown is in phase.

[0044] Conversely, such as Figure 5 As shown, the phase angle of the current signal IL02 of the motor MT is too large, resulting in high vibration and noise and poor operating efficiency of the motor MT. When the control circuit 20 determines that the phase angle of the current signal IL02 is greater than the predicted phase angle based on the current values ​​at multiple time points of the waveform of the current signal IL02 of the motor MT, the control circuit 20 outputs a control signal with a phase angle reduction indication message to the drive circuit 30. The drive circuit 30 drives the output circuit 40 according to this control signal, causing the motor MT to generate... Figure 3 The current signal IL shown is in phase.

[0045] During the back EMF detection time T2 after the dead time T1 ends, the control circuit 20 or other detection circuits can detect the back EMF of each phase of the motor MT to determine the rotor position of the motor MT. Based on the detected rotor position of the motor MT, the control circuit 20 can control the drive circuit 30 to drive the output circuit 40 to operate, thereby controlling the operation of the motor MT.

[0046] In summary, the present invention provides an automatic motor phase angle control system that can detect the current value of the motor current signal of various electronic devices such as fans, and determine whether to automatically correct the motor phase angle based on the time point when the current value of the motor current signal reaches zero, so as to reduce the vibration noise of the motor.

[0047] The above-disclosed content is only a preferred embodiment of the present invention and is not intended to limit the claims of the present invention. Therefore, all equivalent technical changes made based on the description and drawings of the present invention are included in the claims of the present invention.

Claims

1. An automatic phase angle control system for motors, characterized in that, The automatic motor phase angle control system includes: A current detection circuit is configured to detect the current signal of the motor and output a current detection signal. A control circuit, connected to the current detection circuit, is configured to determine whether the time point at which the current value of the current signal indicated by the current detection signal reaches zero falls within a dead time of the motor, so as to output a control signal. A drive circuit, connected to the control circuit, is configured to output a drive signal according to the control signal; as well as An output circuit, connected to the drive circuit and the motor, is configured to operate according to the drive signal to output a motor operation adjustment signal to the motor to adjust the operating state of the motor. Wherein, when the control circuit determines that the time point when the current value of the motor's current signal reaches zero falls before the dead time, the control circuit is configured to output the control signal having a reduced phase angle indication message to the drive circuit, and the drive circuit is configured to drive the output circuit to adjust the operating state of the motor according to the control signal having the reduced phase angle indication message, so as to reduce the phase angle of the motor's current signal, so that the time point when the motor's current signal reaches zero falls within the dead time; Specifically, when the control circuit determines that the time point when the current value of the motor's current signal reaches zero falls after the dead time, the control circuit is configured to output a control signal with an increased phase angle indication message to the drive circuit. The drive circuit is configured to drive the output circuit to adjust the operating state of the motor according to the control signal with the increased phase angle indication message, so as to increase the phase angle of the motor's current signal, so that the time point when the motor's current signal reaches zero falls within the dead time.

2. The automatic motor phase angle control system according to claim 1, characterized in that, The output circuit includes multiple upper bridge switches and multiple lower bridge switches, and the control circuit controls the drive circuit to drive each upper bridge switch and each lower bridge switch to close simultaneously within the dead time.

3. The automatic motor phase angle control system according to claim 1, characterized in that, During the back EMF detection time after the dead time, the control circuit detects the back EMF of the motor to determine the position of the motor rotor, and controls the drive circuit to drive the output circuit accordingly.

4. The automatic motor phase angle control system according to claim 1, characterized in that, The control circuit determines whether to adjust the operating state of the motor based on the waveform of the current signal indicated by the current detection signal.

5. The automatic motor phase angle control system according to claim 1, characterized in that, When the control circuit determines that the phase angle of the current signal does not conform to the predicted phase angle based on the current value at multiple time points on the waveform of the current signal, the control circuit decides to adjust the operating state of the motor.

6. The automatic motor phase angle control system according to claim 1, characterized in that, When the control circuit determines that the phase angle of the current signal is greater than the predicted phase angle based on the current values ​​at multiple time points on the waveform of the current signal, the control circuit decides to reduce the phase angle of the motor to output the control signal.

7. The automatic motor phase angle control system according to claim 1, characterized in that, When the control circuit determines that the phase angle of the current signal is less than the predicted phase angle based on the current value at multiple time points on the waveform of the current signal, the control circuit decides to increase the phase angle of the motor to output the control signal.

8. The automatic motor phase angle control system according to claim 1, characterized in that, The motor is either a single-phase motor or a three-phase motor.

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