Motor control system, method, storage medium and electronic device

Abstract

The application discloses a motor control system, a motor control method, a storage medium and an electronic device. The motor control method comprises the following steps: a power supply circuit is used for outputting a first direct current voltage; a thin film capacitor is connected in parallel on both sides of the power supply circuit; a surge suppression circuit is connected in parallel on both sides of the thin film capacitor, and is used for suppressing a surge voltage on both sides of the thin film capacitor to obtain a second direct current voltage, wherein the surge voltage is the first direct current voltage exceeding a first preset voltage; and a driving circuit is connected with the surge suppression circuit and a motor, and is used for driving the motor according to the second direct current voltage. The application solves the technical problem of damage to the circuit caused by the fact that the thin film capacitor is difficult to absorb a large amount of surge voltage.

Description

Technical Field

[0001] This invention relates to the field of motor controllers, and more specifically, to a motor control system, method, storage medium, and electronic device. Background Technology

[0002] In the field of motor controllers, aluminum electrolytic capacitors are often used for filtering after rectification. However, with technological advancements and increasingly stringent requirements for motors, the electrolyte in aluminum electrolytic capacitors tends to dry out, shortening the controller's lifespan. Therefore, film capacitors have emerged as a replacement for aluminum electrolytic capacitors and have been mass-produced in multiple industries. Particularly in the wind turbine field, film capacitors have a much higher tolerance for ripple current than aluminum electrolytic capacitors of the same capacitance. Therefore, at the same power rating, the capacitance of film capacitors is much smaller than that of aluminum electrolytic capacitors. However, when a surge voltage or surge current suddenly occurs on the DC side after rectification, the small-capacitance film capacitor has limited capacity to absorb surge energy, often leading to abnormal motor operation and even damage to the controller's hardware circuitry.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This invention provides a motor control system, method, storage medium, and electronic device to at least solve the technical problem of circuit damage caused by the inability of thin-film capacitors to absorb large surge voltages.

[0005] According to one aspect of the present invention, a motor control system is provided, comprising: a power supply circuit for outputting a first DC voltage; a thin-film capacitor connected in parallel across the power supply circuit; a surge suppression circuit connected in parallel across the thin-film capacitor for suppressing surge voltage across the thin-film capacitor to obtain a second DC voltage, wherein the surge voltage is the first DC voltage exceeding a first preset voltage; and a drive circuit connected to the surge suppression circuit and the motor for driving the motor according to the second DC voltage.

[0006] Optionally, the surge suppression circuit includes: a first electronic component, the first terminal of which is connected to the positive terminal of the power supply circuit; an aluminum electrolytic capacitor, the positive terminal of which is connected to the second terminal of the first electronic component, and the negative terminal of which is connected to the negative terminal of the power supply circuit; and a first resistor, the first terminal of which is connected to the positive terminal of the aluminum electrolytic capacitor, and the second terminal of which is connected to the negative terminal of the aluminum electrolytic capacitor.

[0007] Optionally, the surge suppression circuit further includes: a second resistor, the first end of which is connected to the first end of the first electronic component; and a diode, the cathode of which is connected to the second end of the second resistor, and the anode of which is connected to the first end of the first resistor and the positive terminal of the aluminum electrolytic capacitor.

[0008] Optionally, the system further includes: a monitoring circuit, the first terminal of which is connected to the positive terminal of the aluminum electrolytic capacitor and the first terminal of the first resistor, and the second terminal of which is grounded. The monitoring circuit is used to monitor the voltage across the aluminum electrolytic capacitor to obtain a monitoring result, which is used to indicate the state of the aluminum electrolytic capacitor absorbing surge voltage.

[0009] Optionally, the monitoring circuit includes: a third resistor, the first end of which is connected to the first end of the monitoring circuit; a fourth resistor, the first end of which is connected to the second end of the third resistor, and the second end of the fourth resistor is grounded; and a controller, the input end of which is connected to the first end of the fourth resistor and the second end of the third resistor.

[0010] Optionally, the third resistor may include: a first sub-resistor and a second sub-resistor, wherein the first sub-resistor and the second sub-resistor are connected in series.

[0011] Optionally, the first electronic component includes at least one passive device, wherein the passive device can operate in the circuit without a power supply when a signal is present. If the first electronic component includes multiple passive devices, the multiple passive devices are connected in series or in parallel.

[0012] Optionally, the number of passive devices in the first electronic component is determined based on the surge voltage.

[0013] Optionally, the power supply circuit includes: an AC power supply for outputting AC voltage; and a rectifier bridge circuit connected to the AC power supply for rectifying the AC voltage to obtain a first DC voltage.

[0014] Optionally, the AC power supply can be a single-phase AC power supply or a three-phase AC power supply.

[0015] According to another aspect of the present invention, a motor control method is also provided, comprising: outputting a first DC voltage through a power supply circuit; in response to the first DC voltage being greater than or equal to a first preset voltage, suppressing the surge voltage across a thin-film capacitor using a surge suppression circuit to obtain a second DC voltage, wherein the thin-film capacitor is connected in parallel across the power supply circuit and the surge suppression circuit is connected in parallel across the thin-film capacitor; and driving a motor using a drive circuit according to the second DC voltage.

[0016] Optionally, the surge suppression circuit includes: a first electronic component, an aluminum electrolytic capacitor, and a first resistor, wherein a first terminal of the first electronic component is connected to the positive terminal of the power supply circuit, the positive terminal of the aluminum electrolytic capacitor is connected to the second terminal of the first electronic component, the negative terminal of the aluminum electrolytic capacitor is connected to the negative terminal of the power supply circuit, a first terminal of the first resistor is connected to the positive terminal of the aluminum electrolytic capacitor, and a second terminal of the first resistor is connected to the negative terminal of the aluminum electrolytic capacitor.

[0017] Optionally, the surge suppression circuit includes: a first electronic component, an aluminum electrolytic capacitor, and a first resistor. In response to a first DC voltage being greater than or equal to a first preset voltage, the surge suppression circuit controls the surge voltage across the thin-film capacitor to obtain a second DC voltage. This includes: in response to the first DC voltage being greater than or equal to the first preset voltage, turning on the first electronic component; using the aluminum electrolytic capacitor to absorb the surge voltage to obtain the second DC voltage; and in response to the aluminum electrolytic capacitor's capacitor voltage being greater than the second preset voltage, discharging the aluminum electrolytic capacitor using the first resistor.

[0018] Optionally, the surge suppression circuit further includes: a second resistor and a diode, wherein the first end of the second resistor is connected to the first end of the first electronic component, the cathode of the diode is connected to the second end of the second resistor, and the anode of the diode is connected to the first end of the first resistor and the positive terminal of the aluminum electrolytic capacitor.

[0019] Optionally, the method further includes: discharging the aluminum electrolytic capacitor using the diode in response to the diode's capacitor voltage being greater than a third preset voltage; and limiting the current of the diode using a second resistor.

[0020] Optionally, the method further includes: monitoring the voltage across the aluminum electrolytic capacitor using a monitoring circuit to obtain a monitoring result, wherein the monitoring result is used to indicate the state of the aluminum electrolytic capacitor absorbing surge voltage; and outputting the monitoring result to the client.

[0021] According to another aspect of the present invention, a motor control device is also provided, comprising: an output module for outputting a first DC voltage through a power supply circuit; a suppression module for suppressing surge voltage across a thin-film capacitor using a surge suppression circuit in response to the first DC voltage being greater than or equal to a first preset voltage, thereby obtaining a second DC voltage, wherein the thin-film capacitor is connected in parallel across the power supply circuit, and the surge suppression circuit is connected in parallel across the thin-film capacitor; and a drive module for driving a motor according to the second DC voltage using a drive circuit.

[0022] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the method described in any of the above-described embodiments.

[0023] According to another aspect of the present invention, an electronic device is also provided, including: a processor; and a memory connected to the processor for providing the processor with a method for performing any of the above-described methods.

[0024] In this embodiment of the invention, the system includes a power supply circuit for outputting a first DC voltage; a film capacitor connected in parallel across the power supply circuit; a surge suppression circuit connected in parallel across the film capacitor for suppressing surge voltages across the film capacitor to obtain a second DC voltage, wherein the surge voltage exceeds the first preset voltage; and a drive circuit connected to the surge suppression circuit and the motor for driving the motor based on the second DC voltage. It is noteworthy that by connecting surge voltages across the film capacitor and absorbing the surge voltages in the DC voltage output from the film capacitor to obtain the second DC voltage, and using the drive circuit to drive the motor based on the second DC voltage, the safety and stability of the circuit can be ensured, further solving the technical problem of circuit damage caused by the film capacitor's inability to absorb large amounts of surge voltage. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of a motor control system according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of bus voltage variation according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of voltage changes at both ends of an aluminum electrolysis device according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of a surge suppression circuit and the circuit it is located in, according to an embodiment of the present invention;

[0030] Figure 5 This is a flowchart of a motor control method according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of a motor control device according to an embodiment of the present invention. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] The following are some drawbacks of the related technologies:

[0035] 1. The problem of weak surge suppression capability of film capacitors is not considered. Under unstable power grid or load conditions, the DC side circuit of the driver is easily damaged.

[0036] 2. The DC-side surge suppression circuit in related technologies has a generally poor absorption effect and slow response, which may damage the DC-side circuit of the driver in some cases.

[0037] Example 1

[0038] According to an embodiment of the present invention, a method embodiment for a motor control system is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0039] Figure 1 This is a schematic diagram of a motor control system according to an embodiment of the present invention, such as... Figure 1 As shown, the motor control system includes:

[0040] The power supply circuit 102 is used to output the first DC voltage.

[0041] The power supply circuit described above can be used to provide the power required by the entire motor control system, wherein the power supply can be AC ​​power or DC power.

[0042] The aforementioned first DC voltage can be obtained by converting the AC voltage provided by the power supply circuit, or it can be directly provided by the power supply circuit. Optionally, the AC voltage can be converted into DC voltage through a rectifier, or through other conversion circuits and methods.

[0043] In an optional embodiment, when the power supply circuit is an AC power source, a rectifier bridge can be connected after the AC power source to convert the AC voltage output by the AC power source into a DC voltage. The AC power source can include a three-phase AC power source or a single-phase AC power source. There is no limitation on the type of AC power source. The rectifier bridge can be obtained by encapsulating rectifier diodes. The rectifier bridge can be used to convert AC power to DC power.

[0044] In another alternative embodiment, a DC power supply circuit can be used to directly supply power to the motor control system, and the DC voltage output by the DC power supply can be used to power the motor control system.

[0045] A 104 film capacitor is connected in parallel across the power supply circuit.

[0046] The aforementioned film capacitors can be used to eliminate voltage ripple, thereby filtering the circuit and ensuring its stability. Optionally, the number of film capacitors can be one or more.

[0047] In one optional embodiment, a film capacitor can be connected in parallel across the two sides of the power supply circuit, or multiple film capacitors can be connected in series and then the combined film capacitor can be connected in parallel across the two sides of the power supply circuit, thereby filtering the power supply circuit and enabling the power supply circuit to output a stable voltage.

[0048] In another alternative embodiment, multiple film capacitors can be connected in series or in parallel, and the combined film capacitors can be connected in parallel with the power supply circuit, thereby enabling the power supply circuit to output a stable voltage.

[0049] The surge suppression circuit 106 is connected in parallel across the two sides of the film capacitor to suppress the surge voltage across the film capacitor and obtain a second DC voltage. The surge voltage is a first DC voltage that exceeds the first preset voltage.

[0050] The surge suppression circuit described above can be used to absorb surge energy in DC voltage. This circuit can be composed of one or more of the following: a current-limiting resistor, a varistor, a transient voltage suppressor diode, an aluminum electrolytic capacitor, a clamping diode, and a bleeder resistor, connected in series or parallel. The current-limiting resistor, varistor, transient voltage suppressor diode, aluminum electrolytic capacitor, clamping diode, and bleeder resistor can protect the circuit when the voltage or current is too high.

[0051] The aforementioned second DC voltage can be a DC voltage obtained by absorbing the surge voltage generated by the DC voltage supplied by the power supply circuit through the surge suppression circuit, or a DC voltage obtained by absorbing the surge voltage generated by the DC voltage obtained after converting AC voltage through the surge suppression circuit.

[0052] The aforementioned first preset voltage can be the critical value of the surge voltage that the circuit can withstand, that is, the operating voltage of the surge suppression circuit. The first preset voltage can be set by the user according to requirements or the actual situation in the circuit; the user can be someone skilled in the art.

[0053] The aforementioned first DC voltage can be the surge voltage that needs to be absorbed by the surge suppression circuit. Optionally, the DC voltage provided by the power supply circuit, or the DC voltage obtained after AC voltage conversion, can be compared with the first preset voltage. If the DC voltage is greater than the first preset voltage, the DC voltage at that moment can be determined as the first DC voltage, and the surge suppression circuit can be used to absorb the first DC voltage.

[0054] In one optional embodiment, a surge suppression circuit can be connected to both sides of the film capacitor. This circuit effectively absorbs surge energy from the power supply circuit or rectifier bridge, including surge voltage or surge current, thereby preventing damage to the DC-side hardware circuitry and improving product reliability and safety. It can also absorb surge energy caused by emergency disconnection, controlling rapidly rising voltage and protecting the circuit. Optionally, the surge suppression circuit involved in this application can continuously absorb surge voltage during circuit operation, or it can absorb surge voltage only when a large voltage exists. That is, the surge suppression circuit will only activate and absorb the surge voltage when the bus voltage is greater than a first preset voltage, and will terminate the absorption of the surge voltage when the bus voltage is less than the first preset voltage.

[0055] The drive circuit 108, connected to the surge suppression circuit and the motor, is used to drive the motor according to the second DC voltage.

[0056] The aforementioned drive circuit is connected between the surge suppression circuit and the motor to drive the motor. The drive circuit may include, but is not limited to, one or more capacitors, resistors, inverter bridges, and diodes. Optionally, the motor may be the main unit carrying the entire circuit.

[0057] In one alternative embodiment, after the surge suppression circuit absorbs the first DC voltage, a second DC voltage can be obtained. Optionally, a drive circuit can be connected after the surge suppression circuit so that the motor can be driven by the drive circuit based on the second DC voltage.

[0058] Figure 2 This is a schematic diagram of bus voltage variation according to an embodiment of the present invention, such as... Figure 2 As shown, when the DC bus of the drive circuit is not subjected to surge voltage, the bus voltage is the DC voltage directly output by the power supply circuit or the DC voltage after rectification. However, when a surge voltage is generated in the bus, the bus voltage will rise rapidly until it reaches the working voltage of the surge suppression circuit. At this point, the surge suppression circuit will rapidly reduce the bus voltage and control it within the safe voltage range for the devices.

[0059] The system described above includes a power supply circuit for outputting a first DC voltage; a film capacitor connected in parallel across the power supply circuit; a surge suppression circuit connected in parallel across the film capacitor to suppress surge voltages across the film capacitor, resulting in a second DC voltage. The surge voltage exceeds the first preset voltage. A drive circuit connected to the surge suppression circuit and the motor drives the motor based on the second DC voltage. It is noteworthy that by connecting surge voltages across the film capacitor and absorbing the surge voltages in the output DC voltage, a second DC voltage can be obtained. Using the drive circuit based on this second DC voltage to drive the motor ensures circuit safety and stability, further resolving the technical problem of circuit damage caused by the film capacitor's inability to absorb large surge voltages.

[0060] Optionally, the surge suppression circuit includes: a first electronic component, the first terminal of which is connected to the positive terminal of the power supply circuit; an aluminum electrolytic capacitor, the positive terminal of which is connected to the second terminal of the first electronic component, and the negative terminal of which is connected to the negative terminal of the power supply circuit; and a first resistor, the first terminal of which is connected to the positive terminal of the aluminum electrolytic capacitor, and the second terminal of which is connected to the negative terminal of the aluminum electrolytic capacitor.

[0061] The first electronic component mentioned above can be a transient suppression diode, a varistor, or other varistor-type passive components.

[0062] The transient voltage suppressor diode can be a unidirectional transient voltage suppressor diode used to suppress voltage in a DC circuit. When the circuit is operating normally, the transient voltage suppressor diode is in a high-impedance cutoff state and does not affect the normal operation of the circuit. When an abnormal high voltage occurs in the circuit, it can clamp the bus voltage to a lower level, thereby protecting the circuit. The varistor can also suppress the bus voltage to a lower level when an abnormal high voltage occurs in the circuit, thus protecting the circuit. Optionally, the first electronic component can be one or more connected in series; in this application, a transient voltage suppressor diode is used as the first electronic component for illustration.

[0063] The first terminal of the aforementioned first electronic component can be the cathode of a transient suppression diode. Optionally, the cathode of the transient suppression diode can be connected to the positive terminal of the power supply circuit, and the anode can be connected to the positive terminal of an aluminum electrolytic capacitor.

[0064] The second terminal of the first electronic component mentioned above can be the anode of a transient suppression diode.

[0065] The aluminum electrolytic capacitors mentioned above can absorb transient surge energy by utilizing their filtering and voltage regulation functions, reducing the impact of surge energy on downstream circuits. Generally, the larger the capacitance value, the better the surge suppression effect. However, in actual use, users can choose the area of ​​the aluminum electrolytic capacitor based on cost and board area.

[0066] Figure 3 This is a schematic diagram of voltage changes across the two ends of an aluminum electrolysis electrode according to an embodiment of the present invention, as shown below. Figure 3 As shown, the voltage across the aluminum electrolytic capacitor undergoes waveform transformation. During surge suppression circuit operation, the aluminum electrolytic capacitor is charged. The surge voltage magnitude and frequency on the DC side are sampled and recorded. Optionally, a monitor can be installed, storing the recorded results in a detector. The detector can then feed back surge voltage information to the user, allowing them to understand the equipment's operating status and receive early warnings.

[0067] The aforementioned first resistor can be a bleeder resistor. This bleeder resistor absorbs excessive voltage in the circuit, thereby reducing the output voltage and protecting the circuit. Optionally, introducing a bleeder resistor into the circuit provides a bleeder circuit for the aluminum electrolytic capacitor. The number of bleeder resistors can be one or more; this application does not limit the number of bleeder resistors.

[0068] The first end and the second end of the first resistor mentioned above can be the two ends of a bleed resistor.

[0069] In one optional embodiment, the surge suppression circuit can be composed of a transient voltage suppressor diode, a bleeder resistor, an aluminum electrolytic capacitor, or other functionally related components. The positive terminal of the aluminum electrolytic capacitor can be connected to the anode of the transient voltage suppressor diode, and the negative terminal of the aluminum electrolytic capacitor can be connected to the negative terminal of the power supply circuit and one end of the bleeder resistor. Optionally, the cathode of the transient voltage suppressor diode is connected to the positive terminal of the power supply circuit, thereby forming the surge suppression circuit. Optionally, this surge suppression circuit can absorb surge voltages in the DC circuit, thereby protecting the circuit.

[0070] In another alternative embodiment, the surge suppression circuit achieves high reliability by utilizing the reverse breakdown characteristics and voltage clamping properties of the transient suppression diode. Furthermore, because the transient suppression diode clamps a portion of the voltage, the capacitance applied to the aluminum electrolytic capacitor can be significantly reduced, allowing for a relatively small capacitance value that can be lower than the DC-side voltage at the rectifier's downstream end. In this application, passive electronic components are used, resulting in a simple and clear circuit structure. Complex logic judgments or control loops are not required to control the operation of the absorption circuit, effectively reducing circuit response time.

[0071] Optionally, the surge suppression circuit further includes: a second resistor, the first end of which is connected to the first end of the first electronic component; and a diode, the cathode of which is connected to the second end of the second resistor, and the anode of which is connected to the first end of the first resistor and the positive terminal of the aluminum electrolytic capacitor.

[0072] The second resistor mentioned above can be a current-limiting resistor, which can be used to prevent excessive current in the circuit from damaging the device. The number of current-limiting resistors can be one or more, and this application does not limit the number of current-limiting resistors.

[0073] The first end of the second resistor and the second end of the second resistor mentioned above are the two ends of the current-limiting resistor, respectively.

[0074] The aforementioned diode can be a clamping diode, which can forcibly clamp the signal to a certain potential, so that raising or lowering the reference potential of the signal does not change the waveform of the original signal. Optionally, introducing a clamping diode into the circuit can prevent the positive terminal of the DC voltage from charging the aluminum electrolytic capacitor, but can provide a discharge path when the voltage across the aluminum electrolytic capacitor is higher than the DC bus voltage. The number of clamping diodes can be one or more; this application does not limit the number of clamping diodes.

[0075] In an optional embodiment, the surge suppression circuit may further include a current-limiting resistor, a clamping diode, or other components with similar functions. Optionally, the anode of the clamping diode can be connected to the positive terminal of the aluminum electrolytic capacitor and one end of the bleeder resistor; the cathode of the clamping diode can be connected to one end of the current-limiting resistor; and the other end of the current-limiting resistor can be connected to the cathode of the transient suppression diode, thus obtaining the surge suppression circuit. This surge suppression circuit can then be connected to a DC voltage to protect the circuit. Optionally, when the motor experiences an abnormal emergency stop, the bus voltage using a small-value film capacitor can easily rise to a very high level. With this surge absorption circuit, the voltage rise can be effectively suppressed, thereby protecting the components.

[0076] Optionally, the system further includes: a monitoring circuit, the first terminal of which is connected to the positive terminal of the aluminum electrolytic capacitor and the first terminal of the first resistor, and the second terminal of which is grounded. The monitoring circuit is used to monitor the voltage across the aluminum electrolytic capacitor to obtain a monitoring result, which is used to indicate the state of the aluminum electrolytic capacitor absorbing surge voltage.

[0077] The monitoring circuit described above can be used to monitor the surge voltage absorbed by the surge suppression circuit. Optionally, the monitoring circuit can be composed of one or more resistors connected in series, or one or more resistors connected to a controller. Optionally, the number of resistors in the monitoring circuit is not limited.

[0078] In one optional embodiment, after assembling the surge suppression circuit, a monitoring circuit can be connected to one end of the surge suppression circuit to evaluate the application environment of the surge suppression circuit. Optionally, a monitoring circuit can be formed by connecting one or more resistors and a controller, wherein the controller can be used to control the starting, speed regulation, braking, and reversing of the motor by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit in a predetermined sequence.

[0079] In another alternative embodiment, by using a monitoring circuit to monitor the voltage amplitude and voltage pulse frequency on the aluminum electrolysis, the amplitude and frequency of voltage impacts on the controller from the preceding circuit can be determined. Furthermore, after determining the amplitude and frequency of voltage impacts on the controller from the preceding circuit, the relevant information can be sent to the user via communication, thereby providing feedback on the surge suppression circuit's performance in absorbing surge voltages.

[0080] Optionally, the monitoring circuit includes: a third resistor, the first end of which is connected to the first end of the monitoring circuit; a fourth resistor, the first end of which is connected to the second end of the third resistor, and the second end of the fourth resistor is grounded; and a controller, the input end of which is connected to the first end of the fourth resistor and the second end of the third resistor.

[0081] The third and fourth resistors mentioned above can be thermistors or other types of resistors. Optionally, there can be one or more third and fourth resistors. There are no restrictions on the type and number of resistors here.

[0082] In one optional embodiment, the monitoring circuit may include multiple resistors and a controller. One end of the third resistor may be connected to the surge suppression circuit, and the other end to the controller. One end of the fourth resistor is connected to the controller, and the other end is grounded. That is, the monitoring circuit starts with the third resistor and ends with the fourth resistor, with the controller connected between the third and fourth resistors. Optionally, the monitoring circuit can monitor the voltage across the aluminum electrolytic capacitor and can promptly detect whether the controller is subjected to surge impacts or the frequency of surge impacts.

[0083] Optionally, the third resistor may include: a first sub-resistor and a second sub-resistor, wherein the first sub-resistor and the second sub-resistor are connected in series.

[0084] The first and second sub-resistors mentioned above can be thermistors or other types of resistors; there are no restrictions on the types of the first and second sub-resistors here.

[0085] In one optional embodiment, the third resistor can be formed by connecting multiple resistors in series. In this application, an example is given where the third resistor is formed by connecting two resistors in series. Optionally, the third resistor can be formed by connecting the first sub-resistor and the second sub-resistor in series. Optionally, one end of the third resistor can be connected to a surge suppression circuit, and the other end can be connected to a controller to monitor the surge suppression circuit.

[0086] Optionally, the first electronic component includes at least one passive device, wherein the passive device can operate in the circuit without a power supply when a signal is present. If the first electronic component includes multiple passive devices, the multiple passive devices are connected in series or in parallel.

[0087] The passive devices mentioned above can be transient suppression diodes or varistors. These passive devices can operate normally even without a power supply in the circuit. Optionally, passive devices can be used for signal transmission or signal amplification.

[0088] In one optional embodiment, the number of passive devices included in the first electronic component can be one or more. The number of passive devices is not limited in this application. Optionally, when the number of passive devices is greater than one, the user can choose to connect the passive devices in series or in parallel according to actual needs.

[0089] Optionally, the number of passive devices in the first electronic component can be determined based on the surge voltage that may need to be suppressed.

[0090] In one alternative embodiment, the user can first use a voltmeter or other means to roughly measure the surge voltage in the circuit to obtain the approximate range of the surge voltage. Optionally, after obtaining the approximate range of the surge voltage, the approximate range of the surge voltage can be compared with the surge voltage that each passive device can absorb. In the process of comparison, the suppression of surge voltage by other components in the surge suppression circuit can be combined to determine the number of passive devices in the first electronic component.

[0091] Optionally, the power supply circuit includes: an AC power supply for outputting AC voltage; and a rectifier bridge circuit connected to the AC power supply for rectifying the AC voltage to obtain a first DC voltage.

[0092] In one optional embodiment, the power supply circuit may include an AC power source and a rectifier bridge circuit. Optionally, the AC power source can provide AC power to downstream circuits connected to it. The AC power source can be connected to the rectifier bridge circuit, which converts the AC power output from the AC power source into DC power, thereby obtaining a first DC voltage. Optionally, the first DC voltage can be used to power a surge suppression circuit.

[0093] Optionally, the AC power supply can be a single-phase AC power supply or a three-phase AC power supply.

[0094] In one optional embodiment, the AC power source mentioned in this application can be a single-phase AC power source or a three-phase AC power source. This application does not impose specific restrictions on the type of AC power source.

[0095] Figure 4 This is a schematic diagram of a surge suppression circuit and its circuit according to an embodiment of the present invention, as shown below. Figure 4 As shown, the entire circuit can be divided into power supply circuit, rectifier bridge, surge suppression circuit, drive circuit, monitoring circuit, and motor from left to right.

[0096] The power supply circuit can be a three-phase AC power supply, with the busbars of the three-phase AC power supply represented by R, S, and T respectively. Optionally, the power supply circuit may include multiple resistors RV1, RV2, and RV3, a gas discharge tube TVS1, and multiple capacitors C_R, C_S, C_T, and C1, C2, C3, and C4, connected in series and parallel to the three-phase AC power supply. One end of the gas discharge tube TVS1 and one end of capacitor C4 need to be grounded, i.e., the PE terminal in the diagram. Optionally, Figure 4 The section within the black solid line box represents the rectifier bridge. This bridge is connected to the power supply circuit via three lines (L1, L2, L3) and converts AC voltage to DC voltage. Two capacitors, CY1 and CY2, can be connected across the rectifier bridge to absorb voltage from the circuit, and these capacitors are then grounded. Optional... Figure 4The black dashed box in the image represents the surge suppression circuit. A thin-film capacitor CL1 can be connected to both ends of this circuit. This surge suppression circuit consists of a transient suppression diode (TVS2), an aluminum electrolytic capacitor (E1), a bleeder resistor (R2), a clamping diode (D1), and a current-limiting resistor (R1). Furthermore, six inverter bridges can be connected to the right end of the surge suppression circuit. Each inverter bridge can be composed of three parts (1, 2, and 3). Adding inverter bridges converts the DC voltage output from the surge suppression circuit into AC voltage. Optionally, a monitoring circuit can be added below the inverter bridges. This monitoring circuit, composed of resistors R3, R4, and R5 and a monitor, can monitor the voltage amplitude and voltage pulse frequency on the aluminum electrolytic capacitor, determining the magnitude and frequency of voltage surges to the controller from the preceding circuit. Finally, the AC voltage converted by the inverter bridges is sent to the motor.

[0097] The following are the beneficial effects of this application:

[0098] 1. Passive electronic components are used in the surge suppression circuit. The circuit structure is simple and clear. There is no need for complex logic judgment or control loops to control whether the absorption circuit works, which can effectively reduce the circuit response time.

[0099] 2. The surge suppression circuit utilizes the reverse breakdown characteristics of transient suppression diodes and the physical characteristics of voltage clamping, which makes the surge suppression circuit highly reliable.

[0100] 3. When the DC power supply side after rectification by the rectifier bridge circuit encounters surge energy, the surge suppression circuit absorbs the surge energy quickly because the surge circuit contains transient suppression diodes. The transient suppression diodes have a response time on the order of nanoseconds. This prevents downstream devices from being damaged due to the need to withstand high voltage for a long time.

[0101] 4. When the motor encounters an abnormal emergency stop, the bus voltage using a small-value film capacitor can easily rise to a very high level. With this surge absorption circuit, the voltage rise can be effectively suppressed, thereby protecting the components.

[0102] 5. In surge suppression circuits, because the transient suppression diode clamps part of the voltage, the capacitance applied to the aluminum electrolytic capacitor can be significantly reduced. Therefore, the voltage rating of the aluminum electrolytic capacitor can be chosen to be relatively small, lower than the voltage on the DC side of the rectifier.

[0103] 6. Before the DC side is subjected to a surge or after the surge has ended, since the surge suppression circuit is not yet connected to the DC side, the input power factor will not decrease or the current harmonics will not increase due to the large capacitance of the aluminum electrolytic capacitor.

[0104] 7. The monitoring circuit can monitor the voltage across the aluminum electrolytic capacitor and can detect in a timely manner whether the controller is subjected to surge impact or the frequency of surge impact.

[0105] 8. Users can select the surge voltage tolerance of electronic components as needed, and flexibly change the model of transient suppression diodes and the capacitance and withstand voltage of aluminum electrolytic capacitors. Therefore, surge suppression circuits can be suitable for various applications.

[0106] Example 2

[0107] According to an embodiment of the present invention, an embodiment of a motor control method is also provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0108] Figure 5 This is a flowchart of a motor control method according to an embodiment of the present invention, such as... Figure 5 As shown, the method includes the following steps:

[0109] Step S502: Output the first DC voltage through the power supply circuit.

[0110] In step S504, in response to the first DC voltage being greater than or equal to the first preset voltage, the surge voltage across the thin film capacitor is suppressed using a surge suppression circuit to obtain a second DC voltage. The thin film capacitor is connected in parallel across the power supply circuit, and the surge suppression circuit is connected in parallel across the thin film capacitor.

[0111] In one alternative embodiment, a first DC voltage can be detected by a voltmeter or other device. When the first DC voltage is greater than or equal to a first preset voltage, the surge suppression circuit will start working to absorb the surge voltage on both sides of the thin film capacitor that exceeds the first preset voltage, thereby obtaining a second DC voltage.

[0112] Step S506: Drive the motor using the drive circuit based on the second DC voltage.

[0113] Optionally, the surge suppression circuit includes: a first electronic component, an aluminum electrolytic capacitor, and a first resistor, wherein a first terminal of the first electronic component is connected to the positive terminal of the power supply circuit, the positive terminal of the aluminum electrolytic capacitor is connected to the second terminal of the first electronic component, the negative terminal of the aluminum electrolytic capacitor is connected to the negative terminal of the power supply circuit, a first terminal of the first resistor is connected to the positive terminal of the aluminum electrolytic capacitor, and a second terminal of the first resistor is connected to the negative terminal of the aluminum electrolytic capacitor.

[0114] Optionally, the surge suppression circuit includes: a first electronic component, an aluminum electrolytic capacitor, and a first resistor. In response to a first DC voltage being greater than or equal to a first preset voltage, the surge suppression circuit controls the surge voltage across the thin-film capacitor to obtain a second DC voltage. This includes: in response to the first DC voltage being greater than or equal to the first preset voltage, turning on the first electronic component; using the aluminum electrolytic capacitor to absorb the surge voltage to obtain the second DC voltage; and in response to the aluminum electrolytic capacitor's capacitor voltage being greater than the second preset voltage, discharging the aluminum electrolytic capacitor using the first resistor.

[0115] The aforementioned second preset voltage can be set by the user. The second preset voltage can be compared with the second DC voltage output by the aluminum electrolytic capacitor to determine whether to use the first resistor to discharge the aluminum electrolytic capacitor.

[0116] In one optional embodiment, when a surge voltage is generated in the busbar, the busbar voltage will rise rapidly until it reaches a first preset voltage. At this point, the transient suppression diode will be turned on, and the surge suppression circuit will start working. The aluminum electrolytic capacitor can then absorb the surge voltage, rapidly reducing the busbar voltage. Optionally, after absorption by the aluminum electrolytic capacitor, a second DC voltage can be output. After outputting the second DC voltage, a second preset voltage can be compared with the second DC voltage output by the aluminum electrolytic capacitor. If the second DC voltage output by the aluminum electrolytic capacitor is greater than the second preset voltage, the first resistor can be used to discharge the aluminum electrolytic capacitor, thereby protecting the components in the surge suppression circuit.

[0117] Optionally, the surge suppression circuit further includes: a second resistor and a diode, wherein the first end of the second resistor is connected to the first end of the first electronic component, the cathode of the diode is connected to the second end of the second resistor, and the anode of the diode is connected to the first end of the first resistor and the positive terminal of the aluminum electrolytic capacitor.

[0118] Optionally, the method further includes: discharging the aluminum electrolytic capacitor using the diode in response to the diode's capacitor voltage being greater than a third preset voltage; and limiting the current of the diode using a second resistor.

[0119] The aforementioned third preset voltage can be used to compare with the diode's capacitor voltage. Optionally, the third preset voltage can be set by the user.

[0120] In one alternative embodiment, the diode's capacitor voltage can be detected by a relevant method. When the diode's capacitor voltage is greater than a third preset voltage, the diode can be used to discharge the aluminum electrolytic capacitor, and a second resistor can be used to limit the current of the diode. That is, when the voltage is higher, an additional circuit can be added to discharge the aluminum electrolytic capacitor using the diode, thereby avoiding damage to components caused by excessive voltage.

[0121] Optionally, the method further includes: monitoring the voltage across the aluminum electrolytic capacitor using a monitoring circuit to obtain a monitoring result, wherein the monitoring result is used to indicate the state of the aluminum electrolytic capacitor absorbing surge voltage; and outputting the monitoring result to the client.

[0122] Example 3

[0123] According to an embodiment of the present invention, a motor control device is also provided. Figure 6 This is a schematic diagram of a motor control device according to an embodiment of the present invention, as shown below. Figure 6 As shown, the device includes:

[0124] Output module 602 outputs a first DC voltage through a power supply circuit;

[0125] The suppression module 604, in response to a first DC voltage being greater than or equal to a first preset voltage, uses a surge suppression circuit to suppress the surge voltage across the thin film capacitor to obtain a second DC voltage, wherein the thin film capacitor is connected in parallel across the power supply circuit and the surge suppression circuit is connected in parallel across the thin film capacitor.

[0126] The drive module 606 uses a drive circuit to drive the motor according to the second DC voltage.

[0127] Optionally, the device further includes: a discharge module for discharging the aluminum electrolytic capacitor using the diode in response to the diode's capacitor voltage being greater than a third preset voltage; and a current limiting module for limiting the current of the diode using a second resistor.

[0128] Optionally, the device further includes: a monitoring module for monitoring the voltage across the aluminum electrolytic capacitor using a monitoring circuit to obtain monitoring results, wherein the monitoring results are used to indicate the state of the aluminum electrolytic capacitor absorbing surge voltage; and an output module for outputting the monitoring results to the client.

[0129] Example 4

[0130] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the method described in any of the above-described embodiments.

[0131] Example 5

[0132] According to another aspect of the present invention, an electronic device is also provided, including: a processor; and a memory connected to the processor for providing the processor with a method for performing any of the above-described methods.

[0133] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0134] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0135] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0136] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0137] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0138] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0139] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A motor control system, characterized in that, include: The power supply circuit is used to output the first DC voltage; A thin-film capacitor is connected in parallel across the power supply circuit. A surge suppression circuit is connected in parallel across the two sides of the thin-film capacitor to suppress the surge voltage across the thin-film capacitor and obtain a second DC voltage. The surge voltage is a first DC voltage that exceeds a first preset voltage. The first preset voltage is used to represent the operating voltage of the surge suppression circuit. A drive circuit, connected to the surge suppression circuit and the motor, is used to drive the motor according to the second DC voltage; The surge suppression circuit includes: A first electronic component, wherein a first terminal of the first electronic component is connected to the positive terminal of the power supply circuit, wherein the first electronic component is used to conduct when the first DC voltage is greater than or equal to the first preset voltage; An aluminum electrolytic capacitor, wherein the positive terminal of the aluminum electrolytic capacitor is connected to the second terminal of the first electronic component, and the negative terminal of the aluminum electrolytic capacitor is connected to the negative terminal of the power supply circuit, and the aluminum electrolytic capacitor is used to absorb the surge voltage to obtain the second DC voltage; The first resistor has a first end connected to the positive terminal of the aluminum electrolytic capacitor and a second end connected to the negative terminal of the aluminum electrolytic capacitor. The first resistor is used to discharge the aluminum electrolytic capacitor when the capacitor voltage is greater than a second preset voltage. The first resistor represents a discharge resistor.

2. The system according to claim 1, characterized in that, The surge suppression circuit also includes: The second resistor has its first end connected to the first end of the first electronic component; A diode, wherein the cathode of the diode is connected to the second end of the second resistor, and the anode of the diode is connected to the first end of the first resistor and the positive terminal of the aluminum electrolytic capacitor.

3. The system according to claim 2, characterized in that, The system also includes: A monitoring circuit is provided, wherein a first terminal of the monitoring circuit is connected to the positive terminal of the aluminum electrolytic capacitor and the first terminal of the first resistor, and a second terminal of the monitoring circuit is grounded. The monitoring circuit is used to monitor the voltage across the aluminum electrolytic capacitor to obtain a monitoring result, which is used to indicate the state of the aluminum electrolytic capacitor absorbing the surge voltage.

4. The system according to claim 3, characterized in that, The monitoring circuit includes: A third resistor, the first end of which is connected to the first end of the monitoring circuit; A fourth resistor, wherein the first end of the fourth resistor is connected to the second end of the third resistor, and the second end of the fourth resistor is grounded; The controller has its input terminal connected to the first terminal of the fourth resistor and the second terminal of the third resistor.

5. The system according to claim 4, characterized in that, The third resistor includes a first sub-resistor and a second sub-resistor, wherein the first sub-resistor and the second sub-resistor are connected in series.

6. The system according to claim 1, characterized in that, The first electronic component includes at least one passive device, wherein the passive device can operate in the circuit without a power supply when there is a signal. When the first electronic component includes multiple passive devices, the multiple passive devices are connected in series or in parallel.

7. The system according to claim 6, characterized in that, The number of passive devices in the first electronic component is determined based on the surge voltage.

8. The system according to claim 1, characterized in that, The power supply circuit includes: AC power supply, used to output AC voltage; A rectifier bridge circuit, connected to the AC power supply, is used to rectify the AC voltage to obtain the first DC voltage.

9. The system according to claim 8, characterized in that, The AC power supply is a single-phase AC power supply or a three-phase AC power supply.

10. A motor control method, characterized in that, include: The first DC voltage is output through the power supply circuit; In response to the first DC voltage being greater than or equal to the first preset voltage, the surge voltage across the thin film capacitor is suppressed using a surge suppression circuit to obtain a second DC voltage. The thin film capacitor is connected in parallel across the power supply circuit, and the surge suppression circuit is connected in parallel across the thin film capacitor. The first preset voltage is used to represent the operating voltage of the surge suppression circuit. The motor is driven by the drive circuit based on the second DC voltage; The surge suppression circuit includes: a first electronic component, an aluminum electrolytic capacitor, and a first resistor. In response to the first DC voltage being greater than or equal to a first preset voltage, the surge suppression circuit suppresses the surge voltage across the thin-film capacitor to obtain a second DC voltage, including: In response to the first DC voltage being greater than or equal to the first preset voltage, the first electronic component is turned on; The surge voltage is absorbed by the aluminum electrolytic capacitor to obtain the second DC voltage; In response to the aluminum electrolytic capacitor's voltage being greater than a second preset voltage, the aluminum electrolytic capacitor is discharged using the first resistor. The first terminal of the first electronic component is connected to the positive terminal of the power supply circuit, the positive terminal of the aluminum electrolytic capacitor is connected to the second terminal of the first electronic component, the negative terminal of the aluminum electrolytic capacitor is connected to the negative terminal of the power supply circuit, the first terminal of the first resistor is connected to the positive terminal of the aluminum electrolytic capacitor, and the second terminal of the first resistor is connected to the negative terminal of the aluminum electrolytic capacitor. The first resistor represents the bleedering resistor.

11. The method according to claim 10, characterized in that, The surge suppression circuit further includes a second resistor and a diode, wherein the first end of the second resistor is connected to the first end of the first electronic component, the cathode of the diode is connected to the second end of the second resistor, and the anode of the diode is connected to the first end of the first resistor and the positive terminal of the aluminum electrolytic capacitor.

12. The method according to claim 11, characterized in that, The method further includes: In response to the diode's capacitor voltage being greater than a third preset voltage, the aluminum electrolytic capacitor is discharged using the diode; The second resistor is used to limit the current of the diode.

13. The method according to claim 10, characterized in that, The method further includes: The voltage across the aluminum electrolytic capacitor is monitored using a monitoring circuit to obtain a monitoring result, wherein the monitoring result is used to indicate the state of the aluminum electrolytic capacitor absorbing the surge voltage; The monitoring results are then output to the client.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 10 to 13.

15. An electronic device, characterized in that, include: processor; as well as A memory, connected to the processor, for providing the processor with the means to perform the method according to any one of claims 10 to 13.

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