Driving circuit and motor system

Abstract

The utility model relates to a driving circuit, which comprises a PFC (Power Factor Correction) circuit module, a PFC protection module and a central control module. The PFC circuit module executes driving control operation on a driving object of the driving circuit according to the driving control signal sent by the central control module; the PFC protection module collects running state signals of the PFC circuit module and a driving object, transmits the running state signals to the central control module, and executes PFC control operation according to a PFC control signal sent by the central control module; the central control module generates and sends a driving control signal to the PFC circuit module, and generates and sends a PFC control signal to the PFC protection module according to the operation state signal, so that the PFC control signal can be generated according to the operation states of the PFC circuit and the driving object to control the PFC circuit, and the state of the PFC circuit can be adjusted in real time according to the overall state of the driving circuit. The PFC chip is prevented from being impacted by large voltage and current stress, and the loss of the PFC circuit is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a drive circuit and motor system. Background Technology

[0002] In existing technologies, drive circuits with PFC (Power Factor Correction) functionality primarily rely on the internal logic of the PFC chip to control the activation and deactivation of the PFC function. PFC chips often have preset fixed parameters and control logic, adjusting only based on basic signals such as input and output voltages, without considering the actual operating state of the drive circuit. However, because the PFC circuit state cannot be adjusted in real time according to the overall state of the drive circuit, when the load on the drive circuit changes significantly, the power devices in the circuit, such as switching transistors and diodes, will experience substantial voltage and current stress. Prolonged exposure to this condition will shorten the lifespan of the devices and may even affect the reliability of the entire system.

[0003] Therefore, a driving circuit is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a drive circuit and a motor system including the drive circuit, so as to reduce the loss of PFC circuit and avoid large voltage and current stress impact on PFC chip.

[0005] To achieve the above objectives, this utility model provides a driving circuit, including: a PFC circuit module, a PFC protection module, and a central control module;

[0006] The PFC circuit module is connected to the PFC protection module and the central control module respectively, and is used to perform drive control operations on the drive object of the drive circuit according to the drive control signal sent by the central control module.

[0007] The PFC protection module is connected to the PFC circuit module and the central control module respectively, and is used to collect the running status signals of the PFC circuit module and the driven object, transmit the running status signals to the central control module, and perform PFC control operations according to the PFC control signals sent by the central control module.

[0008] The central control module is used to generate and send the drive control signal to the PFC circuit module, and to generate and send the PFC control signal to the PFC protection module based on the operating status signal.

[0009] Optionally, the PFC protection module includes: a modulation signal acquisition unit and an object signal acquisition unit;

[0010] The modulation signal acquisition unit is connected to the PFC circuit module and the central control module respectively, and is used to acquire the PFC modulation signal of the PFC circuit module and transmit the PFC modulation signal to the central control module.

[0011] The object signal acquisition unit is connected to the PFC circuit module and the central control module respectively, and is used to acquire the object operation signal of the PFC circuit module and transmit the object operation signal to the central control module.

[0012] Optionally, the modulation signal acquisition unit includes: an output voltage acquisition subunit;

[0013] The output voltage acquisition subunit is connected to the PFC circuit module and the central control module respectively, and is used to acquire the PFC output voltage signal of the PFC circuit module and transmit the PFC output voltage signal to the central control module.

[0014] Optionally, the output voltage acquisition subunit includes: a first resistor and a second resistor;

[0015] The first end of the first resistor is connected to the voltage output terminal of the PFC circuit module, and the second end is connected to the first end of the second resistor and the central control module.

[0016] The first end of the second resistor is connected to the second end of the first resistor and the central control module, and the second end is grounded.

[0017] Optionally, the modulation signal acquisition unit includes: an input voltage acquisition subunit;

[0018] The input voltage acquisition subunit is connected to the PFC circuit module and the central control module respectively, and is used to acquire the PFC input voltage signal of the PFC circuit module and transmit the PFC input voltage signal to the central control module.

[0019] Optionally, the input voltage acquisition subunit includes: a first diode, a second diode, a third resistor, and a fourth resistor;

[0020] The input terminal of the first diode is connected to the positive terminal of the voltage input terminal of the PFC circuit module, and the output terminal is connected to the first terminal of the third resistor;

[0021] The input terminal of the second diode is connected to the negative terminal of the voltage input terminal of the PFC circuit module, and the output terminal is connected to the first terminal of the third resistor;

[0022] The first end of the third resistor is connected to the output end of the first diode and the output end of the second diode, and the second end is connected to the first end of the fourth resistor and the central control module.

[0023] The first end of the fourth resistor is connected to the second end of the third resistor and the central control module, and the second end is grounded.

[0024] Optionally, the central control module includes: an object status judgment unit, a PFC status judgment unit, and a PFC signal generation unit;

[0025] The object state judgment unit is connected to the object signal acquisition unit and the PFC signal generation unit respectively, and is used to receive and judge whether the object running signal matches the object signal characteristics, generate a drive judgment signal, and send the drive judgment signal to the PFC signal generation unit.

[0026] The PFC state determination unit is connected to the modulation signal acquisition unit and the PFC signal generation unit respectively, and is used to receive and determine whether the PFC modulation signal matches the modulation signal characteristics, generate a PFC determination signal, and send the PFC determination signal to the PFC signal generation unit.

[0027] The PFC signal generation unit is connected to the object state judgment unit, the PFC state judgment unit and the PFC protection module respectively, and is used to receive the drive judgment signal and the PFC judgment signal. When it is determined that the drive judgment signal matches the object characteristic state signal and the PFC judgment signal matches the modulation characteristic signal, the unit generates the PFC control signal and sends the PFC control signal to the PFC protection module.

[0028] Optionally, the PFC status determination unit includes: a voltage calculation subunit and a voltage determination subunit;

[0029] The voltage calculation subunit is connected to the modulation signal acquisition unit and the voltage judgment subunit respectively, and is used to receive the PFC input voltage signal, determine the modulation signal characteristics according to the PFC input voltage signal and the preset boost parameters, and send the modulation signal characteristics to the voltage judgment subunit.

[0030] The voltage judgment subunit is connected to the modulation signal acquisition unit, the voltage calculation subunit, and the PFC signal generation unit, respectively, and is used to receive the PFC output voltage signal and the modulation signal characteristics, determine whether the PFC output voltage signal matches the modulation signal characteristics, and generate the PFC judgment signal.

[0031] Optionally, the central control module includes: a drive signal generation unit;

[0032] The drive signal generation unit is connected to the input voltage acquisition subunit and the PFC circuit module respectively, and is used to generate the drive control signal according to the PFC input voltage signal and send the drive control signal to the PFC circuit module.

[0033] This utility model also provides a motor system, including the drive circuit provided in any embodiment of this utility model.

[0034] As can be seen from the above, the technical solution provided by this utility model adds a PFC protection module to the drive circuit with PFC function to collect the operating status signals of the PFC circuit and the driven object and send them to the central control module. Therefore, the central control module can generate PFC control signals to control the PFC circuit according to the operating status of the PFC circuit and the driven object, thereby realizing the real-time adjustment of the PFC circuit status according to the overall status of the drive circuit, preventing large voltage and current stress from impacting the PFC chip, and reducing PFC circuit losses. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a driving circuit provided in Embodiment 1 of this utility model;

[0036] Figure 2 This is a schematic diagram of a driving circuit provided in Embodiment 2 of the present invention;

[0037] Figure 3 This is a circuit diagram of the output voltage acquisition subunit provided in Embodiment 2 of this utility model;

[0038] Figure 4 This is a circuit diagram of the input voltage acquisition subunit provided in Embodiment 2 of this utility model;

[0039] Figure 5 This is a circuit diagram of the driving circuit provided in Embodiment 2 of this utility model;

[0040] Figure 6 This is a schematic diagram of the drive circuit provided in Embodiment 2 of this utility model;

[0041] Figure 7 This is a flowchart of the central control module provided in Embodiment 2 of this utility model;

[0042] Figure 8 This is a schematic diagram of the motor system provided in Embodiment 3 of this utility model;

[0043] In the picture:

[0044] 100. Drive circuit;

[0045] 110. PFC circuit module;

[0046] 120. PFC protection module; 121. Modulation signal acquisition unit; 122. Object signal acquisition unit;

[0047] 130. Central control module;

[0048] R1, the first resistor; R2, the second resistor; R3, the third resistor; R4, the fourth resistor;

[0049] D1, first diode; D2, second diode;

[0050] 300. Motor system; 310. Drive circuit; 320. Power supply; 330. Motor. Detailed Implementation

[0051] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0052] This utility model defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up", "down", "left", "right", "inner", and "outer", are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this utility model.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] Example 1

[0056] This embodiment provides a drive circuit with its input terminal connected to a power supply, such as AC mains power or any other power supply known to those skilled in the art, and its output terminal connected to the driven object, such as a motor. This drive circuit can be used to perform PFC modulation on the power supply to improve power stability and power efficiency, thereby providing drive control with PFC functionality for the driven object.

[0057] like Figure 1 As shown, the drive circuit 100 provided in this embodiment includes a PFC circuit module 110, a PFC protection module 120, and a central control module 130.

[0058] The PFC circuit module 110 is connected to both the PFC protection module 120 and the central control module 130, and is used to perform drive control operations on the driven object of the drive circuit 100 according to the drive control signals sent by the central control module 130. The PFC protection module 120 is connected to both the PFC circuit module 110 and the central control module 130, and is used to collect the running status signals of the PFC circuit module 110 and the driven object, transmit the running status signals to the central control module 130, and perform PFC control operations according to the PFC control signals sent by the central control module 130. The central control module 130 is used to generate and send drive control signals to the PFC circuit module 110, and to generate and send PFC control signals to the PFC protection module 120 according to the running status signals.

[0059] The PFC circuit module 110 can be any circuit that can PFC modulate the input power supply and perform drive control operations on the driven object under the control of the drive control signal sent by the central control module 130. Specifically, it can include a PFC chip and any electronic components well known to those skilled in the art, such as resistors, inductors, diodes and power devices, which can realize the circuit function through series or parallel electrical connections.

[0060] The drive control signal can be an instructional electrical signal used to control the PFC circuit module 110 to control the operating state of the driven object. It can include the target operating state of the driven object, target operating parameters, and / or specific control action instructions to be performed on the driven object. It can be an analog signal, a digital signal, or a communication protocol signal. The drive control operation can be a specific control action performed on the driven object. This can be achieved by adjusting the driving object's operating parameters or start / stop state to make the driven object operate in the target operating state. Under the control of the drive control signal sent by the central control module 130, the PFC circuit module 110 can perform corresponding control actions on the driven object to control its operating state.

[0061] Optionally, the input terminal of the PFC circuit module 110 can be used as the input terminal of the drive circuit 100 and connected to the power supply. Correspondingly, the PFC circuit module 110 may specifically include a PFC boost circuit, which can realize the boost function to perform active power factor correction on the power supply.

[0062] Optionally, the output of the PFC circuit module 110 can be used as the output of the drive circuit 100 and connected to the driven object. The driven object can be a motor, such as a canned motor pump. Correspondingly, the PFC circuit module 110 may specifically include a motor inverter unit, which can invert the DC voltage output by the PFC boost circuit into three-phase AC power to provide a variable frequency and variable voltage power supply for the driven object.

[0063] Optionally, the PFC circuit module 110 can also be used to provide operating power to the central control module 130. Correspondingly, the PFC circuit module 110 may further include a power conversion unit, which can convert the DC voltage output by the PFC boost circuit into different levels of DC voltage to provide suitable operating power to the central control module 130 and the driven object respectively, so as to meet different power supply requirements.

[0064] The PFC protection module 120 can be any circuit capable of acquiring and transmitting specific circuit parameters of the PFC circuit module 110 to the central control module 130, and performing PFC control operations on the PFC circuit module 110 under the control of the PFC control signal sent by the central control module 130. Specifically, it can include any electronic components well known to those skilled in the art, such as resistors, diodes, and power devices, which are connected in series or parallel to achieve circuit functions. The PFC protection module 120 can be directly connected to the driven object, or it can be indirectly connected to the driven object through the PFC circuit module 110 to determine the operating status of the driven object and thus obtain an operating status signal.

[0065] The operating status signals of the PFC circuit module 110 and the driven object can include signals of specific circuit parameters of the PFC circuit module 110, which can reflect the respective operating status of the PFC circuit module 110 and the driven object. The operating status signals collected by the PFC protection module 120 can be transmitted to the central control module 130 through electrical connection, and can be analog signals, digital signals, or communication protocol signals.

[0066] The PFC control signal can be an instructional electrical signal used to control the PFC protection module 120 to control the operating state of the PFC circuit module 110. It can include the target operating state of the PFC circuit module 110, target operating parameters, and / or specific control action instructions to be implemented on the PFC circuit module 110. It can be an analog signal, a digital signal, or a communication protocol signal. The PFC control operation can be a specific control action implemented on the PFC circuit module 110. This can be achieved by adjusting the circuit parameters or device operating state of the PFC circuit module 110 to make it operate in the target operating state.

[0067] The PFC protection module 120 can acquire specific circuit parameters of the PFC circuit module 110, obtain operating status signals, and transmit them to the central control module 130, so that the central control module 130 generates corresponding PFC control signals. Under the control of the PFC control signals, the PFC protection module 120 can implement corresponding control actions on the PFC circuit module 110 to control the operating status of the PFC circuit module 110.

[0068] Optionally, the operating status signal may specifically include the AC power supply voltage input to the PFC circuit module 110, the DC output voltage of the PFC boost circuit of the PFC circuit module 110, and the driving current sampling of the driven object by the PFC circuit module 110.

[0069] The central control module 130 can be any circuit that performs signal processing according to preset logic rules and / or algorithms, such as an MCU (Micro Controller Unit). The central control module 130 can generate drive control signals according to preset logic rules and / or algorithms, and send these drive control signals to the PFC circuit module 110 through an electrical connection. For example, the central control module 130 can generate and send a drive control signal to control the PFC circuit module 110 to start the driven object after power is turned on.

[0070] Optionally, the central control module 130 is used to generate and send drive control signals to the PFC circuit module 110. Specifically, this may include generating and sending drive control signals to the PFC circuit module 110 based on the operating status signals. Specifically, the central control module 130 receives the operating status signals transmitted by the PFC protection module 120 according to preset logic rules and / or algorithms, determines the target operating status, target operating parameters, and / or specific control action instructions to be implemented on the driven object that match the operating status signals, generates drive control signals, and sends them to the PFC circuit module 110.

[0071] The central control module 130 can also receive the operating status signal through an electrical connection with the PFC protection module 120 according to preset logic rules and / or algorithms, determine the target operating status, target operating parameters and / or specific control action instructions to be implemented on the driven object of the PFC circuit module 110 that match the operating status signal, generate a PFC control signal and send it to the PFC protection module 120.

[0072] The driving circuit provided in this embodiment acquires the operating status signals of the PFC circuit module and the driven object through the PFC protection module, and processes the operating status signals through the central control module to generate PFC control signals for controlling the PFC circuit module. These signals are then fed back to the PFC protection module, enabling the PFC protection module to regulate the operating status of the PFC circuit module. This achieves the function of adjusting the PFC circuit status in real time according to the operating status of the driven object, avoiding increased wear or damage to the PFC circuit when the driven object is operating abnormally, and improving the reliability and lifespan of the driving circuit.

[0073] Example 2

[0074] This second embodiment further refines the above technical solution, such as... Figure 2 As shown, the PFC protection module 120 may include a modulation signal acquisition unit 121 and an object signal acquisition unit 122.

[0075] The modulation signal acquisition unit 121 is connected to the PFC circuit module 110 and the central control module 130 respectively, and is used to acquire the PFC modulation signal of the PFC circuit module 110 and transmit the PFC modulation signal to the central control module 130; the object signal acquisition unit 122 is connected to the PFC circuit module 110 and the central control module 130 respectively, and is used to acquire the object running signal of the PFC circuit module 110 and transmit the object running signal to the central control module 130.

[0076] The operating status signal may include a PFC modulation signal and an object operation signal. The PFC modulation signal may be a signal containing specific circuit parameters of the PFC circuit module 110. These specific circuit parameters can be any circuit parameters that reflect the actual modulation result of the PFC circuit module 110 performing PFC modulation on the input power supply parameters, such as the power supply voltage, circuit current, and / or power factor before and after PFC modulation. The object operation signal may be a signal containing specific circuit parameters of the PFC circuit module 110. These specific circuit parameters can be any circuit parameters in the PFC circuit module 110 that reflect the actual operating status of the driven object, such as the driving voltage and / or driving current sampled by the PFC circuit module 110 for the driven object.

[0077] The modulation signal acquisition unit 121 can acquire and transmit the PFC modulation signal to the central control module 130 through electrical connection with the PFC circuit module 110. The object signal acquisition unit 122 can acquire and transmit the object running signal to the central control module 130 through electrical connection with the PFC circuit module 110, so that the central control module 130 can generate a PFC control signal according to the PFC modulation signal and the object running signal.

[0078] By reflecting the PFC modulation effect and driving status of the driven object through the circuit parameters of the PFC circuit module, the operating status of the PFC circuit module and the driven object can be determined separately. This simplifies the signal processing of complex operating status signals, simplifies the circuit, and increases circuit reliability.

[0079] Optionally, the modulation signal acquisition unit 121 may include an output voltage acquisition subunit.

[0080] The output voltage acquisition subunit is connected to the PFC circuit module 110 and the central control module 130 respectively, and is used to acquire the PFC output voltage signal of the PFC circuit module 110 and transmit the PFC output voltage signal to the central control module 130.

[0081] The PFC modulation signal may include a PFC output voltage signal. The PFC output voltage signal can be a signal describing the output voltage of the PFC circuit module 110 after PFC modulation of the input power supply voltage. Therefore, when the target output voltage of the PFC circuit module 110 under a specific operating state is known, the operating state of the PFC circuit module 110 can be determined based on the PFC output voltage signal. The output voltage acquisition subunit acquires the PFC output voltage signal and transmits it to the central control module 130, enabling the central control module 130 to determine the operating state of the PFC circuit module 110 based on the PFC output voltage signal, thereby further generating corresponding PFC control signals.

[0082] Optionally, the PFC output voltage signal can be the output voltage after the PFC circuit module 110 performs PFC boost modulation on the input power supply voltage. When the PFC circuit module 110 is operating normally, the PFC output voltage signal can reach the boost voltage threshold; conversely, when the PFC circuit module 110 is not operating normally, the PFC output voltage signal will be lower than the boost voltage threshold. Therefore, the central control module 130 can determine whether the PFC circuit module 110 is operating normally by judging the numerical relationship between the PFC output voltage signal and the preset boost voltage threshold.

[0083] Based on the PFC modulation function of the PFC circuit module, its output voltage is used as a sampling parameter to reflect the PFC modulation effect. Thus, the operating status of the PFC circuit module can be determined based on the output voltage, which further simplifies signal processing and circuit design, improves circuit reliability, and enhances the control efficiency of the PFC circuit operating status.

[0084] Optionally, such as Figure 3 As shown, the output voltage acquisition subunit may include: a first resistor R1 and a second resistor R2.

[0085] The first end of the first resistor R1 is connected to the voltage output terminal of the PFC circuit module 110, and the second end is connected to the first end of the second resistor R2 and the central control module 130; the first end of the second resistor R2 is connected to the second end of the first resistor R1 and the central control module 130, and the second end is grounded.

[0086] The first resistor R1 and the second resistor R2 are used together to divide the output voltage of the PFC circuit module 110 and transmit the PFC output voltage signal to the central control module 130.

[0087] The first resistor R1 and the second resistor R2 are connected in series between the voltage output terminal and the ground point of the PFC circuit module 110, forming a voltage divider circuit. The voltage divider result of the output voltage of the PFC circuit module 110, acquired at the circuit connection point between the first resistor R1 and the second resistor R2, can be used as the PFC output voltage signal and transmitted to the central control module 130 via electrical connection. The above circuit design uses common electronic components for a simple circuit connection, realizing the acquisition of the output voltage of the PFC power module, resulting in a circuit with extremely high simplicity and reliability.

[0088] Optionally, the modulation signal acquisition unit 121 may include an input voltage acquisition subunit.

[0089] The input voltage acquisition subunit is connected to the PFC circuit module 110 and the central control module 130 respectively, and is used to acquire the PFC input voltage signal of the PFC circuit module 110 and transmit the PFC input voltage signal to the central control module 130.

[0090] The PFC modulation signal may also include a PFC input voltage signal. The PFC input voltage signal can be a signal describing the input voltage of the PFC circuit module 110. Therefore, based on the values ​​of the PFC input voltage signal and the PFC output voltage signal, it can be determined whether the preset PFC modulation function of the PFC circuit module 110 has been implemented, thereby determining the operating state of the PFC circuit module 110. The input voltage acquisition subunit acquires the PFC input voltage signal and transmits it to the central control module 130, enabling the central control module 130 to determine the operating state of the PFC circuit module 110 based on the PFC input voltage signal and the PFC output voltage signal, thereby further generating corresponding PFC control signals.

[0091] Optionally, when the PFC circuit module 110 is operating normally, the PFC output voltage signal and the PFC input voltage signal meet a preset value range. Conversely, when the PFC circuit module 110 is not operating normally, the PFC output voltage signal and the PFC input voltage signal cannot meet the preset value range. Therefore, the central control module 130 can determine whether the PFC circuit module 110 is operating normally by judging the value range of the PFC output voltage signal and the PFC input voltage signal.

[0092] Optionally, the PFC input voltage signal can be the input power supply voltage of the PFC circuit module 110. The PFC circuit module 110 can perform PFC boost modulation on the PFC input voltage signal, and the PFC output voltage signal can be the output voltage after the PFC circuit module 110 performs PFC boost modulation on the input power supply voltage. When the PFC circuit module 110 is operating normally, the PFC input voltage signal can reach the power supply voltage threshold, and the PFC output voltage signal can reach the boost voltage threshold. Conversely, when the PFC circuit module 110 is not operating normally, the PFC input voltage signal may not reach the power supply voltage threshold, or the PFC input voltage signal may reach the power supply voltage threshold, but the PFC output voltage signal may not reach the boost voltage threshold. Therefore, the central control module 130 can determine whether the PFC circuit module 110 is operating normally based on the PFC output voltage signal and the PFC input voltage signal.

[0093] Using both the input and output voltages of the PFC circuit module as parameters to determine its operating status can avoid the possibility of misjudging the operating status of the PFC circuit module due to abnormal output voltage caused by abnormal input voltage, thus improving the accuracy of the judgment results.

[0094] Optionally, such as Figure 4 As shown, the input voltage acquisition subunit may include: a first diode D1, a second diode D2, a third resistor R3, and a fourth resistor R4.

[0095] Specifically, the input terminal of the first diode D1 is connected to the positive terminal of the voltage input terminal of the PFC circuit module 110, and the output terminal is connected to the first terminal of the third resistor R3; the input terminal of the second diode D2 is connected to the negative terminal of the voltage input terminal of the PFC circuit module 110, and the output terminal is connected to the first terminal of the third resistor R3; the first terminal of the third resistor R3 is connected to the output terminals of the first diode D1 and the second diode D2, and the second terminal is connected to the first terminal of the fourth resistor R4 and the central control module 130; the first terminal of the fourth resistor R4 is connected to the second terminal of the third resistor R3 and the central control module 130, and the second terminal is grounded.

[0096] The first diode D1 and the second diode D2 are used to control the direction of current transmission, transmitting the input voltage of the PFC circuit module 110 to the input terminal of the third resistor R3; the third resistor R3 and the fourth resistor R4 are used together to divide the input voltage of the PFC circuit module 110, transmitting the PFC input voltage signal to the central control module 130.

[0097] The third resistor R3 is connected in parallel to the positive and negative terminals of the PFC circuit module 110's voltage input via diodes D1 and D2, respectively. The first and second diodes control the current transmission direction, ensuring that the voltage at the input terminal of the third resistor R3 is the input voltage of the PFC circuit module 110. The fourth resistor R4 is connected in series with the third resistor R3, and its other end is grounded, forming a voltage divider circuit. The voltage divider result of the input voltage of the PFC circuit module 110, acquired at the connection point between the third and fourth resistors R3, can be used as the PFC input voltage signal and transmitted to the central control module 130 via electrical connection. This circuit design uses common electronic components for a simple circuit connection, achieving the acquisition of the PFC power module's input voltage, resulting in a highly simple and reliable circuit.

[0098] like Figure 5 and Figure 6As shown, optionally, the drive object of the drive circuit 100 can be a motor, and the power supply can be AC ​​mains voltage. The PFC circuit module 110 may specifically include a filter circuit, a rectifier circuit, a PFC boost circuit, a power conversion circuit, a motor inverter circuit, and a phase current detection circuit. The PFC protection module 120 may specifically include an output voltage acquisition circuit, an input voltage acquisition circuit, and a PFC switch control circuit. The central control module 130 may specifically be an MCU.

[0099] The AC (Alternating Current) input voltage from the mains is supplied to the PFC boost circuit through a filter and rectifier circuit. The PFC boost circuit performs PFC boost modulation on the input voltage, and the output PFC DC voltage is converted into voltages suitable for the MCU and the motor through a power conversion circuit to power them respectively. Figure 6 As shown, the power conversion circuit can convert the PFC-modulated DC voltage to a 3.3V voltage to power the MCU. The power conversion circuit is also used to adjust the power supply parameters to the motor to control its speed or start / stop status.

[0100] The input voltage acquisition circuit of the PFC protection circuit 120 can be as follows: Figure 5 As shown, it is connected in parallel between the filter circuit and the rectifier circuit, or it can be connected as follows: Figure 5 The connection, not shown, is between the rectifier circuit and the PFC boost circuit.

[0101] In the PFC boost circuit, a chip voltage acquisition circuit is connected after the PFC chip to acquire the output voltage of the PFC chip and feed it back to the PFC chip, enabling the PFC chip to perform its own logic boost function regulation. The output voltage acquisition circuit of the PFC protection circuit 120 can be connected after the chip voltage acquisition circuit to acquire the PFC output voltage signal by acquiring the voltage of the chip voltage acquisition circuit.

[0102] The two ends of the PFC switch control circuit of the PFC protection circuit 120 are connected to the MUC and the PFC circuit module 110, respectively, so that the MUC can turn the PFC circuit module 110 on or off by controlling the PFC switch control circuit. Specifically, the PFC switch control circuit can be a circuit composed of a MOSFET (Metal-Oxide Semiconductor Field-Effect Transistor). Correspondingly, the PFC control signal can specifically include a PFC circuit turn-off signal, and the PFC control operation can specifically include a turn-off operation of the PFC circuit module 110 through the MOSFET.

[0103] The phase current detection circuit is connected between the motor inverter circuit and the MCU. It is used to sample the current of the motor inverter circuit and transmit it to the MCU so that the MCU can determine the motor's operating status.

[0104] The circuit described above can generate a PFC control signal to control the PFC circuit based on the operating state of the PFC circuit and the driven object, thereby realizing real-time adjustment of the PFC circuit state according to the overall state of the drive circuit.

[0105] Optionally, the central control module 130 may include: an object status judgment unit, a PFC status judgment unit, and a PFC signal generation unit.

[0106] The object status judgment unit is connected to the object signal acquisition unit 122 and the PFC signal generation unit, respectively. It is used to receive and judge whether the object running signal matches the object signal characteristics, generate a drive judgment signal, and send the drive judgment signal to the PFC signal generation unit. The PFC status judgment unit is connected to the modulation signal acquisition unit 121 and the PFC signal generation unit, respectively. It is used to receive and judge whether the PFC modulation signal matches the modulation signal characteristics, generate a PFC judgment signal, and send the PFC judgment signal to the PFC signal generation unit. The PFC signal generation unit is connected to the object status judgment unit, the PFC status judgment unit, and the PFC protection module 120, respectively. It is used to receive the drive judgment signal and the PFC judgment signal. When it is determined that the object running signal matches the object signal characteristics and the PFC modulation signal matches the modulation signal characteristics, it generates a PFC control signal and sends the PFC control signal to the PFC protection module 120.

[0107] Under the drive control operation of PFC circuit module 110, the actual operating state of the driven object varies, and the object's operating signals may have different characteristics. The object signal characteristics can be the features possessed by the object's operating signals in a specific operating state. Therefore, by determining whether the object's operating signal matches the object signal characteristics, the resulting drive judgment signal can be used to determine the operating state of the driven object.

[0108] When the PFC circuit module 110 performs PFC modulation on the input power parameters under different operating states, the PFC modulation signal can have different characteristics. The modulation signal characteristics can be the features possessed by the PFC modulation signal after the PFC circuit module 110 performs PFC modulation on the input power parameters under a specific operating state. Therefore, by determining whether the PFC modulation signal matches the modulation signal characteristics, the obtained PFC determination signal can be used to determine the operating state of the PFC circuit module 110.

[0109] Therefore, when the object running signal matches the object signal characteristics and the PFC modulation signal matches the modulation signal characteristics, the PFC signal generation unit can determine the respective running states of the driven object and the PFC circuit, and then generate corresponding PFC control signals based on their running states and send them to the PFC protection module 120.

[0110] By determining the operating status of the PFC circuit module and the driven object based on the PFC modulation signal and the object's operating signal respectively, the signal processing process for complex operating status signals can be simplified, and the reliability of the operating status determination results can be increased.

[0111] Optionally, the object state judgment unit can also be connected to the modulation signal acquisition unit 121, specifically to the input voltage acquisition subunit. It can be used to generate a drive judgment signal based on the PFC input voltage signal and send the drive judgment signal to the PFC signal generation unit.

[0112] The PFC input voltage signal reflects the operating voltage provided by the PFC circuit module 110 to the driven object. When the operating voltage is within a specific range, the operating status of the driven object can be determined. Therefore, a drive judgment signal can be generated based on the PFC input voltage signal, thereby reflecting the operating status of the driven object. Furthermore, a technical solution is proposed to control the operating status of the driven object in a timely manner based on the operating status of the PFC circuit and the driven object, improving the flexibility and effectiveness of the PFC circuit protection scheme.

[0113] Optionally, the PFC status determination unit may include a voltage calculation subunit and a voltage determination subunit.

[0114] The voltage calculation subunit is connected to the modulation signal acquisition unit 121 and the voltage judgment subunit, respectively. It is used to receive the PFC input voltage signal, determine the modulation signal characteristics based on the PFC input voltage signal and the preset boost parameters, and send the modulation signal characteristics to the voltage judgment subunit. The voltage judgment subunit is connected to the modulation signal acquisition unit 121, the voltage calculation subunit and the PFC signal generation unit, respectively. It is used to receive the PFC output voltage signal and the modulation signal characteristics, determine whether the PFC output voltage signal matches the modulation signal characteristics, and generate a PFC judgment signal.

[0115] When the PFC circuit module 110 performs PFC modulation on the input power supply, it can perform PFC boost modulation on the input power supply voltage to achieve phase matching between the power supply voltage and current, thereby improving the power factor. The preset boost parameters can be parameters describing the numerical relationship between the output voltage and the input voltage after the PFC circuit module 110 performs boost modulation. Therefore, the voltage calculation subunit can calculate based on the PFC input voltage signal and the preset boost parameters to determine the modulation signal characteristics of the PFC output voltage signal under a specific operating state. Furthermore, the voltage judgment subunit determines the operating state of the PFC circuit module 110 based on the matching between the PFC output voltage signal acquired by the modulation signal acquisition unit 121 and the modulation signal characteristics, and generates a corresponding PFC judgment signal.

[0116] Optionally, the central control module 130 may include a drive signal generation unit.

[0117] The drive signal generation unit is connected to the input voltage acquisition subunit and the PFC circuit module 110 respectively. It is used to generate drive control signals based on the PFC input voltage signals and send the drive control signals to the PFC circuit module 110.

[0118] The PFC input voltage signal reflects the operating voltage provided by the PFC circuit module 110 to the driven object. When the operating voltage of the driven object is within a specific range, it can be determined that the driven object is in a specific operating state. This operating state may include driving object operating states that pose a safety hazard to the PFC circuit module 110. Therefore, a drive control signal can be generated based on the PFC input voltage signal to perform corresponding control operations on the driven object, thereby eliminating the safety hazard caused by the driving object's operating state to the PFC circuit module 110.

[0119] Optionally, such as Figure 7 As shown, the driven object can be a water pump motor, the power supply voltage can be the mains voltage, and the central control module 130 can be used to: detect the power supply voltage through the PFC protection module 120, and if the power supply voltage is determined to be lower than the first threshold, determine whether the power supply voltage is lower than the second threshold; if the power supply voltage is determined to be lower than the second threshold, send a PFC shutdown signal to the PFC protection module 120.

[0120] The first threshold is greater than the second threshold. The first threshold is the minimum supply voltage required to ensure the normal operation of the water pump and PFC circuit, while the second threshold is the minimum supply voltage required for the water pump to operate at a reduced rate. If the supply voltage is lower than the second threshold, it indicates that the water pump is in a stopped state, and the PFC circuit needs to be shut down accordingly to prevent large voltage and current stresses from impacting the PFC chip and reduce PFC circuit losses.

[0121] The central control module 130 can also be used to send a water pump derating operation signal to the PFC circuit module 110 when it is determined that the power supply voltage is lower than the first threshold and not lower than the second threshold.

[0122] If the supply voltage is lower than the first threshold but not lower than the second threshold, the pump motor speed can be reduced accordingly to decrease the load on the PFC circuit.

[0123] The central control module 130 can also be used to: detect the boost voltage and the water pump status through the PFC protection module 120 when the power supply voltage is determined to be not lower than the first threshold; determine whether the water pump is operating normally when the boost voltage is determined to be normal; determine whether the water pump is shut down normally when the water pump is determined to be not operating normally; and send a PFC shutdown signal to the PFC protection module 120 when the water pump is determined to be shut down normally.

[0124] If the supply voltage is not lower than the first threshold, it can be determined that both the PFC circuit and the driven object can start normally. If the boost voltage is normal, it can be determined that the PFC circuit is in the starting state, and thus the operating status of the water pump can be determined. If the water pump is in the normal shutdown state, the PFC circuit can be shut down accordingly to realize the protection function of the PFC circuit.

[0125] The central control module 130 can also be used to: determine whether the water pump has stopped abnormally when it is determined that the water pump is not operating normally and has stopped abnormally; and send a PFC shutdown signal to the PFC protection module 120 when it is determined that the water pump has stopped abnormally.

[0126] If the boost voltage is normal, the PFC circuit can be determined to be in the start-up state, thus indicating the operating status of the water pump. If the water pump is in an abnormal shutdown state, the PFC circuit can be shut down accordingly, thus achieving the protection function of the PFC circuit.

[0127] The driving circuit provided in this embodiment acquires the circuit parameters of the PFC circuit module through the PFC protection module, obtains the operating status signals of the PFC circuit module and the driven object respectively, and processes the operating status signals through the central control module to generate PFC control signals for controlling the PFC circuit module. These signals are then fed back to the PFC protection module, enabling the PFC protection module to regulate the operating status of the PFC circuit module. This achieves the function of adjusting the PFC circuit state in real time according to the operating status of the driven object, avoiding increased wear or damage to the PFC circuit when the driven object is operating abnormally, and improving the reliability and lifespan of the driving circuit. At the same time, it achieves a simple circuit design and signal processing process, further improving the reliability and efficiency of the circuit.

[0128] Example 3

[0129] This third embodiment provides a motor system, including the drive circuit provided in any embodiment of this utility model. This motor system can be applied to any device known to those skilled in the art that needs to convert electrical energy into mechanical energy, such as a canned motor pump. Figure 8 As shown, the motor system 300 may include: a drive circuit 310, a power supply 320, and a motor 330.

[0130] The input terminal of the drive circuit 310 is connected to the power supply 320, and the output terminal is connected to the motor 330 to be driven. The drive circuit 310 can be used to perform PFC modulation on the power supply 320 and provide drive voltage to the motor 330. The drive circuit 310 can automatically control the PFC circuit state according to the operating state of the motor 330.

[0131] The output terminal of the power supply 320 is connected to the drive circuit 310 to provide working power to the drive circuit 310, and provides working power to the motor 330 through the PFC modulation of the drive circuit 310.

[0132] The motor 330 is connected to the output terminal of the drive circuit 310 and operates under the drive and control of the drive circuit 310.

[0133] The motor system provided in this embodiment uses a drive circuit to perform PFC modulation on the power supply to provide drive voltage for the motor operation. Based on the circuit design of the drive circuit, it detects the operating status of itself and the motor, thereby realizing the function of adjusting the PFC circuit status in real time according to the motor operating status. This avoids increasing the wear and tear or causing damage to the PFC circuit when the motor is operating abnormally, thus improving the reliability and lifespan of the motor system.

[0134] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A driving circuit, characterized in that, include: PFC circuit module, PFC protection module and central control module; The PFC circuit module is connected to the PFC protection module and the central control module respectively, and is used to perform drive control operations on the drive object of the drive circuit according to the drive control signal sent by the central control module. The PFC protection module is connected to the PFC circuit module and the central control module respectively, and is used to collect the running status signals of the PFC circuit module and the driven object, transmit the running status signals to the central control module, and perform PFC control operations according to the PFC control signals sent by the central control module. The central control module is used to generate and send the drive control signal to the PFC circuit module, and to generate and send the PFC control signal to the PFC protection module based on the operating status signal.

2. The drive circuit according to claim 1, characterized in that, The PFC protection module includes: a modulation signal acquisition unit and an object signal acquisition unit; The modulation signal acquisition unit is connected to the PFC circuit module and the central control module respectively, and is used to acquire the PFC modulation signal of the PFC circuit module and transmit the PFC modulation signal to the central control module. The object signal acquisition unit is connected to the PFC circuit module and the central control module respectively, and is used to acquire the object operation signal of the PFC circuit module and transmit the object operation signal to the central control module.

3. The drive circuit according to claim 2, characterized in that, The modulation signal acquisition unit includes: an output voltage acquisition subunit; The output voltage acquisition subunit is connected to the PFC circuit module and the central control module respectively, and is used to acquire the PFC output voltage signal of the PFC circuit module and transmit the PFC output voltage signal to the central control module.

4. The drive circuit according to claim 3, characterized in that, The output voltage acquisition subunit includes: a first resistor and a second resistor; The first end of the first resistor is connected to the voltage output terminal of the PFC circuit module, and the second end is connected to the first end of the second resistor and the central control module. The first end of the second resistor is connected to the second end of the first resistor and the central control module, and the second end is grounded.

5. The drive circuit according to claim 3, characterized by The modulation signal acquisition unit includes: an input voltage acquisition subunit; The input voltage acquisition subunit is connected to the PFC circuit module and the central control module respectively, and is used to acquire the PFC input voltage signal of the PFC circuit module and transmit the PFC input voltage signal to the central control module.

6. The drive circuit according to claim 5, characterized in that The input voltage acquisition subunit includes: a first diode, a second diode, a third resistor, and a fourth resistor; The input terminal of the first diode is connected to the positive terminal of the voltage input terminal of the PFC circuit module, and the output terminal is connected to the first terminal of the third resistor. The input terminal of the second diode is connected to the negative terminal of the voltage input terminal of the PFC circuit module, and the output terminal is connected to the first terminal of the third resistor; The first end of the third resistor is connected to the output end of the first diode and the output end of the second diode, and the second end is connected to the first end of the fourth resistor and the central control module. The first end of the fourth resistor is connected to the second end of the third resistor and the central control module, and the second end is grounded.

7. The drive circuit according to claim 5, characterized by The central control module includes: an object status judgment unit, a PFC status judgment unit, and a PFC signal generation unit; The object state judgment unit is connected to the object signal acquisition unit and the PFC signal generation unit respectively, and is used to receive and judge whether the object running signal matches the object signal characteristics, generate a drive judgment signal, and send the drive judgment signal to the PFC signal generation unit. The PFC state determination unit is connected to the modulation signal acquisition unit and the PFC signal generation unit respectively, and is used to receive and determine whether the PFC modulation signal matches the modulation signal characteristics, generate a PFC determination signal, and send the PFC determination signal to the PFC signal generation unit. The PFC signal generation unit is connected to the object state judgment unit, the PFC state judgment unit and the PFC protection module respectively, and is used to receive the drive judgment signal and the PFC judgment signal. When it is determined that the drive judgment signal matches the object feature state signal and the PFC judgment signal matches the modulation signal feature, the unit generates the PFC control signal and sends the PFC control signal to the PFC protection module.

8. The drive circuit according to claim 7, characterized in that, The PFC status determination unit includes: a voltage calculation subunit and a voltage determination subunit; The voltage calculation subunit is connected to the modulation signal acquisition unit and the voltage judgment subunit respectively, and is used to receive the PFC input voltage signal, determine the modulation signal characteristics according to the PFC input voltage signal and the preset boost parameters, and send the modulation signal characteristics to the voltage judgment subunit. The voltage judgment subunit is connected to the modulation signal acquisition unit, the voltage calculation subunit, and the PFC signal generation unit, respectively, and is used to receive the PFC output voltage signal and the modulation signal characteristics, determine whether the PFC output voltage signal matches the modulation signal characteristics, and generate the PFC judgment signal.

9. The drive circuit according to claim 5, characterized by The central control module includes: a drive signal generation unit; The drive signal generation unit is connected to the input voltage acquisition subunit and the PFC circuit module respectively, and is used to generate the drive control signal according to the PFC input voltage signal and send the drive control signal to the PFC circuit module.

10. An electric motor system characterized by, Includes the driving circuit as described in any one of claims 1-9.

Images