Universal integrated motor driving device

Abstract

The invention relates to the technical field of motor driving, and discloses a universal integrated motor driving device, which comprises an optocoupler isolation module, an integrated logic module, a power MOS (Metal Oxide Semiconductor) tube driving module, a power module and a current-limiting protection module, the optical coupler isolation module is connected with the integrated logic module; the integrated logic module is connected with the power MOS tube driving module; the power MOS tube driving module is connected with the power module; the power module is connected with a load motor; and the current-limiting protection module is connected with the power module. According to the invention, the optical coupler isolation module, the logic processing module, the MOS tube driving module and the current-limiting protection module are modularly integrated, so that the circuit design is simplified, and the reliability and maintainability of the system are improved.

Description

Technical Field

[0001] The present invention relates to the field of motor drive technology, and in particular to a universal integrated motor drive device. Background Art

[0002] At present, in the field of motor driver technology, especially for drivers for driving 2kW three-phase brushless DC motors, there are many deficiencies in the existing technology. First, most of the existing motor drivers are designed with discrete components, which have poor versatility and cannot adapt to the needs of motors of different power levels. Different power motors need to customize special drivers, which leads to complex design, long development cycle and high cost. Secondly, the electromagnetic interference shielding effect is not good. The traditional driver design uses ordinary printed circuit boards (PCBs), which are difficult to effectively suppress electromagnetic interference and affect system performance. In addition, the discrete component design leads to complex circuits, low integration, and high power consumption, which is not conducive to the miniaturization and high efficiency of the driver. At the same time, the existing design does not dissipate enough heat during the high-power motor driving process, and it is easy to overheat during long-term operation, affecting the stability and life of the equipment in high-temperature environments. More importantly, the core components used for high-power drivers in the current market, such as power MOS tubes and driver chips, rely on imports, and the supply chain is unstable, which increases costs and poses challenges to the independent controllability of products. In this context, it has become an urgent need to promote the localization, integration and generalization of motor drivers. Summary of the invention

[0003] At least one aspect or advantage of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned by practice of the disclosed subject matter.

[0004] According to one aspect of the present invention, a universal integrated motor drive device comprises:

[0005] Optocoupler isolation module, integrated logic module, power MOS tube driver module, power module and current limiting protection module;

[0006] The optical coupling isolation module is connected to the integrated logic module, and is used to transmit the input control signal to the integrated logic module for logic operation and processing after optical coupling isolation;

[0007] The integrated logic module is connected to the power MOS tube driving module and is used to transmit the driving signal generated after the logic processing to the power MOS tube driving module for amplification processing;

[0008] The power MOS tube driving module is connected to the power module and is used to transmit the amplified control signal after the amplification process to the power module;

[0009] The power module is connected to the load motor to control the operation of the motor;

[0010] The current limiting protection module is connected to the power module and is used to monitor the current of the power module and perform current protection.

[0011] According to one embodiment of the present invention, the integrated logic module includes: an integrated logic chip and a control circuit;

[0012] The control circuit is connected to the integrated logic chip to delay the output of the integrated logic chip when powered on and control the power-on sequence.

[0013] According to one embodiment of the present invention, the control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, and a third capacitor;

[0014] One end of the first resistor is connected to the supply voltage, the other end of the first resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the first capacitor, and the other end of the first capacitor is grounded;

[0015] One end of the second resistor is connected to the supply voltage, the other end of the second resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded;

[0016] One end of the third resistor is connected to the supply voltage, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded.

[0017] According to one embodiment of the present invention, the control circuit further includes a seventh resistor, an eighth resistor, a fourth capacitor, a fifth capacitor and a sixth capacitor;

[0018] One end of the seventh resistor is connected to the supply voltage, the other end of the seventh resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded;

[0019] One end of the fifth capacitor is connected to one end of the seventh resistor, and the other end of the fifth capacitor is grounded;

[0020] One end of the eighth resistor is connected to the supply voltage, the other end of the eighth resistor is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is grounded.

[0021] According to one embodiment of the present invention, the power MOS tube driving module includes a driving chip;

[0022] The driving chip includes a first hysteresis trigger and a second hysteresis trigger;

[0023] The first hysteresis trigger is connected to the HI pin of the input end of the driver chip, and is used to receive the input high-end control signal;

[0024] The second hysteresis trigger is connected to the LI pin of the input end of the driving chip, and is used for receiving an input low-end control signal.

[0025] According to one embodiment of the present invention, the power MOS tube driving module includes a driving chip;

[0026] The driver chip also includes a logic circuit, a modulator, a demodulator, a delay circuit, a pulse filter, a first undervoltage protection circuit, a second undervoltage protection circuit and an RS trigger;

[0027] The logic circuit is connected to the first hysteresis trigger and the second hysteresis trigger respectively to process the input high and low end signals;

[0028] One end of the modulator is connected to the logic circuit, and the other end of the modulator is connected to one end of the demodulator, so as to convert the logic signal into a high-voltage driving signal for driving the power MOS tube;

[0029] The delay circuit is connected to the logic circuit to receive input signals and control output timing;

[0030] The pulse filter is connected to the other end of the demodulator and is used to filter out high-frequency noise of the input signal;

[0031] The first undervoltage protection circuit is connected to the modulator, and the second undervoltage protection circuit is connected to two ends of the pulse filter;

[0032] The RS trigger is connected to the pulse filter and the second undervoltage protection circuit.

[0033] According to an embodiment of the present invention, the transmitting end of the power MOS tube driving module includes a driver, and the driver is connected to the modulator to amplify the modulated signal and transmit it to the receiving end of the power MOS tube driving module.

[0034] According to one embodiment of the present invention, the receiving end of the power MOS tube driving module includes a high-voltage isolation capacitor, a differential amplifier and a first driving circuit;

[0035] The high-voltage isolation capacitor is connected to the differential amplifier;

[0036] The differential amplifier is connected to the demodulator, and is used to receive and amplify the differential signal output from the driver and output it to the demodulator;

[0037] The first driving circuit is connected to the second undervoltage protection circuit to receive a signal from the second undervoltage protection circuit and drive the output of the high-side MOS tube.

[0038] According to one embodiment of the present invention, the power module includes a first diode, a second diode and a seventh capacitor, one end of the first diode is connected to a voltage, and the other end is connected to the seventh capacitor and the VB pin of the driving chip respectively;

[0039] The other end of the seventh capacitor is connected to one end of the second diode, and the other end of the second diode is grounded.

[0040] According to an embodiment of the present invention, the current limiting protection module includes a current sensor and an overcurrent protection circuit, and when overcurrent is detected, a protection signal is output to the integrated logic module to shut down the corresponding power MOS tube.

[0041] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0042] The present invention simplifies circuit design and improves system reliability and maintainability by modularly integrating optocoupler isolation, logic processing, MOS tube driving and current limiting protection modules.

[0043] The optical coupling isolation module of the present invention effectively isolates external signal interference and enhances the adaptability of the system in complex electromagnetic environments.

[0044] The close combination of the integrated logic module and the MOS tube driving module of the present invention significantly improves the signal processing speed and level conversion efficiency, and enhances the driving performance of the system.

[0045] The current limiting protection module of the present invention monitors the current in real time, provides automatic overcurrent protection, prevents system overload, and prolongs the life of the equipment.

[0046] The time delay and undervoltage protection designs in the control circuit of the present invention ensure the correct logic sequence when powering on, prevent the motor driver from having logic disorder, and improve the stability of system operation.

[0047] The universal packaging design of the present invention supports the driving requirements of 1kW to 2kW three-phase brushless DC motors and has strong versatility and expansibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the integrated logic module structure of a universal integrated motor drive device provided by an embodiment of the present invention;

[0049] Figure 2 EN control power supply, input and output logic diagram provided for the embodiment of the present invention;

[0050] Figure 3 A schematic diagram of the structure of a power MOS tube driving module provided by an embodiment of the present invention;

[0051] Figure 4 A block diagram of the internal system of the receiving end of the power MOS tube driving module provided by an embodiment of the present invention;

[0052] Figure 5 A block diagram of the internal system of the transmitting end of the power MOS tube driving module provided by an embodiment of the present invention;

[0053] Figure 6 This is a schematic diagram of the peripheral circuit of the driver chip provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0055] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0056] According to one embodiment of the present invention, referring to Figure 1-6 As shown, the present invention provides a universal integrated motor drive device, comprising:

[0057] Optocoupler isolation module, integrated logic module, power MOS tube driver module, power module and current limiting protection module;

[0058] The optical coupling isolation module is connected to the integrated logic module, and is used to transmit the input control signal to the integrated logic module for logic operation and processing after optical coupling isolation;

[0059] The integrated logic module is connected to the power MOS tube driving module and is used to transmit the driving signal generated after the logic processing to the power MOS tube driving module for amplification processing;

[0060] The power MOS tube driving module is connected to the power module and is used to transmit the amplified control signal after the amplification process to the power module;

[0061] The power module is connected to the load motor to control the operation of the motor;

[0062] The current limiting protection module is connected to the power module and is used to monitor the current of the power module and perform current protection.

[0063] The present invention realizes efficient motor driving function through modularization and integration, while ensuring the stability and reliability of the system in complex electromagnetic environments. Optical coupling isolation improves anti-interference ability, integrated logic module optimizes control performance, power MOS tube drive module and power module improve driving efficiency, and current limiting protection module ensures the safety and service life of the system. These designs complement each other and meet the requirements of 1kW to 2kW three-phase brushless motor drive.

[0064] According to one embodiment of the present invention, the integrated logic module includes: an integrated logic chip and a control circuit;

[0065] The control circuit is connected to the integrated logic chip to delay the output of the integrated logic chip when powered on and control the power-on sequence.

[0066] The integrated logic chip of the present invention is responsible for processing the signal from the optical coupling isolation module, performing logic operations, and generating a signal to control the power MOS tube drive module. The chip integrates multiple logic functions, can quickly and accurately process the input signal, and generate a suitable output signal according to different control requirements.

[0067] The control circuit is connected to the integrated logic chip. Its main function is to delay the output of the integrated logic chip when the system is powered on and control the power-on sequence. The control circuit is composed of several resistors and capacitors. The RC delay circuit is used to delay the chip after powering on, ensuring that all circuits are stable before starting to output signals during system startup.

[0068] According to one embodiment of the present invention, the control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, and a third capacitor;

[0069] One end of the first resistor is connected to the supply voltage, the other end of the first resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the first capacitor, and the other end of the first capacitor is grounded;

[0070] One end of the second resistor is connected to the supply voltage, the other end of the second resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded;

[0071] One end of the third resistor is connected to the supply voltage, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded.

[0072] In the present invention, by adopting the RC delay circuit, delay control is achieved by controlling the charging and discharging speed of the capacitor when power is turned on. By properly selecting the values ​​of the resistor and the capacitor, the delay of the chip output signal can be effectively controlled to ensure that the system does not mistakenly send a signal before stable operation. Through the RC delay circuit, the output signal of the integrated logic chip is controlled to be output after a certain period of time after power-on, avoiding voltage fluctuations and logical confusion at the moment of power-on. It is ensured that the system starts other modules after the power supply voltage is stable, thereby improving the stability of the overall system. Voltage fluctuations at the moment of power-on may cause the logic circuit to generate an erroneous signal. Delay processing can effectively prevent this problem and ensure that the system starts at the right time.

[0073] According to one embodiment of the present invention, the control circuit further includes a seventh resistor, an eighth resistor, a fourth capacitor, a fifth capacitor and a sixth capacitor;

[0074] One end of the seventh resistor is connected to the supply voltage, the other end of the seventh resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded;

[0075] One end of the fifth capacitor is connected to one end of the seventh resistor, and the other end of the fifth capacitor is grounded;

[0076] One end of the eighth resistor is connected to the supply voltage, the other end of the eighth resistor is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is grounded.

[0077] In the present invention, the power supply is stabilized and filtered by filtering and power stabilization circuits to prevent high-frequency noise or unstable voltage on the power supply from affecting the chip operation. By the combined design of resistors and capacitors, the spike interference and noise in the power supply voltage can be effectively filtered out to ensure the stability of the power supply. By the combination of resistors and capacitors, the high-frequency noise and voltage spikes in the power supply are filtered out to ensure the stability of the power supply. These components can ensure that the control circuit and the logic chip work in a stable power supply environment to avoid signal interference caused by power supply noise. Power supply noise or unstable voltage can affect the normal operation of the chip. The interference of noise on the signal can be significantly reduced by the filtering circuit, ensuring that the chip works under a stable voltage, thereby improving the reliability and anti-interference ability of the system.

[0078] According to one embodiment of the present invention, the power MOS tube driving module includes a driving chip;

[0079] The driving chip includes a first hysteresis trigger and a second hysteresis trigger;

[0080] The first hysteresis trigger is connected to the HI pin of the input end of the driver chip, and is used to receive the input high-end control signal;

[0081] The second hysteresis trigger is connected to the LI pin of the input end of the driver chip, and is used to receive an input low-end control signal.

[0082] The first hysteresis trigger of the present invention is connected to the HI pin of the driver chip for receiving a high-end control signal. The signal of the HI pin comes from the control logic in the integrated logic module. After passing through the hysteresis trigger, the signal is used to drive the high-side MOS tube. The function of the hysteresis trigger is to provide a delay when the input signal changes, ensuring that the high-end MOS tube is turned on or off at the right time, thereby avoiding misoperation caused by signal noise or power supply fluctuations. The second hysteresis trigger is connected to the LI pin of the driver chip for receiving a low-end control signal. The signal also comes from the integrated logic module, and after being delayed by the hysteresis trigger, it is used to drive the low-side MOS tube. Through the hysteresis processing, the low-end MOS tube can be effectively prevented from malfunctioning due to unstable input signals, ensuring stable operation of the system. The design realizes accurate delay processing of high-end and low-end control signals by integrating the first hysteresis trigger and the second hysteresis trigger in the driver chip. The use of the hysteresis trigger effectively prevents signal jitter and noise interference, improves the driving stability of the power MOS tube, and ensures that the motor drive system avoids short circuit or misoperation while running efficiently. This design greatly enhances the reliability and anti-interference ability of the system.

[0083] According to one embodiment of the present invention, the power MOS tube driving module includes a driving chip;

[0084] The driver chip also includes a logic circuit, a modulator, a demodulator, a delay circuit, a pulse filter, a first undervoltage protection circuit, a second undervoltage protection circuit and an RS trigger;

[0085] The logic circuit is connected to the first hysteresis trigger and the second hysteresis trigger respectively to process the input high and low end signals;

[0086] One end of the modulator is connected to the logic circuit, and the other end of the modulator is connected to one end of the demodulator, so as to convert the logic signal into a high-voltage driving signal for driving the power MOS tube;

[0087] The delay circuit is connected to the logic circuit to receive input signals and control output timing;

[0088] The pulse filter is connected to the other end of the demodulator and is used to filter out high-frequency noise of the input signal;

[0089] The first undervoltage protection circuit is connected to the modulator, and the second undervoltage protection circuit is connected to two ends of the pulse filter;

[0090] The RS trigger is connected to the pulse filter and the second undervoltage protection circuit.

[0091] In the present invention, the logic circuit is connected to the first hysteresis trigger and the second hysteresis trigger respectively, and is used to process the input high-end and low-end signals. The logic circuit generates corresponding driving logic according to the input high-end (HI pin) and low-end (LI pin) signals to ensure that the power MOS tube is turned on or off at the appropriate time. The logic circuit generates driving logic according to the output signal of the hysteresis trigger to ensure that the timing of the high-end and low-end signals is correct and avoid the short circuit phenomenon of the two ends being turned on at the same time.

[0092] One end of the modulator is connected to the logic circuit, and the other end is connected to the demodulator. The function of the modulator is to convert the low-level logic signal output by the logic circuit into a high-voltage drive signal suitable for driving the high-voltage power MOS tube. The demodulator restores the modulated signal to a signal that can control the MOS tube. The modulator converts the low-level logic signal into a high-voltage drive signal, and the demodulator restores it to ensure that the drive signal of the power MOS tube is suitable for high-voltage applications.

[0093] The delay circuit is connected to the logic circuit to receive the input signal and control the output timing. The delay circuit ensures that the switching timing of the power MOS tube is synchronized with the input signal and prevents incorrect conduction or shutdown caused by signal noise or instantaneous voltage fluctuations. The delay circuit ensures that the timing of the input signal is consistent with the response time of the power MOS tube, preventing signal jitter or noise from causing incorrect operation of the power MOS tube.

[0094] The pulse filter is connected to the output end of the demodulator to filter out the high-frequency noise in the demodulated signal. The function of the pulse filter is to improve the purity of the signal and ensure that the driving signal of the power MOS tube is not interfered by high-frequency noise, thereby ensuring the stable conduction and shutdown of the MOS tube. Filtering out the high-frequency noise in the signal ensures the purity of the MOS tube driving signal and improves the reliability of the MOS tube switch operation.

[0095] The first undervoltage protection circuit is connected to the modulator, and the second undervoltage protection circuit is connected to both ends of the pulse filter. The undervoltage protection circuit is used to detect whether the driving voltage is lower than the safe working voltage. If the voltage is too low, the undervoltage protection circuit will trigger the protection mechanism to prevent the power MOS tube from being damaged due to working at low voltage.

[0096] The RS trigger is connected to the pulse filter and the second undervoltage protection circuit to reset or lock the drive signal in the event of undervoltage or other abnormal conditions. The RS trigger ensures that when undervoltage or noise interference occurs, the system can respond in time and protect the power MOS tube from damage.

[0097] According to an embodiment of the present invention, the transmitting end of the power MOS tube driving module includes a driver, and the driver is connected to the modulator to amplify the modulated signal and transmit it to the receiving end of the power MOS tube driving module.

[0098] In the present invention, after receiving the logic signal from the modulator, the driver amplifies it. The modulator converts the signal output by the logic circuit into a high-voltage signal suitable for driving the high-voltage power MOS tube, and the driver further amplifies the signal to ensure that the power MOS tube can obtain sufficient driving voltage and current for efficient switching operation. The amplified high-voltage signal is transmitted to the receiving end of the power MOS tube driving module through the driver. The receiving end includes a demodulator and other circuit modules, which can demodulate and process these high-voltage signals, convert them into control signals for driving the power MOS tube, and finally control the switching action of the power MOS tube.

[0099] According to one embodiment of the present invention, the receiving end of the power MOS tube driving module includes a high-voltage isolation capacitor, a differential amplifier and a first driving circuit;

[0100] The high-voltage isolation capacitor is connected to the differential amplifier;

[0101] The differential amplifier is connected to the demodulator, and is used to receive and amplify the differential signal output from the driver and output it to the demodulator;

[0102] The first driving circuit is connected to the second undervoltage protection circuit to receive a signal from the second undervoltage protection circuit and drive the output of the high-side MOS tube.

[0103] In the present invention, the high-voltage isolation capacitor is connected to the differential amplifier to isolate the high-voltage signal. The high-voltage isolation capacitor can protect the subsequent circuit from the high voltage while transmitting the signal in the high-voltage environment, thereby ensuring the safety and stability of the signal transmission.

[0104] The differential amplifier is connected to the demodulator and is responsible for receiving the differential signal from the driver output. The differential amplifier amplifies the received signal and amplifies the small differential signal into a voltage signal suitable for the demodulator to process. This step ensures that the weak differential signal will not be affected by noise or interference during the transmission process.

[0105] The first drive circuit is connected to the second undervoltage protection circuit to receive a signal from the undervoltage protection circuit. When the undervoltage protection circuit detects that the working voltage is abnormal, it sends a signal to the first drive circuit, and the first drive circuit drives the high-side MOS tube by adjusting the output voltage to ensure that it works at a normal voltage.

[0106] According to one embodiment of the present invention, the power module includes a first diode, a second diode and a seventh capacitor, one end of the first diode is connected to a voltage, and the other end is connected to the seventh capacitor and the VB pin of the driving chip respectively;

[0107] The other end of the seventh capacitor is connected to one end of the second diode, and the other end of the second diode is grounded.

[0108] In the present invention, the power module forms a bootstrap circuit through the cooperation of the first diode, the second diode and the seventh capacitor, and effectively realizes the driving of the high-side power MOS tube. This design ensures that when the upper bridge is turned on, it can provide sufficient gate voltage to maintain the normal operation of the high-side MOS tube, and through the isolation effect of the diode, it prevents voltage reflux and ensures the safety and stability of the circuit.

[0109] In the present invention, the seventh capacitor and the first diode constitute an upper bridge driving circuit, and the selection of its parameters is related to factors such as the switching frequency f, the duty cycle D and the charging time of the parasitic capacitance of the gate of the power MOS tube.

[0110] The seventh capacitor is charged when the lower bridge arm is turned on, and when the upper bridge arm control signal is "1", the seventh capacitor is discharged to charge the gate parasitic capacitance of the power MOS tube and control the MOS to turn on; C19 can be selected according to the following formula:

[0111] C19>2Qg / (VCC-10-1.5-0.9);

[0112] Qg is the gate charge of the power MOS tube in the three-phase inverter circuit; VCC is the operating voltage of the driver chip. The actual capacitance of the seventh capacitor is 2-3 times the calculated value, and the withstand voltage is 50V.

[0113] The first diode should be able to block the high voltage on the power bus when the upper bridge power MOS tube of the motor driver is turned on. A fast recovery first diode is preferred. The current borne by the first diode is the product of the gate charge and the switching frequency. In order to reduce charge loss, a fast recovery first diode with a small reverse leakage current is preferred to reduce the feedback charge from the seventh capacitor to the power supply Vcc. The withstand voltage of the first diode is consistent with that of the power MOS tube, and its reverse recovery time trr is no more than 200ns. The forward current IF borne by the diode can be calculated according to the following formula.

[0114] IF=2Qgf+Iqbs(max)+Qlsf;

[0115] Qg is the gate charge of the power MOS tube; Iqbs(max) is the static current of the driver chip GKA2186S; Qls is the transfer charge; f is the switching frequency, that is, the PWM frequency.

[0116] According to an embodiment of the present invention, the current limiting protection module includes a current sensor and an overcurrent protection circuit, and when overcurrent is detected, a protection signal is output to the integrated logic module to shut down the corresponding power MOS tube.

[0117] In the present invention, the current limiting protection module ensures that the current of the power MOS tube is controlled in real time through the cooperation of the current sensor and the overcurrent protection circuit, and promptly shuts down the corresponding power MOS tube when overcurrent occurs to avoid damage to the circuit and components. The overcurrent protection mechanism in the design improves the safety and stability of the system, and can effectively protect the system in particular when load mutations or faults occur.

[0118] The beneficial effects of the present invention are:

[0119] The motor drive device of the present invention realizes a highly integrated design by integrating an optical coupling isolation module, an integrated logic module, a power MOS tube drive module, a power module and a current limiting protection module. Compared with the implementation of discrete components, this solution simplifies the circuit layout, reduces the number of components and wiring complexity, and improves the reliability of the system.

[0120] The present invention adopts an optical coupling isolation module to achieve signal isolation, which can effectively prevent the influence of external interference on the internal circuit, improve the electromagnetic compatibility, and is suitable for work in more complex electromagnetic environments.

[0121] The present invention performs logic operation processing on the input signal through an integrated logic module, and then transmits it to the power MOS tube driving module for signal amplification, which can achieve faster level conversion and lower delay, and improve the driving performance and response speed of the system.

[0122] The current limiting protection module of the present invention detects the working status of the power module in real time by monitoring the current. When an overcurrent condition occurs, the protection function is automatically triggered to turn off the corresponding power MOS tube to protect the circuit from damage, thereby extending the service life of the motor driver and the load motor.

[0123] The present invention avoids the logic disorder of the motor driver when it is powered on by designing the power-on sequence control and delay processing in the control circuit, thereby ensuring the stability of the system. In addition, the undervoltage protection circuit, pulse filter and delay circuit integrated in the power MOS tube drive module further improve the reliability of the system.

[0124] The technical solution of the present invention adopts a universal design, and the independence and interconnectivity between modules are good, so that the driver can adapt to the driving requirements of motors of different specifications, and is particularly suitable for multi-power three-phase brushless DC motors of 1kW to 2kW, expanding its application scenarios.

[0125] The high-voltage isolation capacitor and differential amplifier design in the power module of the present invention, combined with the optimized configuration in the drive circuit, can effectively enhance the heat dissipation effect and ensure the long-term stable operation of the motor.

[0126] Those of ordinary skill in the art will appreciate that the modules and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0127] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and equipment can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0128] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0129] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0130] In addition, each functional module in the embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0131] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the energy-saving signal sending / receiving method of each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0132] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

[0133] It should be understood that the size of the sequence number of each step in the content of the invention and the embodiments of the present invention does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention. For the purpose of example and description, the foregoing description of the implementation of the present disclosure has been given. The foregoing description is not exhaustive and is not intended to limit the present disclosure to the exact form disclosed. Various deformations and modifications may exist according to the above teachings, or various deformations and modifications may be obtained from the practice of the present disclosure. These embodiments are selected and described to illustrate the principles of the present disclosure and its practical application, so that those skilled in the art can use the present disclosure in various embodiments and various modifications suitable for the specific purpose conceived.

Claims

1. A universal integrated motor drive device, characterized in that: include: Optocoupler isolation module, integrated logic module, power MOS tube driver module, power module and current limiting protection module; The optical coupling isolation module is connected to the integrated logic module, and is used to transmit the input control signal to the integrated logic module for logic operation and processing after optical coupling isolation; The integrated logic module is connected to the power MOS tube driving module and is used to transmit the driving signal generated after the logic processing to the power MOS tube driving module for amplification processing; The power MOS tube driving module is connected to the power module and is used to transmit the amplified control signal after the amplification process to the power module; The power module is connected to the load motor to control the operation of the motor; The current limiting protection module is connected to the power module and is used to monitor the current of the power module and perform current protection.

2. A universal integrated motor drive device as claimed in claim 1, characterized in that: The integrated logic module includes: an integrated logic chip and a control circuit; The control circuit is connected to the integrated logic chip to delay the output of the integrated logic chip when powered on and control the power-on sequence.

3. A universal integrated motor drive device as claimed in claim 2, characterized in that: The control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, and a third capacitor; One end of the first resistor is connected to the supply voltage, the other end of the first resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the first capacitor, and the other end of the first capacitor is grounded; One end of the second resistor is connected to the supply voltage, the other end of the second resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; One end of the third resistor is connected to the supply voltage, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded.

4. A universal integrated motor drive device as claimed in claim 1, characterized in that: The control circuit further includes a seventh resistor, an eighth resistor, a fourth capacitor, a fifth capacitor and a sixth capacitor; One end of the seventh resistor is connected to the supply voltage, the other end of the seventh resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded; One end of the fifth capacitor is connected to one end of the seventh resistor, and the other end of the fifth capacitor is grounded; One end of the eighth resistor is connected to the supply voltage, the other end of the eighth resistor is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is grounded.

5. A universal integrated motor drive device as claimed in claim 1, characterized in that: The power MOS tube driving module includes a driving chip; The driving chip includes a first hysteresis trigger and a second hysteresis trigger; The first hysteresis trigger is connected to the HI pin of the input end of the driver chip, and is used to receive the input high-end control signal; The second hysteresis trigger is connected to the LI pin of the input end of the driving chip, and is used for receiving an input low-end control signal.

6. A universal integrated motor drive device as claimed in claim 5, characterized in that: The power MOS tube driving module includes a driving chip; The driver chip also includes a logic circuit, a modulator, a demodulator, a delay circuit, a pulse filter, a first undervoltage protection circuit, a second undervoltage protection circuit and an RS trigger; The logic circuit is connected to the first hysteresis trigger and the second hysteresis trigger respectively to process the input high and low end signals; One end of the modulator is connected to the logic circuit, and the other end of the modulator is connected to one end of the demodulator, so as to convert the logic signal into a high-voltage driving signal for driving the power MOS tube; The delay circuit is connected to the logic circuit to receive input signals and control output timing; The pulse filter is connected to the other end of the demodulator and is used to filter out high-frequency noise of the input signal; The first undervoltage protection circuit is connected to the modulator, and the second undervoltage protection circuit is connected to two ends of the pulse filter; The RS trigger is connected to the pulse filter and the second undervoltage protection circuit.

7. A universal integrated motor drive device as claimed in claim 6, characterized in that: The transmitting end of the power MOS tube driving module includes a driver, and the driver is connected to the modulator to amplify the modulated signal and transmit it to the receiving end of the power MOS tube driving module.

8. A universal integrated motor drive device as claimed in claim 7, characterized in that: The receiving end of the power MOS tube driving module includes a high-voltage isolation capacitor, a differential amplifier and a first driving circuit; The high-voltage isolation capacitor is connected to the differential amplifier; The differential amplifier is connected to the demodulator, and is used to receive and amplify the differential signal output from the driver and output it to the demodulator; The first driving circuit is connected to the second undervoltage protection circuit to receive a signal from the second undervoltage protection circuit and drive the output of the high-side MOS tube.

9. A universal integrated motor drive device as claimed in claim 6, characterized in that: The power module includes a first diode, a second diode and a seventh capacitor, one end of the first diode is connected to a voltage, and the other end is connected to the seventh capacitor and the VB pin of the driving chip respectively; The other end of the seventh capacitor is connected to one end of the second diode, and the other end of the second diode is grounded.

10. The universal integrated motor drive device according to claim 1, characterized in that: The current limiting protection module includes a current sensor and an overcurrent protection circuit. When overcurrent is detected, a protection signal is output to the integrated logic module to shut down the corresponding power MOS tube.

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