CN110932647A - Universal servo drive circuit for high-frequency alternating current and direct current motor - Google Patents
Universal servo drive circuit for high-frequency alternating current and direct current motor Download PDFInfo
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- CN110932647A CN110932647A CN201911332010.4A CN201911332010A CN110932647A CN 110932647 A CN110932647 A CN 110932647A CN 201911332010 A CN201911332010 A CN 201911332010A CN 110932647 A CN110932647 A CN 110932647A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
Abstract
The invention relates to a general servo drive circuit of a high-frequency alternating current-direct current motor, which comprises an SOC circuit, a PWM (pulse width modulation) circuit, a power supply detection circuit, a current acquisition circuit and a circular grating encoder, wherein the PWM circuit is respectively connected with a servo power supply and the motor and comprises a three-phase bridge type drive circuit which is used for modulating the servo power supply and driving the motor; the SOC circuit is connected with the PWM modulation circuit and is used for outputting a driving control signal; the signal output end of the power supply detection circuit is connected with the SOC circuit and used for detecting whether the servo power supply is electrified or not; the signal input end of the current acquisition circuit is connected with the driving input end of the motor, and the signal output end of the current acquisition circuit is connected with the SOC circuit and used for detecting the current of the armature of the motor; the circular grating encoder is connected with the SOC circuit through an interface circuit and used for collecting angular displacement data of the motor. The invention can be used for driving and controlling the alternating current motor or the direct current motor, can reduce the ripple current of the armature of the low-inductance motor and reduce the heat productivity of the motor.
Description
Technical Field
The invention relates to the technical field of servo drive control, in particular to a universal servo drive circuit for a high-frequency alternating current and direct current motor.
Background
The Permanent Magnet Synchronous Motor (PMSM) has the advantages of simple structure, low rotational inertia, high reliability and the like, and is widely applied to a servo system with high precision, high reliability and wide speed regulation range. The brush DC motor has the advantages of good starting and speed regulating performance, wide and smooth speed regulating range, strong overload capacity, small influence of electromagnetic interference and the like, and is a widely used motor at present. In the prior art, each servo control system is usually driven by aiming at a single type of motor, and the research on a general servo driving technology of a brush direct current motor and an alternating current permanent magnet synchronous motor needs to be carried out by combining the existing driving control technology.
Although the PWM type driving is most widely used, the PWM switching frequency is mostly tens of khz, and for some low inductance servo motor driving, the motor generates heat, mainly due to the low switching frequency and the large armature current ripple. Not only can the ripple current of the motor armature loop be reduced by properly increasing the switching frequency, but also the response speed of the servo control can be increased, and related research on high-speed switching frequency pulse width modulation driving technology is necessary.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a universal servo drive circuit for a high-frequency alternating current and direct current motor, which can be used for carrying out drive control on the alternating current motor and can also be used for carrying out drive control on the direct current motor; the servo control bandwidth of the servo actuator with high frequency response can be improved, the ripple current of the armature of the low-inductance motor can be reduced, and the heat productivity of the motor can be reduced.
The technical scheme for solving the technical problems is as follows:
a universal servo drive circuit for high-frequency AC/DC motor is composed of SOC circuit, PWM modulation circuit, power supply detector, current collector,
the PWM modulation circuit is arranged between a servo power supply and a motor, and comprises a three-phase bridge type driving circuit which is respectively connected with the servo power supply and the motor and is used for modulating the servo power supply and driving the motor;
the signal output end of the SOC circuit is connected with the signal input end of the PWM modulation circuit and is used for outputting a driving control signal;
the signal input end of the power supply detection circuit is connected with the servo power supply, and the signal output end of the power supply detection circuit is connected with the SOC circuit and used for detecting whether the servo power supply is powered on or not;
the signal input end of the current acquisition circuit is connected with the driving input end of the motor, and the signal output end of the current acquisition circuit is connected with the SOC circuit and used for detecting the current of the armature of the motor;
further, still include the circle grating encoder, the circle grating encoder sets up on the motor, the signal output part of circle grating encoder connects the SOC circuit is used for gathering the angular displacement volume data of motor.
Furthermore, the PWM modulation circuit further comprises an isolation circuit, a signal input end of the isolation circuit is connected with a signal output end of the SOC circuit, a signal output end of the isolation circuit is connected with a control end of the three-phase bridge type driving circuit, an input end of the three-phase bridge type driving circuit is connected with the servo power supply, and an output end of the three-phase bridge type driving circuit is connected with a driving input end of the motor.
Furthermore, the PWM modulation circuit includes three isolation circuits and two three-phase bridge driving circuits, each of the isolation circuits is provided with two signal output terminals, each of the three-phase bridge driving circuits includes six single-phase bridge driving circuits connected in parallel, two signal output terminals of each of the isolation circuits are respectively and correspondingly connected to control terminals of the two single-phase bridge driving circuits, and the PWM modulation circuit can be used for driving two sets of motors at the same time.
Further, the three-phase bridge type driving circuit is composed of MOSFETs.
Further, the current acquisition circuit comprises a current sensor and an A/D conversion circuit, the signal input end of the current sensor is connected with the driving input end of the motor, the signal output end of the current sensor is connected with the signal input end of the A/D conversion circuit, and the signal output end of the A/D conversion circuit is connected with the signal input end of the SOC circuit.
The output end of the interface circuit is connected with the signal input end of the SOC circuit, and the input end of the interface circuit is used for providing data acquisition and information interaction.
Further, the interface circuit comprises a level conversion interface circuit, an RS422 serial port circuit, a BISS data interface circuit and an analog voltage following circuit, wherein the level conversion interface circuit, the RS422 serial port circuit and the BISS data interface circuit are respectively connected with the signal input end of the SOC circuit, and the analog voltage following circuit is connected with the signal input end of the A/D conversion circuit.
Further, the SOC circuit includes a processor and a logic resource module, which are in signal connection with each other, the logic resource module is used for providing a peripheral interface and performing data acquisition, and the processor is used for performing operation on the acquired data and outputting a control signal.
The invention has the beneficial effects that: the high-frequency alternating current and direct current universal servo drive circuit can be used for driving and controlling an alternating current motor and can also be used for driving and controlling a direct current motor; the controller can simultaneously complete the drive control of two paths of alternating current permanent magnet synchronous motors or the drive control of two paths of direct current motors, and the SOC circuit (namely the controller) outputs different switching signal combinations to the PWM modulation circuit to realize the switching control function of the alternating current permanent magnet synchronous motors or the direct current motors. The invention can improve the servo control bandwidth of the servo actuator with high frequency response, reduce the ripple current of the armature of the low-inductance motor and reduce the heat productivity of the motor.
Drawings
FIG. 1 is a block diagram of the system components of the present invention;
FIG. 2 is a schematic diagram of a three-phase bridge driver circuit according to the present invention;
FIG. 3 is a schematic diagram of an isolation circuit of the present invention;
FIG. 4 is a schematic diagram of a single-phase bridge driving circuit according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. SOC circuit, 1.1, the treater, 1.2, logic resource module, 2, power detection circuitry, 3, PWM modulation circuit, 3.1, three-phase bridge type drive circuit, 3.2, isolation circuit, 4, the current acquisition circuit, 4.1, current sensor, 4.2, AD converting circuit, 5, interface circuit, 5.1, level conversion interface circuit, 5.2, RS422 serial circuits, 5.3, BISS data interface circuit, 5.4, analog voltage follow circuit, 6, servo power supply, 7, the motor, 8, circular grating encoder.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in figure 1, the universal servo drive circuit for the high-frequency AC/DC motor comprises an SOC circuit 1, a PWM (pulse width modulation) circuit 3, a power supply detection circuit 2 and a current acquisition circuit 4,
the PWM modulation circuit 3 is arranged between a servo power supply 6 and a motor 7, the PWM modulation circuit 3 comprises a three-phase bridge type driving circuit 3.1, and the three-phase bridge type driving circuit 3.1 is respectively connected with the servo power supply 6 and the motor 7 and is used for modulating the servo power supply 6 and driving the motor 7;
the signal output end of the SOC circuit 1 is connected with the signal input end of the PWM modulation circuit 3 and is used for outputting a driving control signal;
the signal input end of the power supply detection circuit 2 is connected with the servo power supply 6, and the signal output end of the power supply detection circuit 2 is connected with the SOC circuit 1 and used for detecting whether the servo power supply 6 is powered on or not;
the signal input end of the current acquisition circuit 4 is connected with the driving input end of the motor 7, and the signal output end of the current acquisition circuit 4 is connected with the SOC circuit 1 and used for detecting the current of a motor armature;
this embodiment still includes circular grating encoder 8, circular grating encoder 8 sets up on the motor 7, circular grating encoder 8's signal output part connects SOC circuit 1's signal input part is used for gathering motor 7's angular displacement volume data and feedback extremely SOC circuit 1.
As shown in fig. 1, the SOC circuit 1 includes a processor 1.1 and a logic resource module 1.2, which are in signal connection with each other, the logic resource module 1.2 is used for providing a peripheral interface and performing data acquisition, and the processor 1.1 is used for performing operation on acquired data and outputting a control signal.
In this embodiment, the PWM modulation circuit 3 further includes an isolation circuit 3.2, a signal input terminal of the isolation circuit 3.2 is connected to a signal output terminal of the SOC circuit 1, a signal output terminal of the isolation circuit 3.2 is connected to a control terminal of the three-phase bridge driving circuit 3.1, an input terminal of the three-phase bridge driving circuit 3.1 is connected to the servo power supply 6, and an output terminal of the three-phase bridge driving circuit 3.1 is connected to a driving input terminal of the motor 7.
In this embodiment, the PWM modulation circuit 3 includes three isolation circuits 3.2 and two three-phase bridge driving circuits 3.1, each isolation circuit 3.2 is provided with two signal output terminals, two three-phase bridge driving circuits 3.1 include six single-phase bridge driving circuits connected in parallel, two signal output terminals of each isolation circuit 3.2 are respectively and correspondingly connected to control terminals of the two single-phase bridge driving circuits, and the PWM modulation circuit 3 can be simultaneously used for driving and controlling two sets of motors 7.
Further, the three-phase bridge driving circuit 3.1 is composed of MOSFETs.
In this embodiment, the current collection circuit 4 includes a current sensor 4.1 and an a/D conversion circuit 4.2, a signal input end of the current sensor 4.1 is connected with a driving input end of the motor 7, a signal output end of the current sensor 4.1 is connected with a signal input end of the a/D conversion circuit 4.2, and a signal output end of the a/D conversion circuit 4.2 is connected with a signal input end of the SOC circuit 1.
In this embodiment, the driving circuit further includes an interface circuit 5, an output end of the interface circuit 5 is connected to a signal input end of the SOC circuit 1, and an input end of the interface circuit 5 is used for providing data acquisition and information interaction.
Specifically, interface circuit 5 includes level conversion interface circuit 5.1, RS422 serial ports circuit 5.2, BISS data interface circuit 5.3, analog voltage follower circuit 5.4, level conversion interface circuit 5.1 RS422 serial ports circuit 5.2 BISS data interface circuit 5.3 respectively with SOC circuit 1's signal input part is connected, analog voltage follower circuit 5.4 with AD converting circuit's signal input part is connected.
More specifically, the high-frequency servo drive control circuit of the present embodiment integrates multiple functions such as servo control, servo drive, analog signal input control, I/O interface input, BISS data processing, servo power detection, serial port transceiving, and the like, and a block diagram of the high-frequency ac/dc general servo drive control circuit is shown in fig. 1. The circuit comprises an SOC circuit 1, a power supply detection circuit 2, a PWM modulation circuit 3, a current acquisition circuit 4, an interface circuit 5 and the like.
The full-digital alternating current servo driver based on the SOC chip realizes the design of a driving circuit with high-speed switching frequency, the switching frequency can reach 100KHz, the control period of a current loop can reach within 10 microseconds, the ripple current of a motor is reduced, the servo control response speed is improved, and the driving control function of an alternating current permanent magnet synchronous motor and a direct current servo motor can be realized.
The SOC circuit 1 is a core component of the servo drive control circuit, mainly completes the implementation of control algorithm, interface information and data processing, upper computer communication and other work, and is a carrier for the implementation of the control strategy of the whole system. The processor 1.1 selects an SOC chip XC7Z010 of XILINX company, and the XC7Z010 integrates an ARM A9 processor 1.1 (see a PS part in figure 1) and a logic resource module 1.2 (see a PL part in figure 1), the processor 1.1 only performs servo closed-loop control, and the logic resource module 1.2 is equivalent to an FPGA function and is used for providing a peripheral interface and a data acquisition function. The logic resource module 1.2 can process data in parallel, can complete the functions of angular displacement data processing, A/D data sampling, interface signal reading and serial port expansion collected by the circular grating at the same time, and can exchange data with the processor 1.1 through a 32-bit AXI interface.
More specifically, in this embodiment, the SOC circuit 1 selects XC7Z010 of XILINX corporation, and integrates the dual-core ARM a9 processor 1.1 and the programmable logic resource module 1.2, so that not only is the flexibility and expandability of the FPGA provided, but also the operation function of the processor 1.1 is provided, and the dominant frequency can reach 766 MHz. In order to ensure the operation speed and the control performance, the processor 1.1 only carries out servo closed-loop control, and the peripheral interface and the data acquisition function are completed through the logic resource module 1.2.
The data exchange between the processor 1.1(PS part) of the SOC circuit 1 and the logic resource block 1.2(PL part) is based on the AXI bus high speed interconnect, with very low latency and very advantageous for short cycle servo control. The servo control loop comprises a position loop, a speed loop and a current loop, wherein the speed of the current loop is highest, the closed loop period can reach within 10 mu s, the current sampling frequency participating in the calculation of the current loop can reach 250ksps, and the requirement of a data refresh rate is met. The current loop control output is directly reflected on the duty ratio of the switching frequency, and the requirement of the fastest current loop data output updating rate can be met when the switching frequency is 100 kHz.
The processor 1.1(PS part) completes the control of three servo loops, and then sends the operation result to the logic resource module 1.2(PL part) through the AXI bus, and the logic resource module 1.2(PL part) completes the logic functions of PWM direct current conversion or PWM alternating current inversion and the like. Because the logic resource module 1.2(PL part) can process data in parallel, the functions of A/D sampling, angle measurement position calculation and speed calculation, the interface circuit 5, serial port expansion and the like can be completed simultaneously. The logical resource block 1.2(PL part) transmits data to the processor 1.1(PS part) over the bus for computation. The logic resource module 1.2(PL part) exchanges data with the processor 1.1(PS part) once in each current loop control period, and the real-time performance of the data is guaranteed.
The power detection circuit 2 is used for detecting whether the servo power supply 6 is powered on, and after the servo power supply 6 is switched on, the power detection circuit is connected to the input end of the optical coupler through the current-limiting resistor to drive the optical coupler to output a low-level signal, and after the servo power supply 6 is switched off, the optical coupler outputs a high-level signal. The optocoupler adopts a TLP785 optocoupler, isolates a power supply and a control part, the output is connected with the level conversion chip, and finally the power-on state and the power-off state of the servo power supply 6 can be judged through an interface of the logic resource module 1.2(PL part). The processor 1.1(PS part) reads the state of the servo power supply 6 before the servo closed-loop control starts, the closed-loop control can be performed only after the servo power supply 6 is powered on, and the servo closed-loop control is stopped after the servo power supply 6 is turned off, thereby protecting the servo system.
The PWM modulation circuit 3 includes: three-phase bridge type drive circuit 3.1 and isolating circuit 3.2 by MOSFET constitution, isolating circuit 3.2 is magnetic isolation circuit 3.2. The processor 1.1 outputs PWM control signals to the MOSFET high-low side driving circuit through the magnetic isolation circuit 3.2, the MOSFET high-low side driving circuit directly drives the MOSFET switch circuit to realize DC voltage PWM conversion, and when the AC permanent magnet synchronous motor 7 is driven and controlled, the three-phase bridge type driving circuit 3.1 inverts a DC power supply into three-phase AC output; when the dc servo motor 7 is driven and controlled, two phases of the three-phase bridge driving circuit 3.1 convert the dc power into PWM driving signals with duty ratio proportional to the input. As shown in fig. 2-4, each three-phase bridge driver circuit 3.1 is mainly composed of 6 high-speed MOSFETs, 6 sets of RCD buffer circuits, and 3 high-low side driver circuits. The isolation circuit 3.2 mainly realizes the functions of electrical isolation and level conversion between the low-voltage control circuit and the power drive circuit, the connection between the low-voltage control circuit and the power drive circuit is mainly a PWM control signal, the isolation output and level conversion of the PWM signal are realized through a magnetic isolation chip in the magnetic isolation circuit 3.2, and meanwhile, the low-voltage control circuit and the power drive circuit are separated in physical position during PCB wiring, so that the distance of the low-voltage control circuit and the power drive circuit at least reaches the creepage distance required by electrical safety.
As shown in fig. 3, the isolation circuit 3.2 uses an ADuM7440 isolation chip, the ADuM7440 is a four-channel isolation signal chip, and the maximum frequency can reach 25 MHz. ADuM7440 uses ADI magnetic isolation techniques, which combine high-speed CMOS with monolithic air-core transformer technology to provide superior performance characteristics over optocoupler devices and other integrated couplers. Each model number provides an input glitch filter to prevent interference from extraneous noise. The input signal is directly connected with the SOC chip signal, the voltage is 3.3V, the output is directly connected with the power driving module (namely the three-phase bridge type driving circuit 3.1), the output voltage is 5V, and the input end and the output end are electrically isolated by supplying power through an external isolation power supply. The ADuM7440 is 4-channel output, 3 ADuM7440 is used for realizing the isolated output of 12 paths of PWM control signals, the drive control of two paths of alternating current permanent magnet synchronous motors 7 or direct current servo motors 7 can be realized simultaneously, and an isolation circuit 3.2 is shown in figure 3.
As shown in fig. 2 and 4, the three-phase bridge drive circuit 3.1 includes a MOSFET drive portion and a MOSFET switch converter circuit portion. The drive circuit adopts IR2010S of the English flying company, the high-side drive voltage can reach 200V, and the requirement of the servo drive voltage can be met. IR2010S may receive 3.3V or 5V logic input control signals enabling simultaneous high and low side driving. The IR2010S is a high-voltage, high-power, high-speed MOSFET driver chip, and is mainly used for driving an inverter circuit and a dc motor 7. The IR2010S is output for 95ns when being turned on, 65ns when being turned off, 10ns when being raised and 15ns when being lowered, the driving output current is up to 3.0A, and the requirement of switching frequency driving is met. 6 pieces of IR2010S were used for driving two sets of three-phase bridge circuits of 12 MOSFETs. The MOSFET switch conversion circuit adopts 12 MOSFETs to form two groups of three-phase bridge circuits (six single-phase bridge driving circuits arranged in parallel), and realizes the driving control of the two paths of alternating current permanent magnet synchronous motors 7 or the direct current servo motor 7. As shown in fig. 4, each MOSFET has an RCD snubber circuit for reducing the influence of the surge current on the circuit, and the RCD snubber circuit is composed of a fast recovery diode, a snubber capacitor, and an absorption resistor.
The MOSFET adopts IPI 076N15N5 of England flying company, the on-resistance of the IPI 076N15N5 is 7.6m omega, the on-time and the off-time are very short, and the MOSFET can be used for pulse width modulation with high switching frequency. A group of three-phase bridge PWM driving circuits is shown in fig. 4, when used for driving the ac motor 7, M1, M2, M3 in fig. 4 are respectively connected to three input terminals of the motor 7, and output three-phase ac voltage by vector transformation of the controller; when the driving circuit is used for driving the direct current motor 7, two of the M1, the M2 and the M3 are used for connecting two input ends of the direct current motor 7, and two MOSFETs connected with the other one are all turned off to form a PWM direct current bridge type driving circuit. The circuit can meet the driving requirements of the motor 7 with the maximum voltage of 100V and the maximum current of 20A.
The current collection circuit 4 includes: a current sensor 4.1 circuit part and an a/D conversion circuit 4.2 part. The current sensor 4.1 is used to detect the actual current in the stator winding of the motor 7, so as to realize the design of the current closed-loop control and current protection circuit. The current detection circuit of the embodiment adopts the Hall current sensor 4.1CASR 15-NP, converts a magnetic signal generated by current into an electric signal according to the Hall principle by utilizing the Hall effect of the Hall sensor, realizes the signal electrical isolation of the driving part and the control part, and has strong anti-interference performance and high precision. In the embodiment, two phase output currents in the alternating current servo drive need to be collected by using the two current sensors 4.1, and only one current sensor 4.1 is needed for the direct current servo drive, so that the two current sensors 4.1 can meet the requirement of alternating current or direct current motor 7 for driving current closed loop. The current sensor 4.1 can be used not only for current closed loop but also for current overcurrent protection function. The current sensor 4.1 outputs a voltage signal proportional to the current, and then the voltage is sampled by AD7656 of ADI company, the current sampling frequency can reach 250ksps, and the requirement of 100KHz switching frequency data refresh rate is met. The A/D conversion circuit 4.2 is mainly used for sampling the output voltage value of the current sensor 4.1 and the input voltage value of the analog input interface.
The interface circuit 5 includes: level conversion interface circuit 5.1, RS422 serial port circuit 5.2, BISS data interface circuit 5.3 and analog voltage follower circuit 5.4. In this embodiment, all the interface circuits 5 are implemented by the logic resource module 1.2(PL portion) of the SOC chip, so that the processor 1.1(PS portion) resources are not occupied, and the implementation of the fast operation cycle is ensured. The level conversion interface circuit 5.1 is implemented by a level conversion chip SN74LVC8T245 with a tri-state output, and is mainly used for receiving an external I/O indication signal, and is also used for buffering an optical coupling output signal in the power supply detection circuit 2. The logic resource module 1.2 of the SOC circuit 1 is connected with a level conversion chip, and an external interface of the level conversion chip is 5V TTL level and is set as input. The RS422 serial port circuit 5.2 completes the corresponding level conversion through a dedicated serial port chip, and the serial port protocol is completed through a logic resource module 1.2 of the SOC circuit 1. The BISS data interface level signal is compatible with the RS422 serial port level signal in size, so the same interface chip can be adopted, and the BISS data acquisition protocol is completed through a logic resource module 1.2 of the SOC circuit 1. The BISS data interface circuit 5.3 mainly realizes reading of angle measurement data of the circular grating encoder 8, and the BISS bus protocol is a synchronous serial transmission protocol. The RS422 serial port and the BISS interface of the circuit both adopt ADI chips ADM2582, the ADM2582 comprises an integrated isolated DC/DC power supply, an external isolated power supply module is not needed any more, and the circuit is an enhanced RS422 transceiver with isolation. The analog voltage follower circuit 5.4 adopts an operational amplifier to form a voltage follower, and then the input voltage is sent to the logic resource module 1.2 of the SOC circuit 1 through the A/D conversion circuit 4.2 to complete the analog signal input function. The analog voltage follower circuit 5.4 is used for receiving an external control signal, the analog input voltage is +/-10V, the analog input is subjected to low-pass filtering and then input into the voltage follower circuit consisting of the operational amplifier, and the output is directly connected to the A/D conversion chip.
The invention has the beneficial effects that: the high-frequency alternating current and direct current universal servo drive circuit can be used for driving and controlling the alternating current motor 7 and can also be used for driving and controlling the direct current motor 7; the drive control of two paths of alternating current permanent magnet synchronous motors 7 or the drive control of two paths of direct current motors 7 can be simultaneously completed, and different switch signals are output to the PWM modulation circuit 3 through the SOC circuit 1 (namely, a controller) to realize the switching control function of the alternating current permanent magnet synchronous motors 7 or the direct current motors 7. The invention can improve the servo control bandwidth of the servo actuator with high frequency response, and simultaneously can reduce the ripple current of the armature of the low inductance motor 7 and reduce the heat productivity of the motor 7.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A universal servo drive circuit for a high-frequency AC/DC motor is characterized by comprising an SOC circuit (1), a PWM (pulse width modulation) circuit (3), a power supply detection circuit (2) and a current acquisition circuit (4),
the PWM modulation circuit (3) is arranged between a servo power supply (6) and a motor (7), the PWM modulation circuit (3) comprises a three-phase bridge type driving circuit (3.1), and the three-phase bridge type driving circuit (3.1) is respectively connected with the servo power supply (6) and the motor (7);
the signal output end of the SOC circuit (1) is connected with the signal input end of the PWM modulation circuit (3);
the signal input end of the power supply detection circuit (2) is connected with the servo power supply (6), and the signal output end of the power supply detection circuit (2) is connected with the SOC circuit (1);
the signal input end of the current acquisition circuit (4) is connected with the driving input end of the motor (7), and the signal output end of the current acquisition circuit (4) is connected with the SOC circuit (1).
2. The high-frequency alternating current and direct current motor universal servo drive circuit is characterized by further comprising a circular grating encoder (8), wherein the circular grating encoder (8) is arranged on the motor (7), and a signal output end of the circular grating encoder (8) is connected with the SOC circuit (1).
3. The high-frequency universal servo drive circuit for the alternating current and direct current motor is characterized in that the PWM modulation circuit (3) further comprises an isolation circuit (3.2), a signal input end of the isolation circuit (3.2) is connected with a signal output end of the SOC circuit (1), a signal output end of the isolation circuit (3.2) is connected with a control end of the three-phase bridge drive circuit (3.1), an input end of the three-phase bridge drive circuit (3.1) is connected with the servo power supply (6), and an output end of the three-phase bridge drive circuit (3.1) is connected with a drive input end of the motor (7).
4. The universal servo drive circuit for high-frequency alternating current and direct current motors as claimed in claim 3, wherein the PWM modulation circuit (3) comprises three isolation circuits (3.2) and two three-phase bridge drive circuits (3.1), each isolation circuit (3.2) is provided with two signal output ends, the two three-phase bridge drive circuits (3.1) comprise six single-phase bridge drive circuits arranged in parallel, and the two signal output ends of each isolation circuit (3.2) are respectively connected with the control ends of the two single-phase bridge drive circuits.
5. A high frequency ac/dc motor universal servo drive circuit according to claim 1, characterized in that the three-phase bridge drive circuit (3.1) is composed of MOSFETs.
6. The universal servo drive circuit for the high-frequency alternating current and direct current motor is characterized in that the current acquisition circuit (4) comprises a current sensor (4.1) and an A/D conversion circuit (4.2), a signal input end of the current sensor (4.1) is connected with a drive input end of the motor (7), a signal output end of the current sensor (4.1) is connected with a signal input end of the A/D conversion circuit (4.2), and a signal output end of the A/D conversion circuit (4.2) is connected with a signal input end of the SOC circuit (1).
7. The universal servo drive circuit for the high-frequency alternating current and direct current motor is characterized by further comprising an interface circuit (5), wherein an output end of the interface circuit (5) is connected with a signal input end of the SOC circuit (1), and an input end of the interface circuit (5) is used for providing data acquisition and information interaction.
8. The universal servo drive circuit for the high-frequency alternating current and direct current motor is characterized in that the interface circuit (5) comprises a level conversion interface circuit (5.1), an RS422 serial port circuit (5.2), a BISS data interface circuit (5.3) and an analog voltage follower circuit (5.4), wherein the level conversion interface circuit (5.1), the RS422 serial port circuit (5.2) and the BISS data interface circuit (5.3) are respectively connected with a signal input end of the SOC circuit (1), and the analog voltage follower circuit (5.4) is connected with a signal input end of the A/D conversion circuit (4.2).
9. The high-frequency alternating current and direct current motor universal servo driving circuit is characterized in that the SOC circuit (1) comprises a processor (1.1) and a logic resource module (1.2) which are in signal connection with each other, the logic resource module (1.2) is used for providing a peripheral interface and performing data acquisition, and the processor (1.1) is used for performing operation on acquired data and outputting a control signal.
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| CN201911332010.4A CN110932647A (en) | 2019-12-21 | 2019-12-21 | Universal servo drive circuit for high-frequency alternating current and direct current motor |
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| CN201911332010.4A CN110932647A (en) | 2019-12-21 | 2019-12-21 | Universal servo drive circuit for high-frequency alternating current and direct current motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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