CN109167552B - Fluid circuit circulating pump driver - Google Patents

Fluid circuit circulating pump driver Download PDF

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Publication number
CN109167552B
CN109167552B CN201811063501.9A CN201811063501A CN109167552B CN 109167552 B CN109167552 B CN 109167552B CN 201811063501 A CN201811063501 A CN 201811063501A CN 109167552 B CN109167552 B CN 109167552B
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module
voltage
driver
motor
circuit
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CN109167552A (en
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吕宏宇
管洪飞
张璐
刘翠红
郭栋
刘荣辉
郭林
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Technology and Engineering Center for Space Utilization of CAS
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Technology and Engineering Center for Space Utilization of CAS
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses a fluid loop circulating pump driver, and relates to the field of aerospace engineering. The driver is suitable for driving a fluid circuit circulation pump motor, and comprises: the digital-to-analog conversion module is used for acquiring a digital control signal for controlling the rotating speed of the circulating pump motor, converting the digital control signal into an analog control signal, modulating the pulse width of the analog control signal by the analog control module to generate a driving signal, and amplifying the power of the driving signal by the driving module and sending the driving signal to the circulating pump motor. The driver provided by the invention does not contain a microprocessor for immunizing a space environment at high cost, adopts a pure analog circuit control mode in the driver, has wide speed regulation range and high rotation speed stability, has strong simple anti-interference capability for an external digital control interface circuit, and meets the electromagnetic compatibility requirement.

Description

Fluid circuit circulating pump driver
Technical Field
The invention relates to the field of aerospace engineering, in particular to a fluid loop circulating pump driver.
Background
In the space station engineering project, the fluid loop runs through a circulating pump in the system, and distributes working medium flow for temperature control to each experiment cabinet and equipment through adjustment of a regulating valve, so that the temperature of each experiment cabinet and equipment is maintained within an allowable range, and normal operation and function realization of space application load are ensured. While the circulation pump driver is the core power component of the fluid circuit, the reliability of the circulation pump driver has a direct impact on the reliability of the fluid circuit, even the reliability of the whole space application system.
The existing motor driver for the ground cannot be directly applied in a space environment, and the driver designed for space products in the industry is usually fixed rotation speed or rotation speed stepped adjustment, so that expansibility of a space application system is lacking; the driver capable of continuously adjusting the rotation speed is generally designed based on a microprocessor (DSP or FPGA), the cost of selecting a microprocessor insensitive to the space environment is very high, and the chip area and peripheral circuits can lead the driver not to reduce the volume to realize miniaturization; in addition, the interfaces of the common drivers are all analog quantity control easy to be disturbed, and cannot meet the high reliability requirement of aerospace application.
Disclosure of Invention
The invention aims to solve the technical problem of providing a small-sized high-reliability circulating pump driver which can be used in a space environment aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
a fluid circuit circulation pump driver for driving a circulation pump motor, comprising:
the digital-to-analog conversion module, the analog control module and the driving module are sequentially connected; the driving module is connected with the circulating pump motor; the analog control module includes: the motor control chip is respectively connected with the Hall interface circuit, the rotating speed soft start circuit, the error correction regulating circuit and the current sampling circuit, the Hall interface circuit is connected with the circulating pump motor, the current sampling circuit is connected with the driving module, and the motor control chip is also respectively connected with the digital-to-analog conversion module and the driving module;
the digital-to-analog conversion module is used for obtaining a digital control SPI interface signal for controlling the rotating speed of the circulating pump motor externally, converting the digital control signal into an analog control signal, adding an impedance matching and amplitude limiting protection circuit after the conversion circuit, and the conversion formula of the digital-to-analog conversion module is as follows:
Uref＝2*REF*Data/4096；
The voltage output of the digital-to-analog conversion module is Uref, the internal reference voltage value of the digital-to-analog conversion chip is REF, the Data is a register value set by the SPI interface and representing expected control rotating speed, the driver controls the SPI interface to refresh the contents REF and Data of the control registers at regular time, and the refresh time interval is between 500ms and 1s according to the response characteristic of the motor;
the simulation control module is used for obtaining the real-time rotating speed of the circulating pump motor according to the Hall signal of the circulating pump motor, performing speed closed-loop control on the circulating pump motor according to the circuit sampling circuit, the target rotating speed set outside and the current real-time rotating speed, generating a driving signal and sending the driving signal to the driving module;
the motor control chip is used for generating PWM chopping frequency, the chopping frequency f is set by external resistance and capacitance, and the formula is:
f＝2/(R osc *C osc )；
wherein R is osc The resistance value of the chopping frequency is set to be between 10kΩ and 100kΩ, C osc Setting a capacitance value of chopping frequency, wherein the capacitance value is between 1nF and 100 nF; setting the voltage of the post-chopping frequency signal as sawtooth wave, the peak value as 1.2V and the DC offset as 1.6V;
the Hall interface circuit is used for acquiring a Hall signal output by the circulating pump motor, and the Hall signal acquisition path is connected in series with the noise absorption circuit, so that the operation interference noise of the motor is filtered, and the phase-change operation of the driver is stable;
The current sampling circuit is used for obtaining sampling current output by the driving module in each control period, the resistance value of the sampling resistor Rs is between 10mΩ and 20mΩ, and RC low-pass filtering is carried out; pulse width adjustment is carried out in each PWM control period according to the magnitude of the feedback current, so that cycle-by-cycle current control is realized, three-phase current fluctuation is stabilized, and the driver is prevented from being burnt due to overlarge current;
the error correction and adjustment circuit is used for setting the rotation speed limit range, the rotation speed stability and the response time of the circulating pump motor; the rotating speed soft start circuit is used for realizing the rotating speed soft start of the driver, so that the rotating speed slowly rises after the driver is normally started or under-voltage overcurrent protection is restarted, and the current and voltage impact caused by the given speed mutation is reduced;
the closed-loop control expression of the analog control module is as follows:
U n ＝5*τ/Period；
τ＝0.67R T *C T ＝0.5*Period；
Period＝20/(RPM max *N poles )；
wherein U is c For the output of the error-correcting regulating circuit, U ref For voltage output of D/A conversion module, U n For the feedback voltage value proportional to the real-time rotation speed of the motor, τ is the time constant of the monostable trigger for collecting the Hall signal, R T Setting resistance of 10-500 k omega for setting commutation interval, C T To set the commutation interval for a set capacitance, the capacitance value is between 1nF and 100nF, period is the motor interval time, RPM max For the highest rotation speed of the motor, N poles Is the pole pair number of the motor.
The beneficial effects of the invention are as follows: the invention provides a fluid loop circulating pump driver which can be applied to a space environment, a digital control signal is converted by a digital-to-analog conversion module, a driving signal is generated by an analog control module, the driving signal is amplified by the driving module, the rotating speed of a circulating pump motor can be continuously regulated in real time, and phase currents are protected and limited cycle by cycle.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic view of a structural framework provided by an embodiment of a fluid circuit circulation pump driver according to the present invention;
FIG. 2 is a schematic diagram of a digital-to-analog conversion circuit provided by an embodiment of a fluid circuit circulation pump driver according to the present invention;
FIG. 3 is a schematic diagram of a filter conditioning protection circuit provided by an embodiment of a fluid circuit circulation pump driver according to the present invention;
FIG. 4 is a schematic diagram of a structural framework of a simulation control module provided by an embodiment of a fluid circuit circulation pump driver according to the present invention;
FIG. 5 is a schematic diagram of a Hall interface circuit provided by an embodiment of a fluid circuit circulation pump driver according to the present invention;
FIG. 6 is a schematic diagram of a current sampling circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an error correction adjustment circuit provided by an embodiment of a fluid circuit circulation pump driver according to the present invention;
FIG. 8 is a schematic diagram of a rotational speed soft start circuit provided by an embodiment of a fluid circuit circulation pump driver according to the present invention;
FIG. 9 is a schematic diagram of a driving module according to an embodiment of the present invention
FIG. 10 is a schematic circuit diagram of a rotational speed detection module according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a filtering module provided by another embodiment of a fluid circuit circulation pump driver according to the present invention;
FIG. 12 is a schematic diagram of a voltage conversion module according to another embodiment of a fluid circuit circulation pump driver of the present invention;
FIG. 13 is a schematic view of a surge suppression module according to another embodiment of a fluid circuit circulation pump driver of the present invention;
FIG. 14 is a schematic diagram of a first voltage detection module according to another embodiment of a fluid circuit circulation pump driver of the present invention;
FIG. 15 is a schematic diagram of a second voltage detection module according to another embodiment of a fluid circuit pump driver of the present invention;
FIG. 16 is a schematic diagram of a current detection module according to another embodiment of a fluid circuit circulation pump driver of the present invention;
FIG. 17 is a schematic view of a structural framework provided by an embodiment of a fluid circuit circulation pump driver according to the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present invention.
The embodiment provides a fluid circuit circulating pump driver can be applied to space environment, convert digital control signal by digital analog conversion module 1, generate drive signal by analog control module 2 again, amplify drive signal by drive module 3, can real-time continuous regulation circulating pump motor 0's rotational speed, protect the restriction to the looks electric current by cycle, compare with prior art, do not contain the microprocessor of high-cost space environment immunity, the inside pure analog circuit control mode that adopts of driver, the speed governing scope is wide and rotational speed stability is high, external digital control interface circuit is simple interference killing feature is strong, satisfy electromagnetic compatibility requirement, have multiple protect function reliability height, advantage such as small.
As shown in fig. 1, a schematic structural frame diagram of an embodiment of a fluid circuit circulation pump driver according to the present invention is provided, the driver being for driving a circulation pump motor 0, comprising: the digital-to-analog conversion module 1, the analog control module 2 and the driving module 3 are sequentially connected, the driving module 3 is connected with the circulating pump motor 0, wherein the digital-to-analog conversion module 1 is used for obtaining a digital control signal for controlling the rotating speed of the circulating pump motor 0 and converting the digital control signal into an analog control signal, the analog control module 2 is used for carrying out pulse width modulation on the analog control signal to generate a driving signal, and the driving module 3 is used for carrying out power amplification on the driving signal and sending the driving signal to the circulating pump motor 0.
It should be noted that, the digital-to-analog conversion module 1 may include a digital-to-analog conversion circuit, as shown in fig. 2, the digital-to-analog conversion circuit may include a digital-to-analog conversion chip U1, preferably, the model may be TLV5638, and a capacitor C1 of 0.1 μf/50V is connected between the VDD terminal and the AGND terminal of the digital-to-analog conversion chip U1.
It should be understood that, in order to improve the anti-interference performance of the driver, the rotation speed control interface for obtaining the digital control signal may use a digital SPI interface, and the digital-to-analog conversion circuit converts the digital SPI signal inputted from the outside into a voltage signal for adjusting the rotation speed of the circulation pump motor 0 in real time.
In order to perform impedance matching conditioning and amplitude limiting protection on input voltage, a filtering conditioning protection circuit can be further connected to the output end of the digital-to-analog conversion chip U1, as shown in fig. 3, the circuit can comprise a filter, a voltage follower and an amplitude limiting protection circuit, the OUTB end of the digital-to-analog conversion chip U1 is connected with the positive input end of the voltage follower U2, the output of the voltage follower U2 is connected with an RC filter, and the voltage follower U2 and a resistance-capacitance network connected later simultaneously play a role in amplitude limiting protection. The specific connection relation of the conditioning circuit is shown in a graph, wherein the resistance values of the resistors R1, R2, R3, R4 and R5 can be 10kΩ, the capacities of the capacitors C2, C3, C4 and C5 can be 0.1 mu F/50V, the capacities of the capacitors C6 and C7 can be 10 mu F/25V, and the model of the voltage follower U2 can be LM158JG.
The input digital control signals can be input through DIN end, SCLK end, CS end and the like of the digital-to-analog conversion chip U1, and after the digital control signals are converted through the digital-to-analog conversion chip U1, the obtained analog control signals are output through the Uref end of the conditioning circuit.
Uref＝2*REF*Data/4096；
Wherein, REF is the internal reference voltage value of the digital-to-analog conversion chip U1, REF register value is 1.024V or 2.048V through SPI interface, data is the register value representing expected rotation speed set by SPI interface, the digital value range is 0-4096, therefore, the range of Uref is 0V-4.096V. In order to prevent the single event upset effect of the space environment in the space station, the driver controls the SPI interface to refresh the contents REF and Data of the control register at regular time, and the refresh time interval is between 500ms and 1s according to the response characteristic of the motor.
The relation between the real-time rotating speed N of the rotating speed of the circulating pump motor 0 and the converted and conditioned voltage Uref is as follows:
N(rpm)＝Uref(V)*4000；
the relation between the real-time rotating speed N of the rotating speed of the circulating pump motor 0 and the real-time set value Data of the SPI interface is as follows:
N(rpm)＝8000*REF*Data/4096；
as can be seen from the formula, the rotation speed adjustment range is 0rpm to 16000rpm, and the minimum resolution of rotation speed adjustment is the rotation speed when the setting Data is increased by 1, i.e., 8000×1.024×1/4096 (rpm) =2 (rpm).
As shown in fig. 4, the analog control module 2 includes: the motor control chip U3 is respectively connected with the Hall interface circuit 21, the rotating speed soft start circuit 24, the error correction regulating circuit 23 and the current sampling circuit 22, the Hall interface circuit 21 is connected with the circulating pump motor 0, the current sampling circuit 22 is connected with the driving module 3, and the motor control chip U3 is also respectively connected with the digital-to-analog conversion module 1 and the driving module 3.
The motor control chip U3 is responsible for the functions of motor logic commutation, duty ratio modulation of a rotating speed closed loop, fault diagnosis and the like. The brushless direct current motor control chip UC1625-SP of TI can be selected as the motor control chip U3, and the chip is integrated with interfaces such as logic commutation, error amplifier, speedometer, overvoltage protection, overcurrent protection and the like, and has the advantages of small volume, simple configuration of peripheral circuits and the like.
It should be understood that, the motor control chip U3 is configured to adjust the rotation speed of the circulating pump motor 0 by chopping the PWM signal, so that the setting of the chopping frequency is critical, when the switching frequency f is set to be low, for example, lower than 8kHz, the switching loss of the power device can be reduced, but the speed regulation of the circulating pump motor 0 during high-speed rotation is not facilitated, noise in the audio frequency range is easy to be generated, and when the switching frequency is set to be too high, for example, higher than 50kHz, the switching loss can be greatly increased. The chopping frequency f is set by an external resistor and capacitor, and the formula is:
f＝2/(R osc *C osc )；
wherein R is osc The resistance value of the chopping frequency is set to be between 10kΩ and 100kΩ, C osc Is a capacitance value for setting the chopping frequency, and the capacitance value is between 1nF and 100 nF. The voltage of the post-chopper frequency signal is set to be a sawtooth wave, the peak value is 1.2V, and the DC offset is 1.6V. The comprehensive circuit parameters are set to 19.34kHz in consideration of the switching frequency, the resistance value is 22kΩ, the capacitance is 4.7nF, and in order to reduce the change of the oscillation frequency in the full temperature range, the capacitance is a ceramic capacitance with stable temperature characteristic and smaller capacitance deviation.
It should be understood that the hall interface circuit 21 is connected to the hall sensor H1 of the circulation pump motor 0, and obtains the hall signal output from the circulation pump motor 0 through the hall sensor H1.
The Hall interface circuit 21 is used for acquiring a Hall signal output by the circulating pump motor 0, and the motor control chip U3 is used for acquiring the real-time rotating speed of the circulating pump motor 0 according to the Hall signal and performing speed closed-loop control on the circulating pump motor 0 according to the real-time rotating speed; the current sampling circuit 22 is configured to obtain a sampling current output by the driving module 3, and the motor control chip U3 is further configured to perform pulse width modulation on the analog control signal according to the sampling current, generate a driving signal, and send the driving signal to the driving module 3.
As is known from the control principle of a three-phase brushless dc motor, it is necessary to commutate it continuously in order to ensure a constant maximum torque. By selecting an appropriate commutation time, torque ripple can be reduced. Position detection is used not only for commutation control but also for generating a speed control quantity, and thus position detection is very important.
The position signal sampling is detected by a Hall sensor H1 of the circulating pump motor 0, the Hall sensor H1 is an electrode open circuit output, the output signal of the Hall sensor H1 is pulled up to obtain a position square wave signal through a pull-up resistor, and the position square wave signal is respectively sent to a speed stabilizing circuit through a filter circuit to measure the speed of the motor, and a pulse distribution circuit to perform phase change of the position signal.
It should be noted that, because the output stage of the hall sensor H1 is an OC circuit, a pull-up resistor is disposed at the interface between the motor control chip U3 and the hall sensor H1, so that, on one hand, the current input to the hall sensor H1 is limited not to exceed the self specified value of the hall sensor H1, and on the other hand, it must be ensured that the reduction of technical parameters such as the current of the hall sensor H1 meets the specification requirements, the resistance value of the pull-up resistor cannot be too large, the driving current becomes small when the value is too large, the anti-interference capability of the signal becomes poor, which is unfavorable for the normal switching of the hall interface circuit 21, and the resistance value of the pull-up resistor is selected to be 5kΩ to 10kΩ according to the characteristics of the hall sensor. As shown in fig. 5, a schematic diagram of a possible hall interface circuit 21 is shown, in which 3 resistors R6, R7, R8 are respectively connected in series to the OUT1 end, the OUT2 end, and the OUT3 end of the hall sensor H1, and are respectively connected to the HIN1 end, the HIN2 end, and the HIN3 end of the motor control chip U3, where the resistance value of each series resistor may be 1kΩ, and the pull-up resistor is not shown in the drawing.
Meanwhile, considering that a connecting line between a Hall sensor H1 and a driver printed board in the circulating pump motor 0 is longer, a Hall signal has motor operation noise interference, a noise absorption circuit can be connected in series on a connecting loop of a motor control chip U3 and the Hall sensor H1, the absorption circuit comprises 3 resistors R6, R7 and R8 and 3 capacitors C8, C9 and C10, the connecting relation is shown in fig. 5, and the capacitance value of each capacitor can be 2.2nF.
The cut-off frequency fcx=1/(2 pi Rcx Ccx) of the absorption circuit, where Rcx is a series resistor, the resistance is 1kΩ, ccx is a parallel capacitor, and the capacitance is 2.2nF, so the cut-off frequency fcx is about 72kHz.
The current sampling circuit 22 connected to the motor control chip U3 may realize a sampling function by using a sampling resistor, etc., where the current sampling circuit may make the driver perform current comparison and limitation in each control period, so as to effectively stabilize three-phase current fluctuation and prevent the driver from being burnt due to excessive current.
As shown in fig. 6, a possible current sampling circuit 22 is provided, the connection relation of which is shown in the figure, and the sampling current outputted from the driving module 3 flows into the motor control chip U3 through the current amplifier A1. The current amplifier A1 IS a differential input current amplifier, the output end IS respectively connected with an IS1 end and an IS2 end of the motor control chip U3, the resistance value of the resistors R9 and R10 can be 270 omega, the capacitance value of the capacitor C11 can be 4.7nF, the common end of the three-phase bridge IS sampled by utilizing the sampling resistor Rs, the resistance value of the Rs IS between 10mΩ and 20mΩ, after RC filtering, the voltage on the sampling resistor Rs can be connected to the current sampling input end of the motor control chip U3, so that the motor control chip U3 can carry out pulse width adjustment according to the magnitude of feedback current in each PWM control period, namely, cycle-by-cycle current control IS realized.
Vsense＝2.5V+2*ABS(IS1-IS2)；
Wherein ABS (IS 1-IS 2) IS the absolute value of the voltage difference between IS1 terminal and IS2 terminal, and Vsense IS the filtered output voltage.
From the formula, the gain of the current amplifier A1 is equal to 2, and the voltage Vsense filtered by the output end of the current amplifier A1 is connected with the comparator in the motor control chip U3, and the comparison voltages are 2.9V and 3.1V respectively. When the winding current of the circulation pump motor 0 exceeds: (2.9V-2.5V)/2=0.2V/Rs, the output drive forced chopper performs current limiting; when the motor winding current exceeds (3.1V-2.5V)/2=0.3V/Rs, the comparator turns over, the output drive latches until the overcurrent condition disappears, and the driver resumes normal logic. According to the actual condition of motor winding current, sampling resistor Rs is 20mΩ, phase current exceeds 10A, and the driver performs chopper current limiting; when the phase current exceeds 15A, the output is locked, and the motor stops running.
It should be noted that the analog control module 2 further includes: the error correction adjustment circuit 23, the error correction adjustment circuit 23 is connected to the motor control chip U3, and as shown in fig. 7, the error correction adjustment circuit 23 is used to set the rotational speed limit range, rotational speed stability, and response time of the circulation pump motor 0.
The error correction adjustment circuit 23 may include an adjustable resistor R bal The resistors R15, R16, the capacitors C16, C17 and the amplifier A2 are connected as shown in the figure. The Uc end is connected with a motor control chip U3, the motor control chip U3 converts a three-phase Hall signal of the circulating pump motor 0 into a frequency signal which is 6 times of the Hall signal through a monostable trigger, and then the frequency signal is supplied to the Un as a closed loop speed for adjusting after peripheral resistance-capacitance low-pass filtering, and the resistance values of resistors R15 and R16 and the capacitance values of capacitors C16 and C17 can be set according to actual dynamic response requirements.
Wherein U is c U, which is the output of the error correction regulating circuit 23 ref After the digital control signal is converted for the digital-to-analog conversion chip U1, the obtained analog control signal is output through the voltage of the conditioning circuit, U n Is a feedback voltage value proportional to the real-time rotational speed of the motor operation.
It should be understood that the time constant τ of the monostable trigger is set according to the highest rotation speed of the motor 0 of the circulating pump, the monostable trigger is triggered at the rising edge of three hall signals, the high level 5V of τ time is maintained and then jumps to the low level 0V until the next hall rising edge signal is triggered again, a periodic square wave voltage signal is output, the period T of the square wave signal is consistent with the jump period of the three hall signals, the duty ratio represents the rotation speed of the motor after normalization, a voltage signal Un proportional to the duty ratio is generated through a low pass filter, and then an error adjusting signal is generated through error amplification to control the rotation speed of the motor. The output signal of the error amplifier controls PWM modulation to generate a duty ratio, and the voltage of the driving power supply is regulated according to the duty ratio to control the rotating speed of the motor. This variable dc voltage is a smooth control for the motor response, and the motor acceleration, deceleration, and speed remain proportional to this voltage.
In order to ensure stable commutation of the motor and certain fault tolerance, the calculated value of the tau time constant is designed to be less than half of the commutation interval at the highest rotating speed:
τ＝0.67R T *C T ＝0.5*Period；
wherein R is T Setting resistance of 10-500 k omega for setting commutation interval, C T In order to set the capacitor of the commutation interval, the capacitance value is between 1nF and 100nF. The fastest motor interval Period is:
Period＝20/(RPM max *N poles )；
assume the motor maximum RPM max =12000 rpm, motor pole pair number N poles =2, the maximum commutation interval is 834us, and the time constant that can be used is half the interval time, thus setting C T =4.7 nF, then the two above-mentioned formulas are combined, R T =132.4kΩ, time constant τ=417 uS.
It should be appreciated that the voltage value Un proportional to the feedback rotational speed can be calculated as:
un=5v (square wave voltage high voltage output by monostable flip-flop) ×τ/Period.
It should be noted that the analog control module 2 further includes: the rotation speed soft start circuit 24, the rotation speed soft start circuit 24 is connected with the SSTART end and the VREF end of the motor control chip U3, as shown in fig. 8, and the rotation speed soft start circuit is used for realizing the rotation speed soft start of the driver.
Wherein, the resistance of the resistor R11 can be 51kΩ, the capacitance of the capacitor C12 can be 0.1 μF/50V, the capacitance of the capacitor C13 can be 10 μF, and the capacitance of the capacitor C14 can be 22 μF.
When under-voltage and over-current protection occurs, the trigger is discharged by a capacitor externally connected with a set motor control chip U3, and the signal clamps the output of the speed error amplifier. When the driver is started normally or under-voltage and over-current disappear, the capacitor externally connected with the motor control chip U3 is charged slowly, the clamping voltage of the speed error amplifier is increased slowly, and the rotating speed soft start function is realized.
It should be noted that, the driving module 3 may include a driving circuit, and the driving circuit is mainly responsible for driving and amplifying the PWM signal output by the analog control module 2, and supplying power to the motor in three phases sequentially, so as to generate an alternating magnetic field, so that the motor rotates and drives the fluid load.
As shown in fig. 9, a possible driving module 3 structure is provided, where the driving module 3 mainly includes a driving chip U4 and a protection circuit, the driving chip U4 may be an integrated three-phase bridge driving chip of MSK company, and the model is MSK4301HU, and the current conversion system is in a three-phase six-state with two phases being conducted. The protection circuit consists of an external diode and a resistor-capacitor circuit.
Optionally, a hybrid thick film integration is adopted inside a driving chip U4 in the driving module 3, the hybrid thick film integration comprises 6 power devices, all the power devices adopt full N-channel MOSFET, on resistance is 22mΩ, on loss is greatly reduced, the continuous output capacity of 75V/29A is realized, peak current can reach 41A, the internal high-end grid drive adopts a charge pump refreshing mode to pump up voltage, the problems of self-locking and incapability of starting full duty ratio during normal bootstrap power supply are avoided, and therefore, the duty ratio can be randomly adjusted between 0% and 100%. The driving chip U4 adopts an all-metal sealed shell, beryllium oxide is adopted as an insulating material in the power device, and the power device has high insulating voltage and good heat conduction performance.
The driving module 3 can enable the whole driving circuit to be simple and reliable, has the functions of under-voltage locking protection, overcurrent protection, integrated dead time protection, breakdown protection, input shutoff and the like, and improves the practicability and reliability of the system.
In the driving chip U4, a VBIAS end is connected with the power module 12, 12V voltage is input, an AH end, an AL end, a BH end, a BL end, a CH end and a CL end are connected with a motor control chip U3 of the analog control module 2, PWM signals are input, a V+ end and a V-end are connected with the power module 12, 28V voltage is input,end (s)/end(s)>End (s)/end(s)>The end is connected with the motor 0 of the circulating pump and outputs a driving signal with amplified powerThe Rs end can be connected with the analog control module 2 to output sampling current, the EN end inputs an enabling signal, and the SWR end is connected with a resistor in series to set dead zone protection time, for example, the dead zone time of the resistor connected with 12k omega in series is 1us, so that the upper tube and the lower tube of the three-phase bridge can be effectively prevented from being simultaneously conducted to burn the module.
Optionally, in some embodiments, the driving module 3 is configured to amplify the PWM driving signal output by the analog control module 2, send the PWM driving signal to the circulation pump motor 0, and sequentially supply power to the circulation pump motor 0 in three phases, generate an alternating magnetic field, and make the motor rotate and drive the fluid load; the driving module 3 adopts a charge pump mode to control a high-end power tube, and the duty ratio is any value between 0% and 100%; the driving module 3 is used for designing and adjusting dead time; the driving module 3 is used for under-voltage locking protection and over-current protection of the power supply voltage.
Optionally, in some embodiments, as shown in fig. 10, it may further include: the rotating speed detection module 4, the rotating speed detection module 4 is connected with the motor control chip U3, the rotating speed detection module 4 is used for obtaining Hall signals, and the rotating speed of the circulating pump motor 0 is obtained according to the Hall signals.
The rotation speed detection module 4 may include a rotation speed detection chip U5, optionally, the model may be CD4049, a VCC end of the rotation speed detection chip U5 is connected IN series to a capacitor C15, a capacitance value may be 0.1 μf/50v, an IN1 end, an IN2 end, and an IN3 end are grounded, an OUT6 end, an OUT5 end, and an OUT4 end are respectively connected IN series to resistors R12, R13, and R14, an OUT6 end, an OUT5 end, and an OUT4 end are respectively used for outputting a detection result, and the IN6 end, the IN5 end, and the IN4 end are respectively connected with a motor control chip U3 IN the circulation pump motor 0.
The rotation speed telemetry signal is output by using a Hall frequency signal of the motor through a NOT gate to reflect the real-time rotation speed of the motor. The working running state of the driver can be effectively monitored by judging the magnitude and the stability of the rotating speed signal. The relation between the actual rotation speed N of the circulating pump motor 0 and the rotation speed telemetry signal frequency fyc is as follows:
rotational speed N (rpm) =frequency fyc (Hz) 30.
Optionally, in some embodiments, as shown in fig. 11, it may further include: the filtering module 6, the filtering module 6 is connected with the power module 12 and the driving module 3 respectively, the filtering module 6 is used for filtering the power module 12 and inhibiting noise generated by the operation of the circulating pump motor 0, the filtering module 6 comprises two modes of common mode filtering and differential mode filtering, and the differential mode capacitors are all arranged in a mode of connecting 2 capacitors in series into a capacitor bank.
According to the space application environment of the driver, the driver needs to meet EMC related test projects, so that electromagnetic compatibility design is needed to be carried out on the driver, according to the current characteristics of the brushless direct current motor driver, the filter design is mainly carried out on a power bus, namely, the EMI circuit design is carried out in a mode of common mode filter and differential mode filter, and the circuit adopts one-stage pi-shaped filter.
As shown in fig. 11, the capacitor group formed by the capacitors C18 and C19 and the capacitor group formed by the capacitors C20 and C21 are differential mode capacitors, and in order to improve the reliability and prevent the short circuit failure of a single capacitor, two capacitors are connected in series to form the capacitor group for suppressing differential mode signals. The capacitance values of the capacitors C18, C19, C20 and C21 can be 220uF/75V.
In order to ensure that the driver has attenuation and inhibition effects on common-mode signals in the power line and ensure that the radiation emission index of the driver meets the requirements, the common-mode filter circuit consists of a common-mode inductor L1 and common-mode filter capacitors C22 and C23. The common mode filter inductor L1 can be of a model of HYL3255, the working current is 10A, and the inductance is 1mH. The common mode filter capacitors C22 and C23 are high-voltage ceramic capacitors, the model can be CL20-400V-0.022uF, the midpoint of the common mode filter capacitors C22 and C23 are reliably connected with the driver shell, and the connecting paths are as short as possible, so that a low-impedance path is ensured.
The OUT1 end of the filter module 6 can be connected with the power module 12, can also be connected with the surge suppression module 8, the OUT end can be connected with the driving module 3, and the PE end is connected with the shell of the driver.
Optionally, since the quality of the bus voltage has a larger influence on the stability and control accuracy of the system, a filter capacitor can be further added on the bus direct-current voltage side. The filter capacitor has the functions of filtering and energy storage, namely, the ripple of the bus voltage is filtered, and the constant direct current voltage is kept as much as possible; meanwhile, necessary reactive power is provided for the motor with inductive load, and the mutual interference with a front-stage rectifying circuit is eliminated; the energy storage capacitor also has an important function of absorbing reverse electromotive force generated by the instantaneous stopping or reversing of the motor so as to protect the driver. According to the working current of the motor, an organic film capacitor of EuroFarad PM907S series 150uF/100V can be selected, the organic film capacitor has certain self-recovery property, the quality grade of the capacitor is ESCC authentication Level B, and a small ceramic dielectric capacitor can be connected in parallel behind a large capacitor to inhibit the interference of a high-frequency part.
Optionally, in order to meet the environmental suitability and improve the anti-interference capability, the shielding ground of the filter module 6 and the shielding ground of the circulating pump motor are overlapped with the metal shell of the driver, and the overlap resistance is smaller than 10mΩ. In order to prevent the electromagnetic interference of the strong current of the driving part to the low-voltage logic control part, the driving ground and the controlled secondary ground are short-circuited by a single-point grounding mode.
Optionally, in some embodiments, as shown in fig. 12, it may further include: the voltage conversion module 7 is respectively connected with the power supply module 12, the analog control module 2, the driving module 3 and the circulating pump motor 0, and the voltage conversion module 7 is used for converting the initial voltage of the power supply module 12 into working voltages of the analog control module 2, the driving module 3 and the circulating pump motor 0.
The 28V direct current voltage is converted into 12V according to the power consumption specification and power requirement of each device of the control circuit, and the required current is about 120mA. The three-terminal voltage stabilizer LM117QML-SP of TI can be selected for voltage conversion, and the LM117QML-SP can output 500mA current at maximum, has a short-circuit protection function and resists the single event effect of the space environment. The three-terminal voltage regulator is adopted for voltage conversion, so that voltage ripple can be effectively reduced, and power supply noise can be restrained.
As shown in fig. 12, the voltage conversion chip U6, resistors R17, R18 and R19, capacitors C24, C25, C26, C27 and C28 are included, the connection relation is shown in the figure, the capacitance values of the capacitors C24 and C25 can be 0.047 μf/100V, the capacitance values of the capacitors C26, C27 and C28 can be 0.1 μf/50V, the resistance values of the resistors R17 and R18 can be 2.5kΩ, the resistance value of the resistor R19 can be 10kΩ, the voltage input of the OUT1 end is 28V, the voltage output of the OUT2 end is 12V, and the voltage output is respectively connected with the power supply module 12, the analog control module 2, the driving module 3 and the circulating pump motor 0.
Optionally, in some embodiments, as shown in fig. 13, it may further include: the surge suppression module 8 is respectively connected with the power module 12, the filtering module 6 and the voltage conversion module 7, and the surge suppression module 8 is used for suppressing surge current when the circulating pump motor 0 is powered on and started so as to protect the power module 12.
In order to suppress the current of the driver at the moment of power-up and protect the system power supply, the driver is provided with an inrush current suppressing circuit at the input port of the power module 12, and the circuit diagram is shown in fig. 13.
A MOSFET Q1 is connected in series to the input bus, and a P-CHANNEL MOSFET with a withstand voltage of 100V is adopted for 28V voltage, and the model is IRF5M5210SCV. At the moment of starting up, due to the action of the resistors R20 and R21, the grid capacitance of the MOSFET Q1 is slowly charged, so that the working state of the MOSFET Q1 is gradually and slowly transited from an amplifying region to a saturation region, and due to the fact that the MOSFET Q1 is equivalent to a variable resistor in the amplifying region, the current flowing through the device is limited by the larger internal resistance of the MOSFET Q1 at the moment of starting up, the purpose of limiting the power supply current in the driver is achieved, once the MOSFET Q1 is saturated, the on resistance of the device is small, the current flowing through the device is unlimited, and the current which normally works by the driver can smoothly flow through the device and return to the power supply.
The resistances of the resistors R20 and R21 can be 390kΩ, the resistances of the resistors R22 and R23 can be 820kΩ, the resistances of the resistor R24 can be set according to practical requirements, the capacitances of the capacitors C29 and C30 can be 0.1 μf/100v, the terminal in1 is connected with the power module 12, and the terminal OUT1 is connected with the filtering module 6 and the voltage conversion module 7 respectively. After passing through the surge suppression module 8, the power-on starting surge current is suppressed to 5A-7A, and the duration is 2 ms-5 ms.
Optionally, the circulating pump belongs to unidirectional rotation subassembly, and the condition that the motor was reversed can not appear under the normal condition, does not have the operating mode of sudden braking yet, therefore the impact of motor back electromotive force to the power is less relatively. If the motor suddenly stops suddenly and unexpectedly, current still exists in the armature, and a current leakage loop is needed to be provided for the current when the motor is in power failure. In the design, each MOSFET in the driving module 3 is provided with a free-wheeling diode, so that the reliability of the three-phase bridge driving circuit is improved. In order to prevent the back pressure impact on the power supply end during discharging, a diode can be connected in series on a 28V power bus, and a three-phase bridge driving voltage energy storage capacitor can also provide a current discharging loop.
Optionally, in some embodiments, it may further include: the first voltage detection module 9 and the second voltage detection module 10, the first voltage detection module 9 is connected on the output line of the filtering module 6 for detecting the voltage between the filtering module 6 and the driving module 3, and the second voltage detection module 10 is connected on the output line of the voltage conversion module 7 for detecting the voltage between the voltage conversion module 7 and the power module 12, the analog control module 2, the driving module 3 and the circulation pump motor 0.
As shown in fig. 14, a schematic structure diagram of the first voltage detection module 9 is shown, in order to prevent the short-circuit failure of the resistor and improve the reliability of the driver, the voltage dividing resistor adopts a series-parallel connection mode, and the output series diodes are used for protection, and the connection relationship is shown in the figure. The resistances of the resistors R25 and R26 may be 10kΩ, the resistances of the resistors R27 and R28 may be 6.2kΩ, the model of the diode D1 may be 2ck78f, and the terminal in2 and the terminal YC are connected to the output line of the filtering module 6.
The YC voltage is thus 3V-4V when the drive is operating normally, beyond which the drive is considered to be faulty.
As shown in fig. 15, the second voltage detection module 10 is schematically configured, in order to prevent the short-circuit failure of the resistor and improve the reliability of the driver, the voltage dividing resistor adopts a series-parallel connection mode, and the output series diodes are used for protection, and the connection relationship is shown in the figure. The resistances of the resistors R29, R30, R31, and R32 may be all 10kΩ, the model of the diode D2 may be 2ck78f, and the terminal in2 and the terminal YC are connected to the output line of the filtering module 6.
The YC voltage is thus 2V-3V when the drive is operating normally, beyond which the drive is considered to be faulty.
The power supply state of the driver can be reflected through the first voltage detection module 9 and the second voltage detection module 10, and once the power supply fails, the problem of the power supply source can be quickly and effectively positioned.
Optionally, in some embodiments, as shown in fig. 16, it may further include: the current detection module 11, the current detection module 11 is connected to the output line of the power module 12, and is used for detecting the current between the surge suppression module 8 and the power module 12. By judging the magnitude and fluctuation of the current value, the working operation state of the driver can be effectively monitored.
The hall sensor H2 can be used to remotely measure the current of the motor driving voltage 28V, and in order to improve the reliability and safety of the driver, the remote measurement output is further provided with a diode and a protection circuit of resistance and capacitance.
As shown in fig. 16, the current detection module 11 may include two parts, namely a hall sensor H2 and a protection circuit, where a CEIN terminal and a CEOUT terminal of the hall sensor H2 are connected in series to an output line of the power module 12, a Vout terminal is connected to the protection circuit, the protection circuit may be HCD-10BJKB for H2 type, a resistor R33 has a resistance value of 62kΩ, a capacitor C31 has a capacitance value of 10 μf/25V, a capacitor C32 has a capacitance value of 0.1 μf/50V, and diodes D3 and D4 may both have a type of 2CK78F, and a detection result may be output through an OUT1 terminal of the protection circuit.
I28V＝(Vout-2.5)*4；
Wherein I28V is the actual working current value of the power supply voltage of the circulating pump, and Vout is the voltage output of the current monitoring module. When the driver works normally, the voltage range of Vout is 4V-4.5V, the corresponding current I28V is 6A-8A, and beyond the range, the driver is considered to have faults.
It is to be understood that in some embodiments, some or all of the structures, modules, etc. described in the above embodiments may be included.
In another embodiment of the present invention, as shown in fig. 17, a schematic structural frame diagram of a driver including all the modules in the above embodiment is given.
The driver is used for driving the circulating pump motor 0, and comprises: the device comprises a digital-to-analog conversion module 1, an analog control module 2, a driving module 3, a rotating speed detection module 4, a filtering module 6, a voltage conversion module 7, a surge suppression module 8, a first voltage detection module 9, a second voltage detection module 10 and a current detection module 11, wherein the whole driver is powered by a power supply module 12.
The 28V power output by the power supply module 12 sequentially passes through the surge suppression module 8, the filtering module 6 and the driving module 3, the 28V power passing through the surge suppression module 8 is also output to the voltage conversion module 7, converted into 12V power and then respectively transmitted to the analog control module 2, the driving module 3 and the circulating pump motor 0.
The digital-to-analog conversion module 1 acquires a digital control signal and then sends the digital control signal to the analog control module 2, generates a driving signal and then sends the driving signal to the driving module 3, and the driving signal is amplified and then sent to the circulating pump motor.
The driving circuit 3 sends sampling current to the analog control module 2, the circulating pump motor 0 sends hall signals to the analog control module 2, and the error correction adjusting circuit 5 performs error correction adjustment according to the hall signals.
The rotation speed detection module 4 is connected with the analog control module 2, detects the speed of the circulating pump motor 0 according to the Hall signal, the first voltage detection module 9 and the second voltage detection module 10 are used for detecting the voltage of the driver, and the current detection module 11 is used for detecting the current of the driver.
The reader will appreciate that in the description of this specification, a description of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present invention.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (9)

1. A fluid circuit circulation pump driver for driving a circulation pump motor (0), comprising: the digital-to-analog conversion module (1), the analog control module (2) and the driving module (3) are sequentially connected; the driving module (3) is connected with the circulating pump motor (0); the analog control module (2) includes: the motor control device comprises a motor control chip, a Hall interface circuit (21), a current sampling circuit (22), an error correction regulating circuit (23) and a rotating speed soft start circuit (24), wherein the motor control chip is respectively connected with the Hall interface circuit (21), the rotating speed soft start circuit (24), the error correction regulating circuit (23) and the current sampling circuit (22), the Hall interface circuit (21) is connected with a circulating pump motor (0), the current sampling circuit (22) is connected with a driving module (3), and the motor control chip is also respectively connected with a digital-to-analog conversion module (1) and the driving module (3);
The digital-to-analog conversion module (1) is used for obtaining a digital control SPI interface signal for externally controlling the rotating speed of the circulating pump motor (0), converting the digital control SPI interface signal into an analog control signal, adding an impedance matching and amplitude limiting protection circuit after a conversion circuit, and the conversion formula of the digital-to-analog conversion module (1) is as follows:
Uref＝2*REF*Data/4096；
the voltage output of the digital-to-analog conversion module (1) is Uref, the REF is an internal reference voltage value of the digital-to-analog conversion chip, the Data is a register value set by the SPI interface and representing expected control rotating speed, the driver controls the SPI interface to refresh the contents REF and Data of the control registers at regular time, and the refresh time interval is between 500ms and 1s according to the response characteristic of the motor;
the simulation control module (2) is used for obtaining the real-time rotating speed of the circulating pump motor (0) according to the Hall signal of the circulating pump motor (0), performing speed closed-loop control on the circulating pump motor (0) according to the current sampling circuit (22) and the externally set target rotating speed and the current real-time rotating speed, generating a driving signal and sending the driving signal to the driving module (3);
the motor control chip is used for generating PWM chopping frequency, the chopping frequency f is set by external resistance and capacitance, and the formula is:
f＝2/(R osc *C osc )；
Wherein R is osc The resistance value of the chopping frequency is set to be between 10kΩ and 100kΩ, C osc Setting a capacitance value of chopping frequency, wherein the capacitance value is between 1nF and 100 nF; setting the voltage of the post-chopping frequency signal as sawtooth wave, the peak value as 1.2V and the DC offset as 1.6V;
the Hall interface circuit (21) is used for acquiring a Hall signal output by the circulating pump motor (0), and a noise absorption circuit is connected in series on a Hall signal acquisition path, so that the motor operation interference noise is filtered, and the phase change operation of the driver is stable;
the current sampling circuit (22) is used for obtaining sampling current output by each control period of the driving module (3), the resistance value of the sampling resistor Rs is between 10mΩ and 20mΩ, and RC low-pass filtering is carried out; pulse width adjustment is carried out in each PWM control period according to the magnitude of the feedback current, so that cycle-by-cycle current control is realized, three-phase current fluctuation is stabilized, and the driver is prevented from being burnt due to overlarge current;
the error correction and adjustment circuit (23) is used for setting the rotation speed limit range, the rotation speed stability and the response time of the circulating pump motor (0); the rotating speed soft start circuit (24) is used for realizing the rotating speed soft start of the driver, so that the rotating speed slowly rises after the driver is normally started or under-voltage overcurrent protection is restarted, and the current and voltage impact caused by the given speed mutation is reduced;
The closed-loop control expression of the analog control module (2) is as follows:
U n ＝5*τ/Period；
τ＝0.67R T *C T ＝0.5*Period；
Period＝20/(RPM max *N poles )；
wherein U is c U, which is the output of the error correction regulating circuit (23) ref For voltage output of the digital-to-analog conversion module (1), U n For the feedback voltage value proportional to the real-time rotation speed of the motor, τ is the time constant of the monostable trigger for collecting the Hall signal, R T Setting resistance of 10-500 k omega for setting commutation interval, C T To set the commutation interval for a set capacitance, the capacitance value is between 1nF and 100nF, period is the motor interval time, RPM max For the highest rotation speed of the motor, N poles Is the pole pair number of the motor.
2. The fluid circuit circulation pump driver according to claim 1, wherein the driving module (3) is configured to amplify power of the PWM driving signal output by the analog control module (2), send the PWM driving signal to the circulation pump motor (0), and supply power to the circulation pump motor (0) in three-phase sequence to generate an alternating magnetic field, so that the motor rotates and drives the fluid load; the driving module (3) adopts a charge pump mode to control a high-end power tube, and the duty ratio is any value between 0% and 100%; the driving module (3) is used for designing and adjusting dead time; the driving module (3) is used for under-voltage locking protection and over-current protection of the power supply voltage.
3. The fluid circuit circulation pump driver of claim 1, further comprising: the rotating speed detection module (4), rotating speed detection module (4) with motor control chip is connected, rotating speed detection module (4) are used for acquireing hall signal, according to hall signal obtains circulating pump motor (0) actual operation rotational speed, circulating pump motor (0) actual rotational speed N and the relation of rotational speed telemetering signal frequency fyc are:
rotational speed N (rpm) =frequency fyc (Hz) 30.
4. The fluid circuit circulation pump driver of claim 1, further comprising: the filtering module (6) is respectively connected with the power supply module (12) and the driving module (3), the filtering module (6) is used for filtering the power supply module (12) and inhibiting noise generated by the operation of the circulating pump motor (0), the filtering module (6) comprises a common mode filtering mode and a differential mode filtering mode, and differential mode capacitors are all arranged in a mode of connecting 2 capacitors in series into a capacitor group;
the filter module (6) further comprises an organic film capacitor with self-recovery property as an energy storage capacitor, and is used for eliminating supply voltage pulsation, providing necessary reactive power for inductive motor load and absorbing reverse electromotive force generated by instantaneous motor stall or reverse rotation so as to protect the driver;
The shielding ground of the filtering module (6) and the shielding ground of the circulating pump motor (0) are overlapped with the metal shell of the driver, and the overlap resistance is smaller than 10mΩ; the driver internally drives and controls the secondary ground to carry out short circuit treatment in a single-point grounding mode.
5. The fluid circuit circulation pump driver of claim 1, further comprising: the voltage conversion module (7) is respectively connected with the power supply module (12), the analog control module (2), the driving module (3) and the circulating pump motor (0), and the voltage conversion module (7) is used for converting the initial voltage of the power supply module (12) into working voltages of the analog control module (2), the driving module (3) and the circulating pump motor (0); the voltage conversion module (7) adopts a three-terminal voltage stabilizer and a peripheral resistor-capacitor circuit to perform voltage conversion so as to reduce voltage ripple and inhibit power supply noise.
6. The fluid circuit circulation pump driver of claim 1, further comprising: the surge suppression module (8) is respectively connected with the power supply module (12), the filtering module (6) and the voltage conversion module (7), and the surge suppression module (8) is used for suppressing surge current when the circulating pump motor (0) is started and protecting the power supply module (12); after passing through the surge suppression module (8), the power-on starting surge current value is suppressed to be 5A-7A, and the duration of the surge current is 2 ms-5 ms.
7. The fluid circuit circulation pump driver of claim 1, further comprising: the device comprises a first voltage detection module (9) and a second voltage detection module (10), wherein the first voltage detection module (9) is connected to an output line of the filtering module (6) and is used for detecting the voltage between the filtering module (6) and the driving module (3), and the second voltage detection module (10) is connected to an output line of the voltage conversion module (7) and is used for detecting the voltage between the voltage conversion module (7) and the power supply module (12), the analog control module (2), the driving module (3) and the circulating pump motor (0); the first voltage detection module (9) and the second voltage detection module (10) are arranged in a serial-parallel connection mode, and diodes are added at the output end to perform interface protection; the first voltage detection module (9) and the second voltage detection module (10) are used for reflecting the power supply state of the driver in real time, the first voltage detection module (9) outputs a first voltage range between 3V and 4V, the second voltage detection module (10) outputs a second voltage range between 2V and 3V, and the driver fails when the first voltage range or the second voltage range is exceeded.
8. The fluid circuit circulation pump driver of claim 1, further comprising: the current detection module (11) is connected to the output line of the power supply module (12) and is used for detecting the current between the surge suppression module (8) and the power supply module (12); the working operation state of the driver is monitored and faults are removed by judging the magnitude and fluctuation condition of the current, and the detected current has the formula:
I28V＝(Vout-2.5)*4；
wherein I28V is the actual working current value of the power supply voltage of the circulating pump, and Vout is the voltage output of the current monitoring module; when the driver works normally, the voltage range of Vout is 4V-4.5V, the corresponding current range I28V is 6A-8A, and if the voltage range or the current range is exceeded, the driver has faults.
9. The fluid circuit circulation pump driver according to any one of claims 1 to 8, characterized in that the control formula for controlling the real-time rotational speed N of the circulation pump motor (0) is:
N(rpm)＝8000*REF*Data/4096；
the method comprises the steps that rpm is an abbreviation of rotation speed unit rotation per minute, REF is an internal reference voltage value of a digital-to-analog conversion chip, REF register values are set to be 1.024V or 2.048V through an SPI interface, data is a register value representing expected rotation speed set by the SPI interface, and a digital value range is 0-4096; the rotational speed control adjustment range is 0rpm-16000rpm, and the minimum resolution of rotational speed control is 2rpm.
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Families Citing this family (2)

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CN110504872B (en) * 2019-08-13 2021-12-17 苏州福瑞思信息科技有限公司 Interface circuit and interface system
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2941275A1 (en) * 2015-11-05 2017-05-05 The Boeing Company Eddy current repulsion motor
CN106788126A (en) * 2017-02-21 2017-05-31 合肥工业大学 The control system and its control method of the integrated form direct acting switching mode guiding valve that micro machine drives
CN107110544A (en) * 2014-12-26 2017-08-29 大金工业株式会社 Heat storage type air conditioner
CN107202180A (en) * 2017-07-31 2017-09-26 中国科学院空间应用工程与技术中心 A kind of integrated valve group applied to confined space fluid circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635441A (en) * 1985-05-07 1987-01-13 Sundstrand Corporation Power drive unit and control system therefor
TWI565218B (en) * 2015-06-05 2017-01-01 茂達電子股份有限公司 Motor speed curve control circuit and moter thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107110544A (en) * 2014-12-26 2017-08-29 大金工业株式会社 Heat storage type air conditioner
CA2941275A1 (en) * 2015-11-05 2017-05-05 The Boeing Company Eddy current repulsion motor
CN106788126A (en) * 2017-02-21 2017-05-31 合肥工业大学 The control system and its control method of the integrated form direct acting switching mode guiding valve that micro machine drives
CN107202180A (en) * 2017-07-31 2017-09-26 中国科学院空间应用工程与技术中心 A kind of integrated valve group applied to confined space fluid circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
基于DSP控制的三相逆变电源设计;易柳;黄辉先;苏浩;;机电工程技术(09);全文 *

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