CN113922686A - Oil immersion pressure-resistant control driver - Google Patents
Oil immersion pressure-resistant control driver Download PDFInfo
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- CN113922686A CN113922686A CN202111012441.XA CN202111012441A CN113922686A CN 113922686 A CN113922686 A CN 113922686A CN 202111012441 A CN202111012441 A CN 202111012441A CN 113922686 A CN113922686 A CN 113922686A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/18—Estimation of position or speed
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/12—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
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- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
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Abstract
The invention relates to an oil immersion compression-resistant control driver which sequentially comprises a direct-current bus filter capacitor plate, a signal conditioning plate, a control plate, a drive plate, an aluminum-based power plate and a heat dissipation block from top to bottom, wherein copper columns are mechanically fixed between plates by means of mounting, and signals between the plates are transmitted by means of a cable assembly and a welding pin assembly. The direct-current bus filter capacitor plate can maintain the voltage of the direct-current bus constant, eliminate external high-frequency differential mode interference and reduce harmonic waves; the signal conditioning board is used for realizing communication with internal and external digital signals; the control panel is used for realizing AD acquisition, position signal decoding, closed-loop control algorithm, PWM generation and the like; the driving plate is used for amplifying the PWM signal; the aluminum-based power board inverts the direct current bus and outputs the inverted direct current bus to the three phases of the motor; the heat dissipation block is used for quickly transferring heat of the power module to a shell surface in contact with seawater. The components related by the invention are screened according to the screening process, and the printed board is subjected to seawater-resistant, oil-resistant and pressure-resistant treatment, so that the design of controlling the oil immersion, pressure resistance, compactness and lightness of the driver is realized.
Description
Technical Field
The invention relates to an oil immersion pressure-resistant control driver, in particular to a full-sea deep underwater vehicle propulsion and servo device control driver, and belongs to the technical field of servo control.
Background
The underwater vehicle propulsion and servo device comprises a propulsion device, a steering engine, an antenna lifting device and the like, and the device generally comprises a transmission mechanism and a control driver. The propulsion and servo device is used as a key component of the underwater unmanned aircraft and is one of important factors for determining whether the unmanned aircraft can successfully complete tasks and safely return, so that the reliability of the underwater unmanned aircraft is the basis for long-term and repeated use.
The existing integrated propulsion and servo device usually adopts the mode that the transmission mechanism part is filled with oil, the control driver part is positioned in a dry pressure-resistant shell, and a cable between the transmission mechanism and the control driver passes through a cabin-penetrating pressure-resistant component, so that the problems of complex structure, large volume, heavy weight and the like exist.
With the increase of the diving depth of the aircraft, the lightweight design becomes an important index for the design and development of the propulsion and servo devices. The control driver is the control core of the propulsion and servo device, the control driver of the propulsion and servo device is arranged in the oil filling mechanism, and the oil pressure balancing device is added outside the mechanism to reduce the wall thickness of a shell material, so that the design requirements of the propulsion and servo device on structure miniaturization, integration, light weight and the like can be met, and the control driver is required to bear the pressure caused by water depth.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the oil immersion pressure-resistant control driver is provided, so that the high integration degree and the light weight design of the propulsion and servo device can be realized on the basis of meeting the requirements of the propulsion of the full-sea deep-sea aircraft and the reliability control of the servo device.
The technical scheme for solving the technical problem is as follows: a control driver for oil immersion pressure resistance comprises a direct current bus filter capacitor plate, a signal conditioning plate, a control plate, a drive plate and an aluminum-based power plate;
the direct-current bus filter capacitor plate is used for filtering the bus voltage and then sending the filtered bus voltage to the signal conditioning plate, the control plate, the drive plate and the aluminum-based power plate for power supply;
the signal conditioning board is used for receiving an externally input position command or a speed command, obtaining a swing angle position command signal or a rotating speed command signal through signal conditioning, and sending the swing angle position command signal or the rotating speed command signal to the control board;
the control board is used for receiving the swing angle position command signal or the rotating speed command signal sent by the signal conditioning board, acquiring phase current and rotor position signals of a motor of the actuating mechanism in real time, performing closed-loop control on the swing angle position command signal by adopting a position ring, a speed ring and a current ring, performing closed-loop control on the rotating speed command signal by adopting the speed ring and the current ring, generating a PWM control signal, and transmitting the PWM signal to the drive board;
the driving board amplifies the power of the PWM signal and transmits the amplified power to the aluminum-based power board;
the aluminum-based power board takes the PWM signal as a switch control signal, inverts the DC bus voltage into frequency-adjustable alternating current and outputs the frequency-adjustable alternating current to a motor of the actuating mechanism, and drives the motor to rotate to finally reach the pointed position or the rotation speed;
the signal conditioning board internally comprises a water leakage detection circuit, and the water leakage detection circuit is used for detecting the voltage difference of two water leakage detection points in oil immersed by the control driver to obtain a water leakage detection analog voltage signal;
the control panel samples and quantizes the water leakage detection analog voltage signal to obtain a water leakage detection voltage value, and the pressure-resisting control driver performs water leakage protection according to the water leakage detection analog voltage value.
Preferably, the water leakage detection circuit comprises resistors R1, R2, R3, R4, capacitors C1, C2, an operational amplifier U1, diodes D1 and D2, wherein one end of the resistors R1, R2 and R3 is connected with a power supply after being connected in series, and the other end of the resistors is grounded;
one end of the first water leakage detection probe J1 is suspended, the other end is connected between the resistor R2 and the resistor R3, and is connected to the non-inverting input end of the operational amplifier U1,
one end of the first water leakage detection probe J2 is suspended, and the other end is grounded in parallel with the resistor R3; the positive power supply terminal of the operational amplifier U1 is connected with the power supply and one end of the capacitor, and the other end of the capacitor is grounded; the negative power supply terminal of the operational amplifier U1 is grounded;
the output end of the operational amplifier U1 is connected with the negative phase input end and is connected with one end of a resistor R4, the other end of the connecting resistor R4 is divided into four paths, and the first path is grounded through a capacitor C2; the second path is grounded through a diode D1, the anode of a diode D1 is grounded, and the cathode of the diode D1 is connected with a resistor R4; the third path is connected with a power supply through a diode D2, the anode of a diode D2 is connected with a resistor R4, and the cathode of the diode D2 is connected with a 3.3V power supply;
the third path is used as the output end of the water leakage detection circuit and outputs a water leakage detection analog voltage signal.
Preferably, the oil immersion pressure-resistant control driver further comprises a direct current bus filter capacitor plate comprising N capacitors, the N capacitors are connected in parallel, the array is arranged, and the number of N is determined according to the size of the space.
Preferably, the direct current bus filter capacitor plate and the signal conditioning plate are fixed through copper pillar assemblies uniformly distributed on the periphery; the direct current bus voltage signal is input through the cable assembly, and is transmitted to the signal conditioning board through the welding pin assembly respectively after passing through the filter capacitor, and the signal between signal conditioning board, control panel, drive plate and the aluminium base power board is also connected through the welding pin assembly.
Preferably, the direct current bus filter capacitor plate and the signal conditioning plate, the control plate, the drive plate and the aluminum-based power plate are fixedly installed through copper pillar assemblies uniformly distributed around.
Preferably, above-mentioned immersion oil resistance to compression type control driver still includes the radiating block, aluminium base power board passes through screw fixed mounting with the radiating block, increase heat conduction insulating pad between aluminium base power board and the radiating block, through the copper post subassembly fixed mounting of equipartition all around between signal conditioning board and the radiating block.
Preferably, the control board detects the magnitude of the analog voltage value according to the water leakage, and the concrete measures for protecting the pressure-resistant control driver against water leakage are as follows:
s1, if the water leakage detection voltage value is larger than the upper limit value of the normal threshold range, reporting a hardware fault, and prompting a worker to check and confirm the product;
s2, if the water leakage detection voltage value [ the upper limit value of the normal threshold range, the lower limit value of the normal threshold range ] is within the interval, reporting no fault;
s3, if the water leakage detection voltage value is within the interval of [ the preset abnormal threshold upper limit value and the normal threshold range lower limit value ], reporting water leakage early warning and prompting workers to check and confirm the product;
and S4, if the water leakage detection voltage value is smaller than the preset abnormal threshold upper limit value, reporting a water leakage fault, prompting a worker to cut off the power supply immediately and then checking and confirming the product state.
Preferably, components on the direct current bus filter capacitor plate, the signal conditioning plate, the control plate, the drive plate and the aluminum-based power plate are screened through a component stress screening process.
Preferably, the direct current bus filter capacitor plate, the signal conditioning plate, the control plate, the drive plate and the aluminum-based power plate are all subjected to three-proofing treatment.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adds a water leakage detection circuit and designs a water leakage protection strategy, and can rapidly report faults under the condition that seawater permeates into the sealed failure cavity;
(2) the direct-current bus filter capacitor plate is added, so that the electromagnetic compatibility of the product is improved;
(3) the environmental stress screening of the components increases the pressure stress screening, and ensures that the components can meet the full-sea deep pressure environment;
(4) according to the invention, the signal transmission between the printed boards adopts the welding pin installation, so that the interruption or the defect of signal transmission caused by the long-time formation of an insulating oil film between the connectors is avoided;
(5) the printed board is subjected to three-proofing process treatment, so that long-time oil immersion work can be realized, the full-sea deep pressure environment can be met, and the printed board can normally work under short-time oil-water mixed immersion;
(6) the invention adopts the aluminum-based power plate, and the heat-conducting insulating pad is additionally arranged between the aluminum-based power plate and the heat dissipation block, so that the heat-conducting efficiency is improved.
Drawings
FIG. 1 is a block diagram of a control actuator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a water leakage detection circuit according to an embodiment of the present invention;
FIG. 3 illustrates a water leakage protection strategy according to an embodiment of the present invention;
FIG. 4 is a DC bus filter circuit according to an embodiment of the present invention;
FIG. 5 is a flow chart of a three-proofing treatment process according to an embodiment of the present invention;
fig. 6 is a flowchart of stress screening for devices according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The invention provides an oil immersion pressure-resistant control driver, which realizes the oil immersion pressure-resistant design of the control driver from the aspects of product reliability design, environmental stress screening design of components, printed board oil immersion process design, compact structure layout and the like, and finally meets the lightweight design requirement of a power execution mechanism.
The invention provides an oil immersion pressure-resistant control driver which comprises a direct-current bus filter capacitor plate 1, a signal conditioning plate 2, a control plate 3, a drive plate 4, an aluminum-based power plate 5, a radiating block 6, fixedly-installed copper column assemblies 9, 10 and 11, a cable assembly 7, welding pin assemblies 8, 13 and 12 and standard parts for installation and fastening;
direct current bus filter capacitor plate 1 for send signal conditioning board 2, control panel 3, drive plate 4, aluminium base power board 5 power supply after carrying out filtering treatment with bus voltage, it has two effects: firstly, the constant of direct current bus voltage can be maintained, secondly, external high-frequency differential mode interference is eliminated, and harmonic waves are reduced.
The signal conditioning board 2 is used for communicating with the inside and outside, binding parameters, conditioning and transmitting signals and the like, receiving position instructions or speed instructions input from the outside, conditioning the signals to obtain swing angle position instruction signals or rotating speed instruction signals, and sending the swing angle position instruction signals or rotating speed instruction signals to the control board 3;
the driving plate 4 amplifies the power of the PWM signal and transmits the amplified power to the aluminum-based power plate 5;
and the aluminum-based power board 5 takes the PWM signal as a switch control signal, inverts the DC bus voltage into frequency-adjustable alternating current and outputs the frequency-adjustable alternating current to a motor of the actuating mechanism, and drives the motor to rotate to finally reach the pointed position or the rotation speed.
The working principle is as follows:
the control driver receives a swing angle position or rotating speed command signal sent by an external control system, acquires state information such as motor phase current and rotor position signals in real time, adopts a control strategy based on rotor magnetic field orientation, adopts a control method of a vector control mode with id being 0 and a voltage space vector pulse modulation technology (SVPWM), and drives an inverter to work by the generated PWM control signal after passing through a position ring, a speed ring and a current ring, so that the modulation of power supply voltage is realized, and the motor is driven to rotate to finally reach a pointed position or rotating speed.
The design method of the invention fully considers the factors of reliability, electromagnetic compatibility, long-time oil immersion process feasibility, pressure resistance, structural layout rationality and the like of the product, and has the main design key points as follows:
(1) water leakage detection circuit
A water leakage detection circuit is additionally arranged in the signal conditioning board 2 and used for detecting the voltage difference between two water leakage detection points in oil immersed in the control driver to obtain a water leakage detection analog voltage signal, so that the problem that the control driver is burnt out due to the fact that water enters the control driver to cause a circuit short circuit under the condition that sealing is invalid is avoided.
As shown in fig. 2, the water leakage detection circuit includes resistors R1, R2, R3, R4, capacitors C1, C2, an operational amplifier U1, diodes D1, D2, resistors R1, R2, and R3 connected in series and then connected to a power supply at one end, and connected to ground (0V) at the other end;
one end of the first water leakage detection probe J1 is suspended, the other end is connected between the resistor R2 and the resistor R3, and is connected to the non-inverting input end of the operational amplifier U1,
one end of the first water leakage detection probe J2 is suspended, and the other end is grounded in parallel with the resistor R3; the positive power supply terminal of the operational amplifier U1 is connected with a power supply (5V) and one end of a capacitor, and the other end of the capacitor is grounded; the negative power supply terminal of the operational amplifier U1 is grounded;
the output end of the operational amplifier U1 is connected with the negative phase input end and is connected with one end of a resistor R4, the other end of the connecting resistor R4 is divided into four paths, and the first path is grounded through a capacitor C2; the second path is grounded through a diode D1, the anode of a diode D1 is grounded, and the cathode of the diode D1 is connected with a resistor R4; the third path is connected with a power supply through a diode D2, the anode of a diode D2 is connected with a resistor R4, and the cathode of the diode D2 is connected with a 3.3V power supply;
and the third path is used as the output end of the water leakage detection circuit and outputs a water leakage detection analog voltage signal Out _ AD.
The direct current bus filter capacitor plate 1 comprises N capacitors, the N capacitors are connected in parallel, the array is arranged, and the number of N is determined according to the size of the space.
(2) Water leakage protection strategy
From the perspective of safety protection in the use of the control driver, the invention adds a water leakage protection strategy besides protection strategies of overvoltage, overcurrent, overtemperature, undervoltage, position detection abnormity and the like of the traditional control driver.
The control panel (3) samples and quantizes the water leakage detection analog voltage signal to obtain a water leakage detection voltage value, and the pressure-resistant control driver is protected against water leakage according to the water leakage detection analog voltage value.
The control panel detects the magnitude of analog voltage value according to leaking, and the concrete measure of antagonizing the pressure type control driver and carrying out the protection of leaking is:
s1, if the water leakage detection voltage value is larger than the upper limit value of the normal threshold range, reporting a hardware fault, and prompting a worker to check and confirm the product; in a specific embodiment of the present invention, the upper limit value of the normal threshold range is 1.8V;
s2, if the water leakage detection voltage value [ the upper limit value of the normal threshold range, the lower limit value of the normal threshold range ] is within the interval, reporting no fault; in a specific embodiment of the present invention, the lower limit of the normal threshold range is 1.5V;
s3, if the water leakage detection voltage value is within the interval of [ the preset abnormal threshold upper limit value and the normal threshold range lower limit value ], reporting water leakage early warning and prompting workers to check and confirm the product; in a specific embodiment of the invention, the upper limit value of the preset abnormal threshold is 1.2V;
and S4, if the water leakage detection voltage value is smaller than the preset abnormal threshold upper limit value, reporting a water leakage fault, prompting a worker to cut off the power supply immediately and then checking and confirming the product state.
(3) Electromagnetic compatibility design
The design method of the invention is based on the electromagnetic compatibility, and adds the direct current bus filter capacitor plate, namely, the direct current voltage of the bus is kept constant, and the high-frequency differential mode interference generated by the inductive load through a power device can be eliminated, and the harmonic wave is reduced.
The direct current bus filter circuit is composed of forty-eight capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33, C34, C35, C36, C37, C38, C39, C40, C41, C42, C43, C44, C45, C46, C47 and C48, wherein the forty-eight capacitors are connected in parallel, one end of the positive input of the power supply is connected with the negative output of the power supply, and the other end of the negative output of the power supply.
The type of capacitor is selected taking into account two factors: firstly, the voltage resistance is at least 1.5 times of the working voltage; and the second is a capacity value which corresponds to 1uF according to the rated working condition power 1W. The quantity of the capacitors is selected according to the size of the installation space, and a certain quantity of capacitors are connected in series and in parallel.
(4) Reliable thermal design method
According to the rule of heat propagation, the elements of the heat source are analyzed and reasonably distributed. The power device is used as a heat source element, the radiating surface of the power device is fixed on an aluminum substrate, the aluminum substrate is fixed with the base, and heat-conducting insulating pads are filled between the radiating surface of the element and the aluminum substrate and between the aluminum substrate and the base, so that the heat-conducting efficiency is improved. The base is fixedly arranged on the inner surface of the shell which is in direct contact with the seawater by fully utilizing the heat dissipation condition of the external seawater.
Preferably, the pressure-resistant control driver is additionally provided with a heat dissipation block 6, the aluminum-based power board 5 and the heat dissipation block 6 are fixedly installed through screws, a heat conduction insulating pad is additionally arranged between the aluminum-based power board 5 and the heat dissipation block 6, and the signal conditioning board 2 and the heat dissipation block 6 are fixedly installed through copper column assemblies uniformly distributed all around.
(5) Three-proofing treatment of printed board
The printed board for controlling the driver needs to be soaked in oil for a long time, and corresponding protective measures need to be taken for the printed board in order to prevent the corrosivity and the destructiveness of the environment to the printed board. The direct current bus filter capacitor plate 1, the signal conditioning plate 2, the control plate 3, the drive plate 4 and the aluminum-based power plate 5 are all subjected to three-proofing treatment, and the design method for the three-proofing treatment of the printed plate is shown in a process flow shown in figure 4 and comprises the following steps:
s1, carrying out three-proofing dipping treatment on the printed board with the single board debugged;
s2, drying in a high-temperature box;
s3, carrying out secondary dipping treatment on the printed board, and then executing the step S2;
s4, welding and assembling the plates according to the assembly flow, and debugging;
s5, coating a three-proofing paint on the root of the welding point, and then executing a step S2;
and S6, coating the three-proofing paint on the root of the welding point for the second time, and then executing the step S2.
(6) Stress screening design method for components
The method is different from the traditional electronic component environmental stress screening process in that components on the direct current bus filter capacitor plate 1, the signal conditioning plate 2, the control plate 3, the drive plate 4 and the aluminum-based power plate 5 are screened through the component stress screening process. The method specifically comprises the following steps: in the aspect of component selection, whether a cavity exists in a component is firstly confirmed, and then screening is carried out according to a designed component stress screening process, as shown in fig. 3. Only qualified components can be equipped with a control driver.
The screening process of the components is as follows:
s1, performing appearance inspection on all components, and removing the components with obvious damage, scratch and external force on the surface;
s2, checking the functions and the performances of the components, and removing the components with defective functions and performances;
s3, screening the vibration stress of the components, and then carrying out S1 and S2;
s4, performing temperature cycle aging stress screening on the components, and then performing S1 and S2;
s5, performing pressure stress screening on the components, and then performing S1 and S2;
and S6, assembling the screened components on a printed board.
(7) Design method for avoiding signal transmission open circuit between boards
The invention provides a design method for avoiding signal transmission open circuit between control driver boards.A direct current bus filter capacitor board 1 and a signal conditioning board 2 between circuit boards, the signal conditioning board 2 and a control board 3, the control board 3 and a drive board 4, and signal connection pins between the drive board 4 and an aluminum-based power board 5 are directly welded by pins.
The signal between the circuit boards is directly welded by the welding pins, so that the phenomenon that the root of a welding wire is broken in cable connection or signal transmission is interrupted or poor due to the fact that an insulating oil film is formed between the inserting connectors for a long time can be prevented.
(8) High integration level layout design method
The direct-current bus filter capacitor plate 1, the signal conditioning plate 2, the control panel 3, the drive plate 4, the aluminum-based power plate 5 and the radiating block 6 are fixedly installed through the copper column assemblies 9, 10 and 11, so that the miniaturization, integration and compactness of a control driver are realized, and the integrated design requirement is met.
The direct current bus filter capacitor plate 1 and the signal conditioning plate 2 are fixed through copper pillar assemblies uniformly distributed on the periphery; the direct current bus voltage signal is input through the cable assemblies 7-1 and 7-2, and is transmitted to the signal conditioning board 2 through the welding pin assemblies 8-1 and 8-2 respectively after passing through the filter capacitor. The direct current bus filter capacitor plate 1 and the signal conditioning plate 2 are fixedly installed through copper column assemblies 9-1, 9-2, 9-3 and 9-4 which are uniformly distributed on the periphery. Signals among the signal conditioning board 2, the driving board 4 and the aluminum-based power board 5 are also connected through the welding pin assembly. The method specifically comprises the following steps: the control signal between the signal conditioning board 2 and the control board 3 is transmitted through the welding pin assembly 12; the motors among the signal conditioning board 2, the driving board 4 and the aluminum-based power board 5 are connected through welding pin assemblies 13-1, 13-2 and 13-3, the ground wire is connected through the welding pin assembly 13-4, and the direct current bus is connected through the welding pin assemblies 13-5 and 13-6.
The direct-current bus filter capacitor plate 1 and the signal conditioning plate 2, the control plate 3, the drive plate 4 and the drive plate 4 are fixedly installed through copper column assemblies 11-1, 11-2, 11-3 and 11-4 which are uniformly distributed on the periphery of the aluminum-based power plate 5.
The signal conditioning board 2 and the heat dissipation block 6 are fixedly installed through copper column assemblies 10-1, 10-2, 10-3 and 10-4 which are uniformly distributed on the periphery.
As shown in fig. 1, an aluminum-based power board 5, a heat conducting insulating pad and a heat dissipation block 6 are fixedly connected through a screw, an elastic pad and a flat pad;
as shown in fig. 1, fixedly connecting a copper column assembly 11 to four uniformly distributed mounting holes of an aluminum-based power board 5, correspondingly penetrating the copper column assembly 11 through the four uniformly distributed mounting holes of a driving board 4, penetrating welding pins on the aluminum-based power board 5 after aligning with the welding holes of the driving board 4, welding the welding pins after fixedly connecting the driving board 4 with the aluminum-based power board 5, and performing coating treatment on welding roots;
as shown in fig. 1, four uniformly distributed mounting holes of the control plate 3 correspondingly penetrate through the copper pillar assembly 11, welding pins on the drive plate 4 penetrate through the control plate 3 after being aligned with the welding holes, the welding pins are welded after the control plate 3 is fixedly connected with the drive plate 4, and three-proofing coating treatment is performed on a welding root;
as shown in fig. 1, a copper column assembly 10, a flat pad and an elastic pad are fixedly connected to four uniformly distributed mounting holes of a heat dissipation block 6, a mounting hole of a signal conditioning board 2 penetrates through the copper column assembly 10 through an insulating pad, a welding pin on a control board 3 penetrates through the copper column assembly after being aligned with a welding hole of the signal conditioning board 2, the insulating pad, the flat pad and the elastic pad are additionally arranged on the copper column assembly 10 and then fixedly connected through a copper column assembly 9, the welding pin is welded, and the welding root is subjected to three-proofing coating treatment;
as shown in fig. 1, the mounting hole of the dc bus filter capacitor plate 1 passes through the copper pillar assembly 9 through the insulating pad, the welding pin on the signal conditioning plate 2 passes through the copper pillar assembly 9 after being aligned with the welding hole of the dc bus filter capacitor plate 1, the insulating pad, the flat pad and the spring pad are added on the copper pillar assembly 9 and then fixedly connected by the screw, the welding pin is welded, and the welding root is subjected to three-proofing coating treatment.
As shown in fig. 1, the integrally installed control driver may attach the heat slug 6 to the inner surface of the housing by screws.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (9)
1. An oil immersion pressure-resistant control driver is characterized by comprising a direct-current bus filter capacitor plate (1), a signal conditioning plate (2), a control plate (3), a drive plate (4) and an aluminum-based power plate (5);
the direct-current bus filter capacitor plate (1) is used for transmitting bus voltage after filtering processing to the signal conditioning plate (2), the control plate (3), the drive plate (4) and the aluminum-based power plate (5) for power supply;
the signal conditioning board (2) is used for receiving an externally input position command or a speed command, obtaining a swing angle position command signal or a rotating speed command signal through signal conditioning, and sending the swing angle position command signal or the rotating speed command signal to the control board (3);
the control board (3) is used for receiving a swing angle position instruction signal or a rotating speed instruction signal sent by the signal conditioning board (2), acquiring phase current and rotor position signals of a motor of the actuating mechanism in real time, performing closed-loop control on the swing angle position instruction signal by adopting a position ring, a speed ring and a current ring, performing closed-loop control on the rotating speed instruction signal by adopting the speed ring and the current ring, generating a PWM control signal, and transmitting the PWM signal to the drive board (4);
the driving board (4) is used for amplifying the PWM signal power and transmitting the amplified PWM signal power to the aluminum-based power board (5);
the aluminum-based power board (5) takes the PWM signal as a switch control signal, inverts the DC bus voltage into frequency-adjustable alternating current and outputs the frequency-adjustable alternating current to a motor of the actuating mechanism, and drives the motor to rotate to finally reach the pointed position or the rotating speed;
the signal conditioning board (2) internally comprises a water leakage detection circuit, and the water leakage detection circuit is used for detecting the voltage difference of two water leakage detection points in oil immersed by the control driver to obtain a water leakage detection analog voltage signal;
the control panel (3) samples and quantizes the water leakage detection analog voltage signal to obtain a water leakage detection voltage value, and the pressure-resistant control driver is protected against water leakage according to the water leakage detection analog voltage value.
2. The oil-immersed pressure-resistant control driver as claimed in claim 1, wherein the water leakage detection circuit comprises resistors R1, R2, R3, R4, capacitors C1, C2, an operational amplifier U1, diodes D1, D2, resistors R1, R2, R3 connected in series and connected to a power supply at one end and to ground at the other end;
one end of the first water leakage detection probe J1 is suspended, the other end is connected between the resistor R2 and the resistor R3, and is connected to the non-inverting input end of the operational amplifier U1,
one end of the first water leakage detection probe J2 is suspended, and the other end is grounded in parallel with the resistor R3; the positive power supply terminal of the operational amplifier U1 is connected with the power supply and one end of the capacitor, and the other end of the capacitor is grounded; the negative power supply terminal of the operational amplifier U1 is grounded;
the output end of the operational amplifier U1 is connected with the negative phase input end and is connected with one end of a resistor R4, the other end of the connecting resistor R4 is divided into four paths, and the first path is grounded through a capacitor C2; the second path is grounded through a diode D1, the anode of a diode D1 is grounded, and the cathode of the diode D1 is connected with a resistor R4; the third path is connected with a power supply through a diode D2, the anode of a diode D2 is connected with a resistor R4, and the cathode of the diode D2 is connected with a 3.3V power supply;
the third path is used as the output end of the water leakage detection circuit and outputs a water leakage detection analog voltage signal.
3. An oil-immersed pressure-resistant control actuator as claimed in claim 2, further comprising a dc bus filter capacitor plate (1) including N capacitors, wherein the N capacitors are connected in parallel, and the array is arranged, and the number of N is determined according to the size of the space.
4. The oil immersion pressure-resistant control driver as claimed in claim 1, wherein the direct current bus filter capacitor plate (1) and the signal conditioning plate (2) are fixed by copper pillar assemblies uniformly distributed around; direct current bus voltage signals are input through the cable assemblies (7-1, 7-2), are transmitted to the signal conditioning board (2) through the welding pin assemblies (8-1, 8-2) after passing through the filter capacitor, and signals among the signal conditioning board (2), the control board (3), the drive board (4) and the aluminum-based power board (5) are also connected through the welding pin assemblies.
5. The oil-immersed pressure-resistant control driver as claimed in claim 1, wherein the direct current bus filter capacitor plate (1) and the signal conditioning plate (2), the control plate (3), the drive plate (4), and the drive plate (4) and the aluminum-based power plate (5) are fixedly mounted through copper pillar assemblies uniformly distributed around.
6. The oil-immersed pressure-resistant control driver as claimed in claim 1, further comprising a heat dissipation block (6), wherein the aluminum-based power board (5) and the heat dissipation block (6) are fixedly mounted through screws, a heat-conducting insulating pad is additionally arranged between the aluminum-based power board (5) and the heat dissipation block (6), and the signal conditioning board (2) and the heat dissipation block (6) are fixedly mounted through copper pillar assemblies uniformly distributed around.
7. The oil-immersed pressure-resistant control driver as claimed in claim 1, wherein the control board detects the magnitude of the analog voltage according to water leakage, and the specific measures for protecting the pressure-resistant control driver against water leakage are as follows:
s1, if the water leakage detection voltage value is larger than the upper limit value of the normal threshold range, reporting a hardware fault, and prompting a worker to check and confirm the product;
s2, if the water leakage detection voltage value [ the upper limit value of the normal threshold range, the lower limit value of the normal threshold range ] is within the interval, reporting no fault;
s3, if the water leakage detection voltage value is within the interval of [ the preset abnormal threshold upper limit value and the normal threshold range lower limit value ], reporting water leakage early warning and prompting workers to check and confirm the product;
and S4, if the water leakage detection voltage value is smaller than the preset abnormal threshold upper limit value, reporting a water leakage fault, prompting a worker to cut off the power supply immediately and then checking and confirming the product state.
8. The oil immersion pressure-resistant control driver as claimed in claim 1, wherein components on the direct current bus filter capacitor plate (1), the signal conditioning plate (2), the control plate (3), the drive plate (4) and the aluminum-based power plate (5) are screened through a component stress screening process.
9. The oil immersion pressure-resistant control driver as claimed in claim 1, wherein the direct current bus filter capacitor plate (1), the signal conditioning plate (2), the control plate (3), the drive plate (4) and the aluminum-based power plate (5) are all subjected to three-proofing treatment.
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