CN208241641U - Blower variable-pitch is away from magneto phase current sensing and current foldback circuit - Google Patents
Blower variable-pitch is away from magneto phase current sensing and current foldback circuit Download PDFInfo
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- CN208241641U CN208241641U CN201820958792.7U CN201820958792U CN208241641U CN 208241641 U CN208241641 U CN 208241641U CN 201820958792 U CN201820958792 U CN 201820958792U CN 208241641 U CN208241641 U CN 208241641U
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Abstract
Away from magneto phase current sensing and current foldback circuit, including phase current sensing circuit and current foldback circuit, phase current sensing circuit includes current sampling module, front end signal conditioning module and current detection module for a kind of blower variable-pitch；Current foldback circuit included phase current analog-to-digital conversion module and block driving pulse module；The sampling end of current sampling module is connect with the lower bridge arm of permanent magnet motor drives main circuit, and output end is connect with front end signal conditioning module, and the output end of front end signal conditioning module is connect with phase current analog-to-digital conversion module and overcurrent detection module respectively；The output end of current detection module is connect with block driving pulse module and controller respectively；Phase current analog-to-digital conversion module and the output end for blocking driving pulse module are connect with controller.The circuit can be improved the precision of the phase current sensing of magneto, and under the premise of improving current foldback circuit quick response, anti-interference ability, simplify, the structure of optimization overcurrent protection circuit.
Description
Technical field
The utility model relates to technical field of wind power generation, and in particular to a kind of blower variable-pitch is examined away from magneto phase current
Survey and current foldback circuit.
Background technique
Currently, global Wind Power Generation Industry growth momentum is good, and wind-powered electricity generation has become the energy with fastest developing speed in the world.Wind-force hair
Electric capacity of power unit enlargement is the common trend of world's wind energy conversion system development.Fixed pitch wind wheel is difficult to adapt to the list of Wind turbines
Machine the Enlargement Tendency.In contrast, feather wind wheel can bigger efficiency capture wind energy, improve Wind turbines in extreme circumstances
Security performance.Mainstream Wind turbines are all made of variable pitch control mode.Permanent magnetism in electric variable propeller system, as variable pitch power
Motor is general to be driven by AC servo driver.
AC servo driver system generally uses typical Three-loop control structure, including position ring, speed ring and electricity
Flow ring.Wherein, link of the electric current loop as innermost layer needs most fast dynamic adjustment performance to realize the quick of electromagnetic torque
Response, while needing to carry out overcurrent detection and protection to driver, to guarantee magneto safe and reliable operation.For completion pair
The closed-loop control of electric current usually requires that motor driver can detect the electric current of machine winding side.
Currently, the phase current sensing of magneto it is more be using the direct method of measurement, i.e., it is direct by current sensor
Three-phase line current after measuring driver inversion.Specific to the sampling of measuring circuit, it is commonly divided into resistance sampling, Current Mutual Inductance
Device samples and passes through Hall current sensor and samples.The above method is respectively present following disadvantage: resistance sampling is in high pressure, high current
Driving occasion can not be applicable in；Current transformer sampling, since its low frequency characteristic is poor, it is big that low-frequency current examines time determination error；Hall passes
Although sensor sampling can satisfy precision and insulation request, at high cost.
Currently, the overcurrent protection to magneto, usually there is following two method: 1) carrying out modulus to phase current signal and turn
After changing, it is compared judgement with overcurrent threshold values, constitutes the soft protection of overcurrent；2) over-current detection is realized by circuit logic.Phase current
Signal can both derive from DC side bus current, can also can use from the phase current of driver output, logic circuit
FPGA is built, and can also pass through the composition of the logical constructions such as comparator.Though obviously soft protection real-time or stability all
Not as good as hardware overcurrent protection, but the structural difference of hardware current foldback circuit, it also can largely affect overcurrent protection
Actual effect.
Accordingly, it is considered to phase current sensing and the precision of overcurrent protection, quick response and economy, a kind of stabilization, reality are proposed
With, low cost phase current sensing and current foldback circuit, can for wind-force become machine magneto phase current sensing and overcurrent protect
Shield provides hardware supported.
Summary of the invention
In view of the above-mentioned problems of the prior art, the utility model provides a kind of blower variable-pitch away from magneto phase current
Detection and current foldback circuit, which can be improved the precision of the phase current sensing of magneto, and improve overcurrent protection
Under the premise of circuit quick response, anti-interference ability, it can simplify, optimize the structure of overcurrent protection circuit, and economy can be reduced
Cost.
To achieve the goals above, the utility model provides a kind of blower variable-pitch away from magneto phase current sensing and overcurrent
Protect circuit, including phase current sensing circuit and current foldback circuit, the phase current sensing circuit include current sampling module,
Front end signal conditioning module and current detection module；
The current foldback circuit included phase current analog-to-digital conversion module and block driving pulse module；
The current sampling module is connect with the lower bridge arm of permanent magnet motor drives main circuit, at the zero vector moment pair
The three-phase current of main circuit lower bridge arm is sampled and is converted to phase current signal is transferred to front end signal conditioning module again；
The front end signal conditioning module is used to carry out phase current signal isolation amplification, differential amplification and step low-pass to filter
Wave, and export tri- road phase current signal of Liang Zu and arrive phase current analog-to-digital conversion module and overcurrent detection module respectively；
The current detection module is used to carry out add operation to one group of three road phase current signal, obtains current signal all the way
And halfwave rectifier is carried out to get to DC side current signal, then to the DC side current signal to the signal inversion, after rectification
Signal obtains overcurrent logical signal by hysteresis loop comparator, which is finally conveyed to block driving pulse module and control respectively
Device processed；
The phase current analog-to-digital conversion module is used to carry out level boost, reverse phase, electricity to another group of three road phase current signals
Pressing tongs position and A/D are converted into phase current signal, and the phase current signal after conversion is sent to controller；
Block driving pulse module is exported for block driving after receiving overcurrent logical signal, and transmits the signal to control
Device processed.
Further, the current sampling module includes phase current sampling circuit, and the phase current sampling circuit includes adopting
Sample resistance R37, the sampling resistor R37 are powerful four end precision resistance, are connected to inverter lower bridge arm and DC side is negative
Between pole.
Further, the front end signal conditioning module includes isolating amplifier circuit, differential amplifier circuit and step low-pass
Filter adjustable amplifying circuit, the isolating amplifier circuit realize being isolated for the main circuit and control circuit, simultaneously amplify and adopt
The phase current signal of sample resistance R37 output；The differential amplifier circuit realizes differential signal and the institute of isolating amplifier circuit output
State the conversion of second-order low-pass filter adjustable amplifying circuit input signal；The second-order low-pass filter adjustable amplifying circuit includes
For adjusting the adjustable resistance of amplification coefficient.
Further, phase current analog-to-digital conversion module includes level lifting circuit, voltage clamp circuit and ADC, described
It is more than the phase current signal level boost to 0 level that level lifting circuit exports second-order low-pass filter adjustable amplifying circuit；
The voltage clamp circuit is the passive voltage clamp circuit being made of Schottky diode, and the level lifting circuit is exported
Phase current signal clamp down in the ADC safe range.
Further, the overcurrent detection module includes reverse phase adder operation circuit, half-wave rectifying circuit and hysteresis
Comparison circuit, the phase current signal that the reverse phase adder operation circuit exports three road second-order low-pass filter adjustable amplifying circuits
Phase adduction reverse phase；The half-wave rectifying circuit couples the positive direction part for the current signal that reverse phase adder operation circuit exports to
Hysteresis comparison circuit negative input end；The hysteresis comparison circuit includes reference level circuit and hysteresis loop comparator, the reference electricity
Flat input hysteresis loop comparator positive input terminal, the phase current signal and the ginseng that the hysteresis loop comparator export half-wave rectifying circuit
Level is examined to compare, complete motor whether the judgement of overcurrent.
Further, the hysteresis loop comparator is single hysteresis loop comparator.
In the technical scheme, phase current sensing circuit is existed using sampling resistor as sensing element by sampling resistor detection
Zero vector moment, i.e., three upper bridge arm IGBT shutdowns in main circuit, three tri- road electric current of lower bridge arm IGBT open state Shi letters
Number, and the signal is isolated, differential amplification, filtering, level boost and A/D conversion etc. processing, realize to Permanent Magnet and Electric
The detection of machine three-phase current；By the combination of sampling resistor and isolated amplifier, is improving detection accuracy and meeting larger
It is reduced costs while bandwidth；Simultaneously as three sampling resistors are mounted on the lower bridge arm of inverter and DC side power supply is born
Between pole, the high-pressure side of isolated amplifier can be used to power with independent current source all the way, reduces isolated amplifier high-pressure side independence
The quantity of power supply.Current foldback circuit is added three road current signals by adder calculator, calculates DC side electric current
Signal judges whether overcurrent finally by hysteresis loop comparator, and block drives and over-current signal is transferred to controller when overcurrent.By
Motor running is betided at the time of first, third quadrant in overcurrent, only to the one of the DC side current signal positive direction
The work of former six tunnel over-current detection of three-phase current both forward and reverse directions can be completed in road over-current detection, is guaranteeing the full vector moment to master
Under the premise of the over-current detection and protection of circuit, simplifies and optimize circuit.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model.
In figure: 1, main circuit, 2, current sampling module, 3, front end signal conditioning module, 4, phase current analog-to-digital conversion module,
5, overcurrent detection module, 6 locking pulse drive modules, 7, phase current sampling circuit, 8, isolating amplifier circuit, 9, differential amplification
Circuit, 10, second-order low-pass filter adjustable amplifying circuit, 11, adder operation circuit, 12, hysteresis comparison circuit, 13, level boost
Circuit.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As depicted in figs. 1 and 2, a kind of blower variable-pitch is away from magneto phase current sensing and current foldback circuit, including phase
Current detection circuit and current foldback circuit, the phase current sensing circuit include current sampling module 2, front end signal conditioning mould
Block 3 and current detection module 5；
The current foldback circuit included phase current analog-to-digital conversion module 4 and block driving pulse module 6；
The current sampling module 2 is connect with the lower bridge arm of permanent magnet motor drives main circuit 1, at the zero vector moment
The three-phase current of 1 lower bridge arm of main circuit is sampled and is converted to phase current signal and is transferred to front end signal conditioning module 3 again；
The front end signal conditioning module 3 is for carrying out isolation amplification, differential amplification and step low-pass to phase current signal
Filtering, and export tri- road phase current signal of Liang Zu and arrive phase current analog-to-digital conversion module 4 and overcurrent detection module 5 respectively；
The current detection module 5 is used to carry out add operation to one group of three road phase current signal, obtains electric current letter all the way
Number and to the signal inversion to get arrive DC side current signal, then to the DC side current signal carry out halfwave rectifier, after rectification
Signal overcurrent logical signal is obtained by hysteresis loop comparator, finally by the signal respectively be conveyed to block driving pulse module 6
And controller；
The phase current analog-to-digital conversion module 4 is used to carry out level boost, reverse phase, electricity to another group of three road phase current signals
Pressing tongs position and A/D are converted into phase current signal, and the phase current signal after conversion is sent to controller；
Block driving pulse module 6 is exported for block driving after receiving overcurrent logical signal, and is transmitted the signal to
Controller.
The current sampling module 2 includes phase current sampling circuit 7, and the phase current sampling circuit 7 includes sampling resistor
R37, the sampling resistor R37 are powerful four end precision resistance, are connected between inverter lower bridge arm and DC side cathode.
The high-pressure side of isolated amplifier can be used in this way powers with independent current source all the way, and it is independently-powered to reduce isolated amplifier high-pressure side
The quantity of power supply.
The front end signal conditioning module 3 includes isolating amplifier circuit 8, differential amplifier circuit 9 and second-order low-pass filter
Adjustable amplifying circuit 10, the isolating amplifier circuit 8 realize being isolated for the main circuit 1 and control circuit, simultaneously amplify sampling
The phase current signal of resistance R37 output, isolating amplifier circuit 8 include isolation operational amplifier U10 (model AMC1200), electricity
R33, R39, R38 and R41, capacitor C16, C14 and C13 are hindered, the VINN pin and VINP pin difference of operational amplifier U10 is isolated
It is connect by resistance R39 and R33 with resistance R37 close to one end of DC side cathode and close to one end of IGBT in main circuit 1, every
It is connected between VINN pin from operational amplifier U10 and VINP pin by capacitor C16, isolation operational amplifier U10's
VDD1 pin is connect with one end of direct current 3.3V power supply and capacitor C13 respectively, and the other end ground connection of capacitor C13, isolation operation is put
GND1 the and GND2 pin of big device U10 is grounded, be isolated the VDD2 pin of operational amplifier U10 respectively with direct current 3.3V power supply and
VOUTP pin, the VOUTN pin difference of operational amplifier U10 is isolated in one end of capacitor C14, the other end ground connection of capacitor C14
It is connect with one end of one end of resistance R38 and R41；The differential amplifier circuit 9 realizes the difference letter that isolating amplifier circuit 8 exports
Conversion number with 10 input signal of second-order low-pass filter adjustable amplifying circuit, differential amplifier circuit 9 include operation amplifier
Device U11A (model OPA2322AIDR), resistance R30, R34, R40 and R42, capacitor C18 and C19, operational amplifier U11A's
Pin 3 and pin 2 are connect by resistance R34 and R40 with the other end of the other end of resistance R38 and R41 respectively, capacitor C18's
One end is grounded after connecting with one end of capacitor C19, the node between the other end connection resistance R34 and resistance R38 of capacitor C18
On, the other end of capacitor C19 is connected to the node between resistance R40 and resistance R41, and the pin 2 of operational amplifier U11A is also logical
Resistance R42 ground connection is crossed, is connected between the pin 3 and pin 1 of operational amplifier U11A by resistance R30；The step low-pass filter
Wave device adjustable amplifying circuit 10 includes the adjustable resistance for adjusting amplification coefficient, second-order low-pass filter adjustable amplifying circuit 10
Specifically include operational amplifier U11B (model OPA2322AIDR), resistance R35, R32, R36 and R43, capacitor C17 and C15,
The pin 6 of slide rheostat R31, operational amplifier U11B by resistance R36 respectively with one end of resistance R35, resistance R32 one
End is connected with one end of capacitor C17, and the other end of resistance R35 is connect with the pin 1 of operational amplifier U11A, and capacitor C17's is another
One end ground connection, the other end of resistance R32 are connect with a fixing end and sliding end of slide rheostat R31 respectively, slide variable resistance
Another fixing end of device R31 is connect with the pin 7 of operational amplifier U11B, the pin 6 and pin 7 with operational amplifier U11B
It is connected by capacitor C15, the pin 5 of operational amplifier U11B is grounded by resistance R43.
Phase current analog-to-digital conversion module 4 includes level lifting circuit 13, voltage clamp circuit and ADC, and the level mentions
It rises circuit 13 and specifically includes operational amplifier U12A (model OPA2322AIDR), resistance R46, R55 and R56, capacitor C21, two
Pole pipe D9 and D11, the pin 7 of the 2 operational amplifier U11B of pin of operational amplifier U12A connect, and operational amplifier U12A's draws
Connect with the parallel circuit of capacitor C21 between foot 2 and pin 1 by resistance R46, the pin 3 of operational amplifier U12A respectively with
One end of resistance R55 is connected with one end of R56, the other end of the other end of resistance R55 and R56 respectively with direct current 5V power supply and ground
The pin 1 of connection, operational amplifier U12A is connect by diode D9 with direct current 3.3V power supply, the pin of operational amplifier U12A
1 is also grounded by diode D11, the phase current that level lifting circuit 13 exports second-order low-pass filter adjustable amplifying circuit 10
Signal level is promoted to 0 level or more；The voltage clamp circuit is the passive voltage clamper electricity being made of Schottky diode
Road clamps down on the phase current signal that the level lifting circuit 13 exports in the ADC safe range.
The overcurrent detection module 5 includes that reverse phase adder operation circuit 11, half-wave rectifying circuit and hysteresis are more electric
Road 12；
The reverse phase adder operation circuit 11 includes operational amplifier U13A (OPA2322AIDR), resistance R53, R44, electricity
Hold C20, the pin 3 of operational amplifier U13A is grounded by resistance R53, the pin 2 of operational amplifier U13A by resistance R45 and
The pin 1 of operational amplifier U11B connects, and the pin 2 of operational amplifier U13A can also be external in addition by resistance R47 and R50
Two 10 branches of second-order low-pass filter adjustable amplifying circuit, pass through electricity between the pin 2 and pin 1 of operational amplifier U13A
Resistance R44 is connected with the parallel circuit of capacitor C20；Reverse phase adder operation circuit 11 is electric by the adjustable amplification of three road second-order low-pass filters
The phase current signal phase adduction reverse phase that road 10 exports；The electric current that the half-wave rectifying circuit exports reverse phase adder operation circuit 11
The positive direction part of signal is coupled to 12 negative input end of hysteresis comparison circuit；The hysteresis comparison circuit 12 includes comparator U14A
(model LM393), resistance R51, R48, R57, R54, R52, R58 and R49, capacitor C22 and C23, diode D10
(1N4148), the pin 1 that the pin 4 of comparator U14A passes sequentially through resistance R51 and diode D10 and operational amplifier U13A connect
It connects, the pin 4 of comparator U14A is also grounded by the parallel circuit of resistance R48 and capacitor C22, and the pin 5 of comparator U14A is logical
The series circuit ground connection of resistance R52 and R54 are crossed, the node between resistance R52 and R54 passes through the parallel connection of resistance R47 and capacitor C23
Circuit ground is connected between the pin 5 and pin 2 of comparator U14A by circuit R58, and the pin 2 of comparator U14A passes through electricity
Resistance R49 is connect with direct current 3.3V power supply, and hysteresis comparison circuit 12 includes reference level circuit and hysteresis loop comparator, the reference electricity
Flat input hysteresis loop comparator positive input terminal, the phase current signal and the ginseng that the hysteresis loop comparator export half-wave rectifying circuit
Level is examined to compare, complete motor whether the judgement of overcurrent.
In order to simplify over-current detection, the hysteresis loop comparator is single hysteresis loop comparator, i.e., overcurrent is carried out under motoring condition
Detection.Only to motor operation under first, third quadrant state, i.e., the overcurrent under motoring condition is detected.This is to meet
What current detecting required.Especially in the motor-drive circuit for taking resistive load as leading load, motor only operates in electronic
State.
Due to circuit structures and parameters such as the acquisition of three tunnel lower bridge arm current signals, front end signal conditioning and analog-to-digital conversions
Unanimously, only a wherein phase detecting circuit is illustrated here, repeated circuit is not repeated them here, but do not represent its equivalent constructions electricity
Road is not present.
The phase current sampling circuit 2 includes resistance R37；
As shown in Fig. 2, the course of work of phase current sampling circuit 7 are as follows: phase current flows through sampling resistor by terminal J1
R37 forms voltage signal, as original phase current signal at the both ends sampling resistor R37；Preferably, sampling resistor R37 is low
The four-terminal resistance of temperature coefficient.
Isolating amplifier circuit 8 realizes that sampling resistor R37 is close to main electricity by isolation operational amplifier U10 (model AMC1200)
One end of IGBT is coupled to the VINP pin of isolation operational amplifier U10 by R33 in road 1, close to one end of DC side cathode
The VINN pin of isolation operational amplifier U10 is coupled to by R39；Since three road sampling resistor R37 have the same common end i.e.
DC side cathode, therefore the high-pressure side VDD1 of above-mentioned three tunnel isolation operational amplifier U10 can sample same group of 3.3V isolated power supply and supply
Electricity；
9 input terminal of differential amplifier circuit is separately connected isolation operational amplifier U10 pin VOUTP, VOUTN, realizes difference
Amplification, amplification coefficient 1；Operation amplifier chip in differential amplifier circuit 9 is OPA2322；
It is OPA2322 that second-order low-pass filter adjustable amplifying circuit 10, which selects operation amplifier chip, and reverse phase amplification coefficient can lead to
Variable resistance R31 adjustment is crossed, R31 is used to calibrate the amplification coefficient of entire detection circuit, and coefficient adjustment range is 0.5~1.5
Between.Second-order low-pass filter cutoff frequency is determined by C17, R36, C15 value, finally exports the current signal IU_AC of reverse phase, separately
The same structural parameters circuit of outer two-way exports IV_AC and IW_AC respectively；
Level lifting circuit 13 provides the DC offset voltage of 1.5V by R55, R56 bleeder circuit.The level boost
Circuit 13 carries out reverse phase while carrying out level boost, to the phase current signal of input, finally by diode D9, D11 couple
The signal voltage clamper is between 0~3.3V；Since current signal is by reverse phase twice, guarantee that the phase current to analog-to-digital conversion is believed
It is number consistent with former phase current actual current value；
Filtered three roads current signal IU_AC, IV_AC, IW_AC are passed through resistance by reverse phase adder operation circuit 11 respectively
Tri- resistance of R45, R47, R50 are added, then carry out impedance matching and reverse phase to signal by reversed operational amplifier, due to
IU_AC, IV_AC, IW_AC are originally used for inversion signal, and reverse phase gained signal is the DC side electric current letter of non-reverse phase again after addition
Number；
The working principle of hysteresis comparison circuit 12 are as follows: the DC side current signal is inputted by two pole D10 and resistance R51
The reverse input end of voltage comparator U14A (model LM393)；The positive input of voltage comparator U14A by resistance R57 with
The voltage network that R54 is constituted provides reference voltage；Compared with positive feedback resistor R58 constitutes hysteresis with voltage comparator U14A；Pull-up
Resistance R49 connection 3.3V and 12 output end of hysteresis comparison circuit, above-mentioned four part constitute over-current detection circuit；DC side electric current mistake
When stream, 12 negative input end voltage of hysteresis comparison circuit is greater than the maximum value in positive input terminal voltage hysteresis area, hysteresis comparison circuit 12
0V logic level is exported, which is over-current signal TZ, which exports immediately to the block and drive
Circuit, block SVPWM driving output, while transmitting the signal to controller；When DC voltage is down within safe range,
The voltage of 12 negative input end of hysteresis comparison circuit is less than the minimum value in positive input terminal voltage hysteresis area, and hysteresis comparison circuit 12 exports
Output voltage is pulled to 3.3V high level logic by pull-up resistor R49 at this time, and then releases SVPWM block by end open circuit.It needs
It is bright, the over-current detection in the application for simplicity, using single hysteresis loop comparator, only to motor operation first,
Under three quadrant state, i.e., the overcurrent under motoring condition is detected, this meets overcurrent testing requirements, especially with resistive
In motor-drive circuit of the load for leading load, motor only operates in motoring condition.
Claims (6)
1. a kind of blower variable-pitch is away from magneto phase current sensing and current foldback circuit, including phase current sensing circuit and overcurrent
Protect circuit, which is characterized in that the phase current sensing circuit includes current sampling module (2), front end signal conditioning module (3)
And current detection module (5)；
The current foldback circuit included phase current analog-to-digital conversion module (4) and block driving pulse module (6)；
The current sampling module (2) connect with the lower bridge arm of permanent magnet motor drives main circuit (1), at the zero vector moment
The three-phase current of main circuit (1) lower bridge arm is sampled and is converted to phase current signal and is transferred to front end signal conditioning module again
(3)；
The front end signal conditioning module (3) is used to carry out phase current signal isolation amplification, differential amplification and step low-pass to filter
Wave, and export tri- road phase current signal of Liang Zu and arrive phase current analog-to-digital conversion module (4) and overcurrent detection module (5) respectively；
The current detection module (5) is used to carry out add operation to one group of three road phase current signal, obtains current signal all the way
And halfwave rectifier is carried out to get to DC side current signal, then to the DC side current signal to the signal inversion, after rectification
Signal obtains overcurrent logical signal by hysteresis loop comparator, which is finally conveyed to block driving pulse module (6) respectively
And controller；
The phase current analog-to-digital conversion module (4) is used to carry out level boost, reverse phase, voltage to another group of three road phase current signals
Clamper and A/D are converted into phase current signal, and the phase current signal after conversion is sent to controller；
Block driving pulse module (6) is exported for block driving after receiving overcurrent logical signal, and transmits the signal to control
Device processed.
2. blower variable-pitch according to claim 1 exists away from magneto phase current sensing and current foldback circuit, feature
In the current sampling module (2) includes phase current sampling circuit (7), and the phase current sampling circuit (7) includes sampling resistor
R37, the sampling resistor R37 are powerful four end precision resistance, are connected between inverter lower bridge arm and DC side cathode.
3. blower variable-pitch according to claim 1 or 2 is away from magneto phase current sensing and current foldback circuit, feature
It is, the front end signal conditioning module (3) includes isolating amplifier circuit (8), differential amplifier circuit (9) and second-order low-pass filter
Device adjustable amplifying circuit (10), isolating amplifier circuit (8) realization main circuit (1) are isolated with control circuit, simultaneously
Amplify the phase current signal of sampling resistor R37 output；The differential amplifier circuit (9) realizes isolating amplifier circuit (8) output
The conversion of differential signal and second-order low-pass filter adjustable amplifying circuit (10) input signal；The second-order low-pass filter
Adjustable amplifying circuit (10) includes the adjustable resistance for adjusting amplification coefficient.
4. blower variable-pitch according to claim 3 exists away from magneto phase current sensing and current foldback circuit, feature
In phase current analog-to-digital conversion module (4) includes level lifting circuit (13), voltage clamp circuit and ADC, the level boost
It is more than the phase current signal level boost to 0 level that circuit (13) exports second-order low-pass filter adjustable amplifying circuit (10)；
The voltage clamp circuit is the passive voltage clamp circuit being made of Schottky diode, by the level lifting circuit (13)
The phase current signal of output is clamped down in the ADC safe range.
5. blower variable-pitch according to claim 4 exists away from magneto phase current sensing and current foldback circuit, feature
In the overcurrent detection module (5) includes reverse phase adder operation circuit (11), half-wave rectifying circuit and hysteresis comparison circuit
(12), the phase current that the reverse phase adder operation circuit (11) exports three road second-order low-pass filter adjustable amplifying circuits (10)
Signal phase adduction reverse phase；The positive direction portion for the current signal that the half-wave rectifying circuit exports reverse phase adder operation circuit (11)
Divide and is coupled to hysteresis comparison circuit (12) negative input end；The hysteresis comparison circuit (12) includes reference level circuit and hysteresis ratio
Compared with device, the reference level inputs hysteresis loop comparator positive input terminal, the phase that the hysteresis loop comparator exports half-wave rectifying circuit
Current signal compared with the reference level, complete motor whether the judgement of overcurrent.
6. blower variable-pitch according to claim 5 exists away from magneto phase current sensing and current foldback circuit, feature
In the hysteresis loop comparator is single hysteresis loop comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820958792.7U CN208241641U (en) | 2018-06-21 | 2018-06-21 | Blower variable-pitch is away from magneto phase current sensing and current foldback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820958792.7U CN208241641U (en) | 2018-06-21 | 2018-06-21 | Blower variable-pitch is away from magneto phase current sensing and current foldback circuit |
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| CN208241641U true CN208241641U (en) | 2018-12-14 |
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| CN201820958792.7U Expired - Fee Related CN208241641U (en) | 2018-06-21 | 2018-06-21 | Blower variable-pitch is away from magneto phase current sensing and current foldback circuit |
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| Country | Link |
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| CN (1) | CN208241641U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921384A (en) * | 2019-03-21 | 2019-06-21 | 惠州市蓝微电子有限公司 | A kind of brushless electric machine starting short-circuit detecting circuit and detection method |
| CN110829875A (en) * | 2019-12-05 | 2020-02-21 | 哈尔滨理工大学 | Protection design for accurate current detection of three-phase inverter bridge arm |
| CN111398658A (en) * | 2020-04-03 | 2020-07-10 | 北京京源恒泰云科技有限公司 | Isolated current sensor |
| CN114520496A (en) * | 2021-12-22 | 2022-05-20 | 中国航天空气动力技术研究院 | Propeller thermal protection control device and control method |
-
2018
- 2018-06-21 CN CN201820958792.7U patent/CN208241641U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921384A (en) * | 2019-03-21 | 2019-06-21 | 惠州市蓝微电子有限公司 | A kind of brushless electric machine starting short-circuit detecting circuit and detection method |
| CN110829875A (en) * | 2019-12-05 | 2020-02-21 | 哈尔滨理工大学 | Protection design for accurate current detection of three-phase inverter bridge arm |
| CN111398658A (en) * | 2020-04-03 | 2020-07-10 | 北京京源恒泰云科技有限公司 | Isolated current sensor |
| CN111398658B (en) * | 2020-04-03 | 2022-02-11 | 北京京源恒泰云科技有限公司 | Isolated current sensor |
| CN114520496A (en) * | 2021-12-22 | 2022-05-20 | 中国航天空气动力技术研究院 | Propeller thermal protection control device and control method |
| CN114520496B (en) * | 2021-12-22 | 2024-03-12 | 中国航天空气动力技术研究院 | Propeller thermal protection control device and control method |
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Granted publication date: 20181214 |