CN218601363U - Anti-crosstalk phase current sampling circuit for motor controller - Google Patents
Anti-crosstalk phase current sampling circuit for motor controller Download PDFInfo
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- CN218601363U CN218601363U CN202221891776.3U CN202221891776U CN218601363U CN 218601363 U CN218601363 U CN 218601363U CN 202221891776 U CN202221891776 U CN 202221891776U CN 218601363 U CN218601363 U CN 218601363U
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Abstract
The utility model discloses a motor controller is with anti phase current sampling circuit that disturbs adopts TMR magnetic sensor part, first operational amplifier part, second operational amplifier part, DSADC sampling part; the TMR magnetic sensor portion includes a first TMR current sensor and a second TMR current sensor; the TMR magnetic sensor section is electrically connected to an input terminal of the first operational amplifier section, and an output terminal of the first operational amplifier section is electrically connected to an input terminal of the second operational amplifier section; the output end of the second operational amplifier part is electrically connected with the DSADC sampling part; the second operational amplifier section includes a first differential operational amplifier and a second differential operational amplifier. The utility model discloses the beneficial effect who reaches is: the method has the advantages that calibration is not needed, the range is adjustable, the method can adapt to sampling scenes in various range ranges, and the anti-interference capability is improved due to the adoption of two-stage differential operation amplification.
Description
Technical Field
The utility model relates to a current sampling technical field, especially a phase current sampling circuit is crosstalked in resistance for machine controller.
Background
A traditional PMSM motor phase current sampling scheme adopts a Hall current sensor module mode, an inserted Hall IC is adopted inside the PMSM motor phase current sampling scheme, and current sampling is carried out by utilizing a Hall principle. The Hall current sensor is based on a magnetic balance type Hall principle, according to the Hall effect principle, current Ic is introduced from a control current end of a Hall element, a magnetic field with magnetic induction intensity of B is applied in the normal direction of the plane of the Hall element, and then a potential VH is generated in the direction perpendicular to the current and the magnetic field (namely between Hall output ends), namely the potential VH is called Hall potential, and the magnitude of the potential VH is in direct proportion to the product of the control current I and the magnetic induction intensity of B. In the formula, K is a Hall coefficient and is determined by the material of a Hall element; and I is a control current.
Although the phase current of the motor controller can be sampled by adopting the Hall current sensor module mode, the problems of the need of programming and calibration, fixed measuring range, incapability of adjusting an application end, slow response, poor anti-interference capability and the like exist in the phase current sampling by adopting the Hall current sensor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art and need the programming calibration, it is fixed to measure the range, and the application can't be adjusted, and the response is slow, and the shortcoming of the poor scheduling problem of interference killing feature provides a phase current sampling circuit of anti-crosstalk for electric machine controller.
The purpose of the utility model is realized through the following technical scheme: an anti-crosstalk phase current sampling circuit for a motor controller, comprising: a TMR magnetic sensor section, a first operational amplifier section, a second operational amplifier section, a DSADC sampling section; the TMR magnetic sensor section includes a first TMR current sensor and a second TMR current sensor; the TMR magnetic sensor section is electrically connected to an input terminal of the first operational amplifier section, an output terminal of the first operational amplifier section is electrically connected to an input terminal of the second operational amplifier section; the output end of the second operational amplifier part is electrically connected with the DSADC sampling part; the second operational amplifier section includes a first differential operational amplifier and a second differential operational amplifier.
Preferably, an output terminal of a first TMR current sensor in the TMR magnetic sensor portion is electrically connected to an input terminal of a first differential operational amplifier in a first operational amplifier portion; an output terminal of a second TMR current sensor in the TMR magnetic sensor section is electrically connected to an input terminal of a second differential operational amplifier in the first operational amplifier section.
Preferably, the second operational amplifier section includes a third differential operational amplifier, and the output terminal of the first differential operational amplifier in the first operational amplifier section and the output terminal of the second differential operational amplifier in the first operational amplifier section are electrically connected to the input terminal of the third differential operational amplifier.
Preferably, an output terminal of the third differential operational amplifier is electrically connected to a DSP in the DSADC sampling section.
Preferably, the sampling circuit further comprises a reference circuit, and the reference circuit is a voltage follower output circuit.
Preferably, the output end of the reference circuit is electrically connected to the first differential operational amplifier and the second differential operational amplifier, and the reference circuit provides an operational amplifier bias voltage of 2.5V for the first differential operational amplifier and the second differential operational amplifier.
Preferably, the operational amplification factor of the first differential operational amplifier and the second differential operational amplifier is 1.
Preferably, the operational amplification factor of the third differential operational amplifier is 0.5.
Preferably, the sampling circuit further comprises an anti-crosstalk crossstak module.
The utility model has the advantages of it is following: based on the technical scheme, the utility model discloses a motor controller is with anti phase current sampling circuit that crosstalks adopts TMR magnetic sensor part, first operational amplifier part, second operational amplifier part, DSADC sampling part; the TMR magnetic sensor section includes a first TMR current sensor and a second TMR current sensor; the TMR magnetic sensor section is electrically connected to an input terminal of the first operational amplifier section, and an output terminal of the first operational amplifier section is electrically connected to an input terminal of the second operational amplifier section; the output end of the second operational amplifier part is electrically connected with the DSADC sampling part; the second operational amplifier section includes a first differential operational amplifier and a second differential operational amplifier. The method does not need to calibrate, has adjustable measuring range, can adapt to sampling scenes in various measuring range ranges, and improves the anti-interference capability by adopting two-stage differential operation amplification.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of the sampling circuit of the present invention;
FIG. 2 is a circuit diagram of a first TMR current sensor and a first differential operational amplifier;
FIG. 3 is a circuit diagram of a second TMR current sensor and a second differential operational amplifier;
fig. 4 is a calibration circuit diagram of the present invention;
fig. 5 is a circuit diagram of a third differential operational amplifier of the present invention;
fig. 6 is a schematic diagram of the crosstalk prevention module of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
The invention will be further described with reference to the drawings, but the scope of the invention is not limited to the following.
As shown in fig. 1 to 3, a cross-talk resistant phase current sampling circuit for a motor controller includes: a TMR magnetic sensor section 1, a first operational amplifier section 2, a second operational amplifier section 3, a DSADC sampling section 4; the TMR magnetic sensor section 1 includes a first TMR current sensor 101 and a second TMR current sensor 102; the TMR magnetic sensor section 1 is electrically connected to the input terminal of the first operational amplifier section 2, and the output terminal of the first operational amplifier section 2 is electrically connected to the input terminal of the second operational amplifier section 3; the output end of the second operational amplifier part 3 is electrically connected with the DSADC sampling part 4; the second operational amplifier section 3 includes a first differential operational amplifier 103 and a second differential operational amplifier 104.
Specifically, the output terminal of the first TMR current sensor 101 in the TMR magnetic sensor portion 1 is electrically connected to the input terminal of the first differential operational amplifier 103 in the first operational amplifier portion 2; the output terminal of the second TMR current sensor 102 in the TMR magnetic sensor section 1 is electrically connected to the input terminal of the second differential operational amplifier 104 in the first operational amplifier section 2.
Specifically, as shown in fig. 2 and 3: wherein C1 is a U1 power supply decoupling capacitor; u1 is a first TMR current sensor 101; DC + and DC-are U1 output differential voltage signals; c2 is an operational amplifier IC power supply decoupling capacitor; +2.5V is a reference lift voltage; r1, R2, R4 and R7 are operational amplification factor adjusting resistors, R1 is equal to R4, and R2 is equal to R7; IU1+ output voltage satisfies the formula:
V out_IU1+ ＝2.5+(V 1DC+ -V 1DC- )*(1+R1/R2)；V 1DC+ -V 1DC- ＝S*B；
wherein S is the sensitivity of the sensor chip, and B is the magnetic induction.
C6 in FIG. 3 is a U4 power supply decoupling capacitor; u4 is a second TMR sensor; DC + and DC-are U4 output differential voltage signals; c7 is an operational amplifier IC power supply decoupling capacitor; +2.5V is a reference lift voltage; r14, R16, R13 and R15 are operational amplification factor adjusting resistors, R14 is equal to R13, and R16 is equal to R15; IU 2-output voltage satisfies the formula:
V out_IU+ 2＝2.5+(V 4DC+ -V 4DC- )*(1+R14/R13)；V 4DC+ -V 4DC- ＝S*(-B)；
s is the sensitivity of the sensor chip, and B is the magnetic induction intensity; since the phase difference between U1 and U4 is 180 degrees, the phase difference is-B; the magnetic induction involved in the above formula is a vector with a direction.
The present invention is provided with the above embodiment, the second operational amplifier part 3 includes the third differential operational amplifier 105, the output of the first differential operational amplifier 103 in the first operational amplifier part 2 and the output of the second differential operational amplifier 104 in the first operational amplifier part 2 are electrically connected to the input of the third differential operational amplifier 105.
Specifically, as shown in fig. 5, R6, R10, R3, and R12 are the resistors for adjusting the multiple of the differential operational amplifier, R6 is equal to R10, and R3 is equal to R12; r11 and C5 are a loop phase compensation resistor and a capacitor of the operational amplification circuit; r8 and C4 are output filter RC circuits; IU output voltage satisfies:
Vout_IU＝2.5+(Vout_IU1+-Vout_IU+2)*R3/R6；
the output of the third differential operational amplifier 105 is electrically connected to the DSP in the DSADC sampling section 4.
The utility model discloses in the specification embodiment, sampling circuit still includes reference circuit, as shown in FIG. 4: the reference circuit is a voltage follower output circuit. The output end of the reference circuit is electrically connected with the first differential operational amplifier 103 and the second differential operational amplifier 104, and the bias voltage of the operational amplifier provided by the reference circuit for the first differential operational amplifier 103 and the second differential operational amplifier 104 is 2.5V. Specifically, R17= R18, the +2.5V output impedance is raised using a voltage follower output circuit.
In the embodiment of the present invention, the operational amplification factor of the first differential operational amplifier 103 and the second differential operational amplifier 104 is 1. The operational amplification of the third differential operational amplifier 105 is 0.5.
In an embodiment of the present invention, the sampling circuit further includes an anti-crosstalk crossbar module. As shown in fig. 6: in the figure, icrosstak is crosstalk current, crosstalk magnetic induction intensity generated at U1 and U4 is Bcrosstalk1 and Bcrosstalk2, and the cross-talk current is calculated according to the following formula: v out_IU ＝2.5+(V out_IU1+ -V out_IU+2 )*R3/R6；
V out_IU (1 + R1/R2)) =2.5+ (2 + S + B + S (Bcrosstalk 1-Bcrosstalk 2)) ((1 + R1/R2)) + R3/R6; calculating chip output voltage, and making R3/R6=1/2, so that V out_IU And the sensor is a single-chip sensor, the crosstalk part is Bcrosstalk1 or Bcrosstalk2, and the crosstalk part is 1/2 (Bcrosstalk 1-Bcrosstalk 2), so that the crosstalk influence is greatly reduced.
Based on the technical scheme, the utility model discloses a motor controller is with anti phase current sampling circuit that crosstalks adopts TMR magnetic sensor part 1, first operational amplifier part 2, second operational amplifier part 3, DSADC sampling part 4; the TMR magnetic sensor portion 1 includes a first TMR current sensor 101 and a second TMR current sensor 102; the TMR magnetic sensor portion 1 is electrically connected to the input terminal of the first operational amplifier portion 2, and the output terminal of the first operational amplifier portion 2 is electrically connected to the input terminal of the second operational amplifier portion 3; the output end of the second operational amplifier part 3 is electrically connected with the DSADC sampling part 4; the second operational amplifier section 3 includes a first differential operational amplifier 103 and a second differential operational amplifier 104. The method does not need to calibrate, has adjustable measuring range, can adapt to sampling scenes in various measuring range ranges, and improves the anti-interference capability by adopting two-stage differential operation amplification.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above embodiments only represent preferred embodiments, and the description is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (9)
1. An anti-crosstalk phase current sampling circuit for a motor controller, comprising: TMR magnetic sensor part, first operational amplifier part, second operational amplifier part, DSADC sampling part; the TMR magnetic sensor section includes a first TMR current sensor and a second TMR current sensor; the TMR magnetic sensor section is electrically connected to an input terminal of the first operational amplifier section, an output terminal of the first operational amplifier section is electrically connected to an input terminal of the second operational amplifier section; the output end of the second operational amplifier part is electrically connected with the DSADC sampling part; the second operational amplifier section includes a first differential operational amplifier and a second differential operational amplifier.
2. The anti-crosstalk phase current sampling circuit for the motor controller according to claim 1, wherein: an output terminal of a first TMR current sensor in the TMR magnetic sensor portion is electrically connected to an input terminal of a first differential operational amplifier in a first operational amplifier portion; an output terminal of a second TMR current sensor in the TMR magnetic sensor section is electrically connected to an input terminal of a second differential operational amplifier in the first operational amplifier section.
3. The anti-crosstalk phase current sampling circuit for the motor controller according to claim 1, wherein: the second operational amplifier section includes a third differential operational amplifier, and an output terminal of the first differential operational amplifier in the first operational amplifier section and an output terminal of the second differential operational amplifier in the first operational amplifier section are electrically connected to an input terminal of the third differential operational amplifier.
4. The anti-crosstalk phase current sampling circuit for the motor controller according to claim 3, wherein: and the output end of the third differential operational amplifier is electrically connected with the DSP in the DSADC sampling part.
5. The anti-crosstalk phase current sampling circuit for the motor controller according to claim 1, wherein: the sampling circuit further comprises a reference circuit which is a voltage follower output circuit.
6. The anti-crosstalk phase current sampling circuit for the motor controller according to claim 5, wherein: the output end of the reference circuit is electrically connected with the first differential operational amplifier and the second differential operational amplifier, and the bias voltage of the operational amplifier provided by the reference circuit for the first differential operational amplifier and the second differential operational amplifier is 2.5V.
7. The anti-crosstalk phase current sampling circuit for the motor controller according to claim 1, characterized in that: the operational amplification factor of the first differential operational amplifier and the second differential operational amplifier is 1.
8. The anti-crosstalk phase current sampling circuit for the motor controller according to claim 3, characterized in that: the operational amplification factor of the third differential operational amplifier is 0.5.
9. The anti-crosstalk phase current sampling circuit for the motor controller according to claim 1, characterized in that: the sampling circuit also includes an anti-crosstalk crossstak module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221891776.3U CN218601363U (en) | 2022-07-21 | 2022-07-21 | Anti-crosstalk phase current sampling circuit for motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221891776.3U CN218601363U (en) | 2022-07-21 | 2022-07-21 | Anti-crosstalk phase current sampling circuit for motor controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218601363U true CN218601363U (en) | 2023-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221891776.3U Active CN218601363U (en) | 2022-07-21 | 2022-07-21 | Anti-crosstalk phase current sampling circuit for motor controller |
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| Country | Link |
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| CN (1) | CN218601363U (en) |
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- 2022-07-21 CN CN202221891776.3U patent/CN218601363U/en active Active
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