CN203870144U - Phase current detecting circuit of motor of range extender of small electric vehicle - Google Patents
Phase current detecting circuit of motor of range extender of small electric vehicle Download PDFInfo
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- CN203870144U CN203870144U CN201420206350.9U CN201420206350U CN203870144U CN 203870144 U CN203870144 U CN 203870144U CN 201420206350 U CN201420206350 U CN 201420206350U CN 203870144 U CN203870144 U CN 203870144U
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- 239000004606 Fillers/Extenders Substances 0.000 title abstract 2
- 238000005070 sampling Methods 0.000 claims abstract description 19
- 230000003750 conditioning effect Effects 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 11
- 230000005611 electricity Effects 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a phase current detecting circuit of a motor of a range extender of a small electric vehicle. The phase current detecting circuit comprises a 3-shunt current sampling unit, a three-phase current signal conditioning unit, a current peak detection unit and a single-chip microcomputer. The signal input end of the 3-shunt current sampling unit is connected with an output end of an externally-arranged inverting unit; the signal output end is connected with the input end of the three-phase current signal conditioning unit; the output end of the three-phase current signal conditioning unit is connected with the input end of the current peak detection unit and the input end of the single-chip microcomputer; and the output end of the current peak detection unit is connected with the input end of the single-chip microcomputer. The phase current detecting circuit is simple in structure and safe, reliable to use, and capable of providing the single-chip microcomputer with current of winding pairs of all phases of the motor, so current shock of an MSO tube during an electric starting process is effectively reduced, starting efficiency and success rate are improved, and service lifetime of a controller is extended.
Description
Technical field
The utility model relates to a kind of electric component of electric car travel increasing device electricity startup control module, and especially electricity starts the motor three-phase current signal testing circuit that control module is used.
Background technology
In order to ensure that electric car travel increasing device electricity starts the control generator operation of control module safety and stability,, conventionally need to detect the electric current in generator three phase windings, and this current feedback is returned to single-chip microcomputer to realize the real-time monitoring to electric current.For reducing costs, existing distance increasing unit electricity start unit generally adopts 1-shunt circuit to detect electric current, the electric current of sort circuit reflection is not the real electric current of each branch road in fact, the minimum duty cycle of the pwm control signal during not only to startup has requirement, another the most fatal defect is the electric current that cannot detect and control between motor three phase windings, metal-oxide-semiconductor damage to three phase inverter bridge is very large, thereby has reduced the reliability of whole control module.
Summary of the invention
The technical problems to be solved in the utility model is that existing distance increasing unit electricity start unit generally adopts 1-shunt circuit to detect electric current, can not reflect the real electric current of each branch road, the minimum duty cycle of the pwm control signal during not only to startup has requirement, and the metal-oxide-semiconductor damage to three phase inverter bridge is very large, thereby reduce the reliability of whole control module.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of small-sized electric vehicle distance increasing unit electric machine phase current testing circuit, comprises 3-shunt current sampling unit, three-phase current signal conditioning unit, current peak detecting unit and single-chip microcomputer; The signal input part of 3-shunt current sampling unit connects the output terminal of the inversion unit of peripheral hardware, signal output part connects the input end of three-phase current signal conditioning unit, and the output terminal of three-phase current signal conditioning unit connects respectively the input end of current peak detecting unit and the input end of single-chip microcomputer; The output terminal of current peak detecting unit also connects the input end of single-chip microcomputer, and the output terminal of single-chip microcomputer connects and control the control end of each brachium pontis of inverter circuit.
Gather the three-phase output current of inversion unit by 3-shunt current sampling unit, and three-phase current is carried out respectively after signal condition, carry out again peak current detection, single-chip microcomputer reads after three-phase current signal and three-phase peak-current signal simultaneously, according to the ON time of power tube on each brachium pontis in these data calculating inverter circuits, control inversion unit work with this, this kind of design can accurately provide the each phase winding of motor winding right electric current to single-chip microcomputer, effectively reduce the rush of current of metal-oxide-semiconductor in electric start-up course, improved starting efficiency and success ratio.
As a kind of improvement project of the present utility model, described 3-Shunt current sampling unit comprises three shunt current sampling resistors, be connected in one to one between three lower brachium pontis and ground of inversion unit, shunt current sampling resistor connects a current signal output line and is connected to the three-phase input end that three-phase current signal conditioning unit is corresponding with the tie point of corresponding lower brachium pontis.
As another kind of improvement project of the present utility model, three-phase current signal conditioning unit comprises three identical modulate circuits of circuit structure, i.e. U phase signals modulate circuit, V phase current signal modulate circuit, W phase current signal modulate circuit.
The utility model has the advantages that: simple in structure, safe and reliable, it can accurately provide the each phase winding of motor winding right electric current to single-chip microcomputer, effectively reduces the rush of current of metal-oxide-semiconductor in electric start-up course, improve starting efficiency and success ratio, increased the serviceable life of controller.
Brief description of the drawings
Fig. 1 is the existing current detection circuit figure generally adopting.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is modulate circuit schematic diagram in three-phase current signal modulate circuit.
Fig. 4 is three-phase current peak signal testing circuit.
embodiment:
As shown in Figure 1, existing distance increasing unit electricity start unit generally adopts 1-shunt circuit to detect electric current, between the lower brachium pontis of inverter circuit and ground, a shun resistance R 8 is set, current signal leading point is the intersection point place of shun resistance R 8 and lower brachium pontis, the electric current of sort circuit reflection is not the real electric current of each branch road in fact, the minimum duty cycle of the pwm control signal during not only to startup has requirement, another the most fatal defect is the electric current that cannot detect and control between motor three phase windings, metal-oxide-semiconductor damage to three phase inverter bridge is very large, thereby reduce the reliability of whole control module.
As in Figure 2-4, the utility model comprises 3-shunt current sampling unit 2, three-phase current signal conditioning unit 3 and current peak detecting unit 4; After 3-shunt current sampling unit 2 becomes voltage waveform to process by U phase current signal modulate circuit 30, V phase current signal modulate circuit 31, W phase current signal modulate circuit 32 respectively electric machine phase current waveform transformation, all export the AD sample port of peak detection circuit 4 and single-chip microcomputer to; The PWM that the peak-current signal obtaining through peak point current signal deteching circuit 4 transfers to single-chip microcomputer controls mouth.
3-shunt current sampling unit 2 comprises 3 Shunt current sampling resistors, 3 Shunt current sampling resistors are connected between three lower brachium pontis and ground of inversion unit 1, current signal takes out from sampling resistor and the tie point of brachium pontis, delivers to three-phase current signal conditioning unit 3.
As shown in Figure 3-4, described three-phase current signal conditioning unit 3 comprises three identical modulate circuits of circuit, i.e. U phase signals modulate circuit 30, V phase current signal modulate circuit 31, W phase current signal modulate circuit 32; Describe with U phase signals modulate circuit 30, input current signal Ia connecting resistance R7, the other end of R7 is connected with the in-phase input end of operational amplifier, one end of capacitor C 3, one end of resistance R 6, the positive pole of diode D1, the negative pole of diode D2 respectively, another termination power VCC of the negative pole of diode D1 and resistance R 6, the other end ground connection of the positive pole of diode D2 and capacitor C 3.One end of resistance R 9, R10 and capacitor C 4 connects the inverting input of operational amplifier jointly, the output terminal of another termination operational amplifier of resistance R 10 and capacitor C 4.
Current peak detecting unit structure is as follows: the inverting input of the output termination U phase comparator U2 of U phase signals modulate circuit 30 and one end of capacitor C 1, the in-phase input end of another termination comparer U2 of capacitor C 1; The inverting input of the output termination V phase comparator U3 of V phase signals modulate circuit 31 and one end of capacitor C 2, the in-phase input end of another termination comparer U2 of capacitor C 2; The inverting input of the output termination W phase comparator U4 of W phase signals modulate circuit 32 and one end of capacitor C 5, the in-phase input end of another termination comparer U4 of capacitor C 5; One termination power VCC of resistance R 4, its other end is connected with the in-phase input end of 3 comparer U2, U3, U4; Resistance R 11 is connected with the in-phase input end of 3 comparer U2, U3, U4 with the one end after capacitor C 6 parallel connections, other end ground connection.After the output terminal of three comparers connects together, be connected with one end of resistance R 5, and deliver to the PWM control mouthful of single-chip microcomputer, another termination power VCC of resistance R 5.
Claims (3)
1. a small-sized electric vehicle distance increasing unit electric machine phase current testing circuit, is characterized in that: comprise 3-shunt current sampling unit (2), three-phase current signal conditioning unit (3), current peak detecting unit (4) and single-chip microcomputer;
The signal input part of 3-shunt current sampling unit (2) connects the output terminal of the inversion unit (1) of peripheral hardware, signal output part connects the input end of three-phase current signal conditioning unit (3), and the output terminal of three-phase current signal conditioning unit (3) connects respectively the input end of current peak detecting unit (4) and the input end of single-chip microcomputer; The output terminal of current peak detecting unit (4) also connects the input end of single-chip microcomputer;
The output terminal of single-chip microcomputer connects and controls the control end of each brachium pontis of inverter circuit.
2. a kind of small-sized electric vehicle distance increasing unit electric machine phase current testing circuit according to claim 1, it is characterized in that: described 3-Shunt current sampling unit (2) comprises three shunt current sampling resistors, be connected in one to one between three lower brachium pontis and ground of inversion unit (1), shunt current sampling resistor connects a current signal output line and is connected to the three-phase input end that three-phase current signal conditioning unit (3) is corresponding with the tie point of corresponding lower brachium pontis.
3. a kind of small-sized electric vehicle distance increasing unit electric machine phase current testing circuit according to claim 1, it is characterized in that: three-phase current signal conditioning unit (3) comprises three identical modulate circuits of circuit structure, i.e. U phase signals modulate circuit (30), V phase current signal modulate circuit (31), W phase current signal modulate circuit (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420206350.9U CN203870144U (en) | 2014-04-25 | 2014-04-25 | Phase current detecting circuit of motor of range extender of small electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420206350.9U CN203870144U (en) | 2014-04-25 | 2014-04-25 | Phase current detecting circuit of motor of range extender of small electric vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203870144U true CN203870144U (en) | 2014-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420206350.9U Expired - Fee Related CN203870144U (en) | 2014-04-25 | 2014-04-25 | Phase current detecting circuit of motor of range extender of small electric vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203870144U (en) |
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2014
- 2014-04-25 CN CN201420206350.9U patent/CN203870144U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141008 |
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| CF01 | Termination of patent right due to non-payment of annual fee |