CN110133360A - Double AD channel AC electric machine phase current sample circuits - Google Patents
Double AD channel AC electric machine phase current sample circuits Download PDFInfo
- Publication number
- CN110133360A CN110133360A CN201910225316.3A CN201910225316A CN110133360A CN 110133360 A CN110133360 A CN 110133360A CN 201910225316 A CN201910225316 A CN 201910225316A CN 110133360 A CN110133360 A CN 110133360A
- Authority
- CN
- China
- Prior art keywords
- circuit
- current
- selection circuit
- channel
- electric machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of double AD channel AC electric machine phase current sample circuits, including differential amplifier circuit, first follow-compare selection circuit, the first RC filter circuit, inverse proportion circuit, second to follow-compare selection circuit and the 2nd RC filter circuit.The present invention distinguishes the positive half cycle and negative half period of sample motor phase current using two ADC channels, the ADC maximum range of the current sample of half cycle each in this way can accomplish 0~4095, compare single channel ADC sampling plan, the positive half cycle of motor+negative half-cycle current sampling AD range is 0~4095, and range expands one times.The precision of current sample at least doubles, and has greatly improved to motor control.
Description
Technical field:
The present invention relates to a kind of double AD channel AC electric machine phase current sample circuits, belong to new energy electric automobile motor
Drive technology field.
Background technique:
Global energy and environment are faced with huge challenge at present, and automobile is big as consumption of petroleum and CO2 emission
Family needs to carry out revolutionary change.In order to reduce the discharge of carbon dioxide, new-energy automobile is developed in the world
Reach common understanding.Motor is the kernel component of new-energy automobile, realizes the conversion between electric energy and mechanical energy.New energy vapour at present
Garage's industry mainly uses AC permanent magnet synchronous motor and AC induction motor.With the development of industry, people are to new-energy automobile
It is required that higher and higher.The precision for how improving motor control, becomes the problem of everybody becomes more concerned with.Current of electric is as motor
One important parameter of control, improves the precision of current sample, is the key that improve one of motor control.Current of electric is adopted at present
Sample be by Hall sensor by electric current be converted to relationship be VOUT=K*IP+B voltage signal, then be fed to sample circuit into
The channel AD that row ratio enlargement and central point adjusting are sent to processor is sampled.Processor with the C2000 series of TI is
Example, AD sample range are 0~4095.It is well known that alternating current generator phase current output waveform, similar to sine wave, electric current includes just half
Week and negative half period.What the method for single AD channel sample electric current was commonly used is to utilize 0~2047 sampling negative half period, 2047~4095
Sample negative half period.The resolution ratio of such current sample can be very low, can not further increase the precision of current sample.
Therefore, it is necessory to be improved to the prior art to solve the deficiency of the prior art.
Summary of the invention:
The present invention is to provide a kind of double AD channel AC motor phase electricity to solve the above-mentioned problems of the prior art
Sample circuit is flowed, positive axis electric current is sampled using AD first passage, samples negative half-cycle current using AD second channel, this
The AD range of the positive-negative half-cycle current sample of sample phase current can reach 0~4095, and resolution ratio doubles.
The present invention adopts the following technical scheme: a kind of double AD channel AC electric machine phase current sample circuits, including difference are put
Big circuit, first follow, and-compare selection circuit, the first RC filter circuit, inverse proportion circuit, second follow-compares selection circuit
And the 2nd RC filter circuit, current sample sensor are open loop Hall current sensors, output voltage and measurement electric current
Relationship is VOUT=G*IP+VCC/2, and wherein IP is the electric current of flows through sensor, and G is proportionality coefficient, and VCC is Hall sensor
Power supply, output V1=(R2/R1) * G*IP after differential amplifier circuit, by by operational amplifier and diode
The first of composition follows-compares selection circuit to select the big part voltage value ratio GND, then follows-compare selection electricity by first
The relational expression of V2 and IP is V3=(R2/R1) * G*IP (IP >=0) behind road；V3=0 (IP < 0), V3 pass through the first RC filtered electrical
It is sent to the sampling for carrying out electric machine phase current positive half cycle in ADC first passage after routing R5 and C1 filtering, while V1 is sent into inverse ratio
Example circuit, then the relational expression of V2 and IP is V2=- (R2/R1) * G*IP after inverse proportion circuit, and V4 is followed-compared by second
Follow+compare selection circuit to select the big part voltage value ratio GND by what operational amplifier and diode formed compared with selection circuit,
Then the relational expression of V2 and IP is V4=0 (IP >=0) after first follows-compare selection circuit；V4=- (R2/R1) * G*IP
(IP < 0), V4 is sent in ADC second channel after the first RC filter circuit is by R5 and C1 filtering carries out electric machine phase current negative half
The sampling in week.
The invention has the following beneficial effects: the present invention to utilize just the half of two ADC channel difference sample motor phase currents
Week and negative half period, the ADC maximum range of the current sample of half cycle each in this way can accomplish 0~4095, compare single channel ADC
Positive half cycle+negative half-cycle current sampling AD range of sampling plan, motor is 0~4095, and range expands one times.Current sample
Precision at least double, have greatly improved to motor control.
Detailed description of the invention:
Fig. 1 is the double AD channel AC electric machine phase current sample circuit figures of the present invention.
Specific embodiment:
The present invention will be further described below with reference to the drawings.
AD channel AC electric machine phase current sample circuits of the invention double include differential amplifier circuit 1, first follow-compare choosing
It selects circuit 2, the first RC filter circuit 3, inverse proportion circuit 4, second follow-compare selection circuit 5 and the 2nd RC filter circuit
6, new-energy automobile industry current sample sensor mainly uses open loop Hall current sensor at present.Its output voltage and
The relationship for measuring electric current is VOUT=G*IP+VCC/2, and wherein IP is the electric current of flows through sensor, and G is proportionality coefficient, and VCC is
The power supply of Hall sensor, output V1=(R2/R1) * G*IP after differential amplifier circuit 1, by being put by operation
The first of big device and diode composition follows-compare selection circuit 2 to select the big part voltage value ratio GND, and to select motor defeated
The positive half cycle current of electric current out, then the relational expression of V2 and IP is V3=(R2/R1) * after first follows-compare selection circuit 2
G*IP (IP >=0)；V3=0 (IP < 0), V3 are sent in ADC first passage after the first RC filter circuit 3 is by R5 and C1 filtering
Carry out the sampling of electric machine phase current positive half cycle.V1 is sent into inverse proportion circuit 4 simultaneously, then the V2 and IP after inverse proportion circuit
Relational expression is V2=- (R2/R1) * G*IP.V4 follows-compares selection circuit 5 by operational amplifier and diode group by second
At follow+compare selection circuit select the big part voltage value ratio GND select motor output electric current negative half-cycle current
It is sampled, then the relational expression of V2 and IP is V4=0 (IP >=0) after first follows-compare selection circuit 2；V4=-
(R2/R1) (IP < 0) * G*IP, V4 are sent in ADC second channel after the first RC filter circuit 3 is by R5 and C1 filtering and carry out
The sampling of electric machine phase current negative half period.
The principle of AD channel AC electric machine phase current sample circuit of the present invention is as follows:
1. current sensor output meets precision and gain requirement through 1 enhanced processing of differential amplifier circuit；
2, since current signal is dextrorotation signal, after premenstrual grade differential amplifier circuit 1 is handled, positive half cycle via first with
With-compare selection circuit 2 and carry out with amiable Zero-cross comparator, negative half-cycle signal carries out reverse phase processing by inverse proportion circuit 4, by signal
Positive half cycle is reversed to by negative half period, then follow-compare selection circuit 5 to carry out by second signal follows and Zero-cross comparator is handled.
3, by treated signal, RC filter is carried out via the first RC filter circuit 3, the 2nd RC filter circuit 6 respectively
Wave is sent respectively to the AD sample port processing of dsp chip.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
It for member, can also make several improvements without departing from the principle of the present invention, these improvement also should be regarded as of the invention
Protection scope.
Claims (1)
1. a kind of double AD channel AC electric machine phase current sample circuits, it is characterised in that: including differential amplifier circuit (1), first
Follow-compare selection circuit (2), the first RC filter circuit (3), inverse proportion circuit (4), second to follow-compare selection circuit (5)
And the 2nd RC filter circuit (6), current sample sensor are open loop Hall current sensor, output voltage and measurement electric current
Relationship be VOUT=G*IP+VCC/2, wherein IP be flows through sensor electric current, G is proportionality coefficient, and VCC is Hall sensor
Power supply, output V1=(R2/R1) * G*IP after differential amplifier circuit (1), by by operational amplifier and two poles
The first of pipe composition follows-compares selection circuit (2) to select the big part voltage value ratio GND, then follows-compare choosing by first
The relational expression for selecting circuit (2) V2 and IP afterwards is V3=(R2/R1) * G*IP (IP >=0)；V3=0 (IP < 0), V3 pass through the first RC
Filter circuit (3) carries out the sampling of electric machine phase current positive half cycle by being sent to after R5 and C1 filtering in ADC first passage, while by V1
It is sent into inverse proportion circuit (4), then the relational expression of V2 and IP is V2=- (R2/R1) * G*IP after inverse proportion circuit, and V4 passes through
Second follows, and-comparing selection circuit (5) to be followed by what operational amplifier and diode formed+compares selection circuit and selects voltage value
The part bigger than GND, then the relational expression of V2 and IP is V4=0 (IP >=0) after first follows-compare selection circuit (2)；
V4=- (R2/R1) * G*IP (IP < 0), V4 are sent to ADC second channel after the first RC filter circuit (3) is by R5 and C1 filtering
The interior sampling for carrying out electric machine phase current negative half period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910225316.3A CN110133360A (en) | 2019-03-25 | 2019-03-25 | Double AD channel AC electric machine phase current sample circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910225316.3A CN110133360A (en) | 2019-03-25 | 2019-03-25 | Double AD channel AC electric machine phase current sample circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110133360A true CN110133360A (en) | 2019-08-16 |
Family
ID=67568754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910225316.3A Pending CN110133360A (en) | 2019-03-25 | 2019-03-25 | Double AD channel AC electric machine phase current sample circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110133360A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4520298A (en) * | 1984-04-03 | 1985-05-28 | Westinghouse Electric Corp. | Method and apparatus for sampling output AC currents in a voltage-fed inverter power supply |
| CA2106290A1 (en) * | 1992-01-03 | 1995-03-16 | Robert W. Beckwith | Method and apparatus providing half-cycle digitization of ac signals by an analog-to-digital converter |
| CN102486491A (en) * | 2010-12-03 | 2012-06-06 | 比亚迪股份有限公司 | Method and system for detecting unbalance of positive half cycle current and negative half cycle current of alternating current |
| CN102495275A (en) * | 2011-12-20 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | High-precision current detection circuit based on CPU (Central Processing Unit) |
| CN202281806U (en) * | 2011-08-09 | 2012-06-20 | 南京南瑞继保电气有限公司 | Redundancy sampling processing device based on dual AD channels |
| CN202634348U (en) * | 2012-04-19 | 2012-12-26 | 珠海格力电器股份有限公司 | Motor and current sampling circuit thereof |
| CN203981773U (en) * | 2014-08-08 | 2014-12-03 | 哈尔滨同为电气股份有限公司 | A kind of signal conditioning circuit of active power filtering controller |
| CN104283413A (en) * | 2013-07-01 | 2015-01-14 | 中兴通讯股份有限公司 | Method for controlling bridgeless PFC circuit and device thereof |
| CN205656227U (en) * | 2016-03-08 | 2016-10-19 | 武汉合康智能电气有限公司 | On -vehicle motor output current sampling circuit that fills |
-
2019
- 2019-03-25 CN CN201910225316.3A patent/CN110133360A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4520298A (en) * | 1984-04-03 | 1985-05-28 | Westinghouse Electric Corp. | Method and apparatus for sampling output AC currents in a voltage-fed inverter power supply |
| CA2106290A1 (en) * | 1992-01-03 | 1995-03-16 | Robert W. Beckwith | Method and apparatus providing half-cycle digitization of ac signals by an analog-to-digital converter |
| CN102486491A (en) * | 2010-12-03 | 2012-06-06 | 比亚迪股份有限公司 | Method and system for detecting unbalance of positive half cycle current and negative half cycle current of alternating current |
| CN202281806U (en) * | 2011-08-09 | 2012-06-20 | 南京南瑞继保电气有限公司 | Redundancy sampling processing device based on dual AD channels |
| CN102495275A (en) * | 2011-12-20 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | High-precision current detection circuit based on CPU (Central Processing Unit) |
| CN202634348U (en) * | 2012-04-19 | 2012-12-26 | 珠海格力电器股份有限公司 | Motor and current sampling circuit thereof |
| CN104283413A (en) * | 2013-07-01 | 2015-01-14 | 中兴通讯股份有限公司 | Method for controlling bridgeless PFC circuit and device thereof |
| CN203981773U (en) * | 2014-08-08 | 2014-12-03 | 哈尔滨同为电气股份有限公司 | A kind of signal conditioning circuit of active power filtering controller |
| CN205656227U (en) * | 2016-03-08 | 2016-10-19 | 武汉合康智能电气有限公司 | On -vehicle motor output current sampling circuit that fills |
Non-Patent Citations (2)
| Title |
|---|
| SANG-HOONKIM: "Chapter 5 - Vector control of alternating current motors", 《ELECTRIC MOTOR CONTROL》 * |
| 王刚: "直流电机伺服控制技术研究与实现", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206038885U (en) | Magnetic sensor integrated circuit , motor element and application apparatus | |
| CN103731077B (en) | The checkout gear of motor rotor position and rotating speed and method | |
| CN103954821B (en) | A kind of ripple voltage detection method of filter capacitor equivalent series resistance | |
| CN106931995B (en) | Four-phase rotating current circuit and method based on current output mode | |
| CN103018575A (en) | High-power inductance testing device, main circuit thereof and testing method thereof | |
| CN102230945A (en) | High-voltage isolation direct-current voltage acquisition circuit | |
| CN104617830A (en) | Counter electromotive force zero-cross detection method and method of brushless DC motor, and phase-changing signal output method and circuit | |
| CN206671826U (en) | Brshless DC motor AC signal real-time sampling system | |
| CN107039299B (en) | Metal-oxide-semiconductor parameter degradation circuit and metal-oxide-semiconductor parameter degradation early warning circuit | |
| CN103308780A (en) | Device and method for measuring total electric field intensity of ultra-high voltage direct current power transmission line | |
| CN114759852A (en) | High-frequency square wave driven rotary transformer decoding device and method | |
| CN110133360A (en) | Double AD channel AC electric machine phase current sample circuits | |
| CN101373695A (en) | Method and apparatus for observing and controlling digital ion trap | |
| CN204216805U (en) | Brushless DC motor without position sensor phase compensation device | |
| CN202189087U (en) | Device for detecting direct current components in alternating current | |
| CN103412184A (en) | Technology for monitoring and collecting original terminal currents of power equipment | |
| CN102576058A (en) | Performance-optimized actuation of a flux gate sensor | |
| CN106443524A (en) | Magnetic sensor integrated circuit, motor assembly and application device | |
| CN205986685U (en) | No sensor detection circuit | |
| CN108241129A (en) | Switching power supply output filter capacitor monitoring device and method | |
| CN201285409Y (en) | Phase voltage detection circuit | |
| CN106059427A (en) | Permanent magnet synchronous motor control method and system | |
| CN204681284U (en) | A kind of two-phase motor frequency-changing control system based on DSP | |
| CN211206614U (en) | Three-phase output current sampling circuit of motor controller of electric automobile | |
| CN106452221A (en) | Motor assembly and application device thereof, and sensor integrated circuit and signal processing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190816 |
|
| RJ01 | Rejection of invention patent application after publication |