CN102508016A - Voltage detection circuit of motor controller for electric vehicle - Google Patents
Voltage detection circuit of motor controller for electric vehicle Download PDFInfo
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- CN102508016A CN102508016A CN2011103358452A CN201110335845A CN102508016A CN 102508016 A CN102508016 A CN 102508016A CN 2011103358452 A CN2011103358452 A CN 2011103358452A CN 201110335845 A CN201110335845 A CN 201110335845A CN 102508016 A CN102508016 A CN 102508016A
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Abstract
The invention discloses a voltage detection circuit of a motor controller for an electric vehicle. The voltage detection circuit comprises a voltage input circuit, an input differential operation circuits, an analog opto-coupler isolation circuit, a voltage follower and a DSP (Digital Signal Processing) processor, wherein an output end of the voltage input circuit is connected with an input end of the input differential operation circuit, and an output end of the input differential operation circuit is connected with an input end of the analog opto-coupler isolation circuit; and an output end of the analog opto-coupler isolation circuit is connected with an input end of the voltage follower, and an output end of the voltage follower is connected with a detection port of the DSP. According to the voltage detection circuit, the cost is saved, simultaneously the voltage value of a power supply of the motor controller can be monitored in real time by hardware, and the supply voltage parameters of the controller can be supplied to a motor control system of a pure electric vehicle.
Description
Technical field
The invention belongs to motor in electric automobile and its design of Controller field, be specifically related to a kind of used for electric vehicle electric machine controller voltage detecting circuit.
Background technology
Pure electric vehicle is the popular domain of research and development at present, and the application of permagnetic synchronous motor in electric motor car is extensive day by day.In order to guarantee motor controller system operate as normal in certain power supply voltage range, must monitor the power supply magnitude of voltage of controller.Therefore adopt hardware circuit to carry out the collection of voltage signal.
Because general voltage collection circuit is influenced by neighbourhood noise; It is unstable voltage signal to occur; The signal errors of gathering is bigger, use the Hall voltage sensor to realize that the isolation of DC voltage and conversion also are common methods in addition, but the cost of the external high-performance voltage sensor device of producing is higher; And dosimetric sensors relatively is short of on performances such as conversion accuracy and electrical isolation, and price is not low yet.
As shown in Figure 1, simple voltage collection circuit is divided into two parts: 1. dividing potential drop current-limiting circuit and signal filter circuit.Input voltage is limited to magnitude of voltage in the input range of processor permission, through behind low-pass filter and the follower signal being input to main control chip through electric resistance partial pressure.
As shown in Figure 2, circuit adopts the chief component of Hall type voltage sensor as voltage collection circuit, is gathered voltage input pickup discrepancy end, and the analogue value that output terminal induces is handled through wave filter and follower again.
Though simple in structure in the foregoing circuit, be easy to realize that Fig. 1 is applicable to the situation line that neighbourhood noise is less; But under complex environment, use, receive the influence of external environment condition easily, scurry into interference; Magnitude of voltage that feasible collection is come out and actual value deviation are bigger, influence the stability of system.Though Fig. 2 has avoided the drawback of Fig. 1, the costing an arm and a leg of voltage sensor, volume is bigger, and control circuit PCB layout is limited, has improved the cost of manufacture of controller.
Summary of the invention
The object of the present invention is to provide a kind of used for electric vehicle electric machine controller voltage detecting circuit, make that the supply voltage testing result of controller system is more accurate, thereby guarantee the stable operation of electric system.
The following technical scheme of the concrete employing of the present invention.
A kind of used for electric vehicle electric machine controller voltage detecting circuit, said voltage detecting circuit comprise voltage input circuit, input difference computing circuit, simulation optical coupling isolation circuit, voltage follower and dsp processor, it is characterized in that:
The input end of said voltage input circuit is connected to motor in electric automobile controller power supply;
The output terminal of said voltage input circuit is connected to the input end of said input difference computing circuit, in proportion the voltage signal of voltage input circuit transmission is converted into the magnitude of voltage of 0-3V through the operational amplifier in the input difference computing circuit;
The output terminal of said input difference computing circuit is connected to the input end of said simulation optical coupling isolation circuit, and the voltage value signal of difference channel being exported 0-3V carries out electrical isolation;
The output terminal of said simulation optical coupling isolation circuit is connected to the positive input of voltage follower; The output terminal of said voltage follower links to each other with the input end of dsp processor; Motor in electric automobile controller power supply signal after handling is inputed to dsp processor, realize voltage detecting the used for electric vehicle electric machine controller.
Simulated light coupling mechanism and the amplifier composition that voltage collection circuit is mainly adopted high linearity provided by the invention.In measuring system, because environment is negative assorted, undesired signal can get into acquisition system along with acquired signal, is unfavorable for the accuracy of signal Processing and measurement.So in hardware, must make acquisition system and acquired signal realize effective electrical equipment isolation.Photoelectricity is isolated and can be avoided high pressure to scurry into the acquisition system of low pressure, and photoelectrical coupler input impedance is less than the internal resistance of interference source, thereby is superimposed on undesired signal in the measured signal by greatly decay, thereby guarantees the accuracy of acquired signal.
A kind of used for electric vehicle electric machine controller voltage detecting circuit provided by the invention is compared with existing voltage detecting circuit, and cost is low, makes that the supply voltage precision of gathering is higher, and the signal antijamming capability is stronger, guarantees that whole electric machine controller is reliable, safety.The present invention uses the linear optical coupling change-over circuit; Because linear optical coupling input end and output terminal are coupled through optocoupler; And the electrical isolation performance of chip itself is reliable; Therefore not only can realize the high Precision Detection of DC voltage, and can forceful electric power side electromagnetic interference (EMI) be coupled to control system, thus the high strength electrical isolation of realization DC voltage side and control system.
Description of drawings
Fig. 1 is electric resistance partial pressure type voltage signal acquisition circuit figure;
Fig. 2 is voltage sensor formula signal acquisition circuit figure;
Fig. 3 is a linear light lotus root HCNR201 simulating signal photoelectrical coupler synoptic diagram;
Fig. 4 is a circuit structure block diagram of the present invention;
Fig. 5 is circuit theory diagrams of the present invention.
Embodiment
Elaborate below in conjunction with accompanying drawing of the present invention.
Be illustrated in figure 4 as used for electric vehicle electric machine controller voltage detecting circuit theory diagram of the present invention,
The present invention has adopted the simulation optocoupler HCNR201 of high linearity, and the synoptic diagram of this chip is as shown in Figure 3.This chip is the simulating signal photoelectric isolating device, can realize the isolation between analog quantity and the digital quantity preferably, and output changes with input, and the linearity reaches 0.01%, and can avoid the internal-external circuit because of the different errors of bringing of ground connection.As shown in Figure 3; This chip comprises a high performance aluminum gallium arsenide light emitting diode (LED among Fig. 3); PD1; PD2 is the photodiode of two adjacent couplings, and this encapsulating structure has determined the illumination that each photodiode can both obtain being similar to from LED, thereby eliminated the error that the non-linear and bias property of LED is brought.When electric current flow through LED, the light that LED sends was coupled to PD1, PD2, thus produce the output current be directly proportional with light intensity at device output end.In LED, flow through electric current I
FThe time, the light that LED sends can induce the photocurrent I that is proportional to the LED luminous intensity in PD1 and PD2
PD1And I
PD2Because the characteristic of PD1 and PD2 is closely similar, add the advanced package design of installation site accuracy and element and guaranteed the high linearity of this element and the stability of gain, make
I
PD1=K1I
F,?I
PD2=K2I
F （1）
K wherein
1, K
2Be respectively I
PD1And I
PD2With I
FRunning parameter, for HCNR201, it be consistent that its parameter changes.So following formula can be converted into
（2）
The ratio that K3 equals K1 and K2 is approximately 1.
Fig. 4 has provided the theory diagram of the voltage detecting circuit of the present invention's employing, mainly by voltage input circuit, and the input difference computing circuit, the simulation optical coupling isolation circuit, and the output voltage follow circuit is formed.The voltage input difference circuit input difference circuit that the power supply voltage signal that will detect during voltage input circuit carries out exporting to after the Filtering Processing back level is converted into the input voltage value of power supply through operational amplifier the magnitude of voltage of 0-3V in proportion; Because the input voltage range of the AD passage of DSP must satisfy 0-3V; Overtension can cause the damage of AD pin, then this voltage is input to the simulation optical coupling isolation circuit.
Simulation optical coupling isolation circuit: be with the difference channel output voltage values electrical isolation of prime and the linear back one-level voltage follower circuit that is transferred to.
Voltage follower: this voltage signal is input to the positive input of voltage follower.Voltage follower can play the effect of impedance matching in circuit, can make the amplifying circuit of back one-level better work, and output voltage does not receive back level impedance influences again.
Fig. 5 is circuit theory diagrams of the present invention.
This circuit is made up of four parts:
Wherein said voltage input circuit comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, first capacitor C 1; Wherein an end of first resistance R 1 connects the earth terminal of motor in electric automobile controller power supply, and the other end of said first resistance R 1 is connected to the inverting input of first operational amplifier in the input difference computing circuit; One end of said second resistance R 2 is connected to the positive ends of motor in electric automobile controller power supply, and the other end of second resistance R 2 is connected to the normal phase input end of first operational amplifier in the input difference computing circuit; Said the 3rd resistance R 3 and first capacitor C 1 are connected in parallel between the normal phase input end and ground of first operational amplifier in the said input difference computing circuit.
Wherein said input difference computing circuit comprises first operational amplifier (U1), the 4th resistance R 4, second capacitor C 2, and said the 4th resistance R 4 and second capacitor C 2 are connected in parallel between the inverting input and output terminal of said first operational amplifier (U1); The other end of said voltage input circuit first resistance R 1 is connected to the inverting input of first operational amplifier in the input difference computing circuit; One end of said second resistance R 2 is connected to the positive ends of motor in electric automobile controller power supply, and the other end of second resistance R 2 is connected to the normal phase input end of first operational amplifier in the input difference computing circuit;
Wherein said simulation optical coupling isolation circuit comprises: linear optical coupling HCR201, the second operational amplifier U2, the 3rd computing discharger U3, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 3rd capacitor C 3, the 5th capacitor C 5.One end of the 5th resistance R 5 is connected to the output terminal of the first amplifier U1, and the other end is connected to the PD1-end of HCR201 and the reverse input end of the second amplifier U2; The positive terminal of the U2 of second amplifier is connected to ground level.The 3rd capacitor C 3 one ends are connected to the backward end of the second electric capacity U2, and the other end is connected to the 6th resistance R 6, and the other end of R6 is connected to the LED-pin of HCNR201.The output pin PD2-of HCNR201 connects the reverse input end of the 3rd amplifier U3, and the parallelly connected back one with the 7th resistance R 7 of the 5th capacitor C 5 terminates at the backward end of the 3rd amplifier U3, and an end is connected the output terminal of amplifier.
Wherein said voltage follower circuit comprises four-operational amplifier U4, the 8th resistance R 8 and the 9th resistance R 9; One end of the 8th resistance R 8 is connected the output terminal of the 3rd amplifier U3; One end is connected the positive terminal of four high guaily unit; The backward end of four high guaily unit U4 links to each other with output terminal, and an end of the 9th resistance is connected the output terminal of four high guaily unit U4, and the other end is connected to signal receiving end.
The first amplifier U1 and peripheral resistance constitute voltage input circuit and difference ratio computing circuit; The second amplifier U2 and the 3rd amplifier U3 and linear optical coupling HCNR201 constitute the simulation optical coupling isolation circuit; Four high guaily unit U4 and the 9th resistance R 9, the eight resistance R 8 constitute the voltage follower output loop.The output terminal of voltage input circuit is connected with the input end of input difference computing circuit; The output terminal of input difference computing circuit links to each other with the input end of simulation optical coupling isolation circuit, and the output terminal of your optical coupling isolation circuit of mould is connected with the input end of voltage follower; The output terminal of voltage follower is connected with the detection port of DSP.The signal of this circuit realizes that principle is: for improving the accuracy of measuring, so the mode that circuit is just imported with difference.The difference channel enlargement factor computing formula that the first amplifier amplifier U1 constitutes is:
In following formula, if choose the relation of R8/R5=R7/R6, then output voltage is reduced to:
The 3rd capacitor C 3 plays retroactive effect among Fig. 5; Burr signal in the simultaneity factor dividing circuit; Avoid the aluminum gallium arsenide light emitting diode of HCN201 to receive impact in addition, the 6th resistance R 6 can be controlled the luminous intensity of LED, thereby gain is played a role to control channel.
If the backward end voltage of the second amplifier U2 is Vi, the amplifier output terminal is V
Out2, both satisfy relation of plane down under the undersaturated situation of amplifier:
V
out2=?V
out20-GVi (5)
V wherein
Out20Be to be 0 o'clock output voltage at amplifier input differential mode voltage, G is the gain of amplifier, and is general bigger.
The input current (empty disconnected) of ignoring the amplifier backward end can think that the electric current through R5 is I
PD1, can obtain:
(6)
Electric current through the R6 two ends is IF, gets according to Ohm law:
Characteristic K1=I according to optocoupler
PD1/ I
F, formula (6) and (7) substitution can be got:
(8) can get after the distortion:
（9）
Formula (9) substitution formula (7) is got:
Because G is big especially, then can do following approximate:
Then output is following with the relation of input voltage:
Can be got by following formula, in this circuit, export and be entered as direct ratio, and scale-up factor is by K3 and R5, R7 confirms.
According to HCNR201 parameter, I
FThe value maximum can not surpass 40mA, so the value of R6 can not be less than VCC/40mA, when VCC=5V, the R6 value should be greater than 125 Ω.
Claims (5)
1. used for electric vehicle electric machine controller voltage detecting circuit, said voltage detecting circuit comprise voltage input circuit, input difference computing circuit, simulation optical coupling isolation circuit, voltage follower and dsp processor, it is characterized in that:
The input end of said voltage input circuit is connected to motor in electric automobile controller power supply;
The output terminal of said voltage input circuit is connected to the input end of said input difference computing circuit, in proportion the voltage signal of voltage input circuit transmission is converted into the magnitude of voltage of 0-3V through the operational amplifier in the input difference computing circuit;
The output terminal of said input difference computing circuit is connected to the input end of said simulation optical coupling isolation circuit, and the voltage value signal of difference channel being exported 0-3V carries out electrical isolation;
The output terminal of said simulation optical coupling isolation circuit is connected to the positive input of voltage follower; The output terminal of said voltage follower links to each other with the input end of dsp processor; Motor in electric automobile controller power supply signal after handling is inputed to dsp processor, realize voltage detecting the used for electric vehicle electric machine controller.
2. according to the described used for electric vehicle electric machine controller of claim 1 voltage detecting circuit, it is characterized in that:
Wherein said voltage input circuit comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, first capacitor C 1; Wherein an end of first resistance R 1 connects the earth terminal of motor in electric automobile controller power supply, and the other end of said first resistance R 1 is connected to the inverting input of first operational amplifier in the input difference computing circuit; One end of said second resistance R 2 is connected to the positive ends of motor in electric automobile controller power supply, and the other end of second resistance R 2 is connected to the normal phase input end of first operational amplifier in the input difference computing circuit; Said the 3rd resistance R 3 and first capacitor C 1 are connected in parallel between the normal phase input end and ground of first operational amplifier in the said input difference computing circuit.
3. used for electric vehicle electric machine controller voltage detecting circuit according to claim 1 and 2 is characterized in that:
Wherein said input difference computing circuit comprises the first operational amplifier U1, the 4th resistance R 4, second capacitor C 2, and said the 4th resistance R 4 and second capacitor C 2 are connected in parallel between the inverting input and output terminal of the said first operational amplifier U1; The other end of said voltage input circuit first resistance R 1 is connected to the inverting input of first operational amplifier in the input difference computing circuit; One end of said second resistance R 2 is connected to the positive ends of motor in electric automobile controller power supply, and the other end of second resistance R 2 is connected to the normal phase input end of first operational amplifier in the input difference computing circuit.
4. used for electric vehicle electric machine controller voltage detecting circuit according to claim 1 is characterized in that:
Wherein said simulation optical coupling isolation circuit comprises: linear optical coupling HCR201, the second operational amplifier U2, the 3rd computing discharger U3, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 3rd capacitor C 3, the 5th capacitor C 5;
One end of the 5th resistance R 5 is connected to the output terminal of the first amplifier U1, and the other end is connected to the PD1-end of HCR201 and the reverse input end of the second amplifier U2; The positive terminal of the U2 of second amplifier is connected to ground level;
The 3rd capacitor C 3 one ends are connected to the backward end of the second electric capacity U2, and the other end is connected to the 6th resistance R 6, and the other end of R6 is connected to the LED-pin of HCNR201;
The output pin PD2-of HCNR201 connects the reverse input end of the 3rd amplifier U3, and the parallelly connected back one with the 7th resistance R 7 of the 5th capacitor C 5 terminates at the backward end of the 3rd amplifier U3, and an end is connected the output terminal of amplifier.
5. used for electric vehicle electric machine controller voltage detecting circuit according to claim 1 is characterized in that:
Wherein said voltage follower circuit comprises four-operational amplifier U4, the 8th resistance R 8 and the 9th resistance R 9; One end of the 8th resistance R 8 is connected the output terminal of the 3rd amplifier U3; One end is connected the positive terminal of four high guaily unit; The backward end of four high guaily unit U4 links to each other with output terminal, and an end of the 9th resistance is connected the output terminal of four high guaily unit U4, and the other end is connected to signal receiving end.
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| CN2011103358452A CN102508016A (en) | 2011-10-31 | 2011-10-31 | Voltage detection circuit of motor controller for electric vehicle |
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Cited By (12)
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| CN102998502A (en) * | 2012-12-06 | 2013-03-27 | 陈实 | High-isolation voltage-resisting bidirectional signal sensor |
| CN103412555A (en) * | 2013-07-01 | 2013-11-27 | 奇瑞汽车股份有限公司 | Fault diagnosis method of electric vehicle controller chip |
| CN103575954A (en) * | 2012-07-23 | 2014-02-12 | 上海粱江通信系统股份有限公司 | Power source monitoring system |
| CN103633992A (en) * | 2013-11-20 | 2014-03-12 | 中国船舶重工集团公司第七一六研究所 | Alternating current-direct current analog signal effective value conversion and linear optical wide-temperature conditioning circuit |
| CN103675411A (en) * | 2013-12-30 | 2014-03-26 | 安徽江淮汽车股份有限公司 | Voltage detection method and voltage detection system of motor controller for electric vehicle |
| CN103809003A (en) * | 2014-01-20 | 2014-05-21 | 河南科技大学 | Isolator for testing signal voltage waveforms |
| CN106483348A (en) * | 2016-12-19 | 2017-03-08 | 珠海格力电器股份有限公司 | A kind of ripple detection circuit |
| CN106645905A (en) * | 2016-11-11 | 2017-05-10 | 大禹电气科技股份有限公司 | Output voltage isolation sampling circuit of high-voltage inverter |
| CN110824220A (en) * | 2019-11-05 | 2020-02-21 | 上海置信电气股份有限公司 | Novel signal acquisition circuit of electronic sensor |
| CN111487546A (en) * | 2020-04-23 | 2020-08-04 | 重庆长安汽车股份有限公司 | Electromagnetic interference simulation test system and method |
| CN112671354A (en) * | 2020-12-23 | 2021-04-16 | 南方电网电力科技股份有限公司 | Novel broadband high-voltage cascade linear amplifier device |
| CN113702832A (en) * | 2021-10-29 | 2021-11-26 | 深圳市东鼎丰电子有限公司 | Micro motor test board card and micro motor tester |
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Cited By (17)
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| CN103575954A (en) * | 2012-07-23 | 2014-02-12 | 上海粱江通信系统股份有限公司 | Power source monitoring system |
| CN103575954B (en) * | 2012-07-23 | 2016-08-03 | 上海粱江通信系统股份有限公司 | A kind of power supply monitoring system |
| CN102998502A (en) * | 2012-12-06 | 2013-03-27 | 陈实 | High-isolation voltage-resisting bidirectional signal sensor |
| CN102998502B (en) * | 2012-12-06 | 2015-03-04 | 陈实 | High-isolation voltage-resisting bidirectional signal sensor |
| CN103412555A (en) * | 2013-07-01 | 2013-11-27 | 奇瑞汽车股份有限公司 | Fault diagnosis method of electric vehicle controller chip |
| CN103412555B (en) * | 2013-07-01 | 2016-01-06 | 奇瑞新能源汽车技术有限公司 | A kind of method for diagnosing faults of electric vehicle controller chip |
| CN103633992B (en) * | 2013-11-20 | 2016-03-30 | 中国船舶重工集团公司第七一六研究所 | The RMS-DC converter of alternating current-direct current analog signal and linear optical isolation wide-temperature modulate circuit |
| CN103633992A (en) * | 2013-11-20 | 2014-03-12 | 中国船舶重工集团公司第七一六研究所 | Alternating current-direct current analog signal effective value conversion and linear optical wide-temperature conditioning circuit |
| CN103675411A (en) * | 2013-12-30 | 2014-03-26 | 安徽江淮汽车股份有限公司 | Voltage detection method and voltage detection system of motor controller for electric vehicle |
| CN103809003A (en) * | 2014-01-20 | 2014-05-21 | 河南科技大学 | Isolator for testing signal voltage waveforms |
| CN106645905A (en) * | 2016-11-11 | 2017-05-10 | 大禹电气科技股份有限公司 | Output voltage isolation sampling circuit of high-voltage inverter |
| CN106483348A (en) * | 2016-12-19 | 2017-03-08 | 珠海格力电器股份有限公司 | A kind of ripple detection circuit |
| CN110824220A (en) * | 2019-11-05 | 2020-02-21 | 上海置信电气股份有限公司 | Novel signal acquisition circuit of electronic sensor |
| CN111487546A (en) * | 2020-04-23 | 2020-08-04 | 重庆长安汽车股份有限公司 | Electromagnetic interference simulation test system and method |
| CN111487546B (en) * | 2020-04-23 | 2022-09-06 | 重庆长安汽车股份有限公司 | Electromagnetic interference simulation test system and method |
| CN112671354A (en) * | 2020-12-23 | 2021-04-16 | 南方电网电力科技股份有限公司 | Novel broadband high-voltage cascade linear amplifier device |
| CN113702832A (en) * | 2021-10-29 | 2021-11-26 | 深圳市东鼎丰电子有限公司 | Micro motor test board card and micro motor tester |
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Application publication date: 20120620 |