CN204086386U - A kind of electric automobile direct-current high-voltage sensor - Google Patents
A kind of electric automobile direct-current high-voltage sensor Download PDFInfo
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- CN204086386U CN204086386U CN201420575144.5U CN201420575144U CN204086386U CN 204086386 U CN204086386 U CN 204086386U CN 201420575144 U CN201420575144 U CN 201420575144U CN 204086386 U CN204086386 U CN 204086386U
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Abstract
The utility model provides a kind of electric automobile direct-current high-voltage sensor, comprise the high pressure resistor voltage divider network be connected between power battery pack both positive and negative polarity, also comprise subtraction circuit, ADC converter, magnetoelectricity signal isolating converter, microprocessor, DAC converter and voltage follower, the output terminal of described high pressure resistor voltage divider network is connected by the input end of subtraction circuit with ADC converter, described ADC converter is connected with microprocessor interactive signal by magnetoelectricity signal isolating converter, the output terminal of described microprocessor is connected with the input end of voltage follower by DAC converter.The utility model has the advantages such as circuit structure is simple and reliable, with low cost, sampling precision is high.
Description
Technical field
The utility model relates to Control of Electric Vehicles technical field, specifically a kind of electric automobile direct-current high-voltage sensor.
Background technology
The fast development of electric automobile brings the widespread use of electrokinetic cell, in order to ensure the safe operation of electrokinetic cell, need to detect its various parameter such as temperature, voltage, electric current, SOC etc. or monitor, wherein, the voltage of electrokinetic cell is a very important parameter, control system needs to detect current busbar voltage change, makes various action or adjustment parameter in good time.
Fig. 1 gives a kind of example of existing power battery pack total voltage detection circuit, high resistance R1, resistance R2 and resistance R3 is connected with between the plus end and negative terminal of power battery pack, resistance R1, resistance R2 and resistance R3 is utilized to carry out dividing potential drop to the total voltage of power battery pack, recycling difference instrument amplifier U1 and isolation amplifier U2, generate the sampled voltage of isolation, sample for rear end ADC sample circuit.
Scheme shown in Fig. 1, need to adopt difference instrument amplifier and isolation amplifier that voltage signal is transferred to rear end sampled point, the cost of difference instrument amplifier and isolation amplifier is higher, and needs multichannel positive-negative power to power to isolation amplifier.In addition, in order to be divided to the voltage that ADC sample circuit can measure, high resistance must be utilized to increase intrinsic standoff ratio, in this situation, the electric current flowed in total voltage detection terminal is less, in order to ensure the reliability of total voltage detection terminal contact, needs the connection terminal using high cost; And because partial pressure value is lower, and check point is closely held, the Earth noise that in high-tension line, working current causes is comparatively large, even if adopt high-precision amplifying, Earth noise is also exaggerated thereupon, and Detection results is poor.
Fig. 2 gives the another kind of example of existing power battery pack total voltage detection circuit, the program needs to give constant potential at the second resistance R2 of described circuit and the tie point of the 3rd resistance R3, then gathers intermediate point constant voltage, the output voltage of differential amplifier circuit, the voltage between the first resistance R1 and the second resistance R2, the voltage between the 3rd resistance R3 and the 4th resistance R4 respectively by a microprocessor.
Scheme shown in Fig. 2, multiple ADC acquisition channel is not only needed to carry out voltage detecting, and need Microprocessor S3C44B0X detector switch K1, K2 to be switched on or switched off, when detector switch is connected, high-tension circuit and testing circuit being connected, making high-tension circuit by forming loop between interlaminated resistance network and ground, because the ground of testing circuit is connected with vehicle frame, to the insulativity of car load be affected, thus reduce vehicle security.
Utility model content
The purpose of this utility model is to provide that a kind of structure is simple, dependable performance, the electric automobile direct-current high-voltage sensor that with low cost, sampling precision is high.
The technical solution of the utility model is:
A kind of electric automobile direct-current high-voltage sensor, comprise the high pressure resistor voltage divider network be connected between power battery pack both positive and negative polarity, also comprise subtraction circuit, ADC converter, magnetoelectricity signal isolating converter, microprocessor, DAC converter and voltage follower, the output terminal of described high pressure resistor voltage divider network is connected by the input end of subtraction circuit with ADC converter, described ADC converter is connected with microprocessor interactive signal by magnetoelectricity signal isolating converter, and the output terminal of described microprocessor is connected with the input end of voltage follower by DAC converter;
Described high pressure resistor voltage divider network is connected in series by the resistance that odd number resistance is identical and forms, described subtraction circuit is attempted by the interlaminated resistance two ends of high pressure resistor voltage divider network, the voltage be carried on interlaminated resistance is sampled, and by scaled for sampled voltage rear input ADC converter.
Described electric automobile direct-current high-voltage sensor, described subtraction circuit comprises proportion operational amplifier chip, the inverting input of described proportion operational amplifier chip connects the current input terminal of interlaminated resistance by the first resistance, its in-phase input end connects the current output terminal of interlaminated resistance by the second resistance, its output terminal passes through the 3rd resistance and the 4th resistance eutral grounding of serial connection, and described 3rd resistance is connected the input end of ADC converter with the node between the 4th resistance;
The inverting input of described proportion operational amplifier chip and the node between the first resistance are connected the node between the output terminal of proportion operational amplifier chip and the 3rd resistance by the 5th resistance; Node between the in-phase input end of described proportion operational amplifier chip and the second resistance is by the 6th resistance eutral grounding; Described first resistance has identical resistance with the second resistance, and described 5th resistance has identical resistance with the 6th resistance, and the resistance of described first resistance is greater than the resistance of the 5th resistance.
Described electric automobile direct-current high-voltage sensor, also comprises CAN communication interface, and described CAN communication interface is connected with microprocessor interactive signal.
Described electric automobile direct-current high-voltage sensor, also comprises insulating power supply, and described insulating power supply is subtraction circuit, ADC converter and magnetoelectricity signal isolating converter provide working power.
Described electric automobile direct-current high-voltage sensor, the two ends of described 4th resistance, the 5th resistance and the 6th resistance all and be connected to filter capacitor.
Described electric automobile direct-current high-voltage sensor, the resistance of described first resistance is the integral multiple of the resistance of the 5th resistance.
As shown from the above technical solution, the utility model adopts the mode of interlaminated resistance dividing potential drop, obtain the portion voltage of DC bus-bar voltage, again by after this voltage scale down, by ADC converter, this voltage transitions is become digital voltage signal, and isolated by magnetoelectricity signal isolating converter, ensure the safety of low-pressure section circuit; The digital voltage signal collected is reduced by its inside or outside DAC converter by microprocessor in proportion, and obtain the DC voltage of variation range between 0 ~ 5V, this magnitude of voltage reflects the change of current busbar voltage.The utility model is compared with prior art, eliminate multi-channel A/D C collecting unit and expensive isolation amplifier, adopt an extremely simple discharge circuit can realize the acquisition of sampled voltage, avoid the interference of Earth noise to sampled signal, and sampling is completely isolated with control circuit, the insulating property of car load can not be affected, there is the advantages such as circuit structure is simple and reliable, with low cost, sampling precision is high.
Accompanying drawing explanation
Fig. 1 is existing scheme dividing potential drop detection schematic diagram over the ground;
Fig. 2 is that in the middle of existing scheme, multichannel dividing potential drop detects schematic diagram;
Fig. 3 is the structural representation of the utility model specific embodiment;
Fig. 4 is voltage acquisition of the present utility model and signal condition schematic diagram;
Fig. 5 is signal of the present utility model conversion and transmission schematic diagram.
Embodiment
The utility model is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 3, a kind of electric automobile direct-current high-voltage sensor, comprises high pressure resistor voltage divider network 1, subtraction circuit 2, ADC converter 3, magnetoelectricity signal isolating converter 4, microprocessor 5, DAC converter 6, voltage follower 7, CAN communication interface 8 and insulating power supply 9.The output terminal of high pressure resistor voltage divider network 1 connects the input end of subtraction circuit 2, the output terminal of subtraction circuit 2 connects the input end of ADC converter 3, ADC converter 3 is connected with magnetoelectricity signal isolating converter 4 interactive signal, magnetoelectricity signal isolating converter 4 is connected with microprocessor 5 interactive signal, the output terminal of microprocessor 5 is connected with the input end of DAC converter 6, the output terminal of DAC converter 6 is connected with the input end of voltage follower 7, and microprocessor 5 is connected with CAN communication interface 8 interactive signal; Insulating power supply 9 is subtraction circuit 2, ADC converter 3 and magnetoelectricity signal isolating converter 4 provide working power.
As shown in Figure 4, high pressure resistor voltage divider network 1 is in series by five resistances identical resistance R1, R2, R3, R4 and R5, be connected between the positive pole of power battery pack BT and negative pole, resistance R3 is the interlaminated resistance of high pressure resistor voltage divider network 1, because the resistance of each resistance is identical, each ohmically dividing potential drop is identical, is connected with a sample circuit be made up of subtraction circuit 2 at the two ends of resistance R3.Subtraction circuit 2 comprises proportion operational amplifier chip U1, the in-phase input end of proportion operational amplifier chip U1 is connected to the current output terminal of resistance R3 by resistance R7, its inverting input is connected to the current input terminal of resistance R3 by resistance R6, its output terminal passes through resistance R10 and the R11 ground connection of serial connection, node between the in-phase input end of resistance R7 and proportion operational amplifier chip U1 passes through and the resistance R9 connect and electric capacity C1 ground connection, node between resistance R6 and the inverting input of proportion operational amplifier chip U1 passes through and the resistance R8 connect and electric capacity C2 is connected node between the output terminal of proportion operational amplifier chip U1 and resistance R10, resistance R11 two ends are also connected to electric capacity C3, node between resistance R10 and resistance R11 is connected to the input end of ADC converter 3.
In this circuit, resistance R6 is identical with resistance R7 resistance, resistance R8 is identical with resistance R9 resistance, and the resistance of resistance R6 is greater than the resistance of resistance R8, in the present embodiment, for providing measuring accuracy, suppose that the resistance of resistance R6 is the integral multiple of the resistance of resistance R8, now, at the two ends of resistance R3, relative to the ground end of high pressure, two voltages V1, V2 can be formed, after proportion operational amplifier chip U1, its output voltage Vo is the product of the difference of V1, V2 and the enlargement factor of proportion operational amplifier chip U1, that is:
Vo＝(V1-V2)*(R8/R6)
The output voltage Vo of proportion operational amplifier chip U1 carries out dividing potential drop through resistance R10 and R11, the voltage Vdc on resistance R11, reduces by the resistance multiple proportion between resistance R8 and resistance R6.The enlargement factor of Reasonable adjustment subtraction circuit 2, makes the variation range of output voltage Vdc between 0 ~ 5V.
As shown in Figure 5, ADC converter 3 is ADC converters of the 12Bit of a band SPI interface, and its SPI interface is connected with microprocessor 5 by magnetoelectricity signal isolating converter 4.Magnetoelectricity signal isolating converter 4 mainly plays the effect of electrical isolation here, and the digital signal level between ADC converter 3 and microprocessor 5 is converted to field signal to realize information transmission by it.The working power of magnetoelectricity signal isolating converter 4 high-pressure side, ADC converter 3 and subtraction circuit 2 is provided by insulating power supply 9.The utilization of insulating power supply 9 and magnetoelectricity signal isolating converter 4, makes high-pressure system and low voltage control end mutually isolated on electrically, has ensured the Signal transmissions between high pressure sampling and information processing.
Microprocessor 5 reads the digital voltage signal of ADC converter 3 output by its SP work interface, the digital voltage signal received is converted to a same analog voltage signal changed with it by the DAC converter 6 again by being attached thereto, and this analog voltage signal gives late-class circuit by voltage follower 7.In the vehicle environmental possessing CAN communication network, can increase CAN communication interface 8, the digital voltage signal that microprocessor 8 is received sends to other Controlling vertex on vehicle by CAN network, realizes information sharing.
The above embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that claims of the present utility model determine.
Claims (6)
1. an electric automobile direct-current high-voltage sensor, comprise the high pressure resistor voltage divider network be connected between power battery pack both positive and negative polarity, it is characterized in that: also comprise subtraction circuit, ADC converter, magnetoelectricity signal isolating converter, microprocessor, DAC converter and voltage follower, the output terminal of described high pressure resistor voltage divider network is connected by the input end of subtraction circuit with ADC converter, described ADC converter is connected with microprocessor interactive signal by magnetoelectricity signal isolating converter, the output terminal of described microprocessor is connected with the input end of voltage follower by DAC converter,
Described high pressure resistor voltage divider network is connected in series by the resistance that odd number resistance is identical and forms, described subtraction circuit is attempted by the interlaminated resistance two ends of high pressure resistor voltage divider network, the voltage be carried on interlaminated resistance is sampled, and by scaled for sampled voltage rear input ADC converter.
2. electric automobile direct-current high-voltage sensor according to claim 1, it is characterized in that: described subtraction circuit comprises proportion operational amplifier chip, the inverting input of described proportion operational amplifier chip connects the current input terminal of interlaminated resistance by the first resistance, its in-phase input end connects the current output terminal of interlaminated resistance by the second resistance, its output terminal passes through the 3rd resistance and the 4th resistance eutral grounding of serial connection, and described 3rd resistance is connected the input end of ADC converter with the node between the 4th resistance;
The inverting input of described proportion operational amplifier chip and the node between the first resistance are connected the node between the output terminal of proportion operational amplifier chip and the 3rd resistance by the 5th resistance; Node between the in-phase input end of described proportion operational amplifier chip and the second resistance is by the 6th resistance eutral grounding; Described first resistance has identical resistance with the second resistance, and described 5th resistance has identical resistance with the 6th resistance, and the resistance of described first resistance is greater than the resistance of the 5th resistance.
3. electric automobile direct-current high-voltage sensor according to claim 1, is characterized in that: also comprise CAN communication interface, described CAN communication interface is connected with microprocessor interactive signal.
4. electric automobile direct-current high-voltage sensor according to claim 1, is characterized in that: also comprise insulating power supply, and described insulating power supply is subtraction circuit, ADC converter and magnetoelectricity signal isolating converter provide working power.
5. electric automobile direct-current high-voltage sensor according to claim 2, is characterized in that: the two ends of described 4th resistance, the 5th resistance and the 6th resistance all and be connected to filter capacitor.
6. electric automobile direct-current high-voltage sensor according to claim 2, is characterized in that: the resistance of described first resistance is the integral multiple of the resistance of the 5th resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420575144.5U CN204086386U (en) | 2014-10-08 | 2014-10-08 | A kind of electric automobile direct-current high-voltage sensor |
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| CN201420575144.5U CN204086386U (en) | 2014-10-08 | 2014-10-08 | A kind of electric automobile direct-current high-voltage sensor |
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| CN204086386U true CN204086386U (en) | 2015-01-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237624A (en) * | 2014-10-08 | 2014-12-24 | 武汉弈飞科技有限公司 | EV (electric vehicle) direct-current high-voltage sensor and sampling method thereof |
| CN107037255A (en) * | 2016-11-28 | 2017-08-11 | 珠海格力电器股份有限公司 | A kind of ripple voltage detects circuit |
-
2014
- 2014-10-08 CN CN201420575144.5U patent/CN204086386U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237624A (en) * | 2014-10-08 | 2014-12-24 | 武汉弈飞科技有限公司 | EV (electric vehicle) direct-current high-voltage sensor and sampling method thereof |
| CN104237624B (en) * | 2014-10-08 | 2017-04-12 | 武汉弈飞科技有限公司 | EV (electric vehicle) direct-current high-voltage sensor and sampling method thereof |
| CN107037255A (en) * | 2016-11-28 | 2017-08-11 | 珠海格力电器股份有限公司 | A kind of ripple voltage detects circuit |
| CN107037255B (en) * | 2016-11-28 | 2023-12-22 | 珠海格力电器股份有限公司 | Voltage ripple detection circuit |
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Effective date of registration: 20160531 Address after: 518110, Guangdong, Shenzhen province Longhua New District Guanlan street, Fu hang community, 3-1 A building, two, affluent Industrial Zone Patentee after: Shenzhen semitool Technology Co. Ltd. Address before: 430000 Hubei city of Wuhan Province, East Lake New Technology Development Zone Road, a central software research building D building 4 layer Patentee before: WUHAN YIFEI SCIENCE & TECHNOLOGY CO., LTD. |
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| CU03 | Correction of utility model patent gazette |
Correction item: Patentee|Address Correct: Shenzhen Saimai Technology Co., Ltd.|518110, Guangdong, Shenzhen province Longhua New District Guanlan street, Fu hang community, 3-1 A building, two, affluent Industrial Zone False: Shenzhen semitool Technology Co. Ltd.|518110, Guangdong, Shenzhen province Longhua New District Guanlan street, Fu hang community, 3-1 A building, two, affluent Industrial Zone Number: 25 Volume: 32 |
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Addressee: Shenzhen Saimai Technology Co., Ltd. Document name: Notification of Passing Examination on Formalities |
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| DD01 | Delivery of document by public notice |
Addressee: Shenzhen Saimai Technology Co., Ltd. Document name: Notification of Passing Examination on Formalities |
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| DD01 | Delivery of document by public notice |