CN202134943U - Low-voltage protection measurement and control unit used for electric automobile AC charging post - Google Patents
Low-voltage protection measurement and control unit used for electric automobile AC charging post Download PDFInfo
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- CN202134943U CN202134943U CN201120268479U CN201120268479U CN202134943U CN 202134943 U CN202134943 U CN 202134943U CN 201120268479 U CN201120268479 U CN 201120268479U CN 201120268479 U CN201120268479 U CN 201120268479U CN 202134943 U CN202134943 U CN 202134943U
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Abstract
The utility model discloses a low-voltage protection measurement and control unit used for an electric automobile AC (Alternating Current) charging post, comprising: an analog input module used for accessing voltage and current signals; a relay output module used for control of an AC contactor in the charging post and control of an electromagnetic lock and a lamp box; a power supply module used for providing voltages such as DC (Direct Current) 24V, + or - 12V, 5V, and so on required by an inner part of the low-voltage protection measurement and control unit; a CPU (Central Processing Unit) module used for calculating the analog, acquiring digital signals, protecting logical operations, charging control and other auxiliary functions; and a digital signal input module used for acquiring state signals of the AC contactor, an air switch, the electromagnetic lock and an emergency stop button. The low-voltage protection measurement and control unit of the utility model is completely suitable for protection control needs of the electric automobile AC charging post, and can ensure reliability and safety of the charging.
Description
Technical field
The utility model relates to a kind of low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile, belongs to technical field of electrical automatic control.
Background technology
Present global auto industry is to crack the restriction of the energy, environment, realizes sustainable development, all in the transition of making great efforts to explore and promote transportation and energy's dynamical system with positive posture more.In the face of the pressure of high-order concussion of international oil price and global warming energy-saving and emission-reduction, the development electric automobile has been obtained the height common recognition of international community as realizing transportation and energy's technology path of transition in recent years.The charging electric vehicle Facilities Construction meanwhile also rises to the necessary condition of ev industry development, and infrastructure construction will be played an important role in the electric automobile on the horizon epoch.
As the part of charging infrastructure, alternating-current charging pile is that a kind of special charging interface that utilizes is the AC power supply device that electric automobile with vehicle-mounted charge machine provides AC energy.Applicable cases to alternating-current charging pile; Also need a kind of low-voltage variation measure and control device; Realize functions such as protection, observing and controlling, metering, communication, can charge through dedicated human interface control, and can excise the various faults in the charging process timely; And various misoperation operating modes are reported to the police, cooperate the energy meter charge system to carry out functions such as charging accounting, energy management simultaneously.
Existing conventional low pressure protective relaying device is is all designed and developed to the electric power system application characteristic; It can't satisfy the application demand of electric vehicle alternating-current charging pile; Therefore need to develop a novel low-voltage variation measurement and control unit again, satisfy the fail safe and the reliability requirement of charging to the characteristic of charging pile.
The utility model content
The purpose of the utility model is: the application demand to electric vehicle alternating-current charging pile, a kind of low-voltage variation measurement and control unit that is used for charging pile is proposed, and satisfy metering, protection, communication and the controlled function of charging pile.
For solving the problems of the technologies described above; The utility model provides a kind of low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile; Comprise the analog quantity input module, be used to insert voltage, current signal, and convert voltage, current signal to small-signal access AD converter; It is characterized in that: also comprise
Relay output module: be used for the control of A.C. contactor and controlling of electromagnetic lock and lamp box in the charging pile;
Power module: be used to provide the inner required direct current 24V of low-voltage variation measurement and control unit, ± 12V, 5V voltage etc.;
The CPU module is used for calculating analog quantity, collection digital signal, protection logical operation, charging control and other miscellaneous functions etc.;
Digital signal input module: the status signal that is used to gather parts such as A.C. contactor, air switch, electromagnetic lock, scram button.
The aforesaid low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile is characterized in that: also comprise casing, said casing is the ABS plastic housing.
Further; Said analog quantity input module comprises voltage input circuit and two parts of current input circuit; The voltage signal of said voltage input circuit comprises three-phase voltage (Ua, Ub, Uc), and voltage signal inserts AD converter again behind low-pass filter circuit behind the one-level operational amplifier; Cable core-theaded type CT is adopted in the current signal input of said current input circuit; Comprise three-phase current (Ia, Ib, Ic) and leakage current (Ir); The current signal of current input circuit inserts AD converter respectively after through the amplifier of two-stage different gains; Two-stage signal is all carried out the Fu Shi computing and is calculated amplitude after the AD converter conversion, select wherein one-level participation logical operation according to range of signal automatically by CPU.
Further; Said relay output module; Comprise ac contactor control circuit; Said ac contactor control circuit comprises contactor, and contactor coil is serially connected with in the alternating current 220V loop with normal opened contact YK2, normally closed contact YK1, scram button TA1, and the auxiliary contact KM1 and the normal opened contact YK2 of contactor are connected in parallel.The present invention adopts two secondary contacts, and a secondary normal opened contact is used for contactor and closes a floodgate, and another secondary normally closed contact is used for contactor combined floodgate separating brake, utilizes the auxiliary contact of contactor to be combined into self-holding circuit during combined floodgate.
Relay output module also comprises the PhotoMos relay that special use can frequently be controlled, and is used for the electromagnetic lock switching controls by period control and charging cable for the pile body lamp box, guarantees its long-time running reliability.
Further; Said CPU module comprises high-powered DSP; It has the real-time control ability of high efficiency digital signal processing capability and MCU (microprogram control unit) concurrently; Interrupt management is powerful, is used for calculating analog quantity, collection digital signal, protection logical operation, charging control and other miscellaneous functions etc.;
Further; Said digital signal input module is used to gather the switching value input; This low-voltage variation measurement and control unit inside carries the 24V power supply, therefore only need insert the status signal that idle contact just can obtain parts such as A.C. contactor, air switch, electromagnetic lock, scram button.
Further, said defencive function based on charging pile charging safety and design safe in utilization specifically comprises overcurrent protection, short circuit blocking protection, electric voltage exception protection, leakage current protection, overload protection, underload protection, not corresponding protection etc.Wherein overcurrent protection, electric voltage exception protection, overload protection are conventional relaying protection function.The leakage current protection is to the design of human body handling safety, and the leakage current of gathering charging pile prevents electric shock accidents.The short circuit blocking protection is to the breaking capacity design of A.C. contactor, and locking contactor during the charging pile internal short-circuit is carried out breaking operation so that get out of the way air cock.Adopt the constant voltage charge pattern when charging process finishes soon, this moment, charging current was very little, because of lithium battery can not bear long floating charge, provided underload protection to cut off charge power supply for preventing that battery is impaired.To the charging cable connection status not corresponding protection is provided, guarantees that pile body is not charged under the improper plugging condition of charging cable.
After adopting the low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile of the utility model; Charging pile is furnished with other annexes will realize human-computer interaction function, charging controlled function, metering and billing function, state acquisition function, analog acquisition function, communication monitoring function, charge protection function etc.; Intellectuality, the automatization level of electrically-charging equipment have been improved; Realize the unmanned or few man on duty operation of electrically-charging equipment, reach electrically-charging equipment economy, safety, efficient operation.
Description of drawings
Fig. 1 is the low-voltage variation measurement and control unit control panel sketch map of the utility model;
Fig. 2 is the low-voltage variation measurement and control unit module outline drawing of the utility model;
Fig. 3 is the voltage sampling circuit schematic diagram;
Fig. 4 is an electric current two-stage sample circuit schematic diagram;
Fig. 5 is the external cabling sketch map of this low-voltage variation measurement and control unit;
Fig. 6 is a contactor control loop schematic diagram;
Fig. 7 is a low-voltage variation measurement and control unit CPU module principle schematic.
Embodiment
With reference to the accompanying drawings and combine embodiment that the present invention is further described, but the present invention is not limited in given example.The module outline drawing of the utility model device is as shown in Figure 2, and sampling ABS moulds the housing box body, and mounting means is a 35mm standard guide rail.
When alternating-current charging pile charged normal, this low-voltage variation measurement and control unit was gathered charging voltage and charging current in real time, was used for man-machine interface on the one hand and showed that the confession user checks, can calculate charge capacity and be used for metering and billing through the communication teletransmission simultaneously on the other hand.Metering and billing needs electric current, voltage to have higher certainty of measurement; The accurate measuring range of electric power system correlation standard voltage is 1.2 times a rated voltage; The accurate measuring range of electric current is 2 times a rated current, does not wait and the protective current measuring range is 10 to 20 times.Voltage signal we by the routine collection, principle is as shown in Figure 3, through the one-level operational amplifier again LPF insert AD.And, how can guarantee the certainty of measurement that the First Astronautic Research Institute for Measurement and Test needs for same current sample source, the measuring range that can satisfy protection again becomes a difficult problem of needing solution badly.We adopt the amplifier of two-stage different gains to insert AD respectively for current sample for this reason; As shown in Figure 4; Previous stage IA O1 satisfies the required scope of protection; Back one-level IA O2 satisfies certainty of measurement, and two-stage signal is all carried out the Fu Shi computing and calculated amplitude after the AD conversion, selects wherein one-level participation logical operation according to range of signal automatically by CPU.
Alternating-current charging pile adopts alternating current 220V voltage as charge power supply; Power supply control adopts air switch Q1 to add the form of A.C. contactor KM; As shown in Figure 6; Air switch Q1 is used for the protection of big short circuit current, and contactor KM is used for normal loop deciliter, and charging normal control also is to realize through controlling contactor.As everyone knows, contactor is a kind of widely used device for switching, is mainly used in frequent connection or disjunction AC and DC circuit and jumbo control circuit; But remote operation; Its principle is to utilize coil to flow through electric current to produce magnetic field, makes contact closure, to reach the control purpose.For making the contactor closure let charging pile export electric energy, contactor coil needs long-time energising, and the low-voltage variation measurement and control unit then need provide a group relay to be serially connected with in this wire loop.Because the charging pile charging interval is longer, usually several hrs to tens hour does not wait, and is to increase the relay life-span; This low-voltage variation measurement and control unit provides two secondary contacts, and a secondary normal opened contact YK2 is used for contactor and closes a floodgate, and another secondary normally closed contact YK1 is used for the contactor separating brake; Utilize the auxiliary contact KM1 of contactor to be combined into self-holding circuit during combined floodgate; As shown in Figure 6, contactor coil is serially connected with in the alternating current 220V loop with normal opened contact YK2, normally closed contact YK1, scram button TA1, after the user inserts charging cable startup charging; This low-voltage variation measurement and control unit makes contactor coil charged closed normal opened contact YK2, and this moment, contactor was with adhesive.Its auxiliary contact KM1 was with closed short circuit normal opened contact YK2 when contactor closed, and the contactor control loop is with the self-sustaining conducting, and can break off normal opened contact YK2 this moment, thereby it is long charged that YK2 need not, and prolongs its useful life.In emergency circumstances, press scram button TA1 and also can break off the contactor coil loop, realize promptly stopping charging.For the electromagnetic lock switching controls by period control and charging cable of pile body lamp box, relay output module uses the special-purpose PhotoMos relay that can frequently control, guarantees its long-time running reliability in addition.
Device CPU is a high-powered DSP; It has the real-time control ability of high efficiency digital signal processing capability and MCU (microprogram control unit) concurrently; Can reach the arithmetic speed of 60,000,000 instruction/s (MIPS) under the 60MHz core frequency; Adopt Harvard structure, the program space and data space are separated addressing, support parallel processing.Chip integration has become FLASH, RAM and the abundant I/O module of suitable capacity, and has the timer that a plurality of tape input are caught, and interrupt management is powerful.Sheet has been expanded the outer high-speed RAM of a slice 128K x 16 bit slices, 32K x 8 Bits Serial EEPROM outward.CPU module principle schematic is as shown in Figure 7.
The low-voltage variation measurement and control unit adopts the modularization packaging power, and dust and moisture is anti-oxidation, and AC and DC is dual-purpose.External input voltage behind the anti-interference filtration loop, three groups of direct voltages that utilize this device of inversion principle output to need, promptly 5V, ± 12V and 24V, three groups of voltages and adopt floating ground mode all not altogether, and are continuous with shell.Wherein ,+5V is the working power of device embedded computer system, and ± 12V is the data acquisition system power supply, and 24V is used to drive relay.
Be to guarantee charging safety and safe in utilization, the defencive function of charging pile specifically comprises overcurrent protection, short circuit blocking protection, electric voltage exception protection, leakage current protection, overload protection, underload protection, not corresponding protection etc.Wherein overcurrent protection, electric voltage exception protection, overload protection are conventional relaying protection function, do not do too much description here.The leakage current protection is to the design of human body handling safety; When taking place to get an electric shock, shock current forms the loop through the earth, causes the inflow of charging current and flows out no longer balance; This unbalanced value is as reaching the predetermined action value, and this low-voltage variation measurement and control unit will be controlled A.C. contactor and cut off the electricity supply.Because of the breaking capacity of A.C. contactor limited; Under the Short-Circuit High Current situation, probe of contactor arcing fast, contact might be burnt damage; This moment, the low-voltage variation measurement and control unit was answered the locking contactor so that get out of the way air cock execution breaking operation, and this function is called the short circuit blocking protection.Constant voltage charge is adopted in the fast end of charging electric vehicle often; This moment, charging current was very little; Because of lithium battery can not bear long floating charge; For preventing that impaired low-voltage variation measurement and control unit of battery from providing underload defencive function, when being lower than set point for a long time, charging current will cut off charge power supply when judging.Some improper operating modes; As the end rear section user that charges does not cut off the electricity supply with regard to direct plug charging cable through the operation man-machine interface; For guaranteeing personal safety; This low-voltage variation measurement and control unit provides not corresponding protection, just cuts off the electricity supply when contactor detects less than the charging cable position signalling closing the position when judging, and guarantees that pile body is not charged.
Except that above-mentioned embodiment, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.
Claims (5)
1. a low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile comprises the analog quantity input module, is used to insert voltage, current signal, and converts voltage, current signal to small-signal access AD converter; It is characterized in that: also comprise relay output module: be used for the control of A.C. contactor and controlling of electromagnetic lock and lamp box in the charging pile; Power module: be used to provide the inner required direct current 24V of low-voltage variation measurement and control unit, ± 12V, 5V voltage; The CPU module is used for calculating analog quantity, collection digital signal, protection logical operation, charging control and other miscellaneous functions etc.; Digital signal input module: the status signal that is used to gather A.C. contactor, air switch, electromagnetic lock, scram button.
2. the low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile according to claim 1 is characterized in that: also comprise casing, said casing is the ABS plastic housing.
3. the low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile according to claim 1; It is characterized in that: said analog quantity input module comprises voltage input circuit and current input circuit; The voltage signal of said voltage input circuit comprises three-phase voltage, and voltage signal inserts AD converter again behind low-pass filter circuit behind the one-level operational amplifier; The current signal of said current input circuit inserts AD converter respectively after through the amplifier of two-stage different gains.
4. the low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile according to claim 1; It is characterized in that: said relay output module; Comprise ac contactor control circuit; Said ac contactor control circuit comprises contactor, and contactor coil is serially connected with in the alternating current 220V loop with normal opened contact YK2, normally closed contact YK1, scram button TA1, and the auxiliary contact KM1 and the normal opened contact YK2 of contactor are connected in parallel.
5. the low-voltage variation measurement and control unit that is used for electric vehicle alternating-current charging pile according to claim 4; It is characterized in that: relay output module also comprises the PhotoMos relay that can frequently control, is used for the electromagnetic lock switching controls by period control and charging cable for the pile body lamp box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120268479U CN202134943U (en) | 2011-07-27 | 2011-07-27 | Low-voltage protection measurement and control unit used for electric automobile AC charging post |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120268479U CN202134943U (en) | 2011-07-27 | 2011-07-27 | Low-voltage protection measurement and control unit used for electric automobile AC charging post |
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| Publication Number | Publication Date |
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| CN202134943U true CN202134943U (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120268479U Expired - Fee Related CN202134943U (en) | 2011-07-27 | 2011-07-27 | Low-voltage protection measurement and control unit used for electric automobile AC charging post |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218639A (en) * | 2014-08-22 | 2014-12-17 | 陕西中汽合力停车系统有限公司 | Electric system of charge pole of stereoscopic garage |
| CN108923379A (en) * | 2018-09-28 | 2018-11-30 | 广东绿网新能源科技有限公司 | Overcurrent and phase shortage the broken string TT&C system of electric car charging circuit |
| CN115065119A (en) * | 2022-06-29 | 2022-09-16 | 陕西光德分布式电站技术有限公司 | No-load active main loop power supply cutting-off system |
-
2011
- 2011-07-27 CN CN201120268479U patent/CN202134943U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218639A (en) * | 2014-08-22 | 2014-12-17 | 陕西中汽合力停车系统有限公司 | Electric system of charge pole of stereoscopic garage |
| CN108923379A (en) * | 2018-09-28 | 2018-11-30 | 广东绿网新能源科技有限公司 | Overcurrent and phase shortage the broken string TT&C system of electric car charging circuit |
| CN108923379B (en) * | 2018-09-28 | 2024-03-22 | 广东绿网新能源科技有限公司 | Overcurrent and open-phase line breakage measurement and control system of electric automobile charging line |
| CN115065119A (en) * | 2022-06-29 | 2022-09-16 | 陕西光德分布式电站技术有限公司 | No-load active main loop power supply cutting-off system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: NARI NANJING CONTROL SYSTEM LTD. Free format text: FORMER NAME: NANJING SINO-GERMAN PROTECTION CONTROL SYSTEM CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 210061 Jiangsu Province, Nanjing city high tech Development Zone of High Road No. 19-1 Patentee after: SGCC NARI Nanjing Control System Co., Ltd. Address before: 210061 Jiangsu Province, Nanjing city high tech Development Zone of High Road No. 19-1 Patentee before: Nanjing Sino-German Protection Control System Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120201 Termination date: 20170727 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |