CN106771576A - A kind of direct current energy meter for charging pile with Insulation monitoring function - Google Patents
A kind of direct current energy meter for charging pile with Insulation monitoring function Download PDFInfo
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- CN106771576A CN106771576A CN201710004632.9A CN201710004632A CN106771576A CN 106771576 A CN106771576 A CN 106771576A CN 201710004632 A CN201710004632 A CN 201710004632A CN 106771576 A CN106771576 A CN 106771576A
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- direct current
- charging pile
- energy meter
- insulation
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- 238000009413 insulation Methods 0.000 title claims abstract description 57
- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 230000006870 function Effects 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 9
- 230000003750 conditioning effect Effects 0.000 claims description 5
- 238000013500 data storage Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 abstract description 3
- 230000006855 networking Effects 0.000 abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention discloses a kind of direct current energy meter for charging pile with Insulation monitoring function, mainly it is made up of power subsystem and control system, control system is mainly indicated by master controller, metering circuit, 485 telecommunication circuits, display, memory, insulation detection device, state of insulation, button and battery circuit are constituted.Wherein metering circuit is mainly made up of current divider, electric resistance partial pressure networking and single-phase measurement chip.The positive and negative bus of charging pile direct current is connected by sampling resistor networking and current divider with computation chip input channel, and computation chip realizes the DC measurement function of electric energy meter by the voltage of collection, current signal；The positive and negative bus of direct current of charging pile is directly connected with insulation detection device realizes Insulation monitoring function, and the present invention has the characteristics of integration, miniaturization for detecting direct current energy metering and state of insulation.
Description
Technical field
The present invention relates to direct current energy meter technical field, more particularly to a kind of charging pile that is used for is with Insulation monitoring function
Direct current energy meter.
Background technology
With the high speed development of new-energy automobile industry, as the power resources of new-energy automobile, electric automobile charging pile
The market demand also increase year by year.The national standard requirement of newest electric automobile charging pile, the direct current output of charging pile should match somebody with somebody
There are direct current energy meter and insulation detection device.Direct current energy meter is used to measure the electrically ginseng such as charging pile output voltage, electric current, power
Number.Insulation detection device is used for the state of insulation of real-time detection charging pile dc bus, is made with the safety for ensuring charging pile equipment
With.
The direct current energy meter and insulating detection equipment for being currently applied to charging pile be all in the form of independent part install and
Use.
Such as Patent No. 201220352766.2, entitled a kind of direct current energy meter, it discloses direct current energy meter
Technical scheme, " direct current energy meter includes shell, main control chip (1), computation chip (2) in direct current energy watch case,
Clock chip (3), 485 chips (4), display screen (5), lcd drive chip (6) and power module (7), described computation chip
(2), clock chip (3), 485 chips (4), lcd drive chip (6) are connected with main control chip (1) respectively with power module (7),
Described clock chip (3) is also connected with power module (7).”
The direct current energy meter of above-mentioned technical proposal only has function of measuring, the function without Insulation monitoring, if to expire
The requirement of the newest GB of foot and the demand for security of charging pile, in addition it is also necessary to extra increase insulating detection equipment, it is installed and uses
Mode is minimized with intellectuality and increased the complexity of charging pile internal electric connection and comprehensive not only bad for charging pile
Synthesis is originally.
The content of the invention
The technical problems to be solved by the invention are to provide and a kind of are applied to charging pile and with the straight of Insulation monitoring function
Stream electric energy meter.
In order to solve the above problems, the present invention is achieved by the following technical solutions：
A kind of direct current energy meter for charging pile with Insulation monitoring function, is made up of power subsystem and control system,
Power subsystem is that master controller and its connected device provide electric power.
Control system by master controller, metering circuit, 485 telecommunication circuits, display, memory, insulation detection device, absolutely
Edge state instruction, button and battery circuit are constituted.
Insulation detection device includes resistance bridge network, controllable relays switch, signal conditioning circuit and MCU parts periphery electricity
Road.Resistance bridge network is by resistance Rf+、Rf-、R0+、R0-、Rc+、Rc-Composition, wherein Rc+、Rc-It is sampling resistor.Charging pile direct current is female
Line DC+, DC- and reference ground PGND with by resistance Rf+、Rf-、R0+、R0-、Rc+、Rc-The resistance bridge network connection of composition.
Gate-controlled switch K3、K4Resistance R is attempted by respectively0+、R0-Two ends, gate-controlled switch K3、K4Break-make change resistance bridge network
Electric resistance partial pressure state；Relay switch K1、K2Positive and negative resistance bridge is sealed in respectively and is connected with the GPIO pins of MCU, realize exhausted
The break-make control of edge detection；Sampling resistor Rc+、Rc-Export the ADC sampling pins that MCU is finally entered through signal conditioning circuit.
Insulation detection device is connected with master controller, and main controller controls insulation detection device carries out Insulation monitoring, insulation
Testing result is fed back to master controller by detection means, and main controller is by the Insulation monitoring state instruction that connects by Insulation monitoring knot
Fruit is shown.
Wherein metering circuit is mainly made up of current divider, sampling resistor and single-phase measurement chip.The positive and negative mother of charging pile direct current
Line is connected by sampling resistor and current divider with single-phase measurement chip input channel, and single-phase measurement chip is connected with master controller.
Single-phase measurement chip realizes the DC measurement function of electric energy meter by the voltage that gathers, current signal.Main controller controls are single-phase
Computation chip carries out electric energy metrical to the sampled voltage of direct current stake, current parameters, while single-phase measurement chip is by data message
Master controller is fed back to, master controller is shown relevant parameter by LCD/LED display units.
Master controller periphery is also connected with communication unit, button and memory respectively.The master controller communicates electricity with 485
Road is connected, and 485 telecommunication circuit can enter row data communication with external device.The master controller is connected with button, described
Button can be inquired about direct current table display parameters.The master controller is connected with storage and battery circuit, is deposited with meeting data
Storage and the accuracy of real-time clock.
Beneficial effect：
Compared with prior art, the present invention has taken into full account the ancillary equipment demand of charging pile direct current output, knot to the present invention
The function of direct current energy meter and insulation detection device has been closed, during Insulation monitoring function increased into direct current energy meter, can not only
Carrying out accurate measurement to charging pile direct current output electric energy can be with the state of insulation of real-time judgment charging pile.
The present invention solves following several technical problems simultaneously：
1. the electric energy metrical and measurement of electric parameter of charging pile direct current output are realized；
2. real-time storage and display are carried out to measuring parameter；
3. data exchange can be carried out by 485 communication interfaces with ancillary equipment；
4. the Insulation monitoring function of charging pile is realized；
5. the integration and miniaturization of charging pile ancillary equipment are realized.
The integration and miniaturization of charging pile ancillary equipment are realized using technical scheme, charging pile is saved
Arrangement space, simplify electrical connection, reduce cost.
Brief description of the drawings
Fig. 1 is a kind of direct current energy meter structure chart with Insulation monitoring function of the present invention.
Fig. 2 is insulation detection device schematic diagram of the present invention.
Specific embodiment
1 and 2 pair of specific embodiment of the invention is described further below in conjunction with the accompanying drawings.
Fig. 1 is a kind of direct current energy meter structure chart with Insulation monitoring function of the present invention, direct current energy meter power subsystem
Constituted with control system.
Control system by Shanghai hard iron spring master controller HT6015, metering circuit, 485 telecommunication circuits, display, memory,
Insulation detection device, state of insulation are indicated, button and battery circuit are constituted.Master controller connects metering circuit, 485 communications respectively
Circuit, display, memory, insulation detection device, state of insulation instruction, button and battery circuit.Wherein metering circuit, 485
Telecommunication circuit realizes two-way information interaction with insulation detection device and master controller.
Wherein metering circuit is mainly made up of current divider, sampling resistor and Shanghai hard iron spring single-phase measurement chip HT7017, is adopted
Sample resistance realizes electric resistance partial pressure, and the positive and negative bus DC+ and DC- of charging pile direct current passes through sampling resistor and current divider and single-phase measurement
Chip input channel is connected, and single-phase measurement chip realizes the DC measurement function of electric energy meter by the voltage of collection, current signal.
The positive and negative bus of direct current of charging pile is directly connected with insulation detection device realizes Insulation monitoring function.
Master controller periphery refers to metering circuit, communication unit, display, memory, insulation detection device, state respectively
Show and connected with power subsystem, realize the functions such as metering, display, communication, data processing and the data storage of direct current energy meter.
Master controller is connected with 485 telecommunication circuits, 485 telecommunication circuit connection communication interfaces, 485 telecommunication circuits can with it is outer
Boundary's equipment enters row data communication.
Master controller is connected with button, and the button can be inquired about direct current table display parameters
Master controller is connected with storage and battery circuit, to meet the accuracy of data storage and real-time clock.
In embodiments of the invention, insulation detection device schematic diagram is as shown in Fig. 2 insulation detection device includes resistance bridge net
Network, controllable relays switch, signal conditioning circuit and MCU parts peripheral circuit.Resistance Rf+、Rf-、R0+、R0-、Rc+、Rc-Composition electricity
Resistance bridge network, wherein Rf+、R0+、Rc+With the R for connecting after series connectionf-、R0-、Rc-It is in parallel.
Charging pile dc bus DC+, DC- and reference ground PGND with by resistance Rf+、Rf-、R0+、R0-、Rc+、Rc-The electricity of composition
Resistance bridge network connection；Gate-controlled switch K3、K4Resistance R is attempted by respectively0+、R0-Two ends；Relay switch K1、K2Seal in respectively positive and negative
Resistance bridge is simultaneously connected with the GPIO pins of MCU, realizes the break-make control of Insulation monitoring；Sampling resistor Rc+、Rc-Output is adjusted through signal
Reason circuit finally enters the ADC sampling pins of MCU.
The course of work of insulation detection device：
When equipment needs to carry out Insulation monitoring, main controller controls relay K1、K2Closure, then by controlling controllable opening
Close K3、K4Break-make change resistance bridge network electric resistance partial pressure state.If U1And U2Respectively gate-controlled switch K3、K4During disconnection, just,
Voltage of negative busbar DC+, DC- to car body PGND；U1' and U2' respectively switch K3、K4During closure, positive and negative bus DC+, DC- couple
The voltage of car body PGND；The equivalent insulaion resistance R of positive and negative bus can be tried to achieve according to electric bridge equationp、RnComputing formula is as follows：
Wherein, U1、U2、U1' and U2' can be by sampling resistor Rc+、Rc-The sampled voltage at two ends is calculated.Calculate
Equivalent insulating resistance value Rn, the Rp of the positive and negative bus of charging pile direct current output to reference ground.It is above-mentioned to try to achieve according to national standard
Effect insulating resistance value RnAnd RpSmaller be considered as the insulaion resistance R of whole charging pile systemJ.Assuming that UDCIt is the positive and negative mother of charging pile
Line voltage, works as RJ/UDCDuring >=100 Ω/V, judge that insulating properties are qualified, work as RJ/UDCDuring 100 Ω of ＜/V, the insulation of system is judged
Performance is unqualified.
Claims (8)
1. a kind of direct current energy meter for charging pile with Insulation monitoring function, the direct current energy meter is by power subsystem and control
System composition processed, it is characterised in that：The control system is provided with insulation detection device, and the insulation detection device includes resistance bridge
Network, controllable relays switch, signal conditioning circuit and MCU parts peripheral circuit；Charging pile dc bus DC+, DC- and reference
Ground PGND with by resistance Rf+、Rf-、R0+、R0-、Rc+、Rc-The resistance bridge network connection of composition；Gate-controlled switch K3、K4It is attempted by respectively
Resistance R0+、R0-Two ends；Relay switch K1、K2Positive and negative resistance bridge network is sealed in respectively and the GPIO pins with MCU connect respectively
Connect, realize the break-make control of Insulation monitoring；Sampling resistor Rc+、Rc-Export the ADC sampling pipes for entering MCU through signal conditioning circuit
Pin.
2. a kind of direct current energy meter for charging pile with Insulation monitoring function according to claim 1, its feature exists
Be provided with master controller in, the control system, the master controller connect respectively metering circuit, 485 telecommunication circuits, display,
Memory, insulation detection device, state of insulation instruction, button and battery circuit.
3. a kind of direct current energy meter for charging pile with Insulation monitoring function according to claim 2, its feature exists
In：The metering circuit is made up of current divider, sampling resistor and single-phase measurement chip；The positive and negative bus of charging pile direct current is by adopting
Sample resistance and current divider are connected with single-phase measurement chip input channel；Single-phase measurement chip is connected with master controller.
4. a kind of according to Claims 2 or 3 has the direct current energy meter of Insulation monitoring function, its feature for charging pile
It is：The metering circuit carries out electric parameter collection and electric energy metrical
5. a kind of direct current energy meter for charging pile with Insulation monitoring function according to claim 2, its feature exists
In：485 telecommunication circuits being connected with master controller enter row data communication with external device.
6. a kind of direct current energy meter for charging pile with Insulation monitoring function according to claim 2, its feature exists
In：The electric parameter of the display display collection being connected with master controller
7. a kind of direct current energy meter for charging pile with Insulation monitoring function according to claim 2, its feature exists
In：The button being connected with the master controller, operation is interacted by the button, and the parameter that direct current table shows is looked into
Ask.
8. a kind of direct current energy meter for charging pile with Insulation monitoring function according to claim 2, its feature exists
In：The storage being connected with master controller and battery circuit, carry out data storage and keep the accuracy of real-time clock.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016212134590 | 2016-11-08 | ||
| CN201621213459 | 2016-11-08 |
Publications (1)
| Publication Number | Publication Date |
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| CN106771576A true CN106771576A (en) | 2017-05-31 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107765149A (en) * | 2017-10-13 | 2018-03-06 | 上海钛昕电气科技有限公司 | The insulation detection device of integrated multifunction |
| CN109270383A (en) * | 2018-11-08 | 2019-01-25 | 国网江西省电力有限公司电力科学研究院 | A kind of non-intrusion type charging pile automatic testing method |
| CN109406977A (en) * | 2018-11-13 | 2019-03-01 | 深圳威迈斯电源有限公司 | A kind of two-way Vehicular charger insulation detecting circuit and its detection method |
| CN109444507A (en) * | 2018-10-31 | 2019-03-08 | 山东鲁能智能技术有限公司 | A kind of electric car direct-current charging post charging voltage Acquisition Circuit, Insulation Inspection System and method |
| CN109490619A (en) * | 2018-10-12 | 2019-03-19 | 国网浙江省电力有限公司丽水供电公司 | A kind of direct-current charging post high accuracy number metering device |
| CN111638481A (en) * | 2020-06-12 | 2020-09-08 | 浙江瑞银电子有限公司 | Large-current direct current ammeter and calibration method thereof |
| CN111722044A (en) * | 2020-06-29 | 2020-09-29 | 国网山东省电力公司电力科学研究院 | Direct current charging pile testing method, device and equipment based on frequency sweep calibration shunt |
| CN111766554A (en) * | 2020-06-12 | 2020-10-13 | 浙江瑞银电子有限公司 | Direct current ammeter with wide metering range |
| CN116008655A (en) * | 2023-02-13 | 2023-04-25 | 山东省计量科学研究院 | Electric energy metering device for measuring bidirectional DC converter |
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| CN201965190U (en) * | 2010-12-31 | 2011-09-07 | 杭州奥能电源设备有限公司 | Insulation detecting device for direct current system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107765149A (en) * | 2017-10-13 | 2018-03-06 | 上海钛昕电气科技有限公司 | The insulation detection device of integrated multifunction |
| CN109490619A (en) * | 2018-10-12 | 2019-03-19 | 国网浙江省电力有限公司丽水供电公司 | A kind of direct-current charging post high accuracy number metering device |
| CN109444507A (en) * | 2018-10-31 | 2019-03-08 | 山东鲁能智能技术有限公司 | A kind of electric car direct-current charging post charging voltage Acquisition Circuit, Insulation Inspection System and method |
| CN109444507B (en) * | 2018-10-31 | 2021-08-20 | 山东鲁软数字科技有限公司智慧能源分公司 | Charging voltage acquisition circuit of electric automobile direct current charging pile, insulation detection system and method |
| CN109270383A (en) * | 2018-11-08 | 2019-01-25 | 国网江西省电力有限公司电力科学研究院 | A kind of non-intrusion type charging pile automatic testing method |
| CN109406977A (en) * | 2018-11-13 | 2019-03-01 | 深圳威迈斯电源有限公司 | A kind of two-way Vehicular charger insulation detecting circuit and its detection method |
| CN109406977B (en) * | 2018-11-13 | 2020-05-26 | 深圳威迈斯新能源股份有限公司 | Insulation detection circuit and detection method for bidirectional vehicle-mounted charger |
| CN111638481A (en) * | 2020-06-12 | 2020-09-08 | 浙江瑞银电子有限公司 | Large-current direct current ammeter and calibration method thereof |
| CN111766554A (en) * | 2020-06-12 | 2020-10-13 | 浙江瑞银电子有限公司 | Direct current ammeter with wide metering range |
| CN111722044A (en) * | 2020-06-29 | 2020-09-29 | 国网山东省电力公司电力科学研究院 | Direct current charging pile testing method, device and equipment based on frequency sweep calibration shunt |
| CN116008655A (en) * | 2023-02-13 | 2023-04-25 | 山东省计量科学研究院 | Electric energy metering device for measuring bidirectional DC converter |
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