CN110346682A - Electric car dcdc converter exports connection status detection circuit and method - Google Patents
Electric car dcdc converter exports connection status detection circuit and method Download PDFInfo
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- CN110346682A CN110346682A CN201910630404.1A CN201910630404A CN110346682A CN 110346682 A CN110346682 A CN 110346682A CN 201910630404 A CN201910630404 A CN 201910630404A CN 110346682 A CN110346682 A CN 110346682A
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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Abstract
The invention discloses a kind of electric car dcdc converter output connection status detection circuit and methods, circuit includes that the output end of dcdc converter is connect through positive output line beam with fuse, the fuse is connect with 12V battery, the detection circuit further includes DCDC output voltage detecting circuit, first voltage detection circuit, second voltage detection circuit, battery output voltage detecting circuit, its output end is separately connected the input terminal of control electricity, and the control circuit judges the connection status between dcdc converter and 12V battery according to collected voltage data.The present invention has the advantages that acquiring the voltage of the different location connected between dcdc converter and 12V battery by circuit, connection status is judged according to voltage, it is simple and quick reliable, dcdc converter is realized for the function of connection status fault alarm.
Description
Technical field
The present invention relates to electric car dcdc converter detection field, in particular to a kind of electric car dcdc converter is defeated
Connection status detection circuit and method out.
Background technique
As electric vehicle engineering develops, dcdc converter from the rigid line of early stage control to it is current have CAN communication and
Diagnostic function, but dcdc converter low pressure positive output line beam and export insurance silk connection status are not detected and are examined substantially
It is disconnected.
Dcdc converter low voltage outlet terminals and bundle of outputs connection type are mostly that aerial plug-in unit or terminal add spiral shell at present
Bolt is fixed, and anode wiring harness is connect with 12V battery by fuse.Aerial plug-in unit connects not in place, the withdraw of the needle, bolt fixing terminal
The problems such as loosening, fuse disconnect promptly and accurately cannot be detected and be reported.Circuit in the prior art can not be accomplished to this
It is detected and carries out fault detection and reported.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of outputs of electric car dcdc converter to connect
State detection circuit and method, for detecting the connection status between the output end of dcdc converter and 12V battery.
To achieve the goals above, the technical solution adopted by the present invention are as follows: electric car dcdc converter output connection shape
State detection circuit, the output end including dcdc converter are connect through positive output line beam with fuse, and the fuse and 12V store
Battery connection, the detection circuit further include DCDC output voltage detecting circuit, first voltage detection circuit, second voltage detection
Circuit, battery output voltage detecting circuit, the DCDC voltage detecting circuit are used to detect the output end electricity of dcdc converter
Pressure, output end connect to the control circuit；The first voltage detection circuit connect one with the bundle of outputs for detecting fuse
The other end voltage of the voltage at end, fuse is detected by second voltage detection circuit, the first voltage detection circuit, the second electricity
The output end of pressure detection circuit is connect with the input terminal of control circuit respectively, and the battery output voltage detecting circuit is for examining
Survey 12V battery both end voltage, the input terminal connection of output end and control circuit；The control circuit is according to collected electricity
Pressure data judge the connection status between dcdc converter and 12V battery.
The DCDC output voltage detecting circuit, first voltage detection circuit, second voltage detection circuit, battery output
Voltage detecting circuit obtains corresponding voltage data by electric resistance partial pressure mode respectively and is sent in control circuit.
The control circuit is the control chip integrated in dcdc converter.
The DCDC output voltage detecting circuit includes resistance R1, resistance R2, one end of resistance R1 and dcdc converter
Low-voltage output connection, the other end are grounded by resistance R2, and output terminal and control are drawn on the line between resistance R1, R2
The input terminal of circuit connects.
The first voltage detection circuit includes resistance R3, R4, the anode of positive output line Shu Yiduan and dcdc converter
Connection, the other end connect with fuse, connect with fuse junction extraction voltage test point with one end of resistance R3, resistance
The other end of R3 is grounded by resistance R4, and the defeated of output terminal connection control circuit is drawn on the line between resistance R3, R4
Enter end.
The second voltage detection circuit includes resistance R5, R6, the positive terminal connecting terminal of the fuse and battery
Connection is drawn wiring in junction and is connect with one end of resistance R5, and the other end of resistance R5 is grounded through resistance R6, resistance R5,
The input terminal that wiring and control circuit are drawn between R6 connects.
The accumulator voltage detecting circuit includes resistance R7, R8, and the anode of 12V battery connects with one end of resistance R7
It connects, the other end of resistance R7 is grounded through resistance R8, and the input terminal that terminals and control circuit are drawn between resistance R7 and R8 connects.
Electric car dcdc converter exports the detection method of connection status detection circuit, and the control circuit acquires DCDC
Converter output terminal to detected between 12V battery electricity voltage data；The voltage data wherein acquired includes: dcdc converter
Output end output voltage V_DC, positive output line beam and fuse junction voltage data V_SEN1, fuse and 12 accumulator positives
Pole junction voltage V_SEN2, 12V battery both ends real-time voltage V_KL30；
Control circuit judges that dcdc converter exports connection status according to the voltage data of acquisition:
Work as V_DCAnd V_SEN1Pressure difference when being less than or equal to preset threshold Δ V2, dcdc converter positive output terminals and anode
Between the bundle of outputs, good connection between fuse and 12V accumulator positive pole；
As Vo and V_SEN1Pressure difference when being greater than preset threshold Δ V2, then dcdc converter positive output terminals and harness it
Between or fuse and 12V battery junction terminal connection status failure；
Work as V_SEN1And V_SEN2When equal, illustrate junction, fuse and the 12V electric power storage of positive output line beam and fuse
The terminal good connection of pond junction, and low pressure export insurance silk is intact；If working as V_SEN1And V_SEN2It is unequal
When, illustrate that the terminal connection status of the junction of positive output line beam and fuse, fuse and 12V battery junction is asked
Topic or low pressure export insurance silk are fusing；
Work as V_SEN2And V_KL30When equal, illustrate the terminal good connection of fuse Yu 12V battery junction；Such as
Fruit V_SEN2And V_KL30When unequal, illustrate that fuse and the terminal connection status of 12V battery junction are problematic, or
There are problems for KL30 harness.
Preset threshold Δ V2 is under dcdc converter maximum output current operating condition, from V_KL30To V_SEN1Due to electrode line
Beam resistance and contact resistance and the maximum voltage difference Δ V2 generated.
Judging result is uploaded to vehicle alarm after judging connection status according to voltage data for control circuit or vehicle is shown.
The present invention has the advantages that acquiring the different location connected between dcdc converter and 12V battery by circuit
Voltage, judge connection status according to voltage, it is simple and quick reliable, realize dcdc converter for connection status failure report
Alert function, while can accomplish to judge specific fault type, abort situation of connection status etc..Circuit structure letter simultaneously
Single reliable, at low cost, it is convenient to realize.
Detailed description of the invention
Below to each width attached drawing of description of the invention expression content and figure in label be briefly described:
Fig. 1 is detection schematic diagram of the present invention；
Fig. 2 is the circuit diagram of detection circuit of the present invention.
Appended drawing reference in figure is respectively as follows: 1, power battery；2, dcdc converter；3,12V battery；4, fixed point 1；5
Positive export insurance silk；6, fixed point 2；
Specific embodiment
A specific embodiment of the invention is made further detailed below against attached drawing by the description to optimum embodiment
Thin explanation.
The present invention using dcdc converter detection dcdc converter positive output line beam and fuse connection status and and
When accurately report.Itself output end, the bundle of outputs, export insurance silk and 12V battery is detected using dcdc converter to connect two-by-two
Three voltage values in place are connect, just according to the judgement of sampled voltage numerical value, the positive output line beam resistance of real steering vectors and contact resistance value
Whether the pole bundle of outputs and export insurance silk are reliably connected.
It is dcdc converter input termination power battery high pressure in the work of dcdc converter, has first passed around inductance and electricity
The filter for holding composition carries out hv filtering, is by high-voltage d. c inverse transform using high-frequency pulse width modulation (PWM) technology
Alternating voltage, alternating voltage are input to the primary side of high frequency transformer, and transformer secondary exports induced voltage, by rectifying and wave-filtering it
After export, output voltage be vehicle low-pressure system power supply, while for 12V battery charge.Voltage and current sample road is to output
Voltage and current sample value, sampled voltage are output to control circuit, and control circuit controls power circuit by control algolithm, realize
Low-pressure end stablizes output.DCDC output cathode fuse rated current is larger, and both ends are fixed using bolt substantially.
As shown in Figure 1, the output cathode of dcdc converter passes through aerial plug-in unit or connecting terminal and positive output line Shu Lian
It connects；The anode wiring harness other end connects positive export insurance silk and 1 harness of voltage detecting, terminal for positive wire harness, fuse terminal and
1 Wiring harness terminal of voltage detecting makes to be bolted together, and forms fixed point 1；2 harness of fuse another terminal and voltage detecting
Terminal makes to be fixed by bolts on 12V accumulator positive pole connecting terminal, forms fixed point 2.Voltage detecting 1 and voltage detecting 2
The voltage input of two o'clock is into DCDC.12V battery is the power supply of dcdc converter control circuit by KL30 line.
Corresponding fixed point 1 is test point 1, that is, the test point of first voltage detection circuit, and 1 harness of voltage detecting is
The detection harness of first voltage detection circuit, first voltage detection circuit include resistance R3, R4, positive output line Shu Yiduan with
The anode connection of dcdc converter, the other end and fuse are connected to fixed point 1, are being voltage detecting with fuse junction
Point will test and be connected to test point with harness and connect with one end of resistance R3, and the other end of resistance R3 is grounded by resistance R4,
The input terminal of output terminal connection control circuit is drawn on line between resistance R3, R4.
Corresponding fixed point 2 is test point 2, and the voltage of the test point is detected using second voltage detection circuit, is passed through
2 harness of voltage detecting, which is connected on test point, to be connect by will test 2 harness with second voltage detection circuit, second voltage detection
Circuit includes resistance R5, R6, and the positive terminal connecting terminal connection of the fuse and battery draws wiring and electricity in junction
One end connection of R5 is hindered, the other end of resistance R5 is grounded through resistance R6, and wiring and control circuit are drawn between resistance R5, R6
Input terminal connection.
The voltage of detection further includes DCDC output voltage signal, is realized using DCDC output voltage detecting circuit, DCDC
Output voltage detecting circuit includes resistance R1, resistance R2, and one end of resistance R1 and the low-voltage output of dcdc converter connect, separately
One end is grounded by resistance R2, and the input terminal that output terminal and control circuit are drawn on the line between resistance R1, R2 connects.
Detecting voltage further includes 12V accumulator voltage detecting circuit, and accumulator voltage detecting circuit includes resistance R7, R8,
The anode of 12V battery is connect with one end of resistance R7, and the other end of resistance R7 is grounded through resistance R8, is drawn between resistance R7 and R8
Terminals and the input terminal of control circuit connect out.
All voltage signals detected are input to the input terminal of control circuit, and control circuit is according to collected voltage number
It is judged that the connection status between dcdc converter and 12V battery.Control circuit is the control core with data-handling capacity
Piece or processing chip.It can be realized using the dsp chip or single-chip microcontroller on basis, for save the cost, simplify design, using DCDC
Control chip in converter is realized by the control chip in dcdc converter to realize and analyzes voltage to reach connection status
Judgement.
Dcdc converter detection positive output terminals are located at the voltage value V_DC of enclosure interior, that is, DCDC output end electricity
Pressure, as the control signal of output voltage, V_DC is input to control circuit, control circuit collection voltages after R1, R2 partial pressure
Value is V_DC*R2/ (R1+R2), controls chip by program and voltage value is converted to output voltage V_DC.1 voltage V_ of fixed point
SEN1 is input to control circuit after R3, R4 partial pressure, and control circuit collection voltages value is V_SEN1*R4/ (R3+R4), control
Voltage value is converted to V_SEN1 by program by chip.2 voltage V_SEN2 of fixed point is input to control after R5, R6 partial pressure
Circuit, control circuit collection voltages value are V_SEN2*R6/ (R5+R6), control chip by program and voltage value is converted to V_
SEN2.KL30 voltage V_KL30 is input to control circuit after R7, R8 partial pressure, and control circuit collection voltages value is Vo*R8/
(R7+R8), voltage value is converted to V_KL30 by program by control chip.
Under dcdc converter off position, the voltage of 12V battery is V_BAT, V_DC ratio V_BAT high Δ V1, with reality
It is now the function of baby battery charging.Under DCDC maximum output current operating condition, from Vo (battery voltage) to V_SEN1 because being positive
Polar curve beam resistance and contact resistance and the maximum voltage difference that generates is Δ V2.V_SEN1 and V_SEN2 are equal, V_SEN2 and V_
KL30 is equal, and V_KL30 is 12V battery both ends real-time voltage.Δ V1 is much larger than Δ V2.
Control circuit judges connection status according to the voltage data of acquisition and uploads fault-signal, in dcdc converter
It controls and integrates state judging method in chip to realize the judgement for connection status, judgment method includes:
When the pressure difference of V_DC and V_SEN1 is less than or equal to Δ V2, illustrate dcdc converter positive output terminals and harness it
Between, the terminal good connection at fixed point 2.If the pressure difference of Vo and V_SEN1 is greater than Δ V2, illustrate dcdc converter
Terminal connection status between positive output terminals and harness or at fixed point 2 is problematic.
As V_SEN1 and V_SEN2 equal, illustrate the terminal good connection at fixed point 1 and fixed point 2, and low
It is intact for pressing export insurance silk.If illustrating the end at fixed point 1 and fixed point 2 as V_SEN1 and V_SEN2 unequal
Sub- connection status is problematic or low pressure export insurance silk is fusing.
As V_SEN2 and V_KL30 equal, illustrate the terminal good connection at fixed point 2.If V_SEN2 and V_
When KL30 is unequal, illustrate that terminal connection status at fixed point 2 is problematic or KL30 harness there are problems.
Data are uploaded to entire car controller or car body controller according to the malfunction of judgement by control circuit, then by whole
Vehicle controller issues alarm signal or control Vehicular display device shows failure.
Obviously present invention specific implementation is not subject to the restrictions described above, as long as using method concept and skill of the invention
The improvement for the various unsubstantialities that art scheme carries out, it is within the scope of the present invention.
Claims (9)
1. electric car dcdc converter exports connection status detection circuit, the output end including dcdc converter is exported through anode
Harness is connect with fuse, and the fuse is connect with 12V battery, it is characterised in that: the detection circuit further includes DCDC
Output voltage detecting circuit, first voltage detection circuit, second voltage detection circuit, battery output voltage detecting circuit, institute
It states DCDC voltage detecting circuit and is connected to the control circuit for detecting the output end voltage of dcdc converter, output end；It is described
First voltage detection circuit is for detecting the voltage that fuse connect one end with the bundle of outputs, and the other end voltage of fuse is by the
The detection of two voltage detecting circuits, the first voltage detection circuit, the output end of second voltage detection circuit are electric with control respectively
The input terminal on road connects, the battery output voltage detecting circuit for detecting 12V battery both end voltage, output end with
The input terminal of control circuit connects；The control circuit judges dcdc converter and 12V electric power storage according to collected voltage data
Connection status between pond.
2. electric car dcdc converter as described in claim 1 exports connection status detection circuit, it is characterised in that: described
DCDC output voltage detecting circuit, first voltage detection circuit, second voltage detection circuit, battery output voltage detecting circuit
Corresponding voltage data is obtained by electric resistance partial pressure mode respectively to be sent in control circuit.
3. electric car dcdc converter as described in claim 1 exports connection status detection circuit, it is characterised in that: described
Control circuit is the control chip integrated in dcdc converter.
4. electric car dcdc converter as claimed in claim 1 or 2 exports connection status detection circuit, it is characterised in that:
The DCDC output voltage detecting circuit includes resistance R1, resistance R2, and one end of resistance R1 and the low pressure of dcdc converter export
End connection, the other end is grounded by resistance R2, and extraction output terminal and control circuit is defeated on the line between resistance R1, R2
Enter end connection.
5. electric car dcdc converter as claimed in claim 1 or 2 exports connection status detection circuit, it is characterised in that:
The first voltage detection circuit includes resistance R3, R4, and the anode connection of positive output line Shu Yiduan and dcdc converter are another
End is connect with fuse, is connect with fuse junction extraction voltage test point with one end of resistance R3, resistance R3's is another
End is grounded by resistance R4, and the input terminal of output terminal connection control circuit is drawn on the line between resistance R3, R4.
6. electric car dcdc converter as claimed in claim 1 or 2 exports connection status detection circuit, it is characterised in that:
The second voltage detection circuit includes resistance R5, R6, the positive terminal connecting terminal connection of the fuse and battery, even
It connects place's extraction wiring to connect with one end of resistance R5, the other end of resistance R5 is grounded through resistance R6, is drawn between resistance R5, R6
The connection of the input terminal of wiring and control circuit.
7. electric car dcdc converter as claimed in claim 1 or 2 exports connection status detection circuit, it is characterised in that:
The accumulator voltage detecting circuit includes resistance R7, R8, and the anode of 12V battery is connect with one end of resistance R7, resistance R7
The other end be grounded through resistance R8, the input terminal that terminals and control circuit are drawn between resistance R7 and R8 connects.
8. the detection side of electric car dcdc converter output connection status detection circuit as claimed in claim 1
Method, it is characterised in that:
The control circuit acquires dcdc converter output end to the voltage data for detecting electricity between 12V battery；Wherein acquire
Voltage data include: dcdc converter output end output voltage V_DC, positive output line beam and fuse junction voltage data
V_SEN1, fuse and 12 accumulator positive pole junction voltage V_SEN2, 12V battery both ends real-time voltage V_KL30；
Control circuit judges that dcdc converter exports connection status according to the voltage data of acquisition:
Work as V_DCAnd V_SEN1Pressure difference be less than or equal to preset threshold Δ V2 when, dcdc converter positive output terminals and anode output
Between harness, good connection between fuse and 12V accumulator positive pole；
As Vo and V_SEN1Pressure difference be greater than preset threshold Δ V2 when, then between dcdc converter positive output terminals and harness or
The terminal connection status failure of person's fuse and 12V battery junction；
Work as V_SEN1And V_SEN2When equal, illustrate that junction, fuse and the 12V battery of positive output line beam and fuse connect
The terminal good connection at place is connect, and low pressure export insurance silk is intact；If working as V_SEN1And V_SEN2When unequal, say
The terminal connection status of the junction of bright positive output line beam and fuse, fuse and 12V battery junction is problematic, or
Low pressure export insurance silk is fusing；
Work as V_SEN2And V_KL30When equal, illustrate the terminal good connection of fuse Yu 12V battery junction；If
V_SEN2And V_KL30When unequal, illustrate that the terminal connection status of fuse and 12V battery junction is problematic or KL30
There are problems for harness.
9. the detection method of electric car dcdc converter output connection status detection circuit as claimed in claim 8,
Be characterized in that: preset threshold Δ V2 is under dcdc converter maximum output current operating condition, from V_KL30To V_SEN1Due to electrode line
Beam resistance and contact resistance and the maximum voltage difference Δ V2 generated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910630404.1A CN110346682B (en) | 2019-07-12 | 2019-07-12 | Output connection state detection circuit and method for DCDC converter of electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910630404.1A CN110346682B (en) | 2019-07-12 | 2019-07-12 | Output connection state detection circuit and method for DCDC converter of electric vehicle |
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| CN110346682A true CN110346682A (en) | 2019-10-18 |
| CN110346682B CN110346682B (en) | 2021-08-31 |
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| CN112003469A (en) * | 2020-08-18 | 2020-11-27 | 奇瑞商用车（安徽）有限公司 | Structure for judging DC/DC output state and manufacturing method thereof |
| CN112485725A (en) * | 2020-10-21 | 2021-03-12 | 惠州市德赛西威汽车电子股份有限公司 | Device and method for detecting power line state of vehicle-mounted entertainment and instrument system |
| WO2022170959A1 (en) * | 2021-02-10 | 2022-08-18 | 华为数字能源技术有限公司 | Energy storage system, and detection method for energy storage system |
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| CN111929619A (en) * | 2020-08-17 | 2020-11-13 | 深圳市泰昂能源科技股份有限公司 | Detection circuit and detection method for battery connection abnormity |
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| CN112485725B (en) * | 2020-10-21 | 2022-10-28 | 惠州市德赛西威汽车电子股份有限公司 | Device and method for detecting power line state of vehicle-mounted entertainment and instrument system |
| WO2022170959A1 (en) * | 2021-02-10 | 2022-08-18 | 华为数字能源技术有限公司 | Energy storage system, and detection method for energy storage system |
| FR3123126A1 (en) | 2021-05-20 | 2022-11-25 | Psa Automobiles Sa | METHOD FOR FAILURE SUPERVISION OF AN ELECTRICAL INSULATION DEVICE AND TESTING OF A LOW VOLTAGE ELECTRICAL STORAGE IN AN ELECTRIFIED VEHICLE |
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