CN115963393B - Contact adhesion misjudgment and contact adhesion detection circuit and method - Google Patents
Contact adhesion misjudgment and contact adhesion detection circuit and method Download PDFInfo
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- CN115963393B CN115963393B CN202211696576.7A CN202211696576A CN115963393B CN 115963393 B CN115963393 B CN 115963393B CN 202211696576 A CN202211696576 A CN 202211696576A CN 115963393 B CN115963393 B CN 115963393B
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title description 9
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 238000002955 isolation Methods 0.000 claims description 28
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000002265 prevention Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
Abstract
The invention relates to the technical field of electric shock misjudgment detection circuits, and particularly discloses a contact adhesion misjudgment and contact adhesion detection circuit and a contact adhesion detection method. The arrangement of the circuit can reduce the sampling circuit, reduce the occupied board area, simplify the software logic strategy, accurately calculate the voltage difference value and prevent misjudgment from occurring in electric shock adhesion detection.
Description
Technical Field
The invention relates to the technical field of electric shock misjudgment detection circuits, in particular to a contact adhesion misjudgment and contact adhesion detection circuit and method.
Background
Currently, when a battery system uses contactors as on-off devices of positive and negative electrode circuits, each connection point of each contactor is connected to a collection plate through a sampling harness. The BMS of the battery collects the voltage of each connection point, and compares the voltages of the connection points when the contactor is not closed to judge whether the contactor is stuck or not.
In the prior art, each point of the contactor needs one path of sampling circuit, the circuits are more, the occupied board area is large, the AD port of the MCU is more used, the logic strategy on software is more complicated, the contact adhesion detection is misjudged, and the voltage difference value calculation is inaccurate.
Disclosure of Invention
The invention aims to provide a circuit and a method for misjudging contact adhesion and detecting contact adhesion, and aims to solve the technical problems that in the prior art, each point of a contactor needs one path of sampling circuit, the circuits are more, the occupied board area is large, the AD ports of an MCU (micro controller unit) are more used, the logic strategy on software is more complicated, the misjudgment of contact adhesion detection is misjudged, and the voltage difference value calculation is inaccurate.
In order to achieve the above purpose, the contact adhesion misjudgment and contact adhesion detection circuit comprises a battery voltage sampling isolation circuit, a battery voltage comparison circuit, a detection framework circuit, a control unit and an misjudgment prevention circuit, wherein the end D and the end C of the battery voltage sampling isolation circuit are respectively connected with the end C and the end D of the detection framework circuit, the end A, the end B, the end C and the end D of the battery voltage comparison circuit are respectively communicated with the end A, the end B, the end C and the end D of the detection framework circuit corresponding to the detection framework circuit, the end A and the end B of the misjudgment prevention circuit are respectively connected with the end A and the end B corresponding to the detection framework circuit, the end Vbat of the control unit is connected with the end lead of the Vbat of the battery voltage sampling isolation circuit, the end Ctl unit1 of the control unit is connected with the end Vbat of the battery voltage comparison circuit, and the end Vbat of the control unit is connected with the end Vbat of the control unit Vbat 2 of the control unit is connected with the end lead of the battery voltage comparison circuit.
The battery voltage sampling isolation circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C1, an isolation circuit U7, a chip U1, a chip U2 and an output analog quantity Vbat, one end of the resistor R1 is connected with one end of the resistor R3 at the negative end of the chip U1, the other end of the resistor R3 is connected with one end of the resistor R5 at the output end of the chip U1, the other end of the resistor R5 is communicated with the isolation circuit U7, one end of the resistor R2 is connected with one end of the resistor R4 at the positive end of the chip U1, the other end of the resistor R4 is connected with the ground end G1, one end of the resistor R6 is connected with one end of the resistor R9 at the negative end of the chip U2, the other end of the resistor R6 is connected with the other end of the isolation circuit U7 at the other end of the resistor R2 is connected with one end of the capacitor C2, and the other end of the resistor R4 is connected with the other end of the resistor R2 at the other end of the resistor R2 is connected with the ground end of the resistor C2.
Wherein the battery voltage comparison circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a capacitor C2, an isolation circuit U6, a relay K1, a relay K2, a chip U3, a chip U4 and an output analog quantity Vsys, one end of the resistor R11 is connected with one normally-closed contact of the relay K1, one end of the resistor R12 is connected with one normally-closed contact of the relay K1, the other end of the relay K1 is connected with the normally-closed contact of the other end, one end of the resistor R16 is connected with the negative end of the chip U3, the normally-closed contacts at two ends of the relay K1 are connected, the other end of the resistor R16 is connected with one end of the resistor R17 at the output end of the chip U3, the other end of the resistor R17 is connected with the isolation circuit U6 through wires, one end of the resistor R13 is connected with one end normally-closed contact of the relay K2, one end of the resistor R14 is connected with one end normally-open contact of the relay K2, the other end normally-open contact of the relay K2 is connected with the other end normally-closed contact, one end of the resistor R15 is connected with the positive end of the chip U3, the two ends normally-closed contact of the relay K2 is connected, the other end of the resistor R15 is connected with the ground end G3, one end of the resistor R18 is connected with one end of the resistor R21 at the negative end of the chip U4, the other end of the resistor R18 is connected with the isolating circuit U6, one end of the resistor R19 is connected with one end of the resistor R20 at the positive end of the chip U4, the other end of the resistor R19 is connected with the isolating circuit U6, the other end of the resistor R21 is connected with one end of the resistor R22 at the output end of the chip U4, the other end of the resistor R20 is connected with the ground terminal G2, the other end of the resistor R22 and one end of the capacitor C2 are connected with the output analog quantity Vsys, the other end of the capacitor C2 is connected with the ground terminal G2, a coil of the relay K1 is respectively connected with a power supply VCC and a driving unit, the other end of the driving unit is connected with a control signal VSB-, the coil of the relay K2 is respectively connected with the power supply VCC and the driving unit, and the other end of the driving unit is connected with the control signal VSB+.
The misjudgment preventing circuit comprises a resistor R23, a thermistor R24 and a relay K3, wherein one end of the resistor R23 is connected with one end of the relay K3, a control signal of the relay K3 is VK, the thermistor R24 is attached to the surface of the resistor R23, and the output analog quantity is VT.
The invention also provides a contact adhesion misjudgment and contact adhesion detection method which is applied to the contact adhesion misjudgment and contact adhesion detection circuit, and comprises the following steps:
collecting the battery voltages at the two points C and D, and recording the battery voltages as Vbat;
collecting system voltages of the points A and B, and recording the system voltages as Vsys1;
the MCUunit detects whether Vys 1 is 0, if Vys 1 is more than 0, ctylustin 2 of U5 outputs a control signal VK to enable K3 to be closed, at the moment, an external capacitor between two points A and B is discharged through R23, meanwhile, the temperature of R23 is monitored in real time through R24, VT is input to the SPlunit2 of U5, the MCUunit detects VT, VT > VTmax, VK is driven to cut off K3, and the process is repeated until Vys 1 is 0, if Vys 1 cannot drop to 0 within a set time Tmax, errors are reported, and the existence of a continuous power supply at a port is indicated;
if Vsys1 is 0;
ctlunit1 drives the VSB+ pin to be closed, voltage of two points B and C is collected and is recorded as Vsys2, SPlunit1 transmits the collected Vsys2 and Vbat to MCUunit, MCUunit to calculate difference value of the Vsys2 and the Vbat, the difference value is recorded as delta V1, delta V1< [ delta ] Vmax, and two ends of the contactors B and D are judged to be adhered;
delta V1> -Delta Vmax, OK at both ends of the contactors B and D, ctlinit 1 drives VSB+ pin to be disconnected;
ctlunit1 drives the VSB-pin to be closed, the voltages of the two points A and D are collected and marked as Vsys3, SPlunit1 transmits the Vsys2 and Vbat collected at the moment to MCUunit, MCUunit to calculate the difference value of the two points, the difference value is marked as delta V2, delta V2< [ delta ] Vmax, and then the two ends of the contactors A and C are judged to be adhered;
DeltaV 1> DeltaVmax, OK across contactors A, C, ctlinit 1 drive VSB-pin off.
The contact adhesion misjudgment and contact adhesion detection circuit and method have the beneficial effects that: the sampling circuit can be reduced, the occupied board area is reduced, the software logic strategy is simplified, the voltage difference value is accurately calculated, and misjudgment can not occur in electric shock adhesion detection.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a detection architecture circuit of the present invention.
FIG. 2 is a circuit diagram of a battery voltage sampling isolation circuit of the present invention
FIG. 3 is a circuit diagram of a battery voltage comparison circuit of the present invention
FIG. 4 is a circuit diagram of a control unit of the present invention
FIG. 5 is a circuit diagram of an erroneous judgment preventing circuit according to the present invention
Fig. 6 is a flow chart of method steps of a contact adhesion misjudgment and contact adhesion detection method of the present invention.
Detailed Description
Referring to fig. 1 to 5, the invention provides a contact adhesion misjudgment and contact adhesion detection circuit, which comprises a battery voltage sampling isolation circuit, a battery voltage comparison circuit, a detection framework circuit, a control unit and an misjudgment prevention circuit, wherein the end D and the end C of the battery voltage sampling isolation circuit are respectively connected with the end C and the end D of the detection framework circuit, the end A, the end B, the end C and the end D of the battery voltage comparison circuit are respectively communicated with the end A, the end B, the end C and the end D of the detection framework circuit corresponding to the detection framework circuit, the end A and the end B of the misjudgment prevention circuit are respectively connected with the end A and the end B corresponding to the detection framework circuit, the end Vbat of the control unit is connected with the end lead of the Vbat of the battery voltage sampling isolation circuit, the end Ctl unit1 end of the control unit is connected with the end Vbat of the battery voltage comparison circuit, the end Ctl unit Ct 1 end of the control unit is connected with the end Vbat of the battery voltage comparison circuit, and the end Vbat 2 of the control unit is connected with the end Vbat end of the control unit.
Further, the battery voltage sampling isolation circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C1, an isolation circuit U7, a chip U1, a chip U2 and an output analog quantity Vbat, one end of the resistor R1 is connected with one end of the resistor R3 at the negative end of the chip U1, the other end of the resistor R3 is connected with one end of the resistor R5 at the output end of the chip U1, the other end of the resistor R5 is communicated with the isolation circuit U7, one end of the resistor R2 is connected with one end of the resistor R4 at the positive end of the chip U1, the other end of the resistor R4 is connected with the ground end of the resistor G1, one end of the resistor R6 is connected with one end of the resistor R9 at the negative end of the chip U2, the other end of the resistor R6 is connected with the other end of the isolation circuit U7 at the other end of the resistor R2 is connected with the other end of the resistor R2 at the positive end of the resistor R2, and the other end of the resistor R2 is connected with the other end of the resistor R2 at the resistor R2 is connected with the ground end of the resistor C2.
Further, the battery voltage comparison circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a capacitor C2, an isolation circuit U6, a relay K1, a relay K2, a chip U3, a chip U4 and an output analog quantity Vsys, wherein one end of the resistor R11 is connected with one normally-closed contact of the relay K1, one end of the resistor R12 is connected with one normally-open contact of the relay K1, the other normally-closed contact of the relay K1 is connected with the other normally-closed contact, one end of the resistor R16 is connected with the negative end of the chip U3, the normally-closed contacts at two ends of the relay K1 are connected, the other end of the resistor R16 is connected with one end of the resistor R17 at the output end of the chip U3, the other end of the resistor R17 is connected with the isolation circuit U6 through wires, one end of the resistor R13 is connected with one end normally-closed contact of the relay K2, one end of the resistor R14 is connected with one end normally-open contact of the relay K2, the other end normally-open contact of the relay K2 is connected with the other end normally-closed contact, one end of the resistor R15 is connected with the positive end of the chip U3, the two ends normally-closed contact of the relay K2 is connected, the other end of the resistor R15 is connected with the ground end G3, one end of the resistor R18 is connected with one end of the resistor R21 at the negative end of the chip U4, the other end of the resistor R18 is connected with the isolating circuit U6, one end of the resistor R19 is connected with one end of the resistor R20 at the positive end of the chip U4, the other end of the resistor R19 is connected with the isolating circuit U6, the other end of the resistor R21 is connected with one end of the resistor R22 at the output end of the chip U4, the other end of the resistor R20 is connected with the ground terminal G2, the other end of the resistor R22 and one end of the capacitor C2 are connected with the output analog quantity Vsys, the other end of the capacitor C2 is connected with the ground terminal G2, a coil of the relay K1 is respectively connected with a power supply VCC and a driving unit, the other end of the driving unit is connected with a control signal VSB-, the coil of the relay K2 is respectively connected with the power supply VCC and the driving unit, and the other end of the driving unit is connected with the control signal VSB+.
Further, the erroneous judgment preventing circuit comprises a resistor R23, a thermistor R24 and a relay K3, one end of the resistor R23 is connected with one end of the relay K3, a control signal of the relay K3 is VK, the thermistor R24 is attached to the surface of the resistor R23, and the output analog quantity is VT.
Referring to fig. 6, the invention further provides a contact adhesion misjudgment and contact adhesion detection method, which is applied to the contact adhesion misjudgment and contact adhesion detection circuit, and comprises the following steps:
s1: collecting the battery voltages at the two points C and D, and recording the battery voltages as Vbat;
s2: collecting system voltages of the points A and B, and recording the system voltages as Vsys1;
s3: the MCUunit detects whether Vys 1 is 0, if Vys 1 is more than 0, ctylustin 2 of U5 outputs a control signal VK to enable K3 to be closed, at the moment, an external capacitor between two points A and B is discharged through R23, meanwhile, the temperature of R23 is monitored in real time through R24, VT is input to the SPlunit2 of U5, the MCUunit detects VT, VT > VTmax, VK is driven to cut off K3, and the process is repeated until Vys 1 is 0, if Vys 1 cannot drop to 0 within a set time Tmax, errors are reported, and the existence of a continuous power supply at a port is indicated;
s4: if Vsys1 is 0;
s5: ctlunit1 drives the VSB+ pin to be closed, voltage of two points B and C is collected and is recorded as Vsys2, SPlunit1 transmits the collected Vsys2 and Vbat to MCUunit, MCUunit to calculate difference value of the Vsys2 and the Vbat, the difference value is recorded as delta V1, delta V1< [ delta ] Vmax, and two ends of the contactors B and D are judged to be adhered;
s6: delta V1> -Delta Vmax, OK at both ends of the contactors B and D, ctlinit 1 drives VSB+ pin to be disconnected;
s7: ctlunit1 drives the VSB-pin to be closed, the voltages of the two points A and D are collected and marked as Vsys3, SPlunit1 transmits the Vsys2 and Vbat collected at the moment to MCUunit, MCUunit to calculate the difference value of the two points, the difference value is marked as delta V2, delta V2< [ delta ] Vmax, and then the two ends of the contactors A and C are judged to be adhered;
s8: deltaV 1> DeltaVmax, OK across contactors A, C, ctlinit 1 drive VSB-pin off.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (1)
1. A contact adhesion misjudgment and contact adhesion detection method is applied to a contact adhesion misjudgment and contact adhesion detection circuit, which is characterized in that,
the detection circuit comprises a battery voltage sampling isolation circuit, a battery voltage comparison circuit, a detection framework circuit, a control unit and an erroneous judgment prevention circuit, wherein the D end and the C end of the battery voltage sampling isolation circuit are respectively connected with the C end and the D end of the detection framework circuit, the A end, the B end, the C end and the D end of the battery voltage comparison circuit are respectively communicated with the A end, the B end, the C end and the D end corresponding to the detection framework circuit, the A end and the B end of the erroneous judgment prevention circuit are respectively connected with the A end and the B end corresponding to the detection framework circuit, the Vbat end of the control unit is connected with the Vbat end wire of the battery voltage sampling isolation circuit, the Vbat end of the control unit is connected with the Vbat end wire of the battery voltage comparison circuit, the Ctl unit1 end of the control unit is connected with the Vbat end wire of the battery voltage comparison circuit, the Ctl unit2 end of the control unit is connected with the K end wire of the SPbat end wire of the SPat prevention circuit, and the Vbat end of the control unit is connected with the Vbat end wire of the SPat end of the battery voltage comparison circuit;
the battery voltage sampling isolation circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C1, an isolation circuit U7, a chip U1, a chip U2 and an output analog quantity Vbat, wherein one end of the resistor R1 is connected with one end of the resistor R3 at the negative end of the chip U1, the other end of the resistor R3 is connected with one end of the resistor R5 at the output end of the chip U1, the other end of the resistor R5 is communicated with the isolation circuit U7, one end of the resistor R2 and one end of the resistor R4 are connected with the positive end of the chip U1, the other end of the resistor R4 is connected with the ground end G1, one end of the resistor R6 is connected with one end of the resistor R9 at the negative end of the chip U2, the other end of the resistor R6 is connected with the isolation circuit U7, one end of the resistor R7 is connected with one end of the other end of the resistor R8 at the chip U2 at the negative end of the chip U2, the other end of the resistor R6 is connected with the other end of the resistor R2 at the resistor C2 is connected with the other end of the resistor C2, and the other end of the resistor R2 is connected with the other end of the resistor C2 at the resistor C2 is connected with the other end of the resistor C2;
the battery voltage comparison circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a capacitor C2, an isolation circuit U6, a relay K1, a relay K2, a chip U3, a chip U4 and an output analog quantity Vsys, wherein one end of the resistor R11 is connected with a normally-closed contact at one end of the relay K1, one end of the resistor R12 is connected with a normally-closed contact at one end of the relay K1, the normally-closed contact at the other end of the relay K1 is connected with a normally-closed contact at the other end of the resistor R16, one end of the resistor R16 is connected with a negative end of the chip U3, the normally-closed contacts at two ends of the relay K1 are connected, the other end of the resistor R16 is connected with one end of the resistor R17 at the output end of the chip U3, the other end of the resistor R17 is connected with the isolation circuit U6 through a wire, one end of the resistor R13 is connected with one end normally-closed contact of the relay K2, one end of the resistor R14 is connected with one end normally-open contact of the relay K2, the other end normally-open contact of the relay K2 is connected with the other end normally-closed contact, one end of the resistor R15 is connected with the positive end of the chip U3, the two ends normally-closed contact of the relay K2 is connected, the other end of the resistor R15 is connected with the ground end G3, one end of the resistor R18 is connected with one end of the resistor R21 at the negative end of the chip U4, the other end of the resistor R18 is connected with the isolating circuit U6, one end of the resistor R19 is connected with one end of the resistor R20 at the positive end of the chip U4, the other end of the resistor R19 is connected with the isolating circuit U6, the other end of the resistor R21 is connected with one end of the resistor R22 at the output end of the chip U4, the other end of the resistor R20 is connected with the ground end G2, the other end of the resistor R22 and one end of the capacitor C2 are connected with the output analog quantity Vsys, the other end of the capacitor C2 is connected with the ground end G2, a coil of the relay K1 is respectively connected with a power supply VCC and a driving unit, the other end of the driving unit is connected with a control signal VSB-, the coil of the relay K2 is respectively connected with the power supply VCC and the driving unit, and the other end of the driving unit is connected with the control signal VSB+;
the misjudgment preventing circuit comprises a resistor R23, a thermistor R24 and a relay K3, wherein one end of the resistor R23 is connected with one end of the relay K3, a control signal of the relay K3 is VK, the thermistor R24 is attached to the surface of the resistor R23, and the output analog quantity is VT;
the detection method comprises the following steps:
collecting the battery voltages at the two points C and D, and recording the battery voltages as Vbat;
collecting system voltages of the points A and B, and recording the system voltages as Vsys1;
the MCUunit detects whether Vys 1 is 0, if Vys 1 is more than 0, ctlunit2 of the control unit U5 outputs a control signal VK to enable K3 to be closed, at the moment, the external capacitor between the points A and B is discharged through R23, meanwhile, the temperature of R23 is monitored in real time through R24, VT is input to SPLunit2 of U5, the MCUunit detects VT, VT > VTmax, VK is driven to break K3, and the operation is repeated until Vys 1 is 0, if Vys 1 cannot fall to 0 within a set time Tmax, errors are reported, and the existence of continuous power supply at a port is indicated;
if Vsys1 is 0;
ctlunit1 drives the VSB+ pin to be closed, voltage of two points B and C is collected and is recorded as Vsys2, SPlunit1 transmits the collected Vsys2 and Vbat to MCUunit, MCUunit to calculate difference value of the Vsys2 and the Vbat, the difference value is recorded as delta V1, delta V1< [ delta ] Vmax, and two ends of the contactors B and D are judged to be adhered;
delta V1> -Delta Vmax, OK at both ends of the contactors B and D, ctlinit 1 drives VSB+ pin to be disconnected;
ctlunit1 drives the VSB-pin to be closed, the voltages of the two points A and D are collected and marked as Vsys3, SPlunit1 transmits the Vsys2 and Vbat collected at the moment to MCUunit, MCUunit to calculate the difference value of the two points, the difference value is marked as delta V2, delta V2< [ delta ] Vmax, and then the two ends of the contactors A and C are judged to be adhered;
DeltaV 1> DeltaVmax, OK across contactors A, C, ctlinit 1 drive VSB-pin off.
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| CN202211696576.7A CN115963393B (en) | 2022-12-28 | 2022-12-28 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
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