CN115963393A - 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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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 method. The setting of above circuit can reduce sampling circuit, reduces and occupies the board area, simplifies the software logic strategy, and the accurate calculation of voltage difference can not take place the erroneous judgement in the adhesion detection of electrocution.
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 board through a sampling harness. The BMS of battery gathers the voltage of every tie point, when not closed through the contactor, compares the voltage of each tie point, judges whether the contactor adheres.
However, in the prior art, each point of the contactor needs one sampling circuit, the number of circuits is large, the occupied board area is large, the number of the AD ports of the MCU is large, the logic strategy on software is complicated, the contact adhesion detection is misjudged, and the voltage difference value is not accurately calculated.
Disclosure of Invention
The invention aims to provide a contact adhesion misjudgment and contact adhesion detection circuit and a contact adhesion detection method, and aims to solve the technical problems that each point of a contactor in the prior art needs one sampling circuit, the circuits are more, the occupied board area is large, the AD ports of an MCU are more used, the logic strategy on software is more complicated, the contact adhesion detection misjudgment is carried out, and the voltage difference calculation is inaccurate.
In order to achieve the above object, the present 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 frame circuit, a control unit and an anti-misjudgment circuit, wherein a D terminal and a C terminal of the battery voltage sampling isolation circuit are respectively connected to a C terminal and a D terminal of the detection frame circuit, an a terminal, a B terminal, a C terminal and a D terminal of the battery voltage comparison circuit are respectively connected to an a terminal, a B terminal, a C terminal and a D terminal corresponding to the detection frame circuit, an a terminal and a B terminal of the anti-misjudgment circuit are respectively connected to an a terminal and a B terminal corresponding to the detection frame circuit, a Vbat terminal of the control unit is connected to a Vbat terminal of the battery voltage sampling isolation circuit, a Vsys terminal of the control unit is connected to a Vsys terminal of the battery voltage comparison circuit, a Ctl unit1 terminal of the control unit is connected to a VSB-terminal and a Vbat + terminal of the battery voltage comparison circuit, a VSB unit of the control unit is connected to a VSB nit2 terminal of the control unit, and an anti-misjudgment circuit is connected to a vbnit terminal of the battery voltage comparison circuit, and an anti-misjudgment 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 value Vbat, wherein one end of the resistor R1 and one end of the resistor R3 are connected to the negative end of the chip U1, the other end of the resistor R3 and one end of the resistor R5 are connected to 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 to the positive end of the chip U1, the other end of the resistor R4 is connected to the ground end G1, one end of the resistor R6 and one end of the resistor R9 are connected to the negative end of the chip U2, the other end of the resistor R6 is connected to the isolation circuit U7, one end of the resistor R8 and one end of the resistor R2 are connected to the positive end of the output end of the chip U2, and the other end of the resistor R7 are connected to the output end of the capacitor R2, and the output end of the resistor R2 are connected to the output end of the capacitor R2, and the output analog value Vbat of the output end of the resistor R10 is connected to the output end of the resistor R2 of the capacitor R7 of the resistor R2, and the output end of the capacitor R2 of the resistor R7 of the capacitor R2.
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 end normally closed contact of the relay K1, one end of the resistor R12 is connected with one end normally open contact of the relay K1, the other end normally open contact of the relay K1 is connected with the normally closed contact of the other end and is connected with one end of the resistor R16 at 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, and 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 a normally closed contact at one end of the relay K2, one end of the resistor R14 is connected with a normally open contact at one end of the relay K2, a normally open contact at the other end of the relay K2 is connected with a normally closed contact at the other end, and one end of the resistor R15 is connected with the positive end of the chip U3, normally closed contacts at two ends of the relay K2 are connected, the other end of the resistor R15 is connected with the grounding terminal G3, one end of the resistor R18 and one end of the resistor R21 are connected with the negative end of the chip U4, the other end of the resistor R18 is connected with the isolation circuit U6, one end of the resistor R19 and one end of the resistor R20 are connected with the positive end of the chip U4, the other end of the resistor R19 is connected with the isolation circuit U6, and the other end of the resistor R21 and one end of the resistor R22 are connected with the output end of the chip U4, the other end of the resistor R20 is connected with a grounding 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 grounding 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-, a 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, 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 of the 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;
MCUunit detects whether Vsys1 is 0, if Vsys1 is greater than 0, ctlunint 2 of U5 outputs a control signal VK to close K3, at the moment, external capacitance 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, MCUunit detects VT, VT is greater than VTmax, VK is driven to be disconnected with K3, the steps are repeated until Vsys1 is 0, if Vsys1 cannot be reduced to 0 within set time Tmax, an error is reported, and the situation that a source power supply exists at a port continuously is indicated;
if Vsys1 is 0;
ctlunint 1 drives a VSB + pin to be closed, the voltages of the points B and C are collected and recorded as Vsys2, the SPLunit1 transmits the collected Vsys2 and Vbat to MCUunit, the MCUunit calculates the difference value between the two points and records as delta V1 and delta V1< deltaVmax, and then the two ends of the contactors B and D are judged to be adhered;
delta V1> delta Vmax, two ends OK of the contactors B and D, ctlurnit 1 drives the VSB + pin to be disconnected;
ctlunint 1 drives a VSB-pin to be closed, the voltages of the points A and D are collected and recorded as Vsys3, the collected Vsys2 and Vbat are transmitted to MCUunit by the SPLunit1, the difference value of the two points A and D is calculated by the MCUunit and recorded as delta V2, and the delta V2< deltaVmax, and then the two ends of the contactors A and C are judged to be adhered;
delta V1> Delta Vmax, OK is arranged at two ends of the contactors A and C, ctlurnit 1 drives the VSB-pin to be disconnected.
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 the electric shock adhesion detection cannot be misjudged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of the 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 the anti-misjudgment circuit of 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 present invention provides a contact adhesion misjudgment and contact adhesion detection circuit, including a battery voltage sampling isolation circuit, a battery voltage comparison circuit, a detection frame circuit, a control unit and an anti-misjudgment circuit, wherein a terminal D and a terminal C of the battery voltage sampling isolation circuit are connected to a terminal C and a terminal D of the detection frame circuit respectively, a terminal a, a terminal B, a terminal C and a terminal D of the battery voltage comparison circuit are connected to a terminal a, a terminal B, a terminal C and a terminal D corresponding to the detection frame circuit respectively, a terminal a and a terminal B of the anti-misjudgment circuit are connected to a terminal a and a terminal B corresponding to the detection frame circuit respectively, a terminal Vbat of the control unit is connected to a terminal Vbat of the battery voltage sampling isolation circuit, a terminal Vsys of the control unit is connected to a terminal Vsys of the battery voltage comparison circuit, a terminal ct 1 of the control unit is connected to terminals Vbat-and VSB + of the battery voltage comparison circuit, a terminal lut 2 of the control unit is connected to a terminal Vsys of the battery voltage comparison circuit, and a terminal vsnit of the anti-misjudgment circuit is connected to a terminal vsnit of the battery voltage comparison circuit, and an anti-misjudgment circuit is connected to a terminal vsnit 2 of the anti-misjudgment circuit.
Further, the battery voltage sampling isolation circuit includes 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 value Vbat, wherein one end of the resistor R1 and one end of the resistor R3 are connected to the negative terminal of the chip U1, the other end of the resistor R3 and one end of the resistor R5 are connected to the output terminal 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 to the positive terminal of the chip U1, the other end of the resistor R4 is connected to the ground terminal G1, one end of the resistor R6 and one end of the resistor R9 are connected to the negative terminal of the chip U2, the other end of the resistor R6 is connected to the isolation circuit U7, one end of the resistor R8 and one end of the resistor R2 is connected to the output terminal of the chip U2, and the other end of the resistor R7 is connected to the output analog value Vbat the output terminal of the capacitor R10, and one end of the resistor R2 is connected to the output terminal of the resistor R2.
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 a normally closed contact at one end of the relay K1, one end of the resistor R12 is connected with a normally open contact at one end of the relay K1, a normally open contact at the other end of the relay K1 is connected with a normally closed contact at the other end and one end of the resistor R16 is connected with the negative electrode end of the chip U3, 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, and 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 a normally closed contact at one end of the relay K2, one end of the resistor R14 is connected with a normally open contact at one end of the relay K2, a normally open contact at the other end of the relay K2 is connected with a normally closed contact at the other end, and one end of the resistor R15 is connected with the positive end of the chip U3, normally closed contacts at two ends of the relay K2 are connected, the other end of the resistor R15 is connected with the grounding end G3, one end of the resistor R18 and one end of the resistor R21 are connected with the negative end of the chip U4, the other end of the resistor R18 is connected with the isolation circuit U6, one end of the resistor R19 and one end of the resistor R20 are connected with the positive end of the chip U4, the other end of the resistor R19 is connected with the isolation circuit U6, and the other end of the resistor R21 and one end of the resistor R22 are connected with the output end of the chip U4, the other end of the resistor R20 is connected with a grounding terminal G2, the other end of the resistor R22 is connected with one end of the capacitor C2 and is connected with the output analog quantity Vsys, the other end of the capacitor C2 is connected with the grounding terminal G2, the 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 false-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 present invention further provides a method for determining a contact adhesion error and detecting a contact adhesion, which is applied to the circuit for determining a contact adhesion error and detecting a contact adhesion, and includes the following steps:
s1: collecting the battery voltages of the 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: MCUunit detects whether Vsys1 is 0, if Vsys1 is greater than 0, ctlunint 2 of U5 outputs a control signal VK to close K3, at the moment, external capacitance 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, MCUunit detects VT, VT is greater than VTmax, VK is driven to be disconnected with K3, the steps are repeated until Vsys1 is 0, if Vsys1 cannot be reduced to 0 within set time Tmax, an error is reported, and the situation that a source power supply exists at a port continuously is indicated;
s4: if Vsys1 is 0;
s5: ctlunint 1 drives a VSB + pin to be closed, the voltages of two points B and C are collected and recorded as Vsys2, the collected Vsys2 and Vbat are transmitted to MCUunit by the SPLunit1, the difference value of the two points is calculated by the MCUunit and recorded as delta V1, and the delta V1< deltaVmax, and then the two ends of the contactors B and D are judged to be adhered;
s6: delta V1> deltaVmax, two ends OK of the contactors B and D, ctlurnit 1 drives VSB + pin to be disconnected;
s7: ctlunint 1 drives a VSB-pin to be closed, the voltages of the points A and D are collected and recorded as Vsys3, the collected Vsys2 and Vbat are transmitted to MCUunit by the SPLunit1, the difference value of the two points A and D is calculated by the MCUunit and recorded as delta V2, and the delta V2< deltaVmax, and then the two ends of the contactors A and C are judged to be adhered;
s8: delta V1> deltaVmax, two ends OK of the contactors A and C, ctlurnit 1 drives VSB-pin to be disconnected.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A contact adhesion misjudgment and contact adhesion detection circuit is characterized in that,
the direct current detection circuit comprises a battery voltage sampling isolation circuit, a battery voltage comparison circuit, a detection framework circuit, a control unit and an anti-misjudgment 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 anti-misjudgment 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 a Vbat end lead of the battery voltage sampling isolation circuit, the Vsys end of the control unit is connected with a Vsys end lead of the battery voltage comparison circuit, the Ctlunint 1 end of the control unit is connected with a VSB-end and a VSB + end lead of the battery voltage comparison circuit, the Ctlunt 2 end of the control unit is connected with a Vbat end lead of the anti-misjudgment circuit, and the SPnit end of the battery voltage comparison circuit are connected with the Vbat end of the anti-misjudgment circuit, and the SPnit 2 lead of the battery voltage comparison circuit.
2. The contact adhesion misjudgment and contact adhesion detection circuit according to claim 1,
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 and one end of the resistor R3 are connected with the negative end of the chip U1, the other end of the resistor R3 and one end of the resistor R5 are connected with 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 grounding end G1, one end of the resistor R6 and one end of the resistor R9 are connected to the negative end of the chip U2, the other end of the resistor R6 is connected to the isolation circuit U7, one end of the resistor R7 and one end of the resistor R8 are connected to the positive end of the chip U2, the other end of the resistor R7 is connected to the isolation circuit U7, the other end of the resistor R9 and one end of the resistor R10 are connected to the output end of the chip U2, the other end of the resistor R8 is connected to the ground terminal G2, the other end of the resistor R10 and one end of the capacitor C1 are connected to the output analog value Vbat, and the other end of the capacitor C1 is connected to the ground terminal G2.
3. The contact sticking misjudgment and contact sticking detection circuit according to claim 2,
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 normally open contact of the other end of the relay K1 is connected with the normally closed contact of the other end of the relay K1 and one end of the resistor R16 is connected with the negative end of the chip U3, the normally closed contacts of the two ends of the relay K1, the other end of the resistor R16 is connected with one end of the resistor R17 at the output end of the chip U3, and 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 a normally closed contact at one end of the relay K2, one end of the resistor R14 is connected with a normally open contact at one end of the relay K2, a normally open contact at the other end of the relay K2 is connected with a normally closed contact at the other end, and one end of the resistor R15 is connected with the positive end of the chip U3, normally closed contacts at two ends of the relay K2 are connected, the other end of the resistor R15 is connected with the grounding end G3, one end of the resistor R18 and one end of the resistor R21 are connected with the negative end of the chip U4, the other end of the resistor R18 is connected with the isolation circuit U6, one end of the resistor R19 and one end of the resistor R20 are connected with the positive end of the chip U4, the other end of the resistor R19 is connected with the isolation circuit U6, and the other end of the resistor R21 and one end of the resistor R22 are connected with the output end of the chip U4, the other end of the resistor R20 is connected with a grounding terminal G2, the other end of the resistor R22 is connected with one end of the capacitor C2 and is connected with the output analog quantity Vsys, the other end of the capacitor C2 is connected with the grounding terminal G2, the 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 +.
4. The contact adhesion misjudgment and contact adhesion detection circuit according to claim 3,
the anti-misjudgment 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.
5. A contact adhesion misjudgment and contact adhesion detection method applied to the contact adhesion misjudgment and contact adhesion detection circuit according to claim 4, characterized by comprising the steps of:
collecting the battery voltages of the 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;
MCUunit detects whether Vsys1 is 0, if Vsys1 is greater than 0, ctlunint 2 of U5 outputs a control signal VK to close K3, at the moment, external capacitance 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, MCUunit detects VT, VT is greater than VTmax, VK is driven to be disconnected with K3, the steps are repeated until Vsys1 is 0, if Vsys1 cannot be reduced to 0 within set time Tmax, an error is reported, and the situation that a source power supply exists at a port continuously is indicated;
if Vsys1 is 0;
ctlunint 1 drives a VSB + pin to be closed, the voltages of the points B and C are collected and recorded as Vsys2, the SPLunit1 transmits the collected Vsys2 and Vbat to MCUunit, the MCUunit calculates the difference value between the two points and records as delta V1 and delta V1< deltaVmax, and then the two ends of the contactors B and D are judged to be adhered;
delta V1> delta Vmax, two ends OK of the contactors B and D, ctlurnit 1 drives the VSB + pin to be disconnected;
ctlunint 1 drives a VSB-pin to be closed, the voltages of the points A and D are collected and recorded as Vsys3, the SPLunit1 transmits the collected Vsys2 and Vbat to MCUunit, the MCUunit calculates the difference value between the VSys2 and the Vbat and records as delta V2 and delta V2< deltaVmax, and then the two ends of the contactors A and C are judged to be adhered;
delta V1> Delta Vmax, OK is arranged at two ends of the contactors A and C, ctlurnit 1 drives the VSB-pin to be disconnected.
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