CN220682148U - Relay control circuit and electric automobile - Google Patents
Relay control circuit and electric automobile Download PDFInfo
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- CN220682148U CN220682148U CN202321153527.9U CN202321153527U CN220682148U CN 220682148 U CN220682148 U CN 220682148U CN 202321153527 U CN202321153527 U CN 202321153527U CN 220682148 U CN220682148 U CN 220682148U
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- 238000003745 diagnosis Methods 0.000 claims abstract description 20
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- 238000005070 sampling Methods 0.000 claims description 30
- 238000001514 detection method Methods 0.000 claims description 18
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Abstract
The application provides a relay control circuit and electric automobile, relay control circuit includes: the high-side driving circuit, the input of high-side driving circuit is connected with first power, follows high-side driving circuit's output draws forth high-side driving pin, low-side driving circuit's output ground connection draws forth low-side driving pin from low-side driving circuit's input, first comparator, first input of first comparator is connected to first extraction point, first extraction point is connected to one of high-side driving circuit's output and low-side driving circuit's input, first threshold is received to first comparator's second input, follows the output of first comparator draws forth the drive diagnosis pin. The use of an analog-digital conversion chip is reduced, meanwhile, the data calculation of the singlechip is reduced, and the load of the singlechip is reduced.
Description
Technical Field
The application relates to the field of electric automobiles, in particular to a relay control circuit and an electric automobile.
Background
Electric vehicles are rapidly developing, and power battery packs are also rapidly developing as the most important components on electric vehicles. The power battery pack is used as a power source of the electric vehicle, and the power output control is particularly important. At present, the output control of a power source is mainly realized through a relay connected in series on a high-voltage bus of a battery pack, the relay is closed to realize the connection of the battery pack and other parts on a vehicle, and electric power is provided for the parts; the relay is disconnected to disconnect the battery pack from other parts on the vehicle and cut off the power source of the vehicle. Relays are important devices for high voltage control of vehicles. The opening and closing states of the relay are directly related to the running of the electric vehicle, so that the stability of a driving circuit of the relay directly influences the running state of the whole vehicle, and the stable execution state of the relay is a guarantee for guaranteeing the power source of the electric vehicle.
At present, the relay control mainly uses high-low side driving control and is assisted with a diagnosis circuit to ensure the use stability, but the high-low side driving voltage is an analog quantity, an analog-digital conversion chip is required to convert the analog quantity into a digital quantity, and then the single chip microcomputer is used for carrying out digital quantity logic judgment to determine the driving running state.
Disclosure of Invention
In view of the problem that the existing diagnosis of high-low side driving voltages is that the high-low side driving voltages are analog, analog-digital conversion chips are required to convert the analog into digital, and then digital logic judgment is carried out through a singlechip to determine the driving operation state, the application provides a relay control circuit and a singlechip.
In a first aspect, the present application proposes a relay control circuit comprising: the high-side driving circuit, the input of high-side driving circuit is connected with first power, follows high-side driving circuit's output draws forth high-side driving pin, low-side driving circuit's output ground connection draws forth low-side driving pin from low-side driving circuit's input, first comparator, first input of first comparator is connected to first extraction point, first extraction point is connected to one of high-side driving circuit's output and low-side driving circuit's input, first threshold is received to first comparator's second input, follows the output of first comparator draws forth the drive diagnosis pin.
Optionally, the relay control circuit further comprises a current sampling circuit, wherein the current sampling circuit is arranged between the output end of the low-side driving circuit and the ground, and a current sampling pin is led out from the output end of the current sampling circuit.
Optionally, the control end of the low-side driving circuit is connected with the control end of the high-side driving circuit to draw out a driving control pin.
Optionally, the relay control circuit further comprises a freewheel circuit, wherein a first end of the freewheel circuit is connected with the output end of the high-side driving circuit, and a second end of the freewheel circuit is connected with the input end of the low-side driving circuit.
Optionally, the relay control circuit further includes a second comparator and an or gate, wherein a first input terminal of the second comparator is connected to a second extraction point, the second extraction point is connected to the other of the output terminal of the high-side driving circuit and the input terminal of the low-side driving circuit, a second input terminal of the second comparator receives a second threshold value, an output terminal of the second comparator is connected to a first input terminal of the or gate, an output terminal of the first comparator is connected to a second input terminal of the or gate, and a driving diagnostic pin is extracted from an output terminal of the or gate.
Optionally, the current sampling circuit includes an amplifier, a filtering sub-circuit and a detection protection sub-circuit, wherein, a first input end of the amplifier is used as an input end of the current sampling circuit and is connected with an output end of the low-side driving circuit, a second input end of the amplifier is grounded, one end of the detection protection sub-circuit is connected with the first input end of the amplifier, the other end of the detection protection sub-circuit is connected with the second input end of the amplifier, a first end of the filtering sub-circuit is connected with the output end of the amplifier, a second end of the filtering sub-circuit is grounded, a third end of the filtering sub-circuit is used as the output end of the circuit sampling circuit, and a current sampling pin is led out from the third end of the filtering sub-circuit, wherein, the detection protection sub-circuit includes a first resistor, one end of the first resistor is used as one end of the detection protection sub-circuit is connected with the first input end of the amplifier, and the other end of the first resistor is used as the other end of the detection protection sub-circuit is connected with the second input end of the amplifier.
The filter sub-circuit comprises a second resistor and a first capacitor, wherein one end of the second resistor is used as a first end of the filter sub-circuit to be connected with the output end of the amplifier, the other end of the second resistor is connected with one end of the first capacitor, the other end of the first capacitor is used as a second end of the filter sub-circuit to be grounded, the other end of the second resistor is used as a third end of the filter sub-circuit, and a current sampling pin is led out from the other end of the second resistor.
Optionally, the relay control circuit further includes a threshold generating circuit, the threshold generating circuit includes a third resistor and a fourth resistor, wherein one end of the third resistor is connected with the second power supply, the other end of the third resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is grounded, a first connection point is formed between the other end of the third resistor and one end of the fourth resistor, and the first connection point outputs a first threshold.
Optionally, the high side drive circuit, the low side drive circuit and the first comparator are packaged to form a relay control chip, wherein the threshold generation circuit is integrated inside the relay control chip or the threshold generation circuit is disposed outside the relay control chip.
Optionally, the relay control circuit further includes a voltage dividing circuit, where the voltage dividing circuit includes a fifth resistor and a sixth resistor, one end of the fifth resistor is connected to the first leading-out point, the other end of the fifth resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is grounded, a second connection point is formed between the other end of the fifth resistor and one end of the fourth resistor, and the second connection point is connected to the first input end of the first comparator.
In a second aspect, the present application proposes an electric vehicle comprising: the relay is connected in series on a high-voltage bus of a battery pack of the electric automobile; the relay control circuit of any of the above claims, wherein the high-side drive pin is connected to a high-side drive end of a coil of the relay and the low-side drive pin is connected to a low-side drive end of the coil of the relay; and the drive diagnosis pin of the relay control circuit is connected to the fault diagnosis pin of the singlechip.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram one of a relay control circuit;
FIG. 2 shows a schematic diagram II of a relay control circuit;
fig. 3 shows a schematic diagram three of the relay control circuit.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, every other embodiment that a person skilled in the art would obtain without making any inventive effort is within the scope of protection of the present application.
It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the presence of the features stated hereinafter, but not to exclude the addition of other features.
The utility model relates to a relay control circuit and electric automobile, this relay control circuit can sample and judge high limit drive circuit or low limit drive circuit's voltage through first comparator, just so can be through whether high low level representation high limit drive circuit or low limit drive circuit's voltage is normal, when having reduced analog-digital conversion chip's use, reduced the data calculation of singlechip, reduced the load of singlechip.
First, application scenarios applicable to the present application will be described. The method and the device can be applied to the electric automobile.
Referring to fig. 1, fig. 1 is a schematic diagram showing a relay control circuit. As shown in fig. 1, a schematic diagram one of a relay control circuit provided in an embodiment of the present application includes: the high-side driving circuit 101, the low-side driving circuit 102, the first comparator U1, the high-side driving pin C, the low-side driving pin D, the driving control pin a, and the driving diagnosis pin B.
The input end of the high-side driving circuit 101 is connected with a first power supply, a high-side driving pin C is led out from the output end of the high-side driving circuit 101, a low-side driving circuit 102 is led out from the output end of the low-side driving circuit 102, a low-side driving pin D is led out from the input end of the low-side driving circuit 102, a first comparator U1 is arranged, the first input end of the first comparator U1 is connected to a first leading-out point, the first leading-out point is connected to one of the output end of the high-side driving circuit 101 and the input end of the low-side driving circuit 102, a second input end of the first comparator U1 receives a first threshold value, and a driving diagnosis pin B is led out from the output end of the first comparator U1. The control end of the low-side driving circuit 102 is connected with the control end of the high-side driving circuit 101 to draw out a driving control pin a.
Here, the relay control circuit is integrated into one relay control chip, and the high-side driving pin C is connected to the high-side driving end of the relay coil, and the low-side driving pin D is connected to the low-side driving end of the relay coil. The driving diagnosis pin B is connected to the fault diagnosis pin of the single-chip microcomputer, and the driving control pin A is connected to the control end of the single-chip microcomputer.
For example, the high-side driving circuit 101 and the low-side driving circuit 102 may be PMOS transistors, when the driving control pin a receives a high level, the G pole of the PMOS transistor of the high-side driving circuit 101 and the G pole of the PMOS transistor of the low-side driving circuit 102 receive a high level, the PMOS transistor of the high-side driving circuit 101 and the D pole and the S pole of the PMOS transistor of the low-side driving circuit 102 are turned on, the relay coil is turned on, and the relay switch is turned on.
Illustratively, when the first input terminal of the first comparator U1 is connected to the output terminal of the high-side driving circuit 101 through the first output point, the first input terminal of the first comparator U1 receives the output voltage of the output terminal of the high-side driving circuit 101, and the first comparator U1 compares the output voltage of the output terminal of the high-side driving circuit 101 received by the first input terminal with the first threshold received by the first input terminal, and if the voltage of the first threshold received by the second input terminal (in-phase input terminal) of the first comparator U1 is greater than the output voltage of the output terminal of the high-side driving circuit 101 received by the first input terminal (inverting input terminal) of the first comparator U1, the output terminal of the first comparator U1 outputs a high level; if the voltage of the first threshold received by the second input (non-inverting input) of the first comparator U1 is not greater than the output voltage of the output of the high-side driving circuit 101 received by the first input (inverting input) of the first comparator U1, the output of the first comparator U1 outputs a low level.
Here, the output of the first comparator U1 outputs a low level indicating that the operation state is normal, and the output of the first comparator U1 outputs a high level indicating that the operation state is abnormal.
Optionally, the relay control circuit further includes a threshold generating circuit, the threshold generating circuit includes a third resistor and a fourth resistor, wherein one end of the third resistor is connected with the second power supply, the other end of the third resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is grounded, a first connection point is formed between the other end of the third resistor and one end of the fourth resistor, and the first connection point outputs a first threshold.
The relay control circuit further comprises a voltage dividing circuit, the voltage dividing circuit comprises a fifth resistor and a sixth resistor, one end of the fifth resistor is connected with the first leading-out point, the other end of the fifth resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is grounded, a second connection point is formed between the other end of the fifth resistor and one end of the fourth resistor, and the second connection point is connected with the first input end of the first comparator.
Wherein the high side drive circuit, the low side drive circuit and the first comparator are packaged to form a relay control chip.
The threshold generating circuit is integrated inside the relay control chip, or the threshold generating circuit is arranged outside the relay control chip.
Here, if higher integration is required, the threshold generation circuit relay control chip may be internal, and if it is required to conveniently adjust the parameter, the threshold generation circuit relay control chip may be external.
For example, referring to fig. 2, fig. 2 shows a schematic diagram of a relay control circuit. As shown in fig. 2, a schematic diagram two of a relay control circuit provided in an embodiment of the present application includes: the high-side driving circuit 101, the low-side driving circuit 102, the first comparator U1, the high-side driving pin C, the low-side driving pin D, the driving control pin A, the driving diagnosis pin B, the threshold generating circuit 201 and the voltage dividing circuit 202, wherein the threshold generating circuit 201 comprises a third resistor R3 and a fourth resistor R4, and the voltage dividing circuit 202 comprises a fifth resistor R5 and a sixth resistor R6.
The connection relationship between the high-side driving circuit 101, the low-side driving circuit 102, and the first comparator U1 is the same as the connection relationship between the high-side driving circuit 101, the low-side driving circuit 102, and the first comparator U1 in fig. 1, and will not be described here again.
One end of the third resistor R3 is connected to the second power supply, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, a first connection point is formed between the other end of the third resistor R3 and one end of the fourth resistor R4, and the first connection point outputs a first threshold value.
In this way, the reasonable first threshold value can be obtained by adjusting the resistance values of the third resistor R3 and the fourth resistor R4.
One end of the fifth resistor R5 is connected with the first leading-out point, the other end of the fifth resistor R5 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, a second connection point is formed between the other end of the fifth resistor R5 and one end of the fourth resistor R4, and the second connection point is connected with the first input end of the first comparator.
In this way, the voltage to be detected can be divided by adjusting the resistance values of the fifth resistor R5 and the sixth resistor R6.
Optionally, the relay control circuit further comprises a freewheel circuit, wherein a first end of the freewheel circuit is connected with the output end of the high-side driving circuit, and a second end of the freewheel circuit is connected with the input end of the low-side driving circuit.
The relay control circuit further comprises a second comparator and an OR logic gate, wherein a first input end of the second comparator is connected to a second extraction point, the second extraction point is connected to the other one of the output end of the high-side driving circuit and the input end of the low-side driving circuit, a second input end of the second comparator receives a second threshold value, an output end of the second comparator is connected with a first input end of the OR logic gate, an output end of the first comparator is connected with a second input end of the OR logic gate, and a driving diagnosis pin is extracted from an output end of the OR logic gate.
The first threshold value is a voltage comparison value for detecting the voltage of the high-side driving circuit or the low-side driving circuit to which the first extraction point is connected, and the second threshold value is a voltage comparison value for detecting the voltage of the high-side driving circuit or the low-side driving circuit to which the second extraction point is connected.
The relay control circuit further comprises a current sampling circuit, wherein the current sampling circuit is arranged between the output end of the low-side driving circuit and the ground, and a current sampling pin is led out from the output end of the current sampling circuit.
Specifically, the current sampling circuit comprises an amplifier, a filtering sub-circuit and a detection protection sub-circuit, wherein a first input end of the amplifier is used as an input end of the current sampling circuit to be connected with an output end of the low-side driving circuit, a second input end of the amplifier is grounded, one end of the detection protection sub-circuit is connected with the first input end of the amplifier, the other end of the detection protection sub-circuit is connected with the second input end of the amplifier, the first end of the filtering sub-circuit is connected with the output end of the amplifier, the second end of the filtering sub-circuit is grounded, and a third end of the filtering sub-circuit is used as an output end of the circuit sampling circuit, and a current sampling pin is led out from the third end of the filtering sub-circuit.
The detection protection sub-circuit comprises a first resistor, wherein one end of the first resistor is used as one end of the detection protection sub-circuit to be connected with a first input end of the amplifier, and the other end of the first resistor is used as the other end of the detection protection sub-circuit to be connected with a second input end of the amplifier.
The filter sub-circuit comprises a second resistor and a first capacitor.
One end of the second resistor is used as a first end of the filter sub-circuit and is connected with the output end of the amplifier, the other end of the second resistor is connected with one end of the first capacitor, the other end of the first capacitor is used as a second end of the filter sub-circuit and is grounded, the other end of the second resistor is used as a third end of the filter sub-circuit, and a current sampling pin is led out from the other end of the second resistor.
For example, referring to fig. 3, fig. 3 shows a schematic diagram three of a relay control circuit. As shown in fig. 3, a schematic diagram of a relay control circuit provided in an embodiment of the present application includes: the high-side driving circuit 101, the low-side driving circuit 102, the first comparator U1, the second comparator U2, or the logic gate U3, the amplifier U4, the high-side driving pin C, the low-side driving pin D, the driving control pin a, the driving diagnosis pin B, the current sampling pin E, the first capacitor C1, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, and the freewheel circuit D1.
The connection relationship among the high-side driving circuit 101, the low-side driving circuit 102, the first comparator U1, the high-side driving pin C, the low-side driving pin D, the driving control pin a, the driving diagnosis pin B, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 is the same as the structure and the connection relationship among the high-side driving circuit 101, the low-side driving circuit 102, the first comparator U1, the high-side driving pin C, the low-side driving pin D, the driving control pin a, the driving diagnosis pin B, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 in fig. 2, which are not described herein.
The first input end of the amplifier U4 is used as an input end of the current sampling circuit and is connected with an output end of the low-side driving circuit 102, the second input end of the amplifier U4 is grounded, one end of the first resistor R1 is connected with the first input end of the amplifier U4, the other end of the first resistor R1 is connected with the second input end of the amplifier U4, one end of the second resistor R2 is used as a first end of the filter sub-circuit and is connected with an output end of the amplifier U4, the other end of the second resistor R2 is connected with one end of the first capacitor C1, the other end of the first capacitor C1 is used as a second end of the filter sub-circuit and is grounded, and the other end of the second resistor R2 is used as a third end of the filter sub-circuit, and a current sampling pin E is led out from the other end of the second resistor R2.
One end of the eighth resistor R8 is connected to the second power supply, the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is grounded, one end of the ninth resistor R9 is further connected to the second input end of the second comparator U2, one end of the tenth resistor R10 is connected to the first input end of the second comparator U2, the other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is grounded, and one end of the eleventh resistor R11 is further connected to the output end of the high-side driving circuit 101.
One end of a twelfth resistor R12 is connected with the output end of the second comparator U2, the other end of the twelfth resistor R12 is connected with the first input end of the OR logic gate U3, one end of a seventh resistor R7 is connected with the output end of the first comparator, the other end of the seventh resistor R7 is connected with the second input end of the OR logic gate U3, or the output end of the logic gate U3 is connected with a driving diagnosis pin.
Here, the seventh resistor R7 and the twelfth resistor R12 function as protection circuits.
For example, when the first comparator outputs a low level and the second comparator U2 also outputs a low level, or the logic gate U3 outputs a low level, the driving diagnostic pin outputs a low level at this time, which indicates that the low-side driving circuit 102 and the high-side driving circuit 101 are both operating normally; when either one of the first comparator output and the second comparator U2 outputs a high level, or the logic gate U3 outputs a high level, the driving diagnostic pin outputs a high level at this time, which indicates that there is an abnormality in the operation of the low-side driving circuit 102 and/or the high-side driving circuit 101.
Here, the freewheeling circuit D1 may be a diode, the anode of the diode is connected as the second end of the freewheeling circuit D1 to the input end of the low-side driving circuit 102, and the cathode of the diode is connected as the first end of the freewheeling circuit D1 to the output end of the high-side driving circuit 101.
The application relates to a relay control circuit and electric automobile, this application relates to a relay control circuit and electric automobile, and this relay control circuit can sample and judge high limit drive circuit or low limit drive circuit's voltage through first comparator, just so can be through whether high low level representation high limit drive circuit or low limit drive circuit's voltage is normal, when having reduced analog-to-digital conversion chip's use, reduced the data calculation of singlechip, reduced the load of singlechip.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the present application, but rather, the present application is intended to cover any variations of the equivalent structures described herein or shown in the drawings, or the direct/indirect application of the present application in other related fields.
Claims (10)
1. A relay control circuit, the relay control circuit comprising:
the input end of the high-side driving circuit is connected with a first power supply, a high-side driving pin is led out from the output end of the high-side driving circuit,
the output end of the low-side driving circuit is grounded, a low-side driving pin is led out from the input end of the low-side driving circuit,
the first input end of the first comparator is connected to a first extraction point, the first extraction point is connected to one of the output end of the high-side driving circuit and the input end of the low-side driving circuit, the second input end of the first comparator receives a first threshold value, and a driving diagnosis pin is extracted from the output end of the first comparator.
2. The relay control circuit of claim 1, further comprising a current sampling circuit,
the current sampling circuit is arranged between the output end of the low-side driving circuit and the ground, and a current sampling pin is led out from the output end of the current sampling circuit.
3. The relay control circuit of claim 1, wherein the control terminal of the low side driver circuit is connected to the control terminal of the high side driver circuit to provide a drive control pin.
4. The relay control circuit of claim 1, further comprising a freewheel circuit,
the first end of the follow current circuit is connected with the output end of the high-side driving circuit, and the second end of the follow current circuit is connected with the input end of the low-side driving circuit.
5. The relay control circuit of claim 1, further comprising a second comparator and an OR logic gate,
the first input end of the second comparator is connected to a second extraction point, the second extraction point is connected to the other one of the output end of the high-side driving circuit and the input end of the low-side driving circuit, the second input end of the second comparator receives a second threshold value, the output end of the second comparator is connected with the first input end of the OR logic gate, the output end of the first comparator is connected with the second input end of the OR logic gate, and a driving diagnosis pin is extracted from the output end of the OR logic gate.
6. The relay control circuit of claim 2, wherein the current sampling circuit comprises an amplifier, a filtering sub-circuit, and a detection protection sub-circuit,
wherein the first input end of the amplifier is used as the input end of the current sampling circuit to be connected with the output end of the low-side driving circuit, the second input end of the amplifier is grounded, one end of the detection protection sub-circuit is connected with the first input end of the amplifier, the other end of the detection protection sub-circuit is connected with the second input end of the amplifier, the first end of the filter sub-circuit is connected with the output end of the amplifier, the second end of the filter sub-circuit is grounded, the third end of the filter sub-circuit is used as the output end of the current sampling circuit, a current sampling pin is led out from the third end of the filter sub-circuit,
wherein the detection protection sub-circuit comprises a first resistor,
wherein one end of the first resistor is used as one end of the detection protection sub-circuit to be connected with a first input end of the amplifier, the other end of the first resistor is used as the other end of the detection protection sub-circuit to be connected with a second input end of the amplifier,
wherein the filter sub-circuit comprises a second resistor and a first capacitor,
one end of the second resistor is used as a first end of the filter sub-circuit and is connected with the output end of the amplifier, the other end of the second resistor is connected with one end of the first capacitor, the other end of the first capacitor is used as a second end of the filter sub-circuit and is grounded, the other end of the second resistor is used as a third end of the filter sub-circuit, and a current sampling pin is led out from the other end of the second resistor.
7. The relay control circuit of claim 1, further comprising a threshold generation circuit comprising a third resistor and a fourth resistor,
one end of the third resistor is connected with a second power supply, the other end of the third resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is grounded, a first connection point is formed between the other end of the third resistor and one end of the fourth resistor, and the first connection point outputs a first threshold value.
8. The relay control circuit of claim 7, wherein the high side drive circuit, the low side drive circuit, and the first comparator are packaged to form a relay control chip,
the threshold generating circuit is integrated inside the relay control chip, or the threshold generating circuit is arranged outside the relay control chip.
9. The relay control circuit of claim 7, further comprising a voltage divider circuit comprising a fifth resistor and a sixth resistor,
one end of the fifth resistor is connected with the first leading-out point, the other end of the fifth resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is grounded, a second connection point is formed between the other end of the fifth resistor and one end of the fourth resistor, and the second connection point is connected with the first input end of the first comparator.
10. An electric automobile, characterized in that it comprises:
the relay is connected in series on a high-voltage bus of a battery pack of the electric automobile;
the relay control circuit of any of claims 1-9, wherein the high-side drive pin is connected to a high-side drive end of a coil of a relay and the low-side drive pin is connected to a low-side drive end of the coil of the relay;
and the drive diagnosis pin of the relay control circuit is connected to the fault diagnosis pin of the singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321153527.9U CN220682148U (en) | 2023-05-12 | 2023-05-12 | Relay control circuit and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321153527.9U CN220682148U (en) | 2023-05-12 | 2023-05-12 | Relay control circuit and electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220682148U true CN220682148U (en) | 2024-03-29 |
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| CN202321153527.9U Active CN220682148U (en) | 2023-05-12 | 2023-05-12 | Relay control circuit and electric automobile |
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