CN214669449U - Interface protection circuit, gun insertion detection circuit, electric vehicle control circuit and vehicle - Google Patents
Interface protection circuit, gun insertion detection circuit, electric vehicle control circuit and vehicle Download PDFInfo
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- CN214669449U CN214669449U CN202120547173.0U CN202120547173U CN214669449U CN 214669449 U CN214669449 U CN 214669449U CN 202120547173 U CN202120547173 U CN 202120547173U CN 214669449 U CN214669449 U CN 214669449U
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Abstract
The utility model provides an interface protection circuit, rifle detection circuitry, electric vehicle control circuit and vehicle insert relates to protection circuit's technical field, the utility model provides an interface protection circuit includes: the power supply protection circuit comprises a pull-up resistor, a switch control circuit and a first switch tube, wherein the switch control circuit can control the on-off of the first switch tube based on the size of the input end access voltage, and when the voltage of the input end is larger than the first voltage, the first switch tube is controlled to be disconnected, so that the functions of preventing the power supply from flowing backwards and protecting the overvoltage are realized. Because the on-resistance of switch tube is enough little, consequently, the utility model provides an interface protection circuit can treat the power supply who protects the interface and effectively protect under the prerequisite that does not influence resistance detection precision to alleviate the technical problem that the interface protection circuit among the prior art exists and lead to equipment state testing result accuracy low.
Description
Technical Field
The utility model belongs to the technical field of the technique of protection circuit and specifically relates to a interface protection circuit, insert rifle detection circuitry, electric vehicle control circuit and vehicle are related to.
Background
The environmental conditions and tests (ISO16750-2) of road vehicles-electrical and electronic equipment have proposed a detection standard for Short circuit tests (Short circuit protection) of the relevant interfaces in the vehicle hardware circuit, and when a certain voltage is applied at the interface according to the test requirements, preset abnormal conditions, such as power failure, reset and the like, cannot occur in the functions of the product. Fig. 1 shows an interface protection circuit in the prior art, as shown in fig. 1, a diode is connected in series on a power circuit, that is, designed as a unidirectional conducting circuit, so as to prevent the power from flowing backwards during a short circuit test. However, for an interface in which the load equivalent model is a resistor, the interface detects the state of the device based on the resistance value, and since a diode (the current-voltage characteristic of the diode is nonlinear) is connected in series in the circuit, the accuracy of the detection of the resistor is affected, and the accuracy of the detection of the state of the device is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an interface protection circuit, rifle detection circuitry, electric vehicle control circuit and vehicle insert to alleviate the technical problem that the equipment status testing result accuracy that leads to that interface protection circuit among the prior art exists is low.
In a first aspect, the present invention provides an interface protection circuit, including: the pull-up resistor, the switch control circuit and the first switching tube are connected in series; the first end of the pull-up resistor is connected with the interface to be protected, and the second end of the pull-up resistor is respectively connected with the input end of the switch control circuit and the first end of the first switch tube; the output end of the switch control circuit is connected with the second end of the first switch tube; the third end of the first switch tube is connected with a power supply of the interface to be protected; the switch control circuit is used for outputting a first level signal to the first switch tube when detecting that the voltage of the input end of the switch control circuit is not more than a first voltage so as to enable the first switch tube to be conducted; wherein the first voltage is greater than a voltage of the power supply; the switch control circuit is further used for outputting a second level signal to the first switch tube when detecting that the voltage of the input end of the switch control circuit is greater than the first voltage, so that the first switch tube is disconnected.
In an alternative embodiment, the switch control circuit includes: the circuit comprises a sub-switch circuit, a voltage stabilizing diode and a first resistor; the first end of the sub-switch circuit is connected with the input end of the switch control circuit, the second end of the sub-switch circuit is connected with the cathode of the voltage stabilizing diode, and the third end of the sub-switch circuit is respectively connected with the first end of the first resistor and the output end of the switch control circuit; the anode of the voltage stabilizing diode and the second end of the first resistor are connected with a grounding end; under the condition that the voltage of the first end of the sub-switch circuit is not larger than the first voltage, the sub-switch circuit is switched off, so that the third end of the sub-switch circuit outputs the first level signal; and when the voltage of the first end of the sub-switch circuit is greater than the first voltage, the sub-switch circuit is conducted, so that the third end of the sub-switch circuit outputs the second level signal.
In an alternative embodiment, the sub-switching circuit comprises: the second switch tube, the second resistor and the third resistor; the first end of the second switch tube is respectively connected with the first end of the sub-switch circuit and the first end of the second resistor, and the second end of the second switch tube is respectively connected with the second end of the second resistor and the first end of the third resistor; the second end of the third resistor is connected with the second end of the sub-switch circuit; the third end of the second switch tube is connected with the third end of the sub-switch circuit; under the condition that the voltage of the first end of the second switch tube is not larger than the first voltage, the second switch tube is switched off; and under the condition that the voltage of the first end of the second switching tube is greater than the first voltage, the second switching tube is conducted.
In an alternative embodiment, the breakdown voltage of the zener diode is greater than the voltage of the power supply.
In an alternative embodiment, the first switching tube includes: a P-channel MOSFET.
In an alternative embodiment, the second switching tube includes: PNP type triode.
In an optional embodiment, the interface to be protected includes: an electric vehicle charging gun detection interface.
In a second aspect, the present invention provides a lance detection circuit, the lance detection circuit includes any one of the above-mentioned preceding embodiments the interface protection circuit, further including: the fourth resistor, the fifth resistor, the sixth resistor and the access switch; a first end of the fourth resistor is connected with a port to be protected and a first end of the fifth resistor respectively, and a second end of the fifth resistor is connected with a first end of the sixth resistor and a first end of the access switch respectively; and the second end of the fourth resistor, the second end of the sixth resistor and the second end of the access switch are connected with a ground terminal.
In a third aspect, the present invention provides an electric vehicle control circuit, which includes the interface protection circuit of the foregoing embodiment.
In a fourth aspect, the present invention provides a vehicle to which the electric vehicle control circuit according to the foregoing embodiment is applied.
The utility model provides an interface protection circuit, include: the pull-up resistor, the switch control circuit and the first switching tube are connected in series; the first end of the pull-up resistor is connected with the interface to be protected, and the second end of the pull-up resistor is respectively connected with the input end of the switch control circuit and the first end of the first switch tube; the output end of the switch control circuit is connected with the second end of the first switch tube; the third end of the first switch tube is connected with a power supply of the interface to be protected; the switch control circuit is used for outputting a first level signal to the first switch tube when detecting that the voltage of the input end of the switch control circuit is not more than a first voltage so as to enable the first switch tube to be conducted; wherein the first voltage is not greater than the voltage of the power supply; the switch control circuit is also used for outputting a second level signal to the first switch tube when detecting that the voltage of the input end of the switch control circuit is greater than the first voltage so as to disconnect the first switch tube.
In the interface protection circuit in the prior art, a unidirectional conduction circuit is manufactured by connecting diodes in series in the circuit to prevent the power supply from flowing backwards, and if the interface protection circuit is applied to an interface with a load equivalent model as a resistor, the precision of resistor detection can be influenced, and the accuracy of equipment state detection is reduced. Compared with the prior art, the utility model provides an interface protection circuit, include: the power supply protection circuit comprises a pull-up resistor, a switch control circuit and a first switch tube, wherein the switch control circuit can control the on-off of the first switch tube based on the size of the input end access voltage, and when the voltage of the input end is larger than the first voltage, the first switch tube is controlled to be disconnected, so that the functions of preventing the power supply from flowing backwards and protecting the overvoltage are realized. Because the on-resistance of switch tube is enough little, consequently, the utility model provides an interface protection circuit can treat the power supply who protects the interface and effectively protect under the prerequisite that does not influence resistance detection precision to alleviate the technical problem that the interface protection circuit among the prior art exists and lead to equipment state testing result accuracy low.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a prior art interface protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an interface protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an alternative interface protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another alternative interface protection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a lance detection circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another electric vehicle charging gun detection interface circuit connection according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as 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 invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
In order to improve the stability of the circuit and avoid malfunction, some detection interfaces often need to be in a stable level state by using a pull-up resistor during circuit design. In order to test the reliability of a product, a short circuit test is often performed on part of the detection interfaces, that is, an external voltage is connected to the interface, and a preset abnormal condition cannot occur in the function of the product (the preset abnormal condition needs to be set correspondingly according to different safety level requirements).
In the prior art, in order to prevent the product function abnormality caused by the backflow of the external voltage during the short circuit test, an interface protection circuit shown in fig. 1 is often adopted, and the circuit can achieve the purpose of preventing the backflow of the power supply due to the unidirectional conduction function of the diode, but for an interface in which the load equivalent model is a resistor, due to the nonlinearity of the volt-ampere characteristic of the diode, when the diode is conducted, the equivalent resistance value of the diode can affect the resistance detection precision of the interface, and therefore, the accuracy of the device state detection can be reduced for the interface which detects the device state based on the resistance value. In view of the above, embodiments of the present invention provide an interface protection circuit to alleviate the above-mentioned technical problems.
Example one
Fig. 2 is a schematic structural diagram of an interface protection circuit provided by an embodiment of the present invention, as shown in fig. 2, the interface protection circuit includes: pull-up resistor RX, switch control circuit 10 and first switching tube Q1.
A first end of the pull-up resistor RX is connected to the interface to be protected, and a second end of the pull-up resistor RX is respectively connected to the input end of the switch control circuit 10 and the first end of the first switch tube Q1; the output end of the switch control circuit 10 is connected to the second end of the first switch tube Q1; the third terminal of the first switching tube Q1 is connected to the power supply VDC of the interface to be protected.
The switch control circuit 10 is configured to output a first level signal to the first switch Q1 when detecting that the voltage at the input terminal thereof is not greater than the first voltage, so as to turn on the first switch Q1; wherein the first voltage is greater than the voltage of the power supply VDC.
The switch control circuit 10 is further configured to output a second level signal to the first switch Q1 to turn off the first switch Q1 when detecting that the voltage at the input terminal thereof is greater than the first voltage.
Specifically, the embodiment of the utility model provides an interface protection circuit includes pull-up resistance RX, on-off control circuit 10 and first switch tube Q1, can know according to the circuit connection relation that has described in the foregoing, if want to treat the power supply VDC of protecting the interface and protect, prevent that the external power that the kneck inserts from flowing backward and arousing product function abnormity, the node voltage of the second end of pull-up resistance RX is detected to usable on-off control circuit 10's input, if this node voltage exceeds first voltage, then usable on-off control circuit 10 controls first switch tube Q1 and closes, and then can reach the purpose that prevents the power and flow backward. If the node voltage is not greater than the first voltage, and it is determined that there is no risk of power backflow, the switch control circuit 10 may be used to control the first switch transistor Q1 to be turned on.
The embodiment of the utility model provides an in, when treating that protection kneck does not insert external power source, first switch tube Q1 should be in the on-state, because the switch tube switch-on voltage drop only with on-resistance RDSONAnd the current flowing through has a relationship of RDSONThe voltage drop of the two ends of the pull-up resistor RX is generally about 10m Ω, and is generally much less than 0.7V (the conduction voltage drop of a common diode is 0.7V), so that the voltage of the second end of the pull-up resistor RX is less than the voltage of the power supply VDC at this time; when the external power supply is connected to the interface to be protected, in order to prevent the power supply from flowing backwards, if the voltage at the second end of the pull-up resistor RX is greater than the voltage of the power supply VDC, the first switching tube Q1 should be in an off state. Consequently, the value that sets up first voltage is greater than the above-mentioned power supply VDC who treats the protection interface and can satisfy the break-make condition of above-mentioned first switch tube Q1, the utility model discloses do not prescribe a limit to the value of first voltage, the user need carry out concrete setting according to circuit actual conditions, as long as can regard as the detection threshold value that prevents flowing backward can.
As can be seen from the foregoing description, when the switch control circuit 10 detects that the voltage at its input terminal is not greater than the first voltage, and determines that there is no risk of power source flowing backwards, it may output a first level signal to the first switch Q1, so as to turn on the first switch Q1; on the contrary, when the switch control circuit 10 detects that the voltage at the input terminal thereof is greater than the first voltage, and determines that there is a risk of power source backflow at this time, it may output a second level signal to the first switch tube Q1, so as to turn off the first switch tube Q1. The concrete level value of above-mentioned first level signal and second level signal can carry out the adaptability according to the concrete type of first switch tube Q1 and set for, the utility model discloses do not carry out concrete the injecing to its value, as long as switch control circuit 10 and first switch tube Q1 can realize corresponding break-make function according to above-mentioned control logic can.
In the interface protection circuit in the prior art, a unidirectional conduction circuit is manufactured by connecting diodes in series in the circuit to prevent the power supply from flowing backwards, and if the interface protection circuit is applied to an interface with a load equivalent model as a resistor, the precision of resistor detection can be influenced, and the accuracy of equipment state detection is reduced. Compared with the prior art, the utility model provides an interface protection circuit, include: the pull-up resistor RX, the switch control circuit 10 and the first switch tube Q1, the switch control circuit 10 can control the on-off of the first switch tube Q1 based on the magnitude of the input voltage of the input end, and when the voltage of the input end is greater than the first voltage, the first switch tube Q1 is controlled to be disconnected, so that the functions of preventing power supply backflow and overvoltage protection are realized. Because the on-resistance of switch tube is enough little, consequently, the utility model provides an interface protection circuit can treat the power supply VDC of protection interface and effectively protect under the prerequisite that does not influence resistance detection precision to alleviate the technical problem that the interface protection circuit among the prior art exists and lead to equipment state testing result accuracy low.
It is right in the foregoing that the embodiment of the present invention provides an interface protection circuit whose composition structure is described, and it can be known from the description above that the switch control circuit 10 is a circuit outputting different level signals based on different voltage values of its input terminal, and this circuit structure can be set up according to the actual requirement of the user, the present invention does not limit the specific structure of the switch control circuit 10. An alternative embodiment of the switch control circuit 10 is described in detail below.
In an alternative embodiment, as shown in fig. 3, the switch control circuit 10 includes: a sub-switch circuit 101, a zener diode DX1 and a first resistor R1.
The first end of the sub-switch circuit 101 is connected with the input end of the switch control circuit 10, the second end of the sub-switch circuit 101 is connected with the cathode of the zener diode DX1, and the third end of the sub-switch circuit 101 is respectively connected with the first end of the first resistor R1 and the output end of the switch control circuit 10; an anode of the zener diode DX1 and a second terminal of the first resistor R1 are connected to the ground GND.
In the case that the voltage of the first terminal of the sub-switch circuit 101 is not greater than the first voltage, the sub-switch circuit 101 is turned off so that the third terminal of the sub-switch circuit 101 outputs the first level signal.
When the voltage of the first terminal of the sub-switch circuit 101 is greater than the first voltage, the sub-switch circuit 101 is turned on, so that the third terminal of the sub-switch circuit 101 outputs the second level signal.
In the embodiment of the present invention, the switch control circuit 10 includes the sub-switch circuit 101, the zener diode DX1 and the first resistor R1, and as can be seen from the above-described circuit connection relationship, the switch control circuit 10 utilizes the characteristic of the zener diode DX1 to output signals of different levels based on different input voltages.
Specifically, in the embodiment of the present invention, the breakdown voltage of the zener diode DX1 is equal to the first voltage, and therefore, when the voltage received by the first end of the sub-switch circuit 101 is not greater than the first voltage, the zener diode DX1 is not broken down, and there is only a small leakage current (uA level) in the circuit, at this time, the sub-switch circuit 101 is in the off state, and further the output end of the switch control circuit 10 can only be grounded through the first resistor R1, that is, the output end of the switch control circuit 10 outputs the low level, which is equivalent to that the first level signal in the above is the low level.
If the voltage of the first end of the sub-switch circuit 101 is greater than the first voltage, and the voltage accessed by the current sub-switch circuit 101 causes the breakdown of the zener diode DX1, at this moment, the sub-switch circuit 101 is in the conducting state, the voltage drop generated by the conduction of the sub-switch circuit 101 is subtracted from the voltage of the input end of the switch control circuit 10, in the embodiment of the present invention, the voltage drop generated by the conduction of the sub-switch circuit 101 is equal to the conduction voltage drop of the switch tube, and it can be known from the above description that the voltage of the first end of the sub-switch circuit 101 is subtracted from the conduction voltage drop of the sub-switch circuit 101 by the second level signal, therefore, there is a certain mathematical relationship between the specific value of the second level signal and the voltage of the input end of the sub-switch circuit 101.
In an alternative embodiment, as shown in fig. 4, the sub-switch circuit 101 includes: a second switch tube Q2, a second resistor R2 and a third resistor R3.
A first end of the second switch tube Q2 is connected to a first end of the sub-switch circuit 101 and a first end of the second resistor R2, respectively, and a second end of the second switch tube Q2 is connected to a second end of the second resistor R2 and a first end of the third resistor R3, respectively; a second terminal of the third resistor R3 is connected to a second terminal of the sub-switch circuit 101; the third terminal of the second switching tube Q2 is connected to the third terminal of the sub switching circuit 101.
In the case that the voltage of the first terminal of the second switching tube Q2 is not greater than the first voltage, the second switching tube Q2 is turned off.
When the voltage of the first end of the second switch tube Q2 is greater than the first voltage, the second switch tube Q2 is turned on.
Specifically, when the voltage of the first end of the second switch Q2 is not greater than the first voltage, the zener diode DX1 does not break down, and the current of the path where the second resistor R2, the third resistor R3 and the zener diode DX1 are located is small, so that the voltage drop generated by the second resistor R2 is small, and at this time, the voltage drop between the first end and the second end of the second switch Q2 is not enough to turn on the second switch Q2, so that the second switch Q2 is in an off state, the third end of the second switch Q2, that is, the third end of the sub-switch circuit 101 is grounded through the first resistor R1, and a low level is output, so that the first switch Q1 is turned on.
When the voltage of the first end of the second switching tube Q2 is greater than the first voltage and the zener diode DX1 breaks down, the second switching tube Q2 is turned on, so that the voltage of the third end (the third end of the sub-switching circuit 101) of the second switching tube Q2 is the voltage of the first end minus the switching tube conduction voltage drop to obtain a second level signal, and at this time, the voltage difference between the first end and the second end of the first switching tube Q1 can turn off the first switching tube Q1 to prevent the power supply from flowing backwards, thereby performing the function of overvoltage protection.
In an alternative embodiment, the breakdown voltage of the zener diode DX1 is greater than the voltage of the power supply VDC.
In order to prevent the malfunction of the first switching transistor Q1 caused by power supply fluctuations, the breakdown voltage of the zener diode DX1 is set to be greater than the voltage of the power supply VDC of the interface to be protected, and for example, if the power supply VDC is 5V, the zener diode DX1 having a breakdown voltage of 5.6V may be selected.
In an alternative embodiment, the first switching tube Q1 includes: a P-channel MOSFET (hereinafter referred to as PMOS transistor); the second switching tube Q2 includes: PNP type triode.
As can be seen from the above description of the circuit connection relationship and functions of the interface protection circuit, if the first switch transistor Q1 is a PMOS transistor and the second switch transistor Q2 is a PNP type triode, then to implement the interface protection function, the source of the PMOS transistor is the first end of the first switch transistor Q1, the gate of the PMOS transistor is the second end of the first switch transistor Q1, and the drain of the PMOS transistor is the third end of the first switch transistor Q1; the emitter of the PNP transistor is the first terminal of the second switch Q2, the base of the PNP transistor is the second terminal of the second switch Q2, and the collector of the PNP transistor is the third terminal of the second switch Q2.
The interface protection circuit that the following use waits to protect the power supply VDC of interface is 5V, and zener diode DX 1's breakdown voltage is 5.6V and when waiting to protect the interface and carry out the short-circuit test, inserts 16V voltage at waiting to protect the interface as the example, and is right the embodiment of the utility model provides an illustrate. The resistance of the pull-up resistor RX is 330 Ω, the resistance of the first resistor R1 is 47k Ω, the resistance of the second resistor R2 is 47k Ω, and the resistance of the third resistor R3 is 4.7k Ω.
When the interface to be protected is not connected with voltage, the voltage at the point A in FIG. 4 is VaWhen the voltage of the zener diode DX1 is not broken down, the current in the path is only a slight leakage current, so the voltage at the point C is approximately the same as the point a, which results in the second switch Q2 being in a cut-off state, and thus the voltage at the point B is V2, which is 4.3V, where 0.7V represents the voltage drop of the PMOS body diodeb0V (to ground through a first resistor R1). Therefore, at this time, the gate of the first switching tube Q1 is 0V, the source thereof is 4.3V, and V is satisfiedgs<0 and Vgs<Vgs(th)The conduction condition, first switch tube Q1 switches on, and on resistance between its drain electrode and the source electrode is the m omega rank, consequently, the embodiment of the utility model provides an interface protection circuit is very little to the influence of resistance detection precision.
When 16V voltage is not connected to the interface to be protected, the voltage at the point C is far more than 5.6V, the voltage stabilizing diode DX1 breaks down,the terminal voltage is approximately 5.6V, and the voltage at the point A is Va16V-330 (16V-5.6V-0.7V)/(330+4700) 15.3V (neglecting triode base current), and the voltage at point C is Vc＝Va-0.7V＝14.6V，(Vbe0.7V) in this case, the second switching tube Q2 is turned on, and enters a saturation operating state, so that the voltage V at point B is further caused to be in a saturation operating stateb＝Va-0.3V, V of the first switching tube Q1gs-0.3V, not satisfying Vgs<Vgs(th)Therefore, the first switching tube Q1 is turned off, and the 16V short-circuit power supply is prevented from reversely flowing current to the power supply VDC of the interface to be protected, thereby performing an overvoltage protection function.
In an alternative embodiment, the interface to be protected comprises: an electric vehicle charging gun detection interface.
The utility model provides an interface protection circuit is applicable in electric vehicle charging gun detection interface, from the analysis in the circuit design principle, compares in prior art and adopts the diode to realize preventing the interface protection circuit of flowing backward the function, the embodiment of the utility model provides an interface protection circuit more is applicable to the equivalent model of arbitrary a load and is the interface of resistance, of course, also is applicable to other interfaces that do not have special requirement to resistance detection precision.
To sum up, the embodiment of the utility model provides an interface protection circuit, through first switch tube Q1 and on-off control circuit 10's combined action, the function of the first switch tube Q1 of automatic disconnection when can realizing the interface excessive pressure, and then prevent to flow backward the product function that leads to because of the power unusual to, because the on-resistance of switch tube is enough little, consequently, the utility model provides an interface protection circuit can treat the power supply VDC of protecting the interface and effectively protect under the prerequisite that does not influence resistance detection precision to the technical problem that the interface protection circuit among the prior art exists that leads to equipment status testing result accuracy low has been alleviated.
Example two
The embodiment of the utility model provides a still provide a gun detection circuitry inserts, as shown in FIG. 5, should insert gun detection circuitry includes any kind of interface protection circuit in the above-mentioned embodiment one, still includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and an access switch S1.
A first end of the fourth resistor R4 is connected to the interface to be protected and a first end of the fifth resistor R5, respectively, and a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6 and a first end of the access switch S1, respectively; the second terminal of the fourth resistor R4, the second terminal of the sixth resistor R6, and the second terminal of the access switch S1 are connected to the ground GND.
The embodiment of the utility model provides a gun detection circuitry inserts, the circuit in the vehicle socket is represented to left part (fourth resistance R4) in the dotted line frame in figure 5, and the part on right side (fifth resistance R5, sixth resistance R6 and access switch S1) in the dotted line frame represents the circuit in the vehicle plug, and the inside preset position of vehicle is located to interface protection circuit outside the dotted line.
The electric vehicle charging insertion gun detects the load of the interface, namely a circuit formed by a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and an access switch S1, wherein an equivalent model of the circuit is resistors, the access switch S1 is normally switched on and off once, namely, switched on, switched off and switched off, in the process of inserting the charging insertion gun into an electric vehicle, and when the access switch S1 is in a switched-off state, the equivalent resistor of the interface load is connected in parallel with the fourth resistor R4 after the fifth resistor R5 is connected in series with the sixth resistor R6; when the access switch S1 is in a closed state, the equivalent resistance of the interface load is the parallel connection of the fourth resistor R4 and the fifth resistor R5, and then the electric vehicle charging insertion gun detection interface can determine whether the insertion gun is accurately connected according to the resistance value change of the load. Fig. 6 shows a schematic diagram of another electric vehicle charging gun detection interface circuit connection (the interface protection circuit provided in the first embodiment of the present invention is not shown in the figure).
The embodiment of the utility model provides an electric vehicle control circuit is still provided, and this electric vehicle control circuit includes any kind of interface protection circuit in the above-mentioned embodiment one.
The embodiment of the utility model provides a vehicle is still provided, the electric vehicle control circuit in the above is used to this vehicle.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An interface protection circuit, comprising: the pull-up resistor, the switch control circuit and the first switching tube are connected in series;
the first end of the pull-up resistor is connected with the interface to be protected, and the second end of the pull-up resistor is respectively connected with the input end of the switch control circuit and the first end of the first switch tube; the output end of the switch control circuit is connected with the second end of the first switch tube; the third end of the first switch tube is connected with a power supply of the interface to be protected;
the switch control circuit is used for outputting a first level signal to the first switch tube when detecting that the voltage of the input end of the switch control circuit is not more than a first voltage so as to enable the first switch tube to be conducted; wherein the first voltage is greater than a voltage of the power supply;
the switch control circuit is further used for outputting a second level signal to the first switch tube when detecting that the voltage of the input end of the switch control circuit is greater than the first voltage, so that the first switch tube is disconnected.
2. The interface protection circuit of claim 1, wherein the switch control circuit comprises: the circuit comprises a sub-switch circuit, a voltage stabilizing diode and a first resistor;
the first end of the sub-switch circuit is connected with the input end of the switch control circuit, the second end of the sub-switch circuit is connected with the cathode of the voltage stabilizing diode, and the third end of the sub-switch circuit is respectively connected with the first end of the first resistor and the output end of the switch control circuit; the anode of the voltage stabilizing diode and the second end of the first resistor are connected with a grounding end;
under the condition that the voltage of the first end of the sub-switch circuit is not larger than the first voltage, the sub-switch circuit is switched off, so that the third end of the sub-switch circuit outputs the first level signal;
and when the voltage of the first end of the sub-switch circuit is greater than the first voltage, the sub-switch circuit is conducted, so that the third end of the sub-switch circuit outputs the second level signal.
3. The interface protection circuit of claim 2, wherein the sub-switch circuit comprises: the second switch tube, the second resistor and the third resistor;
the first end of the second switch tube is respectively connected with the first end of the sub-switch circuit and the first end of the second resistor, and the second end of the second switch tube is respectively connected with the second end of the second resistor and the first end of the third resistor; the second end of the third resistor is connected with the second end of the sub-switch circuit; the third end of the second switch tube is connected with the third end of the sub-switch circuit;
under the condition that the voltage of the first end of the second switch tube is not larger than the first voltage, the second switch tube is switched off;
and under the condition that the voltage of the first end of the second switching tube is greater than the first voltage, the second switching tube is conducted.
4. The interface protection circuit of claim 2, wherein the breakdown voltage of the zener diode is greater than the voltage of the power supply.
5. The interface protection circuit of claim 1, wherein the first switching tube comprises: a P-channel MOSFET.
6. The interface protection circuit of claim 3, wherein the second switching tube comprises: PNP type triode.
7. The interface protection circuit of claim 1, wherein the interface to be protected comprises: an electric vehicle charging gun detection interface.
8. A lance detection circuit comprising the interface protection circuit of any one of claims 1 to 7, further comprising: the fourth resistor, the fifth resistor, the sixth resistor and the access switch;
a first end of the fourth resistor is connected with a port to be protected and a first end of the fifth resistor respectively, and a second end of the fifth resistor is connected with a first end of the sixth resistor and a first end of the access switch respectively; and the second end of the fourth resistor, the second end of the sixth resistor and the second end of the access switch are connected with a ground terminal.
9. An electric vehicle control circuit comprising the interface protection circuit of any of claims 1-7.
10. A vehicle to which the electric vehicle control circuit of claim 9 is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120547173.0U CN214669449U (en) | 2021-03-16 | 2021-03-16 | Interface protection circuit, gun insertion detection circuit, electric vehicle control circuit and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120547173.0U CN214669449U (en) | 2021-03-16 | 2021-03-16 | Interface protection circuit, gun insertion detection circuit, electric vehicle control circuit and vehicle |
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| Publication Number | Publication Date |
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| CN214669449U true CN214669449U (en) | 2021-11-09 |
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| CN202120547173.0U Active CN214669449U (en) | 2021-03-16 | 2021-03-16 | Interface protection circuit, gun insertion detection circuit, electric vehicle control circuit and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325473A (en) * | 2021-12-24 | 2022-04-12 | 广州星际悦动股份有限公司 | Short circuit detection circuit, method, device, electronic device and storage medium |
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2021
- 2021-03-16 CN CN202120547173.0U patent/CN214669449U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325473A (en) * | 2021-12-24 | 2022-04-12 | 广州星际悦动股份有限公司 | Short circuit detection circuit, method, device, electronic device and storage medium |
| CN114325473B (en) * | 2021-12-24 | 2024-03-08 | 广州星际悦动股份有限公司 | Short circuit detection circuit, short circuit detection method, short circuit detection device, electronic equipment and storage medium |
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