Resistance detection circuit, dimming circuit and vehicle

Abstract

The invention provides a resistance detection circuit, a dimming circuit and a vehicle. In the resistance detection circuit, the first protection resistor is connected in series with the detection resistor, so that the first protection resistor can also perform voltage division with the divider resistor under the condition that the detection resistor has a short-circuit fault, and the drop amplitude of the output voltage of the resistance detection circuit is reduced under the condition. In addition, the second protection resistor is connected in parallel between the two ends of the series branch formed by the detection resistor and the first protection resistor, so that the second protection resistor and the divider resistor can perform voltage division under the condition that the detection resistor has an open circuit fault, and the drop amplitude of the output voltage of the resistance detection circuit is reduced under the condition. In conclusion, the resistance detection circuit can reduce the decrease amplitude of the self output voltage under the condition that the self detection resistance is abnormal, so that the resistance detection circuit reduces the possibility that the output voltage of the resistance detection circuit is abnormal due to the abnormity of the self detection resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of dimming control, and in particular to a resistance detection circuit, a dimming circuit and a vehicle. Background Art

[0002] In recent years, as the requirements for circuit reliability and safety have become increasingly higher, circuit design solutions require DFMEA analysis. According to the limitations of circuit functions, the complexity of control logic, cost control and other factors, circuits are divided into circuits with MCU and circuits without MCU.

[0003] Generally, the detection resistor in the resistance detection circuit may be abnormal, which may cause the output voltage of the resistance detection circuit to be abnormal, and may further damage the subsequent circuit. If the resistance detection circuit is a circuit with an MCU, the above problem can be easily solved through software design, but if the resistance detection circuit is a circuit without an MCU, the above problem cannot be solved through software design.

[0004] Therefore, how to reduce the possibility of abnormal output voltage of the resistance detection circuit due to abnormal detection resistance is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a resistance detection circuit, a dimming circuit and a vehicle to reduce the possibility of abnormal output voltage of the resistance detection circuit due to abnormal detection resistance.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] The first aspect of the present application provides a resistance detection circuit, comprising: a voltage dividing resistor, a detection resistor and two protection resistors; wherein:

[0008] One end of the voltage dividing resistor is connected to the positive electrode of the power supply;

[0009] The detection resistor is connected in series with the first protection resistor;

[0010] One end of the series branch formed by the detection resistor and the first protection resistor is connected to the other end of the voltage divider resistor, and the connection point serves as the output end of the resistance detection circuit;

[0011] The other end of the series branch formed by the detection resistor and the first protection resistor is connected to the negative electrode of the power supply;

[0012] The second protection resistor is connected in parallel between two ends of a series branch formed by the detection resistor and the first protection resistor.

[0013] Optionally, the resistance of the first protection resistor is equal to a first preset value;

[0014] The first preset value is a resistance value that enables the output voltage of the resistance detection circuit to be within a safe voltage range when a short circuit failure occurs in the detection resistor.

[0015] Optionally, the resistance of the second protection resistor is equal to a second preset value;

[0016] The second preset value is a resistance value that enables the output voltage of the resistance detection circuit to be within a safe voltage range when a short-circuit failure occurs in the detection resistor.

[0017] Optionally, it also includes: a protection capacitor; wherein:

[0018] The protection capacitor is connected in parallel between two ends of a series branch formed by the detection resistor and the first protection resistor.

[0019] Optionally, the protection capacitor includes: at least one sub-capacitor; wherein:

[0020] If the number of the sub-capacitors is greater than 1, all the sub-capacitors are connected in series, and the two ends of the formed series branch serve as the two ends of the protection capacitor respectively;

[0021] If the number of the sub-capacitors is equal to , the two ends of the sub-capacitors serve as the two ends of the protection capacitor respectively.

[0022] Optionally, the resistors in the resistance detection circuit all include: at least one sub-resistor; wherein:

[0023] If the number of the sub-resistors is greater than 1, all the sub-resistors are connected in series, and the two ends of the formed series branch serve as the two ends of the corresponding resistor respectively;

[0024] If the number of the sub-resistors is equal to , the two ends of the sub-resistors serve as the two ends of the corresponding resistors respectively.

[0025] The second aspect of the present application provides a dimming circuit, comprising: a driving circuit and a resistance detection circuit as described in any one of the first aspects of the present application; wherein:

[0026] The detection resistor in the resistance detection circuit is used to characterize the brightness of the lamp corresponding to the dimming circuit;

[0027] The driving circuit is used to adjust the brightness of the lamp according to the output voltage of the resistance detection circuit.

[0028] Optionally, the driving circuit is an IC chip.

[0029] A third aspect of the present application provides a vehicle, comprising: at least one lamp and at least one dimming circuit as described in any one of the second aspects of the present application; wherein:

[0030] Each of the dimming circuits corresponds to at least one of the lamps.

[0031] Optionally, all of the lamps include at least one of the following: at least one lighting lamp for providing a lighting function, at least one signal light for indicating the driving status of the vehicle, and at least one atmosphere light.

[0032] It can be seen from the above technical solution that the present invention provides a resistance detection circuit. In the resistance detection circuit, since the first protection resistor is connected in series with the detection resistor, in the case of a short circuit fault in the detection resistor, the first protection resistor can also divide the voltage with the voltage-dividing resistor, so that the output voltage of the resistance detection circuit in this case decreases. In addition, since the second protection resistor is connected in parallel between the two ends of the series branch formed by the detection resistor and the first protection resistor, in the case of a short circuit fault in the detection resistor, the second protection resistor can also divide the voltage with the voltage-dividing resistor, so that the output voltage of the resistance detection circuit in this case decreases. In summary, the resistance detection circuit can reduce the decrease in its own output voltage when its own detection resistor is abnormal, so the resistance detection circuit reduces the possibility of abnormal output voltage of the resistance detection circuit due to abnormal detection resistor itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1-Figure 3 The schematic diagrams are respectively structural diagrams of three implementation modes of the resistance detection circuit provided in the embodiments of the present application;

[0035] Figure 4 A schematic diagram of a structure of an implementation of a dimming circuit provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of a specific example of a dimming circuit provided in an embodiment of the present application;

[0037] Figure 6 A schematic structural diagram of an implementation scheme of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0040] In order to reduce the possibility of abnormal output voltage of the resistance detection circuit due to abnormal detection resistance, another embodiment of the present application provides a resistance detection circuit, whose specific structure is as follows: Figure 1 As shown, it specifically includes: a voltage dividing resistor Rf, a detection resistor RBIN and two protection resistors RB1 and RB2; the connection relationship between each device is as follows:

[0041] One end of the voltage dividing resistor Rf is connected to the positive electrode of the power supply 10 .

[0042] The voltage divider resistor Rf includes: at least one sub-resistor. If the number of sub-resistors is greater than 1, all sub-resistors are connected in series, and the two ends of the formed series branch serve as the two ends of the voltage divider resistor Rf. If the number of sub-resistors is equal to, the two ends of the sub-resistor serve as the two ends of the voltage divider resistor Rf.

[0043] The detection resistor RBIN is connected in series with the first protection resistor RB1 , wherein the detection resistor RBIN is a resistor whose resistance needs to be detected in the resistance detection circuit.

[0044] The detection resistor RBIN includes: at least one sub-resistor. If the number of sub-resistors is greater than 1, all sub-resistors are connected in series, and the two ends of the formed series branch serve as the two ends of the detection resistor RBIN respectively. If the number of sub-resistors is equal to, the two ends of the sub-resistor serve as the two ends of the detection resistor RBIN respectively.

[0045] The first protection resistor RB1 includes: at least one sub-resistor. If the number of the sub-resistors is greater than 1, all the sub-resistors are connected in series, and the two ends of the formed series branch serve as the two ends of the first protection resistor RB1. If the number of the sub-resistors is equal to 1, the two ends of the sub-resistors serve as the two ends of the first protection resistor RB1.

[0046] One end of a series branch formed by the detection resistor RBIN and the first protection resistor RB1 is connected to the other end of the voltage-dividing resistor Rf, and the connection point serves as an output end of the resistance detection circuit.

[0047] The other end of the series branch formed by the detection resistor RBIN and the first protection resistor RB1 is connected to the negative electrode of the power supply 10 .

[0048] The second protection resistor RB2 is connected in parallel between two ends of a series branch formed by the detection resistor RBIN and the first protection resistor RB1.

[0049] The second protection resistor RB2 includes: at least one sub-resistor. If the number of the sub-resistors is greater than 1, all the sub-resistors are connected in series, and the two ends of the formed series branch serve as the two ends of the second protection resistor RB2. If the number of the sub-resistors is equal to 1, the two ends of the sub-resistors serve as the two ends of the second protection resistor RB2.

[0050] Optionally, the negative electrode of the power supply 10 can be grounded, such as Figure 2 As shown, it may not be grounded, which is not specifically limited here and can be determined according to specific circumstances, all within the protection scope of this application.

[0051] It can be seen from the above connection relationship that when the resistance value of the detection resistor RBIN changes, the voltage division of the voltage divider resistor Rf, the detection resistor RBIN, the first protection resistor RB1 and the second protection resistor RB2 all change, so that the voltage division of the series branch composed of the detection resistor RBIN and the first protection resistor RB1 changes, and then the output voltage of the resistance detection circuit changes. Therefore, the resistance value of the detection resistor RBIN can be known through the output voltage of the resistance detection circuit. In other words, the output voltage of the resistance detection circuit can be used to characterize the resistance value of the detection resistor RBIN.

[0052] It can be seen from the above connection relationship that when a short circuit fault occurs in the detection resistor RBIN, that is, when the resistance of the detection resistor RBIN is approximately equal to zero, the resistance of the series branch composed of the detection resistor RBIN and the first protection resistor RB1 decreases, thereby reducing the resistance of the branch composed of the detection resistor RBIN, the first electrical protection resistor and the second protection resistor RB2, and then reducing the voltage division of the branch composed of the detection resistor RBIN, the first electrical protection resistor and the second protection resistor RB2, so that the output voltage of the resistance detection circuit decreases.

[0053] It can be seen from the above connection relationship that when the detection resistor RBIN has a short circuit fault, that is, when the resistance of the detection resistor RBIN is approximately equal to infinity, the resistance of the series branch composed of the detection resistor RBIN and the first protection resistor RB1 is approximately equal to infinity, so that the resistance of the branch composed of the detection resistor RBIN, the first electrical protection resistor and the second protection resistor RB2 increases, and then the voltage division of the branch composed of the detection resistor RBIN, the first electrical protection resistor and the second protection resistor RB2 increases, so the output voltage of the resistance detection circuit increases.

[0054] Since the first protection resistor RB1 is connected in series with the detection resistor RBIN, in the case of a short circuit fault in the detection resistor RBIN, the first protection resistor RB1 can also divide the voltage with the voltage divider resistor Rf, so that the output voltage of the resistance detection circuit in this case decreases. In addition, since the second protection resistor RB2 is connected in parallel between the two ends of the series branch formed by the detection resistor RBIN and the first protection resistor RB1, in the case of an open circuit fault in the detection resistor RBIN, the second protection resistor RB2 can also divide the voltage with the voltage divider resistor Rf, so that the output voltage of the resistance detection circuit in this case decreases.

[0055] Normally, when the detection resistor RBIN is abnormal, three types of faults may occur: short circuit fault, open circuit fault, and resistance value exceeding the design range. However, when the resistance value of the detection resistor RBIN exceeds the design range and reaches two limits, it is equivalent to: the detection resistor RBIN has a short circuit fault or an open circuit fault, so it is only necessary to analyze the change in the output voltage of the resistance detection circuit when the detection resistor RBIN has a short circuit fault or an open circuit fault to represent all situations.

[0056] Therefore, in summary, the resistance detection circuit reduces the drop in its own output voltage when its own detection resistor RBIN is abnormal, thereby reducing the possibility of the output voltage of the resistance detection circuit being abnormal due to the abnormality of its own detection resistor RBIN.

[0057] In addition, since the resistance detection circuit only includes four resistors, the resistance detection circuit reduces the possibility of abnormal output voltage of the resistance detection circuit due to abnormality of its own detection resistor RBIN, while also making its overall cost relatively low and the circuit structure relatively simple, which is beneficial to the design, development and production of the resistance detection circuit.

[0058] As can be seen from the above connection relationship, when a short circuit fault occurs in the detection resistor RBIN, the first protection resistor RB1 and the second protection resistor RB2 are connected in parallel, so the divided voltage of the branch composed of the detection resistor RBIN, the first protection resistor and the second protection resistor RB2 is equal to the divided voltage of the first protection resistor RB1, that is, the output voltage of the resistance detection circuit is equal to the divided voltage of the first protection resistor RB1. Therefore, by setting the resistance value of the first protection resistor RB1, the output voltage of the resistance detection circuit in this case can be set.

[0059] Therefore, another embodiment of the present application provides another implementation of the resistance detection circuit, which is different from the above implementation in that:

[0060] In this implementation, the resistance of the first protection resistor RB1 is equal to the first preset value.

[0061] The first preset value is a resistance value that makes the output voltage of the resistance detection circuit within a safe voltage range when a short circuit occurs in the detection resistor RBIN. The output voltage of the resistance detection circuit is within a safe voltage range, indicating that the output voltage of the resistance detection circuit will not cause damage to the subsequent circuit of the resistance detection circuit. In practical applications, the first preset value is set according to actual conditions and is not specifically limited here.

[0062] In the present embodiment, since the first preset value is a resistance value at which the output voltage of the resistance detection circuit will not cause damage to the subsequent circuit of the resistance detection circuit when a short circuit fault occurs in the detection resistor RBIN, the present embodiment sets the resistance value of the first protection resistor RB1 to the first preset value to ensure that the output voltage of the resistance detection circuit will not cause damage to the subsequent circuit of the resistance detection circuit, thereby enabling the resistance detection circuit to have a reliable failure protection mechanism, thereby improving the safety of the resistance detection circuit and reducing the possibility of safety accidents.

[0063] As can be seen from the above connection relationship, when a short circuit fault occurs in the detection resistor RBIN, the first protection resistor RB1 is connected in parallel with the voltage divider resistor Rf, so the voltage divider of the branch composed of the detection resistor RBIN, the first protection resistor and the second protection resistor RB2 is equal to the voltage divider of the second protection resistor RB2, that is, the output voltage of the resistance detection circuit is equal to the voltage divider of the second protection resistor RB2. Therefore, by setting the resistance value of the second protection resistor RB2, the output voltage of the resistance detection circuit in this case can be set.

[0064] Therefore, another embodiment of the present application provides another implementation of the resistance detection circuit, which is different from the above implementation in that:

[0065] In this implementation, the resistance of the second protection resistor RB2 is equal to the second preset value.

[0066] The second preset value is a resistance value that makes the output voltage of the resistance detection circuit fall within a safe voltage range when a short circuit failure occurs in the detection resistor RBIN. In practical applications, the second preset value is set according to actual conditions and is not specifically limited here.

[0067] It should be noted that the output voltage of the resistance detection circuit is within a safe voltage range, which has been described in detail in the above embodiments and will not be repeated here.

[0068] In this embodiment, since the second preset value is a resistance value at which the output voltage of the resistance detection circuit will not cause damage to the subsequent circuit of the resistance detection circuit when a short circuit fault occurs in the detection resistor RBIN, this embodiment sets the resistance value of the second protection resistor RB2 to the second preset value to ensure that the output voltage of the resistance detection circuit will not cause damage to the subsequent circuit of the resistance detection circuit, thereby enabling the resistance detection circuit to have a reliable failure protection mechanism, thereby improving the safety of the resistance detection circuit and reducing the possibility of safety accidents.

[0069] Another embodiment of the present application provides another implementation of the resistance detection circuit, and its specific structure is as follows: Figure 3 As shown, this implementation, based on the above implementation, further includes: a protection capacitor CB.

[0070] The protection capacitor CB is connected in parallel between the two ends of the series branch formed by the detection resistor RBIN and the first protection resistor RB1. The protection capacitor CB is used to maintain the stability of the voltage division of the series branch formed by the detection resistor RBIN and the first protection resistor RB1, that is, to maintain the stability of the output voltage of the resistance detection circuit.

[0071] The protection capacitor CB includes: at least one sub-capacitor. If the number of sub-capacitors is greater than 1, all sub-capacitors are connected in series, and the two ends of the formed series branch serve as the two ends of the protection capacitor CB. If the number of sub-capacitors is equal to 1, the two ends of the sub-capacitor serve as the two ends of the protection capacitor CB.

[0072] In this embodiment, the protection circuit is used to maintain the stability of the output voltage of the resistance detection circuit, thereby reducing the possibility that the output voltage of the resistance detection circuit causes erroneous control of the subsequent circuit, thereby improving the control accuracy of the subsequent circuit.

[0073] Another embodiment of the present application provides a dimming circuit, whose specific structure is as follows: Figure 4 As shown, it specifically includes: a driving circuit 100 and a resistance detection circuit 200 provided in the above embodiment.

[0074] The detection resistor RBIN in the resistance detection circuit 200 is used to indicate the brightness of the lamp corresponding to the dimming circuit.

[0075] In a specific example, the resistance value of the detection resistor RBIN is negatively correlated with the brightness of the lamp corresponding to the dimming circuit, that is, the higher the brightness of the lamp corresponding to the dimming circuit, the smaller the resistance value of the detection resistor RBIN.

[0076] In another specific example, the resistance value of the detection resistor RBIN is positively correlated with the brightness of the lamp corresponding to the dimming circuit, that is, the higher the brightness of the lamp corresponding to the dimming circuit, the greater the resistance value of the detection resistor RBIN.

[0077] The above two examples show two corresponding relationships between the resistance value of the detection resistor RBIN and the brightness of the lamp corresponding to the dimming circuit. No specific limitation is made here and it can be determined according to the specific situation. All of them are within the protection scope of this application.

[0078] The driving circuit 100 is used to adjust the brightness of the lamp corresponding to the dimming circuit according to the output voltage of the resistance detection circuit 200 .

[0079] In a specific example, if the output voltage of the resistance detection circuit 200 decreases, the lamp corresponding to the dimming circuit is dimmed.

[0080] In another specific example, if the output voltage of the resistance detection circuit 200 increases, the lamp corresponding to the dimming circuit is dimmed.

[0081] The above two examples show two implementation methods of adjusting the brightness of the lamp corresponding to the dimming circuit according to the output voltage of the resistance detection circuit 200. No specific limitation is made here and it can be determined according to the specific situation, which is within the protection scope of this application.

[0082] In a specific example, the driving circuit adjusts the magnitude of the current output to the lamp corresponding to the dimming circuit according to the output voltage of the resistance detection circuit 200 to adjust the brightness of the lamp corresponding to the dimming circuit.

[0083] The above example only shows an implementation method of the driving circuit adjusting the brightness of the lamp corresponding to the dimming circuit. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific circumstances, all of which are within the scope of protection of this application.

[0084] Optionally, the driving circuit 100 is an IC chip, such as Figure 3 As shown in 110, in practical applications, including but not limited to this, no specific limitation is made here, and it may be determined according to the specific circumstances, all of which are within the protection scope of this application.

[0085] In this embodiment, since the resistance detection circuit 200 reduces the possibility of abnormal output voltage of the resistance detection circuit 200 due to abnormal detection resistance RBIN of the resistance detection circuit 200, the dimming circuit can reduce the possibility of damage to the driving circuit 100, thereby reducing the possibility of damage to the corresponding lamp, thereby improving the reliability and safety of the dimming circuit.

[0086] A specific example of a dimming circuit is provided below. Figure 5 As shown, the first end of the resistor R21 receives the working voltage Vref, the second end of the resistor R21 is connected to the first end of the resistor R22, and the second end of the resistor R22 is grounded GND. The first end of the resistor R21 is connected to the Vref pin of the IC chip. The second end of the resistor R21 is connected to the first end of the resistor R23, the second end of the resistor R23 is connected to the first end of the detection resistor RBIN, and the second end of the resistor RBIN is grounded GND. The first end of the resistor R21 is connected to one end of the capacitor C21, and the other end of the capacitor C21 is grounded. The second end of the resistor R21 is connected to the IADJ pin of the IC chip. The capacitor C22 is connected in parallel with the detection resistor RBIN. The first end of the detection resistor RBIN is connected to the BIN+ pin of the lamp chip. The LED+ and LED- of the lamp chip are respectively the power supply pins of the lamp chip. The IC chip outputs a current I to the lamp LED To adjust the brightness of the LED.

[0087] The corresponding relationship between the brightness of the lamp and the resistance value of the detection resistor RBIN is shown in the following table:

[0088]

[0089] In practical applications, the operating voltage Vref is 4.96V, and the brightness BIN is related to the voltage V of the IADJ pin of the IC chip. IADJ The corresponding relationship is shown in the following table:

[0090]

[0091] It can be seen that when the resistor RBIN fails to short circuit, V IADJ Reaching the minimum value of 0.86011V, when the resistor RBIN fails, V IADJ The maximum value reaches 1.75058. Under normal circumstances, the IADJ pin of the IC chip is the analog dimming sampling pin. When the voltage of this pin changes between 2.25V and 0.14V, analog dimming can be achieved, that is, V IADJ The safety range of V is 2.25V~0.14V, so even if the resistor RBIN fails to short circuit or open circuit, V IADJ It is also within the safe range, that is, the dimming circuit will not be damaged.

[0092] The output current formula for analog dimming is:

[0093]

[0094] Where RCS = 0.15Ω, the voltage V IADJ Substituting into the above formula, we get I LED . Brightness BIN and I LED The corresponding relationship between them is shown in the following table:

[0095]

[0096] It can be seen that when the resistor RBIN is short-circuited, I LED Reaching the maximum value of 0.8336A, when the resistor RBIN fails, I LED The minimum value is 0.4095, and usually, I LED The safety range of I is 0.4~0.85A, so even if the resistor RBIN has a short circuit fault or an open circuit fault, I LED It is also within the safety range, i.e. the lamp will not be damaged.

[0097] Another embodiment of the present application provides a vehicle, the specific structure of which can be seen in Figure 6 (The figure only shows an example in which each dimming circuit 400 corresponds to each lamp 300 one by one), specifically including: at least one lamp 300 and at least one dimming circuit 400 provided in the above embodiment.

[0098] Each dimming circuit 400 corresponds to at least one lamp 300 .

[0099] In a specific example, each dimming circuit 400 corresponds to each lamp 300 one by one. Figure 6 As shown, in other words, one dimming circuit 400 adjusts the brightness of one lamp 300. Since each dimming circuit 400 corresponds to each lamp 300, the brightness of each lamp 300 can be independently controlled, so that more combinations are possible. However, this requires a large number of dimming circuits 400, which increases the overall cost of the vehicle.

[0100] In another specific example, each dimming circuit 400 corresponds to a plurality of lamps 300. In other words, one dimming circuit 400 adjusts the brightness of a plurality of lamps 300. Since each dimming circuit 400 corresponds to a plurality of lamps 300, the brightness of some lamps 300 cannot be independently controlled, so that fewer combinations can be made. However, this requires fewer dimming circuits 400, thus reducing the overall cost of the vehicle.

[0101] The above two examples only show two corresponding relationships between the dimming circuit 400 and the lamp 300. In practical applications, including but not limited to these, no specific limitations are made here and it may depend on the specific circumstances, all of which are within the protection scope of this application.

[0102] Optionally, all lamps 300 may include at least one of the following: at least one lighting lamp for providing lighting function, at least one signal light for indicating the driving status of the vehicle, and at least one atmosphere light. No specific limitation is made here and it may depend on the specific situation and are all within the scope of protection of this application.

[0103] Optionally, the lighting lamp used to provide the lighting function may be a headlamp or a fog lamp. In practical applications, this includes but is not limited to these. No specific limitation is made here and it may be determined according to the specific circumstances. All of these are within the scope of protection of this application.

[0104] Optionally, the signal light used to indicate the driving status of the vehicle may be a turn signal light. In practical applications, this includes but is not limited to this. No specific limitation is made here and it may be determined according to the specific circumstances, all of which are within the scope of protection of this application.

[0105] In this embodiment, since the dimming circuit 400 has high reliability and safety, the reliability and safety of the vehicle are improved.

[0106] For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professionals in the field can implement or use the present application. The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A resistance detection circuit, characterized in that: include: A voltage divider resistor, a detection resistor, and two protection resistors; where: One end of the voltage dividing resistor is connected to the positive electrode of the power supply; The detection resistor is connected in series with the first protection resistor; One end of the series branch formed by the detection resistor and the first protection resistor is connected to the other end of the voltage divider resistor, and the connection point serves as the output end of the resistance detection circuit; The other end of the series branch formed by the detection resistor and the first protection resistor is connected to the negative electrode of the power supply; The second protection resistor is connected in parallel between two ends of a series branch formed by the detection resistor and the first protection resistor.

2. The resistance detection circuit according to claim 1, characterized in that: The resistance of the first protection resistor is equal to a first preset value; The first preset value is a resistance value that enables the output voltage of the resistance detection circuit to be within a safe voltage range when a short circuit failure occurs in the detection resistor.

3. The resistance detection circuit according to claim 1, characterized in that: The resistance of the second protection resistor is equal to a second preset value; The second preset value is a resistance value that enables the output voltage of the resistance detection circuit to be within a safe voltage range when a short-circuit failure occurs in the detection resistor.

4. The resistance detection circuit according to any one of claims 1 to 3, characterized in that: Also includes: Protection capacitor; where: The protection capacitor is connected in parallel between two ends of a series branch formed by the detection resistor and the first protection resistor.

5. The resistance detection circuit according to claim 4, characterized in that: The protection capacitor comprises: at least one sub-capacitor; wherein: If the number of the sub-capacitors is greater than 1, all the sub-capacitors are connected in series, and the two ends of the formed series branch serve as the two ends of the protection capacitor respectively; If the number of the sub-capacitors is equal to , the two ends of the sub-capacitors serve as the two ends of the protection capacitor respectively.

6. The resistance detection circuit according to any one of claims 1 to 3, characterized in that: The resistors in the resistance detection circuit all include: at least one sub-resistance; wherein: If the number of the sub-resistors is greater than 1, all the sub-resistors are connected in series, and the two ends of the formed series branch serve as the two ends of the corresponding resistor respectively; If the number of the sub-resistors is equal to , the two ends of the sub-resistors serve as the two ends of the corresponding resistors respectively.

7. A dimming circuit, characterized in that: include: A drive circuit and a resistance detection circuit as claimed in any one of claims 1 to 6; wherein: The detection resistor in the resistance detection circuit is used to characterize the brightness of the lamp corresponding to the dimming circuit; The driving circuit is used to adjust the brightness of the lamp according to the output voltage of the resistance detection circuit.

8. The dimming circuit according to claim 7, characterized in that: The driving circuit is an IC chip.

9. A vehicle, characterized in that: include: At least one lamp and at least one dimming circuit as claimed in claim 7 or 8; wherein: Each of the dimming circuits corresponds to at least one of the lamps.

10. The vehicle according to claim 9, characterized in that All of the lamps include at least one of the following: at least one lighting lamp for providing a lighting function, at least one signal lamp for indicating the driving status of the vehicle, and at least one atmosphere lamp.

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