Collision signal detection circuit, collision protection device and automobile

Abstract

A collision signal detection circuit, a collision protection device and an automobile belong to the technical field of power supplies, are connected with a collision sensor used for sensing collision action to output a first detection signal, and comprise a voltage division circuit, a hysteresis comparison circuit and a control circuit, the voltage division circuit performs voltage division on the first detection signal so as to output a second detection signal; the hysteresis comparison circuit compares the second detection signal with the first threshold voltage and the second threshold voltage to output a comparison signal; the difference value between the first threshold voltage and the second threshold voltage is the hysteresis width, the possibility of frequent jitter of the comparison signal is reduced due to the existence of the hysteresis width, the anti-interference capability of the collision detection circuit is improved, and the safety and reliability of the collision signal detection circuit are improved.

Description

Technical Field

[0001] The present application belongs to the field of automobiles, and in particular relates to a collision signal detection circuit, a collision protection device and an automobile. Background Art

[0002] The relevant collision signal detection circuit isolates the collision detection signal from the detection module through a comparator, and realizes the setting of the output high and low thresholds through the reference voltage value of the comparator. When a collision occurs, the set threshold is reached and the output signal level is flipped, thereby realizing collision judgment.

[0003] Although the relevant automobile collision detection circuit can meet the detection requirements of collision detection signals, due to the small range of its high and low thresholds, the interference signal at the input end can easily cause the detection end level to be incorrectly flipped, which in turn causes the system to make incorrect judgments, affecting normal operation and driving, and having low safety and reliability.

[0004] Therefore, the safety and reliability of the related collision signal detection circuit are low. Utility Model Content

[0005] In view of the above problems, the present application provides a collision signal detection circuit, a collision protection device and a car, aiming to solve the problems of low safety and reliability of related collision signal detection circuits.

[0006] In a first aspect, the present application provides an embodiment of the present application that provides a collision signal detection circuit connected to a collision sensor, wherein the collision sensor is configured to sense a collision action to output a first detection signal;

[0007] The collision signal detection circuit comprises:

[0008] a voltage dividing circuit connected to the collision sensor and configured to divide the first detection signal to output a second detection signal;

[0009] The hysteresis comparison circuit is connected to the voltage divider circuit and is configured to compare the second detection signal with the first threshold voltage and the second threshold voltage to output a comparison signal.

[0010] In the technical solution of the embodiment of the present application, since the hysteresis comparison circuit compares the second detection signal with the first threshold voltage and the second threshold voltage to output a comparison signal, the difference between the first threshold voltage and the second threshold voltage is the hysteresis width. The existence of the hysteresis width reduces the possibility of frequent jitter of the comparison signal, improves the anti-interference ability of the collision detection circuit, and thus improves the safety and reliability of the collision signal detection circuit.

[0011] In some embodiments, the hysteresis comparison circuit comprises:

[0012] a comparison module, connected to the voltage divider circuit, and configured to compare the second detection signal with the second threshold voltage to output the comparison signal;

[0013] The hysteresis module is connected to the comparison module and the voltage divider circuit, and is configured to configure the first threshold voltage so that the comparison module further compares the second detection signal with the first threshold voltage to output the comparison signal.

[0014] By adopting the above solution, the first threshold voltage is configured through the hysteresis module, so that the comparison module not only compares the second detection signal with the second threshold voltage, but also compares the second detection signal with the first threshold voltage, thereby realizing the setting of the hysteresis width of the hysteresis comparison circuit.

[0015] In some embodiments, the comparison module includes a comparator, a first resistor, and a second resistor;

[0016] The non-inverting input terminal of the comparator is used as the second detection signal input terminal of the comparison module, and is connected to the voltage divider circuit to receive the second detection signal;

[0017] The output end of the comparator serves as a comparison signal output end of the comparison module to output the comparison signal;

[0018] The inverting input terminal of the comparator is connected to the first end of the first resistor and the first end of the second resistor;

[0019] The power supply end of the comparator is connected to the first power supply, the second end of the second resistor is connected to the second power supply, and the second end of the first resistor and the ground end of the comparator are connected to the power ground.

[0020] The comparison circuit is simple and has low cost.

[0021] In some embodiments, the hysteresis module includes a first diode and a third resistor;

[0022] The cathode of the first diode is connected to the comparison signal output terminal of the comparison module, the first end of the third resistor is connected to the second detection signal input terminal of the comparison module, and the anode of the first diode is connected to the second end of the third resistor.

[0023] By connecting the first diode and the third resistor in series, and connecting the first diode and the third resistor in series between the output end of the comparison module and the input end of the comparison module, the hysteresis module is turned on and adjusts the first threshold voltage of the configuration comparison circuit only when the comparison signal jumps from a low level to a high level, thereby realizing the setting of the hysteresis width of the hysteresis comparison circuit.

[0024] In some embodiments, the first detection signal is a first PWM signal with a preset duty cycle; the second detection signal is a second PWM signal with a preset duty cycle;

[0025] The collision signal detection circuit also includes:

[0026] a first pull-up circuit, connected to the collision sensor and the voltage divider circuit, and configured to pull up the first detection signal;

[0027] The voltage dividing circuit is specifically configured to divide the voltage of the first PWM signal after being pulled up to output the second PWM signal;

[0028] The hysteresis comparison circuit is specifically configured to compare the second PWM signal with the first threshold voltage and the second threshold voltage to output a comparison signal.

[0029] Since the first detection signal is a first PWM signal with a preset duty cycle, the comparison signal output by the hysteresis comparison circuit after comparing the second PWM signal with the first threshold voltage and the second threshold voltage is also the preset duty cycle, and whether a collision occurs can be determined by judging whether the preset duty cycle is within a preset interval. The determination of the preset duty cycle must be based on the existence of a group of continuous PWM signals, so the influence of accidental interference signals on the final result will be eliminated, further improving the anti-interference performance, and further improving the safety and reliability.

[0030] In some embodiments, the collision signal detection circuit further includes:

[0031] a first filtering circuit, connected to the voltage divider circuit and the hysteresis comparison circuit, and configured to filter the second detection signal;

[0032] The hysteresis comparison circuit is specifically configured to compare the filtered second detection signal with a first threshold voltage and a second threshold voltage to output the comparison signal.

[0033] By filtering the second detection signal, the peak signal in the second detection signal is filtered out, thereby improving the reliability and safety of the collision detection circuit.

[0034] In some embodiments, the collision signal detection circuit further includes:

[0035] The second filtering circuit is connected to the control circuit and the hysteresis comparison circuit, and is configured to filter the comparison signal.

[0036] By filtering the comparison signal, the peak signal in the second detection signal is filtered out, thereby improving the reliability and safety of the collision detection circuit.

[0037] In some embodiments, the collision signal detection circuit further includes:

[0038] The second pull-up circuit is connected to the control circuit and the hysteresis comparison circuit, and is configured to pull up the comparison signal.

[0039] By pulling up the comparison signal, the voltage of the comparison signal is adapted to the voltage of the external control module, thereby improving the reliability and safety of the collision detection circuit.

[0040] In some embodiments, the collision signal detection circuit further includes:

[0041] an electrostatic protection circuit, connected to the collision sensor and the voltage divider circuit, and configured to perform electrostatic protection on the first detection signal;

[0042] The voltage divider circuit is specifically configured to divide the voltage of the first detection signal after electrostatic protection to output a second detection signal.

[0043] By performing electrostatic protection on the first detection signal, the possibility of electrostatic breakdown of the device is reduced, and the service life of the collision detection circuit is increased.

[0044] In a second aspect, an embodiment of the utility model further provides a collision protection device, the collision protection device comprising a control circuit and the above-mentioned collision signal detection circuit;

[0045] The control circuit is connected to the collision signal detection circuit and is configured to perform corresponding actions according to the comparison signal. In a third aspect, an embodiment of the utility model further provides a car, the car comprising a collision sensor and the above-mentioned collision signal detection circuit.

[0046] By adopting the above scheme, since the automobile includes the collision signal detection circuit of any of the above schemes, the possibility of frequent jitter of the comparison circuit output can be reduced, the anti-interference ability of the comparison circuit is improved, and the safety and reliability of the collision signal detection circuit are improved.

[0047] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0049] Figure 1 A schematic diagram of a structure of a collision signal detection circuit provided in an embodiment of the present application;

[0050] Figure 2 Another structural schematic diagram of a collision signal detection circuit provided in an embodiment of the present application;

[0051] Figure 3 Another structural schematic diagram of a collision signal detection circuit provided in an embodiment of the present application;

[0052] Figure 4 Another structural schematic diagram of a collision signal detection circuit provided in an embodiment of the present application;

[0053] Figure 5 Another structural schematic diagram of a collision signal detection circuit provided in an embodiment of the present application;

[0054] Figure 6 Another structural schematic diagram of a collision signal detection circuit provided in an embodiment of the present application;

[0055] Figure 7 Another structural schematic diagram of a collision signal detection circuit provided in an embodiment of the present application;

[0056] Figure 8 A schematic diagram of a partial circuit example of a collision signal detection circuit provided in an embodiment of the present application;

[0057] Fig. 9 Another exemplary schematic diagram of a partial circuit of a collision signal detection circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0060] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0061] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0062] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0063] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0064] At present, from the perspective of market development, the application of collision detection is becoming more and more extensive. Collision detection is widely used in transportation tools such as electric bicycles, motorcycles, and automobiles, as well as in military equipment and aerospace and other fields. With the continuous expansion of the application field of collision detection, its market demand is also constantly expanding.

[0065] In order to solve the problem of poor reliability and safety, the applicant has found that the collision detection signal after voltage division can be designed to be compared through a hysteresis comparator to output a comparison signal, thereby reducing the possibility of frequent jitter of the comparison signal and improving the anti-interference ability of the collision detection circuit, thereby improving the safety and reliability of the collision signal detection circuit.

[0066] The collision detection circuit disclosed in the embodiment of the present application can be used for an electrical device that uses collision detection as a safety protection device. The electrical device can be, but is not limited to, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0067] According to some embodiments of the present application, referring to Figure 1 , Figure 1 The structure diagram of the collision signal detection circuit provided by an embodiment of the present application is shown. For the convenience of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0068] The collision signal detection circuit is connected to the collision sensor 90 , and the collision sensor 90 is configured to sense a collision action to output a first detection signal.

[0069] The collision signal detection circuit includes a voltage divider circuit 01 , a hysteresis comparison circuit 02 and a control circuit 03 .

[0070] The voltage dividing circuit 01 is connected to the collision sensor 90 and is configured to divide the voltage of the first detection signal to output a second detection signal.

[0071] The hysteresis comparison circuit 02 is connected to the voltage divider circuit 01 and is configured to compare the second detection signal with the first threshold voltage and the second threshold voltage to output a comparison signal.

[0072] It can be understood that the detection signal can be a level signal, and the first threshold voltage is greater than the second threshold voltage; when the voltage of the second detection signal increases, the hysteresis comparison circuit 02 compares the second detection signal with the first threshold voltage to output a comparison signal; when the voltage of the second detection signal decreases, the hysteresis comparison circuit 02 compares the second detection signal with the second threshold voltage to output a comparison signal; thereby, when the second detection signal jitters between the first threshold voltage and the second threshold voltage, the level polarity of the original comparison signal is maintained.

[0073] It can be understood that the first detection signal and the second detection signal can also be PWM signals. The hysteresis comparison circuit 02 can compare the PWM signal with the first threshold voltage and the second threshold voltage to output a comparison signal. Due to the existence of the hysteresis width of the hysteresis comparison circuit 02, the influence of the interference signal in the PWM signal is reduced.

[0074] In the technical solution of the embodiment of the present application, since the hysteresis comparison circuit 02 compares the second detection signal with the first threshold voltage and the second threshold voltage to output a comparison signal, the difference between the first threshold voltage and the second threshold voltage is the hysteresis width. The existence of the hysteresis width reduces the possibility of frequent jitter of the comparison signal, improves the anti-interference ability of the collision detection circuit, and thus improves the safety and reliability of the collision signal detection circuit.

[0075] In some embodiments, optionally, please continue to refer to Figure 2 The hysteresis comparison circuit 02 includes a comparison module 021 and a hysteresis module 022 .

[0076] The comparison module 021 is connected to the voltage divider circuit 01 and is configured to compare the second detection signal with the second threshold voltage to output a comparison signal.

[0077] The hysteresis module 022 is connected to the comparison module 021 and the voltage divider circuit 01, and is configured to configure a first threshold voltage so that the comparison module 021 also compares the second detection signal with the first threshold voltage to output a comparison signal.

[0078] It can be understood that the comparison module 021 includes a reference module, and the reference module is used to provide the second threshold voltage.

[0079] In a specific implementation, the hysteresis module 022 is connected in parallel with the comparison module 021. When the comparison signal jumps from a low level to a high level, the hysteresis module 022 is turned on and configures a first threshold voltage; when the comparison signal jumps from a high level to a low level, the hysteresis module 022 is turned off and stops working; thereby, when the voltage of the second detection signal increases, the hysteresis comparison circuit 02 compares the second detection signal with the first threshold voltage, and when the voltage of the second detection signal decreases, the hysteresis comparison circuit 02 compares the second detection signal with the second threshold voltage.

[0080] By adopting the above solution, the first threshold voltage is configured through the hysteresis module 022, so that the comparison module 021 not only compares the second detection signal with the second threshold voltage, but also compares the second detection signal with the first threshold voltage, thereby realizing the setting of the hysteresis width of the hysteresis comparison circuit 02.

[0081] According to some embodiments of the present application, optionally, please continue to refer to Figure 3 , Figure 3 A schematic diagram of the structure of a collision signal detection circuit provided by another embodiment of the present application is shown. For ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0082] The first detection signal is a first PWM signal with a preset duty cycle; the second detection signal is a second PWM signal with a preset duty cycle; the above collision signal detection circuit is as follows Figure 1 In addition to all the components and assemblies of the collision signal detection circuit shown, the collision signal detection circuit also includes a first pull-up circuit 04 .

[0083] The first pull-up circuit 04 is connected to the collision sensor 90 and the voltage divider circuit 01 , and is configured to pull up the first detection signal.

[0084] The voltage dividing circuit 01 is specifically configured to divide the voltage of the first PWM signal after being pulled up to output a second PWM signal.

[0085] The hysteresis comparison circuit 02 is specifically configured to compare the second PWM signal with the first threshold voltage and the second threshold voltage to output a comparison signal.

[0086] It should be noted that the first pull-up circuit 04 can not only provide power to the collision sensor 90 with a drain output, but also pull up the first detection signal, thereby amplifying the first detection signal.

[0087] It can be understood that when no collision occurs, the collision sensor 90 outputs a first PWM signal with a first duty cycle, and when a collision occurs, the collision sensor 90 outputs a first PWM signal with a preset duty cycle. At this time, the comparison signal is also the preset duty cycle; wherein the first duty cycle and the preset duty cycle are in a non-overlapping numerical range, and the external control module determines that a collision has occurred and executes a corresponding action when the comparison signal is at the preset duty cycle.

[0088] Since the first detection signal is a first PWM signal with a preset duty cycle, the comparison signal output by the hysteresis comparison circuit 02 after comparing the second PWM signal with the first threshold voltage and the second threshold voltage is also the preset duty cycle. It is possible to determine whether a collision occurs by judging whether the preset duty cycle is within a preset interval. The determination of the preset duty cycle must be based on the existence of a group of continuous PWM signals. Therefore, the influence of accidental interference signals on the final result will be eliminated, thereby further improving the anti-interference performance, and further improving the safety and reliability.

[0089] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 , Figure 4 A schematic diagram of the structure of a collision signal detection circuit provided by another embodiment of the present application is shown. For ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0090] The above collision signal detection circuit is as follows Figure 1In addition to all the components and assemblies of the collision signal detection circuit shown, the collision signal detection circuit also includes a first filtering circuit 05 .

[0091] The first filtering circuit 05 is connected to the voltage dividing circuit 01 and the hysteresis comparison circuit 02 and is configured to filter the second detection signal.

[0092] The hysteresis comparison circuit 02 is specifically configured to compare the filtered second detection signal with the first threshold voltage and the second threshold voltage to output a comparison signal.

[0093] It is understandable that the first filter circuit 05 can be a capacitor component or an RC filter circuit, which is not limited here.

[0094] By filtering the second detection signal, the peak signal in the second detection signal is filtered out, thereby improving the reliability and safety of the collision detection circuit.

[0095] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 , Figure 5 A schematic diagram of the structure of a collision signal detection circuit provided by another embodiment of the present application is shown. For ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0096] The above collision signal detection circuit is as follows Figure 1 In addition to all the components and assemblies of the collision signal detection circuit shown, the collision signal detection circuit also includes a second filtering circuit 06 .

[0097] The second filtering circuit 06 is connected to the control circuit 03 and the hysteresis comparison circuit 02 and is configured to filter the comparison signal.

[0098] It is understandable that the second filter circuit 06 may be a capacitor component or an RC filter circuit, which is not limited here.

[0099] By filtering the comparison signal, the peak signal in the second detection signal is filtered out, thereby improving the reliability and safety of the collision detection circuit.

[0100] According to some embodiments of the present application, optionally, please continue to refer to Figure 6 , Figure 6 A schematic diagram of the structure of a collision signal detection circuit provided by another embodiment of the present application is shown. For ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0101] The above collision signal detection circuit is as follows Figure 1 In addition to all the components and assemblies of the collision signal detection circuit shown, the collision signal detection circuit also includes a second pull-up circuit 07 .

[0102] The second pull-up circuit 07 is connected to the control circuit 03 and the hysteresis comparison circuit 02 and is configured to pull up the comparison signal.

[0103] For the comparison circuit with drain output, the second pull-up circuit 07 can provide power to the comparison circuit and amplify the comparison signal.

[0104] By pulling up the comparison signal, the voltage of the comparison signal is adapted to the voltage of the external control module, thereby improving the reliability and safety of the collision detection circuit.

[0105] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 , Figure 7 A schematic diagram of the structure of a collision signal detection circuit provided by another embodiment of the present application is shown. For ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0106] The above collision signal detection circuit is as follows Figure 1 In addition to all the components and assemblies of the collision signal detection circuit shown, the collision signal detection circuit also includes an electrostatic protection circuit 08.

[0107] The electrostatic protection circuit 08 is connected to the collision sensor 90 and the voltage divider circuit 01 , and is configured to perform electrostatic protection on the first detection signal.

[0108] The voltage divider circuit 01 is specifically configured to divide the voltage of the first detection signal after electrostatic protection to output a second detection signal.

[0109] In specific applications, the electrostatic voltage can reach thousands of volts or even millions of volts, which can cause breakdown damage to the devices in the collision signal detection circuit. When electrostatic discharge occurs, the electrostatic protection circuit 08 quickly introduces the electrostatic current into the ground or other safe discharge paths to reduce the possibility of damage to the devices caused by static electricity.

[0110] By performing electrostatic protection on the first detection signal, the possibility of electrostatic breakdown of the device is reduced, and the service life of the collision detection circuit is increased.

[0111] In some embodiments, optionally, please continue to refer to Figure 8 The comparison module 021 includes a comparator U1, a first resistor R1 and a second resistor R2.

[0112] The non-inverting input terminal of the comparator U1 is connected to the voltage divider circuit 01 as the second detection signal input terminal of the comparison module 021 to receive the second detection signal; the output terminal of the comparator U1 is connected to the first end of the first resistor R1 and the first end of the second resistor R2; the power supply terminal of the comparator U1 is connected to the first power supply VAA, the second end of the second resistor R2 is connected to the second power supply VBB, and the second end of the first resistor R1 and the ground terminal of the comparator U1 are connected to the power ground.

[0113] It can be understood that the first resistor R1 and the second resistor R2 form a reference circuit to provide a second threshold voltage. The comparator U1 compares the second detection signal with the second threshold voltage.

[0114] The comparison circuit is simple and has low cost.

[0115] In some embodiments, optionally, please continue to refer to Figure 8 The hysteresis module 022 includes a first diode D1 and a third resistor R3.

[0116] The cathode of the first diode D1 is connected to the comparison signal output terminal of the comparison module 021 , the first end of the third resistor R3 is connected to the second detection signal input terminal of the comparison module 021 , and the anode of the first diode D1 is connected to the second end of the third resistor R3 .

[0117] When the comparison signal jumps from a low level to a high level, the first diode D1 is turned on and adjusts the first threshold voltage of the configuration comparison circuit, so that the comparator U1 compares the second detection signal with the first threshold voltage to output a comparison signal; when the comparison signal jumps from a high level to a low level, the first diode D1 is turned off and the hysteresis module 022 stops working, so that the comparator U1 compares the second detection signal with the second threshold voltage to output a comparison signal.

[0118] In some embodiments, optionally, please continue to refer to Figure 8 The voltage divider circuit 01 includes a fourth resistor R4 and a fifth resistor R5; a first end of the fourth resistor R4 serves as a first detection signal input end of the voltage divider circuit 01, and is connected to the collision sensing circuit to receive a first detection signal; a second end of the fourth resistor R4 and a first end of the fifth resistor R5 serve together as a second detection signal output end of the voltage divider circuit 01, and are connected to the comparison circuit to output a second detection signal; a second end of the fifth resistor R5 is connected to a power ground.

[0119] When the output of the comparator U1 is about to jump from a high level to a low level, since the output of the comparator U1 is at a high level before the jump, the loop of the first diode D1 and the third resistor R3 is in a cut-off state. At this time, the first voltage threshold Vref1 of the first detection signal is:

[0120] Vref1=(V2*R1 / (R2+R1))*(R4+R5) / R5

[0121] Wherein, V2 is the voltage of the second power supply VBB.

[0122] When the output of the comparator U1 is about to jump from a low level to a high level, since the output of the comparator U1 is at a low level before the jump, the loop of the first diode D1 and the third resistor R3 is in a conducting state. At this time, the second voltage threshold Vref2 of the first detection signal is:

[0123] Vref2=((V2*R1 / (R2+R1)-Vf) / R3+(V2*R1 / (R2+R1)) / R5)*R4+

[0124] V2*R1 / (R2+R1).

[0125] Wherein, V2 is the voltage of the second power supply VBB.

[0126] Thus, the hysteresis module 022 and the comparison module 021 form a hysteresis comparator. Compared with the calculation of the first voltage threshold Vref1, the calculation of the second voltage threshold Vref2 needs to calculate the first diode D1 and the third resistor R3, which is equivalent to adding one path for the current passing through the fourth resistor R4. Therefore, the voltage difference between the second voltage threshold Vref2 of the first detection signal and the first voltage threshold Vref1 is increased. In a specific implementation, the voltage difference between the second voltage threshold Vref2 and the first voltage threshold Vref1 can be changed by adjusting the resistance value of the third resistor R3.

[0127] It should be noted that the collision signal detection circuit further includes a second pull-up circuit 07 , a first filter circuit 05 , a second filter circuit 06 and an electrostatic protection circuit 08 .

[0128] The second pull-up circuit 07 includes a seventh resistor R7.

[0129] The first end of the seventh resistor R7 is connected to the first power supply VAA; the second end of the seventh resistor R7 serves as the pull-up end of the second pull-up circuit 07, connected to the hysteresis comparator circuit 02 and the control circuit 03, so as to access the comparison signal and output the pulled-up comparison signal.

[0130] The first filter circuit 05 includes a first capacitor C1; the first end of the first capacitor C1 serves as a filter end of the first filter circuit 05, and is connected to the voltage divider circuit 01 and the hysteresis comparison circuit 02 to access the second detection signal and output the filtered second detection signal.

[0131] The second filtering circuit 06 includes a second capacitor C2; a first end of the second capacitor C2 serves as a filtering end of the second filtering circuit 06, and is connected to the control circuit 03 and the hysteresis comparison circuit 02 to receive a comparison signal and output a filtered comparison signal.

[0132] The electrostatic protection circuit 08 includes a transient suppression diode TVS1; the first end of the transient suppression diode TVS1 serves as the input end and the output end of the electrostatic protection circuit 08, and is connected to the collision sensor 90 and the voltage divider circuit 01 to access the first detection signal and output the first detection signal after electrostatic protection.

[0133] By connecting the first diode D1 and the third resistor R3 in series, and connecting the first diode D1 and the third resistor R3 in series between the output end of the comparison module 021 and the input end of the comparison module 021, the hysteresis module 022 is turned on and adjusts the first threshold voltage of the configuration comparison circuit only when the comparison signal jumps from a low level to a high level, thereby realizing the setting of the hysteresis width of the hysteresis comparison circuit 02.

[0134] According to some embodiments of the present application, optionally, please continue to refer to Fig. 9 , Fig. 9 A schematic diagram of the structure of a collision signal detection circuit provided by another embodiment of the present application is shown. For ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0135] The above collision signal detection circuit is as follows Figure 8 In addition to all the components and assemblies of the collision signal detection circuit shown, the collision signal detection circuit also includes a first pull-up circuit 04 .

[0136] The first pull-up circuit 04 includes a second diode D2 and a sixth resistor R6.

[0137] The anode of the second diode D2 is connected to the first power supply VAA, and the cathode of the second diode D2 is connected to the first end of the sixth resistor R6; the second end of the sixth resistor R6 serves as the pull-up end of the first pull-up circuit 04, and is connected to the collision sensor 90 and the voltage divider circuit 01 to access the first detection signal and output the first detection signal after being pulled up.

[0138] In a specific implementation, when the collision sensor 90 encounters a collision, it outputs a first PWM signal with a preset duty cycle, the sixth resistor R6 pulls up the first PWM signal, the second diode D2 prevents current backflow, the fourth resistor R4 and the fifth resistor R5 divide the pulled-up first PWM signal to output a second PWM signal with a preset duty cycle, and the hysteresis comparison circuit 02 compares the second PWM signal with the first threshold voltage and the second threshold voltage to output a comparison signal with a preset duty cycle; thereby, the external control module can determine that a collision has occurred and execute corresponding actions when the comparison signal is at the preset duty cycle.

[0139] Since the sixth resistor R6 pulls up the first PWM signal, the second diode D2 prevents current backflow, provides power for the collision sensor 90 output by the drain, amplifies the first PWM signal, and prevents current backflow, thereby further improving safety and reliability.

[0140] According to some embodiments of the present application, the present application further provides a collision protection device, the collision protection device comprising a control circuit and the above-mentioned collision signal detection circuit;

[0141] The control circuit is connected to the collision signal detection circuit and is configured to perform corresponding actions according to the comparison signal.

[0142] The control circuit 03 may include a microprocessor, a digital signal processor (DSP) or a field programmable gate array (FPGA).

[0143] By adopting the above solution, since the collision protection device performs corresponding risk avoidance operations when a collision occurs, safety protection is provided for the car.

[0144] According to some embodiments of the present application, the present application also provides a car, including a collision sensing circuit and a collision signal detection circuit of any of the above solutions.

[0145] Since the automobile includes the collision signal detection circuit of any of the above schemes, the possibility of frequent jitter of the comparison circuit output can be reduced, the anti-interference ability of the comparison circuit is improved, and the safety and reliability of the collision signal detection circuit are improved.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A collision signal detection circuit, characterized in that: connected to a collision sensor, the collision sensor being configured to sense a collision action to output a first detection signal; The collision signal detection circuit comprises: a voltage dividing circuit connected to the collision sensor and configured to divide the first detection signal to output a second detection signal; The hysteresis comparison circuit is connected to the voltage divider circuit and is configured to compare the second detection signal with the first threshold voltage and the second threshold voltage to output a comparison signal.

2. The collision signal detection circuit according to claim 1, characterized in that: The hysteresis comparison circuit comprises: a comparison module, connected to the voltage divider circuit, and configured to compare the second detection signal with the second threshold voltage to output the comparison signal; The hysteresis module is connected to the comparison module and the voltage divider circuit, and is configured to configure the first threshold voltage so that the comparison module further compares the second detection signal with the first threshold voltage to output the comparison signal.

3. The collision signal detection circuit according to claim 2, characterized in that: The comparison module includes a comparator, a first resistor and a second resistor; The non-inverting input terminal of the comparator is used as the second detection signal input terminal of the comparison module, and is connected to the voltage divider circuit to receive the second detection signal; The output end of the comparator serves as a comparison signal output end of the comparison module to output the comparison signal; The inverting input terminal of the comparator is connected to the first end of the first resistor and the first end of the second resistor; The power supply end of the comparator is connected to the first power supply, the second end of the second resistor is connected to the second power supply, and the second end of the first resistor and the ground end of the comparator are connected to the power ground.

4. The collision signal detection circuit according to claim 2, characterized in that: The hysteresis module includes a first diode and a third resistor; The cathode of the first diode is connected to the comparison signal output terminal of the comparison module, the first end of the third resistor is connected to the second detection signal input terminal of the comparison module, and the anode of the first diode is connected to the second end of the third resistor.

5. The collision signal detection circuit according to claim 1, characterized in that: The first detection signal is a first PWM signal with a preset duty cycle; the second detection signal is a second PWM signal with a preset duty cycle; The collision signal detection circuit also includes: a first pull-up circuit, connected to the collision sensor and the voltage divider circuit, and configured to pull up the first detection signal; The voltage dividing circuit is specifically configured to divide the voltage of the first PWM signal after being pulled up to output the second PWM signal; The hysteresis comparison circuit is specifically configured to compare the second PWM signal with the first threshold voltage and the second threshold voltage to output a comparison signal.

6. The collision signal detection circuit according to any one of claims 1 to 5, characterized in that: The collision signal detection circuit also includes: a first filtering circuit, connected to the voltage divider circuit and the hysteresis comparison circuit, and configured to filter the second detection signal; The hysteresis comparison circuit is specifically configured to compare the filtered second detection signal with a first threshold voltage and a second threshold voltage to output the comparison signal.

7. The collision signal detection circuit according to any one of claims 1 to 5, characterized in that: The collision signal detection circuit also includes: The second filtering circuit is connected to the control circuit and the hysteresis comparison circuit, and is configured to filter the comparison signal.

8. The collision signal detection circuit according to any one of claims 1 to 5, characterized in that: The collision signal detection circuit also includes: The second pull-up circuit is connected to the control circuit and the hysteresis comparison circuit, and is configured to pull up the comparison signal.

9. The collision signal detection circuit according to any one of claims 1 to 5, characterized in that: The collision signal detection circuit also includes: an electrostatic protection circuit, connected to the collision sensor and the voltage divider circuit, and configured to perform electrostatic protection on the first detection signal; The voltage divider circuit is specifically configured to divide the voltage of the first detection signal after electrostatic protection to output a second detection signal.

10. A collision protection device, characterized in that: The collision protection device comprises a control circuit and a collision signal detection circuit as claimed in any one of claims 1 to 9; The control circuit is connected to the collision signal detection circuit and is configured to perform corresponding actions according to the comparison signal.

11. A car, characterized in that: The automobile comprises a collision sensor and a collision signal detection circuit as claimed in any one of claims 1 to 9.

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