Collision detection circuit for battery management unit

Abstract

A collision detection circuit of a battery management unit (BMU) includes: a reference voltage generator configured to generate a reference voltage in response to a collision signal output from a vehicle being input to the BMU; and a comparator configured to compare the reference voltage generated from the reference voltage generator with a processed collision signal corresponding to the collision signal, and output a collision detection signal in response to the processed collision signal having a duration greater than or equal to a minimum retention time and being at a voltage greater than or equal to the reference voltage.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0144721 filed in the Korean Intellectual Property Office on October 26, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] Aspects of embodiments of the present disclosure relate to a crash detection circuit for a battery management unit. Background Art

[0004] Generally, a vehicle should be designed to protect the bodies of passengers from external accidents and ensure their safety.

[0005] For example, the vehicle detects a collision received from an external object and quickly activates a supplemental restraint system (SRS) (eg, airbag) inside the vehicle based on the received collision to protect passengers.

[0006] Even in electric vehicles, collision detection circuits play a very important role.

[0007] For example, when an external collision occurs while the battery pack outputs high voltage and high current, casualties may occur due to the high voltage and high current. In order to prevent casualties, a collision detection circuit is applied to a battery management unit (BMU) in an electric vehicle, and the collision detection circuit of the BMU detects the occurrence of a collision in the vehicle based on a collision signal (or collision current) sent from the vehicle (e.g., a vehicle electronic control unit (ECU)) to block the battery output (e.g., turn off a relay or actuator to block the battery output).

[0008] However, there is a problem in that even when an abnormal collision signal caused by aging or malfunction of the vehicle (or vehicle component) is input to the collision detection circuit of the BMU, the BMU detects that a normal collision signal is input and performs unnecessary collision response operations (for example, turning off a relay or actuator to prevent battery output).

[0009] The above information disclosed in this Background section is for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute related (or prior) art. Summary of the invention

[0010] Aspects of embodiments of the present disclosure are directed to providing a collision detection circuit for a battery management unit (BMU) that excludes abnormal collision signals sent from a vehicle to the BMU and performs a collision response operation for (eg, only for) normal collision signals.

[0011] Aspects of embodiments of the present disclosure are directed to providing a collision detection circuit of a BMU that allows collision response operations to be performed only for collision signals exceeding preset holding time thresholds and collision current thresholds so as to exclude abnormal collision signals sent from a vehicle to the BMU.

[0012] However, the objects that the present disclosure is intended to achieve are not limited to the above-mentioned objects, and other objects that are not described can be clearly understood by those skilled in the art from the following description.

[0013] According to some embodiments of the present disclosure, a collision detection circuit of a battery management unit (BMU) is provided, the collision detection circuit including: a reference voltage generator configured to generate a reference voltage in response to a collision signal output from a vehicle being input to the BMU; and a comparator configured to compare the reference voltage generated from the reference voltage generator with a processed collision signal corresponding to the collision signal, and output a collision detection signal in response to the processed collision signal having a duration greater than or equal to a minimum holding time and being at a voltage greater than or equal to the reference voltage.

[0014] In some embodiments, the processed collision signal compared to the reference voltage by the comparator corresponds to the collision signal amplified by the amplifier.

[0015] In some embodiments, the collision detection circuit further includes: an amplifier configured to amplify the collision signal with a set gain by receiving the collision signal from the vehicle and generating an amplified collision signal to the reference voltage generator, wherein the processed collision signal corresponds to the amplified collision signal.

[0016] In some embodiments, the reference voltage generator includes a reference voltage generating circuit configured to generate and output a reference voltage in response to the amplified collision signal being output.

[0017] In some embodiments, a reference voltage generating circuit includes: a constant voltage source; a switch having one side connected to the constant voltage source and the other side connected to a plurality of resistors connected in series; and a capacitor having one side connected to a common connection point of the resistors and the other side connected to ground, wherein a reference voltage is output from the common connection point of the plurality of resistors.

[0018] In some embodiments, the reference voltage generator further includes a low pass filter circuit configured to filter the amplified collision signal and generate and output a processed collision signal.

[0019] In some embodiments, the collision detection circuit further includes: a latch configured to latch a collision detection signal output from the comparator, wherein the driving module configured to prevent the output of the battery from being operated by the latched collision detection signal.

[0020] According to some embodiments of the present disclosure, a collision detection circuit of a battery management unit (BMU) is provided, including: a reference voltage generator, configured to generate a reference voltage in response to a collision signal output from a vehicle being input to the BMU; a maximum voltage limiting circuit, configured to limit the maximum voltage of the collision signal output from the vehicle to a set voltage and generate an upper limit (capped) collision signal; and a comparator, configured to compare the reference voltage generated by the reference voltage generator with the upper limit collision signal output by the maximum voltage limiting circuit, and output a collision detection signal in response to the upper limit collision signal having a duration greater than or equal to a minimum holding time and being at a voltage greater than or equal to the reference voltage.

[0021] In some embodiments, the signal input to the maximum voltage limiting circuit corresponds to a collision signal, which is amplified by an amplifier.

[0022] In some embodiments, the amplifier is configured to generate an amplified collision signal by amplifying a collision signal received from the vehicle at a set gain, and output the amplified collision signal to the reference voltage generator.

[0023] In some embodiments, the reference voltage generator includes a reference voltage generating circuit configured to generate and output a reference voltage in response to an upper limit collision signal output from the maximum voltage limiting circuit.

[0024] In some embodiments, a reference voltage generating circuit includes: a first constant voltage source and a second constant voltage source; a switch having one side connected to the first constant voltage source and the other side connected to one side of a third resistor; a first diode having an anode connected to the other side of the third resistor and a cathode connected to one side of a fourth resistor; a second diode having an anode connected to the second constant voltage source and a cathode connected to one side of the fourth resistor; and a capacitor having one side connected to a common connection point of the first diode and the second diode and the fourth resistor and the other side connected to ground, wherein a reference voltage is output from the common connection point of the first diode and the second diode and the fourth resistor.

[0025] In some embodiments, the reference voltage generator further includes a low pass filter circuit configured to filter the upper limit collision signal output from the maximum voltage limit circuit and output the upper limit collision signal.

[0026] In some embodiments, the collision detection circuit further includes: a latch configured to latch a collision detection signal output from the comparator, wherein the driving module configured to prevent the output of the battery from being operated by the latched collision detection signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following drawings attached to this specification illustrate embodiments of the present disclosure and, together with the detailed description of the present disclosure, further describe aspects and features of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the drawings:

[0028] Figure 1A-1B The specification of the crash signal sent from the vehicle to the battery management unit (BMU) is shown.

[0029] Figure 2A-2B is an exemplary schematic diagram for describing a method in which a BMU detects a collision signal received from a vehicle;

[0030] Figure 3 is a schematic block diagram illustrating a collision detection circuit of a BMU according to some embodiments of the present disclosure;

[0031] Figure 4 is a diagram showing the time and the time according to some embodiments of the present disclosure Figure 3 An exemplary schematic diagram of the relationship between voltage levels of signals output by components of a collision detection circuit;

[0032] Figure 5 is a schematic block diagram showing a collision detection circuit of a BMU according to some other embodiments of the present disclosure;

[0033] Figure 6 is a diagram showing the time and the time according to some embodiments of the present disclosure Figure 5 An exemplary schematic diagram of the relationship between voltage levels of signals output by components of a collision detection circuit; and

[0034] Figure 7 is an exemplary schematic diagram illustrating a characteristic curve diagram of a collision detection area of ​​a collision detection circuit of a BMU according to some embodiments of the present disclosure. Specific embodiments

[0035] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The terms or words used in the present specification and claims should not be interpreted as limited to the usual or dictionary meanings, and should be interpreted as meanings and concepts consistent with the technical ideas of the present disclosure based on the principle that the inventor can be his / her own lexicon compiler to appropriately define the concepts of the terms so as to best explain his / her invention.

[0036] The embodiments described in this specification and the configurations shown in the accompanying drawings are only some embodiments of the present disclosure and do not represent all technical ideas, aspects and features of the present disclosure. Therefore, it should be understood that various equivalents and modifications may exist when submitting this application, which may replace or modify the embodiments described herein.

[0037] It should be understood that when an element or layer is referred to as being "on," "connected to," or "coupled to" another element or layer, it may be directly on, directly connected to, or coupled to the other element or layer, or one or more intermediate elements or layers may also be present. When an element or layer is referred to as being "directly on," "directly connected to," or "directly coupled to," there are no intermediate elements or layers. For example, when a first element is described as being "coupled to" or "connected to" a second element, the first element may be directly coupled to or connected to the second element, or the first element may be indirectly coupled to or connected to the second element via one or more intermediate elements.

[0038] In the accompanying drawings, for clarity, the dimensions of various elements, layers, etc. may be exaggerated. The same reference numerals represent the same elements. As used herein, the term "and / or" includes any and all combinations of one or more associated listed items. In addition, when describing the embodiments of the present disclosure, the use of "may" relates to "one or more embodiments of the present disclosure". Expressions such as "at least one of ... " and "any one of ... " modify the entire element list when they are before the element list, without modifying the individual elements in the list. When phrases such as "at least one of A, B and C", "at least one of A, B or C", "at least one of the group selected from A, B and C" or "at least one of A, B and C" are used to specify the list of elements A, B and C, the phrase may refer to any and all suitable combinations or subsets of A, B and C, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the terms "use," "using," and "used" may be considered synonymous with the terms "utilize," "utilizing," and "utilized," respectively. As used herein, the terms "substantially," "approximately," and similar terms are used as terms of approximation rather than terms of degree, and are intended to take into account the inherent variations in measured or calculated values ​​that one of ordinary skill in the art would recognize.

[0039] It should be understood that although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish an element, component, region, layer or part from other elements, components, regions, layers or parts. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer or part discussed below can be referred to as the second element, component, region, layer or part.

[0040] For ease of description, spatially relative terms, such as "below", "below", "lower", "above", "above", etc., may be used herein to describe the relationship between an element or feature as shown in the figure and one or more other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatially relative terms are intended to cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is turned over, the elements described as being "below" or "below" other elements or features will be oriented as being "above" or "above" other elements or features. Therefore, the term "below" can cover both above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0041] The terms used herein are for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure. As used herein, the singular forms "one" and "an" are intended to also include the plural forms, unless the context clearly states otherwise. It will be further understood that when used in this specification, the terms "include", "including", "comprise" and / or "comprising" specify the presence of features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0042] In addition, any numerical range disclosed and / or listed herein is intended to include all sub-ranges of the same numerical precision included in the listed range. For example, the range of "1.0 to 10.0" is intended to include all sub-ranges between the minimum value 1.0 and the maximum value 10.0 (and including endpoints), that is, with a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit described herein is intended to include all lower numerical limits included therein, and any minimum numerical limit described in this specification is intended to include all higher numerical limits included therein. Therefore, the applicant retains the right to modify this specification (including claims) to explicitly describe any sub-ranges included in the scope explicitly described herein. All such ranges are intended to be inherently described in this specification so that the modification of any such sub-ranges explicitly described will meet the requirements.

[0043] Referring to two compared elements, features, etc. as "the same" may mean that they are "substantially the same." Thus, the phrase "substantially the same" may include situations with deviations that are considered low in the art (e.g., 5% or less). Additionally, when a parameter is referred to as being uniform in a given area, it may mean that it is uniform in terms of average value.

[0044] Throughout the specification, unless otherwise specified, each element may be in the singular or in the plural.

[0045] When any element is referred to as being arranged (or located or positioned) "on (or below)" or "over (or under)" a component, it may mean that the arbitrary element is placed in contact with the upper (or lower) surface of the component, and may also mean that other components may be interposed between the component and any arbitrary element arranged (or located or positioned) above (or below) the component.

[0046] Throughout the specification, unless otherwise specified, when "A and / or B" is stated, it means A, B, or A and B. That is, "and / or" includes any or all combinations of the listed multiple items. When "C to D" is stated, it means C or greater and D or less, unless otherwise specified.

[0047] Figure 1A-1B The specifications of the crash signal sent from the vehicle to the battery management unit (BMU) are shown. Figure 1A is a table showing the timing and current value of the collision signal. Figure 1B is a graph showing the time and current value of the collision signal.

[0048] exist Figure 1B The collision detection region shown as a shaded area in represents the minimum time and current specifications for detecting a collision signal.

[0049] Figure 2A-2B is an exemplary schematic diagram for illustrating a method in which a BMU (eg, prior art) detects a collision signal received from a vehicle. Figure 2A is an exemplary schematic diagram showing a detection area where a collision signal is detected by a BMU, and Figure 2B is an exemplary diagram illustrating a reason why a BMU detects (eg, incorrectly identifies) an abnormal collision signal as a normal collision signal.

[0050] exist Figure 2A-2B In the example, the reference voltage Vref has a value converted from a current level to a voltage level. That is, in Figure 2A-2B In the example, the label “Vref” is the current (in amperes) referenced to the voltage Vref.

[0051] like Figure 2B As shown, even when the collision signal transmitted from the vehicle corresponds to area ① (wherein the holding time of the collision signal is, for example, less than 0.5 ms and the value of the collision signal is greater than the value of the reference voltage Vref) or corresponds to area ② (wherein the value of the collision signal is, for example, less than 1.2 A and the holding time of the collision signal is greater than 2 ms), the collision detection circuit of the BMU detects (e.g., incorrectly determines) that a normal collision signal is input, so there is a problem that the collision detection circuit may perform an unexpected and unnecessary impulse response operation.

[0052] This is because the collision detection circuit of the BMU of the prior art may not exclude abnormal collision signals (e.g., abnormal collision signals caused by aging or failure of the vehicle or vehicle components). That is, this is because the collision detection circuit of the BMU detects the input of the collision signal without considering both the holding time threshold and the collision current threshold of the collision signal.

[0053] Figure 3 is a schematic block diagram illustrating a collision detection circuit of a BMU according to some embodiments of the present disclosure.

[0054] refer to Figure 3 , a collision detection circuit of a BMU according to some embodiments includes an amplifier 110 , a reference voltage generator 120 , a comparator 130 , a latch 140 , and a driving module 150 .

[0055] In some embodiments, the amplifier (e.g., an amplifier including an operational amplifier) ​​110 outputs an amplified collision signal Vo_amp obtained by amplifying a collision signal input from the vehicle with a set gain (i.e., by amplifying a voltage detected across (e.g., across) the resistor R1 through which a collision current output by the vehicle flows).

[0056] When the collision signal is amplified by the amplifier 110 , the reference voltage generator 120 generates a reference voltage Vref (which may gradually decrease over time) and outputs it to the amplifier 130 together with the amplified collision signal Vo_amp output from the comparator 110 .

[0057] The reference voltage generator 120 includes a low-pass filter circuit 121 (eg, an RC filter circuit including a resistor R2 and a capacitor C1 ) configured to filter the amplified collision signal Vo_amp output from the amplifier 110 and generate a processed collision signal.

[0058] The reference voltage generator 120 includes a reference voltage generating circuit 122 that generates and outputs a reference voltage Vref when the amplified collision signal Vo_amp is output from the amplifier 110 .

[0059] The reference voltage generating circuit 122 includes a constant voltage source 122a, a switch (e.g., a transistor) 122b, and a capacitor C2, one side of the switch 122b is connected to the constant voltage source 122a, and the other side is connected to a plurality of resistors R3 and R4 connected in series, one side of the capacitor C2 is connected to a common connection point of the plurality of resistors R3 and R4, and the other side is grounded (e.g., connected to a ground reference).

[0060] The reference voltage generating circuit 122 turns off the switch 122b in response to the amplified collision signal Vo_amp output from the amplifier 110, blocks the current output from the constant voltage source 122a when the switch 122b is turned off, and discharges the voltage charged in the capacitor C2 through the fourth resistor R4. Therefore, the reference voltage Vref is output from the common connection point of the plurality of resistors R3 and R4, and the value of the reference voltage Vref gradually decreases over time.

[0061] This has a characteristic of solving the disadvantage of the prior art, that is, when the reference voltage Vref is maintained at a constant voltage, the characteristic of not being able to detect the holding time of the collision signal, which is inversely proportional to the value of the collision signal.

[0062] The comparator 130 compares the reference voltage Vref generated and output from the reference voltage generator 120 with the amplified collision signal Vo_amp output through the amplifier 110, and when the amplified collision signal Vo_amp becomes the reference voltage Vref or more, the output of the comparator 130 is activated and outputs the collision detection signal Vo_com.

[0063] The latch 140 latches the collision detection signal Vo_com output from the comparator 130 .

[0064] According to the collision detection signal Vo_com output from the latch 140 , the driving module 150 is driven to block the output of the battery (eg, block the discharge or output current) (eg, turn off a relay or an actuator to block the output of the battery).

[0065] Figure 4 is a diagram showing the time and the time according to some embodiments of the present disclosure Figure 3 An exemplary schematic diagram of the relationship between the voltage levels of signals output by components of a collision detection circuit.

[0066] refer to Figure 4 , it is assumed that one of two types of collision signals (eg, a first collision signal and a second collision signal) is input from a vehicle to a collision detection circuit of a BMU.

[0067] For ease of description, a first collision signal (e.g., a pulse collision signal at approximately 1.75 A and a duration of approximately 0.5 ms) and a second collision signal (e.g., a pulse collision signal at approximately 1.2 A and a duration of 2 ms) are displayed in separate shaded areas, and both the first collision signal and the second collision signal are assumed to be the processed collision signal Vo_amp after passing through the amplifier 110 and the low-pass filter circuit 121.

[0068] At this time, when the first collision signal is greater than the reference voltage Vref (ie, Figure 4 When a portion of the reference voltage Vref (i.e., the reference voltage Vref that gradually decreases over time) shown by the dotted line in the figure occurs after approximately 0.5ms (for example, as measured from the beginning of the signal), and a portion of the second collision signal that is greater than the reference voltage Vref (i.e., the reference voltage Vref that gradually decreases over time) occurs after approximately 2ms (for example, as measured from the beginning of the signal), because the first collision signal and the second collision signal fully meet the hold time specification of the collision signal described with reference to FIG. 1, the output of the comparator 130 is activated, and therefore the collision detection signal Vo_com is output.

[0069] Figure 5 is a schematic block diagram showing a collision detection circuit of a BMU according to some other embodiments of the present disclosure.

[0070] refer to Figure 5 The collision detection circuit of the BMU according to some embodiments includes an amplifier 110 , a reference voltage generator 170 , a comparator 130 , a latch 140 , a driving module 150 , and a maximum voltage limiting circuit 160 .

[0071] When and according to Figure 3 The collision detection circuit of the BMU of the embodiment is compared according to Figure 5The collision detection circuit of the BMU of the embodiment has a difference in the configuration of the reference voltage generator 170 , and also has the following difference: the collision detection circuit further includes a maximum voltage limiting circuit 160 .

[0072] Therefore, for convenience of description, the description of the repetitive components 110 , 130 , 140 , and 150 may not be repeated, and the following description may mainly focus on the reference voltage generator 170 and the maximum voltage limiting circuit 160 .

[0073] refer to Figure 5 When the amplified collision signal is output through the amplifier 110 , the reference voltage generator 170 generates a reference voltage Vref and outputs it to the comparator 130 together with the amplified collision signal Vo_amp output from the amplifier 110 .

[0074] The reference voltage generator 170 includes a low pass filter circuit 171 configured to filter the amplified collision signal Vo_amp output from the amplifier 110 and generate a processed collision signal.

[0075] The reference voltage generator 170 includes a reference voltage generating circuit 172 that generates and outputs a reference voltage Vref when the amplified collision signal Vo_amp is output from the amplifier 110 or the processed collision signal is output from the low-pass filter circuit 171 .

[0076] The reference voltage generating circuit 172 includes a first constant voltage source 172a, a second constant voltage source 172c, a switch 172b having one side connected to the first constant voltage source 172a and the other side connected to one side of the third resistor R3, a first diode D1 having an anode connected to the other side of the third resistor R3 and a cathode connected to one side of the fourth resistor R4, a second diode D2 having an anode connected to the second constant voltage source 172c and a cathode connected to one side of the fourth resistor R4; and a capacitor C2 having one side connected to a common connection point of the first diode D1 and the second diode D2 and the fourth resistor R4 and the other side connected to ground.

[0077] The maximum voltage limiting circuit 160 is a circuit for limiting the maximum voltage of the output of the amplifier 110 to a set or predetermined voltage (e.g., an upper limit voltage). The maximum voltage limiting circuit 160 sets the output voltage of the amplifier 110 to a voltage Vo_amp_max that operates at the minimum holding time of the collision signal, and prevents the comparator from operating regardless of the value of the collision signal input (e.g., received) before the minimum holding time.

[0078] The maximum voltage limiting circuit 160 may be configured as a discrete circuit, or implemented using a function for limiting the output voltage of the amplifier 110 itself.

[0079] The reference voltage generating circuit 172 turns off the switch 172b in response to the amplified collision signal Vo_amp output from the amplifier 110, and when the switch 172b is turned off, the current output from the first constant voltage source 172a is blocked, and the voltage charged in the capacitor C2 is discharged through the plurality of third resistors R3. Therefore, the reference voltage Vref is output from the common connection point of the first diode D1 and the second diode D2 and the fourth resistor R4, and the value of the reference voltage Vref gradually decreases over time.

[0080] The reference voltage generating circuit 172 connects the first constant voltage source 172a and the second constant voltage source 172c in parallel through the first diode D1 and the second diode D2. The first constant voltage source 172a supplies the maximum reference voltage value Vref_max, at which the reference voltage Vref starts to be released after the collision signal is input, and the second constant voltage source 172c is set to a voltage that operates at the maximum holding time of the collision signal. Therefore, when the discharge of the reference voltage Vref is terminated, the minimum reference voltage value Vref_min is maintained.

[0081] Figure 6 is a diagram showing the time and the time according to some embodiments of the present disclosure Figure 5 An exemplary schematic diagram of the relationship between the voltage levels of signals output by components of a collision detection circuit. Figure 7 is an exemplary schematic diagram illustrating a characteristic curve diagram of a collision detection area of ​​a collision detection circuit of a BMU according to some embodiments of the present disclosure.

[0082] refer to Figure 6 , it is assumed that one of two types of collision signals (eg, a first collision signal and a second collision signal) is input from a vehicle to a collision detection circuit of a BMU.

[0083] For ease of description, the original first collision signal (e.g., a pulse collision signal at approximately 10 A and a duration of approximately 0.4 ms) before the voltage level of the collision signal is limited is shown by a first shaded area ① (i.e., an area including the voltage cutoff portion), and the second collision signal (e.g., a pulse collision signal at approximately 1.15 A and a duration of approximately 100 ms) is shown by a second shaded area ② (i.e., an area including the hold time cutoff portion).

[0084] Here, when the first collision signal is input, the voltage output by the collision signal is limited to the maximum output voltage threshold value Vo_amp_max shown by the dotted line ①-1 after the output of the amplifier passes through the maximum voltage level 110 limiting circuit 160. In this case, because the maximum output voltage threshold value Vo_amp_max is less than the reference voltage Vref when the minimum hold time specification (e.g., about 0.5 ms) is not met, the collision signal having a hold time less than the minimum hold time specification cannot activate the comparator 130 regardless of its value, and thus the collision signal is not detected.

[0085] When the second collision signal is input, the reference voltage of the comparator 130 does not drop to the minimum reference voltage threshold value Vref_min or less by using the second constant voltage source 172c, and the voltage of the collision signal output after passing through the amplifier 110 and the maximum voltage level limiting circuit 160 cannot be higher than the minimum reference voltage threshold value Vref_min as shown by the dotted line ②-1. Therefore, the collision signal having a voltage value less than the minimum voltage specification cannot activate the comparator 130 regardless of the value of its holding time, and the collision signal is not detected.

[0086] In this way, the collision detection circuit of the BMU according to this embodiment has the following features: Figure 7 The characteristics of the collision detection area shown therefore perfectly meet the specifications of the collision signal output from the vehicle described with reference to FIG. 1 .

[0087] As described above, according to some embodiments of the present disclosure, the abnormal collision signal sent from the vehicle to the BMU is excluded (e.g., ignored and no reaction is made to the collision response), and the collision response operation can be performed only for the normal collision signal. In addition, according to some embodiments of the present disclosure, the collision response operation can be performed only for the collision signal exceeding the preset holding time threshold and the collision current threshold, so that the abnormal collision signal sent from the vehicle to the BMU can be excluded (e.g., ignored and no reaction is made to the collision response).

[0088] According to some embodiments of the present disclosure, abnormal collision signals sent from a vehicle to a battery management unit (BMU) may be excluded (eg, ignored and not reacted to with a collision response), and a collision response operation may be performed only for normal collision signals.

[0089] In addition, according to some embodiments of the present disclosure, a collision response operation may be performed only for collision signals exceeding a preset holding time threshold and a collision current threshold, so that abnormal collision signals sent from the vehicle to the BMU may be excluded.

[0090] However, effects that can be achieved by the present disclosure are not limited to the above-described effects, and other effects that are not described can be clearly understood by those skilled in the art from the detailed description.

[0091] It should be understood that the embodiments described herein should be considered illustrative and not for limiting purposes. The description of features or aspects within each embodiment should generally be considered applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope defined by the appended claims and their equivalents.

Claims

1. A collision detection circuit of a battery management unit BMU, comprising: a reference voltage generator configured to generate a reference voltage in response to a collision signal output from the vehicle being input to the BMU; as well as A comparator is configured to compare a reference voltage generated from a reference voltage generator with a processed collision signal corresponding to the collision signal, and output a collision detection signal in response to the processed collision signal having a duration greater than or equal to a minimum hold time and being at a voltage greater than or equal to the reference voltage.

2. The collision detection circuit according to claim 1, wherein: The processed collision signal compared with the reference voltage by the comparator corresponds to the collision signal amplified by the amplifier.

3. The collision detection circuit according to claim 1, further comprising: an amplifier configured to amplify the collision signal with a set gain by receiving the collision signal from the vehicle and generating the amplified collision signal to the reference voltage generator, Therein, the processed collision signal corresponds to the amplified collision signal.

4. The collision detection circuit according to claim 3, wherein: The reference voltage generator includes a reference voltage generating circuit configured to generate and output a reference voltage in response to the amplified collision signal being output.

5. The collision detection circuit according to claim 4, wherein: The reference voltage generating circuit comprises: Constant pressure source; a switch having one side connected to a constant voltage source and the other side connected to a plurality of resistors connected in series; and a capacitor having one side connected to the common connection point of the plurality of resistors and the other side connected to ground, The reference voltage is output from a common connection point of the plurality of resistors.

6. The collision detection circuit according to claim 4, wherein: The reference voltage generator also includes a low pass filter circuit configured to filter the amplified collision signal and generate and output a processed collision signal.

7. The collision detection circuit according to claim 1, further comprising: A latch configured to latch the collision detection signal output from the comparator, Wherein, a driving module configured to block the output of the battery is operated by the latched collision detection signal.

8. A collision detection circuit of a battery management unit (BMU), comprising: a reference voltage generator configured to generate a reference voltage in response to a collision signal output from the vehicle being input to the BMU; a maximum voltage limiting circuit configured to limit a maximum voltage of a collision signal output from the vehicle to a set voltage and generate an upper limit collision signal; as well as A comparator is configured to compare a reference voltage generated by the reference voltage generator with an upper limit collision signal output by the maximum voltage limit circuit, and output a collision detection signal in response to the upper limit collision signal having a duration greater than or equal to a minimum holding time and being at a voltage greater than or equal to the reference voltage.

9. The collision detection circuit according to claim 8, wherein: The signal input to the maximum voltage limiting circuit corresponds to the collision signal amplified by the amplifier.

10. The collision detection circuit according to claim 9, wherein: The amplifier is configured to generate an amplified collision signal by amplifying a collision signal received from the vehicle at a set gain, and output the amplified collision signal to the reference voltage generator.

11. The collision detection circuit according to claim 8, wherein: The reference voltage generator includes a reference voltage generating circuit configured to generate and output a reference voltage in response to an upper limit collision signal output from the maximum voltage limiting circuit.

12. The collision detection circuit according to claim 11, wherein: The reference voltage generating circuit comprises: a first constant pressure source and a second constant pressure source; a switch having one side connected to the first constant voltage source and the other side connected to one side of the third resistor; a first diode having an anode connected to the other side of the third resistor and a cathode connected to one side of the fourth resistor; a second diode having an anode connected to the second constant voltage source and a cathode connected to one side of the fourth resistor; and a capacitor having one side connected to a common connection point of the first diode and the second diode and the fourth resistor and the other side connected to ground, The reference voltage is output from a common connection point of the first diode, the second diode and the fourth resistor.

13. The collision detection circuit according to claim 11, wherein: The reference voltage generator further includes a low-pass filter circuit configured to filter the upper limit collision signal output from the maximum voltage limit circuit and output the upper limit collision signal.

14. The collision detection circuit according to claim 8, further comprising: A latch configured to latch the collision detection signal output from the comparator, Wherein, a driving module configured to block the output of the battery is operated by the latched collision detection signal.

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