CN220964312U - Overvoltage protection circuit, overvoltage protection device and vehicle - Google Patents
Overvoltage protection circuit, overvoltage protection device and vehicle Download PDFInfo
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- CN220964312U CN220964312U CN202322754709.8U CN202322754709U CN220964312U CN 220964312 U CN220964312 U CN 220964312U CN 202322754709 U CN202322754709 U CN 202322754709U CN 220964312 U CN220964312 U CN 220964312U
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Abstract
The application provides an overvoltage protection circuit, an overvoltage protection device and a vehicle. The voltage comparison unit is used for judging whether the voltage of the power supply for the vehicle is over-voltage or not, when the voltage is over-voltage, the voltage comparison unit outputs an over-voltage level signal, and when the over-voltage level signal is received by the time integration unit, filtering and integrating processing is carried out to judge whether the duration of the over-voltage level signal exceeds the preset duration or not, and then the over-voltage duration or a circuit reset signal is output, so that the over-voltage protection circuit can give consideration to error protection and sensitivity. And the output overvoltage duration time passes through the time comparison unit to further judge whether the voltage is actually overvoltage or not, so that the occurrence of error protection is further reduced.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to an overvoltage protection circuit, an overvoltage protection device and a vehicle.
Background
The new energy vehicle generally provides electric energy through a power supply, the electric energy can be converted into power for driving the vehicle to run through a motor, the power stability of the power supply for the vehicle can also be helpful for the reliable running of the vehicle controller, if the power supply voltage of the power supply for the vehicle is over-pressed, the vehicle controller can be damaged to different degrees, and even the vehicle controller can not work, therefore, the new energy vehicle is generally provided with an over-voltage protection circuit to reduce the damage of the over-voltage to the vehicle controller.
However, in the related art, the overvoltage protection circuit cannot simultaneously achieve both the error protection and the sensitivity.
Disclosure of utility model
The application provides an overvoltage protection circuit, an overvoltage protection device and a vehicle, wherein the overvoltage protection circuit can simultaneously consider error protection and sensitivity.
In a first aspect, an embodiment of the present application provides an overvoltage protection circuit, including a voltage comparing unit, a time integrating unit, a time comparing unit, and an overvoltage protection unit. The voltage comparing unit is configured to compare the input voltage with a reference voltage to output an overvoltage level signal in case the input voltage is greater than or equal to the reference voltage. The time integration unit is configured to receive the overvoltage level signal and perform filtering integration processing on the duration of the overvoltage level signal so as to output the overvoltage duration when the duration of the overvoltage level signal is greater than or equal to a preset duration; and outputting a circuit reset signal in case the overvoltage level signal is an interference noise or the duration of the overvoltage level signal is less than a preset duration. The time comparison unit is configured to receive the overvoltage duration and compare the received overvoltage duration with a predetermined time to output an overvoltage protection signal if the overvoltage duration is greater than or equal to the predetermined time; and outputting a duration zero clearing signal if the overpressure duration is less than a predetermined time; and an overvoltage protection unit configured to receive the overvoltage protection signal to disconnect the overvoltage protection unit itself.
In some embodiments of the present application, the voltage comparing unit includes a first voltage regulator, a first triode, and a comparator.
In some embodiments of the application, the time integrating unit comprises a loop filter.
In some embodiments of the present application, the loop filter includes a first filtering module configured to receive the overvoltage level signal and perform a filtering integration process on a duration of the overvoltage level signal to output an overvoltage duration if the duration of the overvoltage level signal is greater than or equal to a preset duration; the first filtering module is configured to receive the overvoltage level signal and perform filtering integration processing on the duration of the overvoltage level signal to output a circuit reset signal if the overvoltage level signal is interference noise or the duration of the overvoltage level signal is less than a preset duration.
In some embodiments of the present application, the first filter module includes a first resistor, a first capacitor, and a second voltage regulator tube; the second filter module includes a second resistor and a second capacitor.
In some embodiments of the application, the second filtering module further comprises a second transistor configured to bleed a voltage of the second capacitor.
In some embodiments of the present application, the time comparison unit includes a third voltage regulator, a third transistor, and a fourth transistor.
In some embodiments of the application, the overvoltage protection unit comprises a single chip microcomputer.
In a second aspect, an embodiment of the present application provides an overvoltage protection device, including the overvoltage protection circuit of the first aspect of the present application.
In a third aspect, an embodiment of the application provides a vehicle comprising the overvoltage protection device of the second aspect of the application.
In the overvoltage protection circuit provided by the embodiment of the application, whether the voltage of the power supply for the vehicle is overvoltage or not is judged by the voltage comparison unit, when the voltage is overvoltage, the voltage comparison unit outputs an overvoltage level signal, and the overvoltage level signal is filtered and integrated when being received by the time integration unit so as to judge whether the duration of the overvoltage level signal exceeds the preset duration, and then the overvoltage duration or a circuit reset signal is output, so that the overvoltage protection circuit can give consideration to error protection and sensitivity. And the output overvoltage duration time passes through the time comparison unit to further judge whether the voltage is actually overvoltage or not, so that the occurrence of error protection is further reduced.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:
Fig. 1 is a schematic flow diagram of an overvoltage protection circuit according to some embodiments of the present application;
FIG. 2 is a schematic diagram of an overvoltage protection circuit according to some embodiments of the present application;
FIG. 3 is a schematic diagram showing the structure of a voltage comparing unit of the overvoltage protection circuit in FIG. 2;
FIG. 4 is a schematic diagram showing the structure of a time integrating unit of the overvoltage protection circuit in FIG. 2;
FIG. 5 is a schematic diagram showing the structure of a time comparison unit of the overvoltage protection circuit in FIG. 2;
fig. 6 is a schematic diagram of an overvoltage protection circuit according to other embodiments of the present application.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.
In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the description of embodiments of the present application, unless explicitly stated and limited otherwise, the term "connected" and the like should be construed broadly, and may be, for example, electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two parts or interaction relationship between the two parts. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
As described in the background art, the overvoltage may cause the vehicle controller to be damaged to various degrees, and may even disable the vehicle controller, and the overvoltage protection circuit may protect the vehicle controller.
However, in the related art, the overvoltage protection circuit may have error protection, so that the reset response of the circuit is slow, and multiple disturbances may have an accumulation effect, and even cause the controller to stop working. Therefore, there is a need to develop an overvoltage protection circuit that combines both error protection and sensitivity.
In view of this, the present application provides an overvoltage protection circuit, an overvoltage protection device, and a vehicle, which can simultaneously give consideration to both error protection and sensitivity.
Overvoltage protection circuit
Preferred embodiments of the overvoltage protection circuit according to the present disclosure are specifically described below with reference to the accompanying drawings. Fig. 1 is a schematic flow diagram of an overvoltage protection circuit according to some embodiments of the present application; FIG. 2 is a schematic diagram of an overvoltage protection circuit according to some embodiments of the present application; FIG. 3 is a schematic diagram showing the structure of a voltage comparing unit of the overvoltage protection circuit in FIG. 2; FIG. 4 is a schematic diagram showing the structure of a time integrating unit of the overvoltage protection circuit in FIG. 2; FIG. 5 is a schematic diagram showing the structure of a time comparison unit of the overvoltage protection circuit in FIG. 2; fig. 6 is a schematic diagram of an overvoltage protection circuit according to other embodiments of the present application.
Referring to fig. 1 to 6, an embodiment of the present application provides an overvoltage protection circuit, which includes a voltage comparing unit, a time integrating unit, a time comparing unit and an overvoltage protection unit. The voltage comparing unit is configured to compare the input voltage with a reference voltage to output an overvoltage level signal in case the input voltage is greater than or equal to the reference voltage. The time integration unit is configured to receive the overvoltage level signal and perform filtering integration processing on the duration of the overvoltage level signal so as to output the overvoltage duration when the duration of the overvoltage level signal is greater than or equal to a preset duration; and outputting a circuit reset signal in case the overvoltage level signal is an interference noise or the duration of the overvoltage level signal is less than a preset duration. The time comparison unit is configured to receive the overvoltage duration and compare the received overvoltage duration with a predetermined time to output an overvoltage protection signal if the overvoltage duration is greater than or equal to the predetermined time; and outputting a duration zero clearing signal if the overpressure duration is less than a predetermined time; and an overvoltage protection unit configured to receive the overvoltage protection signal to disconnect the overvoltage protection unit itself.
In the overvoltage protection circuit provided by the embodiment of the application, whether the voltage of the power supply for the vehicle is overvoltage or not is judged by the voltage comparison unit, when the voltage is overvoltage, the voltage comparison unit outputs an overvoltage level signal, and the overvoltage level signal is filtered and integrated when being received by the time integration unit so as to judge whether the duration of the overvoltage level signal exceeds the preset duration, and then the overvoltage duration or a circuit reset signal is output, so that the overvoltage protection circuit can give consideration to error protection and sensitivity. And the output overvoltage duration time passes through the time comparison unit to further judge whether the voltage is actually overvoltage or not, so that the occurrence of error protection is further reduced.
Referring to fig. 1 and 2, in some embodiments of the present application, the voltage comparing unit includes a first voltage regulator, a first triode, and a comparator.
The first voltage regulator may be a voltage regulator diode well known in the art, which uses a reverse breakdown state of a PN junction to enable its current to be changed in a wide range without substantially changing the voltage, so in the above embodiment, the first voltage regulator D1 can be used as a voltage reference element. The first transistor Q1 may be a PNP transistor for open circuit. The comparator can compare the input voltage with a reference voltage, when the input voltage Vin is greater than D1+VD (D1 is the reference voltage formed by the first voltage stabilizing tube, VD is the voltage drop of the base electrode (B pole) and the emitter electrode (E pole) in the first triode), the overvoltage voltage value output by the voltage comparison unit is changed from 0V to about (R7/(R7+R8))× (Vin-0.2) V, wherein 0.2V is the saturation voltage drop of the collector electrode (C pole) and the emitter electrode (E pole) in the first triode. When the input voltage Vin is smaller than D1, the overvoltage voltage value output by the voltage comparison unit is 0V, which can be understood that the voltage comparison unit does not act, i.e. no current loop exists, so that the energy consumption of the overvoltage protection circuit can be reduced.
In some embodiments of the application, the time integrating unit comprises a loop filter. In an embodiment of the application, the loop filter is capable of attenuating not only high frequency error components to improve interference immunity, but also improving the loop for short-term storage and quickly recovering the signal. This can further reduce the probability of false protection occurrence and improve sensitivity.
Further, the loop filter may be an RC integration filter. As shown in fig. 1, R3 is used for pull-up and C2 is used for RC response time.
In some embodiments of the present application, the loop filter includes a first filtering module configured to receive the overvoltage level signal and perform a filtering integration process on a duration of the overvoltage level signal to output an overvoltage duration if the duration of the overvoltage level signal is greater than or equal to a preset duration; the first filtering module is configured to receive the overvoltage level signal and perform filtering integration processing on the duration of the overvoltage level signal to output a circuit reset signal if the overvoltage level signal is interference noise or the duration of the overvoltage level signal is less than a preset duration.
Specifically, as shown in FIG. 2, V1 is used as an input voltage, R5-R6 may be used for pull-up, Q3 may be used as a switch, and R7-R8 may be used for voltage division.
Referring to fig. 3 and 4, in some embodiments of the present application, the first filtering module includes a first resistor R4, a first capacitor C3, and a second voltage regulator D2, and the second filtering module includes a second resistor R9 and a second capacitor C4.
In the above embodiment, when an overvoltage event exists, the time integrating unit receives the overvoltage level signal, and the first filtering module forms the overvoltage duration detection logic through the first resistor R4 and the first capacitor C3, so as to filter out the interference signal and reduce the occurrence of error protection; when the overvoltage event continuously exists, the voltage of the end C3 of the first capacitor continuously increases, and the overvoltage duration is output under the condition that the duration of the overvoltage level signal is greater than or equal to the preset duration, so that the duration count is realized.
With continued reference to fig. 4, in some embodiments of the present application, the second filtering module further includes a second transistor Q4, and the second transistor Q4 is configured to bleed the voltage C4 of the second capacitor. When the overvoltage level signal received by the time integration unit is interference noise or the fault duration is not satisfied, the voltage of the end of the second capacitor C3 is rapidly released through the second triode Q4, and the circuit is reset so as to prepare for next fault detection.
In the above embodiments, the filter time constant formed by the first resistor R4 and the first capacitor C3 is greater than the filter time constant formed by the second resistor R9 and the second capacitor C4, and it is understood that the filter time constant formed by the first resistor R4 and the first capacitor C3 is greater, so that noise interference can be filtered and longer counting can be achieved. The filter time constant formed by the second resistor R9 and the second capacitor C4 is smaller, so that the circuit can be quickly reset, and the accumulation effect of multiple interference signals can be eliminated. Therefore, by adopting different RC filter parameters, the compatibility of error protection and sensitivity can be further realized.
In the overvoltage protection circuit shown in fig. 4, R9-C4 can be used for delay, Q4 can act as a switch, and R10 is connected with the B pole of Q4 to form a loop.
Referring to fig. 5, in some embodiments of the present application, the time comparison unit includes a third voltage regulator D3, a third transistor Q2, and a fourth transistor Q6. And if the duration of the overvoltage event is greater than or equal to the preset time, the equivalent voltage of the overvoltage duration is greater than D1+VD, the third triode Q2 acts, the fourth triode Q6 acts, and the overvoltage event is fed back to the overvoltage containing unit to execute corresponding protection action. If the duration of the over-voltage event is less than the predetermined time, the time count is cleared, even though the voltage of the RC circuit is cleared.
In the overvoltage protection circuit shown in fig. 5, D3 can be used to protect Q2, R14 for pull-down, R13-R12 for pull-up, Q6 can act as a switch, C5 for delay, and R14 for pull-down.
In some embodiments of the application, the overvoltage protection unit comprises a single chip microcomputer.
In the embodiments, the overvoltage protection circuit adopts a passive device design, so that devices are fewer, the space requirement of a controller is reduced, and the miniaturization of products is facilitated. And the cost of the overvoltage protection circuit designed by the passive device is lower, which is beneficial to the cross-industry application of the overvoltage protection circuit. In addition, in the state of not triggering the protection threshold value, the overvoltage protection circuit is in a dormant state, so that the requirement of low power consumption is met.
As shown in FIG. 6, in the overvoltage protection circuit, R5-R6 are used for pulling up, Q3 can play a role of switching, R7-R8 are used for dividing voltage, D1 is used for stabilizing voltage, D2 is used for protecting Q7, R9-C4 are used for delaying, D3 is used for protecting Q2, R13-R12 are used for pulling up, Q6 can play a role of switching, C5 is used for delaying, and R11 and the B pole phase edge of D2 form a loop.
Overvoltage protection device
The embodiment of the application provides an overvoltage protection device, which comprises the overvoltage protection circuit in any one of the embodiments.
In the embodiment of the present application, since the overvoltage protection device includes the overvoltage protection circuit in the above embodiment, the overvoltage protection device also has the technical effects of the overvoltage protection circuit, and the embodiments of the present application are not described herein.
Vehicle with a vehicle body having a vehicle body support
The embodiment of the application provides a vehicle, which comprises the overvoltage protection device in the embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. An overvoltage protection circuit, comprising:
A voltage comparing unit configured to compare an input voltage with a reference voltage to output an overvoltage level signal if the input voltage is greater than or equal to the reference voltage;
The time integration unit is configured to receive the overvoltage level signal, and the duration of the overvoltage level signal is subjected to filtering integration processing so as to output overvoltage duration when the duration of the overvoltage level signal is greater than or equal to a preset duration; outputting a circuit reset signal when the overvoltage level signal is interference noise or the duration of the overvoltage level signal is smaller than a preset duration;
A time comparison unit configured to receive the overvoltage duration and compare the received overvoltage duration with a predetermined time to output an overvoltage protection signal if the overvoltage duration is greater than or equal to the predetermined time; and outputting a duration zero signal if the overpressure duration is less than the predetermined time;
an overvoltage protection unit configured to receive the overvoltage protection signal to disconnect the overvoltage protection unit itself.
2. The overvoltage protection circuit of claim 1, wherein the voltage comparison unit comprises a first voltage regulator tube, a first triode, and a comparator.
3. The overvoltage protection circuit of claim 1, wherein the time integrating unit comprises a loop filter.
4. The overvoltage protection circuit of claim 3 wherein said loop filter comprises:
The first filtering module is configured to receive the overvoltage level signal, and perform filtering integration processing on the duration of the overvoltage level signal so as to output overvoltage duration when the duration of the overvoltage level signal is greater than or equal to a preset duration;
And the second filtering module is configured to receive the overvoltage level signal, and filter and integrate the duration of the overvoltage level signal to output a circuit reset signal when the overvoltage level signal is interference noise or the duration of the overvoltage level signal is smaller than a preset duration.
5. The overvoltage protection circuit of claim 4, wherein the first filter module comprises a first resistor, a first capacitor, and a second voltage regulator tube;
The second filter module includes a second resistor and a second capacitor.
6. The overvoltage protection circuit of claim 5, wherein the second filter module further comprises a second transistor configured to bleed a voltage of the second capacitor.
7. The overvoltage protection circuit of claim 1, wherein the time comparison unit includes a third voltage regulator, a third transistor, and a fourth transistor.
8. The overvoltage protection circuit of claim 1, wherein the overvoltage protection unit comprises a single chip microcomputer.
9. An overvoltage protection device comprising an overvoltage protection circuit according to any one of claims 1-8.
10. A vehicle comprising an overvoltage protection device according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322754709.8U CN220964312U (en) | 2023-10-13 | 2023-10-13 | Overvoltage protection circuit, overvoltage protection device and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322754709.8U CN220964312U (en) | 2023-10-13 | 2023-10-13 | Overvoltage protection circuit, overvoltage protection device and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN220964312U true CN220964312U (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322754709.8U Active CN220964312U (en) | 2023-10-13 | 2023-10-13 | Overvoltage protection circuit, overvoltage protection device and vehicle |
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| CN (1) | CN220964312U (en) |
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- 2023-10-13 CN CN202322754709.8U patent/CN220964312U/en active Active
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