CN210626557U - Vehicle-mounted power supply voltage detection circuit and vehicle - Google Patents
Vehicle-mounted power supply voltage detection circuit and vehicle Download PDFInfo
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- CN210626557U CN210626557U CN201920962619.9U CN201920962619U CN210626557U CN 210626557 U CN210626557 U CN 210626557U CN 201920962619 U CN201920962619 U CN 201920962619U CN 210626557 U CN210626557 U CN 210626557U
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Abstract
The utility model discloses a vehicle mounted power supply voltage detection circuitry and vehicle, wherein this circuit includes: the overvoltage protection device comprises a vehicle-mounted power supply detection end, an overvoltage pulse absorption unit, a first filtering unit, a voltage detection unit, an anti-reverse connection protection unit, a second filtering unit and a controller which are sequentially connected, wherein the vehicle-mounted power supply detection end is used for being connected with a vehicle-mounted power supply; the overvoltage pulse absorption unit is used for absorbing overvoltage pulses brought by the vehicle-mounted power supply; the voltage detection unit outputs a voltage detection signal by performing voltage detection on the vehicle-mounted power supply; the first filtering unit is used for filtering interference waves input to the voltage detection unit; the reverse connection prevention protection unit is used for preventing the reverse connection of the vehicle-mounted power supply; the second filtering unit is used for filtering interference waves in the voltage detection signal; the controller samples the voltage detection signal through the AD sampling end to obtain the voltage of the vehicle-mounted power supply; therefore, the voltage of the vehicle-mounted power supply is accurately and reliably acquired through the controller, and the circuit is simple and stable and is low in cost.
Description
Technical Field
The utility model relates to the technical field of vehicles, in particular to vehicle power supply voltage detection circuitry and a vehicle.
Background
In the current automobile electronic system, the power supply voltage is usually detected through a power supply voltage detection circuit to analyze whether the circuit is normal, and the existing power supply voltage detection circuit has the risk that related components are damaged because no protective measures are taken for pulse interference of a power supply or the circuit is not simplified enough, so that the complexity is high, and the power supply voltage cannot be accurately detected.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the above-mentioned technology to a certain extent. Therefore, an object of the utility model is to provide an on-vehicle mains voltage detection circuitry, but accurate detection mains voltage, the circuit is simple stable moreover, and is with low costs.
Another object of the present invention is to provide a vehicle.
In order to achieve the above object, an aspect of the present invention provides a vehicle power supply voltage detection circuit, which includes a vehicle power supply detection end, wherein the vehicle power supply detection end is used for connecting a vehicle power supply; the overvoltage pulse absorption unit is connected with the detection end of the vehicle-mounted power supply and is used for absorbing overvoltage pulses brought by the vehicle-mounted power supply; the voltage detection unit is connected with the detection end of the vehicle-mounted power supply and outputs a voltage detection signal by detecting the voltage of the vehicle-mounted power supply; the first filtering unit is arranged on the input side of the voltage detection unit and is used for filtering interference waves input to the voltage detection unit; the reverse connection prevention protection unit is connected with the voltage detection unit and is used for preventing the reverse connection of the vehicle-mounted power supply; the second filtering unit is arranged on the output side of the voltage detection unit and is used for filtering interference waves in the voltage detection signal; and the AD sampling end of the controller is connected with the output end of the voltage detection unit, and the controller samples the voltage detection signal through the AD sampling end to obtain the voltage of the vehicle-mounted power supply.
According to the utility model provides a vehicle power supply voltage detection circuit absorbs the excessive pressure pulse that vehicle power supply brought in through excessive pressure pulse absorption unit, first filter unit and second filter unit filtering interference wave to prevent vehicle power supply reversal through preventing reverse connection protection unit, rethread voltage detection unit carries out voltage detection to vehicle power supply with output voltage detection signal, thereby through the accurate, reliable voltage that acquires vehicle power supply of controller, and the circuit is simple stable, and is with low costs.
In addition, according to the utility model discloses above-mentioned vehicle power supply voltage detection circuit that proposes can also have following additional technical characterstic:
optionally, the voltage detection unit includes a first resistor, one end of the first resistor is connected to the vehicle-mounted power supply detection end, and the other end of the first resistor is connected to the first end of the reverse connection prevention protection unit; one end of the second resistor is connected with the second end of the reverse connection prevention protection unit; and one end of the third resistor is connected with the other end of the second resistor and is provided with a first node, the other end of the third resistor is grounded, and the first node is used as the output end of the voltage detection unit.
Optionally, the reverse connection prevention protection unit includes a first switch tube, a drain of the first switch tube is connected to the other end of the first resistor, and a source of the first switch tube is connected to one end of the second resistor; and one end of the fourth resistor is connected with the grid electrode of the first switching tube, and the other end of the fourth resistor is grounded.
Optionally, the overvoltage pulse absorption unit includes a first transient diode, one end of the first transient diode is connected to the vehicle power supply detection end, and the other end of the first transient diode is grounded.
Optionally, the first filtering unit includes a first capacitor, one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is grounded; a second capacitor connected in parallel with the first capacitor.
Optionally, the second filtering unit includes a third capacitor, one end of the third capacitor is connected to the first node, and the other end of the third capacitor is grounded; a fourth capacitor connected in parallel with the third capacitor.
Optionally, the vehicle power supply voltage detection circuit further includes a protection unit, the protection unit is disposed on an output side of the voltage detection unit, and the protection unit performs pulse impact prevention and electrostatic protection on the output of the voltage detection unit.
Optionally, the protection unit includes a second transient diode, one end of the second transient diode is connected to the output end of the voltage detection unit, and the other end of the second transient diode is grounded; and the anode of the first diode is connected with the other end of the second transient diode and then grounded, and the cathode of the first diode is connected with the output end of the voltage detection unit.
In order to achieve the above object, the present invention provides a vehicle including the vehicle-mounted power supply voltage detection circuit.
According to the utility model provides a vehicle, through foretell vehicle power supply voltage detection circuitry, not only can be effective, accurate collection mains voltage, the circuit is simple stable moreover, and is with low costs.
Drawings
Fig. 1 is a schematic circuit diagram of a vehicle power supply voltage detection circuit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Because the power fluctuation on the vehicle is great, the unable accurate detection mains voltage of current vehicle mounted mains voltage detection circuit to lead to the reliability of circuit low, in order to overcome current defect, the utility model provides a vehicle mounted mains voltage detection circuit, the effectual collection precision that improves mains voltage makes the precision of the mains voltage who gathers can reach 0.2V, and whole circuit is simple stable moreover, required low cost.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1, an embodiment of the present invention provides a vehicle power supply voltage detection circuit, which includes a vehicle power supply detection end a, an overvoltage pulse absorption unit 10, a voltage detection unit 20, a first filtering unit 30, an anti-reverse connection protection unit 40, a second filtering unit 50, and a controller (not shown).
The vehicle power supply detection end A is used for being connected with a vehicle power supply V1.
The overvoltage pulse absorption unit 10 is connected with the vehicle-mounted power supply detection end A, and the overvoltage pulse absorption unit 10 is used for absorbing overvoltage pulses brought by the vehicle-mounted power supply.
Specifically, in an embodiment of the present invention, as shown in fig. 1, the overvoltage pulse absorption unit 10 includes a first transient diode D1, one end of the first transient diode D1 is connected to the vehicle power supply detection terminal a, and the other end of the first transient diode D1 is grounded.
That is, the first transient diode D1 introduces the generated overvoltage pulse to the ground, thereby effectively absorbing the overvoltage pulse on the vehicle.
In the embodiment of the present invention, as shown in fig. 1, the voltage detection unit 20 is connected to the detection terminal a of the vehicle-mounted power supply, and the voltage detection unit 20 detects the voltage to output the voltage detection signal by performing the voltage detection on the vehicle-mounted power supply.
Specifically, as shown in fig. 1, the voltage detection unit 20 includes a first resistor R1, a second resistor R2, and a third resistor R3, one end of the first resistor R1 is connected to the vehicle-mounted power supply detection terminal a, and the other end of the first resistor R1 is connected to the first end of the reverse connection prevention protection unit 40; one end of the second resistor R2 is connected to the second end of the reverse-connection prevention protection unit 40; one end of the third resistor R3 is connected to the other end of the second resistor R2 and has a first node B, the other end of the third resistor R3 is grounded, and the first node B serves as an output terminal of the voltage detection unit 20.
That is, the voltage detection unit 20 performs voltage division conversion by the first resistor R1, the second resistor R2, and the third resistor R3, thereby performing voltage detection on the vehicle power supply to output a voltage detection signal.
In the embodiment of the present invention, as shown in fig. 1, the first filtering unit 30 is disposed on the input side of the voltage detecting unit 20, and the first filtering unit 30 is used for filtering the interference wave input to the voltage detecting unit 20.
Specifically, as shown in fig. 1, the first filter unit 30 includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 is connected to the other end of the first resistor R1, and the other end of the first capacitor C1 is grounded; the second capacitor C2 is connected in parallel with the first capacitor C1.
That is, before entering the voltage detection unit 20, the first filtering unit 30 filters the interference waves input to the voltage detection unit.
In the embodiment of the present invention, as shown in fig. 1, the reverse connection prevention protection unit 40 is connected to the voltage detection unit 20, and the reverse connection prevention protection unit 40 is used to prevent the vehicle-mounted power supply from being connected reversely.
Specifically, as shown in fig. 1, the reverse-connection prevention protection unit 40 includes a first switch Q1 and a fourth resistor R4, a drain (pin No. 3) of the first switch Q1 is connected to the other end of the first resistor R1, and a source (pin No. 2) of the first switch Q1 is connected to one end of the second resistor R2; one end of the fourth resistor R4 is connected to the gate (pin No. 1) of the first switch Q1, and the other end of the fourth resistor R4 is grounded.
It should be noted that, since the first switching tube Q1 has an extremely low internal resistance, the on and off of the switching characteristic control circuit of the first switching tube Q1 can not only prevent the load from being damaged by the reverse connection of the power supply, but also effectively reduce the differential pressure error, thereby improving the detection accuracy of the power supply voltage.
In the embodiment of the present invention, as shown in fig. 1, the second filtering unit 50 is disposed at the output side of the voltage detecting unit 20, and the second filtering unit 50 is used for filtering the interference wave in the voltage detecting signal.
Specifically, as shown in fig. 1, the second filter unit includes a third capacitor C3 and a fourth capacitor C4, one end of the third capacitor C3 is connected to the first node B, and the other end of the third capacitor C1 is grounded; the fourth capacitor C4 is connected in parallel with the third capacitor C3.
That is, the second filtering unit 50 is connected to the output terminal of the voltage detecting unit 20 to filter the interference wave of the voltage detection signal output by the voltage detecting unit 20.
The utility model discloses an in the embodiment, as shown in FIG. 1, the AD sample terminal of controller links to each other with voltage detection unit 20's output, and the controller samples in order to obtain vehicle power supply's voltage through AD sample terminal to voltage detection signal.
The controller 40 may be an MCU, and the AD sampling terminal of the controller is an AD acquisition pin of the MCU.
Specifically, when the power supply is reversely connected, the first switching tube Q1 cannot be conducted, so that the reverse connection prevention function is achieved; when the power is just connecing, first switch tube Q1 switches on, thereby the power on the car carries out the voltage pulse through overvoltage pulse absorption unit 10 and gets into voltage detection through first switch tube Q1 after absorbing thereby output voltage detected signal to supply rear end MCU to do AD collection, thereby the effectual actual voltage that shows the power.
Optionally, in an embodiment of the present invention, as shown in fig. 1, the vehicle power supply voltage detection circuit further includes a protection unit 60, the protection unit 60 is disposed on an output side of the voltage detection unit 20, and the protection unit 60 performs pulse shock prevention and electrostatic protection on the output of the voltage detection unit 20.
Specifically, the protection unit 60 includes a second transient diode D2 and a first diode D3, one end of the second transient diode D2 is connected to the output terminal of the voltage detection unit 20, and the other end of the second transient diode D2 is grounded; the anode of the first diode D3 is connected to the other end of the second transient diode D2 and then grounded, and the cathode of the first diode D3 is connected to the output terminal of the voltage detecting unit 20.
To sum up, according to the utility model provides an on-vehicle power supply voltage detection circuit absorbs the over voltage pulse that on-vehicle power supply brought in through over voltage pulse absorption unit, first filter unit and second filter unit filtering interference wave to prevent the on-vehicle power supply reversal through preventing reverse connection protection unit, rethread voltage detection unit carries out voltage detection with output voltage detection signal to on-vehicle power supply, thereby through the accurate, reliable voltage that acquires on-vehicle power supply of controller, and the circuit is simple stable, with low costs.
The embodiment of the utility model provides a vehicle is still provided, its vehicle power supply voltage detection circuit who includes the description of above-mentioned embodiment.
According to the utility model discloses vehicle, through foretell vehicle power supply voltage detection circuitry, collection mains voltage that not only can be effective, accurate, the circuit is simple stable moreover, and is with low costs.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (9)
1. A vehicle-mounted power supply voltage detection circuit, characterized by comprising:
the vehicle-mounted power supply detection end is used for connecting a vehicle-mounted power supply;
the overvoltage pulse absorption unit is connected with the detection end of the vehicle-mounted power supply and is used for absorbing overvoltage pulses brought by the vehicle-mounted power supply;
the voltage detection unit is connected with the detection end of the vehicle-mounted power supply and outputs a voltage detection signal by detecting the voltage of the vehicle-mounted power supply;
the first filtering unit is arranged on the input side of the voltage detection unit and is used for filtering interference waves input to the voltage detection unit;
the reverse connection prevention protection unit is connected with the voltage detection unit and is used for preventing the reverse connection of the vehicle-mounted power supply;
the second filtering unit is arranged on the output side of the voltage detection unit and is used for filtering interference waves in the voltage detection signal;
and the AD sampling end of the controller is connected with the output end of the voltage detection unit, and the controller samples the voltage detection signal through the AD sampling end to obtain the voltage of the vehicle-mounted power supply.
2. The vehicular power supply voltage detection circuit according to claim 1, wherein the voltage detection unit includes:
one end of the first resistor is connected with the vehicle-mounted power supply detection end, and the other end of the first resistor is connected with the first end of the reverse connection prevention protection unit;
one end of the second resistor is connected with the second end of the reverse connection prevention protection unit;
and one end of the third resistor is connected with the other end of the second resistor and is provided with a first node, the other end of the third resistor is grounded, and the first node is used as the output end of the voltage detection unit.
3. The on-vehicle power supply voltage detection circuit according to claim 2, wherein the reverse-connection prevention protection unit includes:
the drain electrode of the first switch tube is connected with the other end of the first resistor, and the source electrode of the first switch tube is connected with one end of the second resistor;
and one end of the fourth resistor is connected with the grid electrode of the first switching tube, and the other end of the fourth resistor is grounded.
4. The on-vehicle power supply voltage detection circuit according to any one of claims 1 to 3, wherein the overvoltage pulse absorbing unit includes:
and one end of the first transient diode is connected with the vehicle-mounted power supply detection end, and the other end of the first transient diode is grounded.
5. The vehicular power supply voltage detection circuit according to claim 2, wherein the first filter unit includes:
one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is grounded;
a second capacitor connected in parallel with the first capacitor.
6. The vehicular power supply voltage detection circuit according to claim 2, wherein the second filtering unit includes:
one end of the third capacitor is connected with the first node, and the other end of the third capacitor is grounded;
a fourth capacitor connected in parallel with the third capacitor.
7. The vehicular power supply voltage detection circuit according to claim 1, further comprising:
and the protection unit is arranged on the output side of the voltage detection unit and is used for performing pulse impact prevention and electrostatic protection on the output of the voltage detection unit.
8. The on-vehicle power supply voltage detection circuit according to claim 7, wherein the protection unit includes:
one end of the second transient diode is connected with the output end of the voltage detection unit, and the other end of the second transient diode is grounded;
and the anode of the first diode is connected with the other end of the second transient diode and then grounded, and the cathode of the first diode is connected with the output end of the voltage detection unit.
9. A vehicle characterized by comprising the on-vehicle power supply voltage detection circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920962619.9U CN210626557U (en) | 2019-06-25 | 2019-06-25 | Vehicle-mounted power supply voltage detection circuit and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920962619.9U CN210626557U (en) | 2019-06-25 | 2019-06-25 | Vehicle-mounted power supply voltage detection circuit and vehicle |
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| Publication Number | Publication Date |
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| CN210626557U true CN210626557U (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920962619.9U Active CN210626557U (en) | 2019-06-25 | 2019-06-25 | Vehicle-mounted power supply voltage detection circuit and vehicle |
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| CN (1) | CN210626557U (en) |
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- 2019-06-25 CN CN201920962619.9U patent/CN210626557U/en active Active
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