CN214823082U - Power supply awakening module of automobile instrument - Google Patents
Power supply awakening module of automobile instrument Download PDFInfo
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- CN214823082U CN214823082U CN202120562983.3U CN202120562983U CN214823082U CN 214823082 U CN214823082 U CN 214823082U CN 202120562983 U CN202120562983 U CN 202120562983U CN 214823082 U CN214823082 U CN 214823082U
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Abstract
The application discloses a power supply awakening module of an automobile instrument, which comprises an automobile storage battery, a comparison circuit, a voltage division circuit, an operational amplifier and a controllable power supply chip, wherein a negative control awakening source is arranged in the comparison circuit, the operational amplifier comprises a positive input end, a negative input end and an operational amplifier output end, the comparison circuit is connected with the negative input end and inputs comparison voltage, the negative control awakening source can control the magnitude of the comparison voltage, the voltage division circuit is connected with the negative input end and inputs the division voltage, the controllable power supply chip is provided with a power supply control end and a chip output end, the operational amplifier output end is connected with the power supply control end, after the comparison voltage and the division voltage are compared in the operational amplifier, the comparison result is input into the power supply control end from the operational amplifier output end, the power supply control end can control the output voltage of the chip, the power supply awakening module uses negative control to awaken, safety and reliability, the possibility of danger caused by large current generated in the awakening process is avoided.
Description
Technical Field
The application relates to the technical field of automobile instruments, in particular to a power supply awakening module of an automobile instrument.
Background
After the automobile is dormant, the automobile is usually awakened through high-level signals such as an ignition switch, a danger signal switch, a charging signal switch and the like, and the high-level awakening mode is called positive control awakening; if the instrument is woken up by a ground signal, the mode of ground wake-up is called negative control wake-up.
However, the conventional power wake-up method has the following defects: when using positive control wake-up, wake-up is performed by a high level voltage, which is present on the wake-up line, and if a short circuit to ground occurs, an unsafe situation may occur.
Disclosure of Invention
An object of this application is to provide a power wake-up module of a motormeter with a safe and reliable wake-up process.
In order to achieve the above purposes, the technical scheme adopted by the application is as follows: a power supply awakening module of an automobile instrument comprises an automobile storage battery, a comparison circuit, a voltage division circuit, an operational amplifier and a controllable power supply chip, wherein the automobile storage battery is electrically connected with the comparison circuit, the voltage division circuit, the operational amplifier and the controllable power supply chip respectively, a negative control awakening source is arranged in the comparison circuit, the operational amplifier comprises a positive input end, a negative input end and an operational amplifier output end, the comparison circuit is connected with the negative input end and inputs comparison voltage, the negative control awakening source can control the size of the comparison voltage, the voltage division circuit is connected with the negative input end and inputs divided voltage, a power supply control end and a chip output end are arranged on the controllable power supply chip, the operational amplifier output end is connected with the power supply control end, and the comparison voltage and the divided voltage are compared in the operational amplifier, and inputting the comparison result into the power supply control end from the operational amplifier output end, wherein the power supply control end can control the output voltage of the chip output end at the moment.
Specifically, the comparison circuit comprises a resistor R1 and a resistor R2, the resistor R1 and the resistor R2 are electrically connected between the automobile storage battery and the negative input end, and the negative control wake-up source is arranged between the resistor R1 and the resistor R2 in parallel.
Specifically, bleeder circuit includes resistance R3 and resistance R4, resistance R3 electric connection in the vehicle battery with between the positive input end, resistance R4 be in parallel in resistance R3 with between the positive input end, resistance R4 one end ground connection sets up.
As an improvement, a resistor R5 and a triode are connected in series between the operational amplifier output end and the power supply control end, and one end of the triode is grounded.
As an improvement, when the number of the negative control wake-up sources is multiple, one end of each negative control wake-up source is connected in series with a unidirectional diode and then connected in parallel.
In an improvement, a filter capacitor C1 is connected in parallel between the resistor R2 and the negative input end, and one end of the filter capacitor C1 is grounded.
As a modification, a filter capacitor C2 is connected in parallel between the resistor R3 and the positive input end, and one end of the filter capacitor C2 is grounded.
Compared with the prior art, the beneficial effect of this application lies in: change the awakening process into burden accuse awakening, it is the ground signal to awaken up the instrument and use, because the size of ground current only has several milliamperes or lower, the awakening process will become more safe and reliable, danger such as short circuit is difficult to take place, when the source ground connection is awaken up in burden accuse, operational amplifier continues the output high level, when the source trigger is awaken up in burden accuse, through operational amplifier's conversion, exportable low level to controllable power supply chip, the burden accuse awakens up and can be used for situations such as danger signal switch, door opening signal switch, emergency valve switch and go to awaken up the instrument.
Drawings
Fig. 1 is a schematic diagram of a circuit configuration according to a preferred embodiment of the present application.
In the figure: 1. an automotive battery; 2. a comparison circuit; 3. a voltage dividing circuit; 4. an operational amplifier; 41. a positive input end; 42. a negative input terminal; 43. an operational amplifier output end; 5. a controllable power supply chip; 51. a power supply control terminal; 52. a chip output end; 6. a negative control wake-up source; 61. a diode; 7. and a triode.
Detailed Description
The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present application is further described with reference to the accompanying drawings:
as shown in fig. 1, a preferred embodiment of the present application includes an automobile battery 1, a comparison circuit 2, a voltage dividing circuit 3, an operational amplifier 4 and a controllable power chip 5, where the automobile battery 1 is electrically connected to the comparison circuit 2, the voltage dividing circuit 3, the operational amplifier 4 and the controllable power chip 5, the comparison circuit 2, the voltage dividing circuit 3, the operational amplifier 4 and the controllable power chip 5 are all connected to the positive electrode of the automobile battery 1, and the automobile battery 1 supplies power through a normally live wire, so that the automobile battery can maintain a normally charged state when the automobile is turned off, the circuit and the components can maintain an uninterruptible operation, and the voltage output by the positive electrode of the automobile battery 1 is usually 24V or 12V.
The comparison circuit 2 is provided with a negative control wake-up source 6, the input of the operational amplifier 4 can be changed by utilizing the state change of the negative control wake-up source 6, and after the comparison with the input of the voltage division circuit 3, different signals can be output from the operational amplifier 4 to control the voltage output of the controllable power supply chip 5.
The comparison circuit 2 is provided with a negative control wake-up source 6, the operational amplifier 4 comprises a positive input terminal 41, a negative input terminal 42 and an operational amplifier output terminal 43, the comparison circuit 2 is connected with the negative input terminal 42 and inputs a comparison voltage, the negative control wake-up source 6 can control the magnitude of the comparison voltage, the voltage division circuit 3 is connected with the negative input terminal 42 and inputs a division voltage, the controllable power supply chip 5 is provided with a power supply control terminal 51 and a chip output terminal 52, the operational amplifier output terminal 43 is connected with the power supply control terminal 51, the comparison voltage and the division voltage are compared in the operational amplifier 4, then the comparison result is input into the power supply control terminal 51 from the operational amplifier output terminal 43, the state of the power supply control terminal 51 is divided into ON and OFF, when the signal is high level, the state of the power supply control terminal 51 is OFF, the controllable power supply chip 5 does not operate, when the signal is low level, the state of the power supply control terminal 51 is ON, the power control terminal 51 can control the output voltage of the chip output terminal 52.
The comparison circuit 2 comprises a resistor R1 and a resistor R2, the resistor R1 and the resistor R2 are arranged between the automobile storage battery 1 and the negative input end 42, and the negative control awakening source 6 is connected between the resistor R1 and the resistor R2 in parallel.
The voltage dividing circuit 3 includes a resistor R3 and a resistor R4, the resistor R3 is disposed between the automobile battery 1 and the positive input end 41, the resistor R4 is connected in parallel between the resistor R3 and the positive input end 41, and one end of the resistor R4 is grounded.
The functions of R1, R2, R3 and R4 are mainly to divide the voltage.
Since the input voltage of the voltage divider circuit 3 at the positive input terminal 41 is divided by the resistor R4, the voltage at the positive input terminal 41 is a divided voltage and is smaller than the voltage of the vehicle battery 1; when the negative control wake-up source 6 is grounded, the negative input end 42 of the operational amplifier 4 is a low-level voltage, the voltage of the positive input end 41 of the operational amplifier 4 is a divided voltage of the voltage output by the anode of the automobile storage battery 1, the voltage of the negative input end 42 is smaller than the voltage of the positive input end 41, and at this time, the operational amplifier 4 outputs a high level; when the negative control wake-up source 6 is not grounded, the voltage at the negative input end 42 of the operational amplifier 4 is the voltage output by the positive pole of the automobile storage battery 1, the voltage at the positive input end 41 of the operational amplifier 4 is the divided voltage of the voltage output by the positive pole of the automobile storage battery 1, the voltage at the negative input end 42 is greater than the voltage at the positive input end 41, and at this time, the operational amplifier 4 outputs a low level.
A resistor R5 and a triode 7 are connected in series between the operational amplifier output end 43 and the power control end 51, one end of the triode 7 is grounded, the triode 7 is mainly used for amplifying signals output by the operational amplifier 4 and ensuring that the controllable power supply chip 5 can receive the signals, and the resistor R5 is used for preventing the operational amplifier 4 and the controllable power supply chip 5 from being damaged due to overlarge voltage in the circuit.
When the number of the negative control awakening sources 6 is multiple, one end of each negative control awakening source 6 is connected with the one-way diode 61 in series and then connected in parallel, and the design can enable different negative control awakening sources 6 to share one voltage comparison circuit 2.
A filter capacitor C1 is connected in parallel between the resistor R2 and the negative input end 42, and one end of the filter capacitor C1 is grounded.
A filter capacitor C2 is connected in parallel between the resistor R3 and the positive input end 41, and one end of the filter capacitor C2 is grounded.
The filter capacitor C1 and the filter capacitor C2 can enable the output current to be more smooth and stable, and reduce the influence of current fluctuation on the operation of the awakening module.
The VC ends of the operational amplifier 4 and the controllable power supply chip 5 are connected with the automobile storage battery 1, and the GND ends of the operational amplifier 4 and the controllable power supply chip 5 are grounded.
In addition, the filter capacitor C1, the filter capacitor C2, the resistor R4 and the triode 7 are grounded, and the grounding in the automobile electrical appliance means that the negative electrodes of the storage battery and the circuit are connected with a metal frame of the automobile body, and the automobile body replaces a lead wire to form the circuit.
The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.
Claims (7)
1. The utility model provides a power awakening module of motormeter which characterized in that: the automobile storage battery is electrically connected with the comparison circuit, the voltage division circuit, the operational amplifier and the controllable power supply chip respectively, a negative control awakening source is arranged in the comparison circuit, the operational amplifier comprises a positive input end, a negative input end and an operational amplifier output end, the comparison circuit is connected with the negative input end and inputs comparison voltage, the negative control awakening source can control the comparison voltage, the voltage division circuit is connected with the negative input end and inputs divided voltage, a power supply control end and a chip output end are arranged on the controllable power supply chip, the operational amplifier output end is connected with the power supply control end, after the comparison voltage and the divided voltage are compared in the operational amplifier, a comparison result is input into the power supply control end from the operational amplifier output end, at this time, the power control terminal can control the output voltage of the chip output terminal.
2. The power wake-up module of the automobile instrument as claimed in claim 1, wherein: the comparison circuit comprises a resistor R1 and a resistor R2, the resistor R1 and the resistor R2 are electrically connected between the automobile storage battery and the negative input end, and the negative control awakening source is arranged between the resistor R1 and the resistor R2 in parallel.
3. The power wake-up module of the automobile instrument as claimed in claim 1, wherein: the bleeder circuit includes resistance R3 and resistance R4, resistance R3 electric connection in the vehicle battery with between the positive input, resistance R4 connect in parallel in resistance R3 with between the positive input, resistance R4 one end ground connection sets up.
4. The power wake-up module of the automobile instrument as claimed in claim 1, wherein: and a resistor R5 and a triode are connected in series between the operational amplifier output end and the power control end, and one end of the triode is grounded.
5. The power wake-up module of the automobile instrument as claimed in claim 2, wherein: when the number of the negative control awakening sources is multiple, one end of each negative control awakening source is connected with a unidirectional diode in series and then connected in parallel.
6. The power wake-up module of the automobile instrument as claimed in claim 2, wherein: a filter capacitor C1 is connected between the resistor R2 and the negative input end in parallel, and one end of the filter capacitor C1 is grounded.
7. The power wake-up module of the automobile instrument as claimed in claim 3, wherein: a filter capacitor C2 is connected in parallel between the resistor R3 and the positive input end, and one end of the filter capacitor C2 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120562983.3U CN214823082U (en) | 2021-03-18 | 2021-03-18 | Power supply awakening module of automobile instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120562983.3U CN214823082U (en) | 2021-03-18 | 2021-03-18 | Power supply awakening module of automobile instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214823082U true CN214823082U (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120562983.3U Active CN214823082U (en) | 2021-03-18 | 2021-03-18 | Power supply awakening module of automobile instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214823082U (en) |
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2021
- 2021-03-18 CN CN202120562983.3U patent/CN214823082U/en active Active
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