CN215871171U - Power supply protection circuit applied to agricultural machinery traveling computer - Google Patents
Power supply protection circuit applied to agricultural machinery traveling computer Download PDFInfo
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- CN215871171U CN215871171U CN202121320125.4U CN202121320125U CN215871171U CN 215871171 U CN215871171 U CN 215871171U CN 202121320125 U CN202121320125 U CN 202121320125U CN 215871171 U CN215871171 U CN 215871171U
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Abstract
The utility model discloses a power supply protection circuit applied to a traveling computer of agricultural machinery, which comprises: the agricultural machinery driving computer circuit is connected with the input power supply through the switch circuit, and a first power supply protection circuit and a second power supply protection circuit are connected between the agricultural machinery driving computer circuit and the input power supply in parallel; the input end of the switch control circuit is connected with the agricultural machinery traveling computer circuit, and the output end of the switch control circuit is connected with the switch circuit; the switch control circuit comprises a reference voltage acquisition circuit, a temperature-change voltage acquisition circuit and a comparison circuit; the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are connected in parallel, the input ends of the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are respectively connected with the agricultural machinery driving computer circuit, the output ends of the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are respectively connected with the comparison circuit, and the comparison circuit is connected with the switch circuit. The circuit structure is simple, and the computer circuit of the agricultural machinery traveling crane can be effectively protected.
Description
Technical Field
The utility model relates to the technical field of agricultural machinery driving computer protection, in particular to a power supply protection circuit applied to an agricultural machinery driving computer.
Background
Along with the continuous development of agricultural machinery performance, more and more points need to be monitored on agricultural machinery, and the traditional instrument system can not meet the requirement of the agricultural machinery which is developed increasingly, so that the intelligent display of the agricultural machinery through an agricultural machinery driving computer is imperative. However, the whole circuit of the agricultural machinery traveling computer is easily damaged due to the fault of the input power supply, so that the traveling fault of the agricultural machinery is caused, and the normal work is influenced. In order to protect the whole circuit of the agricultural machinery vehicle computer from being damaged by the input power supply, a power supply protection circuit is generally required to be added at the input end of the whole power supply, so that the power supply is protected from being damaged on one hand, and the whole circuit of the agricultural machinery vehicle computer is protected from being damaged due to the fault of the input power supply on the other hand. However, the existing power protection circuit has a series of problems of single function, high cost, complex control and the like, and is difficult to meet the requirement of agricultural machinery, so that it is particularly necessary to provide a power protection circuit applied to a traveling computer of agricultural machinery.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a power supply protection circuit applied to an agricultural mechanical traveling crane computer, which aims to solve the technical problems in the prior art, has a simple circuit structure and can effectively protect the circuit of the agricultural mechanical traveling crane computer.
In order to achieve the purpose, the utility model provides the following scheme: the utility model provides a power supply protection circuit applied to a traveling computer of agricultural machinery, which comprises: the agricultural machinery driving computer circuit is connected with the input power supply through the switch circuit, and a first power supply protection circuit and a second power supply protection circuit are connected between the agricultural machinery driving computer circuit and the input power supply in parallel; the input end of the switch control circuit is connected with the agricultural machinery traveling computer circuit, and the output end of the switch control circuit is connected with the switch circuit;
the switch control circuit comprises a reference voltage acquisition circuit, a temperature-change voltage acquisition circuit and a comparison circuit; the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are connected in parallel, the input ends of the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are respectively connected with the agricultural machinery traveling computer circuit, the output ends of the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are respectively connected with the comparison circuit, and the comparison circuit is connected with the switch circuit.
Preferably, the reference voltage acquisition circuit comprises a first resistor and a second resistor which are connected in series; the temperature-variable voltage acquisition circuit comprises a third resistor and a fourth resistor which are connected in series; the first resistor and the third resistor are connected with the anode of the agricultural machinery driving computer circuit, and the second resistor and the fourth resistor are connected with the cathode of the agricultural machinery driving computer circuit.
Preferably, the first resistor and the third resistor have the same resistance, the fourth resistor is a thermistor with a negative temperature coefficient, and the fourth resistor has the same resistance as the first resistor at a preset temperature.
Preferably, the comparison circuit adopts a JZ053 single threshold voltage comparator.
Preferably, the output end of the reference voltage obtaining circuit is connected to the negative input end of the comparison circuit, and the output end of the temperature-varying voltage obtaining circuit is connected to the positive input end of the comparison circuit.
Preferably, the switch circuit adopts a relay, when the comparison circuit outputs a high level, the relay is closed, and when the comparison circuit outputs a low level, the relay is opened.
Preferably, the first power protection circuit adopts a transient diode TVS, one end of the TVS is connected with the anode of the agricultural machinery vehicle computer circuit, and the other end of the TVS is connected with the cathode of the agricultural machinery vehicle computer circuit.
Preferably, the TVS is model SM8S 33A.
Preferably, the second power protection circuit includes a fuse, a first filter capacitor, and a second filter capacitor, where the first filter capacitor is a polar capacitor; one end of the fuse is connected with the positive electrode of the input power supply, the other end of the fuse is connected with the positive electrode of the first filter capacitor, the positive electrode of the first filter capacitor is connected with the positive electrode of the agricultural machinery driving computer circuit, the negative electrode of the first filter capacitor is connected with the negative electrode of the agricultural machinery driving computer circuit, and the second filter capacitor is connected with the first filter capacitor in parallel.
Preferably, the specification of the first filter capacitor is 220 μ F — 50V, and the specification of the second filter capacitor is 10 μ F — 10% _ 50V.
The utility model discloses the following technical effects:
the utility model provides a power supply protection circuit applied to an agricultural machinery driving computer, which comprises a switch control circuit, a first power supply protection circuit and a second power supply protection circuit, wherein the switch control circuit senses the temperature change of the agricultural machinery driving computer circuit through a thermistor and converts the temperature change into the voltage change to realize the on-off control of an input power supply, so that the damage of overhigh temperature to the agricultural machinery driving computer circuit is effectively avoided; the first power supply protection circuit realizes surge limitation on an input power supply through a TVS (transient voltage suppressor), and the second power supply protection circuit realizes limitation on current of the input power supply through a fuse; the circuit structure of the utility model is simple, and the effective protection of the computer circuit of the agricultural machinery traveling crane is realized through the triple protection of the switch control circuit, the first power supply protection circuit and the second power supply protection circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a power protection circuit applied to a traveling computer of an agricultural machine according to the present invention;
FIG. 2 is a schematic diagram of the switch control circuit according to the present invention;
fig. 3 is a schematic connection diagram of a first power protection circuit and a second power protection circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 to 3, the present embodiment provides a power protection circuit applied to a traveling computer of an agricultural machine, including: the agricultural machinery driving computer circuit is connected with the input power supply through the switch circuit, and a first power supply protection circuit and a second power supply protection circuit are connected between the agricultural machinery driving computer circuit and the input power supply in parallel; the input end of the switch control circuit is connected with the agricultural machinery traveling computer circuit, and the output end of the switch control circuit is connected with the switch circuit;
the switch control circuit comprises a reference voltage acquisition circuit, a temperature-change voltage acquisition circuit and a comparison circuit; the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are connected in parallel, the input ends of the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are respectively connected with the agricultural machinery traveling computer circuit, the output ends of the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are respectively connected with the comparison circuit, and the comparison circuit is connected with the switch circuit.
In a further optimized scheme, the reference voltage acquisition circuit is used for acquiring reference voltage, the temperature-variable voltage acquisition circuit is used for sensing the temperature change of the agricultural machinery driving computer circuit, and the output voltage of the temperature-variable voltage acquisition circuit changes along with the temperature change of the agricultural machinery driving computer circuit.
The reference voltage acquisition circuit comprises a first resistor R1 and a second resistor R2 which are connected in series; the temperature-varying voltage acquisition circuit comprises a third resistor R3 and a fourth resistor R4 which are connected in series; the first resistor R1 and the third resistor R3 are connected with the anode of the agricultural machinery driving computer circuit, the second resistor R2 and the fourth resistor R4 are connected with the cathode of the agricultural machinery driving computer circuit, the voltage of the second resistor R2 is the output voltage of the reference voltage acquisition circuit, and the voltage of the fourth resistor R4 is the output voltage of the temperature-variable voltage acquisition circuit; the resistance values of the first resistor R1 and the third resistor R3 are the same, the fourth resistor R4 is a thermistor with a negative temperature coefficient, the resistance value of the fourth resistor R4 is the same as the resistance value of the first resistor R1 at a preset temperature, the resistance value of the fourth resistor R4 becomes smaller as the temperature of the agricultural machinery traveling circuit rises, and the output voltage of the temperature-variable voltage acquisition circuit also becomes smaller as the temperature of the agricultural machinery traveling circuit rises. In this embodiment, the preset temperature is 50 ℃.
In a further optimized scheme, the comparison circuit adopts a JZ053 single threshold voltage comparator U1, the output end of the reference voltage obtaining circuit is connected to the negative input end of the comparison circuit, the output end of the temperature-varying voltage obtaining circuit is connected to the positive input end of the comparison circuit, when the output voltage of the temperature-varying voltage obtaining circuit is greater than or equal to the output voltage of the reference voltage obtaining circuit, the comparison circuit outputs a high level, otherwise, the comparison circuit outputs a low level.
In a further optimized scheme, the switch circuit adopts a relay, when the comparison circuit outputs a high level, the relay is closed, and the input power supply supplies power to the agricultural machinery running computer circuit; when the comparison circuit outputs a low level, the relay is switched off, and the input power supply stops supplying power to the agricultural machinery running computer circuit.
In a further optimized scheme, the first power protection circuit adopts a Transient Voltage Support (TVS) D1, one end of the TVS is connected with the positive electrode of the agricultural machinery vehicle computer circuit, and the other end of the TVS is connected with the negative electrode of the agricultural machinery vehicle computer circuit. The TVC is a diode-type high-efficiency protection device, and utilizes the reverse breakdown working principle of a P-N junction to guide high-voltage pulses into the ground, so that the surge of an input power supply is limited. In this embodiment, the model of the TVS is SM8S 33A.
In a further optimized scheme, the second power protection circuit comprises a fuse F1, a first filter capacitor C1 and a second filter capacitor C2, wherein the first filter capacitor C1 is a polar capacitor; fuse F1 one end with the anodal of input power is connected, the other end with first filter capacitor C1's anodal is connected, first filter capacitor C1's positive pole with the anodal of agricultural machinery vehicle computer circuit is connected, first filter capacitor C1's negative pole with the negative pole of agricultural machinery vehicle computer circuit is connected, second filter capacitor C2 with first filter capacitor C1 parallel connection. In this embodiment, the type of the fuse F1 is RL30-300, the specification of the first filter capacitor is 220 μ F — 50V, and the specification of the second filter capacitor is 10 μ F — 10% _ 50V. Because of the conductor has certain resistance, when the current passes through the fuse F1, the fuse F1 will generate heat, when the circuit breaks down or is abnormal, along with the continuous rising of the current, the fuse F1 fuses to cut off the current, thereby avoiding the rising current to damage components and parts or burn out the circuit, thereby realizing the restriction to the input current, and effectively avoiding the damage of the large input current of the input power supply to the circuits of the agricultural machinery running computers.
The utility model discloses the following technical effects:
the utility model provides a power supply protection circuit applied to an agricultural machinery driving computer, which comprises a switch control circuit, a first power supply protection circuit and a second power supply protection circuit, wherein the switch control circuit senses the temperature change of the agricultural machinery driving computer circuit through a thermistor and converts the temperature change into the voltage change to realize the on-off control of an input power supply, so that the damage of overhigh temperature to the agricultural machinery driving computer circuit is effectively avoided; the first power supply protection circuit realizes surge limitation on an input power supply through a TVS (transient voltage suppressor), and the second power supply protection circuit realizes limitation on the current of the input power supply through a fuse F1; the circuit structure of the utility model is simple, and the effective protection of the computer circuit of the agricultural machinery traveling crane is realized through the triple protection of the switch control circuit, the first power supply protection circuit and the second power supply protection circuit.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. A power protection circuit applied to a traveling computer of agricultural machinery is characterized by comprising: the agricultural machinery driving computer circuit is connected with the input power supply through the switch circuit, and a first power supply protection circuit and a second power supply protection circuit are connected between the agricultural machinery driving computer circuit and the input power supply in parallel; the input end of the switch control circuit is connected with the agricultural machinery traveling computer circuit, and the output end of the switch control circuit is connected with the switch circuit;
the switch control circuit comprises a reference voltage acquisition circuit, a temperature-change voltage acquisition circuit and a comparison circuit; the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are connected in parallel, the input ends of the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are respectively connected with the agricultural machinery traveling computer circuit, the output ends of the reference voltage acquisition circuit and the temperature-variable voltage acquisition circuit are respectively connected with the comparison circuit, and the comparison circuit is connected with the switch circuit.
2. The power protection circuit applied to the agricultural machinery running computer is characterized in that the reference voltage acquisition circuit comprises a first resistor and a second resistor which are connected in series; the temperature-variable voltage acquisition circuit comprises a third resistor and a fourth resistor which are connected in series; the first resistor and the third resistor are connected with the anode of the agricultural machinery driving computer circuit, and the second resistor and the fourth resistor are connected with the cathode of the agricultural machinery driving computer circuit.
3. The power protection circuit applied to the traveling computer of the agricultural machine as claimed in claim 2, wherein the first resistor and the third resistor have the same resistance, the fourth resistor is a thermistor with a negative temperature coefficient, and the fourth resistor has the same resistance as the first resistor at a preset temperature.
4. The power protection circuit applied to the traveling computer of the agricultural machine as claimed in claim 1, wherein the comparison circuit adopts a JZ053 single threshold voltage comparator.
5. The power protection circuit applied to the agricultural machinery running computer is characterized in that the output end of the reference voltage acquisition circuit is connected to the negative input end of the comparison circuit, and the output end of the temperature-varying voltage acquisition circuit is connected to the positive input end of the comparison circuit.
6. The power protection circuit applied to the traveling computer of the agricultural machine as claimed in claim 1, wherein the switching circuit adopts a relay, the relay is closed when the comparison circuit outputs a high level, and the relay is opened when the comparison circuit outputs a low level.
7. The power protection circuit applied to the agricultural machinery vehicle computer of claim 1, wherein the first power protection circuit adopts a transient diode TVS, one end of the TVS is connected with the anode of the agricultural machinery vehicle computer circuit, and the other end of the TVS is connected with the cathode of the agricultural machinery vehicle computer circuit.
8. The power protection circuit applied to the agricultural machinery running computer as claimed in claim 7, wherein the TVS is SM8S33A model.
9. The power protection circuit applied to the agricultural machinery running computer as claimed in claim 1, wherein the second power protection circuit comprises a fuse, a first filter capacitor and a second filter capacitor, wherein the first filter capacitor is a polar capacitor; one end of the fuse is connected with the positive electrode of the input power supply, the other end of the fuse is connected with the positive electrode of the first filter capacitor, the positive electrode of the first filter capacitor is connected with the positive electrode of the agricultural machinery driving computer circuit, the negative electrode of the first filter capacitor is connected with the negative electrode of the agricultural machinery driving computer circuit, and the second filter capacitor is connected with the first filter capacitor in parallel.
10. The power protection circuit applied to the agricultural machinery running computer is characterized in that the specification of the first filter capacitor is 220 μ F _50V, and the specification of the second filter capacitor is 10 μ F _ 10% _ 50V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121320125.4U CN215871171U (en) | 2021-06-15 | 2021-06-15 | Power supply protection circuit applied to agricultural machinery traveling computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121320125.4U CN215871171U (en) | 2021-06-15 | 2021-06-15 | Power supply protection circuit applied to agricultural machinery traveling computer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215871171U true CN215871171U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121320125.4U Active CN215871171U (en) | 2021-06-15 | 2021-06-15 | Power supply protection circuit applied to agricultural machinery traveling computer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215871171U (en) |
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2021
- 2021-06-15 CN CN202121320125.4U patent/CN215871171U/en active Active
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