CN204301911U - A kind of oil pressure sensor circuit - Google Patents
A kind of oil pressure sensor circuit Download PDFInfo
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- CN204301911U CN204301911U CN201420796599.XU CN201420796599U CN204301911U CN 204301911 U CN204301911 U CN 204301911U CN 201420796599 U CN201420796599 U CN 201420796599U CN 204301911 U CN204301911 U CN 204301911U
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Abstract
A kind of oil pressure sensor circuit, comprise input power protective circuit, transducer, the input of transducer is for receiving oil pressure, and the output of transducer is sequentially connected in series amplifying circuit and output terminal protecting circuit; Output terminal protecting circuit comprises single operational amplifier, and single operational amplifier output terminal is connected with protective circuit; Input power protective circuit comprises input power, and input power connects LDO chip, and LDO chip output connects voltage stabilizing circuit; Input power protective circuit provides power supply for described transducer, amplifying circuit and protective circuit.Transducer based on technique scheme can realize input voltage can not burn out transducer between-50v to 50v, and input voltage can normally work at 5-50 scope inner sensor.At output access 50V voltage, transducer can not burn out, and recovers still can normally work normally.
Description
Technical field
The utility model belongs to sensor field, particularly relates to a kind of oil pressure sensor circuit.
Background technology
Oil pressure sensor is a kind of electronic device oil pressure being converted to the signal of telecommunication, is widely used in vehicle electronics.Current most oil pressure sensor is directly outputed signal by transducer and amplifying circuit.Because current oil pressure sensor input voltage is all 5V-12V, and sensor output is without any protection, in actual entrucking process, due to reasons such as operate misses, transducer connects makes mistakes, and such as power input is connected to 24V (even high to 50V), reverse power connection, output is connected to power supply., the permanent damages of transducer will be caused like this, cause unnecessary loss.
Utility model content
In order to solve the problem, the utility model adds two protective circuits and prevents the misconnection of power supply from causing expendable destruction to transducer on traditional basis.
In order to achieve the above object, the utility model is by the following technical solutions:
A kind of oil pressure sensor circuit, comprise input power protective circuit, transducer, the input of described transducer is for receiving oil pressure, and the output of described transducer is sequentially connected in series amplifying circuit and output terminal protecting circuit; Described output terminal protecting circuit comprises single operational amplifier, and described single operational amplifier output terminal is connected with protective circuit; Described input power protective circuit comprises input power, and described input power connects LDO chip, and described LDO chip output connects voltage stabilizing circuit; Described input power protective circuit provides power supply for described transducer, amplifying circuit and protective circuit.
Described LDO chip is TPS79801, described input power is by electric capacity C2 ground connection, described input power connects the input of TPS79801 and permission position, resistance R11 is connected with between described TPS79801 output and feedback pin, described feedback pin is by resistance R12 ground connection, described TPS79801 output is by electric capacity C10 ground connection, and the GND of described TPS79801 holds ground connection.
Described LDO chip is TPS79850, described input power is by electric capacity C6 ground connection, and described input power connects the input of TPS79850 and permission position, and described TPS79850 output is by electric capacity C7 ground connection, the feedback pin ground connection of described TPS79850, the GND of described TPS79850 holds ground connection.
Described single operational amplifier is MCP6001, described MCP6001 in-phase input end connects amplification circuit output end, described MCP6001 output is connected with inverting input, the output of described MCP6001 is connected diode D2 with forward between signal output part, described signal output part and MCP6001 logic ground end Opposite direction connection diode D1, described MCP6001 logic ground end ground connection, described signal output part is by resistance R10 ground connection.
Described sensor output signal is SEN1 and SEN2; Described amplifying circuit comprises bridge voltage translation interface integrated circuit AM467, and described AM467 normal phase input end meets SEN1, described AM467 anti-phase input termination test node 2, the indirect electric capacity C4 of described AM467 normal phase input end and inverting input; The VCC end of described AM467 is by electric capacity C1 ground connection, and the VCC end of described AM467 is connected with test node 2 with the second test circuit by the first test circuit be sequentially connected in series, and the VCC end of described AM467 also connects input power protective circuit output; Be test node 1 between described first test circuit and the second test circuit; Described test node 1 is connected with AM467 output by resistance R4, and described test node 1 is by resistance R5 ground connection; Described AM467 output is connected with AM467 inverting input by electric capacity C5, and described AM467 output connects output terminal protecting circuit, and described AM467 output is by electric capacity C3 ground connection, and described electric capacity C3 is connected in parallel resistance R9; The GND of described AM467 holds ground connection.
Described first test circuit comprises the adjustable resistance R6 and adjustable resistance R7 that are connected in series, and described adjustable resistance R7 is connected in parallel adjustable resistance R8.
Described second test circuit comprises the adjustable resistance R1 and adjustable resistance R3 that are connected in series, and described adjustable resistance R1 is connected in parallel adjustable resistance R2.
Described oil pressure sensor circuit also comprises dispatch from the factory debugging interface and input/output interface; The described debugging interface that dispatches from the factory is provided with test node 1 port, test node 2 port, input power port and signal output port, and described test node 1 port, test node 2 port, input supply terminal and signal output part be connecting test node 1, test node 2, input power and signal output part respectively; Input and output end interface is provided with input power port and signal output port, and described input power port is connected input power and signal output part respectively with signal output port.
The beneficial effects of the utility model are:
1, change traditional input power into input power protective circuit, add LDO chip, input voltage range 3V-50V, the pressure reduction of output current 50mA, 0.3V, input reverse voltage range-65V-----0V.Operating voltage due to the amplifying circuit of transducer is 4.5V to 6V, and when outside input 5V power supply, the supply power voltage of amplifying circuit is 5-0.3=4.7V, meets the need of work of amplifying circuit completely.When externally fed is negative pressure, TPS79801 enters guard mode immediately, output of stopping power supply, thus protection late-class circuit.
2, before signal exports, add output terminal protecting circuit, add backward diode, effectively prevent power supply to the destruction of sensing circuit when output misconnection power supply.
Accompanying drawing explanation
Fig. 1 the utility model block diagram;
Fig. 2 input power protective circuit embodiment 1;
Fig. 3 input power protective circuit embodiment 2;
Fig. 4 output terminal protecting circuit;
Fig. 5 amplifying circuit;
Fig. 6 transducer schematic diagram;
Fig. 7 dispatches from the factory debugging interface;
Fig. 8 input/output interface.
Embodiment
In order to better understand the technical solution of the utility model, below in conjunction with accompanying drawing, the technical scheme that the utility model adopts is described further.
As shown in Figure 1, a kind of oil pressure sensor circuit comprises input power protective circuit, transducer, and the input of transducer is for receiving oil pressure, and the output of transducer is sequentially connected in series amplifying circuit and output terminal protecting circuit; Output terminal protecting circuit comprises single operational amplifier, and single operational amplifier output terminal is connected with protective circuit; For preventing output misconnection power supply from destroying circuit, input power protective circuit comprises input power, and input power connects LDO chip, and LDO chip output connects voltage stabilizing circuit; Input power protective circuit provides power supply for described transducer, amplifying circuit and protective circuit, and input power protective circuit is used for preventing input misconnection high voltage or reverse voltage from destroying circuit.
As shown in Fig. 2-Fig. 3; input power protective circuit concrete structure adopts the low voltage difference LDO chip of TI: TPS79801QDGNRQ1 (ADJ) or TPS79850QDGNRQ1 (5V); wherein TPS79801QDGNRQ1 (ADJ) can regulate according to load resistance for adjustable chip and output voltage, and the output voltage of TPS79850QDGNRQ1 (5V) is fixed as 5V.
During employing TPS79801QDGNRQ1 (ADJ), particular circuit configurations is: input power VIN is by electric capacity C2 ground connection, input power connects the input of TPS79801 and permission position, resistance R11 is connected with between TPS79801 output and feedback pin, feedback pin is by resistance R12 ground connection, TPS79801 output is by electric capacity C10 ground connection, and the GND of TPS79801 holds ground connection.
During employing TPS79850QDGNRQ1 (5V), particular circuit configurations is: input power is by electric capacity C6 ground connection, input power connects the input of TPS79850 and permission position, TPS79850 output is by electric capacity C7 ground connection, the feedback pin ground connection of TPS79850, the GND of TPS79850 holds ground connection.
Operating voltage due to the amplifying circuit of transducer is 4.5V to 6V, and when outside input 5V power supply, the supply power voltage of amplifying circuit is 5-0.3=4.7V, meets the need of work of amplifying circuit completely.
When externally fed is negative pressure, LDO chip enters guard mode immediately, output of stopping power supply, thus protection late-class circuit.
As shown in Figure 4; out-put supply protective circuit concrete structure is: output terminal protecting circuit comprises single operational amplifier; single operational amplifier output terminal is connected with protective circuit; single operational amplifier is MCP6001; MCP6001 in-phase input end connects amplification circuit output end; MCP6001 output is connected with inverting input; the output of MCP6001 is connected diode D2 with forward between signal output part; signal output part and MCP6001 logic ground end Opposite direction connection diode D1; MCP6001 logic ground end ground connection, signal output part is by resistance R10 ground connection.
Connect a Schottky diode D2, and model is rom RB021VA90, and its most high backward voltage is 90V, and maximum current is 0.2A, and under the state of normal temperature 10mA operating current, forward voltage drop representative value is the needs that about 0.2V can meet transducer.Connect a 100K grounding through resistance in diode rear class, diode can be made to be in conducting state, if like this when the voltage of output access 0-90V, the one-way conduction due to diode has cut off the voltage of input, thus protects output stage chip.
As shown in Figure 6, sensor output signal is SEN1 and SEN2;
As shown in Figure 5, amplifying circuit comprises bridge voltage translation interface integrated circuit AM467, and AM467 normal phase input end meets SEN1, the indirect electric capacity C4 of AM467 anti-phase input termination test node 2, AM467 normal phase input end and inverting input; The VCC end of AM467 is by electric capacity C1 ground connection, and the VCC end of AM467 is connected with test node 2 with the second test circuit by the first test circuit be sequentially connected in series, and the VCC end of AM467 also connects input power protective circuit output; It is test node 1 between first test circuit and the second test circuit; Test node 1 is connected with AM467 output by resistance R4, and test node 1 is by resistance R5 ground connection; AM467 output is connected with AM467 inverting input by electric capacity C5, and AM467 output connects output terminal protecting circuit, and AM467 output is by electric capacity C3 ground connection, and electric capacity C3 is connected in parallel resistance R9; The GND of AM467 holds ground connection.
First test circuit comprises the adjustable resistance R6 and adjustable resistance R7 that are connected in series, and described adjustable resistance R7 is connected in parallel adjustable resistance R8.
Second test circuit comprises the adjustable resistance R1 and adjustable resistance R3 that are connected in series, and described adjustable resistance R1 is connected in parallel adjustable resistance R2.
As shown in Figs. 7-8, oil pressure sensor circuit also comprises dispatch from the factory debugging interface and input/output interface; The debugging interface that dispatches from the factory is provided with test node 1 port, test node 2 port, input power port and signal output port, and test node 1 port, test node 2 port, input supply terminal and signal output part be connecting test node 1, test node 2, input power and signal output part respectively; Input and output end interface is provided with input power port and signal output port, and input power port and signal output port are connected input power and signal output part respectively.
When transducer dispatches from the factory, by dispatching from the factory, debugging interface is modulated transducer, regulates the first test circuit resistance and the second test circuit resistance, makes sensor parameters performance best.First test circuit territory second test circuit adopts two to go here and there annexation in the lump, namely two resistor coupled in parallel reach the object of adjustable any resistance with another resistant series again, this mainly can use for some resistance market not having ready-made resistance, can only carry out in this way combining to satisfy the demands.
Transducer adopts bridge balance principle, and when there being pressure to produce, make electric bridge be in non-equilibrium state, faint pressure reduction appears in two ends, and this pressure reduction is input to the in+ of AM467, and in-two ends, are amplified by AM467, exports at out end.
Output voltage regulates:
1, floating voltage regulates, and under transducer pressure-less state, by regulating R1.R3.R2 resistance value, makes SENSOR_OUT export 0.5V (floating voltage).
2, full range voltage, transducer access 1MPA steady pressure, by regulating R6, R7, R8, resistance value, the negative feedback voltage of resonance-amplifier, makes the output voltage (SENSOR_OUT) of amplifier, reaches 4.5V (full range voltage).
3, make transducer return to pneumatics state, then regulate R1, R3, R2, make output reach 0.5V, and repeat (2) step, until voltage that is unloaded and full scale reaches (0.5v and 4.5v).
Transducer based on technique scheme can realize input voltage can not burn out transducer between-50v to 50v, and input voltage can normally work at 5-50 scope inner sensor.
At output access 50V voltage, transducer can not burn out, and recovers still can normally work normally.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection range of the present utility model.
Claims (8)
1. an oil pressure sensor circuit, is characterized in that, comprises input power protective circuit, transducer, and the input of described transducer is for receiving oil pressure, and the output of described transducer is sequentially connected in series amplifying circuit and output terminal protecting circuit; Described output terminal protecting circuit comprises single operational amplifier, and described single operational amplifier output terminal is connected with protective circuit; Described input power protective circuit comprises input power, and described input power connects LDO chip, and described LDO chip output connects voltage stabilizing circuit; Described input power protective circuit provides power supply for described transducer, amplifying circuit and protective circuit.
2. a kind of oil pressure sensor circuit as claimed in claim 1, it is characterized in that, described LDO chip is TPS79801, described input power is by electric capacity C2 ground connection, described input power connects the input of TPS79801 and permission position, and be connected with resistance R11 between described TPS79801 output and feedback pin, described feedback pin is by resistance R12 ground connection, described TPS79801 output is by electric capacity C10 ground connection, and the GND of described TPS79801 holds ground connection.
3. a kind of oil pressure sensor circuit as claimed in claim 1, it is characterized in that, described LDO chip is TPS79850, described input power is by electric capacity C6 ground connection, described input power connects the input of TPS79850 and permission position, described TPS79850 output is by electric capacity C7 ground connection, and the feedback pin ground connection of described TPS79850, the GND of described TPS79850 holds ground connection.
4. a kind of oil pressure sensor circuit as claimed in claim 1, it is characterized in that, described single operational amplifier is MCP6001, described MCP6001 in-phase input end connects amplification circuit output end, described MCP6001 output is connected with inverting input, the output of described MCP6001 is connected diode D2 with forward between signal output part, described signal output part and MCP6001 logic ground end Opposite direction connection diode D1, described MCP6001 logic ground end ground connection, described signal output part is by resistance R10 ground connection.
5. a kind of oil pressure sensor circuit as claimed in claim 1, it is characterized in that, described sensor output signal is SEN1 and SEN2; Described amplifying circuit comprises bridge voltage translation interface integrated circuit AM467, and described AM467 normal phase input end meets SEN1, described AM467 anti-phase input termination test node 2, the indirect electric capacity C4 of described AM467 normal phase input end and inverting input; The VCC end of described AM467 is by electric capacity C1 ground connection, and the VCC end of described AM467 is connected with test node 2 with the second test circuit by the first test circuit be sequentially connected in series, and the VCC end of described AM467 also connects input power protective circuit output; Be test node 1 between described first test circuit and the second test circuit; Described test node 1 is connected with AM467 output by resistance R4, and described test node 1 is by resistance R5 ground connection; Described AM467 output is connected with AM467 inverting input by electric capacity C5, and described AM467 output connects output terminal protecting circuit, and described AM467 output is by electric capacity C3 ground connection, and described electric capacity C3 is connected in parallel resistance R9; The GND of described AM467 holds ground connection.
6. a kind of oil pressure sensor circuit as claimed in claim 5, is characterized in that, described first test circuit comprises the adjustable resistance R6 and adjustable resistance R7 that are connected in series, and described adjustable resistance R7 is connected in parallel adjustable resistance R8.
7. a kind of oil pressure sensor circuit as claimed in claim 5, is characterized in that, described second test circuit comprises the adjustable resistance R1 and adjustable resistance R3 that are connected in series, and described adjustable resistance R1 is connected in parallel adjustable resistance R2.
8. a kind of oil pressure sensor circuit as described in as arbitrary in claim 1-7, it is characterized in that, described oil pressure sensor circuit also comprises dispatch from the factory debugging interface and input/output interface; The described debugging interface that dispatches from the factory is provided with test node 1 port, test node 2 port, input power port and signal output port, and described test node 1 port, test node 2 port, input supply terminal and signal output part be connecting test node 1, test node 2, input power and signal output part respectively; Input and output end interface is provided with input power port and signal output port, and described input power port is connected input power and signal output part respectively with signal output port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420796599.XU CN204301911U (en) | 2014-12-16 | 2014-12-16 | A kind of oil pressure sensor circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420796599.XU CN204301911U (en) | 2014-12-16 | 2014-12-16 | A kind of oil pressure sensor circuit |
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| CN204301911U true CN204301911U (en) | 2015-04-29 |
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| CN201420796599.XU Active CN204301911U (en) | 2014-12-16 | 2014-12-16 | A kind of oil pressure sensor circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390738A (en) * | 2014-12-16 | 2015-03-04 | 济南优耐特汽车电子有限公司 | Oil pressure sensor circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390738A (en) * | 2014-12-16 | 2015-03-04 | 济南优耐特汽车电子有限公司 | Oil pressure sensor circuit |
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| GR01 | Patent grant |