CN218276470U - Digital display low-power consumption pressure gauge - Google Patents
Digital display low-power consumption pressure gauge Download PDFInfo
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- CN218276470U CN218276470U CN202222795291.0U CN202222795291U CN218276470U CN 218276470 U CN218276470 U CN 218276470U CN 202222795291 U CN202222795291 U CN 202222795291U CN 218276470 U CN218276470 U CN 218276470U
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Abstract
The utility model discloses a digital display low power consumption pressure gauge, which comprises a power supply unit and a main circuit unit connected with the power supply unit; the main circuit unit comprises a microprocessor, a pressure sensor interface circuit, a pressure sensor power supply control circuit, a key module and a display unit, wherein the pressure sensor power supply control circuit is connected with the pressure sensor interface circuit, the pressure sensor interface circuit and the microprocessor are sequentially connected, and the pressure sensor power supply control circuit, the key module and the display unit are respectively connected with the microprocessor. The utility model discloses digital display low-power consumption manometer, through constant current source reference circuit with pressure sensor power control circuit's setting starts from consumption and the sampling mode in the sampling process, reduces the power consumption in the use, reduces the whole power consumptive condition to it is long when prolonging the standby of instrument greatly, improves the competitiveness of instrument.
Description
Technical Field
The utility model relates to an industrial instrument field especially relates to a digital display low-power consumption manometer.
Background
The pipeline pressure monitoring instrument is one of common instruments in industrial production, and is mainly used for measuring pressure in an industrial pipeline. Most of traditional pipeline pressure monitoring instruments are diaphragm pointer type pressure gauges, and particularly, collection and display are completed in a mode of a pressure diaphragm and a mechanical pointer; the pointer type instrument is of a pure mechanical structure, does not need external power supply, but can only be observed and read in a short distance due to the fact that a pointer disc is small. And the inside corrosive gas or high temperature medium that often contains of industry pipeline, pipeline internal pressure is also great, and operating personnel station position is nearer, closely observes during the pressure value that the pipeline goes up the manometer and detects, in case there is gas or liquid in the pipeline to reveal, and is very dangerous, and personal safety can not obtain the guarantee, for this reason, has appeared the digital display manometer.
The digital display pressure gauge adopts digital display, so that the pressure value can be displayed on a larger liquid crystal screen, and the observation at a farther distance can be realized by the aid of the backlight lamp, thereby well solving the problem of the observation distance. However, the digital display pressure gauge usually comprises electronic units such as a single chip microcomputer and the like inside, and can work only by external power supply; however, in the actual production process, the industrial pipeline pressure taking position is determined by a user according to actual needs, that is, the installation position of the pressure gauge is flexible and changeable and is not fixed, so that the power supply position of the digital display pressure gauge is uncertain, the digital display pressure gauge can not be supplied with power through a power grid, and a battery is needed for supplying power. In the digital display pressure gauge at present, the power supply of the pressure gauge is generally 2 AA batteries, the AA battery is No. 5 battery, the capacity is generally 1500mAH, the total capacity of the No. 5 battery 2 is about 3000 mAH, and the power supply energy is limited. In the actual use process, the batteries can be replaced in the industrial field except for the production stop stages such as the maintenance process and the like, and the batteries are inconvenient to replace at other times; under the condition that the battery is not replaced, the digital display pressure gauge is required to have a low-power-consumption design so as to have long standby time without replacing the battery at a high frequency, and therefore, the digital display pressure gauge can have higher market competitiveness so as to replace the traditional pointer pressure gauge.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a digital display low-power consumption manometer.
A digital display low-power consumption pressure gauge comprises a power supply unit and a main circuit unit;
the power supply unit comprises a battery and a DC-DC power conversion circuit, and the battery, the DC-DC power conversion circuit and the main circuit unit are sequentially connected;
the main circuit unit comprises a microprocessor, a pressure sensor interface circuit, a pressure sensor power supply control circuit, a key module and a display unit, wherein the pressure sensor and the pressure sensor power supply control circuit are respectively connected with the pressure sensor interface circuit, and the pressure sensor power supply control circuit, the key module and the display unit are respectively connected with the microprocessor;
the pressure sensor interface circuit comprises a pressure sensor interface J3, a constant current source reference circuit, a filter circuit and a sampling output end Vout, wherein the pressure sensor interface is provided with a power supply end and an output end, the constant current source reference circuit is connected with the power supply end of the pressure sensor interface J3, the output end of the pressure sensor interface is sequentially connected with the filter circuit and the sampling output end Vout, and the sampling output end Vout is connected with the microprocessor.
Further, the constant current source reference circuit comprises an operational amplifier U2 and a resistor, a non-inverting input end of the operational amplifier U2 is connected with the microprocessor after being connected with the resistor R15 in series, an inverting input end of the operational amplifier U2 is connected with the resistor R11 in series between the ground, and the inverting input end of the operational amplifier U2 and the output end of the operational amplifier U2 are respectively connected with the positive electrode and the negative electrode of the power supply end of the pressure sensor interface J3.
Further, the constant current source reference circuit comprises an operational amplifier U2 and a resistor, wherein a resistor R16 and a resistor R13 are sequentially connected between a non-inverting input end of the operational amplifier U2 and the voltage terminal VCC1, a resistor R14 is serially connected between one end of the resistor R16 connected with the resistor R13 and the ground, a resistor R11 is serially connected between an inverting input end of the operational amplifier U2 and the ground, and the inverting input end of the operational amplifier U2 and the output end of the operational amplifier U2 are respectively connected to the positive electrode and the negative electrode of the power supply end of the pressure sensor interface J3.
Further, the pressure sensor power supply control circuit comprises an MOS tube Q2, a resistor R19, a processor connection end ADPWR _ CTL and a sensor power supply end 3V _ _AD, wherein the sensor power supply end 3V _ _ADis connected with the pressure sensor interface circuit, the processor connection end ADPWR _ CTL is connected with the microprocessor, a G pole of the MOS tube Q2 is connected with the processor connection end ADPWR _ CTL, a G pole of the MOS tube Q2 is connected with an S pole series resistor R19 of the MOS tube Q2, an S pole of the MOS tube Q2 is connected with a voltage end VCC2, and a D pole of the MOS tube Q2 is connected with the sensor power supply end V _ _AD.
Further, the pressure sensor is a silicon piezoresistive pressure core body.
Further, the microprocessor is a low power microprocessor. The microprocessor is internally provided with an AD converter and is supplied with power through DC 3V.
Furthermore, the key module comprises a power key, a backlight key, a clear key and a unit key.
Further, the display unit comprises a segment code liquid crystal screen and a backlight control circuit connected with the segment code liquid crystal screen; the segment code liquid crystal display and the backlight control circuit are respectively connected with the microprocessor.
Further, the segment code liquid crystal display comprises an MOS tube Q1, a processor connecting end BL _ CTRL and a plurality of resistors, the processor connecting end BL _ CTRL is connected with the microprocessor, a G pole of the MOS tube Q1 is connected with the processor connecting end BL _ CTRL, a D pole of the MOS tube Q1 and the segment code liquid crystal display are connected with a resistor R10 in series, an S pole of the MOS tube Q1 is connected with a voltage end VCC3, and an S pole of the MOS tube Q1 and a G pole of the MOS tube Q1 are connected with a resistor R18 in series.
Further, the power supply unit further includes a battery voltage detection circuit, and the battery voltage detection circuit is connected to the battery and the microprocessor of the main circuit unit, respectively. The battery voltage detection circuit detects voltage information of the battery and transmits the detected voltage information of the battery to the microprocessor of the main circuit unit; the microprocessor of the main circuit unit transmits the voltage information of the battery transmitted by the battery voltage detection circuit to the display module for displaying so as to remind a user whether the battery needs to be replaced, and thus, the digital display low-power consumption pressure gauge has stronger functionality.
Furthermore, the battery voltage detection circuit comprises a battery connection end VBAT, a sampling voltage end VBAT _ AD and a plurality of resistors, wherein the battery connection end VBAT is connected with the battery, and the sampling voltage end VBAT _ AD is connected with the microprocessor; the battery connecting end VBAT and the ground are sequentially connected with the resistor R5 and the resistor R6 in series, and the resistor R7 is connected between one end of the resistor R5 connected with the resistor R6 and the sampling voltage end VBAT _ AD in series.
The utility model discloses digital display low-power consumption manometer on the one hand, provides invariable excitation current signal for pressure sensor through constant current source reference circuit to carry out the sampling of pressure signal in the pipeline; compared with constant-voltage excitation, under constant-current excitation, the current passing through the pressure sensor is constant, after the constant current passes through the pressure sensor, different linear voltage sampling signals are output according to the magnitude of the pressure signal sensed by the pressure sensor, namely in the constant-current excitation process, the output sampling value and the pressure signal are in a stable linear relation, and the loss in the sampling process is small; under the constant voltage excitation, a constant voltage is usually provided, under the constant voltage, the pressure sensor performs partial pressure sampling output, and under the partial pressure sampling, the ineffective power consumption is also large due to the partial pressure; in other words, the constant current source reference circuit is adopted to provide a constant excitation current signal for sampling, so that the power consumption is lower.
The utility model discloses digital display low-power consumption manometer, on the other hand, through the setting of pressure sensor power control circuit, make microprocessor send signal for after the pressure sensor power control circuit, through microprocessor can control switching on and off of pressure sensor power control circuit, and then can control whether the pressure sensor interface circuit gets electric work, whether pressure sensor's collection signal inserts the pressure sensor interface circuit, by the input of pressure sensor interface circuit to microprocessor and then gather; therefore, the microprocessor controls the pressure sensor power supply control circuit to control the acquisition time and rhythm of pressure signals in the pipeline, so as to conveniently carry out energy-saving setting.
The utility model discloses digital display low-power consumption manometer, in the design of current low-power consumption, through constant current source reference circuit with pressure sensor power control circuit's setting is started from consumption and the sampling mode in the sampling process, further reduces the power consumption in the use, reduces whole power consumption condition to when prolonging the standby of instrument greatly, improve the competitiveness of instrument.
Drawings
FIG. 1 is a functional block diagram of the pressure gauge with low power consumption and digital display of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of a pressure sensor interface of the digitally displayed low power pressure gauge of the present invention;
FIG. 3 is a circuit diagram of a second embodiment of the pressure sensor interface of the digitally displayed low power pressure gauge of the present invention;
fig. 4 is a circuit diagram of the pressure sensor power supply control circuit of the digital display low power consumption pressure gauge of the present invention;
fig. 5 is a circuit diagram of the display unit of the digital display low power consumption pressure gauge of the present invention;
fig. 6 is a circuit diagram of the battery voltage detection circuit of the digital display low power consumption pressure gauge of the present invention.
Detailed Description
The following detailed description of the embodiments of the digital display low power consumption pressure gauge of the present invention is made with reference to the accompanying drawings:
as shown in fig. 1 and 2, a digital display low power consumption pressure gauge includes a power supply unit 1 and a main circuit unit 2;
the power supply unit 1 comprises a battery 11 and a DC-DC power conversion circuit 12, and the battery 11, the DC-DC power conversion circuit 12 and the main circuit unit 2 are sequentially connected;
the main circuit unit 2 comprises a microprocessor 21, a pressure sensor 22, a pressure sensor interface circuit 23, a pressure sensor power supply control circuit 24, a key module 25 and a display unit 26, wherein the pressure sensor 22 and the pressure sensor power supply control circuit 24 are respectively connected with the pressure sensor interface circuit 23, and the pressure sensor power supply control circuit 24, the key module 25 and the display unit 26 are respectively connected with the microprocessor 21;
the pressure sensor interface circuit 23 includes a pressure sensor interface J3, a constant current source reference circuit 231, a filter circuit 232, and a sampling output terminal Vout, the pressure sensor interface J3 has power terminals (I +, I-) and output terminals (S +, S-), the constant current source reference circuit 231 is connected to the power terminals (I +, I-) of the pressure sensor interface J3, the output terminals (S +, S-) of the pressure sensor interface J3 are sequentially connected to the filter circuit 232 and the sampling output terminal Vout, and the sampling output terminal Vout is connected to the microprocessor 21.
The utility model discloses digital display low-power consumption manometer, power supply unit 1 with main circuit unit 2 is connected, does main circuit unit 2 provides the power. Specifically, the battery 11 in the power supply unit 1 is an energy storage unit; the DC-DC power conversion circuit 12 is configured to convert an electrical signal of the battery 11 into a required stable electrical signal, and then output the main circuit unit 2 connected thereto to supply power to the main circuit unit 2.
The utility model discloses digital display low-power consumption manometer, do during the power supply of main circuit unit 2, specifically, DC-DC power conversion circuit 12 will battery 11 unstable voltage back that steps up again, converts stable voltage into, then inserts each circuit through each voltage end like voltage end VCC1, voltage end VCC2 and voltage end VCC3 etc. for main circuit unit 2 supplies power.
In the digital display low power consumption pressure gauge of the utility model, in the main circuit unit 2, the pressure sensor 22 is used for sensing the pressure signal in the pipeline and converting the sensed pressure signal into an electric signal; the pressure sensor interface circuit 23 is used for accessing the pressure sensor 22; the pressure sensor power supply control circuit 24 is configured to receive a signal sent by the microprocessor 21, and implement on/off according to a control signal sent by the microprocessor 21 to control whether the power supply of the pressure sensor interface circuit 23 is connected, so as to control whether the pressure sensor 22 senses a pressure signal in a pipeline and is connected to the pressure sensor interface circuit 23; the pressure sensor interface circuit 23 is used for transmitting the pressure signal in the pipeline sensed by the pressure sensor 22 to the microprocessor 21. The key module 25 is used for performing a switching operation and inputting an instruction. The microprocessor 21 is configured to receive an instruction input by the key module 25; and is used for sending the signal to the said pressure sensor power control circuit 24, make the said pressure sensor power control circuit 24 turn on or cut off, and then in order to control the collection of the pressure signal in the pipeline; and is configured to send an acquisition signal to the display module 26, so that the display module 26 performs display or does not perform display.
In the pressure sensor interface circuit 23, specifically, the pressure sensor interface J3 is used for connecting with the pressure sensor 22; the constant current source reference circuit 231 is configured to provide a constant current source for the pressure sensor 22, so that the pressure sensor 22 can convert the sensed pressure signal into an electrical signal, and sampling of the pressure signal in the pipeline by the pressure sensor 22 is realized; the filter circuit 232 is used for filtering the sampling signal of the pressure sensor 22; the filtered sampling signal is output from the sampling output terminal Vout and transmitted to the microprocessor 21, and the microprocessor 21 performs AD conversion to complete the acquisition.
The utility model discloses digital display low-power consumption manometer, during the use, through button module 25, after starting, among the power supply unit 1 the signal of telecommunication of battery 11, warp DC-DC power conversion circuit 12 converts the stable signal of telecommunication that needs into, inserts main circuit unit 2, does main circuit unit 2 supplies power. After the main circuit unit 2 is powered on, the microprocessor 21 sends a signal to the pressure sensor power supply control circuit 24, controls whether the pressure sensor interface circuit 23 is powered on to work by controlling the on/off of the pressure sensor power supply control circuit 24, and further controls whether an acquisition signal of the pressure sensor 22 is connected to the pressure sensor interface circuit 23, and the acquisition signal is input to the microprocessor 21 by the pressure sensor interface circuit 23 to be acquired, that is, when acquiring a pressure signal in a pipeline, the microprocessor 21 can control the acquisition time or rhythm by controlling the pressure sensor power supply control circuit 24; if the energy is saved, under the control of the microprocessor 21, when the key module 25 is operated, the microprocessor 21 may control the pressure sensor power control circuit 24 to achieve continuous acquisition, so as to meet the acquisition requirement, and when the key module 25 is not operated for a long time, the microprocessor 21 may control the pressure sensor power control circuit 24 to perform intermittent acquisition, so as to reduce the power consumption and prolong the standby time of the battery 11.
The utility model discloses digital display low-power consumption manometer, during the concrete collection, microprocessor 21 sends the signal to pressure sensor power control circuit 24, pressure sensor power control circuit 24 switches on; after the pressure sensor power supply control circuit 24 is turned on, the pressure sensor interface circuit 23 is powered on to work, and the constant current source reference circuit 231 in the pressure sensor interface circuit 23 provides a constant current source for the pressure sensor 22; the pressure sensor 22 senses a pressure signal in the pipeline, converts the sensed pressure signal into an electrical signal, inputs the electrical signal into the pressure sensor interface circuit 23, and transmits the electrical signal to the microprocessor 21 through the sampling output terminal Vout for collection after being filtered by the filter circuit 232; after the microprocessor 21 realizes the acquisition, the acquired signal is sent to the display module 26 for display.
The utility model discloses digital display low-power consumption manometer on the one hand, through the constant current source reference circuit 231 for pressure sensor 22 provides invariable excitation current signal, in order to carry out the sampling of pressure signal in the pipeline; compared with constant voltage excitation, under constant current excitation, the current passing through the pressure sensor 22 is constant, after the constant current passes through the pressure sensor 22, different linear voltage sampling signals are output according to the magnitude of the pressure signal induced by the pressure sensor 22, namely in the constant current excitation process, the output sampling value and the pressure signal are in a stable linear relation, and the loss in the sampling process is small; under the constant voltage excitation, it is usually provided with a constant voltage, under which the pressure sensor 22 performs a voltage division sampling output, and under the voltage division sampling, the ineffective power consumption caused by the voltage division is also large; that is, the constant current source reference circuit 231 is used to provide a constant excitation current signal for sampling, and the power consumption is lower.
The utility model discloses digital display low-power consumption manometer, on the other hand, through the setting of pressure sensor power control circuit 24, make microprocessor 21 send the signal for behind the pressure sensor power control circuit 24, through microprocessor 21 can control switching on and off of pressure sensor power control circuit 24, and then can control whether pressure sensor interface circuit 23 gets electric work, whether pressure sensor 22's collection signal inserts pressure sensor interface circuit 23, by pressure sensor interface circuit 23 input microprocessor 21 and then gather; therefore, the microprocessor 21 controls the pressure sensor power supply control circuit 24 to control the acquisition time and rhythm of pressure signals in the pipeline, so as to conveniently perform energy-saving setting, for example, under the control of the microprocessor 21, when the key module 25 is operated, the microprocessor 21 can control the pressure sensor power supply control circuit 24 to realize continuous acquisition, so as to meet the acquisition requirement, and when the key module 25 is not operated for a long time, the microprocessor 21 can control the pressure sensor power supply control circuit 24 to perform intermittent acquisition, so as to reduce the power consumption.
The utility model discloses digital display low-power consumption manometer, in the design of current low-power consumption, through constant current source reference circuit 231 with pressure sensor power control circuit 24's setting starts from consumption and the sampling mode in the sampling process, further reduces the power consumption in the use, reduces whole power consumptive condition to it is long when the standby of instrument is prolonged greatly, improves the competitiveness of instrument. The utility model discloses digital display low-power consumption manometer uses 2 pieces of No. 5 batteries, can realize that the standby live time reaches more than 1 year, and the user can change the battery in a longer life cycle, has solved the too high difficult problem that leads to frequently changing the battery of present stage digital display manometer consumption, and it has wide market perspective.
The utility model discloses digital display low-power consumption manometer, pressure sensor interface circuit 23's a first kind embodiment is as shown in 2. In a first embodiment of the pressure sensor interface circuit 23, the constant current source reference circuit 231 includes an operational amplifier U2 and a resistor, a non-inverting input terminal of the operational amplifier U2 is connected in series with the resistor R15 and then connected to the microprocessor 21, an inverting input terminal of the operational amplifier U2 is connected in series with the resistor R11, and the inverting input terminal of the operational amplifier U2 and an output terminal of the operational amplifier U2 are respectively connected to positive and negative poles of the power supply terminals (I +, I-) of the pressure sensor interface J3.
The utility model discloses digital display low-power consumption manometer, in the first implementation of pressure sensor interface circuit 23, be connected to behind operational amplifier U2 'S the in-phase input end series resistance R15 of constant current source reference circuit 231 microprocessor 21, microprocessor 21 provides reference voltage for operational amplifier U2' S the in-phase input end, like 1.2V, simultaneously, operational amplifier U2 'S inverting input end obtains the same voltage, this signal of telecommunication with pressure sensor interface J3' S power end (I +, I-) is connected pressure sensor 22 makes pressure sensor 22 response 'S pressure signal can convert into the signal of telecommunication, accomplishes the sampling, and sampling signal by with pressure sensor 22 connects pressure sensor interface J3' S output (S +, S-) output, process after filter circuit 232 filters, by sampling output Vout carries microprocessor 21 gathers.
The utility model discloses digital display low-power consumption manometer, in the first implementation of pressure sensor interface circuit 23, reference voltage in the constant current source reference circuit 231 by microprocessor 21 is inside to be provided.
The utility model discloses digital display low-power consumption manometer, constant current source reference circuit 231's second kind embodiment is as shown in 3, constant current source reference circuit 231 includes operational amplifier U2 and resistance, and connecting gradually resistance R16 and resistance R13 between operational amplifier U2's in-phase input end and voltage end VCC1, and series resistance R14 between one end that resistance R16 and resistance R13 are connected and ground, operational amplifier U2's inverting input end and ground series resistance R11, operational amplifier U2's inverting input end and operational amplifier U2's output are connected to respectively the positive negative pole of pressure sensor interface J3's power end (I +, I-).
The utility model discloses digital display low-power consumption manometer, in the second kind of embodiment of pressure sensor interface circuit 23, reference voltage in the constant current source reference circuit 231 is provided by the external partial pressure circuit who comprises resistance R13 and resistance R14. The structure of the part is the same as that of the first embodiment of the pressure sensor interface circuit 23.
The utility model discloses digital display low-power consumption manometer, operational amplifier U2's model is OPA333 AIDBVR's operational amplifier.
The utility model discloses digital display low-power consumption manometer, as shown in fig. 4, preferably, pressure sensor power control circuit 24 includes MOS pipe Q2, resistance R19, treater link ADPWR _ CTL and sensor feed end 3V_AD, and sensor feed end 3V _ADis connected pressure sensor interface circuit 23, treater link ADPWR _ CTL are connected microprocessor 21, MOS pipe Q2 ' S the G utmost point is connected with treater link ADPWR _ CTL, MOS pipe Q2 ' S the G utmost point and MOS pipe Q2 ' S the S utmost point series resistance R19, MOS pipe Q2 ' S the S utmost point connection voltage end VCC2, MOS pipe Q2 ' S the D utmost point connection sensor feed end 3V _AD.
The utility model discloses digital display low-power consumption manometer, MOS pipe Q2's the G utmost point is connected with treater link ADPWR _ CTL, connects microprocessor 21, whether switching on of MOS pipe Q2 by microprocessor 21 control, promptly whether microprocessor 21 steerable voltage end VCC2 does pressure sensor interface circuit 23 supplies power, so, is convenient for microprocessor 21 control pipeline pressure signal's collection to be convenient for carry out the setting of economizing on electricity.
The utility model discloses digital display low-power consumption manometer, preferably, pressure sensor 22 is silicon piezoresistive pressure core. The pressure sensor 22 may be, but not limited to, a silicon piezoresistive pressure core, which is more flexible than other pressure sensors, and not only can be excited by a constant current or voltage, but also the minimum excitation electrical signal required during excitation is smaller, for example, the standard excitation current of the silicon piezoresistive pressure core is 1.5mA, the minimum excitation current is 600uA, and the minimum excitation current 600uA is only 40% of the nominal value, so that the design can be more flexible. If the utility model discloses digital display low-power consumption manometer when adopting constant current source excitation, still can use minimum excitation current 600uA, so make it under the prerequisite that satisfies the collection condition, can obtain lower consumption.
The utility model discloses digital display low-power consumption manometer, preferably, microprocessor 21 is low-power consumption microprocessor. The microprocessor 21 is internally provided with an AD converter and is supplied with power through DC 3V; for example, the microprocessor 21 with a built-in 16bit AD converter can meet the requirement of acquisition precision, has low power consumption, and has better applicability.
The utility model discloses digital display low-power consumption manometer, preferably, display element 26 includes segment code LCD screen 261 and is connected with segment code LCD screen 261's control circuit 262 in a poor light; the segment code liquid crystal display 261 and the backlight control circuit 262 are both connected to the microprocessor 21. Display module 26 can be the LED LCD screen, also can be the segment code LCD screen, because the display data of digital display low-power consumption manometer is less, and it is lower to show the precision, consequently, adopts the less segment code LCD screen of price to more do benefit to manufacturing cost's management and control.
The utility model discloses digital display low-power consumption manometer, preferably, as shown in fig. 5, section code LCD screen 261 includes MOS pipe Q1, treater link BL _ CTRL and a plurality of resistance, and treater link BL _ CTRL connects microprocessor 21, MOS pipe Q1 ' S the G utmost point is connected with treater link BL _ CTRL, MOS pipe Q1 ' S the D utmost point with series resistance R10 between section code LCD screen 261, MOS pipe Q1 ' S the S utmost point connect voltage end VCC3, MOS pipe Q1 ' S the S utmost point and MOS pipe Q1 ' S the G interelectrode series resistance R18.
The utility model discloses digital display low-power consumption manometer, MOS pipe Q1's the G utmost point is connected with treater link BL _ CTRL, connects microprocessor 21, MOS pipe Q1 switch on whether by microprocessor 21 controls, can control voltage end VCC3 do whether section code LCD screen 261 supplies power, so, is convenient for microprocessor 21 controls section code LCD screen 261's the power supply in a poor light to the economize on electricity setting of being convenient for.
The utility model discloses digital display low-power consumption manometer, button module 25 includes power key, backlight key, zero clearing key and unit key. The power key is used for turning on or off a power supply; the backlight key is used for inputting instructions to enable the microprocessor 21 to control the display unit 26, and the backlight of the display unit 26 can be turned on or off; the zero clearing key is used for realizing resetting and zero clearing; the unit key is used to convert the display contents of the display unit 26.
The utility model discloses digital display low-power consumption manometer, preferably, power supply unit 1 still includes battery voltage detection circuit 13, battery voltage detection circuit 13 respectively with battery 11 with main circuit unit 2 microprocessor 21 connects. The battery voltage detection circuit 13 detects voltage information of the battery 11 and transmits the detected voltage information of the battery 11 to the microprocessor 21 of the main circuit unit 2; the microprocessor 21 of the main circuit unit 2 transmits the voltage information of the battery 11 sent by the battery voltage detection circuit 13 to the display module 26 for displaying so as to remind a user whether the battery needs to be replaced, so that the digital display low-power consumption pressure gauge has stronger functionality.
The utility model discloses digital display low-power consumption manometer, preferably, as shown in fig. 6, battery voltage detection circuit 13 includes battery connection end VBAT, sample voltage end VBAT _ AD and a plurality of resistance, battery connection end VBAT connects battery 11, sample voltage end VBAT _ AD connects microprocessor 21; the battery connecting end VBAT and the ground are sequentially connected with the resistor R5 and the resistor R6 in series, and the resistor R7 is connected between one end of the resistor R5 connected with the resistor R6 and the sampling voltage end VBAT _ AD in series.
The utility model discloses digital display low-power consumption manometer, resistance R5 and resistance R6 constitute bleeder circuit, and when voltage signal through bleeder circuit collection battery connection end VBAT, accessible resistance R5 and resistance R6's ratio, the size of control collection value to let the collection value accord with microprocessor 21 interface, simultaneously, resistance R5 and resistance R6's ratio is adjusted, can let the design more nimble, convenient.
The utility model discloses digital display low-power consumption manometer, the effect of current-limiting is played to the resistance in each circuit.
The utility model discloses right the utility model belongs to the technical field of the ordinary skilled person, do not deviating from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (10)
1. A digital display low-power consumption pressure gauge comprises a power supply unit and a main circuit unit; the method is characterized in that:
the power supply unit comprises a battery and a DC-DC power conversion circuit, and the battery, the DC-DC power conversion circuit and the main circuit unit are sequentially connected;
the main circuit unit comprises a microprocessor, a pressure sensor interface circuit, a pressure sensor power supply control circuit, a key module and a display unit, wherein the pressure sensor and the pressure sensor power supply control circuit are respectively connected with the pressure sensor interface circuit, and the pressure sensor power supply control circuit, the key module and the display unit are respectively connected with the microprocessor;
the pressure sensor interface circuit comprises a pressure sensor interface J3, a constant current source reference circuit, a filter circuit and a sampling output end Vout, wherein the pressure sensor interface is provided with a power supply end and an output end, the constant current source reference circuit is connected with the power supply end of the pressure sensor interface J3, the output end of the pressure sensor interface is sequentially connected with the filter circuit and the sampling output end Vout, and the sampling output end Vout is connected with the microprocessor.
2. The digital display low power consumption pressure gauge according to claim 1, wherein: the constant current source reference circuit comprises an operational amplifier U2 and a resistor, wherein the non-inverting input end of the operational amplifier U2 is connected with the microprocessor after being connected with the resistor R15 in series, the inverting input end of the operational amplifier U2 is connected with the resistor R11 in series, and the inverting input end of the operational amplifier U2 and the output end of the operational amplifier U2 are respectively connected to the positive electrode and the negative electrode of the power supply end of the pressure sensor interface J3.
3. The digital display low power consumption pressure gauge according to claim 1, wherein: the constant current source reference circuit comprises an operational amplifier U2 and a resistor, wherein a resistor R16 and a resistor R13 are sequentially connected between the in-phase input end of the operational amplifier U2 and a voltage end VCC1, one end of the resistor R16, which is connected with the resistor R13, is connected with an inter-ground series resistor R14, the inverting input end of the operational amplifier U2 is connected with an inter-ground series resistor R11, and the inverting input end of the operational amplifier U2 and the output end of the operational amplifier U2 are respectively connected to the positive electrode and the negative electrode of the power end of the pressure sensor interface J3.
4. The digital display low power consumption pressure gauge according to claim 1, wherein: pressure sensor power control circuit includes MOS pipe Q2, resistance R19, treater link ADPWR _ CTL and sensor power supply end 3V _AD, and sensor power supply end 3V _ADis connected pressure sensor interface circuit, treater link ADPWR _ CTL are connected microprocessor, MOS pipe Q2 ' S the G utmost point is connected with treater link ADPWR _ CTL, MOS pipe Q2 ' S the G utmost point and MOS pipe Q2 ' S the S utmost point series resistance R19, and MOS pipe Q2 ' S the S utmost point connects voltage end VCC2, and MOS pipe Q2 ' S the D utmost point is connected sensor power supply end 3V _ _AD.
5. The digital display low power consumption pressure gauge according to claim 1, wherein: the pressure sensor is a silicon piezoresistive pressure core body.
6. The digital display low power consumption pressure gauge according to claim 1, wherein: the microprocessor is a low power microprocessor.
7. The digital display low power consumption pressure gauge according to claim 1, wherein: the display unit comprises a segment code liquid crystal screen and a backlight control circuit connected with the segment code liquid crystal screen; the segment code liquid crystal display and the backlight control circuit are respectively connected with the microprocessor.
8. The digital display low power consumption pressure gauge according to claim 7, wherein: the segment code liquid crystal display comprises an MOS (metal oxide semiconductor) tube Q1, a processor connecting end BL _ CTRL and a plurality of resistors, wherein the processor connecting end BL _ CTRL is connected with the microprocessor, a G pole of the MOS tube Q1 is connected with the processor connecting end BL _ CTRL, a D pole of the MOS tube Q1 and the segment code liquid crystal display are connected with each other through a series resistor R10, an S pole of the MOS tube Q1 is connected with a voltage end VCC3, and an S pole of the MOS tube Q1 and a G pole of the MOS tube Q1 are connected with each other through a series resistor R18.
9. The digital display low power consumption pressure gauge according to claim 1, wherein: the power supply unit further comprises a battery voltage detection circuit, and the battery voltage detection circuit is respectively connected with the battery and the microprocessor of the main circuit unit.
10. The digital display low power consumption pressure gauge according to claim 9, wherein: the battery voltage detection circuit comprises a battery connecting end VBAT, a sampling voltage end VBAT _ AD and a plurality of resistors, wherein the battery connecting end VBAT is connected with the battery, and the sampling voltage end VBAT _ AD is connected with the microprocessor; the battery connecting end VBAT and the ground are sequentially connected with the resistor R5 and the resistor R6 in series, and the resistor R7 is connected between one end of the resistor R5 connected with the resistor R6 and the sampling voltage end VBAT _ AD in series.
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| CN202222795291.0U CN218276470U (en) | 2022-10-24 | 2022-10-24 | Digital display low-power consumption pressure gauge |
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| CN202222795291.0U CN218276470U (en) | 2022-10-24 | 2022-10-24 | Digital display low-power consumption pressure gauge |
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