CN115566786B - Handheld low-power-consumption temperature and humidity detector - Google Patents

Handheld low-power-consumption temperature and humidity detector Download PDF

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Publication number
CN115566786B
CN115566786B CN202211300473.4A CN202211300473A CN115566786B CN 115566786 B CN115566786 B CN 115566786B CN 202211300473 A CN202211300473 A CN 202211300473A CN 115566786 B CN115566786 B CN 115566786B
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Prior art keywords
power
power supply
circuit
resistor
conversion circuit
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CN115566786A (en
Inventor
林善平
林虹灏
潘卓睿
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Fujian Shunchang Hong Run Precision Instruments Co ltd
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Fujian Shunchang Hong Run Precision Instruments Co ltd
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Priority to CN202211300473.4A priority Critical patent/CN115566786B/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/005—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting using a power saving mode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

The invention discloses a handheld low-power-consumption temperature and humidity detector, which comprises a power supply unit and a main circuit unit; the power supply unit comprises a battery, an on-off detection circuit, a switching circuit and a power supply conversion circuit, wherein the battery, the on-off detection circuit and the switching circuit are sequentially connected; the main circuit unit comprises a microprocessor, a sensor interface circuit, a key module and the display module. According to the handheld low-power-consumption temperature and humidity detector, when the handheld low-power-consumption temperature and humidity detector is used for collecting, the DC-DC power supply conversion circuit and the LDO power supply conversion circuit are selected in a time-sharing mode, so that high-quality collection is guaranteed, and meanwhile, the power consumption of the handheld low-power-consumption temperature and humidity detector is low, so that the standby time of the detector is greatly prolonged, and the competitiveness of the detector is improved.

Description

Handheld low-power-consumption temperature and humidity detector
Technical Field
The invention relates to the field of temperature and humidity detection, in particular to a handheld low-power-consumption temperature and humidity detector.
Background
The handheld temperature and humidity detector at the present stage is generally powered by a mobile battery. The handheld temperature and humidity detector moves flexibly in a power supply mode of the mobile battery, and is convenient to use; however, the electric quantity of the mobile battery is usually smaller, the electricity duration of the handheld temperature and humidity detector is limited, and in order to prolong the electricity duration of the product as much as possible, the product is often required to have as low power consumption as possible, otherwise, the electric quantity of the battery can be consumed soon after the battery is assembled, and the product also lacks market competitiveness while the electric energy of the battery is wasted. The method for reducing the power consumption of similar products in the industry generally comprises the following steps: 1. the processor is a low-voltage and low-power-consumption processor; 2. when the processor stands by for a long time, the processor is switched to a sleep mode; 3. the backlight of the liquid crystal display is not operated for a long time, and the backlight is automatically extinguished or directly comprises a backlight switch button. Although the methods can play a certain role and have a certain energy-saving effect, compared with foreign products, certain gaps exist in the overall power consumption, and the overall energy-saving setting needs to be further improved.
Disclosure of Invention
The invention aims to provide a handheld low-power-consumption temperature and humidity detector.
The technical scheme for realizing the aim of the invention is as follows: a handheld low-power-consumption temperature and humidity detector comprises a power supply unit and a main circuit unit;
the power supply unit comprises a battery, a switching machine detection circuit, a switching circuit and a power supply conversion circuit, wherein the battery, the switching machine detection circuit and the switching circuit are sequentially connected, the power supply conversion circuit comprises a DC-DC power supply conversion circuit and an LDO power supply conversion circuit, the DC-DC power supply conversion circuit and the LDO power supply conversion circuit in the power supply conversion circuit are respectively connected with the switching circuit, and the DC-DC power supply conversion circuit and the LDO power supply conversion circuit in the power supply conversion circuit are also respectively connected with the main circuit unit;
the main circuit unit comprises a microprocessor, a sensor interface circuit, a key module and a display module, wherein the sensor interface circuit, the key module, the display module, the power-on/off detection circuit and the switching circuit of the power supply unit are respectively connected with the microprocessor, and the key module is also connected with the power-on/off detection circuit of the power supply unit.
The on-off detection circuit in the power supply unit is used for switching on or switching off a circuit after the key module performs on-off operation, so that an electric signal of the power supply unit is output or disconnected; the switching circuit is used for receiving a signal sent by the microprocessor, selecting one of the DC-DC power supply conversion circuit and the LDO power supply conversion circuit in the power supply conversion circuit to be conducted according to the signal sent by the microprocessor, so that an electric signal sent by the battery to the switching circuit is sent to the DC-DC power supply conversion circuit to be converted by the DC-DC power supply conversion circuit or is sent to the LDO power supply conversion circuit to be converted by the LDO power supply conversion circuit; the DC-DC power supply conversion circuit and the LDO power supply conversion circuit in the power supply conversion circuit are used for converting an input electric signal into a required electric signal, and then outputting the main circuit unit connected with the electric signal to supply power for the main circuit unit. The sensor interface circuit in the main circuit unit is used for accessing a temperature and humidity sensor; the microprocessor is used for matching with the operation of the key module to enable the on-off detection circuit to maintain an on-off state; and an instruction used for receiving the input of the key module; and the switching circuit is used for sending a signal to the switching circuit, so that the switching circuit is conducted with one of the DC-DC power supply switching circuit and the LDO power supply switching circuit, and the electric signal which is sent to the switching circuit by the battery is sent to the DC-DC power supply switching circuit, is converted by the DC-DC power supply switching circuit or is sent to the LDO power supply switching circuit, and is converted by the LDO power supply switching circuit; the temperature and humidity sensor is used for receiving a temperature and humidity sensor input by the sensor interface circuit; and the display module is used for sending a control signal to the display module to enable the display module to display or not display.
Further, the ON-off detection circuit comprises a diode D2, a diode D3, an NPN triode Q4, a MOS transistor Q3, a plurality of resistors, an ON-off KEY connection end key_power, a processor connection end key_pwrin, a processor connection end power_on, a battery connection end vcc_bat1 and a POWER supply output end vcc_out; the ON-off KEY connection end KEY_POWER is connected with the KEY module, the processor connection end KEY_PWRIN and the processor connection end POWER_ON are respectively connected with the microprocessor, the battery connection end VCC_BAT1 is connected with the battery, and the POWER supply output end VCC_out is connected with the switching circuit; the positive pole of the diode D2 is connected with the processor connecting end KEY_PWRIN, a resistor R19 is connected in series between the positive pole of the diode D2 and the voltage end VCC1, the negative pole of the diode D2 and the negative pole of the diode D3 are respectively connected with the switch button connecting end KEY_POWER, the positive pole of the diode D3 is connected with the collector of the NPN triode Q4, a resistor R24 is connected in series between the base of the NPN triode Q4 and the processor connecting end POWER_ON, a resistor R25 is connected in series between the base of the NPN triode Q4 and the emitter of the NPN triode Q4, an emitter of the NPN triode Q4 is grounded, the positive pole of the diode D3 is connected with the G-pole series resistor R22 of the MOS tube Q3, the S pole of the MOS tube Q3 is connected with the battery connecting end VCC_BAT1, and the D pole of the MOS tube Q3 is connected with the POWER output end VCC_out.
Further, the DC-DC power conversion circuit is constituted by a buck-type DC-DC power chip.
Further, the LDO power conversion circuit adopts a chip with the model number of TPL810F33-89 TR.
Further, the power supply unit further includes a battery voltage detection circuit 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 display so as to remind a user whether the battery needs to be replaced or not, so that the handheld low-power-consumption temperature and humidity detector has stronger functionality.
Further, the battery voltage detection circuit comprises a battery connection end VCC_BAT2, a sampling voltage end VBAT_AD and a plurality of resistors, wherein the battery connection end VCC_BAT2 is connected with the battery, and the sampling voltage end VBAT_AD is connected with the microprocessor; the battery connection terminal VCC_BAT2 is connected with the ground in series with a resistor R18 and a resistor R23, and the end, connected with the resistor R23, of the resistor R18 is connected with the sampling voltage terminal VBAT_AD in series with a resistor R21.
Further, the microprocessor is a low power 16-bit processor.
Further, the Sensor interface circuit includes a MOS tube Q2, a plurality of resistors, a processor connection end v3_CTRL and a Sensor power supply end v3_sensor, the processor connection end v3_CTRL is connected with the microprocessor, a G pole of the MOS tube Q2 is connected with the processor connection end v3_CTRL, a series resistor R17 is connected between the G pole of the MOS tube Q2 and a voltage end VCC2, an S pole of the MOS tube Q2 is connected with the voltage end VCC2, an S pole of the MOS tube Q2 is connected with a D pole of the MOS tube Q2 in series resistor R5, and a D pole of the MOS tube Q2 is connected with the Sensor power supply end v3_sensor. When the temperature and humidity Sensor is connected, the temperature and humidity Sensor is connected to the power supply end V3-Sensor of the Sensor.
Further, the display module comprises a segment code liquid crystal screen and a backlight control circuit connected with the segment code liquid crystal screen; and the segment code liquid crystal screen and the backlight control circuit are respectively connected with the microprocessor.
Further, the segment code liquid crystal screen comprises a 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, the G pole of the MOS tube Q1 is connected with the processor connecting end BL_CTRL, a resistor R12 is connected in series between the D pole of the MOS tube Q1 and the segment code liquid crystal screen, the S pole of the MOS tube Q1 is connected with a voltage end VCC3, and a resistor R16 is connected in series between the S pole of the MOS tube Q1 and the G pole of the MOS tube Q1.
According to the handheld low-power-consumption temperature and humidity detector, on one hand, through the arrangement of the DC-DC power conversion circuit and the LDO power conversion circuit in the power conversion circuit, when the acquisition is performed, the LDO power conversion circuit suitable for acquisition can be used for converting power supply, and when the acquisition is not performed, the DC-DC power conversion circuit with low power consumption can be used for converting power supply, so that the DC-DC power conversion circuit and the LDO power conversion circuit are selected in a time sharing manner, and the power consumption of the handheld low-power-consumption temperature and humidity detector is lower while the high-quality acquisition is ensured; on the other hand, through the connection setting of the sensor interface circuit and the microprocessor, whether the sensor interface circuit is electrified or not can be controlled by the microprocessor, so that when the key module is not operated for a long time or temperature and humidity are not required to be acquired, the sensor interface circuit can be controlled by the microprocessor, the sensor interface circuit is not conducted, the temperature and humidity sensor is not powered, and the power is cut off, so that the power consumption is reduced. According to the handheld low-power-consumption temperature and humidity detector, on the basis of the existing low-power-consumption design, the whole power consumption condition of equipment in the using process is reduced by further adopting the power-saving design of converting the power supply conversion circuit and supplying power to the temperature and humidity sensor, so that the standby time of the instrument is greatly prolonged, and the competitiveness of the instrument is improved.
Drawings
FIG. 1 is a functional block diagram of a handheld low-power-consumption temperature and humidity detector of the invention;
FIG. 2 is a schematic diagram of the on-off detection circuit of the handheld low-power-consumption temperature and humidity detector;
FIG. 3 is a schematic diagram of a battery voltage detection circuit of the handheld low-power-consumption temperature and humidity detector;
FIG. 4 is a schematic diagram of the sensor interface circuit of the handheld low-power consumption temperature and humidity detector of the present invention;
fig. 5 is a schematic structural diagram of a display module of the handheld low-power-consumption temperature and humidity detector of the invention.
Detailed Description
The following describes in detail the specific embodiments of the handheld low-power consumption temperature and humidity detector according to the present invention with reference to the accompanying drawings:
as shown in fig. 1, a handheld low-power-consumption temperature and humidity detector comprises a power supply unit 1 and a main circuit unit 2;
the power supply unit 1 comprises a battery 11, a switching machine detection circuit 12, a switching circuit 13 and a power supply conversion circuit 14, wherein the battery 11, the switching machine detection circuit 12 and the switching circuit 13 are sequentially connected, the power supply conversion circuit 14 comprises a DC-DC power supply conversion circuit 141 and an LDO power supply conversion circuit 142, the DC-DC power supply conversion circuit 141 and the LDO power supply conversion circuit 142 in the power supply conversion circuit 14 are respectively connected with the switching circuit 13, and the DC-DC power supply conversion circuit 141 and the LDO power supply conversion circuit 142 in the power supply conversion circuit 14 are also connected with the main circuit unit 2;
the main circuit unit 2 includes a microprocessor 21, a sensor interface circuit 22, a key module 23 and the display module 24, wherein the sensor interface circuit 22, the key module 23, the display module 24, the on-off detection circuit 12 and the switching circuit 13 of the power supply unit 1 are respectively connected with the microprocessor 21, and the key module 23 is also connected with the on-off detection circuit 12 of the power supply unit 1.
The handheld low-power-consumption temperature and humidity detector is characterized in that a power supply unit 1 is connected with a main circuit unit 2 to provide power for the main circuit unit 2, and specifically, the power supply is connected into each circuit through a voltage end VCC1, a voltage end VCC2, a voltage end VCC3 and the like.
The invention discloses a handheld low-power-consumption temperature and humidity detector, wherein a battery 11 in a power supply unit 1 is an energy storage unit; the on-off detection circuit 12 plays a role of switching on or off a circuit after the key module 23 performs an on-off operation, so as to output or off an electric signal of the power supply unit 1; the battery 11, the on-off detection circuit 12 and the switching circuit 13 are sequentially connected, after the key module 23 is started, the on-off detection circuit 12 is in a continuous conduction state under the action of the microprocessor 21, and an electric signal of the battery 11 is transmitted to the switching circuit 13 after passing through the on-off detection circuit 12; the switching circuit 13 is connected to the microprocessor 21, and the switching circuit 13 is configured to receive a signal sent by the microprocessor 21, and select to be conducted with one of the DC-DC power conversion circuit 141 and the LDO power conversion circuit 142 in the power conversion circuit 14 according to the signal sent by the microprocessor 21, so that an electrical signal sent by the battery 11 to the switching circuit 13 is sent to the DC-DC power conversion circuit 141, converted by the DC-DC power conversion circuit 141, or sent to the LDO power conversion circuit 142, and converted by the LDO power conversion circuit 142; the DC-DC power conversion circuit 141 and the LDO power conversion circuit 142 in the power conversion circuit 14 are both configured to convert an input electrical signal into a desired electrical signal, and output the main circuit unit 2 connected thereto to supply power to the main circuit unit 2.
The sensor interface circuit 22 in the main circuit unit 2 is used for being connected with the temperature and humidity sensor 10. The key module 23 is used for performing a switching operation and inputting instructions. The microprocessor 21 is configured to cooperate with the operation of the key module 23 to enable the on/off detection circuit 12 to maintain an on/off state; and an instruction for receiving the input of the key module 23; and for sending a signal to the switching circuit 13, so that the switching circuit 13 is turned on with one of the DC-DC power conversion circuit 141 and the LDO power conversion circuit 142, and an electric signal sent from the battery 11 to the switching circuit 13 is sent to the DC-DC power conversion circuit 141, converted by the DC-DC power conversion circuit 141, or sent to the LDO power conversion circuit 142, and converted by the LDO power conversion circuit 142; and is configured to send a control signal to the sensor interface circuit 22, so as to collect the temperature and humidity sensed by the temperature and humidity sensor 10 connected to the sensor interface circuit 22; and is configured to send a control signal to the display module 24 to cause the display module 24 to display or not display.
When the handheld low-power-consumption temperature and humidity detector is used, the sensor interface circuit 22 in the main circuit unit 2 is connected to the temperature and humidity sensor 10. Then, the on/off detection circuit 12 is turned on or off by the key module 23. Specifically, when the power-on/off detection circuit 12 is turned on, the electric signal of the battery 11 is transmitted to the switching circuit 13 after passing through the power-on/off detection circuit 12; the switching circuit 13 is turned on with the DC-DC power supply conversion circuit 141, and an electric signal supplied from the battery 11 to the switching circuit 13 is supplied to the DC-DC power supply conversion circuit 141, converted by the DC-DC power supply conversion circuit 141 into a desired electric signal, and then outputted to the main circuit unit 2 connected thereto, thereby supplying power to the main circuit unit 2. After the microprocessor 21 is powered on, the on/off detection circuit 12 is maintained in a conductive state under the action of the microprocessor 21.
In the handheld low-power-consumption temperature and humidity detector disclosed by the invention, when the on-off detection circuit 12 is maintained in a conducting state and temperature and humidity are required to be acquired, a related instruction is input through the key module 23, the microprocessor 21 receives the related instruction input by the key module 23 and then sends a signal to the switching circuit 13, so that the switching circuit 13 is conducted with the LDO power supply conversion circuit 142, an electric signal transmitted to the switching circuit 13 by the battery 11 is transmitted to the LDO power supply conversion circuit 142, and the LDO power supply conversion circuit 142 converts the electric signal into a required electric signal and then outputs the main circuit unit 2 connected with the electric signal to supply power to the main circuit unit 2; meanwhile, the microprocessor 21 sends a control signal to the sensor interface circuit 22, the sensor interface circuit 22 is turned on, and a temperature and humidity signal sensed by the temperature and humidity sensor 10 connected to the sensor interface circuit 22 is sent to the microprocessor 21 for collection; during collection, the microprocessor 21 may also send a collection signal to the display module 24 for display according to the display requirement input by the key module 23.
In the handheld low-power-consumption temperature and humidity detector of the invention, the display content of the display module 24 can be converted by the microprocessor 21 according to the instruction input of the key module 23.
According to the handheld low-power-consumption temperature and humidity detector, when the key module 23 is not operated for a long time, the microprocessor 21 automatically sends a control signal to the display module 24 to turn off the display module 24; meanwhile, the microprocessor 21 further sends signals to the switching circuit 13 and the sensor interface circuit 22, so that the switching circuit 13 is connected with the DC-DC power supply conversion circuit 141, the switching circuit is switched back to be converted and powered by the DC-DC power supply conversion circuit 141, the sensor interface circuit 22 is disconnected, and the temperature and humidity signals sensed by the temperature and humidity sensor 10 connected with the sensor interface circuit 22 are not sent to the microprocessor 21 for collection.
When the handheld low-power-consumption temperature and humidity detector does not need to collect temperature and humidity any more, a related instruction can be input through the key module 23, the microprocessor 21 receives the related instruction input by the key module 23 and then sends a signal to the switching circuit 13, so that the switching circuit 13 is conducted with the DC-DC power supply conversion circuit 141, and an electric signal transmitted to the switching circuit 13 by the battery 11 is transmitted to the DC-DC power supply conversion circuit 141 and is switched back to be converted and supplied by the DC-DC power supply conversion circuit 141; meanwhile, the microprocessor 21 sends a control signal to the sensor interface circuit 22, the sensor interface circuit 22 is disconnected, and the temperature and humidity signal sensed by the temperature and humidity sensor 10 connected to the sensor interface circuit 22 is not sent to the microprocessor 21 for collection.
According to the handheld low-power-consumption temperature and humidity detector, when the handheld low-power-consumption temperature and humidity detector is not used for collecting, the DC-DC power supply conversion circuit 141 converts power supply to supply power. The DC-DC power conversion circuit 141 operates on the principle that the DC voltage input from the battery 11 is first converted into ac, and then the ac is directly converted back into DC by the integrating filter circuit at the output end. The DC-DC power conversion circuit 141 is suitable for low power consumption design, that is, when the DC-DC power conversion circuit 141 converts power, the power consumption is low, and the equipment has longer standby time.
In the handheld low-power-consumption temperature and humidity detector, the LDO power supply conversion circuit 142 converts power supply to supply power during acquisition. The LDO power conversion circuit 142 supports a wide voltage input, fixes a low voltage output, and belongs to a low dropout linear circuit. The LDO power conversion circuit 142 has the advantages of simple circuit, low cost, low noise and low ripple, and the output voltage is very suitable for signal acquisition, although the energy loss is large in the voltage conversion process.
According to the handheld low-power-consumption temperature and humidity detector, on one hand, through the arrangement of the DC-DC power conversion circuit 141 and the LDO power conversion circuit 142 in the power conversion circuit 14, power can be converted by the LDO power conversion circuit 142 suitable for collection when the power is collected, and the DC-DC power conversion circuit 141 with low power consumption can be used for converting the power when the power is not collected, so that the DC-DC power conversion circuit 141 and the LDO power conversion circuit 142 are selected in a time sharing way, and the power consumption of the handheld low-power-consumption temperature and humidity detector is lower while the high-quality collection is ensured; on the other hand, through the connection arrangement between the sensor interface circuit 22 and the microprocessor 21, whether the sensor interface circuit 22 is powered on or not can be controlled by the microprocessor 21, so that when the key module 23 is not operated for a long time or the temperature and humidity are not required to be collected, the sensor interface circuit 22 can be controlled by the microprocessor 21, the sensor interface circuit 22 is not conducted, the temperature and humidity sensor 10 is not powered on and is in a power-off state, and therefore power consumption is reduced.
According to the handheld low-power-consumption temperature and humidity detector, on the basis of the existing low-power-consumption design, the whole power consumption condition of equipment in the using process is reduced by further converting the power supply conversion circuit 14 and the power saving design of the temperature and humidity sensor 10, so that the standby time of the instrument is greatly prolonged, and the competitiveness of the instrument is improved.
In the handheld low-POWER-consumption temperature and humidity detector of the present invention, as shown in fig. 2, the ON-off detection circuit 12 includes a diode D2, a diode D3, an NPN transistor Q4, a MOS transistor Q3, a plurality of resistors, an ON-off KEY connection terminal key_power, a processor connection terminal key_pwrin, a processor connection terminal power_on, a battery connection terminal vcc_bat1, and a POWER output terminal vcc_out; wherein, a key_power connection end key_power is connected to the KEY module 23, a processor connection end key_pwrin and a processor connection end power_on are respectively connected to the microprocessor 21, a battery connection end vcc_bat1 is connected to the battery 11, and a POWER output end vcc_out is connected to the switching circuit 13; the positive pole of the diode D2 is connected with the processor connecting end KEY_PWRIN, a resistor R19 is connected in series between the positive pole of the diode D2 and the voltage end VCC1, the negative pole of the diode D2 and the negative pole of the diode D3 are respectively connected with the switch button connecting end KEY_POWER, the positive pole of the diode D3 is connected with the collector of the NPN triode Q4, a resistor R24 is connected in series between the base of the NPN triode Q4 and the processor connecting end POWER_ON, a resistor R25 is connected in series between the base of the NPN triode Q4 and the emitter of the NPN triode Q4, an emitter of the NPN triode Q4 is grounded, the positive pole of the diode D3 is connected with the G-pole series resistor R22 of the MOS tube Q3, the S pole of the MOS tube Q3 is connected with the battery connecting end VCC_BAT1, and the D pole of the MOS tube Q3 is connected with the POWER output end VCC_out.
The handheld low-power-consumption temperature and humidity detector operates the key module 23 when the handheld low-power-consumption temperature and humidity detector is started; because the other end of the on-off button in the button module 23 is grounded, after the on-off button is pressed down, the on-off button connection end key_power is at a low level, at this time, the processor connection end key_pwrin pulled up by the battery connection end vcc_bat1 is also changed from a high voltage to a low level state, meanwhile, the collector electrode of the NPN triode Q4 and the G electrode of the MOS tube Q3 which are originally at a high level are both changed to a low level, the MOS tube Q3 is turned on, the battery connection end vcc_bat1 and the POWER supply output end vcc_out are turned on for output, and the main circuit unit 2 is powered on; after the main circuit unit 2 is powered ON, the microprocessor 21 works, the microprocessor 21 outputs a high level to the processor connection end power_on, the NPN transistor Q4 is turned ON, and since the emitter of the NPN transistor Q4 is grounded, the collector of the turned-ON NPN transistor Q4 is always in a low level state, and then the ON/off detecting circuit 12 can still maintain a turned-ON state after the ON/off button is pressed and lifted.
In the handheld low-POWER-consumption temperature and humidity detector disclosed by the invention, when the handheld low-POWER-consumption temperature and humidity detector is turned off, the KEY module 23 is operated, specifically, the ON-off KEY is pressed down, the ON-off KEY connection end KEY_POWER is changed from high level to low level again, at the moment, after recognizing that the level of the processor connection end KEY_PWRIN changes, the microprocessor 21 pulls down the level of the processor connection end POWER_ON, the NPN triode Q4 is in a non-saturated state, the collector electrode of the NPN triode Q4 is restored to high level, the G electrode of the MOS tube Q3 is also changed to high level, the MOS tube Q3 is disconnected, and a passage between the battery connection end VCC_BAT1 and the POWER output end VCC_out is cut off, so that no output is generated.
In the handheld low-power-consumption temperature and humidity detector of the present invention, the DC-DC power conversion circuit 141 is preferably composed of a step-down DC-DC power chip.
In the handheld low-power-consumption temperature and humidity detector of the invention, the LDO power supply conversion circuit 142 preferably adopts a voltage stabilizer chip with the model number of TPL810F33-89 TR.
In the handheld low-power-consumption temperature and humidity detector of the present invention, preferably, the power supply unit 1 further includes a battery voltage detection circuit 15, and the battery voltage detection circuit 15 is respectively connected with the battery 11 and the microprocessor 21 of the main circuit unit 2. The battery voltage detection circuit 15 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 transmitted from the battery voltage detection circuit 15 to the display module 24 for display, so as to remind the user whether to replace the battery, so that the handheld low-power-consumption temperature and humidity detector has more powerful functionality.
As shown in fig. 3, the battery voltage detection circuit 15 includes a battery connection end vcc_bat2, a sampling voltage end vbat_ad, and a plurality of resistors, the battery connection end vcc_bat2 is connected to the battery 11, and the sampling voltage end vbat_ad is connected to the microprocessor 21; the battery connection terminal VCC_BAT2 is connected with the ground in series with a resistor R18 and a resistor R23, and the end, connected with the resistor R23, of the resistor R18 is connected with the sampling voltage terminal VBAT_AD in series with a resistor R21.
According to the handheld low-power-consumption temperature and humidity detector, the resistor R18 and the resistor R23 form the voltage dividing circuit, when the voltage signal of the battery connection end VCC_BAT2 is acquired through the voltage dividing circuit, the magnitude of the acquired value can be controlled through the ratio of the resistor R18 to the resistor R23, so that the acquired value accords with the interface of the microprocessor 21, and meanwhile, the design can be more flexible and convenient due to the ratio adjustment of the resistor R18 and the resistor R23.
In the handheld low-power-consumption temperature and humidity detector of the present invention, preferably, the microprocessor 21 is a low-power-consumption 16-bit processor. The microprocessor 21 may be a 16-bit processor or a 32-bit processor, and in the low-power-consumption temperature and humidity detector, the interfaces required by the microprocessor 21 are not more, the processing requirements of the microprocessor 21 are not too high, and compared with a high-cost 32-bit processor, a low-cost and low-power-consumption 16-bit processor is more suitable.
In the handheld low-power-consumption temperature and humidity detector of the invention, as shown in fig. 4, preferably, the Sensor interface circuit 22 comprises a MOS transistor Q2, a plurality of resistors, a processor connection end v3_ctrl and a Sensor power supply end v3_sensor, the processor connection end v3_ctrl is connected with the microprocessor 21, a G electrode of the MOS transistor Q2 is connected with the processor connection end v3_ctrl, a resistor R17 is connected between the G electrode of the MOS transistor Q2 and a voltage end VCC2 in series, an S electrode of the MOS transistor Q2 is connected with the voltage end VCC2, an S electrode of the MOS transistor Q2 is connected with a D electrode of the MOS transistor Q2 in series with a resistor R5, and a D electrode of the MOS transistor Q2 is connected with the Sensor power supply end v3_sensor.
According to the handheld low-power-consumption temperature and humidity detector, when the temperature and humidity Sensor 10 is connected, the temperature and humidity Sensor 10 is connected to the power supply end V3-Sensor of the Sensor. The electrode G of the MOS transistor Q2 is connected to the processor connection end v3_ctrl and is connected to the microprocessor 21, and whether the MOS transistor Q2 is turned on or not is controlled by the microprocessor 21, that is, whether the voltage end VCC2 is connected to the Sensor power supply end v3_sensor is controlled by the microprocessor 21, so that the microprocessor 21 is convenient to control the power supply of the temperature and humidity Sensor 10, thereby facilitating the power saving setting.
In the handheld low-power-consumption temperature and humidity detector of the invention, preferably, the display module 24 comprises a segment code liquid crystal screen 241 and a backlight control circuit 242 connected with the segment code liquid crystal screen 241; the segment code liquid crystal screen 241 and the backlight control circuit 242 are each connected to the microprocessor 21. The display module 24 may be an LED liquid crystal screen or a segment code liquid crystal screen, and since the handheld low-power consumption temperature and humidity detector has less display data and lower display accuracy, the segment code liquid crystal screen with lower cost is more beneficial to control the production cost.
In the handheld low-power-consumption temperature and humidity detector of the invention, as shown in fig. 5, preferably, the segment code liquid crystal screen 241 comprises a MOS tube Q1, a processor connection end bl_ctrl and a plurality of resistors, the processor connection end bl_ctrl is connected with the microprocessor 21, the G pole of the MOS tube Q1 is connected with the processor connection end bl_ctrl, a resistor R12 is connected in series between the D pole of the MOS tube Q1 and the segment code liquid crystal screen 241, the S pole of the MOS tube Q1 is connected with a voltage end VCC3, and the S pole of the MOS tube Q1 and the G pole of the MOS tube Q1 are connected in series with a resistor R16.
According to the handheld low-power-consumption temperature and humidity detector disclosed by the invention, the G pole of the MOS tube Q1 is connected with the processor connecting end BL_CTRL and is connected with the microprocessor 21, whether the MOS tube Q1 is conducted or not is controlled by the microprocessor 21, namely, whether the voltage end VCC3 supplies power for the segment code liquid crystal screen 241 can be controlled, so that the microprocessor 21 can conveniently control the backlight power supply of the segment code liquid crystal screen 241, and the electricity saving setting is facilitated.
According to the handheld low-power-consumption temperature and humidity detector, the resistors in each circuit play a role in limiting current.
It should be understood by those skilled in the art that the present invention may be embodied in many different forms without departing from the spirit or essential characteristics thereof.

Claims (9)

1. A handheld low-power-consumption temperature and humidity detector comprises a power supply unit and a main circuit unit; the method is characterized in that:
the power supply unit comprises a battery, a switching machine detection circuit, a switching circuit and a power supply conversion circuit, wherein the battery, the switching machine detection circuit and the switching circuit are sequentially connected, the power supply conversion circuit comprises a DC-DC power supply conversion circuit and an LDO power supply conversion circuit, the DC-DC power supply conversion circuit and the LDO power supply conversion circuit in the power supply conversion circuit are respectively connected with the switching circuit, and the DC-DC power supply conversion circuit and the LDO power supply conversion circuit in the power supply conversion circuit are also respectively connected with the main circuit unit;
the main circuit unit comprises a microprocessor, a sensor interface circuit, a key module and a display module, wherein the sensor interface circuit, the key module, the display module, the on-off detection circuit and the switching circuit of the power supply unit are respectively connected with the microprocessor, and the key module is also connected with the on-off detection circuit of the power supply unit;
the ON-off detection circuit comprises a diode D2, a diode D3, an NPN triode Q4, a MOS tube Q3, a resistor R19, a resistor R20, a resistor R22, a resistor R24, a resistor R25, a capacitor C15, an ON-off KEY connection end KEY_POWER, a processor connection end KEY_PWRIN, a processor connection end POWER_ON, a battery connection end VCC_BAT1 and a POWER supply output end VCC_out; the ON-off KEY connection end KEY_POWER is connected with the KEY module, the processor connection end KEY_PWRIN and the processor connection end POWER_ON are respectively connected with the microprocessor, the battery connection end VCC_BAT1 is connected with the battery, and the POWER supply output end VCC_out is connected with the switching circuit; the positive electrode of the diode D2 is connected with the processor connecting end KEY_PWRIN, a resistor R19 is connected in series between the positive electrode of the diode D2 and the voltage end VCC1, the negative electrode of the diode D2 and the negative electrode of the diode D3 are both connected with the switch button connecting end KEY_POWER, the positive electrode of the diode D3 is connected with the collector of the NPN triode Q4, a resistor R24 is connected in series between the base of the NPN triode Q4 and the processor connecting end POWER_ON, a resistor R25 is connected in series between the base of the NPN triode Q4 and the emitter of the NPN triode Q4, the emitter of the NPN triode Q4 is grounded, the positive electrode of the diode D3 is connected with the G-pole series resistor R22 of the MOS tube Q3, the S electrode of the MOS tube Q3 is connected with the battery connecting end VCC_BAT1, and the D electrode of the MOS tube Q3 is connected with the POWER output end VCC_out;
when the on-off detection circuit is maintained in a conducting state and temperature and humidity are required to be acquired, a related instruction is input through the key module, the microprocessor receives the related instruction input by the key module and then sends a signal to the switching circuit to enable the switching circuit to be conducted with the LDO power supply conversion circuit, an electric signal transmitted to the switching circuit by the battery is transmitted to the LDO power supply conversion circuit, the LDO power supply conversion circuit converts the electric signal into a required electric signal, and then the main circuit unit connected with the electric signal is output to supply power to the main circuit unit;
when the key module is not operated for a long time, the microprocessor automatically sends a control signal to the display module to turn off the display module; meanwhile, the microprocessor also sends signals to the switching circuit and the sensor interface circuit, so that the switching circuit is conducted with the DC-DC power supply conversion circuit and is switched back to be converted and powered by the DC-DC power supply conversion circuit, the sensor interface circuit is disconnected, and temperature and humidity signals sensed by a temperature and humidity sensor connected with the sensor interface circuit are not sent to the microprocessor for collection.
2. The handheld low-power consumption temperature and humidity detector according to claim 1, wherein: the DC-DC power supply conversion circuit is composed of a buck DC-DC power supply chip.
3. The handheld low-power consumption temperature and humidity detector according to claim 1, wherein: the LDO power conversion circuit adopts a chip with the model of TPL810F33-89 TR.
4. The handheld low-power consumption temperature and humidity detector according to claim 1, wherein: the power supply unit further comprises a battery voltage detection circuit which is respectively connected with the battery and the microprocessor of the main circuit unit.
5. The handheld low-power consumption temperature and humidity detector according to claim 4, wherein: the battery voltage detection circuit comprises a battery connection end VCC_BAT2, a sampling voltage end VBAT_AD, a resistor R18, a resistor R21 and a resistor R23, wherein the battery connection end VCC_BAT2 is connected with the battery, and the sampling voltage end VBAT_AD is connected with the microprocessor; the battery connection terminal VCC_BAT2 is connected with the ground in series with a resistor R18 and a resistor R23, and the end, connected with the resistor R23, of the resistor R18 is connected with the sampling voltage terminal VBAT_AD in series with a resistor R21.
6. The handheld low-power consumption temperature and humidity detector according to claim 1, wherein: the microprocessor is a low power 16-bit processor.
7. The handheld low-power consumption temperature and humidity detector according to claim 1, wherein: the Sensor interface circuit comprises a MOS tube Q2, a resistor R17, a resistor R5, a processor connecting end V3-CTRL and a Sensor power supply end V3-Sensor, wherein the processor connecting end V3-CTRL is connected with the microprocessor, the G electrode of the MOS tube Q2 is connected with the processor connecting end V3-CTRL, a resistor R17 is connected between the G electrode of the MOS tube Q2 and a voltage end VCC2 in series, the S electrode of the MOS tube Q2 is connected with the voltage end VCC2, the S electrode of the MOS tube Q2 is connected with the D electrode of the MOS tube Q2 in series with the resistor R5, and the D electrode of the MOS tube Q2 is connected with the Sensor power supply end V3-Sensor.
8. The handheld low-power consumption temperature and humidity detector according to claim 1, wherein: the display module comprises a segment code liquid crystal screen and a backlight control circuit connected with the segment code liquid crystal screen; and the segment code liquid crystal screen and the backlight control circuit are respectively connected with the microprocessor.
9. The handheld low-power consumption temperature and humidity detector according to claim 8, wherein: the backlight control circuit that the section sign indicating number LCD screen is connected includes MOS pipe Q1, processor link BL_CTRL and resistance R12, resistance R16, and processor link BL_CTRL is connected microprocessor, MOS pipe Q1 ' S G utmost point is connected with processor link BL_CTRL, MOS pipe Q1 ' S D utmost point and section sign indicating number LCD screen series connection resistance R12, MOS pipe Q1 ' S S utmost point connection voltage end VCC3, MOS pipe Q1 ' S S utmost point and MOS pipe Q1 ' S G interelectrode series connection resistance R16.
CN202211300473.4A 2022-10-24 2022-10-24 Handheld low-power-consumption temperature and humidity detector Active CN115566786B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105141132A (en) * 2015-09-06 2015-12-09 马建权 Time-sharing power supply control circuit
CN211236731U (en) * 2019-11-21 2020-08-11 肇庆小鹏汽车有限公司 Vehicle, battery simulator and single-channel circuit thereof
CN114441846A (en) * 2022-02-11 2022-05-06 江苏三目视迅科技有限公司 High-precision voltage detection control circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220311358A1 (en) * 2021-03-24 2022-09-29 University Of North Texas High surface area reverse electrowetting for a self powered wireless wearable motion sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105141132A (en) * 2015-09-06 2015-12-09 马建权 Time-sharing power supply control circuit
CN211236731U (en) * 2019-11-21 2020-08-11 肇庆小鹏汽车有限公司 Vehicle, battery simulator and single-channel circuit thereof
CN114441846A (en) * 2022-02-11 2022-05-06 江苏三目视迅科技有限公司 High-precision voltage detection control circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
一种基于单片机的风压温湿度检测仪的设计;金鑫等;仪表技术(09);第20-22页 *

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