CN111624304A - Low-voltage control circuit for indoor humidity detection and temperature drift suppression method thereof - Google Patents
Low-voltage control circuit for indoor humidity detection and temperature drift suppression method thereof Download PDFInfo
- Publication number
- CN111624304A CN111624304A CN202010393773.6A CN202010393773A CN111624304A CN 111624304 A CN111624304 A CN 111624304A CN 202010393773 A CN202010393773 A CN 202010393773A CN 111624304 A CN111624304 A CN 111624304A
- Authority
- CN
- China
- Prior art keywords
- resistor
- pin
- capacitor
- voltage
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 70
- 230000001629 suppression Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000003381 stabilizer Substances 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 151
- 230000005540 biological transmission Effects 0.000 claims description 19
- 230000008054 signal transmission Effects 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 8
- 101710179738 6,7-dimethyl-8-ribityllumazine synthase 1 Proteins 0.000 claims description 4
- 101710186608 Lipoyl synthase 1 Proteins 0.000 claims description 4
- 101710137584 Lipoyl synthase 1, chloroplastic Proteins 0.000 claims description 4
- 101710090391 Lipoyl synthase 1, mitochondrial Proteins 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000003111 delayed effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Power Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a low-voltage control circuit for indoor humidity detection and a temperature drift suppression method thereof, wherein the low-voltage control circuit comprises the following steps: the device comprises a power supply conversion module, a humidity detection module, an alarm module, a signal conversion module, a timing trigger module and a relay control module, wherein a bridge type voltage stabilizing diode VD1 in the power supply conversion module converts the AC after voltage reduction into DC; a controllable voltage stabilizer U1 in the humidity detection module decomposes and stabilizes the excessive current; a triode Q2 in the alarm module receives a data signal fed back by the humidity sensor, and the triode is conducted when a set parameter value is exceeded; the signal conversion module converts the acquired humidity detection signal into an electric signal to control the operation of the timer U4; the resistor R11 and the resistor R12 in the timing trigger module are connected in series to increase the withstand voltage value of the timer U4; triode Q4 control relay K1's operation among the relay control module, and then adsorb relay normally open contact SB 1's closure, and then realize low pressure control high voltage equipment's operation.
Description
Technical Field
The invention relates to the technical field of low-voltage control, in particular to a low-voltage control circuit for indoor humidity detection and a temperature drift suppression method thereof.
Background
The low-voltage control circuit is a component device which can control the connection or disconnection of a circuit according to the external signal change requirement, further realize the switching, control, protection, detection, transformation and regulation of a circuit or a non-electric object, and can automatically or manually change the running state of the circuit according to the change of a detection signal, thereby controlling the running of the circuit, effectively preventing the high-voltage discharge phenomenon generated when the high-voltage device runs by low-voltage control, and reducing the electric shock accidents generated when a person operates.
When the existing indoor humidity detection low-voltage control circuit detects the humidity generated indoors, a humidity sensor can cause the temperature drift phenomenon of a humidity signal along with the temperature change of internal components, so that the inaccuracy of the humidity detection signal cannot maintain the operation of control equipment; when the humidity detection module is provided with the step-down voltage, the output current instability phenomenon of alternating current and direct current in conversion can be generated, so that the detection equipment can not stabilize the stability of the output current when running in high current; when the data signal detected by the humidity sensor exceeds a humidity set parameter value, the alarm cannot be rapidly prompted, so that the humidity detection circuit is overloaded to operate, and the practical service life is reduced; when the converted electric signal is delayed and responded, redundant frequency bands in the signal cannot be filtered, the withstand voltage value of the timer cannot be increased, and the phenomena of instability of the output electric signal and insufficient withstand voltage value during timing are caused.
Disclosure of Invention
The purpose of the invention is as follows: a low-voltage control circuit for detecting indoor humidity is provided to solve the above problems.
The technical scheme is as follows: a low voltage control circuit for indoor humidity detection, comprising: the power supply conversion module is used for providing direct-current voltage for the humidity detection module so that the humidity conversion changes the on-off of the normally open contact SB1 of the relay;
the humidity detection module is used for collecting and sampling indoor humidity and controlling the transmission direction of a detection signal;
the alarm module is used for comparing data collected by the humidity sensor RS, and when the data exceed a humidity parameter value, the triode Q3 is conducted, so that the alarm circuit operates;
the signal conversion module is used for converting the humidity signal fed back by the humidity detection module into an electric signal;
the timing trigger module is used for acquiring the electric signals generated in the signal conversion module so as to control the operation of the timer U4 and further control the output of the output electric signals;
and the relay control module is used for controlling the on-off of the triode Q4 according to an electric signal fed back by the timing trigger module so as to realize the on-off of the relay K1.
According to one aspect of the invention, a transformer TR1 is adopted in the power conversion module for voltage reduction, and a bridge type voltage stabilizing diode VD1 converts the reduced alternating current into direct current, so that the normally open contact SB1 of the low-voltage control relay is closed;
when the output maximum current of the controllable voltage stabilizer U1 in the humidity detection module exceeds a set value, the exceeded current is decomposed and stabilized, so that the protection of the circuit is realized;
the audion Q2 and the audion Q3 in the alarm module receive data signals fed back by the humidity sensor, and the audion is conducted when a set parameter value is exceeded, so that an alarm prompt effect is started;
the signal conversion module converts the acquired humidity detection signal into an electric signal to control the operation of the timer U4;
the timing trigger module is grounded by using a capacitor C6 to form a filtering effect, and a resistor R11 and a resistor R12 are connected in series to increase the withstand voltage value of a timer U4;
triode Q4 control relay K1's operation among the relay control module, and then adsorb relay normally open contact SB 1's closure, and then realize low pressure control high voltage equipment's operation.
According to an aspect of the present invention, the temperature drift suppression unit includes a resistor R17, a diode D6, a resistor R18, a resistor R20, a resistor R21, an operational amplifier U5, a capacitor C8, a resistor R22, a controllable regulator U6, a capacitor C10, a capacitor C11, a capacitor C9, a resistor R23, a resistor R24, a resistor R25, and a capacitor C12, wherein one end of the resistor R17 is connected to a humidity signal input end Vit; the other end of the resistor R17 is respectively connected with the positive end of a diode D6 and one end of a resistor R18; the other end of the resistor R18 is respectively connected with one end of a resistor R21 and one end of a resistor R20; the other end of the resistor R20 is respectively connected with the cathode end of the diode D6 and the ground wire GND; the other end of the resistor R21 is respectively connected with a pin 3 of an operational amplifier U5 and one end of a capacitor C8; the other end of the capacitor C8 is respectively connected with a pin 6 of an operational amplifier U5, one end of a resistor R22 and a pin 2 of a controllable voltage stabilizer U6; the other end of the resistor R22 is connected with a pin 2 of an operational amplifier U5; pin 7 of the operational amplifier U5 is connected with +5.5V of a power supply; the pin 4 of the operational amplifier U5 is connected with a power supply of-5.5V; the pin 1 of the controllable voltage stabilizer U6 is respectively connected with the positive terminal of a capacitor C9, one end of a resistor R23 and one end of a resistor R24; the pin 3 of the controllable voltage stabilizer U6 is respectively connected with one end of a capacitor C11, the positive end of a capacitor C10 and a power supply + 5V; the negative end of the capacitor C10 is respectively connected with the other end of the capacitor C11 and a ground wire GND; the negative end of the capacitor C9 is connected with a ground wire GND; the other end of the resistor R23 is respectively connected with the other end of the resistor R24, one end of the resistor R25 and the humidity signal output end Vin; the other end of the resistor R25 is connected with one end of a capacitor C12; the other end of the capacitor C12 is connected with the ground line GND.
According to one aspect of the invention, the power conversion module comprises a fuse FU1, a fuse FU2, a transformer TR1, a diode D1, a relay normally-open contact SB1, a diode D2, a capacitor C1 and a bridge type voltage stabilizing diode VD1, wherein one end of the fuse FU1 is connected with the positive terminal of an alternating current AC 220V; the other end of the fuse FU1 is connected with a pin 2 of a transformer TR1 and the positive end of a diode D1 respectively; the negative end of the diode D1 is connected with one end of a normally open contact SB1 of the relay; the other end of the normally open contact SB1 of the relay is connected with the output end of the alternating current AC 220V; one end of the fuse FU2 is connected with the negative electrode end of the alternating current AC 220V; the other end of the fuse FU2 is connected with a pin 1 of a transformer TR1 and the positive end of a diode D2; the negative terminal of the diode D2 is connected with the output terminal of the alternating current AC 220V; pin 3 of the transformer TR1 is connected with pin 1 of a bridge type voltage stabilizing diode VD 1; pin 4 of the transformer TR1 is connected with pin 2 of a bridge type voltage stabilizing diode VD 1; the pin 3 of the bridge type voltage stabilizing diode VD1 is connected with one end of a capacitor C1; and the pin 4 of the bridge type voltage stabilizing diode VD1 is connected with the other end of the capacitor C1.
According to one aspect of the invention, the humidity detection module comprises a controllable voltage stabilizer U1, a resistor R5, a resistor R6, a diode D4, a variable resistor RV2, an operational amplifier U2, a resistor R3, a resistor R4, a diode D3, a resistor R2, a variable resistor RV1, an inductor L1, a triode Q1, a resistor R1, and a humidity sensor RS, wherein a pin 2 of the controllable voltage stabilizer U1 is respectively connected with one end of the resistor R6, an anode end of the diode D4, a pin 7 of the operational amplifier U2, one end of the resistor R3, one end of the resistor R2, one end of the inductor L1, a pin 4 of a bridge type voltage stabilizing diode VD1, and the other end of a capacitor C1; the pin 3 of the controllable voltage stabilizer U1 is respectively connected with one end of a resistor R5, one end of a resistor R4, a pin 4 of an operational amplifier U2, a pin 3 of a bridge type voltage stabilizing diode VD1 and one end of a capacitor C1; the pin 1 of the controllable voltage stabilizer U1 is respectively connected with the other end of the resistor R6 and the other end of the resistor R5; the negative end of the diode D4 is respectively connected with pin 1 and pin 2 of the variable resistor RV 2; the pin 3 of the variable resistor RV2 is respectively connected with a pin 2 of an operational amplifier U2 and a pin 1 of the variable resistor RV 1; pin 6 of the operational amplifier U2 is connected with a humidity signal input end Vit; the other end of the resistor R4 is connected with the cathode end of the diode D3, the pin 2 of the variable resistor RV1 and one end of the resistor R1 respectively; the positive end of the diode D3 is connected with the ground wire GND; the other end of the resistor R3 is respectively connected with the pin 3 of the operational amplifier U2, the other end of the inductor L1 and the emitter terminal of the triode Q1; the collector end of the triode Q1 is respectively connected with the other end of the resistor R1 and one end of the humidity sensor RS; and the base end of the triode Q1 is connected with the other end of the humidity sensor RS.
According to one aspect of the invention, the alarm module comprises a resistor R7, a triode Q2, a resistor R8, a triode Q3, a resistor R9, a lamp LED1 and a loudspeaker LS1, wherein one end of the resistor R7 is respectively connected with a collector end of the triode Q1, the other end of the resistor R1 and one end of a humidity sensor RS; the other end of the resistor R7 is connected with the base terminal of a triode Q2; the collector terminal of the triode Q2 is connected with one end of a resistor R8; the emitter terminal of the triode Q2 is connected with the base terminal of the triode Q3; the emitter terminal of the triode Q3 is connected with a ground wire GND; the collector terminal of the triode Q3 is respectively connected with one end of a resistor R9 and one end of a loudspeaker LS 1; the other end of the resistor R9 is connected with the negative electrode end of the lamp LED 1; the positive end of the lamp LED1 is respectively connected with the other end of the loudspeaker LS1, the other end of the power supply +6V, the other end of the resistor R8, the base end of the triode Q1 and the other end of the humidity sensor RS.
According to one aspect of the invention, the signal conversion module comprises a resistor R10, a variable resistor RV3, a capacitor C3, a signal converter U3, a capacitor C4 and a capacitor C2, wherein one end of the capacitor C2 is respectively connected with a power supply +5.5V and a pin 8 of the signal converter U3; the other end of the capacitor C2 is connected with a ground wire GND; pin 4 of the signal converter U3 is connected with one end of a resistor R10; the pin 5 and the pin 2 of the signal converter U3 are respectively connected with the positive terminal of a capacitor C3, the pin 1 of a variable resistor RV3 and the pin 2; the negative end of the capacitor C3 is connected with a ground wire GND; pin 3 of the variable resistor RV3 is connected with the other end of the resistor R10; pin 1 of the signal converter U3 is respectively connected with one end of a capacitor C4 and a ground wire GND; the other end of the capacitor C4 is connected with a pin 6 of a signal converter U3; and pin 7 of the signal converter U3 is connected with a humidity signal output terminal Vin.
According to one aspect of the invention, the timing trigger module comprises a timer U4, a capacitor C5, a capacitor C6, a resistor R12, a resistor R11, a resistor R13, a lamp LED2 and a resistor R14, wherein a pin 3 of the timer U4 is respectively connected with the other end of the capacitor C4 and a pin 6 of a signal converter U3; the pin 7 and the pin 2 of the timer U4 are respectively connected with one end of a resistor R12 and the positive end of a capacitor C6; the pin 6 of the timer U4 is connected with one end of a capacitor C5; the other end of the capacitor C5 is respectively connected with a pin 1 of a timer U4 and a ground wire GND; the pin 5 of the timer U4 is respectively connected with the other end of the resistor R12 and one end of the resistor R11; the pin 4 and the pin 8 of the timer U4 are respectively connected with the other end of the resistor R11 and one end of the resistor R13; the other end of the resistor R13 is connected with the positive end of the lamp LED 2; the negative electrode end of the lamp LED2 is connected with one end of a resistor R14; the negative terminal of the capacitor C6 is connected with the ground GND.
According to one aspect of the invention, the relay control module comprises a triode Q4, a resistor R15, a capacitor C7, a resistor R16, a diode D5 and a relay K1, wherein the base terminal of the triode Q4 is connected with the other end of the resistor R14; the emitter terminal of the triode Q4 is connected with a ground wire GND; the collector terminal of the triode Q4 is connected with one end of a resistor R15; the other end of the resistor R15 is respectively connected with the positive end of a capacitor C7, the negative end of a diode D5, a pin 2 of a relay K1, one end of a resistor R16, the positive end of a diode D5, a pin 1 of a relay K1 and a power supply + 3.3V; and the positive end of the capacitor C7 is connected with the other end of the resistor R16.
According to one aspect of the invention, the capacitor C3, the capacitor C6, the capacitor C7 and the capacitor C9 are all electrolytic capacitors; the diode D1, the diode D2 and the diode D5 are all voltage-stabilizing diodes; the model of the transistor Q1, the model of the transistor Q2, the model of the transistor Q3 and the model of the transistor Q4 are NPN; the controllable voltage stabilizer U1 and the controllable voltage stabilizer U6 are LT 431; the RS model of the humidity sensor is SHT 20; the signal converter U3 is of the type 555; the timer U4 is model NE 555.
According to one aspect of the present invention, a low-voltage control circuit for indoor humidity detection and a temperature drift suppression method thereof are characterized in that a temperature drift suppression unit adjusts a detection data signal fed back by a humidity detection module to suppress a detected humidity parameter from still maintaining transmission stability when a temperature drift phenomenon occurs, and the specific steps are as follows:
Has the advantages that: the invention designs a low-voltage control circuit for indoor humidity detection and a temperature drift suppression method thereof, wherein a humidity sensor can cause a humidity signal to generate a temperature drift phenomenon along with the temperature change of internal components when detecting the humidity generated indoors, so that the temperature drift phenomenon generated by the heating suppression of the internal components is reduced by designing a temperature drift suppression unit at the output end of a humidity detection module and utilizing the parallel connection characteristic of a resistor R23 and a resistor R24, and the transmission of damaged signals is screened through an inductor L1, so that the stability in the transmission of detection signals is improved; when the voltage reduction voltage is provided for the humidity detection module, the output current instability phenomenon of converted alternating current and direct current can be generated, so that when the output current exceeds a set value, the voltage stabilizer U1 is utilized at the voltage acquisition end of the humidity detection module to shunt and degrade the exceeded current, the protection effect on circuit components is achieved, and the output current is kept in a stable state; when the data signal detected by the humidity sensor exceeds a humidity set parameter value, alarm prompt cannot be performed quickly, so that the data signal fed back by the humidity sensor is received by the triode Q2 and the triode Q3 in the alarm module, and when the data signal exceeds the set parameter value, the triode Q2 and the triode Q3 are applied with voltage and are conducted quickly, so that the alarm circuit responds, and the humidity signal is prevented from being transmitted; when the converted electric signal is delayed and responded, redundant frequency bands in the signal cannot be filtered, and the withstand voltage value of the timer U4 cannot be increased, so that a filter circuit is formed by grounding the capacitor C6 at the pin of the timer U4, the resistance R11 and the resistance R12 are connected in series to increase the withstand voltage value of the timer U4, and further the stability of electric signal output and the withstand voltage value of the timer U4 are improved.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a distribution diagram of the indoor detection low-voltage control circuit of the invention.
FIG. 3 is a circuit diagram of a humidity sensing module of the present invention.
Fig. 4 is a circuit diagram of a timing trigger module of the present invention.
Fig. 5 is a circuit diagram of a relay control module of the present invention.
Fig. 6 is a circuit diagram of the temperature drift suppression unit of the present invention.
Detailed Description
As shown in fig. 1, in this embodiment, a low-voltage control circuit for indoor humidity detection includes:
the power supply conversion module is used for providing direct-current voltage for the humidity detection module so that the humidity conversion changes the on-off of the normally open contact SB1 of the relay;
the humidity detection module is used for collecting and sampling indoor humidity and controlling the transmission direction of a detection signal;
the alarm module is used for comparing data collected by the humidity sensor RS, and when the data exceed a humidity parameter value, the triode Q3 is conducted, so that the alarm circuit operates;
the signal conversion module is used for converting the humidity signal fed back by the humidity detection module into an electric signal;
the timing trigger module is used for acquiring the electric signals generated in the signal conversion module so as to control the operation of the timer U4 and further control the output of the output electric signals;
and the relay control module is used for controlling the on-off of the triode Q4 according to an electric signal fed back by the timing trigger module so as to realize the on-off of the relay K1.
In a further embodiment, as shown in fig. 2, a transformer TR1 is adopted in the power conversion module for voltage reduction, and a bridge type voltage stabilizing diode VD1 converts the reduced ac power into dc power, so as to close a normally open contact SB1 of the low-voltage control relay;
when the output maximum current of the controllable voltage stabilizer U1 in the humidity detection module exceeds a set value, the exceeded current is decomposed and stabilized, so that the protection of the circuit is realized;
the audion Q2 and the audion Q3 in the alarm module receive data signals fed back by the humidity sensor, and the audion is conducted when a set parameter value is exceeded, so that an alarm prompt effect is started;
the signal conversion module converts the acquired humidity detection signal into an electric signal to control the operation of the timer U4;
the timing trigger module is grounded by using a capacitor C6 to form a filtering effect, and a resistor R11 and a resistor R12 are connected in series to increase the withstand voltage value of a timer U4;
triode Q4 control relay K1's operation among the relay control module, and then adsorb relay normally open contact SB 1's closure, and then realize low pressure control high voltage equipment's operation.
In a further embodiment, as shown in fig. 6, the temperature drift suppression unit includes a resistor R17, a diode D6, a resistor R18, a resistor R20, a resistor R21, an operational amplifier U5, a capacitor C8, a resistor R22, a controllable regulator U6, a capacitor C10, a capacitor C11, a capacitor C9, a resistor R23, a resistor R24, a resistor R25, and a capacitor C12.
In a further embodiment, one end of the resistor R17 in the temperature drift suppression unit is connected to a humidity signal input end Vit; the other end of the resistor R17 is respectively connected with the positive end of a diode D6 and one end of a resistor R18; the other end of the resistor R18 is respectively connected with one end of a resistor R21 and one end of a resistor R20; the other end of the resistor R20 is respectively connected with the cathode end of the diode D6 and the ground wire GND; the other end of the resistor R21 is respectively connected with a pin 3 of an operational amplifier U5 and one end of a capacitor C8; the other end of the capacitor C8 is respectively connected with a pin 6 of an operational amplifier U5, one end of a resistor R22 and a pin 2 of a controllable voltage stabilizer U6; the other end of the resistor R22 is connected with a pin 2 of an operational amplifier U5; pin 7 of the operational amplifier U5 is connected with +5.5V of a power supply; the pin 4 of the operational amplifier U5 is connected with a power supply of-5.5V; the pin 1 of the controllable voltage stabilizer U6 is respectively connected with the positive terminal of a capacitor C9, one end of a resistor R23 and one end of a resistor R24; the pin 3 of the controllable voltage stabilizer U6 is respectively connected with one end of a capacitor C11, the positive end of a capacitor C10 and a power supply + 5V; the negative end of the capacitor C10 is respectively connected with the other end of the capacitor C11 and a ground wire GND; the negative end of the capacitor C9 is connected with a ground wire GND; the other end of the resistor R23 is respectively connected with the other end of the resistor R24, one end of the resistor R25 and the humidity signal output end Vin; the other end of the resistor R25 is connected with one end of a capacitor C12; the other end of the capacitor C12 is connected with the ground line GND.
In a further embodiment, the power conversion module includes fuse FU1, fuse FU2, transformer TR1, diode D1, normally open relay contact SB1, diode D2, capacitor C1, and zener diode VD 1.
In a further embodiment, one end of the fuse FU1 in the power conversion module is connected to the positive terminal of the alternating current AC 220V; the other end of the fuse FU1 is connected with a pin 2 of a transformer TR1 and the positive end of a diode D1 respectively; the negative end of the diode D1 is connected with one end of a normally open contact SB1 of the relay; the other end of the normally open contact SB1 of the relay is connected with the output end of the alternating current AC 220V; one end of the fuse FU2 is connected with the negative electrode end of the alternating current AC 220V; the other end of the fuse FU2 is connected with a pin 1 of a transformer TR1 and the positive end of a diode D2; the negative terminal of the diode D2 is connected with the output terminal of the alternating current AC 220V; pin 3 of the transformer TR1 is connected with pin 1 of a bridge type voltage stabilizing diode VD 1; pin 4 of the transformer TR1 is connected with pin 2 of a bridge type voltage stabilizing diode VD 1; the pin 3 of the bridge type voltage stabilizing diode VD1 is connected with one end of a capacitor C1; and the pin 4 of the bridge type voltage stabilizing diode VD1 is connected with the other end of the capacitor C1.
In a further embodiment, as shown in fig. 3, the humidity detection module includes a controllable regulator U1, a resistor R5, a resistor R6, a diode D4, a variable resistor RV2, an operational amplifier U2, a resistor R3, a resistor R4, a diode D3, a resistor R2, a variable resistor RV1, an inductor L1, a transistor Q1, a resistor R1, and a humidity sensor RS.
In a further embodiment, in the humidity detection module, the pin 2 of the controllable voltage regulator U1 is respectively connected to one end of a resistor R6, the positive end of a diode D4, the pin 7 of an operational amplifier U2, one end of a resistor R3, one end of a resistor R2, one end of an inductor L1, the pin 4 of a bridge type voltage regulator diode VD1, and the other end of a capacitor C1; the pin 3 of the controllable voltage stabilizer U1 is respectively connected with one end of a resistor R5, one end of a resistor R4, a pin 4 of an operational amplifier U2, a pin 3 of a bridge type voltage stabilizing diode VD1 and one end of a capacitor C1; the pin 1 of the controllable voltage stabilizer U1 is respectively connected with the other end of the resistor R6 and the other end of the resistor R5; the negative end of the diode D4 is respectively connected with pin 1 and pin 2 of the variable resistor RV 2; the pin 3 of the variable resistor RV2 is respectively connected with a pin 2 of an operational amplifier U2 and a pin 1 of the variable resistor RV 1; pin 6 of the operational amplifier U2 is connected with a humidity signal input end Vit; the other end of the resistor R4 is connected with the cathode end of the diode D3, the pin 2 of the variable resistor RV1 and one end of the resistor R1 respectively; the positive end of the diode D3 is connected with the ground wire GND; the other end of the resistor R3 is respectively connected with the pin 3 of the operational amplifier U2, the other end of the inductor L1 and the emitter terminal of the triode Q1; the collector end of the triode Q1 is respectively connected with the other end of the resistor R1 and one end of the humidity sensor RS; and the base end of the triode Q1 is connected with the other end of the humidity sensor RS.
In a further embodiment, the alarm module comprises a resistor R7, a transistor Q2, a resistor R8, a transistor Q3, a resistor R9, a lamp LED1 and a speaker LS 1.
In a further embodiment, one end of the resistor R7 in the alarm module is respectively connected to the collector terminal of the triode Q1, the other end of the resistor R1, and one end of the humidity sensor RS; the other end of the resistor R7 is connected with the base terminal of a triode Q2; the collector terminal of the triode Q2 is connected with one end of a resistor R8; the emitter terminal of the triode Q2 is connected with the base terminal of the triode Q3; the emitter terminal of the triode Q3 is connected with a ground wire GND; the collector terminal of the triode Q3 is respectively connected with one end of a resistor R9 and one end of a loudspeaker LS 1; the other end of the resistor R9 is connected with the negative electrode end of the lamp LED 1; the positive end of the lamp LED1 is respectively connected with the other end of the loudspeaker LS1, the other end of the power supply +6V, the other end of the resistor R8, the base end of the triode Q1 and the other end of the humidity sensor RS.
In a further embodiment, the signal conversion module includes a resistor R10, a variable resistor RV3, a capacitor C3, a signal converter U3, a capacitor C4, and a capacitor C2.
In a further embodiment, one end of the capacitor C2 in the signal conversion module is connected to +5.5V of the power supply and pin 8 of the signal converter U3, respectively; the other end of the capacitor C2 is connected with a ground wire GND; pin 4 of the signal converter U3 is connected with one end of a resistor R10; the pin 5 and the pin 2 of the signal converter U3 are respectively connected with the positive terminal of a capacitor C3, the pin 1 of a variable resistor RV3 and the pin 2; the negative end of the capacitor C3 is connected with a ground wire GND; pin 3 of the variable resistor RV3 is connected with the other end of the resistor R10; pin 1 of the signal converter U3 is respectively connected with one end of a capacitor C4 and a ground wire GND; the other end of the capacitor C4 is connected with a pin 6 of a signal converter U3; and pin 7 of the signal converter U3 is connected with a humidity signal output terminal Vin.
In a further embodiment, as shown in fig. 4, the timing trigger module includes a timer U4, a capacitor C5, a capacitor C6, a resistor R12, a resistor R11, a resistor R13, a lamp LED2, and a resistor R14.
In a further embodiment, the timer U4 pin 3 in the timing trigger module is connected to the other end of the capacitor C4 and the signal converter U3 pin 6, respectively; the pin 7 and the pin 2 of the timer U4 are respectively connected with one end of a resistor R12 and the positive end of a capacitor C6; the pin 6 of the timer U4 is connected with one end of a capacitor C5; the other end of the capacitor C5 is respectively connected with a pin 1 of a timer U4 and a ground wire GND; the pin 5 of the timer U4 is respectively connected with the other end of the resistor R12 and one end of the resistor R11; the pin 4 and the pin 8 of the timer U4 are respectively connected with the other end of the resistor R11 and one end of the resistor R13; the other end of the resistor R13 is connected with the positive end of the lamp LED 2; the negative electrode end of the lamp LED2 is connected with one end of a resistor R14; the negative terminal of the capacitor C6 is connected with the ground GND.
In a further embodiment, as shown in fig. 5, the relay control module includes a transistor Q4, a resistor R15, a capacitor C7, a resistor R16, a diode D5, and a relay K1.
In a further embodiment, the base terminal of the transistor Q4 in the relay control module is connected to the other terminal of the resistor R14; the emitter terminal of the triode Q4 is connected with a ground wire GND; the collector terminal of the triode Q4 is connected with one end of a resistor R15; the other end of the resistor R15 is respectively connected with the positive end of a capacitor C7, the negative end of a diode D5, a pin 2 of a relay K1, one end of a resistor R16, the positive end of a diode D5, a pin 1 of a relay K1 and a power supply + 3.3V; and the positive end of the capacitor C7 is connected with the other end of the resistor R16.
In a further embodiment, the capacitor C3, the capacitor C6, the capacitor C7 and the capacitor C9 are all electrolytic capacitors; the diode D1, the diode D2 and the diode D5 are all voltage-stabilizing diodes; the model of the transistor Q1, the model of the transistor Q2, the model of the transistor Q3 and the model of the transistor Q4 are NPN; the controllable voltage stabilizer U1 and the controllable voltage stabilizer U6 are LT 431; the RS model of the humidity sensor is SHT 20; the signal converter U3 is of the type 555; the timer U4 is model NE 555.
In a further embodiment, a low-voltage control circuit for indoor humidity detection and a temperature drift suppression method thereof are characterized in that a temperature drift suppression unit adjusts a detection data signal fed back by a humidity detection module to suppress a detected humidity parameter from still keeping transmission stability when a temperature drift phenomenon occurs, and the specific steps are as follows:
In summary, the present invention has the following advantages: the fuse FU1 and the fuse FU2 are connected to a line of an input alternating current and used for protecting external equipment when high current is generated, the diode D1 and the diode D2 stabilize output voltage, the transformer TR1 reduces the obtained high voltage, the bridge type voltage stabilizing diode VD1 converts the reduced alternating current into direct current, and therefore the on-off of a normally open contact SB1 of the low-voltage control relay is realized, the capacitor C1 stores the obtained direct current, and the phenomenon of insufficient current in the line is prevented; when the maximum output current of the controllable voltage stabilizer U1 exceeds a set value, the exceeded current is decomposed and stabilized, so that the circuit is protected, the resistor R6 and the resistor R7 adjust different output voltage values according to different output branches of the controllable voltage stabilizer U1, the variable resistor RV2 is used for meeting the voltage requirements of components, the inductor L1 screens the transmission of damaged signals, and the stable output voltage is controlled by the triode Q1 to provide operating voltage for the humidity sensor RS; the triode Q2 and the triode Q3 receive data signals fed back by the humidity sensor, and the triode is conducted when the set parameter values are exceeded, so that the alarm prompting effect is started; the capacitor C2 filters impurity frequency bands in an input power supply, the resistor R10 and the resistor RV3 form a resistance value adjusting circuit to meet different conversion efficiencies, the capacitor C3 filters redundant impurity frequency bands generated in the conversion of the converter U3, the capacitor C4 provides storage electric energy for electric signal transmission, and stability in transmission is kept, so that the signal conversion module converts the acquired humidity detection signal into an electric signal to control the operation of the timer U4; the capacitor C6 is grounded to form a filter circuit to eliminate interference signals received by the timer U4, and the resistor R11 and the resistor R12 are connected in series to increase the voltage withstanding value of the timer U4; and resistance R16 absorbs the electric energy of electric capacity C7, prevents that electric capacity C7 discharge current is too big, influences the operation of parallel devices, and triode Q4 control relay K1's operation, and then adsorbs the closure of relay normally open contact SB1, and then realizes the operation of low pressure control high-tension apparatus.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (10)
1. A low-voltage control circuit for indoor humidity detection is characterized by comprising the following modules:
the power supply conversion module is used for providing direct-current voltage for the humidity detection module so that the humidity conversion changes the on-off of the normally open contact SB1 of the relay;
the humidity detection module is used for collecting and sampling indoor humidity and controlling the transmission direction of a detection signal;
the alarm module is used for comparing data collected by the humidity sensor RS, and when the data exceed a humidity parameter value, the triode Q3 is conducted, so that the alarm circuit operates;
the signal conversion module is used for converting the humidity signal fed back by the humidity detection module into an electric signal;
the timing trigger module is used for acquiring the electric signals generated in the signal conversion module so as to control the operation of the timer U4 and further control the output of the output electric signals;
and the relay control module is used for controlling the on-off of the triode Q4 according to an electric signal fed back by the timing trigger module so as to realize the on-off of the relay K1.
2. The low-voltage control circuit for indoor humidity detection according to claim 1, wherein a transformer TR1 is adopted in the power conversion module for voltage reduction, and a bridge type voltage stabilizing diode VD1 converts the reduced AC power into DC power, so that a normally open contact SB1 of the low-voltage control relay is closed;
when the output maximum current of the controllable voltage stabilizer U1 in the humidity detection module exceeds a set value, the exceeded current is decomposed and stabilized, so that the protection of the circuit is realized;
the audion Q2 and the audion Q3 in the alarm module receive data signals fed back by the humidity sensor, and the audion is conducted when a set parameter value is exceeded, so that an alarm prompt effect is started;
the signal conversion module converts the acquired humidity detection signal into an electric signal to control the operation of the timer U4;
the timing trigger module is grounded by using a capacitor C6 to form a filtering effect, and a resistor R11 and a resistor R12 are connected in series to increase the withstand voltage value of a timer U4;
triode Q4 control relay K1's operation among the relay control module, and then adsorb relay normally open contact SB 1's closure, and then realize low pressure control high voltage equipment's operation.
3. The low-voltage control circuit for indoor humidity detection according to claim 1, wherein the humidity detection module comprises: a temperature drift suppression unit; the temperature drift suppression unit comprises a resistor R17, a diode D6, a resistor R18, a resistor R20, a resistor R21, an operational amplifier U5, a capacitor C8, a resistor R22, a controllable voltage stabilizer U6, a capacitor C10, a capacitor C11, a capacitor C9, a resistor R23, a resistor R24, a resistor R25 and a capacitor C12, wherein one end of the resistor R17 is connected with a humidity signal input end Vit; the other end of the resistor R17 is respectively connected with the positive end of a diode D6 and one end of a resistor R18; the other end of the resistor R18 is respectively connected with one end of a resistor R21 and one end of a resistor R20; the other end of the resistor R20 is respectively connected with the cathode end of the diode D6 and the ground wire GND; the other end of the resistor R21 is respectively connected with a pin 3 of an operational amplifier U5 and one end of a capacitor C8; the other end of the capacitor C8 is respectively connected with a pin 6 of an operational amplifier U5, one end of a resistor R22 and a pin 2 of a controllable voltage stabilizer U6; the other end of the resistor R22 is connected with a pin 2 of an operational amplifier U5; pin 7 of the operational amplifier U5 is connected with +5.5V of a power supply; the pin 4 of the operational amplifier U5 is connected with a power supply of-5.5V; the pin 1 of the controllable voltage stabilizer U6 is respectively connected with the positive terminal of a capacitor C9, one end of a resistor R23 and one end of a resistor R24; the pin 3 of the controllable voltage stabilizer U6 is respectively connected with one end of a capacitor C11, the positive end of a capacitor C10 and a power supply + 5V; the negative end of the capacitor C10 is respectively connected with the other end of the capacitor C11 and a ground wire GND; the negative end of the capacitor C9 is connected with a ground wire GND; the other end of the resistor R23 is respectively connected with the other end of the resistor R24, one end of the resistor R25 and the humidity signal output end Vin; the other end of the resistor R25 is connected with one end of a capacitor C12; the other end of the capacitor C12 is connected with the ground line GND.
4. The low-voltage control circuit for indoor humidity detection according to claim 1, wherein the power conversion module comprises a fuse FU1, a fuse FU2, a transformer TR1, a diode D1, a normally open relay SB1, a diode D2, a capacitor C1, and a voltage stabilizing diode VD1, wherein one end of the fuse FU1 is connected with the positive terminal of an alternating current AC 220V; the other end of the fuse FU1 is connected with a pin 2 of a transformer TR1 and the positive end of a diode D1 respectively; the negative end of the diode D1 is connected with one end of a normally open contact SB1 of the relay; the other end of the normally open contact SB1 of the relay is connected with the output end of the alternating current AC 220V; one end of the fuse FU2 is connected with the negative electrode end of the alternating current AC 220V; the other end of the fuse FU2 is connected with a pin 1 of a transformer TR1 and the positive end of a diode D2; the negative terminal of the diode D2 is connected with the output terminal of the alternating current AC 220V; pin 3 of the transformer TR1 is connected with pin 1 of a bridge type voltage stabilizing diode VD 1; pin 4 of the transformer TR1 is connected with pin 2 of a bridge type voltage stabilizing diode VD 1; the pin 3 of the bridge type voltage stabilizing diode VD1 is connected with one end of a capacitor C1; and the pin 4 of the bridge type voltage stabilizing diode VD1 is connected with the other end of the capacitor C1.
5. The low-voltage control circuit for indoor humidity detection according to claim 1, wherein the humidity detection module comprises a controllable voltage regulator U1, a resistor R5, a resistor R6, a diode D4, a variable resistor RV2, an operational amplifier U2, a resistor R3, a resistor R4, a diode D3, a resistor R2, a variable resistor RV1, an inductor L1, a transistor Q1, a resistor R1, and a humidity sensor RS, wherein a pin 2 of the controllable voltage regulator U1 is connected to one end of the resistor R6, an anode end of the diode D4, a pin 7 of the operational amplifier U2, one end of the resistor R3, one end of the resistor R2, one end of the inductor L1, a pin 4 of a zener diode VD1, and the other end of a capacitor C1, respectively; the pin 3 of the controllable voltage stabilizer U1 is respectively connected with one end of a resistor R5, one end of a resistor R4, a pin 4 of an operational amplifier U2, a pin 3 of a bridge type voltage stabilizing diode VD1 and one end of a capacitor C1; the pin 1 of the controllable voltage stabilizer U1 is respectively connected with the other end of the resistor R6 and the other end of the resistor R5; the negative end of the diode D4 is respectively connected with pin 1 and pin 2 of the variable resistor RV 2; the pin 3 of the variable resistor RV2 is respectively connected with a pin 2 of an operational amplifier U2 and a pin 1 of the variable resistor RV 1; pin 6 of the operational amplifier U2 is connected with a humidity signal input end Vit; the other end of the resistor R4 is connected with the cathode end of the diode D3, the pin 2 of the variable resistor RV1 and one end of the resistor R1 respectively; the positive end of the diode D3 is connected with the ground wire GND; the other end of the resistor R3 is respectively connected with the pin 3 of the operational amplifier U2, the other end of the inductor L1 and the emitter terminal of the triode Q1; the collector end of the triode Q1 is respectively connected with the other end of the resistor R1 and one end of the humidity sensor RS; and the base end of the triode Q1 is connected with the other end of the humidity sensor RS.
6. The low-voltage control circuit for detecting indoor humidity according to claim 1, wherein the alarm module comprises a resistor R7, a transistor Q2, a resistor R8, a transistor Q3, a resistor R9, a lamp LED1 and a speaker LS1, wherein one end of the resistor R7 is connected with a collector terminal of the transistor Q1, the other end of the resistor R1 and one end of a humidity sensor RS respectively; the other end of the resistor R7 is connected with the base terminal of a triode Q2; the collector terminal of the triode Q2 is connected with one end of a resistor R8; the emitter terminal of the triode Q2 is connected with the base terminal of the triode Q3; the emitter terminal of the triode Q3 is connected with a ground wire GND; the collector terminal of the triode Q3 is respectively connected with one end of a resistor R9 and one end of a loudspeaker LS 1; the other end of the resistor R9 is connected with the negative electrode end of the lamp LED 1; the positive end of the lamp LED1 is respectively connected with the other end of the loudspeaker LS1, the other end of the power supply +6V, the other end of the resistor R8, the base end of the triode Q1 and the other end of the humidity sensor RS.
7. The low-voltage control circuit for detecting indoor humidity according to claim 1, wherein the signal conversion module comprises a resistor R10, a variable resistor RV3, a capacitor C3, a signal converter U3, a capacitor C4 and a capacitor C2, wherein one end of the capacitor C2 is connected to +5.5V of a power supply and a pin 8 of the signal converter U3, respectively; the other end of the capacitor C2 is connected with a ground wire GND; pin 4 of the signal converter U3 is connected with one end of a resistor R10; the pin 5 and the pin 2 of the signal converter U3 are respectively connected with the positive terminal of a capacitor C3, the pin 1 of a variable resistor RV3 and the pin 2; the negative end of the capacitor C3 is connected with a ground wire GND; pin 3 of the variable resistor RV3 is connected with the other end of the resistor R10; pin 1 of the signal converter U3 is respectively connected with one end of a capacitor C4 and a ground wire GND; the other end of the capacitor C4 is connected with a pin 6 of a signal converter U3; and pin 7 of the signal converter U3 is connected with a humidity signal output terminal Vin.
8. The low-voltage control circuit for indoor humidity detection according to claim 1, wherein the timing trigger module comprises a timer U4, a capacitor C5, a capacitor C6, a resistor R12, a resistor R11, a resistor R13, a lamp LED2 and a resistor R14, wherein a pin 3 of the timer U4 is respectively connected with the other end of the capacitor C4 and a pin 6 of a signal converter U3; the pin 7 and the pin 2 of the timer U4 are respectively connected with one end of a resistor R12 and the positive end of a capacitor C6; the pin 6 of the timer U4 is connected with one end of a capacitor C5; the other end of the capacitor C5 is respectively connected with a pin 1 of a timer U4 and a ground wire GND; the pin 5 of the timer U4 is respectively connected with the other end of the resistor R12 and one end of the resistor R11; the pin 4 and the pin 8 of the timer U4 are respectively connected with the other end of the resistor R11 and one end of the resistor R13; the other end of the resistor R13 is connected with the positive end of the lamp LED 2; the negative electrode end of the lamp LED2 is connected with one end of a resistor R14; the negative terminal of the capacitor C6 is connected with the ground GND.
9. The low-voltage control circuit for indoor humidity detection according to claim 1, wherein the relay control module comprises a transistor Q4, a resistor R15, a capacitor C7, a resistor R16, a diode D5, and a relay K1, wherein a base terminal of the transistor Q4 is connected to the other terminal of the resistor R14; the emitter terminal of the triode Q4 is connected with a ground wire GND; the collector terminal of the triode Q4 is connected with one end of a resistor R15; the other end of the resistor R15 is respectively connected with the positive end of a capacitor C7, the negative end of a diode D5, a pin 2 of a relay K1, one end of a resistor R16, the positive end of a diode D5, a pin 1 of a relay K1 and a power supply + 3.3V; and the positive end of the capacitor C7 is connected with the other end of the resistor R16.
10. The low-voltage control circuit for indoor humidity detection and the temperature drift suppression method thereof according to claim 3, wherein the temperature drift suppression unit adjusts the detected data signal fed back by the humidity detection module to suppress the detected humidity parameter from still maintaining transmission stability when the temperature drift phenomenon occurs, and the specific steps are as follows:
step 1, one end of a resistor R17 acquires a detection signal fed back by an operational amplifier U2 through a humidity signal input end Vit, a diode D6 limits the unidirectional flow of the detection signal and prevents the directional conduction of a damaged signal, the resistor R18 and the resistor R21 select different conduction paths according to different resistance values in signal transmission, further, the transmission of redundant signals is eliminated through grounding of one end of a resistor R20, the resistor R21 reduces the running voltage value provided by the operational amplifier U5, a capacitor C8 stores +5.5V of a power supply released from the operational amplifier U5, further, the stability of transmission voltage during operation is maintained, the operational speed of the operational amplifier U5 is improved, the resistor R22 provides voltage for the operational amplifier U5 to reduce the voltage, and the controllable voltage stabilizer U6 realizes a signal conduction end;
step 2, the controllable voltage stabilizer U6 can change the output voltage value according to the input power supply 5V, and further meet the requirement of the required output voltage value, and further the controllable voltage stabilizer U6 has the circuit protection function, when the output current value is larger than the set output value, the protection can be achieved, so as to prevent the conduction higher than the output current, the capacitor C10 and the capacitor C11 are connected in parallel to increase the total capacity value, so as to improve the parameter value of the withstand voltage value, so that the operation components work in the stable voltage value, the negative end of the capacitor C9 is grounded to filter the unstable voltage applied to the operation components, the resistor R23 and the resistor R24 are connected in parallel to the signal transmission path, so as to reduce the transmission of the output detection signal influenced by the temperature change, thereby inhibiting the temperature drift phenomenon of the components, the resistor R25 and the capacitor C12 are connected in series to filter the high-frequency signal generated in the signal transmission, so as to, and the accuracy of signal transmission is improved by adjusting the operation signal and the input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010393773.6A CN111624304A (en) | 2020-05-11 | 2020-05-11 | Low-voltage control circuit for indoor humidity detection and temperature drift suppression method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010393773.6A CN111624304A (en) | 2020-05-11 | 2020-05-11 | Low-voltage control circuit for indoor humidity detection and temperature drift suppression method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111624304A true CN111624304A (en) | 2020-09-04 |
Family
ID=72270939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010393773.6A Withdrawn CN111624304A (en) | 2020-05-11 | 2020-05-11 | Low-voltage control circuit for indoor humidity detection and temperature drift suppression method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111624304A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112214042A (en) * | 2020-09-14 | 2021-01-12 | 南京骞翮物联网科技有限公司 | Sewage discharge control system based on Internet of things and control method thereof |
-
2020
- 2020-05-11 CN CN202010393773.6A patent/CN111624304A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112214042A (en) * | 2020-09-14 | 2021-01-12 | 南京骞翮物联网科技有限公司 | Sewage discharge control system based on Internet of things and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8779679B2 (en) | LED lamp, illumination device including the LED lamp and current control method of the LED lamp | |
| WO2005033819A3 (en) | Bridge-less boost (blb) power factor correction topology controlled with one cycle control | |
| CN107529249B (en) | Intelligent high-power LED fish attracting lamp control system and control method thereof | |
| CN104113967A (en) | LED driving device | |
| CN204090258U (en) | Intelligent LED underwater fishing lamp | |
| CN111624304A (en) | Low-voltage control circuit for indoor humidity detection and temperature drift suppression method thereof | |
| CN114340077A (en) | LED dimming circuit, dimming LED lamp and LED dimming method based on LED dimming circuit | |
| CN111463874A (en) | Overload protection circuit and overload control method for AC/DC conversion charger of new energy automobile | |
| CN107154737A (en) | A kind of special DC DC12V20A converters of electric car | |
| CN217904711U (en) | Intelligent street lamp controller | |
| CN207037517U (en) | A kind of power supply of lampblack absorber cleaning equipment | |
| CN211018675U (en) | Flyback AC-DC constant current power supply box | |
| CN107154735A (en) | A kind of special DC DC12V10A converters of electric car | |
| CN107579560A (en) | A kind of accumulator charging and discharging state detection and monitoring system | |
| CN209088834U (en) | Switching power circuit and Switching Power Supply | |
| CN111371147A (en) | New energy automobile DC charger output regulation and control circuit and power protection control method | |
| CN208752487U (en) | A kind of constant-current circuit of dust catcher | |
| CN208112507U (en) | A kind of dedicated DC-DC12V25A converter of electric vehicle with the normal output function of 12V | |
| CN207098940U (en) | A kind of special DC DC12V10A converters of electric car | |
| CN111464054A (en) | Direct current switch power supply | |
| CN220022620U (en) | Intrinsic safety explosion-proof power supply system with energy storage performance | |
| CN220137595U (en) | Low-voltage-stabilizing controller | |
| CN205039708U (en) | Developments capacitor discharge ware based on adjustable D.C. regulated power supply | |
| CN205051579U (en) | Intelligence photovoltaic frequency control ware | |
| CN220570459U (en) | Power supply surge protection circuit and switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200904 |
|
| WW01 | Invention patent application withdrawn after publication |