CN218413314U - Half-wave detection circuit with stable reference voltage - Google Patents
Half-wave detection circuit with stable reference voltage Download PDFInfo
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- CN218413314U CN218413314U CN202222182345.6U CN202222182345U CN218413314U CN 218413314 U CN218413314 U CN 218413314U CN 202222182345 U CN202222182345 U CN 202222182345U CN 218413314 U CN218413314 U CN 218413314U
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Abstract
The utility model discloses a half-wave detection circuitry who possesses stable reference voltage, including power supply circuit, light source drive circuit, master control circuit, ADC reference circuit and signal processing circuit, power supply circuit's input is connected with the external power supply electricity, power supply circuit's first output with light source drive circuit electricity is connected, power supply circuit's second output with master control circuit electricity is connected, power supply circuit's third output respectively with ADC reference circuit and signal processing circuit electricity are connected, carry out half-wave amplification and filtering to the original signal of sensor output through signal processing circuit, handle and carry to master control circuit after accomplishing, export after will handling signal and reference voltage signal and calculate through master control circuit. The utility model provides a half-wave detection circuitry who possesses stable reference voltage has the improvement and detects accuracy nature to reduce measuring error's effect.
Description
Technical Field
The utility model relates to a gaseous detection technology field especially relates to a half-wave detection circuitry who possesses stable reference voltage.
Background
The commonly used gas detectors include catalytic combustion type, semiconductor gas sensitive type, infrared spectrum type, gas chromatography type, optical fiber measurement type and the like, and different principles respectively have advantages and disadvantages, wherein a gas detection system based on the infrared spectrum method has the advantages of high response speed, good selectivity, low possibility of poisoning, no need of frequent adjustment and the like, and can replace other gas detection systems in many fields. The scheme provides a detection circuit through a half-wave detection method, so that the operational amplifier is fully utilized, stable reference voltage is provided for comparison, the output and collected data are more accurate, and the measurement precision is improved.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, there is provided a half-wave detection circuit having a stable reference voltage, which has an effect of improving data accuracy to reduce measurement errors.
The specific technical scheme is as follows:
the utility model provides a half-wave detection circuitry who has stable reference voltage, includes power supply circuit, light source drive circuit, master control circuit, ADC reference circuit and signal processing circuit, power supply circuit's input is connected with external power electricity, power supply circuit's first output with light source drive circuit electricity is connected, power supply circuit's second output with master control circuit electricity is connected, power supply circuit's third output respectively with ADC reference circuit and signal processing circuit electricity are connected, master control circuit's signal output part with light source drive circuit's signal input part electricity is connected, light source drive circuit output light signal, sensor receiving light signal and convert the electric signal output to signal processing circuit, signal processing circuit's signal output part with master control circuit's detection signal input part electricity is connected, ADC reference circuit with master control circuit's contrast signal input part electricity is connected.
The half-wave detection circuit with the stable reference voltage also has the characteristic that the main controller adopts a main control chip with the model number of HC32F072 JATA.
The beneficial effect of above-mentioned scheme: the main control chip collects the processed signals of the signal processing circuit by using an ADC (analog to digital converter) of the main control chip, performs filtering processing on the collected voltage data, and performs data transmission on the result through a serial port for TTL (transistor-transistor logic) level.
The half-wave detection circuit with the stable reference voltage is characterized in that the power supply circuit comprises a light source driving power supply circuit, a main control chip power supply circuit and an operational amplifier power supply circuit, the input ends of the light source driving power supply circuit, the main control chip power supply circuit and the operational amplifier power supply circuit are electrically connected with an external power supply, the output end of the light source driving power supply circuit serves as a first power supply output end and is electrically connected with the power supply input end of the light source driving circuit, the output end of the main control chip power supply circuit serves as a second power supply output end and is electrically connected with the power supply input end of the main control circuit, and the output end of the operational amplifier power supply circuit serves as a third power supply output end and is respectively electrically connected with the ADC reference circuit and the signal processing circuit.
The beneficial effect of above-mentioned scheme: the external power supply can input 8-15V direct current voltage, the light source driving power supply circuit converts the external power supply into 5V direct current voltage to supply power for the light source driving circuit, the main control chip power supply circuit converts the external power supply into 3.3V voltage to supply power for the main control circuit, the operational amplifier power supply circuit converts the external power supply into 3.3V voltage, the signal processing circuit and the ADC reference circuit are supplied with power respectively, three paths of power supply circuits are mutually independent, power is supplied for each circuit independently, stability of each circuit is ensured, and mutual interference among the circuits is avoided during work.
The half-wave detection circuit with the stable reference voltage is characterized in that the light source driving circuit comprises a black body light source D3, a resistor R8, an MOS (metal oxide semiconductor) tube Q1 and a resistor R9, the output end of the light source driving power supply circuit is electrically connected with the input end of the black body light source D3, the output end of the black body light source D3 is electrically connected with the drain electrode of the MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with the signal output end of the main control circuit through the resistor R8, the source electrode of the MOS tube Q1 is grounded, one end of the resistor R9 is electrically connected with the grid electrode of the MOS tube Q1, and the other end of the resistor R9 is electrically connected with the source electrode of the MOS tube Q1.
The beneficial effect of above-mentioned scheme: the light source driving circuit generates infrared modulation waves with specific frequency to act on the sensor, the sensor outputs sine waves with the same frequency as the modulation light after receiving the modulation light, and the concentration of different gases is determined by measuring the amplitude of the sine waves.
The half-wave detection circuit with the stable reference voltage is further characterized in that the signal processing circuit comprises an operational amplifier U10, a resistor R26, a capacitor C38, a resistor R29, a resistor R24, a capacitor C34, a capacitor C39, a resistor R22, a resistor R18, a capacitor C34, a resistor R13, a capacitor C32, a capacitor C37, a capacitor C35, a resistor R14, a capacitor C33, a capacitor C36, a resistor R19, a resistor R25, a capacitor C41, a resistor R28, a resistor R23, a capacitor C40 and a resistor R27, a power input end of the operational amplifier U10 is electrically connected with an output end of the operational amplifier power supply circuit, and the capacitor C37 and the capacitor C35 are connected in parallel between the power input end of the operational amplifier U10 and the ground;
a first positive signal input end of the operational amplifier U10 is electrically connected to a signal output end of the sensor through the resistor R24 and the capacitor C38 in sequence, a signal output end of the sensor is also grounded through the resistor R26, a common end of the capacitor C38 and the resistor R24 is electrically connected to an external reference voltage source through the resistor R29, a first positive signal input end of the operational amplifier U10 is grounded through the capacitor C39, a first negative signal input end of the operational amplifier U10 is electrically connected to the external reference voltage source through the resistor R22, the resistor R18 and the capacitor C34 are connected in parallel between the first negative signal input end of the operational amplifier U10 and the first signal output end of the operational amplifier U10, the resistor R13 and the capacitor C32 are connected in series between the first signal output end of the operational amplifier U10 and the ground in sequence, and a common end of the resistor R13 and the capacitor C32 is electrically connected to a detection signal input end of the main control circuit;
a second positive signal input end of the operational amplifier U10 is sequentially grounded through the resistor R25, the capacitor C40 and the resistor R27, a common end of the capacitor C40 and the resistor R27 is electrically connected with another signal output end of the sensor, a second positive signal input end of the operational amplifier U10 is grounded through the capacitor C41, a common end of the resistor R25 and the capacitor C40 is electrically connected with an external reference voltage source through the resistor R28, a second negative signal input end of the operational amplifier U10 is electrically connected with an external reference voltage source through the resistor R23, the resistor R19 and the capacitor C36 are connected in parallel between the second negative signal input end of the operational amplifier U10 and the second signal output end of the operational amplifier U10, the second signal output end of the operational amplifier U10 is grounded through the resistor R14 and the capacitor C33, and a common end of the resistor R14 and the capacitor C33 is electrically connected with another detection signal input end of the main control circuit.
The beneficial effect of above-mentioned scheme: two paths of original SIGNALs output by the sensor are respectively REF _ NET and SIGNAL, and are respectively input by two paths of input ends of the operational amplifier U10, and the operational amplifier U10 amplifies and filters the two paths of original SIGNALs and outputs the two paths of original SIGNALs to the main control circuit.
The half-wave detection circuit with the stable reference voltage further has the characteristics that the ADC reference circuit comprises a resistor R20, a resistor R17, a resistor R16, a resistor R12, an operational amplifier U9, a resistor R15, a resistor R21 and a voltage stabilizer U8, the output end of the operational amplifier power supply circuit is electrically connected with the positive signal input end of the operational amplifier U9 through the resistor R20, the negative signal input end of the operational amplifier U9 is grounded through the resistor R17, the negative signal input end of the operational amplifier U9 is also electrically connected with the signal output end of the operational amplifier U9 through the resistor R16, the signal output end of the operational amplifier U9 is electrically connected with the comparison signal input end of the main control circuit through the resistor R12, the signal output end of the operational amplifier U9 is also electrically connected with the positive signal input end of the operational amplifier U9 through the resistor R12, the resistor R15 and the resistor R21 are sequentially connected in series between the positive signal input end of the operational amplifier U9 and the ground, the common terminal of the resistor R15 and the resistor R21 are electrically connected with the reference pole of the U8, and the positive electrode of the voltage stabilizer U8 are electrically connected with the positive signal input end of the anode of the voltage stabilizer U9, and the anode of the operational amplifier U8 are electrically connected.
The beneficial effect of above-mentioned scheme: the voltage regulator U8 adopts a TL431 voltage reference chip, and a reference voltage can be obtained through a simple circuit, but if a supply voltage of the voltage regulator U changes, a current of the TL431 also changes, so that the reference voltage also floats in a small range. A voltage reference circuit serving as ADC reference is built together by using the operational amplifier U9 and the TL431, and the circuit has the advantages of being high in anti-interference capability, low in cost, stable in output and the like.
In conclusion, the scheme has the beneficial effects that:
the utility model provides an among the half-wave detection circuitry who possesses stable reference voltage, carry out the half-wave through the signal processing circuit to the original signal of sensor output and enlarge and the filtering, handle and carry to main control circuit after accomplishing, through ADC reference circuit output reference voltage signal and carry to main control circuit, export after will handling signal and reference voltage signal and calculate through main control circuit. The utility model provides a half-wave detection circuitry who possesses stable reference voltage has the improvement and detects accuracy nature to reduce measuring error's effect.
Drawings
Fig. 1 is a system block diagram of a half-wave detection circuit with stable reference voltage according to the present invention;
fig. 2 is a schematic structural diagram of a power supply circuit of the half-wave detection circuit with stable reference voltage according to the present invention;
fig. 3 is a schematic structural diagram of the light source driving circuit of the half-wave detection circuit with stable reference voltage according to the present invention;
fig. 4 is a schematic structural diagram of the signal processing circuit of the half-wave detection circuit with stable reference voltage according to the present invention;
fig. 5 is the structure diagram of the ADC reference circuit of the half-wave detection circuit with stable reference voltage of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the following specific examples, which should not be construed as limiting the invention.
Fig. 1 is the utility model discloses a system block diagram of the half-wave detection circuitry who possesses stable reference voltage, fig. 2 is the utility model discloses a structure schematic diagram of the power supply circuit who possesses stable reference voltage's half-wave detection circuitry, fig. 3 is the utility model discloses a structure schematic diagram of the light source drive circuit who possesses stable reference voltage's half-wave detection circuitry, fig. 4 is the utility model discloses a structure schematic diagram of the signal processing circuit who possesses stable reference voltage's half-wave detection circuitry, fig. 5 is the utility model discloses a structure schematic diagram of the ADC reference circuit who possesses stable reference voltage's half-wave detection circuitry, as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, the half-wave detection circuitry who possesses stable reference voltage that this embodiment provided: the light source driving circuit comprises a power supply circuit, the light source driving circuit, master control circuit, ADC reference circuit and signal processing circuit, power supply circuit's input is connected with external power supply electricity, power supply circuit's first output is connected with light source driving circuit electricity, power supply circuit's second output is connected with master control circuit electricity, power supply circuit's third output is connected with ADC reference circuit and signal processing circuit electricity respectively, master control circuit's signal output part is connected with light source driving circuit's signal input part electricity, light source driving circuit outputs optical signal, the sensor receives optical signal and converts the signal of telecommunication into and exports to signal processing circuit, signal processing circuit's signal output part is connected with master control circuit's detection signal input part electricity, ADC reference circuit is connected with master control circuit's contrast signal input part electricity.
In the above embodiment, the power supply circuit includes a light source driving power supply circuit, a main control chip power supply circuit and an operational amplifier power supply circuit, the light source driving power supply circuit, the main control chip power supply circuit and the operational amplifier power supply circuit have their inputs electrically connected to an external power supply, the output of the light source driving power supply circuit is electrically connected to the power input of the light source driving circuit as a first power output, the output of the main control chip power supply circuit is electrically connected to the power input of the main control circuit as a second power output, and the output of the operational amplifier power supply circuit is electrically connected to the ADC reference circuit and the signal processing circuit as a third power output.
In the above embodiment, the light source driving circuit includes a black body light source D3, a resistor R8, an MOS transistor Q1 and a resistor R9, an output end of the light source driving power supply circuit is electrically connected to an input end of the black body light source D3, an output end of the black body light source D3 is electrically connected to a drain of the MOS transistor Q1, a gate of the MOS transistor Q1 is electrically connected to a signal output end of the main control circuit through the resistor R8, a source of the MOS transistor Q1 is grounded, one end of the resistor R9 is electrically connected to the gate of the MOS transistor Q1, and the other end of the resistor R9 is electrically connected to the source of the MOS transistor Q1.
It should be noted that the MOS transistor Q1 is used as an analog switch, R8 is a resistor connected in series with the MOS transistor Q1 and used for current-limiting protection of the MOS transistor Q1, and R9 is a bleed resistor, so that the MOS transistor Q1 can realize a normal switching function under the PWM drive output by the single chip microcomputer.
In the above embodiment, the signal processing circuit includes an operational amplifier U10, a resistor R26, a capacitor C38, a resistor R29, a resistor R24, a capacitor C34, a capacitor C39, a resistor R22, a resistor R18, a capacitor C34, a resistor R13, a capacitor C32, a capacitor C37, a capacitor C35, a resistor R14, a capacitor C33, a capacitor C36, a resistor R19, a resistor R25, a capacitor C41, a resistor R28, a resistor R23, a capacitor C40, and a resistor R27, a power input end of the operational amplifier U10 is electrically connected to an output end of the operational amplifier power supply circuit, and a capacitor C37 and a capacitor C35 are connected in parallel between the power input end of the operational amplifier U10 and ground;
a first positive signal input end of the operational amplifier U10 is electrically connected with a signal output end of the sensor through a resistor R24 and a capacitor C38 in sequence, a signal output end of the sensor is grounded through a resistor R26, a common end of the capacitor C38 and the resistor R24 is electrically connected with an external reference voltage source through a resistor R29, a first positive signal input end of the operational amplifier U10 is grounded through a capacitor C39, a first negative signal input end of the operational amplifier U10 is electrically connected with the external reference voltage source through a resistor R22, a resistor R18 and a capacitor C34 are connected between the first negative signal input end of the operational amplifier U10 and the first signal output end of the operational amplifier U10 in parallel, a resistor R13 and a capacitor C32 are connected between the first signal output end of the operational amplifier U10 and the ground in sequence in series, and a common end of the resistor R13 and the capacitor C32 is electrically connected with a detection signal input end of the main control circuit;
the second positive signal input end of the operational amplifier U10 is grounded through a resistor R25, a capacitor C40 and a resistor R27 in sequence, the common end of the capacitor C40 and the resistor R27 is electrically connected with the other signal output end of the sensor, the second positive signal input end of the operational amplifier U10 is grounded through a capacitor C41, the common end of the resistor R25 and the capacitor C40 is electrically connected with an external reference voltage source through a resistor R28, the second negative signal input end of the operational amplifier U10 is electrically connected with the external reference voltage source through a resistor R23, a resistor R19 and a capacitor C36 are connected in parallel between the second negative signal input end of the operational amplifier U10 and the second signal output end of the operational amplifier U10, the second signal output end of the operational amplifier U10 is grounded through a resistor R14 and a capacitor C33, and the common end of the resistor R14 and the capacitor C33 is electrically connected with the other detection signal input end of the main control circuit.
It should be noted that, the SIGNALs REF _ NET and SIGNAL are original SIGNALs of the sensor, the original SIGNAL of SIGNAL converts current into a voltage SIGNAL through R26, then the voltage SIGNAL passes through a high pass filter composed of C38 and R29, then the SIGNAL is amplified through a low pass filter composed of R24 and C39, R22, R18 and C34 form a negative feedback circuit to amplify the SIGNAL in phase, and then the SIGNAL is transmitted to the main control ADC through a low pass filter composed of R13 and C32 to be collected, similarly, the processing mode of REF _ NET is the same as the above, wherein the external reference voltage source is an external 100mv dc voltage source, so that only the SIGNAL of the positive half axis can be amplified when the operational amplifier outputs, and the SIGNAL can be amplified as much as possible within a limited voltage threshold range to facilitate data processing.
In the above embodiment, the ADC reference circuit includes a resistor R20, a resistor R17, a resistor R16, a resistor R12, an operational amplifier U9, a resistor R15, a resistor R21, and a voltage regulator U8, an output end of the operational amplifier power supply circuit is electrically connected to a positive signal input end of the operational amplifier U9 through the resistor R20, a negative signal input end of the operational amplifier U9 is grounded through the resistor R17, the negative signal input end of the operational amplifier U9 is further electrically connected to a signal output end of the operational amplifier U9 through the resistor R16, the signal output end of the operational amplifier U9 is electrically connected to a comparison signal input end of the main control circuit through the resistor R12, the signal output end of the operational amplifier U9 is further electrically connected to the positive signal input end of the operational amplifier U9 through the resistor R12, a resistor R15 and a resistor R21 are sequentially connected in series between the positive signal input end of the operational amplifier U9 and the ground, a common end of the resistor R15 and the resistor R21 is electrically connected to a reference electrode of the voltage regulator U8, a cathode of the voltage regulator U8 is electrically connected to the positive signal input end of the operational amplifier U9, and an anode of the voltage regulator U8 is grounded.
The working principle is that the main control chip outputs PWM modulation signals to the light source driving circuit, the light source driving power supply circuit outputs 5V voltage to the black body light source D3, the black body light source D3 outputs infrared modulation light with specific frequency, the sensor receives light signals and outputs analog electric signals with the same frequency as the modulation light, the analog electric signals are transmitted to the signal processing circuit, the operational amplifier U5 receives the analog electric signals, then converts current signals into voltage signals through a resistor R26, carries out filtering through a high-pass filter consisting of a capacitor C38 and a resistor R29, then carries out signal amplification through a low-pass filter consisting of a resistor R24 and a capacitor C39, a negative feedback circuit consisting of a resistor R22, a resistor R18 and a capacitor C34 carries out in-phase amplification on the signals, then transmits the processed signals to an ADC of the main control chip through a low-pass filter consisting of a resistor R13 and a capacitor C32 for acquisition, the bias V _ REF is 100mv direct current voltage, so that only the signals of a positive half-axis can be amplified as much as possible to facilitate data processing within a limited voltage threshold range, and the main control chip processes the processed signals and transmits TTL data through a serial port for data transmission.
The above is merely a preferred embodiment of the present invention, and not intended to limit the scope and the range of the present invention, and those skilled in the art should be able to realize that all the equivalent substitutions and obvious changes made by the present invention description should be included in the scope of the present invention.
Claims (5)
1. A half-wave detection circuit having a stable reference voltage, characterized in that: including power supply circuit, light source drive circuit, master control circuit, ADC reference circuit and signal processing circuit, power supply circuit's input is connected with external power source electricity, power supply circuit's first output with light source drive circuit electricity is connected, power supply circuit's second output with master control circuit electricity is connected, power supply circuit's third output respectively with ADC reference circuit and signal processing circuit electricity are connected, master control circuit's signal output part with light source drive circuit's signal input part electricity is connected, light source drive circuit receives optical signal, and the sensor receives optical signal and converts the optical signal and exports to electric signal processing circuit, signal processing circuit's signal output part with master control circuit's detection signal input part electricity is connected, ADC reference circuit with master control circuit's contrast signal input part electricity is connected.
2. A half-wave detection circuit having a stable reference voltage according to claim 1, wherein: the power supply circuit includes light source drive power supply circuit, master control chip power supply circuit and fortune and puts power supply circuit, light source drive power supply circuit, master control chip power supply circuit and fortune put power supply circuit's input and all be connected with external power source electricity, light source drive power supply circuit's output as first power output end with light source drive circuit's power input end electricity is connected, master control chip power supply circuit's output as second power output end with master control circuit's power input end electricity is connected, fortune is put power supply circuit's output as third power output respectively with ADC reference circuit and signal processing circuit electricity is connected.
3. A half-wave detection circuit with a stable reference voltage as claimed in claim 2, characterized in that: light source drive circuit includes black body light source D3, resistance R8, MOS pipe Q1 and resistance R9, light source drive supply circuit's output with black body light source D3's input electricity is connected, black body light source D3's output with MOS pipe Q1's drain electrode electricity is connected, MOS pipe Q1's grid passes through resistance R8 with master control circuit's signal output part electricity is connected, MOS pipe Q1's source ground connection, resistance R9's one end with MOS pipe Q1's grid electricity is connected, resistance R9's the other end with MOS pipe Q1's source electricity is connected.
4. A half-wave detection circuit with a stable reference voltage as claimed in claim 3, characterized in that: the signal processing circuit comprises an operational amplifier U10, a resistor R26, a capacitor C38, a resistor R29, a resistor R24, a capacitor C34, a capacitor C39, a resistor R22, a resistor R18, a capacitor C34, a resistor R13, a capacitor C32, a capacitor C37, a capacitor C35, a resistor R14, a capacitor C33, a capacitor C36, a resistor R19, a resistor R25, a capacitor C41, a resistor R28, a resistor R23, a capacitor C40 and a resistor R27, wherein a power supply input end of the operational amplifier U10 is electrically connected with an output end of the operational amplifier power supply circuit, and the capacitor C37 and the capacitor C35 are connected between the power supply input end of the operational amplifier U10 and the ground in parallel;
a first positive signal input end of the operational amplifier U10 is electrically connected to a signal output end of the sensor through the resistor R24 and the capacitor C38 in sequence, a signal output end of the sensor is also grounded through the resistor R26, a common end of the capacitor C38 and the resistor R24 is electrically connected to an external reference voltage source through the resistor R29, a first positive signal input end of the operational amplifier U10 is grounded through the capacitor C39, a first negative signal input end of the operational amplifier U10 is electrically connected to the external reference voltage source through the resistor R22, the resistor R18 and the capacitor C34 are connected in parallel between the first negative signal input end of the operational amplifier U10 and the first signal output end of the operational amplifier U10, the resistor R13 and the capacitor C32 are connected in series between the first signal output end of the operational amplifier U10 and the ground in sequence, and a common end of the resistor R13 and the capacitor C32 is electrically connected to a detection signal input end of the main control circuit;
a second positive signal input end of the operational amplifier U10 is sequentially grounded through the resistor R25, the capacitor C40 and the resistor R27, a common end of the capacitor C40 and the resistor R27 is electrically connected with another signal output end of the sensor, a second positive signal input end of the operational amplifier U10 is grounded through the capacitor C41, a common end of the resistor R25 and the capacitor C40 is electrically connected with an external reference voltage source through the resistor R28, a second negative signal input end of the operational amplifier U10 is electrically connected with an external reference voltage source through the resistor R23, the resistor R19 and the capacitor C36 are connected in parallel between the second negative signal input end of the operational amplifier U10 and the second signal output end of the operational amplifier U10, the second signal output end of the operational amplifier U10 is grounded through the resistor R14 and the capacitor C33, and a common end of the resistor R14 and the capacitor C33 is electrically connected with another detection signal input end of the main control circuit.
5. A half-wave detection circuit with a stable reference voltage as claimed in claim 4, characterized in that: ADC reference circuit includes resistance R20, resistance R17, resistance R16, resistance R12, fortune and puts U9, resistance R15, resistance R21 and stabiliser U8, the output that supply circuit was put to fortune passes through resistance R20 with U9's positive signal input electricity is put to fortune is connected, U9's negative signal input end is put to fortune passes through resistance R17 ground connection, U9's negative signal input end is still passed through to fortune resistance R16 with U9's signal output end electricity is put to fortune is connected, U9's signal output end is put to fortune passes through resistance R12 with master control circuit contrast signal input electricity is connected, U9's signal output end is put to fortune still passes through resistance R12 with U9's positive signal input end electricity is put to fortune is connected, it has in order to establish ties between U9's positive signal input end and the ground resistance R15 with resistance R21, resistance R15 with resistance R21's common terminal with U8's reference pole is connected, U8's negative pole with U9's positive signal input end electricity is put to fortune, stabiliser U8's positive pole is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222182345.6U CN218413314U (en) | 2022-08-18 | 2022-08-18 | Half-wave detection circuit with stable reference voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222182345.6U CN218413314U (en) | 2022-08-18 | 2022-08-18 | Half-wave detection circuit with stable reference voltage |
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| CN218413314U true CN218413314U (en) | 2023-01-31 |
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| CN202222182345.6U Active CN218413314U (en) | 2022-08-18 | 2022-08-18 | Half-wave detection circuit with stable reference voltage |
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- 2022-08-18 CN CN202222182345.6U patent/CN218413314U/en active Active
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