CN209978979U - Measuring instrument accumulative gas amount detection circuit - Google Patents
Measuring instrument accumulative gas amount detection circuit Download PDFInfo
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- CN209978979U CN209978979U CN201920988261.7U CN201920988261U CN209978979U CN 209978979 U CN209978979 U CN 209978979U CN 201920988261 U CN201920988261 U CN 201920988261U CN 209978979 U CN209978979 U CN 209978979U
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Abstract
The utility model relates to a metering device field especially relates to a metering device accumulative total tolerance detection circuitry, include: the photoelectric conversion circuit is used for converting the pulse optical signals emitted by the air quantity detection lamp into pulse electrical signals; the double Schmitt type phase inverter is connected with the photoelectric conversion circuit and is used for converting the pulse electric signals output by the photoelectric conversion sensor into two pulse level signals with opposite phases; the phase shifting circuit is connected with the double Schmidt type phase inverter and is used for preventing the changed edges of the two pulse level signals with opposite phases from being in the same time; a push-pull output circuit connected with the phase shift circuit; and the processor is connected with the push-pull output circuit and is used for obtaining the accumulated gas quantity of the metering instrument according to the output of the push-pull output circuit. The utility model discloses possess following beneficial effect: the detection of the accumulated gas quantity of the metering instrument is realized through a photoelectric conversion circuit, a double Schmidt type phase inverter, a phase shift circuit, a push-pull output circuit and a processor which are connected in sequence.
Description
Technical Field
The utility model relates to a metering device field especially relates to a metering device accumulative total tolerance detection circuitry.
Background
In the detection of the gas accumulated amount, the gas leakage accumulated amount is generally determined by detecting the number of LED flashing pulses of a meter. The detection device can provide 5V-24V power supply voltage, and a device which can work in the voltage range is required to output low level (close to 0V) when the LED is not lighted and output high level (high level voltage follows the device power supply voltage) when the LED is lighted. However, the conventional photoelectric conversion device cannot support such a wide voltage input range, and it is a common practice to step down to a normal operating region of the photoelectric conversion device using a step-down circuit and then output a pulse through an open drain circuit or a push-pull circuit. The open-drain output mode can only ensure that the low level detection principle is available. The push-pull output mode can support high level detection and low level detection, but in practical cases, the switching of the switching tube also requires time, and two input signals may be high or low at the same time (the time is usually very short, in ns level) at the edge of the signal change. When the switching tubes are conducted simultaneously, the subsequent push-pull circuit is abnormal due to the condition, and a power supply is short-circuited, so that the circuit is damaged.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides a cumulative air volume detection circuit of metering device.
The utility model provides a measuring instrument accumulates tolerance detection circuitry, the last tolerance that is equipped with of measuring instrument sends pulsed light signal detects the lamp, detection circuitry includes:
the photoelectric conversion circuit is used for converting the pulse optical signals emitted by the air quantity detection lamp into pulse electrical signals;
the double Schmitt type phase inverter is connected with the photoelectric conversion circuit and is used for converting the pulse electric signals output by the photoelectric conversion sensor into two pulse level signals with opposite phases;
the phase shifting circuit is connected with the double Schmidt type phase inverter and is used for preventing the changed edges of the two pulse level signals with opposite phases from being in the same time;
a push-pull output circuit connected with the phase shift circuit; and
and the processor is connected with the push-pull output circuit and is used for obtaining the accumulated gas quantity of the metering instrument according to the output of the push-pull output circuit.
Preferably, the photoelectric conversion circuit includes: and a photoelectric converter Q4, one end of the photoelectric converter Q4 is connected with the power supply input end and the first input end of the double Schmidt type inverter, and the other end of the photoelectric converter Q4 is connected with a common ground.
Preferably, the photoelectric conversion circuit further includes: the photoelectric converter comprises resistors R9, R10, capacitors C7 and C8, one end of the photoelectric converter Q4 is connected with one end of a resistor R9 and one end of a resistor R10, the other end of the resistor R9 is connected with a power supply input end, the other end of the resistor R10 is connected with a first input end of a double Schmidt type inverter and one end of a capacitor C7, the other end of the capacitor C7 is connected with a common ground, one end of the capacitor C8 is connected with the common ground, and the other end of the capacitor C8 is connected with the power supply input end.
Preferably, a first output end of the double schmitt-type phase inverter is connected with the second input end and the phase shift circuit, and a second output end of the double schmitt-type phase inverter is connected with the phase shift circuit.
Preferably, the phase shift circuit includes: the first input end of the double AND gate circuit is connected with the first output end of the double Schmidt type phase inverter, the second input end of the double AND gate circuit is connected with the output end of the first RC circuit, the input end of the first RC circuit is connected with the first output end of the double Schmidt type phase inverter, the third input end of the double AND gate circuit is connected with the output end of the second RC circuit, the input end of the second RC circuit is connected with the second output end of the double Schmidt type phase inverter, the fourth input end of the double AND gate circuit is connected with the second output end of the double Schmidt type phase inverter, and the first output end and the second output end of the double AND gate circuit are both connected with the push-pull output circuit.
Preferably, the first RC circuit includes: the circuit comprises a resistor R11 and a capacitor C6, wherein one end of the resistor R11 is connected with a first output end of the double Schmidt type phase inverter, the other end of the resistor R11 is connected with a second input end of the double AND gate circuit and one end of the capacitor C6, and the other end of the capacitor C6 is connected with a common ground.
Preferably, the second RC circuit includes: the circuit comprises a resistor R12 and a capacitor C9, wherein one end of the resistor R12 is connected with the second output end of the double Schmidt type phase inverter, the other end of the resistor R11 is connected with the third input end of the double AND gate circuit and one end of the capacitor C9, and the other end of the capacitor C9 is connected with the common ground.
Preferably, the push-pull output circuit includes: resistors R1, R2, R3, R5, R7, R8, a transistor Q2, a PMOS Q1 and an NMOS Q3, wherein one end of the resistor R3 is connected to a first output end of a dual and gate circuit, the other end of the resistor R3 is connected to one end of a resistor R5 and a base of the transistor Q2, the other end of the resistor R5 is connected to a common ground, an emitter of the transistor Q2 is connected to a common ground, a collector of the transistor Q2 is connected to one end of a resistor R2, the other end of the resistor R2 is connected to one end of a resistor R1 and a gate of a PMOS Q1, the other end of the resistor R1 is connected to a power supply input end, a source of the PMOS Q1 is connected to a power supply input end, and a drain of the PMOS Q1 is connected; one end of the resistor R7 is connected with a second output end of the double-AND circuit, the other end of the resistor R7 is connected with one end of the resistor R8 and the grid electrode of the NMOS Q3, the other end of the resistor R8 is connected with a common ground, the source electrode of the NMOS Q3 is connected with the common ground, and the drain electrode of the NMOS Q3 is connected with the processor.
Preferably, the push-pull output circuit further includes: the power supply comprises a fuse F2, diodes D1, D2 and a capacitor C1, wherein one end of the fuse F2 is connected with the anode of a diode D1, the cathode of a diode D2, the drain of a PMOS Q1 and the drain of an NMOS Q3, the other end of the fuse F2 is connected with a processor, the anode of the diode D2 is connected with a common ground, the cathode of a diode D1 is connected with a power supply input end and one end of the capacitor C1, and the other end of the capacitor C1 is connected with the common ground.
Preferably, the method further comprises the following steps: and the stabilized voltage power supply circuit is connected with the photoelectric conversion circuit and the double Schmidt inverters.
The utility model discloses possess following beneficial effect:
1. the accumulated air quantity of the metering instrument is obtained through a photoelectric conversion circuit, a double Schmidt type phase inverter, a phase shift circuit, a push-pull output circuit and a processor which are connected in sequence;
2. the phase-shifting processing avoids the changed edges of two opposite-phase level signals at the same time, thereby avoiding the short circuit of a power supply and the damage of a circuit caused by the simultaneous conduction of switching tubes and ensuring that the push-pull output is more reliable;
3. the diodes D1 and D2 are used, so that the clamping voltage range follows the input voltage of the power supply, and the characteristic of wide voltage can be better matched. For current-limiting protection, the fuse F2 does not affect the circuit under normal conditions, and current limiting is triggered abnormally;
4. the input wide voltage is reduced to a fixed lower voltage by using a voltage-stabilized power supply circuit, and the voltage can ensure that a photoelectric conversion circuit, a double-Schmidt inverter and a phase-shifting circuit in a subsequent circuit can work normally.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic connection diagram of a measuring instrument cumulative air volume detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a photoelectric conversion circuit in the measuring instrument cumulative air volume detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic connection diagram of a double schmitt-type phase inverter in the measuring instrument cumulative air volume detecting circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an output signal of a double schmitt-type phase inverter in a measuring instrument cumulative air volume detecting circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a phase shift circuit in the measuring instrument cumulative air volume detection circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an output signal of a phase shift circuit in the measuring instrument cumulative air volume detecting circuit according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a push-pull output circuit in the measuring instrument accumulated air amount detecting circuit according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a push-pull output circuit in the measuring instrument accumulated air amount detecting circuit according to another embodiment of the present invention;
fig. 9 is a schematic connection diagram of a voltage-stabilized power supply circuit in the measuring instrument accumulated air amount detecting circuit according to an embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a voltage-stabilized power supply circuit in the measuring instrument cumulative air amount detection circuit according to another embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The basic idea of this embodiment is to output pulses using a push-pull output circuit, but a photoelectric conversion circuit, a double schmitt-type inverter, and a phase shift circuit are connected to the input terminal of the push-pull output circuit. The photoelectric conversion circuit is used for converting a pulse optical signal emitted by an air quantity detection lamp of the metering instrument into a pulse electrical signal; the double Schmitt type phase inverter is used for converting the pulse electrical signal output by the photoelectric conversion sensor into two pulse level signals with opposite phases; the phase shift circuit is used for avoiding the change edges of two opposite-phase level signals from being in the same time, so that the power supply short circuit and the circuit damage caused by the simultaneous conduction of the switching tubes are avoided, and the processor obtains the accumulated air quantity of the metering instrument according to the output of the push-pull output circuit.
Based on the above thought, an embodiment of the utility model provides a measuring instrument accumulates tolerance detection circuitry, be equipped with the tolerance detection lamp that sends pulsed light signal on the measuring instrument, as shown in fig. 1, this detection circuitry includes: the photoelectric conversion circuit is used for converting the pulse optical signals emitted by the air quantity detection lamp into pulse electrical signals; the double Schmitt type phase inverter is connected with the photoelectric conversion circuit and is used for converting the pulse electric signals output by the photoelectric conversion sensor into two pulse level signals with opposite phases; the phase shifting circuit is connected with the double Schmidt type phase inverter and is used for preventing the changed edges of the two pulse level signals with opposite phases from being in the same time; a push-pull output circuit connected with the phase shift circuit; and the processor is connected with the push-pull output circuit and is used for obtaining the accumulated gas quantity of the metering instrument according to the output of the push-pull output circuit.
As shown in fig. 2, the core element of the photoelectric conversion circuit is a photoelectric converter Q4, and when the photoelectric converter Q4 is irradiated with light of a specific wavelength, a current is generated, and the larger the light intensity is, the larger the induced current is. Further, the photoelectric conversion circuit further includes: the photoelectric converter comprises resistors R9, R10, capacitors C7 and C8, one end of the photoelectric converter Q4 is connected with one end of a resistor R9 and one end of a resistor R10, the other end of the resistor R9 is connected with a power supply input end, the other end of the resistor R10 is connected with a first input end of a double Schmidt type inverter and one end of a capacitor C7, the other end of the capacitor C7 is connected with a common ground, one end of the capacitor C8 is connected with the common ground, and the other end of the capacitor C8 is connected with the power supply input end.
The photoelectric converter Q4 uses billion light PT19-315C, which is sensitive to visible light wave band, wherein the photoelectric converter Q4 is most sensitive to 630nm red light. Adjusting the resistance R9 can adjust the sensitivity to light, with greater resistance R9 being more sensitive. The stronger the light, the lower the output voltage of the photoelectric conversion circuit. When the output voltage is lower than 1/3Vcc or higher than 2/3Vcc, the output level of the double Schmidt inverter can be inverted. The resistor R10 and the capacitor C7 form RC filtering, so that fine burr signals input into the double Schmitt type phase inverter can be filtered, and the double Schmitt type phase inverter is prevented from being triggered by interference signals for multiple times. Strictly speaking, the photoelectric converter Q4 directly outputs an analog voltage signal related to light intensity, and does not have a high-low digital level signal, and therefore, a process by a double schmitt-type inverter is also required.
As shown in fig. 3, a first input terminal of the double schmitt-type inverter is connected to the output terminal of the photoelectric conversion circuit, a first output terminal of the double schmitt-type inverter is connected to the second input terminal and the phase shift circuit, and a second output terminal of the double schmitt-type inverter is connected to the phase shift circuit.
The double schmitt type inverter uses TI's 74LVC2G14, a two channel flip-flop, which also has an inverting function. Finally, two channels of the double schmitt type inverter respectively output two pulse level signals Y1 and Y2 with inverted phases, as shown in fig. 4.
As shown in fig. 5, the phase shift circuit includes: the first input end of the double AND gate circuit is connected with the first output end of the double Schmidt type phase inverter, the second input end of the double AND gate circuit is connected with the output end of the first RC circuit, the input end of the first RC circuit is connected with the first output end of the double Schmidt type phase inverter, the third input end of the double AND gate circuit is connected with the output end of the second RC circuit, the input end of the second RC circuit is connected with the second output end of the double Schmidt type phase inverter, the fourth input end of the double AND gate circuit is connected with the second output end of the double Schmidt type phase inverter, and the first output end and the second output end of the double AND gate circuit are both connected with the push-pull output circuit.
Wherein the first RC circuit comprises: the circuit comprises a resistor R11 and a capacitor C6, wherein one end of the resistor R11 is connected with a first output end of the double Schmidt type phase inverter, the other end of the resistor R11 is connected with a second input end of the double AND gate circuit and one end of the capacitor C6, and the other end of the capacitor C6 is connected with a common ground.
Wherein the second RC circuit comprises: the circuit comprises a resistor R12 and a capacitor C9, wherein one end of the resistor R12 is connected with the second output end of the double Schmidt type phase inverter, the other end of the resistor R11 is connected with the third input end of the double AND gate circuit and one end of the capacitor C9, and the other end of the capacitor C9 is connected with the common ground.
In fact, due to the fact that time difference exists between the two MOS tubes in the process of alternately conducting and stopping, a very short time is probably existed, and the two MOS tubes are both in a conducting state, so that the power supply is short-circuited. Therefore, a phase shift circuit is required to be introduced, and the change time of the two paths of signals is slightly staggered. As shown in fig. 6, a1 is a first input end pulse level signal, B1 is a second input end pulse level signal, Y1 is a first output end pulse level signal, a2 is a third input end pulse level signal, B2 is a fourth input end pulse level signal, and Y2 is a second output end pulse level signal, the edge time of the B1 and B2 pulse signals is prolonged by the two RC circuits, the voltage below 0.3VCC is identified as low level by the dual and gate circuit, and the voltage above 0.7VCC is identified as high level by the dual and gate circuit. Wherein the staggered time depends on the RC value, and the RC value cannot be too large. By introducing the phase shift circuit, the push-pull output circuit works more reliably.
As shown in fig. 7, the push-pull output circuit includes: resistors R1, R2, R3, R5, R7, R8, a transistor Q2, a PMOS Q1 and an NMOS Q3, wherein one end of the resistor R3 is connected to a first output end of a dual and gate circuit, the other end of the resistor R3 is connected to one end of a resistor R5 and a base of the transistor Q2, the other end of the resistor R5 is connected to a common ground, an emitter of the transistor Q2 is connected to a common ground, a collector of the transistor Q2 is connected to one end of a resistor R2, the other end of the resistor R2 is connected to one end of a resistor R1 and a gate of a PMOS Q1, the other end of the resistor R1 is connected to a power supply input end, a source of the PMOS Q1 is connected to a power supply input end, and a drain of the PMOS Q1 is connected; one end of the resistor R7 is connected with a second output end of the double-AND circuit, the other end of the resistor R7 is connected with one end of the resistor R8 and the grid electrode of the NMOS Q3, the other end of the resistor R8 is connected with a common ground, the source electrode of the NMOS Q3 is connected with the common ground, and the drain electrode of the NMOS Q3 is connected with the processor.
The signal Y1 controls PMOS Q1, the signal Y2 controls NMOS Q3, and the control logic is both high on and low off. When the signal Y1 outputs a high level and the signal Y2 outputs a low level, the triode Q2 is conducted, the PMOS Q1 is conducted, the NMOS Q3 is cut off, and the power supply voltage is output in a pulse mode; when the signal Y1 outputs a low level and the signal Y2 outputs a high level, the transistor Q2 is turned off, the PMOSQ1 is turned off, the NMOS Q3 is turned on, and the common ground voltage is pulsed. Since the Y1 and Y2 signals are phase-shifted, the PMOS Q1 and NMOS Q3 cannot be turned on simultaneously. The PMOS Q1 is WPM3012, the limit GS withstand voltage is 20V, and the minimum GS starting voltage is required to be more than 3V. However, the actual working voltage range is 5V-24V, and the GS can be higher than the starting voltage by dividing voltage through two resistors R1 and R2 when the lowest voltage is supplied by 5V, and can be lower than the limit voltage-withstanding value of 20V when the highest voltage is supplied by 24V. By using a push-pull output pulse method, all pulse detection principles can be applied.
As shown in fig. 8, in an embodiment, the push-pull output circuit further includes: the power supply comprises a fuse F2, diodes D1, D2 and a capacitor C1, wherein one end of the fuse F2 is connected with the anode of a diode D1, the cathode of a diode D2, the drain of a PMOS Q1 and the drain of an NMOS Q3, the other end of the fuse F2 is connected with a processor, the anode of the diode D2 is connected with a common ground, the cathode of a diode D1 is connected with a power supply input end and one end of the capacitor C1, and the other end of the capacitor C1 is connected with the common ground.
Two diodes D1 and D2 are added at the output end of the push-pull output circuit, and the voltage of the output signal end is limited between-0.7V and 24.7V, so that the interface has certain anti-surge interference capability when being connected to different external detection equipment, and an internal circuit is protected. Meanwhile, due to the fact that the push-pull output circuit is used, the driving capacity of output pulses is high, in order to protect a switch tube in the push-pull circuit, a 500mA self-recovery fuse F2 is added to pulse output, and the circuit cannot be damaged accidentally even if external interfaces are connected in a wrong mode.
The processor in this embodiment includes an arithmetic logic unit, a register unit, a control unit, and the like, and has functions of processing instructions, performing operations, controlling time, processing data, and the like. The processor can judge the number of the scintillation pulses sent by the gas amount detection lamp by detecting the received high-low level pulse signals, and thus the detection of the accumulated gas amount of the metering instrument can be realized according to the number of the pulses.
In an embodiment, as shown in fig. 9, the present invention further includes: and the stabilized voltage power supply circuit is connected with the photoelectric conversion circuit and the double Schmidt inverters. As shown in fig. 10, the regulated power supply circuit includes: regulated power supply chip U1, capacitors C2, C3 and C4, and V of the regulated power supply chipINThe end is connected with the power input end, the GND end is connected with the common ground, VOUTAnd the power output end is connected, one end of the capacitor C2 is connected with the power input end, the other end of the capacitor C3 is connected with the common ground, one end of the capacitor C4 is connected with the power output end, and the other end of the capacitor C4 is connected with the common ground.
The regulated power supply chip U1 adopts TLV76033 of TI, the input voltage range can support 5V-30V, the output voltage is fixed 3.3V, and the maximum output load can reach 100 mA. Only a few ceramic capacitors C2, C3 and C4 are needed on the periphery, and the power supply requirement can be met. The voltage-stabilizing power supply chip U1 reduces the 5V-24V input voltage VDD to a fixed lower voltage VCC (below 5V), and the VCC voltage can make the photoelectric conversion circuit, the double Schmidt inverter and the like in the subsequent circuit work normally.
Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides a measuring instrument accumulates tolerance detection circuitry, the last tolerance that is equipped with emission pulse optical signal of measuring instrument detects the lamp, its characterized in that, detection circuitry includes:
the photoelectric conversion circuit is used for converting the pulse optical signals emitted by the air quantity detection lamp into pulse electrical signals;
the double Schmitt type phase inverter is connected with the photoelectric conversion circuit and is used for converting the pulse electric signals output by the photoelectric conversion sensor into two pulse level signals with opposite phases;
the phase shifting circuit is connected with the double Schmidt type phase inverter and is used for preventing the changed edges of the two pulse level signals with opposite phases from being in the same time;
a push-pull output circuit connected with the phase shift circuit; and
and the processor is connected with the push-pull output circuit and is used for obtaining the accumulated gas quantity of the metering instrument according to the output of the push-pull output circuit.
2. The measuring instrument gas accumulation amount detection circuit according to claim 1, wherein the photoelectric conversion circuit comprises: and a photoelectric converter Q4, one end of the photoelectric converter Q4 is connected with the power supply input end and the first input end of the double Schmidt type inverter, and the other end of the photoelectric converter Q4 is connected with a common ground.
3. The integrated gas amount detection circuit for a metering device of claim 2, wherein the photoelectric conversion circuit further comprises: the photoelectric converter comprises resistors R9, R10, capacitors C7 and C8, one end of the photoelectric converter Q4 is connected with one end of a resistor R9 and one end of a resistor R10, the other end of the resistor R9 is connected with a power supply input end, the other end of the resistor R10 is connected with a first input end of a double Schmidt type inverter and one end of a capacitor C7, the other end of the capacitor C7 is connected with a common ground, one end of the capacitor C8 is connected with the common ground, and the other end of the capacitor C8 is connected with the power supply input end.
4. The circuit for detecting the accumulated gas amount of the metering device as claimed in claim 3, wherein a first output end of the double Schmitt-type phase inverter is connected to a second input end and the phase shift circuit, and a second output end of the double Schmitt-type phase inverter is connected to the phase shift circuit.
5. The circuit for detecting the accumulated gas amount of the metering device according to claim 4, wherein the phase shift circuit comprises: the first input end of the double AND gate circuit is connected with the first output end of the double Schmidt type phase inverter, the second input end of the double AND gate circuit is connected with the output end of the first RC circuit, the input end of the first RC circuit is connected with the first output end of the double Schmidt type phase inverter, the third input end of the double AND gate circuit is connected with the output end of the second RC circuit, the input end of the second RC circuit is connected with the second output end of the double Schmidt type phase inverter, the fourth input end of the double AND gate circuit is connected with the second output end of the double Schmidt type phase inverter, and the first output end and the second output end of the double AND gate circuit are both connected with the push-pull output circuit.
6. The circuit for detecting the accumulated gas amount in the metering device according to claim 5, wherein the first RC circuit comprises: the circuit comprises a resistor R11 and a capacitor C6, wherein one end of the resistor R11 is connected with a first output end of the double Schmidt type phase inverter, the other end of the resistor R11 is connected with a second input end of the double AND gate circuit and one end of the capacitor C6, and the other end of the capacitor C6 is connected with a common ground.
7. The circuit for detecting the accumulated gas amount in the metering device according to claim 5, wherein the second RC circuit comprises: the circuit comprises a resistor R12 and a capacitor C9, wherein one end of the resistor R12 is connected with the second output end of the double Schmidt type phase inverter, the other end of the resistor R11 is connected with the third input end of the double AND gate circuit and one end of the capacitor C9, and the other end of the capacitor C9 is connected with the common ground.
8. The circuit for detecting the accumulated gas amount of the metering device according to claim 5, wherein the push-pull output circuit comprises: resistors R1, R2, R3, R5, R7, R8, a transistor Q2, a PMOS Q1 and an NMOS Q3, wherein one end of the resistor R3 is connected to a first output end of a dual and gate circuit, the other end of the resistor R3 is connected to one end of a resistor R5 and a base of the transistor Q2, the other end of the resistor R5 is connected to a common ground, an emitter of the transistor Q2 is connected to a common ground, a collector of the transistor Q2 is connected to one end of a resistor R2, the other end of the resistor R2 is connected to one end of a resistor R1 and a gate of a PMOS Q1, the other end of the resistor R1 is connected to a power supply input end, a source of the PMOS Q1 is connected to a power supply input end, and a drain of the PMOS Q1 is connected; one end of the resistor R7 is connected with a second output end of the double-AND circuit, the other end of the resistor R7 is connected with one end of the resistor R8 and the grid electrode of the NMOS Q3, the other end of the resistor R8 is connected with a common ground, the source electrode of the NMOS Q3 is connected with the common ground, and the drain electrode of the NMOS Q3 is connected with the processor.
9. The circuit for detecting the accumulated gas amount in the metering device according to claim 8, wherein the push-pull output circuit further comprises: the power supply comprises a fuse F2, diodes D1, D2 and a capacitor C1, wherein one end of the fuse F2 is connected with the anode of a diode D1, the cathode of a diode D2, the drain of a PMOS Q1 and the drain of an NMOS Q3, the other end of the fuse F2 is connected with a processor, the anode of the diode D2 is connected with a common ground, the cathode of a diode D1 is connected with a power supply input end and one end of the capacitor C1, and the other end of the capacitor C1 is connected with the common ground.
10. The circuit for detecting the accumulated gas amount of the metering device according to any one of claims 1 to 9, further comprising: and the stabilized voltage power supply circuit is connected with the photoelectric conversion circuit and the double Schmidt inverters.
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| CN201920988261.7U CN209978979U (en) | 2019-06-28 | 2019-06-28 | Measuring instrument accumulative gas amount detection circuit |
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| CN201920988261.7U CN209978979U (en) | 2019-06-28 | 2019-06-28 | Measuring instrument accumulative gas amount detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319893A (en) * | 2019-06-28 | 2019-10-11 | 金卡智能集团股份有限公司 | A kind of measuring instrument device gas detection circuit and method |
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2019
- 2019-06-28 CN CN201920988261.7U patent/CN209978979U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319893A (en) * | 2019-06-28 | 2019-10-11 | 金卡智能集团股份有限公司 | A kind of measuring instrument device gas detection circuit and method |
| CN110319893B (en) * | 2019-06-28 | 2024-02-23 | 金卡智能集团股份有限公司 | Metering instrument accumulated gas quantity detection circuit and method |
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