CN110319894A - A kind of pulse signal detection circuit applied to measuring instrument - Google Patents
A kind of pulse signal detection circuit applied to measuring instrument Download PDFInfo
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- CN110319894A CN110319894A CN201910573018.3A CN201910573018A CN110319894A CN 110319894 A CN110319894 A CN 110319894A CN 201910573018 A CN201910573018 A CN 201910573018A CN 110319894 A CN110319894 A CN 110319894A
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 230000010363 phase shift Effects 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000005611 electricity Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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- 239000013589 supplement Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/661—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters using light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
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- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manipulation Of Pulses (AREA)
Abstract
The present invention relates to measuring instrument field more particularly to a kind of pulse signal detection circuits applied to measuring instrument, comprising: input terminal connects double Schmidt's type phase inverters of pulse signal, for pulse signal to be converted to two impulse level signals of reverse phase；The phase-shift circuit being connect with double Schmidt's type phase inverters, for avoiding the edge of two impulse level signal intensities of reverse phase from being in the same time；The push-pull output circuit being connect with phase-shift circuit；And the processor being connect with push-pull output circuit, for output the detecting to pulse signal according to push-pull output circuit.The present invention has following the utility model has the advantages that by sequentially connected double Schmidt's type phase inverters, phase-shift circuit, push-pull output circuit and processor, realizes the detection of pulse signal.
Description
Technical field
The present invention relates to measuring instrument field more particularly to a kind of pulse signal detection circuits applied to measuring instrument.
Background technique
In the detection of gas device gas, usually by the LED scintillation pulse quantity of detection measuring instrument, to gauge
The device gas of table is detected.
The cardinal principle of detection pulse can be summarized as detection high level and detect low level.It detects high level and needs high electricity
Flat voltage output has stronger driving capability, and detection low level needs low level voltage output to have stronger driving capability.
And the scheme actually used is usually open-drain output or push-pull output, open-drain output mode can only ensure that low level testing principle can
With.Push-pull output mode can support high level detection to detect with low level, but be easy to appear switching tube and simultaneously turn on, and lead to electricity
Source short circuit, damages circuit.
Summary of the invention
To solve the above problems, the present invention proposes a kind of pulse signal detection circuit applied to measuring instrument.
A kind of pulse signal detection circuit applied to measuring instrument, comprising:
Input terminal connects double Schmidt's type phase inverters of pulse signal, for pulse signal to be converted to two arteries and veins of reverse phase
Rush level signal；
The phase-shift circuit being connect with double Schmidt's type phase inverters, for avoiding two impulse level signal intensities of reverse phase
Edge is in the same time；
The push-pull output circuit being connect with phase-shift circuit；And
The processor being connect with push-pull output circuit, the progress for the output according to push-pull output circuit to pulse signal
Detection.
Preferably, the first input end of double Schmidt's type phase inverters connects pulse signal, and double Schmidt's types are anti-
First output end of phase device connects the second input terminal and phase-shift circuit, and the second output terminal of double Schmidt's type phase inverters connects
Connect phase-shift circuit.
Preferably, the phase-shift circuit includes: the first RC circuit, the 2nd RC circuit and double AND gate circuits, it is described it is double with
The first input end of gate circuit connects the first output end of double Schmidt's type phase inverters, the second input terminal of double AND gate circuits
The output end of the first RC circuit is connected, the input terminal of the first RC circuit connects the first output of double Schmidt's type phase inverters
End, the third input terminal of double AND gate circuits connect the output end of the 2nd RC circuit, and the input terminal of the 2nd RC circuit connects
The second output terminal of double Schmidt's type phase inverters is connect, the 4th input terminal of double AND gate circuits connects double Schmidt's type phase inverters
Second output terminal, the first output end and second output terminal of double AND gate circuits be all connected with push-pull output circuit.
Preferably, the first RC circuit includes: resistance R11 and capacitor C6, and one end of the resistance R11 connects double Shi Mi
First output end of special type phase inverter, the other end of the resistance R11 connect the second input terminal and capacitor of double AND gate circuits
One end of C6, the other end connection of the capacitor C6 is publicly.
Preferably, the 2nd RC circuit includes: resistance R12 and capacitor C9, and one end of the resistance R12 connects double Shi Mi
The second output terminal of special type phase inverter, the other end of the resistance R11 connect the third input terminal and capacitor of double AND gate circuits
One end of C9, the other end connection of the capacitor C9 is publicly.
Preferably, the push-pull output circuit include: resistance R1, R2, R3, R5, R7, R8, triode Q2, PMOS Q1 with
And one end of NMOS Q3, the resistance R3 connect the first output end of double AND gate circuits, the other end of the resistance R3 connects electricity
One end of R5 and the base stage of triode Q2 are hindered, the other end of the resistance R5 connects the publicly transmitting of the triode Q2
Pole connects publicly, and one end of the collector connection resistance R2 of the triode Q2, the other end of the resistance R2 connects resistance
The other end of one end of R1 and the grid of PMOS Q1, the resistance R1 connects power input, the source electrode of the PMOS Q1
Power input is connected, the drain connections of the PMOS Q1 manage device；One end of the resistance R7 connects the of double AND gate circuits
Two output ends, one end of the other end connection resistance R8 of the resistance R7 and the grid of NMOS Q3, the resistance R8's is another
Publicly, publicly, the drain connections of the NMOS Q3 manage device for the source electrode connection of the NMOS Q3 for end connection.
Preferably, the push-pull output circuit further include: fuse F2, diode D1, D2 and capacitor C1, the insurance
One end connection anode of diode D1, the cathode of diode D2, the drain electrode of PMOS Q1 and the drain electrode of NMOS Q3 of silk F2, institute
The other end connection processor of fuse F2 is stated, the anode of the diode D2 connects publicly, the cathode of the diode D1
Power input and one end of capacitor C1 are connected, the other end connection of the capacitor C1 is publicly.
Preferably, further includes: the voltage-stabilized power supply circuit being connect with double Schmidt's type phase inverters.
The present invention have it is following the utility model has the advantages that
1. being realized by sequentially connected double Schmidt's type phase inverters, phase-shift circuit, push-pull output circuit and processor
The detection of pulse signal obtains the device gas of measuring instrument according to the detection of pulse signal；
2. the same time is in by the edge that phase-shift circuit is used to that two level signals of reverse phase to be avoided to change, to keep away
Having exempted from switching tube leads to power supply short circuit and damage circuit due to simultaneously turning on, so that push-pull output circuit is relatively reliable；
3. can more preferably cooperate Width funtion so that Clamping voltages range follows power input voltage using diode D1, D2
Characteristic.And for current-limiting protection, fuse F2 does not influence circuit work, exception-triggered current limliting under normal circumstances；
4. utilizing voltage-stabilized power supply circuit, input Width funtion is reduced to a fixed lower voltage, which can make
Obtaining the photoelectric conversion circuit in subsequent conditioning circuit, double Schmidt's type phase inverters, phase-shift circuit can work normally.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a kind of connection schematic diagram of the pulse signal detection circuit applied to measuring instrument of one embodiment of the invention；
Fig. 2 is that double Schmidt's types are anti-in a kind of pulse signal detection circuit applied to measuring instrument of one embodiment of the invention
The connection schematic diagram of phase device；
Fig. 3 is that double Schmidt's types are anti-in a kind of pulse signal detection circuit applied to measuring instrument of one embodiment of the invention
The schematic diagram of phase device output signal；
Fig. 4 is the electricity of phase-shift circuit in a kind of pulse signal detection circuit applied to measuring instrument of one embodiment of the invention
Road schematic diagram；
Fig. 5 is that phase-shift circuit exports in a kind of pulse signal detection circuit applied to measuring instrument of one embodiment of the invention
The schematic diagram of signal；
Fig. 6 is push-pull output circuit in a kind of pulse signal detection circuit applied to measuring instrument of one embodiment of the invention
Circuit diagram；
Fig. 7 is push-pull output electricity in a kind of pulse signal detection circuit applied to measuring instrument of another embodiment of the present invention
The circuit diagram on road；
Fig. 8 is voltage-stabilized power supply circuit in a kind of pulse signal detection circuit applied to measuring instrument of one embodiment of the invention
Connection schematic diagram；
Fig. 9 is regulated power supply electricity in a kind of pulse signal detection circuit applied to measuring instrument of another embodiment of the present invention
The circuit diagram on road.
Specific embodiment
Below in conjunction with attached drawing, technical scheme of the present invention will be further described, but the present invention is not limited to these realities
Apply example.
The basic thought of the present embodiment is to export pulse using push-pull output circuit, but in the input of push-pull output circuit
End connects double Schmidt's type phase inverters and phase-shift circuit.Double Schmidt's type phase inverters are used to pulse signal being converted to reverse phase
Two impulse level signals；The edge that phase-shift circuit is used to that two level signals of reverse phase to be avoided to change is in the same time, from
And avoiding switching tube leads to power supply short circuit and damage circuit due to simultaneously turning on, and obtains gauge according to the detection of pulse signal
The device gas of table.
Based on above-mentioned thought, one embodiment of the invention proposes a kind of pulse signal detection circuit applied to measuring instrument,
As shown in Figure 1, comprising: input terminal connects double Schmidt's type phase inverters of pulse signal, for pulse signal to be converted to reverse phase
Two impulse level signals；The phase-shift circuit being connect with double Schmidt's type phase inverters, for avoiding two pulse electricity of reverse phase
The edge of flat signal intensity is in the same time；The push-pull output circuit being connect with phase-shift circuit；And and push-pull output circuit
The processor of connection, for output the detecting to pulse signal according to push-pull output circuit.
As shown in Fig. 2, the first input end of double Schmidt's type phase inverters connects pulse signal, double Schmidt's type reverse phases
First output end of device connects the second input terminal and phase-shift circuit, the second output terminal connection of double Schmidt's type phase inverters
Phase-shift circuit.
Double Schmidt's type phase inverters use the 74LVC2G14 of TI, the trigger comprising two channels, which also has
The function of reverse phase.Two channels of final double Schmidt's type phase inverters export two impulse levels signal Y1, Y2 of reverse phase respectively,
As shown in Figure 3.Pulse signal can be converted to height digital signal level by the processing of double Schmidt's type phase inverters.
As shown in figure 4, phase-shift circuit includes: the first RC circuit, the 2nd RC circuit and double AND gate circuits, the double and door
The first input end of circuit connects the first output end of double Schmidt's type phase inverters, and the second input terminal of double AND gate circuits connects
The output end of the first RC circuit is connect, the input terminal of the first RC circuit connects the first output end of double Schmidt's type phase inverters,
The third input terminal of double AND gate circuits connects the output end of the 2nd RC circuit, and the input terminal connection of the 2nd RC circuit is double
The second output terminal of Schmidt's type phase inverter, the 4th input terminal of double AND gate circuits connect the of double Schmidt's type phase inverters
Two output ends, the first output end and second output terminal of double AND gate circuits are all connected with push-pull output circuit.
Wherein, the first RC circuit includes: resistance R11 and capacitor C6, and it is anti-that one end of the resistance R11 connects double Schmidt's types
First output end of phase device, the other end of the resistance R11 connect double AND gate circuits the second input terminal and capacitor C6 one
End, the other end connection of the capacitor C6 is publicly.
Wherein, the 2nd RC circuit includes: resistance R12 and capacitor C9, and it is anti-that one end of the resistance R12 connects double Schmidt's types
The second output terminal of phase device, the other end of the resistance R11 connect double AND gate circuits third input terminal and capacitor C9 one
End, the other end connection of the capacitor C9 is publicly.
Since there are the time differences in actually two metal-oxide-semiconductor alternate conductions and procedures of turn-off, it is possible that there are one section of poles
Short time, two MOS lead to power supply short circuit all on state.Therefore it needs to introduce phase-shift circuit, two paths of signals is become
The opportunity of change is slightly misaligned.As shown in figure 5, A1 is first input end impulse level signal, B1 is the second input terminal impulse level
Signal, Y1 are the first reproduced pulse level signal, and A2 is third input terminal impulse level signal, and B2 is the 4th input terminal pulse
Level signal, Y2 are second output terminal impulse level signal, and two RC circuits extend B1, B2 pulse signal edge time,
Double AND gate circuits can be by 0.3VCC voltage identification below at low level, and the voltage identification of 0.7VCC or more is utilized at high level
Above-mentioned characteristic finally makes double edges two paths of signals Y1, Y2 with door output be staggered completely, avoids rear class push-pull circuit MOS
Pipe simultaneously turns on.Wherein, the time being staggered depends on RC value, while RC value also can not be excessive.
As shown in fig. 6, push-pull output circuit include: resistance R1, R2, R3, R5, R7, R8, triode Q2, PMOS Q1 and
One end of NMOS Q3, the resistance R3 connect the first output end of double AND gate circuits, and the other end of the resistance R3 connects resistance
One end of R5 and the base stage of triode Q2, the other end of the resistance R5 connect publicly, the emitter of the triode Q2
Publicly, one end of the collector connection resistance R2 of the triode Q2, the other end of the resistance R2 connects resistance R1 for connection
One end and PMOS Q1 grid, the other end of the resistance R1 connects power input, and the source electrode of the PMOS Q1 connects
Power input is connect, the drain connections of the PMOS Q1 manage device；One end of the resistance R7 connects the second of double AND gate circuits
Output end, one end of the other end connection resistance R8 of the resistance R7 and the grid of NMOS Q3, the other end of the resistance R8
Publicly, publicly, the drain connections of the NMOS Q3 manage device for the source electrode connection of the NMOS Q3 for connection.
Signal Y1 controls PMOS Q1, and signal Y2 controls NMOS Q3, and control logic is high level conducting, and low level is cut
Only.When signal Y1 exports high level, signal Y2 output low level, triode Q2 conducting, PMOS Q1 conducting, NMOS Q3 sections
Only, pulse output supply voltage；When signal Y1 exports low level, signal Y2 output high level, triode Q2 cut-off, PMOS
Q1 cut-off, NMOS Q3 conducting, pulse export public ground voltage.Since signal Y1 and Y2 signal have passed through phase shift dislocation processing, institute
It can not be simultaneously turned on PMOS Q1 and NMOS Q3.Wherein, that PMOS Q1 is selected is WPM3012, and limit GS proof voltage is
The minimum cut-in voltage of 20V, GS is needed in 3V or more.However real work voltage range is 5V~24V, passes through resistance R1 and R2 two
A electric resistance partial pressure, in minimum 5V power supply, GS can be higher than cut-in voltage, and in highest 24V power supply, GS can be lower than 20V again
Limit pressure voltage.
As shown in fig. 7, in one embodiment, push-pull output circuit further include: fuse F2, diode D1, D2 and electricity
Hold C1, the fuse F2 one end connection the anode of diode D1, the cathode of diode D2, PMOS Q1 drain electrode and
The drain electrode of NMOS Q3, the other end of the fuse F2 connect processor, and the anode of the diode D2 connects publicly, institute
Cathode connection power input and one end of capacitor C1 of diode D1 are stated, the other end connection of the capacitor C1 is publicly.
Two diodes D1, D2 are added in the output end of push-pull output circuit, the voltage of output signal end is limited in-
Between 0.7V~24.7V, so that interface has certain Anti-surging interference performance when accessing different external detection equipments,
Protect internal circuit.Simultaneously as having used push-pull output circuit, the driving capability for exporting pulse is stronger, pushes away to protect
The switching tube in circuit is drawn, pulse exports the self-recovery fuse F2 that joined 500mA, external interface wiring error not
It can accidental damage circuit.
Processor in the present embodiment includes arithmetic and logic unit, register block and control unit etc., and has processing
Instruction executes the functions such as operation, control time, processing data.Processor carries out pulse letter according to the output of push-pull output circuit
Number detection.Processor, which receives low and high level pulse signal by detection, can judge that gas output detects lamp and issues scintillation pulse
Quantity realizes the detection to measuring instrument device gas according to number of pulses.
In one embodiment, as shown in figure 8, the invention also includes: with photoelectric conversion circuit, double Schmidt's type phase inverters connect
The voltage-stabilized power supply circuit connect.As shown in figure 9, voltage-stabilized power supply circuit includes: regulated power supply chip U1, capacitor C2, C3, C4, it is described
The V of voltage stabilizing chipINEnd connection power input, the end GND connect publicly, VOUTPower output end is connected, one end of capacitor C2 connects
Power input is connect, the other end connects publicly, and one end of capacitor C3 connects power output end, and the other end connects publicly, electricity
The one end for holding C4 connects power output end, and the other end connects publicly.
Regulated power supply chip U1 uses the TLV76033 of TI, and input voltage range can support that 5V~30V, output voltage are
Fixed 3.3V, maximum output load can arrive 100mA.Periphery only needs several ceramic condensers C2, C3, C4, can meet power supply
Demand.5V-24V input voltage VDD is reduced to a fixed lower voltage VCC (5V or less) by regulated power supply chip U1, should
VCC voltage can make photoelectric conversion circuit, double Schmidt's type phase inverters in subsequent conditioning circuit etc. can work normally.
Those skilled in the art can make various modifications to described specific embodiment
Or supplement or be substituted in a similar manner, however, it does not deviate from the spirit of the invention or surmounts the appended claims determines
The range of justice.
Claims (8)
1. a kind of pulse signal detection circuit applied to measuring instrument characterized by comprising
Input terminal connects double Schmidt's type phase inverters of pulse signal, for pulse signal to be converted to two pulse electricity of reverse phase
Ordinary mail number；
The phase-shift circuit being connect with double Schmidt's type phase inverters, the edge of two impulse level signal intensities for avoiding reverse phase
In the same time；
The push-pull output circuit being connect with phase-shift circuit；And
The processor being connect with push-pull output circuit, for output the examining to pulse signal according to push-pull output circuit
It surveys.
2. a kind of pulse signal detection circuit applied to measuring instrument according to claim 1, which is characterized in that described
The first input end of double Schmidt's type phase inverters connects pulse signal, the first output end connection of double Schmidt's type phase inverters
The second output terminal of second input terminal and phase-shift circuit, double Schmidt's type phase inverters connects phase-shift circuit.
3. a kind of pulse signal detection circuit applied to measuring instrument according to claim 2, which is characterized in that described
Phase-shift circuit includes: the first RC circuit, the 2nd RC circuit and double AND gate circuits, and the first input end of double AND gate circuits connects
The first output end of double Schmidt's type phase inverters is connect, the second input terminal of double AND gate circuits connects the output of the first RC circuit
End, the input terminal of the first RC circuit connect the first output end of double Schmidt's type phase inverters, and the of double AND gate circuits
Three input terminals connect the output end of the 2nd RC circuit, and the input terminal of the 2nd RC circuit connects the of double Schmidt's type phase inverters
Two output ends, the 4th input terminal of double AND gate circuits connect the second output terminal of double Schmidt's type phase inverters, it is described it is double with
The first output end and second output terminal of gate circuit are all connected with push-pull output circuit.
4. a kind of pulse signal detection circuit applied to measuring instrument according to claim 3, which is characterized in that described
First RC circuit includes: resistance R11 and capacitor C6, and the first of the double Schmidt's type phase inverters of one end connection of the resistance R11 is defeated
Outlet, the other end of the resistance R11 connect double second input terminals of AND gate circuit and one end of capacitor C6, the capacitor C6
The other end connection publicly.
5. a kind of pulse signal detection circuit applied to measuring instrument according to claim 3, which is characterized in that described
2nd RC circuit includes: resistance R12 and capacitor C9, and the second of the double Schmidt's type phase inverters of one end connection of the resistance R12 is defeated
Outlet, the other end of the resistance R11 connect double third input terminals of AND gate circuit and one end of capacitor C9, the capacitor C9
The other end connection publicly.
6. a kind of pulse signal detection circuit applied to measuring instrument according to claim 3, which is characterized in that described
Push-pull output circuit includes: resistance R1, R2, R3, R5, R7, R8, triode Q2, PMOS Q1 and NMOS Q3, the resistance R3
One end connect the first output end of double AND gate circuits, one end of the other end connection resistance R5 of the resistance R3 and triode
The base stage of Q2, publicly, the emitter of the triode Q2 connects publicly, three pole for the other end connection of the resistance R5
One end of the collector connection resistance R2 of pipe Q2, one end of the other end connection resistance R1 of the resistance R2 and PMOS Q1
Grid, the other end of the resistance R1 connect power input, and the source electrode of the PMOS Q1 connects power input, described
The drain connections of PMOS Q1 manage device；One end of the resistance R7 connects the second output terminal of double AND gate circuits, the resistance R7
The other end connection resistance R8 one end and NMOS Q3 grid, the resistance R8 the other end connection publicly, it is described
Publicly, the drain connections of the NMOS Q3 manage device for the source electrode connection of NMOS Q3.
7. a kind of pulse signal detection circuit applied to measuring instrument according to claim 6, which is characterized in that described
Push-pull output circuit further include: one end of fuse F2, diode D1, D2 and capacitor C1, the fuse F2 connect two poles
The anode of pipe D1, the cathode of diode D2, the drain electrode of PMOS Q1 and the drain electrode of NMOS Q3, the other end of the fuse F2
Connect processor, the anode connection of the diode D2 publicly, the cathode of diode D1 connection power input and
One end of capacitor C1, the other end connection of the capacitor C1 is publicly.
8. described in any item a kind of pulse signal detection circuits applied to measuring instrument according to claim 1~7, feature
It is, further includes: the voltage-stabilized power supply circuit being connect with double Schmidt's type phase inverters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910573018.3A CN110319894B (en) | 2019-06-28 | 2019-06-28 | Pulse signal detection circuit applied to metering instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910573018.3A CN110319894B (en) | 2019-06-28 | 2019-06-28 | Pulse signal detection circuit applied to metering instrument |
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| CN110319894B CN110319894B (en) | 2024-02-13 |
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| CN104198017A (en) * | 2014-07-30 | 2014-12-10 | 成都千嘉科技有限公司 | Pulse output signal processing system of flow metering device |
| CN105099144A (en) * | 2015-09-02 | 2015-11-25 | 江苏金工科技集团有限公司 | Controller with functions of low voltage electric power alternating power supply zero precision detection and phase shifting pulse generation |
| CN209978980U (en) * | 2019-06-28 | 2020-01-21 | 金卡智能集团股份有限公司 | Pulse signal detection circuit applied to metering instrument |
-
2019
- 2019-06-28 CN CN201910573018.3A patent/CN110319894B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5052230A (en) * | 1988-07-08 | 1991-10-01 | Flowtec Ag | Method and arrangement for flow rate measurement by means of ultrasonic waves |
| JPH06207955A (en) * | 1992-11-18 | 1994-07-26 | Mitsubishi Electric Corp | Pi/2 phase shift circuit, reactive energy meter and composite meter employing it |
| JPH09218069A (en) * | 1996-02-08 | 1997-08-19 | Toshiba Corp | City water meter |
| JPH11252962A (en) * | 1998-02-27 | 1999-09-17 | Sanyo Electric Co Ltd | Motor speed control circuit |
| US20090190650A1 (en) * | 2008-01-30 | 2009-07-30 | Huang Shih-Chung | Driving signal generation circuit |
| CN201282413Y (en) * | 2008-10-31 | 2009-07-29 | 天津市红日电气自动化有限公司 | Magnetic energy recovery switch phase shift complementation pulse generating circuit |
| CN104198017A (en) * | 2014-07-30 | 2014-12-10 | 成都千嘉科技有限公司 | Pulse output signal processing system of flow metering device |
| CN105099144A (en) * | 2015-09-02 | 2015-11-25 | 江苏金工科技集团有限公司 | Controller with functions of low voltage electric power alternating power supply zero precision detection and phase shifting pulse generation |
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| CN110319894B (en) | 2024-02-13 |
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