CN106208369B - A kind of on-line monitoring device of intelligent type low-voltage circuit breaker - Google Patents
A kind of on-line monitoring device of intelligent type low-voltage circuit breaker Download PDFInfo
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Abstract
The invention discloses a kind of on-line monitoring devices of intelligent type low-voltage circuit breaker, belong to the technical field of low-voltage circuit breaker control.Intelligent type low-voltage circuit breaker on-line monitoring device includes：Circuit, pwm signal filter circuit, voltage linear range conversion circuit, boosting power supply circuit, current conversion circuit, voltage conversion circuit occur for pwm signal isolation circuit, signal isolation power supply circuit, PWM buffering enhancings circuit, PWM high-precisions.Output by the Duty ratio control analog current/voltage for controlling pwm signal, has eliminated the influence that power-supply fluctuation is brought, and improve the load capacity of output signal, has simplified control circuit, reduced cost, compatible used equipment.
Description
Technical field
The present invention discloses a kind of on-line monitoring device of intelligent type low-voltage circuit breaker, belongs to the technology of low-voltage circuit breaker control
Field.
Background technology
In low-voltage distribution system, there is a large amount of electric loop, some of important circuits need real-tune TT ＆ C so as to
Failure can search processing in time after occurring.At present generally using " forth generation " low-voltage circuit breaker, it has the work(such as measure, control
Can, but it is of high cost, user is beyond affordability.Monitoring device utilizes its I/O (On-off signal and output) module, RS-485 communication moulds
Block coordinates with breaker and realizes " telemetering, remote signalling, remote control " function, so as to fulfill the intelligent control of electric loop.
The structure of existing intelligent breaker monitoring device is more complicated, needs dual power supply, and job insecurity, by
Power supply is affected, and easily controller is interfered, and output accuracy is not high, and the carrying load ability of output signal is insufficient, and cost
Higher, user is difficult to receive.
The structure of existing intelligent breaker monitoring device is more complicated, and most of by the way of digital communication,
Seldom disclose the automatic low pressure with remote monitoring function using analog quantity communication mode, such as CN201410704884.9 and break
Road device control device realizes remote monitoring using GMS 3G 4G, can not just work in the place of no signal covering, Wu Fajian
Hold used equipment, job stability is influenced greatly by power supply, and cost is higher, and user is difficult to receive.
Invention content
The technical problems to be solved by the invention are the deficiencies for above-mentioned background technology, provide a kind of intelligent type low-voltage
The on-line monitoring device of breaker controls the electric current output of 4-20mA or the voltage output of 0-10V by PWM, solves existing
Intelligent breaker monitoring device is of high cost, precision is low, can not be compatible with used equipment, job stability is influenced big, output by power supply and believed
The technical issues of number load capacity is insufficient.
The present invention adopts the following technical scheme that for achieving the above object：
A kind of on-line monitoring device of intelligent type low-voltage circuit breaker, including：
Signal conversion module, input terminal is with detecting the AC voltage sensor of three-phase voltage, detecting exchanging for three-phase current
The I/O ports of current sensor, the direct current voltage sensor connection for detecting storage capacitor voltage, output terminal and controller connect,
For three-phase voltage signal, three-phase current signal, storage capacitor voltage signal to be converted to digital signal；
Controller for receiving the digital signal of signal conversion module output, while converts digital signals into PWM letters
Number, the digital signal received is uploaded to host computer by fieldbus；
The I/O ports connection of pwm signal isolation circuit, input terminal and controller, output terminal and pwm signal buffering enhancing electricity
The input terminal connection on road, power port connect the output signal of power supply signal and signal isolation power supply circuit, are controlled for being isolated
Electric signal between device and pwm signal buffering enhancing circuit；
Signal isolation power supply circuit, input termination power supply signal, for powering to pwm signal isolation circuit；
Pwm signal buffering enhancing circuit, output terminal are connect with the input terminal of pwm signal filter circuit, and power port connects electricity
The output signal of circuit occurs for source signal and PWM high-precisions, for exporting the pwm signal of enhancing；
Circuit occurs for PWM high-precisions, and input termination power supply signal is high-precision for being provided to pwm signal buffering enhancing circuit
Spend power supply；
Pwm signal filter circuit, output terminal are connect with the input terminal of voltage linear range conversion circuit, for what will be enhanced
Pwm signal is converted to steady dc voltage signal；
The input terminal connection of voltage linear range conversion circuit, output terminal and current conversion circuit, power port and boosting
The output terminal connection of power supply circuit, for reducing d. c. voltage signal range；
Boost power supply circuit, the output signal of input termination power supply signal and signal isolation power supply circuit, for electricity
Press the power supply of range of linearity conversion circuit；
Current conversion circuit, input terminal are connect with the output terminal of voltage linear range conversion circuit, output terminal and host computer
Data port connects, and the d. c. voltage signal for voltage linear range conversion circuit to be exported is converted to analog current signal；
The output terminal connection of voltage conversion circuit, input terminal and current conversion circuit, output terminal and host computer data port
Connection, for the analog current signal that current conversion circuit exports to be converted to analog voltage signal；
Host computer, for receiving the mould of the analog current signal of current conversion circuit output and voltage conversion circuit output
Intend voltage signal.
Scheme is advanced optimized as the intelligent type low-voltage circuit breaker on-line monitoring device,
Signal isolation power supply circuit, including：First capacitance, the second capacitance and, to power supply output DC voltage drop
The first power supply chip of processing is pressed, wherein,
First power supply chip input terminal is connect as the input terminal of isolation power supply circuit with power supply, a pole of the first capacitance,
Input terminal of the anode of second capacitance with the first power supply chip is connect, the ground terminal of the first power supply chip, the first capacitance it is another
One pole is grounded jointly with power supply, and the cathode of the second capacitance is connect with the output terminal of the first power supply chip, the output of the first power supply chip
It holds and is connect as the output terminal of signal isolation power supply circuit with the power port of pwm signal isolation circuit.
As the further prioritization scheme of the intelligent type low-voltage circuit breaker on-line monitoring device,
Boost power supply circuit, including：First diode, the second diode, the 4th capacitance, the 5th capacitance, the 6th capacitance,
And the second source chip of boosting processing is carried out to the voltage signal of power supply output, wherein,
The anode of first diode, the positive pole end of second source chip connect power supply, the first diode cathode,
Four capacitance cathodes, the second diode anode are connected, the cathode of the 4th capacitance and the positive port of external capacitor of second source chip
Connection, the second diode cathode and the 5th capacitance cathode, one pole of the 6th capacitance and the output terminal after connecing as the power supply circuit that boosts,
5th capacitance cathode, second source chip output, second source chip power negative polarity end with signal isolation power supply circuit
Output terminal connection, another pole of the 6th capacitance is grounded jointly with power supply, the positive pole end of second source chip and power supply
Negative polarity end forms the input terminal of boosting power supply circuit.
Further, in the intelligent type low-voltage circuit breaker on-line monitoring device,
Voltage linear range conversion circuit, including：4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the tenth electricity
Resistance, the 11st resistance, the first operational amplifier, the 7th capacitance, wherein, the 4th resistance one end, one pole of the 7th capacitance, the 11st electricity
Resistance one end is connect with power supply, and the 4th resistance other end, the 5th resistance one end, the 6th resistance one end are connected, and the 5th resistance is another
One end is connect with the first operational amplifier inverting input, and another pole of the 7th capacitance, the 7th resistance one end are put with the first operation
Big device in-phase input end connection, the 6th resistance other end, the tenth resistance one end are connect with the first operational amplifier output terminal, the
Output terminal as voltage linear range conversion circuit after the ten resistance other ends are connect with the 11st resistance other end, the 7th resistance
The other end and the first operational amplifier output terminal form the input terminal of voltage linear range conversion circuit, the first operational amplifier
Power end is connect as the power port of voltage linear range conversion circuit with boosting power supply circuit output terminal, the first operation amplifier
Device ground terminal is grounded jointly with input voltage source；
Pwm signal filter circuit, including：8th resistance, the 9th resistance, the 8th capacitance, the 9th capacitance, wherein, the 9th electricity
Resistance one end buffers enhancing circuit output end with pwm signal as pwm signal filter circuit input terminal and connect, and the 9th resistance is another
End, one pole of the 9th capacitance, the 8th resistance one end are connected, the 8th resistance other end, the connection of one pole of the 8th capacitance, and the 8th capacitance is another
The tie point of the tie point of another pole connection of one pole, the 9th capacitance, the 8th resistance and the 8th capacitance, the 8th capacitance and the 9th capacitance
Form the output terminal of pwm signal filter circuit.
Further, in the intelligent type low-voltage circuit breaker on-line monitoring device,
Current conversion circuit, including：Second operational amplifier, the 12nd resistance, the 13rd resistance, the 14th resistance,
Ten capacitances, the 11st capacitance, the first field-effect tube, wherein,
Second operational amplifier inverting input is as current conversion circuit input terminal and voltage linear range conversion circuit
Output terminal connects, and one pole of the tenth capacitance is connect with second operational amplifier inverting input, second operational amplifier homophase input
End is connect with the 12nd resistance one end, and second operational amplifier output terminal, another pole of the tenth capacitance, the 13rd resistance one end are connected
It connects, the 12nd resistance other end, the 14th resistance one end, the first FET drain are connected, the 14th another termination of resistance
Power supply, the 13rd resistance the first fet gate of another termination, the first field-effect tube source electrode connect one pole of the 11st capacitance, and the tenth
Another pole of one capacitance is grounded jointly with power supply, and the two-stage of the 11st capacitance forms current conversion circuit output terminal.
Further, in the intelligent type low-voltage circuit breaker on-line monitoring device,
Voltage conversion circuit, including：Signal switched terminal and the 15th resistance, wherein,
Signal switched terminal one end is connect with the first field-effect tube source electrode, the signal switched terminal other end and the 15th resistance
One end connects, and the 15th resistance other end is grounded jointly with power supply.
Further, in the intelligent type low-voltage circuit breaker on-line monitoring device,
Pwm signal isolation circuit, including：First optocoupler, first resistor, second resistance, wherein,
First resistor one end receives the pwm signal of controller output, the first electricity as the input terminal of pwm signal isolation circuit
The resistance other end is connect with the first optocoupler primary side positive polarity input terminal, the first optocoupler primary side negative polarity input termination controller
Power supply, second resistance one end, the first optocoupler secondary side positive polarity input terminal are connect with power supply, the first optocoupler secondary side cathode
Property input terminal is connect with the first power supply chip output terminal, and the second resistance other end is connect with the first optocoupler output, the first optocoupler
The input terminal that output terminal buffers enhancing circuit as pwm signal isolation circuit output terminal with pwm signal is connect, and the two of the first optocoupler
Secondary side positive polarity input terminal and secondary side negative polarity input terminal form the power port of pwm signal isolation circuit.
Further, in the intelligent type low-voltage circuit breaker on-line monitoring device,
Pwm signal buffering enhancing circuit, including：First three state buffer, third capacitance, wherein, the first three state buffer
Input terminal buffers enhancing circuit input end as pwm signal and is connect with pwm signal isolation circuit output terminal, the first three state buffer
Enable Pin, the first three state buffer positive pole port, third capacitance one are extremely connect with power supply, another pole of third capacitance with
First three state buffer power cathode port connects, the positive pole port of the first three state buffer and power cathode end
Mouth forms the power port of pwm signal buffering enhancing circuit, and the first three state buffer output terminal is buffered as pwm signal enhances electricity
The output terminal on road is connect with the input terminal of pwm signal filter circuit；
Circuit occurs for PWM high-precisions, including：First voltage-stabiliser tube and 3rd resistor, wherein, the first regulator tube negative conduct
PWM high-precisions occur circuit input end and are connect with power supply, and the first voltage-stabiliser tube anode and 3rd resistor one end are simultaneously used as PWM high after connecing
The output terminal that circuit occurs for precision is connected with the power cathode port of the first three state buffer, the 3rd resistor other end and electricity
Source is grounded jointly.
The present invention is had the advantages that using above-mentioned technical proposal：
(1) it proposes and a kind of High-Accuracy PWM signal is converted into the online of the electric current of 4-20mA or the voltage output of 0-10V
The device of monitoring intelligent type low-voltage circuit breaker.
(2) PWM high-precisions occur to keep stable voltage between circuit causes PWM bufferings to enhance circuit power positive and negative anodes
Difference so that the pwm signal that pwm signal buffering enhancing circuit output is stablized, voltage linear range conversion circuit generate pwm signal
Analog voltage range linear narrowing, the analog voltage signal that current conversion circuit exports voltage linear range conversion circuit turn
The electric current of 4-20mA is changed to, the precision of entire monitoring device output signal can reach the precision of 16 digit mode converters.
(3) design of signal isolation power supply circuit, PWM high-precision generation circuit, the power supply circuit that boosts realizes entire prison
The single supply power supply of device is controlled, compared with traditional dual power supply system, simplifies Power Management Design.
(4) monitoring device of the present invention is by resistance, capacitance, operational amplifier, optocoupler, diode, power supply chip, field
The function module composition of effect pipe, three state buffer composition, simplifies control circuit, reduces cost, compatible used equipment.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
It obtains significantly or is recognized by the practice of the present invention.
Description of the drawings
Fig. 1 is by pwm signal isolation circuit, signal isolation power supply circuit, pwm signal buffering enhancing circuit, PWM high-precisions
The module map of the signal isolation circuit of circuit composition occurs.
Fig. 2 is by voltage linear range conversion circuit, boosting power supply circuit, pwm signal filter circuit, current transformation electricity
The PWM that road, voltage conversion circuit form turns the module map of analogue quantity output circuit.
Fig. 3 is the system block diagram of intelligent type low-voltage short-circuiting device on-line monitoring device.
Figure label explanation：P1 is power input terminal, and device signal input terminal, P3 are output signal type to P2 in order to control
Switched terminal, P4 are analog signal output, and R1 to R15 is the first to the 15th resistance, and C1 to C11 is first to the 11st
Capacitance, D1, D2 are first, second diode, and VD1 is the first zener diode, and O1 is the first optocoupler, and U1 is the first power supply core
Piece, T1 be the first three state buffer, U2 be second source chip, OPA, OPB be first, second operational amplifier, Q1 first
Field-effect tube.
Specific embodiment
The technical solution of invention is described in detail below in conjunction with the accompanying drawings.Those skilled in the art of the present technique should can manage
Solution claims element to be " connected " or during " coupled " to another element when us, it can be directly connected or coupled to other elements or
There may also be intermediary elements by person.In addition, " connection " used herein or " coupling " can include wireless connection or coupling.Here
The wording "and/or" used includes any cell of one or more associated list items and all combines.
The block diagram of the on-line monitoring device of intelligent type low-voltage circuit breaker as shown in figure 3, including：Signal conversion module, control
Device, host computer, pwm signal isolation circuit, signal isolation power supply circuit, pwm signal buffering enhancing circuit, PWM high-precisions occur
Circuit, pwm signal filter circuit, voltage linear range conversion circuit, boosting power supply circuit, current conversion circuit, voltage transformation
Circuit.Signal receiving end of signal conversion module and AC voltage sensor, the detection three-phase current with detecting three-phase voltage
AC current sensor, detect storage capacitor voltage direct current voltage sensor connection, signal isolation power supply circuit output terminal
It is connect with pwm signal isolation circuit power port, pwm signal isolation circuit output terminal and pwm signal buffering enhancing circuit input
End connection, PWM high-precisions occur circuit output end and are connect with pwm signal buffering enhancing circuit power port, and pwm signal buffering increases
Strong circuit output end is connect with pwm signal filter circuit input terminal, and pwm signal filter circuit output terminal turns with voltage linear range
Circuit input end connection is changed, boosting power supply circuit output terminal is connect with voltage linear range conversion circuit power port, pressure-wire
Property range conversion circuit output termination current conversion circuit input terminal, current conversion circuit output terminal connects with host computer data port
It connects, current conversion circuit output termination voltage conversion circuit input terminal, voltage transformation signal output end connects with host computer data terminal
It connects.Extraneous three-phase voltage signal, three-phase current signal and storage capacitor voltage signal are switched to digital quantity by signal conversion module
And it is transmitted to controller.Controller uploads the data received to host computer by two paths：First, it will be digital by fieldbus
Amount is directly transmitted to host computer；Second, the digital quantity signal of input is switched to pwm signal and passes through subsequent PWM to control by controller
Digital quantity is switched to circuit standard 4-20mA current signals or 0-10V voltage signals are transmitted to host computer.
Pwm signal isolation circuit includes as shown in Figure 1：Controller signals input terminal P2, the first optocoupler O1, first resistor
R1, second resistance R2.Controller signals input terminal P2 one end (No. 2 terminals) and first resistor R1 one end (as pwm signal every
Input terminal from circuit) connection, the first resistor R1 other ends and the first optocoupler O1 primary side positive polaritys input terminal (No. 2 terminals) are even
It connects, the first optocoupler O1 primary side negative polarity input terminal (No. 3 terminals) and the controller signals input terminal P2 other ends (No. 1 terminal)
Connection, second resistance R2 one end and the first optocoupler O1 secondary side positive polaritys input terminal (No. 8 terminals) simultaneously connect rear and input voltage source
VCC1 connections, the second resistance R2 other ends are connect with the first optocoupler O1 output terminals (No. 6 terminals), the first optocoupler O1 output terminals (No. 6
Terminal) as pwm signal isolation circuit output terminal and pwm signal buffer enhancing circuit input terminal connect.First optocoupler O1
Secondary side positive polarity input terminal (No. 8 terminals) and secondary side negative polarity input terminal (No. 5 terminals) form pwm signal isolation circuit
Power port is powered by signal isolation power supply circuit.First resistor R1 is current-limiting resistance, and second resistance R2 is pull-up resistor.The
One optocoupler O1 is used to the pwm signal inputted being isolated, to ensure the safety of controller, the model EL6N137 of the first optocoupler, control
No. 2 terminals of device signal input terminal P2 processed receive the pwm signal of controller output, and pwm signal high level voltage is 3.3V, low
Level voltage is 0V, and No. 1 terminal of controller signals input terminal P2 is with connecing controller power source.When controller signals input terminal
When No. 2 terminals of P2 connect anode, No. 1 terminal connects cathode, the first optocoupler primary side conducting, secondary side is also connected therewith.First light
The secondary side positive polarity input terminal and secondary side negative polarity input terminal of coupling form the power port of pwm signal isolation circuit.
Signal isolation power supply circuit includes as shown in Figure 1：Power input terminal P1, the first capacitance C1, the second capacitance C2,
One power supply chip U1.First power supply chip U1 input terminals (No. 1 terminal) are defeated as signal isolation power supply circuit input terminal and power supply
Enter 1 anode of terminals P (No. 2 terminals) connection, power input terminal P1 anodes (No. 2 terminals) connect the first capacitances of input voltage source VCC1
Mono- poles of C1, the second capacitance C2 anodes connect power input terminal P1 anodes (No. 2 terminals), power input terminal P1 cathode (No. 1 end
Son), the first power supply chip U1 ground terminals (No. 2 terminals), the first capacitance C1 is another is extremely grounded jointly with input voltage source VCC1,
First power supply chip U1 output terminals (No. 3 terminals) are as signal isolation power supply circuit output terminal and the first optocoupler O1 secondary side cathode
Property input terminal (No. 5 terminals) connect, the second capacitance C2 cathode connect with the first power supply chip U1 output terminals (No. 3 terminals).Signal
Isolation power supply circuit provides power supply, the model CJ79L05 of the first power supply chip U1, power input terminal P1 for the first optocoupler O1
24V direct currents are accessed, 24V direct currents are switched to by 19V (being VCC2) direct current by the first power supply chip U1, then the first optocoupler
The cathode voltage of O1 secondary sides is 24V, and the first optocoupler O1 secondary sides cathode voltage is 19V, so the PWM of the first optocoupler O1 outputs
Signal high level is 24V, low level 19V.
Pwm signal buffering enhancing circuit includes as shown in Figure 1：First three state buffer T1, third capacitance C3.First tri-state
The input terminal (No. 2 terminals) of buffer T1 buffers enhancing circuit input end and pwm signal isolation circuit output terminal as pwm signal
Connection, the Enable Pin (No. 1 terminal) of the first three state buffer T1, mono- poles of third capacitance C3, the first three state buffer T1 power supply
Positive polarity port (No. 14 terminals) is connected with power input terminal P1 anodes (No. 2 terminals), another poles of third capacitance C3, first
The power cathode port (No. 7 terminals) of three state buffer T1 occurs circuit output end with pwm signal high-precision and connect, and the one or three
The output terminal (No. 3 terminals) of state buffer T1 buffers the output terminal for enhancing circuit as pwm signal and pwm signal filter circuit is defeated
Enter end connection, the positive pole port of the first three state buffer and power cathode port form pwm signal buffering enhancing electricity
The power port on road.The output voltage of first three state buffer T1 models 74HC126, the first three state buffer T1 is powered by it
Voltage determines, that is, the voltage that circuit offer occurs by PWM high-precisions determines.
PWM high-precisions occur circuit and include as shown in Figure 1：First voltage-stabiliser tube VD1 and 3rd resistor R3.First voltage-stabiliser tube
As pwm signal high-precision circuit input end and power input terminal P1 anodes (No. 2 terminals) occur for VD1 cathode (No. 2 terminals)
Simultaneously as pwm signal high-precision circuit occurs for connection, the first voltage-stabiliser tube VD1 anodes (No. 1 terminal), 3rd resistor R3 one end after connecing
Output terminal be connected with the first three state buffer T1 power cathodes port (No. 7 terminals), the 3rd resistor R3 other ends with electricity
Source input terminal P1 cathode (No. 1 terminal) connect.First voltage-stabiliser tube VD1 is 5V high-precision voltage stabilizing pipes, is the first three state buffer
T1 provides stable high-precision 5V stabilized power sources, and the voltage for making the first three state buffer T1 cathode is (VCC1-5) V, that is, makes the
The PWM low and high level differences of one three state buffer T1 outputs remain at 5V, eliminate the interference of power-supply fluctuation, ensure that entire
The output accuracy of system.
Pwm signal filter circuit includes as shown in Figure 2：8th resistance R8, the 9th resistance R9, the electricity of the 8th capacitance C8 and the 9th
Hold C9.9th resistance C9 one end is as pwm signal filter circuit input terminal and the first three state buffer T1 output terminals (No. 3 terminals)
Connection, the 9th resistance R9 other ends, mono- poles of the 9th capacitance C9, the 8th resistance R8 one end be connected, mono- poles of the 8th capacitance C8 and the
The eight resistance R8 other ends connect, and another poles of the 8th capacitance C8, another poles of the 9th capacitance C9 and voltage linear range conversion circuit are defeated
Outlet connects, and the tie point of the 8th resistance and the 8th capacitance, the tie point composition pwm signal of the 8th capacitance and the 9th capacitance filter
The output terminal of circuit.9th capacitance C9 and the 9th resistance R9 composition level-one filter circuits, the 8th capacitance C8 and the 8th resistance R8 groups
Into two level RC filter circuits, pwm signal is switched into steady dc voltage signal.
Voltage linear range conversion circuit includes as shown in Figure 2：4th resistance R4, the 5th resistance R5, the 6th resistance R6,
Seven resistance R7, the tenth resistance R10, the 11st resistance R11, the first operational amplifier OPA, the 7th capacitance C7.4th resistance R4 mono-
End, the 7th capacitance C7 mono- are extremely connect with power input terminal P1 anodes (No. 2 terminals), the 4th resistance R4 other ends, the 5th electricity
Resistance R5 one end, the 6th resistance R6 one end are connected, the 5th resistance R5 other ends and the first operational amplifier OPA inverting inputs (2
Number terminal) connection, another poles of the 7th capacitance C7, the 7th resistance R7 one end with the first operational amplifier OPA in-phase input ends (3
Number terminal) connection, the 7th resistance R7 other ends are connected with the tie point of the 8th capacitance C8 and the 8th resistance R8, and the 7th resistance is another
End forms the input terminal of voltage linear range conversion circuit, the 6th resistance R6 other ends, the with the first operational amplifier output terminal
Ten resistance R10 one end are connect, the tenth resistance R10 other ends and the tenth with the first operational amplifier OPA output terminals (No. 1 terminal)
One resistance R11 one end is simultaneously connect after connecing, as voltage linear range conversion circuit output terminal with current conversion circuit input terminal
The 11 resistance R11 other ends are connect with power input terminal P1 anodes (No. 2 terminals), the first operational amplifier OPA power cathodes
Property port (No. 4 terminals) is connect with power input terminal P1 cathode (No. 1 terminal), the first operational amplifier OPA positive poles
Port (No. 8 terminals) is connect as the power port of voltage linear range conversion circuit with boosting power supply circuit output terminal, and first
Operational amplifier OPA models LT1013.The DC voltage that voltage linear range conversion circuit exports pwm signal filter circuit
Range of signal is output to the input terminal of current converter circuit after reducing.Pwm signal filter circuit input pwm signal high level be
24V, low level 19V, the DC voltage size exported using Duty ratio control PWM filter circuits, so filtered circuit
Afterwards, the analog voltage obtained is between 19-24V, and the 11st resistance R11 and the 12nd resistance R10 is by the range of analog voltage
It is converted, R11=100K, R10=150K, then the output voltage of voltage range conversion circuit is：Vout=(VCC1-Vin) *
R12/ (R11+R12), such as：When duty ratio is 0%, the analog voltage of input is 19V, then second operational amplifier OPB's is defeated
Enter voltage for 22V, when duty ratio is 100%, the analog voltage of input is the input of 24V, the then OPB of second operational amplifier
Voltage is 24V.
Boosting power supply circuit includes as shown in Figure 2：First diode D1, the second diode D2, second source chip U2,
Four capacitance C4, the 5th capacitance C5, the 6th capacitance C6.The positive pole end of first diode D1 anodes, second source chip U2
(No. 8 terminals) is connect with power input terminal P1 anodes (No. 2 terminals), the power cathode end of second source chip U2 (No. 3
Terminal), second source chip U2 output terminals (No. 5 terminals), the 5th capacitance C5 cathode with the first power supply chip U1 output terminals (3
Number terminal) connection, the first diode D1 cathodes, the second diode D2 anodes, the 4th capacitance C4 anodes be connected, the 4th capacitance C4
Cathode is connect with the positive port of external capacitor (No. 2 terminals) of second source chip U2, the second diode D2 cathodes, the 5th capacitance C5
Anode, mono- poles of the 6th capacitance C6 and the output terminal after connecing as boosting power supply circuit, another poles of the 6th capacitance C6 and power input
1 cathode of terminals P (No. 1 terminal) connects, and the positive pole end of second source chip and power cathode end form boosting power supply
The input terminal of circuit.Model TP7660 selected by second source chip U2, after boosting power supply circuit promotes input voltage signal
The positive pole end (No. 8 terminals) of the first operational amplifier OPA is output to from the second diode D2 cathode, works as VCC1=24V
When, the voltage obtained after boosted voltage is 28V, is used for operational amplifier.
Current conversion circuit includes as shown in Figure 2：Second operational amplifier OPB, the 12nd resistance R12, the 13rd resistance
R13, the 14th resistance R14, the tenth capacitance C10, the 11st capacitance C11, the first field-effect tube Q1, analog signal output
P4.Second operational amplifier OPB inverting inputs (No. 6 terminals) turn as current conversion circuit input terminal and voltage linear range
Circuit output end connection is changed, mono- poles of the tenth capacitance C10 are connect with second operational amplifier OPB inverting inputs (No. 6 terminals), the
Another poles of ten capacitance C10, second operational amplifier OPB output terminals (No. 7 terminals), the 13rd resistance R13 one end are connected, and the tenth
Two resistance R12 one end are connect with second operational amplifier OPB in-phase input ends (No. 5 terminals), the 12nd resistance R12 other ends,
14th resistance R14 one end, the first field-effect tube Q1 drain electrodes (No. 2 terminals) are connected, the 14th resistance R14 other ends and power supply
Input terminal P1 anodes (No. 2 terminals) connect, the 13rd resistance R13 other ends and the first field-effect tube Q1 grids (No. 1 terminal)
Connection, the first field-effect tube Q1 source electrodes (No. 3 terminals), mono- poles of the 11st capacitance C11, sub- P4 one end of analog signal output (No. 1
Terminal) it is connected, another poles of the 11st capacitance C11, the sub- P4 other ends of analog signal output (No. 2 terminals) and power input
Sub- P1 cathode (No. 1 terminal) are connected, and the two-stage of the 11st capacitance forms current conversion circuit output terminal.First field-effect tube Q1
As expanding used in stream, model IRF530N selected by field-effect tube, the sub- P4 output 4-20mA analog currents of analog signal output are believed
Number.
Pwm signal filter circuit, voltage linear range conversion circuit, boosting power supply circuit, the common work of current conversion circuit
Make pwm signal switching to current signal, input supply voltage VCC, the pwm signal level exported from the first three state buffer
Upwm, output current IoutAs shown in formula (1),
By buffering enhancing circuit analysis, U during high level to pwm signalpwmEqual to VCC, U during low levelpwmEqual to VCC-
5, the output of the Duty ratio control electric current by controlling pwm signal, the influence that the power-supply fluctuation of cancellation is brought.
Voltage conversion circuit includes as shown in Figure 2：Signal type switched terminal P3 and the 15th resistance R15.Signal type
Switched terminal P3 one end (No. 2 terminals) is connect with the first field-effect tube Q1 source electrodes (No. 3 terminals), and signal type switched terminal P3 is another
One end (No. 1 terminal) is connect with the 15th resistance R15 one end, the 15th resistance R15 other ends and power input terminal P1 cathode
(No. 1 terminal) connects, and when signal type switched terminal P2 short circuits, then electric current generates pressure drop, system by the 15th resistance R15
0-10V analog voltage signals are exported, analog voltage signal is equal to the resistance value that current signal is multiplied by the 15th resistance R15.
In conclusion the invention has the advantages that：
(1) it proposes and a kind of High-Accuracy PWM signal is converted into the online of the electric current of 4-20mA or the voltage output of 0-10V
The device of monitoring intelligent type low-voltage circuit breaker.
(2) PWM high-precisions occur to keep stable voltage between circuit causes PWM bufferings to enhance circuit power positive and negative anodes
Difference so that the pwm signal that pwm signal buffering enhancing circuit output is stablized, voltage linear range conversion circuit generate pwm signal
Analog voltage range linear narrowing, the analog voltage signal that current conversion circuit exports voltage linear range conversion circuit turn
The electric current of 4-20mA is changed to, the precision of entire monitoring device output signal can reach the precision of 16 digit mode converters.
(3) design of signal isolation power supply circuit, PWM high-precision generation circuit, the power supply circuit that boosts realizes entire prison
The single supply power supply of device is controlled, compared with traditional dual power supply system, simplifies Power Management Design.
(4) monitoring device of the present invention is by resistance, capacitance, operational amplifier, optocoupler, diode, power supply chip, field
The function module composition of effect pipe, three state buffer composition, simplifies control circuit, reduces cost, compatible used equipment.
Claims (8)
1. a kind of on-line monitoring device of intelligent type low-voltage circuit breaker, which is characterized in that including：
Signal conversion module, input terminal and the AC voltage sensor of detection three-phase voltage, the alternating current of detection three-phase current
The I/O ports of sensor, the direct current voltage sensor connection for detecting storage capacitor voltage, output terminal and controller connect, and are used for
Three-phase voltage signal, three-phase current signal, storage capacitor voltage signal are converted into digital signal；
Controller for receiving the digital signal of signal conversion module output, while converts digital signals into pwm signal, leads to
It crosses fieldbus and uploads the digital signal received to host computer；
The I/O ports connection of pwm signal isolation circuit, input terminal and controller, output terminal and pwm signal buffering enhancing circuit
Input terminal connects, and power port connects the output signal of power supply signal and signal isolation power supply circuit, for isolation controller and
Electric signal between pwm signal buffering enhancing circuit；
Signal isolation power supply circuit, input termination power supply signal, for powering to pwm signal isolation circuit；
Pwm signal buffering enhancing circuit, output terminal are connect with the input terminal of pwm signal filter circuit, and power port connects power supply letter
Number and PWM high-precision occur circuit output signal, for export enhancing pwm signal；
Circuit occurs for PWM high-precisions, and input termination power supply signal provides high precision electro for buffering enhancing circuit to pwm signal
Source；
Pwm signal filter circuit, output terminal are connect with the input terminal of voltage linear range conversion circuit, for by the PWM enhanced
Signal is converted to steady dc voltage signal；
The input terminal connection of voltage linear range conversion circuit, output terminal and current conversion circuit, power port are powered with boosting
The output terminal connection of circuit, for reducing d. c. voltage signal range；
Boost power supply circuit, the output signal of input termination power supply signal and signal isolation power supply circuit, for pressure-wire
Property the power supply of range conversion circuit；
Current conversion circuit, input terminal are connect with the output terminal of voltage linear range conversion circuit, output terminal and host computer data
Port connects, and the d. c. voltage signal for voltage linear range conversion circuit to be exported is converted to analog current signal；
The output terminal connection of voltage conversion circuit, input terminal and current conversion circuit, output terminal are connect with host computer data port,
For the analog current signal that current conversion circuit exports to be converted to analog voltage signal；
Host computer, for receiving the simulation electricity of the analog current signal of current conversion circuit output and voltage conversion circuit output
Press signal.
2. a kind of on-line monitoring device of intelligent type low-voltage circuit breaker according to claim 1, which is characterized in that
The signal isolation power supply circuit, including：First capacitance, the second capacitance and, to power supply output DC voltage drop
The first power supply chip of processing is pressed, wherein,
The first power supply chip input terminal is connect as the input terminal of isolation power supply circuit with power supply, a pole of the first capacitance,
Input terminal of the anode of second capacitance with the first power supply chip is connect, the ground terminal of the first power supply chip, the first capacitance it is another
One pole is grounded jointly with power supply, and the cathode of the second capacitance is connect with the output terminal of the first power supply chip, the output of the first power supply chip
It holds and is connect as the output terminal of signal isolation power supply circuit with the power port of pwm signal isolation circuit.
3. a kind of on-line monitoring device of intelligent type low-voltage circuit breaker according to claim 2, which is characterized in that
The boosting power supply circuit, including：First diode, the second diode, the 4th capacitance, the 5th capacitance, the 6th capacitance,
And the second source chip of boosting processing is carried out to the voltage signal of power supply output, wherein,
The anode of first diode, the positive pole end of second source chip connect power supply, the first diode cathode,
Four capacitance cathodes, the second diode anode are connected, the cathode of the 4th capacitance and the positive port of external capacitor of second source chip
Connection, the second diode cathode and the 5th capacitance cathode, one pole of the 6th capacitance and the output terminal after connecing as the power supply circuit that boosts,
5th capacitance cathode, second source chip output, second source chip power negative polarity end with signal isolation power supply circuit
Output terminal connection, another pole of the 6th capacitance is grounded jointly with power supply, the positive pole end of second source chip and power supply
Negative polarity end forms the input terminal of boosting power supply circuit.
4. a kind of on-line monitoring device of intelligent type low-voltage circuit breaker according to claim 3, which is characterized in that
The voltage linear range conversion circuit, including：4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the tenth electricity
Resistance, the 11st resistance, the first operational amplifier, the 7th capacitance, wherein, the 4th resistance one end, one pole of the 7th capacitance, the 11st electricity
Resistance one end is connect with power supply, and the 4th resistance other end, the 5th resistance one end, the 6th resistance one end are connected, and the 5th resistance is another
One end is connect with the first operational amplifier inverting input, and another pole of the 7th capacitance, the 7th resistance one end are put with the first operation
Big device in-phase input end connection, the 6th resistance other end, the tenth resistance one end are connect with the first operational amplifier output terminal, the
Output terminal as voltage linear range conversion circuit after the ten resistance other ends are connect with the 11st resistance other end, the 7th resistance
The other end and the first operational amplifier output terminal form the input terminal of voltage linear range conversion circuit, the first operational amplifier
Power end is connect as the power port of voltage linear range conversion circuit with boosting power supply circuit output terminal, the first operation amplifier
Device ground terminal is grounded jointly with input voltage source；
The pwm signal filter circuit, including：8th resistance, the 9th resistance, the 8th capacitance, the 9th capacitance, wherein, the 9th electricity
Resistance one end buffers enhancing circuit output end with pwm signal as pwm signal filter circuit input terminal and connect, and the 9th resistance is another
End, one pole of the 9th capacitance, the 8th resistance one end are connected, the 8th resistance other end, the connection of one pole of the 8th capacitance, and the 8th capacitance is another
The tie point of the tie point of another pole connection of one pole, the 9th capacitance, the 8th resistance and the 8th capacitance, the 8th capacitance and the 9th capacitance
Form the output terminal of pwm signal filter circuit.
5. a kind of on-line monitoring device of intelligent type low-voltage circuit breaker according to claim 4, which is characterized in that
The current conversion circuit, including：Second operational amplifier, the 12nd resistance, the 13rd resistance, the 14th resistance,
Ten capacitances, the 11st capacitance, the first field-effect tube, wherein,
The second operational amplifier inverting input is as current conversion circuit input terminal and voltage linear range conversion circuit
Output terminal connects, and one pole of the tenth capacitance is connect with second operational amplifier inverting input, second operational amplifier homophase input
End is connect with the 12nd resistance one end, and second operational amplifier output terminal, another pole of the tenth capacitance, the 13rd resistance one end are connected
It connects, the 12nd resistance other end, the 14th resistance one end, the first FET drain are connected, the 14th another termination of resistance
Power supply, the 13rd resistance the first fet gate of another termination, the first field-effect tube source electrode connect one pole of the 11st capacitance, and the tenth
Another pole of one capacitance is grounded jointly with power supply, and the two-stage of the 11st capacitance forms current conversion circuit output terminal.
6. a kind of on-line monitoring device of intelligent type low-voltage circuit breaker according to claim 5, which is characterized in that
The voltage conversion circuit, including：Signal switched terminal and the 15th resistance, wherein,
Described signal switched terminal one end is connect with the first field-effect tube source electrode, the signal switched terminal other end and the 15th resistance
One end connects, and the 15th resistance other end is grounded jointly with power supply.
7. a kind of on-line monitoring device of intelligent type low-voltage circuit breaker according to claim 2, which is characterized in that
The pwm signal isolation circuit, including：First optocoupler, first resistor, second resistance, wherein,
Described first resistor one end receives the pwm signal of controller output, the first electricity as the input terminal of pwm signal isolation circuit
The resistance other end is connect with the first optocoupler primary side positive polarity input terminal, the first optocoupler primary side negative polarity input termination controller
Power supply, second resistance one end, the first optocoupler secondary side positive polarity input terminal are connect with power supply, the first optocoupler secondary side cathode
Property input terminal is connect with the first power supply chip output terminal, and the second resistance other end is connect with the first optocoupler output, the first optocoupler
The input terminal that output terminal buffers enhancing circuit as pwm signal isolation circuit output terminal with pwm signal is connect, and the two of the first optocoupler
Secondary side positive polarity input terminal and secondary side negative polarity input terminal form the power port of pwm signal isolation circuit.
8. a kind of on-line monitoring device of intelligent type low-voltage circuit breaker according to claim 7, which is characterized in that
The pwm signal buffering enhancing circuit, including：First three state buffer, third capacitance, wherein, the first three state buffer
Input terminal buffers enhancing circuit input end as pwm signal and is connect with pwm signal isolation circuit output terminal, the first three state buffer
Enable Pin, the first three state buffer positive pole port, third capacitance one are extremely connect with power supply, another pole of third capacitance with
First three state buffer power cathode port connects, the positive pole port of the first three state buffer and power cathode end
Mouth forms the power port of pwm signal buffering enhancing circuit, and the first three state buffer output terminal is buffered as pwm signal enhances electricity
The output terminal on road is connect with the input terminal of pwm signal filter circuit；
Circuit occurs for the PWM high-precisions, including：First voltage-stabiliser tube and 3rd resistor, wherein, the first regulator tube negative conduct
PWM high-precisions occur circuit input end and are connect with power supply, and the first voltage-stabiliser tube anode and 3rd resistor one end are simultaneously used as PWM high after connecing
The output terminal that circuit occurs for precision is connected with the power cathode port of the first three state buffer, the 3rd resistor other end and electricity
Source is grounded jointly.
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| CN106872067B (en) * | 2017-02-21 | 2023-10-17 | 焦海军 | Temperature isolation acquisition circuit |
| CN107091607A (en) * | 2017-05-10 | 2017-08-25 | 北京布莱迪测控仪表有限公司 | Angle measurement unit and method based on magnetic core logical circuit deflection |
| CN107968485A (en) * | 2017-12-20 | 2018-04-27 | 陈旭斌 | A kind of adaptive microcomputer protecting controller of Multi-netmouth |
| CN112881763B (en) * | 2020-12-29 | 2023-07-18 | 南京长亚轨道交通科技有限公司 | Alternating current constant current load circuit |
| CN114034893A (en) * | 2021-11-17 | 2022-02-11 | 贵州电网有限责任公司 | Multifunctional wiring terminal integrating remote measurement and remote signaling acquisition |
| CN114167778A (en) * | 2021-12-03 | 2022-03-11 | 长沙奥托自动化技术有限公司 | Circuit and method for stably outputting analog voltage and current signals |
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