CN106774573B - Electronic breaker current source control system of invariable pressure and method - Google Patents
Electronic breaker current source control system of invariable pressure and method Download PDFInfo
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- CN106774573B CN106774573B CN201611130740.2A CN201611130740A CN106774573B CN 106774573 B CN106774573 B CN 106774573B CN 201611130740 A CN201611130740 A CN 201611130740A CN 106774573 B CN106774573 B CN 106774573B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Abstract
The present invention relates to electronic breaker current source control system of invariable pressure and method, including Current Mutual Inductance module, for providing power supply and sample rate current from high-pressure side by current coupling to low-pressure side for system；Rectification module, for AC power to be rectified into the pulsating volage of single direction；Power control module, for the pulsating volage of single direction to be further limited in a fixed scope, ensure the stable output of back-end circuit；Insulation blocking module, for reverse direction current flow in anti-locking system, the effect of breakdown power control module；Voltage stabilizing module, for the voltage value stabilization being limited in a fixed range that exports power control module after a fixed value to outer output.A kind of electronic breaker current source control system of invariable pressure provided by the invention and method, load stabilization voltage is adjusted by the way of metal-oxide-semiconductor control unit and PWM control combinations, small with generating heat, current range is wide, the advantages of voltage output is stable, and the simple cost of circuit is low.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of electronic breaker current source control system of invariable pressure.
Background technology
Present invention is mainly applied to without accessory power supply, have in the equipment that electric current passes through to produce constant voltage to internal electron
The occasion of equipment power supply.Such as electronic breaker, omnipotent breaker, the electric current flowed through during its work is from several amperes to up to ten thousand
Ampere, such as come constant defeated by the way of traditional variable impedance (load impedance of different sizes is produced according to the size of electric current)
Go out voltage, then load impedance has very high power dissipation so as to produce very big heat, it is necessary to select when passing through high current
With high power load, and have burn risk for a long time.
The content of the invention
The defects of for prior art, the present invention is intended to provide a kind of electronic breaker current source Isobarically Control system
System, can adjust load stabilization voltage by the way of metal-oxide-semiconductor control unit and PWM control combinations, have small, the electric current that generates heat
The advantages of scope is wide, and the simple cost of circuit is low.
In a first aspect, the invention provides electronic breaker current source control system of invariable pressure, including：
Current Mutual Inductance module, for providing power supply and sample rate current from high-pressure side by current coupling to low-pressure side for system；
Rectification module, for AC power to be rectified into the pulsating volage of single direction；
Power control module, for the pulsating volage of single direction to be further limited in a fixed scope, protect
Demonstrate,prove the stable output of back-end circuit；
Insulation blocking module, for reverse direction current flow in anti-locking system, the effect of breakdown power control module；
Voltage stabilizing module, for the voltage value stabilization being limited in a fixed range that exports power control module one
Outwards exported after individual fixed value.
Further, the output end of the Current Mutual Inductance module is connected to the input of the rectification module, the rectification
The output end of module is connected to the input of insulation blocking module, and the output end of the insulation blocking module is connected to the voltage stabilizing
The input of module, the input of the power control module are connected with the output end of the insulation blocking module, the power
The output end of control module is connected with the input of the insulation blocking module.
Further, the power control module includes pwm signal generating unit and metal-oxide-semiconductor control unit, the PWM
The output end of signal generating unit is connected with the grid of metal-oxide-semiconductor control unit, and the source electrode of the metal-oxide-semiconductor control unit is connected to institute
The input of insulation blocking module is stated, the drain electrode of the metal-oxide-semiconductor control unit is connected to place of working.
Further, the Current Mutual Inductance module include power-type Current Transmit 1, power-type Current Transmit 2,
Power-type Current Transmit 3, the power-type Current Transmit 1 sample the voltage and electricity of L1 phase lines in three alternating currents
Stream, the power-type Current Transmit 2 sample the voltage and current of L2 phase lines in three alternating currents, and the power-type electric current is mutual
Sensor CT3 samples the voltage and current of L3 phase lines in three alternating currents.
Further, the rectification module includes rectifier bridge U3, rectifier bridge U4, the of rectifier bridge U5, the rectifier bridge U3
One pin and second pin are respectively connecting to the power-type Current Transmit 1, the first pin of the rectifier bridge U4 and
Two pins are respectively connecting to the power-type Current Transmit 2, the first pin and the second pin difference of the rectifier bridge U5
It is connected to the power-type Current Transmit 3；The rectifier bridge U3, rectifier bridge U4, rectifier bridge U5 are respectively connecting to described two
The input of pole pipe isolation module.
Further, the Voltage stabilizing module include three terminal regulator U2, the first electric capacity of voltage regulation C1, the second electric capacity of voltage regulation C2,
3rd electric capacity of voltage regulation C3 and the 4th electric capacity of voltage regulation C4；The second pin of the three terminal regulator U2 is connected to place of working, described
Three terminal regulator U2 the first pin is connected to power supply VCC, the first electric capacity of voltage regulation C1 and the second electric capacity of voltage regulation C2 difference
It is connected across between the 3rd pin and the place of working of the three terminal regulator U2, the 3rd electric capacity of voltage regulation C3 and the 4th voltage stabilizing electricity
Hold C4 to be connected across respectively between the first pin and the place of working of the three terminal regulator U2.
Further, the pwm signal generating unit include operational amplifier U1 and resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, resistance R7, the operational amplifier U1 the 8th pin are connected to power supply VCC, the computing
Amplifier U1 the 4th pin is connected to place of working, and the second pin of the operational amplifier U1 connects respectively in parallel
To resistance R6 one end and resistance R7 one end, the 3rd pin of the operational amplifier U1 is respectively connecting in parallel
Resistance R2 one end and resistance R3 one end；The first pin of the operational amplifier U1 is connected with one end of the resistance R1,
The other end of the resistance R1 is connected to the grid of the metal-oxide-semiconductor control unit；The other end of the resistance R6 is connected to power supply
VCC, the other end of the resistance R7 are connected to place of working；The other end of the resistance R2 is connected to the first of operational amplifier U1
Pin, the other end of the resistance R3 is respectively connecting to resistance R4 one end and resistance R5 one end in parallel, described
The resistance R4 other end is connected to the output end of the insulation blocking module, and the other end of the resistance R5 is connected to place of working.
As shown from the above technical solution, a kind of electronic breaker current source control system of invariable pressure provided by the invention, if
Be equipped with output to rectification module after three power type mutual inductors gather the electric currents of three alternating currents respectively and carry out rectification, can directly by
Three exchange electricity outputs make it produce constant voltage and powered to internal electronic equipment into the equipment for having electric current to pass through.And use
Metal-oxide-semiconductor control unit and the mode of PWM control combinations adjust load stabilization voltage, and finally to carry out direct current using Voltage stabilizing module steady
Pressure output.System provided by the invention load impedance when passing through high current is low, and heating is small.Voltage output is stable.
Circuit provided by the invention, which is additionally provided with insulation blocking module, prevents electric current from inversely flowing to metal-oxide-semiconductor control unit, from
And influence the stabilization of output voltage.The advantages of adjustable current scope that the present invention also has is wide, and circuit is simple, cost is low.
Second aspect, the invention provides a kind of electronic breaker current source constant pressure control method, including：
Step S1：Using power-type Current Transmit 1, CT2, CT3 respectively by the L1 phase lines of three alternating currents, L2
Phase line, the electric current of L3 phase lines are coupled respectively to rectifier bridge U3, rectifier bridge U4, rectifier bridge U5；
Step S2：Rectifier bridge U3, rectifier bridge U4, rectifier bridge U5 are respectively by the electric currents of the L1 phase lines sampled, L2 phase lines
Electric current, the electric current of L3 phase lines are exported to three terminal regulator U2 the 3rd pin after carrying out full-wave rectification by insulation blocking module；
Step S3：Operational amplifier U1 judges the magnitude of voltage of the 3rd pin of the three terminal regulator U2, if under it reaches
Voltage limit then enters step S4, and step S5 is entered if it reaches upper voltage limit；The 3rd pin electricity of the three terminal regulator U2
Pressure value circulation change between upper voltage limit and lower voltage limit；
Step S4：When step S3 magnitude of voltage judged result is lower voltage limit, then the pins of operational amplifier U1 first are defeated
Go out low level OV so that metal-oxide-semiconductor control unit is ended, and now the L1 phase lines, L2 phase lines, the electric current of L3 phase lines flow through isolation and protected
Shield module is exported to the 3rd pin of three terminal regulator, and is charged to the first electric capacity of voltage regulation C1, makes the operational amplifier U1's
The magnitude of voltage rise of 3rd pin；
Step S5：When step S3 magnitude of voltage judged result is upper voltage limit, then the pins of operational amplifier U1 first are defeated
Go out high level 5V so that metal-oxide-semiconductor control unit turns on, and now the electric current of the L1 phase lines, L2 phase lines, L3 phase lines is all from MOS
Management and control unit flow to place of working, makes the magnitude of voltage of the 3rd pin of the operational amplifier U1 due to the first electric capacity of voltage regulation C1's
Discharge and reduce.
Further, in the step S3, the change frequency of the magnitude of voltage of the 3rd pin of the three terminal regulator U2 with
The increase of input current and increase.
Further, the electricity that the insulation blocking module in the step S5 is used to prevent the first electric capacity of voltage regulation C1 from storing falls
It flow to metal-oxide-semiconductor control unit.
As shown from the above technical solution, a kind of electronic breaker current source constant pressure control method provided by the invention, if
It is equipped with after three power type mutual inductors gather every electric current of three alternating currents respectively and exports to rectification module progress rectification, can be straight
Connect three exchange electricity outputs into the equipment for thering is electric current to pass through, it is produced constant voltage and powered to internal electronic equipment.And
Load stabilization voltage is adjusted by the way of the combination of metal-oxide-semiconductor control unit and hysteresis comparator in the same direction is adjusted using PWM, most
Afterwards DC voltage-stabilizing output is carried out using Voltage stabilizing module.
The change frequency of the output low and high level of hysteresis comparator in the same direction provided by the invention is basis from three alternating currents
The size of each phase current and the size of electric capacity of voltage regulation select to determine.The frequency that voltage adjusts when every electric current is bigger is more
It is high.Therefore the voltage stabilizing output when present invention can make high current uses.
System provided by the invention load impedance when passing through high current is low, and heating is small, and voltage output is stable.
Circuit provided by the invention, which is additionally provided with insulation blocking module, prevents electric current from inversely flowing to metal-oxide-semiconductor control unit, from
And influence the stabilization of output voltage.The advantages of adjustable current scope that the present invention also has is wide, and circuit is simple, cost is low.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art.In all of the figs, similar element
Or part is typically identified by similar reference.In accompanying drawing, each element or part might not be drawn according to the ratio of reality.
Fig. 1 shows the module map for the electronic breaker current source control system of invariable pressure that the embodiment of the present invention is provided；
Fig. 2 shows the circuit diagram for the electronic breaker current source control system of invariable pressure that the embodiment of the present invention is provided；
Fig. 3 shows the DC/DC moulds for the electronic breaker current source control system of invariable pressure that the embodiment of the present invention is provided
The circuit diagram of block；
Fig. 4 shows the flow chart for the electronic breaker current source constant pressure control method that the embodiment of the present invention is provided.
Reference：1- Current Mutual Inductance modules；2- rectification modules；3- power control modules；4- insulation blocking modules；5- is steady
Die block.
Embodiment
The embodiment of technical solution of the present invention is described in detail below in conjunction with accompanying drawing.Following examples are only used for
Clearly illustrate technical scheme, therefore be intended only as example, and the protection of the present invention can not be limited with this
Scope.It should be noted that unless otherwise indicated, technical term or scientific terminology used in this application should be institute of the present invention
The ordinary meaning that category art personnel are understood.
As shown in figure 1, the embodiment of the present invention one provides electronic breaker current source control system of invariable pressure, including：
Current Mutual Inductance module, for from high-pressure side by current coupling to low-pressure side for system provide power supply and sampled voltage,
Electric current；
Rectification module, for AC power to be rectified into the pulsating volage of single direction；
Power control module, for the pulsating volage of single direction to be further limited in a fixed scope, protect
Demonstrate,prove the stable output of back-end circuit；
Insulation blocking module, for reverse direction current flow in anti-locking system, the effect of breakdown power control module；
Voltage stabilizing module, for the voltage value stabilization being limited in a fixed range that exports power control module one
Outwards exported after individual fixed value.
In the present embodiment, the output end of the Current Mutual Inductance module is connected to the input of the rectification module, described whole
The output end of flow module is connected to the input of insulation blocking module, and the output end of the insulation blocking module is connected to described steady
The input of die block, the input of the power control module are connected with the output end of the insulation blocking module, the work(
The output end of rate control module is connected with the input of the insulation blocking module.
In the present embodiment, the power control module includes pwm signal generating unit and metal-oxide-semiconductor control unit, described
The output end of pwm signal generating unit is connected with the grid of metal-oxide-semiconductor control unit, the source electrode connection of the metal-oxide-semiconductor control unit
To the input of the insulation blocking module, the drain electrode of the metal-oxide-semiconductor control unit is connected to place of working.
In the present embodiment, the metal-oxide-semiconductor control unit apolegamy is the N-channel type FET that model is 20N06.
In the present embodiment, the Current Mutual Inductance module includes power-type Current Transmit 1, power-type current transformer
CT2, power-type Current Transmit 3, the power-type Current Transmit 1 sample the electric current of L1 phase lines in three alternating currents,
The power-type Current Transmit 2 samples the electric current of L2 phase lines in three alternating currents, and the power-type Current Transmit 3 is adopted
The electric current of L3 phase lines in three alternating currents of sample.
In the present embodiment, the rectification module include be connected to power-type Current Transmit 1 MB6S type rectifier bridges U3,
The MB6S type rectifier bridges U4 that is connected to power-type Current Transmit 2, the MB6S types for being connected to power-type Current Transmit 3 are whole
Flow bridge U5.The first pin and second pin of the rectifier bridge U3 is respectively connecting to the power-type Current Transmit 1, described
Rectifier bridge U4 the first pin and second pin is respectively connecting to the power-type Current Transmit 2, the rectifier bridge U5's
First pin and second pin are respectively connecting to the power-type Current Transmit 3；It is the rectifier bridge U3, rectifier bridge U4, whole
Stream bridge U5 is respectively connecting to the input of the diode-isolated module.
In the present embodiment, the insulation blocking module is patch-type M7 diodes D1.
In the present embodiment, the Voltage stabilizing module includes three terminal regulator U2, the first electric capacity of voltage regulation C1, the second electric capacity of voltage regulation
C2, the 3rd electric capacity of voltage regulation C3 and the 4th electric capacity of voltage regulation C4；The second pin of the three terminal regulator U2 is connected to place of working, institute
The first pin for stating three terminal regulator U2 is connected to power supply VCC, the first electric capacity of voltage regulation C1 and C2 points of the second electric capacity of voltage regulation
It is not connected across between the 3rd pin and the place of working of the three terminal regulator U2, the 3rd electric capacity of voltage regulation C3 and the 4th voltage stabilizing
Electric capacity C4 is connected across between the first pin and the place of working of the three terminal regulator U2 respectively.
In the present embodiment, the model 78L05, the first electric capacity of voltage regulation C1 of the three terminal regulator U2 are 1000 μ F/
25V, the second electric capacity of voltage regulation C2 are that 0.1 μ F, the 3rd electric capacity of voltage regulation C1 is 470 μ F/25V, the 4th electric capacity of voltage regulation
C1 is 0.1 μ F.
In the present embodiment, the pwm signal generating unit be operational amplifier U1 and resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, the hysteresis comparator in the same direction of resistance R7 compositions.The 8th pin of the operational amplifier U1 connects
The 4th pin for being connected to power supply VCC, the operational amplifier U1 is connected to place of working, the second pin of the operational amplifier U1
Be respectively connecting to resistance R6 one end and resistance R7 one end in parallel, the 3rd pin of the operational amplifier U1 with
Mode in parallel is respectively connecting to resistance R2 one end and resistance R3 one end；The first pin of the operational amplifier U1 and institute
Resistance R1 one end connection is stated, the other end of the resistance R1 is connected to the V1 grids of the N-channel type FET；The electricity
The resistance R6 other end is connected to power supply VCC, and the other end of the resistance R7 is connected to place of working；The other end of the resistance R2 connects
Operational amplifier U1 the first pin is connected to, the other end of the resistance R3 is respectively connecting to the one of resistance R4 in parallel
End and resistance R5 one end, the other end of the resistance R4 are connected to the output end of the diode D1, and the resistance R5's is another
One end is connected to place of working.
In the present embodiment, the resistance R1 is 200 Ω, and the resistance R2 is 10K Ω, and the resistance R3 is 2K Ω, described
Resistance R4 is 6.8K Ω, and the resistance R5 is 2K Ω, and the resistance R6 is that 10K Ω, the resistance R7 are 10K Ω.It is described in the same direction
The upper voltage limit of hysteresis comparator is Vh=((1+R3/R4) * 2.5) * ((R5+R4)/R5)=13.2V, the sluggish ratio in the same direction
Lower voltage limit compared with device is Vl=(((1+R3/R2) * 2.5)-((R3/R2) * 5)) * ((R5+R4)/R5)=8.8V.
In the present embodiment, the model LM258D of the operational amplifier U1.
A kind of electronic breaker current source control system of invariable pressure provided in an embodiment of the present invention, is provided with three power-types
Transformer CT1, CT2, CT3 are exported to rectification module after gathering the L1 items line, L2 items line, L3 item line currents of three alternating currents respectively
Rectification is carried out, directly by three exchange electricity outputs into the equipment for having electric current to pass through it can be made to produce constant voltage to internal electricity
Sub- equipment power supply.And load stabilization voltage is adjusted by the way of the metal-oxide-semiconductor control unit and PWM control combinations, finally utilize
Voltage stabilizing module carries out DC voltage-stabilizing output.System provided in an embodiment of the present invention load impedance when passing through high current is low, heating
It is small.Voltage output is stable.
Circuit provided by the invention, which is additionally provided with insulation blocking module, prevents electric current from inversely flowing to metal-oxide-semiconductor control unit, from
And influence the stabilization of output voltage.In addition, the advantages of adjustable current scope that the present invention also has is wide, and circuit is simple, cost is low.
One alternative solution of the embodiment of the present invention one, is that the Voltage stabilizing module in circuit is replaced with into DC/DC modules；Due to
Line current changes very greatly in peak of power consumption and low ebb, therefore the voltage induced from power-type current transformer is in line electricity
Stream only has several volts when smaller, and output voltage has tens volts when line current is very big, it is therefore desirable to can be in interior work in a big way
The mu balanced circuit of work.
About 2V or so the voltage drops of 78 serial three terminal regulators in itself, the power consumption of itself are also larger.And previously exist
The voltage that low current state induces only has several volts, now the embodiment of the present invention selection 78L05 type three terminal regulators it is defeated
Go out voltage to be difficult to meet the direct voltage output needed for load.
The DC/DC modules of the wide input of selecting always of the embodiment of the present invention, this designs the stabilization that can improve total system
Property.
As shown in Figure 3：The DC/DC modules that the embodiment of the present invention one is selected include：First electric capacity of voltage regulation C1, the second voltage stabilizing electricity
Hold C2, protection electric capacity CY, diode VD, piezo-resistance VR and isolation voltage stabilizing dual output DC/DC chips.
The piezo-resistance VR, the first electric capacity of voltage regulation C1, the second electric capacity of voltage regulation C2 are respectively parallel across A, the B for being connected on circuit
Both ends,
The diode VD is connected between the first electric capacity of voltage regulation C1 and the second electric capacity of voltage regulation C2.
When circuit breaks down, input voltage moment falls (several seconds after such as line fault), DC/DC module inputs
The first electric capacity of voltage regulation C1 be used to providing maintenance voltage to DC/DC modules within a certain period of time, and absorbable module input
Due to voltage spikes.In order to meet the requirement held time, the general electrochemical capacitor for selecting Large Copacity.The present embodiment is specially 1000 μ
F.In a diode VD of the first electric capacity of voltage regulation C1 front ends series connection, when the first electric capacity of voltage regulation C1 discharges, diode VD cut-outs
The discharge path of power input；In order to reduce the voltage drop on diode VD, Xiao Jite bis- is used in the embodiment of the present invention one
Pole pipe.In order to reduce common-mode noise, spy's increase CY electric capacity, the connecting node of CY electric capacity is connected with module housing and system protection
Connect, be typically chosen several nF high frequency capacitance.Concrete numerical value scope is in 1nF between 5nF.
The piezo-resistance VR is used to protect DC/DC modules, prevents the maximum that can be born for exceeding DC/DC in front voltage
Magnitude of voltage and damage DC/DC modules, when input voltage exceed DC/DC modules maximum input voltage when, piezo-resistance VR is hit
Wear, the voltage for being now loaded into DC/DC inputs is exactly piezo-resistance VR voltage stabilizing value, so as to protect DC/DC modules.
The alternative solution of the embodiment of the present invention one is from Width funtion isolation voltage stabilizing DC/DC, and its transient response is fast, and low ripple is made an uproar
Voice output, it is only necessary to a small amount of peripheral cell, you can work, pin position uses 5PIN dual-in-lines, compact package, has good shielding
The function such as jamming performance and Electro Magnetic Compatibility, excessively stream, overload, short-circuit protection, self- recoverage.
The alternative solution of the embodiment of the present invention one can ensure in the range of wide input voltage that stable offer 15V's is defeated
Go out voltage.
As shown in figure 4, the embodiment of the present invention two provides a kind of electronic breaker current source constant pressure control method, bag
Include：
Step S1：Using power-type Current Transmit 1, CT2, CT3 respectively by the L1 phase lines of three alternating currents, L2
Phase line, the electric current of L3 phase lines are coupled respectively to rectifier bridge U3, rectifier bridge U4, rectifier bridge U5；
Step S2：Rectifier bridge U3, rectifier bridge U4, rectifier bridge U5 are respectively by the electric currents of the L1 phase lines sampled, L2 phase lines
Electric current, the electric current of L3 phase lines are exported to the of three terminal regulator U2 after carrying out full-wave rectification by insulation blocking module diode D1
Three pins；
Step S3：Operational amplifier U1 judges the magnitude of voltage of the pins of three terminal regulator U2 the 3rd, if it reaches lower limit
Then enter step S4 during voltage 8.8V, when it reaches upper voltage limit 13.2V if enter step S5；The three terminal regulator U2's
3rd pin voltage value circulation change between upper voltage limit 13.2V and lower voltage limit 8.8V；
Step S4：When step S3 magnitude of voltage judged result is lower voltage limit, then the pins of operational amplifier U1 first are defeated
Go out low level OV so that N-channel FET V1 ends, and now the L1 phase lines, L2 phase lines, the electric current of L3 phase lines flow through isolation
Protection module diode D1 is exported to three terminal regulator U2 the 3rd pin, and is charged to the first electric capacity of voltage regulation C1, makes the fortune
Calculate the magnitude of voltage rise of amplifier U1 the 3rd pin；
Step S5：When step S3 magnitude of voltage judged result is upper voltage limit, then the pins of operational amplifier U1 first are defeated
Go out high level 5V so that N-channel FET V1 is turned on, and now the electric current of the L1 phase lines, L2 phase lines, L3 phase lines is all from N
Channel field-effect pipe V1 flow to place of working, makes the magnitude of voltage of the 3rd pin of the operational amplifier U1 due to the first electric capacity of voltage regulation
C1 electric discharge and reduce.
In the present embodiment, the second electric capacity of voltage regulation C2, the 3rd electric capacity of voltage regulation C3, the 4th electric capacity of voltage regulation C4 are used for three ends
The further voltage stabilizing of magnitude of voltage of voltage-stablizer U2 the 3rd pin to 5V definite values export.
In the present embodiment, the insulation blocking module diode D1 in the step S5 is used to prevent the first electric capacity of voltage regulation C1 from storing up
The electricity deposited flows backward to the N-channel FET V1.
The operation principle of the embodiment of the present invention two is：When AC line current increases, output voltage synchronously increases, when
Voltage increases to operational amplifier U1 upper voltage limit, i.e. during Vh=((1+R3/R4) * 2.5) * ((R5+R4)/R5)=13.2V,
Operational amplifier U1 exports 5V high level so that N-channel FET V1 is turned on, and now AC is by power-type current transformer
The electric current that CT1, CT2, CT3 coupling come is shorted to place of working, due to N-channel FET V1 internal resistance very little, even if when electricity
In the case that stream is very big, caused power also very little, its heating will not be caused.Now, diode D1 cathode voltage is 0, two
Pole pipe D1 negative pole due to the first electric capacity of voltage regulation C1 presence and voltage remains unchanged, the hysteresis comparator in the same direction of rear end is by first
The electricity power supply of electric capacity of voltage regulation C1 storages, its voltage gradually reduce with the first electric capacity of voltage regulation C1 electric quantity consumption.Work as voltage
Be reduced to the lower voltage limit of hysteresis comparator in the same direction, i.e. Vl=(((1+R3/R2) * 2.5)-((R3/R2) * 5)) * ((R5+R4)/
R5)=8.8V when, hysteresis comparator in the same direction output low level 0V so that N-channel FET V1 ends, and now AC is by work(
The electric current that rate type Current Transmit 1, CT2, CT3 coupling come flows anew through diode D1 and powered to back-end circuit and to first
Electric capacity of voltage regulation C1 charges, when the first electric capacity of voltage regulation C1 charges to upper voltage limit, i.e. Vh=((1+R3/R4) * 2.5) * ((R5+R4)/
R5)=13.2V when, hysteresis comparator in the same direction trigger again N-channel FET V1 conducting, complete a complete cycle voltage
Regulation.
In the present embodiment, the change frequency of the magnitude of voltage in the step S6 increases with the increase of input current, so as to
Ensure the constant pressure output of rear end Voltage stabilizing module.
A kind of electronic breaker current source constant pressure control method that the embodiment of the present invention two provides, is provided with three power
Type transformer is exported to rectification module progress rectification after gathering every electric current of three alternating currents respectively, can be directly by three exchanges
Electricity output makes it produce constant voltage and powered to internal electronic equipment into the equipment for having electric current to pass through.And using N-channel field effect
The mode that is adjusted with the combination of hysteresis comparator in the same direction using PWM should be managed to adjust load stabilization voltage, finally utilize voltage stabilizing mould
Block carries out DC voltage-stabilizing output.The change frequency of operational amplifier U1 output low and high level be according to from three alternating current L1,
The size of L2, L3 phase line current and electric capacity of voltage regulation C1 size select to determine.When every electric current is bigger, voltage adjusts
Frequency it is higher.Therefore the voltage stabilizing when embodiment of the present invention two may be used as high current exports.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme, it all should cover among the claim of the present invention and the scope of specification.
Claims (7)
1. electronic breaker current source control system of invariable pressure, it is characterised in that including：
Current Mutual Inductance module, for providing power supply and sample rate current from high-pressure side by current coupling to low-pressure side for system；
Rectification module, for AC power to be rectified into the pulsating volage of single direction；
Power control module, for the pulsating volage of single direction to be further limited in a fixed scope, after guarantee
The stable output of terminal circuit；
Insulation blocking module, for reverse direction current flow in anti-locking system, the effect of breakdown power control module；
Voltage stabilizing module, for the voltage value stabilization being limited in a fixed range that power control module exports is solid at one
Outwards exported after definite value；
Wherein, the output end of the Current Mutual Inductance module is connected to the input of the rectification module, the rectification module it is defeated
Go out the input that end is connected to insulation blocking module, the output end of the insulation blocking module is connected to the defeated of the Voltage stabilizing module
Enter end, the input of the power control module is connected with the output end of the insulation blocking module, the power control module
Output end be connected with the input of the insulation blocking module；
The power control module includes pwm signal generating unit and metal-oxide-semiconductor control unit, the pwm signal generating unit
Output end be connected with the grid of metal-oxide-semiconductor control unit, the source electrode of the metal-oxide-semiconductor control unit is connected to the insulation blocking mould
The input of block, the drain electrode of the metal-oxide-semiconductor control unit are connected to place of working；
The pwm signal generating unit includes operational amplifier U1 and resistance R1, resistance R2, resistance R3, resistance R4, resistance
R5, resistance R6, resistance R7, the operational amplifier U1 the 8th pin are connected to power supply VCC, and the of the operational amplifier U1
Four pins are connected to place of working, and the second pin of the operational amplifier U1 is respectively connecting to the one of resistance R6 in parallel
End and resistance R7 one end, the 3rd pin of the operational amplifier U1 are respectively connecting to resistance R2 one end in parallel
With resistance R3 one end；The first pin of the operational amplifier U1 is connected with one end of the resistance R1, the resistance R1's
The other end is connected to the grid of the metal-oxide-semiconductor control unit；The other end of the resistance R6 is connected to power supply VCC, the resistance
The R7 other end is connected to place of working；The other end of the resistance R2 is connected to operational amplifier U1 the first pin, the electricity
The resistance R3 other end is respectively connecting to resistance R4 one end and resistance R5 one end in parallel, and the resistance R4's is another
End is connected to the output end of the insulation blocking module, and the other end of the resistance R5 is connected to place of working.
2. electronic breaker current source control system of invariable pressure according to claim 1, it is characterised in that：The electric current is mutual
Feeling module includes power-type Current Transmit 1, power-type Current Transmit 2, power-type Current Transmit 3, the work(
The electric current of L1 phase lines in the sampling three-phase alternating current of rate type Current Transmit 1, the sampling of power-type Current Transmit 2 three
The electric current of L2 phase lines in cross streams electricity, the electric current of L3 phase lines in the sampling three-phase alternating current of power-type Current Transmit 3.
3. electronic breaker current source control system of invariable pressure according to claim 2, it is characterised in that：The rectification mould
Block is respectively connecting to institute including rectifier bridge U3, rectifier bridge U4, rectifier bridge U5, the rectifier bridge U3 the first pin and second pin
Power-type Current Transmit 1 is stated, the first pin and second pin of the rectifier bridge U4 are respectively connecting to the power-type electricity
Current transformer CT2, the rectifier bridge U5 the first pin and second pin are respectively connecting to the power-type current transformer
CT3；The rectifier bridge U3, rectifier bridge U4, rectifier bridge U5 are respectively connecting to the input of the insulation blocking module.
4. electronic breaker current source control system of invariable pressure according to claim 1, it is characterised in that：The voltage stabilizing mould
Block includes three terminal regulator U2, the first electric capacity of voltage regulation C1, the second electric capacity of voltage regulation C2, the 3rd electric capacity of voltage regulation C3 and the 4th voltage stabilizing electricity
Hold C4；The second pin of the three terminal regulator U2 is connected to place of working, and the first pin of the three terminal regulator U2 is connected to
Power supply VCC, the first electric capacity of voltage regulation C1 and the second electric capacity of voltage regulation C2 are connected across the 3rd of the three terminal regulator U2 respectively
Between pin and place of working, the 3rd electric capacity of voltage regulation C3 and the 4th electric capacity of voltage regulation C4 is connected across the three terminal regulator respectively
Between U2 the first pin and place of working.
A kind of 5. electronic breaker current source constant pressure control method, it is characterised in that：
Step S1：Using power-type Current Transmit 1, CT2, CT3 respectively by the L1 phase lines, L2 phase lines, L3 of three-phase alternating current
The electric current of phase line is coupled respectively to rectifier bridge U3, rectifier bridge U4, rectifier bridge U5；
Step S2：Rectifier bridge U3, rectifier bridge U4, rectifier bridge U5 respectively by the electric current of the L1 phase lines sampled, L2 phase lines electric current,
The electric current of L3 phase lines is exported to three terminal regulator U2 the 3rd pin after carrying out full-wave rectification by insulation blocking module；
Step S3：Operational amplifier U1 judges the magnitude of voltage of the pins of three terminal regulator U2 the 3rd, if it reaches lower voltage limit
Then enter step S4, step S5 is entered if it reaches upper voltage limit；The pin voltage values of three terminal regulator U2 the 3rd are upper
Circulation change between voltage limit and lower voltage limit；
Step S4：When step S3 magnitude of voltage judged result is lower voltage limit, then the output of the pins of operational amplifier U1 first is low
Level OV so that metal-oxide-semiconductor control unit is ended, and now the L1 phase lines, L2 phase lines, the electric current of L3 phase lines flow through insulation blocking mould
Block is exported to three terminal regulator U2 the 3rd pin, and is charged to the first electric capacity of voltage regulation C1, makes the of the operational amplifier U1
The magnitude of voltage rise of three pins；
Step S5：When step S3 magnitude of voltage judged result is upper voltage limit, then the output of the pins of operational amplifier U1 first is high
Level 5V so that metal-oxide-semiconductor control unit turns on, and now the electric current of the L1 phase lines, L2 phase lines, L3 phase lines is all from metal-oxide-semiconductor control
Unit processed flow to place of working, makes the magnitude of voltage of the 3rd pin of the operational amplifier U1 due to the first electric capacity of voltage regulation C1 electric discharge
And reduce.
A kind of 6. electronic breaker current source constant pressure control method according to claim 5, it is characterised in that：The step
In rapid S3, the change frequency of the magnitude of voltage of the 3rd pin of the three terminal regulator U2 increases with the increase of input current.
A kind of 7. electronic breaker current source constant pressure control method according to claim 5, it is characterised in that：The step
The electricity that insulation blocking module in rapid S5 is used to prevent the first electric capacity of voltage regulation C1 from storing flows backward to metal-oxide-semiconductor control unit.
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| JP2003233426A (en) * | 2002-02-07 | 2003-08-22 | Kenwood Corp | Direct-current stabilization power supply circuit |
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Address after: 5, building 310052, building 1, Jing An Pioneer Park, No. 316 Jiang Hong Road, Hangzhou, Zhejiang, Binjiang District Applicant after: Hangzhou Ming Yang Technology Co., Ltd. Address before: 311200, Zhejiang Province, Xiaoshan District, Hangzhou province Wen Yan Street, town, village, home town Applicant before: Hangzhou Ming Yang Technology Co., Ltd. |
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