CN101866192B - Device for fast stabilizing alternating current in power frequency period - Google Patents
Device for fast stabilizing alternating current in power frequency period Download PDFInfo
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- CN101866192B CN101866192B CN2010101814668A CN201010181466A CN101866192B CN 101866192 B CN101866192 B CN 101866192B CN 2010101814668 A CN2010101814668 A CN 2010101814668A CN 201010181466 A CN201010181466 A CN 201010181466A CN 101866192 B CN101866192 B CN 101866192B
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Abstract
The invention relates to a device for fast stabilizing an alternating current in a power frequency period. The device consists of a current transformer, a first current/voltage converter, a standard current generator, a second current/voltage converter, a comparator, a fixed amplifier and a first coupling transformer. The device has the characteristics of environmental protection, high quality, high efficiency, fastness and the like, and has the function of stabilizing the alternating current.
Description
Technical field
The present invention relates to the device of fast and stable alternating current in a power frequency period, belong to ac current regulator equipment.
Background technology
Between the effective value of electric current and waveform and some desired indicator bigger deviation having taken place, therefore need stablize electric current in the user power utilization process.The steady current effective value generally adopts current regulator at present, and its a kind of current regulator is to come the steady load electric current or in needing the circuit of steady current, seal in reactor (being commonly called as ballast resistor) to limit and the steady load electric current with the steady load voltage method.The former can not stablize the load current change owing to the impedance variations that causes from thermal phenomenon, and the latter can not solve owing to voltage slowly changes the load current change that causes, so steady flow result is not good enough.Moreover load characteristic is multifarious, is difficult to make the product of specification series, and therefore the application of above-mentioned current regulator is restricted.
Summary of the invention
Technical matters to be solved by this invention provide a kind of in a power frequency period device of fast and stable alternating current.
The technical solution adopted for the present invention to solve the technical problems:
The present invention is made up of current transformer, first current/voltage converter, standard current generator, second current/voltage converter, comparer, fixed voltage amplifier, first coupling transformer; Elementary and the load of said current transformer is connected; The secondary input end that connects first current/voltage converter of said current transformer; An input end of the said comparer of output termination of said first current/voltage converter, the output voltage of said first current/voltage converter is U
yThe input end of said second current/voltage converter of output termination of said standard current generator, the output voltage of said second current/voltage converter is U
x, another input end of the said comparer of output termination of said second current/voltage converter, the output voltage of said comparer is U
XyThe output voltage U of said comparer
XyOutput voltage U with said second current/voltage converter
xConnect said fixed voltage amplifier input terminal after the series connection; Said first coupling transformer of output termination of said fixed voltage amplifier elementary, the secondary two ends that are connected in parallel on by the elementary branch road that is composed in series of said load and current transformer of said first coupling transformer.
Principle of work of the present invention is following:
The present invention need not test calculating; But compare after utilizing artificial normalized current of making of replacing and actual current to convert voltage respectively to; Find out difference is amplified to certain power again through amplifier form fast return primary circuit; Depart from electric current with counteracting, thereby obtained desirable electric current, reached the purpose of steady current.
Beneficial effect of the present invention is following:
The normalized current degree of stability of (1) making should be more than 500ms, and as far as a power frequency period 20ms, normalized current is metastable.The present invention is continuous to the Signal Processing process, and the entire process process is no more than 1ms, and processing speed is exceedingly fast, and result can satisfy the needs of engineering.
(2) this device is to realize making stable to electric current the electric current in the load consistent with normalized current, thereby reach the steady state (SS) of load current through the standard of changing electric current.Current stability, and the waveform distortion administered through this device all can reach more than 1%.
(3) this device applied range, its capacity can need to select voluntarily based on the user, and the user can adapt to the needs of load current through the replacing standard.
In sum, this device has environmental protection, high-quality, characteristics such as efficient, quick, has the effect of stable alternating current.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is the installation site synoptic diagram of current transformer, first coupling transformer.
Fig. 3 is the circuit theory diagrams of comparer of the present invention.
Fig. 4 is the circuit theory diagrams of fixed voltage amplifier.
In Fig. 1-4, the model of IC1-IC4 is: μ A741, A are the A phase of three-phase alternating-current supply, and N is the zero line of three-phase alternating-current supply, U
x: be the voltage (i.e. the output voltage of second current/voltage converter) of normalized current behind second current/voltage converter that standard current generator produces, U
y: be the voltage (i.e. the output voltage of first current/voltage converter) of load current behind first current/voltage converter of current transformer sampling, U
Xy: be the output voltage of comparer, U
In: mains supply voltage, U1: after load is departed from current processing, again by first coupling transformer coupling, so that the voltage on the formation branch road parallelly connected with load, IBQ: standard current generator, I
b: normalized current.
Embodiment
Embodiment by shown in Fig. 1-4 can know that it is made up of current transformer, first current/voltage converter, standard current generator, second current/voltage converter, comparer, fixed voltage amplifier, first coupling transformer; Elementary and the load of said current transformer is connected; The secondary input end that connects first current/voltage converter of said current transformer; An input end of the said comparer of output termination of said first current/voltage converter, the output voltage of said first current/voltage converter is U
yThe input end of said second current/voltage converter of output termination of said standard current generator, the output voltage of said second current/voltage converter is U
x, another input end of the said comparer of output termination of said second current/voltage converter, the output voltage of said comparer is U
XyThe output voltage U of said comparer
XyOutput voltage U with said second current/voltage converter
xConnect said fixed voltage amplifier input terminal after the series connection; Said first coupling transformer of output termination of said fixed voltage amplifier elementary, the secondary two ends that are connected in parallel on by the elementary branch road that is composed in series of said load and current transformer of said first coupling transformer.
Said current transformer is T4, and the elementary L1 of current transformer T4 connects with load Z; Said first current/voltage converter is made up of resistance R 11; Resistance R 11 and an end ground connection after the secondary L2 of current transformer T4 is parallelly connected, its other end is the E point; Said second current/voltage converter is made up of resistance R 12; Resistance R 12 and an end ground connection after said standard current generator IBQ is parallelly connected, its other end is the D point.
Said comparer is made up of operational amplifier IC1, resistance R 13-R16; Positive input 3 pin of operational amplifier IC1 connect said D point through resistance R 14; Negative input 2 pin of operational amplifier IC1 connect said E point through resistance R 13; Resistance R 15 is connected between 3 pin and ground of operational amplifier IC1; Resistance R 16 is connected between 6 pin and 2 pin of operational amplifier IC1, and the output voltage of operational amplifier IC1 is U
Xy
Said fixed voltage amplifier is made up of the first reverse voltage amplifier, phase shifter, the second reverse voltage amplifier, power amplifier; The output terminal of the first reverse voltage amplifier connects the input end of power amplifier successively through phase shifter, the second reverse voltage amplifier; The said first coupling transformer T6's of the output termination of said power amplifier is elementary, and the elementary center tap of the first coupling transformer T6 meets V
Cc1The said first reverse voltage amplifier is made up of operational amplifier IC2, resistance R 23-R24, potentiometer RW1; The output voltage U of said comparer
XyOutput voltage U with said second current/voltage converter
xOne end of the branch road after the series connection connects negative input 2 pin of operational amplifier IC2, the other end ground connection of said branch road through resistance R 23; Resistance R 24 is connected between positive input 3 pin and ground of operational amplifier IC2, and potentiometer RW1 is connected between 6 pin and 2 pin of operational amplifier IC2; Said phase shifter is made up of operational amplifier IC3, resistance R 25-R26, potentiometer RW2, capacitor C 2; Negative input 2 pin of operational amplifier IC3 connect output terminal 6 pin of operational amplifier IC2 through resistance R 25; Capacitor C 2 be connected between output terminal 6 pin and ground of operational amplifier IC2 after potentiometer RW2 connects; The end ground connection of potentiometer RW2, positive input 3 pin of operational amplifier IC3 connect the node of capacitor C 2 and potentiometer RW2; Resistance R 26 is connected between 6 pin and 2 pin of operational amplifier IC3; The said second reverse voltage amplifier is made up of operational amplifier IC4, resistance R 27-R28, potentiometer RW3; Negative input 2 pin of operational amplifier IC4 connect output terminal 6 pin of operational amplifier IC3 through resistance R 27, and resistance R 28 is connected between positive input 3 pin and ground of operational amplifier IC4, and potentiometer RW3 is connected between 6 pin and 2 pin of operational amplifier IC4; Said power amplifier is the push-pull amplifier of being made up of transistor Q1-Q2, the second coupling transformer T5, resistance R 29-R31; The second coupling transformer T5 elementary is connected between output terminal 6 pin and ground of operational amplifier IC4; The secondary base stage that meets transistor Q1 and transistor Q2 respectively of the second coupling transformer T5, the center tap of T5 level of second coupling transformer meets Vcc through resistance R 29 and resistance R 30 respectively
1And ground; The emitter parallel connection of transistor Q1 and transistor Q2 is after resistance R 31 ground connection; The collector of transistor Q1 and transistor Q2 connects the elementary of the said first coupling transformer T6 respectively, and the elementary center tap of the said first coupling transformer T6 meets V
Cc1, the branch road parallel connection of forming after the elementary L1 secondary and by load Z summation current transformer T4 of the said first coupling transformer T6 connects.
Principle of work of the present invention is following:
When if single-phase AC voltage is added in the load two ends, in load, will have alternating current to flow through, its size and waveform are relevant with institute's making alive and impedance property, the electric current that flows through load actual current I
sI
sForm by two parts: promptly supply current I
g, produce U1 and I
sThe electric current of middle change opposite current is departing from electric current I
P, I
s=I
g+ I
PTo depart from electric current I
PAfter this device electronic processing, become corresponding offset voltage U1, above-mentioned offset voltage U1 is added in the two ends of load Z, this moment, offset voltage U1 provided one and I for load Z
sThe current canceling of change opposite current the part that electric current changes in the load current, thereby reached the stable of load current.
Specific practice is: be a normalized current I
b(see figure 3) makes I
b=I
s, and make I
bIdentical with the supply voltage frequency, waveform stabilization, phase stabilization, amplitude stability.With this normalized current I
bConvert voltage U to through the second current/voltage converter R12
xWith I
sAfter 1: 1 current transformer T4 sampling, convert voltage U to through the first current/voltage converter R11 again
yWith U
xWith U
ySend into the comparer (see figure 3) simultaneously, the positive input of IC1 meets U through resistance R 14
x, its negative input meets U through resistance R 13
y, the voltage of comparer output is offset voltage U
Xy, with U
XyWith U
xResult after the stack is as the input signal (see figure 4) of fixed voltage amplifier.The total magnification of fixed voltage amplifier is α times, and phase shifting angle is γ, and the no-load voltage ratio of the first coupling transformer T6 is 1: 1.
Work as U
Xy=0 o'clock, only remaining U
xWhen adjustment fixed voltage amplifier amplification quantity is that α and phase shifting angle are that γ makes the output voltage U 1 of fixed voltage amplifier and the supply voltage U of load Z
InCan realize U1 and U when identical
InParallel connection, this moment U1 and U
InParallel connection is load Z power supply simultaneously, but U1 this moment provides electric current for load Z, just look like generator in the electrical network just be incorporated into the power networks do not generate electricity the same.
Work as U
Xy≠ 0 o'clock, said output voltage U 1 will be done corresponding variation, and U1 is that load provides one and I
sThereby the electric current of change opposite current has been realized the stable of load current.
The present invention has following electric current abatement functions:
This device has played the effect of stable alternating current: when having only active current in the load circuit, be a normalized current I
bMake it equal actual current I
s, with normalized current I
bSend into second current/voltage converter and convert U into
x, again with actual current I
sElectric current after the sampling converts voltage U to through first current/voltage converter
y, as shown in Figure 3, with U
x, U
ySend into the input end of comparer simultaneously; This moment, the IC1 output voltage was U
Xy, U
XyWith U
xSend into the fixed voltage amplifier input terminal after the stack, then said output voltage U 1 changes, and its result causes the change electric current in the load to do opposite variation, so the electric current in the load has obtained stable.Played the effect of alternating current stabilizator.
Claims (1)
1. the device of a fast and stable alternating current in a power frequency period is characterized in that it is made up of current transformer, first current/voltage converter, standard current generator, second current/voltage converter, comparer, fixed voltage amplifier, first coupling transformer; Elementary and the load of said current transformer is connected; The secondary input end that connects first current/voltage converter of said current transformer; An input end of the said comparer of output termination of said first current/voltage converter, the output voltage of said first current/voltage converter is U
yThe input end of said second current/voltage converter of output termination of said standard current generator, the output voltage of said second current/voltage converter is U
x, another input end of the said comparer of output termination of said second current/voltage converter, the output voltage of said comparer is U
XyThe output voltage U of said comparer
XyOutput voltage U with said second current/voltage converter
xConnect said fixed voltage amplifier input terminal after the series connection; Said first coupling transformer of output termination of said fixed voltage amplifier elementary, the secondary two ends that are connected in parallel on by the elementary branch road that is composed in series of said load and current transformer of said first coupling transformer;
The normalized current of said standard current generator is the electric current of degree of stability more than 500ms of manual manufacture;
Said current transformer is T4, and the elementary L1 of current transformer T4 connects with load Z; Said first current/voltage converter is made up of resistance R 11; Resistance R 11 and an end ground connection after the secondary L2 of current transformer T4 is parallelly connected, its other end is the E point; Said second current/voltage converter is made up of resistance R 12; Resistance R 12 and an end ground connection after said standard current generator IBQ is parallelly connected, its other end is the D point;
Said comparer is made up of operational amplifier IC1, resistance R 13-R16; Positive input 3 pin of operational amplifier IC1 connect said D point through resistance R 14; Negative input 2 pin of operational amplifier IC1 connect said E point through resistance R 13; Resistance R 15 is connected between 3 pin and ground of operational amplifier IC1; Resistance R 16 is connected between 6 pin and 2 pin of operational amplifier IC1, and the output voltage of operational amplifier IC1 is U
Xy
Said fixed voltage amplifier is made up of the first reverse voltage amplifier, phase shifter, the second reverse voltage amplifier, power amplifier; The output terminal of the first reverse voltage amplifier connects the input end of power amplifier successively through phase shifter, the second reverse voltage amplifier; The said first coupling transformer T6's of the output termination of said power amplifier is elementary, and the elementary center tap of the first coupling transformer T6 meets V
Cc1The said first reverse voltage amplifier is made up of operational amplifier IC2, resistance R 23-R24, potentiometer RW1; The output voltage U of said comparer
XyOutput voltage U with said second current/voltage converter
xOne end of the branch road after the series connection connects negative input 2 pin of operational amplifier IC2, the other end ground connection of said branch road through resistance R 23; Resistance R 24 is connected between positive input 3 pin and ground of operational amplifier IC2, and potentiometer RW1 is connected between 6 pin and 2 pin of operational amplifier IC2; Said phase shifter is made up of operational amplifier IC3, resistance R 25-R26, potentiometer RW2, capacitor C 2; Negative input 2 pin of operational amplifier IC3 connect output terminal 6 pin of operational amplifier IC2 through resistance R 25; Capacitor C 2 be connected between output terminal 6 pin and ground of operational amplifier IC2 after potentiometer RW2 connects; The end ground connection of potentiometer RW2, positive input 3 pin of operational amplifier IC3 connect the node of capacitor C 2 and potentiometer RW2; Resistance R 26 is connected between 6 pin and 2 pin of operational amplifier IC3; The said second reverse voltage amplifier is made up of operational amplifier IC4, resistance R 27-R28, potentiometer RW3; Negative input 2 pin of operational amplifier IC4 connect output terminal 6 pin of operational amplifier IC3 through resistance R 27, and resistance R 28 is connected between positive input 3 pin and ground of operational amplifier IC4, and potentiometer RW3 is connected between 6 pin and 2 pin of operational amplifier IC4; Said power amplifier is the push-pull amplifier of being made up of transistor Q1-Q2, the second coupling transformer T5, resistance R 29-R31; The second coupling transformer T5 elementary is connected between output terminal 6 pin and ground of operational amplifier IC4; The secondary base stage that meets transistor Q1 and transistor Q2 respectively of the second coupling transformer T5, the center tap of T5 level of second coupling transformer meets V through resistance R 29 and resistance R 30 respectively
Cc1And ground; The emitter parallel connection of transistor Q1 and transistor Q2 is after resistance R 31 ground connection; The collector of transistor Q1 and transistor Q2 connects the elementary of the said first coupling transformer T6 respectively, and the elementary center tap of the said first coupling transformer T6 meets V
Cc1, the branch road parallel connection of forming after the elementary L1 secondary and by load Z summation current transformer T4 of the said first coupling transformer T6 connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101814668A CN101866192B (en) | 2010-05-25 | 2010-05-25 | Device for fast stabilizing alternating current in power frequency period |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101814668A CN101866192B (en) | 2010-05-25 | 2010-05-25 | Device for fast stabilizing alternating current in power frequency period |
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| Publication Number | Publication Date |
|---|---|
| CN101866192A CN101866192A (en) | 2010-10-20 |
| CN101866192B true CN101866192B (en) | 2012-05-30 |
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|---|---|---|---|
| CN2010101814668A Expired - Fee Related CN101866192B (en) | 2010-05-25 | 2010-05-25 | Device for fast stabilizing alternating current in power frequency period |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339719C (en) * | 2005-06-09 | 2007-09-26 | 深圳市滨江电子科技有限公司 | Method for measuring phase sequence through sampling three-phases AC in slicing time |
| WO2008068834A1 (en) * | 2006-12-05 | 2008-06-12 | Panasonic Corporation | Apparatus for stabilizing power supply of heater housing box cooling apparatus |
| CN101262129A (en) * | 2008-04-24 | 2008-09-10 | 南京因泰莱配电自动化设备有限公司 | Current protection control method and device for 24kV vacuum breaker |
-
2010
- 2010-05-25 CN CN2010101814668A patent/CN101866192B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339719C (en) * | 2005-06-09 | 2007-09-26 | 深圳市滨江电子科技有限公司 | Method for measuring phase sequence through sampling three-phases AC in slicing time |
| WO2008068834A1 (en) * | 2006-12-05 | 2008-06-12 | Panasonic Corporation | Apparatus for stabilizing power supply of heater housing box cooling apparatus |
| CN101262129A (en) * | 2008-04-24 | 2008-09-10 | 南京因泰莱配电自动化设备有限公司 | Current protection control method and device for 24kV vacuum breaker |
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| Publication number | Publication date |
|---|---|
| CN101866192A (en) | 2010-10-20 |
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Granted publication date: 20120530 Termination date: 20130525 |