CN108023368A - A kind of Auto-matching resonance based on current transformer takes electric DC source - Google Patents
A kind of Auto-matching resonance based on current transformer takes electric DC source Download PDFInfo
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- CN108023368A CN108023368A CN201810032102.XA CN201810032102A CN108023368A CN 108023368 A CN108023368 A CN 108023368A CN 201810032102 A CN201810032102 A CN 201810032102A CN 108023368 A CN108023368 A CN 108023368A
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- 239000004065 semiconductor Substances 0.000 claims abstract description 91
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- H02J5/005—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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Abstract
The present invention relates to a kind of Auto-matching resonance based on current transformer to take electric DC source, it includes current transformer（T1）, compensating electric capacity（C1）, H-bridge circuit, filter capacitor（C2）, load（X1）And control unit.Current transformer（T1）With compensating electric capacity（C1）Parallel connection, and be connected with H-bridge circuit input terminal；H-bridge circuit output terminal and filter capacitor（C2）, load（X1）It is in parallel；Control unit adjusts input reactive current and DC output voltage by controlling the grid of metal-oxide-semiconductor Q1, Q2, Q3, Q4 of H-bridge circuit.Technical scheme not only greatly improves mutual inductor power-supply circuit output power at low currents, substantially reduces the current transformer for taking electricity（T1）Volume, effectively reduce mutual inductor manufacture cost, and Auto-matching resonance is reached by the switch of H-bridge circuit, in the case of same cable current, further improve the output power of DC source, and DC source output is more stablized, and improves mutual inductor service life.
Description
Technical field
The present invention relates to Current Mutual Inductance and power electronics field, and in particular to a kind of based on the automatic of current transformer
Matching resonance takes electric DC source.
Background technology
With Process of Urbanization Construction and the fast development of power industry, power grid coverage expands day by day, and high-tension cable is
As the chief component of power grid.Increasing high voltage overhead cable and the normal operation of high pressure subterranean cable are to maintain electricity
The necessary condition that Force system is stablized.On-line monitoring is carried out to its operation conditions becomes the important ring for improving electric network reliability
Section.In cable operation monitoring system, the design of power supply is one of emphasis and difficult point.Particularly in underground hoistway
Or remote districts cannot generally provide 220V electric mains, and it is too big to use photovoltaic battery panel power supply to be influenced by ambient weather,
Therefore it is a kind of relatively stable reliable power supply mode using being influenced small mutual inductor directly to take electricity from high-tension cable by weather.
The Chinese invention patent of Patent No. 200910045470.9 discloses one kind and takes power supply based on transformer induced,
Its structure such as Fig. 1, current transformer output current pass through a voltage-stablizer or DC/DC electricity after diode full-bridge rectifier filter
Source exports constant voltage.Current transformer is special transformer, its circuit model can be represented with transformer, high-tension cable
Line is equivalent to ac current source, equivalent circuit such as Fig. 2 of the circuit.IsFor primary current conversion to the current value of secondary, i.e. Is=
I0/ n, wherein, I0For primary current, n is the ratio of the secondary number of turn and the primary side number of turn, and the number of turn of primary side high-voltage cable is 1；
LrFor mutual inductor leakage inductance, LmFor mutual inductor magnetizing inductance.According to Fig. 2, when power supply output no-load, the pressure drop on magnetizing inductance is 2
πfLmIs, rectification circuit output DC voltage beWhen Output Voltage in Rectified Circuits reaches UsWhen, primary side cable
Starting current is：
The advantages of this mode is：Rectifier bridge uses uncontrollable diode, simple in structure, it is not necessary to complicated control list
The design of member.But the shortcomings that this mode, is more obvious：The inductance value one of the equivalent magnetizing inductance of primary current mutual inductor
As in hundreds of milihenries, the sensing electric current obtained by current transformer from primary side, it is most of in the form of reactive current from excitation
Flowed through on inductance.DC voltage after rectifier bridge, after access loads, the active power produced in load will be much smaller than
Reactive power on magnetizing inductance.In the case of showing that cable current is low, DC source can not export enough active power.
In the case that the secondary number of turn is constant, traditional mutual inductor power-supply circuit can only be by increasing the method for magnetizing inductance, i.e. increase is mutual
Sensor core volume, to reduce starting current, so as to fulfill output voltage Us.This mode not only has what the production cost increases
Problem, and when cable current is larger, the magnetic core of current transformer is easily saturated, the service life and DC source to magnetic core it is steady
It is qualitative to have large effect.The method of this inactive rectification bridge there is also an issue, the DC voltage amplitude of rectification output
The relation being positively correlated with cable current size, thus output voltage easily by cable current fluctuation influenced, output power it is steady
Qualitative difference.
The Chinese invention patent of Patent No. 201310206669.1 discloses one kind and takes electricity based on current transformer resonance
DC source design method, its structure chart such as Fig. 3, by current transformer output terminal parallel resonance capacitance, making the humorous of parallel connection
Shake capacitance and current transformer magnetizing inductance resonance, under identical high voltage side current effect, can make the electric energy of sensing acquisition
Increase；Particularly when high voltage side current is smaller, it can ensure that sensing is got enough electric energy and used for load, to improve direct current
The stability of source output power.The shortcomings that inactive rectification bridge that this method solves resonance free well takes electric DC source.But
That this method is in practical application, since the error of mutual inductor magnetizing inductance is very big so that resonant capacitance and magnetizing inductance without
Method accurately matches, and have impact on and takes electrical efficiency.
The content of the invention
The present invention provides a kind of Auto-matching resonance and takes power supply, capacitance can be not required accurately to be matched with magnetizing inductance
In the case of, Maximum Power Output, thus technical problem existing for above-mentioned two patents can be fully solved.
To achieve these goals, the Auto-matching resonance of the invention based on current transformer takes electric DC source using such as
Lower technical solution.
The Auto-matching resonance based on current transformer of the present invention takes electric DC source, including current transformer T1, also wraps
Include compensating electric capacity C1, H-bridge circuit, filter capacitor C2, load X1 and control unit：
The current transformer T1 is used to obtain through the sensing electric current on the high-tension cable of its magnetic core；
The compensating electric capacity C1 is used for the reactive current inside the compensation current transformer T1 of part, to improve by sensing electric current
The lower voltage produced of excitation；
The H-bridge circuit is connected and composed by four metal-oxide-semiconductors Q1, Q2, Q3, Q4, for part compensation current transformer T1's
Reactive current, while AC energy is converted into direct current energy output；
The load X1 is used for the electric energy confessed to outside；
The current transformer T1 is connected in parallel with the compensating electric capacity C1, and is connected with the input terminal of H-bridge circuit；It is described
The output terminal of H-bridge circuit is connected in parallel with the filter capacitor C2, the load X1；
Described control unit is used for by the grid of metal-oxide-semiconductor Q1, Q2, Q3, Q4 for controlling H-bridge circuit, to adjust input nothing
Work(electric current and DC output voltage.
Preferably, the equivalent magnetizing inductance Lm of secondary of the compensating electric capacity C1 and current transformer T1, and induced electricity
Frequency f is flowed, meets the following conditions：
In any of the above-described technical solution preferably, switch motion is once in a current cycle for the H-bridge circuit
Or repeatedly.
In any of the above-described technical solution preferably, the H-bridge circuit is by four metal-oxide-semiconductors with anti-simultaneously diode
Q1, Q2, Q3, Q4 are formed, wherein：The drain electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2 and is the positive output end of H-bridge circuit,
The source electrode of metal-oxide-semiconductor Q3 is connected with the source electrode of metal-oxide-semiconductor Q4 and is the negative output terminal of H-bridge circuit.
In any of the above-described technical solution preferably, the H-bridge circuit is by four metal-oxide-semiconductors with anti-simultaneously diode
Q1, Q2, Q3, Q4 are formed, wherein：The source electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q4 and is the positive input terminal of H-bridge circuit,
The source electrode of metal-oxide-semiconductor Q2 is connected with the drain electrode of metal-oxide-semiconductor Q3 and is the negative input end of H-bridge circuit.
In any of the above-described technical solution preferably, the grid of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor Q3
The switch controlling signal that the equal reception control unit of the grid of pole and metal-oxide-semiconductor Q4 provides.
In any of the above-described technical solution preferably, described control unit gathers two metal-oxide-semiconductors Q3, Q4 of H-bridge circuit
Electric current iQ3、iQ4With output voltage U1, control signal S1, S2, S3, S4 of H-bridge circuit are exported after internal algorithm calculates, is divided
Not Kong Zhi H-bridge circuit four metal-oxide-semiconductors Q1, Q2, Q3, Q4 break-make.
In any of the above-described technical solution preferably, described control unit controls four according to following switch-control strategy
The break-make of metal-oxide-semiconductor Q1, Q2, Q3, Q4：Metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3 are switched on or off at the same time；Metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q4 are opened at the same time
Logical or shut-off.
In any of the above-described technical solution preferably, according to control unit to four metal-oxide-semiconductor Q1, Q2, Q3, Q4 break-makes
Switch-control strategy, in the case of metal-oxide-semiconductor Q1~Q4 is all off, when switching tube Q3 electric current from zero be changed on the occasion of when, immediately
S1 and S3 are set to high level, open metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3, the ON time T of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3 are according to inside it
Algorithm determines.
In any of the above-described technical solution preferably, according to control unit to four metal-oxide-semiconductor Q1, Q2, Q3, Q4 break-makes
Switch-control strategy, in the case of metal-oxide-semiconductor Q1~Q4 is all off, when switching tube Q4 electric current from zero be changed on the occasion of, immediately will
S2 and S4 are set to high level, open metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q4, and the ON time T of metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q4 internal is calculated according to it
Method determines.
In any of the above-described technical solution preferably, the ON time T of n-th of cycle metal-oxide-semiconductor Q1~Q4nPass through disturbance
Method is adjusted：
Maximum ON time T is determined firstmaxWith minimum ON time Tmin, it is desirable to Tmax≥Tn≥Tmin, during circuit start
Set T0=Tmin；
The ON time T in (n+1)th cyclen+1With the ON time T in n-th of cyclenBetween relation be：Tn+1=Tn+Δ
T or Tn+1=Tn- Δ T, wherein Δ T are adjusting step-length；
TnChange in a direction, and calculate the output power in former and later two cycles, output power becomes larger after such as changing, then
Continue to change by current trend；Output power diminishes after such as changing, then inverse change, until Maximum Power Output.
The Auto-matching resonance based on current transformer of the present invention takes electric DC source, passes through compensating electric capacity C1 parts first
The reactive power of the equivalent magnetizing inductance of compensation current transformer T1 and the H-bridge circuit of four metal-oxide-semiconductor compositions pass through method of perturbation
Control strategy achievees the purpose that automatic, accurate matching resonance.Therefore, technical scheme is not only able to greatly improve
The output power of mutual inductor power-supply circuit at low currents, substantially reduces the volume for the current transformer T1 for taking electricity, and
And Auto-matching resonance can be reached by the switch of H-bridge circuit, in the case of same cable current, further improve direct current
The output power in source, and the output of DC source is more stablized.
Compared to the technical solution of two patents described in background technology, automatic based on current transformer of the invention
The technical solution for taking electric DC source with resonance has the advantage that：Under identical high voltage side current effect, resonance takes the mode of electricity than straight
The mode of resonance free diode rectification was connected, the electric energy for sensing acquisition greatly increases, can be in the high-pressure side of smaller electricity when special
Flow down startup；The mode of Auto-matching resonance, can be by the switch of H-bridge circuit, the electric current caused by different high voltage side currents
In the case of the magnetizing inductance change of mutual inductor, dynamic compensates resonance, and the electric energy of acquisition is maximized.This mode energy of the present invention
Enough technologies for improving and solving present in the technical solution provided as the Chinese invention patent of Patent No. 201310206669.1
Magnetizing inductance all difference of defect --- the different current transformers under the effect of different high voltage side currents, by indivedual electricity
The magnetizing inductance of current transformer carries out the capacitance that accurate resonance matches and is not applied for all current transformers.
The above-mentioned technical proposal of the present invention is employed, since mutual inductor takes the raising of electrical efficiency, may be such that current transformer
Volume reduce, effectively reduce mutual inductor manufacture cost.By internal algorithm Dynamic Matching resonance, make the output of DC source more
Stablize, improve mutual inductor service life.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is in the prior art based on the transformer induced circuit structure diagram for taking power supply；
Fig. 2 is the equivalent circuit diagram based on the transformer induced circuit for taking power supply shown in Fig. 1；
Fig. 3 is the circuit structure diagram for the DC source for taking electricity based on current transformer resonance in the prior art；
Fig. 4 Auto-matching resonance according to the invention based on current transformer takes the one excellent of the circuit structure of electric DC source
Select the schematic diagram of embodiment；
Fig. 5 is the one of the control sequential that the Auto-matching resonance according to the invention based on current transformer takes electric DC source
The schematic diagram of preferred embodiment.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
In order to overcome mutual inductor high pressure to take electricity the problems of in the prior art, the embodiment of the present invention proposes a kind of base
Electric DC source is taken in the Auto-matching resonance of current transformer, its circuit includes current transformer, compensating electric capacity, H bridges, filtering
Capacitance, load and control unit.H bridges are controlled to turn on and off by control unit, Auto-matching electricity when making the circuit work
The equivalent magnetizing inductance of current transformer and produce parallel resonance so that the electric energy that sensing is obtained largely changes into DC source
Output.In the case of the low current of high-pressure side, by parallel resonance, it is ensured that the electric energy that sensing is got makes for load enough
With；In the case of the high current of high-pressure side, for protective current mutual inductor, the compensation even cancelled for magnetizing inductance is reduced,
To avoid under the current transformer voltage condition excessive in parallel resonance, CT saturation causes the longevity of current transformer
Life shortens.So the embodiment of the present invention has the following advantages：
1st, the volume of current transformer reduces, and the cost of manufacture of current transformer greatly reduces；
2nd, in the case of the high current of high-pressure side, make operation of current transformers in unsaturated state, extend the service life of magnetic core；
3rd, by way of Auto-matching resonance, make different current transformers is equivalent under different high voltage side currents to swash
Magnetoelectricity sense is accurately matched into Mobile state, the output by the energy that mutual inductor obtains mostly as DC source.The energy of DC source
Utilization rate is high, stable output power.
The design principle and control method of the embodiment of the present invention are explained and verified to Fig. 5 below in conjunction with Fig. 4.
The Auto-matching resonance based on current transformer described in the present embodiment takes electric DC source, as shown in figure 4, its circuit
Include current transformer T1, compensating electric capacity C1, H-bridge circuit, filter capacitor C2, load X1 and control unit.Circuit connection is closed
System：Current transformer T1 is connected in parallel with compensating electric capacity C1, and is connected with the input terminal of H-bridge circuit；The output terminal of H-bridge circuit with
Filter capacitor C2, load X1 are connected in parallel.
Current transformer T1 is used to obtain through the sensing electric current on the high-tension cable of its magnetic core；In this implementation, electric current is mutual
The secondary number of turn of sensor T1 is 400 circles, magnetizing inductance Lm is 500mH.
Compensating electric capacity C1 is used for the reactive current inside the compensation current transformer T1 of part, to improve by sensing current excitation
The voltage of lower generation；Under conditions of cable current frequency f=50Hz and the equivalent magnetizing inductance 500mH of current transformer, using 3
After the CBB electric capacity parallel connection of a 4.7uF/400V, then the output-parallel with current transformer T1.
Compensating electric capacity C1 and magnetizing inductance L1 meet condition of resonance：
For H-bridge circuit by four with anti-and diode metal-oxide-semiconductor Q1, Q2, Q3 and Q4 group, it is mutual that it is used for part compensation electric current
The reactive current of sensor T1, while AC energy is converted into direct current energy output.
H-bridge circuit switch motion in a current cycle is one or many.
Load X1 is used for the electric energy confessed to outside.
Control unit is used for by the grid of metal-oxide-semiconductor Q1, Q2, Q3, Q4 for controlling H-bridge circuit, and idle electricity is inputted to adjust
Stream and DC output voltage.
The Auto-matching resonance based on current transformer described in the present embodiment takes electric DC source, and four with anti-and two poles
Metal-oxide-semiconductor Q1, Q2, Q3 and Q4 composition H-bridge circuit of pipe, wherein：The drain electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2 and is H bridges
The positive output end of circuit, the source electrode of metal-oxide-semiconductor Q3 are connected with the source electrode of metal-oxide-semiconductor Q4 and are the negative output terminal of H-bridge circuit；Metal-oxide-semiconductor Q1
Source electrode be connected with the drain electrode of metal-oxide-semiconductor Q4 and for the positive input terminal of H-bridge circuit, the source electrode of metal-oxide-semiconductor Q2 and the drain electrode phase of metal-oxide-semiconductor Q3
Even and it is the negative input end of H-bridge circuit.The grid of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4
The switch controlling signal that the equal reception control unit of grid provides.Four NMOS tube Q1~Q4 use IRF740.H-bridge circuit outlet side
Both ends are parallel with filter capacitor C2, and filter capacitor C2 uses the electrolytic capacitor of 220uF/400V.
Electric current iQ3, iQ4 and output voltage U1 of two down tubes Q3, Q4 of control unit collection H-bridge circuit, through inside it
Algorithm calculate after export H-bridge circuit control signal S1, S2, S3, S4, come control respectively the four of H-bridge circuit metal-oxide-semiconductor Q1, Q2,
The break-make of Q3, Q4, as shown in Figure 5.Control strategy is：Q1 and Q3 are switched on or off at the same time；Q2 and Q4 are switched on or off at the same time.
In the case of metal-oxide-semiconductor Q1~Q4 is all off, when switching tube Q3 electric current from zero be changed on the occasion of when, S1 and S3 are set to high electricity immediately
It is flat, open Q1 and Q3, the ON time T of Q1 and Q3 are determined according to its internal algorithm；In the case of Q1~Q4 is all off, when opening
The electric current of pipe Q4 is closed from zero to be changed on the occasion of S2 and S4 are set to high level immediately, open the ON time T of Q2 and Q4, Q2 and Q4
Determined according to internal algorithm.
The ON time Tn of n-th of cycle Q1~Q4 is adjusted by method of perturbation：First determine maximum ON time Tmax with
Minimum ON time Tmin, it is desirable to which Tmax >=Tn >=Tmin, when circuit start set T0=Tmin；The conducting in (n+1)th cycle
Relation between time Tn+1 and the ON time Tn in n-th of cycle is：Tn+1=Tn+ Δ T or Tn+1=Tn- Δ T, wherein Δ T are
Adjust step-length.Tn changes in a direction, and calculates the output power in former and later two cycles, and output power becomes larger after such as changing,
Then continue to change by current trend；Output power diminishes after such as changing, then inverse change, until Maximum Power Output.
In specific implementation, control unit includes two operational amplifiers, a control module and a drive to the present embodiment
Dynamic model block；Wherein, the reverse input end of operational amplifier U1 receives the resistance alloys connected between the source electrode and ground of NMOS tube Q4
Terminal voltage on (100m Ω), control module is input a signal into after negative-feedback is amplified；Operational amplifier U2's is reverse defeated
Enter the terminal voltage on the resistance alloys (100m Ω) connected between the source electrode and ground of end reception NMOS tube Q3, amplify by negative-feedback
After input a signal into control module；The forward direction of operational amplifier UI and U2 are resistance eutral grounding of the input terminal by 1k Ω.Filtering
Ripple capacitance C2 both ends, according to 100k Ω：The ratio parallel resistance of 1k Ω, inputs the voltage at 11k Ω resistance both ends as signal
To control module.Four output terminals of control module are connected with four input terminals of drive module respectively, four of drive module
Grid of the output terminal respectively with NMOS tube Q1~Q4 is connected.In the embodiment of the present embodiment, comparator is using the double fortune of LM358 types
Calculate amplifier, control module use STM32F051 MCU chip, drive module using IR2101 types binary channels, raster data model,
The analog line driver of high-voltage high-speed.
When down tube Q3, Q4 of H-bridge circuit turns on, lower tube current iQ3 is more than zero, and control module is input to through operational amplifier
Voltage be more than zero；After control module detects rising edge, start timing, stop timing after detecting trailing edge.Repeated detection
The signal of electric current iQ3, takes the time of minimum as metal-oxide-semiconductor minimum ON time Tmin.Measurement H-bridge circuit is output to filter capacitor
The DC source output voltage of C2, by the DC source voltage of gradually more each signal period, as the foundation of disturbance adjusting method,
ON time is automatically adjusted, to reach the effect of peak power output.
The present embodiment dynamically switchs equivalent capacitance by compensating electric capacity C1 and H-bridge circuit, is connected in parallel on Current Mutual Inductance
The magnetizing inductance both ends of device, produce parallel resonance.Under situation of the different operation of current transformers in different high voltage side currents, its
Equivalent different magnetizing inductances, can pass through the Auto-matching resonance of the present invention well.As a result, equivalent magnetizing inductance
Impedance with compensating electric capacity and H bridge equivalent capacitys levels off to infinity.
When unloaded, the electric current that current transformer sensing produces is added on the equivalent resistance of current transformer.I.e. DC source is empty
Carrying output voltage isBy taking the magnetizing inductance of current transformer is 500Mh as an example, magnetizing inductance impedance is：Z=2 π fLm
=157 Ω, and the equivalent resistance of current transformer is generally at several kilohms.In the case of no resonance is matched, sensing obtains
Electric energy will exist mostly as the idle form on magnetizing inductance, only seldom electric energy can be output on filter capacitor
Using the output as DC source.The form that the electric energy overwhelming majority for sensing generation can be changed into active power by the present embodiment is made
For the output of DC source, greatly promote the utilization rate of energy.Therefore, under the operating mode of high-pressure side low current, DC source also can
Larger power is provided.
The above is only that the preferred embodiment of the present invention is described, and is not that the scope of the present invention is limited
It is fixed；The foregoing is merely the embodiment of the present invention, the protection domain being not intended to limit the present invention；Do not departing from
On the premise of design spirit of the present invention, what this area ordinary skill technical staff made technical scheme any repaiies
Change, equivalent substitution, improvement etc., should all fall into the protection domain that claims of the present invention determines.
Claims (10)
1. a kind of Auto-matching resonance based on current transformer takes electric DC source, including current transformer (T1), its feature to exist
In：It further includes compensating electric capacity (C1), H-bridge circuit, filter capacitor (C2), load (X1) and control unit,
The current transformer (T1) is used to obtain through the sensing electric current on the high-tension cable of its magnetic core；
The compensating electric capacity (C1) is used for the internal reactive current of part compensation current transformer (T1), to improve by sensing electric current
The lower voltage produced of excitation；
The H-bridge circuit is connected and composed by four metal-oxide-semiconductors Q1, Q2, Q3, Q4, the nothing for part compensation current transformer (T1)
Work(electric current, while AC energy is converted into direct current energy output；
The load (X1) is used for the electric energy confessed to outside；
The current transformer (T1) is connected in parallel with the compensating electric capacity (C1), and is connected with the input terminal of H-bridge circuit；It is described
The output terminal of H-bridge circuit is connected in parallel with the filter capacitor (C2), the load (X1)；
Described control unit is used for by the grid of metal-oxide-semiconductor Q1, Q2, Q3, Q4 for controlling H-bridge circuit, and idle electricity is inputted to adjust
Stream and DC output voltage.
2. the Auto-matching resonance based on current transformer takes electric DC source as claimed in claim 1, it is characterised in that：It is described
Compensating electric capacity (C1) and the equivalent magnetizing inductance Lm of secondary of current transformer (T1), and sensing power frequency f, meet following bar
Part：
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3. the Auto-matching resonance based on current transformer takes electric DC source as claimed in claim 1, it is characterised in that：It is described
H-bridge circuit switch motion in a current cycle is one or many.
4. the Auto-matching resonance based on current transformer takes electric DC source as claimed in claim 1, it is characterised in that：It is described
H-bridge circuit is formed by four with anti-and diode metal-oxide-semiconductor Q1, Q2, Q3, Q4, wherein：The drain electrode of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2
Drain electrode be connected and be connected with the source electrode of metal-oxide-semiconductor Q4 for the positive output end of H-bridge circuit, the source electrode of metal-oxide-semiconductor Q3 and be H-bridge circuit
Negative output terminal.
5. the Auto-matching resonance based on current transformer takes electric DC source as claimed in claim 1, it is characterised in that：It is described
H-bridge circuit is formed by four with anti-and diode metal-oxide-semiconductor Q1, Q2, Q3, Q4, wherein：The source electrode of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q4
Drain electrode be connected and be connected with the drain electrode of metal-oxide-semiconductor Q3 for the positive input terminal of H-bridge circuit, the source electrode of metal-oxide-semiconductor Q2 and be H-bridge circuit
Negative input end.
6. the Auto-matching resonance based on current transformer takes electric DC source as described in claim 4 or 5, it is characterised in that：
The grid of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q2, the equal reception control unit of the grid of the grid of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 provide
Switch controlling signal.
7. the Auto-matching resonance based on current transformer takes electric DC source as claimed in claim 6, it is characterised in that：It is described
The electric current i of two metal-oxide-semiconductors Q3, Q4 of control unit collection H-bridge circuitQ3、iQ4With output voltage U1, after internal algorithm calculates
Control signal S1, S2, S3, S4 of H-bridge circuit are exported, controls the break-make of four metal-oxide-semiconductors Q1, Q2, Q3, Q4 of H-bridge circuit respectively.
8. the Auto-matching resonance based on current transformer takes electric DC source as claimed in claim 7, it is characterised in that：It is described
Control unit controls the break-make of four metal-oxide-semiconductors Q1, Q2, Q3, Q4 according to following switch-control strategy：Metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3 are same
When be switched on or off；Metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q4 are switched on or off at the same time.
9. the Auto-matching resonance based on current transformer takes electric DC source as claimed in claim 8, it is characterised in that：According to
Control unit is to the switch-control strategies of four metal-oxide-semiconductor Q1, Q2, Q3, Q4 break-makes, in the case of metal-oxide-semiconductor Q1~Q4 is all off,
When switching tube Q3 electric current from zero be changed on the occasion of when, S1 and S3 are set to high level immediately, open metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3,
The ON time T of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3 is determined according to its internal algorithm.
10. the Auto-matching resonance based on current transformer takes electric DC source as claimed in claim 8, it is characterised in that：Root
Switch-control strategy according to control unit to four metal-oxide-semiconductor Q1, Q2, Q3, Q4 break-makes, in all off situations of metal-oxide-semiconductor Q1~Q4
Under, when switching tube Q4 electric current from zero be changed on the occasion of, S2 and S4 are set to high level immediately, open metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q4,
The ON time T of metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q4 is determined according to its internal algorithm.
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