CN104901566B - Inverter and its control method - Google Patents

Inverter and its control method Download PDF

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Publication number
CN104901566B
CN104901566B CN201510078631.XA CN201510078631A CN104901566B CN 104901566 B CN104901566 B CN 104901566B CN 201510078631 A CN201510078631 A CN 201510078631A CN 104901566 B CN104901566 B CN 104901566B
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control signal
level
power source
converter
control
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CN104901566A (en
Inventor
陈汉威
游俊豪
刘家桦
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FSP Technology Inc
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FSP Technology Inc
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The invention discloses a kind of inverter, includes DC-DC converter, switcher for changing DC into AC and control circuit.Input power is converted to dc source by DC-DC converter to foundation control signal.Switcher for changing DC into AC is coupled to DC-DC converter, receiving dc source, and produces AC power according to dc source.Control circuit is coupled to DC-DC converter, to produce control signal according to reference power source and input power to control the operation of DC-DC converter, control signal is detected to produce testing result, and reference power source is controlled to adjust the responsibility cycle of control signal according to testing result.The inverter of the present invention is enabled to learn its working condition by the control signal of detecting primary side change-over circuit, and adaptively adjust signal level/responsibility cycle of control signal, therefore stable running can be maintained in intermittent mode, and be widely used among various energy conversion frameworks.

Description

Inverter and its control method
Technical field
The present invention relates to inverter, more particularly to one kind can detect the mode of operation of primary side change-over circuit with adaptability Ground adjusts the inverter and its control method of primary side control signal.
Background technology
Photovoltaic DC-to-AC converter (Photovoltaic inverter) is that the dc source for solar panel to be exported turns It is changed to AC power and exports to power network, the wherein primary side change-over circuit of photovoltaic DC-to-AC converter can be when low solar electric power exports Operate in depth intermittent mode (deep burst mode).Such as：(1) when the electric power that solar panel is exported is too small, meeting So that primary side change-over circuit can enter depth intermittent mode；And (2) when intensity of illumination is greatly reduced, solar panel Operating voltage can be in a low level with energy output, cause primary side change-over circuit to enter depth intermittent mode.
However, when primary side change-over circuit operates in depth intermittent mode, the internal circuit of photovoltaic DC-to-AC converter can because The out-put supply of primary side change-over circuit is insufficient and occurs abnormal or stops running, causes the damage of circuit unit.Therefore, it is necessary to The photovoltaic inverter state detecting circuit framework of a kind of innovation, to avoid the side effect caused by intermittent mode.
Therefore, it is necessary to which a kind of inverter and its control method solve above-mentioned problem to be present.
The content of the invention
The purpose of the present invention is to provide mode of operation that one kind can detect primary side change-over circuit with adaptively Adjust the inverter of primary side control signal.
Another object of the present invention is to provide mode of operation that one kind can detect primary side change-over circuit with adaptability The control method of the inverter of ground adjustment primary side control signal.
To achieve these goals, the invention provides a kind of inverter, comprising：
Circulate direct current transducer always, one input power is converted into a dc source according to a control signal；
One switcher for changing DC into AC, the DC-DC converter is coupled to, to receive the dc source, and An AC power is produced according to the dc source；And
One control circuit, the DC-DC converter is coupled to, the control circuit is to according to a reference power source And the input power produces the control signal to control the operation of the DC-DC converter, the control is believed Number detected to produce a testing result, and the reference power source is controlled to adjust the control according to the testing result One responsibility cycle of signal processed.
It is preferred that the control signal has one first level and one second level different from first level；With And when the DC-DC converter according to the control signal to operate in an intermittent mode when, the control signal can be held Continue and be in second level, and the control circuit detects the time that the control signal is continuously in second level To produce the testing result.
It is preferred that when the testing result, to indicate that the control signal is continuously in second level specific more than one During the time, the control circuit can adjust a voltage quasi position of the reference power source.
It is preferred that the control circuit is accurate to a voltage quasi position of the input power and a voltage of the reference power source Position makes comparisons to produce a comparative result, and produces the control signal according to the comparative result.
It is preferred that when the comparative result indicates that the voltage quasi position of the input power is less than the reference power source The voltage quasi position when, the DC-DC converter can operate in an intermittent mode according to the control signal.
It is preferred that the control circuit adjusts the voltage quasi position of the reference power source according to the testing result, To adjust the responsibility cycle of the control signal.
It is preferred that the control signal has one first level and one second level different from first level；When The DC-DC converter according to the control signal to operate in the intermittent mode when, the control signal can continue In second level, and when the testing result indicates that the control signal is continuously in second level and exceeded During one special time, the control circuit can reduce the voltage quasi position of the reference power source.
It is preferred that the control circuit can reduce the voltage quasi position of the reference power source until the control signal from Untill second level is converted to first level.
In order to realize another object of the present invention, the invention provides a kind of control method of inverter, wherein, it is described It is defeated by one that inverter includes circulation direct current transducer and a switcher for changing DC into AC, the DC-DC converter always It is a dc source to enter Power convert, and the dc source is converted to an AC power, institute by the switcher for changing DC into AC Control method is stated to include：
A control signal is produced according to a reference power source and the input power, to control the DC-DC to change The operation of device；
The control signal is detected to produce a testing result；And
The reference power source is controlled according to the testing result to adjust a responsibility cycle of the control signal.
It is preferred that the step of one reference power source of foundation and the input power are to produce a control signal includes：
One voltage quasi position of the input power is made comparisons to produce a ratio with a voltage quasi position of the reference power source Relatively result；And
The control signal is produced according to the comparative result.
It is preferred that when the comparative result indicates that the voltage quasi position of the input power is less than the reference power source The voltage quasi position when, the DC-DC converter can operate in the intermittent mode according to the control signal.
It is preferred that the reference power source is controlled according to the testing result to adjust the responsibility of the control signal The step of cycle, includes：
The voltage quasi position of the reference power source is adjusted according to the testing result, to adjust the control signal The responsibility cycle.
It is preferred that the control signal has one first level and one second level different from first level；When The DC-DC converter according to the control signal to operate in the intermittent mode when, the control signal can continue In second level；And when the testing result indicates that the control signal is continuously in second level and exceeded Included during one special time, the step of the voltage quasi position that the reference power source is adjusted according to the testing result：
Reduce the voltage quasi position of the reference power source.
It is preferred that the step of reducing the voltage quasi position of the reference power source, includes：
The voltage quasi position of the reference power source is reduced until the control signal is converted to institute from second level Untill stating the first level.
Compared with prior art, inverter of the invention can come by the control signal of detecting primary side change-over circuit Its working condition is learnt, and adaptively adjusts signal level/responsibility cycle of control signal, therefore can be maintained in intermittent mode Stable running, and be widely used among various energy conversion frameworks.
Brief description of the drawings
Fig. 1 is the structured flowchart of an embodiment of inverter of the present invention.
Fig. 2 is the signal waveforms of one of control signal shown in Fig. 1 specific implementation example.
Fig. 3 is the schematic diagram of one of inverter shown in Fig. 1 specific implementation example.
Fig. 4 is the local circuit schematic diagram of one of controller shown in Fig. 3 specific implementation example.
Fig. 5 is the signal waveforms of one of control signal shown in Fig. 3 specific implementation example.
【Symbol description】
100、300：Inverter
102：Solar cell
110、310：DC-DC converter
120：Switcher for changing DC into AC
130、330：Control circuit
322：LLC resonant converters
326：Drive circuit
332：Controller
336：Process circuit
DL、DR：Diode
R1、R2：Resistance
C：Electric capacity
VPV：Input power
VBUS：Dc source
VAC：AC power
VCMD：Reference power source
DR：Testing result
SC：Control signal
SD：Drive signal
VC1、VC2、VCA、VCB：Voltage quasi position
t0、t1、t2、t3、Ta、Tb、Tc、Td：Time
SCL：Left arm control signal
SCR：Right arm control signal
SDL：Left arm drive signal
SDR：Right arm drive signal
VC：Voltage
L1：First level
L2：Second level
Embodiment
In order that disclosed herein content can easily be understood, below especially exemplified by embodiment as the invention discloses The example that can actually implement according to this.In addition, all possible parts, use the group of identical label in schema and embodiment Part/component/step, represents same or like part.
Inversion framework provided by the present invention learns that primary side turns by the control signal of detecting primary side change-over circuit The working condition of circuit is changed, and the responsibility cycle of control signal is adaptively adjusted according to the result detected, therefore can be significantly Lift the flexibility ratio of inverter control and good circuit protection mechalusm is provided.For the ease of understanding the technical characteristic of the present invention, It is the specific implementation example for being used as the inverter of the present invention with photovoltaic DC-to-AC converter below, however, the inversion framework of the present invention It is not limited to photovoltaic DC-to-AC converter.Further instruction is as follows.
Referring to Fig. 1, its structured flowchart for an embodiment of inverter of the present invention.Inverter 100 is coupled to one Solar cell (Photovoltaic cell, PV cell) 102, and can be including (but not limited to) the direct current transducer that circulates always (direct current to direct current converter, DC/DC converter) 110, always circulation exchange Converter (direct current to alternating current converter, DC/AC converter) 120 and One control circuit 130.DC-DC converter 110 can receive the input power V that solar cell 102 is providedPV, and foundation One control signal SCBy input power VPVBe converted to a dc source VBUS(for example, DC bus-bar voltage).Direct current delivers circulation Parallel operation 120 is coupled to DC-DC converter 110, to receive dc source VBUS, and according to dc source VBUSTo produce One AC power VAC.In this embodiment (but the invention is not restricted to this), it is humorous that DC-DC converter 110 can include a LLC Formula of shaking converter (LLC resonant converter), improves conversion efficiency with the characteristic using its soft switching and drops Low EMI, and switcher for changing DC into AC 120 is also referred to as direct current and turns AC convertor (DC/AC inverter).
Control circuit 130 is coupled to DC-DC converter 110, to according to a reference power source VCMDAnd input power VPVTo produce control signal SCTo control the operation of DC-DC converter 110.For example (but the invention is not restricted to this), Control circuit 130 can be by reference power source VCMDWith input power VPVMake comparisons to produce control signal SC, and then control direct current to turn straight The operating frequency of stream transformer 110 and mode of operation (for example, normal mode or intermittent mode).In another example, control electricity Road 130 also can be to reference power source VCMDWith input power VPVNumerical operation is carried out to produce control signal SC。
In order to monitor the working condition of inverter 100 in real time, control circuit 130 separately can be to control signal SCLocated Reason/detection controls reference power source V to produce a testing result DR, and according to testing result DRCMD, and then adjust for controlling The control signal S of DC-DC converter 110 processedC.For example (but the invention is not restricted to this) please schemes together with Fig. 1 to refer to 2.Fig. 2 is the control signal S shown in Fig. 1COne of specific implementation example signal waveforms.Control signal SCCan have one first Level L1 and one second level L2 (being different from the first level L1), when DC-DC converter 110 is in control signal SCContinue During in the second level L2, then suspend Power convert operation (that is, operating in intermittent mode).Therefore, in control signal SC's Level can be adjusted by reference power source VCMDIn the case of to change, control circuit 130 can adjust ginseng according to testing result DR Examine power supply VCMDEnergy level, with switching signal SCLevel, and then adjust DC-DC converter 110 in real time in interval Operation during pattern, to prevent the abnormal electrical power supply of DC-DC converter 110.
In a specific implementation example, control circuit 130 also can control reference power source V according to testing result DRCMDTo adjust Whole control signal SCResponsibility cycle (duty cycle), and then control DC-DC converter 110 when intermittent mode Operation.In this specific implementation example, DC-DC converter 110 is in time point t1According to control signal SCTo operate in Intermittent mode, wherein DC-DC converter 110 are in time point t0~t1During open, and in time point t1~t2 During close.Further, since DC-DC converter 110 be continuously in closed mode overlong time can cause to power it is different Often, control circuit 130 can be continuously in time of closed mode to produce detection knot by detection DC-DC converter 110 Fruit DR.
In the intermittent mode, control circuit 130 is planned in time point t3DC-DC converter 110 is opened, however, Due to time point t1With time point t3Between time interval more than a special time (in this embodiment, equal to time point t1With Time point t2Between time interval), this will cause DC-DC converter 110 in time point t3It can power before different Often, therefore, when testing result DR indicates that DC-DC converter 110 is in the time closed more than the special time (also That is, control signal SCIt is continuously in the second level L2 and exceedes the special time) when, control circuit 130 can be by by reference power source VCMDVoltage quasi position VC1It is adjusted to voltage quasi position VC2, so that control signal SCIn advance in time point t2Switching signal level is to One level L1, now, DC-DC converter 110 will be in advance in time point t2Open.In other words, control circuit 130 can be by By adjustment reference power source VCMDVoltage quasi position VC1To change control signal SCResponsibility cycle, to reach control DC-DC The purpose on open and close opportunity of the converter 110 when intermittent mode.
In order to further appreciate that the technical characteristic of the present invention, this hair is further illustrated using a specific implementation example below The details of bright inverter, however, other circuit realiration frameworks based on the circuit framework shown in Fig. 1 are also feasible.It please join Fig. 3 is read, it is the schematic diagram of one of inverter 100 shown in Fig. 1 specific implementation example.It is inverse in this specific implementation example Become device 300 and include the switcher for changing DC into AC to circulate always shown in direct current transducer 310, a control circuit 330 and Fig. 1 120, the DC-DC converter 110 wherein shown in Fig. 1 can be respectively by DC-DC converter 310 with control circuit 130 Realized with control circuit 330.Control circuit 330 can be including (but not limited to) a controller 332 and a process circuit 336, its Middle controller 332 can be to control signal SCDetected to produce testing result DR, and produce/control according to testing result DR Reference power source VCMD, and process circuit 336 can be according to reference power source VCMDWith input power VPVTo produce control signal SC.Direct current turns Direct current transducer 310 can be including (but not limited to) a LLC resonant converters 322 and one drive circuit 326, wherein drive circuit 326 can be according to control signal S caused by control circuit 330CTo produce a drive signal SD, and LLC resonant converters 322 Can be according to drive signal SDBy input power VPVBe converted to dc source VBUS。
In this specific implementation example, LLC resonant converters 322 can include left arm switch and right arm switch (not It is illustrated in Fig. 3), wherein, left arm switch and right arm switch can be each made up of upper switch and lower switch, and the left arm is opened The control signal of two switches up and down closed is complementation, and the control signal of two switches up and down of right arm switch is also complementation.It is foregoing For the architecture of LLC resonant converters 322, due to the technology emphasis of the architecture non-invention, therefore, herein seldom Explain.In this specific implementation example, drive signal S that LLC resonant converters 322 are receivedDA left arm can be included to drive Dynamic signal SDLWith a right arm drive signal SDR, and control signal S caused by process circuit 336CA left arm can be included to control Signal SCLWith a right arm control signal SCR.On detecting control signal SCA specific implementation see Fig. 4.Fig. 4 is illustrated The local circuit schematic diagram of one of controller 332 shown in Fig. 3 specific implementation example.As shown in Figure 4, controller 332 can be by By detection electric capacity C voltage VCTo learn control signal SCInformation, wherein controller 332 can be via diode DL, resistance R1And Resistance R2To receive left arm control signal SCL, and via diode DR, resistance R1And resistance R2To receive and right arm control signal SCR.However, the signal acquisition framework shown in Fig. 4 is only to be needed for explanation, the limitation of the present invention is not used as.
Control circuit 330 can be to input power VPVA voltage quasi position and reference power source VCMDA voltage quasi position make comparisons To produce a comparative result, and according to the comparative result produce control signal SC(left arm control signal SCLControlled with right arm Signal SCR).For example, process circuit 336 can include a comparator (not being illustrated in Fig. 3), to carry out voltage quasi position Compare to produce the comparative result, process circuit 336 can produce control signal S according to the comparative resultC.Wherein, it is foregoing The function of comparator, it can also be reached by the controller circuitry that an operational amplifier, a resistance and an electric capacity are formed.By tune Whole control signal SCFrequency, responsibility cycle ... etc., make DC-DC converter 310 (LLC resonant converters 322) can In different solar energy output powers, operate under different patterns, such as normal mode or intermittent mode.In addition, in order to keep away Exempt from DC-DC converter 310 to be continuously in the overlong time of closed mode and cause abnormal electrical power supply, control circuit 330 can be according to Reference power source V is adjusted according to testing result DRCMDThe voltage quasi position to adjust control signal SC(for example, adjustment signal level And/or responsibility cycle).
For example, when testing result DR indicates that DC-DC converter 310 is continuously in the time of closed mode During more than a special time, control circuit 330 can reduce reference power source VCMDVoltage quasi position to adjust control signal SCResponsibility In the cycle, open DC-DC converter 310.Please Fig. 5 is referred to together with Fig. 3.Fig. 5 is the control signal S shown in Fig. 3CIt The signal waveforms of one specific implementation example.In this specific implementation example, DC-DC converter 310 is in time point Ta ~TbDuring open, and in time point Tb~TcDuring close.When DC-DC converter 310 is according to control signal SC(for example, intensity of illumination is in time point T during operating in an intermittent modebDie-off), controller 332 can turn by detection direct current The shut-in time of direct current transducer 310 produces testing result DR, and according to testing result DR adjustment reference power sources VCMDVoltage Level VCA.When testing result DR indicates that the shut-in time of DC-DC converter 310 is more than a special time, control electricity Road 330 can be by reduction reference power source VCMDVoltage quasi position VCATo adjust control signal SC, wherein control circuit 330 can reduce Voltage quasi position VCAUntil control signal SCMake untill the unlatching of DC-DC converter 310 (for example, time point Tc).Can by Fig. 5 Know, not by reference power source VCMDVoltage quasi position VCACome down to voltage quasi position VCBBefore, process circuit 336 was planned in time point TdSwitch left arm control signal SCLAnd right arm control signal SCRSignal level；As reference power source VCMDVoltage quasi position VCAAdjustment For voltage quasi position VCBWhen, process circuit 336 can shift to an earlier date in time point TcSwitch left arm control signal SCLAnd right arm control signal SCRSignal level, to avoid DC-DC converter 310 from being continuously in the overlong time of closed mode.
Adjustment control signal S aboveCSpecific implementation be only for the need of explanation, be not used as the limit of the present invention System.In addition, in the case of the power supply changeover device taken other form is to realize the DC-DC converter 310 shown in Fig. 3, Type/the number for the control signal that DC-DC converter 310 is received might have corresponding adjustment, and control signal Adjustment mode may would also vary from.
Furthermore as long as the control circuit 330 shown in Fig. 3 can be by detection control signal SCTo adjust reference power source VCMD, enter And adjust control signal SCResponsibility cycle, realize control circuit 330 and feasible using other circuit frameworks.Citing comes Say, control circuit 330 can also store input power VPV, reference power source VCMDWith control signal SCResponsibility cycle relation table, control Circuit 330 processed can select reference power source V according to testing result DRCMDVoltage quasi position.
It is worth noting that, the controlling mechanism of the inverter 300 described above on shown in Fig. 3 can also be applied to Fig. 1 Shown inverter 100.Summary, inverter of the invention can be by the control signals of detecting primary side change-over circuit To learn its working condition, and signal level/responsibility cycle of control signal is adaptively adjusted, therefore can be tieed up in intermittent mode Keep steady fixed running, and is widely used among various energy conversion frameworks.
The above disclosed right for being only the preferred embodiments of the present invention, the present invention can not being limited with this certainly Scope, therefore the equivalent variations made according to scope of the present invention patent, still belong to the scope that the present invention is covered.

Claims (12)

1. a kind of inverter, it is characterised in that include：
Circulate direct current transducer always, one input power is converted into a dc source according to a control signal；
One switcher for changing DC into AC, the DC-DC converter is coupled to, to receive the dc source, and foundation The dc source produces an AC power；And
One control circuit, the DC-DC converter is coupled to, the control circuit is to according to a reference power source and institute Input power is stated to produce the control signal to control the operation of the DC-DC converter, the control signal is entered Row detection is believed to produce a testing result, and according to the testing result to control the reference power source with adjusting the control Number a responsibility cycle,
Wherein described control circuit makees ratio to a voltage quasi position of the input power and a voltage quasi position of the reference power source The control signal is produced compared with to produce a comparative result, and according to the comparative result.
2. inverter according to claim 1, it is characterised in that the control signal have one first level from it is different In one second level of first level；And when the DC-DC converter operates according to the control signal During one intermittent mode, the control signal can be continuously in second level, and the control circuit detects the control Signal is continuously in time of second level to produce the testing result.
3. inverter according to claim 2, it is characterised in that when the testing result indicates the control signal When being continuously in second level more than a special time, the voltage that the control circuit can adjust the reference power source is accurate Position.
4. inverter according to claim 1, it is characterised in that when the comparative result indicates the input power Voltage quasi position when being less than the voltage quasi position of the reference power source, the DC-DC converter can be according to described in Control signal operates in an intermittent mode.
5. inverter according to claim 1, it is characterised in that the control circuit is adjusted according to the testing result The voltage quasi position of the whole reference power source, to adjust the responsibility cycle of the control signal.
6. inverter according to claim 5, it is characterised in that the control signal have one first level from it is different In one second level of first level；When the DC-DC converter is operated between one according to the control signal During pattern of having a rest, the control signal can be continuously in second level, and when the testing result indicates the control When signal is continuously in second level more than a special time, the control circuit can reduce the described of the reference power source Voltage quasi position.
7. inverter according to claim 6, it is characterised in that the control circuit can reduce the reference power source The voltage quasi position is untill the control signal is converted to first level from second level.
A kind of 8. control method of inverter, it is characterised in that the inverter include always circulate direct current transducer with One input power is converted to a dc source, the direct current by one switcher for changing DC into AC, the DC-DC converter Deliver stream transformer and the dc source is converted into an AC power, the control method includes：
A control signal is produced according to a reference power source and the input power, to control the DC-DC converter Operation；
The control signal is detected to produce a testing result；And
The reference power source is controlled according to the testing result to adjust a responsibility cycle of the control signal,
The step of wherein according to a reference power source and the input power to produce a control signal, includes：
Tied compared with being made comparisons to a voltage quasi position of the input power with a voltage quasi position of the reference power source to produce one Fruit；And
The control signal is produced according to the comparative result.
9. control method according to claim 8, it is characterised in that when the comparative result indicates the input power Voltage quasi position when being less than the voltage quasi position of the reference power source, the DC-DC converter can be according to described in Control signal operates in an intermittent mode.
10. control method according to claim 8, it is characterised in that the reference is controlled according to the testing result Power supply is included with adjusting the step of the responsibility cycle of the control signal：
The voltage quasi position of the reference power source is adjusted according to the testing result, to adjust described in the control signal Responsibility cycle.
11. control method according to claim 10, it is characterised in that the control signal is with one first level and not It is same as one second level of first level；When the DC-DC converter operates in one according to the control signal During intermittent mode, the control signal can be continuously in second level；And when the testing result indicates the control When signal processed is continuously in second level more than a special time, the reference power source is adjusted according to the testing result The voltage quasi position the step of include：
Reduce the voltage quasi position of the reference power source.
12. control method according to claim 11, it is characterised in that reduce the voltage quasi position of the reference power source The step of include：
The voltage quasi position of the reference power source is reduced until the control signal is converted to described from second level Untill one level.
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