CN114583809B - Portable energy storage bidirectional inversion charging system - Google Patents
Portable energy storage bidirectional inversion charging system Download PDFInfo
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- CN114583809B CN114583809B CN202210460008.0A CN202210460008A CN114583809B CN 114583809 B CN114583809 B CN 114583809B CN 202210460008 A CN202210460008 A CN 202210460008A CN 114583809 B CN114583809 B CN 114583809B
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- 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
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
The invention relates to a portable energy storage bidirectional inversion charging system, which relates to the technical field of circuit control and comprises an energy storage unit, an inversion unit, a detection unit and a control unit. The invention boosts the input alternating current by arranging the inversion unit, converts the input alternating current into direct current after inversion to charge the energy storage unit, greatly reduces the loss of electric quantity in the conversion process by three times of direct current-alternating current conversion, detects the voltage frequency in the circuit by arranging the detection unit, adjusts the voltage frequency in the circuit by adjusting the capacitance value of the C2 capacitor and the initial switching time length arranged in the control unit, charges and protects the energy storage unit by stable voltage when charging the energy storage unit, prolongs the service life of the energy storage unit, improves the range of the alternating current load by adjusting the voltage frequency when carrying out the alternating current load, and can be suitable for alternating current load equipment with various requirements.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to a portable energy storage bidirectional inversion charging system.
Background
The inverter circuit is a conversion circuit for converting direct current electric energy into alternating current electric energy, can be used for forming various alternating current power supplies and is widely applied in industry, the most common alternating current power supply in production is a public power grid supplied by a power plant, and the supply of power to an alternating current load by the public power grid is the most common power supply mode.
In the existing energy storage device using the inverter circuit, the requirement on parameters in a circuit during current conversion is often low, so that the service life of the energy storage device is greatly shortened, and in the process of inversion, the frequency of voltage in the circuit cannot be strictly controlled, so that the limitation of a direct current-to-alternating current load is large, and all load equipment needing to provide alternating current cannot be comprehensively coped with.
Disclosure of Invention
Therefore, the invention provides a portable energy storage bidirectional inversion charging system which is used for solving the problems that an energy storage device in the prior art is short in service life and large in limitation of direct current-to-alternating current load.
In order to achieve the above object, the present invention provides a portable energy storage bidirectional inversion charging system, comprising,
the energy storage unit inputs electric quantity through direct current and stores the input electric quantity, and the energy storage unit can output the internally stored electric quantity through the direct current;
the inversion unit is connected with the energy storage unit, can convert the direct current output by the energy storage unit into alternating current for outputting the alternating current, and can convert the alternating current into the direct current for inputting the direct current into the energy storage unit for storing; the input end of the inverter unit is provided with a front stage conversion circuit, the output end of the inverter unit is provided with a rear stage conversion circuit, the front stage conversion circuit is provided with a Q2 field effect tube, a Q3 field effect tube, a Q7 field effect tube and a Q8 field effect tube, a Q3 field effect tube is connected with a Q7 field effect tube in series, a Q2 field effect tube is connected with a Q8 field effect tube in series, a Q3 field effect tube and a Q7 field effect tube which are connected with each other in parallel are connected with a Q2 field effect tube and a Q8 field effect tube in series to form a full bridge circuit, the rear stage conversion circuit is provided with a Q1 field effect tube, a Q4 field effect tube, a Q5 field effect tube, a Q6 field effect tube, a full bridge circuit formed by the Q6 field effect tube in parallel are connected, wherein, each field effect tube is provided with a diode with adjustable direction; the front-stage conversion circuit and the rear-stage conversion circuit are connected with a resonant circuit through a T1 transformer, the resonant circuit comprises an L1 inductor and a C2 capacitor, the capacitance value of the C2 capacitor is adjustable, and an L2 inductor, a Q5 field-effect tube and a Q12 field-effect tube are arranged in the rear-stage conversion circuit to form a booster circuit;
the detection unit is connected with the inversion unit, can detect the real-time frequency of the alternating current in the resonant circuit, and can also detect the voltage at two ends of the capacitor C2 and the real-time current in the resonant circuit;
the control unit is connected with the energy storage unit, the inversion unit and the detection unit respectively, the control unit converts direct current output by the energy storage unit into alternating current or converts alternating current into direct current to be input to the energy storage unit by controlling field effect transistors in the inversion unit, inversion standard frequency is arranged in the control unit, the detection unit detects real-time frequency of the alternating current in the resonant circuit, and the control unit judges whether to adjust the capacitance value of the C2 capacitor or not according to the inversion standard frequency and the real-time frequency so as to adjust the real-time frequency of the alternating current in the resonant circuit.
Further, an inversion standard frequency Hb is arranged in the control unit, when the energy storage unit outputs the alternating current for load, the control unit sets an initial switching time tc according to the inversion standard frequency Hb, wherein tc = 1/(2 Hb), the control unit firstly controls the Q3 field effect transistor to be connected with the Q8 field effect transistor and controls the Q2 field effect transistor to be disconnected with the Q7 field effect transistor, after the initial switching time tc passes, the control unit then controls the Q3 field effect transistor to be disconnected with the Q8 field effect transistor and controls the Q2 field effect transistor to be connected with the Q7 field effect transistor, and the control unit repeats the operation of switching the field effect transistors through the initial switching time tc, converts the direct current output by the energy storage unit into the alternating current through the preceding stage conversion circuit, and outputs the alternating current to the T1 transformer for boosting.
Further, when the alternating current output from the preceding stage conversion circuit is boosted to the T1 transformer, the control unit controls diodes in the Q1 fet, the Q4 fet, the Q9 fet, and the Q10 fet to form a bridge rectifier circuit to convert the boosted alternating current into direct current, the direct current is smoothed by the capacitor C1, the control unit controls the Q6 fet to be turned on with the Q12 fet and controls the Q5 fet to be turned off with the Q11 fet, after an initial switching time tc, the control unit controls the Q6 fet to be turned off with the Q12 fet and controls the Q5 fet to be turned on with the Q11 fet, and the control unit repeats the above operation of switching the fets by the initial switching time tc to convert the direct current in the subsequent stage conversion circuit into alternating current and output a load.
Further, an inversion standard frequency difference Δ Hb is arranged in the control unit, when the inversion unit converts the direct current output by the energy storage unit into an alternating current, the detection unit detects a real-time frequency Hs of the alternating current in the resonant circuit, the control unit calculates the real-time frequency difference Δ Hs according to the real-time frequency Hs and the inversion standard frequency Hb, Δ Hs = | Hb-Hs |, the control unit compares the real-time frequency difference Δ Hs with the inversion standard frequency difference Δ Hb,
when the delta Hs is less than or equal to the delta Hb, the control unit judges that the real-time frequency difference does not exceed the inversion standard frequency difference, the inversion unit is in a standard inversion state, and the inversion unit is not adjusted;
when the delta Hs is larger than the delta Hb, the control unit judges that the real-time frequency difference exceeds the inversion standard frequency difference, the inversion unit is not in a standard inversion state, the control unit compares the real-time frequency with the inversion standard frequency, and judges the adjusting mode of the inversion unit according to the comparison result.
Further, when the control unit determines that the real-time frequency difference exceeds the inversion standard frequency difference, the control unit compares the real-time frequency Hs with the inversion standard frequency Hb,
when Hs is less than Hb, the control unit judges that the real-time frequency is lower than the inversion standard frequency, and the control unit adjusts the initial switching time length;
and when Hs is larger than Hb, the control unit judges that the real-time frequency is higher than the inversion standard frequency, judges the real-time frequency and selects the adjusting mode of the inversion unit according to the judgment result.
Further, when the control unit determines that the real-time frequency is lower than the inversion standard frequency, the control unit adjusts the initial switching time length to tc ', tc' =1/2(2Hb-Hs), the detection unit detects the real-time frequency Hs 'of the alternating current in the resonant circuit after the initial switching time length is adjusted, and the control module repeats the operation of calculating the real-time frequency difference Δ Hs according to the real-time frequency Hs and the inversion standard frequency Hb, calculates the real-time frequency difference Δ Hs', compares the real-time frequency difference with the inversion standard frequency difference, and determines until Δ Hs 'is less than or equal to Δ Hb, or stops adjusting the initial switching time length when Hs' is greater than Hb.
Furthermore, the control unit is provided with a maximum adjusting frequency Hz, when the control unit judges that the real-time frequency is higher than the inversion standard frequency, the control unit compares the real-time frequency Hs with the maximum adjusting frequency Hz,
when Hs is less than or equal to Hz, the control unit judges that the real-time frequency does not exceed the maximum adjusting frequency, and the control unit adjusts the capacitance value of the C2 capacitor to control the real-time frequency in the resonant circuit;
when Hs is larger than Hz, the control unit judges that the real-time frequency exceeds the maximum adjusting frequency, and the control unit adjusts the initial switching duration to control the real-time frequency in the resonant circuit.
Further, the control unit is provided with an initial capacitance value Fc of the C2 capacitor, when the control unit determines that the real-time frequency does not exceed the maximum adjusting frequency, the detection unit detects a real-time voltage value Vs across the C2 capacitor, the detection unit detects a real-time current value As in the resonant circuit, and the control module adjusts the initial capacitance value Fc ' of the C2 capacitor to Fc ', Fc ' = As/(2 × Hb × Vs).
Further, when the control unit determines that the real-time frequency exceeds the maximum adjustment frequency, the control unit adjusts the initial switching time duration to tc ', tc ' = tc [1+ (Hs-Hb)/Hs ], the detection unit detects the real-time frequency Hs ' of the alternating current in the resonant circuit after the initial switching time duration is adjusted, and the control module repeats the operation of calculating the real-time frequency difference Δ Hs according to the real-time frequency Hs and the inversion standard frequency Hb, calculates the real-time frequency difference Δ Hs ', and compares the real-time frequency difference with the inversion standard frequency difference until the operation of determining the real-time frequency difference Δ Hs ' is less than or equal to Δ Hb, or stops adjusting the initial switching time duration when the real-time frequency is greater than Hb.
Further, when the energy storage unit is charged with alternating current, the alternating current rises to 450V from a booster circuit consisting of an L2 inductor, a Q5 field effect tube and a Q12 field effect tube in the rear-stage conversion circuit, and then is converted into direct current through a rectifying circuit formed by diodes in a Q5 field effect tube, a Q6 field effect tube, a Q11 field effect tube and a Q12 field effect tube, after being smoothed by a capacitor C1, the voltage enters a full-bridge circuit consisting of a Q1 field effect transistor, a Q4 field effect transistor, a Q9 field effect transistor and a Q10 field effect transistor, the direct current is converted into alternating current again under the control of the control unit, the converted alternating current is subjected to voltage reduction through a T1 transformer, the reduced alternating current is converted into the direct current again through a rectifying circuit formed by diodes in a Q2 field effect transistor, a Q3 field effect transistor, a Q7 field effect transistor and a Q8 field effect transistor, and the direct current is input into the energy storage unit for alternating current charging.
Compared with the prior art, the invention has the advantages that the energy storage unit is arranged to store and output the electric quantity, the inversion unit is arranged to convert the direct current output by the energy storage unit into alternating current and then carry out alternating current load, the inversion unit can also boost the input alternating current and then convert the alternating current into direct current to charge the energy storage unit, the loss of the electric quantity in the conversion process is greatly reduced through three times of direct current-alternating current conversion, meanwhile, the voltage frequency in the circuit is detected through the setting of the detection unit, the voltage frequency in the circuit is adjusted through adjusting the capacitance value of the C2 capacitor and the initial switching time length set in the control unit, when the energy storage unit is charged, the energy storage unit is charged and protected through stable voltage, and the service life of the energy storage unit is prolonged, when the alternating current load is carried out, the voltage frequency is adjusted, so that the range of the alternating current load is widened, and the alternating current load device can be suitable for alternating current load equipment with various requirements.
Furthermore, the initial switching time length is set through the inversion standard frequency set in the control unit, the voltage frequency at which inversion starts in the circuit is guaranteed, the change of current reversal at the transformer is realized through the control of each field effect tube in the preceding stage conversion circuit, so that direct current is converted into alternating current, the transformer is used for boosting the converted alternating current, and the loss of electric quantity in the circuit can be reduced.
Particularly, a bridge rectifier circuit is formed by diodes arranged in each field effect transistor, current is directionally conducted, boosted alternating current is converted back to direct current, the direct current is smoothed by an energy storage C1 capacitor, the direct current in the partial circuit is more stable, the field effect transistors are controlled by a control unit in a full bridge circuit formed by the field effect transistors, the smoothed direct current is converted into more stable alternating current, and the converted alternating current is greatly stabilized while the electric quantity in the circuit is low for alternating current load output.
Particularly, the inversion standard frequency difference is set, the real-time frequency of alternating current in the resonant circuit is detected through the detection unit, the control unit calculates the real-time frequency difference according to the real-time frequency and the inversion standard frequency, the real-time frequency difference is compared with the inversion standard frequency difference, whether the inversion unit is in a standard inversion state or not is determined, the voltage frequency in the circuit is detected to guarantee the stability of voltage in the circuit, meanwhile, the real-time frequency in the circuit is controlled within a certain range through the comparison of the real-time frequency difference and the inversion standard frequency difference, the judgment process of the control unit is reduced, and the judgment efficiency of the control unit is improved.
Further, when the control unit judges that the real-time frequency difference exceeds the inversion standard frequency difference, the control unit compares the real-time frequency with the inversion standard frequency, and when the real-time frequency is lower than the inversion standard frequency, the duration of the current in one direction in one period is higher than a set standard state, wherein the current may be delayed by an inductor or a capacitor for stably filtering the circuit, so that the initial switching duration is adjusted to enable the real-time frequency to reach the standard state, and the circuit is protected.
Furthermore, when the control unit judges that the real-time frequency is lower than the inversion standard frequency, the control unit adjusts and reduces the initial switching time length so as to stably delay the current and delay the filtering in the impact circuit, and the real-time frequency is adjusted to the standard inversion frequency while the stability and the filtering of the current in the circuit are not influenced, so that the energy storage unit is protected, and the service life of the energy storage unit is prolonged.
Further, the maximum adjusting frequency is set in the control unit, when the real-time frequency is higher than the inversion standard frequency, the real-time frequency is compared with the maximum adjusting frequency, when the real-time frequency does not exceed the maximum adjusting frequency, the real-time frequency needing to be reduced is within the adjustable range of the capacitance C2, the real-time frequency is controlled by adjusting the capacitance value of the capacitance, when the real-time frequency exceeds the maximum adjusting frequency, the adjustable range of the capacitance is indicated, the initial switching time length is adjusted through the control unit, and the stability of the real-time frequency in the circuit is guaranteed.
Particularly, when the real-time frequency does not exceed the maximum adjusting frequency, the real-time frequency is reduced by adjusting the capacitance value of the capacitor, because the real-time frequency is higher than the standard inversion frequency range, the duration of the circuit in the same direction is lower than the standard state, and because the voltage in the circuit is unstable and the external interference causes, the delay of the capacitor is increased by adjusting the capacitance value of the capacitor, so that the real-time frequency is controlled in the standard inversion frequency range, and the normal operation of the inverter circuit is ensured.
Further, when the control unit determines that the real-time frequency exceeds the maximum adjustment frequency, the capacitance adjustable range is exceeded, the duration of the circuit in the same direction is lower than the standard state, although the increase of the initial switching duration may cause the abnormality of the circuit voltage, in order to ensure that the real-time frequency is in the standard inversion state, the initial switching duration in the control unit is adjusted, so that the real-time frequency is stabilized to the maximum extent, and the stability of the circuit is improved.
Further, when carrying out AC charging to the energy storage unit through the alternating current, carry out the high step-up with the alternating current of input earlier, reduce the electric quantity loss in rectifier circuit, convert highly compressed alternating current into the direct current through rectifier circuit, the direct current of rethread C1 electric capacity is smooth to the conversion, make it more steady and convert the alternating current into through steady direct current and step down in the circuit, convert more steady direct current into and charge in to the energy storage unit, on the basis of realizing through AC charging, the life of energy storage unit has been improved.
Drawings
Fig. 1 is a schematic structural diagram of a portable energy storage bidirectional inversion charging system according to this embodiment;
fig. 2 is a circuit diagram of the inverter unit according to the present embodiment.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and fig. 2, wherein fig. 1 is a schematic structural diagram of a portable energy storage bidirectional inverter charging system according to the present embodiment, and fig. 2 is a schematic circuit diagram of an inverter unit according to the present embodiment, the present embodiment discloses a portable energy storage bidirectional inverter charging system, including,
the energy storage unit inputs electric quantity through direct current and stores the input electric quantity, and the energy storage unit can output the internally stored electric quantity through the direct current;
the inversion unit is connected with the energy storage unit, can convert the direct current output by the energy storage unit into alternating current for outputting the alternating current, and can convert the alternating current into the direct current for inputting the direct current into the energy storage unit for storing; the input end of the inverter unit is provided with a front stage conversion circuit, the output end of the inverter unit is provided with a rear stage conversion circuit, the front stage conversion circuit is provided with a Q2 field effect tube, a Q3 field effect tube, a Q7 field effect tube and a Q8 field effect tube, a Q3 field effect tube is connected with a Q7 field effect tube in series, a Q2 field effect tube is connected with a Q8 field effect tube in series, a Q3 field effect tube and a Q7 field effect tube which are connected in series are connected with a Q2 field effect tube and a Q8 field effect tube in parallel to form a full bridge circuit, the rear stage conversion circuit is provided with a Q1 field effect tube, a Q4 field effect tube, a Q5 field effect tube, a Q6 field effect tube are formed by the full bridge circuit and Q6 field effect tube in parallel, wherein, each field effect tube is provided with a diode with adjustable direction; the front-stage conversion circuit and the rear-stage conversion circuit are connected with a resonant circuit through a T1 transformer, the resonant circuit comprises an L1 inductor and a C2 capacitor, the capacitance value of the C2 capacitor is adjustable, and an L2 inductor, a Q5 field-effect tube and a Q12 field-effect tube are arranged in the rear-stage conversion circuit to form a booster circuit;
the detection unit is connected with the inverter unit, can detect the real-time frequency of the alternating current in the resonant circuit, and can also detect the voltage at two ends of the capacitor C2 and the real-time current in the resonant circuit;
the control unit is connected with the energy storage unit, the inversion unit and the detection unit respectively, the control unit converts direct current output by the energy storage unit into alternating current or converts alternating current into direct current to be input to the energy storage unit by controlling field effect tubes in the inversion unit, inversion standard frequency is arranged in the control unit, the detection unit detects real-time frequency of the alternating current in the resonant circuit, and the control unit judges whether to adjust capacitance of a C2 capacitor according to the inversion standard frequency and the real-time frequency so as to adjust the real-time frequency of the alternating current in the resonant circuit.
The energy storage unit is arranged to store and output the electric quantity, the inversion unit is arranged to convert the direct current output by the energy storage unit into alternating current and then convert the alternating current into alternating current for loading, the inversion unit can also boost the input alternating current and then convert the alternating current into direct current for charging the energy storage unit, the loss of the electric quantity in the conversion process is greatly reduced through three times of direct current-alternating current conversion, meanwhile, the detection unit is arranged to detect the voltage frequency in the circuit, the voltage frequency in the circuit is adjusted through adjusting the capacitance value of the C2 capacitor and the initial switching time length set in the control unit, when the energy storage unit is charged, the energy storage unit is charged and protected through stable voltage, the service life of the energy storage unit is prolonged, when the alternating current loading is carried out, through the adjustment of the voltage frequency, the range of the alternating current load is improved, and the alternating current load device can be suitable for alternating current load equipment with various requirements.
Specifically, an inversion standard frequency Hb is arranged in the control unit, when an alternating current output load is carried out through the energy storage unit, the control unit sets an initial switching time tc according to the inversion standard frequency Hb, wherein tc = 1/(2 Hb), the control unit firstly controls a Q3 field effect transistor to be connected with a Q8 field effect transistor and controls a Q2 field effect transistor to be disconnected with a Q7 field effect transistor, after the initial switching time tc passes, the control unit controls a Q3 field effect transistor to be disconnected with a Q8 field effect transistor and controls a Q2 field effect transistor to be connected with a Q7 field effect transistor, when the Q3 field effect transistor and the Q8 field effect transistor are opened and the Q2 field effect transistor and the Q7 field effect transistor are closed, a direct current voltage flows into a negative electrode through a primary side 1 of the transformer, and the primary side 1 of the transformer is a "+" primary side 2 "-"; when the Q2 field effect transistor and the Q7 field effect transistor are turned on, and the Q3 field effect transistor and the Q8 field effect transistor are turned off, the direct current voltage enters the negative electrode through the primary side 2 of the transformer, at this time, the primary side 1 of the transformer is a "-" primary side 2 "+", the control unit repeats the operation of switching the field effect transistors through the initial switching time period tc, the direct current output by the energy storage unit is converted into alternating current through the pre-stage conversion circuit, and the alternating current is output to the T1 transformer to be boosted.
The initial switching time length is set through the inversion standard frequency set in the control unit, the voltage frequency at which inversion starts in the circuit is guaranteed, and the reverse change of current at the transformer is realized through the control of each field effect tube in the preceding stage conversion circuit, so that direct current is converted into alternating current, the converted alternating current is subjected to boosting treatment through the transformer, and the loss of electric quantity in the circuit can be reduced.
Specifically, when the alternating current output from the preceding stage conversion circuit is boosted to the T1 transformer, the control unit controls diodes in the Q1 fet, the Q4 fet, the Q9 fet, and the Q10 fet to form a bridge rectifier circuit to convert the boosted alternating current into direct current, the direct current is smoothed by the capacitor C1, the control unit controls the Q6 fet to be turned on with the Q12 fet and controls the Q5 fet to be turned off with the Q11 fet, after an initial switching time period tc, the control unit controls the Q6 fet to be turned off with the Q12 fet and controls the Q5 fet to be turned on with the Q11 fet, and the control unit repeats the above operation of switching the fets through the initial switching time period tc to convert the direct current in the subsequent stage conversion circuit into alternating current and output a load.
Through the diode that sets up in each field effect transistor, constitute bridge rectifier circuit, carry out directional switching on to the electric current, the alternating current after will stepping up changes back the direct current, wherein carried out the smoothness to the direct current through energy storage C1 electric capacity, make the direct current in this part circuit more stable, full-bridge circuit through field effect transistor constitution, by the control unit control field effect transistor, direct current after will smoothing converts more stable alternating current into, to carrying out the alternating current load output, when electric quantity consumed in lower circuit, the alternating current that makes the conversion in very big degree is stable.
Specifically, an inversion standard frequency difference Δ Hb is set in the control unit, when the inversion unit converts the direct current output by the energy storage unit into an alternating current, the detection unit detects a real-time frequency Hs of the alternating current in the resonant circuit, the control unit calculates the real-time frequency difference Δ Hs according to the real-time frequency Hs and the inversion standard frequency Hb, Δ Hs = | Hb-Hs |, the control unit compares the real-time frequency difference Δ Hs with the inversion standard frequency difference Δ Hb,
when the delta Hs is less than or equal to the delta Hb, the control unit judges that the real-time frequency difference does not exceed the inversion standard frequency difference, the inversion unit is in a standard inversion state, and the inversion unit is not adjusted;
when the delta Hs is larger than the delta Hb, the control unit judges that the real-time frequency difference exceeds the inversion standard frequency difference, the inversion unit is not in a standard inversion state, the control unit compares the real-time frequency with the inversion standard frequency, and judges the adjusting mode of the inversion unit according to the comparison result.
Through setting up the contravariant standard frequency difference, and detect the real-time frequency of alternating current in the resonant circuit through the detecting element, the control unit calculates the real-time frequency difference according to real-time frequency and contravariant standard frequency, compare real-time frequency difference and contravariant standard frequency difference, confirm whether the contravariant unit is in standard contravariant state, the stability of voltage in the voltage frequency guarantee circuit among the detecting circuit, compare through real-time frequency difference and contravariant standard frequency difference simultaneously, real-time frequency control is in certain within range in the circuit, the decision-making process of the control unit has been reduced, the decision efficiency of the control unit is improved.
Specifically, when the control unit determines that the real-time frequency difference exceeds the inversion standard frequency difference, the control unit compares the real-time frequency Hs with the inversion standard frequency Hb,
when Hs is less than Hb, the control unit judges that the real-time frequency is lower than the inversion standard frequency, and the control unit adjusts the initial switching time length;
and when Hs is larger than Hb, the control unit judges that the real-time frequency is higher than the inversion standard frequency, judges the real-time frequency and selects the adjusting mode of the inversion unit according to the judgment result.
When the control unit judges that the real-time frequency difference exceeds the inversion standard frequency difference, the control unit compares the real-time frequency with the inversion standard frequency, and when the real-time frequency is lower than the inversion standard frequency, the duration of current in one direction in one period is higher than a set standard state, wherein the current may be delayed by an inductor or a capacitor for stably filtering the circuit, so that the initial switching duration is adjusted to enable the real-time frequency to reach the standard state, and the circuit is protected.
Specifically, when the control unit determines that the real-time frequency is lower than the inversion standard frequency, the control unit adjusts the initial switching time duration to tc ', tc' =1/2(2Hb-Hs), the detection unit detects the real-time frequency Hs 'of the alternating current in the resonant circuit after the initial switching time duration is adjusted, and the control module repeats the operation of calculating the real-time frequency difference Δ Hs according to the real-time frequency Hs and the inversion standard frequency Hb, calculates the real-time frequency difference Δ Hs', compares the real-time frequency difference with the inversion standard frequency difference, and determines until Δ Hs 'is less than or equal to Δ Hb, or stops adjusting the initial switching time duration when Hs' is greater than Hb.
When the control unit judges that the real-time frequency is lower than the inversion standard frequency, the control unit adjusts the initial switching duration to be reduced so as to delay the current by smoothing and filtering in the hedging circuit, and adjust the real-time frequency to the standard inversion frequency while not influencing the smoothing and filtering of the current in the circuit, so that the energy storage unit is protected, and the service life of the energy storage unit is prolonged.
Specifically, the control unit is provided with a maximum adjusting frequency Hz, when the control unit judges that the real-time frequency is higher than the inversion standard frequency, the control unit compares the real-time frequency Hs with the maximum adjusting frequency Hz,
when Hs is less than or equal to Hz, the control unit judges that the real-time frequency does not exceed the maximum adjusting frequency, and the control unit adjusts the capacitance value of the C2 capacitor to control the real-time frequency in the resonant circuit;
when Hs is larger than Hz, the control unit judges that the real-time frequency exceeds the maximum adjusting frequency, and the control unit adjusts the initial switching duration to control the real-time frequency in the resonant circuit.
The maximum adjusting frequency is set in the control unit, when the real-time frequency is higher than the inversion standard frequency, the real-time frequency is compared with the maximum adjusting frequency, when the real-time frequency does not exceed the maximum adjusting frequency, the real-time frequency needing to be reduced is within the adjustable range of the capacitance C2, the real-time frequency is controlled by adjusting the capacitance value of the capacitance, when the real-time frequency exceeds the maximum adjusting frequency, the adjustable range of the capacitance is indicated, the initial switching time length is adjusted through the control unit, and the stability of the real-time frequency in the circuit is guaranteed.
Specifically, the control unit is provided with an initial capacitance value Fc of a C2 capacitor, when the control unit determines that the real-time frequency does not exceed the maximum regulation frequency, the detection unit detects a real-time voltage value Vs across the C2 capacitor, the detection unit detects a real-time current value As in the resonant circuit, and the control module adjusts the initial capacitance value of the C2 capacitor to Fc ', Fc' = As/(2 × Hb × Vs).
When the real-time frequency does not exceed the maximum adjusting frequency, the real-time frequency is reduced by adjusting the capacitance value of the capacitor, because the real-time frequency is higher than the standard inversion frequency range, the duration of the circuit in the same direction is lower than the standard state, and because of the instability of the voltage in the circuit and the external interference, the delay of the capacitor is increased by adjusting the capacitance value of the capacitor, so that the real-time frequency is controlled in the standard inversion frequency range, and the normal operation of the inverter circuit is ensured.
Specifically, when the control unit determines that the real-time frequency exceeds the maximum adjustment frequency, the control unit adjusts the initial switching time length to tc ', tc' = tc [1+ (Hs-Hb)/Hs ], the detection unit detects the real-time frequency Hs 'of the alternating current in the resonant circuit after the initial switching time length is adjusted, and the control module repeats the operation of calculating the real-time frequency difference Δ Hs according to the real-time frequency Hs and the inversion standard frequency Hb, calculates the real-time frequency difference Δ Hs', and compares the real-time frequency difference with the inversion standard frequency difference until the operation of calculating the real-time frequency difference Δ Hs 'is less than or equal to Δ Hb, or stops adjusting the initial switching time length when the real-time frequency exceeds Hs'.
When the control unit judges that the real-time frequency exceeds the maximum adjusting frequency, the adjustable range of the capacitance is exceeded, the duration of the circuit in the same direction is lower than the standard state, although the circuit voltage is abnormal due to the fact that the initial switching duration is prolonged, in order to guarantee that the real-time frequency is in the standard inversion state, the initial switching duration in the control unit is adjusted, the real-time frequency is stabilized to the maximum degree, and the stability of the circuit is improved.
Specifically, when the energy storage unit is charged with alternating current, the alternating current is boosted to 450V from a booster circuit consisting of an L2 inductor, a Q5 field effect transistor and a Q12 field effect transistor in the rear-stage conversion circuit, and then is converted into direct current through a rectifying circuit formed by diodes in a Q5 field effect transistor, a Q6 field effect transistor, a Q11 field effect transistor and a Q12 field effect transistor, after being smoothed by a capacitor C1, the voltage enters a full-bridge circuit consisting of a Q1 field effect transistor, a Q4 field effect transistor, a Q9 field effect transistor and a Q10 field effect transistor, the direct current is converted into alternating current again under the control of the control unit, the converted alternating current is subjected to voltage reduction through a T1 transformer, the reduced alternating current is converted into the direct current again through a rectifying circuit formed by diodes in a Q2 field effect transistor, a Q3 field effect transistor, a Q7 field effect transistor and a Q8 field effect transistor, and the direct current is input into the energy storage unit for alternating current charging.
When carrying out alternating current charging to the energy storage unit through the alternating current, carry out the high step-up with the alternating current of input earlier, reduce the electric quantity loss in rectifier circuit, convert highly compressed alternating current into the direct current through rectifier circuit, the direct current of rethread C1 electric capacity to the conversion is carried out smoothly, make it more steady and convert the alternating current into through steady direct current and step down in the circuit, convert more steady direct current into and charge in to the energy storage unit again, on the basis of realizing charging through the alternating current, the life of energy storage unit has been improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A portable energy storage bidirectional inversion charging system is characterized by comprising
The energy storage unit inputs electric quantity through direct current and stores the input electric quantity, and the energy storage unit can output the internally stored electric quantity through the direct current;
the inversion unit is connected with the energy storage unit, can convert the direct current output by the energy storage unit into alternating current for outputting the alternating current, and can convert the alternating current into the direct current for inputting the direct current into the energy storage unit for storing; the input end of the inverter unit is provided with a front stage conversion circuit, the output end of the inverter unit is provided with a rear stage conversion circuit, the front stage conversion circuit is provided with a Q2 field effect tube, a Q3 field effect tube, a Q7 field effect tube and a Q8 field effect tube, a Q3 field effect tube is connected with a Q7 field effect tube in series, a Q2 field effect tube is connected with a Q8 field effect tube in series, a Q3 field effect tube and a Q7 field effect tube which are connected with each other in parallel are connected with a Q2 field effect tube and a Q8 field effect tube in series to form a full bridge circuit, the rear stage conversion circuit is provided with a Q1 field effect tube, a Q4 field effect tube, a Q5 field effect tube, a Q6 field effect tube, a full bridge circuit formed by the Q6 field effect tube in parallel are connected, wherein, each field effect tube is provided with a diode with adjustable direction; the front-stage conversion circuit and the rear-stage conversion circuit are connected with a resonant circuit through a T1 transformer, the resonant circuit comprises an L1 inductor and a C2 capacitor, the capacitance value of the C2 capacitor is adjustable, and an L2 inductor, a Q5 field-effect tube and a Q12 field-effect tube are arranged in the rear-stage conversion circuit to form a booster circuit;
the detection unit is connected with the inverter unit, can detect the real-time frequency Hs of the alternating current in the resonant circuit, and can also detect the voltage at two ends of a C2 capacitor and the real-time current in the resonant circuit;
the control unit is connected with the energy storage unit, the inversion unit and the detection unit respectively, converts direct current output by the energy storage unit into alternating current or converts alternating current into direct current to be input to the energy storage unit by controlling field effect tubes in the inversion unit, an inversion standard frequency Hb is arranged in the control unit, the detection unit detects a real-time frequency Hs of the alternating current in the resonant circuit, and the control unit judges whether to adjust a capacitance value of a C2 capacitor according to the inversion standard frequency Hb and the real-time frequency Hs so as to adjust the real-time frequency Hs of the alternating current in the resonant circuit;
the control unit is internally provided with an inversion standard frequency Hb, when the energy storage unit outputs load with alternating current, the control unit sets an initial switching time length tc according to the inversion standard frequency Hb, wherein tc = 1/(2 Hb), the control unit firstly controls a Q3 field effect transistor to be connected with a Q8 field effect transistor and controls a Q2 field effect transistor to be disconnected with a Q7 field effect transistor, after the initial switching time length tc passes, the control unit controls a Q3 field effect transistor to be disconnected with a Q8 field effect transistor and controls a Q2 field effect transistor to be connected with a Q7 field effect transistor, the control unit repeats the operation of switching the field effect transistors with the initial switching time length tc, converts direct current output by the energy storage unit into alternating current through the pre-stage conversion circuit and outputs the alternating current to the T1 transformer for boosting;
when the alternating current output by the preceding stage conversion circuit is boosted to the T1 transformer, the control unit controls diodes in the Q1 field effect transistor, the Q4 field effect transistor, the Q9 field effect transistor and the Q10 field effect transistor to form a bridge rectifier circuit to convert the boosted alternating current into direct current, the direct current is smoothed by a capacitor C1, the control unit firstly controls the Q6 field effect transistor to be connected with the Q12 field effect transistor and controls the Q5 field effect transistor to be disconnected with the Q11 field effect transistor, after an initial switching time period tc, the control unit controls the Q6 field effect transistor to be disconnected with the Q12 field effect transistor and controls the Q5 field effect transistor to be connected with the Q11 field effect transistor, and the control unit repeats the operation of switching the field effect transistors through the initial switching time period tc, converts the direct current in the subsequent stage conversion circuit into alternating current and outputs a load;
the control unit is provided with an inversion standard frequency difference delta Hb, when the inversion unit converts direct current output by the energy storage unit into alternating current, the detection unit detects real-time frequency Hs of the alternating current in the resonant circuit, the control unit calculates the real-time frequency difference delta Hs according to the real-time frequency Hs and the inversion standard frequency Hb, the delta Hs = | Hb-Hs |, the control unit compares the real-time frequency difference delta Hs with the inversion standard frequency difference delta Hb,
when the delta Hs is less than or equal to the delta Hb, the control unit judges that the real-time frequency difference delta Hs does not exceed the inversion standard frequency difference delta Hb, the inversion unit is in a standard inversion state, and the inversion unit is not adjusted;
when the delta Hs is larger than the delta Hb, the control unit judges that the difference of the real-time frequency difference delta Hs exceeds the inversion standard frequency difference delta Hb, the inversion unit is not in a standard inversion state, the control unit compares the real-time frequency Hs with the inversion standard frequency Hb, and judges the adjusting mode of the inversion unit according to the comparison result;
when the control unit judges that the real-time frequency difference delta Hs exceeds the inversion standard frequency difference delta Hb, the control unit compares the real-time frequency Hs with the inversion standard frequency Hb,
when Hs is less than Hb, the control unit judges that the real-time frequency Hs is lower than the inversion standard frequency Hb, and the control unit adjusts the initial switching time length;
when Hs is larger than Hb, the control unit judges that the real-time frequency Hs is higher than the inversion standard frequency Hb, judges the real-time frequency Hs and selects an adjusting mode of the inversion unit according to a judgment result;
when the control unit judges that the real-time frequency Hs is lower than the inversion standard frequency Hb, the control unit adjusts the initial switching time length to tc ', tc' =1/2(2Hb-Hs), the detection unit detects the real-time frequency Hs 'of the alternating current in the resonant circuit after the initial switching time length is adjusted, and the control module repeats the operation of calculating the real-time frequency difference delta Hs according to the real-time frequency Hs and the inversion standard frequency Hb, calculates the real-time frequency difference delta Hs', compares the real-time frequency difference with the inversion standard frequency difference delta Hb, and stops adjusting the initial switching time length until the delta Hs 'is less than or equal to the delta Hb or when the Hs' is greater than the Hb.
2. The portable energy storage bidirectional inversion charging system of claim 1, wherein a maximum adjusting frequency Hz is set in the control unit, when the control unit determines that the real-time frequency Hs is higher than the inversion standard frequency Hb, the control unit compares the real-time frequency Hs with the maximum adjusting frequency Hz,
when Hs is less than or equal to Hz, the control unit judges that the real-time frequency Hs does not exceed the maximum adjusting frequency Hz, and the control unit adjusts the capacitance value of the C2 capacitor to control the real-time frequency in the resonant circuit;
when Hs is larger than Hz, the control unit judges that the real-time frequency Hs exceeds the maximum adjusting frequency Hz, and the control unit adjusts the initial switching duration to control the real-time frequency Hs in the resonant circuit.
3. The portable energy storage bidirectional inversion charging system of claim 2, wherein the control unit is provided with an initial capacitance Fc of a C2 capacitor, when the control unit determines that the real-time frequency Hs does not exceed the maximum regulation frequency Hz, the detection unit detects a real-time voltage value Vs across the C2 capacitor, the detection unit detects a real-time current value As in the resonant circuit, and the control module adjusts the initial capacitance Fc of the C2 capacitor to Fc ', Fc' = As/(2 × Hb × Vs).
4. The portable energy storage bidirectional inversion charging system of claim 2, wherein when the control unit determines that the real-time frequency Hs exceeds the maximum adjusting frequency Hz, the control unit adjusts the initial switching duration to tc ', tc' = tc [1+ (Hs-Hb)/Hs ], the detection unit detects the real-time frequency Hs 'of the alternating current in the resonant circuit after the initial switching duration is adjusted, and the control module repeats the operation of calculating the real-time frequency difference Δ Hs according to the real-time frequency Hs and the inversion standard frequency Hb, calculates the real-time frequency difference Δ Hs', and compares the real-time frequency difference Δ Hs with the inversion standard frequency difference Δ Hb until Δ Hs 'is less than or equal to Δ Hb, or stops adjusting the initial switching duration when Hs' is greater than Hb.
5. The portable energy storage bidirectional inverter charging system according to claim 1, wherein when the energy storage unit is charged with ac power, the ac power is boosted to 450V from the boost circuit composed of the L2 inductor, the Q5 fet and the Q12 fet in the subsequent stage conversion circuit, and then converted into dc power through the rectifying circuit formed by the diodes in the Q5 fet, the Q6 fet, the Q11 fet and the Q12 fet, and smoothed by the capacitor C1 and then fed into the full bridge circuit composed of the Q1 fet, the Q4 fet, the Q9 fet and the Q10 fet, and the dc power is reconverted into ac power by the control of the control unit, and the converted ac power is stepped down by the T1 transformer, and the stepped-down ac power is reconverted into dc power through the rectifying circuit formed by the diodes in the Q2 fet, the Q3 fet, the Q7 fet and the Q8 fet, and inputting the voltage into the energy storage unit for alternating current charging.
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