CN113258816B - Sine wave high-frequency chain battery inversion method for realizing first and second quadrant operation - Google Patents
Sine wave high-frequency chain battery inversion method for realizing first and second quadrant operation Download PDFInfo
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- CN113258816B CN113258816B CN202110683803.1A CN202110683803A CN113258816B CN 113258816 B CN113258816 B CN 113258816B CN 202110683803 A CN202110683803 A CN 202110683803A CN 113258816 B CN113258816 B CN 113258816B
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/225—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode comprising two stages of AC-AC conversion, e.g. having a high frequency intermediate link
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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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- 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
- H02J2207/40—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries adapted for charging from various sources, e.g. AC, DC or multivoltage
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- Power Engineering (AREA)
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Abstract
The invention provides a sine wave high-frequency chain battery inversion method for realizing first and second quadrant operation, which is applied to an inversion device, wherein the inversion device comprises a battery; the H bridge inverter comprises a plurality of MOS (metal oxide semiconductor) tubes and is connected in parallel to form a topological structure of H bridge inversion, is electrically connected with the battery and is used for realizing an inversion function when the device is inverted and a rectification function when the device is charged; the high-frequency transformer comprises a primary winding and a secondary winding, the turn ratio is N1: N2, the high-frequency transformer is used for realizing bidirectional magnetization work, and the primary winding is connected with the H-bridge inverter; the alternating current switching device comprises 8 IGBTs or MOS tubes which are connected to form a complete self-turn-off H-bridge topological structure and is used for realizing the bidirectional flow of current, and the alternating current switching device is electrically connected with the secondary winding; and the filter circuit is electrically connected with the alternating current switch device. The invention can realize the bidirectional flow of current, and the current of the device can run in a quadrant or a quadrant, the voltage waveform can not be distorted, the circuit is simple and reliable, and the portability is improved.
Description
Technical Field
The invention belongs to the technical field of industrial inverter power supplies, and particularly relates to a sine wave high-frequency chain battery inversion method for realizing first and second quadrant operation.
Background
With the environmental protection requirement and the definition of the carbon neutralization schedule target, the application of the battery as a lithium battery inverter of an energy source is more and more popular. Compared with a gasoline or diesel generator, the lithium battery inverted alternating current power supply has the advantages of convenience in movement, quick response to load change, stable output voltage, no noise, no harm to people, environmental protection, no pollution, light weight and the like, and can gradually replace the generator, so that the lithium battery inverted alternating current power supply becomes a better choice.
In the prior art, a battery inverter generally adopts a power frequency transformer as an intermediate link of energy conversion, and the scheme is easy to realize control, but has low efficiency and heavy weight; or an inverter using a high frequency link scheme, but a separate charger or a built-in charging device is required, and the charging power source is only an ac 220V or other types of power sources, which increases the cost and complexity of the product. For example, the invention patent with application publication number CN112019062A discloses a sine wave three-level lithium battery inverter capable of realizing energy feedback, which adopts a high-frequency transformer to realize intermediate energy conversion, and adopts a high-frequency chain three-level circuit to control the output duty ratio through the level state and the real-time phase, so as to realize energy flow and smooth idle current channel, reduce harmonic waves and reduce idle current. For the mobile power supply, users put higher demands on portability, lightness, low cost, high reliability and the like.
Disclosure of Invention
The invention aims to provide a sine wave high-frequency chain battery inversion method for realizing first and second quadrant operation, which realizes bidirectional flow of current, enables the current of a device to operate in the first and second quadrants, prevents voltage waveform distortion, is simple and reliable in circuit and improves portability.
The invention provides the following technical scheme:
the application provides a sine wave high-frequency chain battery inversion method for realizing first and second quadrant operation, which is applied to an inversion device, wherein the inversion device comprises a battery;
the H-bridge inverter comprises a plurality of MOS (metal oxide semiconductor) tubes and is connected in parallel to form a topological structure of H-bridge inversion, is electrically connected with the battery and is used for realizing an inversion function when the device is inverted and a rectification function when the device is charged;
the high-frequency transformer comprises a primary winding and a secondary winding, the turn ratio is N1: N2, the high-frequency transformer is used for realizing bidirectional magnetization work, and the primary winding is connected with an H-bridge inverter;
the alternating current switching device comprises 8 IGBTs or MOS tubes which are connected to form a complete self-turn-off H-bridge topological structure and is used for realizing the bidirectional flow of current, and the alternating current switching device is electrically connected with the secondary winding;
the filter circuit is electrically connected with the alternating current switching device, is used for converting the intermittent square waves into continuous sine waves in an inversion state and enabling the idle current to be fed back to the battery smoothly, and is used for limiting current and storing energy in a charging state;
the sine wave high-frequency chain battery inversion method for realizing the first two-quadrant operation comprises the following steps of:
s1, when an inverter is in an inversion state, a battery is used as an electric energy source, is inverted by an H-bridge inverter and is converted into square wave alternating current carrying sine wave information, the square wave alternating current is boosted by a high-frequency transformer, the content carrying the sine wave information is demodulated and extracted according to phases by an alternating current switching device, is filtered by a filter circuit and is converted into the sine wave alternating current according to impulse theorem;
the device should meet the requirement in the inversion process
Where Φ is the sine wave phase, Vbattery is the battery voltage, N1 is the number of primary winding turns, N2 is the number of secondary winding turns,
duty ratio of PWM;
the alternating current switching device satisfies: the on-time is:
the turn-off time is:
wherein T is a carrier period and td is a dead time;
and S2, when the inverter is in a charging state, judging the current direction by short circuit of a group of 2 upper and lower bridge arm alternating current switch units in the alternating current switch device, controlling the 2 upper and lower bridge arm alternating current switch units to be alternately conducted to form alternating current square wave voltage to supply power to a load charging side of a high-frequency transformer, transmitting energy to an H bridge inverter on a battery side by the high-frequency transformer, and charging the battery after rectification.
Preferably, the H-bridge inverter comprises 4 tube banks A, B, C, D and constitutes an H-bridge topology, tube bank A, D being in phase, tube bank B, C being in phase, tube bank A, D and tube bank B, C being complementary 180 ° out of phase, each tube bank comprising n MOS tubes and body diodes connected in parallel.
Preferably, the turns ratio of the primary winding to the secondary winding
Wherein Vbattery is the battery voltage.
Preferably, 8 IGBTs or MOS transistors are divided into 4 ac switch units E, F, G, H and connected in a complete self-turn-off H-bridge topology, the ac switch units E, H are in phase and F, G are in phase, and the emitters or sources and the bases or gates of 2 IGBTs or MOS transistors in each ac switch unit are connected.
Preferably, the filter circuit comprises a first inductor, a second inductor and a third capacitor, the filter circuit is connected with the current sensor I, one end of the third capacitor C30 is connected with one end of the first inductor L1, which is far away from the current sensor I, and the third output terminal J3, and the other end of the third capacitor C30 is connected with one end of the second inductor L2, which is far away from the ac switching device, and the fourth output terminal J4.
Preferably, the battery comprises a lithium battery.
Preferably, step S2 specifically includes the following steps:
s21, when the power supply is alternating current and the absolute value of the instantaneous voltage is greater than that
When the control is carried out according to the following formula,
s22, when the power supply is alternating current and the absolute value of the instantaneous voltage is less than or equal to
When the control is carried out according to the following formula,
wherein, 4 crossoversThe current switch unit realizes short-circuit energy storage, and the duty ratio or the short-circuit energy storage time in the charging state accounts for
The percentage of the energy transmission time is
Vin is the absolute value of the instantaneous voltage of the power supply;
and S23, when the power supply is direct current, the duty ratio relation between the power supply voltage and the alternating current switch is the same as that of the step S21 and the step S22.
Preferably, in step S2, the H-bridge inverter is rectified by active rectification or passive rectification implemented by body diodes, and when the active rectification is adopted, the conduction time is not longer than
And a control signal is applied.
The invention has the beneficial effects that:
1. a high-frequency chain transmission and transformation mode is adopted, and carrier, modulation and demodulation are involved; in the inversion state, carrier modulation is completed on the battery side of the high-frequency transformer, active inversion is completed on the load charging side, an alternating current switch structure is applied on the load charging side, the battery current can realize the operation of two quadrants, the voltage waveform cannot be distorted, the high-frequency transformer is suitable for inductive loads, the output end can not only output current, but also absorb current under the conforming condition, and the energy is transferred to the battery; in the charging state, rectification is completed on the battery side of the high-frequency transformer, inversion is performed on the load charging side to complete conversion from direct current to alternating current or from alternating current to alternating current, current control is adopted in the charging state, no modulation and demodulation link is provided, portability is improved, fewer power devices are required, a circuit is simple, and reliability is high;
2. the direct current of the direct current low-voltage battery can be converted into sine-wave power frequency alternating current through the current converting circuit, and an alternating current power supply is provided for an electric appliance; the reverse flow of electric energy can be realized through the same converter circuit, and the battery in the device is charged by alternating current 220V commercial power or direct current of a solar photovoltaic cell panel, and the like, namely the bidirectional flow of electric energy can be completed by the same converter device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic connection diagram of the present invention;
FIG. 2 is a schematic diagram of the control waveforms of the H-bridge inverter in the inversion state of the present invention;
FIG. 3 is a schematic diagram of the control waveforms of the AC switching device during the inversion state of the present invention;
FIG. 4 is a schematic diagram of the working timing sequence of the present invention in which the power supply is AC and the absolute value of the voltage is less than or equal to the threshold value in the charging state;
FIG. 5 is a schematic diagram of the working timing sequence of the present invention in which the power supply is AC and the absolute value of the voltage is greater than the threshold value in the charging state;
FIG. 6 is a schematic diagram of the working sequence of the present invention in which the power supply is DC in the charging state;
fig. 7 is a schematic diagram of the control waveforms for the active rectification of the H-bridge inverter during the charging state of the present invention.
Detailed Description
Example one
As shown in fig. 1, the present application provides a sine wave high frequency chain battery inversion method for realizing a first two-quadrant operation, which is applied to an inverter device, and the inverter device includes:
battery BT1, comprising a 48V lithium battery or other grade lithium battery;
h bridge inverter, including a plurality of MOS pipes and parallel connection form the topological structure of H bridge contravariant, H bridge inverter and battery BT1 electric connection, and realize the contravariant function when being used for the device contravariant, realize carrier wave and modulation when contravariant, realize the rectification function when charging. The H-bridge inverter includes 4 banks A, B, C, D each including n MOS transistors and a body diode connected in parallel and constitutes an H-bridge topology.
High frequency transformer T1, comprisingThe secondary winding and the secondary winding have the turn ratio of N1 to N2 and the turn ratio
Wherein Vbattery is the battery voltage. The high-frequency transformer T1 is used for realizing bidirectional magnetization operation, and a primary winding is connected with the H-bridge inverter.
The alternating current switching device comprises 8 IGBTs or MOS tubes which are connected to form a complete self-turn-off H-bridge topological structure and is used for realizing bidirectional flow of current, and the alternating current switching device is electrically connected with the secondary winding. The 8 IGBTs or MOS tubes are divided into 4 alternating current switch units E, F, G, H and are connected into a complete self-turn-off H-bridge topological structure, and the emitter or the source of the 2 IGBTs or MOS tubes in each alternating current switch unit are connected and the base or the grid is connected. When the device is in an inversion state, completing a demodulation process, belonging to AC/AC conversion; when the device is in a charging state, the direct-alternating current DC \ AC or alternating-alternating current AC \ AC is completed, and the energy flows to the direction of the battery BT1 through corresponding control.
The filter circuit is electrically connected with the alternating current switching device, is used for converting intermittent square waves into continuous sine waves in an inversion state and enabling the reactive current to be smoothly fed back to the battery BT1, and is used for limiting current and storing energy in a charging state.
Based on the inverter, the sine wave high-frequency chain battery inverter method for realizing the first two-quadrant operation comprises the following steps:
s1, when the inverter is in an inversion state, a battery BT1 is used as an electric energy source, is inverted by an H-bridge inverter to be converted into square-wave alternating current carrying sine wave information, is boosted by a high-frequency transformer T1, is demodulated and extracted according to phases by an alternating-current switching device, is filtered by a filter circuit, and is converted into the sine-wave alternating current according to impulse theorem.
As shown in fig. 2, for tube set A, B, C, D, once per cycle, tube set A, D is in phase, tube set B, C is in phase, tube set A, D and tube set B, C are complementary 180 ° out of phase, AD and BC have dead time td, and the on operating time of tube set A, B, C, D satisfies the following equation:
where Φ is the sine wave phase, Vbattery is the battery voltage, N1 is the primary winding turns, N2 is the secondary winding turns,
is the duty cycle of the modulated waveform pulse width PWM.
As shown in fig. 3, the power output terminal of the ac switching device should be 0 or 1, and there is no open circuit, i.e. high impedance state output. The ac switching units E, H are in phase and F, G are in phase, E, H and F, G have dead time. The on-duty time of ac switch unit E, F, G, H satisfies the following equation:
the on-time is:
the turn-off time is:
where T is the carrier period and td is the dead time. Its on and off time and duty ratio
In relation, the dead time td is a fixed value; when the ac half-wave is inverted, the on timing of E, F, G, H changes as shown in fig. 3.
S2, when the inverter is in a charging state, judging the current direction by short circuit of a group of 2 upper and lower bridge arm alternating current switch units in the alternating current switch device, controlling the 2 upper and lower bridge arm alternating current switch units to be alternately conducted to form alternating current square wave voltage to supply power to a load charging side of a high-frequency transformer T1, transmitting energy to an H bridge inverter at a battery side by the high-frequency transformer T1, and charging the battery BT1 after rectification.
In step S2, the method specifically includes the following steps:
s21, when the power supply is alternating current and the absolute value of the instantaneous voltage is greater than that
When the power supply voltage passes through the high-frequency transformer T1, the voltage is higher than the battery voltage, and the external power supply can be used for directly charging the battery BT 1. The operation time of the ac switching unit should be controlled according to the following formula,
higher absolute value of supply voltage, duty cycle
The smaller; the alternating current switch unit E, F, G, H is controlled in a bridge inversion mode, E, H and F, G work for 1 time respectively in one period, and the phase difference is 180 degrees; the control mode adopts a current control mode; when the ac power supply is converted into phase, the corresponding operation timing is adjusted as shown in fig. 5.
S22, when the power supply is alternating current and the absolute value of the instantaneous voltage is less than or equal to
When the power supply voltage passes through the high-frequency transformer T1, the voltage is lower than or equal to the battery voltage, and the battery BT1 cannot be charged by external power supply. The control mode of the BOOST principle is adopted, the alternating current switch unit is firstly short-circuited, the energy is stored in the inductor, then the alternating current switch unit works in an inversion state, the energy is released, and the working time of the alternating current switch unit is controlled according to the following formula:
wherein, 4 AC switch units realize short-circuit energy storage, and the duty ratio or short-circuit energy storage time in the charging state accounts for
The percentage of the energy transmission time is
Vin is the absolute value of the instantaneous voltage of the power supply. The lower the absolute value of the supply voltage is,
the larger the voltage-boosting ratio
(ii) a In one control cycle, the ac switching unit E, F, G, H is short-circuited 2 times, and each of the ac switching units E, H and F, G is operated 1 time. The control mode adopts a current control mode. When the ac power supply is converted into phase, the corresponding operation timing is adjusted as shown in fig. 4.
And S23, when the power supply is direct current, the duty ratio relation between the power supply voltage and the alternating current switch is the same as that of the step S21 and the step S22. The difference is that there is no commutation, the control is relatively simple, and the control waveform is as shown in fig. 6.
Example two
The present embodiment is different from the first embodiment in that: the filter circuit comprises a first inductor L1, a second inductor L2 and a third capacitor C30, the filter circuit is connected with a current sensor I, one end of the third capacitor C30 is connected with one end, far away from the current sensor I, of the first inductor L1 and a third output end J3, and the other end of the third capacitor C30 is connected with one end, far away from the alternating current switching device, of the second inductor L2 and a fourth output end J4.
In step S2, the H-bridge inverter adopts an active rectification mode, that is, the tube group A, B, C, D is in an active rectification state, the control waveform is as shown in fig. 7, the switching timing is controlled by the output polarity of the transformer, and the switching time in one cycle is controlled by the duty ratio of the charging load side
Determined and the on-time is less than or equal to
。
EXAMPLE III
The present embodiment is different from the second embodiment in that: in step S2, the rectification mode of the H-bridge inverter is a passive rectification mode implemented by a body diode, which is lower in efficiency and larger in heat generation amount than the second embodiment.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (8)
1. A sine wave high-frequency chain battery inversion method for realizing first and second quadrant operation is applied to an inversion device, wherein the inversion device comprises a battery; the H-bridge inverter comprises a plurality of MOS (metal oxide semiconductor) tubes and is connected in parallel to form a topological structure of H-bridge inversion, is electrically connected with the battery and is used for realizing an inversion function when the device is inverted and a rectification function when the device is charged; the high-frequency transformer comprises a primary winding and a secondary winding, the turn ratio is N1: N2, the high-frequency transformer is used for realizing bidirectional magnetization work, and the primary winding is connected with an H-bridge inverter; the alternating current switching device comprises 8 IGBTs or MOS tubes which are connected to form a complete self-turn-off H-bridge topological structure and is used for realizing the bidirectional flow of current, and the alternating current switching device is electrically connected with the secondary winding; the filter circuit is electrically connected with the alternating current switching device, is used for converting the intermittent square waves into continuous sine waves in an inversion state and enabling the idle current to be fed back to the battery smoothly, and is used for limiting current and storing energy in a charging state;
the method is characterized in that: the sine wave high-frequency chain battery inversion method for realizing the first two-quadrant operation comprises the following steps:
s1, when an inverter is in an inversion state, a battery is used as an electric energy source, is inverted by an H-bridge inverter and is converted into square wave alternating current carrying sine wave information, the square wave alternating current is boosted by a high-frequency transformer, the content carrying the sine wave information is demodulated and extracted according to phases by an alternating current switching device, is filtered by a filter circuit and is converted into the sine wave alternating current according to impulse theorem;
the device should meet the requirement in the inversion process
Where Φ is the sine wave phase, Vbattery is the battery voltage, N1 is the number of primary winding turns, N2 is the number of secondary winding turns,
duty ratio of PWM;
the alternating current switching device satisfies: the on-time is:
the turn-off time is:
wherein T is a carrier period and td is a dead time;
and S2, when the inverter is in a charging state, judging the current direction by short circuit of a group of 2 upper and lower bridge arm alternating current switch units in the alternating current switch device, controlling the 2 groups of 4 upper and lower bridge arm alternating current switch units to be alternately conducted to form alternating current square wave voltage to supply power to the battery side of the high-frequency transformer, transmitting the energy to the H-bridge inverter on the battery side by the high-frequency transformer, and charging the battery after rectification.
2. The sine wave high frequency chain battery inversion method for realizing the first two-quadrant operation according to claim 1, characterized in that: the H-bridge inverter comprises 4 tube groups A, B, C, D and constitutes an H-bridge topology, the tube group A, D is in phase, the tube group B, C is in phase, the tube group A, D and the tube group B, C are complementary 180 ° out of phase, each tube group comprises n MOS tubes and body diodes connected in parallel.
3. The sine wave high frequency chain battery inversion method for realizing the first two-quadrant operation according to claim 1, characterized in that: the turns ratio of the primary winding to the secondary winding
Wherein Vbattery is the battery voltage.
4. The sine wave high frequency chain battery inversion method for realizing the first two-quadrant operation according to claim 1, characterized in that: the 8 IGBTs or MOS tubes are divided into 4 alternating current switch units E, F, G, H and are connected into a complete self-turn-off H-bridge topological structure, and the emitter or the source of the 2 IGBTs or MOS tubes in each alternating current switch unit are connected and the base or the grid is connected.
5. The sine wave high frequency chain battery inversion method for realizing the first two-quadrant operation according to claim 1, characterized in that: the filter circuit comprises a first inductor L1, a second inductor L2 and a third capacitor C30, the filter circuit is connected with a current sensor I, one end of the third capacitor C30 is connected with the first inductor L1 and is far away from one end of the current sensor I and a third output end J3, the other end of the third capacitor C30 is connected with the second inductor L2 and is far away from one end of an alternating current switching device and a fourth output end J4, the other end of the first inductor LI is connected with the current sensor I, and the other end of the second inductor L2 is connected with the alternating current switching device.
6. The sine wave high frequency chain battery inversion method for realizing the first two-quadrant operation according to claim 1, characterized in that: the battery includes a lithium battery.
7. The sine wave high frequency chain battery inversion method for realizing the first two-quadrant operation according to claim 1, characterized in that: in step S2, the method specifically includes the following steps:
s21, when the power supply is alternating current and the absolute value of the instantaneous voltage is greater than that
When the control is carried out according to the following formula,
s22, when the power supply is alternating current and the absolute value of the instantaneous voltage is less than or equal to
When the control is carried out according to the following formula,
wherein, 4 AC switch units realize short-circuit energy storage, and the duty ratio or short-circuit energy storage time in the charging state accounts for
The percentage of the energy transmission time is
Vin is the absolute value of the instantaneous voltage of the power supply;
and S23, when the power supply is direct current, the duty ratio relation between the power supply voltage and the alternating current switch is the same as that of the step S21 and the step S22.
8. The sine wave high frequency chain battery inversion method for realizing the first two-quadrant operation according to claim 1, characterized in that: in step S1, the H-bridge inverter is rectified by active rectification or passive rectification via a body diode, and when the active rectification is adopted, the conduction time is less than or equal to
And a control signal is applied thereto and,
the duty ratio or short-circuit energy storage time in the charging state accounts for percentage.
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| CN101997323A (en) * | 2009-08-05 | 2011-03-30 | 通用汽车环球科技运作公司 | Charging system with galvanic isolation and multiple operating modes |
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