CN116742986A - Voltage conversion circuit, power supply device, voltage conversion method, device and equipment - Google Patents
Voltage conversion circuit, power supply device, voltage conversion method, device and equipment Download PDFInfo
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- CN116742986A CN116742986A CN202310885429.2A CN202310885429A CN116742986A CN 116742986 A CN116742986 A CN 116742986A CN 202310885429 A CN202310885429 A CN 202310885429A CN 116742986 A CN116742986 A CN 116742986A
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- 230000002457 bidirectional effect Effects 0.000 abstract description 10
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Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- H02M3/01—Resonant DC/DC converters
-
- 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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without 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
- H02M7/217—Conversion of ac power input into dc power output without 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
- H02M7/2173—Conversion of ac power input into dc power output without 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 in a biphase or polyphase circuit arrangement
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without 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
- H02M7/217—Conversion of ac power input into dc power output without 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
- H02M7/219—Conversion of ac power input into dc power output without 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 in a bridge configuration
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The application relates to a voltage conversion circuit, a power supply device, a voltage conversion method, a voltage conversion device and a voltage conversion device. The voltage conversion circuit includes: the device comprises a rectifying circuit, a sampling circuit, a resonant conversion circuit and a controller; the sampling circuit is connected between the output end of the rectifying circuit and the input end of the resonance conversion circuit, and the rectifying circuit, the sampling circuit and the resonance conversion circuit are all connected with the controller; the controller is used for collecting the output current of the rectifying circuit according to the sampling circuit and controlling the output voltage of the resonant conversion circuit. The cost of the bidirectional power supply can be reduced by the voltage conversion circuit.
Description
Technical Field
The present application relates to the field of power electronics, and in particular, to a voltage conversion circuit, a power supply device, a voltage conversion method, a device, and an apparatus.
Background
A bidirectional power supply is a device for exchanging energy between alternating current and direct current, and is increasingly applied to the fields of energy storage, battery formation, electric automobile, aviation power supply and the like.
In the related art, a bidirectional power supply often needs to set up a sampling circuit to sample input and output voltages of other circuits in the power supply so as to control the output voltage of the bidirectional power supply in real time and realize conversion between different voltages.
However, in the related art, for some high current scenarios, sampling is required by using a sampling circuit with a higher power level, resulting in higher cost of the bidirectional power supply.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a voltage conversion circuit, a power supply device, a voltage conversion method, a device, and a device that can reduce the cost of a bidirectional power supply.
In a first aspect, the present application provides a voltage conversion circuit comprising: the device comprises a rectifying circuit, a sampling circuit, a resonant conversion circuit and a controller; the sampling circuit is connected between the output end of the rectifying circuit and the input end of the resonance conversion circuit, and the rectifying circuit, the sampling circuit and the resonance conversion circuit are all connected with the controller;
and the controller is used for collecting the output current of the rectifying circuit according to the sampling circuit and controlling the output voltage of the resonant conversion circuit.
In one embodiment, the sampling circuit includes a sampling resistor;
and the controller is used for determining the output current of the rectifying circuit according to the voltages at the two ends of the sampling resistor and the resistance value of the sampling resistor.
In one embodiment, the resonant conversion circuit comprises a frequency adjusting circuit, an isolation transformer and a secondary synchronous rectification circuit, wherein a first end of the frequency adjusting circuit is respectively connected with the sampling circuit and an output end of the controller, a second end of the frequency adjusting circuit is connected with a primary side of the isolation transformer, a secondary side of the isolation transformer is connected with an input end of the secondary synchronous rectification circuit, and an output end of the secondary synchronous rectification circuit is connected with an input end of the controller;
And the controller is used for controlling the switching frequency of the frequency adjusting circuit and controlling the on and off of the secondary synchronous rectifying circuit according to the output current of the rectifying circuit and the output voltage of the secondary synchronous rectifying circuit which are acquired by the sampling circuit.
In one embodiment, the frequency adjusting circuit comprises a primary side switch circuit and a resonant cavity circuit, wherein a first end of the primary side switch circuit is connected with the sampling circuit, a second end of the primary side switch circuit is respectively connected with an output end of the controller and a first end of the resonant cavity circuit, and a second end of the resonant cavity circuit is connected with a primary side of the isolation transformer;
and the controller is used for controlling the on-off time of the primary side switch circuit according to the output current of the sampling circuit acquisition rectifying circuit and the output voltage of the secondary side synchronous rectifying circuit.
In one embodiment, the primary side switching circuit comprises a first switching tube and a second switching tube, the grid electrodes of the first switching tube and the second switching tube are both connected with the output end of the controller, the drain electrode of the first switching tube and the source electrode of the second switching tube are both connected with the sampling circuit, and the source electrode of the first switching tube and the drain electrode of the second switching tube are both connected with the resonant cavity circuit.
In one embodiment, the resonant cavity circuit comprises a resonant inductor, a resonant capacitor and a transformer excitation inductor, wherein a first end of the resonant inductor is connected with a source electrode of the first switching tube and a drain electrode of the second switching tube, a second end of the resonant inductor is connected with a first end of the resonant capacitor, a second end of the resonant capacitor is connected with a first end of the transformer excitation inductor, a second end of the transformer excitation inductor is connected with a drain electrode of the second switching tube, and the transformer excitation inductor is connected with a primary side of the isolation transformer in parallel.
In one embodiment, the secondary synchronous rectification circuit comprises a third switching tube, a fourth switching tube and an output filter capacitor, wherein the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are connected with the output end of the controller, the source electrode of the third switching tube is connected with the first end of the secondary side of the isolation transformer circuit, the source electrode of the fourth switching tube is connected with the second end of the secondary side of the isolation transformer circuit, the drain electrode of the third switching tube is connected with the first end of the output filter capacitor, and the drain electrode of the fourth switching tube is connected with the second end of the output filter capacitor.
In one embodiment, the rectifying circuit comprises a rectifying and filtering circuit and a rectifying bridge circuit, wherein a first end of the rectifying and filtering circuit is connected with the alternating current power grid, a second end of the rectifying and filtering circuit is connected with a first end of the rectifying and filtering circuit and an input end of the controller, and a second end of the rectifying and filtering circuit is connected with the sampling circuit and the input end of the controller;
And the controller is used for controlling the on and off of each power switching tube in the rectifier bridge circuit according to the output current and the output voltage of the rectifier filter circuit and the output current of the sampling circuit acquired by the rectifier circuit.
In one embodiment, the rectifying and filtering circuit comprises three-phase rectifying and filtering circuits, each phase of rectifying and filtering circuit comprises a grid-connected side inductor, a filtering capacitor and an inversion side inductor, a first end of the grid-connected side inductor is connected with an alternating current power grid, a second end of the grid-connected side inductor is connected with a first end of the filtering capacitor and a first end of the inversion side inductor, and a second end of the inversion side inductor is connected with the rectifying bridge circuit; the second end of the filter capacitor is grounded.
In one embodiment, the rectifier bridge circuit comprises a three-phase rectifier bridge circuit and a rectifier filter capacitor, each phase rectifier bridge circuit comprises a first power switch tube and a second power switch tube, bases of the first power switch tube and the second power switch tube are connected with an output end of the controller, an emitting electrode of the first power switch tube and a collecting electrode of the second power switch tube are connected with a second end of the rectifier filter circuit, a collecting electrode of the first power switch tube is connected with a first end of the rectifier filter capacitor, and the second power switch tube and the emitting electrode are connected with a second end of the rectifier filter capacitor.
In a second aspect, the present application also provides a power supply apparatus including the contents of any one of the above voltage conversion circuits.
In a third aspect, the present application also provides a voltage conversion method, the method comprising:
collecting current output by a rectifying circuit through a sampling circuit;
the output voltage of the resonant conversion circuit is controlled based on the output current of the rectifying circuit.
In one embodiment, collecting, by a sampling circuit, a current output by a rectifying circuit includes:
acquiring sampling voltages and resistance values of two ends of a sampling resistor in a sampling circuit;
and taking the ratio of the sampling voltage to the resistance value of the resistor as the current output by the rectifying circuit.
In one embodiment, controlling an output voltage of the resonant conversion circuit based on an output current of the rectification circuit includes:
controlling an output voltage of the rectifying circuit based on an output current of the rectifying circuit;
the output voltage of the resonant conversion circuit is controlled based on the output current of the rectifying circuit and the output voltage of the rectifying circuit.
In one embodiment, controlling an output voltage of a rectifying circuit based on an output current of the rectifying circuit includes:
acquiring a voltage difference between the output voltage of the rectifying circuit and a target output voltage of the rectifying circuit;
Outputting a first pulse width modulation signal based on the voltage difference; the first pulse width modulation signal is used for controlling the on and off of each bridge arm of a rectifier bridge circuit in the rectifier circuit so as to control the output voltage of the rectifier circuit.
In one embodiment, the voltage difference, outputting a first pulse width modulated signal, comprises:
determining a rectification voltage adjustment coefficient corresponding to the voltage difference value of the rectification circuit based on the voltage difference value of the rectification circuit;
and determining the duty ratio of the first pulse width modulation signal based on the current of the rectifying circuit and the rectifying voltage adjustment value, and outputting the first pulse width modulation signal.
In one embodiment, controlling the output voltage of the resonant conversion circuit based on the output current of the rectification circuit and the output voltage of the rectification circuit includes:
acquiring a voltage difference between the output voltage of the resonant conversion circuit and the target output voltage under the condition that the difference between the output voltage of the rectification circuit and the target output voltage is smaller than a preset voltage difference;
outputting a second pulse width modulation signal according to the voltage difference value of the resonant conversion circuit and the output current of the rectification circuit; the second pulse width modulation signal is used for controlling the switching frequency of the frequency adjusting circuit in the resonant conversion circuit so as to control the output voltage of the resonant conversion circuit.
In one embodiment, outputting the second pwm signal according to the voltage difference of the resonant conversion circuit and the output current of the rectifying circuit includes:
acquiring a voltage adjustment coefficient corresponding to the voltage difference value based on the voltage difference value of the resonant conversion circuit;
based on the current difference value of the rectifying circuit, acquiring a current adjustment coefficient corresponding to the current difference value; the current difference value is the current difference value between the output current of the rectifying circuit and the target current; the target current is determined according to the voltage adjustment coefficient;
and determining the frequency of the second pulse width modulation signal based on the voltage adjustment coefficient and the current adjustment coefficient, and outputting the second pulse width modulation signal.
In a fourth aspect, the present application also provides a voltage conversion device, including:
the acquisition module is used for acquiring the current output by the rectifying circuit through the sampling circuit;
and the control module is used for controlling the output voltage of the resonant conversion circuit based on the output current of the rectifying circuit.
In a fifth aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the contents of any one of the voltage conversion methods of the third aspect described above when the processor executes the computer program.
In a sixth aspect, the present application also provides a computer readable storage medium. A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the contents of any one of the voltage conversion methods of the third aspect described above.
In a seventh aspect, the present application also provides a computer program product. A computer program product comprising a computer program which when executed by a processor implements the contents of any one of the voltage conversion methods of the third aspect described above.
The voltage conversion circuit, the power supply equipment, the voltage conversion method, the voltage conversion device and the voltage conversion equipment comprise a rectifying circuit, a sampling circuit, a resonance conversion circuit and a controller; the sampling circuit is connected between the output end of the rectifying circuit and the input end of the resonance conversion circuit, and the rectifying circuit, the sampling circuit and the resonance conversion circuit are all connected with the controller; and the controller is used for collecting the output current of the rectifying circuit according to the sampling circuit and controlling the output voltage of the resonant conversion circuit. The sampling circuit in the voltage conversion circuit is connected in series between the rectifying circuit and the resonance conversion circuit, and the output voltage of the rectifying circuit is far greater than that of the resonance conversion circuit, so that the output current of the rectifying circuit is far smaller than that of the resonance conversion circuit, the sampling circuit is arranged at the output end of the rectifying circuit, the acquired output current is smaller, the sampling circuit with high power level is not required, and the cost of the bidirectional power supply is reduced.
Drawings
FIG. 1 is a circuit diagram of a voltage conversion circuit in one embodiment;
FIG. 2 is a circuit diagram of a conventional voltage conversion circuit in one embodiment;
FIG. 3 is a circuit diagram of a sampling circuit in one embodiment;
FIG. 4 is a circuit diagram of a resonant conversion circuit in one embodiment;
FIG. 5 is a circuit diagram of a frequency adjustment circuit in one embodiment;
FIG. 6 is a circuit diagram of an on-edge switching circuit in one embodiment;
FIG. 7 is a circuit diagram of a resonant cavity circuit in one embodiment;
FIG. 8 is a circuit diagram of a secondary synchronous rectification circuit in one embodiment;
FIG. 9 is a circuit diagram of a rectifier circuit in one embodiment;
FIG. 10 is a circuit diagram of a rectifying and filtering circuit in one embodiment;
FIG. 11 is a circuit diagram of a rectifier bridge circuit in one embodiment;
FIG. 12 is a schematic diagram of a first process of a voltage transformation method according to one embodiment;
FIG. 13 is a schematic diagram of a second process of the voltage transformation method according to one embodiment;
FIG. 14 is a third flow chart of a voltage conversion method according to an embodiment;
FIG. 15 is a fourth flow chart of a voltage conversion method according to an embodiment;
FIG. 16 is a fifth flow chart of a voltage conversion method according to an embodiment;
FIG. 17 is a schematic diagram of a three-two transformation in one embodiment;
FIG. 18 is a control circuit diagram of the output voltage of the rectifier circuit in one embodiment;
FIG. 19 is a sixth flow chart of a voltage conversion method according to an embodiment;
FIG. 20 is a seventh flowchart of a voltage conversion method according to an embodiment;
FIG. 21 is a circuit diagram of the control of the output voltage of the resonant conversion circuit in one embodiment;
FIG. 22 is a schematic diagram of an eighth flowchart of a voltage conversion method in one embodiment;
FIG. 23 is a schematic diagram showing a structure of a voltage converting apparatus according to an embodiment;
fig. 24 is an internal structural view of a computer device in one embodiment.
Reference numerals illustrate:
10: a voltage conversion circuit; 11: a rectifying circuit; 111: a rectifying and filtering circuit; l (L) g : grid-connected side inductance; l (L) gA : grid-connected side inductance of A phase; l (L) gB : grid-connected side inductance of the B phase; l (L) gC : grid-connected side inductance of the C phase; c: a filter capacitor; c (C) A : a filter capacitor of phase A; c (C) B : a filter capacitor of phase B; c (C) C : a filter capacitor of phase C; l: an inversion side inductance; l (L) A : an inversion side inductance of the A phase; l (L) B : an inverter side inductance of phase B; l (L) C : an inversion side inductance of the C phase; 112: a rectifier bridge circuit; 1121: a three-phase rectifier bridge circuit; q1: a first power switching tube; q2: a second power switching tube; q3: a third power switching tube; q4: a fourth power switching tube; q5: a fifth power switching tube;
Q6: a sixth power switching tube; c (C) bus : a rectifying filter capacitor;
12: a sampling circuit; r: sampling a resistor;
13: a resonant conversion circuit; 131: a frequency adjustment circuit;
1311: a primary side switching circuit; m1: a first switching tube;
m2: a second switching tube; 1312: a resonant cavity circuit;
L r : a resonant inductance; c (C) r : a resonance capacitor;
L m : excitation inductance of the transformer; t: an isolation transformer;
132: a secondary side synchronous rectification circuit; m3: a third switching tube;
m4: a fourth switching tube; c (C) 0 : an output filter capacitor;
14: a controller; 15: an isolation circuit;
20: an existing voltage conversion circuit; AC: an alternating current grid;
15: an isolation circuit; 20: an existing voltage conversion circuit;
I a : a current of phase a; i b : current of phase B;
I c : a current of phase C; v (V) a : the voltage of phase a;
V b : the voltage of phase B; v (V) c : the voltage of phase C;
V d : d-phase voltage; v (V) q : q-phase voltage;
I d : d-phase current; i q : q-phase current;
V bus : an output voltage of the rectifying circuit; v (V) busref : a target output voltage of the rectifying circuit;
V 0 : an output voltage of the resonant conversion circuit; v (V) 0ref : a target output voltage;
G v : a voltage adjustment coefficient; i bus : an output current of the rectifying circuit;
G i : a current adjustment coefficient; VCO: a voltage controlled oscillator.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, fig. 1 presents a circuit diagram of a voltage conversion circuit, the voltage conversion circuit 10 comprising a rectifying circuit 11, a sampling circuit 12, a resonant conversion circuit 13 and a controller 14; the sampling circuit 12 is connected between the output end of the rectifying circuit 11 and the input end of the resonance converting circuit 13, and the rectifying circuit 11, the sampling circuit 12 and the resonance converting circuit 13 are all connected with the controller 14; and a controller 14 for controlling the output voltage of the resonant conversion circuit 13 according to the output current of the rectifier circuit 11 collected by the sampling circuit 12.
The purpose of the voltage conversion circuit 10 is to convert the input ac voltage of the rectifier circuit 11 into the output dc voltage of the resonant conversion circuit 13. The sampling circuit 12 in the voltage conversion circuit 10 is used for obtaining the output current of the rectifying circuit 11, and the rectifying circuit 11 in the voltage conversion circuit 10 is used for converting the alternating current output by the alternating current power grid into direct current, and the voltage of the direct current is a target direct current voltage output by a preset rectifying circuit 11. The resonance conversion circuit 13 converts the output voltage of the rectifier circuit 11 into a target dc voltage required for a load.
The input end of the rectifying circuit 11 is connected to an ac power grid, the output end of the rectifying circuit 11 is connected to a sampling circuit 12, the ac power grid outputs a single-phase ac voltage, a three-phase ac voltage and a multi-phase ac voltage, and the number of phases of the rectifying circuit 11 corresponding to ac voltages with different numbers of phases output by the ac power grid is also changed, for example, the single-phase ac voltage corresponds to the single-phase rectifying circuit, the three-phase ac voltage corresponds to the three-phase rectifying circuit, and the multi-phase ac voltage corresponds to the multi-phase rectifying circuit. The ac voltages of different phases are converted by the rectifying circuit 11 to obtain dc voltages. The rectifying circuit 11 mainly comprises rectifying diodes, and the rectifying circuit 11 can be a half-wave rectifying circuit, a full-wave rectifying circuit, a bridge rectifying circuit and the like, and the number of the diodes contained in the rectifying circuits of different types is different.
The sampling circuit 12 is provided between the rectifying circuit 11 and the resonance converting circuit 13, an input terminal of the sampling circuit 12 is connected to an output terminal of the rectifying circuit 11, and an output terminal of the sampling circuit 12 is connected to an input terminal of the resonance converting circuit 13. The sampling circuit 12 may include current sampling, voltage sampling, etc., where different sampling types are determined by different loads, and when the sampling circuit 12 is current sampling, the current output by the rectifying circuit 11 may be directly obtained; when the sampling circuit 12 is voltage sampling, the sampling circuit 12 sends the collected voltage to the controller 14, and the controller determines the current output by the rectifying circuit 11 according to the ratio of the collected voltage to the resistor.
Since the input terminal of the resonant conversion circuit 13 is connected to the sampling circuit 12 and the output terminal of the resonant conversion circuit 13 is connected to the load, the output voltage of the resonant conversion circuit 13 is a voltage applied to the load. The controller 14 controls the switching frequency in the resonant conversion circuit 13 to realize the constant output voltage of the resonant conversion circuit 13 when controlling the output voltage of the resonant conversion circuit 13.
An input end of the controller 14 is connected with the sampling circuit 12 and an output end of the resonance converting circuit 13, and an output end of the controller 14 is connected with an input end of the resonance converting circuit 13. The controller 14 adjusts the output voltage of the resonant conversion circuit 13 based on the output current of the rectifying circuit 11 acquired by the sampling circuit 12 so that the difference between the output voltage of the resonant conversion circuit 13 and the preset target output voltage is smaller than the preset range. The controller 14 may be, but is not limited to, a micro control unit (Micro Controller Unit, MCU), a central processing unit (Central Processing Unit, CPU), a digital signal processor (Digital Signal Processing, DSP), a programmable logic device (Field Programmable Gate Array, FPGA), a single chip microcomputer, or the like.
It should be noted that fig. 2 is a circuit diagram of a conventional voltage conversion circuit, and the sampling circuit 12 in the conventional voltage conversion circuit 20 is disposed at the output end of the resonant conversion circuit 13, and the output voltage of the resonant conversion circuit 13 is far smaller than the output voltage of the rectifying circuit 11, so that the power level required by the sampling circuit 12 is high. Meanwhile, since the resonant conversion circuit 13 is provided with an isolation converter, an isolation circuit 15 is also provided between the sampling circuit 12 and the controller 14. In order to solve the problem, the sampling circuit 12 is arranged between the rectifying circuit 11 and the resonant conversion circuit 13 in the voltage conversion circuit 10, the output voltage of the rectifying circuit 11 is larger, the current flowing through the sampling circuit 12 is smaller, and the sampling circuit with higher power class is not needed; meanwhile, an isolation circuit is not needed between the sampling circuit 12 and the controller 14, so that the cost of the voltage conversion circuit 10 is low.
The voltage conversion circuit comprises a rectifying circuit, a sampling circuit, a resonance conversion circuit and a controller; the sampling circuit is connected between the output end of the rectifying circuit and the input end of the resonance conversion circuit, and the rectifying circuit, the sampling circuit and the resonance conversion circuit are all connected with the controller; and the controller is used for collecting the output current of the rectifying circuit according to the sampling circuit and controlling the output voltage of the resonant conversion circuit. The sampling circuit in the voltage conversion circuit is connected in series between the rectifying circuit and the resonance conversion circuit, and the output voltage of the rectifying circuit is far greater than that of the resonance conversion circuit, so that the output current of the rectifying circuit is far smaller than that of the resonance conversion circuit, the sampling circuit is arranged at the output end of the rectifying circuit, the acquired output current is smaller, the sampling circuit with high power level is not required, and the cost of the bidirectional power supply is reduced.
On the basis of the above embodiment, the present embodiment is described with respect to the sampling circuit in the above voltage conversion circuit, and fig. 3 provides a circuit diagram of the sampling circuit, and the sampling circuit 12 in the voltage conversion circuit 10 includes the sampling resistor R; and a controller 14 for determining the output current of the rectifying circuit 11 based on the voltage across the sampling resistor R and the resistance value of the sampling resistor R.
In this embodiment, the sampling circuit 12 includes a sampling resistor R connected in series between the rectifying circuit 11 and the resonant conversion circuit 13, the positive terminal of the sampling resistor R being connected to the output terminal of the rectifying circuit 11, and the negative terminal of the sampling resistor R being connected to the input terminal of the resonant conversion circuit 13. The controller can acquire the resistance value of the sampling resistor R, and acquire the voltages at both ends of the sampling resistor R in real time, and take the ratio of the voltage at each moment to the resistance value of the sampling resistor R as the current at that moment, so that the output current flowing through the rectifying circuit 11 can be acquired in real time. The sampling resistor R can be selected according to the requirements of a specific circuit board, and for example, the sampling resistor R can be a PT type carbon film sampling resistor, a PJ type metal film sampling resistor, an RX type winding sampling resistor and the like.
The sampling circuit in the voltage conversion circuit comprises a sampling resistor; the controller is used for determining the output current of the rectifying circuit according to the voltages at two ends of the sampling resistor and the resistance value of the sampling resistor. In the circuit, as the output voltage of the rectifying circuit is larger, the sampling resistor is arranged between the rectifying circuit and the resonant conversion circuit, so that the high power of the sampling circuit is avoided, and the sampling can be finished only by one sampling resistor, so that the cost of the voltage conversion circuit is lower, and the hardware cost of the bidirectional power supply is reduced.
Based on the above embodiments, the present embodiment describes the resonant conversion circuit 13 in the voltage conversion circuit 10 in detail, fig. 4 is a circuit diagram of the resonant conversion circuit, where the resonant conversion circuit 13 includes a frequency adjustment circuit 131, an isolation transformer T, and a secondary synchronous rectification circuit 132, a first end of the frequency adjustment circuit 131 is connected to the output ends of the sampling circuit 12 and the controller 14, a second end of the frequency adjustment circuit 131 is connected to the primary side of the isolation transformer T, a secondary side of the isolation transformer T is connected to the input end of the secondary synchronous rectification circuit 132, and an output end of the secondary synchronous rectification circuit 132 is connected to the input end of the controller 14; the controller 14 is configured to control the switching frequency of the frequency adjustment circuit 131 and control the on and off of the secondary synchronous rectification circuit 132 according to the output current of the rectification circuit 11 and the output voltage of the secondary synchronous rectification circuit 132 collected by the sampling circuit 12.
In this embodiment, the frequency adjustment circuit 131 in the resonant conversion circuit 131 is used for converting the dc voltage into a sinusoidal current, and the controller 14 can adjust the switching frequency in the frequency adjustment circuit 131 to achieve the purpose of adjusting the gain of the resonant conversion circuit 13, so that the output voltage of the resonant conversion circuit 13 can be adjusted.
The isolation transformer T is used to transform the output voltage of the frequency adjustment circuit 131, and to isolate the output current of the frequency adjustment circuit 131 from the current of the load, and may include a core transformer, an amorphous alloy transformer, a shell transformer, and the like.
The secondary side synchronous rectification circuit 132 is used to adjust the output voltage of the secondary side of the isolation transformer so that the output voltage of the resonant conversion circuit 13 is close to the target output voltage required by the load. The secondary side synchronous rectification circuit 132 may be a switching circuit composed of a MOS transistor.
The resonant conversion circuit in the voltage conversion circuit comprises a frequency adjustment circuit, an isolation transformer and a secondary synchronous rectification circuit, wherein a first end of the frequency adjustment circuit is respectively connected with the output ends of the sampling circuit and the controller, a second end of the frequency adjustment circuit is connected with the primary side of the isolation transformer, the secondary side of the isolation transformer is connected with the input end of the secondary synchronous rectification circuit, and the output end of the secondary synchronous rectification circuit is connected with the input end of the controller; and the controller is used for controlling the switching frequency of the frequency adjusting circuit and controlling the on and off of the secondary synchronous rectifying circuit according to the output current of the rectifying circuit and the output voltage of the secondary synchronous rectifying circuit which are acquired by the sampling circuit. The output voltage of the rectifying circuit can be regulated by the frequency regulating circuit, the isolation transformer and the secondary synchronous rectifying circuit in the voltage converting circuit, so that the stability of the output voltage of the resonant converting circuit is ensured.
Based on the above embodiments, in this embodiment, the frequency adjusting circuit 131 of the resonant conversion circuit 13 in the voltage conversion circuit 10 is described in detail, and fig. 5 is a circuit diagram of the frequency adjusting circuit, where the frequency adjusting circuit 131 includes a primary side switch circuit 1311 and a resonant cavity circuit 1312, a first end of the primary side switch circuit 1311 is connected to the sampling circuit 12, a second end of the primary side switch circuit 1311 is connected to an output end of the controller 14 and a first end of the resonant cavity circuit 1312, and a second end of the resonant cavity circuit 1312 is connected to a primary side of the isolation transformer T; the controller 14 is configured to control on and off time of the primary side switching circuit according to the output current of the rectifier circuit 11 and the output voltage of the secondary side synchronous rectifier circuit 132 collected by the sampling circuit 12.
The primary side switching circuit 1311 may be implemented by a switching transistor, for example, a transistor, a MOS transistor, or the like, and the controller 14 turns on the switching transistor by supplying an on voltage to the switching transistor, so as to turn on a path between the rectifying circuit 11 and the resonant cavity circuit 1312. Alternatively, the primary side switching circuit may be implemented by some switching chips, and the controller 14 sends a control signal to the switching chips, and the switching chips control the conduction of the path between the rectifying circuit 11 and the resonant cavity circuit 1312 according to the control signal, which is not limited in the embodiment of the present application.
The resonant cavity circuit 1312 dynamically adjusts the output voltage of the resonant cavity circuit 1312 according to the switching frequency of the primary side switching circuit 1311, thereby achieving the purpose of controlling the output voltage. The resonant cavity circuit 1312 may be an LLC resonant cavity circuit, an LC parallel resonant filter, or an LC series resonant filter.
The frequency adjusting circuit of the resonant conversion circuit in the voltage conversion circuit comprises a primary side switch circuit and a resonant cavity circuit, wherein the first end of the primary side switch circuit is connected with the sampling circuit, the second end of the primary side switch circuit is respectively connected with the output end of the controller and the first end of the resonant cavity circuit, and the second end of the resonant cavity circuit is connected with the primary side of the isolation transformer; the controller is used for controlling the on-off time of the primary side switch circuit according to the output current of the sampling circuit acquisition rectifying circuit and the output voltage of the secondary side synchronous rectifying circuit. The primary side switch circuit is arranged in the voltage conversion circuit, so that the output direct-current voltage of the rectification circuit can be changed into equivalent alternating-current voltage; meanwhile, the resonant cavity circuit is arranged, so that the equivalent alternating voltage can be amplified or reduced in the same proportion according to the switching frequency of the primary side switching circuit.
Based on the above embodiments, the content of the primary side switch circuit 1311 is specifically described in this embodiment, fig. 6 is a circuit diagram of the primary side switch circuit, where the primary side switch circuit 1311 includes a first switch tube M1 and a second switch tube M2, the gate of the first switch tube M1 and the gate of the second switch tube M2 are both connected to the output end of the controller 14, the drain of the first switch tube M1 and the source of the second switch tube M2 are both connected to the sampling circuit 12, and the source of the first switch tube M1 and the drain of the second switch tube M2 are both connected to the resonant cavity circuit 1312.
In this embodiment, the first switching tube M1 and the second switching tube M2 are both NMOS tubes, and when the first switching tube M1 is turned on and the second switching tube M2 is turned off, the primary side switching circuit 1311 outputs a high level; when the first switching transistor M1 is turned off and the second switching transistor M2 is turned on, the primary side switching circuit 1311 outputs a low level. Whether the first switching tube M1 and the second switching tube M2 are turned on or not is determined according to the pulse frequency signal output from the controller 14.
The primary side switching circuit comprises a first switching tube and a second switching tube, wherein the grid electrode of the first switching tube and the grid electrode of the second switching tube are connected with the output end of the controller, the drain electrode of the first switching tube and the source electrode of the second switching tube are connected with the sampling circuit, and the source electrode of the first switching tube and the drain electrode of the second switching tube are connected with the resonant cavity circuit. The primary side switching circuit is a half-bridge inverter circuit formed by two switching tubes, and the on-off conditions of the two switching tubes are opposite, so that whether the output voltage of the rectifying circuit enters the resonant conversion circuit or not can be accurately controlled.
Based on the above embodiments, the present embodiment specifically describes the content of the resonant cavity circuit 1312, and fig. 7 is a circuit diagram of the resonant cavity circuit, where the resonant cavity circuit 1312 includes a resonant inductor L r Resonance capacitor C r And transformer excitation inductance L m Resonant inductance L r The first end of the first switch tube M1 is connected with the source electrode of the first switch tube M2 and the drain electrode of the second switch tube M2 respectively, and the resonant inductance L r And a second terminal of (C) and a resonance capacitor C r Is connected with the first end of the resonant capacitor C r And the second end of the transformer exciting inductance L m Is connected with the first end of the transformer exciting inductance L m A second end of the second switch tube M2 is connected with a drain electrode of the second switch tube, and a transformer excitation inductance L m Is connected in parallel with the primary side of the isolation transformer T. Wherein the resonant inductance L r And transformer excitation inductance L m Can be hollow inductance, ferrite inductance, iron core inductance or copper core inductance, etc., and resonant capacitor C r And can be ceramic capacitor, aluminum capacitor, tantalum capacitor, niobium capacitor, etc.
The resonant cavity circuit comprises a resonant inductor, a resonant capacitor and a transformer excitation inductor, wherein the first end of the resonant inductor is connected with the source electrode of the first switching tube and the drain electrode of the second switching tube, the second end of the resonant inductor is connected with the first end of the resonant capacitor, the second end of the resonant capacitor is connected with the first end of the transformer excitation inductor, the second end of the transformer excitation inductor is connected with the drain electrode of the second switching tube, and the transformer excitation inductor is connected with the primary side of the isolation transformer in parallel. The resonant cavity circuit adjusts the output voltage of the rectifying circuit through LLC resonance characteristics formed by the resonance inductance, the resonance capacitance and the transformer excitation inductance, so as to accurately control the output voltage of the whole circuit.
Based on the above embodiment, the content of the secondary synchronous rectification circuit 132 is specifically described in this embodiment, fig. 8 is a circuit diagram of the secondary synchronous rectification circuit, and the secondary synchronous rectification circuit 132 includes a third switching tube M3, a fourth switching tube M4 and an output filter capacitor C 0 Grid electrode of third switch tube M3The grid electrodes of the four switching tubes M4 are connected with the output end of the controller 14, the source electrode of the third switching tube M3 is connected with the first end of the secondary side of the isolation transformer circuit T, the source electrode of the fourth switching tube M4 is connected with the second end of the secondary side of the isolation transformer circuit T, the drain electrode of the third switching tube M3 is connected with the first end of the output filter capacitor, and the drain electrode of the fourth switching tube M4 is connected with the output filter capacitor C 0 Is connected to the second end of the first connector.
In this embodiment, the third switching tube M3 and the fourth switching tube M4 are both NMOS tubes, the on and off states of the third switching tube M3 and the first switching tube M1 are the same, and the on and off states of the fourth switching tube M4 and the second switching tube M2 are the same. The output voltage of the resonant cavity circuit is not purely direct current, and is quite different from direct current voltage, and the waveform contains a relatively large pulsation component, which is called ripple. In order to obtain a more ideal DC voltage, an output filter capacitor C with energy storage function is needed 0 To filter out ripple component in the output voltage of the resonant cavity circuit 1312 to obtain DC voltage V 0 . For example, the output filter capacitor C 0 Can be tantalum electrolytic capacitor, aluminum metallized polynitrile film capacitor, ceramic capacitor, mica capacitor or polyester film capacitor.
The secondary synchronous rectification circuit comprises a third switching tube, a fourth switching tube and an output filter capacitor, wherein the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are connected with the output end of the controller, the source electrode of the third switching tube is connected with the first end of the secondary side of the isolation transformer circuit, the source electrode of the fourth switching tube is connected with the second end of the secondary side of the isolation transformer circuit, the drain electrode of the third switching tube is connected with the first end of the output filter capacitor, and the drain electrode of the fourth switching tube is connected with the second end of the output filter capacitor. The circuit controls the on and off of the third switching tube and the fourth switching tube through the controller, so that the output voltage of the resonant conversion circuit can be accurately controlled; meanwhile, pulse components in the output voltage are filtered through the output filter capacitor, so that the more accurate output voltage is obtained.
Based on the above embodiment, the content of the rectifying circuit 11 is specifically described in this embodiment, fig. 9 is a circuit diagram of the rectifying circuit, where the rectifying circuit 11 includes a rectifying and filtering circuit 111 and a rectifying and bridge circuit 112, a first end of the rectifying and filtering circuit 111 is connected to an AC power grid AC, a second end of the rectifying and filtering circuit 111 is connected to a first end of the rectifying and bridge circuit 112 and an input end of the controller 14, and a second end of the rectifying and bridge circuit 112 is connected to input ends of the sampling circuit 12 and the controller 14; the controller 14 is configured to control on and off of each power switching tube in the rectifier bridge circuit 112 according to the output current and the output voltage of the rectifier filter circuit 111 and the output current of the rectifier circuit 11 collected by the sampling circuit 12.
In the present embodiment, the rectifying and filtering circuit 111 is configured to filter a high-frequency signal in the output voltage of the AC power grid AC, so as to avoid the influence of the high-frequency signal on the output voltage of the rectifying circuit 11. For example, the rectifying filter circuit 111 may be an LC filter circuit, an LCL filter circuit, or the like. The rectifier bridge circuit 112 includes a plurality of power switching tubes, and the controller 14 can accurately control the output voltage of the rectifier circuit 11 by controlling the on/off of each power switching tube in the rectifier bridge circuit 112. For example, the rectifier bridge circuit 112 may be a half-wave rectifier circuit, a full-wave rectifier circuit, or a full-bridge rectifier circuit.
The rectification circuit comprises a rectification filter circuit and a rectification bridge circuit, wherein the first end of the rectification filter circuit is connected with an alternating current power grid, the second end of the rectification filter circuit is connected with the first end of the rectification bridge circuit and the input end of the controller, and the second end of the rectification bridge circuit is connected with the sampling circuit and the input end of the controller; and the controller is used for controlling the on and off of each power switching tube in the rectifier bridge circuit according to the output current and the output voltage of the rectifier filter circuit and the output current of the sampling circuit acquired by the rectifier circuit. The rectification circuit carries out filtering treatment on three-phase voltage output by the alternating current power grid through the rectification filter circuit, avoids the influence of other signals in the alternating current power grid on the output voltage of the rectification circuit, and controls the on and off of each power switching tube in the rectification bridge circuit through the controller to accurately control the output voltage of the rectification circuit.
On the basis of the above embodiment, the present embodiment isDescribing the content of the rectifying and filtering circuit 111 in detail, fig. 10 is a circuit diagram of the rectifying and filtering circuit, where the rectifying and filtering circuit 111 includes three-phase rectifying and filtering circuits, each phase rectifying and filtering circuit includes a grid-connected inductor L g A filter capacitor C, an inversion side inductor L and a grid-connected side inductor L gA Is connected with an AC power grid AC, and is connected with a grid-connected side inductor L gA And a filter capacitor C A Is a first end of the inductor L at the inversion side A Is connected with the first end of the inverter side inductor L A Is connected to the rectifier bridge 112; filter capacitor C A Is grounded.
In this embodiment, since the AC output of the AC power grid is three-phase voltage, for each phase voltage, a corresponding filter circuit is required to perform filtering processing, and each phase filter circuit includes a grid-connected inductor L g The filtering capacitor C and the inversion side inductor L take three-phase voltages output by the AC power grid AC as A-phase, B-phase and C-phase voltages respectively as examples, and the filtering circuit corresponding to the A comprises the grid-connected side inductor L gA Filter capacitor C A And an inversion side inductance L A The filter circuit corresponding to B comprises a grid-connected side inductor L gB Filter capacitor C B And an inversion side inductance L B The filter circuit corresponding to C comprises a grid-connected side inductor L gC Filter capacitor C C And an inversion side inductance L C . The connection relation in the filter circuits of each phase is the same, and it should be noted that the filter capacitor C A A second terminal of (C), a filter capacitor B And a filter capacitor C C Is grounded.
The rectification filter circuit comprises three-phase rectification filter circuits, each phase of rectification filter circuit comprises a grid-connected side inductor, a filter capacitor and an inversion side inductor, a first end of the grid-connected side inductor is connected with an alternating current power grid, a second end of the grid-connected side inductor is connected with the first end of the filter capacitor and the first end of the inversion side inductor, and a second end of the inversion side inductor is connected with the rectification bridge circuit; the second end of the filter capacitor is grounded. Each phase of filter circuit in the rectifying filter circuit comprises a grid-connected side inductor, a filter capacitor and an inversion side inductor, and each phase of filter circuit can accurately carry out filter treatment on three-phase voltage output by an alternating current power grid, filter high-frequency signals in each phase of output voltage and ensure the stability of the output voltage of the rectifying circuit.
Based on the above embodiment, the present embodiment specifically describes the content of the rectifier bridge circuit 112, and fig. 11 is a circuit diagram of the rectifier bridge circuit, where the rectifier bridge circuit 112 includes a three-phase rectifier bridge circuit 1121 and a rectifier filter capacitor C bus Each phase of rectifier bridge circuit 1121 comprises a first power switch tube Q1 and a second power switch tube Q2, wherein the bases of the first power switch tube Q1 and the second power switch tube Q2 are connected with the output end of the controller 14, the emitter of the first power switch tube Q1 and the collector of the second power switch tube Q2 are connected with the second end of the rectifier filter circuit 111, and the collector of the first power switch tube Q1 and the rectifier filter capacitor C bus A first end of the second power switch tube Q2 is connected with the emitter and the rectifying filter capacitor C bus Is connected to the second end of the first connector.
In this embodiment, since the ac power grid outputs three-phase voltages, each phase voltage corresponds to a phase rectifying and filtering circuit and also corresponds to a phase rectifying bridge circuit, taking the three-phase voltages output by the ac power grid as the voltages of the a phase, the B phase and the C phase respectively as examples, the rectifying bridge circuit corresponding to the output voltage of the a phase includes a first power switch Q1 and a second power switch Q2, the rectifying bridge circuit corresponding to the output voltage of the B phase includes a third power switch Q3 and a fourth power switch Q4, and the rectifying bridge circuit corresponding to the output voltage of the C phase includes a fifth power switch Q5 and a sixth power switch Q6. After the output voltage of the alternating current power grid passes through the rectification filter circuit and the rectification bridge circuit, the output voltage of the alternating current power grid is transmitted to the rectification filter capacitor C bus Charging the rectifying filter capacitor C bus In the charging process, the rectifying and filtering capacitor C bus The voltage at the two sides is continuously increased until the voltage is equal to the target output voltage, and the controller stops the power supply to the rectifying filter capacitor C by controlling the turn-off of each power switching tube in the rectifying bridge circuit bus And (5) charging.
The rectifier bridge circuit comprises three-phase rectifier bridge circuits and rectifier filter capacitors, each phase of rectifier bridge circuit comprises a first power switch tube and a second power switch tube, bases of the first power switch tube and the second power switch tube are connected with an output end of the controller, an emitting electrode of the first power switch tube and a collecting electrode of the second power switch tube are connected with a second end of the rectifier filter circuit, a collecting electrode of the first power switch tube is connected with a first end of the rectifier filter capacitor, and a second power switch tube and the emitting electrode are connected with a second end of the rectifier filter capacitor. Each phase of rectifier bridge circuit in the rectifier bridge circuit comprises two power switch tubes, and the on and off of the power switch tubes in each phase of rectifier bridge circuit can be accurately controlled through the controller, so that the time for charging the rectifier filter capacitor can be accurately controlled.
In one embodiment, the present application further provides a power supply device, where the voltage conversion circuit is provided in the power supply device, and the power supply device is a bidirectional power supply, and can convert the ac power of the ac power grid into the dc power required by the load, and also convert the dc power required by the load into the ac power of the ac power grid.
In one embodiment, as shown in fig. 12, a voltage conversion method is provided, and the controller 14 in the voltage conversion circuit is exemplified as the method, which includes the following steps:
s101, collecting current output by a rectifying circuit through a sampling circuit.
In this embodiment, the controller may send a current collection instruction to the sampling circuit, and after the sampling circuit receives the current collection instruction, the sampling circuit collects the current output by the rectifying circuit, so as to obtain the current output by the rectifying circuit. Or the controller can also send a voltage acquisition instruction to the sampling circuit, the sampling circuit acquires the voltage output by the rectifying circuit after receiving the voltage acquisition instruction, the voltage output by the rectifying circuit is obtained, and the ratio between the voltage output by the rectifying circuit and the resistance value of the sampling circuit is determined as the current output by the rectifying circuit. The embodiment is not limited to the way in which the current output by the rectifying circuit is collected by the sampling circuit.
S102, controlling the output voltage of the resonant conversion circuit based on the output current of the rectification circuit.
In this embodiment, after the controller obtains the output current of the rectifying circuit, the controller controls the output voltage of the resonant conversion circuit according to the output current of the rectifying circuit, so that the voltage difference between the output voltage of the resonant conversion circuit and the target output voltage is smaller than a preset threshold.
In the voltage conversion method, the sampling circuit collects the current output by the rectifying circuit, and the output voltage of the resonant conversion circuit is controlled based on the output current of the rectifying circuit. The method can accurately control the output voltage of the resonant conversion circuit based on the current output by the rectification circuit, and ensure the accuracy of the output voltage of the resonant conversion circuit.
On the basis of the above embodiment, this embodiment specifically describes "the current output from the rectifier circuit is collected by the sampling circuit" in the above step S101, and as shown in fig. 13, the above step S101 further includes:
s201, sampling voltages and resistance values of two ends of a sampling resistor in a sampling circuit are obtained.
In this embodiment, the sampling resistor is connected to the output end of the rectifying circuit, and the controller may obtain, in real time, the sampled voltage at two ends of the sampling resistor, where the resistance value of the sampling resistor may be the rated resistance value of the sampling resistor. Since the output voltage of the rectifying circuit is larger, the current value flowing through the sampling resistor is smaller, and therefore the power level of the sampling resistor is not required to be higher.
S202, taking the ratio of the sampling voltage to the resistance value of the resistor as the current output by the rectifying circuit.
In this embodiment, after the controller obtains the sampled voltage and the resistance value of the resistor at both ends of the sampling resistor, the controller calculates the ratio of the sampled voltage to the resistance value of the resistor, and uses the obtained ratio result as the current output by the rectifying circuit.
In the voltage conversion method, the sampling voltage and the resistance value of the sampling resistor at two ends of the sampling circuit are obtained, and the ratio of the sampling voltage to the resistance value of the resistor is used as the current output by the rectifying circuit. According to the method, the sampling voltage and the resistance value of the resistor are obtained at two sides of the sampling resistor, and the current output by the rectifying circuit is accurately obtained according to a calculation formula among the voltage, the resistor and the current.
In addition to the above embodiment, in this embodiment, the "control the output voltage of the resonant conversion circuit based on the output current of the rectifier circuit" in the step S102 is specifically described, and as shown in fig. 14, the step S102 further includes:
s301, controlling the output voltage of the rectifying circuit based on the output current of the rectifying circuit.
In this embodiment, the controller may control each power switching tube of the rectifier bridge circuit in the rectifier circuit with the output circuit of the rectifier circuit as a standard, so that a difference between the output voltage of the rectifier circuit and a preset target output voltage of the rectifier circuit is smaller than a preset threshold. By adding bus current as the output current of the rectifying circuit under the control of the rectifying circuit, the dynamic response is improved by superimposing the bus current on the voltage loop output through a low-pass filter.
S302, controlling the output voltage of the resonant conversion circuit based on the output current of the rectification circuit and the output voltage of the rectification circuit.
In this embodiment, after the controller obtains the output voltage of the rectifying circuit, the controller converts the output voltage of the rectifying circuit into the output voltage of the resonant conversion circuit, and in this process, the controller needs to control the output voltage of the resonant conversion circuit so that the output voltage of the resonant conversion circuit is close to the target output voltage of the resonant conversion circuit.
In the above voltage conversion method, the output voltage of the rectifier circuit is controlled based on the output current of the rectifier circuit, and the output voltage of the resonant conversion circuit is controlled based on the output current of the rectifier circuit and the output voltage of the rectifier circuit. The method can accurately control the conversion process of the rectifying circuit based on the output current of the rectifying circuit so as to enable the output voltage of the rectifying circuit to be close to the target output voltage of the rectifying circuit, and can accurately control the conversion process of the resonant conversion circuit so as to enable the output voltage of the resonant conversion circuit to be close to the target output voltage of the resonant conversion circuit.
In addition to the above embodiment, in this embodiment, the "control the output voltage of the rectifying circuit based on the output current of the rectifying circuit" in the above step S301 is specifically described, and as shown in fig. 15, the above step S301 further includes:
S401, obtaining a voltage difference value between the output voltage of the rectifying circuit and the target output voltage of the rectifying circuit.
In this embodiment, the controller may obtain the output voltage of the rectifying circuit in real time, calculate a difference between the output voltage of the rectifying circuit and the target output voltage of the rectifying circuit, and use the difference as the voltage difference of the rectifying circuit. The target output voltage of the rectifier circuit is a target voltage on both sides of the dc bus, and the target voltage is a preset voltage, for example, 800V.
S402, outputting a first pulse width modulation signal based on the voltage difference value; the first pulse width modulation signal is used for controlling the on and off of each bridge arm of a rectifier bridge circuit in the rectifier circuit so as to control the output voltage of the rectifier circuit.
In this embodiment, the controller may determine a voltage adjustment value corresponding to the voltage difference based on the voltage difference, and output a first pulse width modulation signal to control on and off of each bridge arm of the rectifier bridge circuit in the rectifier circuit, so that the output voltage of the rectifier circuit is close to the target output voltage of the rectifier circuit.
In the voltage conversion method, a voltage difference between the output voltage of the rectifying circuit and the target output voltage of the rectifying circuit is obtained, and a first pulse width modulation signal is output based on the voltage difference; the first pulse width modulation signal is used for controlling the on and off of each bridge arm of a rectifier bridge circuit in the rectifier circuit so as to control the output voltage of the rectifier circuit. According to the method, the voltage difference between the output voltage of the rectifying circuit and the target output voltage of the rectifying circuit is calculated, a first pulse width modulation signal is output according to the voltage difference, and the output voltage of the rectifying circuit can be accurately adjusted according to the first pulse width modulation signal, so that the output voltage of the rectifying circuit is close to the target output voltage of the rectifying circuit.
On the basis of the above embodiment, in this embodiment, the "outputting the first pwm signal based on the voltage difference" in the above step S402 is specifically described, and as shown in fig. 16, the above step S402 further includes:
s501, determining a rectification voltage adjustment coefficient corresponding to the voltage difference of the rectification circuit based on the voltage difference of the rectification circuit.
The voltage adjustment coefficient refers to a voltage adjustment value of the output voltage in the rectifying circuit.
In this embodiment, after the controller obtains the voltage difference value of the rectifying circuit, the controller may determine the voltage adjustment value corresponding to the voltage difference value based on the voltage difference value. The voltage adjustment coefficient can adjust the output voltage of the rectifying circuit and reduce the voltage difference of the rectifying circuit.
S502, determining the duty ratio of the first pulse width modulation signal based on the current and the rectification voltage adjustment value of the rectification circuit, and outputting the first pulse width modulation signal.
FIG. 17 is a schematic diagram of a three-two transformation when L is acquired A 、L B And L C After the current and voltage values of (2), the current value includes the current I of the A phase a Current I of B phase b And C phase current I c The voltage value includes the voltage V of A phase a Voltage V of B phase b And voltage V of C phase c Converting the current value and the voltage value from three phases to two phases to obtain d-phase voltage V d Q-phase voltage V q D-phase current I d And q-phase current I q . FIG. 18 is a circuit diagram showing the control of the output voltage of the rectifier circuit, V bus For the output voltage of the rectifying circuit, i.e. the voltage across the rectifying-filter capacitor, V busref For the target output voltage of the rectifying circuit, according to V bus And V is equal to busref Can determine the voltage adjustment coefficient G corresponding to the voltage difference of the rectification circuit v The current I of the rectifying circuit is subjected to low-pass filter bus Filtering and based on the current I of the rectifying circuit after filtering bus Current of one phaseI d Determining a rectification current adjustment coefficient G i 。I qref Is the target output current of the rectifying circuit, based on I qref D-phase current I q Determining a rectification current adjustment coefficient G i Then the two-phase voltage value V is utilized d And V q Respectively regulating the coefficients G of the obtained rectifying currents i And (3) performing inner loop current adjustment, and converting the adjusted current from the dq coordinate system to the alpha beta coordinate system to obtain a space vector pulse width modulation signal (Space Vector Pulse Width Modulation, SVPWM), namely a first pulse width modulation signal.
In the voltage conversion method, the rectification voltage adjustment coefficient corresponding to the voltage difference of the rectification circuit is determined based on the voltage difference of the rectification circuit, the duty ratio of the first pulse width modulation signal is accurately determined based on the current difference of the rectification circuit and the rectification voltage adjustment value, and the first pulse width modulation signal is output.
On the basis of the above embodiment, this embodiment specifically describes "outputting the first pwm signal based on the voltage difference value" in the above step S302, and as shown in fig. 19, the above step S302 further includes:
s601, acquiring a voltage difference between the output voltage of the resonant conversion circuit and the target output voltage under the condition that the difference between the output voltage of the rectification circuit and the target output voltage is smaller than a preset voltage difference.
In this embodiment, only when the output voltage of the rectified voltage reaches the target output voltage of the rectifying circuit, the charging process of the rectifying filter capacitor is completed. At this time, the rectifying filter capacitor can be discharged to the output filter capacitor through the resonant conversion circuit. Therefore, when the controller determines that the difference between the output voltage of the rectifying circuit and the target output voltage is smaller than the preset voltage difference, the controller can acquire the output voltage of the resonant conversion circuit and calculate the voltage difference between the output voltage of the resonant conversion circuit and the target output voltage.
S602, outputting a second pulse width modulation signal according to the voltage difference value of the resonance conversion circuit and the output current of the rectification circuit; the second pulse width modulation signal is used for controlling the switching frequency of the frequency adjusting circuit in the resonant conversion circuit so as to control the output voltage of the resonant conversion circuit.
In this embodiment, the controller may determine a voltage adjustment value controlled by the outer ring of the voltage according to the voltage difference value of the resonant conversion circuit, determine a target output current of the rectifying circuit according to the voltage adjustment value and the voltage difference value, determine a current adjustment value controlled by the inner ring of the current based on a current difference value between the output current of the rectifying circuit and the target output current, output a second pwm signal based on the current adjustment value controlled by the inner ring and the current adjustment value controlled by the outer ring, and control a switching frequency of the frequency adjustment circuit in the resonant conversion circuit so as to minimize the voltage difference value of the resonant conversion circuit.
In the voltage conversion method, when the difference between the output voltage of the rectifying circuit and the target output voltage is smaller than a preset voltage difference, the voltage difference between the output voltage of the resonant conversion circuit and the target output voltage is obtained, and a second pulse width modulation signal is output according to the voltage difference of the resonant conversion circuit and the output current of the rectifying circuit; the second pulse width modulation signal is used for controlling the switching frequency of the frequency adjusting circuit in the resonant conversion circuit so as to control the output voltage of the resonant conversion circuit. The method can accurately determine the adjustment value of the output voltage based on the voltage difference between the output voltage of the resonant conversion circuit and the target output voltage, and can output a more accurate second pulse width modulation signal based on the output current of the rectification circuit.
On the basis of the above embodiment, this embodiment specifically describes "outputting the second pwm signal according to the voltage difference of the resonant conversion circuit and the output current of the rectifying circuit" in the above step S602, and as shown in fig. 20, the above step S602 further includes:
s701, based on the voltage difference value of the resonant conversion circuit, obtaining a voltage adjustment coefficient corresponding to the voltage difference value.
In this embodiment, after the controller obtains the voltage difference value of the resonant conversion circuit, the voltage adjustment value corresponding to the voltage difference value may be determined based on the voltage difference value. The voltage adjustment coefficient can adjust the output voltage of the resonant conversion circuit and reduce the voltage difference of the resonant conversion circuit.
S702, acquiring a current adjustment coefficient corresponding to the current difference value based on the current difference value of the rectifying circuit; the current difference value is the current difference value between the output current of the rectifying circuit and the target current; the target current is determined based on the voltage adjustment factor.
In this embodiment, after the controller obtains the output target circuit of the rectifying circuit, the current difference between the actual output current of the rectifying circuit and the target current is calculated.
S703, determining the frequency of the second pwm signal based on the voltage adjustment coefficient and the current adjustment coefficient, and outputting the second pwm signal.
The current adjustment coefficient refers to a current adjustment value of the output current of the rectifier circuit.
In this embodiment, after the controller obtains the current difference between the actual output current and the target current, the controller may determine the current adjustment value corresponding to the current difference based on the current difference. The current regulating value regulates the output current of the rectifying circuit, and reduces the current difference value of the rectifying circuit. After the controller obtains the voltage regulating value and the current regulating value, the frequency of the second pulse width modulation signal is determined according to the voltage regulating value and the current regulating value, and the output voltage of the resonant conversion circuit and the input current of the rectifying circuit are regulated through the second pulse width modulation signal, so that the output voltage of the resonant conversion circuit is closer to the target output voltage.
FIG. 21 is a circuit diagram showing the control of the output voltage of the resonant converter circuit, V 0 For the output voltage of the resonant conversion circuit, V 0ref For the target output voltage of the resonant conversion circuit, G v For the voltage adjustment coefficient corresponding to the voltage difference value, I bus G is the output current of the rectifying circuit i For the current adjustment coefficient corresponding to the current difference, the VCO is a voltage-controlled oscillator, and the second pwm signal may be output through the voltage-controlled oscillator.
In the voltage conversion method, a voltage adjustment coefficient corresponding to the voltage difference value is obtained based on the voltage difference value of the resonant conversion circuit; based on the current difference value of the rectifying circuit, acquiring a current adjustment coefficient corresponding to the current difference value; the current difference value is the current difference value between the output current of the rectifying circuit and the target current; the target current is determined according to the voltage adjustment coefficient; and determining the frequency of the second pulse width modulation signal based on the voltage adjustment coefficient and the current adjustment coefficient, and outputting the second pulse width modulation signal. According to the method, the outer loop control is performed through the voltage difference value, the output target current in the inner loop control process is determined, the inner loop control is performed according to the difference value between the output target current and the output current, and a more accurate second pulse width modulation signal can be obtained.
In one embodiment, the present application is described in detail with reference to a voltage conversion method, as shown in fig. 22, which includes:
s801, collecting current output by a rectifying circuit through a sampling circuit;
s802, acquiring a voltage difference value between the output voltage of the rectifying circuit and the target output voltage of the rectifying circuit;
s803, determining a rectification voltage adjustment coefficient corresponding to the voltage difference value of the rectification circuit based on the voltage difference value of the rectification circuit;
S804, determining the duty ratio of the first pulse width modulation signal based on the current and the rectification voltage adjustment value of the rectification circuit, and outputting the first pulse width modulation signal;
s805, acquiring a voltage difference between the output voltage of the resonant conversion circuit and the target output voltage under the condition that the difference between the output voltage of the rectification circuit and the target output voltage is smaller than a preset voltage difference;
s806, acquiring a voltage adjustment coefficient corresponding to the voltage difference value based on the voltage difference value of the resonant conversion circuit;
s807, acquiring a current adjustment coefficient corresponding to the current difference value based on the current difference value of the rectifying circuit;
s808, determining the frequency of the second pwm signal based on the voltage adjustment coefficient and the current adjustment coefficient, and outputting the second pwm signal.
It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a voltage conversion device for realizing the voltage conversion method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation of the embodiment of the voltage conversion device or devices provided below may be referred to the limitation of the voltage conversion method hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 23, there is provided a voltage conversion device including: an acquisition module 11 and a control module 12, wherein:
the acquisition module 11 is used for acquiring the current output by the rectifying circuit through the sampling circuit;
the control module 12 is used for controlling the output voltage of the resonant conversion circuit based on the output current of the rectifying circuit.
In one embodiment, the acquisition module includes: an acquisition unit and a determination unit, wherein:
the acquisition unit is used for acquiring sampling voltages and resistance values of two ends of a sampling resistor in the sampling circuit;
and the determining unit is used for taking the ratio of the sampling voltage to the resistance value of the resistor as the current output by the rectifying circuit.
In one embodiment, the control module includes a first control unit and a second control unit, where:
A first control unit for controlling an output voltage of the rectifying circuit based on an output current of the rectifying circuit;
and a second control unit for controlling the output voltage of the resonant conversion circuit based on the output current of the rectification circuit and the output voltage of the rectification circuit.
In one embodiment, the first control unit is further configured to obtain a voltage difference between an output voltage of the rectifying circuit and a target output voltage of the rectifying circuit; outputting a first pulse width modulation signal based on the voltage difference; the first pulse width modulation signal is used for controlling the on and off of each bridge arm of a rectifier bridge circuit in the rectifier circuit so as to control the output voltage of the rectifier circuit.
In one embodiment, the first control unit is further configured to determine a rectified voltage adjustment coefficient corresponding to the voltage difference of the rectifying circuit based on the voltage difference of the rectifying circuit;
and determining the duty ratio of the first pulse width modulation signal based on the current difference value and the rectification voltage adjustment value of the rectification circuit, and outputting the first pulse width modulation signal.
In one embodiment, the second control unit is further configured to obtain a voltage difference between the output voltage of the resonant conversion circuit and the target output voltage when the difference between the output voltage of the rectifying circuit and the target output voltage is smaller than a preset voltage difference; outputting a second pulse width modulation signal according to the voltage difference value of the resonant conversion circuit and the output current of the rectification circuit; the second pulse width modulation signal is used for controlling the switching frequency of the frequency adjusting circuit in the resonant conversion circuit so as to control the output voltage of the resonant conversion circuit.
In one embodiment, the second control unit is further configured to obtain a voltage adjustment coefficient corresponding to the voltage difference value based on the voltage difference value of the resonant conversion circuit; based on the current difference value of the rectifying circuit, acquiring a current adjustment coefficient corresponding to the current difference value; the current difference value is the current difference value between the output current of the rectifying circuit and the target current; the target current is determined according to the voltage adjustment coefficient; determining the frequency of the second PWM signal based on the voltage adjustment coefficient and the current adjustment coefficient, and outputting the second PWM signal
The various modules in the voltage conversion device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a controller, the internal structure of which may be as shown in fig. 24. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the controller of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used to store data during the voltage transformation. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a voltage conversion method.
It will be appreciated by those skilled in the art that the structure shown in FIG. 24 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, a computer device is provided, including a memory and a processor, where the memory stores a computer program, and the processor implements the content of the voltage conversion method in any of the embodiments described above when the computer program is executed.
In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor, implements the content of the voltage conversion method in any of the above embodiments.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the contents of the voltage conversion method in any of the above embodiments.
The user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or sufficiently authorized by each party.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (22)
1. A voltage conversion circuit, characterized in that the voltage conversion circuit comprises: the device comprises a rectifying circuit, a sampling circuit, a resonant conversion circuit and a controller; the sampling circuit is connected between the output end of the rectifying circuit and the input end of the resonance conversion circuit, and the rectifying circuit, the sampling circuit and the resonance conversion circuit are all connected with the controller;
The controller is used for controlling the output voltage of the resonance conversion circuit according to the output current of the rectification circuit acquired by the sampling circuit.
2. The voltage conversion circuit according to claim 1, wherein the sampling circuit includes a sampling resistor;
and the controller is used for determining the output current of the rectifying circuit according to the voltages at the two ends of the sampling resistor and the resistance value of the sampling resistor.
3. The voltage conversion circuit according to claim 1 or 2, wherein the resonant conversion circuit comprises a frequency adjustment circuit, an isolation transformer and a secondary synchronous rectification circuit, a first end of the frequency adjustment circuit is connected with the sampling circuit and an output end of the controller respectively, a second end of the frequency adjustment circuit is connected with a primary side of the isolation transformer, a secondary side of the isolation transformer is connected with an input end of the secondary synchronous rectification circuit, and an output end of the secondary synchronous rectification circuit is connected with an input end of the controller;
the controller is used for controlling the switching frequency of the frequency adjusting circuit and controlling the on and off of the secondary synchronous rectifying circuit according to the output current of the rectifying circuit and the output voltage of the secondary synchronous rectifying circuit which are acquired by the sampling circuit.
4. A voltage conversion circuit according to claim 3, wherein the frequency adjustment circuit comprises a primary side switch circuit and a resonant cavity circuit, a first end of the primary side switch circuit is connected with the sampling circuit, a second end of the primary side switch circuit is respectively connected with the output end of the controller and the first end of the resonant cavity circuit, and a second end of the resonant cavity circuit is connected with a primary side of the isolation transformer;
the controller is used for controlling the on-off time of the primary side switch circuit according to the output current of the rectifier circuit and the output voltage of the secondary side synchronous rectifier circuit acquired by the sampling circuit.
5. The voltage conversion circuit according to claim 4, wherein the primary side switching circuit comprises a first switching tube and a second switching tube, wherein a grid electrode of the first switching tube and a grid electrode of the second switching tube are connected with an output end of the controller, a drain electrode of the first switching tube and a source electrode of the second switching tube are connected with the sampling circuit, and a source electrode of the first switching tube and a drain electrode of the second switching tube are connected with the resonant cavity circuit.
6. The voltage conversion circuit according to claim 5, wherein the resonant cavity circuit includes a resonant inductor, a resonant capacitor, and a transformer excitation inductor, a first end of the resonant inductor is connected to a source of the first switching tube and a drain of the second switching tube, a second end of the resonant inductor is connected to the first end of the resonant capacitor, a second end of the resonant capacitor is connected to the first end of the transformer excitation inductor, a second end of the transformer excitation inductor is connected to a drain of the second switching tube, and the transformer excitation inductor is connected in parallel to a primary side of the isolation transformer.
7. The voltage conversion circuit according to claim 3, wherein the secondary synchronous rectification circuit comprises a third switching tube, a fourth switching tube and an output filter capacitor, wherein the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are connected with the output end of the controller, the source electrode of the third switching tube is connected with the first end of the secondary side of the isolation transformer circuit, the source electrode of the fourth switching tube is connected with the second end of the secondary side of the isolation transformer circuit, the drain electrode of the third switching tube is connected with the first end of the output filter capacitor, and the drain electrode of the fourth switching tube is connected with the second end of the output filter capacitor.
8. The voltage conversion circuit according to claim 1 or 2, wherein the rectifying circuit comprises a rectifying filter circuit and a rectifying bridge circuit, a first end of the rectifying filter circuit is connected with an alternating current power grid, a second end of the rectifying filter circuit is connected with a first end of the rectifying bridge circuit and an input end of the controller, and a second end of the rectifying bridge circuit is connected with the sampling circuit and the input end of the controller;
the controller is used for controlling the on and off of each power switching tube in the rectifier bridge circuit according to the output current and the output voltage of the rectifier filter circuit and the output current of the rectifier circuit collected by the sampling circuit.
9. The voltage conversion circuit according to claim 8, wherein the rectifying and filtering circuit comprises three-phase rectifying and filtering circuits, each phase of rectifying and filtering circuit comprises a grid-connected side inductor, a filtering capacitor and an inversion side inductor, a first end of the grid-connected side inductor is connected with the ac power grid, a second end of the grid-connected side inductor is connected with the first end of the filtering capacitor and the first end of the inversion side inductor, and a second end of the inversion side inductor is connected with the rectifying bridge circuit; the second end of the filter capacitor is grounded.
10. The voltage conversion circuit according to claim 9, wherein the rectifier bridge circuit comprises a three-phase rectifier bridge circuit and a rectifier filter capacitor, each phase of rectifier bridge circuit comprises a first power switch tube and a second power switch tube, bases of the first power switch tube and the second power switch tube are all connected with the output end of the controller, an emitter of the first power switch tube and a collector of the second power switch tube are all connected with the second end of the rectifier filter circuit, a collector of the first power switch tube is connected with the first end of the rectifier filter capacitor, and the second power switch tube and the emitter are connected with the second end of the rectifier filter capacitor.
11. A power supply device, characterized in that it comprises a voltage conversion circuit according to any one of claims 1 to 10.
12. A method of voltage conversion, the method comprising:
collecting current output by a rectifying circuit through a sampling circuit;
and controlling the output voltage of the resonant conversion circuit based on the output current of the rectifying circuit.
13. The method of claim 12, wherein the collecting, by the sampling circuit, the current output by the rectifying circuit comprises:
Acquiring sampling voltages and resistance values of two ends of a sampling resistor in the sampling circuit;
and taking the ratio of the sampling voltage to the resistance value of the resistor as the current output by the rectifying circuit.
14. The method according to claim 12 or 13, wherein controlling the output voltage of the resonant conversion circuit based on the output current of the rectifying circuit comprises:
controlling an output voltage of the rectifying circuit based on an output current of the rectifying circuit;
and controlling the output voltage of the resonant conversion circuit based on the output current of the rectification circuit and the output voltage of the rectification circuit.
15. The method of claim 14, wherein controlling the output voltage of the rectifying circuit based on the output current of the rectifying circuit comprises:
acquiring a voltage difference between the output voltage of the rectifying circuit and a target output voltage of the rectifying circuit;
outputting a first pulse width modulation signal based on the voltage difference; the first pulse width modulation signal is used for controlling the on and off of each bridge arm of a rectifier bridge circuit in the rectifier circuit so as to control the output voltage of the rectifier circuit.
16. The method of claim 15, wherein outputting a first pulse width modulated signal based on the voltage difference comprises:
determining a rectification voltage adjustment coefficient corresponding to the voltage difference value of the rectification circuit based on the voltage difference value of the rectification circuit;
and determining the duty ratio of the first pulse width modulation signal based on the current of the rectifying circuit and the rectifying voltage adjustment value, and outputting the first pulse width modulation signal.
17. The method of claim 14, wherein controlling the output voltage of the resonant conversion circuit based on the output current of the rectifying circuit and the output voltage of the rectifying circuit comprises:
acquiring a voltage difference value between the output voltage of the resonant conversion circuit and the target output voltage under the condition that the difference value between the output voltage of the rectification circuit and the target output voltage is smaller than a preset voltage difference value;
outputting a second pulse width modulation signal according to the voltage difference value of the resonance conversion circuit and the output current of the rectification circuit; the second pulse width modulation signal is used for controlling the switching frequency of the frequency adjusting circuit in the resonance converting circuit so as to control the output voltage of the resonance converting circuit.
18. The method of claim 17, wherein outputting a second pwm signal based on the voltage difference of the resonant conversion circuit and the output current of the rectifying circuit comprises:
acquiring a voltage adjustment coefficient corresponding to the voltage difference value based on the voltage difference value of the resonant conversion circuit;
based on the current difference value of the rectifying circuit, acquiring a current adjustment coefficient corresponding to the current difference value; the current difference value is the current difference value between the output current of the rectifying circuit and the target current; the target current is determined according to the voltage adjustment coefficient;
and determining the frequency of the second pulse width modulation signal based on the voltage adjustment coefficient and the current adjustment coefficient, and outputting the second pulse width modulation signal.
19. A voltage conversion device, the device comprising:
the acquisition module is used for acquiring the current output by the rectifying circuit through the sampling circuit;
and the control module is used for controlling the output voltage of the resonant conversion circuit based on the output current of the rectifying circuit.
20. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 12 to 18 when the computer program is executed.
21. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 12 to 18.
22. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method of any of claims 12 to 18.
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| CN115483747A (en) * | 2022-10-12 | 2022-12-16 | 徐州金沙江半导体有限公司 | Multi-mode gallium nitride-based bidirectional vehicle-mounted charger |
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