CN108696156B - Control method and device for power converter - Google Patents
Control method and device for power converter Download PDFInfo
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- CN108696156B CN108696156B CN201810851728.3A CN201810851728A CN108696156B CN 108696156 B CN108696156 B CN 108696156B CN 201810851728 A CN201810851728 A CN 201810851728A CN 108696156 B CN108696156 B CN 108696156B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 57
- 238000005070 sampling Methods 0.000 claims description 91
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000002955 isolation Methods 0.000 claims description 12
- 230000010363 phase shift Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control method and a device of a power converter, wherein the control method comprises a main circuit, the main circuit consists of an alternating current/direct current conversion circuit and a direct current/direct current conversion circuit, the direct current/direct current conversion circuit regulates output voltage through the on and off of a switching tube, and in a controller of the direct current/direct current conversion circuit, a bus voltage ring and a first arithmetic unit are added in a voltage loop of the controller, so that the power converter still can keep certain power output when the controller is switched to the bus voltage ring for control; in the DC/DC conversion circuit controller, a bus voltage ring and a first arithmetic unit are added in a voltage loop, so that when the controller is switched to the bus voltage ring for control, the power supply converter can still keep certain power output.
Description
Technical Field
The present invention relates to the field of power electronics, and in particular, to a method and apparatus for controlling a power converter.
Background
In the communication power supply AC/DC module, the main circuit is generally composed of a front-stage PFC circuit and a rear-stage isolated DC/DC circuit, and bus capacitors are connected in parallel between the two stages of circuits. The bus capacitor generally adopts a large-capacity electrolytic capacitor due to the requirement of the module holding time, but the total capacity of the bus capacitor is limited due to the limitation of the module volume and the cost. The voltage ring of the PFC bus is low in bandwidth and poor in dynamic performance, when a load is subjected to large dynamic jump, the voltage of the bus capacitor can be fluctuated in a large range, the overvoltage and undervoltage protection of the bus voltage is easy to cause, and in order to process the input voltage jump and the output load jump, a voltage outer ring is usually added with measures like nonlinear control and the like when the load jumps, so that the overvoltage and undervoltage protection of the PFC bus voltage can be guaranteed. However, when the load of the rear stage is further increased and exceeds the requirement of the maximum load capacity under the input voltage, the bus voltage is further pulled down until the bus under-voltage PFC is shut down, so that the whole module is not operated.
When the load is a battery, the module on the system is usually set to have the maximum output capacity to charge the battery, and if the input voltage is abnormally reduced and the load capacity of the module is reduced at this time, the load still charges the battery according to the previous maximum current limiting point, and the module is pulled to be shut down by the load. Typically, the battery load is expected to reduce the output current of the load to continue charging, and after the input voltage returns to normal, the module can continue charging according to the maximum current limit point.
Disclosure of Invention
The invention aims to provide a control method and a device for a power converter, which can effectively solve the defects in the prior art.
The invention is realized by the following technical scheme: the control method of a power converter, it includes a main circuit, this main circuit is made up of alternating current/direct current converting circuit and direct current/direct current converting circuit, the said direct current/direct current converting circuit regulates the output voltage through opening and closing of the switching tube, in the said direct current/direct current converting circuit controller, through increasing a bus voltage ring and first arithmetic unit in its voltage loop, make its controller switch over to the said bus voltage ring control, the power converter can still keep certain power output;
the switching tube in the direct current/direct current conversion circuit is controlled by a driving signal through a driving circuit to obtain the driving signal, and the method specifically comprises the following steps of:
Generating a control value V1 after the bus voltage set value and the bus voltage sampling value pass through a second arithmetic unit, wherein the control value V1 generates a control value V2 through a first negative feedback compensation regulator; the output voltage set value and the output voltage sampling value pass through a second arithmetic unit to generate a control value V3, the control value V3 passes through a second negative feedback compensation regulator to generate a control value V4, the control value V2 and the control value V4 pass through a first arithmetic unit to generate a control value V5, and the control value V5 passes through a signal generator to generate the driving signal.
As a preferable technical scheme, the operation of the first arithmetic unit is a small operation, and the output value of the first arithmetic unit is the minimum value of two input values of the first arithmetic unit;
The operation of the second arithmetic unit is a difference operation, and the output value of the second arithmetic unit is the difference value of two input values of the second arithmetic unit;
the bus voltage set value is smaller than the minimum bus voltage value of the power converter in steady-state operation.
As a preferable technical scheme, the control value V5 and the output current sampling value generate a control value V6 through a second arithmetic unit, the control value V6 generates a control value V7 through a third negative feedback compensation regulator, and the control value V7 generates the driving signal through a signal generator.
As a preferable technical scheme, the output voltage sampling value and the output current sampling value generate a control value V8 through a third arithmetic unit, and the control value V5 and the control value V8 generate the control value V6 through a second arithmetic unit.
The operation of the third operator is multiplication operation, that is, the output value of the third operator is the product value of the two input values of the third operator.
As an optimal technical scheme, a switching tube in the direct current/direct current conversion circuit can adopt control modes such as variable frequency modulation, pulse width modulation, phase shift control and the like, and the corresponding driving signals are a switching frequency signal, a pulse duty ratio signal and phase shift angle signals with different switching tube duty ratios respectively.
The power converter device comprises an alternating current/direct current conversion circuit, a bus capacitor, a direct current/direct current conversion circuit, a first sampling circuit, a second sampling circuit, a driving circuit and a controller circuit, wherein the input end of the power converter device is connected with the input end of the alternating current/direct current conversion circuit, the output end of the alternating current/direct current conversion circuit is connected with the input end of the direct current/direct current conversion circuit in parallel through the bus capacitor, the output end of the direct current/direct current conversion circuit is connected with the output end of the power converter device, a bus capacitor voltage generates a bus voltage sampling value through the first sampling circuit, the output voltage obtains an output voltage sampling value through the second sampling circuit, the bus voltage sampling value and the output voltage sampling value are sent to the controller circuit, and a closed loop control generated driving signal is controlled to control the on and off of a switching tube in the direct current/direct current converter through the driving circuit.
As a preferable technical scheme, the output current passes through the third sampling circuit to obtain an output current sampling value, in the controller circuit, the control value V5 and the output current sampling value pass through the second arithmetic unit to generate a control value V6, the control value V6 passes through the third negative feedback compensation regulator to generate a control value V7, the control value V7 passes through the signal generator to generate a driving signal, and the driving signal controls the on/off of a switching tube in the direct current/direct current conversion circuit through the driving circuit.
In a preferred embodiment, in the controller circuit, the output voltage sampling value and the output current sampling value generate a control value V8 through a third arithmetic unit, and the control value V5 and the control value V8 generate the control value V6 through a second arithmetic unit.
The operation of the third operator is multiplication operation, that is, the output value of the third operator is the product value of the two input values of the third operator.
As a preferable technical scheme, the controller is a digital signal processor.
As an preferable technical scheme, when the dc/dc conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the secondary level, the primary current generates a primary current sampling value through the third sampling circuit, and in the controller circuit, the primary current sampling value is converted into the output current sampling value.
As an preferable technical scheme, when the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the secondary side level, the first sampling circuit is an isolation sampling circuit; when the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the primary side ground level, the second sampling circuit and the third sampling circuit are isolation sampling circuits, and the driving circuit is an isolation driving circuit.
The beneficial effects of the invention are as follows: 1) When the load demand is greater than the maximum output capacity of the module under the condition of the input voltage at the moment, the module voltage outer loop is switched to the newly-increased bus voltage closed-loop control, so that the bus voltage stably works at the other steady-state bus voltage value, at the moment, the bus voltage is lower than the bus voltage minimum value during steady-state work, and is between the bus voltage minimum value and the bus under-voltage value during steady-state work, the fact that the rear-stage DC/DC circuit can still keep certain power output can be ensured, and the output working range of the power converter is expanded.
2) When the load changes dynamically, nonlinear operation of the front PFC part can be reduced, and the rear control loop can be switched smoothly between the two loops according to the actual load carrying capacity of the bus, so that the voltage stability of the bus is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a first schematic illustration of the method of the present invention;
FIG. 2 is a second schematic illustration of the method of the present invention;
FIG. 3 is a third schematic representation of the method of the present invention;
FIG. 4 is a circuit diagram of a first embodiment of the apparatus of the method of the present invention;
FIG. 5 is a circuit diagram of a second embodiment of the apparatus of the present invention;
Fig. 6 is a circuit diagram of a third embodiment of the apparatus of the method of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1:
As shown in fig. 1-4, the power converter is composed of a controller 1, an ac/dc conversion circuit 2, a bus capacitor 3, a dc/dc conversion circuit 4, a first sampling circuit, a second sampling circuit, a driving circuit, and the like, wherein the controller 1 is a Digital Signal Processor (DSP).
The input end of the power converter device is connected with the input end of the alternating current/direct current conversion circuit 2, the output end of the alternating current/direct current conversion circuit is connected with the input end of the direct current/direct current conversion circuit 4 in parallel through a bus capacitor 3, the output end of the direct current/direct current conversion circuit 4 is connected with the output end of the power converter device, bus capacitor voltage generates a bus voltage sampling value through the first sampling circuit, output voltage obtains an output voltage sampling value through the second sampling circuit, the bus voltage sampling value and the output voltage sampling value are sent to an AD port of the controller 1, and the controller 1 performs closed-loop control to generate a driving signal to control the on and off of a switching tube in the direct current/direct current converter 4 through a driving circuit.
In the circuit of the controller 1, a bus voltage set value and a bus voltage sampling value generate a control value V1 after passing through a second arithmetic unit 12, and the control value V1 generates a control value V2 after passing through a first negative feedback compensation regulator 13; the output voltage set value and the output voltage sampling value pass through a second arithmetic unit to generate a control value V3, the control value V3 passes through a second negative feedback compensation regulator 14 to generate a control value V4, the control value V2 and the control value V4 pass through a first arithmetic unit 11 to generate a control value V5, the control value V5 passes through a signal generator 15 to generate a driving signal, and the driving signal is sent to the driving circuit to control the on and off of a switching tube in the direct current/direct current conversion circuit.
The operation of the first operator 11 is a small operation, that is, the output value of the first operator 11 is the minimum value of the two input values of the first operator 11.
The second arithmetic unit 12 performs a difference operation, that is, the output value of the second arithmetic unit 12 is the difference between the two input values of the second arithmetic unit 12.
And the given value of the bus voltage is smaller than the minimum value of the bus voltage when the power converter works in a steady state.
Example 2:
Fig. 5 shows a circuit diagram of a first embodiment of a power converter control method and apparatus employing the present invention. The power converter consists of a controller 1, an alternating current/direct current conversion circuit 2, a bus capacitor 3, a direct current/direct current conversion circuit 4, a first sampling circuit, a second sampling circuit, a third sampling circuit, a driving circuit and the like, wherein the controller 1 is a Digital Signal Processor (DSP).
The input end of the power converter device is connected with the input end of the alternating current/direct current conversion circuit 2, the output end of the alternating current/direct current conversion circuit is connected with the input end of the direct current/direct current conversion circuit 4 in parallel through a bus capacitor 3, the output end of the direct current/direct current conversion circuit 4 is connected with the output end of the power converter device, bus capacitor voltage passes through the first sampling circuit to generate bus voltage sampling values, output voltage passes through the second sampling circuit to obtain output voltage sampling values, the bus voltage sampling values and the output voltage sampling values are sent to an AD port of the controller 1, and the controller 1 performs closed-loop control to generate a driving signal to control the on and off of a switching tube in the direct current/direct current converter 4 through a driving circuit.
In the circuit of the controller 1, a bus voltage set value and a bus voltage sampling value generate a control value V1 after passing through a second arithmetic unit 12, and the control value V1 generates a control value V2 after passing through a first negative feedback compensation regulator 13; the output voltage set value and the output voltage sampling value pass through a second arithmetic unit to generate a control value V3, the control value V3 passes through a second negative feedback compensation regulator 14 to generate a control value V4, the control value V2 and the control value V4 pass through a first arithmetic unit 11 to generate a control value V5, the control value V5 and the output current sampling value pass through a second arithmetic unit 12 to generate a control value V6, the control value V6 passes through a third negative feedback compensation regulator 16 to generate a control value V7, the control value V7 passes through a signal generator 17 to generate a driving signal, and the driving signal controls the on and off of a switching tube in the direct current/direct current conversion circuit through the driving circuit.
The operation of the first operator 11 is a small operation, that is, the output value of the first operator 11 is the minimum value of the two input values of the first operator 11.
The second arithmetic unit 12 performs a difference operation, that is, the output value of the second arithmetic unit 12 is the difference between the two input values of the second arithmetic unit 12.
And the given value of the bus voltage is smaller than the minimum value of the bus voltage when the power converter works in a steady state.
Example 3:
fig. 6 shows a circuit diagram of a first embodiment of a power converter control method and apparatus employing the present invention. The power converter consists of a controller 1, an alternating current/direct current conversion circuit 2, a bus capacitor 3, a direct current/direct current conversion circuit 4, a first sampling circuit, a second sampling circuit, a third sampling circuit, a driving circuit and the like, wherein the controller 1 is a Digital Signal Processor (DSP).
The input end of the power converter device is connected with the input end of the alternating current/direct current conversion circuit 2, the output end of the alternating current/direct current conversion circuit is connected with the input end of the direct current/direct current conversion circuit 4 in parallel through a bus capacitor 3, the output end of the direct current/direct current conversion circuit 4 is connected with the output end of the power converter device, bus capacitor voltage generates a bus voltage sampling value through the first sampling circuit, the output voltage obtains an output voltage sampling value through the second sampling circuit, the bus voltage sampling value and the output voltage sampling value are sent to an AD port of the controller 1, and the controller 1 performs closed-loop control to generate a driving signal to control the on and off of a switching tube in the direct current/direct current converter 4 through a driving circuit.
In the circuit of the controller 1, a bus voltage set value and a bus voltage sampling value generate a control value V1 after passing through a second arithmetic unit 12, and the control value V1 generates a control value V2 after passing through a first negative feedback compensation regulator 13; the output voltage set value and the output voltage sampling value pass through a second arithmetic unit to generate a control value V3, the control value V3 passes through a second negative feedback compensation regulator 14 to generate a control value V4, the control value V2 and the control value V4 pass through a first arithmetic unit 11 to generate a control value V5, the output voltage sampling value and the output current sampling value pass through a third arithmetic unit 17 to generate a control value V8, the control value V5 and the control value V8 pass through the second arithmetic unit to generate a control value V6, the control value V6 passes through a third negative feedback compensation regulator 16 to generate a control value V7, the control value V7 passes through a signal generator 15 to generate a driving signal, and the driving signal controls the on and off of a switching tube in the direct current/direct current conversion circuit through the driving circuit.
The operation of the first operator 11 is a small operation, that is, the output value of the first operator 11 is the minimum value of the two input values of the first operator 11.
The second arithmetic unit 12 performs a difference operation, that is, the output value of the second arithmetic unit 12 is the difference between the two input values of the second arithmetic unit 12.
The operation of the third operator is multiplication operation, namely, the output value of the third operator is the product value of two input values of the third operator.
And the given value of the bus voltage is smaller than the minimum value of the bus voltage when the power converter works in a steady state.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any changes or substitutions that do not undergo the inventive effort should be construed as falling within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (2)
1. The control method of a power converter, it includes a main circuit, this main circuit is made up of alternating current/direct current converting circuit and direct current/direct current converting circuit, the said direct current/direct current converting circuit regulates the output voltage through opening and closing of the switching tube, characterized by that: in the DC/DC conversion circuit controller, a bus voltage ring and a first arithmetic unit are added in a voltage loop, so that the power supply converter can still keep certain power output when the controller is switched to the bus voltage ring for control;
the switching tube in the direct current/direct current conversion circuit is controlled by a driving signal through a driving circuit to obtain the driving signal, and the method specifically comprises the following steps of:
Generating a control value V1 after the bus voltage set value and the bus voltage sampling value pass through a second arithmetic unit, wherein the control value V1 generates a control value V2 through a first negative feedback compensation regulator; the output voltage set value and the output voltage sampling value pass through a second arithmetic unit to generate a control value V3, the control value V3 passes through a second negative feedback compensation regulator to generate a control value V4, the control value V2 and the control value V4 pass through a first arithmetic unit to generate a control value V5, and the control value V5 passes through a signal generator to generate the driving signal;
The operation of the first arithmetic unit is a small operation, and the output value of the first arithmetic unit is the minimum value of two input values of the first arithmetic unit;
The operation of the second arithmetic unit is a difference operation, and the output value of the second arithmetic unit is the difference value of two input values of the second arithmetic unit;
the bus voltage set value is smaller than the bus voltage minimum value when the power converter works in a steady state;
The control value V5 and the output current sampling value generate a control value V6 through a second arithmetic unit, the control value V6 generates a control value V7 through a third negative feedback compensation regulator, and the control value V7 generates the driving signal through a signal generator;
The output voltage sampling value and the output current sampling value generate a control value V8 through a third arithmetic unit, and the control value V5 and the control value V8 generate a control value V6 through a second arithmetic unit;
The operation of the third operator is multiplication operation, namely, the output value of the third operator is the product value of two input values of the third operator;
the switching tube in the direct current/direct current conversion circuit can adopt control modes such as variable frequency modulation, pulse width modulation, phase shift control and the like, and the corresponding driving signals are switching frequency signals, pulse duty ratio signals and phase shift angle signals of different switching tube duty ratios respectively.
2. A power converter apparatus, characterized by: the power supply circuit comprises an alternating current/direct current conversion circuit, a bus capacitor, a direct current/direct current conversion circuit, a first sampling circuit, a second sampling circuit, a driving circuit and a controller circuit, wherein the input end of a power supply converter device is connected with the input end of the alternating current/direct current conversion circuit, the output end of the alternating current/direct current conversion circuit is connected with the input end of the direct current/direct current conversion circuit in parallel through the bus capacitor, the output end of the direct current/direct current conversion circuit is connected with the output end of the power supply converter device, a bus capacitor voltage is subjected to the first sampling circuit to generate a bus voltage sampling value, the output voltage is subjected to the second sampling circuit to obtain an output voltage sampling value, the bus voltage sampling value and the output voltage sampling value are sent to the controller circuit, and a closed loop control generation driving signal is subjected to the driving circuit to control the on and off of a switching tube in the direct current/direct current converter;
Generating a control value V1 after the bus voltage set value and the bus voltage sampling value pass through a second arithmetic unit, wherein the control value V1 generates a control value V2 through a first negative feedback compensation regulator; the output voltage set value and the output voltage sampling value pass through a second arithmetic unit to generate a control value V3, the control value V3 passes through a second negative feedback compensation regulator to generate a control value V4, the control value V2 and the control value V4 pass through a first arithmetic unit to generate a control value V5, and the control value V5 passes through a signal generator to generate the driving signal;
the output current passes through a third sampling circuit to obtain an output current sampling value, a control value V6 is generated by the control value V5 and the output current sampling value through a second arithmetic unit in the controller circuit, a control value V7 is generated by the control value V6 through a third negative feedback compensation regulator, a driving signal is generated by the control value V7 through a signal generator, and the driving signal controls the on and off of a switching tube in the direct current/direct current conversion circuit through the driving circuit; in the controller circuit, the output voltage sampling value and the output current sampling value generate a control value V8 through a third arithmetic unit, and the control value V5 and the control value V8 generate a control value V6 through a second arithmetic unit;
The operation of the third operator is multiplication operation, namely, the output value of the third operator is the product value of two input values of the third operator; the controller is a digital signal processor;
when the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the secondary side level, a primary side current is used for generating a primary side current sampling value through the third sampling circuit, and the primary side current sampling value is converted into the output current sampling value in the controller circuit;
When the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the secondary side ground level, the first sampling circuit is an isolation sampling circuit; when the direct current/direct current conversion circuit is a conversion circuit with transformer isolation and the ground level of the controller is the primary side ground level, the second sampling circuit and the third sampling circuit are isolation sampling circuits, and the driving circuit is an isolation driving circuit.
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| CN111697813B (en) * | 2019-03-13 | 2022-03-04 | 青岛海尔智能技术研发有限公司 | Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium |
| CN113098343B (en) * | 2021-04-15 | 2023-11-21 | 深圳市正浩创新科技股份有限公司 | Method, device and system for controlling output power of generator and electronic equipment |
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| CN107069803A (en) * | 2017-03-21 | 2017-08-18 | 特变电工西安电气科技有限公司 | The low-voltage crossing controller and method of a kind of two-stage type inverter |
| CN107124105A (en) * | 2017-05-05 | 2017-09-01 | 南京理工大学 | Improve isolated form three-level PFC converter PF control system and method |
| CN209948984U (en) * | 2018-07-27 | 2020-01-14 | 深圳英飞源技术有限公司 | Power converter device |
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