CN116566230A - Multichannel wireless power transmission power equalization system and method - Google Patents
Multichannel wireless power transmission power equalization system and method Download PDFInfo
- Publication number
- CN116566230A CN116566230A CN202310385134.9A CN202310385134A CN116566230A CN 116566230 A CN116566230 A CN 116566230A CN 202310385134 A CN202310385134 A CN 202310385134A CN 116566230 A CN116566230 A CN 116566230A
- Authority
- CN
- China
- Prior art keywords
- control channel
- channel
- slave control
- voltage
- inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012546 transfer Methods 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000001965 increasing effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005288 electromagnetic effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
-
- 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
- H02M7/145—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 thyratron or thyristor type requiring extinguishing means
- H02M7/155—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/17—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only arranged for operation in parallel
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a multichannel wireless power transmission power balancing system and a multichannel wireless power transmission power balancing method, wherein the system comprises multichannel wireless power transmission structures, each channel wireless power transmission structure comprises an inverter, a transmission coil and a rectifying module, wherein the output end of the rectifying module is connected with a load, the inverter and the rectifying module of each channel are respectively arranged at the input end and the output end of the multichannel wireless power transmission structure in series and in parallel, any channel in the multichannel is a master control channel, other channels are slave control channels, the master control channels are provided with master control units, each slave control channel is provided with a slave control unit, the master control unit is used for controlling the load voltage to be stable at a set value, and the slave control unit is used for controlling the input voltage balance between the slave control channel and the master control channel where the slave control unit is positioned. The invention can realize load voltage stabilization and input voltage balance among multiple channels, thereby being beneficial to improving the running stability of the system and prolonging the service life of the system.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a multichannel wireless power transmission power equalization system and method.
Background
The wireless power transmission technology is a novel power transmission mode for realizing power transmission from a power supply to a load without electric contact through electromagnetic effect or energy exchange effect, has the advantages of safety, reliability and the like compared with the traditional wire power transmission mode, and is widely applied to electric automobiles, intelligent home and other industrial applications. In order to meet the ultra-high power transmission conditions of wireless charging trains and the like, the enhancement of the transmission capacity of a wireless power transmission system becomes a problem to be solved urgently.
However, because of the limitation of rated voltage/current of the single-channel wireless power transmission component, the power transmission capability is limited, and therefore, a multi-channel wireless power transmission topology needs to be adopted so as to be capable of meeting the energy transmission under the high input voltage. However, for a multi-channel wireless power transmission system, the parameter difference between the channels can cause the transmission power of different channels to be inconsistent, thereby affecting the running stability and the service life of the system.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a multi-channel wireless power transmission power balancing system, so as to achieve load voltage stabilization and input voltage balancing between multiple channels, thereby improving the balance of the transmission power of different channels, and further helping to improve the running stability and service life of the system.
A second object of the present invention is to provide a power equalization method for multi-channel wireless power transmission.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a multi-channel wireless power transfer equalization system, comprising:
the multi-channel wireless power transmission structure comprises an inverter, a transmission coil and a rectifying module, wherein the output end of the rectifying module is connected with a load, the inverter and the rectifying module of each channel are respectively connected in series and in parallel to be arranged at the input end and the output end of the multi-channel wireless power transmission structure, any channel in the multi-channel is a master control channel, other channels are slave control channels, the master control channel is provided with a master control unit, each slave control channel is provided with a slave control unit, the master control unit is used for controlling the load voltage to be stabilized at a set value, and the slave control unit is used for controlling the input voltage balance between the slave control channel and the master control channel where the slave control unit is located.
Optionally, a PID controller is built in the master control unit and each slave control unit.
Optionally, the multichannel wireless power transmission power equalization system further includes: the first voltage detection unit is used for detecting the voltages of the input ends of the master control channel and each slave control channel and sending the detected voltages of the input ends of the master control channel and the detected voltages of the input ends of the slave control channels to the slave control units of the corresponding slave control channels.
Optionally, the multichannel wireless power transmission power equalization system further includes: the second voltage detection unit is used for detecting the load voltage and sending the detected load voltage to the main control unit.
Optionally, the main control unit is specifically configured to perform a difference operation on the load voltage and the set voltage, and input the difference operation to an internal main control channel PID controller, where the main control channel PID controller outputs a duty cycle of the main control channel inverter, so as to adjust a driving signal of the main control channel inverter according to the duty cycle of the main control channel inverter, thereby implementing stable control of the load voltage.
Optionally, the multichannel wireless power transmission power equalization system further includes: and the data transmission module is used for transmitting the duty ratio data of the master control channel inverter to each slave control unit.
Optionally, the slave control unit is specifically configured to input a difference value between a desired input voltage ratio 1 and an input end voltage of the master control channel and a voltage ratio of an input end of the slave control channel to the internal slave control channel PID controller, so that the slave control channel PID controller outputs a corresponding duty ratio of the slave control channel inverter and a duty ratio of the master control channel inverter, and calculates a duty ratio of the corresponding slave control channel inverter according to the ratio and the received duty ratio of the master control channel inverter, so as to conveniently adjust a driving signal of the corresponding slave control channel inverter according to the duty ratio of the slave control channel inverter, thereby realizing input voltage equalization between the corresponding slave control channel and the master control channel.
Optionally, the data transmission module adopts a wired communication transmission mode to perform data transmission.
Optionally, the wired communication transmission mode is an RS485 communication mode.
In order to achieve the above object, a second aspect of the present invention provides a multi-channel wireless power transmission power equalization method, which is applied to the multi-channel wireless power transmission power equalization system, and includes:
step S1: any one channel in the multiple channels is selected as a master control channel, and other channels are selected as slave control channels;
step S2: a main control unit in a main control channel obtains load voltage, calculates the difference between the load voltage and a set voltage, inputs the difference into an internal main control channel PID controller, outputs the duty ratio of a main control channel inverter, and adjusts a driving signal of the main control channel inverter according to the duty ratio of the main control channel inverter so as to realize stable control of the load voltage;
step S3: the slave control unit in the slave control channel acquires the voltage of the input end of the master control channel and the voltage of the input end of the slave control channel of the slave control unit, and acquires the duty ratio of the master control channel inverter;
step S4: the slave control unit inputs the difference value between the expected input voltage ratio 1 and the voltage of the input end of the master control channel and the voltage ratio of the input end of the slave control channel to the internal slave control channel PID controller so that the slave control channel PID controller outputs the corresponding ratio of the duty ratio of the slave control channel inverter to the duty ratio of the master control channel inverter, the duty ratio of the corresponding slave control channel inverter is calculated according to the ratio and the duty ratio of the master control channel inverter, and the driving signal of the corresponding slave control channel inverter is regulated according to the duty ratio of the slave control channel inverter so as to realize the input voltage balance between the corresponding slave control channel and the master control channel.
The invention has at least the following technical effects:
the multichannel wireless power transmission power balancing system selects any one channel in the multichannel wireless power transmission power balancing system as a master control channel, takes other channels as slave control channels, then a master control unit in the master control channel calculates the difference value between the load voltage and the set voltage, and inputs the difference value into an internal master control channel PID controller, and the master control channel PID controller outputs the duty ratio of a master control channel inverter and adjusts the driving signal of the master control channel inverter according to the duty ratio of the master control channel inverter, so that the stable control of the load voltage can be realized; in addition, the slave control unit in the slave control channel inputs the difference value between the expected input voltage ratio 1 and the input end voltage of the master control channel and the voltage ratio of the input end of the slave control channel to the internal slave control channel PID controller, the slave control channel PID controller outputs the corresponding duty ratio of the slave control channel inverter and the duty ratio of the master control channel inverter, the duty ratio of the corresponding slave control channel inverter is calculated according to the ratio and the duty ratio of the master control channel inverter, and the driving signal of the corresponding slave control channel inverter is regulated according to the duty ratio of the slave control channel inverter, so that the input voltage balance between the corresponding slave control channel and the master control channel can be realized, the serious heating problem caused by the fact that one or more inverters are distributed to most of power can be avoided, and the service life of the whole system can be prolonged.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic diagram of a multi-channel wireless power transmission structure according to an embodiment of the present invention.
Fig. 2 is a control block diagram of a three-channel wireless power transmission system according to an embodiment of the present invention.
Fig. 3 is a flowchart of a multi-channel wireless power transfer power balancing method according to an embodiment of the present invention.
Detailed Description
The present embodiment is described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A multi-channel wireless power transfer power equalization system and method of the present embodiment are described below with reference to the accompanying drawings.
As mentioned in the background, the limitation of rated voltage/current of the single-channel wireless power transmission component can result in limited power transmission capability, so that the multi-channel wireless power transmission topology needs to be adopted to meet the requirement of energy transmission under high input voltage. In order to maintain a higher dc voltage and thereby increase the transmission power of the wireless power transmission system, the embodiment first proposes a multi-channel wireless power transmission system based on an input-series-output-parallel topology structure. On the primary side, a plurality of inverters are connected in series with an input voltage, each inverter driving an independent wireless transmission channel; on the secondary side, rectifiers of the various channels are output in parallel to integrate the power from the various channels. For a multi-channel wireless power transmission system, the parameter difference among the channels can cause inconsistent transmission power of different channels, and the running stability and the service life of the system are affected. Therefore, the embodiment provides a multichannel wireless power transmission power balancing system based on a multichannel wireless power transmission system with an input-series-output-parallel topological structure, which adopts a master-slave control strategy to realize power balancing among channels under the operation of the multichannel wireless power transmission system, so that the safety and stability of the system under high-power operation are ensured.
Fig. 1 is a schematic diagram of a multi-channel wireless power transmission structure according to an embodiment of the present invention. The multi-channel wireless power transmission power balancing system comprises the multi-channel wireless power transmission structure shown in fig. 1, such as channels H1, H2 to Hn, each channel wireless power transmission structure comprises an inverter (such as inverter N1), transmission coils (such as coils L11 and L12) and a rectifying module (such as rectifier M1), wherein an output end of the rectifying module is connected with a load R, and voltages at two ends of the load R are load voltages V 0 The inverter and the rectifying module of each channel are respectively arranged at the input end and the output end of the multi-channel wireless power transmission structure in series and in parallel, wherein the input end of the multi-channel wireless power transmission structure is connected with a direct current power supply with direct current voltage of V, and the input voltage of the nth channel is V inn The input end of the nth channel is also connected in parallel with a capacitor C n In addition, the transmission coils of the primary side and the secondary side are also connected in series with a compensation capacitor, such as the compensation capacitor C on the primary side and the secondary side of the nth channel n1 And C n2 And is connected with a resistor r n1 And r n2 。
In this embodiment, any channel (the first channel is selected without any loss of generality), i.e. the channel H1, may be selected as a master channel, and the other channels are all slave channels, where the master channel is provided with a master control unit, each slave channel is provided with a slave control unit, the master control unit is used for controlling the load voltage to be stabilized at a set value, and the slave control unit is used for controlling the input voltage balance between the slave channel where the slave control unit is located and the master control channel.
It should be noted that, the wireless power transmission component composed of the inverter, the transmission coil and the rectifying module in this embodiment may be used to perform energy transmission from the input end to the output end and adjust the duty ratio of the driving signal of the inverter in cooperation with the output voltage stabilization strategy and the power equalization method, so as to achieve the target control.
Further, the multi-channel wireless power transmission power equalization system further comprises a first voltage detection unit connected with the input ends of the master control channel and each slave control channel, and used for detecting the voltages of the input ends of the master control channel and each slave control channel and sending the detected voltages of the input ends of the master control channel and the detected voltages of the input ends of the slave control channels to the slave control units of the corresponding slave control channels through the data transmission module. The data transmission module is also used for transmitting the duty ratio data of the master control channel inverter to each slave control unit.
The multichannel wireless power transmission power balancing system further comprises a second voltage detection unit, wherein the second voltage detection unit is used for detecting load voltage and sending the detected load voltage to the main control unit.
In this embodiment, assuming that the voltage range of the load terminal is 0-1500V (volts), the voltage of the load terminal varying in the range of 0-1500V may be divided by a resistor of 299 kilohms and 1 kilohms to obtain a voltage ranging in 0-5V, and then an operational amplifier such as an OPA171 chip is used to construct a voltage retainer, so that the voltage of the output terminal is maintained at 0-5V.
Furthermore, the master control unit and the slave control unit can be selected as STM32F3 type serial chips, and because an ADC (analog-to-digital converter) module is arranged in the STM32F3 type serial chips and the acceptable voltage range is between 0 and 5V, the voltage of 0 to 5V of the output end of the voltage retainer in the load voltage detection circuit where the second voltage detection unit is positioned can be directly connected to the pin of the corresponding ADC of the STM32F3 chip, and the voltage amplitude is multiplied by 300 times after discrete sampling of the master control unit, so that the voltage at the two ends of a real load can be obtained. And then, the set load voltage value is differenced from the measured value, the difference value is input into an internal main control channel PID controller (proportional integral derivative controller), the main control channel PID controller outputs the duty ratio of the main control channel inverter, and the driving signal of the main control channel inverter is regulated according to the duty ratio of the main control channel inverter, so that the stable control of the load voltage is realized.
In order to ensure the data transmission rate, the data transmission module can select an RS485 (serial port communication) wired transmission mode to transmit the load voltage, the input end voltage of each channel and the duty ratio data of the main control channel inverter.
As an example, when the duty cycle data transmission of the master control channel inverter is performed, a data transmission module may be disposed between the master control channel and the slave control channel, that is, a data transmitting unit is disposed at the master control channel end, and a data receiving unit is disposed at the slave control channel end, where data transmission is performed between the two through an RS485 wired communication transmission mode.
As another example, when the input voltage is transmitted, for example, a data transmitting unit and a data receiving unit may be respectively disposed at two ends of the first voltage detecting unit and the slave control channel, where the first voltage detecting unit transmits the voltages of the master control channel and the corresponding slave control channel input end to the data receiving unit of the slave control channel through the data transmitting unit, and after receiving the data from the data receiving unit of the slave control channel, the data receiving unit sends the data to the slave control unit to perform data processing.
Further, the design of the internal slave channel PID controller can be described.
Taking a wireless power transmission system with n channels as an example, assume that the equivalent impedance of the ith channel is Z i The dc supply voltage is V. Then for the ith channel the input voltage isWherein V is i For the input voltage of the ith channel, |Z i I is the modulus of the equivalent impedance of the ith channel, Σ is the sum function, and n is the total channel number. Thus, as long as the modes controlling the impedance of the individual channels are equal, Z 1 ＝Z 2 ＝…＝Z n The input voltages of the channels can be equalized, wherein Z n Is the equivalent impedance of the nth channel.
For each channel, its input power is equal to the output power, i.e. P i ＝V i I i ＝V o I o ＝P o Wherein P is i For the I channel input power, I i For the input current of the i channel, V o For the output terminal voltage of the I channel, I o For the current at the output of the i channel, P o The output power of the i channel. For the multichannel wireless power transmission system based on the input-series-output-parallel topology structure, the input ends are connected in series, so that the input currents of all channels are equal, i.e i1 ＝I i2 ＝…＝I in ，I in Is the input current of the nth channel. The output ends are connected in parallel, so that the output voltages of all channels are equal, namely V o1 ＝V o2 ＝…＝V on ，V on Is the output voltage of the nth channel. Thus, if input voltage equalization is ensured, the output current is naturally equalized as well.
Further, assume that the duty ratio of the driving signal of the inverter of the ith channel is D c The input terminal voltage is V i The output signal of the inverter isT is the period of the driving signal, T is the time, and the output signal is subjected to Fourier transformation to obtain:
where sin is a sine function, pi is a circumference ratio, and ω is an angular frequency of the output signal.
For a wireless power transmission system, the energy transmission part is mainly the fundamental component, and the higher harmonic wave output by the inverter is removed, so that the approximate inverter output voltage can be obtained as follows:
its effective value V o I.e. the output voltage of the i-th channel is:
for an inverter, neglecting its energy loss, if the inverter is followed by a pure resistive load, its input power is equal to the active power of the output power, and the output reactive power is equal to 0, namely:
P i ＝V i I i ＝V o I o ＝P o (4)
the inverter of the system is connected with a wireless power transmission system, so that in order to ensure that the system is generally an inductive load under the condition of ZVS (soft switching), the input power of the inverter is equal to the active power part of the output power, namely:
P i ＝V i I i ＝V o I o cosθ＝P o cosθ (5)
where θ is the impedance angle and cos is the cosine function.
Therefore, the relationship between the input current and the output current of the inverter can be obtained as:
from the above-described voltage-current relationship, a relationship between input-output impedance with respect to the inverter can be obtained:
wherein Z is o Is the output impedance of the corresponding i-th channel.
For each channel, the input impedance seen from the inverter is the equivalent impedance of the entire channel, so that the mode uniformity controlling the impedance of each channel is the mode uniformity controlling the input impedance of the inverter. While the output impedance and impedance angle of the inverter are determined by the device parameters of the system and will not change once the device parameters are determined. According to the above formula, the slave channel PID controller can adjust the modulus of the equivalent input impedance of the channel by changing the duty cycle of the inverter drive signal to adjust the transmission power.
Taking a two-channel system as an example, the output impedance of an inverter with two channels is respectively Z o1 And Z o2 Impedance angles are respectively theta 1 And theta 2 . The input impedance of the inverter is Z respectively i1 And Z i2 The duty ratio of the driving signals is D respectively C1 And D C2 Then from equation (3), equation (5) and ohm's law:
the preparation according to the above formula can be obtained:
wherein V is i1 For the input voltage of the first channel, V i2 Is the input voltage of the second channel, |Z o1 I is a modulus of the output impedance of the first channel inverter, Z o2 I is a modulus of the output impedance of the second channel inverter, Z i1 I is the modulus of the input impedance of the first channel inverter, Z i2 I is the modulus of the second channel inverter input impedance,in part by the parameters of the device,in part, by the inverter drive signal duty cycle.
If V is needed i1 ＝V i2 Only need |Z i1 |＝|Z i2 I, i.e.:
sin 2 (D C2 π)cosθ 2 |Z o1 |＝sin 2 (D C1 π)cosθ 1 |Z o2 | (10)
and (3) further finishing to obtain:
namely:
wherein arcsin is an arcsin function, that is, the input voltages of the two channels can be balanced by adjusting the duty ratios of the two channels to satisfy the formula (12). When 0 is<D C1 <At 0.5 sin (D C2 Pi) about D C2 Monotonically increasing, and sin (D C2 π)>0; and also hasWith respect to sin (D C2 Pi) monotonically increasing, i.e.>Regarding D C2 Monotonically increasing. Thus, when D C2 When determining, there is and only one D C1 So that it satisfies the above formula.
Further, for the first channel there are:
wherein V is 1 And V is equal to i1 The same definition, representing the input voltage of the first channel, is given by:
when D is C2 When determining, V 1 Regarding D C1 Monotonically decreasing, and about D C2 Monotonically increasing, as in D C1 When determining, V 2 Regarding D C2 Monotonically decreasing, and about D C1 Monotonically increasing. I.e. the input voltage of a channel can be reduced by increasing the duty cycle of the inverter drive signal of that channel and vice versa.
For example, when the input voltage of the first channel is greater thanThe input voltage of the second channel is less than +.>When the duty ratio of the inverter driving signal of the first channel is increased, the voltage of the first channel is decreased, and the voltage of the second channel is increased until the following formula is satisfied:
at this time, the input voltages of the two channels are identical.
When the load voltage is greater than the set point, the duty cycle of the second channel is reduced, and in order to ensure the input voltage balance, the duty cycle of the first channel is also reduced, and the duty cycle of both channels is reduced so that the load voltage is reduced until the load voltage reaches the set point. The above process is repeated until the transmission power of all channels tends to be consistent, and the voltage of the load end is stable.
Therefore, the slave control unit of the slave control channel can input the difference value between the expected input voltage ratio 1 and the input end voltage of the master control channel and the voltage ratio of the input end of the slave control channel to the internal slave control channel PID controller so that the slave control channel PID controller outputs the corresponding duty ratio of the slave control channel inverter and the duty ratio of the master control channel inverter, and then calculates the duty ratio of the corresponding slave control channel inverter according to the ratio and the duty ratio of the master control channel inverter, thereby being convenient for adjusting the driving signals of the corresponding slave control channel inverter according to the duty ratio of the slave control channel inverter and realizing the input voltage balance between the corresponding slave control channel and the master control channel.
Specifically, a program can be written in the STM32F3 chip, namely the slave control unit, the acquired input voltage of the main control channel is divided by the input voltage of the main control channel, then the difference between 1 and the ratio is carried out to obtain the error between the input voltage ratio and 1, the error is input into the slave control channel PID controller for calculation, the output control quantity, namely the ratio of the channel duty ratio to the main control channel duty ratio is output, and the duty ratio of the channel is adjusted according to the ratio, so that the balanced control of the input voltage is realized, and the constant output voltage of the output load end and the power balance among all channels are realized.
Fig. 2 is a control block diagram of a three-channel wireless power transmission system according to an embodiment of the present invention. As shown in fig. 2, channel 1 is a master control channel, and the load voltage V o And a set load voltage value V oset The difference value of the (a) is input into a main control unit, and a main control channel PID controller, namely PID#1 outputs the duty ratio d of a main control channel inverter 1 . Channel 2 is a slave channel which receives the duty ratio d of the master channel inverter sent by the master channel, i.e. channel 1 1 . Further, the slave control unit of the channel 2 receives the voltage of the input end of the master control channelAnd the voltage at the input of the channel +.>Then the quotient is made and is differenced with 1, and the difference is input to a slave control channel PID controller, namely PID#2, and the PID#2 outputs the ratio of the duty ratio of the self channel inverter to the duty ratio of the master control channel inverter>Then the slave control unit controls the duty ratio d of the channel inverter according to the ratio 1 Calculating to obtain the duty ratio d of the self-channel inverter 2 And according to the duty ratio d of the self-channel inverter 2 And the input voltage balance between the self channel and the main control channel is realized. Channel 3 is the same as channel 2 in principle and will not be described again here.
Fig. 3 is a flowchart of a multi-channel wireless power transfer power balancing method according to an embodiment of the present invention. As shown in fig. 3, the method includes:
step S1: any one channel in the multiple channels is selected as a master control channel, and other channels are selected as slave control channels.
Step S2: the main control unit in the main control channel obtains the load voltage, calculates the difference between the load voltage and the set voltage, inputs the difference into the internal main control channel PID controller, outputs the duty ratio of the main control channel inverter, and adjusts the driving signal of the main control channel inverter according to the duty ratio of the main control channel inverter so as to realize the stable control of the load voltage.
Step S3: the slave control unit in the slave control channel acquires the voltage of the input end of the master control channel and the voltage of the input end of the slave control channel, and acquires the duty ratio of the master control channel inverter.
Step S4: the slave control unit inputs the difference value between the expected input voltage ratio 1 and the voltage of the input end of the master control channel and the voltage ratio of the input end of the slave control channel to the internal slave control channel PID controller so that the slave control channel PID controller outputs the corresponding duty ratio of the slave control channel inverter and the duty ratio of the master control channel inverter, calculates the duty ratio of the corresponding slave control channel inverter according to the ratio and the duty ratio of the master control channel inverter, and adjusts the driving signal of the corresponding slave control channel inverter according to the duty ratio of the slave control channel inverter so as to realize the input voltage balance between the corresponding slave control channel and the master control channel.
It should be noted that, the multi-channel wireless power transmission power equalization method in this embodiment is the same as the specific implementation manner of the multi-channel wireless power transmission power equalization system described above, and in order to avoid redundancy, the description is omitted here.
In summary, the multi-channel wireless power transmission power equalization system selects any channel in the multi-channel wireless power transmission power equalization system as a master control channel, takes other channels as slave control channels, then a master control unit in the master control channel calculates the difference value between the load voltage and the set voltage, and inputs the difference value to an internal master control channel PID controller, the master control channel PID controller outputs the duty ratio of a master control channel inverter, and adjusts the driving signal of the master control channel inverter according to the duty ratio of the master control channel inverter, so that the stable control of the load voltage can be realized; in addition, the slave control unit in the slave control channel inputs the difference value between the expected input voltage ratio 1 and the input end voltage of the master control channel and the voltage ratio of the input end of the slave control channel to the internal slave control channel PID controller, the slave control channel PID controller outputs the corresponding duty ratio of the slave control channel inverter and the duty ratio of the master control channel inverter, the duty ratio of the corresponding slave control channel inverter is calculated according to the ratio and the duty ratio of the master control channel inverter, and the driving signal of the corresponding slave control channel inverter is regulated according to the duty ratio of the slave control channel inverter, so that the input voltage balance between the corresponding slave control channel and the master control channel can be realized, the serious heating problem caused by the fact that one or more inverters are distributed to most of power can be avoided, and the service life of the whole system can be prolonged.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (10)
1. The utility model provides a multichannel wireless power transmission power equalizing system, its characterized in that includes multichannel wireless power transmission structure, and every passageway wireless power transmission structure includes dc-to-ac converter, transmission coil and rectifier module, rectifier module's output connection load, the dc-to-ac converter and the rectifier module of each passageway establish ties respectively and parallelly connected the input and the output of multichannel wireless power transmission structure, and wherein, arbitrary passageway in the multichannel is the master control passageway, and other passageways are the slave control passageway, the master control passageway is provided with the master control unit, each slave control passageway is provided with the slave control unit, the master control unit is used for controlling load voltage and stabilizes at the setting value, the slave control unit is used for controlling self from the slave control passageway with input voltage between the master control passageway is balanced.
2. The multi-channel wireless power transfer equalization system of claim 1, wherein said master unit and each of said slave units are internally configured with PID controllers.
3. The multi-channel wireless power transfer power equalization system of claim 2, further comprising:
the first voltage detection unit is used for detecting the voltages of the input ends of the master control channel and each slave control channel and sending the detected voltages of the input ends of the master control channel and the detected voltages of the input ends of the slave control channels to the slave control units of the corresponding slave control channels.
4. The multi-channel wireless power transfer power equalization system of claim 3, further comprising:
the second voltage detection unit is used for detecting the load voltage and sending the detected load voltage to the main control unit.
5. The multi-channel wireless power transmission equalization system of claim 4, wherein said main control unit is specifically configured to perform a difference operation between said load voltage and a set voltage, and input the difference operation to an internal main control channel PID controller, said main control channel PID controller outputting a duty cycle of a main control channel inverter, so as to adjust a driving signal of the main control channel inverter according to the duty cycle of the main control channel inverter, thereby realizing a stable control of the load voltage.
6. The multi-channel wireless power transfer power equalization system of claim 5, further comprising:
and the data transmission module is used for transmitting the duty ratio data of the master control channel inverter to each slave control unit.
7. The multi-channel wireless power transmission equalization system of claim 6, wherein said slave control unit is specifically configured to input a difference between a desired input voltage ratio 1 and a voltage ratio of an input terminal voltage of a master control channel and a voltage ratio of an input terminal of a slave control channel itself to an internal slave control channel PID controller, so that the slave control channel PID controller outputs a ratio of a duty cycle of a corresponding slave control channel inverter to a duty cycle of the master control channel inverter, and calculate a duty cycle of the corresponding slave control channel inverter according to the ratio and the received duty cycle of the master control channel inverter, so as to adjust a driving signal of the corresponding slave control channel inverter according to the duty cycle of the slave control channel inverter, so as to realize equalization of the input voltage between the corresponding slave control channel and the master control channel.
8. The multi-channel wireless power transfer power equalization system of claim 6, wherein said data transfer module is configured to transfer data using a wired communication transmission scheme.
9. The multi-channel wireless power transfer power equalization system of claim 8, wherein said wired communication mode is an RS485 communication mode.
10. A multi-channel wireless power transfer equalization method applied to a multi-channel wireless power transfer equalization system as claimed in any one of claims 1-9, comprising:
step S1: any one channel in the multiple channels is selected as a master control channel, and other channels are selected as slave control channels;
step S2: a main control unit in a main control channel obtains load voltage, calculates the difference between the load voltage and a set voltage, inputs the difference into an internal main control channel PID controller, outputs the duty ratio of a main control channel inverter, and adjusts a driving signal of the main control channel inverter according to the duty ratio of the main control channel inverter so as to realize stable control of the load voltage;
step S3: the slave control unit in the slave control channel acquires the voltage of the input end of the master control channel and the voltage of the input end of the slave control channel of the slave control unit, and acquires the duty ratio of the master control channel inverter;
step S4: the slave control unit inputs the difference value between the expected input voltage ratio 1 and the voltage of the input end of the master control channel and the voltage ratio of the input end of the slave control channel to the internal slave control channel PID controller so that the slave control channel PID controller outputs the corresponding ratio of the duty ratio of the slave control channel inverter to the duty ratio of the master control channel inverter, the duty ratio of the corresponding slave control channel inverter is calculated according to the ratio and the duty ratio of the master control channel inverter, and the driving signal of the corresponding slave control channel inverter is regulated according to the duty ratio of the slave control channel inverter so as to realize the input voltage balance between the corresponding slave control channel and the master control channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310385134.9A CN116566230A (en) | 2023-04-06 | 2023-04-06 | Multichannel wireless power transmission power equalization system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310385134.9A CN116566230A (en) | 2023-04-06 | 2023-04-06 | Multichannel wireless power transmission power equalization system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116566230A true CN116566230A (en) | 2023-08-08 |
Family
ID=87487026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310385134.9A Pending CN116566230A (en) | 2023-04-06 | 2023-04-06 | Multichannel wireless power transmission power equalization system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116566230A (en) |
-
2023
- 2023-04-06 CN CN202310385134.9A patent/CN116566230A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Dai et al. | Maximum efficiency tracking for wireless power transfer systems with dynamic coupling coefficient estimation | |
| US9438125B2 (en) | Power conversion apparatus and power conversion method with phase control | |
| US20160105120A1 (en) | Power conversion apparatus | |
| CN109245542A (en) | A kind of symmetrical power converter circuit topological structure and its control method | |
| US20150295504A1 (en) | Electric power conversion apparatus and method of controlling the same | |
| US9727125B2 (en) | Power supply system with a plurality of power supply circuits and control method of the same | |
| US20140347890A1 (en) | Power conversion apparatus and power conversion method | |
| CN112366677B (en) | Multi-phase-shift model prediction control method for three-port power electronic transformer | |
| CN103283120A (en) | System for wireless power transmission | |
| CN112217294B (en) | Non-communication constant current control method applied to bidirectional wireless power transmission circuit | |
| CN111799897B (en) | Method for controlling power converter circuit | |
| CN104377839A (en) | Multi-loop control method for magnetic resonance coupling wireless power transmission system | |
| CN109687604B (en) | One-to-many wireless power transmission system suitable for ordered loads and control method thereof | |
| CN104660053A (en) | Power conversion apparatus and power correction method | |
| US9425698B2 (en) | Power conversion apparatus and method | |
| WO2021006274A1 (en) | Grid interconnection device and server | |
| CN111587526A (en) | DC-DC converter device | |
| US20140347892A1 (en) | Power conversion apparatus and power conversion method | |
| EP1063758B1 (en) | Power supply device | |
| CN116566230A (en) | Multichannel wireless power transmission power equalization system and method | |
| CN112953033B (en) | Wireless power transmission device based on non-contact hysteresis regulation and control method | |
| US20190341809A1 (en) | Non-contact power supply device | |
| CN113054758B (en) | Multi-channel wireless power transmission system for realizing power self-balancing | |
| CN111355307A (en) | BD-WPT system power coordination control method based on PI controller optimization | |
| US9515564B2 (en) | Power conversion apparatus and power conversion method based on a control constant and a feedback value based on current flow |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |