CN110912280A - Wireless power transmission system based on bidirectional voltage doubling circuit - Google Patents
Wireless power transmission system based on bidirectional voltage doubling circuit Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
Abstract
The invention provides a wireless power transmission system based on a bidirectional voltage doubling circuit, which belongs to the technical field of power electronics and wireless energy transmission and comprises the following components: the inversion module converts the direct current input voltage into alternating current input voltage; the primary side energy transmitting module receives an alternating current input voltage and generates an alternating electromagnetic field; the secondary side energy receiving module generates a same-frequency alternating current input voltage with the same frequency as the alternating current input voltage by using an alternating electromagnetic field; the bidirectional voltage-multiplying boosting rectifying module converts the same-frequency alternating-current input voltage into direct-current output voltage; the control module adjusts the direct current output voltage by adjusting the phase shift angle of the trigger signal of the inversion module. The invention transfers electric energy through electromagnetic induction between the primary coil and the secondary coil, and adds the bidirectional voltage doubling circuit at the rear stage of the secondary coil, thereby improving the direct current output voltage under the remote low-coupling state, completing rectification, making up the defect that the output voltage is difficult to improve under the remote low-coupling condition, and enlarging the application range of wireless electric energy transmission.
Description
Technical Field
The invention relates to the technical field of power electronics and wireless energy transmission, in particular to a wireless electric energy transmission system based on a bidirectional voltage doubling circuit, which can realize long-distance low-coupling transmission of electric energy.
Background
Compared with the traditional wired electric energy transmission, the wireless electric energy transmission technology has higher safety and stronger convenience. According to different principles, wireless power transmission technologies can be broadly divided into three types: the first is far-field radiation type, which has the highest working frequency and long transmission distance, but has low transmission efficiency and serious electromagnetic pollution; the second is an electromagnetic resonance type, which has high working frequency and long transmission distance, but the research is insufficient and the technology is not mature; the third is electromagnetic induction coupling type, which has large transmission power and high transmission efficiency although the transmission distance is short, and the technology is the most mature.
In high-power and short-distance occasions, the electromagnetic induction coupling type electric energy transmission technology is widely applied. The conventional electromagnetic induction coupling type power transmission technology generally works as follows: the direct current is inverted into high-frequency alternating current, the primary coil and the secondary coil carry out energy transfer through electromagnetic induction, and a rectification circuit is connected to the rear stage of the secondary coil to obtain the direct current. However, in some high-power situations, such as the fields of electric vehicles and trams, due to the limitation of installation space and the requirement of electromagnetic protection, the distance between the primary coil and the secondary coil has to be far away, the coupling coefficient between the coils is low, and the voltage at two ends of the secondary coil is difficult to increase in a low coupling state, so that the index requirement cannot be met.
In order to improve the output voltage, the prior art considers that a boosting transformer is connected to the rear stage of the secondary coil, but the electric energy loss is caused, and the system efficiency is reduced. Or a C-W voltage doubling circuit is added at the rear stage of the secondary side coil, but the traditional C-W voltage doubling circuit has large voltage drop, large voltage ripple and poor load carrying capacity of output voltage, and is not suitable for being applied to the fields with frequent load change and higher requirement on the precision of the output voltage. The bidirectional voltage doubling circuit is an improved C-W voltage doubling circuit, has the advantages of small voltage drop, small voltage ripple and the like, and can be applied to the secondary coil post-stage voltage boosting.
Disclosure of Invention
The invention aims to provide a wireless power transmission system based on a bidirectional voltage doubling circuit, which improves output voltage, completes rectification and enlarges the application range of wireless power transmission, so as to solve at least one technical problem in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a wireless power transmission system based on a bidirectional voltage doubling circuit, which comprises:
the inverter module is used for converting the direct current input voltage into alternating current input voltage;
the wireless power transmission module is used for transmitting the alternating current input voltage to the bidirectional voltage-multiplying boosting rectification module; the wireless power transmission module comprises a primary side energy transmitting module and a secondary side energy receiving module; the primary side energy transmitting module is used for receiving the alternating current input voltage and generating an alternating electromagnetic field; the secondary side energy receiving module is used for generating a same-frequency alternating current input voltage with the same frequency as the alternating current input voltage by using the alternating electromagnetic field;
the bidirectional voltage-multiplying boosting rectifying module is used for converting the same-frequency alternating-current input voltage into direct-current output voltage;
and the control module is used for adjusting the direct current output voltage by adjusting the phase shift angle of the trigger signal of the inversion module.
Preferably, the positive electrode and the negative electrode of the direct current input are connected with the input end of the inversion module; the output end of the inversion module is connected with the input end of the wireless electric energy transmission module; the output end of the wireless power transmission module is connected with the input end of the bidirectional voltage-multiplying boosting rectification module; the output of the bidirectional voltage-multiplying boosting rectifying module is the final direct-current output voltage.
Preferably, the inverter module is a single-phase full-bridge inverter circuit, and includes two parallel-connected bridge arms, and each bridge arm has two fully-controlled switching devices.
Preferably, the primary energy transmitting module comprises a primary coil, and the secondary energy receiving module comprises a secondary coil; the primary coil is connected with a primary compensation capacitor in series, and the secondary coil is connected with a secondary compensation capacitor in series.
Preferably, the primary coil is a multi-turn rectangular coil, and the capacitance value of the primary compensation capacitor is obtained by calculation according to the resonance frequency and the self-inductance of the primary coil; the secondary coil is a multi-turn rectangular coil, and the capacitance value of the secondary compensation capacitor is obtained through calculation according to the resonance frequency and the self-inductance of the secondary coil.
Preferably, when the system realizes complete compensation, namely the primary coil and the secondary coil both resonate at the angular frequency omega of the inverter, the effective value of the fundamental wave of the output voltage of the inverter module is set as UinInductance of primary winding is LpPrimary side compensation capacitance of CpInductance of secondary winding is LsThe secondary side compensation capacitance is CsThe mutual inductance between the primary coil and the secondary coil is M, and the parasitic resistance of the primary coil is RpThe parasitic resistance of the secondary side coil inductance is RsThe equivalent resistance of the secondary output side is Req(ii) a The total impedance of the primary energy emitting module is ZpThe total impedance of the secondary energy emitting module is ZsThe impedance after the secondary side energy transmitting module is converted into the primary side energy transmitting module is Zr(ii) a Then:
according to kirchhoff's law, the following are obtained:
the real and imaginary parts of the reflected impedance are respectively:
the circuit parameters of the primary side energy emission module and the primary side energy emission module respectively satisfy:
the capacitance of the primary compensation capacitor and the capacitance of the secondary compensation capacitor are respectively
Preferably, the bidirectional voltage-multiplying boost rectifying module is composed of a bidirectional voltage-multiplying circuit, and the bidirectional voltage-multiplying circuit simultaneously boosts and rectifies the alternating current received by the secondary side energy receiving module to obtain the direct current output voltage.
Preferably, the bidirectional voltage-multiplying boost rectifying module comprises two C-W voltage-multiplying circuits with a phase difference of 180 degrees, which are connected in series.
Preferably, the control module comprises a primary current sampling circuit, an output voltage sampling circuit, a control circuit and a drive circuit;
the primary side current sampling circuit is used for collecting the primary side current of the primary side energy emission module, and the primary side current is converted and conditioned and then is transmitted to the control circuit;
the output voltage sampling circuit is used for collecting the direct current output voltage signal;
the control circuit is used for sending a control signal according to the primary side current converted and conditioned by the primary side current sampling circuit and sending the control signal to the driving circuit;
and the driving circuit is used for controlling the frequency and the amplitude of the alternating current input voltage output by the inversion module according to the control signal.
Preferably, the primary current sampling circuit samples the primary current in each resonant period, the sampling frequency in each period is n, and the sampling frequency is based on the maximum value I of the n sampled datap-maxCalculating the peak value I of the primary current by the sum minimum valuep-pp；
Control circuit pair Ip-ppAnd a primary current reference value Ip-refComparing; wherein the content of the first and second substances,
if Ip-pp＜Ip-refIf the current value of the primary coil is larger than the preset value, the control circuit sends a signal for reducing the trigger pulse phase shift angle to the driving circuit, and the driving circuit changes the turn-on time and the turn-off time of a fully-controlled switching device in the inverter module according to the signal, reduces the trigger pulse phase shift angle and increases the current value of the primary coil;
if Ip-pp＝Ip-refIf the current value of the primary coil is not changed, the control circuit sends a signal for keeping the trigger pulse phase shift angle unchanged to the driving circuit, the driving circuit enables the turn-on time and the turn-off time of the fully-controlled switching device in the inverter module to be kept unchanged according to the signal, the trigger pulse phase shift angle is kept unchanged, and the current value of the primary coil is kept unchanged;
if Ip-max＞Ip-pp＞Ip-refIf the current value of the primary coil is larger than the preset value, the control circuit sends a signal for increasing the trigger pulse phase shift angle to the driving circuit, and the driving circuit changes the turn-on time and the turn-off time of a fully-controlled switching device in the inverter module according to the signal, so that the trigger pulse phase shift angle is increased and the current value of the primary coil is reduced;
if Ip-pp＞Ip-maxAnd the control circuit sends a signal for closing the trigger pulse to the drive circuit, and the drive circuit closes the fully-controlled switching device of the inverter module according to the signal, blocks the trigger pulse and performs overcurrent protection.
The invention has the beneficial effects that: electric energy is transmitted through electromagnetic induction between the original secondary side coil, and aiming at the defect that the output voltage is lower in a remote low-coupling state, a bidirectional voltage doubling circuit is added at the rear stage of the secondary side coil to improve the output voltage and complete rectification, so that the defect that the output voltage is difficult to improve under the remote low-coupling condition is overcome, and the application range of wireless electric energy transmission is enlarged.
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
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a wireless power transmission system based on a bidirectional voltage doubling circuit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of electromagnetic coupling between a primary side energy transmitting module and a secondary side energy receiving module according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram illustrating that the secondary energy transmitting module is equivalent to the primary energy receiving module according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of a working mode when a voltage at an input terminal of the bidirectional voltage doubling circuit is positive and negative.
Fig. 5 is a schematic diagram of an operation mode of the bidirectional voltage doubling circuit according to the embodiment of the invention, wherein the voltage at the input end of the bidirectional voltage doubling circuit is positive and negative and positive.
Fig. 6 is a schematic diagram of phase shift control of the control module to the inverter module according to the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by way of the drawings are illustrative only and are not to be construed as limiting the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the description of this patent, it is noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "coupled," and "disposed" are intended to be inclusive and mean, for example, that they may be fixedly coupled or disposed, or that they may be removably coupled or disposed, or that they may be integrally coupled or disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
For the purpose of facilitating an understanding of the present invention, the present invention will be further explained by way of specific embodiments with reference to the accompanying drawings, which are not intended to limit the present invention.
It should be understood by those skilled in the art that the drawings are merely schematic representations of embodiments and that the elements shown in the drawings are not necessarily required to practice the invention.
Example 1
The embodiment 1 of the invention provides a long-distance low-coupling wireless power transmission system based on a bidirectional voltage doubling circuit, which comprises: the wireless power transmission system comprises an inversion module, a wireless power transmission module, a bidirectional voltage-multiplying boosting rectification module and a control module.
The inversion module is used for converting the direct current into high-frequency alternating current;
the wireless electric energy transmission module comprises a primary side energy transmitting module and a secondary side energy receiving module, the primary side energy transmitting module receives the high-frequency alternating current and generates an alternating electromagnetic field, and the secondary side energy receiving module induces alternating current with the same frequency through electromagnetic induction to convert magnetic field energy into electric energy, so that wireless electric energy transmission is realized.
The bidirectional voltage-multiplying boost rectifying module is composed of a bidirectional voltage-multiplying circuit, the bidirectional voltage-multiplying circuit is formed by serially connecting two C-W voltage-multiplying circuits with a phase difference of 180 degrees, the voltage ripple and the voltage drop of the output voltage of the bidirectional voltage-multiplying boost rectifying module are smaller than those of the C-W voltage-multiplying circuit, and the bidirectional voltage-multiplying boost rectifying module is higher in load carrying capacity. The bidirectional voltage doubling circuit simultaneously performs boosting and rectifying functions on the alternating current received by the secondary side energy receiving module to obtain output voltage.
The control module comprises a primary side current sampling circuit, an output voltage sampling circuit, a control circuit and a driving circuit, wherein the primary side current and the output voltage are sampled, analyzed and compared, and a control signal is sent to the driving circuit, and the driving circuit amplifies the control signal and then drives a switching device to control the switching on and off of the switching device.
The inverter module is a single-phase full-bridge inverter circuit and comprises two parallel bridge arms, two fully-controlled switching devices are connected to each bridge arm in series, and the driving circuit is used for transmitting corresponding trigger signals to control the on and off of the switching devices, so that the frequency and amplitude of the output high-frequency alternating current are controlled.
The wireless electric energy transmission module comprises a primary side energy transmitting module and a secondary side energy receiving module. Due to the large air gap between the primary and secondary side coils, a large leakage inductance exists in the coupling coil, the phase difference between voltage and current is increased due to the existence of the leakage inductance, the voltage and current stress borne by the power device is increased, and the leakage inductance must be compensated.
In embodiment 1 of the present invention, the wireless power transmission module adopts a series-series (SS) compensation mode, that is, a compensation capacitor is respectively connected in series to the primary coil and the secondary coil, so that the primary and secondary coils generate synchronous resonance to complete energy transmission. The concrete steps are as follows: the primary side energy transmitting module comprises a primary side coil and a primary side compensation capacitor, the primary side coil is a multi-turn rectangular coil, and the capacitance value of the primary side compensation capacitor is calculated according to the resonant frequency and the self-inductance of the primary side coil. The primary coil and the resonance capacitor receive the high-frequency alternating current generated by the inverter module to resonate, an alternating electromagnetic field is generated, and energy is transmitted to the secondary coil. The secondary side energy receiving module comprises a secondary side coil and a secondary side compensation capacitor, the secondary side coil is a multi-turn rectangular coil, and the capacitance value of the secondary side compensation capacitor is calculated according to the resonance frequency and the self-inductance of the secondary side coil. The secondary coil induces alternating current with the same frequency through an alternating electromagnetic field to realize wireless transmission of electric energy.
The values of the primary side compensation capacitor and the secondary side compensation capacitor can be obtained by the following method:
when the system realizes complete compensation, namely the primary coil and the secondary coil both resonate at the angular frequency omega of the inverter, and the fundamental wave effective value of the output voltage of the inverter module is set as UinInductance of primary winding is LpPrimary side compensation capacitance of CpInductance of secondary winding is LsThe secondary side compensation capacitance is CsThe mutual inductance between the primary coil and the secondary coil is M, and the parasitic resistance of the primary coil is RpThe parasitic resistance of the secondary side coil inductance is RsThe equivalent resistance of the secondary output side is Req(ii) a The total impedance of the primary energy emitting module is ZpThe total impedance of the secondary energy emitting module is ZsThe impedance after the secondary side energy transmitting module is converted into the primary side energy transmitting module is Zr(ii) a Then:
according to kirchhoff's law, the following are obtained:
the real and imaginary parts of the reflected impedance are respectively:
the circuit parameters of the primary side energy emission module and the primary side energy emission module respectively satisfy:
the capacitance of the primary compensation capacitor and the capacitance of the secondary compensation capacitor are respectively
After the system realizes complete compensation, the voltages at two ends of the primary side energy emission module and the secondary side energy emission module are respectively obtained as follows: u shape1＝jωMI2，U2＝jωMI1(ii) a Wherein, I2Representing the current of the secondary winding, I1Representing the current of the primary coil.
The bidirectional voltage-multiplying boost rectifying module is formed by connecting two C-W voltage-multiplying circuits with a phase difference of 180 degrees in series.
The control module comprises a primary side current sampling circuit, an output voltage sampling circuit, a control circuit and a driving circuit.
U according to the preamble2＝jωMI1The purpose of controlling the output voltage can be achieved by realizing the constant current control of the primary side current, namely, the primary side current is controlled by controlling the trigger angle of a switching device in the full-bridge inverter circuit, and then the output voltage is controlled.
The primary side current sampling circuit samples the current of the primary side energy emission module, and the current is converted and conditioned and then is transmitted to the control circuit, so that the current is controlled to be constant current of the primary side current, and overcurrent protection is realized to avoid devices from being burnt out due to overcurrent. The voltage sampling circuit samples output voltage, and the main purpose is to realize overvoltage protection.
The control circuit analyzes and compares the current collected by the primary side current sampling circuit, sends a control signal to the driving circuit, and the driving circuit amplifies the control signal and drives the switching device to control the switching-on and switching-off of the switching device.
Example 2
As shown in fig. 1, an embodiment 2 of the present invention provides a long-distance low-coupling wireless power transmission system based on a bidirectional voltage-doubling circuit, where the system includes an inverter module, a wireless power transmission module, a bidirectional voltage-doubling step-up rectifier module, and a control module.
The inverter module adopts a single-phase full-bridge inverter circuit and comprises two parallel bridge arms, two fully-controlled switching devices are connected on each bridge arm in series, and the driving circuit is used for transmitting corresponding trigger signals to control the on and off of the switching devices, so that the frequency and amplitude of the output high-frequency alternating current are controlled.
As shown in fig. 2 and 3, the wireless power transmission module includes a primary energy transmitting module and a secondary energy receiving module. Due to the large air gap between the primary and secondary side coils, a large leakage inductance exists in the coupling coil, the phase difference between voltage and current is increased due to the existence of the leakage inductance, the voltage and current stress borne by the power device is increased, and the leakage inductance must be compensated. In the invention, a series-series (SS) compensation mode is adopted, namely, a compensation capacitor is respectively connected in series with the primary side coil and the secondary side coil, so that the primary side and the secondary side generate synchronous resonance to finish energy transmission.
The primary side energy transmitting module comprises a primary side coil and a primary side compensation capacitor, the primary side coil is a multi-turn rectangular coil, and the capacitance value of the primary side compensation capacitor is calculated according to the resonant frequency and the self-inductance of the primary side coil. The primary coil and the resonance capacitor receive the high-frequency alternating current generated by the inverter module to resonate, an alternating electromagnetic field is generated, and energy is transmitted to the secondary coil.
The secondary side energy receiving module comprises a secondary side coil and a secondary side compensation capacitor, the secondary side coil is also a multi-turn rectangular coil, and the capacitance value of the secondary side compensation capacitor is calculated according to the resonance frequency and the self-inductance of the secondary side coil. The secondary coil induces alternating current with the same frequency through an alternating electromagnetic field to realize wireless transmission of electric energy.
The values of the primary side compensation capacitor and the secondary side compensation capacitor can be obtained by the following method:
when the system realizes complete compensation, namely the primary coil and the secondary coil both resonate at the angular frequency omega of the inverter, and the fundamental wave effective value of the output voltage of the inverter module is set as UinInductance of primary winding is LpPrimary side compensation capacitance of CpInductance of secondary winding is LsThe secondary side compensation capacitance is CsThe mutual inductance between the primary coil and the secondary coil is M, and the parasitic resistance of the primary coil is RpThe parasitic resistance of the secondary side coil inductance is RsThe equivalent resistance of the secondary output side is Req(ii) a The total impedance of the primary energy emitting module is ZpThe total impedance of the secondary energy emitting module is ZsThe impedance after the secondary side energy transmitting module is converted into the primary side energy transmitting module is Zr(ii) a Then:
according to kirchhoff's law, the following are obtained:
the real and imaginary parts of the reflected impedance are respectively:
the circuit parameters of the primary side energy emission module and the primary side energy emission module respectively satisfy:
the capacitance of the primary compensation capacitor and the capacitance of the secondary compensation capacitor are respectively
After the system realizes complete compensation, the voltages at two ends of the primary side energy emission module and the secondary side energy emission module are respectively obtained as follows: u shape1＝jωMI2，U2＝jωMI1(ii) a Wherein, I2Representing the current of the secondary winding, I1Representing the current of the primary coil.
In embodiment 2 of the present invention, the bidirectional voltage-doubling boost rectifying module is formed by connecting two C-W voltage-doubling circuits with a phase difference of 180 ° in series. In this embodiment, the eight-voltage-doubling bidirectional voltage doubling circuit is taken as an example, and the operation mode is as follows.
As shown in fig. 4, when the voltage at the input end of the bidirectional voltage doubling circuit is Um and is positive up and negative down, for the upper half, the forward resonant current charges C1 through D1, so that the voltage at both ends of C1 is the peak value Um of the voltage at the input end, and at the same time, the current charges C3 through D3, since the voltage at both ends of the capacitor C1 is Um and is positive left and negative right, the voltage at capacitor C2 is 2Um and is positive left and negative right, and the voltage at the input end is Um and is positive up and negative down, the voltage at both ends of C3 is charged to 2 Um; similarly, for the lower half, the capacitors C6 and C8 are also charged, and the voltages across C6 and C8 are both 2Um and positive right and negative left.
As shown in fig. 5, when the voltage at the input end of the bidirectional voltage doubling circuit is Um and positive, negative and positive, for the upper half, the voltage at the input end is superimposed with the voltage at the two ends of C1 to charge C2, the voltage at the two ends of C2 is 2Um, and similarly, the voltage at the two ends of C4 is 2 Um; for the lower half, current charging C5 via D5 makes the voltage across C5 Um and right positive left negative, while current charging C7 via D7 charges C7 to 2Um due to the capacitor C5 voltage Um and right positive left negative, the capacitor C6 voltage 2Um and right positive left negative, and the input voltage Um and up negative down positive.
After charging and discharging for a period of time, finally, the C2, the C4, the C6 and the C8 are all charged to be 2Um, so that the output voltage is 4 capacitor voltages which are serially added to be 8Um, the voltage boosting function of the circuit is realized, the rectification function is also completed, and the final output voltage is N.um, wherein N is the voltage boosting multiple. The bidirectional voltage doubling circuit greatly reduces the voltage ripple and the voltage drop of the output voltage by superposing the voltage of the circuit after shifting the phase by 180 degrees.
The control module comprises a primary side current sampling circuit, an output voltage sampling circuit, a control circuit and a driving circuit.
U according to the preamble2＝jωMI1The purpose of controlling the output voltage can be achieved by realizing the constant current control of the primary side current, namely, the primary side current is controlled by controlling the trigger angle of a semiconductor switch device in the full-bridge inverter circuit, and then the output voltage is controlled.
The primary side current sampling circuit samples the current of the primary side energy emission module, and the current is converted and conditioned and then is transmitted to the control circuit, so that the current is controlled to be constant current of the primary side current, and overcurrent protection is realized to avoid devices from being burnt out due to overcurrent. The voltage sampling circuit samples output voltage, and the main purpose is to realize overvoltage protection.
The control circuit analyzes and compares the current collected by the primary side current sampling circuit, sends a control signal to the driving circuit, and the driving circuit amplifies the control signal and drives the switching device to control the switching-on and switching-off of the switching device.
As shown in fig. 6, the specific control manner of the control circuit controlling the fully-controlled switching device is as follows: sampling the primary current in each resonant period, wherein the sampling frequency in each period is n, and the sampling frequency is the maximum value I in n sampled datap-maxCalculating the peak value of the sum to obtain Ip-ppConstant current reference value I of primary coilp-refMaking a comparison, if Ip-pp＜Ip-refThe phase shift angle of the trigger pulse is decreased if Ip-pp＝Ip-refIf the trigger pulse phase shift angle is not changed, the current value of the primary coil is not changed, and if I is not changedp-max＞Ip-pp＞Ip-refIncreasing the phase shift angle of the trigger pulse, reducing the current value of the primary coil, and if I is greaterp-pp＞Ip-maxThe pulse is directly blocked to play the role of overcurrent protection.
In FIG. 6, Ug1～Ug4For driving signals to four fully-controlled switching devices of the inverter module, UdcFor the DC input voltage of the inverter module, UPThe on time and the off time of the fully-controlled switching device in the inversion module can be changed by changing the phase shift angle α, so that the output voltage value U of the inversion module is changedPThereby changing the primary side current value Ip. The expression for the effective value of the primary current can be derived as:
in summary, in the remote low-coupling wireless power transmission system based on the bidirectional voltage doubling circuit according to the embodiment of the present invention, power is transmitted through electromagnetic induction between the primary coil and the secondary coil, and for the disadvantage of low output voltage in the remote low-coupling state, the bidirectional voltage doubling circuit is added at the rear stage of the secondary coil to increase the output voltage and complete rectification, so that the disadvantage that the output voltage is difficult to increase under the remote low-coupling condition is overcome, and the application range of wireless power transmission is expanded.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A wireless power transmission system based on a bidirectional voltage doubling circuit, comprising:
the inverter module is used for converting the direct current input voltage into alternating current input voltage;
the wireless power transmission module is used for transmitting the alternating current input voltage to the bidirectional voltage-multiplying boosting rectification module; the wireless power transmission module comprises a primary side energy transmitting module and a secondary side energy receiving module; the primary side energy transmitting module is used for receiving the alternating current input voltage and generating an alternating electromagnetic field; the secondary side energy receiving module is used for generating a same-frequency alternating current input voltage with the same frequency as the alternating current input voltage by using the alternating electromagnetic field;
the bidirectional voltage-multiplying boosting rectifying module is used for converting the same-frequency alternating-current input voltage into direct-current output voltage;
and the control module is used for adjusting the direct current output voltage by adjusting the phase shift angle of the trigger signal of the inversion module.
2. The wireless power transmission system based on the bidirectional voltage doubling circuit according to claim 1, wherein the positive and negative poles of the direct current input are connected with the input end of the inversion module; the output end of the inversion module is connected with the input end of the wireless electric energy transmission module; the output end of the wireless power transmission module is connected with the input end of the bidirectional voltage-multiplying boosting rectification module; the output of the bidirectional voltage-multiplying boosting rectifying module is the final direct-current output voltage.
3. The wireless power transmission system based on the bidirectional voltage doubling circuit according to claim 1, wherein the inverter module is a single-phase full-bridge inverter circuit, and comprises two parallel-connected bridge arms, and each bridge arm is provided with two fully-controlled switching devices.
4. The wireless power transmission system based on the bidirectional voltage doubling circuit according to claim 1, wherein the primary energy transmitting module comprises a primary coil, and the secondary energy receiving module comprises a secondary coil; the primary coil is connected with a primary compensation capacitor in series, and the secondary coil is connected with a secondary compensation capacitor in series.
5. The wireless power transmission system based on the bidirectional voltage doubling circuit according to claim 4, wherein the primary coil is a multi-turn rectangular coil, and the capacitance value of the primary compensation capacitor is calculated according to the resonant frequency and the self-inductance of the primary coil; the secondary coil is a multi-turn rectangular coil, and the capacitance value of the secondary compensation capacitor is obtained through calculation according to the resonance frequency and the self-inductance of the secondary coil.
6. The wireless power transmission system based on the bidirectional voltage doubling circuit of claim 5, wherein:
when the system realizes complete compensation, namely the primary coil and the secondary coil both resonate at the angular frequency omega of the inverter, and the fundamental wave effective value of the output voltage of the inverter module is set as UinInductance of primary winding is LpPrimary side compensation capacitance of CpInductance of secondary winding is LsThe secondary side compensation capacitance is CsThe mutual inductance between the primary coil and the secondary coil is M, and the parasitic resistance of the primary coil is RpThe parasitic resistance of the secondary side coil inductance is RsThe equivalent resistance of the secondary output side is Req(ii) a The total impedance of the primary energy emitting module is ZpThe total impedance of the secondary energy emitting module is ZsThe impedance after the secondary side energy transmitting module is converted into the primary side energy transmitting module is Zr(ii) a Then:
according to kirchhoff's law, the following are obtained:
the real and imaginary parts of the reflected impedance are respectively:
the circuit parameters of the primary side energy emission module and the primary side energy emission module respectively satisfy:
the capacitance of the primary compensation capacitor and the capacitance of the secondary compensation capacitor are respectively
7. The wireless power transmission system based on the bidirectional voltage doubling circuit as claimed in claim 1, wherein the bidirectional voltage doubling boost rectifying module is composed of a bidirectional voltage doubling circuit, and the bidirectional voltage doubling circuit simultaneously boosts and rectifies the alternating current received by the secondary side energy receiving module to obtain a direct current output voltage.
8. The wireless power transmission system based on the bidirectional voltage-multiplying circuit as claimed in claim 7, wherein the bidirectional voltage-multiplying rectifying module comprises two C-W voltage-multiplying circuits with a phase difference of 180 ° connected in series.
9. The wireless power transmission system based on the bidirectional voltage doubling circuit according to claim 1, wherein the control module comprises a primary side current sampling circuit, an output voltage sampling circuit, a control circuit and a driving circuit;
the primary side current sampling circuit is used for collecting the primary side current of the primary side energy emission module, and the primary side current is converted and conditioned and then is transmitted to the control circuit;
the output voltage sampling circuit is used for collecting the direct current output voltage signal;
the control circuit is used for sending a control signal according to the primary side current converted and conditioned by the primary side current sampling circuit and sending the control signal to the driving circuit;
and the driving circuit is used for controlling the frequency and the amplitude of the alternating current input voltage output by the inversion module according to the control signal.
10. The wireless power transmission system based on the bidirectional voltage doubling circuit of claim 9,
the primary side current sampling circuit samples the primary side current in each resonant period, the sampling frequency in each period is n, and the sampling frequency is the maximum value I in n data obtained by samplingp-maxCalculating the peak value I of the primary current by the sum minimum valuep-pp；
Control circuit pair Ip-ppAnd a primary current reference value Ip-refComparing; wherein the content of the first and second substances,
if Ip-pp＜Ip-refIf the current value of the primary coil is larger than the preset value, the control circuit sends a signal for reducing the trigger pulse phase shift angle to the driving circuit, and the driving circuit changes the turn-on time and the turn-off time of a fully-controlled switching device in the inverter module according to the signal, reduces the trigger pulse phase shift angle and increases the current value of the primary coil;
if Ip-pp＝Ip-refIf the current value of the primary coil is not changed, the control circuit sends a signal for keeping the trigger pulse phase shift angle unchanged to the driving circuit, the driving circuit enables the turn-on time and the turn-off time of the fully-controlled switching device in the inverter module to be kept unchanged according to the signal, the trigger pulse phase shift angle is kept unchanged, and the current value of the primary coil is kept unchanged;
if Ip-max＞Ip-pp＞Ip-refIf the current value of the primary coil is larger than the preset value, the control circuit sends a signal for increasing the trigger pulse phase shift angle to the driving circuit, and the driving circuit changes the turn-on time and the turn-off time of a fully-controlled switching device in the inverter module according to the signal, so that the trigger pulse phase shift angle is increased and the current value of the primary coil is reduced;
if Ip-pp＞Ip-maxAnd the control circuit sends a signal for closing the trigger pulse to the drive circuit, and the drive circuit closes the fully-controlled switching device of the inverter module according to the signal, blocks the trigger pulse and performs overcurrent protection.
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