CN107769544B - Load end voltage stabilizing circuit for wireless power transmission system and control method thereof - Google Patents
Load end voltage stabilizing circuit for wireless power transmission system and control method thereof Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Abstract
The invention relates to a load end voltage stabilizing circuit for a wireless power transmission system and a control method thereof, wherein the load end voltage stabilizing circuit comprises an alternating current voltage source, an energy receiving coil, a compensating capacitor, a first P-Mosfet tube, a second P-Mosfet tube, a first N-Mosfet tube, a second N-Mosfet tube, a first diode, a second diode, a filter inductor and a filter capacitor; one end of the energy receiving coil is connected with one end of the alternating-current voltage source, and the other end of the energy receiving coil is connected with one pole of the compensation capacitor; the other end of the alternating voltage source is connected with the other pole of the compensation capacitor; the drain electrodes d of the first P-Mosfet tube and the second P-Mosfet tube and the drain electrodes d of the first N-Mosfet tube and the second N-Mosfet tube are connected together; the source electrode s of the first P-Mosfet tube is connected with the source electrode s of the first N-Mosfet tube; the source electrode s of the second P-Mosfet tube is connected with the source electrode s of the second N-Mosfet tube; the invention makes the circuit work in four modes. The circuit realizes the function of stabilizing the output voltage of the system according to the requirement of the load by taking the output voltage as a control object and the output power as a control target.
Description
Technical Field
The invention relates to a voltage stabilizing circuit, in particular to a load end voltage stabilizing circuit for a wireless power transmission system and a control method thereof.
Background
The wireless electric energy transmission technology is a new technology which comprehensively utilizes a power electronic technology, a magnetic field coupling technology, a modern control theory and the like and realizes non-electric direct contact electric energy transmission of electric energy from a static power supply system to one or more mobile electric devices through a coupling magnetic field between an energy sending end and an energy load end. The technology realizes wireless transmission of energy, avoids the safety problem caused by friction, corrosion, poor contact and the like of the conductor connecting part, is particularly suitable for being applied to underwater, inflammable and explosive and other occasions, and has good application prospect.
Wireless power transmission systems often use resonance to maximize the output power of the system. In practical applications, the load of the wireless power transmission system is often required to be variable, but during the energy transmission process, the load variation can cause the system operating frequency to drift and the current to suddenly change, and finally the output voltage is unstable. On the other hand, the wireless power transmission system usually includes more energy storage elements, the system order thereof is generally higher than 3, and the system presents serious switching nonlinearity due to the inclusion of the nonlinear switching network, so that the voltage stabilizing controller needs to be designed by means of a complex modeling method and a parameter design process.
At present, voltage stabilization control of a wireless power transmission system is generally realized in a circuit form: and a DC-DC converter is connected in series on the primary side, and the output voltage of the system is regulated by regulating the input voltage of the high-frequency inverter. 1) And in the detuning control, the primary side or the secondary side enables the system to be in a tuning or non-tuning state by accessing a switch capacitor and a phase control inductor, so that the purpose of controlling the output voltage is achieved. 2) The secondary side is connected with a DC-DC converter in series to realize local voltage stabilization control of the load end so as to adapt to different loads. 3) And (5) decoupling control of secondary short circuit. A set of decoupling coils are connected in parallel at the load end or a circuit breaker is connected in parallel on the load coil, and the output voltage can be adjusted by controlling the decoupling at the load end with a certain frequency and duty ratio. 4) And primary side energy injection control, wherein after the zero crossing of the primary side current is detected, the controller judges whether the resonant network is connected to the power supply injection energy according to the output voltage of the system.
The methods 1), 3) and 4) regulate the output voltage in a chopping mode, generate larger energy loss at the moment of short circuit or open circuit of a switching tube, increase the cost and the volume of the system, and reduce the efficiency and the reliability of the system to different degrees; the method 2) is only suitable for a low-power circuit, and the resonance current is greatly distorted when the system is lightly loaded, so that the robustness of the system is poor.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned deficiencies in the prior art and to provide a load side voltage regulator circuit for a wireless power transmission system and a control method thereof.
The technical scheme adopted for realizing the aim of the invention is a load end voltage stabilizing circuit for a wireless electric energy transmission system, which comprises an alternating current voltage source, an energy receiving coil, a compensation capacitor, a first P-Mosfet tube, a second P-Mosfet tube, a first N-Mosfet tube, a second N-Mosfet tube, a first diode, a second diode, a filter inductor and a filter capacitor;
one end of the energy receiving coil is connected with one end of the alternating-current voltage source, and the other end of the energy receiving coil is connected with one pole of the compensation capacitor; the other end of the alternating voltage source is connected with the other pole of the compensation capacitor;
the drain electrodes d of the first P-Mosfet tube and the second P-Mosfet tube and the drain electrodes d of the first N-Mosfet tube and the second N-Mosfet tube are connected together; the source electrode s of the first P-Mosfet tube is connected with the source electrode s of the first N-Mosfet tube; the source electrode s of the second P-Mosfet tube is connected with the source electrode s of the second N-Mosfet tube; the cathode of the first diode is connected with the source electrode s of the first P-Mosfet tube, the cathode of the second diode is connected with the source electrode s of the second P-Mosfet tube, and the anodes of the first diode and the second diode are connected;
one end of the filter inductor is connected with the drain electrode of the first P-Mosfet tube, the other end of the filter inductor is connected with one pole of the filter capacitor, and the other pole of the wave capacitor is connected with the anode of the first diode.
In addition, the present invention further provides a method for controlling a load side voltage stabilizing circuit for a wireless power transmission system, including:
a voltage stabilizing circuit is designed according to the characteristic that a wireless power transmission system transmits energy in a resonance mode, the output voltage and the output energy state of the circuit are analyzed from the energy angle, the circuit at a load end is divided into four modes for analysis, and a U is arrangedoutV is the output voltage reference, and the upper and lower hysteresis loop widths are respectively Delta V1And Δ V2The circuit performs energy injection or energy dissipation by analyzing the variation trend of the output voltage so as to maintain the stability of the output voltage, and a single working mode is converted into two modes to alternately work when the load circuit works in a steady state due to the introduction of a voltage control link;
when the voltage is started to be executed, firstly, the variation trend of the voltage is detected, if the variation trend of the voltage is increased, then whether the output voltage is smaller than the output upper limit is detected, if so, the two P-Mos tubes are alternately conducted, energy is injected, the output voltage is increased, otherwise, the two N-Mos tubes are alternately conducted, but the injected energy is larger than the energy consumed by the load at the moment, the output voltage can be continuously increased, when the injected energy and the consumed energy are balanced, the output voltage reaches the highest value, then the two N-Mos tubes stop working, the energy injection state is entered, but the injected energy is smaller than the energy consumed by the load, the voltage can be decreased, and when the injected energy is reduced to the output lower limit, the energy injection is larger than the energy consumption, the voltage starts to be increased, the cycle is repeated, and whether the output voltage is smaller than; if the change trend of the voltage is reduced, detecting whether the output voltage is greater than the output upper limit, if so, the voltage is in an energy dissipation state, and the voltage is reduced, otherwise, the voltage is in an energy injection state, but the injection energy is less than the energy consumed by the load, and the output voltage can continue to be reduced; when the output voltage is reduced to the lower output limit, the energy injection is larger than the consumption, the voltage starts to rise, the operation is repeated, and whether the output voltage is smaller than the upper output limit is detected.
According to the invention, two kinds of Mosfet tubes are reversely connected in parallel, and then form a voltage stabilizing circuit with the diode and the filter circuit, so that the circuit can work under four modes. The circuit realizes the function of stabilizing the output voltage of the system according to the requirement of the load by taking the output voltage as a control object and the output power as a control target.
Drawings
Fig. 1 is an equivalent circuit diagram of a load side voltage stabilizing circuit of a wireless power transmission system according to the present invention.
Fig. 2 is a voltage stabilizing circuit diagram and a working mode analysis diagram of the load end energy injection type wireless power transmission system of the present invention.
FIG. 3 is a schematic diagram illustrating the operation of the voltage regulator circuit.
Fig. 4 is a control flow chart of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The basic structure of a load end voltage stabilizing circuit of the wireless power transmission system is shown in figure 1, and the voltage stabilizing circuit consists of an alternating current voltage source (1), an energy receiving coil (2), a compensating capacitor (3), two P-Mosfet tubes (5) and (7), two N-Mosfet tubes (6) and (4), two diodes (8) and (9), a filter inductor (10), a filter capacitor (11) and a load (12).
The two P-Mos tubes are always in an alternative conduction state, when the two N-Mos tubes are conducted alternatively, the system is in a capacity dissipation state, and when the two N-Mos tubes do not work, the system is in a capacity injection state.
The two kinds of Mosfet tubes are connected in parallel in an opposite direction, and then form a voltage stabilizing circuit with the diode and the filter circuit, so that the circuit can work under four modes. The circuit realizes the function of stabilizing the output voltage of the system according to the requirement of the load by taking the output voltage as a control object and the output power as a control target
In fig. 2, Switch1 and Switch2 are P-type mosfets, and Switch3 and Switch4 are N-type mosfets. When the Switch tubes Switch1 and Switch2 are according to VinWhen the zero-crossing signal is turned on alternately, the system is in a resonance state, energy is injected into the output capacitor, and the output voltage rises, as shown in fig. 2(b) and (c).
When the switching tubes Switch3 and Switch4 are alternately switched on according to the zero-crossing signal of the current at the load end, the switching tubes and the Switch1 or Switch2 together short circuit the load and the compensation capacitor, the primary side and the secondary side of the system are in a non-resonant state, the primary side reflection impedance is increased, the inversion output voltage is reduced, and the system injection energy is reduced. The output capacitor discharges energy to the load until the Switch3 and Switch4 stop working after the output voltage is reduced to the reference voltage, and the system enters the energy injection state again, as shown in fig. 2(c), (d).
The system output voltage and four switching tube control pulses are shown in FIG. 3. At ta-tbAt the moment, two Switch tubes of the load end Switch1 and Switch2 are according to VinThe zero-crossing signal is alternatively conducted, the system is in an energy injection state, and the output voltage is increased.
At tb-tcAt the moment, the output voltage of the system starts to be higher than the upper limit of the output voltage, the Switch3 or the Switch4 alternately starts to work according to the zero-crossing signal of the load current, the Switch1 or the Switch2 together with the load is in short circuit, the system enters an energy dissipation state, however, due to the existence of energy storage elements such as an inductor, the injected energy is still larger than the energy consumed by the load, the output voltage of the system continuously rises, and the output voltage of the system at tcAt the moment, the energy injected and consumed by the system reaches the balance, and the output voltage of the system is the highest.
At tc-tdAt the moment, the system is still in the energy dissipation state, and the injected energy is less than the load consumptionThe output voltage starts to drop and at tdWhen the time is reduced to the upper limit of the system output voltage, the Switch tube Switch3 and the Switch4 stop working.
At td-tfAt the moment, the system enters an energy injection state, but the inductive current cannot change suddenly, the injection energy is still smaller than the load dissipation energy at the moment, the output voltage of the system continues to drop, and the energy injection state is tfThe time drops to the lower limit of the output voltage.
At tf-tgAt that point, the system continues to be in the energy injection state and the injected energy is greater than the load dissipated energy, and the system output voltage begins to rise. At the end of this voltage change period, the whole control flow is shown in fig. 4.
Claims (1)
1. A control method for a load end voltage stabilizing circuit of a wireless power transmission system is disclosed, wherein the load end voltage stabilizing circuit comprises an alternating current voltage source, an energy receiving coil, a compensation capacitor, a first P-Mosfet tube, a second P-Mosfet tube, a first N-Mosfet tube, a second N-Mosfet tube, a first diode, a second diode, a filter inductor and a filter capacitor;
one end of the energy receiving coil is connected with one end of the alternating-current voltage source, and the other end of the energy receiving coil is connected with one pole of the compensation capacitor; the other end of the alternating voltage source is connected with the other pole of the compensation capacitor;
the drain electrodes d of the first P-Mosfet tube and the second P-Mosfet tube and the drain electrodes d of the first N-Mosfet tube and the second N-Mosfet tube are connected together; the source electrode s of the first P-Mosfet tube is connected with the source electrode s of the first N-Mosfet tube; the source electrode s of the second P-Mosfet tube is connected with the source electrode s of the second N-Mosfet tube; the cathode of the first diode is connected with the source electrode s of the first P-Mosfet tube, the cathode of the second diode is connected with the source electrode s of the second P-Mosfet tube, and the anodes of the first diode and the second diode are connected;
one end of the filter inductor is connected with the drain electrode of the first P-Mosfet tube, the other end of the filter inductor is connected with one pole of the filter capacitor, and the other pole of the filter capacitor is connected with the anode of the first diode; the control method is characterized by comprising the following steps:
designed according to the characteristic that the wireless power transmission system transmits energy by means of resonanceThe output voltage and the output energy state of the circuit are analyzed from the energy perspective, the circuit at the load end is divided into four modes for analysis, and a U is arrangedoutV is the output voltage reference, and the upper and lower hysteresis loop widths are respectively Delta V1And Δ V2The circuit performs energy injection or energy dissipation by analyzing the variation trend of the output voltage so as to maintain the stability of the output voltage, and a single working mode is converted into two modes to alternately work when the load circuit works in a steady state due to the introduction of a voltage control link;
when the voltage is started to be executed, firstly, the variation trend of the voltage is detected, if the variation trend of the voltage is increased, then whether the output voltage is smaller than the output upper limit is detected, if so, the two P-Mos tubes are alternately conducted, energy is injected, the output voltage is increased, otherwise, the two N-Mos tubes are alternately conducted, but the injected energy is larger than the energy consumed by the load at the moment, the output voltage can be continuously increased, when the injected energy and the consumed energy are balanced, the output voltage reaches the highest value, then the two N-Mos tubes stop working, the energy injection state is entered, but the injected energy is smaller than the energy consumed by the load, the voltage can be decreased, and when the injected energy is reduced to the output lower limit, the energy injection is larger than the energy consumption, the voltage starts to be increased, the cycle is repeated, and whether the output voltage is smaller than; if the change trend of the voltage is reduced, detecting whether the output voltage is greater than the output upper limit, if so, the voltage is in an energy dissipation state, and the voltage is reduced, otherwise, the voltage is in an energy injection state, but the injection energy is less than the energy consumed by the load, and the output voltage can continue to be reduced; when the output voltage is reduced to the lower output limit, the energy injection is larger than the consumption, the voltage starts to rise, the operation is repeated, and whether the output voltage is smaller than the upper output limit is detected.
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| JP2001345689A (en) * | 2000-06-02 | 2001-12-14 | Seiko Instruments Inc | Predriver circuit of switching regulator |
| CN1305210C (en) * | 2002-01-08 | 2007-03-14 | 浙江大学 | DC-DC power transfer device with zero voltage soft switch |
| CN103208923B (en) * | 2012-04-24 | 2015-03-18 | 盐城工学院 | Control method of power converter for converting input high-frequency alternative-current square wave into output direct current |
| CN103607124B (en) * | 2013-11-28 | 2015-12-30 | 浙江图维电力科技有限公司 | A kind of electricity getting device based on non-closed current transformer and control method thereof |
| DE102015116995A1 (en) * | 2015-10-06 | 2017-04-06 | Infineon Technologies Austria Ag | Power factor correction circuit and method of operation |
| US20170170739A1 (en) * | 2015-12-11 | 2017-06-15 | National Chung-Shan Institute Of Science & Technology | Solar power converter with isolated bipolar full-bridge resonant circuit |
| CN107046370B (en) * | 2016-02-09 | 2020-05-26 | 松下知识产权经营株式会社 | Converter, power transmission system and controller |
| CN106533185B (en) * | 2016-12-29 | 2018-12-11 | 哈尔滨工业大学 | Radio energy transmission system compensation topology structure |
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Effective date of registration: 20190912 Address after: 430078 High-tech Avenue 999, Donghu New Technology Development Zone, Wuhan City, Hubei Province Applicant after: Wuhan Guangrui Lian Technology Co., Ltd. Address before: 430056 Hubei city of Wuhan province Kuanshan East Lake Development Zone Industrial Park Avenue, the Wuhan Polytechnic University research base of 1 building 103 room Applicant before: Wuhan Hui Chi Technology Co., Ltd. |
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