CN108808875B - Constant-current and constant-voltage wireless charging system and wireless charging method suitable for battery characteristics - Google Patents
Constant-current and constant-voltage wireless charging system and wireless charging method suitable for battery characteristics Download PDFInfo
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- CN108808875B CN108808875B CN201810509820.1A CN201810509820A CN108808875B CN 108808875 B CN108808875 B CN 108808875B CN 201810509820 A CN201810509820 A CN 201810509820A CN 108808875 B CN108808875 B CN 108808875B
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- 238000007600 charging Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims description 19
- 238000010168 coupling process Methods 0.000 claims description 19
- 238000005859 coupling reaction Methods 0.000 claims description 19
- 238000010280 constant potential charging Methods 0.000 claims description 12
- 238000010277 constant-current charging Methods 0.000 claims description 8
- 230000001960 triggered effect Effects 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000010363 phase shift Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
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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
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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
- H02J50/80—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
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- H02J7/0077—
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Abstract
The invention discloses a constant-current and constant-voltage wireless charging system and a wireless charging method suitable for battery characteristics. The secondary side compensation topology integrates two topologies with constant current and constant voltage output characteristics into one circuit, but the two topologies are respectively designed at different resonant frequency points, and the circuit achieves the constant current and constant voltage output characteristics by controlling and switching the working frequency of the primary side. The DSP signal generator is connected between the inversion unit and the rectification unit, obtains a current signal of a load end through sampling, and then realizes switching of the primary side working frequency. The invention does not need additional DC-DC conversion, thus reducing the volume and the loss of the circuit; the system can realize zero-voltage switching and has high efficiency; frequency splitting and other phenomena cannot be caused; the control system is simple and easy to operate.
Description
Technical Field
The present invention relates to a charging system and a wireless charging method, and more particularly, to a wireless charging system and a wireless charging control method suitable for battery characteristics, and belongs to the field of wireless charging.
Background
Existing charging methods include contact charging and wireless non-contact charging. The non-contact charging has the advantages of convenience in operation, safety, simplicity, no contact abrasion, no direct electrical connection and the like, does not need manual operation, and has a wide application prospect.
The most common charging method for the storage battery at present is constant-current constant-voltage charging: the first stage is charging with constant current; when the voltage reaches a preset value, the second stage is carried out to carry out constant voltage charging, and the current is gradually reduced; when the charging current reaches zero, the battery is fully charged.
Most single-stage circuits can adopt two modes for realizing constant voltage and constant current charging: firstly, phase shift control with a large phase shift range is adopted in the whole charging stage, but phase shift angles in most regions are large; and secondly, charging by adopting different topologies at different stages by adopting a switching topology mode. The above method brings about an increase in circuit loss and a more complicated control system. Therefore, the present invention provides a new idea to effectively solve the above problems.
Disclosure of Invention
The invention aims to provide a wireless charging system which has high output power factor and can realize stable output of constant current and constant voltage, and also provides a wireless charging control method which can achieve the purpose.
In order to achieve the purpose, the invention adopts the following technical scheme:
a constant-current and constant-voltage wireless charging system suitable for battery characteristics comprises a direct-current power supply, an inversion module, a loose coupling transformer, a secondary compensation topology, a rectification module, a load battery and a DSP signal generator, wherein the direct-current power supply is connected with the inversion module to provide direct-current input voltage, the inversion module is triggered by a PWM signal to generate high-frequency alternating voltage, the inversion module is connected with the loose coupling transformer, the rectification module rectifies and filters current at the output end of the loose coupling transformer to obtain a direct-current signal for charging the load battery,
the receiving end of the loose coupling transformer comprises two independent receiving coils, the two receiving coils are respectively connected with a compensation topology, one of the two receiving coils is connected in series, the other receiving coil is connected in parallel, the two compensation topologies form the secondary side compensation topology, and LC loops formed by the two receiving coils and the compensation topology are respectively designed at different resonant frequencies.
Preferably, the loose coupling transformer comprises a magnetic core, a transmitting coil and a receiving coil; the number of the transmitting coils is one, and the number of the receiving coils is two; the transmitting coil is wound on the strip-shaped magnetic core in a solenoid winding mode; the receiving coils are in a plane winding mode, and a shielding layer is arranged between the two receiving coils and is decoupled with each other; the number of turns of two receiving coils wound on the same plane magnetic core has a difference of more than 2 times.
The invention discloses a constant-current and constant-voltage wireless charging method of the system,
the direct current power supply is connected with the inversion module to provide direct current input voltage, the inversion module is triggered by the PWM signal to generate high-frequency alternating voltage, the inversion module is connected with the loose coupling transformer to provide alternating current input,
the rectifying module rectifies and filters the current at the output end of the loose coupling transformer to obtain a direct current signal for charging a load battery,
the voltage and current signals of the load battery are obtained through sampling, whether the system needs to be in a constant-current or constant-voltage charging stage is judged, duty ratio and frequency signals are obtained through a logic operation module of the DSP signal generator according to a designed resonance frequency point and are input into the DSP signal generator, corresponding PWM control signals are output by the DSP signal generator, and switching of the primary side working frequency is achieved.
Preferably, the system is charged with a constant current; when the voltage reaches a preset value, constant voltage charging is carried out, and the current is gradually reduced; when the charging current reaches zero, the battery is fully charged.
Preferably, when constant current charging is required, the primary side working frequency is switched to low frequency, so that the receiving coil with the series compensation topology works, and the load performs constant current charging;
when constant voltage charging is needed, the primary side working frequency is switched to high frequency, so that the receiving coil with the parallel compensation topology works, and the load is charged at constant voltage.
Preferably, the two receiving coils and the compensation topology are designed to have different resonant frequencies, and the resonant frequencies are different by more than 10 times.
Compared with the prior art, the invention has the advantages that:
the invention does not need additional DC-DC conversion, thus reducing the volume and the loss of the circuit; the system can realize zero-voltage switching and has high efficiency; frequency splitting and other phenomena cannot be caused; the control system is simple and easy to operate.
Drawings
Fig. 1 is a schematic diagram of a wireless charging system according to the present invention.
Fig. 2 is a schematic diagram of a loosely coupled transformer of the present invention.
Fig. 3 is a process diagram of a control method of wireless charging according to the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a wireless charging system according to the present invention. As shown in fig. 1, the wireless charging device includes a dc power supply (i), an inverter module (ii), a loose coupling transformer (iii), a secondary compensation topology (iv), a rectifier module (iv), a battery (iv), and a DSP signal generator (v).
The inversion module is composed of 4 switching tubes and converts direct current signals into high-frequency alternating current signals. The single rectifier module is composed of 4 uncontrolled diodes, and converts the AC signal into DC signal to supply power to the load. Each receiving coil and the compensation topology are respectively connected with one rectifying module, and the total number of the rectifying modules is two.
The direct current power supply is connected with an inversion module to provide direct current input voltage, the inversion module is triggered by a PWM signal to generate high-frequency alternating voltage and is connected with a loose coupling transformer to provide an alternating current power supply signal, and the rectification module is used for rectifying and filtering current at the output end of the loose coupling transformer to obtain a direct current signal which is used for charging a battery. Meanwhile, a direct current signal is input into a DSP signal generator to adjust the working frequency of wireless charging.
Furthermore, the secondary side compensation topology integrates two topologies with constant current and constant voltage output characteristics into a circuit, the two receiving coils are respectively connected with one compensation topology, one of the two compensation topologies is connected in series, the other one of the two compensation topologies is connected in parallel, the two compensation topologies form the secondary side compensation topology, and LC loops formed by the two receiving coils and the compensation topologies are respectively designed at different resonant frequencies. The circuit achieves the output characteristics of constant current and constant voltage by controlling the working frequency of the switching primary side.
Further, as shown in fig. 2, the loose coupling transformer (c) includes a magnetic core, a transmitting end and a receiving end. The transmitting end consists of a single coil and the receiving end consists of two independent coils together with a compensation topology. The two coils at the receiving end, together with the compensation topology, are designed for different resonance frequencies. The transmitting coil is wound on the strip-shaped magnetic core in a solenoid winding mode; the receiving coils are in a plane winding mode, and a shielding layer is arranged between the two receiving coils and is decoupled with each other; the number of turns of two receiving coils wound on the same plane magnetic core has a difference of more than 2 times.
The invention also provides a wireless charging method or a wireless charging control method, current and voltage signals of a load end are obtained through sampling, the current and voltage signals are input into the DSP logic operation module through the capture module of the DSP, the system is judged to be in a constant voltage or constant current mode, and a PWM control signal is output by the DSP signal generator according to a designed resonance frequency point, so that the switching of the primary side working frequency is realized. As shown in fig. 3:
the first step, the logic operation module controls the first stage to charge with constant current;
secondly, detecting output voltage and current signals of the rectifier module;
and step three, judging whether the output voltage of the rectifying module reaches a preset value. If the preset value is reached, entering a fourth step; if the preset value is not reached, continuing the first step;
step four, constant voltage charging is carried out;
and a fifth step of judging whether the battery is fully charged. If full, entering a sixth step; if not, continuing the fourth step;
and a sixth step of ending the charging.
The specific charging process comprises the following steps: the direct current power supply is connected with the inversion module to provide direct current input voltage, the inversion module is triggered by the PWM signal to generate high-frequency alternating voltage, the inversion module is connected with the loose coupling transformer to provide alternating current input,
the rectifying module rectifies and filters the current at the output end of the loose coupling transformer to obtain a direct current signal for charging a load battery,
the voltage and current signals of the load battery are obtained through sampling, whether the system needs to be in a constant-current or constant-voltage charging stage is judged, duty ratio and frequency signals are obtained through a logic operation module of the DSP signal generator according to a designed resonance frequency point and are input into the DSP signal generator, corresponding PWM control signals are output by the DSP signal generator, and switching of the primary side working frequency is achieved.
The system is charged by constant current; when the voltage reaches a preset value, constant voltage charging is carried out, and the current is gradually reduced; when the charging current reaches zero, the battery is fully charged.
When constant current charging is needed, the primary side working frequency is switched to be low frequency, so that the receiving coil with the series compensation topology works, and the load is charged with constant current;
when constant voltage charging is needed, the primary side working frequency is switched to high frequency, so that the receiving coil with the parallel compensation topology works, and the load is charged at constant voltage.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (3)
1. A charging method of a constant-current and constant-voltage wireless charging system suitable for battery characteristics comprises a direct-current power supply, an inversion module, a loose coupling transformer, a secondary compensation topology, a rectification module, a load battery and a DSP signal generator, wherein the direct-current power supply is connected with the inversion module to provide direct-current input voltage, the inversion module is triggered by a PWM signal to generate high-frequency alternating voltage, the inversion module is connected with the loose coupling transformer, and the rectification module rectifies and filters current at the output end of the loose coupling transformer to obtain a direct-current signal for charging the load battery; the receiving end of the loose coupling transformer comprises two independent receiving coils, the two receiving coils are respectively connected with a compensation topology, one of the two receiving coils is connected in series, the other receiving coil is connected in parallel, the two compensation topologies form the secondary side compensation topology, and LC loops formed by the two receiving coils and the compensation topology are respectively designed at different resonant frequencies; and the resonance frequency difference is more than 10 times;
the charging method is characterized by comprising the following steps:
the direct current power supply is connected with the inversion module to provide direct current input voltage, the inversion module is triggered by the PWM signal to generate high-frequency alternating voltage, the inversion module is connected with the loose coupling transformer to provide alternating current input,
the rectifying module rectifies and filters the current at the output end of the loose coupling transformer to obtain a direct current signal for charging a load battery,
obtaining a voltage and current signal of a load battery through sampling, judging whether the system needs to be in a constant-current or constant-voltage charging stage, obtaining a duty ratio and a frequency signal through a logic operation module of a DSP signal generator according to a designed resonance frequency point, inputting the duty ratio and the frequency signal into the DSP signal generator, outputting a corresponding PWM control signal, and realizing the switching of the primary side working frequency;
when constant current charging is needed, the primary side working frequency is switched to be low frequency, so that the receiving coil with the series compensation topology works, and the load is charged with constant current;
when constant voltage charging is needed, the primary side working frequency is switched to high frequency, so that the receiving coil with the parallel compensation topology works, and the load is charged at constant voltage.
2. The charging method of claim 1, wherein the loosely coupled transformer comprises a magnetic core, a transmitting coil, a receiving coil; the number of the transmitting coils is one, and the number of the receiving coils is two; the transmitting coil is wound on the strip-shaped magnetic core in a solenoid winding mode; the receiving coils are in a plane winding mode, and a shielding layer is arranged between the two receiving coils and is decoupled with each other.
3. The method of claim 1, wherein the system is first charged with a constant current; when the voltage reaches a preset value, constant voltage charging is carried out, and the current is gradually reduced; when the charging current reaches zero, the battery is fully charged.
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| CN110138101A (en) * | 2019-05-20 | 2019-08-16 | 清华大学 | A kind of wireless power supply system circuit topology applied to rail traffic |
| CN110518711A (en) * | 2019-09-04 | 2019-11-29 | 西南交通大学 | A kind of more reception inductive electric energy transmission systems decoupled using passive element |
| CN112421734A (en) * | 2020-12-02 | 2021-02-26 | 青岛大学 | Single-stage high-order compensation constant-current constant-voltage wireless charging device and method |
| CN113162136B (en) * | 2021-03-04 | 2022-12-16 | 广西电网有限责任公司电力科学研究院 | Wireless charging system and method |
| CN113193662B (en) * | 2021-04-28 | 2024-02-02 | 安徽工业大学 | Variable-frequency constant-current constant-voltage control device and method for wireless charging system |
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| CN105656215A (en) * | 2016-03-25 | 2016-06-08 | 浙江大学 | Wireless energy transmission device for high-voltage transmission line non-contact power supply and method thereof |
| US9812893B2 (en) * | 2011-07-14 | 2017-11-07 | Samsung Electronics Co., Ltd | Wireless power receiver |
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| CN107769573B (en) * | 2017-11-20 | 2019-07-23 | 东南大学 | The WPT system constant current constant voltage of bilateral LCC network exports adjustable parameter setting method |
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| US9812893B2 (en) * | 2011-07-14 | 2017-11-07 | Samsung Electronics Co., Ltd | Wireless power receiver |
| CN105656215A (en) * | 2016-03-25 | 2016-06-08 | 浙江大学 | Wireless energy transmission device for high-voltage transmission line non-contact power supply and method thereof |
Non-Patent Citations (1)
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