CN110676948A - Wireless power supply circuit based on LLC topological structure - Google Patents
Wireless power supply circuit based on LLC topological structure Download PDFInfo
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- CN110676948A CN110676948A CN201910967515.1A CN201910967515A CN110676948A CN 110676948 A CN110676948 A CN 110676948A CN 201910967515 A CN201910967515 A CN 201910967515A CN 110676948 A CN110676948 A CN 110676948A
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- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 230000005674 electromagnetic induction Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005684 electric field Effects 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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
Abstract
The invention relates to a self-tuning wireless power supply system based on an LLC topological structure, which comprises a primary side circuit and a secondary side circuit, wherein the primary side circuit comprises a direct-current voltage source, an inverter circuit and a primary side resonance circuit connected with a primary side compensation capacitor in series; and introducing a feedback loop, wherein the feedback loop takes the secondary current of the secondary circuit as a feedback quantity, extracts zero point information of the secondary current by using an I/V converter and a zero crossing comparator, transmits the zero point information to a primary circuit by using wireless transmission for receiving, and transmits the received wireless signal to a controller to analyze the relation between the working frequency of the circuit and the resonant frequency so as to control a half-bridge driving chip to adjust the working frequency of the inverter circuit.
Description
Technical Field
The invention belongs to the field of wireless power supply, and particularly relates to a wireless power supply system capable of automatically tuning in a remote measuring system.
Background
The telemetry system provides an effective mode for testing the performance of high-speed rotating equipment, and for the special working condition of high-speed rotation, stable and reliable power supply is one of the keys of the telemetry technology. Wireless power supply technology abandons the traditional power supply technology of physical connection, so wireless power supply is usually selected as a power supply mode in a high-speed rotating body telemetry system.
The current wireless power supply technologies mainly include an electromagnetic induction type, a magnetic resonance type, a radio wave type and an electric field coupling type. Currently the most mature and common are the electromagnetic induction types. The electromagnetic induction type wireless power supply technology utilizes the electromagnetic induction principle, alternating current is conducted on a primary coil of a sending end, and an induced current is generated by a secondary coil of an electromagnetic induction receiving end, so that wireless transmission of electric energy is realized. The electromagnetic induction type wireless power supply technology has high conversion efficiency, but has short transmission distance, so the electromagnetic induction type wireless power supply technology is more suitable for a remote measuring system with short-distance transmission. Because the test environment is narrow, the existing wireless power supply system of the rotating body telemetering instrument tends to select a smaller coil for coupling power supply, so that the coupling degree between the primary coil and the secondary coil is lower, higher resonant frequency and input voltage need to be set to ensure sufficient transmission efficiency, the more serious heating problem of the primary coil is brought, and the switching loss is not negligible due to the high voltage and the resonant frequency. Meanwhile, since the rotating body telemetry system is in a high-speed rotating state, the rotating process may introduce a change in transmission distance to change the resonant frequency of the wireless power supply circuit, thereby causing a change in voltage gain, and therefore it is necessary to design a wireless power supply technology capable of tracking the resonant frequency to stabilize the voltage gain.
Disclosure of Invention
The invention aims to provide a wireless power supply circuit with high power supply efficiency. The invention can realize automatic tracking of the resonant frequency of the circuit according to the change of the circuit parameters, and stabilize and maximize the voltage gain. The technical scheme is as follows:
a self-tuning wireless power supply system based on LLC topological structure comprises a primary circuit and a secondary circuit, wherein the primary circuit comprises a direct current voltage source, an inverter circuit and a primary resonant circuit connected in series with a primary compensation capacitor, the secondary circuit comprises a secondary compensation circuit connected in series with a secondary compensation capacitor, the secondary compensation circuit is connected into a full-bridge rectifier filter circuit to output direct current voltage to drive a load,
a feedback loop is introduced into an LLC topology wireless power supply circuit, secondary current of a secondary circuit is used as feedback quantity in the feedback loop, zero point information of the secondary current is extracted by an I/V converter and a zero crossing comparator, the zero point information is transmitted to a primary circuit for receiving by wireless transmission, the primary circuit receives a wireless signal and then sends the wireless signal to a controller to analyze the relation between the working frequency and the resonant frequency of the circuit, and further a half-bridge driving chip is controlled to adjust the working frequency of an inverter circuit, and the control method comprises the following steps: and when the error control quantity is zero, tracking the resonant frequency is realized.
Drawings
Fig. 1 shows the overall structure of the present invention.
In fig. 1: 1 is a direct current power supply; 2 is an inverter bridge circuit; 3 is a resonant circuit; 4, a transformer wireless power supply module; 5 is a secondary side compensation circuit; 6 is a rectifying and filtering circuit; 7 is a load; and 8 is a feedback loop.
Fig. 2 shows the basic topology of the LLC resonant circuit of the invention.
In fig. 2: 1 is a direct current power supply; 2 is an inverter bridge circuit; 3 is a resonant circuit; 4, a transformer wireless power supply module; 5 is a secondary side compensation circuit; 6 is a rectifying and filtering circuit; 7 is a load; 8 is a feedback loop; 9. 10 is a power switch tube; 11 is a primary side compensation capacitor; 12 is the primary side leakage inductance of the transformer; 13 is transformer excitation inductance; 14 is transformer secondary leakage inductance; 15 is a secondary side compensation capacitor; 16 is an I/V converter; 17 is a zero-crossing comparator; 18 is a microcontroller; 19 is a half-bridge driver chip; 20 is the secondary current; 21 is a primary coil; and 22 is a secondary coil.
Detailed Description
The LLC topological structure is a common transformer structure, and the working efficiency of the transformer is improved by compensating the primary side leakage inductance through the compensation capacitor. The invention further improves the working efficiency of the circuit structure by introducing the complex-side compensation capacitor to compensate the secondary side leakage inductance. Meanwhile, a feedback loop is introduced, and the transformer circuit structure is developed into a wireless power supply technology capable of tracking the resonant frequency.
The circuit structure of the invention is shown in figure 1 and comprises a direct current power supply 1, an inverter bridge circuit 2, a resonance circuit 3, a wireless power supply module 4, a secondary side compensation circuit 5, a rectification filter circuit 6, a load 7 and a feedback loop 8.
When the circuit works, the direct current power supply 1 obtains square wave output through the inverter circuit 2, and the square wave frequency can be controlled by adjusting the switching frequency of the mos tubes 9 and 10. The square wave signal passes through the resonant circuit to obtain a sinusoidal harmonic component closest to the resonant frequency.
The structure of the resonant circuit 3 can be obtained from fig. 2, and the resonant circuit is composed of a primary side compensation capacitor 11, a primary side leakage inductor 12 and an excitation inductor 13. Setting primary side leakage inductance as LrPrimary side compensation capacitor is CrExcitation inductance of LmThe resonant circuit then has two resonant frequencies fr1And fr2(fr1＞fr2) (ii) a When the primary side exciting inductor 13 is clamped by the output voltage (the output voltage is independent of the resonant frequency), the resonant frequency is
When the exciting inductor 13 is not clamped by the output voltage, the resonant frequency is
To obtain a stable voltage gain, the voltage of the exciting inductor 13 needs to be operated in a clamping state, i.e. at an operating frequency fr1At this time, the primary side leakage inductor 12 and the primary side compensation capacitor 11 resonate, and at this time, the voltage gain and the resonant frequency fr1Is irrelevant to the size of the device. Because f isr1＞fr2So that the resonant circuit is inductive at this timeThe current lags behind the voltage, zero voltage switching-on (ZVS) of the mos tube is realized, switching loss of the mos tube is reduced, and working efficiency of the circuit is further improved.
And adjusting the switching frequency of the mos tube switches 9 and 10 to be equal to the resonance frequency, and obtaining a sine wave with the resonance frequency by the square wave signal passing through the resonance circuit 3. The sine wave signal transmits the primary voltage to the secondary coil 22 through the wireless power supply module 4.
The invention adopts the same coil as the primary coil 21 and the secondary coil 22, so the primary leakage inductance 12 is the same as the secondary leakage inductance 14, the secondary compensation capacitor 15 which is the same as the primary compensation capacitor 11 is used for forming a secondary compensation circuit, and the working frequency of the secondary voltage meets the resonant frequency of the secondary leakage inductance 14 and the secondary compensation capacitor 15
The secondary side compensation circuit thus stabilizes the voltage gain of the secondary side.
The secondary side voltage is output to a secondary side load 7 through a direct current voltage obtained by the rectifying and filtering circuit 6 to provide power voltage.
When the wireless power supply system works, the distance between the secondary winding and the primary winding is inevitably changed, so that the leakage inductances 12 and 14 are also changed, and the resonant frequency f is also changedr1And therefore the resonant frequency needs to be tracked in order to stabilize the circuit gain.
When the circuit is operated at the resonance frequency fr1When the secondary current is in phase with the primary voltage, the circuit operating frequency is higher than the resonance frequency fr1When the secondary current phase lags the primary voltage phase, the circuit operating frequency is higher than the resonance frequency fr1The secondary current phase leads the primary voltage phase. Therefore, the relation between the working frequency and the resonant frequency can be judged by comparing the zero phase time of the secondary side current with the zero phase time of the mos tube voltage control signal.
In order to realize the tracking of the resonant frequency, the invention introduces a feedback loop.
The specific implementation mode is that the secondary side current 20 is used as the feedback quantity inputThe I/V converter 16 converts the secondary side current signal 20 into a voltage signal for processing, inputs the voltage signal into the zero-crossing comparator 17 to extract zero point information, inputs the zero point information into the microcontroller 18 for analysis and processing, and further controls the half-bridge driving chip 19 to adjust the switching frequency of the mos tubes 9 and 10 so as to realize the resonance frequency fr1The tracking of (2).
In particular, the control parameters may be adjusted such that the operating frequency f satisfies fr2＜f＜fr1At the moment, the primary side resonance circuit is inductive, and the secondary side compensation circuit is capacitive, so that zero voltage conduction (ZVS) of the primary side mos tube and zero current turn-off (ZCS) of the secondary side rectifier tube can be realized, the switching loss is further reduced, and the overall efficiency of the circuit is improved.
Claims (1)
1. A self-tuning wireless power supply system based on LLC topological structure comprises a primary circuit and a secondary circuit, wherein the primary circuit comprises a direct current voltage source, an inverter circuit and a primary resonant circuit connected in series with a primary compensation capacitor, the secondary circuit comprises a secondary compensation circuit connected in series with a secondary compensation capacitor, the secondary compensation circuit is connected into a full-bridge rectifier filter circuit to output direct current voltage to drive a load,
a self-tuning wireless power supply system introduces a feedback loop, the feedback loop takes the secondary current of a secondary circuit as feedback quantity, an I/V converter and a zero crossing comparator are utilized to extract zero point information of the secondary current, the zero point information is transmitted to a primary circuit for receiving by wireless transmission, the primary circuit receives a wireless signal and then sends the wireless signal to a controller to analyze the relation between the working frequency and the resonant frequency of the circuit, and further a half-bridge driving chip is controlled to adjust the working frequency of an inverter circuit, and the control method comprises the following steps: and when the error control quantity is zero, tracking the resonant frequency is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910967515.1A CN110676948A (en) | 2019-10-12 | 2019-10-12 | Wireless power supply circuit based on LLC topological structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910967515.1A CN110676948A (en) | 2019-10-12 | 2019-10-12 | Wireless power supply circuit based on LLC topological structure |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522900A (en) * | 2011-11-18 | 2012-06-27 | 南京航空航天大学 | Fixed-gain self-excited non-contact resonant converter and control method thereof |
| CN104935090A (en) * | 2015-07-15 | 2015-09-23 | 中南大学 | Electric energy and signal synchronous transmission method based on frequency splitting in electric energy wireless transmission |
| CN110176811A (en) * | 2019-05-31 | 2019-08-27 | 天津大学 | Numerically controlled self-resonance, super-silent wireless power supply system |
| CN211151627U (en) * | 2019-09-06 | 2020-07-31 | 天津大学 | Wireless power supply circuit based on LL C topological structure |
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2019
- 2019-10-12 CN CN201910967515.1A patent/CN110676948A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522900A (en) * | 2011-11-18 | 2012-06-27 | 南京航空航天大学 | Fixed-gain self-excited non-contact resonant converter and control method thereof |
| CN104935090A (en) * | 2015-07-15 | 2015-09-23 | 中南大学 | Electric energy and signal synchronous transmission method based on frequency splitting in electric energy wireless transmission |
| CN110176811A (en) * | 2019-05-31 | 2019-08-27 | 天津大学 | Numerically controlled self-resonance, super-silent wireless power supply system |
| CN211151627U (en) * | 2019-09-06 | 2020-07-31 | 天津大学 | Wireless power supply circuit based on LL C topological structure |
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