CN105024738A - Shared-channel-based energy signal parallel transmission system - Google Patents
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Abstract
The invention discloses a shared-channel-based energy signal parallel transmission system. The system comprises an energy input device, a primary-side electric energy conversion device, an energy coupling mechanism, a secondary-side electric energy conversion device and a load; and the energy coupling mechanism is composed of a transmitting coil L<p> and a pick-up coil L<s>. The system is characterized in that a primary-side signal transmission channel is connected to two ends of the transmitting coil L<p> in parallel, a secondary-side signal transmission channel is connected to two ends of the pick-up coil L<s> in parallel, a primary-side high-frequency trap circuit is connected, in series, to an energy transmission channel between the primary-side electric energy conversion device and a primary-side signal loading circuit, and a secondary-side high-frequency trap circuit is connected, in series, to the secondary-side electric energy conversion device and a secondary-side signal loading circuit. The system is not additionally provided with a signal coupling mechanism, the signal transmission channel is directly connected to the energy coupling mechanism in parallel, energy transmission and signal transmission are simultaneously achieved by utilizing the energy coupling mechanism, and high-frequency wave trappers are adopted so that the signal transmission cannot influence energy transmission performance of the system.
Description
Technical field
The present invention relates to inductively coupled power transfer technology, particularly relate to a kind of energy signal parallel transmission system based on sharing channel.
Background technology
Inductively coupled power transfer (IPT) technology is a kind of by coupled magnetic field, realizes the new electric energy access technology of electric energy contactless transmission.Because the receiving terminal that the transmitting terminal of energy is co-energy does not have direct physical contact, overcome the many disadvantages of traditional delivery of electrical energy, make the feature that the transmitting procedure of electric energy has safely, reliable and flexibility is strong, receive increasing concern.Achieve actual application and success in fields such as electric automobile, biological doctor electricity, household electrical appliance, robots at present.
Traditional IPT technology mainly concentrates on the optimal design of the aspects such as Energy Transfer grade, efficiency, circuit topology and coupled structure to system.Along with multi-energy transmitting terminal, pickup end, the appearance of the application demands such as energy two-way transmission, needs the running status according to energy transmitting terminal and energy acceptance end, controls in real time; Meanwhile, for the application of sensing network, also need the transmission of the detection signal realizing transducer, this just needs whole IPT system to have the signal transmission system parallel with energy transmission system.Stable, reliable, the easy signal transmission how realized between IPT system capacity transmitting terminal and receiving terminal also becomes and realizes IPT technology application institute problem demanding prompt solution.
At present, for the energy transmitting terminal of IPT system and the communication issue of receiving terminal, widely using is by newly-increased Signal transmissions coil, realizes the parallel transmission of energy and signal.Although solve the demand that energy transmitting terminal communicates with receiving terminal to a certain extent, but newly-increased communication interface adds the destabilizing factor of whole system, and mutual cross-interference issue between the two have impact on performance and the robustness of whole system simultaneously.
There is scholar to propose to be connected in series coupling transformer in energy transmission loop, high-frequency carrier signal is coupled in energy loop, realizes the transmission of digital signal carrier wave.The introducing of high-frequency signal carrier wave can bring harmonic wave disturb in energy loop, reduces Energy Transfer quality, and transmits the existence of loop resonance compensating circuit due to system capacity, and signal carrier can weakenedly be difficult to pass through smoothly.
Chinese patent 201410016053.2 also discloses a kind of wireless energy based on multi-resonant technology and signal synchronous transmission system, this system is the impact of transmitting energy by amplitude modulation(PAM) of synchronization transfer method in order to solve existing energy and signal, can not obtain the problem of stable power stage.It has the LC series-parallel circuit of multiple resonance point as former/secondary resonant matching circuit, making Energy Transfer use different frequencies respectively with communicating, while realizing energy and data synchronization transmissions, influencing each other of the two being minimized.But the signal transmission passage in this system is connected in parallel on outside the LC resonance compensation circuit of Energy Coupling mechanism L and resonant capacitance C formation, the signal of transmission has to pass through resonant capacitance, still more serious on the impact of signal, simultaneously during Energy Transfer, also can in some entering signal transmission channel, along with the increasing of system capacity through-put power, the ER effect that signal extraction coil bears is large, Energy Transfer increases the interference of signal receiving, affects the demodulation of signal.
Summary of the invention
For the defect of prior art, the present invention proposes a kind of energy signal parallel transmission system based on sharing channel, by signal loading and detector circuit in parallel with energy coupling structure, utilize the band of LC to lead to and enter energy transmission loop with band-stop response disabling signal carrier wave, and block Energy Transfer entering signal transmission channel, erasure signal carrier transmission is in the humorous wave interference in energy loop, reduce the impact of Energy Transfer on Signal transmissions, do not affecting on the basis of Energy Transfer, realizing the transmitted in both directions of signal.
In order to achieve the above object, concrete technical scheme of the present invention is as follows:
Based on an energy signal parallel transmission system for sharing channel, comprise energy input devices, former limit electrical energy changer, Energy Coupling mechanism, secondary electrical energy changer and load, described Energy Coupling mechanism is by transmitting coil L
pwith pick-up winding L
sform, between Energy Coupling mechanism and former limit electrical energy changer, be provided with former limit resonance compensation circuit, its key is: at described transmitting coil L
ptwo ends be parallel with former limit signal transmission passage, at described pick-up winding L
stwo ends be parallel with secondary side signal transmission channel, described former limit signal transmission passage is by coupling transformer T
1a winding, tuning capacitance C
1and coupling transformer T
3a windings in series form, described coupling transformer T
1as former limit signal loading circuit, its another winding loads the signal sent to secondary, described coupling transformer T
3as former limit picking up signal element, its another winding parallel detection electric capacity C
3the former frontier inspection wave circuit of rear formation, described secondary side signal transmission channel is by coupling transformer T
2a winding, tuning capacitance C
2and coupling transformer T
4a windings in series form, described coupling transformer T
2as secondary side signal loaded circuit, its another winding loads the signal sent to former limit, described coupling transformer T
4as secondary side signal pickup device, its another winding parallel detection electric capacity C
4rear formation secondary detecting circuit, energy-transmission channel between described former limit electrical energy changer and described former limit signal loading circuit is serially connected with former limit high-frequency choke circuit, the energy-transmission channel between described secondary electrical energy changer and described secondary side signal loaded circuit is serially connected with secondary high-frequency choke circuit.
As further describing, described former limit high-frequency choke circuit and described secondary high-frequency choke circuit are all by the rejector circuit of inductance, Capacitance parallel connection, and its centre frequency is signal(-) carrier frequency.
Further describe, the coupling transformer in described former limit signal transmission passage and secondary side signal transmission channel and tuning capacitance form a bandwidth-limited circuit respectively, and its centre frequency is signal(-) carrier frequency again.
For the ease of the modulation of digital signal realized, described former limit signal loading circuit and described secondary side signal loaded circuit are connected to one for loading the ON-OFF keying modulation module of digital signal, are carrier signal by on-off keying by digital signal modulated.
In order to ensure energy transmission efficiency, described former limit resonance compensation circuit is former limit resonant capacitance.
In like manner, be provided with secondary resonance compensation circuit between Energy Coupling mechanism and secondary electrical energy changer, this secondary resonance compensation circuit is secondary resonant capacitance.Certainly, if the coupling coefficient of Energy Coupling mechanism is higher, secondary resonant capacitance also can omit.
Remarkable result of the present invention is:
A kind of energy signal parallel transmission system based on sharing channel that the present invention proposes, do not need additionally to increase signal coupling mechanism, in the existing Energy Coupling mechanism of system that signal transmission passage is directly parallel in, middle not resonance compensation electric capacity, and to have connected high-frequency choke circuit at signal transmission passage and energy changing device, according to the impedance operator of high-frequency choke circuit parallel resonance, resonance frequency is regulated to equal signal(-) carrier frequency, its characteristic impedance is concerning enough large signal carrier like this, be equivalent to open circuit, resonant capacitance in signal loading circuit in signal transmission passage and the co-energy transmission channel of signal demodulator circuit can block by high-frequency choke circuit, signal carrier can not pass through resonant capacitance again, but directly pass through coupling mechanism, attenuation can not be caused to signal carrier.Secondly, in signal loading circuit and detecting circuit, the windings in series that tuning capacitance and coupling become, only need to regulate its resonance frequency to equal the frequency of signal carrier, according to the impedance operator of series resonance, its characteristic impedance is minimum under signal carrier, signal carrier can pass through smoothly, and for energy frequency, its impedance is but quite large, like this for energy, is equivalent to open circuit, this branch road can't impact the transmission of energy, can the noiseless parallel transmission of experiment energy signal truly.Secondly, when the frequency of energy changes within the specific limits, its impedance is still enough large, can ensure the Sofe Switch mode of operation of energy.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is the circuit theory diagrams after increasing high-frequency choke circuit in Traditional IP T system;
Fig. 3 is the circuit theory diagrams of signal transmission passage;
The Bode figure of system capacity transmission when Fig. 4 is no signal transmission channel;
Fig. 5 is the Bode figure of system capacity transmission when having signal transmission passage;
Fig. 6 is that Energy Transfer is schemed the Bode that affects that signal forward transmits;
Fig. 7 is that Energy Transfer is schemed the Bode that affects that signals reverse is transmitted;
Fig. 8 is the Bode figure of Signal transmissions;
Fig. 9 is digital signal modulated design sketch;
Figure 10 is the theory diagram of signal demodulating circuit.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention and operation principle are described in further detail.
As shown in Figure 1-Figure 3, a kind of energy signal parallel transmission system based on sharing channel, comprise energy input devices, former limit electrical energy changer, Energy Coupling mechanism, secondary electrical energy changer and load, described Energy Coupling mechanism is by transmitting coil L
pwith pick-up winding L
sform, between Energy Coupling mechanism and former limit electrical energy changer, be provided with former limit resonance compensation circuit, it is characterized in that: at described transmitting coil L
ptwo ends be parallel with former limit signal transmission passage, at described pick-up winding L
stwo ends be parallel with secondary side signal transmission channel, described former limit signal transmission passage is by coupling transformer T
1a winding, tuning capacitance C
1and coupling transformer T
3a windings in series form, described coupling transformer T
1as former limit signal loading circuit, its another winding loads the signal sent to secondary, described coupling transformer T
3as former limit picking up signal element, its another winding parallel detection electric capacity C
3the former frontier inspection wave circuit of rear formation, described secondary side signal transmission channel is by coupling transformer T
2a winding, tuning capacitance C
2and coupling transformer T
4a windings in series form, described coupling transformer T
2as secondary side signal loaded circuit, its another winding loads the signal sent to former limit, described coupling transformer T
4as secondary side signal pickup device, its another winding parallel detection electric capacity C
4rear formation secondary detecting circuit, energy-transmission channel between described former limit electrical energy changer and described former limit signal loading circuit is serially connected with former limit high-frequency choke circuit, the energy-transmission channel between described secondary electrical energy changer and described secondary side signal loaded circuit is serially connected with secondary high-frequency choke circuit.
As seen in Figure 3, described former limit high-frequency choke circuit and described secondary high-frequency choke circuit are all by the rejector circuit of inductance, Capacitance parallel connection, its centre frequency is signal(-) carrier frequency, coupling transformer in described former limit signal transmission passage and secondary side signal transmission channel and tuning capacitance form a bandwidth-limited circuit respectively, its centre frequency is signal(-) carrier frequency, described former limit resonance compensation circuit is former limit resonant capacitance, because the coupling coefficient of Energy Coupling mechanism is higher, secondary resonant capacitance is not set in this example.
In order to understand the performance of native system further, below on the by-pass channel added on the impact of Energy Transfer, and the impact of energy transport on signals transmission is analyzed, when specifically implementing, the mark of each element in composition graphs 2, Fig. 3, system parameters is as shown in table 1.
Table 1 system parameters
First the impact added system capacity transmitting procedure of analytic signal transmission channel, when for adding signal transmission passage, as shown in Figure 2, supposing the system inverter output voltage is V to system configuration
in, system equivalent load is R
e, system load terminal voltage is V
out, resonance frequency is ω, ignores the impact of high-frequency choke circuit on system impedance, then energy pickup terminal impedance is: z
2=j ω L
s+ R
s+ R
e;
Its reflected umpedance is:
Then the impedance of energy transmitting terminal is:
Then the electric current of energy transmitting terminal is:
The voltage that energy pickup end picks up is: v
2=j ω Mi
1;
The load output voltage that can obtain system is:
Then can obtain the gain that system capacity is input to load end is:
After adding by-pass channel, the impedance of energy pickup end is:
Z
simpedance for by-pass channel:
Z
42for detection is at the reflected umpedance of channel:
By the symmetry of channel, transmitting terminal channel impedance z
p'=z
s', the reflected umpedance of energy pickup end is z
21', the impedance of energy transmitting terminal is:
Then the electric current of energy transmitting terminal is:
Then the terminal voltage of energy transmitting terminal is:
The electric current then flowing through Energy Coupling mechanism is:
Can obtain energy pickup terminal voltage is: v
2'=j ω Mi
1';
Then the voltage of load end is:
Similarly, after can obtaining adding signal transmission passage, system capacity is input to the gain of output, obtain the Bode diagram of system capacity transmission in two kinds of situations, be respectively shown in Fig. 4 and Fig. 5, the Bode diagram relatively loading Energy Transfer before and after by-pass channel is known, at low frequency section (lower than 1000kHz), the gain under the trend of Bode diagram and corresponding frequencies, phase place are almost consistent, and known by-pass channel almost can be ignored for the impact of system capacity transmitting procedure.
Next our analysing energy transmits the impact on the transmission of signal forward, and as shown in Figure 3, signal forward transmitting procedure is by coupling transformer T
1injection Signal carrier wave, T
4from channel, extract signal carrier, energy high-frequency harmonic may seal in channel, affects the demodulation of signal.Here set up system inversion and export the relation exported with signal demodulator circuit, the impact that certainty annuity Energy Transfer transmits signal forward.
Energy pickup terminal voltage is v
2'=j ω Mi
1', then the electric current of channel is:
The output voltage of signal demodulator is: V
out1'=j ω M
3i
s;
Then can obtain signal demodulator output voltage V
out1same V
inbode diagram as shown in Figure 6.
Bode diagram energy inputted by Fig. 6 signal demodulator, during the transmission of signal forward, high-frequency electrical energy can reach-95.5dB to the gain of signal receiving end detecting circuit, energy transport in the interference of signals transmission by very large weakening; Even if still can-39.3dB be reached for its high order harmonic component (higher than 1.48MHz) its gain, minimum in the interference of signal demodulator circuit.Select suitable signal carrier, the signal carrier amplitude V that signal demodulator is obtained
out1be greater than the interference V of Energy Transfer at signal carrier circuit
out1', Energy Transfer also can be ignored the impact that signal forward transmits.
Next we analysing energy transmission is on the impact of signals reverse transmission again, during signals reverse transmission, interference is main from coupling transformer T
3be coupled to from high-frequency electrical energy harmonic wave.By the terminal voltage of energy transmitting terminal be:
the electric current of known transmitting terminal channel is:
Then the terminal voltage of signal demodulator circuit is: V
out2'=j ω M
3i
t';
Then V can be obtained
out2'-V
inbode diagram, be illustrated in fig. 7 shown below.
In signals reverse transmitting procedure, the gain of high-frequency electrical energy in signal receiving circuit can reach-85.7dB, Energy Transfer on the impact of signals transmission by very large weakening, the gain of its high order harmonic component (higher than 1.32MHz) also reaches-27.1dB, and the impact that Energy Transfer transmits system signal is also very little.
In signals transmission, high-frequency choke circuit disabling signal carrier wave enters energy transmission loop, and energy transmission loop is equivalent to short circuit for signal carrier.The symmetry of channel, is only introduced the attenuation of signal forward transmitting procedure signal carrier here.Carrier wave is input as V
in1, detection exports as V
out1, obtain its Bode diagram curve as shown in Figure 8.
Known by analysis chart 8, signal carrier is in transmission process, and gain has three peak values, and when frequency is 1.48MHz, gain reaches 5.89dB.In conjunction with the Bode diagram that, Energy Transfer affects Signal transmissions, select suitable signal(-) carrier frequency, realize the transmitted in both directions of signal carrier, the impact of Energy Transfer simultaneously drops to minimum, realizes the real-time synchronization transmission of energy signal.
In order to better realize Signal transmissions, described former limit signal loading circuit and described secondary side signal loaded circuit are connected to one for loading the ON-OFF keying modulation module of digital signal.Signal loading adopts the modulation system of on-off keying OOK (On-Off-Keying), when digital signal is 1, export continuous print carrier wave, when digital signal is 0, closedown carrier wave exports, by the modulation of switching circuit settling signal, obtain the carrier signal with numerical characteristic at output, modulated process as shown in Figure 9.
From the complex carrier with digital carrier and energy harmonic wave that detecting circuit obtains, through band pass filter, select suitable comparator threshold, obtain digital carrier signal, through monostable trigger, restore digital signal, the demodulation of settling signal, its structure as shown in Figure 10.
In sum, the pattern of this sharing channel of the present invention's proposition realizes the energy signal real-time synchronization transmission of IPT system.Do not need additionally to increase signal coupling mechanism, signal loading and detecting circuit are connected in parallel in the existing Energy Coupling mechanism of system, achieve under the prerequisite of not influential system Energy Transfer, the one-way transmission of energy, the half-duplex bidirectional transmission of signal, by the channel in parallel with coupling coil, realize signal carrier and be injected into coupling coil, and signal carrier is extracted from coupling coil, Energy Transfer can be operated in Sofe Switch pattern, reduce the radiated interference to Signal transmissions, the impact of Signal transmissions can not be subject to simultaneously; The speed of Signal transmissions is minimum can reach 19.2Kbps, and is half-duplex, transmitted in both directions, its error rate can reach completely lower than ten thousand/ requirement, have great application prospect.
Claims (6)
1., based on an energy signal parallel transmission system for sharing channel, comprise energy input devices, former limit electrical energy changer, Energy Coupling mechanism, secondary electrical energy changer and load, described Energy Coupling mechanism is by transmitting coil L
pwith pick-up winding L
sform, between Energy Coupling mechanism and former limit electrical energy changer, be provided with former limit resonance compensation circuit, it is characterized in that: at described transmitting coil L
ptwo ends be parallel with former limit signal transmission passage, at described pick-up winding L
stwo ends be parallel with secondary side signal transmission channel, described former limit signal transmission passage is by coupling transformer T
1a winding, tuning capacitance C
1and coupling transformer T
3a windings in series form, described coupling transformer T
1as former limit signal loading circuit, its another winding loads the signal sent to secondary, described coupling transformer T
3as former limit picking up signal element, its another winding parallel detection electric capacity C
3the former frontier inspection wave circuit of rear formation, described secondary side signal transmission channel is by coupling transformer T
2a winding, tuning capacitance C
2and coupling transformer T
4a windings in series form, described coupling transformer T
2as secondary side signal loaded circuit, its another winding loads the signal sent to former limit, described coupling transformer T
4as secondary side signal pickup device, its another winding parallel detection electric capacity C
4rear formation secondary detecting circuit, energy-transmission channel between described former limit electrical energy changer and described former limit signal loading circuit is serially connected with former limit high-frequency choke circuit, the energy-transmission channel between described secondary electrical energy changer and described secondary side signal loaded circuit is serially connected with secondary high-frequency choke circuit.
2. the energy signal parallel transmission system based on sharing channel according to claim 1, it is characterized in that: described former limit high-frequency choke circuit and described secondary high-frequency choke circuit are all by the rejector circuit of inductance, Capacitance parallel connection, and its centre frequency is signal(-) carrier frequency.
3. the energy signal parallel transmission system based on sharing channel according to claim 1, it is characterized in that: the coupling transformer in described former limit signal transmission passage and secondary side signal transmission channel and tuning capacitance form a bandwidth-limited circuit respectively, and its centre frequency is signal(-) carrier frequency.
4. the energy signal parallel transmission system based on sharing channel according to claim 1-3 any one, is characterized in that: described former limit signal loading circuit and described secondary side signal loaded circuit are connected to one for loading the ON-OFF keying modulation module of digital signal.
5. the energy signal parallel transmission system based on sharing channel according to claim 1-3 any one, is characterized in that: described former limit resonance compensation circuit is former limit resonant capacitance.
6. the energy signal parallel transmission system based on sharing channel according to claim 5, it is characterized in that: between Energy Coupling mechanism and secondary electrical energy changer, be provided with secondary resonance compensation circuit, this secondary resonance compensation circuit is secondary resonant capacitance.
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Cited By (9)
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| CN105680577A (en) * | 2016-04-12 | 2016-06-15 | 中国矿业大学 | Wide-range power adjustable wireless electric energy transmission system and control method thereof |
| CN105846684A (en) * | 2016-03-23 | 2016-08-10 | 中国矿业大学 | Noncontact electric energy and signal synchronous transmission system and control method thereof |
| CN107592140A (en) * | 2017-07-13 | 2018-01-16 | 重庆大学 | ICPT bidirectional data transmission systems based on portion of energy coil |
| CN107612347A (en) * | 2017-09-29 | 2018-01-19 | 哈尔滨工业大学 | Wireless energy and data synchronization transmissions system based on bilateral LCC compensation |
| CN107749772A (en) * | 2017-12-04 | 2018-03-02 | 哈尔滨工业大学 | A kind of wireless energy synchronizing information Transmission system |
| CN108390472A (en) * | 2018-03-09 | 2018-08-10 | 中国矿业大学 | A kind of non-contact energy and signal synchronous transmission system and transmission method |
| CN110571875A (en) * | 2019-10-30 | 2019-12-13 | 广东电网有限责任公司 | Uninterrupted wireless power supply device |
| CN112701800A (en) * | 2021-01-19 | 2021-04-23 | 重庆大学 | Shared channel type single-capacitor coupling wireless electric energy and signal parallel transmission system |
| CN112713666A (en) * | 2021-01-13 | 2021-04-27 | 重庆大学 | Double-frequency double-load multi-relay MC-WPT system based on shared energy channel |
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| CN105846684B (en) * | 2016-03-23 | 2018-02-23 | 中国矿业大学 | A kind of non-contact electric energy and signal synchronous transmission system and its control method |
| CN105680577A (en) * | 2016-04-12 | 2016-06-15 | 中国矿业大学 | Wide-range power adjustable wireless electric energy transmission system and control method thereof |
| CN107592140A (en) * | 2017-07-13 | 2018-01-16 | 重庆大学 | ICPT bidirectional data transmission systems based on portion of energy coil |
| CN107612347A (en) * | 2017-09-29 | 2018-01-19 | 哈尔滨工业大学 | Wireless energy and data synchronization transmissions system based on bilateral LCC compensation |
| CN107749772B (en) * | 2017-12-04 | 2020-12-11 | 哈尔滨工业大学 | Wireless energy information synchronous transmission system |
| CN107749772A (en) * | 2017-12-04 | 2018-03-02 | 哈尔滨工业大学 | A kind of wireless energy synchronizing information Transmission system |
| CN108390472A (en) * | 2018-03-09 | 2018-08-10 | 中国矿业大学 | A kind of non-contact energy and signal synchronous transmission system and transmission method |
| CN108390472B (en) * | 2018-03-09 | 2021-07-16 | 中国矿业大学 | Non-contact energy and signal synchronous transmission system and transmission method |
| CN110571875A (en) * | 2019-10-30 | 2019-12-13 | 广东电网有限责任公司 | Uninterrupted wireless power supply device |
| CN112713666A (en) * | 2021-01-13 | 2021-04-27 | 重庆大学 | Double-frequency double-load multi-relay MC-WPT system based on shared energy channel |
| CN112713666B (en) * | 2021-01-13 | 2023-08-18 | 重庆大学 | Dual-frequency dual-load multi-relay MC-WPT system based on shared energy channel |
| CN112701800A (en) * | 2021-01-19 | 2021-04-23 | 重庆大学 | Shared channel type single-capacitor coupling wireless electric energy and signal parallel transmission system |
| CN112701800B (en) * | 2021-01-19 | 2022-11-01 | 重庆大学 | Shared channel type single-capacitor coupling wireless electric energy and signal parallel transmission system |
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