CN201742175U - Power control circuit used for contactless energy transmission system - Google Patents
Power control circuit used for contactless energy transmission system Download PDFInfo
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- CN201742175U CN201742175U CN2010202779101U CN201020277910U CN201742175U CN 201742175 U CN201742175 U CN 201742175U CN 2010202779101 U CN2010202779101 U CN 2010202779101U CN 201020277910 U CN201020277910 U CN 201020277910U CN 201742175 U CN201742175 U CN 201742175U
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Abstract
The utility model discloses a power control circuit which is used for contactless energy transmission system, comprising a DC power, an inverter, an original side resonant circuit, a vice side resonant circuit, a rectifier filter circuit as well as a variable load. The power control circuit is characterized in that a voltage detection unit is connected on the variable load, and the voltage detection unit is connected with a voltage comparing unit by an RF transmitter and an RF receiver. The voltage comparing unit is also connected with the standard reference voltage, the output end thereof is connected with a soft switch operating point select unit, the soft switch operating point select unit is connected with a signal frequency unit, the signal frequency unit is connected with a driving circuit to drive a switch tube in the inverter. The utility model has the remarkable effects: the structure of a main circuit is simple, any additional switch circuit need not be added into the main circuit, thereby the control difficulty of the system is decreased, the switch tube in the inverter is always in a soft switch mode, the switch loss is decreased, the conversion efficiency of the system is improved, thereby the effective adjustment of transmission power is realized.
Description
Technical field
The utility model relates to contactless energy transmission technology field, specifically, is a kind of power control circuit that is used for contactless energy transmission system.
Background technology
Along with science and technology development, contactless power transfer has been widely applied to fields such as electric power transfer and automatic control.And in contactless energy transmission system, its former limit and secondary are two independent sectors of complete electric insulation, the power termination that is connected on the secondary tends to change, realize the adjusting and the control of system transmissions power, usually also be to take measures respectively from former limit and secondary, at present common power control mainly contains following several:
(1) former limit or secondary series connection DC/DC converter (being dc-dc conversion)
By adding the DC/DC link on the former limit of system, adjust the input voltage of high-frequency inverter, thus the through-put power of regulating system.Also can go into the DC/DC converter picking up termination, realize the local voltage stabilizing control of secondary, to adapt to different loads.
(2) former limit or secondary off resonance control
Insert switching capacity or phased inductance in the resonant tank of former limit or secondary, adjust its equivalent capacitance value or inductance value, the system that makes is in tuning state or nonresonant state, thus the through-put power of regulating system or the power that picks up.
(3) secondary short circuit decoupling zero control
By pick up end one group of decoupling coil in parallel or on pick-up winding short switch in parallel, pick up the end decoupling zero with certain frequency and duty ratio control and just can regulate the power that picks up.
(4) former limit phase shifting control
Former limit high-frequency inverter is adopted phase shifting control, regulate the energy that injects former limit resonant network by the size of regulating phase shifting angle, thus the through-put power of regulating system;
(5) former limit energy injection control
This method is mainly used in the contactless energy transmission system of voltage-type series resonance, when the resonance current zero passage of each former limit, controller is determined resonant network is connected to power supply to inject energy according to feedback error signal, still allows the resonant network free oscillation.This is a kind of discrete control mode, and the minimum time unit that each energy injects is half cycle of oscillation.
All exist not enough in existing these control modes, above-mentioned 1,2,3 kind of control mode all need insert the switch auxiliary circuit in system's main circuit, this has increased the cost of system and the difficulty of control on the one hand, has also reduced the efficient of system on the other hand to some extent.The 4th kind of phase-shifting control method can make the switching tube of former limit inverter be operated in the hard switching pattern, and when through-put power was big, this can increase the switching loss and the electromagnetic interference EMI value of system.And the 5th kind of energy injection control method be under light load condition, and the frequency that energy injects will decline to a great extent, and this can cause the envelope of resonance potential current waveform to have very big ripple, unstable properties.
The utility model content
The purpose of this utility model is to propose a kind of power control circuit that is used for contactless energy transmission system, is used for solving prior art circuit control complexity, and control efficiency is low, defectives such as unstable properties.
For achieving the above object, the utility model adopts following scheme:
A kind of power control circuit that is used for contactless energy transmission system, comprise DC power supply, inverter, former limit resonant circuit, secondary resonant circuit, current rectifying and wave filtering circuit and variable load, described inverter is the bridge inverter main circuit that first switching tube, second switch pipe, the 3rd switching tube and the 4th switching tube are formed;
Its key is: the high level end of described variable load is connected with voltage detection unit, the output of this voltage detection unit is connected with the RF transmitter, this RF transmitter and the wireless connections of RF receiver, the output of described RF receiver is connected with the first input end of voltage comparison unit, second input of this voltage comparison unit also is connected with canonical reference voltage, the output of this voltage comparison unit is connected with soft switch working point selected cell, the output of this soft switch working point selected cell is connected with the signal frequency split unit, the output of this signal frequency split unit is connected with drive circuit, and 4 tunnel drive signals of this drive circuit output are connected to described first switching tube, the second switch pipe, on the drive end of the 3rd switching tube and the 4th switching tube.
Described DC power supply, inverter, former limit resonant circuit, secondary resonant circuit, current rectifying and wave filtering circuit and variable load are formed a traditional contactless energy transmission system, produce the magnetic field coupling between excitation coil in the resonant circuit of former limit and the pick-up winding in the secondary resonant circuit, realized the contactless power transfer of former limit to secondary.
Because the resistance of different applied environment variable loads can change, cause the reflected umpedance of system to change, thereby cause the change of system transmissions power.The utility model is by being provided with the output voltage that voltage detection unit detects described variable load, and utilize ripe RF radio-frequency technique to be wirelessly transmitted to detected voltage data on the RF receiver that is arranged on former limit by the RF transmitter, described RF receiver is sent to the voltage data that receives in the voltage comparison unit, this voltage comparison unit compares voltage data and the canonical reference voltage that receives, and comparative result is sent to soft switch working point selected cell, described soft switch working point selected cell according to the comparative result that receives can the conditioning signal frequency unit divide ratio, the divide ratio that described signal frequency split unit receives, can the output frequency division signal according to the fundamental frequency signal that is connected the fundamental frequency input, this fractional frequency signal is input in the drive circuit, because this drive circuit is used for driving described inverter switching tube, so the frequency of fractional frequency signal is the break-make frequency of switching tube.
In Circuits System, secondary load output voltage is fed back in the control circuit on former limit, determine the break-make frequency of switching tube in the inverter of former limit according to the size of load output voltage canonical reference magnitude of voltage by the RF wireless transmission.If the comparative result of voltage comparison unit represents then that greater than zero output voltage is on the low side, system will increase the break-make frequency of switching tube in the inverter; If comparative result represents then that less than zero output voltage is higher, system will reduce the break-make frequency of switching tube in the inverter; If comparative result equals zero, then remain on the present operating point and move.
Switch back and forth between a plurality of soft switches working point by system feedback information, even load changes, the output voltage of its load end also can reach dynamic stability on the canonical reference electrical voltage point, thereby realizes the control to through-put power.
Be connected with current detecting unit on the resonant circuit of described former limit, the output of this current detecting unit is connected with the fundamental frequency signal input of described signal frequency split unit.
The fundamental frequency signal of described signal frequency split unit is the zero cross signal of inverter output current, and according to the divide ratio that receives, the signal frequency split unit carries out frequency division to fundamental frequency signal, and its output signal is directly controlled switching tube in the inverter bridge through overdrive circuit.
Described current rectifying and wave filtering circuit is made up of first diode, second diode, the 3rd diode, the 4th diode and low-pass filtering electric capacity, wherein first diode, second diode, the 3rd diode and the 4th diode are formed bridge rectifier, connect described secondary resonant circuit between two inputs of this bridge rectifier, connect described low-pass filtering electric capacity between two output ends of this bridge rectifier, connect described variable load at the two ends of low-pass filtering electric capacity.
The alternating current that bridge rectifier is picked up the secondary resonant circuit is shaped as direct current output, and the high frequency noise signal that produces in the system has reduced the electromagnetic interference of system through the filtering of low-pass filtering electric capacity.
Described former limit resonant circuit is the tandem resonant tank that resonant inductance becomes with the resonance capacitance group with the secondary resonant circuit.Adopting the advantage of series resonant circuit is exactly that its resonant tank does not exist DC channel, when system resonance is failed, circuit is in open-circuit condition rather than short-circuit condition, this can improve system reliability undoubtedly, the component parameters design is fairly simple in the series resonant tank simultaneously, be easy to realize all operating states of resonance of former secondary, reduced the difficulty of circuit design.
Remarkable result of the present utility model is: main circuit structure is simple, need not in main circuit, to add any extra switching circuit, reduced the control difficulty of system, and the switching tube in the inverter is in soft switching mode all the time, reduced switching loss, improve the conversion efficiency of system, realized effective adjusting of through-put power.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model;
Fig. 2 is the circuit theory diagrams of traditional contactless energy transmission system.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As shown in Figure 1: a kind of power control circuit that is used for contactless energy transmission system comprises DC power supply E
Dc, inverter 1, former limit resonant circuit L
p, C
p, secondary resonant circuit L
s, C
s, current rectifying and wave filtering circuit 2 and variable load R
L, described inverter 1 is the first switching tube S
1, second switch pipe S
2, the 3rd switching tube S
3And the 4th switching tube S
4The bridge inverter main circuit of forming, described former limit resonant circuit L
p, C
pBe by excitation coil L
pWith former limit resonant capacitance C
pThe tandem resonant tank of forming, described secondary resonant circuit L
s, C
sBe by pick-up winding L
sWith secondary resonant capacitance C
sThe tandem resonant tank of forming is at excitation coil L
pWith pick-up winding L
sBetween produce the magnetic field coupling, thereby realize the contactless power transfer of former limit to secondary.
Described variable load R
LThe high level end be connected with voltage detection unit 3, the output of this voltage detection unit 3 is connected with RF transmitter 4, this RF transmitter 4 and 5 wireless connections of RF receiver, the output of described RF receiver 5 is connected with the first input end of voltage comparison unit 6, and second input of this voltage comparison unit 6 also is connected with the canonical reference voltage U
RefThe output of this voltage comparison unit 6 is connected with soft switch working point selected cell 7, the output of this soft switch working point selected cell 7 is connected with signal frequency split unit 8, the output of this signal frequency split unit 8 is connected with drive circuit 9, and 4 tunnel drive signals of these drive circuit 9 outputs are connected to the described first switching tube S
1, second switch pipe S
2, the 3rd switching tube S
3And the 4th switching tube S
4Drive end on.
Described former limit resonant circuit L
p, C
pOn be connected with current detecting unit 10, the output of this current detecting unit 10 is connected with the fundamental frequency signal input of described signal frequency split unit 8.
Described current rectifying and wave filtering circuit 2 is by the first diode D
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4And low-pass filtering capacitor C
dForm, wherein the first diode D
1, the second diode D
2, the 3rd diode D
3With the 4th diode D
4Form bridge rectifier, connect described secondary resonant circuit L between two inputs of this bridge rectifier
s, C
s, connect described low-pass filtering capacitor C between two output ends of this bridge rectifier
d, in the low-pass filtering capacitor C
dTwo ends connect described variable load R
L
Operation principle of the present utility model is:
In contactless energy transmission system, according to the soft switch of voltage-type resonant transform circuit working point analysis theories as can be known, there is a former limit resonance current cycle fixed point function in system, there is a series of zero crossing in this function, each zero crossing is corresponding to the switching frequency of an inverter, the switching frequency of inverter changes, and can change resonance current i
pAmplitude and the through-put power of system, but former limit resonance current is constant cycle of oscillation.
According to this theory, we adopt the zero passage detection unit to detect the zero cross signal of former limit resonance current, and with the frequency f of this zero cross signal
0Switching frequency during as system's maximum transmission power is by 8 pairs of these zero cross signal frequency f in signal frequency split unit
0Make frequency division and handle, the signal frequency behind the frequency division is as the switching frequency of inverter.Because along with the decline of inverter switching frequency, former limit resonance current i
pAmplitude can descend, the through-put power of system can reduce, so decide the divide ratio n of signal frequency split unit 8 by soft switch working point selected cell 7, realizes the adjusting of switching frequency by the size of adjusting divide ratio n.
In specific implementation process, the output voltage U that we detect on the variable load RL by voltage detection unit 3
Out, and be wirelessly transmitted in the voltage comparison unit 6 by RF transmitter 4 and RF receiver 5, voltage comparison unit 6 is provided with the canonical reference voltage U
Ref,, this voltage comparison unit 6 is with the voltage data U that receives
OutWith the canonical reference voltage U
RefCompare, and comparative result e is sent to soft switch working point selected cell 7, wherein e=U
Ref-U
OutIf, output voltage U
OutBe lower than the canonical reference voltage U
Ref, comparative result e＞0 then, described soft switch working point selected cell 7 will reduce divide ratio n, make n=n-2, thereby increase switching frequency f, make former limit resonance current i
pAmplitude increase, increase the through-put power of system, make output voltage U
OutBe improved.
If output voltage U
OutBe higher than the canonical reference voltage U
Ref, comparative result e＜0 then, described soft switch working point selected cell 7 will increase divide ratio n, make n=n+2, thereby reduce switching frequency f, make former limit resonance current i
pAmplitude reduce, reduce the through-put power of system, make output voltage U
OutStep-down.
If output voltage U
OutEqual the canonical reference voltage U
Ref, comparative result e=0 then, described soft switch working point selected cell 7 will keep divide ratio n constant, and switching frequency f can not change, and the original through-put power of maintenance system makes output voltage U
OutStable.
When variable load thereupon the change of applied environment and when change in resistance took place, the output voltage in the load can change, by the way can so that load when changing system can keep more stable output, thereby realized the control of power transfer.
Claims (4)
1. a power control circuit that is used for contactless energy transmission system comprises DC power supply (E
Dc), inverter (1), former limit resonant circuit (L
p, C
p), secondary resonant circuit (L
s, C
s), current rectifying and wave filtering circuit (2) and variable load (R
L), described inverter (1) is the first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3) and the 4th switching tube (S
4) bridge inverter main circuit formed;
It is characterized in that: described variable load (R
L) the high level end be connected with voltage detection unit (3), the output of this voltage detection unit (3) is connected with RF transmitter (4), this RF transmitter (4) and RF receiver (5) wireless connections, the output of described RF receiver (5) is connected with the first input end of voltage comparison unit (6), and second input of this voltage comparison unit (6) also is connected with canonical reference voltage (U
Ref), the output of this voltage comparison unit (6) is connected with soft switch working point selected cell (7), the output of this soft switch working point selected cell (7) is connected with signal frequency split unit (8), the output of this signal frequency split unit (8) is connected with drive circuit (9), and 4 tunnel drive signals of this drive circuit (9) output are connected to the described first switching tube (S
1), second switch pipe (S
2), the 3rd switching tube (S
3) and the 4th switching tube (S
4) drive end on.
2. the power control circuit that is used for contactless energy transmission system according to claim 1 is characterized in that: described former limit resonant circuit (L
p, C
p) on be connected with current detecting unit (10), the output of this current detecting unit (10) is connected with the fundamental frequency signal input of described signal frequency split unit (8).
3. the power control circuit that is used for contactless energy transmission system according to claim 1 is characterized in that: described current rectifying and wave filtering circuit (2) is by the first diode (D
1), the second diode (D
2), the 3rd diode (D
3), the 4th diode (D
4) and low-pass filtering electric capacity (C
d) composition, the wherein first diode (D
1), the second diode (D
2), the 3rd diode (D
3) and the 4th diode (D
4) form bridge rectifier, connect described secondary resonant circuit (L between two inputs of this bridge rectifier
s, C
s), connect described low-pass filtering electric capacity (C between two outputs of this bridge rectifier
d), at low-pass filtering electric capacity (C
d) two ends connect described variable load (R
L).
4. the power control circuit that is used for contactless energy transmission system according to claim 1 is characterized in that: described former limit resonant circuit (L
p, C
p) and secondary resonant circuit (L
s, C
s) be the tandem resonant tank that resonant inductance becomes with the resonance capacitance group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202779101U CN201742175U (en) | 2010-07-30 | 2010-07-30 | Power control circuit used for contactless energy transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202779101U CN201742175U (en) | 2010-07-30 | 2010-07-30 | Power control circuit used for contactless energy transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201742175U true CN201742175U (en) | 2011-02-09 |
Family
ID=43557454
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202779101U Expired - Lifetime CN201742175U (en) | 2010-07-30 | 2010-07-30 | Power control circuit used for contactless energy transmission system |
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| Country | Link |
|---|---|
| CN (1) | CN201742175U (en) |
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| CN102290874A (en) * | 2011-08-22 | 2011-12-21 | 重庆大学 | Power regulating circuit of non-contact type energy transmission system and control method thereof |
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| CN104682583A (en) * | 2015-03-27 | 2015-06-03 | 南京矽力杰半导体技术有限公司 | Resonant noncontact power supply device, electric energy transmitting terminal and control method |
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| CN104868572A (en) * | 2015-06-08 | 2015-08-26 | 京东方科技集团股份有限公司 | Wireless charging system and method |
| CN105186718A (en) * | 2015-10-22 | 2015-12-23 | 重庆大学 | Composite resonant ECPT system and parameter design method thereof |
| CN106240395A (en) * | 2016-08-29 | 2016-12-21 | 重庆大学 | The sectional guide rail soft handover method of electric automobile wireless power supply system |
| CN108297719A (en) * | 2017-01-12 | 2018-07-20 | 福特全球技术公司 | integrated wireless power transmission system |
| CN108297719B (en) * | 2017-01-12 | 2023-08-08 | 福特全球技术公司 | Integrated wireless power transfer system |
| CN108879983A (en) * | 2018-07-11 | 2018-11-23 | 西安电子科技大学 | The non-contact type apparatus for transmitting electric energy of electromagnetic force can be offset |
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| GR01 | Patent grant | ||
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Granted publication date: 20110209 |