CN102969802B - Current type wireless power supply system load self-adapting control method - Google Patents

Current type wireless power supply system load self-adapting control method Download PDF

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CN102969802B
CN102969802B CN201210430818.8A CN201210430818A CN102969802B CN 102969802 B CN102969802 B CN 102969802B CN 201210430818 A CN201210430818 A CN 201210430818A CN 102969802 B CN102969802 B CN 102969802B
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power supply
value
circuit
load
current
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CN102969802A (en
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王智慧
孙跃
苏玉刚
唐春森
戴欣
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Chongqing Aipute Electric Co ltd
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Chongqing University
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Abstract

The invention discloses a current type wireless power supply system load self-adapting control method. The method comprises steps of measuring the current value Idc of a direct current power supply of a current type wireless power supply system; calculating the load value RL of a load circuit in accordance with the current value Idc of the direct current power supply; calculating a minimum angle frequency value omega meeting the preset transmission efficiency eta in accordance with the load value RL of the load circuit; and adjusting a variable component of a primary side resonant network, and enabling the resonance angular frequency omega 0 of the primary side resonant network to be equal to omega. The method the advantages that a wireless communication module is not used, the design cost is low, only a parameter is measured, the detection error is little, the accuracy is high, the circuit design is simple, the implementation is easy, the system determines the variation condition of the load circuit in accordance with the real-time detected current value of the direct current power supply, the parameter of the primary side resonant network is changed in accordance with the change of the load circuit, the working efficiency of the system is improved and the system has high working efficiency when the load is changed dynamically.

Description

Current mode wireless power supply system loaded self-adaptive control method
Technical field
The present invention relates to wireless power transmission technology, specifically, is a kind of current mode wireless power supply system loaded self-adaptive control method.
Background technology
Along with socioeconomic development and scientific and technical progress, people are for portable, safety, and efficient, the requirement of the concepts such as environmental protection is more and more higher.So-called wireless power transmission technology (WirelessPower Transmi ss ion Technique) refers to the technology such as comprehensive utilization modern power electronic energy conversion technology, Circuit theory, microelectric technique and modern control, realize electric energy and pass to power consumption equipment by soft-medium (as electric field, magnetic field, microwave, laser etc.) with non-electrical contact pattern from power supply (electrical network or battery), or power consumption equipment by soft-medium by energy feedback power.Be to utilize certain special installation to change the electric energy of power supply into wireless mode to propagate, thereby thering is no to realize delivery of electrical energy under cable connection.
Induction coupling electric energy transmission technology (Inductively Coupled PowerTransfer), is called for short ICPT technology, is a kind of common wireless power transmission technology, it by electromagnetic coupled in contactless mode to load transfer energy.
As shown in Figure 1, existing ICPT system is generally made up of primary circuit and pick-up circuit, primary circuit is provided with current rectifying and wave filtering circuit, DC/DC translation circuit and high-frequency inverter circuit, power frequency supply is converted to direct current output after current rectifying and wave filtering circuit, carry out voltage transformation through DC/DC circuit, then be converted to high-frequency alternating current by high-frequency inverter circuit, the high-frequency ac of high-frequency inverter circuit output is outwards launched electric energy by guide rail coil, in pick-up circuit, be provided with mechanism for picking, utilize space magnetic field coupling to pick up the energy of guide rail coil transmitting, the energy of mechanism for picking output is adjusted through power governor, the most backward power consumption equipment provides energy.
According to input power mode difference in primary circuit, existing ICPT system is divided into again current mode ICPT system and current mode ICPT system, and so-called current mode ICPT system refers to that the input of power supply is by DC power supply E dcwith DC inductance L dcform, its input is similar to a current source.
As shown in Figure 2, common current mode ICPT circuit system model, resistance R dcfor the equivalent internal resistance of DC power supply, switch element S 1, S 2, S 3and S 4composition bridge-type high-frequency inverter circuit, resistance R D is transmitting coil equivalent resistance, the equivalent resistance that resistance R s is pick-up winding, the equivalent load that resistance R L is load circuit.
In fact, as a kind of electric power system, its load often has very large randomness, and for current mode ICPT system, the variation of load may cause the hydraulic performance declines such as power delivery ability, power transmission efficiency and the output quality of system.Therefore, the situation of change of necessary Dynamic Recognition load, strives current mode ICPT system different loads is entered to corresponding best power transmit stage.Meanwhile, by means of load identification, the resonance current constant current control of former limit, the constant voltage control of output loading voltage and operating frequency frequency stabilization control all can easily realize.
Obtain energy and the feature of ICPT system is load from former limit by the mode of air insulated, due to former and deputy limit without any electrical connection, so be difficult to by the load information of secondary accurately and fast feed back to former limit.
In prior art, mainly adopt and realize in two ways load identification: the one, adopt wireless communication technology, need to utilize wireless communication module, cost is higher, and the interference of high frequency magnetic field has reduced the reliability of radio communication; The 2nd, based on the discrimination method of reflected umpedance, carry out identification load by sampling resonance current, resonance potential and resonance frequency, but because the variable detecting is more, the design comparison complexity of hardware circuit, and also the measure error of any one amount will cause the inaccuracy of final identification result.
Meanwhile, as a kind of electric power system, its load often has very large randomness, and we need to do corresponding adjustment according to the load of real-time change, to ensure that system always works in higher level of efficiency.
Existing loaded self-adaptive technology often adopts secondary short circuit decoupling method, and the different reflected umpedance producing according to the former limit of not coexisting of load, carries out corresponding short circuit decoupling zero processing to secondary, to reach the object on the former limit of systems stabilisation.
Its defect is: adopt secondary short circuit decoupling method, owing to additionally having increased DC/DC converter, therefore entire system efficiency is low, in addition, the method is a kind of passive control methods for underloading, and in the time of load dynamic change, former limit still can be influenced.
Summary of the invention
In order to overcome above-mentioned defect, the invention provides a kind of current mode wireless power supply system loaded self-adaptive control method, by changing the resonance angular frequency of former limit resonant circuit, make the efficiency of system reach optimum.
In order to achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of current mode wireless power supply system loaded self-adaptive control method, its key is to carry out according to following steps:
Step 1: measure DC power supply current value I in current mode wireless power supply system dc;
Step 2: according to DC power supply current value I dccomputational load circuit load value R l;
Step 3: according to load circuit load value R lcalculate the minimum angular frequency value ω that meets default efficiency of transmission η;
Step 4: regulate the variable element in the turnable resonator network of former limit, make the resonance angular frequency ω of former limit turnable resonator network 0=ω.
As further describing, current mode wireless power supply system in step 1 comprises direct current input module, high-frequency inverter circuit, former limit turnable resonator network, secondary resonant network and load circuit, described direct current input module is made up of DC power supply and DC inductance, described high-frequency inverter circuit is full bridge inverter, described former limit turnable resonator network is the shunt-resonant circuit of transmitting coil and former limit building-out capacitor composition, transmitting coil effective inductance value L wherein padjustable or former limit building-out capacitor effective capacitance value C padjustable, described secondary resonant network is the series resonant tank of pick-up winding and secondary building-out capacitor composition;
On the loop between high-frequency inverter circuit and direct current input module, be connected with current detection module, this current detection module is for detection of described DC power supply current value I dc.
Current collection circuit is provided with sampling resistor conventionally, and the AD sampling functions that microcontroller utilization carries can gather corresponding magnitude of voltage on sampling resistor, can calculate DC power supply current value I according to the relation of sampled voltage and sampling resistor dc.
Circuit parameter in described current mode wireless power supply system comprises DC power supply magnitude of voltage E dc, DC power supply internal resistance value R dc, DC inductance inductance value L dc, transmitting coil effective inductance value L p, transmitting coil equivalent resistance R p, coefficient of mutual inductance M and current resonance angular frequency ω 1;
In step 2, according to determine the load value R of load circuit i, wherein I p = πE dc 2 2 ( ω 1 L p + R p ) .
Can find out according to above-mentioned steps, after the circuit model of system and circuit parameter are determined, only need to detect DC power supply current value I dccan calculate the load R of load circuit l, circuit structure is simple, and detected parameters is single, accuracy is high, system can, according to the situation of change of DC power supply current value real-time tracking load circuit, be the resonance current constant current control of former limit, and the constant voltage control of output loading voltage and operating frequency frequency stabilization control provide effective help.
In step 3, according to determine the minimum angular frequency value ω that meets default efficiency of transmission η.
In step 4, by adjusting transmitting coil effective inductance value L por former limit building-out capacitor effective capacitance value C p, make the resonance angular frequency of former limit turnable resonator network
Described direct current input module is provided with current rectifying and wave filtering circuit and DC/DC translation circuit, connects power frequency AC at the input of current rectifying and wave filtering circuit.
Direct current input module can directly adopt constant voltage dc source, also can utilize power frequency AC, in the time utilizing power frequency AC, described direct current input module is provided with current rectifying and wave filtering circuit and DC/DC translation circuit, connects power frequency AC at the input of current rectifying and wave filtering circuit.
Remarkable result of the present invention is: do not use wireless communication module, design cost is low, only measure a parameter, detect error little, precision is high, circuit design is simple, it is convenient to implement, and system judges the situation of change of load circuit according to real-time detection DC power supply current value, changes the parameter of former limit turnable resonator network according to the variation of load circuit, thereby the operating frequency that changes system, makes system in load dynamic change, keep higher operating efficiency.
Brief description of the drawings
Fig. 1 is the schematic block circuit diagram of existing ICPT system;
Fig. 2 is the circuit theory diagrams of current mode ICPT system;
Fig. 3 is schematic block circuit diagram of the present invention;
Fig. 4 is the equivalent circuit diagram of the former limit of the present invention main circuit;
Fig. 5 is load value R lwith DC power supply current value I dcbetween linear relationship chart.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention and operation principle are described in further detail.
A kind of current mode wireless power supply system loaded self-adaptive control method, its key is to carry out according to following steps:
Step 1: measure DC power supply current value I in current mode wireless power supply system dc;
Step 2: according to DC power supply current value I dccomputational load circuit load value R l;
Step 3: according to load circuit load value R lcalculate the minimum angular frequency value ω that meets default efficiency of transmission η;
Step 4: regulate the variable element in the turnable resonator network of former limit, make the resonance angular frequency ω of former limit turnable resonator network 0=ω.
As shown in Figure 3, the current mode wireless power supply system in step 1 comprises direct current input module 1, high-frequency inverter circuit 2, former limit turnable resonator network 3, secondary resonant network 4 and load circuit 5 to embodiment.
Shown in Fig. 2, described direct current input module 1 is made up of DC power supply and DC inductance, and described high-frequency inverter circuit 2 is switch element S 1, S 2, S 3, S 4the full bridge inverter of composition, described former limit turnable resonator network 3 is the shunt-resonant circuit of transmitting coil and former limit building-out capacitor composition, described transmitting coil effective inductance value L padjustable or former limit building-out capacitor effective capacitance value C padjustable, described secondary resonant network 4 is the series resonant tank of pick-up winding and secondary building-out capacitor composition;
On the loop between high-frequency inverter circuit 2 and direct current input module 1, be connected with current detection module 6, this current detection module 6 is for detection of described DC power supply current value I dc.
Circuit parameter in described current mode wireless power supply system comprises DC power supply magnitude of voltage E dc, DC power supply internal resistance value R dcdC inductance inductance value L dctransmitting coil effective inductance value L p, transmitting coil equivalent resistance R p, coefficient of mutual inductance M and current resonance angular frequency ω 1;
In step 2, according to R L = M 2 I p 2 ω 1 2 E dc I dc - I dc 2 R dc - I p 2 R p Determine the load value R of load circuit 5 l, wherein I p = πE dc 2 2 ( ω 1 L p + R p ) .
In step 3, according to determine the minimum angular frequency value ω that meets default efficiency of transmission η.
In step 4, by adjusting transmitting coil effective inductance value L por former limit building-out capacitor effective capacitance value C p, make the resonance angular frequency of former limit turnable resonator network 3
DC power supply in direct current input module 1 can directly adopt constant voltage dc source to provide, and engineering is utilized industrial frequency AC input conventionally in applying, therefore in direct current input module 1, be provided with current rectifying and wave filtering circuit and DC/DC translation circuit, connect power frequency AC at the input of current rectifying and wave filtering circuit.
Operation principle of the present invention is as follows:
In current mode ICPT system work process, the information of load can be reflected in the impedance on former limit, therefore can directly survey to judge load information at former frontier inspection.
Circuit equivalent model as shown in Figure 4, secondary will produce certain impedance Z on former limit r, the reflected umpedance of system is by power component R rwith reactive component L rcomposition, wherein on power component, consumed power is the dissipation power that secondary produces in the part of former limit, and the not produce power dissipation of its reactive component.
The input power of supposing the system is S (E dc, I dc)=E dci dc, the power output of system is P 0 ( I p , R r ) = I p 2 R r , The loss power of system is P loss ( I , R ) = I p 2 R p + I dc 2 R dc , Wherein I p = πE dc 2 2 ( ω 1 L p + R p ) ; Obtained by energy conservation relation: S (E dc, I dc)=P o(I p, R r)+P loss(I, R), therefore, known load and reflected umpedance power component R again rpass be can obtain the load value R of load circuit lwith input DC power current value I dcpass be: R L = M 2 I p 2 ω 2 E dc I dc - I dc 2 R dc - I p 2 R p .
From above formula, system E dc, L p, R p, R dc, ω, M be known, I pknown, if measure I dc, can know R lvalue.
Random Selecting All Parameters E dc=310V, L p=155 μ H, R dc=0.5 Ω, R p=0.2 Ω, ω=125600rad/s, M=45 μ H, can obtain load R lwith major loop DC power supply current value I dcrelation as shown in Figure 5.
As shown in Figure 5, the load value R of load circuit lwith DC power supply current value I dcpresent the relation of successively decreasing, load is larger, and loop current is less.Therefore,, by detecting the size of the loop current in high-frequency inverter circuit, according to the relational expression of electric current and load, can judge load now.
Once know after the changing condition of load, get final product the loss situation of analytical system each several part, system loss mainly comprises former limit transmitting coil thermal losses P 1with secondary pick-up winding thermal losses P 2, because the former limit of system is operated in soft on off state, so switching loss is zero.
Can obtain by analyzing:
P 1 = I p 2 R p = πE dc 2 2 R p 2 ( ω L p ) 2 R p ≈ πE dc R p 2 2 ωL p ;
P 2 = I s 2 R s = ω 2 M 2 I p 2 R s ( R L + R s ) ;
Power output P 0for:
P 0 = I L 2 R = ω 2 M 2 I p 2 R ( R L + R s ) 2 ;
Therefore system effectiveness η is:
η = ω 2 M 2 R L ω 2 M 2 ( R L + R s ) + R p ( R L + R s ) 2 ;
Because R s< < R ltherefore efficiency eta can be simplified to:
&eta; = 1 1 + R L R p &omega; 2 M 2 ;
The known stabilised efficiency that makes is in higher level, load R lbecome large, resonance angular frequency ω needs suitably to increase.
In the situation that meeting default efficiency of transmission η, minimum angular frequency should meet:
&omega; &GreaterEqual; M 1 - &eta; &eta; R L R p .
By electric inductance array or capacitor array are set, utilize microprocessor 7 and drive circuit 8 to control the on off state of switch element in the turnable resonator network 3 of former limit, thereby change transmitting coil effective inductance value L por former limit building-out capacitor effective capacitance value C p, make the resonance angular frequency ω of former limit turnable resonator network 3 0=ω, thus the stable of whole system operating efficiency ensured.

Claims (3)

1. a current mode wireless power supply system loaded self-adaptive control method, is characterized in that carrying out according to following steps:
Step 1: measure DC power supply current value I in current mode wireless power supply system dc;
Step 2: according to DC power supply current value I dccomputational load circuit load value R l;
Step 3: according to load circuit load value R lcalculate the minimum frequency value ω that meets default efficiency of transmission η;
Step 4: regulate the variable element in the resonant network of former limit, make the natural resonance frequency ω of former limit resonant network 0=ω;
Current mode wireless power supply system in described step 1 comprises direct current input module (1), high-frequency inverter circuit (2), former limit turnable resonator network (3), secondary resonant network (4) and load circuit (5), described direct current input module (1) is made up of DC power supply and DC inductance, described high-frequency inverter circuit (2) is full bridge inverter, described former limit turnable resonator network (3) is the shunt-resonant circuit of transmitting coil and former limit building-out capacitor composition, transmitting coil effective inductance value L wherein padjustable or former limit building-out capacitor effective capacitance value C padjustable, described secondary resonant network (4) is the series resonant tank of pick-up winding and secondary building-out capacitor composition;
On the loop between high-frequency inverter circuit (2) and direct current input module (1), be connected with current detection module (6), this current detection module (6) is for detection of described DC power supply current value I dc;
Circuit parameter in described current mode wireless power supply system comprises DC power supply magnitude of voltage E dc, DC power supply internal resistance value R dc, DC inductance inductance value L dc, transmitting coil effective inductance value L p, transmitting coil equivalent resistance R p, coefficient of mutual inductance M and inverter switching device control frequency ω 1;
In step 2, according to determine the load value R of load circuit (5) l, wherein I p = &pi; E dc 2 2 ( &omega; 1 L p + R p ) ;
In step 3, according to determine the minimum frequency value ω that meets default efficiency of transmission η.
2. current mode wireless power supply system loaded self-adaptive control method according to claim 1, is characterized in that: in step 4, by adjusting transmitting coil effective inductance value L por former limit building-out capacitor effective capacitance value C p, make the natural resonance frequency of former limit turnable resonator network (3) &omega; 0 = 1 L p C p = &omega; .
3. current mode wireless power supply system loaded self-adaptive control method according to claim 1, it is characterized in that: described direct current input module (1) is provided with current rectifying and wave filtering circuit and DC/DC translation circuit, connect power frequency AC at the input of current rectifying and wave filtering circuit.
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