CN103779951B - Electric bicycle magnet coupled resonant type wireless charger - Google Patents
Electric bicycle magnet coupled resonant type wireless charger Download PDFInfo
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Abstract
The invention provides a kind of electric bicycle magnet coupled resonant type wireless charger, comprise main circuit part and control circuit part; Main circuit part comprises full-bridge rectification filter circuit, half-bridge inversion circuit, transmitting terminal series resonant circuit, receiving terminal series resonant circuit, high frequency transformer T1, rectifier filter circuit; Control circuit part comprises receiving-end voltage current detection circuit, receiving terminal charge data transtation mission circuit, transmitting terminal receive data by wireless circuit, transmitting terminal current detection circuit, phase-locked loop frequency tracking circuit, PWM inverter control circuit, inverse changing driving circuit.The present invention adopts wireless charging to replace wired charging, realizes the charging of electric bicycle magnet coupled resonant type wireless, eliminates the electric spark that produces in swapping process of attaching plug, affects the trouble that plug life-span and loose contact bring, facilitates charging operations; By resonance coupled transfer electric energy, and reduce electric energy transmitted frequency, greatly reduce the impact of Electromagnetic Radiation on Environment.
Description
Technical field
The present invention relates to magnet coupled resonant type wireless electric energy transmission technology, especially a kind of electric bicycle magnet coupled resonant type wireless charger.
Background technology
The charger that current electric bicycle uses, be substantially all wired charger, attaching plug can produce electric spark in swapping process, affects the plug life-span, and the time has been grown and also can cause loose contact.To charge this technical field at electric bicycle, also do not have ripe wireless charging technical scheme at present.
The subject matter that wireless charging exists at present is, one is that efficiency is not high, main cause is that the control of energy is more difficult, really cannot realize the point-to-point transmission of energy, meeting scattering equal loss part energy in the process of transmission, the efficiency of energy converter is not high is also the key factor affecting whole system efficiency; Two is electromagnetic radiation safety problems, needs to solve on the impact of personal safety and surrounding environment.Because the transmission of wireless energy both can be well controlled on the transmit path unlike traditional supply power mode, also unlike wireless telecommunications, transmit small power, high-octane energy density will certainly bring impact to personal safety.
Magnet coupled resonant type wireless delivery of electrical energy adopts two same frequency resonant circuits, and utilize magnetic field by near field transmission, radiation is little, has directivity, and moderate distance is transmitted, and efficiency of transmission is higher.In magnet coupled resonant type wireless delivery of electrical energy, electromagnetic field increases with transmission range and decays rapidly, the circuit utilizing two generation resonance to be coupled catches the electromagnetic field with range attenuation, namely, when launching circuit and receiving loop generation resonance, most of energy is made to be delivered to receiving loop by launching circuit.
Therefore utilizing magnet coupled resonant type wireless electric energy transmission technology to realize wireless charger, is that a kind of efficiency is high, the technical scheme that electromagnetic radiation is relatively little.
Summary of the invention
The object of the present invention is to provide a kind of electric bicycle magnet coupled resonant type wireless charger, the electric spark that attaching plug produces in swapping process can be eliminated, affect the trouble that plug life-span and loose contact bring, facilitate charging operations; By resonance coupled transfer electric energy, greatly reduce the impact of Electromagnetic Radiation on Environment.The technical solution used in the present invention is:
A kind of electric bicycle magnet coupled resonant type wireless charger, comprises main circuit part and control circuit part.Main circuit part comprises full-bridge rectification filter circuit, half-bridge inversion circuit, transmitting terminal series resonant circuit, receiving terminal series resonant circuit, high frequency transformer T1, rectifier filter circuit; Control circuit part comprises receiving-end voltage current detection circuit, receiving terminal charge data transtation mission circuit, transmitting terminal receive data by wireless circuit, transmitting terminal current detection circuit, phase-locked loop frequency tracking circuit, PWM inverter control circuit, inverse changing driving circuit.
Input ac voltage converts galvanic current pressure Ud1 to through full-bridge rectification filter circuit, exports high-frequency ac voltage U1 through half-bridge inversion circuit, produces resonance potential and resonance current and launching circuit resonance current i1 in transmitting terminal series resonant circuit; The resonance frequency of receiving terminal series resonant circuit and transmitting terminal series resonant circuit is equal, receiving loop output voltage U2 is produced by electromagnetic coupled resonance, receiving loop output voltage U2 is transformed into and exports high frequency voltage corresponding to charging voltage Uo through high frequency transformer T1, carry out rectification and filtering through rectifier filter circuit, export charging voltage Uo.Receiving-end voltage current detection circuit detects charging voltage and the charging current of receiving terminal output, and charging voltage and charging current data are through receiving terminal charge data transtation mission circuit wireless transmission subsequently; Transmitting terminal receive data by wireless circuit receives and sends the charging voltage received and charging current data to PWM inverter control circuit; Launching circuit resonance current, by after transmitting terminal current detection circuit acquisition testing, produces frequency-tracking signal, to PWM inverter control circuit through phase-locked loop frequency tracking circuit; PWM inverter control circuit is according to the charging voltage set-point set, charging voltage and charging current detected value and frequency-tracking signal, produce the PWM pulse-width modulation control signal of respective frequencies and pulse duration, carry out isolating and power amplification through inverse changing driving circuit, export driving pulse Ug1 and Ug2, control the switching tube in half-bridge inversion circuit.Pulse width modulation (PWM) is the abbreviation of English " PulseWidthModulation ".
Described full-bridge rectification filter circuit comprises diode D1 ~ D4 and filter capacitor Cd1, and diode D1 ~ D4 forms an input full bridge rectifier, and filter capacitor Cd1 is connected in parallel on two outputs of input full bridge rectifier.
Described half-bridge inversion circuit comprises MOS switching tube VT1, VT2 and anti-paralleled diode VD1, VD2; Described transmitting terminal series resonant circuit comprises resonant capacitance C1 and the transmitting coil L1 of series connection; The grid of switching tube VT1, VT2 meets driving pulse Ug1 and Ug2 respectively, and the drain electrode of switching tube VT1 connects the positive output end of input full bridge rectifier, and source electrode connects the drain electrode of switching tube VT2, and the source electrode of switching tube VT2 connects the negative output terminal of input full bridge rectifier; The negative electrode of diode VD1 and anode connect drain electrode and the source electrode of switching tube VT1 respectively; The negative electrode of diode VD2 and anode connect drain electrode and the source electrode of switching tube VT2 respectively; The drain node that is connected of switching tube VT1 source electrode and switching tube VT2 connects one end of transmitting terminal series resonant circuit, the negative output terminal of another termination input full bridge rectifier of transmitting terminal series resonant circuit.
Described receiving terminal series resonant circuit comprises resonant capacitance C2 and the receiving coil L2 of series connection; The two ends of series resonant circuit are connected with the elementary two ends of high frequency transformer T1 respectively; The value of resonant capacitance C1 and transmitting coil L1, and the value of resonant capacitance C2 and receiving coil L2 makes the resonance frequency of receiving terminal series resonant circuit and transmitting terminal series resonant circuit equal, and resonance frequency is less than 200KHz.
Described rectifier filter circuit comprises diode Dr1-Dr4 and filter capacitor Cd2, diode Dr1-Dr4 forms high frequency full bridge rectifier, the secondary two ends of the input termination high frequency transformer T1 of this high frequency full bridge rectifier, filter capacitor Cd2 is connected in parallel on two outputs of this high frequency full bridge rectifier.
Described receiving-end voltage current detection circuit, comprises direct current voltage sensor V2 and DC current sensor A2, exports charging voltage and charging current for detecting; Direct current voltage sensor V2 is connected in parallel on two outputs of high frequency full bridge rectifier, and DC current sensor A2 is arranged on an output of high frequency full bridge rectifier.
Described receiving terminal charge data transtation mission circuit is used for charging voltage and charging current data to be wirelessly transmitted in transmitting terminal receive data by wireless circuit; Transmitting terminal receive data by wireless circuit is for receiving charging voltage and charging current data and sending PWM inverter control circuit to.
Described transmitting terminal current detection circuit comprises current sensor A1, for detecting electric current and the launching circuit resonance current i1 of transmitting terminal series resonant circuit.
Described phase-locked loop frequency tracking circuit, is provided for launching circuit resonance current i1 and follows the tracks of launching circuit resonance potential, keep launching circuit resonance current i1 delayed launching circuit resonance potential phase angle.
Described PWM inverter control circuit is used for, according to the charging voltage set-point set, charging voltage and charging current detected value and frequency-tracking signal, producing the PWM pulse-width modulation control signal of respective frequencies and pulse duration, being supplied to inverse changing driving circuit.
Described inverse changing driving circuit is used for PWM pulse-width modulation control signal to carry out isolating, voltage and current amplifies, and drives switching tube VT1 and VT2 in half-bridge inversion circuit.
The invention has the advantages that and adopt wireless charging to replace wired charging, eliminate the electric spark that produces in swapping process of attaching plug, affect the trouble that plug life-span and loose contact bring, facilitate charging operations; By resonance coupled transfer electric energy, reduce radio energy transmitted frequency, electric energy transmitted frequency reduces to below 200KHz, greatly reduces the impact of Electromagnetic Radiation on Environment; Adopt semi-bridge inversion and PWM pulsewidth power to control, simplify circuit structure.
Accompanying drawing explanation
Fig. 1 is electric bicycle magnet coupled resonant type wireless charger construction block diagram.
Fig. 2 is electric bicycle magnet coupled resonant type wireless charger main circuit schematic diagram.
Fig. 3 is one of electric bicycle magnet coupled resonant type wireless charger main circuit work wave.
Fig. 4 is electric bicycle magnet coupled resonant type wireless charger main circuit work wave two.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
According to technical scheme provided by the invention, a kind of electric bicycle magnet coupled resonant type wireless charger, is characterized in that: comprise main circuit part and control circuit part; Main circuit part comprises full-bridge rectification filter circuit, half-bridge inversion circuit, transmitting terminal series resonant circuit, receiving terminal series resonant circuit, high frequency transformer T1, rectifier filter circuit; Control circuit part comprises receiving-end voltage current detection circuit, receiving terminal charge data transtation mission circuit, transmitting terminal receive data by wireless circuit, transmitting terminal current detection circuit, phase-locked loop frequency tracking circuit, PWM inverter control circuit, inverse changing driving circuit.
Full-bridge rectification filter circuit comprises diode D1 ~ D4 and filter capacitor Cd1, and diode D1 ~ D4 forms an input full bridge rectifier, and filter capacitor Cd1 is connected in parallel on two outputs of input full bridge rectifier.
Half-bridge inversion circuit comprises MOS switching tube VT1, VT2 and anti-paralleled diode VD1, VD2.Transmitting terminal series resonant circuit comprises resonant capacitance C1 and the transmitting coil L1 of series connection; The grid of switching tube VT1, VT2 meets driving pulse Ug1 and Ug2 respectively, and the drain electrode of switching tube VT1 connects the positive output end of input full bridge rectifier, and source electrode connects the drain electrode of switching tube VT2, and the source electrode of switching tube VT2 connects the negative output terminal of input full bridge rectifier; The negative electrode of diode VD1 and anode connect drain electrode and the source electrode of switching tube VT1 respectively; The negative electrode of diode VD2 and anode connect drain electrode and the source electrode of switching tube VT2 respectively; The drain node that is connected of switching tube VT1 source electrode and switching tube VT2 connects one end of transmitting terminal series resonant circuit, the negative output terminal of another termination input full bridge rectifier of transmitting terminal series resonant circuit.
Receiving terminal series resonant circuit comprises resonant capacitance C2 and the receiving coil L2 of series connection; The two ends of series resonant circuit are connected with the elementary two ends of high frequency transformer T1 respectively; The value of resonant capacitance C1 and transmitting coil L1, and the value of resonant capacitance C2 and receiving coil L2 makes the resonance frequency of receiving terminal series resonant circuit and transmitting terminal series resonant circuit equal, and resonance frequency is less than 200KHz.
Rectifier filter circuit comprises diode Dr1-Dr4 and filter capacitor Cd2, diode Dr1-Dr4 forms high frequency full bridge rectifier, the secondary two ends of the input termination high frequency transformer T1 of this high frequency full bridge rectifier, filter capacitor Cd2 is connected in parallel on two outputs of this high frequency full bridge rectifier.
Receiving-end voltage current detection circuit, comprises direct current voltage sensor V2 and DC current sensor A2, exports charging voltage and charging current for detecting; Direct current voltage sensor V2 is connected in parallel on two outputs of high frequency full bridge rectifier, and DC current sensor A2 is arranged on an output of high frequency full bridge rectifier.
Transmitting terminal current detection circuit comprises current sensor A1, for detecting electric current and the launching circuit resonance current i1 of transmitting terminal series resonant circuit.
System general diagram as shown in Figure 1, main circuit part: single-phase input ac voltage ~ U converts galvanic current pressure Ud1 to through diode full-bridge rectification filter circuit, export high-frequency ac voltage U1 through half-bridge inversion circuit, in the transmitting terminal series resonant circuit that resonant capacitance C1 and transmitting coil L1 forms, produce resonance potential and resonance current and launching circuit resonance current i1; Resonant capacitance C2 and receiving coil L2 forms receiving terminal series resonant circuit, the resonance frequency of receiving terminal series resonant circuit and transmitting terminal series resonant circuit is equal, receiving loop output voltage U2 and receiving loop resonance current i2 is produced by electromagnetic coupled resonance, receiving loop output voltage U2 is transformed into and exports high frequency voltage corresponding to charging voltage Uo through high frequency transformer T1, carry out rectification and filtering through rectifier filter circuit, export charging voltage Uo.
Control circuit part: the charging voltage that receiving terminal exports and charging current are transformed into 1-5V normal voltage (corresponding 4-20mA) through voltage sensor V2, current sensor A2 by receiving-end voltage current detection circuit, through the receiving terminal charge data transtation mission circuit wireless transmission that single-chip microcomputer and wireless communication module form; The transmitting terminal receive data by wireless circuit be made up of single-chip microcomputer and wireless communication module sends the charging voltage received and charging current data to PWM inverter control circuit; Launching circuit resonance current, by after current sensor A1, transmitting terminal current detection circuit acquisition testing, is transformed into 1-5V standard alternating block voltage, produces frequency-tracking signal, to PWM inverter control circuit through phase-locked loop frequency tracking circuit; PWM inverter control circuit is according to the charging voltage set-point set, charging voltage and charging current detected value and frequency-tracking signal, produce the PWM pulse-width modulation control signal of respective frequencies and pulse duration, carry out isolating and power amplification through inverse changing driving circuit, export driving pulse Ug1 and Ug2, control switching tube VT1 and VT2 in half-bridge inversion circuit.
Further as shown in Figure 2, main circuit schematic diagram, the single-phase diode full bridge rectifier that single-phase AC voltage ~ U forms through diode D1-D4, be transformed into direct voltage, galvanic current pressure Ud1 is transformed into through filter capacitor Cd1, through being transformed into high-frequency ac square-wave voltage U1 primarily of the half-bridge inversion circuit of VT1, VT2 composition, through the transmitting terminal series resonant circuit that transmitting coil L1 and resonant capacitance C1 form, in transmitting coil L1, produce resonance potential and electric current is launched receiving coil L2.Receiving coil L2 and resonant capacitance C2 forms receiving terminal series resonant circuit.Receiving loop output voltage U2, is transformed into and exports high frequency voltage corresponding to charging voltage Uo through high frequency transformer T1, and the full bridge rectifier formed via high-frequency diode Dr1-Dr4 is transformed into direct voltage, through filter capacitor Cd2 filtering, exports charging voltage Uo.
Main circuit each point waveform time further as maximum in Fig. 3, PWM control impuls width.
T1-t2, the t1 moment, phase-locked loop frequency tracking circuit detects launching circuit resonance current i1 zero crossing, PWM inverter control circuit, according to i1 crossover point signal, sends inversion drive singal Ug1=high level by inverse changing driving circuit, makes VT1 conducting, VT2 continues to turn off, half-bridge inversion circuit output voltage U1 is just, its amplitude is Ud1, and launching circuit resonance current i1 rises; Receiving loop output voltage U2 and receiving loop resonance current i2 follows U1 and i1 change;
T2-t3, the t2 moment, before phase-locked loop frequency tracking circuit detects that launching circuit resonance current i1 gets back to zero crossing, PWM inverter control circuit is according to the current signal before i1 zero passage, send inversion by inverse changing driving circuit and drive cut-off signals Ug1=0, VT1 is turned off, and VT2 continues to turn off simultaneously, enters Dead Time;
T3-t4, the t3 moment, phase-locked loop frequency tracking circuit detects launching circuit resonance current i1 zero crossing, PWM inverter control circuit, according to i1 crossover point signal, sends inversion drive singal Ug2=high level by inverse changing driving circuit, makes VT2 conducting, VT1 continues to turn off, half-bridge inversion circuit enters inner loop stream mode, U1=0, and launching circuit resonance current i1 declines; Receiving loop output voltage U2 and receiving loop resonance current i2 follows U1 and i1 change;
T4-t5, the t4 moment, before phase-locked loop frequency tracking circuit detects that launching circuit resonance current i1 gets back to zero crossing, PWM inverter control circuit is according to the current signal before i1 zero passage, send inversion by inverse changing driving circuit and drive cut-off signals Ug2=0, VT2 is turned off, and VT1 continues to turn off simultaneously, enters Dead Time; A work period of t1-t5 stage terminates.The t5 moment rises and starts the next work period.
Further as main circuit each point waveform during Fig. 4, PWM control impuls width adjusting.
T1-t2, the t1 moment, phase-locked loop frequency tracking circuit detects launching circuit resonance current i1 zero crossing, PWM inverter control circuit, according to i1 crossover point signal, sends inversion drive singal Ug1=high level by inverse changing driving circuit, makes VT1 conducting, VT2 continues to turn off, half-bridge inversion circuit output voltage U1 is just, its amplitude is Ud1, and launching circuit resonance current i1 rises; Receiving loop output voltage U2 and receiving loop resonance current i2 follows U1 and i1 change;
In t2-t3, the t2 moment, PWM inverter control circuit compares according to charging voltage set-point Vg and charging voltage detected value Vo, as Vg=Vo, send inversion by inverse changing driving circuit and drive cut-off signals Ug1=0, VT1 is turned off, VT2 continues to turn off simultaneously, enters Dead Time;
In t3-t4, the t3 moment, Dead Time terminates, PWM inverter control circuit sends inversion drive singal Ug2=high level by inverse changing driving circuit, makes VT2 conducting, and VT1 continues to turn off, half-bridge inversion circuit enters inner loop stream mode, U1=0, and launching circuit resonance current i1 declines; Drop to before zero at i1, the first conducting of anti-paralleled diode VD2 of VT2, drops to after zero at i1, VT2 conducting; Receiving loop output voltage U2 and receiving loop resonance current i2 follows U1 and i1 change;
T4-t5, the t4 moment, before phase-locked loop frequency tracking circuit detects that launching circuit resonance current i1 gets back to zero crossing, PWM inverter control circuit is according to the current signal before i1 zero passage, send inversion by inverse changing driving circuit and drive cut-off signals Ug2=0, VT2 is turned off, and VT1 continues to turn off simultaneously, enters Dead Time; A work period of t1-t5 stage terminates.
The present invention adopts conventional electronic switching device can realize radio energy charging, greatly reduces the impact of Electromagnetic Radiation on Environment simultaneously.Adopt semi-bridge inversion and PWM pulsewidth power to control, simplify circuit structure.
Claims (9)
1. an electric bicycle magnet coupled resonant type wireless charger, is characterized in that: comprise main circuit part and control circuit part;
Main circuit part comprises full-bridge rectification filter circuit, half-bridge inversion circuit, transmitting terminal series resonant circuit, receiving terminal series resonant circuit, high frequency transformer T1, rectifier filter circuit;
Control circuit part comprises receiving-end voltage current detection circuit, receiving terminal charge data transtation mission circuit, transmitting terminal receive data by wireless circuit, transmitting terminal current detection circuit, phase-locked loop frequency tracking circuit, PWM inverter control circuit, inverse changing driving circuit;
Input ac voltage converts galvanic current pressure Ud1 to through full-bridge rectification filter circuit, exports high-frequency ac voltage U1 through half-bridge inversion circuit, produces resonance potential and resonance current and launching circuit resonance current i1 in transmitting terminal series resonant circuit; The resonance frequency of receiving terminal series resonant circuit and transmitting terminal series resonant circuit is equal, receiving loop output voltage U2 is produced by electromagnetic coupled resonance, receiving loop output voltage U2 is transformed into and exports high frequency voltage corresponding to charging voltage Uo through high frequency transformer T1, carry out rectification and filtering through rectifier filter circuit, export charging voltage Uo;
Receiving-end voltage current detection circuit detects charging voltage and the charging current of receiving terminal output, and charging voltage and charging current data are through receiving terminal charge data transtation mission circuit wireless transmission subsequently; Transmitting terminal receive data by wireless circuit receives and sends the charging voltage received and charging current data to PWM inverter control circuit; Launching circuit resonance current, by after transmitting terminal current detection circuit acquisition testing, produces frequency-tracking signal, to PWM inverter control circuit through phase-locked loop frequency tracking circuit; PWM inverter control circuit is according to the charging voltage set-point set, charging voltage and charging current detected value and frequency-tracking signal, produce the PWM pulse-width modulation control signal of respective frequencies and pulse duration, carry out isolating and power amplification through inverse changing driving circuit, export driving pulse Ug1 and Ug2, control the switching tube in half-bridge inversion circuit;
A work period of main circuit during PWM control impuls width adjusting is as follows:
T1-t2, the t1 moment, phase-locked loop frequency tracking circuit detects launching circuit resonance current i1 zero crossing, PWM inverter control circuit, according to i1 crossover point signal, sends inversion drive singal Ug1=high level by inverse changing driving circuit, makes VT1 conducting, VT2 continues to turn off, half-bridge inversion circuit output voltage U1 is just, its amplitude is Ud1, and launching circuit resonance current i1 rises; Receiving loop output voltage U2 and receiving loop resonance current i2 follows U1 and i1 change;
In t2-t3, the t2 moment, PWM inverter control circuit compares according to charging voltage set-point Vg and charging voltage detected value Vo, as Vg=Vo, send inversion by inverse changing driving circuit and drive cut-off signals Ug1=0, VT1 is turned off, VT2 continues to turn off simultaneously, enters Dead Time;
In t3-t4, the t3 moment, Dead Time terminates, PWM inverter control circuit sends inversion drive singal Ug2=high level by inverse changing driving circuit, makes VT2 conducting, and VT1 continues to turn off, half-bridge inversion circuit enters inner loop stream mode, U1=0, and launching circuit resonance current i1 declines; Drop to before zero at i1, the first conducting of anti-paralleled diode VD2 of VT2, drops to after zero at i1, VT2 conducting; Receiving loop output voltage U2 and receiving loop resonance current i2 follows U1 and i1 change;
T4-t5, the t4 moment, before phase-locked loop frequency tracking circuit detects that launching circuit resonance current i1 gets back to zero crossing, PWM inverter control circuit is according to the current signal before i1 zero passage, send inversion by inverse changing driving circuit and drive cut-off signals Ug2=0, VT2 is turned off, and VT1 continues to turn off simultaneously, enters Dead Time; A work period of t1-t5 stage terminates.
2. electric bicycle magnet coupled resonant type wireless charger as claimed in claim 1, is characterized in that:
Described full-bridge rectification filter circuit comprises diode D1 ~ D4 and filter capacitor Cd1, and diode D1 ~ D4 forms an input full bridge rectifier, and filter capacitor Cd1 is connected in parallel on two outputs of input full bridge rectifier;
Described half-bridge inversion circuit comprises MOS switching tube VT1, VT2 and anti-paralleled diode VD1, VD2; Described transmitting terminal series resonant circuit comprises resonant capacitance C1 and the transmitting coil L1 of series connection; The grid of switching tube VT1, VT2 meets driving pulse Ug1 and Ug2 respectively, and the drain electrode of switching tube VT1 connects the positive output end of input full bridge rectifier, and source electrode connects the drain electrode of switching tube VT2, and the source electrode of switching tube VT2 connects the negative output terminal of input full bridge rectifier; The negative electrode of diode VD1 and anode connect drain electrode and the source electrode of switching tube VT1 respectively; The negative electrode of diode VD2 and anode connect drain electrode and the source electrode of switching tube VT2 respectively;
The drain node that is connected of switching tube VT1 source electrode and switching tube VT2 connects one end of transmitting terminal series resonant circuit, the negative output terminal of another termination input full bridge rectifier of transmitting terminal series resonant circuit.
3. electric bicycle magnet coupled resonant type wireless charger as claimed in claim 2, is characterized in that:
Described receiving terminal series resonant circuit comprises resonant capacitance C2 and the receiving coil L2 of series connection; The two ends of series resonant circuit are connected with the elementary two ends of high frequency transformer T1 respectively;
The value of resonant capacitance C1 and transmitting coil L1, and the value of resonant capacitance C2 and receiving coil L2 makes the resonance frequency of receiving terminal series resonant circuit and transmitting terminal series resonant circuit equal, and resonance frequency is less than 200KHz.
4. electric bicycle magnet coupled resonant type wireless charger as claimed in claim 3, it is characterized in that: described rectifier filter circuit comprises diode Dr1 ~ Dr4 and filter capacitor Cd2, diode Dr1 ~ Dr4 forms high frequency full bridge rectifier, the secondary two ends of the input termination high frequency transformer T1 of this high frequency full bridge rectifier, filter capacitor Cd2 is connected in parallel on two outputs of this high frequency full bridge rectifier.
5. electric bicycle magnet coupled resonant type wireless charger as claimed in claim 4, is characterized in that:
Described receiving-end voltage current detection circuit, comprises direct current voltage sensor V2 and DC current sensor A2, exports charging voltage and charging current for detecting; Direct current voltage sensor V2 is connected in parallel on two outputs of high frequency full bridge rectifier, and DC current sensor A2 is arranged on an output of high frequency full bridge rectifier.
6. electric bicycle magnet coupled resonant type wireless charger as claimed in claim 5, is characterized in that:
Described receiving terminal charge data transtation mission circuit is used for charging voltage and charging current data to be wirelessly transmitted in transmitting terminal receive data by wireless circuit; Transmitting terminal receive data by wireless circuit is for receiving charging voltage and charging current data and sending PWM inverter control circuit to.
7. electric bicycle magnet coupled resonant type wireless charger as claimed in claim 6, is characterized in that:
Described transmitting terminal current detection circuit comprises current sensor A1, for detecting electric current and the launching circuit resonance current i1 of transmitting terminal series resonant circuit.
8. electric bicycle magnet coupled resonant type wireless charger as claimed in claim 7, is characterized in that:
Described phase-locked loop frequency tracking circuit, is provided for launching circuit resonance current i1 and follows the tracks of launching circuit resonance potential, keep launching circuit resonance current i1 delayed launching circuit resonance potential phase angle.
9. electric bicycle magnet coupled resonant type wireless charger as claimed in claim 8, is characterized in that:
Described PWM inverter control circuit is used for, according to the charging voltage set-point set, charging voltage and charging current detected value and frequency-tracking signal, producing the PWM pulse-width modulation control signal of respective frequencies and pulse duration, being supplied to inverse changing driving circuit;
Described inverse changing driving circuit is used for PWM pulse-width modulation control signal to carry out isolating, voltage and current amplifies, and drives switching tube VT1 and VT2 in half-bridge inversion circuit.
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| CN201410002988.5A CN103779951B (en) | 2014-01-03 | 2014-01-03 | Electric bicycle magnet coupled resonant type wireless charger |
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| CN201410002988.5A CN103779951B (en) | 2014-01-03 | 2014-01-03 | Electric bicycle magnet coupled resonant type wireless charger |
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