CN111092496B - Magnetic coupling resonant wireless charging transmitting circuit and wireless charging transmitting device - Google Patents

Magnetic coupling resonant wireless charging transmitting circuit and wireless charging transmitting device Download PDF

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Publication number
CN111092496B
CN111092496B CN201910745394.6A CN201910745394A CN111092496B CN 111092496 B CN111092496 B CN 111092496B CN 201910745394 A CN201910745394 A CN 201910745394A CN 111092496 B CN111092496 B CN 111092496B
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circuit
mosfet
electrically connected
current
resistor
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CN111092496A (en
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李阳春
张兴
吕晓飞
李鹏
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Zhejiang Huayun Information Technology Co Ltd
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Zhejiang Huayun Information Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

Abstract

The invention discloses a magnetic coupling resonant wireless charging transmitting circuit and a wireless charging transmitting device, comprising a full-bridge inverter circuit, a current sampling circuit, an operational amplifier circuit, an oscillating circuit, a converting circuit, a delay circuit and a comparison circuit; an output of full-bridge inverter circuit is connected with a sample terminal of electric current sampling circuit, another output of full-bridge inverter circuit is connected with another sample terminal of electric current sampling circuit through the oscillating circuit, and the output of electric current sampling circuit is connected with the input electricity of converting circuit and fortune amplifier circuit respectively, and the input of comparison circuit is connected with the output electricity of converting circuit and fortune amplifier circuit, the comparison circuit output is connected with delay circuit's input electricity, and delay circuit's output full-bridge inverter circuit's drive end electricity is connected. According to the technical scheme, the resonant circuit is controlled by simplifying hardware design without MCU control, and application cost is saved.

Description

Magnetic coupling resonant wireless charging transmitting circuit and wireless charging transmitting device
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a magnetic coupling resonant wireless charging transmitting circuit and a wireless charging transmitting device.
Background
The wireless charging can get rid of the constraint of a metal wire, and the transmission range of electric energy is expanded; the method has the advantages of safety, reliability, convenience, flexibility and the like. Magnetic coupling type wireless charging is one implementation mode of a plurality of wireless charging modes. The magnetic coupling resonance type wireless charging can meet the wireless energy transmission of the distance from cm to m, and has wide application prospect.
The high-frequency power driving circuit of the prior magnetic coupling type wireless charging transmitting terminal is basically realized by three modes; the first method is to amplify the power of small signals to drive the primary LC circuit of the transformer to resonate; the second is realized by adopting a power electronic device through a half-bridge or full-bridge inverter circuit; the third is to use a self-oscillating power circuit to drive the LC.
The existing second resonant type transmitting circuit has the following problems:
1. whether a half-bridge or a full-bridge, there is switching loss of a switching device such as a MOSFET;
2. the frequency adjustment function, some protection functions and the start control basically need the MCU to participate in the control, so that the cost is increased;
3. a frequency generating device is required.
Disclosure of Invention
The invention aims to solve the problems of overhigh design cost and complex circuit of the existing wireless charging transmitting terminal, and designs a magnetic coupling resonant wireless charging transmitting circuit and a wireless charging transmitting device.
In order to achieve the technical purpose, the invention provides a technical scheme that the magnetic coupling resonant wireless charging transmitting circuit comprises a power input interface electrically connected with a power adapter, a full-bridge inverter circuit, a current sampling circuit, an operational amplifier circuit, an oscillator circuit, a conversion circuit, a delay circuit and a comparison circuit; the power input end of the full-bridge inverter circuit is connected with the power input interface, one output end of the full-bridge inverter circuit is electrically connected with one sampling end of the current sampling circuit, the other output end of the full-bridge inverter circuit is electrically connected with the other sampling end of the current sampling circuit through the oscillating circuit, one output end of the current sampling circuit is electrically connected with the input end of the conversion circuit, the other output end of the current sampling circuit is electrically connected with the input end of the operational amplifier circuit, one input end of the comparison circuit is electrically connected with the output end of the conversion circuit, the other input end of the comparison circuit is electrically connected with the output end of the operational amplifier circuit, one output end of the comparison circuit is electrically connected with the input end of the delay circuit, the other output end of the comparison circuit is electrically connected with the driving end of the full-bridge inverter circuit, and the output end of the delay circuit is electrically connected with the driving end of the full-bridge inverter circuit.
As preferred, full-bridge inverter circuit include full-bridge inverter power circuit and the MOSFET pipe drive circuit that the MOSFET pipe constitutes, full-bridge inverter power circuit's power input end and power input interface connection, an output of full-bridge inverter power circuit is connected with an input electricity of current sampling circuit, another output of full-bridge inverter power circuit is connected with another input electricity of current sampling circuit through the oscillating circuit, MOSFET pipe drive circuit's input is connected with delay circuit's output and amplifier circuit's an output electricity respectively, MOSFET pipe drive circuit's output and MOSFET pipe's control end electricity are connected.
Preferably, the current sampling circuit comprises a first current sampling circuit and a second current sampling circuit, the input ends of the first current sampling circuit and the second current sampling circuit are connected in series, the input end of the first current sampling circuit is electrically connected with one output end of the full-bridge inverter power circuit, the input end of the second current sampling circuit is electrically connected with the output end of the filter circuit, the output end of the first current sampling circuit is electrically connected with the input end of the operational amplifier circuit, and the output end of the second current sampling circuit is electrically connected with the input end of the full-bridge rectifier circuit.
Preferably, the current sampling circuit comprises a first current sampling circuit and a second current sampling circuit, the input ends of the first current sampling circuit and the second current sampling circuit are connected in series, the input end of the first current sampling circuit is electrically connected with one output end of the full-bridge inverter power circuit, the input end of the second current sampling circuit is electrically connected with the output end of the oscillating circuit, the output end of the first current sampling circuit is electrically connected with the input end of the operational amplifier circuit, and the output end of the second current sampling circuit is electrically connected with the input end of the conversion circuit.
Preferably, the conversion circuit comprises a full-bridge rectification circuit and a filter circuit, wherein the input end of the filter circuit is electrically connected with the output end of the second current sampling circuit, the output end of the filter circuit is electrically connected with the input end of the full-bridge rectification circuit, and the output end of the full-bridge rectification circuit is electrically connected with the input end of the comparison circuit.
Preferably, the comparison circuit comprises a first comparison circuit and a second comparison circuit, wherein the input end of the first comparison circuit is electrically connected with the output end of the amplification circuit, and the output end of the first comparison circuit is electrically connected with the input end of the MOSFET driving circuit; the input end of the second comparison circuit is electrically connected with the output end of the filter circuit, the output end of the second comparison circuit is electrically connected with the input end of the delay circuit, and the output end of the delay circuit is electrically connected with the input end of the MOSFET tube driving circuit.
Preferably, the drive circuit of the MOSFET includes two integrated IC chips that realize complementary conduction of the drive signal through an inverter circuit.
Preferably, each of the first current sampling circuit and the second current sampling circuit includes a high-frequency current transformer and a secondary-side load resistor, a primary coil of the high-frequency current transformer of the first current sampling circuit is connected in series with a primary coil of the high-frequency current transformer of the second current sampling circuit, and the secondary-side load resistor is connected in parallel with a secondary coil of the high-frequency current transformer.
Preferably, the wireless charging and transmitting circuit comprises a transmitting board, and the transmitting board comprises the magnetic coupling resonant wireless charging and transmitting circuit.
The invention has the beneficial effects that:
setting a fixed value: the over-current detection voltage comparison circuit can set the peak value of the emission current by adjusting the resistance value of the resistor; when the resonant current exceeds the working threshold, stopping supplying energy to the resonant circuit;
the circuit is simplified, and the cost is lower: the MCU is not used for logic control, so that the cost is effectively reduced, and a logic control circuit is simplified;
automatic frequency tracking: the circuit can automatically adjust the driving frequency according to the resonance frequency change caused by the change of the magnetic coupling resonance type wireless charging load, track the resonance point and improve the transmission efficiency;
zero current soft switching: the full-bridge inverted MOSFETs realize zero-current switching, so that the switching loss is reduced;
the power-on is automatically started without a frequency generation device: after the circuit is powered on, the circuit can be automatically started and acquires the current resonant frequency without additionally designing a frequency generating device.
Drawings
Fig. 1 is a schematic structural diagram of a magnetic coupling resonant wireless charging and transmitting circuit according to this embodiment.
Fig. 2 is a schematic diagram of a magnetic coupling resonant wireless charging and transmitting circuit according to this embodiment.
Fig. 3 is a schematic diagram of a wireless charging device according to an embodiment of the invention.
The notation in the figure is: the circuit comprises a 1-full-bridge inverter circuit, a 2-current sampling circuit, a 3-operational amplifier circuit, a 4-conversion circuit, a 5-comparison circuit, a 6-time delay circuit, a 7-adapter, an 8-oscillator circuit, a 11-full-bridge inverter power circuit, a 12-MOSFET driving circuit, a 21-first current sampling circuit, a 22-second current sampling circuit, a 31-addition circuit, a 32-amplification circuit, a 41-full-bridge rectifier circuit, a 42-filter circuit, a 51-first comparison circuit and a 52-second comparison circuit.
Detailed Description
For the purpose of better understanding the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention with reference to the accompanying drawings and examples should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and not for limiting the scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the scope of the present invention.
Example (b): as shown in fig. 1, it is a structure diagram of a magnetic coupling resonant wireless charging and transmitting circuit, which comprises a full bridge inverter circuit 1, a current sampling circuit 2, an operational amplifier circuit 3, a filter circuit 42, an oscillator circuit 8, a converting circuit 4, a delay circuit 6 and a comparison circuit 5, wherein the full bridge inverter circuit 1 comprises a full bridge inverter power circuit 11 and a MOSFET driving circuit 12, the current sampling circuit 2 comprises a first current sampling circuit 21 and a second current sampling circuit 22, the operational amplifier circuit 3 comprises an adder circuit 31 and an amplifier circuit 32, the comparison circuit 5 comprises a first comparison circuit 51 and a second comparison circuit 52, the converting circuit 4 comprises a full bridge rectifier circuit 41 and a filter circuit 42, an external power supply supplies power to the wireless charging and transmitting device through an adapter 7, one output terminal of the full bridge inverter power circuit 11 is electrically connected with an input terminal of the first current sampling circuit 21, the other output end of the full-bridge inverter power circuit 11 is electrically connected with the input end of the second current sampling circuit 22 through the oscillator circuit 8, the control end of the full-bridge inverter power circuit 11 is electrically connected with the output end of the MOSFET driving circuit 12, the output end of the first sampling circuit is electrically connected with the input end of the adder circuit 31, the output end of the adder circuit 31 is electrically connected with the input end of the amplifier circuit 32, the output end of the amplifier circuit 32 is electrically connected with the input end of the first comparator circuit 51, the output end of the first amplifier circuit 32 is electrically connected with the input end of the MOSFET driving circuit 12, the output end of the second current sampling circuit 22 is electrically connected with the input end of the full-bridge rectifier circuit 41, the output end of the full-bridge rectifier circuit 41 is electrically connected with the input end of the filter circuit 42, the output end of the filter circuit 42 is electrically connected with the input end of the second, the output end of the delay circuit 6 is electrically connected with the input end of the MOSFET tube driving circuit 12.
Fig. 2 shows a schematic diagram of a magnetic coupling resonant wireless charging and transmitting circuit, which is a full bridge inverter power circuit 11 composed of four MOSFET tubes Q1, Q2, Q3 and Q4, a MOSFET driving circuit is composed of two integrated IC chips that realize complementary conduction of driving signals through an inverter circuit, a control terminal of one integrated IC chip is electrically connected with gates of the MOSFET tube Q1 and the MOSFET tube Q4, a control terminal of the other integrated IC chip is electrically connected with gates of the MOSFET tube Q2 and the MOSFET tube Q3, a first current sampling circuit 21 is composed of a high frequency current transformer CT1 and secondary side load resistors R5 and R12, a second current sampling circuit 22 is composed of a high frequency current transformer CT2 and secondary side load resistors R31 and R37, an oscillation circuit 8 is composed of a capacitor CX1 and an inductor L1, a fourth pin of a current transformer CT1 is electrically connected with a source of the MOSFET tube Q1, a third pin of the current transformer 2 is electrically connected with a source of the MOSFET tube CX1 through an inductor L1 and a capacitor Q2, the third electrical pin of the current transformer CT1 is electrically connected to the fourth electrical pin of the current transformer CT2, the first end of the resistor R5 is electrically connected to the first electrical pin of the current transformer CT1, the second end of the resistor R5 is electrically connected to the first end of the resistor R12, the second end of the resistor R12 is electrically connected to the first end of the resistor R16, the second end of the resistor R16 is electrically connected to the third electrical pin of the adder U2, the fourth electrical pin of the adder U2 is electrically connected to the first electrical pin of the adder U2 through the resistor R4, the first electrical pin of the adder U2 is electrically connected to the third electrical pin of the amplifier U1 through the resistor R10, the fourth electrical pin of the amplifier U1 is electrically connected to the first electrical pin of the amplifier U1 through the resistor R3, the first electrical pin of the amplifier U1 is electrically connected to the fourth electrical pin of the comparator U1 through the resistor R1, and the third electrical pin of the comparator U1 is electrically connected to the first input terminal of the MOSFET integrated circuit IC 1 and the first set of the MOSFET driving circuit IC 1.
A first electrical pin of the high-frequency current transformer CT2 is electrically connected with a second electrical pin of the high-frequency current transformer CT2 through a resistor R31 and a resistor R37, the first electrical pin of the high-frequency current transformer CT2 is electrically connected with an anode terminal of a diode D4 of the full-bridge rectifier circuit 41, a second electrical pin of the high-frequency current transformer CT2 is electrically connected with an anode terminal of a diode D3 of the full-bridge rectifier circuit 41, a cathode terminal of a diode D3 of the full-bridge rectifier circuit 41 is electrically connected with an anode terminal of a diode D7 of the full-bridge rectifier circuit 41 through a resistor R23 and a resistor R29, a first end of a resistor R23 is electrically connected with a first end of a resistor R21, a second end of a resistor R21 is electrically connected with a capacitor C11 and grounded, a first end of a capacitor C11 is electrically connected with a fourth electrical pin of a comparator U4 through a resistor R24, a third electrical pin of a comparator U4 is electrically connected with a first electrical pin of a comparator U22, a first electrical pin of the comparator U4 is electrically connected with a chip of the resistor R4 and, the fifth pin of the delay chip U5 is electrically connected to the sixth pin of the delay chip U5 through a capacitor C16 and a capacitor C15, the sixth pin of the delay chip U5 is shorted with the seventh pin of the delay chip U5, the seventh pin of the delay chip U5 is electrically connected to the eighth pin of the delay chip U5 through a resistor R33, the eighth pin of the delay chip U5 is electrically connected to the first end of the capacitor C13, the second end of the capacitor C13 is electrically connected to the second end of the capacitor C15, the first end of the capacitor C13 is electrically connected to the first end of the capacitor C14, the second end of the capacitor C14 is electrically connected to the second end of the capacitor C13 and grounded, the first end of the capacitor C14 is connected to VCC, and the third pin of the delay chip U5 is electrically connected to the input end of another integrated IC chip of the MOSFET driving circuit 12.
The specific implementation of the schematic diagram of the magnetic coupling resonant wireless charging and transmitting circuit shown in fig. 2 is as follows:
FIG. 3 is a schematic diagram of a wireless charging device of the present invention, which comprises a transmitting plate and a coil LSAnd a receiving plate, a load resistor RL and a coil LRAnd (4) forming. The circuit principle of the transmitting board is applicable to a magnetic coupling resonant wireless charging transmitting circuit principle diagram as shown in fig. 2, after the transmitting board is powered on, the output end DR of the first comparison circuit 51 is in an initial state1Is at high level, and after passing through MOSFET integrated drive circuit, MOSFET tube Q2And MOSFET Q3With the gate level set high, MOSFET transistor Q1And MOSFET Q4Is set low, at which time the MOSFET transistor causes Q to go2And MOSFET Q3Conducting, MOSFET tube Q1MOSFET Q4Stopping; thus, a current flows through the capacitor CX1 and the coil L1, and a free resonance process is started. High-frequency current transformer CT1The sampled resonant current signal is provided by an adder U2The composed adding circuit 31 superimposes a VREFThe dc level of (d); then via an amplifier U1An amplifying circuit 32 composed of operational amplifiers, and an adder U2Amplifying the output alternating current signal; adder U2The amplified signal is fed to a comparator U3The comparison circuit composed of the operational amplifier drives the signal DR when the current signal crosses zero (rises)1And (5) lowering. DR (digital radiography)1After being set at the bottom, the integrated drive circuit of the MOSFET enables the MOSFET Q2And MOSFET Q3With gate level set low, MOSFET transistor Q1And MOSFET Q4The gate level is set high, at which time the MOSFET Q is turned on2And MOSFET Q3Cut-off, MOSFET tube Q1And MOSFET Q4Conducting; thus, the capacitance CX1 and the coil L1 are reversed by the current and re-enter the resonance state, and the signal DR is re-sent when the resonance current crosses zero (falls) again1And (5) setting the height. Therefore, the automatic starting of the transmitting plate and the switching of the MOSFET at the zero crossing point of the resonant current are realized, and the soft switching of the MOSFET is realized. When the load resistance RLOr a receiving coil LRAnd a transmitting coil LSWhen the distance D of (a) is changed, the frequency of the resonant circuitThe frequency can change, and the switching frequency of the MOSFET can be adjusted and changed along with the change of the resonant frequency, so that the frequency tracking function is realized.
The peak value of the resonant current is larger and larger after a plurality of resonant cycles, and the current needs to be limited within a certain range; high-frequency current transformer CT2The sampled resonant current is rectified by a full bridge, filtered by an RC filter circuit 42 and sent to a comparator U4The comparator circuit is composed of a comparator U when the current peak value exceeds a set threshold value4The high level of the output is changed into low level and passes through a time delay unit U5The high level of OH output by the formed delay unit is inverted to convert DR1Pulled low so that the MOSFET Q1And MOSFET Q4Keep on, MOSFET tube Q2And MOSFET Q3Keeping the cut; when the resonance current is lower than the set threshold value, OH is delayed for a period of time DeltaT and then returns to the low level. After the time delta T, the resonant current is reduced; the circuit is restored to the process of gradually increasing the resonant current, so that the resonant current is limited within a certain range, the overcurrent protection function is realized, and the resistor R is adjusted28And a resistance R30The value of (d) can set the maximum resonant current value of the emitter plate.
The above-mentioned embodiments are preferred embodiments of the magnetic coupling resonant wireless charging/transmitting circuit and the wireless charging/transmitting device of the present invention, and the scope of the present invention is not limited thereto, and all equivalent changes in shape and structure according to the present invention are within the protection scope of the present invention.

Claims (2)

1. A magnetic coupling resonant wireless charging transmitting circuit comprises a power input interface electrically connected with a power adapter, and is characterized in that:
the circuit also comprises a full-bridge inverter circuit, a current sampling circuit, an operational amplifier circuit, an oscillation circuit, a conversion circuit, a delay circuit and a comparison circuit; the power input end of the full-bridge inverter circuit is connected with the power input interface, one output end of the full-bridge inverter circuit is electrically connected with one sampling end of the current sampling circuit, the other output end of the full-bridge inverter circuit is electrically connected with the other sampling end of the current sampling circuit through the oscillating circuit, one output end of the current sampling circuit is electrically connected with the input end of the conversion circuit, the other output end of the current sampling circuit is electrically connected with the input end of the operational amplifier circuit, one input end of the comparison circuit is electrically connected with the output end of the conversion circuit, the other input end of the comparison circuit is electrically connected with the output end of the operational amplifier circuit, one output end of the comparison circuit is electrically connected with the input end of the delay circuit, the other output end of the comparison circuit is electrically connected with the driving end of the full-bridge inverter circuit, and the output end of the delay circuit is electrically connected with the driving end of the full-bridge inverter circuit;
a magnetic coupling resonance type wireless charging transmitting circuit comprises a full bridge inverter power circuit consisting of four MOSFET tubes Q1, Q2, Q3 and Q4, a drive circuit of the MOSFET comprises two integrated IC chips which realize complementary conduction of drive signals through an inverter circuit, the control end of one integrated IC chip is electrically connected with the grids of the MOSFET tube Q1 and the MOSFET tube Q4, the control end of the other integrated IC chip is electrically connected with the grids of the MOSFET tube Q2 and the MOSFET tube Q3, a first current sampling circuit consists of a high-frequency current transformer CT1 and secondary side load resistors R5 and R12, a second current sampling circuit consists of a high-frequency current transformer CT2 and secondary side load resistors R31 and R37, an oscillation circuit consists of a capacitor CX1 and an inductor L1, the fourth pin of the current transformer CT1 is electrically connected with the source electrode of the MOSFET tube Q1, the third pin of the current transformer 2 is electrically connected with the source electrode CX 2 of the MOSFET tube Q1 and the capacitor L1, the third electrical pin of the current transformer CT1 is electrically connected to the fourth electrical pin of the current transformer CT2, the first end of the resistor R5 is electrically connected to the first electrical pin of the current transformer CT1, the second end of the resistor R5 is electrically connected to the first end of the resistor R12, the second end of the resistor R12 is electrically connected to the first end of the resistor R16, the second end of the resistor R16 is electrically connected to the third electrical pin of the adder U2, the fourth electrical pin of the adder U2 is electrically connected to the first electrical pin of the adder U2 through the resistor R4, the first electrical pin of the adder U2 is electrically connected to the third electrical pin of the amplifier U1 through the resistor R10, the fourth electrical pin of the amplifier U1 is electrically connected to the first electrical pin of the amplifier U1 through the resistor R3, the first electrical pin of the amplifier U1 is electrically connected to the fourth electrical pin of the comparator U1 through the resistor R1, and the third electrical pin of the comparator U1 is electrically connected to the first input terminal of the MOSFET integrated circuit IC 3612;
the wireless charging transmitter suitable for magnetic coupling resonant wireless charging transmitter circuit comprises a transmitting plate and a coil LSAnd a receiving plate, a load resistor RL and a coil LRComposition is carried out; the frequency tracking function and the over-current protection function embodied by the circuit structure are realized by the following logic control principles:
after the emitting panel is powered on, the output end DR1 of the first comparison circuit in an initial state is at a high level, after the MOSFET integrated drive circuit passes through, the grid levels of the MOSFET tube Q2 and the MOSFET tube Q3 are set high, the grid levels of the MOSFET tube Q1 and the MOSFET tube Q4 are set low, at the moment, the MOSFET tube enables the Q2 and the MOSFET tube Q3 to be conducted, and the MOSFET tube Q1 and the MOSFET tube Q4 are cut off; thus, the capacitor CX1 and the coil L1 have current flowing through them, and start the free resonance process;
a resonance current signal sampled by the high-frequency current transformer CT1 is superposed with a direct current level of VREF by an adding circuit consisting of an adder U2; an amplifying circuit composed of an amplifier U1 operational amplifier amplifies the alternating current signal output by the adder U2; the signal amplified by the adder U2 is compared with a comparison circuit consisting of a comparator U3 operational amplifier, and the driving signal DR1 is set to be low when the current signal passes through zero;
after DR1 is set at the bottom, the integrated drive circuit of the MOSFET makes the gate levels of the MOSFET Q2 and the MOSFET Q3 set low, and the gate levels of the MOSFET Q1 and the MOSFET Q4 set high, at this time, the MOSFET Q2 and the MOSFET Q3 are cut off, and the MOSFET Q1 and the MOSFET Q4 are conducted; thus, the capacitance CX1 and the coil L1 are reversed by the current and enter the resonance state again, and the signal DR1 is set high again when the resonance current passes through zero; therefore, the automatic starting of the transmitting plate and the switching of the MOSFET at the zero crossing point of the resonant current are realized, and the soft switching of the MOSFET is realized;
when the load resistance RL or the distance D between the receiving coil LR and the transmitting coil LS changes, the frequency of the resonant circuit changes, and the switching frequency of the MOSFET changes along with the change of the resonant frequency, so that the frequency tracking function is realized;
the peak value of the resonant current is larger and larger after a plurality of resonant cycles, and the current needs to be limited within a certain range; high-frequency current transformer CT2The sampling resonance current is rectified by a full bridge and filtered by an RC filter circuit to a comparator U4The comparator circuit is composed of a comparator U when the current peak value exceeds a set threshold value4The high level of the output is changed into low level and passes through a time delay unit U5The high level of OH output by the formed delay unit is inverted to convert DR1Pulled low so that the MOSFET Q1And MOSFET Q4Keep on, MOSFET tube Q2And MOSFET Q3Keeping the cut; when the resonant current is lower than a set threshold value, OH is delayed for a period of time delta T and then is restored to a low level;
after the time delta T, the resonant current is reduced; the circuit is restored to the process of gradually increasing the resonant current, so that the resonant current is limited within a certain range, the overcurrent protection function is realized, and the resistor R is adjusted28And a resistance R30The value of (d) can set the maximum resonant current value of the emitter plate.
2. A wireless emitter that charges which characterized in that:
comprises a transmitting board which comprises the magnetic coupling resonance type wireless charging transmitting circuit as claimed in claim 1.
CN201910745394.6A 2019-08-13 2019-08-13 Magnetic coupling resonant wireless charging transmitting circuit and wireless charging transmitting device Active CN111092496B (en)

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KR100553293B1 (en) * 1999-02-02 2006-02-22 로크웰삼성오토메이션 주식회사 An apparatus for eliminating variable offset values of current detecting signals and its method
CN101127490A (en) * 2006-03-21 2008-02-20 上海恒精机电设备有限公司 A high power transistor frequency conversion power supply
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