CN111211623B - Transmitting circuit applied to wireless energy transmission system and control method - Google Patents
Transmitting circuit applied to wireless energy transmission system and control method Download PDFInfo
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- CN111211623B CN111211623B CN202010076124.3A CN202010076124A CN111211623B CN 111211623 B CN111211623 B CN 111211623B CN 202010076124 A CN202010076124 A CN 202010076124A CN 111211623 B CN111211623 B CN 111211623B
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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
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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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention provides a transmitting circuit and a control method applied to a wireless energy transmission system, wherein the transmitting circuit comprises a ground input port GND and a power input port VDD, and the circuit also comprises a ramp signal generating circuit, a sampling circuit, an amplifier and envelope detection circuit, a non-overlapping signal generating circuit and a driving circuit; the ramp signal generating circuit generates a ramp voltage signal VRAMP, the sampling circuit, the amplifier and the envelope detection circuit generate a final sampling voltage signal VSEN, the input signal of the non-overlapping signal generating circuit is the final sampling voltage signal VSEN and the ramp voltage signal VRAMP, and the non-overlapping signal generating circuit outputs a driving signal to the driving circuit. The invention can realize that the transmitting power of the transmitting end is reduced when the power consumed by the circuit of the receiving end is reduced, and the transmitting power is increased when the power consumed by the circuit of the receiving end is increased, thereby improving the efficiency of the whole system.
Description
Technical Field
The invention relates to the field of special integrated circuit chip design, in particular to a transmitting circuit applied to a wireless energy transmission system and a control method, wherein the transmitting power of the transmitting circuit can be adaptively adjusted according to the power consumed by a circuit at a receiving end, so that the purpose of improving the power conversion efficiency of the wireless energy transmission system is achieved.
Background
The wireless energy transmission technology has the characteristics of charging at any time, no electrical contact, safety and reliability, and has wide prospects in the fields of portable equipment, biomedical devices, internet of things and the like. In the magnetic resonance type wireless energy transmission system, a transmitting end circuit provides alternating voltage which accords with the resonance frequency of a coil for a transmitting coil, so that the transmitting coil generates a magnetic field, a receiving coil resonates in the magnetic field and generates alternating current for supplying power to a receiving circuit, and wireless energy transmission is realized. In recent years, wireless energy transmission technology has been increasingly applied to the field of consumer electronics, especially smart phones, headphones, electric automobiles, and the like. With the emphasis on wireless energy transmission technology in recent years, the design and research of wireless energy transmission systems are increasing.
In wireless energy transmission systems, transmission efficiency is critical. The present research on transmission efficiency improvement mainly relates to improving the resonant coupling degree of coils to improve the transmission efficiency between coils or improving the circuit structure of a receiving end to improve the efficiency of a receiving end circuit.
Disclosure of Invention
The invention aims at: aiming at the problems existing in the prior art, the transmitting circuit and the control method applied to the wireless energy transmission system are provided, so that the transmitting power of the transmitting end can be reduced when the power consumed by the circuit of the receiving end is reduced, and the transmitting power can be increased when the power consumed by the circuit of the receiving end is increased, thereby improving the efficiency of the whole system. The specific method comprises the following steps: in the process of increasing the power consumed by the receiving end circuit, the power provided by the receiving coil is increased, the current in the transmitting coil is increased to a certain extent, according to the change, the current of the transmitting coil is sampled, the sampled current is amplified by an amplifier, then the sampled current is processed by an envelope detection circuit, a final sampled voltage signal related to the power consumed by the receiving end circuit is obtained, and then the final sampled voltage signal is compared with a ramp signal, so that the duty ratio related to the power consumed by the receiving end circuit is obtained.
The invention aims at realizing the following technical scheme:
the transmitting circuit applied to the wireless energy transmission system comprises a ground input port GND and a power input port VDD, and is characterized by further comprising a ramp signal generating circuit, a sampling circuit, an amplifier and envelope detection circuit, a non-overlapping signal generating circuit and a driving circuit; the ramp signal generating circuit generates a ramp voltage signal VRAMP, the sampling circuit, the amplifier and the envelope detection circuit generate a final sampling voltage signal VSEN, the input signal of the non-overlapping signal generating circuit is the final sampling voltage signal VSEN and the ramp voltage signal VRAMP, and the non-overlapping signal generating circuit outputs a driving signal to the driving circuit.
Further, the driving circuit includes a first AC signal output port AC1, a second AC signal output port AC2, a first driving buffer1, a second driving buffer2, a third driving buffer3, a fourth driving buffer4, a first transistor M1, a second transistor M2, a third transistor M3, and a fourth transistor M4, where the first AC signal output port AC1 is connected to the drain of the first transistor M1 and the drain of the third transistor M3, respectively; the second alternating current signal output port AC2 is respectively connected with the drain electrode of the second transistor M2 and the drain electrode of the fourth transistor M4; the output of the first driving buffer1 is connected with the grid electrode of the first transistor M1, the output of the second driving buffer2 is connected with the grid electrode of the second transistor M2, the output of the third driving buffer3 is connected with the grid electrode of the third transistor M3, and the output of the fourth driving buffer4 is connected with the grid electrode of the fourth transistor M4; the source of the first transistor M1 and the source of the second transistor M2 are both connected to the power supply input port VDD; the source of the third transistor M3 and the source of the fourth transistor M4 are both connected to the ground input port GND.
Further, the sampling circuit includes a sampling resistor R, a first amplifier AMP1, a fifth transistor M5, and a sixth transistor M6; an inverting input terminal of the first amplifier AMP1 is connected to the first alternating current signal output port AC1 of the driving circuit, and a non-inverting input terminal of the first amplifier AMP1 is connected to the drain of the sixth transistor M6; a gate of the fifth transistor M5 is connected to the output port of the first amplifier AMP 1; the gate of the sixth transistor M6 is connected to the gate of the third transistor M3 of the driving circuit; two ends of the sampling resistor R are respectively connected with the drain electrode of the fifth transistor M5 and the drain electrode of the sixth transistor M6; a source electrode of the fifth transistor M5 is connected to the power input port VDD; the source of the sixth transistor M6 is connected to the ground input port GND.
Further, the amplifier and envelope detection circuit comprises a second amplifier and an envelope detection circuit; the non-inverting input terminal of the second amplifier AMP2 is connected to the drain of the fifth transistor M5; an inverting input terminal of the second amplifier AMP2 is connected to the drain of the sixth transistor M6; the output of the second amplifier AMP2 is connected to the input of the envelope detection circuit; the output port of the envelope detection circuit is the final sampled voltage signal port VSEN.
Further, the non-overlapping signal generating circuit outputs a first driving signal QP1, a second driving signal QP2, a third driving signal QN1, and a fourth driving signal QN2 to drive the first driving buffer1, the second driving buffer2, the third driving buffer3, and the fourth driving buffer4, respectively; the duty ratio of the first driving signal QP1 signal and the third driving signal QN1 signal is lower than 50%, the duty ratio of the second driving signal QP2 signal and the fourth driving signal QN2 signal is higher than 50%, and in the process of increasing the duty ratio of the first driving signal QP1 signal and the third driving signal QN1 signal, the duty ratio of the second driving signal QP2 signal and the fourth driving signal QN2 signal is reduced so that the duty ratio of the entire driving signals approaches 50%.
A control method applied to a wireless energy transfer system, the method comprising: sampling a current signal of a driving circuit of the transmitting coil in a half period to obtain effective sampling current in the half period; the sampling current flows through the sampling resistor, and preliminary sampling voltages are generated at two ends of the sampling resistor, and voltage waveforms with certain envelopes are obtained after the preliminary sampling voltages are amplified; the voltage waveform with a certain envelope is input into an envelope detection circuit to obtain a final sampling voltage signal; comparing the final sampling voltage signal with a ramp voltage signal of a ramp signal generating circuit to obtain a preliminary duty ratio signal; the preliminary duty ratio signal is processed by non-overlapping logic of the non-overlapping signal circuit to generate a driving signal to drive the transmitting coil, so as to adjust driving power.
Compared with the prior art, the invention has the following advantages:
1. the transmitting circuit in the wireless energy transmission system adjusts the duty ratio by taking the current of the transmitting coil as a source of a reference signal, so as to adjust the power, so that the transmitting power of the transmitting end can be reduced when the power consumed by the circuit of the receiving end is reduced, and the transmitting power of the transmitting end is increased when the power consumed by the circuit of the receiving end is increased, and the efficiency of the transmitting circuit in the wireless energy transmission system is optimized;
2. the transmitting coil current can obtain related information through sampling the current on the power tube, and power information is transmitted from the receiving end circuit to the transmitting end circuit without adopting an additional method or device, so that the transmission of the power information is realized in a wireless energy transmission system formed by the traditional transmitting end circuit, the receiving end circuit and the coupling coil, the scale of the whole system is simplified, and the design difficulty is reduced;
3. the whole circuit does not need off-chip components, can accept certain process deviation, and is beneficial to the full integration of the transmitting circuit chip;
4. when the power consumed by the receiving end circuit is lower or no receiving end circuit exists, the duty ratio lower threshold of the driving signal can be set, so that the transmitting circuit works in a lower power consumption state, and the energy is saved while the normal working state of the receiving end circuit is ensured.
Drawings
Fig. 1 is a block diagram of a transmitting circuit of the present invention.
Fig. 2 is an overall system block diagram of the invention applied to a receiver circuit for wirelessly charging a lithium ion battery.
Fig. 3 is a circuit diagram of a second amplifier employed in the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Examples
Referring to fig. 2, the present invention is applied to a scheme of wirelessly charging a lithium ion battery as a receiving-end circuit, wherein the receiving-end circuit meets the charging requirement of the lithium ion battery, i.e. the charging phase is divided into a trickle charging phase, a constant-current charging phase and a constant-voltage charging phase. A trickle charge phase of lithium ion battery charging, wherein the charging current is much smaller than that of the constant current charging phase, so that the power required by the receiving end circuit is relatively lower than that required by the receiving end circuit in the constant current charging phase of lithium ion battery charging; in the constant voltage charging phase of lithium ion battery charging, the power required by the receiving-side circuit in the constant voltage charging phase is relatively low compared to the power required by the receiving-side circuit in the constant current charging phase of lithium ion battery charging due to the reduced charging current. In short, the receiving-end circuit at this time has power variation between different charging phases in addition to power variation in each phase, and in contrast, the power variation between different charging phases is relatively obvious, which is a main concern of the present embodiment.
Referring to fig. 1 and 2, the present invention provides a transmitting circuit applied to a wireless energy transmission system, which includes a ground input port GND, a power input port VDD, a ramp signal generating circuit, a sampling voltage signal generating circuit, a non-overlapping signal generating circuit, and a driving circuit; the ramp signal generating circuit generates a ramp voltage signal VRAMP, the sampling circuit, the amplifier and the envelope detection circuit generate a final sampling voltage signal VSEN, the input signal of the non-overlapping signal generating circuit is the final sampling voltage signal VSEN and the ramp voltage signal VRAMP, and the non-overlapping signal generating circuit outputs a driving signal to the driving circuit.
The driving circuit comprises a first alternating current signal output port AC1, a second alternating current signal output port AC2, a first driving buffer1, a second driving buffer2, a third driving buffer3, a fourth driving buffer4, a first transistor M1, a second transistor M2, a third transistor M3 and a fourth transistor M4, wherein the first alternating current signal output port AC1 is respectively connected with the drain electrode of the first transistor M1 and the drain electrode of the third transistor M3; the second alternating current signal output port AC2 is respectively connected with the drain electrode of the second transistor M2 and the drain electrode of the fourth transistor M4; the output of the first driving buffer1 is connected with the grid electrode of the first transistor M1, the output of the second driving buffer2 is connected with the grid electrode of the second transistor M2, the output of the third driving buffer3 is connected with the grid electrode of the third transistor M3, and the output of the fourth driving buffer4 is connected with the grid electrode of the fourth transistor M4; the source of the first transistor M1 and the source of the second transistor M2 are both connected to the power supply input port VDD; the source of the third transistor M3 and the source of the fourth transistor M4 are both connected to the ground input port GND.
The sampling circuit includes a sampling resistor R, a first amplifier AMP1, a fifth transistor M5, and a sixth transistor M6; an inverting input terminal of the first amplifier AMP1 is connected to the first alternating current signal output port AC1 of the driving circuit, and a non-inverting input terminal of the first amplifier AMP1 is connected to the drain of the sixth transistor M6; a gate of the fifth transistor M5 is connected to the output port of the first amplifier AMP 1; the gate of the sixth transistor M6 is connected to the gate of the third transistor M3 of the driving circuit; two ends of the sampling resistor R are respectively connected with the drain electrode of the fifth transistor M5 and the drain electrode of the sixth transistor M6; a source electrode of the fifth transistor M5 is connected to the power input port VDD; the source of the sixth transistor M6 is connected to the ground input port GND.
The amplifier and the envelope detection circuit comprise a second amplifier and an envelope detection circuit; the non-inverting input terminal of the second amplifier AMP2 is connected to the drain of the fifth transistor M5; an inverting input terminal of the second amplifier AMP2 is connected to the drain of the sixth transistor M6; the output of the second amplifier AMP2 is connected to the input of the envelope detection circuit; the output port of the envelope detection circuit is the final sampled voltage signal port VSEN.
The non-overlapping signal generating circuit outputs a first driving signal QP1, a second driving signal QP2, a third driving signal QN1 and a fourth driving signal QN2 to respectively drive a first driving buffer1, a second driving buffer2, a third driving buffer3 and a fourth driving buffer4; the duty ratio of the first driving signal QP1 signal and the third driving signal QN1 signal is lower than 50%, the duty ratio of the second driving signal QP2 signal and the fourth driving signal QN2 signal is higher than 50%, and in the process of increasing the duty ratio of the first driving signal QP1 signal and the third driving signal QN1 signal, the duty ratio of the second driving signal QP2 signal and the fourth driving signal QN2 signal is reduced so that the duty ratio of the entire driving signals approaches 50%.
The duty cycle of the driving signal is smaller when it is far from 50%, and the transmission power is gradually increased when it is gradually close to 50%. The transmitting circuit can be kept stable under different duty ratios according to the power change condition of the receiving end circuit, namely, when the power consumed by the receiving end circuit is stable, a sampling current value corresponding to the power consumed by the receiving end circuit exists, so that the receiving end circuit enters a stable working state when a transmitting system is regulated to the sampling current value, the consumed power is basically stable, the current in a transmitting coil is kept stable, and the sampling current, envelope voltage, final sampling voltage signals, duty ratios of driving signals and the like are kept unchanged, and the system enters a stable state.
If the power consumed by the receiving end is reduced under the condition of the coil series resonance, the power provided in the receiving coil becomes smaller, so that the current in the transmitting coil becomes smaller, and correspondingly, the currents of the first alternating current signal output port and the second alternating current signal output port in the driving circuit become smaller, and the currents of the first transistor to the fourth transistor become smaller. The current of the third transistor is mirrored by the sixth transistor, and the current is sampled to be smaller at the sixth transistor in real time. The sampling current flows through the sampling resistor to generate preliminary sampling voltage signals at two ends of the sampling resistor, the preliminary sampling voltage signals are input into the second amplifier for amplification, an envelope detection circuit is adopted to process the output result of the second amplifier, and finally, the final sampling voltage signals related to the sampling current change are obtained. Comparing the final sampling voltage signal with a ramp voltage signal of a ramp signal generating circuit to obtain a preliminary duty ratio signal, generating four driving signals after non-overlapping logic processing of a non-overlapping signal circuit, respectively inputting the four driving signals into a first driving buffer to a fourth driving buffer, respectively driving a first transistor to a fourth transistor by the first driving buffer to the fourth driving buffer, further driving a coil, and finally adjusting driving power.
The sampling current is effective in a half period, the other half period is close to 0mA, and the preliminary sampling voltage signal follows the variation range of the sampling current, so that the preliminary sampling voltage signal is input into the second amplifier for amplification, and the output result of the second amplifier is required to be filtered to remove ripples under the condition of not losing the variation of the sampling voltage, so that an envelope detection circuit is adopted to process the output result of the second amplifier, and finally, the final sampling voltage signal related to the variation of the sampling current is obtained.
The working procedure of this embodiment is as follows:
when the transmitting circuit is started, the driving duty ratio of the transmitting end is smaller by the lowest set direct current value of the slope voltage signal and the sampling voltage, the transmitting coil is driven, the transmitting coil generates a magnetic field, the receiving coil receives energy, the receiving end circuit starts to work, and the whole system starts to operate.
When the system works in the trickle charging stage of the lithium ion battery, as the initial receiving end circuit just starts to work, the power provided by the initial receiving end circuit is larger, the receiving end circuit is adjusted to smaller output current to meet the constant current charging requirement of the lithium ion battery, the power consumed by the receiving end circuit is reduced, the power provided by the receiving end circuit is reduced, the current in the transmitting coil is reduced to a smaller extent, and the conducting current in the first transistor to the fourth transistor in the transmitting circuit is reduced. In the half period, the transmitting circuit samples the current in the third transistor through the sampling circuit to obtain an effective sampling current in the half period, and the sampling current is reduced along with the current change in the third transistor. The sampling current flows through the sampling resistor, a preliminary sampling voltage signal is generated at two ends of the sampling resistor, a voltage waveform with a certain envelope is obtained after the preliminary sampling voltage signal is amplified by the second amplifier, the envelope voltage at the moment is related to the structure of the amplifier, when the voltage of the two ends of the input is reduced, the voltage of the output end is reduced, the envelope voltage is input into the envelope detection circuit, a final sampling voltage signal is obtained, and the final sampling voltage signal is reduced along with the change of the envelope voltage. Comparing the final sampling voltage signal with the slope voltage signal, wherein the moment when the final sampling voltage signal is larger than the slope voltage signal is the pulse width in the period, the duty ratio of the driving signal is gradually separated by 50% due to the reduction of the final sampling voltage signal, the output power of the transmitting circuit is reduced, and when the output power of the transmitting circuit is reduced to a certain moment, the receiving end circuit enters a stable working state, the consumed power is basically stable, the current in the transmitting coil is kept stable, and the sampling current, the envelope voltage, the final sampling voltage signal, the driving duty ratio and the like are kept unchanged, so that the system enters a stable working state.
During the system switching from the trickle charge phase of the lithium ion battery to the constant current charge phase of the lithium ion battery, the receiving side circuit tends to consume more power due to the need to maintain progressively more current since the previous receiving coil provides less power, which causes a smaller increase in current in the transmitting coil and therefore increases the on-current of the first transistor through the fourth transistor of the transmitting circuit. In the half period, the transmitting circuit samples the current in the third transistor through the sampling circuit to obtain effective sampling current in the half period, and the sampling current is increased along with the current change in the third transistor. The sampling current flows through the sampling resistor, a preliminary sampling voltage signal is generated at two ends of the sampling resistor, a voltage waveform with a certain envelope is obtained after the preliminary sampling voltage signal is amplified by the second amplifier, the envelope voltage at the moment is related to the structure of the amplifier, when the voltage of the two ends of the input is increased, the voltage of the output end is increased, the envelope voltage is input into the envelope detection circuit, a final sampling voltage signal is obtained, and the final sampling voltage signal is increased along with the change of the envelope voltage. Comparing the final sampling voltage signal with the slope voltage signal, wherein the moment that the final sampling voltage signal is larger than the slope jacking signal is the pulse width in the period, as the final sampling voltage signal is increased, the duty ratio of the driving signal is changed to 50%, the output power of the transmitting circuit is increased, and the output power of the transmitting circuit is increased to a certain moment, at the moment, the receiving end circuit enters a stable working state, the consumed power is basically stable, the current in the transmitting coil is kept stable, and the sampling current, the envelope voltage, the final sampling voltage signal, the driving duty ratio and the like are kept unchanged, so that the system enters the stable working state.
During the system switching from the constant current charging phase of the lithium ion battery to the constant voltage charging phase of the lithium ion battery, the receiving-side circuit tends to consume less power because the previous receiving coil provides more power, because a steady relatively small current is maintained, which results in a small reduction in the current in the transmitting coil, and therefore the on-current of the first transistor to the fourth transistor of the transmitting circuit decreases. In the half period, the transmitting circuit samples the current in the third transistor through the sampling circuit to obtain an effective sampling current in the half period, and the sampling current is reduced along with the current change in the third transistor. The sampling current flows through the sampling resistor, a preliminary sampling voltage signal is generated at two ends of the sampling resistor, a voltage waveform with a certain envelope is obtained after the preliminary sampling voltage signal is amplified by the second amplifier, the envelope voltage at the moment is related to the structure of the amplifier, when the voltage of the two ends of the input is reduced, the voltage of the output end is reduced, the envelope voltage is input into the envelope detection circuit, a final sampling voltage signal is obtained, and the final sampling voltage signal is reduced along with the change of the envelope voltage. Comparing the final sampling voltage signal with the ramp signal, wherein the moment when the final sampling voltage signal is larger than the ramp voltage signal is the pulse width in the period, the duty ratio of the driving signal is gradually separated by 50% due to the reduction of the final sampling voltage signal, the output power of the transmitting circuit is reduced to a certain moment, the power consumed by the receiving end circuit enters a stable working state basically and is stable, the current in the transmitting coil is kept stable, and the sampling current, the envelope voltage, the final sampling voltage signal, the driving duty ratio and the like are kept unchanged, so that the system enters a stable working state.
Referring to fig. 3, when the voltage difference between the input positive terminal INP and the input negative terminal INN of the second amplifier of the present invention becomes larger, the output voltage will increase; as the voltage difference between the input positive terminal INP and the input negative terminal INN becomes smaller, the output voltage will decrease. Namely, when the primary sampling voltage signals at two ends of the sampling resistor are increased, the output envelope voltage is increased; when the preliminary sampled voltage signal across the sampling resistor decreases, the output envelope voltage will decrease.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The transmitting circuit applied to the wireless energy transmission system comprises a ground input port GND and a power input port VDD, and is characterized by further comprising a ramp signal generating circuit, a sampling circuit, an amplifier and envelope detection circuit, a non-overlapping signal generating circuit and a driving circuit; the ramp signal generating circuit generates a ramp voltage signal VRAMP, the sampling circuit, the amplifier and the envelope detection circuit generate a final sampling voltage signal VSEN, the input signals of the non-overlapping signal generating circuit are the final sampling voltage signal VSEN and the ramp voltage signal VRAMP, and the non-overlapping signal generating circuit outputs a driving signal to the driving circuit; the driving circuit comprises a first alternating current signal output port AC1, a second alternating current signal output port AC2, a first driving buffer1, a second driving buffer2, a third driving buffer3, a fourth driving buffer4, a first transistor M1, a second transistor M2, a third transistor M3 and a fourth transistor M4, the first alternating current signal output port AC1 is respectively connected with the drain electrode of the first transistor M1 and the drain electrode of the third transistor M3; the second alternating current signal output port AC2 is respectively connected with the drain electrode of the second transistor M2 and the drain electrode of the fourth transistor M4; the non-overlapping signal generating circuit outputs a first driving signal QP1, a second driving signal QP2, a third driving signal QN1 and a fourth driving signal QN2 to respectively drive a first driving buffer1, a second driving buffer2, a third driving buffer3 and a fourth driving buffer4; the output of the first driving buffer1 is connected with the grid electrode of the first transistor M1, the output of the second driving buffer2 is connected with the grid electrode of the second transistor M2, the output of the third driving buffer3 is connected with the grid electrode of the third transistor M3, and the output of the fourth driving buffer4 is connected with the grid electrode of the fourth transistor M4; the source of the first transistor M1 and the source of the second transistor M2 are both connected to the power supply input port VDD; the source of the third transistor M3 and the source of the fourth transistor M4 are both connected to the ground input port GND; the sampling circuit comprises a sampling resistor R, a first amplifier AMP1, a fifth transistor M5 and a sixth transistor M6; an inverting input terminal of the first amplifier AMP1 is connected to the first alternating current signal output port AC1 of the driving circuit, and a non-inverting input terminal of the first amplifier AMP1 is connected to the drain of the sixth transistor M6; a gate of the fifth transistor M5 is connected to the output port of the first amplifier AMP 1; the gate of the sixth transistor M6 is connected to the gate of the third transistor M3 of the driving circuit; two ends of the sampling resistor R are respectively connected with the drain electrode of the fifth transistor M5 and the drain electrode of the sixth transistor M6; a source electrode of the fifth transistor M5 is connected to the power input port VDD; the source of the sixth transistor M6 is connected to the ground input port GND.
2. The transmitting circuit for a wireless energy transfer system of claim 1, wherein the amplifier and envelope detection circuit comprises a second amplifier, an envelope detection circuit; the non-inverting input terminal of the second amplifier AMP2 is connected to the drain of the fifth transistor M5; an inverting input terminal of the second amplifier AMP2 is connected to the drain of the sixth transistor M6; the output of the second amplifier AMP2 is connected to the input of the envelope detection circuit; the output port of the envelope detection circuit is the final sampled voltage signal port VSEN.
3. The transmitting circuit for a wireless energy transmission system according to claim 1, wherein the duty ratio of the first driving signal QP1 signal and the third driving signal QN1 signal is lower than 50%, the duty ratio of the second driving signal QP2 signal and the fourth driving signal QN2 signal is higher than 50%, and the duty ratio of the second driving signal QP2 signal and the fourth driving signal QN2 signal is reduced during the increase of the duty ratio of the first driving signal QP1 signal and the third driving signal QN1 signal so that the duty ratio of the entire driving signal approaches 50%.
4. A control method applied to the wireless energy transfer system of claim 1, the method comprising: sampling a current signal of a driving circuit of the transmitting coil in a half period to obtain effective sampling current in the half period; the sampling current flows through the sampling resistor, a preliminary sampling voltage signal is generated at two ends of the sampling resistor, and the preliminary sampling voltage signal is amplified to obtain a voltage waveform with a certain envelope; the voltage waveform with a certain envelope is input into an envelope detection circuit to obtain a final sampling voltage signal; comparing the final sampling voltage signal with a ramp voltage signal of a ramp signal generating circuit to obtain a preliminary duty ratio signal; the preliminary duty ratio signal is processed by non-overlapping logic of the non-overlapping signal circuit to generate a driving signal to drive the transmitting coil, so as to adjust driving power.
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