CN110970951A - Wireless charging circuit, system and method and electronic equipment - Google Patents
Wireless charging circuit, system and method and electronic equipment Download PDFInfo
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- CN110970951A CN110970951A CN201811152118.0A CN201811152118A CN110970951A CN 110970951 A CN110970951 A CN 110970951A CN 201811152118 A CN201811152118 A CN 201811152118A CN 110970951 A CN110970951 A CN 110970951A
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Abstract
The invention discloses a wireless charging circuit, a wireless charging system, a wireless charging method and electronic equipment, which are used for solving the problems that the circuit loss is too high and the temperature rises too fast due to thermal power and the quick charging of a battery cannot be realized in the conventional wireless charging circuit under the condition of large-current charging. Including N electric energy receiving module, N rectifier module, step-down module, charge pump module, wherein: the N electric energy receiving modules are used for receiving alternating current signals transmitted by the wireless power adapter, and each electric energy receiving module in the N electric energy receiving modules sends the received alternating current signal to one rectifying module in the N rectifying modules correspondingly connected with the electric energy receiving module; the N rectifying modules are used for converting the alternating current signals received by the N rectifying modules into direct current signals and then sending the direct current signals to the voltage reduction module; the voltage reduction module is used for reducing the voltage of the direct current signal to a target voltage value and then sending the target voltage value to the charge pump module; the charge pump module is used for outputting the direct current signal with the target voltage value to the battery to be charged after the direct current signal with the target voltage value is reduced.
Description
Technical Field
The present invention relates to the field of charging technologies, and in particular, to a wireless charging circuit, a wireless charging system, a wireless charging method, and an electronic device.
Background
With the powerful functions of electronic devices, the charging technology of electronic devices has been continuously developed and advanced, and in order to improve the convenience of charging, the wireless charging technology has slowly become a new trend, and the wireless charging technology is derived from the wireless power transmission technology.
The current architecture of a wireless charging circuit is shown in fig. 1, a wireless charging system is composed of a wireless power adapter and a charging device, the end of the wireless charging adapter is composed of a transmitting end power conversion module and an electric energy transmitting coil, the end of the charging device at least comprises an electric energy receiving coil, a Rectifier (Rectifier), a Buck converter (Buck converter) or an LDO (low dropout regulator), a Buck Charger (Buck charging circuit) and a battery to be charged, after the charging device obtains an alternating current signal through coil coupling, the alternating current signal needs to be converted into a direct current signal through the Rectifier, then the direct current signal is output through the Buck converter or the LDO for voltage stabilization, and finally the battery is charged through the Buck Charger. As can be seen from the structure shown in fig. 1, the structure of the single power transmitting coil and the power receiving coil limits the wireless charging to the inductive reactance and impedance of the single coil, and when a large current is charged, for example, the current exceeds 1A, the thermal power may cause too high circuit loss and too fast temperature rise, which may easily damage devices of the charging device, and may not achieve the fast charging of the battery.
That is to say, the existing wireless charging circuit has the problems that the circuit loss is too high due to the thermal power, the temperature rises too fast, and the quick charging of the battery cannot be realized under the condition of large-current charging.
Disclosure of Invention
The embodiment of the invention provides a wireless charging circuit, a wireless charging system, a wireless charging method and electronic equipment, which are used for solving the problems that the circuit loss is too high and the temperature rises too fast due to thermal power and the quick charging of a battery cannot be realized in the conventional wireless charging circuit under the condition of large-current charging.
The embodiment of the invention provides a wireless charging circuit, which comprises N electric energy receiving modules, N rectifying modules, a voltage reduction module and a charge pump module, wherein N is an integer greater than or equal to 2, and the wireless charging circuit comprises:
the N electric energy receiving modules are used for receiving alternating current signals transmitted by the wireless power adapter, and each electric energy receiving module in the N electric energy receiving modules sends the alternating current signal received by the electric energy receiving module to one rectifying module in the N rectifying modules correspondingly connected with the electric energy receiving module;
the N rectifying modules are used for converting the alternating current signals received by the N rectifying modules into direct current signals and sending the direct current signals to the voltage reduction module;
the voltage reduction module is used for reducing the voltage of the direct current signal to a target voltage value and then sending the target voltage value to the charge pump module;
and the charge pump module is used for outputting the direct current signal with the target voltage value to the battery to be charged after the direct current signal with the target voltage value is reduced.
Preferably, the wireless power adapter at least comprises a power transmitting module, the power transmitting module comprises a power transmitting coil, and the power receiving module comprises a power receiving coil; the wireless power adapter is provided with a power supply conversion module and is used for converting a received alternating current signal input by mains supply into an alternating current signal meeting the charging voltage and the charging current required by the battery to be charged and then sending the alternating current signal to the electric energy transmitting module; and
the N electric energy receiving modules are specifically configured to couple the alternating current signal transmitted by the electric energy transmitting coil through the electric energy receiving coil of each electric energy receiving module, and respectively send the alternating current signal to one of the N rectifying modules connected to the electric energy receiving module.
Preferably, the voltage reduction module is composed of N Buck circuit sub-modules connected in parallel, input ends of the N Buck circuit sub-modules are respectively connected with output ends of the N rectification modules correspondingly, and output ends of the N Buck circuit sub-modules are connected with an input end of the charge pump module.
Preferably, the Buck circuit submodule comprises a control module;
for any Buck circuit sub-module in the voltage reduction module, the Buck circuit sub-module is used for turning on a first group of switches in the Buck circuit sub-module and turning off a second group of switches in the Buck circuit sub-module when receiving a first control signal sent by the control module, so that a rectifying module connected with the Buck circuit sub-module can charge a capacitor in the Buck circuit sub-module and the charge pump module; and when a second control signal sent by the control module is received, closing a first group of switches in the Buck circuit sub-module, and opening a second group of switches in the Buck circuit sub-module, so that the capacitor in the Buck circuit sub-module can discharge to the inductor in the Buck circuit sub-module and charge to the charge pump module.
Preferably, the first set of switches comprises a first switch and a second switch, the second set of switches comprises a third switch and a fourth switch, and the capacitor comprises a first capacitor and a second capacitor, wherein:
the control end of the first switch is connected with the output end of the control module, the input end of the first switch is connected with the output end of the corresponding rectifying module, and the output end of the first switch is connected with the first end of the first capacitor and the input end of the third switch;
the control end of the second switch is connected with the output end of the control module, the input end of the second switch is connected with the output end of the third switch and the first end of the inductor, and the output end of the second switch is connected with the second end of the first capacitor and the input end of the fourth switch;
the control end of the third switch is connected with the output end of the control module;
the control end of the fourth switch is connected with the output end of the control module, and the output end of the fourth switch is grounded;
the second end of the inductor is connected with the first end of the second capacitor.
The embodiment of the invention provides electronic equipment which comprises an electronic equipment body, a battery to be charged and a wireless charging circuit.
The embodiment of the invention provides a wireless power adapter, which is suitable for a wireless charging system comprising the wireless power adapter and electronic equipment in the embodiment of the invention, wherein the wireless power adapter comprises a power conversion module and an electric energy emission module, wherein:
the power supply conversion module is used for receiving an alternating current signal input by mains supply, converting the alternating current signal input by the mains supply into an alternating current signal capable of meeting the charging requirement of the battery to be charged and then sending the alternating current signal to the electric energy emission module;
the electric energy transmitting module is used for receiving the alternating current signals sent by the power supply conversion module and then sending the alternating current signals to N electric energy receiving modules in the wireless charging circuit of the electronic equipment, so that each of the N power receiving modules transmits the ac signal received by it to one of the N rectifying modules connected to it in the wireless charging circuit, the N rectifying modules convert the alternating current signals received by the N rectifying modules into direct current signals, and sends the direct current signal to a voltage reduction module in the wireless charging circuit, so that the voltage reduction module reduces the voltage of the received direct current signal to a target voltage value and then sends the voltage to a charge pump module in the wireless charging circuit, enabling the charge pump module to output the direct current signal with the target voltage value to the battery to be charged after the direct current signal is subjected to voltage reduction; wherein N is an integer greater than or equal to 2.
Optionally, the wireless power adapter further includes:
and the wireless charging control module is used for receiving charging control information sent by the electronic equipment in a wireless communication mode, and sending the charging control information to the power supply conversion module, so that the power supply conversion module converts the received alternating current signal input by the mains supply into an alternating current signal capable of meeting the charging voltage and the charging current required by the battery to be charged according to the charging control information.
The embodiment of the invention provides a wireless charging system which comprises the electronic equipment and the wireless power adapter, wherein the wireless power adapter is used for charging the electronic equipment.
The embodiment of the invention provides a wireless charging method implemented by a wireless power adapter side, which is suitable for a wireless charging system comprising the wireless power adapter and electronic equipment in the embodiment of the invention, and the wireless charging method comprises the following steps:
a power supply conversion module in the wireless power supply adapter receives an alternating current signal input by commercial power;
a wireless charging control module in the wireless power adapter receives charging control information sent by the electronic equipment in a wireless communication mode and sends the charging control information to the power conversion module;
the power supply conversion module converts the alternating current signal input by the commercial power into an alternating current signal which can meet the charging voltage and the charging current required by the battery to be charged according to the charging control information and then sends the alternating current signal to the electric energy emission module;
the alternating current signal sent by the power conversion module is sent to N electric energy receiving modules in a wireless charging circuit of the electronic equipment through the electric energy transmitting module, so that each of the N power receiving modules transmits the ac signal received by it to one of the N rectifying modules connected to it in the wireless charging circuit, the N rectifying modules convert the alternating current signals received by the N rectifying modules into direct current signals, and sends the direct current signal to a voltage reduction module in the wireless charging circuit, so that the voltage reduction module reduces the voltage of the received direct current signal to a target voltage value and then sends the voltage to a charge pump module in the wireless charging circuit, enabling the charge pump module to output the direct current signal with the target voltage value to the battery to be charged after the direct current signal is subjected to voltage reduction; wherein N is an integer greater than or equal to 2.
The embodiment of the invention provides a wireless charging method implemented by an electronic device side, which is suitable for a wireless charging system comprising a wireless power adapter and the electronic device, and the wireless charging method comprises the following steps:
n electric energy receiving modules of the electronic equipment receive the alternating current signals transmitted by the wireless power adapter;
each electric energy receiving module in the N electric energy receiving modules sends the received alternating current signals to one rectifying module in the N rectifying modules correspondingly connected with the electric energy receiving module;
the N rectifying modules convert the received alternating current signals into direct current signals and send the direct current signals to the voltage reduction module;
the voltage reduction module reduces the voltage of the direct current signal to a target voltage value and then sends the target voltage value to the charge pump module;
and the charge pump module root outputs the direct current signal with the target voltage value to the battery to be charged after reducing the voltage.
Preferably, the voltage reduction module is composed of N Buck circuit sub-modules connected in parallel, input ends of the N Buck circuit sub-modules are respectively connected with output ends of the N rectification modules correspondingly, and output ends of the N Buck circuit sub-modules are connected with an input end of the charge pump module.
The invention has the following beneficial effects:
the embodiment of the invention provides a wireless charging circuit, a system, a method and electronic equipment, wherein the wireless charging circuit comprises N electric energy receiving modules, N rectifying modules, a voltage reduction module and a charge pump module, wherein N is an integer greater than or equal to 2, and the wireless charging circuit comprises: the N electric energy receiving modules are used for receiving alternating current signals transmitted by the wireless power adapter, and each electric energy receiving module in the N electric energy receiving modules sends the alternating current signal received by the electric energy receiving module to one rectifying module in the N rectifying modules correspondingly connected with the electric energy receiving module; the N rectifying modules are used for converting the alternating current signals received by the N rectifying modules into direct current signals and sending the direct current signals to the voltage reduction module; the voltage reduction module is used for reducing the voltage of the direct current signal to a target voltage value and then sending the target voltage value to the charge pump module; and the charge pump module is used for outputting the direct current signal with the target voltage value to the battery to be charged after the direct current signal with the target voltage value is reduced. Compared with the prior art, in the wireless charging circuit provided by the embodiment of the invention, a plurality of electric energy receiving modules are adopted to receive alternating current signals transmitted by the wireless power adapter, each electric energy receiving module is correspondingly connected with one rectifying module, each electric energy receiving module sends the received alternating current signals to the rectifying module connected with the electric energy receiving module, each rectifying module respectively converts the alternating current signals into direct current signals and sends the direct current signals to the voltage reducing module, the voltage reducing module reduces the voltage of the direct current signals to a target voltage and sends the target voltage to the charge pump module, the charge pump module outputs the target voltage to the battery to be charged to charge the battery to be charged, the thermal power on the charging circuit is reduced to 1/N of the thermal power of the existing wireless charging circuit, and the requirement on the impedance of an electric energy receiving coil of the electric energy receiving module can be effectively reduced, the power of the receiving end is improved, and the power consumption is effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a diagram illustrating a wireless charging circuit architecture in the prior art;
fig. 2 is a schematic structural diagram of a wireless charging circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wireless charging circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of a Buck circuit submodule provided in the embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a charge pump module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a wireless power adapter according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a wireless charging cable system according to an embodiment of the present invention;
fig. 9 is a schematic flowchart illustrating an implementation flow of a wireless charging method implemented by the wireless power adapter according to an embodiment of the present invention;
fig. 10 is a schematic implementation flow diagram of a wireless charging method implemented by an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problems that the circuit loss is too high due to thermal power, the temperature rises too fast and the quick charging of a battery cannot be realized in the conventional wireless charging circuit under the condition of large-current charging, the embodiment of the invention provides a wireless charging circuit. The wireless charging circuit may be generally disposed in a corresponding terminal device, such as a mobile phone, a tablet computer, a smart watch, a camera, and the like, and configured to transmit electric energy received from a wireless power adapter to a battery to be charged of the terminal device when the terminal device establishes a coupling connection with the corresponding wireless power adapter.
Fig. 2 is a schematic structural diagram of a wireless charging circuit according to an embodiment of the present invention. The wireless charging circuit may include N power receiving modules 11, N rectifying modules 12, a voltage reducing module 13, and a charge pump module 14, where N is an integer greater than or equal to 2, where:
the N power receiving modules 11 are configured to receive an ac power signal transmitted by the wireless power adapter, and each power receiving module 11 of the N power receiving modules 11 sends the ac power signal received by the power receiving module to one rectifying module 12 of the N rectifying modules 12 correspondingly connected to the power receiving module;
the N rectifying modules 12 are configured to convert the ac electrical signals received by the N rectifying modules into dc electrical signals, and send the dc electrical signals to the voltage reducing module 13;
the voltage reduction module 13 is configured to reduce the voltage of the dc signal to a target voltage value and send the target voltage value to the charge pump module 14;
the charge pump module 14 is configured to step down the dc signal with the target voltage value and output the dc signal to the battery to be charged.
In specific implementation, the wireless power adapter at least comprises an electric energy transmitting module, and the electric energy transmitting module comprises an electric energy transmitting coil. The wireless power adapter is provided with a power supply conversion module and is used for converting a received alternating current signal input by mains supply into an alternating current signal meeting the charging voltage and the charging current required by the battery to be charged and then transmitting the alternating current signal to the electric energy transmitting module. The electric energy receiving module 11 comprises an electric energy receiving coil, the electric energy receiving coil can be in any shape such as rectangle, circle or triangle, as long as the electric energy receiving coil can be matched with the electric energy transmitting coil in the wireless power adapter and interact with the electric energy transmitting coil by electric induction, magnetic resonance or electromagnetic wave. The coil diameters, the wire diameters and the materials of the electric energy receiving coil and the electric energy transmitting coil can be flexibly set according to actual conditions, and the electric energy receiving coil and the electric energy transmitting coil are not limited in the embodiment of the invention.
Specifically, each of the N power receiving modules 11 couples the alternating current signal transmitted by the power transmitting coil through its power receiving coil, and sends the alternating current signal to one of the N rectifying modules 12 connected to it, respectively.
Optionally, the rectifier module 12 may generally include a corresponding rectifier bridge circuit, such as a half-wave rectifier bridge circuit, a full-wave rectifier bridge circuit, or a bridge rectifier bridge circuit. The rectifier bridge circuit may be composed of corresponding diodes or thyristors. In a scenario with a high requirement on conversion efficiency, the devices in the rectification module 12 may also be transistors, such as a triode, a MOS transistor, and the like. The rectifier bridge circuit in the rectifier module 12 may be built by itself, and may also be integrated in a corresponding logic chip, which is not limited in the embodiment of the present invention.
Preferably, as shown in fig. 3, the voltage-reducing module 13 may be composed of N Buck circuit sub-modules 131 connected in parallel, input ends of the N Buck circuit sub-modules 131 are respectively connected to output ends of the N rectifier modules 12, and output ends of the N Buck circuit sub-modules 131 are connected to an input end of the charge pump module 14.
In specific implementation, as shown in fig. 4, it is a schematic diagram of a circuit structure of a Buck circuit submodule. As can be seen from fig. 4, the Buck circuit sub-module includes a control module; for any Buck circuit sub-module 131 in the voltage reduction module 13, the Buck circuit sub-module 131 is configured to, when receiving a first control signal issued by the control module, turn on a first group of switches in the Buck circuit sub-module 131 and turn off a second group of switches in the Buck circuit sub-module 131, so that the rectifier module 12 connected to the Buck circuit sub-module 131 can charge the capacitor in the Buck circuit sub-module 131 and the charge pump module 14; when a second control signal sent by the control module is received, the first group of switches in the Buck circuit sub-module 131 is turned off, and the second group of switches in the Buck circuit sub-module 131 is turned on, so that the capacitor in the Buck circuit sub-module 131 can discharge to the inductor in the Buck circuit sub-module 131 and charge to the charge pump module 14.
Specifically, the first set of switches includes a first switch Q1 and a second switch Q2, the second set of switches includes a third switch Q3 and a fourth switch Q4, the capacitors include a first capacitor C1 and a second capacitor C2, wherein: a control terminal of the first switch Q1 is connected to an output terminal of the control module, an input terminal of the first switch Q1 is connected to an output terminal of the corresponding rectifying module 12, and an output terminal of the first switch Q1 is connected to a first terminal of the first capacitor C1 and an input terminal of the third switch Q3; a control terminal of the second switch Q2 is connected to an output terminal of the control module, an input terminal of the second switch Q2 is connected to an output terminal of the third switch Q3 and a first terminal of the inductor L, and an output terminal of the second switch Q2 is connected to a second terminal of the first capacitor C1 and an input terminal of the fourth switch Q4; the control end of the third switch Q3 is connected with the output end of the control module; the control end of the fourth switch Q4 is connected with the output end of the control module, and the output end of the fourth switch Q4 is grounded; the second terminal of the inductor L is connected to the first terminal of the second capacitor C2.
Preferably, the switching element may be a transistor.
Alternatively, the transistor may comprise a triode or a field effect transistor.
It should be noted that, if the switch is a triode, the control terminal of the switch can be the base of the triode, the input terminal of the switch can be the collector (or emitter) of the triode, and the output terminal of the switch can be the emitter (or collector) of the triode; if the switch is a field effect transistor, the control end of the switch can be the grid electrode of the field effect transistor, the input end of the switch can be the drain electrode (or the source electrode) of the field effect transistor, and the output end of the switch can be the source electrode (or the drain electrode) of the field effect transistor. The input and output terminals of the switch may also be interchanged, which is not limited in this embodiment of the present invention.
Further optionally, the triode may include an NPN type triode and a PNP type triode, and the field effect transistor may include an N channel type field effect transistor, a P channel type field effect transistor, and the like, which is not limited in this embodiment of the present invention.
In addition, it should be noted that the first switch, the second switch, the third switch, and the fourth switch may also be any switching element capable of implementing a switching function, such as any single-pole double-throw switch, and the embodiment of the present invention is not limited thereto.
In FIG. 4, VINThe dc voltage output from the rectifier module 12 connected to the Buck circuit submodule 131 is switched by the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 as the input voltage of the Buck circuit submodule 131, so that V can be realizedSWAnd (4) switching of output level. Specifically, when the Buck circuit sub-module 131 receives a first control signal sent by the control module, the first switch Q1 and the second switch are turned onQ2 (i.e., the first switch Q1 and the second switch Q2 are turned on), and the third switch Q3 and the fourth switch Q4 are turned off (i.e., the third switch Q3 and the fourth switch Q4 are turned off), at this time, the rectifier module 12 connected to the Buck circuit sub-module 131 can charge the capacitors C1 and C2 in the Buck circuit sub-module 131 and the charge pump module 14, i.e., C1 and C2 are charged in series. When the Buck circuit submodule 131 receives a second control signal issued by the control module, the first switch Q1 and the second switch Q2 are turned off, and the third switch Q3 and the fourth switch Q4 are turned on, at this time, the capacitors C1 and C2 in the Buck circuit submodule 131 can discharge the inductor L in the Buck circuit submodule 131 and charge the charge pump module 14, and the capacitors C1 and C2 are output in parallel. In both cases, VSW＝VIN/2. Alternatively, V may also be achieved by switching of Q1, Q2, Q3 and Q4SWThe other two output levels. Specifically, when the Buck circuit submodule 131 receives a third control signal issued by the control module, the first switch Q1 and the third switch Q3 are turned off, and the second switch Q2 and the fourth switch Q4 are turned on, at this time, V isSW＝VIN. When the Buck circuit submodule 131 receives a fourth control signal issued by the control module, the first switch Q1 and the third switch Q3 are turned on, the second switch Q2 and the fourth switch Q4 are turned off, and at this time, V isSW0. Compared with the conventional Buck circuit, the Buck circuit provided by the embodiment of the invention is a high-voltage difference converter, can realize high-efficiency conversion of high input voltage by controlling the states of three levels, and has the advantages of high conversion efficiency and the characteristic of adjustable output voltage.
It should be noted that, the control module may not only implement issuing of the first control signal, the second control signal, the third control signal, and the fourth control signal in a software manner (for example, corresponding software programs may be written, and implement issuing of each control signal through execution of the software program), but also implement issuing of the first control signal, the second control signal, the third control signal, and the fourth control signal directly in a hardware manner (for example, implementing issuing of each control signal through a specific hardware chip), and the control module may issue each control signal according to a certain period (which may be flexibly set according to an actual situation), which is not limited in this embodiment of the present invention.
As shown in fig. 5, which is a schematic circuit structure diagram of the charge pump module 14, the charge pump module 14 may include four switches and three capacitors, so as to be distinguished from the switches in the Buck circuit sub-module 131, the four switches in the charge pump module 14 are respectively denoted as Q5, Q6, Q7, and Q8, it should be noted that the switches Q5 to Q8 may be the same as the switches Q1 to Q4, and details thereof are not repeated here. Similarly, the capacitances in the charge pump module 14 are denoted as C3, C4, and C5, respectively, as distinguished from the capacitances in the Buck circuit sub-module 131. Wherein:
a first terminal of a capacitor C3 may be connected to an output terminal of the Buck circuit submodule 131; the second end of the capacitor C2 is connected with the second end of the fourth switch Q4;
the input terminal of the switch Q5 may be connected to the output terminal of the Buck circuit submodule 131; the output end of the capacitor is connected with the input end of the switch Q7 and the first end of the capacitor C3;
the input end of the switch Q6 is connected with the second end of the capacitor C3 and the input end of the switch Q4, and the output end is connected with the first end of the capacitor C4 and the output end of the switch Q7;
the output end of the switch Q8 is connected with the second end of the capacitor C4 and serves as a common negative end;
an input terminal of the switch Q5 is used as an input terminal of the charge pump module 14, and an output terminal of the switch Q6, an output terminal of the switch Q7, or a first terminal of the capacitor C4 is used as an output terminal of the charge pump module 14.
It should be noted that the control terminal of each switching device in the charge pump module 14 may be connected to a corresponding controller or driver, and is used for being turned on or off under the control of the controller or driver. For example, when receiving a first driving signal sent by the controller or the driver, the switches Q5 and Q6 in the charge pump module 14 are turned on, and the switches Q7 and Q8 in the charge pump module 14 are turned off; and when receiving a second driving signal sent by the controller or the driver, turning on the switches Q7 and Q8 in the charge pump module 14, and turning off the switches Q5 and Q6 in the charge pump module 14.
Specifically, when the first driving signal is received, since the switches Q5 and Q6 in the charge pump module 14 are turned on, the electric energy sent by the Buck circuit submodule 131 can be enabled to charge the capacitors C3 and C4 in the charge pump module 14 and the battery to be charged; when the second driving signal is received, since the switches Q7 and Q8 in the charge pump module 14 are turned on, the capacitors C3 and C4 in the charge pump module 14 can be enabled to charge the battery to be charged.
The controller or the driver may be not only a software program, but also a corresponding hardware device, as long as it can send a corresponding driving signal to the charge pump module 14 according to the actual situation, for example, the first driving signal is sent in the first half period of a signal period, the second driving signal is sent in the second half period of a signal period, and the like; the first driving signal and the second driving signal can be flexibly set according to actual conditions, such as program codes, digital signals or level signals, as long as the actual requirements can be met, and further description is omitted.
It should be noted that the circuit structure formed by the switches Q5, Q6, Q7, Q8, capacitors C3, C4, and C4 may be generally referred to as a Charge Pump Converter (Charge Pump Converter) circuit.
Further, the switches Q5, Q6, Q7, and Q8 may include one or more switch elements connected in parallel, so as to effectively reduce on-resistances of the switches Q5, Q6, Q7, and Q8, increase a current in the wireless charging circuit, accelerate a charging speed of the wireless charging circuit, reduce a charging time of the wireless charging circuit, and improve a charging efficiency of the wireless charging circuit.
Optionally, the capacitors C3, C4 and C5 may each include at least one or more parallel capacitive elements. Because the ESR (Equivalent Series Resistance) of the whole electric capacity of a plurality of parallelly connected electric capacity component can effectual reduction, therefore, can increase effectively electric current among the wireless charging circuit accelerates wireless charging circuit's charging speed, reduction wireless charging circuit's charge time, improvement wireless charging circuit's charge efficiency.
The capacitor C5 may be used to compensate current for the capacitors (i.e., the capacitors C3 and C4) in the charge pump module 14 and the battery to be charged when the switches Q5 and Q6 in the charge pump module 14 are turned on and the switches Q7 and Q8 are turned off. That is to say, the input end of the charge pump module 14 is connected in parallel with a capacitor C5, and since the capacitor C3 is also connected in parallel with the two ends of the output end of the Buck circuit submodule 131, the Buck circuit submodule 131 can always charge the capacitor C5, so that when the switches Q5 and Q6 are turned on, the capacitor C5 can charge the capacitor C3, the capacitor C4 and the battery to be charged, thereby realizing the function of current compensation, and avoiding the problems of slow charging speed and long charging time caused by too small current output by the Buck circuit submodule 131.
The wireless charging circuit provided by the embodiment of the invention comprises N electric energy receiving modules, N rectifying modules, a voltage reduction module and a charge pump module, wherein N is an integer greater than or equal to 2, and the wireless charging circuit comprises: the N electric energy receiving modules are used for receiving alternating current signals transmitted by the wireless power adapter, and each electric energy receiving module in the N electric energy receiving modules sends the alternating current signal received by the electric energy receiving module to one rectifying module in the N rectifying modules correspondingly connected with the electric energy receiving module; the N rectifying modules are used for converting the alternating current signals received by the N rectifying modules into direct current signals and sending the direct current signals to the voltage reduction module; the voltage reduction module is used for reducing the voltage of the direct current signal to a target voltage value and then sending the target voltage value to the charge pump module; and the charge pump module is used for outputting the direct current signal with the target voltage value to the battery to be charged after the direct current signal with the target voltage value is reduced. Compared with the prior art, in the wireless charging circuit provided by the embodiment of the invention, a plurality of electric energy receiving modules are adopted to receive alternating current signals transmitted by the wireless power adapter, each electric energy receiving module is correspondingly connected with one rectifying module, each electric energy receiving module sends the received alternating current signals to the rectifying module connected with the electric energy receiving module, each rectifying module respectively converts the alternating current signals into direct current signals and sends the direct current signals to the voltage reducing module, the voltage reducing module reduces the voltage of the direct current signals to a target voltage and sends the target voltage to the charge pump module, the charge pump module outputs the target voltage to the battery to be charged to charge the battery to be charged, the thermal power on the charging circuit is reduced to 1/N of the thermal power of the existing wireless charging circuit, and the requirement on the impedance of an electric energy receiving coil of the electric energy receiving module can be effectively reduced, the power of the receiving end is improved, and the power consumption is effectively reduced.
Correspondingly, an embodiment of the present invention further provides an electronic device, as shown in fig. 6, which is a schematic structural diagram of the electronic device provided in the embodiment of the present invention. Specifically, as can be seen from fig. 6, the electronic device includes an electronic device body 21, a battery 22 to be charged installed in the electronic device, and a wireless charging circuit 23 according to an embodiment of the present invention.
It should be noted that the wireless charging circuit in the embodiment of the present invention is not only applicable to a scenario in which the terminal device is charged by using the wireless power adapter, but also applicable to a scenario in which the terminal device is charged by using a mobile power supply, and at this time, only the wireless power adapter may be replaced by the mobile power supply, which is not limited in this respect in the embodiment of the present invention.
An embodiment of the present invention further provides a wireless power adapter, which is suitable for a wireless charging system including a wireless power adapter and the electronic device provided in the embodiment of the present invention, as shown in fig. 7, and is a schematic structural diagram of the wireless power adapter provided in the embodiment of the present invention, where the wireless power adapter may include a power conversion module 31 and an electric energy emission module 32, where:
the power conversion module 31 is configured to receive an ac signal input by a mains supply, convert the ac signal input by the mains supply into an ac signal capable of meeting a charging requirement of the battery to be charged, and send the ac signal to the electric energy transmission module 32;
the electric energy transmitting module 32 is configured to receive the ac electric signals sent by the power conversion module 31 and send the ac electric signals to the N electric energy receiving modules 11 in the wireless charging circuit of the electronic device, so that each power receiving module 11 of the N power receiving modules 11 sends the ac electrical signal received by it to one rectifying module 12 of the N rectifying modules 12 connected to it in the wireless charging circuit, the N rectifier modules 12 convert the alternating current signals they receive into direct current signals, and sends the direct current signal to a voltage reduction module 13 in the wireless charging circuit, so that the voltage reduction module 13 reduces the voltage of the received direct current signal to a target voltage value and sends the target voltage value to a charge pump module 14 in the wireless charging circuit, enabling the charge pump module 14 to step down the direct current signal with the target voltage value and then output the direct current signal to the battery to be charged for charging; wherein N is an integer greater than or equal to 2.
Preferably, the wireless power adapter may further include:
and the wireless charging control module 33 is configured to receive charging control information sent by the electronic device in a wireless communication manner, and send the charging control information to the power conversion module 31, so that the power conversion module 31 converts the received alternating current signal input by the mains supply into an alternating current signal capable of meeting the charging voltage and the charging current required by the battery to be charged according to the charging control information.
In specific implementation, the wireless power adapter at least comprises a power transmitting module 32, and the power transmitting module comprises a power transmitting coil.
Preferably, the number of the electric energy transmitting modules 32 may be the same as the number N of the electric energy receiving modules 11 of the wireless charging circuit, at this time, the N electric energy transmitting coils of the N electric energy transmitting modules 32 are correspondingly connected with the N electric energy receiving coils of the N electric energy receiving modules of the wireless charging circuit one by one, so that each electric energy receiving module 11 is respectively coupled with the alternating current signals transmitted by the electric energy transmitting coils of the electric energy transmitting modules 32 correspondingly connected thereto through the electric energy receiving coils thereof.
An embodiment of the present invention further provides a wireless charging system, as shown in fig. 8, which is a schematic structural diagram of the wireless charging system according to the embodiment of the present invention. Specifically, as can be seen from fig. 8, the wireless charging system may include the wireless power adapter 41 described in the embodiment of the present invention and the electronic device 42 described in the embodiment of the present invention, and the wireless power adapter 41 may be used to charge the electronic device 42.
Based on the same inventive concept, embodiments of the present invention provide a wireless charging method implemented by a wireless power adapter, which is applicable to the wireless charging system comprising the wireless power adapter and an electronic device described in the foregoing embodiments, and the same contents may refer to related contents in the wireless power adapter, which is not described in detail in the embodiments of the present invention. Fig. 9 is a schematic flowchart illustrating an implementation flow of a wireless charging method implemented by the wireless power adapter according to an embodiment of the present invention.
Specifically, as can be seen from fig. 9, the wireless charging method may include the following steps:
s51, the power conversion module in the wireless power adapter receives the alternating current signal input by the commercial power.
And S52, the wireless charging control module in the wireless power adapter receives the charging control information sent by the electronic equipment in a wireless communication mode, and sends the charging control information to the power conversion module.
And S53, the power supply conversion module converts the alternating current signal input by the mains supply into an alternating current signal which can meet the charging voltage and the charging current required by the battery to be charged according to the charging control information and then sends the alternating current signal to the electric energy emission module.
And S54, sending the alternating current signal sent by the power conversion module to N electric energy receiving modules in a wireless charging circuit of the electronic equipment through the electric energy sending module.
Specifically, each of the N electric energy receiving modules sends the received alternating current signal to one of N rectifying modules in the wireless charging circuit, where the N rectifying modules are correspondingly connected to the corresponding one of the N rectifying modules, and the N rectifying modules convert the received alternating current signal into a direct current signal and send the direct current signal to a voltage reducing module in the wireless charging circuit, so that the voltage reducing module reduces the voltage of the received direct current signal to a target voltage value and then sends the voltage reduced voltage to a charge pump module in the wireless charging circuit, and the charge pump module reduces the voltage of the direct current signal with the target voltage value and then outputs the direct current signal to the battery to be charged; wherein N is an integer greater than or equal to 2.
Based on the same inventive concept, embodiments of the present invention provide a wireless charging method implemented by an electronic device, which is applicable to the wireless charging system including the wireless power adapter and the electronic device described in the foregoing embodiments, and the same contents can be referred to the related contents in the wireless charging circuit, which is not described in detail in the embodiments of the present invention. Fig. 10 is a schematic diagram illustrating an implementation flow of the wireless charging method implemented by the electronic device side in the embodiment of the present invention.
Specifically, as can be seen from fig. 10, the wireless charging method may include the following steps:
s61, the N power receiving modules of the electronic device receive the alternating current signals transmitted by the wireless power adapter.
And S62, each power receiving module in the N power receiving modules sends the received alternating current signal to one rectifying module in the N rectifying modules correspondingly connected with the power receiving module.
And S63, the N rectifying modules convert the received alternating current signals into direct current signals and send the direct current signals to the voltage reduction module.
And S64, the voltage reduction module reduces the voltage of the direct current signal to a target voltage value and then sends the target voltage value to the charge pump module.
And S65, the charge pump module step-down the direct current signal with the target voltage value and then outputs the direct current signal to the battery to be charged.
Preferably, the voltage reduction module is composed of N Buck circuit sub-modules connected in parallel, input ends of the N Buck circuit sub-modules are respectively connected with output ends of the N rectification modules correspondingly, and output ends of the N Buck circuit sub-modules are connected with an input end of the charge pump module.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. The utility model provides a wireless charging circuit, its characterized in that includes N electric energy receiving module, N rectifier module, step-down module, charge pump module, wherein, N is for being more than or equal to 2's integer, wherein:
the N electric energy receiving modules are used for receiving alternating current signals transmitted by the wireless power adapter, and each electric energy receiving module in the N electric energy receiving modules sends the alternating current signal received by the electric energy receiving module to one rectifying module in the N rectifying modules correspondingly connected with the electric energy receiving module;
the N rectifying modules are used for converting the alternating current signals received by the N rectifying modules into direct current signals and sending the direct current signals to the voltage reduction module;
the voltage reduction module is used for reducing the voltage of the direct current signal to a target voltage value and then sending the target voltage value to the charge pump module;
and the charge pump module is used for outputting the direct current signal with the target voltage value to the battery to be charged after the direct current signal with the target voltage value is reduced.
2. The wireless charging circuit of claim 1, wherein the wireless power adapter comprises at least one power transmitting module, the power transmitting module comprises a power transmitting coil, and the power receiving module comprises a power receiving coil; the wireless power adapter is provided with a power supply conversion module and is used for converting a received alternating current signal input by mains supply into an alternating current signal meeting the charging voltage and the charging current required by the battery to be charged and then sending the alternating current signal to the electric energy transmitting module; and
the N electric energy receiving modules are specifically configured to couple the alternating current signal transmitted by the electric energy transmitting coil through the electric energy receiving coil of each electric energy receiving module, and respectively send the alternating current signal to one of the N rectifying modules connected to the electric energy receiving module.
3. The wireless charging circuit of claim 1, wherein the voltage-reducing module is composed of N Buck circuit sub-modules connected in parallel, input ends of the N Buck circuit sub-modules are respectively connected to output ends of the N rectifying modules, and output ends of the N Buck circuit sub-modules are connected to an input end of the charge pump module.
4. The wireless charging circuit of claim 3, wherein the Buck circuit sub-module comprises a control module;
for any Buck circuit sub-module in the voltage reduction module, the Buck circuit sub-module is used for turning on a first group of switches in the Buck circuit sub-module and turning off a second group of switches in the Buck circuit sub-module when receiving a first control signal sent by the control module, so that a rectifying module connected with the Buck circuit sub-module can charge a capacitor in the Buck circuit sub-module and the charge pump module; and when a second control signal sent by the control module is received, closing a first group of switches in the Buck circuit sub-module, and opening a second group of switches in the Buck circuit sub-module, so that the capacitor in the Buck circuit sub-module can discharge to the inductor in the Buck circuit sub-module and charge to the charge pump module.
5. The wireless charging circuit of claim 4, wherein the first set of switches comprises a first switch and a second switch, wherein the second set of switches comprises a third switch and a fourth switch, and wherein the capacitance comprises a first capacitance and a second capacitance, wherein:
the control end of the first switch is connected with the output end of the control module, the input end of the first switch is connected with the output end of the corresponding rectifying module, and the output end of the first switch is connected with the first end of the first capacitor and the input end of the third switch;
the control end of the second switch is connected with the output end of the control module, the input end of the second switch is connected with the output end of the third switch and the first end of the inductor, and the output end of the second switch is connected with the second end of the first capacitor and the input end of the fourth switch;
the control end of the third switch is connected with the output end of the control module;
the control end of the fourth switch is connected with the output end of the control module, and the output end of the fourth switch is grounded;
the second end of the inductor is connected with the first end of the second capacitor.
6. An electronic device, comprising an electronic device body, a battery to be charged installed in the electronic device, and the wireless charging circuit according to any one of claims 1 to 5.
7. A wireless power adapter adapted to be used in a wireless charging system comprising the wireless power adapter and the electronic device of claim 6, wherein the wireless power adapter comprises a power conversion module and a power transmission module, and wherein:
the power supply conversion module is used for receiving an alternating current signal input by mains supply, converting the alternating current signal input by the mains supply into an alternating current signal capable of meeting the charging requirement of the battery to be charged and then sending the alternating current signal to the electric energy emission module;
the electric energy transmitting module is used for receiving the alternating current signals sent by the power supply conversion module and then sending the alternating current signals to N electric energy receiving modules in the wireless charging circuit of the electronic equipment, so that each of the N power receiving modules transmits the ac signal received by it to one of the N rectifying modules connected to it in the wireless charging circuit, the N rectifying modules convert the alternating current signals received by the N rectifying modules into direct current signals, and sends the direct current signal to a voltage reduction module in the wireless charging circuit, so that the voltage reduction module reduces the voltage of the received direct current signal to a target voltage value and then sends the voltage to a charge pump module in the wireless charging circuit, enabling the charge pump module to output the direct current signal with the target voltage value to the battery to be charged after the direct current signal is subjected to voltage reduction; wherein N is an integer greater than or equal to 2.
8. The wireless power adapter as recited in claim 7, further comprising:
and the wireless charging control module is used for receiving charging control information sent by the electronic equipment in a wireless communication mode, and sending the charging control information to the power supply conversion module, so that the power supply conversion module converts the received alternating current signal input by the mains supply into an alternating current signal capable of meeting the charging voltage and the charging current required by the battery to be charged according to the charging control information.
9. A wireless charging system comprising the electronic device of claim 6 and the wireless power adapter of claim 7 or 8, the wireless power adapter being configured to charge the electronic device.
10. A wireless charging method applied to the wireless charging system comprising the wireless power adapter and the electronic device as claimed in claim 9, the wireless charging method comprising:
a power supply conversion module in the wireless power supply adapter receives an alternating current signal input by commercial power;
a wireless charging control module in the wireless power adapter receives charging control information sent by the electronic equipment in a wireless communication mode and sends the charging control information to the power conversion module;
the power supply conversion module converts the alternating current signal input by the commercial power into an alternating current signal which can meet the charging voltage and the charging current required by the battery to be charged according to the charging control information and then sends the alternating current signal to the electric energy emission module;
the alternating current signal sent by the power conversion module is sent to N electric energy receiving modules in a wireless charging circuit of the electronic equipment through the electric energy transmitting module, so that each of the N power receiving modules transmits the ac signal received by it to one of the N rectifying modules connected to it in the wireless charging circuit, the N rectifying modules convert the alternating current signals received by the N rectifying modules into direct current signals, and sends the direct current signal to a voltage reduction module in the wireless charging circuit, so that the voltage reduction module reduces the voltage of the received direct current signal to a target voltage value and then sends the voltage to a charge pump module in the wireless charging circuit, enabling the charge pump module to output the direct current signal with the target voltage value to the battery to be charged after the direct current signal is subjected to voltage reduction; wherein N is an integer greater than or equal to 2.
11. A wireless charging method applied to the wireless charging system comprising the wireless power adapter and the electronic device as claimed in claim 9, the wireless charging method comprising:
n electric energy receiving modules of the electronic equipment receive the alternating current signals transmitted by the wireless power adapter;
each electric energy receiving module in the N electric energy receiving modules sends the received alternating current signals to one rectifying module in the N rectifying modules correspondingly connected with the electric energy receiving module;
the N rectifying modules convert the received alternating current signals into direct current signals and send the direct current signals to the voltage reduction module;
the voltage reduction module reduces the voltage of the direct current signal to a target voltage value and then sends the target voltage value to the charge pump module;
and the charge pump module root outputs the direct current signal with the target voltage value to the battery to be charged after reducing the voltage.
12. The method of claim 11, wherein the voltage-reducing module is composed of N Buck circuit sub-modules connected in parallel, input ends of the N Buck circuit sub-modules are respectively connected to output ends of the N rectifying modules, and output ends of the N Buck circuit sub-modules are connected to input ends of the charge pump module.
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| CN201811152118.0A CN110970951A (en) | 2018-09-29 | 2018-09-29 | Wireless charging circuit, system and method and electronic equipment |
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| CN201811152118.0A CN110970951A (en) | 2018-09-29 | 2018-09-29 | Wireless charging circuit, system and method and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104243A (en) * | 2020-11-05 | 2020-12-18 | 广东希荻微电子有限公司 | Step-down rectification circuit, wireless charging receiving chip and wireless charging receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104243A (en) * | 2020-11-05 | 2020-12-18 | 广东希荻微电子有限公司 | Step-down rectification circuit, wireless charging receiving chip and wireless charging receiver |
| US11557966B1 (en) | 2020-11-05 | 2023-01-17 | Halo Microelectronics Co., Ltd. | Step-down rectifier circuit, wireless charging receiver chip, and wireless charging receiver |
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