CN113141042A - One-to-many wireless time-sharing charging circuit and control method thereof - Google Patents
One-to-many wireless time-sharing charging circuit and control method thereof Download PDFInfo
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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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
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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
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Abstract
本发明公开了一种一对多无线分时充电电路及其控制方法，包括：发射端电路及多个接收端电路，接收端电路设置相应的预设充电条件，各个接收端电路中设置标识位检测电路，在当前分时充电周期与下一个分时充电周期，无线充电芯片对标识位分时检测电路进行充电或放电，以在下一个分时充电周期中，使标识位分时检测电路的电气状态不满足对应的预设充电条件。完成一个接收端电路同时或分时给多个接收端电路进行充电，本发明提供的充电电路及其控制方法，设计简单，造价低廉，易于实现。
The invention discloses a one-to-many wireless time-sharing charging circuit and a control method thereof, comprising: a transmitter circuit and a plurality of receiver circuits, the receiver circuits are set with corresponding preset charging conditions, and an identification bit is set in each receiver circuit The detection circuit, in the current time-sharing charging cycle and the next time-sharing charging cycle, the wireless charging chip charges or discharges the identification time-sharing detection circuit, so that in the next time-sharing charging cycle, the electrical The state does not meet the corresponding preset charging conditions. The charging circuit and the control method thereof provided by the present invention are simple in design, low in cost and easy to implement, so that one receiving end circuit can charge multiple receiving end circuits at the same time or in time-sharing.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a one-to-many wireless time-sharing charging circuit and a control method thereof.
Background
At present, the wireless charging technology of one transmitting end to one receiving end is mature and widely applied. With the large occurrence of small-sized wireless charging equipment such as a wireless charging earphone bin, a wireless charging watch and the like, the requirement that a single-coil sending end charges two receiving ends or a plurality of receiving ends simultaneously appears, the wireless charging service gradually appears in public places, and the requirement that one sending end independently charges a plurality of receiving ends in a time-sharing and wireless mode can not be met by considering the cost and the space.
Disclosure of Invention
Based on this, the technical problem to be solved by the present invention is to overcome the defect that one transmitting end cannot independently charge multiple receiving ends in a time-sharing wireless manner in the prior art, so as to provide a one-to-many wireless time-sharing charging circuit and a control method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a one-to-many wireless time-sharing charging circuit, including: a transmitting side circuit and a plurality of receiving side circuits, wherein,
the input end of the transmitting end circuit is connected with direct current, the output end of the transmitting end circuit is connected with the input end of each receiving end circuit in an electromagnetic coupling mode, and the transmitting end circuit is used for converting the direct current into alternating current, converting the alternating current into magnetic energy and sending the magnetic energy to each receiving end circuit;
the output end of the receiving end circuit is connected with a load and used for sensing the magnetic energy and converting the magnetic energy into a power supply voltage;
in the current time-sharing charging period, when the electrical state of the identification bit time-sharing detection circuit inside the receiving end circuit meets the corresponding preset charging condition, the power supply voltage is the load power supply, and in the power supply process, the identification bit time-sharing detection circuit is used for charging or discharging, so that in the next time-sharing charging period, the electrical state of the identification bit time-sharing detection circuit does not meet the corresponding preset charging condition.
Optionally, the one-to-many wireless time-sharing charging circuit further includes:
in the current time-sharing charging period, when the electrical state of the identification bit time-sharing detection circuit inside the receiving end circuit does not meet the corresponding preset charging condition, the identification bit time-sharing detection circuit is used for charging or discharging, so that in the next time-sharing charging period, the electrical state of the identification bit time-sharing detection circuit meets the corresponding preset charging condition.
Optionally, the receiving end circuit further includes: a coupling circuit, a rectifying circuit and a wireless charging chip, wherein,
the output end of the coupling circuit is connected with the input end of the rectifying circuit and used for inducing the magnetic energy to obtain alternating current;
the output end of the rectifying circuit is connected with the input end of the wireless charging chip and used for rectifying the alternating current into power supply voltage;
the output end of the wireless charging chip is respectively connected with the identification position time-sharing detection circuit and the load and used for charging or discharging the identification position time-sharing detection circuit through the wireless charging chip so as to enable the electrical state of the identification position time-sharing detection circuit to meet or not meet the corresponding preset charging condition in the next time-sharing charging period.
Optionally, the identification bit time-sharing detection circuit includes: a resistor, a diode and a memory circuit,
the first end of the memory circuit is respectively connected with the first end of the resistor, the cathode of the diode and the wireless charging chip, the second end of the memory circuit is connected with the grounding end, and the second end of the resistor and the anode of the diode are both connected with the wireless charging chip.
Optionally, the memory circuit comprises: capacitance or EEPROM or Flash.
In a second aspect, an embodiment of the present invention provides a one-to-many wireless time-sharing charging control method, where based on the one-to-many wireless time-sharing charging circuit in the first aspect of the embodiment, the control method includes:
each receiving end circuit induces the magnetic energy and converts the magnetic energy into power supply voltage;
in the current timesharing charge cycle, every receiving end circuit judges whether its inside identification bit timesharing detection circuitry's electrical state satisfies the corresponding predetermined condition of charging, when satisfying corresponding predetermined condition of charging, receiving end circuit will supply voltage does the load power supply, and in power supply process, identification bit timesharing detection circuitry is used for charging or discharging to at next timesharing charge cycle, make identification bit timesharing detection circuitry's electrical state does not satisfy the corresponding predetermined condition of charging.
Optionally, the one-to-many wireless time-sharing charging control method further includes:
in the current time-sharing charging period, when the electrical state of the identification bit time-sharing detection circuit inside the receiving end circuit does not meet the corresponding preset charging condition, the identification bit time-sharing detection circuit is used for charging or discharging, so that in the next time-sharing charging period, the electrical state of the identification bit time-sharing detection circuit meets the corresponding preset charging condition.
Optionally, before the step of sensing the magnetic energy and converting the magnetic energy into a power supply voltage, each of the receiving end circuits further includes:
the transmitting end circuit converts direct current into alternating current, converts the alternating current into magnetic energy, and sends the magnetic energy to each receiving end circuit.
Optionally, a preset time interval is provided between the current time-sharing charging cycle and the next time-sharing charging cycle.
Optionally, the plurality of receiving-end circuits do not have the same preset charging condition;
the preset charging condition is as follows: when the electrical state of the identification bit time-sharing detection circuit is higher than a preset high voltage threshold, the receiving end circuit supplies power to the load; or when the electrical state of the identification bit time-sharing detection circuit is lower than a preset high voltage threshold, the receiving end circuit supplies power to the load.
Optionally, the plurality of receiving-end circuits have the same preset charging condition;
the preset charging condition is as follows: when the electrical state of the identification bit time-sharing detection circuit is higher than a preset high voltage threshold, the receiving end circuit supplies power to the load; or when the electrical state of the identification bit time-sharing detection circuit is lower than a preset high voltage threshold, the receiving end circuit supplies power to the load.
Optionally, the electrical state is a voltage value of the capacitor.
Optionally, when the wireless charging chip pulls the second end of the resistor low, the capacitor discharges through the resistor; when the wireless charging chip floats or pulls up the second end of the resistor, the wireless charging chip charges the capacitor through the diode.
The technical scheme of the invention has the following advantages:
the invention provides a one-to-many wireless time-sharing charging circuit and a control method thereof.A receiving end circuit sets corresponding preset charging conditions, each receiving end circuit is provided with an identification bit detection circuit, and a wireless charging chip charges or discharges the identification bit time-sharing detection circuit in the current time-sharing charging period and the next time-sharing charging period so as to enable the electrical state of the identification bit time-sharing detection circuit to meet or not meet the corresponding preset charging conditions in the next time-sharing charging period. And charging a plurality of receiving end circuits simultaneously or in time sharing after one receiving end circuit is completed. The one-to-many wireless time-sharing charging circuit and the control method thereof provided by the invention have the advantages of simple design, low manufacturing cost and easiness in implementation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a specific example of a one-to-many wireless time-sharing charging circuit according to an embodiment of the present invention;
fig. 2 is a composition diagram of another specific example of a one-to-many wireless time-sharing charging circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a specific example of the identification bit time sharing detection circuit according to the embodiment of the present invention;
fig. 4 is a timing diagram of a specific example of a one-to-many wireless time-sharing charging circuit according to an embodiment of the present invention;
fig. 5 is a timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit according to the embodiment of the present invention;
fig. 6 is a timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit according to the embodiment of the present invention;
fig. 7 is a timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit according to the embodiment of the present invention;
fig. 8 is a timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit according to the embodiment of the present invention;
fig. 9 is a timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit according to the embodiment of the present invention;
fig. 10 is a flowchart illustrating a specific example of a receiving end circuit of a one-to-many wireless time-sharing charging control method according to an embodiment of the present invention;
fig. 11 is a flowchart of another specific example of a receiving end circuit of a one-to-many wireless time-sharing charging control method according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a one-to-many wireless time-sharing charging circuit which is applied to a scene that one sending end can carry out power transmission on a plurality of receiving ends simultaneously or in a time-sharing mode.
As shown in fig. 1, the one-to-many wireless time-sharing charging circuit includes: a transmitting side circuit 1 and a plurality of receiving side circuits 2. Wherein the input end of the transmitting end circuit 1 is used for being electrically connected with a direct current. An output terminal of the transmitting-end circuit 1 is connected to an input terminal of each receiving-end circuit 2 by electromagnetic coupling. The transmitting-end circuit 1 is configured to convert direct current into alternating current, convert the alternating current into magnetic energy, and send the magnetic energy to each receiving-end circuit 2. The output of the receiving-side circuit 2 is used for connection to a load. The receiving end circuit 2 is configured to sense magnetic energy of the receiving end circuit 2 and convert the magnetic energy into a supply voltage.
As shown in fig. 2, an identification bit time division detection circuit 24 is provided inside each receiving-end circuit 2. The identification bit time division detection circuit 24 in each receiving end circuit 2 is initialized to a low level. Each receiving-end circuit 2 converts the induced magnetic energy into a supply voltage. Meanwhile, each identification bit time-sharing detection circuit 24 has a corresponding preset charging condition. Each receiving end circuit 2 judges whether the electrical state of its internal identification bit time-sharing detection circuit 24 satisfies the corresponding preset charging condition. The preset charging conditions may be the same or different, and the purpose of charging the plurality of receiving-end circuits 2 simultaneously or in time-division by the transmitting-end circuit 1 is achieved by setting the preset charging conditions to be respectively corresponding to the same or different preset charging conditions.
In one embodiment, as shown in fig. 3, the identification bit time division detection circuit 24 includes: a resistor R1, a diode D1 and a memory circuit C1. The first end of the memory circuit C1 is connected to the first end of the resistor R1, the cathode of the diode D1 and the wireless charging chip 23. The second terminal of the memory circuit C1 is connected to ground. The second end of the resistor R1 and the anode of the diode D1 are both connected with the wireless charging chip 23. In the embodiment of the present invention, the memory circuit C1 includes: any one of the non-volatile memories such as a capacitor, an EEPROM, and a Flash may be other memory circuits having a memory function, which is only an example, but not limited thereto, and the corresponding memory circuit C1 is selected according to actual requirements in practical applications. The identification bit time-sharing detection circuit 24 provided by the embodiment of the invention has the advantages of simple design and lower cost.
In an embodiment, as shown in fig. 2, the receiving end circuit 2 further includes: coupling circuit 21, rectifier circuit 22 and wireless charging chip 23.
The output of the coupling circuit 21 is connected to the input of the rectifying circuit 22. For converting the induced magnetic energy into alternating current. The output end of the rectifying circuit 22 is connected with the input end of the wireless charging chip 23. For rectifying the alternating current into a supply voltage. The coupling circuit 21 and the rectifying circuit 22 are both well-established circuits in the prior art and are not limited herein.
The output end of the wireless charging chip 23 is connected with the identification bit time-sharing detection circuit 24 and the load respectively. The wireless charging chip 23 is used for charging or discharging the identification bit time-sharing detection circuit 24, so that in the next time-sharing charging period, the electrical state of the identification bit time-sharing detection circuit 24 meets or does not meet the corresponding preset charging condition. Specifically, when the wireless charging chip 23 pulls the second terminal of the resistor R1 low, the capacitor discharges through the resistor R1. When the wireless charging chip 23 floats or pulls up the second end of the resistor, the wireless charging chip charges the capacitor through the diode D1. The memory circuit C1 of the identification bit time-sharing detection circuit 24 provided by the embodiment of the present invention can select a non-volatile memory such as a capacitor, an EEPROM, a Flash, and the like, and has a low cost.
In the embodiment of the present invention, the electrical state is a capacitor voltage value, and the capacitor voltage value can be converted into a high/low level value. The preset charging conditions may be the same or different. The preset charging conditions are as follows: when the electrical state of the identification bit time-sharing detection circuit 24 is higher than the preset high voltage threshold, the receiving end circuit 2 supplies power to the load; or, when the electrical state of the identification bit time-sharing detection circuit 24 is lower than the preset high voltage threshold, the receiving end circuit 2 supplies power to the load, and the electrical state is the voltage value of the capacitor. For example only, and not limited thereto, in practical applications, the corresponding preset high voltage threshold is selected according to practical requirements. The same or different preset charging conditions are set to charge the plurality of receiving-end circuits 2 simultaneously or in a time-sharing manner in the transmitting-end circuit 1.
In an embodiment, in the current time-sharing charging cycle, when the electrical state of the identification bit time-sharing detection circuit 24 inside the receiving end circuit 2 satisfies the corresponding preset charging condition, the power supply voltage supplies power to the load. And during the power supply process, the identification bit time division detection circuit 24 is used for charging or discharging. So that the electrical state of the identification bit time-sharing detection circuit 24 does not satisfy the corresponding preset charging condition in the next time-sharing charging period.
The current time-sharing charging period is separated from the next time-sharing charging period by a preset time interval. Since the corresponding preset charging conditions in the receiving-end circuit 2 are the same or different, the receiving-end circuit 2 may operate simultaneously or not operate simultaneously. Therefore, the preset time interval between the current time-sharing charging period and the next time-sharing charging period is prolonged, and the time-sharing communication enters the logic of normal charging.
During the extension of the preset time interval, the transmitting-end circuit 1 does not transmit energy to the receiving-end circuit 2. For example: when the plurality of receiving-side circuits 2 do not operate simultaneously, the transmitting-side circuit 1 does not receive a communication signal for a long time. The transmitter circuit 1 will extend the predetermined time interval to restore the initial state of the memory circuit C1 to zero, so as to enable the time-sharing communication to enter the logic of normal charging. When the plurality of receiving-side circuits 2 operate simultaneously, the transmitting-side circuit 1 receives a plurality of communication signals or scrambling signals simultaneously. The transmitting end circuit 1 will extend the predetermined time interval to restore the initial state of the memory circuit C1 to zero, so that the logic of the transmitting end circuit 1 can re-enter the normal charging of time-sharing communication. By way of example only, and not by way of limitation, in practical applications, the corresponding preset time interval is selected according to practical requirements.
The embodiment of the present invention is to be explained as follows: each identification bit time-sharing detection circuit 24 has a corresponding preset charging condition. The preset charging conditions may be the same or different, and the purpose of charging the plurality of receiving-end circuits 2 simultaneously or in time-division by the transmitting-end circuit 1 is achieved by setting the preset charging conditions to be respectively corresponding to the same or different preset charging conditions.
As shown in fig. 4, when there are two receiving terminals PRx, and the charging conditions preset by PRx1 and PRx2 are the same (the capacitance changes from 0 to 1). The capacitances of the initial states PRx1 and PRx2 are zero, and the initial states are not limited herein and are set accordingly according to actual situations.
In the time period t0-t1, the electrical state of the identification bit time sharing detection circuit 24 meets the preset charging conditions of PRx1 and PRx2, and the transmitting terminal Tx charges PRx1 and PRx2 at the same time. The capacitances of PRx1 and PRx2 become 1, and then enter a quiescent period t1-t2, and the transmitting terminal Tx does not charge PRx1 and PRx 2.
In the charging process from t0 to t1, when the capacitances of PRx1 and PRx2 are detected to be 1, the capacitances of PRx1 and PRx2 in the wireless charging chip 23 detection part-time detection circuit 24 are detected to be 1. The second terminal of the resistor R1 is pulled low by the wireless charging chip 23, and the capacitor is discharged through the resistor R1. In the next time-sharing charging period t2-t3, the electrical state of the identification bit time-sharing detection circuit 24 does not satisfy the corresponding preset charging condition, and the transmitting terminal Tx does not charge the PRx1 and PRx 2. Therefore, the purpose of simultaneously performing time-sharing charging on two receiving terminals PRx by one transmitting terminal Tx is achieved, which is only taken as an example and not limited to this, and in practical applications, a corresponding number of transmitting-end circuits 2 are selected according to actual requirements.
As shown in fig. 5, when there are two receiving terminals PRx and the PRx1 and PRx2 preset charging conditions are different, the preset charging condition of PRx1 is: the capacitance changes from 0 to 1. Preset charging condition of PRx 2: the capacitance changes from 1 to 0. The capacitances of the initial states PRx1 and PRx2 are zero.
In the time period from t0 to t1, the electrical state of the identification bit time sharing detection circuit 24 meets the PRx1 preset charging condition, the transmitting terminal Tx charges the PRx1, and at this time, the PRx2 does not act. During charging, the PRx1 capacitance becomes 1 before entering the quiescent phase t1-t 2. The transmitting terminal Tx does not charge PRx1 and PRx2, and the capacitance of PRx1 is 1.
In the charging process of t0-t1, the wireless charging chip 23 of PRx1 detects the electrical state of the capacitor in the identification bit time sharing detection circuit 24. The wireless charging chip 23 of PRx1 pulls the second terminal of the resistor R1 low, and the capacitor discharges through the resistor R1. So that the electrical state of the PRx1 identification bit time sharing detection circuit 24 does not meet the corresponding preset charging condition in the next time sharing charging period t2-t 3. The transmitting terminal Tx does not charge the PRx 1. Therefore, the purpose of charging the receiving end PRx1 in a time division manner by the transmitting end Tx is achieved.
When a receiving terminal PRx3 is added and the preset charging condition of PRx3 is that the capacitance changes from 0 to 1, a transmitting terminal Tx simultaneously time-divisionally charges the receiving terminals PRx1 and PRx 3. By way of example only, and not by way of limitation, in practical applications, a corresponding number of the transmitting-end circuits 2 are selected according to practical requirements.
In a specific embodiment, the embodiment of the present invention further includes: in the current time-sharing charging period, when the electrical state of the identification bit time-sharing detection circuit 24 inside the receiving end circuit 2 does not satisfy the corresponding preset charging condition, the identification bit time-sharing detection circuit 24 is used for charging or discharging. So that the electrical state of the identification bit time-sharing detection circuit 24 meets the corresponding preset charging condition in the next time-sharing charging period.
As shown in fig. 6, when there are two receiving terminals PRx, and the charging conditions preset by PRx1 and PRx2 are the same (the capacitance changes from 1 to 0). The capacitances of the initial states PRx1 and PRx2 are zero.
In the time period t0-t1, the electrical state of the identification bit time division detection circuit 24 does not satisfy the PRx1 and PRx2 preset charging conditions. At the stage t0-t1, the wireless charging chips 23 detect the electrical state of the capacitor in the identification bit time-sharing detection circuit 24, the second ends of the resistors are floated or pulled up by the respective wireless charging chips 23, and the wireless charging chips charge the capacitor through the diode D1.
The capacitances of PRx1 and PRx2 become 1. Then enters a static phase t1-t2, the transmitting terminal Tx does not charge PRx1 and PRx 2. The capacitances of PRx1 and PRx2 are 1, so that the electrical state of the identification bit time division detection circuit 24 satisfies the PRx1 and PRx2 preset charging conditions during the time period t2-t 3. The Tx terminal Tx charges PRx1 and PRx2 at the same time in a time-sharing manner. Therefore, when the corresponding preset charging condition is not met, one transmitting terminal Tx simultaneously carries out time-sharing charging on two receiving terminals PRx1 and PRx 2. By way of example only, and not by way of limitation, in practical applications, a corresponding number of the transmitting-end circuits 2 are selected according to practical requirements.
As shown in fig. 7, when there are two receiving terminals PRx and the PRx1 and PRx2 preset charging conditions are different, the preset charging condition of PRx1 is: the capacitance changes from 0 to 1. Preset charging condition of PRx 2: the capacitance changes from 1 to 0. The capacitances of the initial states PRx1 and PRx2 are zero.
During the time period t0-t1, Tx charges the receiving terminal PRx 1. Meanwhile, the wireless charging chip 23 of the PRx2 detects the electrical state of the capacitor in the PRx2 identification bit time sharing detection circuit 24.
The second end of the resistor is floated or pulled high by the wireless charging chip 23 of the PRx2, and the wireless charging chip 23 charges the capacitor through the diode D1. The capacitance of PRx2 becomes 1 and then enters a quiescent period t1-t2, and the transmitting terminal Tx does not charge PRx1 and PRx 2. The capacitances of PRx1 and PRx2 are 1, so that the wireless charging chip 23 detects the electrical state of the capacitance in the identification bit time division detection circuit 24 during the time period t2-t 3. The respective wireless charging chips 23 pull the second terminal of the resistor R1 low. The capacitor discharges through the resistor R1, so that the electrical state of the identification bit time-sharing detection circuit 24 satisfies the corresponding preset charging condition, and at this time, Tx charges the receiving terminal PRx 2. Therefore, when the corresponding preset charging condition is not met, one transmitting terminal Tx simultaneously carries out time-sharing charging on two receiving terminals PRx1 and PRx 2. By way of example only, and not by way of limitation, in practical applications, a corresponding number of the transmitting-end circuits 2 are selected according to practical requirements.
In another embodiment, in the current time-sharing charging cycle, when the electrical state of the identification bit time-sharing detection circuit 24 inside the receiving end circuit 2 meets the corresponding preset charging condition, the power supply voltage supplies power to the load. In the power supply process, the identification bit time-sharing detection circuit 24 is used for charging or discharging, so that in the next time-sharing charging period, the electrical state of the identification bit time-sharing detection circuit 24 does not meet the corresponding preset charging condition. In the current time-sharing charging cycle, when the electrical state of the identification bit time-sharing detection circuit 24 inside the receiving end circuit 2 does not satisfy the corresponding preset charging condition, the identification bit time-sharing detection circuit 24 is used for charging or discharging, so that in the next time-sharing charging cycle, the electrical state of the identification bit time-sharing detection circuit 24 satisfies the corresponding preset charging condition.
As shown in fig. 8, when there are two receiving terminals PRx, and the charging conditions preset by PRx1 and PRx2 are the same (the capacitance changes from 0 to 1).
In the time period t0-t1, the electrical state of the identification bit time sharing detection circuit 24 meets the preset charging conditions of PRx1 and PRx2, and the transmitting terminal Tx charges PRx1 and PRx2 at the same time. The capacitances of PRx1 and PRx2 become 1 before entering the quiescent phase t1-t 2. The transmitting terminal Tx does not charge PRx1 and PRx2, and the capacitances of PRx1 and PRx2 are 1.
The wireless charging chip 23 detects the electrical state of the capacitor in the identification bit time-sharing detection circuit 24. The respective wireless charging chips 23 pull the second terminal of the resistor R1 low. The capacitor is discharged through the resistor R1, so that in the next time-sharing charging period t2-t3, the electrical state of the identification bit time-sharing detection circuit 24 does not satisfy the corresponding preset charging condition, and the transmitting terminal Tx does not charge the PRx1 and the PRx 2. And then entering a static stage from t3 to t4, and circulating the steps to fulfill the aim that one transmitting end circuit simultaneously carries out time-sharing charging on two receiving ends PRx1 and PRx 2. By way of example only, and not by way of limitation, in practical applications, a corresponding number of the transmitting-end circuits 2 are selected according to practical requirements.
As shown in fig. 9, when there are two receiving terminals PRx and the PRx1 and PRx2 preset charging conditions are different, the preset charging condition of PRx1 is: the capacitance changes from 0 to 1. Preset charging condition of PRx 2: the capacitance changes from 1 to 0. The capacitances of the initial states PRx1 and PRx2 are zero.
In the time period t0-t1, the electrical state of the identification bit time sharing detection circuit 24 meets the PRx1 preset charging condition, the transmitting terminal Tx charges the PRx1, and the PRx2 is not charged at the time.
The wireless charging chip 23 of the PRx1 detects the electrical state of the capacitor in the identification bit time sharing detection circuit 24. The wireless charging chip 23 pulls the second terminal of the resistor R1 of PRx1 low. The capacitor is discharged through the resistor R1, so that in the next time-sharing charging period t2-t3, the electrical state of the PRx1 identification bit time-sharing detection circuit 24 does not meet the corresponding preset charging condition, and the transmitting terminal Tx does not charge the PRx 1.
The wireless charging chip 23 of PRx2 floats or pulls the second end of the resistor high. The wireless charging chip 23 charges the capacitor through the diode D1, so that in the next time-sharing charging period t2-t3, the electrical state of the PRx2 identification bit time-sharing detection circuit 24 satisfies the corresponding preset charging condition. And then entering a static stage t3-t4, wherein the transmitting terminal Tx does not charge the PRx1 and the PRx2, and the steps are cycled to fulfill the aim of charging two receiving terminals PRx1 and PRx2 by one transmitting terminal circuit in a time sharing mode. By way of example only, and not by way of limitation, in practical applications, a corresponding number of the transmitting-end circuits 2 are selected according to practical requirements.
In the one-to-many wireless time-sharing charging circuit provided by the embodiment of the invention, the receiving end circuit 2 is set with different preset charging conditions. An identification bit detection circuit 24 is provided in each receiving-end circuit 2. In the current time-sharing charging cycle and the next time-sharing charging cycle, the wireless charging chip 23 charges or discharges the identification bit time-sharing detection circuit 24, so that the electrical state of the identification bit time-sharing detection circuit 24 meets or does not meet the corresponding preset charging condition in the next time-sharing charging cycle. One receiving-end circuit 1 is completed to charge a plurality of receiving-end circuits 2 simultaneously or in time division. Meanwhile, the memory circuit C1 provided by the embodiment of the present invention may use a capacitor, an EEPROM, or a Flash or other nonvolatile memory. The one-to-many wireless time-sharing charging circuit provided by the embodiment of the invention has the advantages of simple design, low manufacturing cost and easiness in implementation.
Example 2
An embodiment of the present invention provides a one-to-many wireless time-sharing charging control method, based on the one-to-many wireless time-sharing charging circuit in embodiment 1, as shown in fig. 10, the control method includes the following steps:
step S1: each receiving end circuit induces the magnetic energy and converts the magnetic energy into a power supply voltage.
Step S2: in the current timesharing charge cycle, every receiving end circuit judges whether its inside identification bit timesharing detection circuitry's electrical state satisfies the corresponding predetermined condition of charging, when satisfying corresponding predetermined condition of charging, receiving end circuit will supply voltage does the load power supply, and in power supply process, identification bit timesharing detection circuitry is used for charging or discharging to at next timesharing charge cycle, make identification bit timesharing detection circuitry's electrical state does not satisfy the corresponding predetermined condition of charging.
In the embodiment of the present invention, the electrical state is a capacitor voltage value, and the capacitor voltage value can be converted into a high/low level value. The preset charging conditions may be the same or different. The preset charging conditions are as follows: when the electrical state of the identification bit time-sharing detection circuit is higher than a preset high voltage threshold, the receiving end circuit supplies power to the load; or when the electrical state of the identification bit time-sharing detection circuit is lower than a preset high voltage threshold, the receiving end circuit supplies power to the load, and the electrical state is the voltage value of the capacitor. For example only, and not limited thereto, in practical applications, the corresponding preset high voltage threshold is selected according to practical requirements.
In the embodiment of the invention, a preset time interval is arranged between the current time-sharing charging period and the next time-sharing charging period. Since the corresponding preset charging conditions in the receiving end circuit are the same or different, a situation may occur in which the receiving end circuit operates simultaneously or does not operate simultaneously. Therefore, the logic that the current time-sharing charging period is separated from the next time-sharing charging period by a preset time interval to enable the time-sharing communication to be charged normally is prolonged.
During the process of prolonging the preset time interval, the transmitting end circuit does not transmit energy to the receiving end circuit. For example: when a plurality of receiving-side circuits do not operate simultaneously, the transmitting-side circuit does not receive a communication signal for a long time. The transmitting end circuit can prolong the preset time interval, so that the memory circuit is restored to the initial state of zero, and the time-sharing communication enters the logic of normal charging. When a plurality of receiving-side circuits operate simultaneously, a transmitting-side circuit receives a plurality of communication signals or scrambling code signals simultaneously. The transmitting end circuit can prolong the preset time interval to enable the memory circuit to be restored to the initial state of zero, so that the logic of the transmitting end circuit can reenter the time-sharing communication normal charging. By way of example only, and not by way of limitation, in practical applications, the corresponding preset time interval is selected according to practical requirements.
In a specific embodiment, the control method provided in the embodiment of the present invention further includes: in the current time-sharing charging period, when the electrical state of the identification bit time-sharing detection circuit inside the receiving end circuit does not meet the corresponding preset charging condition, the identification bit time-sharing detection circuit is used for charging or discharging, so that in the next time-sharing charging period, the electrical state of the identification bit time-sharing detection circuit meets the corresponding preset charging condition.
In one embodiment, as shown in fig. 11, before the step S1, the method further includes a step S0: the transmitting end circuit converts direct current into alternating current, converts the alternating current into magnetic energy, and sends the magnetic energy to each receiving end circuit.
In the one-to-many wireless time-sharing charging control method provided by the embodiment of the invention, the receiving end circuits are provided with different preset charging conditions, each receiving end circuit is provided with the identification bit detection circuit, and the wireless charging chip charges or discharges the identification bit time-sharing detection circuit in the current time-sharing charging period and the next time-sharing charging period so that the electrical state of the identification bit time-sharing detection circuit meets or does not meet the corresponding preset charging condition in the next time-sharing charging period. And charging a plurality of receiving end circuits simultaneously or in time sharing after one receiving end circuit is completed. The control method provided by the embodiment of the invention is simple to operate and easy to realize.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (13)
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