One-to-many wireless time-sharing charging circuit and control method thereof

Abstract

The application discloses a one-to-many wireless time-sharing charging circuit and a control method thereof, which comprises a transmitting end circuit and a plurality of receiving end circuits. The receiving end circuit is provided with a corresponding preset charging condition. An identification bit detection circuit is arranged in each receiving end circuit. In a current time-sharing charging period and a next time-sharing charging period, the wireless charging chip charges or discharges the identification bit time-sharing detection circuit, so that the electrical state of the identification bit time-sharing detection circuit does not meet the corresponding preset charging condition in the next time-sharing charging period. The one receiving end circuit simultaneously or time-shares charges a plurality of receiving end circuits. The charging circuit and the control method thereof are simple in design, low in cost and easy to implement.

Description

TECHNICAL FIELD

[0001] The present application 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

[0002] The wireless charging technology of one sending end to one receiving end is very mature at present and is widely used. With the emergence of a large number of small wireless charging devices such as wireless charging earphone cases and wireless charging watches, the demand for simultaneous charging of a single coil sending end to two receiving ends or multiple receiving ends arises. With the gradual emergence of wireless charging services in public places, considering the cost and space, it is impossible to meet the demand for one sending end to separately provide time-sharing wireless charging for multiple receiving ends. SUMMARY

[0003] Therefore, the present application aims to solve the technical problem of overcoming the defect that one sending end cannot separately provide time-sharing wireless charging for multiple receiving ends in the prior art, and to provide a one-to-many wireless time-sharing charging circuit and a control method thereof.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] In a first aspect, the present application provides a one-to-many wireless time-sharing charging circuit, comprising: a sending end circuit and a plurality of receiving end circuits, wherein,

[0006] The sending end circuit has an input end connected with a direct current and an output end connected with the input end of each receiving end circuit through electromagnetic coupling, 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;

[0007] The receiving end circuit has an output end connected with a load, for inducting the magnetic energy and converting the magnetic energy into a power supply voltage;

[0008] 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 supplies power to the load, and during 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.

[0009] Optionally, the one-to-many wireless time-sharing charging circuit further comprises:

[0010] 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 satisfy the corresponding preset charging condition, the identification bit time-sharing detection circuit is used for charging or discharging, so that the electrical state of the identification bit time-sharing detection circuit satisfies the corresponding preset charging condition in the next time-sharing charging period.

[0011] Optionally, the receiving end circuit further comprises a coupling circuit, a rectifier circuit and a wireless charging chip.

[0012] The coupling circuit is connected with the input end of the rectifier circuit, and is used for inducting the magnetic energy to obtain alternating current.

[0013] The rectifier circuit is connected with the input end of the wireless charging chip, and is used for rectifying the alternating current into a power supply voltage.

[0014] The wireless charging chip is connected with the identification bit time-sharing detection circuit and the load respectively, and is used for charging or discharging the identification bit time-sharing detection circuit through the wireless charging chip, so that the electrical state of the identification bit time-sharing detection circuit satisfies or does not satisfy the corresponding preset charging condition in the next time-sharing charging period.

[0015] Optionally, the identification bit time-sharing detection circuit comprises a resistor, a diode and a memory circuit.

[0016] The first end of the memory circuit is connected with the first end of the resistor, the cathode of the diode and the wireless charging chip respectively, the second end of the memory circuit is connected with a ground end, and the second end of the resistor and the anode of the diode are both connected with the wireless charging chip.

[0017] Optionally, the memory circuit comprises a capacitor or an EEPROM or a Flash.

[0018] In the second aspect, an embodiment of the present application provides a one-to-many wireless time-sharing charging control method based on the one-to-many wireless time-sharing charging circuit in the first aspect.

[0019] Each receiving end circuit inducts the magnetic energy and converts the magnetic energy into a power supply voltage.

[0020] In the current time-sharing charging period, each receiving end circuit judges whether the electrical state of the identification bit time-sharing detection circuit inside the receiving end circuit satisfies the corresponding preset charging condition, when the corresponding preset charging condition is satisfied, the receiving end circuit supplies power to the load by using the power supply voltage, and in the power supply process, the identification bit time-sharing detection circuit is used for charging or discharging, so that the electrical state of the identification bit time-sharing detection circuit does not satisfy the corresponding preset charging condition in the next time-sharing charging period.

[0021] Optionally, the one-to-many wireless time-sharing charging control method further comprises:

[0022] 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 satisfy the corresponding preset charging condition, the identification bit time-sharing detection circuit is used for charging or discharging to make the electrical state of the identification bit time-sharing detection circuit satisfy the corresponding preset charging condition in the next time-sharing charging period.

[0023] Optionally, before the step of each receiving end circuit sensing the magnetic energy and converting the magnetic energy into a power supply voltage, further comprising:

[0024] The transmitting end circuit converts the direct current into alternating current, converts the alternating current into magnetic energy, and sends the magnetic energy to each receiving end circuit.

[0025] Optionally, the current time-sharing charging period and the next time-sharing charging period are separated by a preset time interval.

[0026] Optionally, the plurality of receiving end circuits do not have the same preset charging condition.

[0027] The preset charging condition is that 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.

[0028] Optionally, the plurality of receiving end circuits have the same preset charging condition.

[0029] The preset charging condition is that 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.

[0030] Optionally, the electrical state is the voltage value of the capacitor.

[0031] 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 the second end of the resistor high, the wireless charging chip charges the capacitor through the diode.

[0032] The technical scheme of the present application has the following advantages:

[0033] The application provides a one-to-many wireless time-sharing charging circuit and a control method thereof. A receiving end circuit is provided with a corresponding preset charging condition. An identification bit detection circuit is arranged in each receiving end circuit. In a current time-sharing charging period and a next time-sharing charging period, a wireless charging chip charges or discharges the identification bit time-sharing detection circuit, 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. One receiving end circuit simultaneously or time-shares charges multiple receiving end circuits. The one-to-many wireless time-sharing charging circuit and the control method thereof are simple in design, low in cost and easy to implement. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0035] Figure 1 The composition diagram of one specific example of the one-to-many wireless time-sharing charging circuit provided by the embodiment of the present application;

[0036] Figure 2 The composition diagram of another specific example of the one-to-many wireless time-sharing charging circuit provided by the embodiment of the present application;

[0037] Figure 3 The circuit diagram of one specific example of the identification bit time-sharing detection circuit provided by the embodiment of the present application;

[0038] Figure 4 The timing diagram of one specific example of the one-to-many wireless time-sharing charging circuit provided by the embodiment of the present application;

[0039] Figure 5 The timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit provided by the embodiment of the present application;

[0040] Figure 6 The timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit provided by the embodiment of the present application;

[0041] Figure 7 The timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit provided by the embodiment of the present application;

[0042] Figure 8 The timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit provided by the embodiment of the present application;

[0043] Figure 9 The timing diagram of another specific example of the one-to-many wireless time-sharing charging circuit provided by the embodiment of the present application;

[0044] Figure 10 The flow chart of one specific example of the receiving end circuit of the one-to-many wireless time-sharing charging control method provided by the embodiment of the present application;

[0045] Figure 11 The flow chart of another specific example of the receiving end circuit of the one-to-many wireless time-sharing charging control method provided by the embodiment of the present application. DETAILED DESCRIPTION

[0046] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0047] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting” should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, it can be wireless connection, or wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0050] Embodiment 1

[0051] The embodiment of the present application provides a one-to-many wireless time-sharing charging circuit, which is applied to a scenario in which one sending end can simultaneously or time-sharingly perform power delivery to multiple receiving ends.

[0052] As shown in Figure 1 A pair of many wireless time-sharing charging circuit includes: transmitting end circuit 1 and a plurality of receiving end circuit 2. Wherein, the input end of transmitting end circuit 1 is used for connecting with direct current. The output end of transmitting end circuit 1 is connected with the input end of each receiving end circuit 2 through electromagnetic coupling mode. Transmitting end circuit 1 is used for converting direct current into alternating current, then converting alternating current into magnetic energy, and sending to each receiving end circuit 2. The output end of receiving end circuit 2 is used for connecting with load. Receiving end circuit 2 is used for inductively receiving magnetic energy of receiving end circuit 2, and converting magnetic energy into power supply voltage.

[0053] As shown in Figure 2 Each receiving end circuit 2 is internally provided with identification bit time-sharing detection circuit 24. The identification bit time-sharing detection circuit 24 in each receiving end circuit 2 is initialized to low level. Each receiving end circuit 2 converts the inducted magnetic energy into power supply voltage. At the same time, 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 the internal identification bit time-sharing detection circuit 24 meets the corresponding preset charging condition. The preset charging conditions can be the same or different, and setting the corresponding same or different preset charging conditions can achieve the purpose of transmitting end circuit 1 charging multiple receiving end circuits 2 at the same time or in time-sharing mode.

[0054] In a specific embodiment, as shown in Figure 3 The identification bit time-sharing detection circuit 24 includes: resistor R1, diode D1 and memory circuit C1. The first end of memory circuit C1 is connected with the first end of resistor R1, the cathode of diode D1 and wireless charging chip 23 respectively. The second end of memory circuit C1 is connected with ground. The second end of resistor R1 and the anode of diode D1 are connected with wireless charging chip 23. In the embodiment of the application, memory circuit C1 includes any one of non-volatile memory such as capacitor, EEPROM and Flash, or other memory circuits with memory function, which are only used as examples, and are not limited thereto. In actual application, the corresponding memory circuit C1 is selected according to actual needs. The identification bit time-sharing detection circuit 24 provided by the embodiment of the application has simple design and low cost.

[0055] In a specific embodiment, as shown in Figure 2 The receiving end circuit 2 further includes: coupling circuit 21, rectifier circuit 22 and wireless charging chip 23.

[0056] The output end of coupling circuit 21 is connected with the input end of rectifier circuit 22. It is used for converting inducted magnetic energy into alternating current. The output end of rectifier circuit 22 is connected with the input end of wireless charging chip 23. It is used for rectifying alternating current into power supply voltage. Coupling circuit 21 and rectifier circuit 22 are both mature circuits in prior art, and are not limited herein.

[0057] 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 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 period. Specifically, when the wireless charging chip 23 pulls the second end of the resistor R1 low, the capacitor discharges through the resistor R1. When the wireless charging chip 23 makes the second end of the resistor float or pull high, 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 application can select a capacitor, an EEPROM and a Flash, etc. nonvolatile memory, and the cost is low.

[0058] In the embodiment of the application, 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 can be the same or different. The preset charging condition is that when the electrical state of the identification bit time-sharing detection circuit 24 is higher than a 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 a 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. This is only an example, and is not limited thereto. In actual application, a corresponding preset high voltage threshold is selected according to actual needs. The same or different preset charging conditions are set respectively, so as to achieve the purpose of charging the multiple receiving end circuits 2 simultaneously or time-sharing by the transmitting end circuit 1.

[0059] In a specific embodiment, when the electrical state of the identification bit time-sharing detection circuit 24 in the receiving end circuit 2 meets the corresponding preset charging condition in the current time-sharing charging period, the supply voltage supplies power to the load. And 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.

[0060] The current time-sharing charging period and the next time-sharing charging period are separated by a preset time interval. Due to the same or different corresponding preset charging conditions in the receiving end circuit 2, the receiving end circuit 2 can work simultaneously or not work simultaneously. Therefore, the preset time interval between the current time-sharing charging period and the next time-sharing charging period is extended to make the time-sharing communication enter the normal charging logic.

[0061] In the process of prolonging the preset time interval, the transmitting end circuit 1 does not transmit energy to the receiving end circuit 2. For example, when multiple receiving end circuits 2 are not working at the same time, the transmitting end circuit 1 does not receive communication signals for a long time. The transmitting end circuit 1 prolongs the preset time interval, so that the memory circuit C1 returns to the initial state of zero, so that the time-sharing communication enters the logic of normal charging. When multiple receiving end circuits 2 are working at the same time, the transmitting end circuit 1 receives multiple communication signals or random code signals at the same time. The transmitting end circuit 1 prolongs the preset time interval, so that the memory circuit C1 returns to the initial state of zero, so that the transmitting end circuit 1 can re-enter the logic of normal charging of time-sharing communication. Only this example is given, and the preset time interval is selected according to actual needs in actual application.

[0062] It needs to be explained that each identification bit time-sharing detection circuit 24 has a corresponding preset charging condition. The preset charging conditions can be the same or different, and setting the same or different preset charging conditions corresponding to each other can achieve the purpose of charging multiple receiving end circuits 2 by the transmitting end circuit 1 at the same time or in time-sharing.

[0063] As shown in Figure 4 , when there are two receiving ends PRx, and the preset charging conditions of PRx1 and PRx2 are the same (the capacitance changes from 0 to 1). The capacitance of PRx1 and PRx2 in the initial state is zero, and the initial state is not limited here, and can be set according to the actual situation.

[0064] In the t0-t1 time period, the electrical state of the identification bit time-sharing detection circuit 24 meets the preset charging condition of PRx1 and PRx2, and the transmitting end Tx charges PRx1 and PRx2 at the same time. The capacitance of PRx1 and PRx2 changes to 1, and then enters the static stage t1-t2, and the transmitting end Tx does not charge PRx1 and PRx2.

[0065] In the charging process of t0-t1, when it is detected that the capacitance of PRx1 and PRx2 is 1, the wireless charging chip 23 detects that the capacitance of PRx1 and PRx2 in the identification bit time-sharing detection circuit 24 is 1. The respective wireless charging chip 23 respectively pulls down the second end of the resistor R1, 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 meet the corresponding preset charging condition, and the transmitting end Tx does not charge PRx1 and PRx2. In this way, the purpose of time-sharing charging of the transmitting end Tx to two receiving ends PRx at the same time is achieved, and only this example is given, and the corresponding number of transmitting end circuits 2 is selected according to actual needs in actual application.

[0066] As shown in Figure 5As shown, in this embodiment of the present invention, when there are two receiving terminals PRx and the preset charging conditions of PRx1 and PRx2 are different, the preset charging condition of PRx1 is: the capacitance changes from 0 to 1. The preset charging condition of PRx2 is: the capacitance changes from 1 to 0. Initially, the capacitances of PRx1 and PRx2 are zero.

[0067] During the time period t0-t1, the electrical state of the flag bit time-sharing detection circuit 24 meets the preset charging conditions for PRx1. Transmitter Tx charges PRx1, while PRx2 remains inactive. During the charging process, the capacitance of PRx1 reaches 1, and the circuit enters the quiescent phase t1-t2. Transmitter Tx does not charge PRx1 or PRx2, and the capacitance of PRx1 remains at 1.

[0068] During the charging process from t0 to t1, the wireless charging chip 23 of PRx1 detects the electrical state of the capacitor in the time-sharing detection circuit 24 of the flag bit. PRx1's wireless charging chip 23 pulls the second terminal of resistor R1 low, causing the capacitor to discharge through resistor R1. This ensures that the electrical state of the time-sharing detection circuit 24 of the PRx1 flag bit does not meet the corresponding preset charging conditions during the next time-sharing charging cycle t2 to t3. The transmitter Tx does not charge PRx1. This achieves the goal of time-sharing charging of the receiver PRx1 by the transmitter Tx.

[0069] When a receiver PRx3 is added, and the preset charging condition for PRx3 is when the capacitance changes from 0 to 1, a transmitter Tx simultaneously charges the receivers PRx1 and PRx3 in a time-sharing manner. This is only an example and is not intended to be limiting. In actual applications, the number of transmitter circuits 2 can be selected based on actual needs.

[0070] In a specific embodiment, the present invention further includes: in the current time-sharing charging cycle, when the electrical state of the flag bit time-sharing detection circuit 24 within the receiving end circuit 2 does not meet the corresponding preset charging condition, the flag bit time-sharing detection circuit 24 is used to charge or discharge, so that the electrical state of the flag bit time-sharing detection circuit 24 meets the corresponding preset charging condition in the next time-sharing charging cycle.

[0071] like Figure 6 As shown, in the embodiment of the present invention, when there are two receiving terminals PRx, and the preset charging conditions of PRx1 and PRx2 are the same (the capacitance changes from 1 to 0), the capacitance of PRx1 and PRx2 is zero in the initial state.

[0072] During the time period t0-t1, the electrical state of the identification bit time-sharing detection circuit 24 does not meet the preset charging conditions of PRx1 and PRx2. During the period t0-t1, the wireless charging chip 23 detects the electrical state of the capacitor in the identification bit time-sharing detection circuit 24. The wireless charging chip 23 floats or pulls the second end of the resistor high, and the wireless charging chip charges the capacitor through diode D1.

[0073] The capacitances of PRx1 and PRx2 become 1. Then, during the quiescent phase t1-t2, the transmitter Tx does not charge PRx1 and PRx2. The capacitances of PRx1 and PRx2 are 1, ensuring that during the time period t2-t3, the electrical state of the identification bit time-sharing detection circuit 24 satisfies the preset charging conditions for PRx1 and PRx2. The transmitter Tx simultaneously and time-sharingly charges PRx1 and PRx2. This allows a single transmitter Tx to simultaneously and time-sharingly charge both receivers PRx1 and PRx2 when the corresponding preset charging conditions are not met. This is merely an example and is not intended to be limiting. In actual applications, the appropriate number of transmitter circuits 2 may be selected based on actual needs.

[0074] like Figure 7 As shown, in this embodiment of the present invention, when there are two receiving terminals PRx and the preset charging conditions of PRx1 and PRx2 are different, the preset charging condition of PRx1 is: the capacitance changes from 0 to 1. The preset charging condition of PRx2 is: the capacitance changes from 1 to 0. Initially, the capacitances of PRx1 and PRx2 are zero.

[0075] During the time period t0-t1, Tx charges the receiver PRx1. Simultaneously, the wireless charging chip 23 of PRx2 detects the electrical state of the capacitor in the time-sharing detection circuit 24 of the PRx2 flag.

[0076] The wireless charging chip 23 of PRx2 floats or pulls the second end of the resistor high, charging the capacitor via diode D1. The capacitance of PRx2 becomes 1, and the device enters a dormant phase t1-t2, during which the transmitter Tx does not charge PRx1 or PRx2. The capacitance of PRx1 and PRx2 is 1, allowing the wireless charging chip 23 to detect the electrical state of the capacitor in the identification bit time-sharing detection circuit 24 during the time period t2-t3. Each wireless charging chip 23 pulls the second end of resistor R1 low. The capacitor discharges through resistor R1, causing the electrical state of the identification bit time-sharing detection circuit 24 to meet the corresponding preset charging condition. At this point, Tx charges the receiver PRx2. This allows a single transmitter Tx to simultaneously time-share charge both receivers PRx1 and PRx2 when the preset charging condition is not met. This is merely an example and is not intended to be limiting. In actual applications, the appropriate number of transmitter circuits 2 should be selected based on actual needs.

[0077] In another embodiment, 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 satisfies the corresponding preset charging condition, the power supply voltage is used to power the load. And in the process of power supply, 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 satisfy the corresponding preset charging condition. 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 in the next time-sharing charging period, the electrical state of the identification bit time-sharing detection circuit 24 satisfies the corresponding preset charging condition.

[0078] As shown in FIG. 1, the embodiment of the present application is used for time-sharing charging two receiving ends PRx1 and PRx2. Figure 8 As shown in FIG. 2, when there are two receiving ends PRx, and the preset charging conditions of PRx1 and PRx2 are the same (the capacitance changes from 0 to 1).

[0079] In the t0-t1 period, the electrical state of the identification bit time-sharing detection circuit 24 satisfies the preset charging condition of PRx1 and PRx2, and the transmitting end Tx charges PRx1 and PRx2 at the same time. The capacitance of PRx1 and PRx2 changes to 1, and then enters the idle stage t1-t2. The transmitting end Tx does not charge PRx1 and PRx2, and the capacitance of PRx1 and PRx2 is 1.

[0080] The wireless charging chip 23 detects the electrical state of the capacitance in the identification bit time-sharing detection circuit 24. The respective wireless charging chip 23 respectively pulls down the second end of the resistor R1. The capacitance 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 end Tx does not charge PRx1 and PRx2. Then enter the t3-t4 idle stage, and repeat the above steps to complete the purpose of the transmitting end circuit charging two receiving ends PRx1 and PRx2 at the same time. Only as an example, not limited thereto, in actual application, the corresponding number of transmitting end circuits 2 is selected according to actual needs.

[0081] As shown in FIG. 3, the embodiment of the present application is used for time-sharing charging two receiving ends PRx1 and PRx2. Figure 9 As shown in FIG. 4, when there are two receiving ends PRx, and the preset charging conditions of PRx1 and PRx2 are different, the preset charging condition of PRx1 is that the capacitance changes from 0 to 1. The preset charging condition of PRx2 is that the capacitance changes from 1 to 0. The initial state of the capacitance of PRx1 and PRx2 is zero.

[0082] In the t0-t1 period, the electrical state of the identification bit time-sharing detection circuit 24 satisfies the preset charging condition of PRx1, and the transmitting end Tx charges PRx1. At this time, PRx2 is not charged.

[0083] 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 pulls the second end of the resistor R1 of PRx1 low. The capacitor is discharged through the resistor R1 to make the electrical state of the PRx1 identification bit time-sharing detection circuit 24 not meet the corresponding preset charging condition in the next time-sharing charging period t2-t3, and the transmitting end Tx does not charge PRx1.

[0084] The wireless charging chip 23 of PRx2 pulls the second end of the resistor high or high. The wireless charging chip 23 charges the capacitor through the diode D1 to make the electrical state of the PRx2 identification bit time-sharing detection circuit 24 meet the corresponding preset charging condition in the next time-sharing charging period t2-t3. Then enter the static phase t3-t4, the transmitting end Tx does not charge PRx1 and PRx2, and the above steps are repeated to complete the purpose of the transmitting end circuit charging two receiving ends PRx1 and PRx2 in time-sharing. Only as an example, not limited thereto, in actual application, the corresponding number of transmitting end circuits 2 is selected according to actual needs.

[0085] The one-to-many wireless time-sharing charging circuit provided by the embodiment of the application sets different preset charging conditions for the receiving end circuit 2. The identification bit detection circuit 24 is arranged in each receiving end circuit 2. In the current time-sharing charging period and the next time-sharing charging period, the wireless charging chip 23 charges or discharges the identification bit time-sharing detection circuit 24 to make the electrical state of the identification bit time-sharing detection circuit 24 meet or not meet the corresponding preset charging condition in the next time-sharing charging period. Complete a receiving end circuit 1 charging multiple receiving end circuits 2 at the same time or in time-sharing. At the same time, the memory circuit C1 provided by the embodiment of the application can use a capacitor, an EEPROM or a Flash nonvolatile memory. The one-to-many wireless time-sharing charging circuit provided by the embodiment of the application is simple in design, low in cost and easy to implement.

[0086] Embodiment 2

[0087] The embodiment of the application provides a one-to-many wireless time-sharing charging control method based on the one-to-many wireless time-sharing charging circuit of embodiment 1, as shown in the figure, the control method comprises the following steps: Figure 10

[0088] Step S1: Each receiving end circuit converts the magnetic energy into a power supply voltage.

[0089] ​Step S2: In the current time-sharing charging period, each of the receiving end circuits judges whether the electrical state of the identification bit time-sharing detection circuit inside it meets the corresponding preset charging condition, when the corresponding preset charging condition is met, the receiving end circuit supplies the power supply voltage to the load, and in the process of power supply, 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.

[0090] In the embodiment of the application, the electrical state is the capacitor voltage value, and the capacitor voltage value can be converted into a high / low level value. The preset charging conditions can be the same or different. The preset charging condition is that when the electrical state of the identification bit time-sharing detection circuit is higher than the 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 the preset high voltage threshold, the receiving end circuit supplies power to the load, and the electrical state is the voltage value of the capacitor. This is only an example, and is not limited thereto. In actual application, the corresponding preset high voltage threshold is selected according to actual needs.

[0091] In the embodiment of the application, the preset time interval is between the current time-sharing charging period and the next time-sharing charging period. Due to the same or different corresponding preset charging conditions in the receiving end circuit, the receiving end circuit can work simultaneously or not work simultaneously. Therefore, the preset time interval between the current time-sharing charging period and the next time-sharing charging period is extended to make the time-sharing communication normal charging logic.

[0092] In the process of extending the preset time interval, the transmitting end circuit does not transmit energy to the receiving end circuit. For example, when multiple receiving end circuits do not work simultaneously, the transmitting end circuit does not receive communication signals for a long time. The transmitting end circuit extends the preset time interval, so that the memory circuit returns to the initial state of zero, so that the transmitting end circuit can re-enter the time-sharing communication normal charging logic. When multiple receiving end circuits work simultaneously, the transmitting end circuit receives multiple communication signals or random code signals at the same time. The transmitting end circuit extends the preset time interval, so that the memory circuit returns to the initial state of zero, so that the transmitting end circuit can re-enter the time-sharing communication normal charging logic. This is only an example, and is not limited thereto. In actual application, the corresponding preset time interval is selected according to actual needs.

[0093] In a specific embodiment, the control method provided by the embodiment of the application 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.

[0094] In a specific embodiment, as shown in FIG. 1, before step S1, there is also step S0: the transmitting end circuit converts direct current into alternating current, then converts the alternating current into magnetic energy, and sends the magnetic energy to each receiving end circuit. Figure 11

[0095] The one-to-many wireless time-sharing charging control method provided by the embodiments of the present application sets different preset charging conditions for the receiving end circuits, sets an identification bit detection circuit in each receiving end circuit, and charges or discharges the identification bit time-sharing detection circuit by the wireless charging chip 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. The one receiving end circuit can charge multiple receiving end circuits at the same time or in time-sharing manner. The control method provided by the embodiments of the present application is simple to operate and easy to implement.

[0096] Obviously, the above embodiments are merely examples for clear illustration, and are not intended to limit the embodiments. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.​

Claims

1. A one-to-many wireless time-division charging circuit, comprising: The application relates to a wireless charging system, which comprises a transmitting end circuit (1) and a plurality of receiving end circuits (2), wherein the input end of the transmitting end circuit (1) is connected with a direct current, the output end of the transmitting end circuit (1) is connected with the input end of each receiving end circuit (2) through electromagnetic coupling, the transmitting end circuit (1) 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 (2); the output end of each receiving end circuit (2) is connected with a load, the receiving end circuit (2) is used for inducting the magnetic energy and converting the magnetic energy into a power supply voltage; in a current time-sharing charging period, when the electrical state of an identification bit time-sharing detection circuit (24) inside the receiving end circuit (2) meets a corresponding preset charging condition, the power supply voltage is used for supplying power to the load, and during 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; the plurality of receiving end circuits (2) do not have the same preset charging condition, or the plurality of receiving end circuits (2) have the same preset charging condition; the preset charging condition is that when the electrical state of the identification bit time-sharing detection circuit (24) is higher than a preset high-voltage threshold, the receiving end circuit (2) is used for supplying 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) is used for supplying power to the load; wherein the receiving end circuit (2) comprises a coupling circuit (21), a rectifier circuit (22) and a wireless charging chip (23), wherein the output end of the coupling circuit (21) is connected with the input end of the rectifier circuit (22), the coupling circuit (21) is used for inducting the magnetic energy and obtaining alternating current; the output end of the rectifier circuit (22) is connected with the input end of the wireless charging chip (23), the rectifier circuit (22) is used for rectifying the alternating current into a power supply voltage; 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) through the wireless charging chip (23), 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; wherein the identification bit time-sharing detection circuit (24) comprises a resistor (R1), a diode (D1) and a memory circuit (C1), the first end of the memory circuit (C1) is connected with the first end of the resistor (R1), the cathode of the diode (D1) and the wireless charging chip (23) respectively, the second end of the memory circuit (C1) is connected with a grounding end, and the second end of the resistor (R1) and the anode of the diode (D1) are connected with the wireless charging chip (23); the memory circuit (C1) comprises a capacitor; the current time-sharing charging period and the next time-sharing charging period are separated by a preset time interval. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ When multiple receiving end circuits (2) are not working at the same time, the transmitting end circuit (1) does not receive communication signals for a long time, the transmitting end circuit (1) will prolong the preset time interval, so that the memory circuit returns to the initial state of zero, so that the time-sharing communication enters the logic of normal charging; When multiple receiving end circuits (2) are working at the same time, the transmitting end circuit (1) receives multiple communication signals or random code signals at the same time, the transmitting end circuit (1) will prolong the preset time interval, so that the memory circuit returns to the initial state of zero, so that the transmitting end circuit (1) can re-enter the logic of normal charging of time-sharing communication.

2. The one-to-many wireless time-sharing charging circuit according to claim 1, wherein, Also 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 meet 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.

3. A one-to-many wireless time-sharing charging control method, characterized by, The control method of the one-to-many wireless time-sharing charging circuit according to any one of claims 1-2, the control method comprising: Each of the receiving end circuits induces the magnetic energy and converts the magnetic energy into a power supply voltage; In the current time-sharing charging period, each of the receiving end circuits judges whether the electrical state of the identification bit time-sharing detection circuit inside it meets the corresponding preset charging condition, when the corresponding preset charging condition is met, the receiving end circuit supplies power to the load with the power supply voltage, and in the power supply process, the identification bit time-sharing detection circuit is used for charging or discharging, so that the electrical state of the identification bit time-sharing detection circuit does not meet the corresponding preset charging condition in the next time-sharing charging period, wherein the current time-sharing charging period and the next time-sharing charging period are separated by a preset time interval; When multiple receiving end circuits are not working at the same time, the transmitting end circuit does not receive communication signals for a long time, the transmitting end circuit will prolong the preset time interval, so that the memory circuit returns to the initial state of zero, so that the time-sharing communication enters the logic of normal charging; When multiple receiving end circuits are working at the same time, the transmitting end circuit receives multiple communication signals or random code signals at the same time, the transmitting end circuit will prolong the preset time interval, so that the memory circuit returns to the initial state of zero, so that the transmitting end circuit can re-enter the logic of normal charging of time-sharing communication.

4. The one-to-many wireless time division charging control method according to claim 3, wherein The control method further comprises: 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 the electrical state of the identification bit time-sharing detection circuit meets the corresponding preset charging condition in the next time-sharing charging period.

5. The one-to-many wireless time division charging control method according to claim 4, wherein Before the step of each of the receiving end circuits inducing the magnetic energy and converting the magnetic energy into a power supply voltage, further comprising: The transmitting end circuit converts direct current into alternating current, and then converts the alternating current into magnetic energy and sends it to each of the receiving end circuits.

6. The one-to-many wireless time-sharing charging control method according to any one of claims 3-5, characterized in that, The electrical state is the voltage value of the capacitor.

7. The one-to-many wireless time division charging control method according to claim 6, wherein When the second end of the resistor is pulled low by the wireless charging chip, the capacitor is discharged through the resistor; when the second end of the resistor is floating or pulled high by the wireless charging chip, the wireless charging chip charges the capacitor through the diode.

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