CN214045191U - Wireless charging circuit, system and electronic equipment - Google Patents

Abstract

The utility model relates to a wireless charging circuit, system and electronic equipment. The wireless charging circuit includes: the device comprises an electric energy receiving module, a voltage reduction module and a charge pump module; the voltage reduction module is electrically connected with the electric energy receiving module, the charge pump module is electrically connected with the voltage reduction module, and the charge pump module is electrically connected with the battery to be charged; the voltage reduction module comprises a first group of switches, a second group of switches and a first capacitor; in the first state, the first group of switches are on, the second group of switches are off, and in the second state, the first group of switches are off, and the second group of switches are on; the charge pump module comprises a second capacitor, a third capacitor and a fourth capacitor, wherein a battery to be charged is electrically connected with a first end of the fourth capacitor, and a second end of the fourth capacitor is electrically connected; if the second capacitor is in the third state, the second capacitor, the third capacitor and the fourth capacitor are connected in series; and if the second capacitor is in the fourth state, the second capacitor, the third capacitor and the fourth capacitor are connected in parallel. The wireless charging circuit can reduce the cost of high-power charging.

Description

Wireless charging circuit, system and electronic equipment

Technical Field

The utility model relates to a wireless charging technology field especially relates to wireless charging circuit, system and electronic equipment.

Background

The wireless quick charging technology can reduce charging time and improve the experience of customers while meeting the charging convenience of the customers. In a common wireless quick charging circuit, a voltage reduction charging chip can be adopted for high-voltage quick charging, but the charging efficiency is low, and larger charging power cannot be realized; the load switch can be used for realizing low-voltage quick charging, but a special charging wire and a charging interface are needed, and larger charging power cannot be realized. Therefore, a wireless quick charging circuit adopting an 1/2 charge pump is provided, and high charging power is realized.

1/2 the input current of the charge pump is 1/2 of the output current, however, as the battery capacity of the terminal equipment increases, the charging current increases, and when the input current of the charge pump exceeds 3A, the wire needs to be added with chips, resulting in increased cost.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems or at least partially solve the technical problems, the present disclosure provides a wireless charging circuit, a system and an electronic device, which can reduce the cost of high-power charging.

In a first aspect, the utility model discloses a wireless charging circuit, include: the device comprises an electric energy receiving module, a voltage reduction module and a charge pump module;

the electric energy receiving module is coupled with the electric energy transmitting module and is used for receiving the wireless signals transmitted by the electric energy transmitting module and generating electric signals; the input end of the voltage reduction module is electrically connected with the electric energy receiving module, the voltage reduction module is used for reducing the voltage of the electric signal to a target voltage value, the input end of the charge pump module is electrically connected with the output end of the voltage reduction module, the output end of the charge pump module is electrically connected with a battery to be charged, and the charge pump module is used for reducing the voltage of the electric signal of the target voltage value and outputting the electric signal to the battery to be charged;

the voltage reduction module comprises a first group of switches, a second group of switches and a first capacitor; if the voltage reduction module is in a first state, the first group of switches are turned on, the second group of switches are turned off, and the electric energy receiving module charges the first capacitor and the charge pump module; if the voltage reduction module is in a second state, the first group of switches is switched off, the second group of switches is switched on, and the first capacitor charges the charge pump module;

the charge pump module comprises a second capacitor, a third capacitor and a fourth capacitor, the battery to be charged is electrically connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is grounded; if the charge pump module is in a third state, the second capacitor, the third capacitor and the fourth capacitor are connected in series; and if the charge pump module is in a fourth state, the second capacitor, the third capacitor and the fourth capacitor are connected in parallel.

Optionally, the charge pump module further comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch;

the first end of the first switch is electrically connected with the output end of the voltage reduction module, the second end of the first switch is electrically connected with the first end of the second switch and the first end of the second capacitor, the second end of the second capacitor is electrically connected with the first end of the third switch and the first end of the fourth switch, the second end of the third switch is electrically connected with the first end of the third capacitor and the first end of the fifth switch, the second end of the third capacitor is electrically connected with the first end of the sixth switch and the first end of the seventh switch, the second end of the seventh switch is electrically connected with the first end of the fourth capacitor, the second end of the second switch and the second end of the fifth switch, and the second end of the fourth switch and the second end of the sixth switch are both grounded.

Optionally, the system further comprises a control module; the first end of the control module is respectively and electrically connected with the control end of the first switch, the control end of the third switch and the control end of the seventh switch; and the second end of the control module is respectively and electrically connected with the control end of the second switch, the control end of the fourth switch, the control end of the fifth switch and the control end of the sixth switch.

Optionally, if the charge pump module is in the third state, the first switch, the third switch, and the seventh switch are turned on, and the second switch, the fourth switch, the fifth switch, and the sixth switch are turned off;

if the charge pump module is in the fourth state, the second switch, the fourth switch, the fifth switch and the sixth switch are turned on, and the first switch, the third switch and the seventh switch are turned off.

Optionally, the charge pump module further comprises a fifth capacitor; the first end of the fifth capacitor is electrically connected with the first end of the first switch, and the second end of the fifth capacitor is grounded.

Optionally, the first set of switches includes an eighth switch and a ninth switch, the second set of switches includes a tenth switch and an eleventh switch, and the voltage reduction module further includes an inductor and a sixth capacitor;

a first end of the eighth switch is electrically connected with the power receiving module, and a second end of the eighth switch is electrically connected with a first end of the first capacitor and a first end of the tenth switch respectively; a second end of the tenth switch is electrically connected to a first end of the ninth switch and the inductor, respectively, and a second end of the ninth switch is electrically connected to a second end of the first capacitor and a first end of the eleventh switch, respectively; the second end of the inductor is electrically connected with the first end of the sixth capacitor and the input end of the charge pump module respectively, and the second end of the eleventh switch and the second end of the sixth capacitor are both grounded.

Optionally, if the buck module is in the first state or the second state, the switching node voltage Vsw and the input voltage Vin of the buck module satisfy Vsw ═ Vin/2; if the buck module is in a fifth state, the eighth switch and the tenth switch are turned on, the ninth switch and the eleventh switch are turned off, and the switch node voltage Vsw and the input voltage Vin of the buck module meet Vsw-Vin; if the buck module is in the sixth state, the eighth switch and the tenth switch are turned off, the ninth switch and the eleventh switch are turned on, and the switch node voltage Vsw of the buck module satisfies Vsw-0.

Optionally, the system further comprises a rectification module; the input end of the rectifying module is electrically connected with the output end of the electric energy receiving module, and the output end of the rectifying module is electrically connected with the input end of the voltage reducing module; the rectifying module is used for converting the alternating current signal output by the electric energy receiving module into a direct current signal.

In a second aspect, an embodiment of the present invention provides a wireless charging system, including a wireless adapter and any one of the wireless charging circuits provided in the first aspect;

the wireless adapter comprises an electric energy transmitting module, the electric energy transmitting module is coupled with the wireless charging circuit, and the battery to be charged is electrically connected with the wireless charging circuit.

In a third aspect, an embodiment of the present invention provides an electronic device, including a battery to be charged and any one of the wireless charging circuits provided in the first aspect;

the wireless charging circuit is electrically connected with the battery to be charged.

The embodiment of the utility model provides a technical scheme compares with prior art and has following advantage:

in the technical scheme provided by the embodiment of the utility model, the voltage reduction module comprises a first group of switches, a second group of switches and a first capacitor; if the voltage reduction module is in the first state, the first group of switches are turned on, the second group of switches are turned off, and the electric energy receiving module charges the first capacitor and the charge pump module; if the voltage reduction module is in a second state, the first group of switches is disconnected, the second group of switches is connected, the first capacitor charges the charge pump module, and the voltage reduction module realizes primary voltage reduction through the first capacitor; the charge pump module comprises a second capacitor, a third capacitor and a fourth capacitor, a battery to be charged is electrically connected with a first end of the fourth capacitor, and a second end of the fourth capacitor is grounded; if the charge pump module is in the third state, the second capacitor, the third capacitor and the fourth capacitor are connected in series, the three capacitors divide the voltage to enable the output voltage of the charge pump module to be 1/3 of the input voltage, if the charge pump module is in the fourth state, the second capacitor, the third capacitor and the fourth capacitor are connected in parallel, currents output by the three capacitors are combined and then output, the output current of the charge pump module is 3 times of the input current, and the amplification factor of the charge pump module on the currents is large. The embodiment of the utility model provides a wireless charging circuit can realize the two-stage step-down through step-down module and charge pump module for wireless charging circuit can regard as input current with a less current value, produces great charging current, realizes high-power charging promptly, and in addition, the charge pump module is great to input current's magnification, can further reduce input current, consequently, need not to set up extra chip, is favorable to reducing the cost that high-power was charged.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

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 for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a wireless charging circuit according to an embodiment of the present invention;

fig. 2 is an equivalent circuit diagram of the charge pump module in the third state according to the embodiment of the present invention;

fig. 3 is an equivalent circuit diagram of a charge pump module in a fourth state according to an embodiment of the present invention;

fig. 4 is an equivalent circuit diagram of the voltage reduction module in the first state according to the embodiment of the present invention;

fig. 5 is an equivalent circuit diagram of the voltage reduction module in the second state according to the embodiment of the present invention;

fig. 6 is an equivalent circuit diagram of the voltage reduction module in the fifth state according to the embodiment of the present invention;

fig. 7 is an equivalent circuit diagram of the voltage reduction module in the sixth state according to the embodiment of the present invention;

fig. 8 is a schematic diagram of a waveform of an output voltage of a voltage reduction module according to an embodiment of the present invention;

fig. 9 is a schematic waveform diagram of an output voltage of another voltage reduction module according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a wireless charging system according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the present invention may be more clearly understood, the aspects of the present invention will be further described below. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the invention may be practiced in other ways than those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, and not all of the embodiments.

In the prior art, a high-power charging circuit mainly includes three types: the high-voltage quick charging circuit comprises a voltage reduction type conversion circuit, wherein the voltage reduction type conversion circuit can reduce voltage and transmit an electric signal after voltage reduction to a battery of a terminal device, the charging power which can be realized by the high-voltage quick charging circuit is about 24W, the charging efficiency is not more than 89%, the energy loss is concentrated on the loss of a transistor and an inductor in the voltage reduction type conversion circuit, and high-power quick charging cannot be realized. The other type is a low-voltage quick charging circuit which comprises a load switch, wherein the load switch directly transmits an electric signal output by the adapter to a battery of the terminal equipment, the charging power of the low-voltage quick charging circuit is about 25W, the charging efficiency is as high as 95%, but special charging wires and charging interfaces are needed, and high-power quick charging cannot be realized. The last one is a high-voltage direct charging circuit, which comprises an 1/2-time voltage-reducing charge pump, namely, a 1/2-time voltage-reducing charge pump can reduce the input voltage by half and then output the voltage, and transmit the voltage to a battery of a terminal device, so that the rapid charging of charging power such as 40W, 50W and 100W can be realized, and the highest charging efficiency can reach 98%. As the battery capacity of the terminal equipment is increased, the charging current is continuously increased, and when the 1/2 times of input current of the buck charge pump exceeds 3A, the wire needs to be provided with an additional chip, so that the cost is increased.

In view of this, the embodiment of the present invention provides a wireless charging circuit, fig. 1 is the embodiment of the present invention provides a structural schematic diagram of a wireless charging circuit, as shown in fig. 1, the wireless charging circuit 100 includes: a power receiving module 110, a voltage dropping module 120, and a charge pump module 130.

The power receiving module 110 is coupled to the power transmitting module, and is configured to receive the wireless signal transmitted by the power transmitting module and generate an electrical signal. The input end of the voltage reduction module 120 is electrically connected to the power receiving module 110, and the voltage reduction module 120 is configured to reduce the voltage of the electrical signal to a target voltage value. The input end of the charge pump module 130 is electrically connected to the output end of the voltage reduction module 120, the output end of the charge pump module 130 is electrically connected to the battery 310 to be charged, and the charge pump module 130 is configured to reduce the voltage of the electrical signal of the target voltage value and output the reduced voltage to the battery 310 to be charged.

The voltage reducing module 120 includes a first switch, a second switch and a first capacitor C1, if the voltage reducing module 120 is in the first state, the first switch is turned on, the second switch is turned off, and the power receiving module 110 charges the first capacitor C1 and the charge pump module 130; if the voltage dropping module 120 is in the second state, the first set of switches is turned off, the second set of switches is turned on, and the first capacitor C1 charges the charge pump module 130.

The charge pump module 130 includes a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, the battery 310 to be charged is electrically connected to a first terminal of the fourth capacitor C4, and a second terminal of the fourth capacitor C4 is grounded. If the charge pump module 130 is in the third state, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are connected in series; if the charge pump module 130 is in the fourth state, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are connected in parallel.

Specifically, the power receiving module 110 may be a power receiving coil, and the power receiving coil may be any shape such as a rectangle, a circle, or a triangle, as long as it is matched with the power transmitting module and generates electric induction, magnetic resonance, or interaction of electromagnetic waves with the power transmitting module. The coil diameter, the line width and the material of the electric energy receiving coil can be flexibly set according to actual conditions. The input end of the power receiving module 110 is coupled to the power transmitting module (not shown in the figure), and the power receiving module 110 can receive the wireless signal transmitted by the power transmitting module and generate a corresponding electrical signal. The electrical signal may be an alternating current signal or a direct current signal.

The voltage of the electrical signal received by the voltage-reducing module 120 is Vin, the current is Iin, if the voltage-reducing module 120 is in the first state, the first group of switches is turned on, the second group of switches is turned off, the electrical energy is stored in the first capacitor C1 in the voltage-reducing module 120, and the voltage-reducing module 120 is in the charging state until the first capacitor C1 is full. If the voltage-reducing module 120 is in the second state, the first group of switches is turned off, the second group of switches is turned on, the electric energy stored in the first capacitor C1 is gradually released, and the voltage-reducing module 120 is in the discharging state. No matter the voltage-reducing module 120 is in the charging state or the discharging state, the voltage-reducing module 120 can reduce the voltage Vin of the electrical signal to the voltage Vout, that is, the output voltage Vout < Vin and the output current Iout > Iin of the voltage-reducing module 120, and transmit the electrical signal of the voltage Vout to the charge pump module 130, so that the voltage-reducing module 120 realizes a one-stage voltage-reducing function.

The voltage of the electrical signal received by the charge pump module 130 is Vout, the current is Iout, when the charge pump module 130 is in the third state, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are connected in series, the electrical energy is stored in the second capacitor C2, the third capacitor C3 and the fourth capacitor C4, and the charge pump module 130 is in the charging state until the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are fully charged. At this time, the voltages of the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all Vout/3, the battery 310 to be charged is electrically connected to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is grounded, so that the output voltage of the charge pump module 130 is the same as the voltage of the fourth capacitor C4, i.e., Vout/3. When the charge pump module 130 is in the fourth state, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are connected in parallel, and voltages of the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are all Vout/3, electric energy stored in the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 is gradually released, and the charge pump module 130 is in the discharging state, at this time, currents output by the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are the same, and an output current of the charge pump module 130 is a sum of currents output by the second capacitor C2, the third capacitor C3, and the fourth capacitor C4, that is, 3Iout, so that an amplification factor of the charge pump module 130 on an input current is large, and the input current can be further reduced without providing an additional chip.

The embodiment of the utility model provides a technical scheme realizes one-level step-down function through step-down module 120, has realized second grade step-down function through charge pump module 130, and wireless charging circuit 100 can realize the two-stage step-down for wireless charging circuit 100 can regard as input current with a less current value, produces great charging current, realizes high-power charging promptly. The charge pump module 130 can amplify the current with a larger magnification, thereby reducing the input current, and therefore, no additional chip is required, which is beneficial to reducing the cost of high-power charging.

Optionally, with continued reference to fig. 1, the charge pump module 130 further includes a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, and a seventh switch Q7.

A first end of the first switch Q1 is electrically connected to the output end of the buck module 120, a second end of the first switch Q1 is electrically connected to a first end of the second switch Q2 and a first end of the second capacitor C2, a second end of the second capacitor C2 is electrically connected to a first end of the third switch Q3 and a first end of the fourth switch Q4, a second end of the third switch Q3 is electrically connected to a first end of the third capacitor C3 and a first end of the fifth switch Q5, a second end of the third capacitor C3 is electrically connected to a first end of the sixth switch Q6 and a first end of the seventh switch Q7, a second end of the seventh switch Q7 is electrically connected to a first end of the fourth capacitor C4, a second end of the second switch Q2, a second end of the fifth switch Q5, and second ends of the fourth switch Q4 and the sixth switch Q6 are both grounded.

Specifically, series-parallel connection of the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 can be controlled by controlling on and off of the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6 and the seventh switch Q7. For example, if the first switch Q1, the third switch Q3 and the seventh switch Q7 are turned on, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are turned off, and the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are connected in series; if the first switch Q1, the third switch Q3 and the seventh switch Q7 are turned off, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are turned on, and the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are connected in parallel.

Optionally, with continued reference to fig. 1, the wireless charging circuit 100 further includes a control module 140.

A first end of the control module 140 is electrically connected to a control end of the first switch Q1, a control end of the third switch Q3, and a control end of the seventh switch Q7, respectively; a second terminal of the control module 140 is electrically connected to a control terminal of the second switch Q2, a control terminal of the fourth switch Q4, a control terminal of the fifth switch Q5, and a control terminal of the sixth switch Q6, respectively.

Specifically, the first terminal of the control module 140 can send control signals to the control terminal of the first switch Q1, the control terminal of the third switch Q3, and the control terminal of the seventh switch Q7, thereby controlling whether the first switch Q1, the third switch Q3, and the seventh switch Q7 are in an on state or an off state. The second terminal of the control module 140 is capable of sending control signals to the control terminal of the second switch Q2, the control terminal of the fourth switch Q4, the control terminal of the fifth switch Q5, and the control terminal of the sixth switch Q6, thereby controlling whether the second switch Q2, the fourth switch Q4, the fifth switch Q5, and the sixth switch Q6 are in an on state or an off state. The embodiment of the utility model provides a can realize second electric capacity C2, third electric capacity C3 and fourth electric capacity C4's cluster, parallelly connected through two control signal, reduce the quantity of signal line, simplify wireless charging circuit 100's the line of walking.

The first terminal of the control module 140 outputs a first control signal, the first switch Q1, the third switch Q3 and the seventh switch Q7 are in a conducting state under the action of the first control signal, the second terminal of the control module 140 outputs a second control signal, and the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are in a conducting state under the action of the second control signal. For example, when the first switch Q1, the third switch Q3, and the seventh switch Q7 receive the first control signal, and the second switch Q2, the fourth switch Q4, the fifth switch Q5, and the sixth switch Q6 do not receive the second control signal, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are connected in series, and the charge pump module 130 is in a charging state; when the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 receive the second control signal and the first switch Q1, the third switch Q3 and the seventh switch Q7 do not receive the first control signal, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are in a discharging state, so that the charge-discharge state of the charge pump module 130 is switched.

Optionally, fig. 2 is an equivalent circuit diagram of the charge pump module in the third state provided by the embodiment of the present invention, and fig. 3 is an equivalent circuit diagram of the charge pump module in the fourth state provided by the embodiment of the present invention, in combination with fig. 2 and fig. 3, if the charge pump module 130 is in the third state, the first switch Q1, the third switch Q3 and the seventh switch Q7 are turned on, and the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are turned off. If the charge pump module 130 is in the fourth state, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are turned on, and the first switch Q1, the third switch Q3 and the seventh switch Q7 are turned off.

Specifically, if the charge pump module 130 is in the third state, that is, the charge pump module 130 is in the charging state, the first switch Q1, the third switch Q3 and the seventh switch Q7 are turned on, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are turned off, the equivalent resistance of the first switch Q1 is R1, the equivalent resistance of the third switch Q3 is R3, the equivalent resistance of the seventh switch Q7 is R7, and the first capacitor C1, the second capacitor C2 and the third capacitor C3 are connected in series, as shown in fig. 2. If the charge pump module 130 is in the fourth state, that is, the charge pump module 130 is in the discharging state, the first switch Q1, the third switch Q3 and the seventh switch Q7 are turned off, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 are turned on, the equivalent resistance of the second switch Q2 is R2, the equivalent resistance of the fourth switch Q4 is R4, the equivalent resistance of the fifth switch Q5 is R5, the equivalent resistance of the sixth switch Q6 is R6, and the first capacitor C1, the second capacitor C2 and the third capacitor C3 are connected in parallel, as shown in fig. 3.

Optionally, with continued reference to fig. 1, the charge pump module 130 further includes a fifth capacitor C5, a first terminal of the fifth capacitor C5 is electrically connected to the first terminal of the first switch Q1, and a second terminal of the fifth capacitor C5 is grounded.

Specifically, the second end of the fifth capacitor C5 is grounded, and is capable of releasing a high-frequency signal in the electrical signals received by the input end of the charge pump module 130 to ground to filter the high-frequency signal, so that the fifth capacitor C5 is capable of isolating the high-frequency signal and releasing the high-frequency signal to ground, so that other electronic components in the wireless charging circuit 100 are protected from the high-frequency signal.

Optionally, the switch comprises an N-type field effect transistor.

Specifically, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6 and the seventh switch Q7 may be N-type field effect transistors, and when the control terminals of the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6 and the seventh switch Q7 receive a high level signal, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6 and the seventh switch Q7 are turned on. In other embodiments, a part of the switches may also be N-type fets, which is not limited in the embodiments of the present invention.

Optionally, with continued reference to fig. 1, the first set of switches includes an eighth switch Q8 and a ninth switch Q9, the second set of switches includes a tenth switch Q10 and an eleventh switch Q11, and the buck module 120 further includes an inductor L and a sixth capacitor C6.

A first end of the eighth switch Q8 is electrically connected to the power receiving module 110, a second end of the eighth switch Q8 is electrically connected to a first end of the first capacitor C1 and a first end of the tenth switch Q10, respectively, a second end of the tenth switch Q10 is electrically connected to a first end of the ninth switch Q9 and the inductor L, respectively, a second end of the ninth switch Q9 is electrically connected to a second end of the first capacitor C1 and a first end of the eleventh switch Q11, respectively, a second end of the inductor L is electrically connected to a first end of the sixth capacitor C6 and the input end of the charge pump module 130, and a second end of the eleventh switch Q11 and a second end of the sixth capacitor C6 are both grounded.

Specifically, the first group of switches receives the first electrical signal, the eighth switch Q8 and the ninth switch Q9 are turned on, the first group of switches does not receive the first electrical signal, and the eighth switch Q8 and the ninth switch Q9 are turned off. The second group of switches receives the second electric signal, the tenth switch Q10 and the eleventh switch Q11 are turned on, the second group of switches does not receive the second electric signal, and the tenth switch Q10 and the eleventh switch Q11 are turned off. For example, if the first group of switches receives the first electrical signal and the second group of switches does not receive the second electrical signal, the power is charged to the first capacitor C1 through the eighth switch Q8 and the ninth switch Q9, and the voltage-reducing module 120 is in a charging state. Meanwhile, the electric energy is filtered and output through the inductor L and the sixth capacitor C6, so that the voltage dropping module 120 can stably output an electric signal of the voltage V2. If the first group of switches 121 does not receive the first electrical signal, and the second group of switches receives the second electrical signal, the electrical energy stored in the first capacitor C1 is discharged to the inductor L through the tenth switch Q10 and the eleventh switch Q11, and filtered by the inductor L and the sixth capacitor C6, the electrical signal of the voltage Vout provided to the charge pump module 130 can be stabilized, and the voltage-dropping module 120 is in a discharging state.

Optionally, fig. 4 is the equivalent circuit diagram of the voltage reduction module in the first state, fig. 5 is provided in the embodiment of the present invention, fig. 6 is the equivalent circuit diagram of the voltage reduction module in the second state, fig. 7 is the equivalent circuit diagram of the voltage reduction module in the fifth state, provided in the embodiment of the present invention, is the equivalent circuit diagram of the voltage reduction module in the sixth state. With reference to fig. 4 to 7, the buck module 120 is in the first state or the second state, and the switching node voltage Vsw and the input voltage Vin of the buck module satisfy Vsw ═ Vin/2; if the buck module 120 is in the fifth state, the eighth switch Q8 and the tenth switch Q10 are turned on, the ninth switch Q9 and the eleventh switch Q11 are turned off, and the switching node voltage Vsw and the input voltage Vin of the buck module 120 satisfy Vsw ═ Vin; if the buck module 120 is in the sixth state, the eighth switch Q8 and the tenth switch Q10 are turned off, the ninth switch Q9 and the eleventh switch Q11 are turned on, and the switching node voltage Vsw of the buck module 120 satisfies Vsw equal to 0.

Specifically, if the input voltage Vin and the output voltage Vout of the voltage-reducing module 120 satisfy Vin >2Vout, the working principle of the voltage-reducing module 120 is as follows:

in the first stage, the voltage-reducing module 120 is in the first state, as shown in fig. 4, the eighth switch Q8 and the ninth switch Q9 are turned on, the tenth switch Q10 and the eleventh switch Q11 are turned off, the equivalent resistance of the eighth switch Q8 is R8, the equivalent resistance of the ninth switch Q9 is R9, the switch node voltage Vsw is Vin/2, the first capacitor C1 starts to charge, and the inductor L also starts to conduct current. In the second stage, the voltage-reducing module 120 is in the sixth state, as shown in fig. 7, the ninth switch Q9 and the eleventh switch Q11 are turned on, the eighth switch Q8 and the tenth switch Q10 are turned off, the equivalent resistance of the eleventh switch Q11 is R11, the switch node voltage Vsw is grounded, Vsw is 0, and the inductor L stops being energized. In the third stage, the voltage-reducing module 120 is in the second state, as shown in fig. 5, the tenth switch Q10 and the eleventh switch Q11 are turned on, the equivalent resistance of the tenth switch Q10 is R10, the eighth switch Q8 and the ninth switch Q9 are turned off, the first capacitor C1 starts to discharge, the switch node voltage Vsw is Vin/2, and the inductor L continues to be energized again. In the fourth phase, the voltage decreasing module 120 returns to the sixth state, as shown in fig. 7. As the input voltage Vin decreases, the duration of the first and third phases is automatically extended, i.e., the duty cycle is increased, thereby providing a stable output voltage. Therefore, if the input voltage Vin and the output voltage Vout of the buck module 120 satisfy Vin >2Vout, the switch node voltage Vsw alternates between 0 and Vin/2, and the output voltage 0< Vout < Vin/2 of the buck module 120 is shown in fig. 8.

If the input voltage Vin and the output voltage Vout of the buck module 120 satisfy Vin <2Vout, as the input voltage Vin continuously decreases, the duty ratio is continuously increased until the eighth switch Q8 and the tenth switch Q10 are turned on, and the operating principle of the buck module 120 is as follows:

in the first phase, the voltage-reducing module 120 is in the fifth state, as shown in fig. 6, the eighth switch Q8 and the tenth switch Q10 are turned on, the ninth switch Q9 and the eleventh switch Q11 are turned off, the switch node voltage Vsw is Vin, and the inductor L is powered on. In the second stage, the voltage-reducing module 120 is in the first state, as shown in fig. 4, the switch node voltage Vsw is Vin/2, the first capacitor C1 starts to charge, and the inductor L is energized. In the third stage, the voltage-reducing module 120 returns to the fifth state, as shown in fig. 6, the switch node voltage Vsw is Vin, and the inductor L is powered on. In the fourth stage, as shown in fig. 5, the voltage-reducing module 120 is in the second state, the first capacitor C1 is discharged, the switch node voltage Vsw is Vin/2, and the inductor L is energized. As the input voltage Vin decreases, the duration of the first and third phases is automatically extended, i.e., the duty cycle is increased, thereby providing a stable output voltage. Therefore, if the input voltage Vin and the output voltage Vout of the buck module 120 satisfy Vin <2Vout, the switch node voltage Vsw alternates between Vin/2 and Vin, and the output voltage Vin/2< Vout < Vin of the buck module 120, as shown in fig. 9.

In summary, the switch node voltage Vsw of the voltage-reducing module 120 has three states: 0. vin/2 and Vin, when Vin >2Vout, the switch node voltage Vsw alternates between 0 and Vin/2; when Vin <2Vout, the switch node voltage Vsw alternates between Vin/2 and Vin. The voltage reduction module 120 reduces the voltage on the inductor L and the switching node in all stages, and at the same time, the switching frequency at the switching node is doubled, so that the maximum inductor current ripple can be reduced by 1/4 times, the switching loss is reduced, and therefore, the charging efficiency can be improved to 96%.

Optionally, with continued reference to fig. 1, the wireless charging circuit 100 further includes a rectification module 150. The input end of the rectifying module 150 is electrically connected to the output end of the power receiving module 110, the output end of the rectifying module 150 is electrically connected to the input end of the voltage reducing module 120, and the rectifying module 150 is configured to convert an ac signal output by the power receiving module 110 into a dc signal.

Specifically, the wireless signal transmitted by the power transmitting module may be a dc signal or an ac signal, but the battery 310 to be charged can only receive a dc signal. When the wireless signal is an ac signal, the power receiving module 110 generates an ac signal after receiving the wireless signal, and therefore, the rectifying module 150 needs to be disposed to convert the ac signal generated by the power receiving module 110 into a dc signal, so as to ensure smooth charging. The rectifier module 150 may be a rectifier bridge, such as a half-wave rectifier bridge, a full-wave rectifier bridge, or a bridge rectifier bridge.

Based on same kind conceive, the embodiment of the utility model provides a still provide an electronic equipment, include the utility model discloses the wireless charging circuit that arbitrary embodiment provided possesses its corresponding function and beneficial effect.

Fig. 10 is a schematic structural diagram of a wireless charging system according to an embodiment of the present invention, as shown in fig. 10, the wireless charging system 200 includes a wireless adapter 210 and a wireless charging circuit 100, the wireless adapter 210 includes an electric energy emitting module 211, the electric energy emitting module 211 is coupled with the wireless charging circuit 100, and a battery to be charged is electrically connected to the wireless charging circuit 100.

Specifically, as shown in fig. 10, after receiving the wireless signal sent by the power transmitting module 211, the wireless charging circuit 100 generates a dc signal matched with the battery to be charged, and provides the dc signal to the battery to be charged, so that the wireless charging system 200 implements the wireless charging function.

Based on same kind conceive, the embodiment of the utility model provides a wireless charging system who still provides, include the utility model discloses the wireless charging circuit that arbitrary embodiment provided possesses its corresponding function and beneficial effect.

Fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 11, the electronic device 300 includes: the charging device comprises a battery 310 to be charged and a wireless charging circuit 100, wherein the wireless charging circuit 100 is electrically connected with the battery 310 to be charged.

Specifically, as shown in fig. 11, the electronic device 300 includes a device main body 320, a battery 310 to be charged disposed in the device main body 320, a dc signal generated by the wireless charging circuit 100 is provided to the battery 310 to be charged, and the electronic device 300 implements a wireless charging function.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A wireless charging circuit, comprising: the device comprises an electric energy receiving module, a voltage reduction module and a charge pump module;

the electric energy receiving module is coupled with the electric energy transmitting module and is used for receiving the wireless signals transmitted by the electric energy transmitting module and generating electric signals; the input end of the voltage reduction module is electrically connected with the electric energy receiving module, the voltage reduction module is used for reducing the voltage of the electric signal to a target voltage value, the input end of the charge pump module is electrically connected with the output end of the voltage reduction module, the output end of the charge pump module is electrically connected with a battery to be charged, and the charge pump module is used for reducing the voltage of the electric signal of the target voltage value and outputting the electric signal to the battery to be charged;

the voltage reduction module comprises a first group of switches, a second group of switches and a first capacitor; if the voltage reduction module is in a first state, the first group of switches are turned on, the second group of switches are turned off, and the electric energy receiving module charges the first capacitor and the charge pump module; if the voltage reduction module is in a second state, the first group of switches is switched off, the second group of switches is switched on, and the first capacitor charges the charge pump module;

the charge pump module comprises a second capacitor, a third capacitor and a fourth capacitor, the battery to be charged is electrically connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is grounded; if the charge pump module is in a third state, the second capacitor, the third capacitor and the fourth capacitor are connected in series; and if the charge pump module is in a fourth state, the second capacitor, the third capacitor and the fourth capacitor are connected in parallel.

2. The wireless charging circuit of claim 1, wherein the charge pump module further comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch;

the first end of the first switch is electrically connected with the output end of the voltage reduction module, the second end of the first switch is electrically connected with the first end of the second switch and the first end of the second capacitor, the second end of the second capacitor is electrically connected with the first end of the third switch and the first end of the fourth switch, the second end of the third switch is electrically connected with the first end of the third capacitor and the first end of the fifth switch, the second end of the third capacitor is electrically connected with the first end of the sixth switch and the first end of the seventh switch, the second end of the seventh switch is electrically connected with the first end of the fourth capacitor, the second end of the second switch and the second end of the fifth switch, and the second end of the fourth switch and the second end of the sixth switch are both grounded.

3. The wireless charging circuit of claim 2, further comprising a control module;

the first end of the control module is respectively and electrically connected with the control end of the first switch, the control end of the third switch and the control end of the seventh switch; and the second end of the control module is respectively and electrically connected with the control end of the second switch, the control end of the fourth switch, the control end of the fifth switch and the control end of the sixth switch.

4. The wireless charging circuit of claim 2, wherein if the charge pump module is in the third state, the first switch, the third switch and the seventh switch are turned on, and the second switch, the fourth switch, the fifth switch and the sixth switch are turned off;

if the charge pump module is in the fourth state, the second switch, the fourth switch, the fifth switch and the sixth switch are turned on, and the first switch, the third switch and the seventh switch are turned off.

5. The wireless charging circuit of claim 2, wherein the charge pump module further comprises a fifth capacitor;

the first end of the fifth capacitor is electrically connected with the first end of the first switch, and the second end of the fifth capacitor is grounded.

6. The wireless charging circuit of claim 1, wherein the first set of switches comprises an eighth switch and a ninth switch, the second set of switches comprises a tenth switch and an eleventh switch, and the voltage dropping module further comprises an inductor and a sixth capacitor;

a first end of the eighth switch is electrically connected with the power receiving module, and a second end of the eighth switch is electrically connected with a first end of the first capacitor and a first end of the tenth switch respectively; a second end of the tenth switch is electrically connected to a first end of the ninth switch and the inductor, respectively, and a second end of the ninth switch is electrically connected to a second end of the first capacitor and a first end of the eleventh switch, respectively; the second end of the inductor is electrically connected with the first end of the sixth capacitor and the input end of the charge pump module respectively, and the second end of the eleventh switch and the second end of the sixth capacitor are both grounded.

7. The wireless charging circuit of claim 6, wherein if the buck module is in the first state or the second state, the switch node voltage Vsw and the input voltage Vin of the buck module satisfy Vsw-Vin/2; if the buck module is in a fifth state, the eighth switch and the tenth switch are turned on, the ninth switch and the eleventh switch are turned off, and the switch node voltage Vsw and the input voltage Vin of the buck module meet Vsw-Vin; if the buck module is in the sixth state, the eighth switch and the tenth switch are turned off, the ninth switch and the eleventh switch are turned on, and the switch node voltage Vsw of the buck module satisfies Vsw-0.

8. The wireless charging circuit according to any one of claims 1 to 7, further comprising a rectifying module;

the input end of the rectifying module is electrically connected with the output end of the electric energy receiving module, and the output end of the rectifying module is electrically connected with the input end of the voltage reducing module; the rectifying module is used for converting the alternating current signal output by the electric energy receiving module into a direct current signal.

9. A wireless charging system comprising a wireless adapter and the wireless charging circuit of any of claims 1-7;

the wireless adapter comprises an electric energy transmitting module, the electric energy transmitting module is coupled with the wireless charging circuit, and the battery to be charged is electrically connected with the wireless charging circuit.

10. An electronic device comprising a battery to be charged and the wireless charging circuit of any one of claims 1-7;

the wireless charging circuit is electrically connected with the battery to be charged.

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