CN219322153U - Wireless charging circuit - Google Patents

Abstract

The embodiment of the utility model discloses a wireless charging circuit, which comprises a main control unit, an LC resonance unit and a coil adapting unit, wherein the main control unit is used for modulating PWM waveforms and outputting PWM waveforms; the LC resonance unit is used for outputting the required energy of the charged equipment according to the PWM waveform; the coil adapting unit is used for adapting the resonance coil Lx in the LC resonance unit. By implementing the circuit provided by the embodiment of the utility model, the coil emission loss can be reduced, and the overall charging efficiency is improved.

Description

Wireless charging circuit

Technical Field

The utility model relates to the technical field of charging circuits, in particular to a wireless charging circuit.

Background

The wireless charging seat is a device for charging by utilizing the electromagnetic induction principle, and the principle is similar to that of a transformer, and the coil at the transmitting end and the coil at the receiving end are respectively arranged, so that the coil at the transmitting end transmits electromagnetic signals to the outside under the action of power, and the coil at the receiving end receives the electromagnetic signals and converts the electromagnetic signals into current, thereby achieving the purpose of wireless charging. The wireless charging technology is a special power supply mode, does not need a power line, relies on electromagnetic wave propagation, then converts electromagnetic wave energy into electric energy, and finally realizes wireless charging.

In the circuit of the existing wireless charging seat, the coil has larger emission loss and low overall charging efficiency.

Therefore, it is necessary to design a new circuit to reduce the coil emission loss and improve the overall charging efficiency.

Disclosure of Invention

The utility model aims to provide a wireless charging circuit.

In order to solve the technical problems, the aim of the utility model is realized by the following technical scheme: providing a wireless charging circuit comprising: the device comprises a main control unit, an LC resonance unit and a coil adapting unit, wherein the main control unit is used for modulating PWM waveforms and outputting PWM waveforms; the LC resonance unit is used for outputting the required energy of the charged equipment according to the PWM waveform; the coil adapting unit is used for adapting the resonance coil Lx in the LC resonance unit.

The further technical scheme is as follows: the main control unit comprises a main control chip U1.

The further technical scheme is as follows: the LC resonance unit comprises a resonance coil Lx and a resonance capacitor C2, wherein the resonance coil Lx is connected with the main control unit, and the resonance capacitor C2 is connected with the resonance coil Lx in parallel.

The further technical scheme is as follows: the coil adapting unit comprises an adapting capacitor C5, and the adapting capacitor C5 is connected with the resonance coil Lx in parallel.

The further technical scheme is as follows: the device also comprises a filtering unit, wherein the filtering unit is respectively connected with the power supply unit and the main control unit.

The further technical scheme is as follows: the filtering unit comprises a filtering capacitor C1, and the filtering capacitor C1 is connected with the main control unit; the filter capacitor C1 is connected in parallel with the filter capacitor C4.

The further technical scheme is as follows: and a fuse F1 is connected between the filter capacitor C1 and the power supply unit.

The further technical scheme is as follows: the filter capacitor C1 is connected with a TVS tube D1 in parallel.

The further technical scheme is as follows: the main control chip U1 is provided with an OCP terminal pin; the OCP terminal pin is connected with a resistor R1 with one end grounded.

The further technical scheme is as follows: the capacitor C3 is connected in parallel with the two ends of the resistor R1.

Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the coil adapting units are connected in parallel with the two ends of the resonant coil Lx of the LC resonance unit, and the coil adapting units adapt to the resonant coil Lx, so that the coil emission loss is reduced, and the overall charging efficiency is improved.

The utility model is further described below with reference to the drawings and specific embodiments.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic block diagram of a wireless charging circuit provided by an embodiment of the present utility model;

fig. 2 is a schematic circuit diagram of a wireless charging circuit according to an embodiment of the present utility model;

FIG. 3 is a specific block diagram of an MC8044 chip provided by an embodiment of the present utility model;

the figure identifies the description:

10. a main control unit; 20. an LC resonance unit; 30. a coil adapting unit; 40. a filtering unit; 50. and a power supply unit.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 1, fig. 1 is a schematic block diagram of a wireless charging circuit according to an embodiment of the present utility model, which can be applied in a scenario of charging by using a coil, such as a wireless charging base, to reduce the emission loss of the coil and improve the overall charging efficiency.

Referring to fig. 1, the wireless charging circuit includes: the device comprises a main control unit 10, an LC resonance unit 20 and a coil adapting unit 30, wherein the main control unit 10 is used for modulating PWM waveforms and outputting PWM waveforms; an LC resonance unit 20 for outputting required energy of the charged device according to the PWM waveform; a coil adapting unit 30 for adapting the resonance coil Lx in the LC resonance unit 20.

In this embodiment, adding the coil adapting unit 30 means adding one more capacitor C5 when the circuit board is layout, so as to better adapt to the resonant coil Lx, and reduce emission loss and improve charging efficiency.

In this embodiment, the whole wireless charging circuit is integrated on the PCB board, and the whole PCB board is surrounded by GND to reduce radiation interference.

In an embodiment, referring to fig. 2, the master control unit 10 includes a master control chip U1.

In an embodiment, referring to fig. 2, the LC resonant unit 20 includes a resonant coil Lx and a resonant capacitor C2, the resonant coil Lx is connected with the main control unit 10, and the resonant capacitor C2 is connected in parallel with the resonant coil Lx.

In an embodiment, referring to fig. 2, the coil adapting unit 30 includes an adapting capacitor C5, and the adapting capacitor C5 is connected in parallel with the resonant coil Lx.

In an embodiment, referring to fig. 2, the wireless charging circuit further includes a filtering unit 40, and the filtering unit 40 is connected to the power supply unit 50 and the main control unit 10 respectively.

In an embodiment, referring to fig. 2, the filtering unit 40 includes a filtering capacitor C1, and the filtering capacitor C1 is connected to the main control unit 10; the filter capacitor C1 is connected in parallel with the filter capacitor C4.

In this embodiment, the voltage input is processed by the filter capacitor C1, and in fact, when the input of the V0 version power supply is found to be unstable, an interference is generated, so that a filter capacitor C4 is added, and the patch capacitor is used for filtering the input high-frequency interference, so that the whole machine works more stably.

In an embodiment, referring to fig. 2, a fuse F1 is connected between the filter capacitor C1 and the power supply unit 50. The fuse F1 performs an overcurrent protection function during the voltage input process.

Interface J1 acts as a Type-C interface.

In an embodiment, referring to fig. 2, the filter capacitor C1 is connected in parallel with a TVS tube D1.

In this embodiment, the TVS tube D1 performs an overvoltage protection function during the voltage input process and enhances the electrostatic protection capability.

In an embodiment, referring to fig. 2, the main control chip U1 is provided with an OCP pin; the OCP terminal pin is connected with a resistor R1 with one end grounded.

One end of the resistor R1 is connected with the VSS pin of the main control chip U1 to be grounded and separated from the input ground, so that the accuracy of OCP can be improved; the filter capacitor C1 and the filter capacitor C4 are closely attached to the input pin of the main control chip U1, clutter input can be reduced, interference is small, and the main control chip U1 works more stably; the resonant coil Lx is close to the resonant capacitor and the SW pin, so that loss can be reduced, and radiation interference can be reduced.

In an embodiment, referring to fig. 2, a capacitor C3 is connected in parallel to two ends of the resistor R1.

In this embodiment, the 7 th pin of the main control chip U1 is an OCP terminal pin, that is, an OCP detection input end, and is also a load detection end, so that in order to prevent the battery charging or the load current from exceeding a specified value, the over-current protection circuit converts the current input from the OCPI (7 th pin of the main control chip U1) pin into a corresponding voltage value signal through an internal operational amplifier, and inputs the voltage value signal to the comparator end to be compared with the voltage value output by the internal 8-bit d/a converter, thereby judging whether an over-current condition exists or not. When a load is detected, the NMOS starts to transmit power, and when an overcurrent is detected, the corresponding interrupt is enabled, so that the OCP interrupt is generated.

In this embodiment, the model of the master control chip U1 is, but not limited to, MC8044, and a specific block diagram of the model chip is shown in fig. 3.

In the wireless charging circuit, the coil adapting units 30 are connected in parallel to the two ends of the resonance coil Lx of the LC resonance unit 20, and the coil adapting units 30 adapt to the resonance coil Lx, so that the coil emission loss is reduced, and the overall charging efficiency is improved.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. Wireless charging circuit, its characterized in that includes: the device comprises a main control unit, an LC resonance unit and a coil adapting unit, wherein the main control unit is used for modulating PWM waveforms and outputting PWM waveforms; the LC resonance unit is used for outputting the required energy of the charged equipment according to the PWM waveform; the coil adapting unit is used for adapting the resonance coil Lx in the LC resonance unit.

2. The wireless charging circuit of claim 1, wherein the master control unit comprises a master control chip U1.

3. The wireless charging circuit of claim 1, wherein the LC resonant unit comprises a resonant coil Lx and a resonant capacitor C2, the resonant coil Lx being connected with the main control unit, the resonant capacitor C2 being connected in parallel with the resonant coil Lx.

4. A wireless charging circuit according to claim 3, wherein the coil adaptation unit comprises an adaptation capacitor C5, the adaptation capacitor C5 being connected in parallel with the resonance coil Lx.

5. The wireless charging circuit of claim 1, further comprising a filtering unit connected to the power supply unit and the main control unit, respectively.

6. The wireless charging circuit of claim 5, wherein the filter unit comprises a filter capacitor C1, the filter capacitor C1 being connected to the master control unit; the filter capacitor C1 is connected in parallel with the filter capacitor C4.

7. The wireless charging circuit of claim 6, wherein a fuse F1 is connected between the filter capacitor C1 and the power supply unit.

8. The wireless charging circuit of claim 7, wherein the filter capacitor C1 is connected in parallel with a TVS tube D1.

9. The wireless charging circuit of claim 2, wherein the main control chip U1 is provided with an OCP terminal pin; the OCP terminal pin is connected with a resistor R1 with one end grounded.

10. The wireless charging circuit of claim 9, wherein a capacitor C3 is connected in parallel across the resistor R1.

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