CN211018328U

CN211018328U - Wireless charger

Info

Publication number: CN211018328U
Application number: CN201922123173.3U
Authority: CN
Inventors: 刘维
Original assignee: Shenzhen Xunchiyuan Electronic Co ltd
Current assignee: Shenzhen Xunchiyuan Electronic Co ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-07-14
Anticipated expiration: 2029-12-02

Abstract

The utility model discloses a wireless charger includes the shell, sets up the charging circuit in the shell and passes the shell and the power input end that charging circuit connects, the charging circuit includes drive circuit, charging coil, demodulation circuit and the control unit; the power input end is respectively connected with the driving circuit and the control unit, and the demodulation circuit is connected between the driving circuit and the control unit. The utility model discloses a wireless charger includes four parts of the control unit, drive circuit, demodulation circuit and transmitting coil, simple structure, and production is convenient, can effectually detect the foreign matter of placing the transmitting coil play when low in production cost, avoids wireless charger idle running.

Description

Wireless charger

Technical Field

The utility model relates to a wireless charging technology field, concretely relates to wireless charger.

Background

Since the wireless charging technology enters the lives of people, the wireless charging technology is always well received by users due to the convenience of use. The wireless charging is mainly completed by utilizing an electromagnetic induction principle, electronic equipment such as a mobile phone and the like supporting wireless charging is required to be placed on a charging surface of a wireless charger when the existing wireless charger is charged, the wireless charger detects a wireless receiving ring in the electronic equipment, and the wireless charging ring and the wireless receiving ring of the wireless charger can be charged after being matched with each other. However, as the technology is still immature, some sundries can be successfully matched with the charging coil of the wireless charger, so that the wireless charger starts to be placed without a receiving end, and safety accidents occur while the wireless charger is damaged easily. In addition, the existing wireless charging has the conditions that the charger is complex in structure, difficult to produce, low in electric quantity conversion rate, easy to overheat and the like.

Disclosure of Invention

To the complicated problem of wireless charger structure among the above-mentioned prior art, the utility model provides a simple structure, wireless charger safe in utilization can carry out wireless charging for mobile devices such as smart mobile phone, bluetooth speaker, can regard as the wireless function extension accessory that charges of furniture in places such as office, meeting room, airport, coffee room, dining room, store house to use moreover.

The utility model provides a technical scheme that its technical problem adopted is: a wireless charger comprises a shell, a charging circuit arranged in the shell and a power input end penetrating through the shell and connected with the charging circuit, wherein the charging circuit comprises a driving circuit, a charging coil, a demodulation circuit and a control unit; the power supply input end is respectively connected with the driving circuit and the control unit, and the demodulation circuit is connected between the driving circuit and the control unit; the drive circuit comprises a P-channel enhanced field effect transistor and an N-channel enhanced field effect transistor, wherein a source electrode and a grid electrode of the P-channel enhanced field effect transistor are connected with the power input end, a drain electrode of the P-channel enhanced field effect transistor is connected with the charging coil, a source electrode of the N-channel enhanced field effect transistor is grounded, a drain electrode end of the N-channel enhanced field effect transistor is connected with the charging coil, a grid electrode of the N-channel enhanced field effect transistor is connected with the control unit, and the control unit sends a PWM signal to control the opening and closing of the N-channel enhanced field effect transistor.

The utility model provides a technical scheme that its technical problem adopted further still includes:

the demodulation circuit comprises a blocking capacitor C21, a low-pass filtering unit and an operational amplifier U2, the blocking capacitor C21 is connected with the low-pass filtering unit in series, the low-pass filtering unit comprises a resistor R9 and a capacitor C20, one end of the resistor R9 is connected with the blocking capacitor C21, the other end of the resistor R9 is connected with the operational amplifier U2, one end of the capacitor C20 is connected between the resistor R9 and the operational amplifier U2, and the other end of the capacitor C20 is grounded.

The operational amplifier U2 adopts a L M358 type double operational amplifier, the non-inverting input end of a first operational amplifier channel of the operational amplifier is connected with a driving circuit, the inverting input end of the first operational amplifier channel is grounded, the output end of the first operational amplifier channel is respectively connected with the non-inverting input end and the inverting input end of a second operational amplifier channel, a resistor R8 is arranged between the output end of the first operational amplifier channel and the non-inverting input end of the second operational amplifier channel, one end of the resistor R8 is connected with the output end of the first operational amplifier channel, the other end of the resistor R8 is respectively connected with the non-inverting input end and a resistor R15 of the second operational amplifier channel, the other end of the resistor R15 is connected with the output end of the second operational amplifier channel, a resistor R4 is arranged between the output end of the first operational amplifier channel and the inverting input end of the second operational amplifier channel, one end of the resistor R365 is connected with the output end of the first operational amplifier channel, the other end of the resistor R12 is respectively connected with the inverting input end of the second operational amplifier channel and a capacitor C13, the other end of the capacitor C13 is grounded, and the output.

The power input end adopts a miniUSB interface with the power supply voltage of 4.8V-5.2V and the current of 2A.

Be equipped with one-way conduction isolation between charging coil and the demodulation circuit charging coil and demodulation circuit diode D1, diode D1's input with the charging coil is connected, diode D1's output and demodulation circuit are connected.

The diode adopts a 1N4148 small high-speed switch diode.

Be connected with the sampling circuit between the control unit and the drive circuit, the one end of sampling circuit is connected the output of diode is connected, the other end of sampling circuit is connected on the voltage current sampling port of control unit.

The control unit adopts a CHZ-A0522A-9100Z type controller, the control unit is provided with a power input port, a voltage and current sampling port and a PWM port, and the PWM port is connected with the grid electrode of the N-channel enhancement type field effect transistor.

The control unit is provided with two indicator light ports and is connected with the power input end, L ED indicator lights are respectively arranged on a connecting line connected with the power input end, and the L ED indicator lights are controlled by the controller.

The beneficial effects of the utility model are that, the utility model discloses a wireless charger includes the control unit, drive circuit, four parts of demodulation circuit and charging coil, moreover, the steam generator is simple in structure, and is convenient for production, can effectually detect the foreign matter of placing the charging coil play when low in production cost, avoid wireless charger idle running, the control unit can implement the behavior of control drive circuit and charging coil, and rapid electric current and the voltage that passes through charging coil and drive circuit according to received current-voltage condition control, can make certain adjustment to the output of charging coil according to the electronic equipment's of receiving electric power condition on the one hand, on the other hand also can avoid charging coil and drive circuit to appear in service overheat, condition such as excessive pressure, ensure safe in utilization, and the control unit still is equipped with L ED pilot lamp, the person of facilitating the use judges the in wireless charger's in service behavior at any time.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a circuit block diagram of a preferred embodiment of the wireless charger of the present invention;

FIG. 2 is a schematic circuit diagram of a preferred embodiment of the wireless charger of the present invention;

fig. 3 is a schematic circuit diagram of a driving circuit and a charging coil in a preferred embodiment of the wireless charger of the present invention;

fig. 4 is a schematic circuit diagram of a demodulation circuit in a preferred embodiment of the wireless charger of the present invention.

Detailed Description

The embodiment is a preferred embodiment of the present invention, and other principles and basic structures are the same as or similar to those of the embodiment, and are within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model discloses a wireless charger is shown with reference to fig. 1-4, including the shell, set up the charging circuit in the shell inside to and pass the power input end that shell and charging circuit are connected. In order to be used safely, the casing is made of fireproof and insulating materials, in addition, in order to be used conveniently, the shape that the charging circuit of the wireless charger can be completely covered inside can be made according to the use scene, and the casing of the wireless charger is omitted in the attached drawings in order to clearly show the structure of the charging circuit. In this embodiment, the miniUSB interface with specification 5V2A is used as the power input terminal, and in practical use, power interfaces with different specifications can be used according to the use conditions, since the rated voltage of the charging circuit in this embodiment is 5V, if a power supply with other voltage is used, a circuit for reducing voltage needs to be added to the charging circuit.

The charging circuit in this embodiment is shown in fig. 2, and includes four parts, which are a driving circuit, a charging coil, a demodulation circuit, and a control unit; the power input end penetrates through the shell and then is connected with the control unit and the driving circuit respectively, the charging coil is connected in the driving circuit in series, and the demodulation circuit is connected between the driving circuit and the control unit.

The driving circuit and the charging coil of the embodiment are shown in fig. 3, the driving circuit comprises two P-channel enhanced field effect transistors Q3 and Q4, the sources of the P-channel enhanced field effect transistors Q3 and Q4 are respectively connected with a power supply input end, the drain of the P-channel enhanced field effect transistor Q3 is connected with a charging coil L, the drain of the P-channel enhanced field effect transistor Q4 is connected with a capacitor bank, the capacitor bank comprises four capacitors C16, C17, C18 and C19, the driving circuit comprises two N-channel enhanced field effect transistors Q1 and Q2, the sources of the N-channel enhanced field effect transistors Q1 and Q2 are grounded, the grid is connected with a control unit, the drain of the N-channel enhanced field effect transistor Q1 is connected between the drain of the P-channel enhanced field effect transistor Q3 and the charging coil L, the drain of the N-channel enhanced field effect transistor Q2 is connected with the capacitor bank, the control unit sends a PWM signal to the gate to control the opening and closing of the charging coil 861 of the N-channel enhanced field effect transistor Q L, the other end of the charging coil 861 is connected with the charging coil 867, the charging coil is connected with a small-diode 1, the charging coil is easily recovered by a high-speed diode switch circuit, the reverse voltage of the charging coil 1, the charging coil is easily recovered by a small-adjustable diode 1, the high-speed diode is easily, the high-speed-adjustable diode is easily-adjustable diode, the high-speed-adjustable.

Referring to fig. 4, the demodulation circuit of this embodiment includes a dc blocking capacitor C21, a low pass filter unit and an operational amplifier U2., the dc blocking capacitor C21 isolates dc power passing through a charging coil L, and only allows ac power to flow to the operational amplifier, in this embodiment, a dc blocking capacitor C21 adopts a capacitor with a capacitance of 4.7nF, the low pass filter unit is connected in series with the dc blocking capacitor C21, the low pass filter unit includes a resistor R9 and a capacitor C20, and is capable of filtering out high-frequency signals above 175kHz, one end of the resistor R9 is connected with the dc blocking capacitor C21, the other end of the resistor R9 is connected with an operational amplifier U2, one end of the capacitor C20 is connected between the resistor R20 and the operational amplifier U20, and the other end of the capacitor C20 is grounded, in this embodiment, the operational amplifier U20 adopts a 20M 358-type dual operational amplifier, a non-inverting input terminal 3 of a first operational amplifier channel of the operational amplifier U20 is connected with a driving circuit, an input terminal 2 of the first operational amplifier channel is grounded, an output terminal of the first operational amplifier U20 is connected with an inverting amplifier channel, an inverting input terminal of the second operational amplifier R5 is connected with an inverting input terminal of the second operational amplifier R366, and an inverting input terminal of the second operational amplifier channel, and an inverting resistor R366 of the second operational amplifier 366, and an inverting amplifier 366 are connected with an inverting input terminal of the second operational amplifier channel, and an inverting control resistor R366, and an inverting input terminal of the second input terminal of the operational amplifier 366, and an inverting amplifier 20, and an inverting control resistor R366, and an inverting input terminal of the second input terminal of the operational amplifier 20, the operational amplifier channel of the second operational amplifier 366 are.

The control unit of the embodiment is shown in fig. 1, a CHZ-a0522A-9100Z controller is adopted, the controller has eight ports in total, the controller comprises

controller comparison terminals

1 and 8,

power input terminals

2 and 3, a signal receiving port 4, a voltage and current sampling port 6 and

PWM ports

5 and 7, L ED indicator lamps with red and blue colors are respectively arranged between the

power input terminals

2 and 3 and the power input terminals, and can accurately display the working condition of the wireless charger under the control of the controller, the

controller comparison terminals

1 and 8 are used as comparison references for receiving the current and voltage conditions after passing through a driving circuit and a charging coil under the control of the controller, the signal receiving port 4 receives coded information decoded by a demodulation circuit, so that the controller can control the current condition in the unit according to the coded information, the voltage and current sampling port 6 is connected with a diode D1, the power voltage after passing through the charging coil and the driving circuit is detected, a resistor R19 is arranged on a sampling line of a diode D1, a capacitor C10 and a resistor R20 which are grounded at one end are connected, so that signals above a kHz are filtered out, the signal is used for filtering the signal, the signal output by a high-frequency signal output by a charging coil, the charging circuit, the charging lamp is connected with a wireless charger, the charging channel, the.

When the electronic device is placed on the charging surface of the wireless charger and successfully matched with the charging coil L, the control unit controls the N-channel enhanced effect tube Q1 and the Q2 to be connected, so that most of current in the charging circuit flows to the ground end, the whole charging circuit is prevented from being damaged in low-power standby, the demodulation circuit decodes the signal received by the charging coil and obtains coded information, and the coded information is transmitted to the controller of the control unit, and simultaneously the controller monitors the current and voltage change of the circuit, judges that the charging coil is in a working state according to the coded information and the change condition, controls the opening and closing of the N-channel enhanced effect tube Q1 and the Q2 to adjust the current and voltage of the charging coil through the driving circuit and the charging coil, judges that the current and the voltage of the charging coil 1 are reduced again, and controls the charging coil to control the charging device to control the charging current and the charging coil 3526 to control the charging device to be normally charged.

The utility model discloses a wireless charger includes the control unit, drive circuit, four parts of demodulation circuit and charging coil, moreover, the steam generator is simple in structure, the production is convenient, can effectually detect the foreign matter of placing the charging coil play in the time of low in production cost, avoid the charger idle running, the control unit can implement the behavior of control drive circuit and charging coil, and rapid electric current and the voltage through charging coil and drive circuit according to received current-voltage condition control, can make certain adjustment to the output of charging coil according to the condition of the electronic equipment of receiving electric power on the one hand, on the other hand also can avoid charging coil and drive circuit to appear in service overheat, circumstances such as excessive pressure, ensure safe in utilization, and the control unit still is equipped with L ED pilot lamp, the person of facilitating the use judges the in service behavior of wireless charger at any time.

Claims

1. A wireless charger comprises a shell, a charging circuit arranged in the shell and a power input end penetrating through the shell and connected with the charging circuit, and is characterized in that the charging circuit comprises a driving circuit, a charging coil, a demodulation circuit and a control unit; the power supply input end is respectively connected with the driving circuit and the control unit, and the demodulation circuit is connected between the driving circuit and the control unit; the drive circuit comprises a P-channel enhanced field effect transistor and an N-channel enhanced field effect transistor, wherein a source electrode and a grid electrode of the P-channel enhanced field effect transistor are connected with the power input end, a drain electrode of the P-channel enhanced field effect transistor is connected with the charging coil, a source electrode of the N-channel enhanced field effect transistor is grounded, a drain electrode of the N-channel enhanced field effect transistor is connected with the charging coil, a grid electrode of the N-channel enhanced field effect transistor is connected with the control unit, and the control unit sends a PWM signal to control the opening and closing of the N-channel enhanced field effect transistor.

2. The wireless charger according to claim 1, wherein the demodulation circuit comprises a dc blocking capacitor C21, a low pass filter unit and an operational amplifier U2, the dc blocking capacitor C21 is connected in series with the low pass filter unit, the low pass filter unit comprises a resistor R9 and a capacitor C20, one end of the resistor R9 is connected to the dc blocking capacitor C21, the other end of the resistor R9 is connected to the operational amplifier U2, one end of the capacitor C20 is connected between the resistor R9 and the operational amplifier U2, and the other end of the capacitor C20 is grounded.

3. The wireless charger of claim 2, wherein the operational amplifier U2 is a L M358 type dual operational amplifier, the non-inverting input terminal of a first operational amplifier channel of the operational amplifier is connected to the driving circuit, the inverting input terminal of the first operational amplifier channel is grounded, the output terminal of the first operational amplifier channel is connected to the non-inverting input terminal and the inverting input terminal of a second operational amplifier channel, a resistor R8 is disposed between the output terminal of the first operational amplifier channel and the non-inverting input terminal of the second operational amplifier channel, one end of the resistor R8 is connected to the output terminal of the first operational amplifier channel, the other end of the resistor R8 is connected to the non-inverting input terminal of the second operational amplifier channel and a resistor R15, the other end of the resistor R15 is connected to the output terminal of the second operational amplifier channel, a resistor R4 is disposed between the output terminal of the first operational amplifier channel and the inverting input terminal of the second operational amplifier channel, one end of the resistor R12 is connected to the output terminal of the first operational amplifier channel, the other end of the resistor R12 is connected to the output terminal of the second operational amplifier channel and the inverting input terminal of the capacitor 13, and the capacitor C13 are connected to the second operational amplifier channel.

4. The wireless charger of claim 1, wherein the power input terminal is a miniUSB interface with a supply voltage of 4.8V to 5.2V and a current of 2A.

5. The wireless charger according to claim 1, wherein a diode D1 for unidirectional conduction and isolation is provided between the charging coil and the demodulation circuit, the input end of the diode D1 is connected with the charging coil, and the output end of the diode D1 is connected with the demodulation circuit.

6. The wireless charger of claim 5 wherein said diode is a 1N4148 miniature high speed switching diode.

7. The wireless charger according to claim 5, wherein a sampling line is connected between the control unit and the driving circuit, one end of the sampling line is connected to the output end of the diode, and the other end of the sampling line is connected to a voltage and current sampling port of the control unit.

8. The wireless charger of claim 1, wherein the control unit is a CHZ-a0522A-9100Z controller, and the control unit is provided with a power input port, a voltage and current sampling port and a PWM port, and the PWM port is connected to the gate of the N-channel enhancement mode fet.

9. The wireless charger according to claim 8, wherein the control unit is provided with two indicator light ports connected to the power input terminal, and connecting lines connected to the power input terminal are respectively provided with L ED indicator lights, and the L ED indicator lights are controlled by the controller.