A wireless charging circuit and a wireless charger
By using a PD fast charging power supply and a wireless charging control module for PPS protocol communication in the wireless charging circuit, the buck-boost circuit is omitted, which solves the problems of efficiency loss and high heat generation in wireless charging, and realizes a more efficient and smaller wireless charger design.
Patent Information
- Application Number
- CN202521332171.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-26
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-06-26
AI Technical Summary
In existing wireless charging technologies, buck-boost circuits result in significant efficiency losses, high heat generation, increased material costs, and a large footprint on PCBs.
It adopts a PD fast charging power supply, a wireless charging control module, and a wireless charging output module, and realizes wireless charging through PPS protocol communication, omitting the step-up and step-down circuit and directly outputting the required voltage.
This reduces circuit losses, heat generation, and material costs, and also reduces PCB board space, resulting in a smaller wireless charger.
Smart Images
Figure CN224683896U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wireless charging technology, and in particular to a wireless charging circuit and a wireless charger. Background Technology
[0002] Wireless charging is a technology that powers or charges electronic devices without the need for physical wires. Currently, wireless charging compatible with Apple's MPP protocol requires fixed-frequency voltage regulation, which has better unpacking capabilities than variable-frequency charging. Therefore, the power supply side of the wireless charger needs a buck-boost circuit to power the wireless charging module to achieve fixed-frequency voltage regulation, ensuring the normal operation of the wireless charging module. However, adding a buck-boost circuit can lead to problems such as high conversion efficiency loss in the power supply section, high heat generation, increased material costs, and a larger PCB layout space.
[0003] Therefore, designing a wireless charging circuit and wireless charger with higher performance, fewer materials, and lower cost is of great importance to those skilled in the art. Utility Model Content
[0004] This utility model provides a wireless charging circuit and wireless charger with higher performance, fewer materials, and lower cost, in order to solve the problems of high efficiency loss, high heat generation, increased material costs, and large PCB layout space occupation.
[0005] This utility model discloses a wireless charging circuit, which includes: a PD fast charging power supply, a wireless charging control module, and a wireless charging output module. The power input terminal of the wireless charging control module is connected to the power output terminal of the PD fast charging power supply, and the power output terminal of the wireless charging control module is connected to the wireless charging output module. The wireless charging output module is used to wirelessly charge external devices. The CC terminal of the wireless charging control module is connected to the CC terminal of the PD fast charging power supply for PPS protocol communication with the PD fast charging power supply.
[0006] Optionally, the PD fast charging power supply supports PPS 3.3-21V output.
[0007] Optionally, the wireless charging control module includes a wireless charging control chip, which includes a first CC pin and a second CC pin. The first CC pin and the second CC pin of the wireless charging control chip are connected to the CC pin of the wireless charging output module and the CC pin of the PD fast charging power supply.
[0008] Optionally, the wireless charging control module further includes an input protection unit and an output filtering unit. The input protection unit is located at the power input terminal of the wireless charging control module and is connected to the PD fast charging power supply. The output filtering unit is located at the power output terminal of the wireless charging control module and is connected to the wireless charging output module.
[0009] Optionally, the input protection unit includes a protection diode, the negative terminal of which is connected to the PD fast charging power supply, and the negative terminal of which is connected to the voltage input pin of the wireless charging control chip.
[0010] Optionally, the output filtering unit includes multiple filtering capacitors connected in parallel.
[0011] Optionally, the wireless charging control module further includes a common-mode inductor, one end of which is connected to the input protection unit, and the other end of which is connected to the output filtering unit.
[0012] Optionally, the wireless charging output module is a wireless charging output coil.
[0013] To address the problems existing in the prior art, this utility model also provides a wireless charger, which includes a housing and a circuit board. The circuit board is disposed inside the housing, and the wireless charging circuit described above is arranged on the circuit board.
[0014] Optionally, the housing is provided with a clearance hole, and the wireless charging output module is exposed on the outer surface of the housing and connected to the circuit board wires through the clearance hole.
[0015] The beneficial effects of the wireless charging circuit provided in this embodiment of the present invention are as follows: By designing a wireless charging circuit including a PD fast charging power source, a wireless charging control module, and a wireless charging output module, the power input terminal of the wireless charging control module is connected to the power output terminal of the PD fast charging power source, and the power output terminal of the wireless charging control module is connected to the wireless charging output module. The wireless charging output module is used to wirelessly charge external devices, and the CC terminal of the wireless charging control module is connected to the CC terminal of the PD fast charging power source for PPS protocol communication with the PD fast charging power source. By using PPS protocol communication, the PD fast charging power source can directly output the required voltage. Compared with the existing charging methods, the subsequent step-up / step-down circuit is omitted, which not only effectively reduces circuit loss and product heat generation, but also reduces the material cost and PCB layout space occupied by the step-up / step-down circuit. Attached Figure Description
[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a block diagram of the wireless charging circuit in an embodiment of this utility model; Figure 2 This is a block diagram of a wireless charging circuit in the prior art; Figure 3 This is a circuit diagram of the wireless charging circuit in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the wireless charger in an embodiment of this utility model.
[0017] The labels for the attached figures are as follows: 100, PD fast charging power supply; 200, wireless charging control module; 300, wireless charging output module; 400, buck-boost circuit; 10, housing; 20, circuit board; U2, wireless charging control chip; D1, protection diode. Detailed Implementation
[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0019] like Figure 1 and Figure 3 As shown, this utility model provides a specific embodiment of a wireless charging circuit.
[0020] A wireless charging circuit, reference Figure 1 The wireless charging circuit includes a PD fast charging power supply 100, a wireless charging control module 200, and a wireless charging output module 300. The power input terminal of the wireless charging control module 200 is connected to the power output terminal of the PD fast charging power supply 100, and the power output terminal of the wireless charging control module 200 is connected to the wireless charging output module 300. The wireless charging output module 300 is used to wirelessly charge external devices. The CC terminal of the wireless charging control module 200 is connected to the CC terminal of the PD fast charging power supply 100 for PPS protocol communication with the PD fast charging power supply 100.
[0021] Specifically, the wireless charging circuit adopts the USB PD 3.0+PPS fast charging protocol. The PD fast charging power supply 100 supports PPS3.3-21V output with a step of 20mV, and the current can be adjusted in 50mA steps. The wireless charging output module 300 uses a wireless charging output coil. The CC terminal of the wireless charging control module 200 is connected to the CC terminal of the PD fast charging power supply 100. The CC terminal of the wireless charging control module 200 and the CC terminal of the PD fast charging power supply 100 can be connected through a CC signal line for protocol handshaking. When the wireless charging device is placed on the wireless charging output coil, the wireless charging control module 200 detects the power required by the wireless charging device and requests the required voltage through the PPS protocol. The PD fast charging power supply 100 obtains the required voltage, adjusts the voltage accordingly, and directly outputs the required voltage to the wireless charging control module 200. The wireless charging control module 200 inverts the input required voltage into a high-frequency AC signal and sends it to the wireless charging output coil, thereby realizing fast charging of the wireless charging device through the wireless charging output coil.
[0022] The wireless charging circuit supports 25W charging for Apple iPhones. When an iPhone is placed on the wireless charging output coil, the wireless charging receiving coil on the phone communicates with the wireless charging output coil in the wireless charging circuit via induction, informing the wireless charging control module 200 of the power required by the phone's wireless charging receiving coil. The 25W wireless charging power is generally output by the coil at around 18V / 1.38A. The wireless charging control module 200 directly requests the 18V PSS level voltage output from the PD fast charging power supply 100 through the CC signal line, which is then directly supplied to the wireless charging control module 200. The wireless charging control module 200 inverts the voltage output by the PD fast charging power supply into a high-frequency AC signal and sends it to the wireless charging output coil, thus achieving 25W wireless fast charging.
[0023] Currently, wireless charging compatible with Apple's MPP protocol requires fixed-frequency voltage regulation, which has better unpacking capability than variable-frequency. Under the existing protocol communication method, the wireless charging power supply end needs a set of 400 step-up / step-down circuits to power the wireless charging module to achieve fixed-frequency voltage regulation, so as to ensure the normal operation of the wireless charging module.
[0024] refer to Figure 2The existing control scheme requires a step-up / step-down circuit 400 between the wireless charging control module 200 and the PD fast charging power supply 100 to achieve fixed-frequency voltage regulation. The specific principle is as follows: When the PD fast charging power supply 100 is powered on, it outputs a 5V level to the wireless charging control module 200, which then enters standby mode. When a wireless charging receiver is placed on the wireless charging output coil, the wireless charging control module 200 detects the power required by the wireless charging device, such as 25W for an Apple phone. When the Apple phone is placed on the wireless charging output coil, the phone's wireless charging receiver coil communicates with the output coil via induction, informing the receiver that the device has sufficient power. The wireless charging control module 200 receives the power required by the wireless charging coil. A typical 25W wireless charging output is approximately 18V / 1.38A. The wireless charging control module 200 requests a 15V output from the PD fast charging power supply 100 via the CC signal line, supplying the input to the boost / buck circuit 400. The wireless charging control module 200 controls the boost / buck circuit 400 to boost the input 15V to 18V before outputting it to the wireless charging control module 200. The wireless charging control module 200 then inverts this signal into a corresponding high-frequency AC signal, which is sent to the wireless charging output coil. Finally, the wireless charging output coil enables 25W wireless fast charging.
[0025] Under the existing protocol charging module, the PD fast charging power supply 100 can only output a variety of fixed voltage levels such as 5V, 9V, 12V, 15V, and 20V. It requires a buck-boost circuit 400 to boost or buck the voltage in order to reach the required charging voltage. However, adding a buck-boost circuit 400 will lead to problems such as high conversion efficiency loss in the power supply section, high heat generation, increased material costs, and a large amount of PCB board space occupied.
[0026] In this embodiment, a wireless charging circuit is designed, including a PD fast charging power supply 100, a wireless charging control module 200, and a wireless charging output module 300. The power input terminal of the wireless charging control module 200 is connected to the power output terminal of the PD fast charging power supply 100, and the power output terminal of the wireless charging control module 200 is connected to the wireless charging output module 300. The wireless charging output module 300 is used to wirelessly charge external devices. The CC terminal of the wireless charging control module 200 is connected to the CC terminal of the PD fast charging power supply 100 for PPS protocol communication with the PD fast charging power supply 100. By using PPS protocol communication, the PD fast charging power supply 100 can directly output the required voltage, omitting the subsequent buck-boost circuit 400. This not only effectively reduces circuit loss and product heat generation, but also reduces the material cost and PCB layout space occupied by the buck-boost circuit 400.
[0027] In one embodiment, reference Figure 3The wireless charging control module 200 includes a wireless charging control chip U2, which includes a first CC pin CC1 and a second CC pin CC2. The first CC pin CC1 and the second CC pin CC2 of the wireless charging control chip U2 are connected to the CC terminal of the wireless charging output module 300 and the CC terminal of the PD fast charging power supply 100.
[0028] Among them, the first CC pin CC1 and the second CC pin CC2 of the wireless charging control chip U2 are connected to the CC pin of the wireless charging output module 300 and the CC pin of the PD fast charging power supply 100 for handshaking and requesting the PPS protocol, thereby realizing PPS protocol communication between the wireless charging control chip U2 and the PD fast charging power supply 100.
[0029] In one embodiment, the wireless charging control module 200 further includes an input protection unit and an output filtering unit. The input protection unit is located at the power input terminal of the wireless charging control module 200 and is connected to the PD fast charging power supply 100. The output filtering unit is located at the power output terminal of the wireless charging control module 200 and is connected to the wireless charging output module 300.
[0030] Specifically, refer to Figure 3 The input protection unit includes a protection diode D1. The negative terminal of the protection diode D1 is connected to the PD fast charging power supply 100, and the negative terminal of the protection diode D1 is connected to the voltage input pin of the wireless charging control chip U2. The protection diode D1 can be a TVS diode array for electrostatic discharge protection.
[0031] In one embodiment, reference Figure 3 The output filtering unit includes multiple filter capacitors (C5A, C6, C7, C8), which are connected in parallel. The filter capacitors are key components used to ensure power quality and improve system stability. They can filter out high-frequency switching noise and low-frequency ripple to smooth the output voltage, as well as suppress high-frequency interference and protect the downstream circuits.
[0032] In one embodiment, reference Figure 3 The wireless charging control module 200 also includes a common-mode inductor LF1. One end of the common-mode inductor LF1 is connected to the input protection unit, and the other end of the common-mode inductor is connected to the output filtering unit. The common-mode inductor LF1 is used to suppress common-mode noise and improve the electromagnetic compatibility and stability of the system.
[0033] like Figure 4 As shown, this utility model also provides a specific embodiment of a wireless charger.
[0034] A wireless charger, reference Figure 4The wireless charger includes a housing 10 and a circuit board 20. The circuit board 20 is disposed inside the housing 10 and the aforementioned wireless charging circuit is arranged on the circuit board 20. The housing 10 is provided with a clearance hole. The wireless charging output module 300 is exposed on the outer surface of the housing 10 and is connected to the circuit board 20 by wires through the clearance hole.
[0035] Specifically, the wireless charging circuit includes a PD fast charging power supply 100, a wireless charging control module 200, and a wireless charging output module 300. The power input terminal of the wireless charging control module 200 is connected to the power output terminal of the PD fast charging power supply 100, and the power output terminal of the wireless charging control module 200 is connected to the wireless charging output module 300. The wireless charging output module 300 is used to wirelessly charge external devices. The CC terminal of the wireless charging control module 200 is connected to the CC terminal of the PD fast charging power supply 100 for PPS protocol communication with the PD fast charging power supply 100.
[0036] By designing a wireless charger, the PD fast charging power supply 100 directly outputs the required voltage through PPS protocol communication, eliminating the need for the subsequent step-up / step-down circuit 400. This not only effectively reduces circuit loss and heat generation, but also reduces the material cost and PCB board space occupied by the step-up / step-down circuit 400. This makes the circuit board 20 with the wireless charging circuit more compact, thus making the entire wireless charger more compact, portable, and easier to use.
[0037] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.
Claims
1. A wireless charging circuit, characterized in that, include: The device includes a PD fast charging power supply, a wireless charging control module, and a wireless charging output module. The power input terminal of the wireless charging control module is connected to the power output terminal of the PD fast charging power supply, and the power output terminal of the wireless charging control module is connected to the wireless charging output module. The wireless charging output module is used to wirelessly charge external devices. The CC terminal of the wireless charging control module is connected to the CC terminal of the PD fast charging power supply for PPS protocol communication with the PD fast charging power supply.
2. The wireless charging circuit according to claim 1, characterized in that, The PD fast charging power supply supports PPS 3.3-21V output.
3. The wireless charging circuit according to claim 1, characterized in that, The wireless charging control module includes a wireless charging control chip, which includes a first CC pin and a second CC pin. The first CC pin and the second CC pin of the wireless charging control chip serve as the CC terminals of the wireless charging output module and are connected to the CC terminals of the PD fast charging power supply.
4. The wireless charging circuit according to claim 3, characterized in that, The wireless charging control module also includes an input protection unit and an output filtering unit. The input protection unit is located at the power input terminal of the wireless charging control module and is connected to the PD fast charging power supply. The output filtering unit is located at the power output terminal of the wireless charging control module and is connected to the wireless charging output module.
5. The wireless charging circuit according to claim 4, characterized in that, The input protection unit includes a protection diode, the negative terminal of which is connected to the PD fast charging power supply, and the negative terminal of which is connected to the voltage input pin of the wireless charging control chip.
6. The wireless charging circuit according to claim 5, characterized in that, The output filtering unit includes multiple filtering capacitors connected in parallel.
7. The wireless charging circuit according to claim 4, characterized in that, The wireless charging control module also includes a common-mode inductor, one end of which is connected to the input protection unit, and the other end of which is connected to the output filtering unit.
8. The wireless charging circuit according to claim 4, characterized in that, The wireless charging output module is a wireless charging output coil.
9. A wireless charger, characterized in that, It includes a housing and a circuit board, the circuit board being disposed within the housing, and the circuit board having a wireless charging circuit as described in any one of claims 1-8.
10. The wireless charger according to claim 9, characterized in that, The housing is provided with a clearance hole, and the wireless charging output module is exposed on the outer surface of the housing and is connected to the circuit board wires through the clearance hole.