Wireless charging primary circuit, device and system

Abstract

The present invention discloses a wireless charging primary circuit, device and system, including: a power input module, a square wave signal input module and an output module. The output module includes a first capacitor C1, a first inductor L1, a first N-type switch tube Q1, a second N-type switch tube Q2, a third N-type switch tube Q3, a first P-type switch tube Q4, a second P-type switch tube Q5 and a third P-type switch tube Q6. Wireless power transmission is achieved by interconnecting the above-mentioned switch tubes, capacitors and inductors. There is no need to use a dedicated chip for wireless charging, which can effectively reduce costs.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a wireless charging primary circuit, device and system. Background Art

[0002] At present, wireless charging is increasingly widely used, especially in mobile phones, wearable devices, automobiles, household appliances, medical equipment, etc. In the prior art, wireless charging solutions are usually designed with mature integrated chips, such as Qi-compliant wireless charging chips, which are designed in accordance with Qi standards and requirements. The output voltage error signal is modulated by RX (Receiver) and demodulated by TX (Transmitter) to achieve closed-loop feedback, which can basically achieve the digital power control mode. In addition, the FW (Firmware) is fixed, the technology is mature, and it is widely used in the charging of some smart products, such as mobile phones, wireless headphones, battery packs, etc. However, for some small consumer electronic products or electronic products with low-cost requirements, such as small children's toys and electric toothbrushes, the existing charging solutions use more integrated chips, resulting in higher costs. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a wireless charging primary circuit, which can effectively reduce the cost of the wireless charging device.

[0004] The present invention also provides a wireless charging device having the above-mentioned wireless charging primary circuit.

[0005] The present invention also provides a wireless charging system having the wireless charging device.

[0006] According to the first aspect of the present invention, the wireless charging primary circuit includes: a power input module, a square wave signal input module and an output module, wherein the output module includes a first capacitor C1, a first inductor L1, a first N-type switch tube Q1, a second N-type switch tube Q2, a third N-type switch tube Q3, a first P-type switch tube Q4, a second P-type switch tube Q5 and a third P-type switch tube Q6, wherein the control end of the first N-type switch tube Q1 is connected to the square wave signal input module, the input end of the first N-type switch tube Q1 is connected to the output end of the first P-type switch tube Q4, and the output end is grounded; the control end of the second N-type switch tube Q2 is connected to the output end of the first P-type switch tube Q4, and the output end is grounded; The first N-type switch tube Q1 is connected to the input end, the input end is connected to the output end of the second P-type switch tube Q5, and the output end is grounded; the control end of the third N-type switch tube Q3 is connected to the square wave signal input module, the input end is connected to the output end of the third P-type switch tube Q6, and the output end is grounded; the control end of the first P-type switch tube Q4 is connected to the square wave signal input module, and the input end is connected to the power input module; the control end of the second P-type switch tube Q5 is connected to the input end of the first N-type switch tube Q1, and the control end of the third P-type switch tube Q6 is connected to the square wave signal input module.

[0007] or,

[0008] The control end of the second P-type switch tube Q5 is connected to the input end of the third N-type switch tube Q3, and the control end of the third P-type switch tube Q6 is connected to the input end of the second N-type switch tube Q2; the input ends of the second P-type switch tube Q5 and the third P-type switch tube Q6 are connected to the power input module; one end of the first capacitor C1 is connected to one end of the first inductor L1, and the other end is connected to the output end of the second P-type switch tube Q5, and the other end of the first inductor L1 is connected to the output end of the third P-type switch tube Q6.

[0009] The wireless charging primary circuit according to the embodiment of the present invention has at least the following beneficial effects: when the square wave signal output is at a high level, if the control end of the second P-type switch tube Q5 is connected to the input end of the first N-type switch tube Q1, and the control end of the third P-type switch tube Q6 is connected to the square wave signal input module, at this time, the control ends of the first N-type switch tube Q1 and the third N-type switch tube Q3 are at a high level, and the control end of the second P-type switch tube Q5 is at a low level, so that the first N-type switch tube Q1, the third N-type switch tube Q3 and the second P-type switch tube Q5 are in a conducting state, and the other switch tubes are in a cut-off state. When the square wave signal input module continuously inputs the square wave signal, the resonant circuit composed of the first capacitor C1 and the first inductor L1 obtains a periodic current similar to a sine wave, so that the first inductor L1 can radiate the changing high-frequency magnetic field. The above-mentioned wireless charging primary circuit can realize high-frequency magnetic field radiation without using a wireless charging chip, a full-bridge driver chip, and corresponding software processing, which significantly saves production costs compared with the prior art.

[0010] According to some embodiments of the present invention, the first bleeder resistor R1, the second bleeder resistor R2 and the third bleeder resistor R3 are also included. One end of the first bleeder resistor R1 is connected to the control end of the first P-type switch tube Q4, and the other end is connected to the input end of the first P-type switch tube Q4; one end of the second bleeder resistor R2 is connected to the input end of the second P-type switch tube Q5, and the other end is connected to the output end of the second P-type switch tube Q5; one end of the third bleeder resistor R3 is connected to the input end of the third P-type switch tube Q6, and the other end is connected to the output end of the third P-type switch tube Q6.

[0011] According to some embodiments of the present invention, the power input module includes a connector CN1 and a second capacitor C2, the output end of the connector CN1 is connected to the output module, one end of the second capacitor C2 is connected to the output end of the connector CN1, and the other end of the second capacitor C2 is grounded.

[0012] According to some embodiments of the present invention, the square wave signal input module includes a square wave signal generator, and a signal output end of the square wave signal generator is connected to the output module.

[0013] According to some embodiments of the present invention, the first N-type switch tube Q1, the second N-type switch tube Q2, the third N-type switch tube Q3, the first P-type switch tube Q4, the second P-type switch tube Q5 and the third P-type switch tube Q6 are MOS tubes or triodes.

[0014] A wireless charging device according to an embodiment of the second aspect of the present invention includes the above-mentioned wireless charging primary circuit.

[0015] The wireless charging device according to the embodiment of the present invention has at least the following beneficial effects: since the wireless charging device according to the embodiment of the present invention adopts the above-mentioned wireless charging primary circuit, wireless power transmission can be achieved without using a wireless charging chip, a full-bridge driver chip, and corresponding software processing, which significantly saves production costs and development costs compared to the prior art.

[0016] A wireless charging system according to an embodiment of a third aspect of the present invention comprises the above-mentioned wireless charging device and a wireless charging terminal, wherein the wireless charging terminal comprises a wireless charging receiving circuit.

[0017] The wireless charging system according to the embodiment of the present invention has at least the following beneficial effects: since the wireless charging system according to the embodiment of the present invention adopts the above-mentioned wireless charging device, wireless power transmission can be achieved without using a wireless charging chip, a full-bridge driver chip, and corresponding software processing, which significantly saves production costs and development costs compared to the prior art.

[0018] According to some embodiments of the present invention, the wireless charging receiving circuit includes a second inductor L2, a third capacitor C3 and a rectifier module, one end of the second inductor L2 is connected to the first input end of the rectifier module, and the other end is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is connected to the second input end of the rectifier module.

[0019] According to some embodiments of the present invention, the rectifier module includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the input end of the first diode D1 is connected to the output end of the third diode D3, the output end of the first diode D1 is connected to the output end of the second diode D2, the input end of the second diode D2 is connected to the output end of the fourth diode D4, the input ends of the third diode D3 and the fourth diode D4 are grounded respectively, the third capacitor C3 is connected between the input end of the second diode D2 and the output end of the fourth diode D4, and the second inductor L2 is connected between the input end of the first diode D1 and the output end of the third diode D3.

[0020] According to some embodiments of the present invention, a fourth capacitor C4 is further included, one end of the fourth capacitor C4 is grounded, and the other end of the fourth capacitor C4 is connected to the output end of the second diode D2.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 A circuit diagram of a first embodiment of a wireless charging primary circuit of the present invention;

[0024] Figure 2 A circuit diagram of a second embodiment of a wireless charging primary circuit of the present invention;

[0025] Figure 3 is a schematic diagram of a wireless charging device according to an embodiment of the present invention;

[0026] Figure 4 is a circuit diagram of a first embodiment of a wireless charging system of the present invention;

[0027] Figure 5 is a circuit diagram of a second embodiment of a wireless charging system of the present invention;

[0028] Figure 6 FIG. 4 is a schematic diagram of a wireless charging system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] Reference Figure 1 The embodiment of the present invention provides a wireless charging primary circuit, including: a power input module, a square wave signal input module and an output module, wherein the output module includes a first capacitor C1, a first inductor L1, a first N-type switch tube Q1, a second N-type switch tube Q2, a third N-type switch tube Q3, a first P-type switch tube Q4, a second P-type switch tube Q5 and a third P-type switch tube Q6, wherein the control end of the first N-type switch tube Q1 is connected to the square wave signal input module, the input end is connected to the output end of the first P-type switch tube Q4, and the output end is grounded; the control end of the second N-type switch tube Q2 is connected to the input end of the first N-type switch tube Q1, the input end is connected to the output end of the second P-type switch tube Q5, and the output end is grounded; the control end of the third N-type switch tube Q3 is connected to the input end of the first N-type switch tube Q1, the input end is connected to the output end of the second P-type switch tube Q5, and the output end is grounded; The control end is connected to the square wave signal input module, the input end is connected to the output end of the third P-type switch tube Q6, and the output end is grounded; the control end of the first P-type switch tube Q4 is connected to the square wave signal input module, and the input end is connected to the power input module; the control end of the second P-type switch tube Q5 is connected to the input end of the first N-type switch tube Q1, the control end of the third P-type switch tube Q6 is connected to the square wave signal input module, and the input ends of the second P-type switch tube Q5 and the third P-type switch tube Q6 are connected to the power input module; one end of the first capacitor C1 is connected to one end of the first inductor L1, and the other end is connected to the output end of the second P-type switch tube Q5, and the other end of the first inductor L1 is connected to the output end of the third P-type switch tube Q6.

[0034] When the square wave signal output is at a high level, the control end of the second P-type switch tube Q5 is connected to the input end of the first N-type switch tube Q1, and the control end of the third P-type switch tube Q6 is connected to the square wave signal input module. At this time, the control ends of the first N-type switch tube Q1 and the third N-type switch tube Q3 are at a high level, and the control end of the second P-type switch tube Q5 is at a low level, so that the first N-type switch tube Q1, the third N-type switch tube Q3 and the second P-type switch tube Q5 are in a conducting state, and the other switch tubes are in a cut-off state. In this way, the current passes through the second P-type switch tube The first P-type switch tube Q5, the first capacitor C1, the first inductor L1 and the third N-type switch tube Q3 form a loop; when the square wave signal output is low level, the control end of the first P-type switch tube Q4 and the third P-type switch tube Q6 is low level, and the control end of the second N-type switch tube Q2 is high level, so the first P-type switch tube Q4, the third P-type switch tube Q6 and the second N-type switch tube Q2 are in the on state, and the other switch tubes are in the off state, so that the current passes through the third P-type switch tube Q6, the first inductor L1, the first capacitor C1 and the second N-type switch tube Q2 to form a loop. When the square wave signal input module continuously inputs the square wave signal, the resonant circuit composed of the first capacitor C1 and the first inductor L1 obtains a periodic current similar to a sine wave, so that the first inductor L1 can couple the changing high-frequency magnetic field to the second inductor L2 to realize wireless power transmission. The above-mentioned wireless charging primary circuit can realize wireless power transmission without using a wireless charging chip, a full-bridge driver chip, and corresponding software processing, which significantly saves production costs compared to the prior art.

[0035] Reference Figure 2In some specific embodiments of the present invention, the control end of the second P-type switch tube Q5 is connected to the input end of the third N-type switch tube Q3, and the control end of the third P-type switch tube Q6 is connected to the input end of the second N-type switch tube Q2. When the square wave signal input module input is high level, the control end of the first N-type switch tube Q1 and the third N-type switch tube Q3 is high level, the control end of the second P-type switch tube Q5 is low level, the first N-type switch tube Q1, the third N-type switch tube Q3 and the second P-type switch tube Q5 are turned on, and other switch tubes are turned off, and the current forms a loop through the second P-type switch tube Q5, the first capacitor C1, the first inductor L1 and the third N-type switch tube Q3; when the square wave signal input module input is low level, the control end of the first P-type switch tube Q4 is low level, the control end of the second N-type switch tube Q2 is high level, and the control end of the third P-type switch tube Q6 is low level, the first P-type switch tube Q4, the second N-type switch tube Q2 and the third P-type switch tube Q6 are turned on, and other switch tubes are turned off. At this time, the current forms a loop through the third P-type switch tube Q6, the first inductor L1, the first capacitor C1 and the second N-type switch tube Q2. When the square wave signal input module continuously inputs a square wave signal, the resonant circuit composed of the first capacitor C1 and the first inductor L1 obtains a periodic current similar to a sine wave, so that the first inductor L1 can couple the changing high-frequency magnetic field to the second inductor L2 to achieve wireless power transmission. The above-mentioned wireless charging primary circuit can achieve high-frequency magnetic field radiation without using a wireless charging chip, a full-bridge driver chip, and corresponding software processing, which significantly saves production costs compared to the existing technology.

[0036] In some specific embodiments of the present invention, a first bleeder resistor R1, a second bleeder resistor R2 and a third bleeder resistor R3 are also included. One end of the first bleeder resistor R1 is connected to the control end of the first P-type switch tube Q4, and the other end is connected to the input end of the first P-type switch tube Q4; one end of the second bleeder resistor R2 is connected to the input end of the second P-type switch tube Q5, and the other end is connected to the output end of the second P-type switch tube Q5; one end of the third bleeder resistor R3 is connected to the input end of the third P-type switch tube Q6, and the other end is connected to the output end of the third P-type switch tube Q6.

[0037] In some specific embodiments of the present invention, the power input module includes a connector CN1 and a second capacitor C2, the output end of the connector CN1 is connected to the output module, one end of the second capacitor C2 is connected to the output end of the connector CN1, and the other end is grounded.

[0038] In some specific embodiments of the present invention, the square wave signal input module includes a square wave signal generator, and a signal output end of the square wave signal generator is connected to the output module.

[0039] In some specific embodiments of the present invention, the first N-type switch tube Q1, the second N-type switch tube Q2, the third N-type switch tube Q3, the first P-type switch tube Q4, the second P-type switch tube Q5 and the third P-type switch tube Q6 are MOS tubes or triodes. When the above-mentioned switch tubes are PMOS tubes, the above-mentioned input end is the source, the output end is the drain, and the control end is the gate; when the above-mentioned switch tubes are NMOS tubes, the above-mentioned input end is the drain, the output end is the source, and the control end is the gate.

[0040] Reference Figure 3 The second aspect of the embodiment of the present invention further provides a wireless charging device, including the above-mentioned wireless charging primary circuit. Since the wireless charging device of the embodiment of the present invention adopts the above-mentioned wireless charging primary circuit, it can realize wireless power transmission without using a wireless charging chip, a full-bridge driver chip, and corresponding software processing, which significantly saves production costs compared with the prior art. Under the same output power, since the embodiment of the present invention adopts a simple square wave generator to replace the traditional dedicated chip or the newly developed MCU, DSP solution, the cost is low, the frequency is adjustable, and the design is more flexible; the embodiment of the present invention has no MCU or DSP control, no software, which greatly shortens the product development schedule and reduces the product development cost; there is no conventional Qi communication (modulation, demodulation) or Airefuel Bluetooth communication, and the anti-interference is stronger (if the communication protocol is interfered, the system will be interrupted). Usually all Qi products have inherent abnormal noise due to low-frequency communication. This embodiment has no communication control, which can avoid the above situation. At the same time, since there is no communication protocol, the output ripple is very small, unlike the traditional Qi solution, the output ripple is very large. Although the embodiment of the present invention is an open-loop design, a good load regulation rate can also be obtained if the input voltage is stable.

[0041] Reference Figure 4 , Figure 5 and Figure 6 The third aspect of the embodiment of the present invention further provides a wireless charging system, including the above-mentioned wireless charging device and a wireless charging terminal, wherein the wireless charging terminal includes a wireless charging receiving circuit. Since the wireless charging system of the embodiment of the present invention adopts the above-mentioned wireless charging device, it can realize wireless power transmission without using a wireless charging chip, a full-bridge driver chip, and corresponding software processing, which significantly saves production costs compared with the prior art.

[0042] In some specific embodiments of the present invention, the wireless charging receiving circuit includes a second inductor L2, a third capacitor C3 and a rectifier module, one end of the second inductor L2 is connected to the first input end of the rectifier module, the other end is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is connected to the second input end of the rectifier module. The rectifier module includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the input end of the first diode D1 is connected to the output end of the third diode D3, and the output end is connected to the output end of the second diode D2, the input end of the second diode D2 is connected to the output end of the fourth diode D4, the input ends of the third diode D3 and the fourth diode D4 are grounded respectively, the third capacitor C3 is connected between the input end of the second diode D2 and the output end of the fourth diode D4, and the second inductor L2 is connected between the input end of the first diode D1 and the output end of the third diode D3. It also includes a fourth capacitor C4, one end of the fourth capacitor C4 is grounded, and the other end is connected to the output end of the second diode D2.

[0043] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A wireless charging primary circuit, characterized in that: include: A power input module, a square wave signal input module and an output module, wherein the output module includes a first capacitor C1, a first inductor L1, a first N-type switch tube Q1, a second N-type switch tube Q2, a third N-type switch tube Q3, a first P-type switch tube Q4, a second P-type switch tube Q5 and a third P-type switch tube Q6, wherein the control end of the first N-type switch tube Q1 is connected to the square wave signal input module, the input end of the first N-type switch tube Q1 is connected to the output end of the first P-type switch tube Q4, and the output end is grounded; the control end of the second N-type switch tube Q2 is connected to the first N-type switch tube Q4. The input end of the second P-type switch tube Q1 is connected, the input end is connected to the output end of the second P-type switch tube Q5, and the output end is grounded; the control end of the third N-type switch tube Q3 is connected to the square wave signal input module, the input end is connected to the output end of the third P-type switch tube Q6, and the output end is grounded; the control end of the first P-type switch tube Q4 is connected to the square wave signal input module, and the input end is connected to the power input module; the control end of the second P-type switch tube Q5 is connected to the input end of the first N-type switch tube Q1, and the control end of the third P-type switch tube Q6 is connected to the square wave signal input module, or, The control end of the second P-type switch tube Q5 is connected to the input end of the third N-type switch tube Q3, and the control end of the third P-type switch tube Q6 is connected to the input end of the second N-type switch tube Q2; the input ends of the second P-type switch tube Q5 and the third P-type switch tube Q6 are connected to the power input module; one end of the first capacitor C1 is connected to one end of the first inductor L1, and the other end is connected to the output end of the second P-type switch tube Q5, and the other end of the first inductor L1 is connected to the output end of the third P-type switch tube Q6.

2. The wireless charging primary circuit according to claim 1, characterized in that: It also includes a first bleeder resistor R1, a second bleeder resistor R2 and a third bleeder resistor R3. One end of the first bleeder resistor R1 is connected to the control end of the first P-type switch tube Q4, and the other end is connected to the input end of the first P-type switch tube Q4; one end of the second bleeder resistor R2 is connected to the input end of the second P-type switch tube Q5, and the other end is connected to the output end of the second P-type switch tube Q5; one end of the third bleeder resistor R3 is connected to the input end of the third P-type switch tube Q6, and the other end is connected to the output end of the third P-type switch tube Q6.

3. The wireless charging primary circuit according to claim 1, characterized in that: The power input module includes a connector CN1 and a second capacitor C2. The output end of the connector CN1 is connected to the output module, one end of the second capacitor C2 is connected to the output end of the connector CN1, and the other end of the second capacitor C2 is grounded.

4. The wireless charging primary circuit according to claim 1, characterized in that: The square wave signal input module comprises a square wave signal generator, and a signal output end of the square wave signal generator is connected to the output module.

5. The wireless charging primary circuit according to claim 1, characterized in that: The first N-type switch tube Q1, the second N-type switch tube Q2, the third N-type switch tube Q3, the first P-type switch tube Q4, the second P-type switch tube Q5 and the third P-type switch tube Q6 are MOS tubes or triodes.

6. A wireless charging device, characterized in that: The wireless charging primary circuit comprises the wireless charging primary circuit as described in any one of claims 1 to 5.

7. A wireless charging system, characterized in that: It comprises the wireless charging device and the wireless charging terminal as claimed in claim 6, wherein the wireless charging terminal comprises a wireless charging receiving circuit.

8. The wireless charging system according to claim 7, characterized in that: The wireless charging receiving circuit includes a second inductor L2, a third capacitor C3 and a rectifier module, one end of the second inductor L2 is connected to the first input end of the rectifier module, and the other end is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is connected to the second input end of the rectifier module.

9. The wireless charging system according to claim 8, characterized in that: The rectifier module includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the input end of the first diode D1 is connected to the output end of the third diode D3, the output end of the first diode D1 is connected to the output end of the second diode D2, the input end of the second diode D2 is connected to the output end of the fourth diode D4, the input ends of the third diode D3 and the fourth diode D4 are grounded respectively, the third capacitor C3 is connected between the input end of the second diode D2 and the output end of the fourth diode D4, and the second inductor L2 is connected between the input end of the first diode D1 and the output end of the third diode D3.

10. The wireless charging system according to claim 9, characterized in that: The fourth capacitor C4 is further included. One end of the fourth capacitor C4 is grounded, and the other end of the fourth capacitor C4 is connected to the output end of the second diode D2.

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