Wireless charging transmitting circuit, chip and electronic equipment

Abstract

The invention provides a wireless charging transmitting circuit, a chip and electronic equipment. The wireless charging transmitting circuit comprises an energy storage module and an inversion module. The energy storage module can transmit the stored electric energy to the inversion module, so that the inversion module can obtain the electric energy. Power tubes and capacitors in the energy storage module and the inversion module form a boost conversion circuit. Therefore, under the action of electric energy, the inverter module can utilize the formed boost conversion circuit to increase the voltage on the capacitor in the inverter module, so that the voltage on the capacitor is greater than the input voltage. Therefore, the electric energy output by the inverter module can be increased. Furthermore, on the basis that a boost conversion circuit does not need to be independently added, the electric energy output by the inverter module can be increased, and the transmission power of the wireless charging transmitting circuit is improved. Therefore, the cost of the wireless charging transmitting circuit can be reduced, and the transmission power of the wireless charging transmitting circuit can be improved.

Description

Technical Field

[0001] The present application relates to the field of wireless charging technology, and in particular to a wireless charging transmitting circuit, chip and electronic device. Background Art

[0002] The principle of wireless charging technology is to achieve wireless transmission of electric energy through electromagnetic field coupling between the transmitting coil in the transmitter end (TX) circuit and the receiving coil in the receiver end (RX) circuit. Since the amount of electric energy that the transmitting coil can transmit is related to the input voltage of the TX circuit, it is impossible to transmit high-power electric energy when the input voltage is low. Therefore, a boost converter is usually added to the front stage of the inverter in the TX circuit to increase the input voltage, so as to increase the electric energy transmitted by the transmitting coil and increase the transmission power of the TX circuit. However, by adding a boost converter, the cost of the TX circuit will increase. Summary of the invention

[0003] The present application provides a wireless charging transmitting circuit, chip and electronic device, which can reduce costs and improve transmission power.

[0004] In a first aspect, the present application provides a wireless charging transmitting circuit, which includes: an energy storage module and an inverter module.

[0005] The energy storage module is electrically connected to the inverter module, wherein the power tubes and capacitors in the energy storage module and the inverter module form a boost conversion circuit.

[0006] The energy storage module is used to transmit the stored electric energy to the inverter module.

[0007] The inverter module is used to increase the voltage on the capacitor in the inverter module by using the constructed boost conversion circuit under the action of electric energy, so as to increase the electric energy output by the inverter module.

[0008] Through the wireless charging transmitting circuit provided by the first aspect, the energy storage module can transmit the stored electric energy to the inverter module, so that the inverter module can obtain electric energy. Since the energy storage module and the power tube and capacitor in the inverter module constitute a boost conversion circuit. Therefore, under the action of electric energy, the inverter module can use the constituted boost conversion circuit to increase the voltage on the capacitor in the inverter module so that the voltage on the capacitor is greater than the input voltage. In this way, the electric energy output by the inverter module can be increased. Furthermore, without the need to separately add a boost conversion circuit, the electric energy output by the inverter module can be increased, and the transmission power of the wireless charging transmitting circuit can be improved. Thereby, the cost of the wireless charging transmitting circuit can be reduced, and the transmission power of the wireless charging transmitting circuit can be improved.

[0009] In one possible design, the inverter module includes a full-bridge inverter, a first capacitor and a second capacitor, and the full-bridge inverter includes: a first power tube, a second power tube, a third power tube and a fourth power tube.

[0010] The first end of the first power tube and the second end of the third power tube are both electrically connected to the first end of the energy storage module, the first end of the third power tube is electrically connected to the first end of the first capacitor, the second end of the second capacitor is electrically connected to the first end of the fourth power tube, the first end of the second power tube and the second end of the fourth power tube are both electrically connected to the second end of the energy storage module, the second end of the first power tube, the second end of the second power tube, the second end of the first capacitor and the first end of the second capacitor are all grounded, and the control end of the first power tube, the control end of the second power tube, the control end of the third power tube and the control end of the fourth power tube are all used to access the control signal, and the control signal is used to control the conduction or shutdown of the power tube.

[0011] In a possible design, the energy storage module includes: a first inductor and a second inductor.

[0012] The first end of the first inductor is electrically connected to the first end of the first power tube, the first end of the second inductor is electrically connected to the first end of the second power tube, and the second end of the first inductor and the second end of the second inductor are both used to access the input voltage.

[0013] In a possible design, the inverter module includes a half-bridge inverter and a first capacitor, and the half-bridge inverter includes: a first power tube and a second power tube.

[0014] The first end of the first power tube and the second end of the second power tube are both electrically connected to the first end of the energy storage module, the first end of the second power tube is electrically connected to the first end of the first capacitor, the second end of the first power tube and the second end of the second capacitor are both grounded, and the control end of the first power tube and the control end of the second power tube are both used to access a control signal, and the control signal is used to control the conduction or shutdown of the power tube.

[0015] In a possible design, the energy storage module includes: a first inductor.

[0016] The first end of the first inductor is electrically connected to the first end of the first power tube, and the second end of the first inductor is used to access the input voltage.

[0017] In one possible design, the method for adjusting the transmission power of the wireless charging transmitting circuit includes: adjusting the duty cycle of the control signal and the switching frequency of the power tube, and the control signal is used to control the conduction or shutdown of the power tube in the inverter module.

[0018] In a possible design, the wireless charging transmitting circuit also includes: a transmitting module.

[0019] The transmitting module is electrically connected to the inverter module.

[0020] The transmitting module is used to obtain the voltage on the capacitor from the inverter module, and output a wireless charging signal under the action of the voltage on the capacitor.

[0021] In a possible design, the transmitting module includes: a transmitting coil and a resonant capacitor.

[0022] The first end of the resonant capacitor is electrically connected to the first end of the inverter module, the second end of the resonant capacitor is electrically connected to the first end of the transmitting coil, and the second end of the transmitting coil is electrically connected to the second end of the inverter module.

[0023] In a second aspect, the present application provides a chip, comprising: the wireless charging transmitting circuit in the above-mentioned first aspect and any possible design of the first aspect.

[0024] The beneficial effects of the chip provided in the above-mentioned second aspect and each possible design of the above-mentioned second aspect can be referred to the beneficial effects brought about by the above-mentioned first aspect and each possible implementation method of the first aspect, and will not be repeated here.

[0025] In a third aspect, the present application provides an electronic device, comprising: the chip in the above-mentioned second aspect and any possible design of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a wireless charging transmitting circuit provided for related technologies;

[0027] Figure 2 A schematic diagram of a transmission power trend of a wireless charging transmitting circuit provided for related technologies;

[0028] Figure 3 Another schematic diagram of the transmission power trend of a wireless charging transmitting circuit provided for related technology;

[0029] Figure 4 A schematic diagram of the structure of another wireless charging transmitting circuit provided for related technology;

[0030] Figure 5 A schematic diagram of the structure of a wireless charging transmission circuit provided in one embodiment of the present application;

[0031] Figure 6 A schematic diagram of a working waveform of a wireless charging transmitting circuit provided in one embodiment of the present application;

[0032] Figure 7 A schematic diagram of the structure of another wireless charging transmitting circuit provided in an embodiment of the present application;

[0033] Figure 8A schematic diagram of operating waveforms of another wireless charging transmitting circuit provided in an embodiment of the present application;

[0034] Fig. 9 A schematic diagram of a transmission power trend of a wireless charging transmitting circuit provided in an embodiment of the present application;

[0035] Fig.10 Another schematic diagram of a transmission power trend of a wireless charging transmitting circuit provided in an embodiment of the present application;

[0036] Fig.11 A schematic diagram of a transmission power trend of another wireless charging transmitting circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0039] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Reference Figure 1 , Figure 1 A schematic diagram of a wireless charging transmission circuit provided for related technologies. Figure 1 As shown, in the TX circuit, the class-D amplifier composed of power tubes K1-K4, i.e., the class-D structure, is used as an emitter. In this way, the class-D structure can convert the DC input voltage VIN1 into an AC voltage. Then, the AC voltage is transmitted to the RX circuit through the resonant circuit composed of the transmitting coil LP1 and the resonant capacitor CS.

[0041] When the class-D structure is working, the power tubes K1 and K4 are in one phase, and the power tubes K2 and K3 are in another phase, and the two phases are turned on alternately.

[0042] Generally, the way to adjust the transmission power of the wireless charging transmitting circuit includes: adjusting the resonant frequency, adjusting the duty cycle, adjusting the phase and adjusting the input voltage VIN1.

[0043] Reference Figure 2 , Figure 2 Shows Figure 1 A schematic diagram showing the trend of the transmission power of the wireless charging transmitter circuit. Figure 2 As shown, at the resonant frequency point f'0, the transmission power POUT1 of the wireless charging transmitting circuit is the maximum, that is, POUT1 is P'max. Usually under the wireless charging protocol Qi, the range of resonant frequency adjustment is greater than the resonant frequency point f'0, that is Figure 2 f'1-f'2 in.

[0044] Generally, when the duty cycle is 50%, the transmission power POUT1 of the wireless charging transmitting circuit is maximum.

[0045] Reference Figure 3 , Figure 3 Shows Figure 1 Another schematic diagram showing the transmission power trend of the wireless charging transmitter circuit. Figure 3As shown, as the input voltage VIN1 increases, the transmission power POUT1 of the wireless charging transmitting circuit increases.

[0046] Based on the above description, it can be known that the amount of power transmitted by the transmitting coil LP1 is related to the input voltage VIN1, so that when the input voltage VIN1 is low, the transmitting coil LP1 cannot transmit high-power power. Therefore, a boost converter is usually added to the front stage of the class-D structure in the TX circuit to increase the input voltage VIN1.

[0047] Reference Figure 4 , Figure 4 A schematic diagram of another wireless charging transmitting circuit provided in the related art. Figure 4 As shown, a boost converter is added to the front stage of the class-D structure to increase the input voltage of the class-D structure, thereby increasing the power transmitted by the transmitting coil.

[0048] The boost converter boost may include an upper tube QH, a lower tube QL, an inductor L' and a capacitor.

[0049] Usually, the boost converter is independent of the original TX circuit, that is, a new boost converter is added, or the transistor MOS outside the original TX circuit is controlled by the original TX circuit with a boost function. However, both methods will increase the cost of the TX circuit.

[0050] To this end, the present application provides a wireless charging transmitting circuit, chip and electronic device.

[0051] The wireless charging transmitting circuit 100 may be a chip or a circuit module.

[0052] The wireless charging transmitting circuit 100 of the embodiment of the present application can be applied to various electronic devices such as smart phones, tablet computers, power tools and drones.

[0053] Reference Figure 5 , Figure 5 This is a schematic diagram of the structure of a wireless charging transmission circuit provided by an embodiment of the present application. Figure 5 As shown, the wireless charging transmitting circuit 100 may include: an energy storage module 110 and an inverter module 120 .

[0054] The energy storage module 110 and the inverter module 120 may be arranged separately or integrated.

[0055] The energy storage module 110 is electrically connected to the inverter module 120 .

[0056] The energy storage module 110 can transmit the stored electric energy to the inverter module 120 so that the inverter module 120 can obtain electric energy.

[0057] Since the power tube and capacitor in the energy storage module 110 and the inverter module 120 constitute a boost conversion circuit. Therefore, under the action of electric energy, the inverter module 120 can use the constituted boost conversion circuit to increase the voltage on the capacitor in the inverter module 120, so that the voltage on the capacitor is greater than the input voltage VIN2. In this way, the electric energy output by the inverter module 120 can be increased, so that the electric energy obtained by the transmitting module 130 from the inverter module 120 is increased. Furthermore, without the need to add a boost conversion circuit separately, the electric energy output by the inverter module 120 can be increased, and the transmission power of the wireless charging transmitting circuit 100 can be improved. Thereby, the cost of the wireless charging transmitting circuit 100 can be reduced, and the transmission power of the wireless charging transmitting circuit 100 can be improved.

[0058] The wireless charging transmitting circuit, chip and electronic device provided by the present application, the energy storage module can transfer the stored electric energy to the inverter module, so that the inverter module can obtain electric energy. Since the energy storage module and the power tube and capacitor in the inverter module constitute a boost conversion circuit. Therefore, under the action of electric energy, the inverter module can use the constituted boost conversion circuit to increase the voltage on the capacitor in the inverter module, so that the voltage on the capacitor is greater than the input voltage. In this way, the electric energy output by the inverter module can be increased. Furthermore, without the need to add a boost conversion circuit separately, the electric energy output by the inverter module can be increased, and the transmission power of the wireless charging transmitting circuit can be improved. Thereby, the cost of the wireless charging transmitting circuit can be reduced, and the transmission power of the wireless charging transmitting circuit can be improved.

[0059] Based on the description of the above embodiment, a possible implementation of the inverter module 120 is exemplified. Figure 5 As shown, the inverter module 120 may include: a full-bridge inverter, a first capacitor C1 and a second capacitor C2. The full-bridge inverter may include: a first power tube Q1, a second power tube Q2, a third power tube Q3 and a fourth power tube Q4.

[0060] The first end of the first power tube Q1 and the second end of the third power tube Q3 are both electrically connected to the first end of the energy storage module 110, the first end of the third power tube Q3 is electrically connected to the first end of the first capacitor C1, the second end of the second capacitor C2 is electrically connected to the first end of the fourth power tube Q4, the first end of the second power tube Q2 and the second end of the fourth power tube Q4 are both electrically connected to the second end of the energy storage module 110, the second end of the first power tube Q1, the second end of the second power tube Q2, the second end of the first capacitor C1 and the first end of the second capacitor C2 are all grounded, and the control end of the first power tube Q1, the control end of the second power tube Q2, the control end of the third power tube Q3 and the control end of the fourth power tube Q4 are all used to access the control signal.

[0061] The control signal is used to control the on or off of the power tube.

[0062] The first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 may form a class-D structure, ie, a full-bridge inverter.

[0063] The first power tube Q1 , the second power tube Q2 , the third power tube Q3 and the fourth power tube Q4 may include but are not limited to gallium nitride transistors, insulated gate bipolar transistors and metal-oxide semiconductor field effect transistors.

[0064] For example, when the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 are gallium nitride transistors, the control end of the first power tube Q1, the control end of the second power tube Q2, the control end of the third power tube Q3 and the control end of the fourth power tube Q4 refer to the gate of the gallium nitride transistor, the first end of the first power tube Q1, the first end of the second power tube Q2, the first end of the third power tube Q3 and the first end of the fourth power tube Q4 may be the drain or source of the gallium nitride transistor, and correspondingly, the second end of the first power tube Q1, the second end of the second power tube Q2, the second end of the third power tube Q3 and the second end of the fourth power tube Q4 may be the source or drain of the gallium nitride transistor.

[0065] For example, when the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 are metal-oxide semiconductor field effect transistors, the control end of the first power tube Q1, the control end of the second power tube Q2, the control end of the third power tube Q3 and the control end of the fourth power tube Q4 refer to the gate of the metal-oxide semiconductor field effect transistor, and the first end of the first power tube Q1, the first end of the second power tube Q2, the first end of the third power tube Q3 and the first end of the fourth power tube Q4 can be the drain or source of the metal-oxide semiconductor field effect transistor, and correspondingly, the second end of the first power tube Q1, the second end of the second power tube Q2, the second end of the third power tube Q3 and the second end of the fourth power tube Q4 can be the source or drain of the metal-oxide semiconductor field effect transistor.

[0066] For example, when the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 are field-controlled thyristors, the control end of the first power tube Q1, the control end of the second power tube Q2, the control end of the third power tube Q3 and the control end of the fourth power tube Q4 refer to the gate of the field-controlled thyristor, and the first end of the first power tube Q1, the first end of the second power tube Q2, the first end of the third power tube Q3 and the first end of the fourth power tube Q4 can be the drain or source of the field-controlled thyristor, and correspondingly, the second end of the first power tube Q1, the second end of the second power tube Q2, the second end of the third power tube Q3 and the second end of the fourth power tube Q4 can be the source or drain of the field-controlled thyristor.

[0067] Based on the description of the above embodiment, a possible implementation of the energy storage module 110 is exemplified. Figure 5 As shown, the energy storage module 110 may include: a first inductor L1 and a second inductor L2.

[0068] The first end of the first inductor L1 is electrically connected to the first end of the first power tube Q1, the first end of the second inductor L2 is electrically connected to the first end of the second power tube Q2, and the second ends of the first inductor L1 and the second inductor L2 are both used to access the input voltage VIN2.

[0069] Among them, the first inductor L1, the first power tube Q1, the third power tube Q3 and the first capacitor C1 can form a boost conversion circuit, so that the voltage on the first capacitor C1, that is, the output voltage VOUT1 of this boost conversion circuit is greater than the input voltage VIN2. The first power tube Q1 is the lower tube in the boost conversion circuit, and the third power tube Q3 is the upper tube in the boost conversion circuit. Similarly, the second inductor L2, the second power tube Q2, the fourth power tube Q4 and the second capacitor C2 can form another boost conversion circuit, so that the voltage on the second capacitor C2, that is, the output voltage VOUT2 of this boost conversion circuit is greater than the input voltage VIN2. The second power tube Q2 is the lower tube in the boost conversion circuit, and the fourth power tube Q4 is the upper tube in the boost conversion circuit.

[0070] Combine the following Figure 6 , Figure 6 Shows Figure 5 The working waveform diagram of the wireless charging transmitting circuit is shown in FIG. 1 , and the working principle of the wireless charging transmitting circuit 100 is introduced in detail.

[0071] During the 0-T0 period, the second power tube Q2 and the third power tube Q3 are turned on, so that the voltage of the first end SW2 of the second power tube Q2 is zero, and the voltage of the first end SW1 of the first power tube Q1 is the output voltage VOUT1, so that the first inductor L1 is discharged, that is, demagnetized, so that the current IL1 of the first inductor L1 gradually decreases, and the second inductor L2 is charged, that is, excited, so that the current IL2 of the second inductor L2 gradually increases. In this way, the first inductor L1 charges the first capacitor C1 and transmits electric energy to the transmitting module 130, so that the current flows to the ground through the transmitting module 120 and the second power tube Q2. Since the voltage output by the inverter module 120 is the output voltage VOUT1, and the output voltage VOUT1 exceeds the input voltage VIN2. Therefore, the electric energy output by the inverter module 120 is higher than the electric energy output by the inverter module 120 under the input voltage VIN2. During this period, the first capacitor C1 is first in a charging state and then in a discharging state. That is, when the first capacitor C1 is in a discharging state, the first capacitor C1 transmits electric energy to the transmitting module 130 through the third power tube Q3.

[0072] During the T0-T1 period, the first power tube Q1 and the fourth power tube Q4 are turned on, the voltage of the first end SW1 of the first power tube Q1 is 0, and the voltage of the first end SW2 of the second power tube Q2 is the output voltage VOUT2, so that the first inductor L1 is excited so that the current IL1 of the first inductor L1 gradually increases, and the second inductor L2 is demagnetized so that the current IL2 of the second inductor L2 gradually decreases. In this way, the second inductor L2 charges the second capacitor C2 and transmits electric energy to the transmitting module 130, so that the current flows to the ground through the transmitting module 120 and the first power tube Q1. Since the voltage output by the inverter module 120 is the output voltage VOUT2, and the output voltage VOUT2 exceeds the input voltage VIN2. Therefore, the electric energy output by the inverter module 120 is higher than the electric energy output by the inverter module 120 under the input voltage VIN2. During this period, the second capacitor C2 is first in a charging state and then in a discharging state. That is, when the second capacitor C2 is in a discharging state, the second capacitor C2 transmits electrical energy to the transmitting module 130 through the fourth power tube Q4.

[0073] In the time period T1-T2 and the time period T3-T4, the working principle of the wireless charging transmitting circuit 100 is similar to the working principle in the time period 0-T0, and will not be described in detail here.

[0074] In the time periods T2-T3 and T4-T5, the working principle of the wireless charging transmitting circuit 100 is similar to the working principle in the time period T0-T1, and will not be described in detail here.

[0075] Based on the description of the above embodiment, another possible implementation of the inverter module 120 is exemplified. Figure 7 , Figure 7 This is a schematic diagram of the structure of another wireless charging transmission circuit provided in one embodiment of the present application. Figure 7 As shown, the inverter module 120 may include: a half-bridge inverter and a first capacitor C1. The half-bridge inverter may include: a first power tube Q1 and a second power tube Q2.

[0076] The first end of the first power tube Q1 and the second end of the second power tube Q2 are both electrically connected to the first end of the energy storage module 110, the first end of the second power tube Q2 is electrically connected to the first end of the first capacitor C1, the second end of the first power tube Q1 and the second end of the second capacitor C2 are both grounded, and the control end of the first power tube Q1 and the control end of the second power tube Q2 are both used to access the control signal.

[0077] The control signal is used to control the on or off of the power tube.

[0078] The first power tube Q1 and the second power tube Q2 may form a half-bridge inverter.

[0079] The first power transistor Q1 and the second power transistor Q2 may include but are not limited to gallium nitride transistors, insulated gate bipolar transistors and metal-oxide semiconductor field effect transistors.

[0080] For example, when the first power tube Q1 and the second power tube Q2 are gallium nitride transistors, the control end of the first power tube Q1 and the control end of the second power tube Q2 refer to the gate of the gallium nitride transistor, the first end of the first power tube Q1 and the first end of the second power tube Q2 can be the drain or source of the gallium nitride transistor, and correspondingly, the second end of the first power tube Q1 and the second end of the second power tube Q2 can be the source or drain of the gallium nitride transistor.

[0081] For example, when the first power tube Q1 and the second power tube Q2 are metal-oxide semiconductor field effect transistors, the control end of the first power tube Q1 and the control end of the second power tube Q2 refer to the gate of the metal-oxide semiconductor field effect transistor, the first end of the first power tube Q1 and the first end of the second power tube Q2 can be the drain or source of the metal-oxide semiconductor field effect transistor, and correspondingly, the second end of the first power tube Q1 and the second end of the second power tube Q2 can be the source or drain of the metal-oxide semiconductor field effect transistor.

[0082] For example, when the first power tube Q1 and the second power tube Q2 are field-controlled thyristors, the control end of the first power tube Q1 and the control end of the second power tube Q2 refer to the gate of the field-controlled thyristor, the first end of the first power tube Q1 and the first end of the second power tube Q2 can be the drain or source of the field-controlled thyristor, and correspondingly, the second end of the first power tube Q1 and the second end of the second power tube Q2 can be the source or drain of the field-controlled thyristor.

[0083] Based on the description of the above embodiment, another possible implementation of the energy storage module 110 is exemplified. Figure 7 As shown, the energy storage module 110 may include: a first inductor L1.

[0084] The first end of the first inductor L1 is electrically connected to the first end of the first power tube Q1 , and the second end of the first inductor L1 is used to access the input voltage VIN2 .

[0085] The first inductor L1, the first power tube Q1, the second power tube Q2 and the first capacitor C1 can form a boost converter circuit, so that the voltage on the first capacitor C1, that is, the output voltage VOUT3 of the boost converter circuit is greater than the input voltage VIN2. The first power tube Q1 is the lower tube in the boost converter circuit, and the second power tube Q2 is the upper tube in the boost converter circuit.

[0086] Combine the following Figure 8 , Figure 8 Shows Figure 7The working waveform diagram of the wireless charging transmitting circuit is shown in FIG. 1 , and the working principle of the wireless charging transmitting circuit 100 is introduced in detail.

[0087] In the 0-T0 period, the T1-T2 period and the T3-T4 period, the working principle of the wireless charging transmitting circuit 100 is the same as Figure 6 The working principle of the wireless charging transmitting circuit 100 in the period 0-T0 is similar and will not be described in detail here.

[0088] During the T0-T1 period, the T2-T3 period and the T4-T5 period, the working principle of the wireless charging transmitting circuit 100 is the same as Figure 6 The working principle of the wireless charging transmitting circuit 100 in the T0-T1 period is similar and will not be described in detail here.

[0089] Compared with the full-bridge inverter, although the transmission power of the wireless charging transmitting circuit 100 is smaller, the cost of the inverter module 120 is reduced by removing two power tubes, thereby reducing the cost of the wireless charging transmitting circuit 100.

[0090] In some examples, the method for adjusting the transmission power of the wireless charging transmitting circuit 100 includes: adjusting the duty cycle of the control signal and the switching frequency of the power tube.

[0091] The control signal is used to control the on or off of the power tube in the inverter module 120 .

[0092] Based on the description of the above embodiment, a possible implementation of the transmitting module 130 is exemplified. Figure 5 and Figure 7 As shown, the wireless charging transmitting circuit 100 may further include: a transmitting module 130 .

[0093] The transmitting module 130 is electrically connected to the inverter module 120 .

[0094] In some examples, the transmitting module 130 may include: a transmitting coil LP2 and a resonant capacitor CS2.

[0095] A first end of the resonant capacitor CS2 is electrically connected to a first end of the inverter module 120 , a second end of the resonant capacitor CS2 is electrically connected to a first end of the transmitting coil LP2 , and a second end of the transmitting coil LP2 is electrically connected to a second end of the inverter module 120 .

[0096] Through the transmitting coil LP2 and the resonant capacitor CS2, the voltage on the capacitor can be obtained from the inverter module 120. Moreover, under the action of the voltage on the capacitor, the transmitting coil LP2 can generate a wireless charging signal, so that the transmitting module 130 can output the wireless charging signal. Thus, the transmitting module 130 can obtain the voltage on the capacitor from the inverter module 120, and under the action of the voltage on the capacitor, output the wireless charging signal.

[0097] In the case where the inverter module 120 is a full-bridge inverter or a half-bridge inverter, refer to Fig. 9 , Fig. 9 Shows Figure 5 and Figure 7 A schematic diagram showing the trend of the transmission power of the wireless charging transmitter circuit. Fig. 9 As shown, when the switching frequency is equal to the resonant frequency, the transmission power POUT2 of the wireless charging transmitting circuit 100 is maximum.

[0098] The resonant frequency f0 can be expressed by formula (1):

[0099]

[0100] Wherein, f'0 is the resonant frequency, lp is the inductance of the transmitting coil LP2, and cs is the capacitance of the resonant capacitor CS2.

[0101] Reference Fig.10 , Fig.10 Shows Figure 5 Another schematic diagram showing the transmission power trend of the wireless charging transmitter circuit. Fig.10 As shown, when the inverter module 120 is a full-bridge inverter or a half-bridge inverter, when the duty cycle is 50%, since the output voltage of the boost converter circuit is, for example, twice the input voltage VIN, the wireless charging transmitter circuit 100 in the embodiment of the present application can have a higher transmission power compared to the wireless charging transmitter circuit in the related art.

[0102] When the duty cycle is not 50%, the output voltage of one of the two boost converter circuits in the wireless charging transmitting circuit 100 will always be higher. Thus, the wireless charging transmitting circuit 100 can obtain a greater transmission power.

[0103] Reference Fig.11 , Fig.11 Shows Figure 7 Another schematic diagram showing the transmission power trend of the wireless charging transmitter circuit. Fig.11 As shown, when the inverter module 120 is a half-bridge inverter, as the duty cycle increases, the output voltage of the boost converter circuit becomes higher. Thus, the transmission power of the wireless charging transmitter circuit 100 becomes larger and larger.

[0104] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wireless charging transmitting circuit, characterized in that: include: Energy storage modules and inverter modules; The energy storage module is electrically connected to the inverter module, wherein the energy storage module and the power tube and capacitor in the inverter module form a boost conversion circuit; The energy storage module is used to transmit the stored electric energy to the inverter module; The inverter module is used to increase the voltage on the capacitor in the inverter module by utilizing the constructed boost conversion circuit under the action of the electric energy, so as to increase the electric energy output by the inverter module.

2. The circuit according to claim 1, characterized in that The inverter module includes a full-bridge inverter, a first capacitor and a second capacitor, and the full-bridge inverter includes: a first power tube, a second power tube, a third power tube and a fourth power tube; The first end of the first power tube and the second end of the third power tube are both electrically connected to the first end of the energy storage module, the first end of the third power tube is electrically connected to the first end of the first capacitor, the second end of the second capacitor is electrically connected to the first end of the fourth power tube, the first end of the second power tube and the second end of the fourth power tube are both electrically connected to the second end of the energy storage module, the second end of the first power tube, the second end of the second power tube, the second end of the first capacitor and the first end of the second capacitor are all grounded, and the control end of the first power tube, the control end of the second power tube, the control end of the third power tube and the control end of the fourth power tube are all used to access a control signal, and the control signal is used to control the conduction or shutdown of the power tube.

3. The circuit according to claim 2, characterized in that The energy storage module comprises: a first inductor and a second inductor; The first end of the first inductor is electrically connected to the first end of the first power tube, the first end of the second inductor is electrically connected to the first end of the second power tube, and the second end of the first inductor and the second end of the second inductor are both used to access the input voltage.

4. The circuit according to claim 1, characterized in that The inverter module includes a half-bridge inverter and a first capacitor, and the half-bridge inverter includes: a first power tube and a second power tube; The first end of the first power tube and the second end of the second power tube are both electrically connected to the first end of the energy storage module, the first end of the second power tube is electrically connected to the first end of the first capacitor, the second end of the first power tube and the second end of the second capacitor are both grounded, and the control end of the first power tube and the control end of the second power tube are both used to access a control signal, and the control signal is used to control the conduction or shutdown of the power tube.

5. The circuit according to claim 4, characterized in that The energy storage module includes: a first inductor; The first end of the first inductor is electrically connected to the first end of the first power tube, and the second end of the first inductor is used to access the input voltage.

6. The circuit according to any one of claims 1 to 5, characterized in that: The method for adjusting the transmission power of the wireless charging transmitting circuit includes: adjusting the duty cycle of the control signal and the switching frequency of the power tube, and the control signal is used to control the conduction or shutdown of the power tube in the inverter module.

7. The circuit according to claim 6, characterized in that The wireless charging transmitting circuit also includes: a transmitting module; The transmitting module is electrically connected to the inverter module; The transmitting module is used to obtain the voltage on the capacitor from the inverter module, and output a wireless charging signal under the action of the voltage on the capacitor.

8. The circuit according to claim 7, characterized in that The transmitting module includes: a transmitting coil and a resonant capacitor; The first end of the resonant capacitor is electrically connected to the first end of the inverter module, the second end of the resonant capacitor is electrically connected to the first end of the transmitting coil, and the second end of the transmitting coil is electrically connected to the second end of the inverter module.

9. A chip, characterized in that: include: The wireless charging transmitting circuit according to any one of claims 1 to 8.

10. An electronic device, characterized in that: include: The chip as claimed in claim 9.

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