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Wireless charging emitter and control method thereof

A wireless charging and control method technology, applied in the direction of electrical components, circuit devices, etc., can solve the problems of increasing costs, increasing printed circuit boards, etc., and achieve the effect of reducing size and circuit cost

Active Publication Date: 2019-11-15
合肥中科微电子创新中心有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional ZVS technology adopts the Continuous-Conduction Mode (CCM) working mode, which requires a large ZVS inductor and capacitor, which increases the cost and increases the area of ​​the Printed Circuit Board (PCB).

Method used

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  • Wireless charging emitter and control method thereof
  • Wireless charging emitter and control method thereof
  • Wireless charging emitter and control method thereof

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] See figure 1 , figure 1 It is a schematic diagram of the structure of the wireless charging transmitter adopting the traditional CCM working mode, such as figure 1 Shown, L 1 Primary coil (R eq is the load resistance of the receiver equivalent to the primary coil end), the capacitance C 1 with L 1 Form the resonant network of the transmitter. m 1 and M 2 is the power switch of the power amplifier circuit, at the switch node V SW1 The parasitic capacitances at points are C S1 and C S2 , its equivalent total capacitance is C oss . Since the transmitter generally has a higher power supply voltage, the M 1 and M 2 often use DMOS, resulting in C oss Larger capacity. When M 1 and M 2 When the switch is ...

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Abstract

The invention relates to a wireless charging emitter. The wireless charging emitter includes a resonant circuit (201) for generating magnetic field energy, a power amplifier circuit (202) for providing AC power required for generating the magnetic field energy, a zero-voltage switching network (203) including an inductor, a capacitor and a first switch and a second switch, and a zero current detection circuit, wherein the second switch is connected in parallel with the inductor and then connected in series with the first switch and the capacitor to charge and discharge a switch node of the power amplifier circuit (202), and the zero current detection circuit (204) is used for generating a control signal to control switching states of the first switch and the second switch and to detect thecurrent passing through the inductor. The wireless charging emitter is advantaged in that due to the two switches of the zero-voltage switching network (203), the current passing through the inductorchanges from a continuous current to a discontinuous current, sizes of a QVS network inductor and the capacitor are greatly reduced, and circuit cost and the PCB area are reduced.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a wireless charging transmitter and a control method thereof. Background technique [0002] Existing wireless charging transmitters often use D-type power amplifiers. Since there is a large parasitic capacitance in the switching node of the D-type amplifier, a zero-voltage switching (Zero-Voltage Switching, ZVS) technology is required to improve the conversion efficiency. The traditional ZVS technology adopts a continuous-conduction mode (Continuous-Conduction Mode, CCM) operation mode, which requires a large ZVS inductor and capacitor, which increases the cost and increases the area of ​​the printed circuit board (Printed Circuit Board, PCB). Contents of the invention [0003] (1) Technical problems to be solved [0004] In view of the existing technical problems, the present invention proposes a wireless charging transmitter and a control method thereof, which are us...

Claims

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Application Information

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IPC IPC(8): H02J50/12
CPCH02J50/12
Inventor 程林吴枫康一
Owner 合肥中科微电子创新中心有限公司
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