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A low voltage stress circuit and wireless charging device

A low-voltage, circuit technology, applied in battery circuit devices, circuit devices, output power conversion devices, etc., can solve the problem of high voltage stress of power devices, and achieve the effect of reducing voltage stress and reducing voltage stress

Active Publication Date: 2020-05-01
柏壹新能源科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the process of implementing the embodiments of the present invention, the inventors found that a traditional Class E power amplifier needs a higher input voltage to output the same power, and the transistor usually reaches 3-5 times the input voltage, resulting in high voltage stress of the power device

Method used

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  • A low voltage stress circuit and wireless charging device
  • A low voltage stress circuit and wireless charging device
  • A low voltage stress circuit and wireless charging device

Examples

Experimental program
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Effect test

Embodiment 1

[0037] figure 2 A schematic structural diagram of a circuit with low voltage stress provided by one embodiment of the present invention. like figure 2 As shown, the low voltage stress circuit 100 of this embodiment includes an inverter circuit 10 and an output circuit 20 , and the inverter circuit 10 is electrically connected to the output circuit 20 .

[0038] The inverter circuit 10 includes a first sub-inverter circuit 11 and a second sub-inverter circuit 12 connected in parallel.

[0039] Wherein, the first sub-inverter circuit 11 includes a first power supply unit 111 , a first inductor 112 , a first transistor 113 and a first harmonic elimination unit 114 . The anode of the first power supply unit 111 is connected to the input terminal of the first inductor 112, the output terminal of the first inductor 112 is connected to the input terminal of the first transistor 113, the output terminal of the first transistor 113 is grounded, and the negative pole of the first po...

Embodiment 2

[0051] Figure 4 A schematic structural diagram of a circuit with low voltage stress provided by another embodiment of the present invention. like Figure 4 As shown, on the basis of the first embodiment, the low voltage stress circuit 100 of this embodiment further includes a first impedance matching circuit 31 and a second impedance matching circuit 32 .

[0052] Wherein, the first impedance matching circuit 31 is connected in parallel with the first harmonic elimination unit 114 , and the second impedance matching circuit 32 is connected in parallel with the second harmonic elimination unit 124 . Specifically, one end of the first impedance matching circuit 31 is connected to the input end of the third inductor 11422, and the other end of the first impedance matching circuit 31 is connected to the output end of the third capacitor 11421; one end of the second impedance matching circuit 32 is connected to the third capacitor 11421. The input end of the four capacitors 1242...

Embodiment 3

[0057] Image 6 A schematic structural diagram of a drive circuit for a circuit with low voltage stress provided by another embodiment of the present invention. like Image 6 As shown, on the basis of the second embodiment, the low voltage stress circuit 100 of this embodiment further includes a driving circuit 40, and the driving circuit 40 is respectively connected to the first transistor 113 and the second transistor 114 for driving the first transistor 113 , The second transistor 114 works.

[0058] Wherein, the drive circuit 20 may be a transformer isolation drive circuit or an optocoupler isolation drive circuit. In this embodiment, the drive circuit 20 is taken as an example for illustration.

[0059] Wherein, the driving circuit 40 includes a main driving unit 41 , a first driving unit 42 , a second driving unit 43 , a main coil 441 , a first auxiliary coil 442 and a second auxiliary coil 443 . The main drive unit 41 is connected with the main coil 441, the first dr...

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Abstract

The embodiment of the present invention relates to the technical field of electric power, and discloses a circuit with low voltage stress and a wireless charging device. The low-voltage stress circuit includes: a first sub-inverter circuit, including a first power supply unit, a first inductor, a first transistor connected in series in sequence, and a first harmonic elimination unit connected in parallel with the first transistor, and the first transistor The output terminal and the negative electrode of the first power supply unit are grounded; the second sub-inverter circuit is connected in parallel with the first sub-inverter circuit, including the second power supply unit, the second transistor, the second inductor connected in series in sequence, and the second transistor connected in parallel The second harmonic elimination unit, the negative electrode of the second power supply unit is grounded; the output circuit is connected in series with the first harmonic elimination unit and the second harmonic elimination unit for outputting alternating current. Through the above methods, this embodiment can effectively reduce the voltage stress of the power device.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a low voltage stress circuit and a wireless charging device. Background technique [0002] In recent years, wireless power transfer technology has developed rapidly. Among them, magnetic field coupling wireless power transfer technology has attracted widespread attention in various fields due to its advantages such as high transmission power, high efficiency, and good safety. [0003] Topology is an important part of wireless power transfer. The topology of the traditional Class E power amplifier has the characteristics of simple structure and high efficiency, and it is usually used as the power stage of the wireless charging transmitter. [0004] like figure 1 Shown is a schematic diagram of the circuit structure of a traditional Class E power amplifier. Among them, the switch on the left represents the transistor working in the switching state, C p is the junction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537H02M1/12H02J7/00H02J50/00
CPCH02J7/025H02M1/126H02M7/537H02J50/00H02M1/123
Inventor 姜翔文李文华
Owner 柏壹新能源科技(深圳)有限公司
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