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Soft switching detection circuit of power switching device and switching loss dynamic optimization method

A technology for power switching devices and detection circuits, which is applied in the testing of single semiconductor devices, conversion devices for output power, and measurement of electricity, etc., can solve problems such as large turn-off losses, increased reactive power of converters, and complicated selection of resonant components.

Active Publication Date: 2020-12-25
苏州卡方能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the switching frequency increases, the switching loss of the power device will increase significantly. Therefore, it is necessary to ensure that the power device works in the soft switching state of zero voltage switching (ZVS), so as to reduce the switching loss
Existing studies have shown that the ZVS of power electronic converters can be realized with the help of additional resonant circuits. However, the disadvantage of this method is that the selection of resonant components is more complicated, and the use of resonant components increases the reactive power in the converter.
In recent years, some scholars have proposed that the critical current mode of power electronic converters is the most direct and effective method to realize ZVS. However, this method of realizing ZVS with the help of critical current mode depends on the accurate calculation of component parameters. Once the component parameters deviate, ZVS will also be lost
In addition, when the critical current mode is used to realize ZVS, the turn-on loss of the power switching device can be greatly reduced, but the turn-off loss is still large

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  • Soft switching detection circuit of power switching device and switching loss dynamic optimization method
  • Soft switching detection circuit of power switching device and switching loss dynamic optimization method
  • Soft switching detection circuit of power switching device and switching loss dynamic optimization method

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Embodiment 1

[0032] Embodiment 1: An application embodiment of a soft switching detection circuit of a power switching device in a synchronous buck converter Image 6 As shown, it is the application of the detection circuit proposed by the present invention in the case of low frequency. Image 6 The application example shown includes a DC voltage source, a high-side power switching device S in a half-bridge 1 , the low-side power switching device S in the half-bridge 2 , soft switching detection circuit, output filter inductance (L 1 ), the output filter capacitor C 1 , output load, digital-to-analog converter. The soft switching detection circuit is measured by the capacitance C det , hold capacitor C sp , resistance R det , R 1 , R 2 , Diode D 1 It is composed of a reset switch M, the reset switch M adopts a metal oxide semiconductor field effect transistor, and the middle point of the half bridge is connected to the measuring capacitor C det the input terminal, measure the cap...

Embodiment 2

[0037] Embodiment 2: An application embodiment of a soft switching detection circuit of a power switching device in a full-bridge converter Figure 9 As shown, it is the application of the detection circuit proposed by the present invention in the case of high frequency. Figure 9 The application example shown includes a DC voltage source, a power switching device D 1 ,D 2 ,D 3 and D 4 , Resonant network, digital-to-analog converter, differential isolation amplifier, soft-switching detection circuit. What needs to be detected is the soft switching state of the power switching device in the full-bridge inverter. The resonant network connected to point a and point b of the bridge arm of the full-bridge inverter is an inductive resonant network, and the detection circuit adopts connection method one. The midpoint b of the bridge arm of the full-bridge inverter is connected to the measuring capacitance C of the soft switching detection circuit det the input terminal, measure ...

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Abstract

The invention relates to a soft switching detection circuit of a power switching device and a switching loss dynamic optimization method, and belongs to the field of power electronic converter control. The invention provides the power switching device soft switching detection circuit composed of basic components and the switching loss dynamic optimization method of the power switching device, thesoft switching detection circuit can be used for detecting switching states of power switching devices with low switching frequency and high switching frequency, and meanwhile, the circuit not only can be used for soft switching detection, but also can realize turn-off loss detection. According to the soft switching detection circuit, a converter based on the power switching device can automatically find the optimal switching state under different loads, the soft switching state of the power switching device is guaranteed within the wide load range, the switching-off loss is minimum, meanwhile, only one set of detection circuit is needed, the power density of the converter is improved, and the analog-to-digital conversion channel number of a digital signal processor is reduced.

Description

technical field [0001] The invention belongs to the control field of power electronic converters, and in particular relates to a soft switching detection circuit of a power switching device and a dynamic optimization method for switching loss. The circuit can realize soft switching state detection and dynamic switching loss under the conditions of low switching frequency and high switching frequency optimization. Background technique [0002] As we all know, the power switching device is the core component of the power electronic converter, increasing the switching frequency of the power switching device (such as metal oxide semiconductor field effect transistor) in the converter can reduce the output capacitance and inductance of the power electronic converter, thereby Increase the power density of power electronic converters. However, as the switching frequency increases, the switching loss of the power device will increase significantly. Therefore, it is necessary to ens...

Claims

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Application Information

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IPC IPC(8): G01R31/26G01R31/327H02M1/00
CPCG01R31/2621G01R31/327H02M1/00H02M1/0058Y02B70/10
Inventor 鲁思兆李思奇邓晓婷舒文彬
Owner 苏州卡方能源科技有限公司