Double pulse test circuit and method of flying capacitor three-level DCDC power component

A flying capacitor and power component technology, applied in the pulse test circuit field of flying capacitor three-level DCDC power components, can solve the problem that the double-pulse test method cannot be directly applied to flying capacitor three-level power components, etc. Effectiveness of Reliable and Effective Test Methods

Active Publication Date: 2019-02-22
NARI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional double-pulse test method for two-level DCDC power components cannot be directly applied to flying-capacitor three-level power c

Method used

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  • Double pulse test circuit and method of flying capacitor three-level DCDC power component
  • Double pulse test circuit and method of flying capacitor three-level DCDC power component
  • Double pulse test circuit and method of flying capacitor three-level DCDC power component

Examples

Experimental program
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Effect test

Embodiment 1

[0053] refer to figure 1 As shown, the double-pulse test circuit of the flying capacitor three-level DC / DC power component of this embodiment includes a three-level power module, an adjustable DC source DC, a discharge branch and a freewheeling inductance L;

[0054] The three-level power module includes the flying capacitor C fly , DC support capacitor C in , Snubber capacitance C s and a switch conversion circuit; the switch conversion circuit includes a first IGBT switch tube Q1, a second IGBT switch tube Q2, a third IGBT switch tube Q3, and a fourth IGBT switch tube Q4 connected in series in the same direction; the emitters of each IGBT and The freewheeling diodes D1-D4 are respectively reversely connected to the collectors; one end of the flying capacitor C is connected between the first IGBT emitter and the second IGBT collector, and the other end is connected between the third IGBT emitter and the fourth IGBT between IGBT collectors;

[0055] The first IGBT, the sec...

Embodiment 2

[0066] Based on the test circuit of Embodiment 1, this embodiment is a test method for a double-pulse test circuit of a flying capacitor three-level DC / DC power component, including:

[0067] Adjust the adjustable DC source DC to charge the support capacitor to the rated voltage V DC , and then charge the flying capacitor to V through the equalizing resistors R1-R4 DC / 2;

[0068] Disconnect the adjustable DC source DC to stop charging;

[0069] Determine the switching transformation form of the three-level power module and the corresponding test object IGBT switch tube;

[0070] According to the switch conversion form, control the IGBT switch tubes other than the test object IGBT switch tube to turn off or normally open;

[0071] Apply double pulses to the IGBT switch tube of the test object;

[0072] Measure the gate-emitter voltage V of the IGBT switch tube of the test object during the application of the double pulse GE , collector-emitter voltage V CE , and the reve...

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Abstract

The invention discloses the pulse test circuit and the method of a flying capacitor three-level DCDC power component. The test circuit comprises a three-level power module, an adjustable direct current source, a discharge branch and a freewheeling inductor. The three-level power module comprises a supporting capacitor, a flying capacitor, an absorbing capacitor, and first to fourth IGBTs which areconnected in series. Each IGBT is connected with a voltage equalizing resistor and a reverse freewheeling diode in parallel. The adjustable direct current source and the discharge branch are connected in parallel with the supporting capacitor, the absorbing capacitor and a switching conversion circuit. When the three-level power module is operated in a Buck work mode, the freewheeling inductor isconnected between the third IGBT and the fourth IGBT in parallel. When the three-level power module is operated in a Boost work mode, the freewheeling inductor is connected between the first IGBT andthe second IGBT which are connected in series in parallel. In the invention, through controlling different switch conversion modes, each IGBT is subjected to a turn-on-turn-off-turn-on-turn-off process, and the ability of the power component to bear overcurrent and turn-on and turn-off characteristics are examined. The stray inductance of a converter circuit and a caused overvoltage condition areanalyzed and a system design is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics applications, in particular to a pulse test circuit and method for a flying capacitor three-level DCDC power component. Background technique [0002] With the development of power electronics technology, DCDC power converters have been widely used in fields including new energy electric vehicle charging and energy storage tram charging systems, and the capacity and voltage level of charging systems are also getting higher and higher. Compared with the traditional two-level converter, the flying capacitor type three-level DCDC converter has the characteristics of high efficiency and high switching frequency. Higher power levels and switching frequencies also mean higher rates of voltage and current change, and the voltage spikes superimposed on the stray inductance in the commutation circuit are added to both ends of the IGBT, which may cause overvoltage damage to the device. Therefore, ...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/327
CPCG01R31/00G01R31/327
Inventor 雷磊郭巍吴维宁石磊田炜孙祖勇陶正华张文波
Owner NARI TECH CO LTD
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